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. Unsatisfactory 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
| Parameter | Value/Description | Data Source |
|---|
| Ionic Type | Nonionic | Guoli Chemical Product Database |
| Appearance | Milky white to light yellow viscous liquid | Guoli Chemical Product Database |
| Active Ingredient Content | ≥99% | Guoli Chemical Product Database |
| HLB Value | 4~8 | Guoli Chemical Product Database |
| Cloud Point (1% Aqueous Solution) | 15~30℃ | Guoli Chemical Product Database |
| pH Value (1% Aqueous Solution) | 5.0~8.0 | Guoli Chemical Product Database |
| Alkali Resistance | Average, ester bonds may hydrolyze under strong alkali | Guoli Chemical Product Database |
| Density (20℃) | 0.85~1.05 g/cm³ | Guoli Chemical Product Database |
| Kinematic Viscosity | 100~500 mm²/s | Guoli Chemical Product Database |
| Flash Point (Closed Cup) | >150℃ | Guoli Chemical Product Database |
| Storage Temperature | 5~35℃ | 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 failure, 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.
