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Anonymous users2024-02-151. Various forms. A wide range of resins, curing agents, and modifier systems can be adapted to almost every application, and can range from very low viscosity to high melting point solids.
2. Easy curing. With a wide range of curing agents, epoxy systems can be cured in the temperature range of almost 0 180.
3. Strong adhesion. The presence of polar hydroxyl and ether bonds inherent in the molecular chain of epoxy resin gives it high adhesion to various substances. Epoxy cures with low shrinkage and low internal stress, which also contributes to improved adhesion strength.
4. Low shrinkage. The reaction between the epoxy resin and the curing agent used is carried out by direct addition reaction or ring-opening polymerization of the epoxy group in the resin molecule, and no water or other volatile by-products are released. Compared to unsaturated polyester resins and phenolic resins, they show very low shrinkage (less than 2%) during curing.
5. Mechanical properties. The cured epoxy resin system has excellent mechanical properties.
6. Electrical performance. The cured epoxy resin system is an excellent insulating material with high dielectric properties, surface leakage resistance, and arc resistance.
7. Chemical stability. In general, cured epoxy systems have excellent resistance to alkalis, acids, and solvents. Like other properties of cured epoxy systems, chemical stability depends on the resin and hardener used.
Proper selection of epoxy resins and curing agents can give them special chemically stable properties.
8. Dimensional stability. The combination of these properties gives epoxy resin systems outstanding dimensional stability and durability.
9. Mold resistance. The cured epoxy system is resistant to most molds and can be used in harsh tropical conditions.
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Anonymous users2024-02-14There are many types of epoxy resins:
Water-soluble epoxy resin.
Flame retardant epoxy resin.
Specialty epoxy resins.
High purity solid epoxy resin.
Bisphenol A solid epoxy resin.
High purity liquid epoxy resin.
Bisphenol A liquid epoxy resin.
For the specific properties and characteristics of bisphenol A, please refer to the book "Application Principles and Technologies of Epoxy Resin".
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Anonymous users2024-02-13Epoxy resin has an elongated hydroxyl group and an epoxy group, and the elongated hydroxyl group can be. to react with isocyanates. Epoxy resin is used as a polyol to directly add a component of the hydroxyl group of the polyurethane adhesive, and only the hydroxyl group participates in the reaction using this method, and the epoxy group fails to react.
The epoxy is opened with an acidic resin and a carboxyl group, and then reacts with the isocyanate in the polyurethane adhesive. Epoxy resin can also be dissolved in ethyl acetate, phosphoric acid is added to the heating reaction, and its adduct is added to the polyurethane adhesive; the initial adhesion of the glue; Heat resistance and hydrolytic stability can be improved, and polyols can be generated by reaction of alcohol amine or amine, and the presence of tertiary nitrogen atoms in the adduct can accelerate the NCO reaction. The use of epoxy resin as a polyhydroxy component combines the advantages of polyurethane and epoxy resin, and has good adhesion strength and chemical resistance, and the epoxy resin used in the manufacture of polyurethane adhesive generally uses EP-12, EP-13, EP-16 and EP-20 varieties.
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