Thermocuring polyurethane acrylic resin and application

Abstract

The invention discloses a thermocuring polyurethane acrylic resin and application thereof, and belongs to the field of organic polymer materials. The resin comprises A) an isocyanate composition comprising at least one isocyanate; B) a polyol composition containing unsaturated double bonds; C) a peroxide free radical reaction initiator; and D) a composite accelerant containing metal salt and diketone. A composite accelerant is formed by compounding cobalt salt, copper salt and binary ketone, and in the polyurethane acrylic resin system, the binary ketone and the combined salt can form a complex at normal temperature, so that the promoting effect of the combined salt is limited; no obvious catalytic action exists on the polyurethane reaction of isocyanate and polyol and the free radical polymerization reaction of acrylate, and enough long operable time can be obtained; and meanwhile, when being heated to 60 DEG C or above, the complex is decomposed into combined salt, so that the reaction of isocyanate and polyol can be quickly promoted, gel is cured in a relatively short time, and the process friendliness is very excellent.

Description

technical field [0001] The invention belongs to the field of organic macromolecular materials, in particular to a thermosetting polyurethane acrylic resin and its application. Background technique [0002] Polyurethane acrylic resin molecules contain acrylic functional groups and urethane bonds. By molecular design of polyurethane acrylate, adjusting the ratio of rigid segment and flexible segment in the molecular chain, molecular weight and structure, and the type of end-capping agent, etc., can Materials with different properties are prepared. The cured polymer has the high wear resistance, adhesion, flexibility, high peel strength and excellent low temperature resistance of polyurethane, as well as the excellent optical properties and weather resistance of polyacrylate. It is widely used in light-curing coatings, inks and as a matrix resin for fiber-reinforced composites. The curing reaction process of the resin includes the reaction of isocyanate and hydroxyl group and ...

AI Technical Summary

Problems solved by technology

However, cobalt salts can promote the reaction of isocyanate, polyol and moisture in the system at room temperature while promoting acrylate free radical polymerization, shortening the reaction time of the resin, and the bubbles produced by the reaction of isocyanate and moisture in the system are harmful to the environment. The strength of the product has an impact, which is still insufficient when manufacturing large-scale products, or products that have high requirements for gel time and product strength

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