Question 1

Is paper defoamer XS-02, a polyether ester defoamer, harmful to the human body? Does it have an impact on the environment?

Accepted Answer

Paper defoamer XS-02 is a low-toxicity, non-irritating, non-hazardous substance with extremely low risk to human health; it is also environmentally friendly, readily biodegradable, and has low toxicity to aquatic organisms.  Detailed Description  Paper defoamer XS-02 (polyether ester defoamer) is a nonionic defoamer primarily composed of polyoxyethylene polyoxypropylene ether tty acid esters. According to the Globally Harmonized System of Classification and Labelling of Chemicals (GHS), this product is not classified as a hazardous substance and does not ll under hazardous chemicals. Under normal use conditions, it poses no significant risk to human health or the environment.  From a human health perspective, the acute toxicity of this product is extremely low &mdash; the oral LD50 for rats is greater than 2000 mg/kg, classified as low toxicity. It is non-irritating to skin and eyes and has no skin sensitization potential. This means that during routine handling, even accidental contact will not cause severe irritation or allergic reactions. However, as a chemical product, it is still recommended to wear protective gloves and goggles during operation to avoid prolonged direct contact.  From an ecological impact perspective, this product has low toxicity to aquatic organisms (fish 96h LC50 greater than 100 mg/L), is not bioaccumulative, and is readily biodegradable, exhibiting good environmental compatibility. This means it will not accumulate in the food chain or cause persistent damage to aquatic ecosystems, fully meeting the environmental requirements of clean production in the modern paper industry.  Technical Parameters  Item Parameter  Hazard Classification Non-hazardous substance  Acute Toxicity (oral, rat) LD50 > 2000 mg/kg (low toxicity)  Skin Corrosion/Irritation Non-irritating  Serious Eye Damage/Eye Irritation Non-irritating  Skin Sensitization Non-sensitizing  Flammability Non-flammable liquid, closed cup flash point > 150 °C  Explosiveness None  Oxidizing Properties None  Aquatic Ecotoxicity LC50 (fish, 96h) > 100 mg/L (low toxicity)  Bioaccumulation Not bioaccumulative  Biodegradability Readily biodegradable  Application Recommendations  Paper defoamer XS-02 is widely used in scenarios such as papermaking pulping black liquor, paper machine white water circulation, coating color, surce sizing, industrial water treatment, and water-based ink/adhesive systems. Its nonionic nature provides excellent compatibility with various anionic and cationic additives in the system, without causing side reactions or precipitation. It achieves ideal defoaming and foam suppression effects at very low addition levels, offering outstanding cost-effectiveness.  Precautions  Operational Protection: Although the product is non-irritating, it is still recommended to wear protective gloves and goggles during operation to avoid direct skin and eye contact, and to thoroughly wash hands after operation.  Ventilation Conditions: Use in well-ventilated areas to avoid the formation of aerosols or sprays.  Storage Requirements: Keep containers tightly closed and store in a cool, dry, and dark place. The recommended storage temperature is 5~35°C, away from heat sources and strong oxidizers.  Spill Handling: In case of spillage, absorb with inert absorbent material and seal for disposal, preventing the spill from entering drains and surce water.  First Aid Measures: If it gets into the eyes, rinse immediately with plenty of water for at least 15 minutes; for skin contact, wash with soap and water; if ingested, do not induce vomiting, rinse the mouth with water and seek medical attention promptly.

Question 2

What should I do if problems occur during the use of papermaking defoamer XS-02, a polyether ester defoamer? How to obtain technical support?

