A kind of preparation method of epoxy resin toughening agent containing nitrile group

Abstract

A preparation method of a nitrile group-containing epoxy resin toughening agent, the preparation method is realized by the following steps: Step 1: Weigh 40-60 parts of aliphatic diamine and 30-50 parts of acrylonitrile by weight , respectively at room temperature and 60-80 ℃, stirring and reacting for 1-2 hours to obtain acrylonitrile-modified aliphatic amine; Step 2: weighing 40-50 parts by weight of acrylonitrile-modified aliphatic amine and 35-50 parts by weight of acrylonitrile-modified aliphatic amine 1, 6 parts of hexanediol diacrylate are respectively stirred and reacted at room temperature and 60-80° C. for 1-2 hours to obtain a nitrile group-containing epoxy resin toughening agent. The preparation method of the invention is based on addition reaction polymerization, and the reaction process has the advantages of no solvent, high yield, no subsequent treatment, self-catalysis, no introduction of other impurities, etc., the prepared toughening agent has low viscosity and excellent toughening epoxy resin performance .

Description

technical field [0001] The invention belongs to the technical field of synthetic resins, and in particular relates to a preparation method of a cyano group-containing epoxy resin toughening agent. Background technique [0002] Common nitrile-containing epoxy resin tougheners are low-molecular-weight liquid nitrile rubber, and its end groups are mainly carboxyl, amino, hydroxyl, vinyl, etc. After toughening the epoxy resin, the nitrile rubber is distributed in the continuous epoxy phase in a granular form, similar to the "island" structure, which can effectively solve the problems of high brittleness and poor impact resistance of epoxy resin. In order to improve the interaction between liquid nitrile rubber and epoxy resin and improve the toughening effect, methods such as adjusting the nitrile group content in the nitrile rubber, prepolymerizing with epoxy resin or introducing other active groups can be adopted. [0003] In the prior art, liquid nitrile rubber is generally ...

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Problems solved by technology

[0004] The existing nitrile-containing liquid nitrile rubber preparation technology, the matrix resin is obtained by radical polymerization of acrylonitrile and other monomers in solution or emulsion, the polymerization conditions are strictly controlled, and the initiator, persulfide, Various auxiliary agents such as emulsifiers and electrolytes, the post-processing procedures are complicated and cumbersome; the prepared liquid nitrile rubber generally has a linear molecular structure, and the intermolecular interaction force is large. Although the molecular weight is only a few thousand, the viscosity is as high as tens of thousands of centipoise, such as The viscosity of carboxyl-terminated butyronitrile with 18% acrylonitrile content reaches 135,000 centipoise@27°C, and the viscosity of amino-terminated butyronitrile with 18% acrylonitrile content reaches 200,000 centipoise@27°C, which is suitable for the molding of toughened epoxy resin The process brings great difficulties. If various diluents are added, it will bring about unfavorable factors such as material performance degradation and environmental pollution.

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