Low-viscosity epoxy toughening agent based on acrylate and aliphatic amine

Abstract

The invention relates to a low-viscosity epoxy toughening agent based on acrylate and aliphatic amine. The low-viscosity epoxy toughening agentis a product obtained by reacting the following components in parts by weight: 1-50 parts of octylamine, 1-50 parts of dodecyl primary amine, 1-50 parts of oleyl primary amine and 40-100 parts of diacrylate compound, wherein the viscosity of the low-viscosity epoxy toughening agent is 50-1000 centipoises. According to the invention, the low-viscosity epoxy toughening agent is prepared on the basis of addition polymerization reaction, and has the advantages of rapid reaction, no solvent, no subsequent treatment, no introduction of other impurities and the like; and the molecular weight and the viscosity of the toughening agent can be controlled by adjusting the feeding ratio of the alkyl primary amine to the diacrylate compound, and the prepared epoxy toughening agent has the advantages that the viscosity of an epoxy adhesive is remarkably reduced, the toughening effect is good, the water absorption rate is low and the like.

Description

technical field [0001] The invention belongs to the technical field of adhesives, in particular to a low-viscosity epoxy toughening agent based on acrylate and aliphatic amine. Background technique [0002] Epoxy adhesives have excellent adhesion and chemical corrosion resistance, and are widely used in aerospace, civil engineering, household appliances and other fields. However, the untoughened epoxy adhesive product is brittle, and the elongation at break of the main body material is low. It is easy to crack when subjected to impact or internal stress, and even causes problems such as degumming in severe cases. The use of liquid rubber to toughen is one of the common measures to modify epoxy adhesives, such as acrylate rubber, which does not contain double bonds in its main chain, is not easy to oxidative degradation or high temperature crosslinking, and has good properties for epoxy adhesives. toughening effect. Invention patent CN101993670B discloses the preparation me...

AI Technical Summary

Problems solved by technology

[0003] The existing acrylate-based epoxy toughening agent technology has a high viscosity of the toughening agent, which will cause the viscosity of the epoxy adhesive system to be high; in addition, catalysts, chain transfer agents and other additives need to be added during synthesis , it is difficult to be removed in toughener products, which will affect the performance

The preparation process generally adopts free radical polymerization initiated by peroxide. There are many steps and complicated methods, and the reaction conditions are harsh. Inert gas protection is needed to prevent the oxygen in the air from inhibiting polymerization.