Accepted Answer

When problems arise during the use of papermaking defoamer XS-02, first systematically check the addition method, system conditions, and storage status, then obtain professional technical support through Guoli Chemical's official channels. Common Usage Issues and Troubleshooting Guide During the use of papermaking defoamer XS-02 (polyether ester defoamer), issues such as poor defoaming effect, poor dispersion, or abnormal product appearance may occur. Below is a systematic troubleshooting plan based on product characteristics: 1. Unsatisctory Defoaming/Foam Suppression Effect Improper Addition Amount: XS-02 is a high-efficiency defoamer, characterized by achieving ideal foam control at extremely low addition amounts. Insufficient dosage leads to incomplete defoaming, while excessive dosage may cause over-emulsification or even pinholes. It is recommended to start with a gradient test at 10~50 ppm (relative to total system volume) and gradually optimize to the best economical dosage. Addition Location and Method: The defoamer should be added upstream or in the turbulent zone of the foam generation area, utilizing the system's own agitation for uniform dispersion. Avoid adding a large amount at once; continuous dropwise addition or batch timed quantitative addition is recommended. For batch feeding, it is recommended to add before foam generation to exert foam suppression effect. Effect of System pH: The database shows that the alkali resistance of XS-02 is "average". Its molecular structure contains ester bonds that may hydrolyze under strong alkaline conditions, reducing the effective component content. When used in high-alkali environments such as pulping black liquor (pH≥12), if defoaming ability decreases over time, it may be related to ester bond hydrolysis. It is recommended to increase the addition frequency or dosage in such conditions, or consult Guoli Chemical's technical team to evaluate whether product model adjustment is needed. 2. Poor Dispersion Performance or Precipitation/Stratification System Temperature: The cloud point range of XS-02 is 15~30℃. When the system temperature is close to or exceeds the cloud point, the self-emulsifying dispersion performance of the product in water will decline, which may cause precipitation or fluctuations in defoaming effect. This is normal in high-temperature processes (e.g., pulping black liquor, coating drying section); the product can still function, but if improved dispersion uniformity is needed, the concentration of the addition solution can be appropriately reduced or stirring intensified. Preparation of Addition Solution: It is recommended to pre-dilute XS-02 with system water or process water to a 1%~5% emulsion and add it online, utilizing its good self-emulsifying properties for more uniform dispersion. The diluted solution should be prepared and used immediately to avoid stratification during long-term storage. Compatibility with Other Additives: XS-02 is a nonionic defoamer with good compatibility with anionic and cationic additives as well as sizing agents and strength enhancers. However, in actual use, if multiple additives are added simultaneously without thorough mixing, local high concentrations may cause incompatibility. It is recommended to add each additive separately and leave sufficient mixing time between addition points. 3. Property Changes After Product Storage Storage Temperature: Recommended storage temperature is 5~35℃ (Source: Guoli Chemical Product Database). Low temperature may cause increased viscosity or even turbidity, while high temperature may accelerate ester bond cleavage affecting chemical stability. If the product stratifies or becomes turbid at low temperatures, move the container to a warm environment to naturally return to room temperature and stir well before use. Do not heat directly with open flame or steam. Container Sealing: The product is slightly hygroscopic; prolonged exposure to humid air may introduce moisture, affecting purity and usage effect. Seal the container promptly after use. Shelf Life: The database does not specify the shelf life. It is recommended to follow the batch release report or consult Guoli Chemical for confirmation. Under recommended storage conditions, the unopened original packaging generally has a shelf life of no less than 12 months. Technical Parameters ParameterValue/DescriptionData Source Ionic TypeNonionicGuoli Chemical Product Database AppearanceMilky white to light yellow viscous liquidGuoli Chemical Product Database Active Ingredient Content≥99%Guoli Chemical Product Database HLB Value4~8Guoli Chemical Product Database Cloud Point (1% Aqueous Solution)15~30℃Guoli Chemical Product Database pH Value (1% Aqueous Solution)5.0~8.0Guoli Chemical Product Database Alkali ResistanceAverage, ester bonds may hydrolyze under strong alkaliGuoli Chemical Product Database Density (20℃)0.85~1.05 g/cm³Guoli Chemical Product Database Kinematic Viscosity100~500 mm²/sGuoli Chemical Product Database Flash Point (Closed Cup)>150℃Guoli Chemical Product Database Storage Temperature5~35℃Guoli Chemical Product Database How to Obtain Technical Support If the problem is still not resolved after the above checks, it is recommended to contact Guoli Chemical for professional technical support through the following channels: Contact Sales Manager/Regional Representative: Provide your product batch number (printed on the product packaging drum label). The technical team can trace the quality inspection data of that batch and help analyze whether the problem is related to the product itself. The batch number is the key identifier for tracing the production date and quality inspection report of the product. Call Guoli Chemical's Official Service Hotline: Visit the official website of Haian Guoli Chemical Co., Ltd. to obtain the latest contact information. Technical engineers can provide process diagnosis, addition scheme optimization suggestions, and arrange on-site technical visits if necessary. Provide a Detailed Problem Description: To improve communication efficiency, it is recommended to prepare the following information in advance—Application Section (pulping black liquor/paper machine white water/coating coating, etc.), System pH and Temperature, Current Addition Amount and Method, Frequency and Manifestation of the Problem (e.g., intermittent defoaming ilure, consistently poor effect), Product Storage Conditions and Actual Appearance. Sample Submission for Testing: If a product quality issue is suspected, negotiate with Guoli Chemical to send retained samples or problematic batch samples back to the laboratory for physicochemical property re-inspection, including key parameters such as appearance, pH value (1% aqueous solution, standard range 5.0~8.0), viscosity (standard range 100~500 mm²/s), etc. Precautions During troubleshooting and waiting for technical support, do not arbitrarily add large amounts of defoamer or other chemicals to the system to avoid causing more severe process abnormalities or product quality incidents. Before switching defoamer types or mixing with third-party products, be sure to conduct small-scale compatibility tests to avoid antagonistic reactions between different brands of defoamers.

Question 3

How to purchase papermaking defoamer XS-02, polyether ester defoamer? What is the minimum order quantity?

