Preparation method of nitrile group-containing epoxy resin toughening agent

Abstract

The invention provides a preparation method of a nitrile group-containing epoxy resin toughening agent. The method comprises the following steps: 1, weighing 40-60 parts by weight of aliphatic diamine and 30-50 parts by weight of acrylonitrile, and respectively stirring and reacting at room temperature and 60-80 DEG C for 1-2 hours to obtain acrylonitrile modified aliphatic amine; and 2, weighing 40-50 parts by weight of acrylonitrile modified aliphatic amine and 35-50 parts by weight of 1, 6-hexanediol diacrylate, and respectively stirring and reacting at room temperature and 60-80 DEG C for 1-2 hours to obtain the nitrile group-containing epoxy resin toughening agent. The preparation method disclosed by the invention is based on addition reaction polymerization, the reaction process has the advantages of no solvent, high yield, no subsequent treatment, autocatalysis, no introduction of other impurities and the like, and the prepared toughening agent is low in viscosity and excellent in epoxy resin toughening 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 epoxy resin tougheners containing nitrile groups are low-molecular-weight liquid nitrile rubbers, and the types of end groups mainly include carboxyl groups, amino groups, hydroxyl groups, and vinyl groups. After toughening the epoxy resin, the nitrile rubber is distributed in the epoxy continuous phase in granular form, similar to the "sea island" structure, which can effectively solve the problems of high brittleness and poor impact resistance of epoxy rubber. 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 nitrile rubber, prepolymerizing with epoxy resin or introducing other active groups can be used. [0003] In the pr...

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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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