Surface treatment method of dry-jet wet-spun carbon fibers

Abstract

The invention relates to a surface treatment method of dry-jet wet-spun carbon fibers, and belongs to the technical field of carbon fiber surface treatment. The dry-jet wet-spun carbon fibers with thecarbon content of more than 90% are subjected to electrochemical surface treatment with a graphite plate as a cathode, an ammonium bicarbonate aqueous solution with the molar concentration of 0.01-4mol / L as an electrolyte solution at the electrolytic temperature of 10-40 DEG C via a continuous electrochemical treatment device, the treatment time is controlled at 10-300 s, and the current densityis adjusted to 0.1-10 A*m<-2>, and the electrode spacing is 150-400 mm; after treatment, the product is washed with 100 DEG C water, sized by water-borne epoxy resin doped with 0.1-10 mass% of monodisperse nano-TiO2, and finally rolled up. After being treated by the method, the composite material has the interlayer shear strength increased, and at the same time, the tensile strength of the carbonfibers has no loss. In addition, nano-TiO2 not only plays a reinforcing role, but also improves the combination of the carbon fibers and resin.

Description

Technical field: [0001] The invention relates to a surface treatment method for dry-spraying and wet-spinning carbon fibers, in particular to a method for treating carbon fibers by using doped monodisperse nano-TiO 2 The water-based sizing agent can improve the interlaminar shear strength of composite materials without reducing the tensile strength of carbon fibers, and is green and pollution-free, and belongs to the technical field of carbon fiber surface treatment. Background technique: [0002] Carbon fiber is a new type of reinforcement material developed in modern times, and it is an ideal reinforcement that can be used as functional materials and structural materials. It has the advantages of low density and high strength, high modulus, low expansion coefficient, high temperature resistance, corrosion resistance, electrical conductivity and thermal conductivity, and shock absorption. Therefore, carbon fiber reinforced composite materials have excellent properties that ...

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Problems solved by technology

However, the preparation process of carbon fibers will go through the process of carbonization in high-temperature inert gas, and in this process, carbon elements will accumulate as non-carbon elements escape. This structure will lead to a decrease in the surface tension of carbon fibers and surface activity. Reduced, so untreated carbon fiber: less functional groups on the surface, not easy to compound with other polymers, thus greatly limiting its application

[0003] Judging from the current technology of carbon fiber surface treatment research, the research on wet spinning carbon fiber is relatively thorough from method to mechanism, and the methods are obviously diverse. Its surface is very smooth, and its surface is extremely inert. Its bonding performance with resin itself is lower than that of T300. Without surface treatment, they cannot play their due role at all.

However, the current research on the surface treatment of dry-jet wet-spun carbon fibers is very limited, and most of them are plasma treatment. Although plasma treatment has its unique advantages, the treated fibers have higher surface free energy and chemical properties. Unstable and more susceptible to environmental influences

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