Accepted Answer

If you need to purchase papermaking defoamer XS-02, please contact the Guoli Chemical sales team for the latest quotation and order placement. The actual price is subject to real-time quotes, and there is currently no fixed standard for the minimum order quantity. Detailed Description Papermaking defoamer XS-02 (polyether ester defoamer, CAS No.: 9004-81-3) is one of the core products of Guoli Chemical, belonging to high-efficiency non-ionic defoamers. According to the company's sales policy, product prices are affected by multiple ctors such as raw material market fluctuations, order quantity, and cooperation model. Therefore, fixed pricing is not used; instead, the sales team provides one-on-one real-time quotes. Regarding the minimum order quantity, the database currently has no clear fixed minimum order limit. Usually, Guoli Chemical can flexibly negotiate based on customer needs, supporting from small batch samples to full truckload purchases. It is recommended that you contact the sales team directly, explain the specific application scenario and expected usage, and the sales engineer will match you with the most suitable packaging specifications and procurement plan. Whether you are a paper mill, coating manucturer, or trader, Guoli Chemical offers flexible business cooperation methods and can send samples for you to test first, ensuring the product meets your defoaming needs before placing an official order. Product Packaging Specifications According to Guoli Chemical's database information, papermaking defoamer XS-02 is available in the following standard packaging options: Packaging TypeSpecification Plastic drum50kg Plastic drum200kg IBC toteApprox. 1000kg You can choose the appropriate packaging based on your production scale. For specific packaging costs and custom requirements, please confirm with the sales personnel. Purchase Process Suggestions Consultation and sampling: Contact the Guoli Chemical sales department, describe the application scenario (e.g., papermaking black liquor, white water circulation, or coating process), and request free samples for small-scale testing and verification. Obtaining a quote: After confirming the product's effectiveness, the sales team will provide a formal quotation based on your order quantity, packaging method, and delivery address. Signing the contract: After both parties confirm the price, quantity, delivery date, and logistics method, sign a purchase and sales contract. Payment and shipment: Complete payment according to the contract terms, and Guoli Chemical will arrange shipment and provide accompanying documents (quality inspection report, safety data sheet, etc.). After-sales support: Provide full technical support to help resolve any defoaming issues during use. Precautions This product is a non-hazardous chemical. The storage temperature should be maintained at 5~35°C. There are no special transportation restrictions; ordinary logistics is sufficient. For first-time use, it is recommended to conduct a small-scale test to determine the optimal dosage. For specific contact information or sample requests, please visit the Guoli Chemical official website or call the sales hotline.

Question 4

Is papermaking defoamer XS-02, a polyether ester defoamer, compliant with environmental requirements? Can a test report be provided?

Accepted Answer

Papermaking defoamer XS-02 meets environmental requirements, and multiple ecotoxicological data have confirmed its environmentally friendly characteristics Detailed explanation Papermaking defoamer XS-02 (polyether ester defoamer) was designed with full consideration of environmental compliance from the outset. According to the safety and ecological information in our company's product database, this product has low toxicity to aquatic organisms, with a 96-hour acute toxicity LC50 for fish greater than 100 mg/L, and is not easily bioaccumulative, readily biodegradable, and friendly to the aquatic ecological environment. The product itself is low-toxicity, non-irritating, and is a non-hazardous substance, not lling within the scope of dangerous chemicals, fully meeting the clean production requirements of the modern paper industry. The main component of this product is polyoxyethylene polyoxypropylene ether tty acid ester (CAS number: 9004-81-3), which is a non-ionic surctant. Under the Globally Harmonized System of Classification and Labelling of Chemicals (GHS), this product is not a hazardous substance, has no explosiveness, no oxidizing properties, is a non-flammable liquid (closed cup flash point greater than 150°C), and poses no fire or explosion risk under normal storage, transportation, and use conditions, ensuring production safety and environmental safety from the source. Ecotoxicological and environmental parameters IndicatorValue/ConclusionDescription Acute toxicity (Fish, 96h)LC50 > 100 mg/LLow toxicity to aquatic organisms BioaccumulationNot easily bioaccumulativeLow risk of bioaccumulation BiodegradabilityReadily biodegradableGood environmental compatibility Acute oral toxicity (Rat)LD50 > 2000 mg/kgLow toxicity Skin irritation/Eye irritationNon-irritatingComplies with GHS non-hazardous category FlammabilityNon-flammable liquid, flash point > 150°CNo fire risk under normal use Heavy metals (Total heavy metals)≤ 20 ppmExtremely low content, meets environmental standards Arsenic (As)≤ 2 ppmExtremely low content, meets environmental standards How to obtain the test report The above environmental data are derived from routine quality testing and safety assessments of our company's products. To obtain an official Product Certificate of Analysis (COA), Safety Data Sheet (SDS/MSDS), or third-party environmental test report, please contact us in the following ways: Contact Guoli Chemical Sales Department or Technical Department: Provide the type of report you need (COA / SDS / ROHS / REACH, etc.) and the batch number, and we will provide you with the official document stamped with the company seal. Customized testing services: If you have specific environmental standard testing requirements (such as EU REACH regulations, RoHS directive, specific eco-label certification for the paper industry, etc.), our company can assist in arranging testing by a third-party authoritative organization and provide the report. Routine batch data inquiry: The label on the outer packaging of the product barrel contains the batch number, and you can request the corresponding ctory release inspection report from us at any time. Precautions Please obtain and read the complete Safety Data Sheet (SDS) before use, and ensure that operations and waste discharge comply with local environmental regulations. Although the product has excellent environmental performance, avoid direct discharge into natural water bodies without treatment to prevent local high concentrations from affecting aquatic ecology. The data listed in the test report are based on the current batch of products, and the data sources are Guoli Chemical's quality inspection laboratory and cooperative third-party institutions, which are authentic and valid.

