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Surface treatment of carbon fiber plasma improves hydrophilicity

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21 Oct,2020

Surface treatment of carbon fiber plasma improves hydrophilicity:

As an important fiber material, carbon fiber has high specific strength, high specific modulus, high temperature resistance, corrosion resistance and other excellent properties. It has been widely used in national defense and military industry, aerospace, weapons and equipment, transportation, biomedicine and other high-tech industries. But, as a result of carbon fiber is made of flake graphite crystallite organic fiber, such as along the fiber axial inclination of microcrystalline ink material, its surface is highly crystallization and non-polarity flake graphite layer structure, chemical inertness, lead to their table interface performance is poorer, the serious influence subsequent comprehensive performance of composite materials, is limited under the specific conditions of application, plasma surface treatment technology can improve the problem. At present, surface modification of carbon fiber has become an indispensable part in the process of carbon fiber production. Manufacturers such as Toray of Japan, Mitsubishi Rayon of Japan and Siguri of Germany have used surface modification as an important indicator of carbon fibre quality. Therefore, surface modification of carbon fiber to improve its surface hydrophilic properties is the key to the production and application of carbon fiber.

In the past few years, a great deal of research has been done on the surface modification of carbon fiber. Among these factors, improving the surface roughness and increasing the surface chemical functional groups are the keys to improve the surface interface properties of carbon fiber. The common methods of surface modification of carbon fiber include surface oxidation, surface coating, high-energy ray irradiation, supercritical fluid surface grafting and plasma surface modification. The electrochemical oxidation process has the characteristics of strong continuity of production and easy control of process conditions, which has been applied in industry. But it still USES a lot of chemicals, consumes a lot of energy, produces a lot of waste water and liquid, and is difficult to oxidize for high-modulus carbon fiber, requiring extended treatment time. Compared with the traditional plasma surface modification technology, it is the most widely used method with the advantages of clean environment protection, time saving and high efficiency. The working principle of plasma surface treatment mainly includes two aspects: on the one hand, free radicals and polar groups are formed on the fiber surface through active particles, so as to improve the free energy and wettability of the fiber surface; On the other hand, the surface area and surface roughness of the fiber are increased by etching to remove pollutants from the fiber surface.

The surface modification of carbon fiber in aqueous solution was carried out by surface treatment of atmospheric plasma cleaning machine, and the hydrophilic modification of carbon fiber surface slurry was carried out at the same time by using the interaction between active particles and water molecules in plasma.

Surface treatment of carbon fiber plasma improves hydrophilicity

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