Polypropylene Glycol PPG-200 (CAS: 25322-69-4) is a chemical intermediate with flexible usage and excellent compatibility. Its usage method mainly depends on the specific application field: In synthetic formulations (e.g., lubricants, hydraulic fluids), it is usually used as a base component or functional additive, directly mixed with other base oils or ester raw materials in proportion; In defoamer compounding, it can be first mixed with dispersants and carriers to form a defoamer masterbatch before dilution and use; In mold release agent applications, it usually needs to be dissolved in a suitable solvent (such as water or organic solvent) to prepare a working fluid, which is then applied to the mold surface by spraying or brushing.
During operation, due to the viscosity and hygroscopicity of PPG-200 (density: 1.004~1.010 g/cm³, kinematic viscosity: 30~40 mm²/s), it is recommended to slowly add it to the formulation system under stirring conditions. If the material viscosity increases due to low winter temperatures, it can be preheated in an environment of 25~35°C for 24 hours in advance until the material recovers fluidity before use. Open flame direct heating is strictly prohibited. When used as a polyol initiator in flexible polyurethane foam production, it must be precisely measured according to the predetermined isocyanate index, forming the polyol component together with other polyether polyols, catalysts, blowing agents, etc.
PPG-200 has stable chemical properties and low foam characteristics. It is soluble in various solvents such as water, alcohols, esters, and ketones, giving it broad compounding possibilities. However, before long-term use in strong acid or alkali systems, it is recommended to conduct small-scale stability verification tests first.
Guoli Chemical Database does not have exact standard addition amount data for each application field. The following are general reference ranges based on chemical application practices (actual dosage needs to be determined through formulation experiments):
| Application Field | Recommended Addition Amount Range | Usage Instructions |
|---|---|---|
| Synthetic Lubricant Base Oil | 10% ~ 95% | As the main base oil or co-base oil component, blended with synthetic esters, PAO, etc. |
| Fire-Resistant Hydraulic Fluid | 20% ~ 60% | Compounded with water and additives to form high water-based or water-in-oil hydraulic fluid |
| Industrial Mold Release Agent | 1% ~ 10% | Diluted in water or solvent to prepare working fluid, sprayed on mold surface |
| Defoamer Core Raw Material | 5% ~ 30% | As defoaming active substance, compounded with dispersants, emulsifiers, carriers |
| Cosmetic Intermediate | 0.5% ~ 5% | Added as moisturizing lubricant in cream and lotion formulations |
| Flexible Polyurethane Foam Polyol | 5% ~ 40% | Accounts for this proportion in polyol component, affecting foam hardness and resilience |
| Surfactant Synthesis | According to reaction stoichiometric ratio | Used as initiator to participate in ethoxylation or esterification reaction, dosage determined by molecular design |
Feeding Sequence: PPG-200 is usually recommended to be added after the basic liquid components of the formulation are added and before the active ingredients are added, or pre-mixed with other components as a carrier. In defoamer compounding, PPG-200 can be first stirred and dispersed with solid particles such as hydrophobic silica at higher temperatures (e.g., 80~120°C) to prepare a defoamer active masterbatch.
Temperature Control: PPG-200 has a flash point greater than 200°C and excellent thermal stability, but it is recommended that the normal operating temperature not exceed 150°C to avoid potential oxidative discoloration. In low-temperature environments, the increase in material viscosity is normal and can be restored after preheating.