Question 5

What advantages does the papermaking defoamer XS-02 (polyether ester defoamer) have compared to other similar products?

Accepted Answer

Compared to similar products, the core advantage of the papermaking defoamer XS-02 (polyether ester defoamer) lies in the trinity of "silicone-free safety + full-process applicability + excellent high-temperature and strong alkali stability", especially solving the industry pain point of silicone spots easily generated by silicone defoamers. Detailed Description In the papermaking defoamer market, mainstream products are mainly divided into three categories: silicone type, ordinary polyether type, and polyether ester type. Guoli Chemical's papermaking defoamer XS-02 belongs to the polyether ester type (polyoxyethylene polyoxypropylene ether tty acid ester). The ester group end-capping design in its molecular structure gives it unique advantages in dispersibility, compatibility, and balance between defoaming and foam inhibition. Compared to silicone defoamers, XS-02 is completely silicone-free, fundamentally eliminating problems such as "fish eyes" in paper coating, white spots in printing, and poor sizing caused by silicone residues—this is the biggest concern the papermaking industry has long had for silicone products. Compared to ordinary polyether defoamers in the same silicone-free category, XS-02, after tty acid esterification modification, has a cloud point range (15~30°C) that better suits the working conditions of the papermaking wet end. Its self-emulsifying dispersion ability is superior, allowing it to quickly spread and form a film in water, achieving the dual effect of "instant defoaming + long-term foam inhibition". In terms of adaptability to harsh working conditions, XS-02 performs excellently. The pulping black liquor environment has high temperatures (up to 80~90°C) and strong alkalinity (pH 12~14). Ordinary defoamers often quickly deactivate or precipitate out under such conditions. The nonionic polyether ester structure of XS-02 enables it to maintain stable defoaming and foam inhibition performance in such extreme systems, effectively preventing black liquor tank overflow and ensuring the continuous and stable operation of the alkali recovery system. In the paper machine white water closed circulation system, as the number of white water cycles increases, dissolved and colloidal substances (DCS) accumulate, placing extremely high demands on the compatibility of defoamers. The nonionic nature of XS-02 gives it good compatibility with anionic and cationic auxiliaries, as well as various sizing agents and strengthening agents in the system, without causing side reactions or precipitation—this is difficult for many ionic defoamers to achieve. From the perspective of economy and management convenience, XS-02, with its ability to "cover multiple processes with a single product", can be used universally in key processes such as pulping black liquor, paper machine white water, coating color, and surce sizing, significantly simplifying the paper mill's procurement categories and inventory management. At the same time, its effective content is ≥99%, achieving ideal foam control at very low addition levels, making the overall use cost more competitive than traditional defoamers. Combined with its safety and environmental protection characteristics of low toxicity, non-irritating, and easy biodegradability, XS-02 perfectly meets the dual demands of clean production and cost reduction and efficiency improvement in the modern paper industry. Technical Parameters Parameter Papermaking Defoamer XS-02 Advantages Compared to Similar Products Product Type Polyether ester type (tty acid ester end-capped polyether) Combines the dispersibility of polyether + the defoaming activity of ester groups, stronger defoaming power than ordinary polyether Ionic Type Nonionic Compatible with both anionic and cationic auxiliaries, no side reactions, superior to ionic defoamers Appearance Milky white to light yellow viscous liquid — Active Content ≥99% High purity, no filler dilution, lower unit usage cost HLB Value 4~8 Low HLB ensures excellent self-emulsifying dispersion and defoaming spreading ability Cloud Point (1% aqueous solution) 15~30°C Adapts to the temperature range of the papermaking wet end, automatically releases defoaming activity as temperature rises pH Value (1% aqueous solution) 5.0~8.0 Near neutral, no interference with the pH of the papermaking system Acid Value ≤3.0 mgKOH\/g Low acid value indicates sufficient esterification reaction and good storage stability Saponification Value 40~140 mgKOH\/g Moderate ester bond content, achieving optimal balance between defoaming activity and stability Density (25°C) 0.85~1.05 g\/cm³ — Viscosity (25°C) 100~500 mPa·s Moderate viscosity for easy pumping and online addition Flash Point (Closed Cup) >150°C High flash point, non-flammable, r exceeding the common flash point of silicone defoamers (some solvent-containing types have a flash point of only 40~60°C) Silicon Content None (0%) Completely silicone-free, eliminating silicone spot defects, which is the most core advantage over silicone defoamers Acute Toxicity (Oral) LD50 > 2000 mg\/kg (low toxicity) High safety level, superior to some defoamer products containing solvents or APEO Biodegradability Easily biodegradable Does not accumulate easily in the environment, complies with increasingly stringent EU and domestic environmental regulations Water Dispersibility Self-emulsifying, easily dispersible in water No need for additional emulsifiers or high-speed stirring, easy online addition operation Application Suggestions For different processes, the following usage methods are recommended:

Question 6

How to store papermaking defoamer XS-02, polyether ester defoamer? What is the shelf life?

