Method for preparing high-tenacity hot-melt prepreg by hot-melt resin matrix

Abstract

The invention provides a method for preparing a high-tenacity hot-melt prepreg by a hot-melt resin matrix. Aiming at conditions that preparation difficulty of a high-tenacity resin matrix is high and the difficulties of subsequent technical processes are easily increased, a non-high-tenacity or non-toughened resin matrix with excellent processing properties is adopted, a proper amount of small-grain-size toughening powder is added in a preparation process of the prepreg in a specific manner, the overlaying property of the prepreg can be maintained, parameters of a curing process of the prepreg are not basically changed, and the tenacity of a composite material can be greatly improved. According to the method for preparing the high-tenacity hot-melt prepreg by the hot-melt resin matrix, the tenacity of the composite material after being solidified is greatly improved when the processing property of the prepreg is maintained; and the method can be applied to hot press molding of aerospace composite material structures and can be applicable to high-tenacity composite material structures in national defense industry applications such as ships, warships and weapons as well as various composite material structures being subjected to hot press molding.

Description

technical field [0001] The invention relates to a method for preparing a high-toughness hot-melt prepreg by using a hot-melt resin matrix, which belongs to the composite material prepreg preparation technology. Background technique [0002] In the new generation of aerospace vehicles, the proportion of fiber-reinforced resin-based composite materials in the structural weight has increased significantly, and the use of parts has become more extensive. However, the use of composite materials is limited by the toughness of composite materials. In many structures, especially It is the main load-bearing structure that requires the composite material to have better toughness, which requires the toughness of the resin matrix to be improved. [0003] According to the level of toughness, the resin matrix can be divided into three generations, the first generation is non-toughened resin, represented by 5208; the second generation is medium toughened resin, represented by 914; the thir...

AI Technical Summary

Problems solved by technology

The unavoidable problem in the ordinary high-toughening resin preparation method is that on the one hand, the toughness needs to be improved, and the thermoplastic content needs to be increased in a large amount; The preparation process (film formation) and prepreg use process (stickiness) have brought great difficulties

[0005] Based on the above problems, high-toughness resin systems are mainly used at home and abroad. The main methods are: 1) Use intrinsically high-toughness epoxy resin and the corresponding high-toughness structure as the curing agent for the skeleton, and at the same time, melt into thermoplastics to ensure manufacturability or rubber, but this method requires special raw materials, which not only increases the cost, but also brings supply problems for a large number of engineering applications; Thermoplastic content, improve toughness, such as the 977-20 system is to use this method, the biggest disadvantage of this method is to reduce the fiber volume content of the composite material, and sacrifice the mechanical properties of the composite material; 3) Using the microcapsule method, the thermoplastic Plastic powder or rubber is wrapped in the capsule core. Although this method can improve the toughness, the improvement of toughness is limited by the content of microcapsules, and the heat resistance may be reduced due to the impact of the capsule shell.