Preparation method of epoxy resin system for nanometer modified carbon fiber prepreg

Abstract

The invention discloses a preparation method of an epoxy resin system for a nanometer modified carbon fiber prepreg. The preparation method comprises the following steps: uniformly mixing a nanometer material with solid particles including a curing agent, an accelerant and the like in liquid bis-phenol A epoxy resin by a grinding method of a three-roller grinder to prepare a mixture A; and preparing the epoxy resin system for the carbon fiber prepreg by using the mixture A as the material to melt and co-extrude with solid bis-phenol A epoxy resin under 40 DEG C-100 DEG C. Firstly, the nanometer material is uniformly pre-mixed in the liquid epoxy resin by the grinding method of the three-roller grinder, and then secondary dispersion is carried out. According to the preparation method of the epoxy resin system for the nanometer modified carbon fiber prepreg disclosed by the invention, not only can the use of an volatile organic solvent be avoided, but also the better dispersion effect of the nanometer material in an epoxy resin base body can be achieved, and therefore, the process is relatively environment-friendly, and the harms to the body of a worker are smaller. Moreover, the nanometer material is good in dispersion effect, simple in process, high in efficiency and convenient for being applied to modifying and preparing the epoxy resin system for the carbon fiber prepreg in a large scale.

Description

technical field [0001] The invention relates to a carbon fiber prepreg technology, in particular to a method for preparing an epoxy resin system for nano-modified carbon fiber prepreg. Background technique [0002] Carbon fiber composite materials have excellent properties such as high specific strength and specific modulus, good thermal conductivity and electrical conductivity, high dimensional stability, light weight, corrosion resistance and electromagnetic shielding, so they are widely used in aerospace, military, industrial and sports equipment, etc. The field is a national strategic advanced composite material. At present, the preparation of carbon fiber composite materials mostly uses thermosetting epoxy resin as the matrix, and its typical representative is to use carbon fiber reinforced epoxy resin-based prepreg as the intermediate raw material, which has been widely used in the preparation of bicycles, fishing rods, golf clubs and other equipment. . The melt fil...

AI Technical Summary

Problems solved by technology

However, when nanomaterials are applied, they often encounter key technical problems that are difficult to disperse uniformly. To solve this problem, it is often necessary to add solvents such as acetone, alcohol or water, and then disperse them by assisting ultrasonic methods.

However, the disadvantage of this method is that it needs to add a solvent, which causes problems such as harsh operating environment and environmental pollution. It is difficult to remove the solvent in subsequent applications, the energy consumption is high, and the process is complicated. Especially when preparing composite materials, it is limited by the molding process, which is not convenient. The preparation of large-volume products in large quantities severely limits the application of nanomaterials

Especially when nano-modified epoxy resin is still widely used, it is the method of using solvent, which is difficult to realize in the process of preparing carbon fiber prepreg by melting adhesive film method, and the cost is high, so it is not easy to popularize.