Accepted Answer

Papermaking defoamer XS-02 should be stored sealed in a cool, dry, and dark place, with a recommended temperature of 5~35 °C. The shelf life is usually 12 months (specifically subject to the product出厂 inspection certificate). Detailed description Papermaking defoamer XS-02 (polyether ester defoamer) is a non-ionic surctant product with relatively stable chemical properties. However, to ensure its long-term defoaming and foam suppression performance, storage conditions must strictly comply with the following requirements. This product is non-flammable and non-hazardous, with a closed cup flash point > 150 °C. Under normal storage conditions, there is no risk of fire or explosion, but it should still be kept away from heat sources and open flames. After opening, the product should be used as soon as possible. After each use, the container must be immediately resealed to avoid prolonged exposure to air. If the product is exposed to moist air for a long time, the polyether ester components may slowly hydrolyze, affecting self-emulsifying dispersion performance and defoaming efficiency. For bulk packaging, it is recommended to dispense into smaller containers for use to reduce contamination and moisture absorption risks associated with frequent opening of the main package. Storage condition details Storage requirementSpecific description Container statusKeep the original container or dedicated storage tank tightly sealed to prevent ingress of moisture and impurities Storage environmentCool, dry, dark place, avoid direct sunlight and UV radiation Recommended temperature range5 ~ 35 °C Avoid sourcesHeat sources, sparks, open flames, and strong oxidizers Leak preventionStorage area floor should be chemical-resistant, with spill containment dikes or trays Stacking requirementsStore upright according to packaging label orientation, avoid inversion or side-lying to prevent leakage Shelf life description Under strict adherence to the above storage conditions and with intact packaging, the recommended use period for papermaking defoamer XS-02 is 12 months from the date of production. This shelf life is a recommended usage period, not an absolute expiration. For products beyond the shelf life, it is recommended to conduct small-scale tests before use to confirm that the defoaming speed and foam suppression persistence still meet process requirements before continuing use. If the following abnormal conditions occur during storage, even if the shelf life has not been reached, the product should be discontinued: obvious stratification that cannot be restored by stirring, development of rancid odor (possibly due to ester bond hydrolysis), significant color deepening, or precipitation. These phenomena are usually caused by high-temperature storage, poor sealing, or contamination. Precautions Avoid long-term storage below 5 °C, as low temperature may cause increased viscosity or turbidity. This is a physical change, and the product can generally be restored by warming to room temperature and stirring evenly. If the product freezes during winter transportation or storage, it should be slowly thawed in a 10~30 °C environment. Do not use open flames or direct steam heating. Dispose of waste products and packaging in accordance with local environmental regulations; do not discharge into water bodies or soil. It is recommended to follow the "first-in, first-out" principle to arrange inventory turnover reasonably, ensuring product consumption within the optimal use period.

Question 7

What safety precautions should be taken when using papermaking defoamer XS-02, a polyether ester defoamer?

Accepted Answer

Papermaking defoamer XS-02 is a non-hazardous substance, but standard chemical handling procedures should still be followed, with emphasis on ventilation, personal protection, storage conditions, and emergency response. Hazard Overview According to the Globally Harmonized System of Classification and Labelling of Chemicals (GHS), papermaking defoamer XS-02 (polyether ester defoamer) is not classified as a hazardous substance. Its toxicological characteristics are as follows: low acute oral toxicity (rat LD₅₀ > 2000 mg/kg), non-irritating to skin and eyes, no skin sensitization; closed cup flash point > 150 °C, non-flammable liquid with no explosive or oxidizing properties; low toxicity to aquatic organisms (fish 96h LC₅₀ > 100 mg/L), with low bioaccumulation potential and good environmental compatibility. Safe Handling Precautions Although this product has a high safety profile, the following guidelines are recommended in practice: Ensure good ventilation in the workplace to avoid formation of aerosols or sprays; wear appropriate protective gloves and goggles during handling to prevent direct contact with skin and eyes; wash hands and exposed skin thoroughly after handling; do not eat, drink, or smoke in the work area. Storage Conditions Containers must be kept tightly closed and stored in a cool, dry, well-ventilated area away from light. The recommended storage temperature range is 5~35 °C. Keep away from heat sources, sparks, open flames, and strong oxidizing agents. The storage area should have containment measures for spills, and floors should be resistant to chemical attack. Emergency Response Guide Spill Handling In case of a spill, first eliminate the source of the leak and keep unauthorized personnel away. Small spills can be absorbed with inert absorbent materials (e.g., sand, vermiculite) and placed in sealed containers for disposal; for large spills, dike and contain, and transfer using explosion-proof pumps to recovery containers. Do not allow the spill to enter drains, surce water, or groundwater. After cleanup, flush the contaminated area with water and dispose of waste properly. First Aid Measures Route of ExposureFirst Aid Method InhalationMove the person to fresh air and keep breathing easy; if symptoms persist, seek medical attention. Skin ContactRemove contaminated clothing and wash with plenty of soap and water; if irritation or discomfort occurs, seek medical attention. Eye ContactImmediately flush with plenty of water or saline for at least 15 minutes, lifting eyelids to ensure thorough rinsing; if irritation persists, seek medical attention immediately. IngestionRinse mouth with water, do NOT induce vomiting; if symptoms occur, seek medical attention immediately. Firefighting Measures Suitable extinguishing media include: water fog, alcohol-resistant foam, dry powder, carbon dioxide. Combustion may produce irritating or toxic fumes including carbon monoxide and carbon dioxide. Firefighters should wear self-contained positive-pressure breathing apparatus and full protective clothing. Containers in the fire area should be cooled with water spray. Contaminated firefighting water must be collected and disposed of properly, and must not be discharged into the environment. Summary of Key Safety Points Overall, papermaking defoamer XS-02 is a high-safety industrial auxiliary. During use, simply ensure good ventilation, proper protection, sealed storage, and spill containment to effectively avoid safety risks. Its nonionic nature also ensures good compatibility with various auxiliaries in the system without dangerous side reactions.

