Method for preparing high toughness epoxy resin matrix by using heat fusion method

Abstract

The present invention relates to a method for preparing a high toughness epoxy resin matrix by using a heat fusion method. In the prior art, a viscosity of the high toughness thermosetting epoxy resin system prepared by the traditional method is excessively increased so as to cause substantially-increased difficulty of the subsequent processing process. Based on the problem in the prior art, after a main body epoxy resin is mixed, a curing agent is added under a suitable condition, a small particle size thermoplastic powder material is mixed to the main body epoxy resin at a suitable temperature, and grinding is adopted to uniformly mix the resin so as to complete uniformity. Compared to the traditional toughening method, the method of the present invention has the following characteristics that: the minimum viscosity of the resin matrix can be substantially reduced, placement of the corresponding prepreg can be improved, and manufacturability of the prepreg can be improved. With the present invention, manufacturability and placement of the heat fusion method high toughness epoxy resin prepreg are improved, and the prepreg can be applicable for high toughness epoxy resin matrix composite material structures applied in aerospace, high toughness epoxy resin matrix composite material structures applied in warships, weapons and other defense industries, and various civil high toughness composite materials.

Description

technical field [0001] The invention relates to a method for preparing a high-tough epoxy resin matrix by a hot-melt method, which belongs to the resin matrix preparation technology of composite materials. 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 a standard toughness resin, represented by 5208; the second generation is a medium toughened resin, represented by 8552; the...

AI Technical Summary

Problems solved by technology

The unavoidable problem in the ordinary high-toughening resin preparation method is that on the one hand, it is necessary to improve the toughness and increase the thermoplastic content in a large amount; Material preparation and other processes bring great difficulties

[0005] Based on the above problems, the existing foreign methods mainly include: 1) Using intrinsically high-toughness epoxy resin and the corresponding high-toughness structure as the curing agent for the skeleton, and melting thermoplastics or rubber to ensure manufacturability, but this This method requires special raw materials, which not only increases the cost, but also brings supply problems for a large number of engineering applications; 2) uses thermoplastic tow and carbon fiber to weave into fabrics and then prepregs or shapes, thereby increasing thermoplastic content and improving Toughness, such as the 977-20 system, uses this method. The biggest disadvantage of this method is that it reduces the fiber volume content of the composite material and sacrifices the mechanical properties of the composite material; 3) Using the microencapsulation method, thermoplastic powder or rubber Wrapped in the capsule core, although this method can improve 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; 4) Medium modulus carbon fiber is used for matching, thereby improving The toughness of composite materials is improved, such as the IM7 / M21 system, but at this stage, the domestic medium modulus carbon fiber has not completed the large-scale application, and the application of this method is also limited