Lignin epoxy resin/carbon fiber reinforced anti-aging composite material

Abstract

The invention provides a lignin epoxy resin / carbon fiber reinforced anti-aging composite material. The composite material is obtained by cross-linking and curing lignin epoxy resin and a carbon fibermaterial, and under the condition that the use quantity of carbon fibers is reduced by about 15%, the strength of the obtained composite material can still be higher than that of a conventional bisphenol A epoxy resin / carbon fiber composite material. A certain quantity of polyacrylate polymers with glycidyl ether groups are added in the preparation of the lignin epoxy resin, the affinity of the lignin epoxy resin and the carbon fibers is improved, the weather resistance of the obtained composite material is improved accordingly, the retention rate of the mechanical property strength of the composite material under a high-humidity and high-heat environment within 30 days is very high, and special requirements for working under the high-humidity and high-heat environment can be met. The lignin epoxy resin / carbon fiber reinforced anti-aging composite material has the advantages that the cost is reduced, raw materials are more environmentally friendly, and the composite material has the excellent weather resistance and is very suitable for industrial production and commercial popularization.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a lignin epoxy resin / carbon fiber reinforced anti-aging composite material, its preparation method and application. Background technique [0002] Carbon fiber is an inorganic fiber material with a carbon content of more than 90%. It has the advantages of low density, high specific strength, high specific modulus, high temperature corrosion resistance, and chemical stability. It is widely used in aerospace, automobiles, electronics, sporting goods, Medical equipment and other fields. Carbon fiber reinforced resin matrix composite material is one of the most important application fields of carbon fiber. It refers to the use of carbon fiber and matrix resin as raw materials, which are processed into material products that can meet the requirements of use through different processing methods. The choice of matrix resin largely determines the environmental resistance and ...

AI Technical Summary

Problems solved by technology

However, in the above method, in order to make the material achieve the required strength, a large amount of carbon fiber must be used, and the high price of carbon fiber restricts the development of the composite material

Moreover, the wettability of carbon fiber and epoxy resin is poor, the composite material is easy to delaminate and segregate, and the mechanical strength will decrease after long-term storage. In many fields that require relatively high weather resistance, its application is limited.

Disclosed in CN104774431A has changed a kind of epoxy resin / carbon fiber composite material, in order to increase the compatibility of carbon fiber and epoxy resin in this method, need carry out surface activation treatment to carbon fiber material with plasma, between carbon fiber and epoxy resin interface Although the compatibility has been improved, the activation treatment of carbon fibers will damage the material structure, thereby affecting the mechanical properties of the composite material, and this method is time-consuming and laborious, which will further increase the cost of the composite material, and is not suitable for industrialization.

However, due to the three-dimensional cross-network structure of lignin epoxy resin, its viscosity is high, the speed of flow and filling and the wetting ability are average, the compatibility and weather resistance of carbon fiber and epoxy resin in the obtained composite materials need to be further improved

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