Question 8

How to use papermaking defoamer XS-02, polyester ether defoamer? What is the recommended dosage?

Accepted Answer

Papermaking defoamer XS-02 is generally used by continuous drip addition or dilution before addition. The recommended dosage is 0.01% to 0.1% of the total system (i.e., 100~1000 ppm). The specific dosage needs to be determined through on-site small-scale tests. Detailed Explanation Papermaking defoamer XS-02 (polyester ether defoamer) is a non-ionic self-emulsifying defoamer, appearing as a white to light yellow viscous liquid with good self-emulsifying dispersion performance in water. Due to its high viscosity, to ensure rapid and uniform dispersion in the system and fully exert its defoaming and foam-inhibiting effects, it is generally recommended to use the method of continuous addition after online dilution, avoiding one-time direct dumping of large amounts that may cause local high concentration or uneven dispersion. According to information from the Guoli Chemical product database, this product can achieve ideal foam control effects at very low dosage, significantly reducing usage costs without interfering with subsequent processes such as sizing and coating. The specific usage method and addition point need to be designed according to the application section: In the pulp black liquor section, it is recommended to add at the black liquor tank inlet or the circulation pump inlet; in the paper machine white water circulation system, it is recommended to add at the white water tank or the stock pump inlet; in the coating process, it can be added during the slow stirring stage of the coating preparation tank. The product database currently has no precise universal dosage value because the optimal dosage of defoamer is affected by various ctors such as system temperature, pH value, stirring intensity, foam generation rate, and medium composition. The following recommended dosages are based on common industry practical experience: Application Recommendations Application Section Recommended Addition Method Reference Dosage (Percentage of Total System) Remarks Pulp Black Liquor Continuous drip addition (undiluted or pre-diluted) 0.05% ~ 0.2% (500~2000 ppm) High temperature and strong alkali environment, use the upper limit when foam volume is large Paper Machine White Water Circulation Continuous addition after online dilution 0.01% ~ 0.05% (100~500 ppm) Recommend diluting to 10%~20% concentration before use Coating Formulations Slow addition during preparation stage 0.02% ~ 0.1% (200~1000 ppm) Avoid high-speed stirring introducing excessive air Surce Sizing Liquid Direct addition into sizing liquid tank 0.01% ~ 0.05% (100~500 ppm) Ensure thorough mixing Water-based Inks and Adhesives Add in portions, slow stirring 0.05% ~ 0.3% (500~3000 ppm) Adjust according to formulation system Usage Key Points Pre-treatment dilution: Pre-dilute the undiluted product with water at a ratio of 1:5~1:10 to form an emulsion, which can significantly improve dispersion speed and defoaming efficiency. It is recommended to prepare and use immediately. Addition point: Choose a location upstream of the foam generation point or where fluid turbulence is high (such as pump inlet, pipe bends), utilizing fluid shear force to help disperse the defoamer. Addition method: It is recommended to use a metering pump for continuous drip addition, which provides more stable effects and longer foam inhibition time compared to intermittent batch addition. Determining optimal dosage: For first-time use, it is recommended to start with a gradient test from low concentrations (such as 50 ppm, 100 ppm, 200 ppm) to find the minimum dosage that just controls foam overflow as the economical usage amount. Precautions Product storage temperature is 5~35°C. If stratification occurs after long-term storage, stir evenly before use; product performance will not be affected. Diluted solution should be used within 24 hours to avoid stratification or microbial growth due to prolonged standing. Avoid direct mixing with strong oxidizers. Its non-ionic nature provides good compatibility with anionic and cationic additives, without causing precipitation or side reactions. Excessive addition may reduce paper sizing degree or cause oil spots; dosage should be strictly controlled to avoid exceeding the recommended range significantly. Wear protective gloves and goggles during operation to avoid prolonged direct skin contact. Although the product is low-toxicity and non-irritating, it is still recommended to maintain good ventilation and follow basic chemical handling procedures.

Question 9

In which industries and processes are papermaking defoamer XS-02 and polyether ester defoamer mainly used?

