Polypropylene glycol PPG-200 (CAS No.: 25322-69-4) is a nonionic polymer with an appearance of a colorless to slightly yellow transparent viscous liquid, a molecular weight of approximately 190~210, and excellent solubility and chemical compatibility. According to the Guoli Chemical product database, PPG-200 is used as a key initiator in polyurethane synthesis and as a functional additive or intermediate in other fields. In practical applications, there is no single fixed usage method; instead, it must be flexibly adjusted based on the target product and process requirements.
In flexible polyurethane foam production, PPG-200 directly participates in the polymerization reaction as a polyol initiator, and needs to be mixed with isocyanates (such as TDI, MDI) according to the formulation ratio, usually with the addition of catalysts, blowing agents, foam stabilizers and other additives. In the lubricant and hydraulic fluid field, PPG-200 is used as a synthetic base oil component, and can be directly added or blended with other base oils; the addition amount is determined based on the viscosity grade and performance requirements of the final product. In release agent applications, PPG-200 is usually diluted with an appropriate solvent to the working concentration and then sprayed or brushed onto the mold surface. In defoamer preparation, PPG-200 is a key raw material, which needs to be compounded with hydrophobic silica, emulsifiers and other agents to form a defoamer masterbatch, and then diluted for use.
In the fine chemical synthesis field, PPG-200, as an important intermediate for nonionic surfactants, needs further modification through chemical reactions such as esterification and etherification, introducing hydrophilic or hydrophobic groups to adjust the HLB value. In cosmetics, PPG-200 acts as a moisturizing and lubricating component, usually added to the formulation in the post-addition stage below 45°C. The recommended dosage is generally between 1% and 10%, and needs to be adjusted according to the skin feel and stability of the specific formulation. According to Guoli Chemical data, PPG-200 has an effective content of ≥99%, a pH value of 5.0~7.0 for a 1% aqueous solution, and a hydroxyl value of 540~590 mgKOH\/g.
| Parameter | Specification |
|---|---|
| Appearance | Colorless to slightly yellow transparent viscous liquid |
| Molecular weight | 190~210 |
| Effective content | ≥99% |
| Hydroxyl value | 540~590 mgKOH\/g |
| Kinematic viscosity (40°C) | 30~40 mm²\/s |
| Density | 1.004~1.010 g\/cm³ |
| pH value (1% aqueous solution) | 5.0~7.0 |
| Acid value | ≤0.10 mgKOH\/g |
| Moisture content | ≤0.10% |
| Flash point (closed cup) | ≥200°C |
| Freezing point | Approx. -45°C |
| HLB value | Approx. 1 |
| Ionic type | Nonionic |
| Foam characteristics | Low foam |
| Solubility | Soluble in water, readily soluble in organic solvents such as alcohols, esters, and ketones |