Polypropylene glycol PPG-400 (CAS No.: 25322-69-4) is a nonionic surfactant, appearing as a colorless to slightly yellow transparent viscous liquid, with a molecular weight of about 380~420, and a hydroxyl value of 260~300 mgKOH/g. Its molecular structure contains primary hydroxyl groups and ether bonds, giving it excellent solubility, reactivity, and surface activity. The usage method varies greatly depending on the application scenario: In the polyurethane industry, PPG-400 directly participates in the polymerization reaction as a soft segment polyol component, typically reacting with isocyanates (such as TDI, MDI) and other polyols, catalysts, blowing agents, etc., according to the formula ratio; In the personal care and pharmaceutical fields, it can be directly added to the water phase or oil phase and stirred to dissolve, used as a humectant, lubricant, or solubilizer; In lubricants and industrial fluids, it can be used alone or compounded with other base oils.
Since PPG-400 is easily soluble in various solvents such as water, alcohols, esters, and ketones, solubility is usually not an issue in practical operations. It is recommended to slowly add it to the formulation system under stirring conditions to ensure uniform dispersion. If used for polyurethane synthesis, the moisture content must be strictly controlled (moisture of this product ≤0.1%) to avoid side reactions between water and isocyanates. The product has low foam characteristics, with a cloud point of about 50°C (1% aqueous solution), and the aqueous solution may become turbid when approaching or exceeding the cloud point temperature, so attention should be paid to the operating temperature conditions.
| Parameter Item | Indicator Value | Description |
|---|---|---|
| Appearance | Colorless to slightly yellow transparent viscous liquid | — |
| Molecular Weight | 380~420 | — |
| Hydroxyl Value | 260~300 mgKOH/g | High primary hydroxyl content, moderate reactivity |
| pH Value (1% Aqueous Solution) | 6.0~8.0 | — |
| Moisture | ≤0.1% | — |
| Acid Value | ≤0.1 mgKOH/g | — |
| Density (25°C) | 1.004~1.010 g/cm³ | — |
| Kinematic Viscosity (40°C) | About 70 mm²/s | Stable viscosity-temperature characteristics |
| Viscosity (25°C) | 70~90 mPa·s | — |
| Flash Point (Closed Cup) | ≥200°C (about 220~230°C) | — |
| Cloud Point (1% Aqueous Solution) | About 50°C | — |
| HLB Value | About 2.0 | Low HLB value, suitable for W/O emulsification |
| Surface Tension (1% Aqueous Solution) | About 38 mN/m | — |
| Freezing Point | ＜-30°C | — |
Special Note: The product database of Guoli Chemical does not provide specific recommended addition amounts for various application fields. The following are reference dosage ranges based on general industry experience. The actual addition amount must be determined through formulation experiments.
| Application Field | Typical Usage Method | Reference Addition Amount (Industry Common Value) |
|---|---|---|
| Polyurethane Foam/Elastomer | As a soft segment polyol component, mixed and reacted with other polyols, isocyanates, catalysts, etc. | 10%~50% of total polyol |
| Polyurethane Coatings/Adhesives | As a polyol component involved in prepolymer or curing system | 5%~30% of resin solid content |
| Personal Care Products (Creams/Lotions) | Directly added to water phase or oil phase, stirred until uniformly dissolved | 1%~10% |
| Pharmaceutical Ointments/Suppository Bases | Melted and mixed with other base materials, then cooled and molded | 5%~30% (depending on formulation) |
| Synthetic Lubricant Base Oil | Used alone or compounded with ester oils, PAO, etc. | 10%~100% |
| Metalworking Fluids | Added as a lubricity additive or co-solvent in the formulation | 5%~20% |
| Defoamer Raw Material | Compounded with hydrophobic silica, emulsifiers, etc. to prepare defoamers | 20%~60% |
| Mold Release Agent Component | Compounded with other mold release ingredients, diluted and sprayed for use | 5%~30% |
| Industrial Cleaning/Textile Auxiliaries | Used as a nonionic surfactant intermediate or directly | 1%~10% |