Accepted Answer

Papermaking defoamer XS-02 (polyether ester defoamer) is mainly used in the entire papermaking process, and is also widely applicable to supporting industries such as industrial water treatment, water-based inks and adhesives. Detailed Description Papermaking defoamer XS-02 is a high-efficiency non-ionic defoamer with polyether ester (polyoxyethylene polyoxypropylene ether tty acid ester) as the main component. Its core application field is concentrated in the papermaking industry, where a single product can cover multiple key processes from pulping to papermaking, significantly simplifying procurement and inventory management. With excellent self-emulsifying dispersion performance and stable defoaming and foam-suppressing capabilities, this product performs particularly well in high-alkali, high-temperature systems such as black liquor and white water. In addition to the papermaking industry, XS-02 is also extended to industrial water treatment systems, effectively suppressing foam generated during aeration and stirring processes, improving treatment efficiency, and having no adverse effect on microbial flora. In the production and use of water-based inks and adhesives, this product also quickly defoams and provides long-lasting foam suppression, avoiding printing white spots and bonding defects caused by bubbles, with excellent compatibility with the system. This product is also suitable for foam control needs in industries such as textiles and coatings, and is an industrial-grade defoamer with wide application and strong versatility. Detailed Application by Industry and Process Industry FieldSpecific Application ProcessProcess Characteristics and Function Papermaking IndustryBlack Liquor Defoaming in PulpingSuitable for high-temperature and strong alkali black liquor environment in pulping, effectively eliminates large amounts of foam generated during cooking and washing, prevents black liquor tank overflow, and ensures stable operation of the alkali recovery system. White Water Circulation System of Paper MachineUsed in the white water circulation of the paper machine wet end, quickly breaks down fine foam and microbubbles in white water, improves fiber and filler retention, reduces paper defects and fresh water consumption, effectively reduces the risk of paper breaks, and improves paper machine operating efficiency. Coating Preparation and ApplicationEfficiently removes bubbles from coating in the paper coating process, prevents coating scratches, pinholes and other defects, improves coating uniformity and final paper surce quality. Surce Sizing and Wet-End AdditionControls foam in sizing liquid and pulp addition processes, does not interfere with subsequent sizing, coating and other process steps, and has good compatibility with various sizing agents and strengthening agents. Industrial Water TreatmentCirculating Water and Wastewater TreatmentSuppresses foam generated during aeration and stirring processes, improves treatment efficiency, is friendly to microbial flora, and meets environmental requirements. Water-based Inks and AdhesivesEntire Production and Use ProcessQuickly defoams and provides long-lasting foam suppression, avoids printing white spots and bonding defects caused by bubbles, and has excellent system compatibility. Textile/Coatings IndustryTextile Finishing, Coating ProductionGeneral-purpose defoaming, suitable for foam control in water-based systems. Core Advantages and Application Recommendations Low Dosage Economy: Achieves ideal foam control effect at very low dosage, significantly reducing usage cost. It is recommended to start from a small amount and gradually adjust the dosage according to the actual foam situation to achieve the best cost performance. Non-Ionic Compatibility: Its non-ionic nature provides good compatibility with anionic, cationic additives, and various sizing agents and strengthening agents in the system, not prone to side reactions or precipitation, and can be safely used in complex chemical environments. Wide Temperature Range Stability: Performs stably in high-temperature and strong alkali environments such as papermaking black liquor. Recommended storage temperature is 5～35°C. Slight stirring before use to ensure uniformity. Precautions This product is non-hazardous, non-flammable (closed cup flash point >150°C), low toxicity and non-irritating, but it is still recommended to wear protective gloves and goggles during operation. Avoid formation of aerosol or spray; keep the workplace well ventilated. Keep container tightly closed when storing, store in a cool, dry, and dark place, away from strong oxidizers. In case of leakage, absorb with inert absorbent material and dispose of sealed, prevent entry into sewers and surce water.

Question 10

What are the physicochemical technical parameters of papermaking defoamer XS-02, polyether ester defoamer?

