A low viscosity epoxy toughener based on acrylates and aliphatic amines

Abstract

The present invention is a low-viscosity epoxy toughening agent based on acrylate and aliphatic amine, which is composed of 1-50 parts of octylamine, 1-50 parts of dodecyl primary amine, 1-50 parts of oil-based primary amine by weight. A product obtained by reacting an amine with 40-100 parts of a diacrylate compound, and the viscosity of the low-viscosity epoxy toughening agent is 50-1000 centipoise. The low-viscosity epoxy toughener of the invention is prepared based on an addition polymerization reaction, and has the advantages of fast reaction, no solvent, no subsequent treatment, and no introduction of other impurities. By adjusting the feeding ratio of primary alkyl amine and diacrylate compound, the molecular weight and viscosity of the toughening agent can be controlled. The prepared epoxy toughening agent has the advantages of significantly reducing the viscosity of epoxy adhesive, good toughening effect and low water absorption. Etc.

Description

technical field [0001] The invention belongs to the technical field of adhesives, and in particular relates to a low-viscosity epoxy toughening agent based on acrylate and aliphatic amine. Background technique [0002] Epoxy adhesives have excellent adhesion and chemical resistance and are widely used in aerospace, civil construction, household appliances and other fields. However, the untoughened epoxy adhesive products are relatively brittle, the elongation at break of the bulk material is low, and it is easy to crack when subjected to impact or internal stress, and even cause problems such as degumming in severe cases. Toughening with liquid rubber is one of the common measures for modifying epoxy adhesives. For example, acrylate rubber does not contain double bonds in the main chain, is not prone to oxidative degradation or high temperature crosslinking, and has good properties for epoxy adhesives. toughening effect. Invention patent CN101993670B discloses a method for...

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.