Introduction of the characteristics of artificial resin epoxy resin: It has hydroxyl and epoxy groups, which can react with isocyanate.
Epoxy resin is added as a polyol directly to the hydroxyl-containing component of the polyurethane adhesive. With this method, only the hydroxyl group participates in the reaction, but the epoxy group fails to react.
Using acid resin, carboxyl group, to open the epoxy ring, and then react with isocyanate in polyurethane adhesive.
Can also dissolve epoxy resin in ethyl acetate, add phosphoric acid to warm the reaction, and its adduct is added to the polyurethane adhesive;
The initial viscosity of the glue; heat resistance and hydrolytic stability can be improved 0r can also use alcohol amine or amine reaction to generate polyols, the presence of tertiary nitrogen atoms in the adduct, can accelerate the NCO reaction.
Using synthetic resin epoxy resin as the polyhydroxy component combines the advantages of polyurethane and epoxy resin,
has good bonding strength and chemical resistance,
Epoxy resins used in the manufacture of polyurethane adhesives generally use EP-12, EP-13, EP-16 and EP-20 and other varieties.
ways to improve
1. Select curing agent;
2. Add reactive thinner;
3. Add filler;
4. Add another kind of thermosetting or thermoplastic resin;
5. Improve the epoxy resin itself.