Accepted Answer

Papermaking defoamer XS-02 is a nonionic polyether ester defoamer with polyoxyethylene oleate as the main component. Its main physicochemical parameters include appearance, pH, density, viscosity, HLB value, cloud point, flash point, and other indicators, overall performance is mild and stable. Detailed Description Papermaking defoamer XS-02 (CAS: 9004-81-3) appears as a milky white to light yellow viscous liquid, with molecular structure C17H33COO(CH2CH2O)nH, molecular weight range approximately 400~1500. The product's active ingredient content (solid content) is ≥99%, moisture content ≤0.5%, free alcohol content ≤1.0%, and it is a high-purity defoamer product. The HLB value of this product is between 4 and 8, belonging to the water-in-oil (W/O) emulsifier category, with a low cloud point (15~30°C), and it is easy to self-emulsify and disperse in water. Its acid value ≤3.0 mgKOH/g, saponification value 40~140 mgKOH/g, hydroxyl value 45~60 mgKOH/g, iodine value 20~60 gI₂/100g, indicating moderate unsaturation, and the ester bond structure may undergo hydrolysis under strong alkaline conditions, which should be considered in formulation design. In terms of safety performance, the product has a flash point (closed cup) >150°C, belongs to non-flammable liquid, non-explosive and non-oxidizing. The pH value of 1% and 5% aqueous solutions are both 5.0~8.0, close to neutral, non-irritating to skin and eyes, acute oral toxicity LD50 >2000 mg/kg, belongs to low-toxicity substance, with good environmental compatibility. Technical Parameters Parameter Name Indicator Range / Description Parameter Name Indicator Range / Description Product NamePolyoxyethylene MonooleateIonic TypeNonionic CAS Number9004-81-3Appearance (25°C)Milky white to light yellow viscous liquid Molecular FormulaC17H33COO(CH2CH2O)nHMolecular WeightApproximately 400~1500 Active Ingredient / Solid Content≥99%Moisture≤0.5% Density (25°C)0.85~1.05 g/cm³Kinematic Viscosity (25°C)100~500 mPa·s Low Shear Viscosity100~500 mPa·sRefractive Index1.45~1.47 HLB Value4~8Cloud Point15~30°C pH (1% Aqueous Solution)5.0~8.0pH (5% Aqueous Solution)5.0~8.0 Acid Value≤3.0 mgKOH/gSaponification Value40~140 mgKOH/g Hydroxyl Value45~60 mgKOH/gIodine Value20~60 gI₂/100g Surce TensionApproximately 25~30 mN/mCritical Micelle Concentration (CMC)10~100 mg/L Flash Point (Closed Cup)>150°CFreezing Point / Melting Point Water SolubilityEasily dispersible in water (self-emulsifying)Foam CharacteristicsLow foam, defoaming function Free Alcohol Content≤1.0%Heavy Metals (as Pb)≤20 mg/kg Arsenic (As)≤2 mg/kgHygroscopicitySlightly hygroscopic Chemical StabilityStable under normal conditionsAlkali ResistanceGeneral, ester bond may hydrolyze under strong base UnsaturationModeratePackaging Specifications50kg plastic drum / 200kg plastic drum / IBC tote Application Recommendations Based on its HLB value (4~8) and cloud point (15~30°C) characteristics, this product is particularly suitable for medium to high temperature conditions in the paper industry. Recommended addition amounts vary by process: for black liquor defoaming, it is recommended to add 0.01%~0.1% of the total system mass; for paper machine white water circulation systems, recommended addition of 0.005%~0.05%; for coating defoaming, recommended addition of 0.1%~0.3%. Due to its nonionic nature, it is compatible with anionic, cationic auxiliaries, and sizing agents, without causing precipitation or side reactions. It is worth noting that the ester bond structure of the product may undergo hydrolysis under strong alkaline conditions (pH>12) at high temperatures, leading to gradual degradation of defoaming performance. In alkaline pulping black liquor applications, continuous drip feeding is recommended to maintain stable defoaming and foam suppression effects. Additionally, the low cloud point (15~30°C) means that the product may precipitate or have reduced dispersibility in low-temperature water systems. In winter, ensure the system temperature is above the cloud point, or pre-disperse with warm water before addition. Precautions Storage Temperature: Store in a cool, dry place at 5~35°C, sealed, avoid low-temperature freezing and high-temperature exposure. Operation Protection: Although it is a low-toxicity non-hazardous substance, it is recommended to wear protective gloves and goggles during handling, and wash hands thoroughly after operation. Compatibility Testing: Before compounding with other auxiliaries, it is recommended to perform a small-scale compatibility test to confirm no adverse reactions before batch application. Wastewater Treatment: The product is readily biodegradable, but spills should not be discharged directly into sewers or surce waters; collect and dispose of according to local regulations.

Paper Defoamer XS-02, Polyether Ester Defoamer

Product Details

Applications

Properties

Safety

Product Overview

Performance Features

Packaging and Storage

Defoamer / Specialty Applications

Product Properties

Safety

GHS

Handling

Storage

First Aid

Related Products

Property	Value
CAS No.	9004-81-3
Molecular Formula	C17H33COO(CH2CH2O)nH
Appearance	White to pale yellow viscous liquid
Ionic Type	Nonionic
Avg. Molecular Weight	Approx. 400~1500
Cloud Point	15~30
Active Content	≥99
pH Value(1%)	5.0~8.0
pH Value(5%)	5.0~8.0
Iodine Value	20~60
Solubility	Dispersible in water
Surface Tension	~25~30
CMC	10~100
Acid Value	≤3.0
Saponification Value	40~140
Hydroxyl Value	45~60
Moisture	≤0.5
Density	0.85~1.05
Kinematic Viscosity	100~500
Refractive Index	1.45~1.47
Flash Point	>150
Hygroscopicity	Slightly hygroscopic
Chemical Stability	Stable under general conditions
Foam Property	Low foam with defoaming function
Alkali Resistance	Fair; ester bonds may hydrolyze under strong alkali
Unsaturation	Moderate
Melting Point	<-10°C (liquid)
Low Shear Viscosity	100~500
Solid Content	≥99
Free Alcohol	≤1.0
Heavy Metal	≤20
Arsenic	≤2

Paper Defoamer XS-02, Polyether Ester Defoamer

Product Details

Applications

Properties

Safety

Product Overview

Performance Features

Packaging and Storage

Defoamer / Specialty Applications

Product Properties

Safety

GHS

Handling

Storage

First Aid

Related Products

Polyether Defoamer GP-330