High-performance carbon fiber reinforced polyamide composite material and preparation method thereof

Abstract

The invention discloses a high-performance carbon fiber reinforced polyamide composite material, which comprises the following components in percentage by weight: 60-85% of polyamide resin, 3-10% of flexibilizer and 10-30% of surface functionalized carbon fiber. The high-performance carbon fiber reinforced polyamide composite material has the beneficial effects that 1. the surface carboxyl functionalization of carbon fiber is realized, the surface structure of the carbon fiber is not damaged in the whole reaction process, the self mechanical property of the carbon fiber is not influenced, and the compatibility between the carbon fiber and a resin matrix can be improved by introducing the surface carboxyl functional group of the carbon fiber; and 2. the interface unsticking phenomenon caused by thermal expansion, water diffusion and other factors can be effectively prevented, and the carbon fiber reinforced polyamide composite material can be guaranteed to have high mechanical property conservation rate in an environment of high temperature and high humidity.

Description

technical field [0001] The invention relates to a high-performance carbon fiber reinforced polyamide composite material and a preparation method of the composite material. Specifically, the carboxyl-functionalized carbon fiber is combined with polyamide to prepare high-performance composite materials. Background technique [0002] Polyamide is a general term for a class of polymers that contain repeated amide groups (-CONH-) in the molecular chain formed by polycondensation or self-polymerization of diamines and dibasic acids or amino acid lactams. According to the number of carbon atoms contained in dibasic acids and diamines or amino acids in the synthetic monomers, polyamides can be divided into PA6, PA66, PA610, PA46, PA1010, PA612, PA1212, PA6T, PA9T, etc. Among them, PA6 and PA66 account for more than 90% of the total polyamide. Polyamide has excellent mechanical properties, thermal properties, chemical resistance, self-lubricating properties, optical properties, ele...

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Problems solved by technology

[0004] However, the surface of carbon fiber is chemically inert, and the compatibility with the resin matrix after the preparation of the composite material is relatively poor, resulting in the excellent performance of the composite material cannot be effectively exerted, so the surface of the carbon fiber needs to be modified before the preparation of the composite material. Chemical modification, chemical oxidation modification, ray irradiation modification and other methods generally use strong oxidizing substances or oxidize the surface of carbon fibers in a special environment to generate more polar functional groups on the surface of carbon fibers. Although the above methods can Effectively improve the compatibility between carbon fiber and resin matrix and increase the mechanical properties of composite materials, but the surface structure of carbon fiber is destroyed in a strong oxidative environment, and new defects are generated on the surface of carbon fiber, resulting in a certain degree of mechanical properties of carbon fiber Therefore, an ideal carbon fiber surface modification method is to increase the polar functional groups on the carbon fiber surface without changing the carbon fiber surface structure, so as to increase the interfacial bonding force between the carbon fiber and the resin matrix.

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