Bismaleimide resin for non-autoclave molding prepreg and preparation method thereof

Abstract

The invention provides bismaleimide resin for a non-autoclave molding prepreg and a preparation method thereof. The bismaleimide resin for the non-autoclave molding prepreg uses thermoplastic resin toughening agents with high heat resistance; the toughness of the resin is improved; meanwhile, the heat resistance is ensured; amine curing agents in the system react with bismaleimide resin to generate active amino groups; molecular design is performed through selecting allyl process modifiers and proper epoxy resin; the curing temperature can be lowered, meanwhile, the heat resistance is ensured.No solvent is used in the system; the low-molecular-weight ingredients are few; in addition, no micromolecular products are generated in the reaction; pores generated in the curing process are effectively reduced; toughening agents and bismaleimide monomers are added into a base body in a partial dissolution and partial dispersion mode; thixotropic agents are added for regulating the resin rheological behaviors; the problems of poor room temperature viscosity of the resin, no film forming performance, too fast viscosity reduction in the curing process, high porosity due to prepreg air passageblockage can be solved; the application process performance such as laying performance and storage stability of the prepreg can be improved.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to a double-horse resin for non-autoclave molding prepreg and a preparation method thereof. Background technique [0002] The autoclave forming process has the advantages of simple molds, compact parts, small dimensional tolerances, and low void ratio. Therefore, the main load-bearing and secondary load-bearing structural composite components in the aerospace and other fields are often produced by the autoclave forming process. The method has the disadvantages of large energy consumption, many auxiliary materials, high cost, and the size of the parts is limited by the size of the autoclave. [0003] The out of autoclave process (Out Of Autoclave), which appeared in the 1990s, effectively overcomes the shortcomings of the autoclave process, especially the non-autoclave prepreg, which is sometimes called VBO (Vacuum Bag Only) Prepreg, compared with the traditional autoclave c...

AI Technical Summary

Problems solved by technology

[0006] In view of the above existing problems, the present invention aims at overcoming the defects in the prior art to improve the preparation process of Shuangma resin-based composite materials, reduce production costs, and solve the problem of high manufacturing cost and increasing dosage of advanced Shuangma resin-based composite materials. The problem of low production efficiency is to solve the problem of high viscosity and poor viscosity of conventional Shuangma resin used in the preparation of non-autoclave prepregs. The prepregs produced have poor laying properties, short storage period at room temperature, and high porosity of cured products. To reduce the mechanical properties of composite materials and other problems, provide a non-autoclave molding prepreg Shuangma resin and its preparation method,