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EPB is the introduction of epoxy groups on the molecular chain of HTPB, featuring outstanding oil resistance, aging resistance, good transparency, and excellent low-temperature performance. The hydroxyl group at the end of the molecular chain and the epoxy group within the molecular chain serve as the reactive groups, allowing it to be cured effectively with a wide variety of isocyanates and epoxy curing agents.
The cured polymer demonstrates excellent physical and chemical properties. It provides low shrinkage, high hardness, stability against alkalis and most volumes, and significantly improves the mechanical properties, adhesive strength, and heat resistance of polyurethane materials.
Polar groups substantially improve the product's adhesive properties with both metallic and non-metallic materials, including glass. It also exhibits superior dielectric properties for electronic and structural applications.
Perfectly suited for formulated systems in adhesives, sealants, protective coatings, epoxy resin toughening agents, and high-performance polyurethane elastomers.
| Item | Type L | Type M | Type H |
|---|---|---|---|
| Molecular weight | 2000-4000 | ||
| Epoxy value, mmol/g | 0.5-1.5 | 2.0-4.0 | 4.5-5.5 |
| Viscosity (40℃), Pa.s | ≤5.0 | ≤20 | ≤50 |
| Water mass fraction, % | <0.05 | ||
