Microwave pre-oxidation technology for electric-control-type polyacrylonitrile protofilament

Abstract

The invention relates to the technical field of carbon fibers, in particular to a microwave pre-oxidation technology for the electric-control-type polyacrylonitrile protofilament. The technology comprises the steps that S1, a hydrolysis adhesive is blended into deionized water to form an adhesion solution; S2, the set amount of carbon black is mixed with the deionized water to form suspension liquid; S3, the polyacrylonitrile protofilament is soaked into the adhesion solution and taken out before being completely dried; S4, the polyacrylonitrile protofilament is soaked in the suspension liquid, and after dipping is performed for set time, the polyacrylonitrile protofilament is taken out and completely dried; S5, the polyacrylonitrile protofilament is conveyed into a microwave oxidation furnace for oxidation under the set condition. According to the microwave pre-oxidation technology, the surface of the polyacrylonitrile protofilament which does not absorb waves is coated with a carbonmaterial wave-absorbing substance, and the polyacrylonitrile protofilament can absorb the microwave through carbon black after entering the microwave oxidation furnace, so that the surface of the polyacrylonitrile protofilament obtains heat energy, thereby achieving pre-oxidation. By reasonably controlling the microwave power and pre-oxidation time, the pre-oxidation effect can be effectively controlled. Meanwhile, by reasonably controlling power supply, the cost of protofilament treatment can be effectively lowered during the pre-oxidation stage.

Description

technical field [0001] The invention relates to the technical field of carbon fibers, in particular to an electrically controlled polyacrylonitrile precursor microwave pre-oxidation process. Background technique [0002] Carbon Fiber (CarbonFibre) is a fibrous carbon material, and the carbon element in its chemical composition accounts for more than 90% of the total mass. Carbon fiber and its composite materials have a series of excellent properties such as high specific strength, high specific modulus, high temperature resistance, corrosion resistance, fatigue resistance, creep resistance, electrical conductivity, heat transfer and small thermal expansion coefficient, and they can be used as structural materials to carry loads , and can function as a functional material. Therefore, carbon fiber and its composite materials have developed very rapidly in recent years. [0003] There are many kinds of raw materials that can be used to make carbon fiber. According to its sour...

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Problems solved by technology

[0004] From the polyacrylonitrile precursor to the final carbon fiber forming layer, it takes nearly 100 minutes of pre-oxidation. The existing pre-oxidation process is a process that consumes a lot of carbon fiber costs, which seriously restricts the reduction of carbon fiber production costs.

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