Combination of polyurethane modified epoxy resin and modified secondary amine delayed-hardening agent as primer of polyurea elastomer

Abstract

The invention relates to a combination of a polyurethane modified epoxy resin and a modified secondary amine delayed-hardening agent as a primer of polyurea elastomer. The primer provided by the invention comprises the polyurethane modified epoxy resin as A component and the modified secondary amine delayed-hardening agent as B component, wherein the synthesis route of the A component comprises raw material dehydration, polyurethane prepolymer synthesis and EP grafting copolymerization; the synthesis route of the B component comprises Michael addition and monoepoxide addition. With the curing rate of A: B being 6: 1, the primer can be used after aging for 5-10 minutes. Applied to coat polyurea elastomer as a primer, the combination provided by the invention has good system adaptability and superstrong adhesive property; and after the polyurea elastomer is sprayed on the surface of a sandblasting steel matrix in construction, the adhesive strength can reach over 10Mpa and the peeling strength can reach more than 50kN/m.

Description

technical field [0001] The invention relates to a primer for polyurea elastomers, in particular to a polyurethane modified epoxy resin combined with a modified secondary amine delayed curing agent as a primer for polyurea elastomers. Background technique [0002] Spray polyurea elastomer is a type of elastomer compound formed by the reaction of isocyanate component and amino-terminated compound component. It is a solvent-free and environmentally friendly coating technology developed in the past ten years. Due to its excellent physical and chemical properties, excellent manufacturability and environmental protection, it fully demonstrates its unparalleled superiority over traditional coating technology and has been developed rapidly, so it is widely used in construction, shipbuilding, water conservancy, transportation, machinery, chemical industry, mining, Fields such as environmental protection and entertainment have shown strong vitality, especially in the fields of hig...

AI Technical Summary

Problems solved by technology

[0006] In the past, in the application of polyurea, everyone thought that there was no need for a primer system. As a result, after a period of use, there were insufficient adhesion and peeling off. Later, people realized this problem bu

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