Ribbon-shaped polyacrylonitrile carbon fiber and preparation method thereof
A polyacrylonitrile carbon fiber, polyacrylonitrile technology, applied in the chemical characteristics of fibers, stretch spinning, textiles and papermaking, etc., can solve the problem of large demand for carbon fibers of large size, etc., to improve production efficiency, reduce time, shorten Effect of Diffusion Path
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Embodiment 1
[0042] Mix acrylonitrile, methyl acrylate, itaconic acid with the solvent dimethyl sulfoxide (DMSO), add the initiator azobisisobutyronitrile (AIBN) to carry out acrylonitrile solution copolymerization, in which the input copolymerized monomer In terms of the total mass of the polymer, put monomers and comonomers into the polymerization kettle according to the ratio of 97.2% of acrylonitrile, 1.6% of methyl acrylate and 1.2% of itaconic acid, and then add DMSO solvent to control the proportion of monomer acrylonitrile in the total amount of the polymerization system. 22% of the mass, reacted at a temperature of 65°C for 24 hours, and the resulting polymerization solution was stored at 60°C for wet spinning after de-monolysis and degassing, and the polymer spinning solution was passed through a metering pump, a candle filter, a belt Spinneret with spinneret holes, the number of spinneret holes is 22, the hole diameter is 0.05×0.4mm (W×L), the spinning solution passes through the...
Embodiment 2
[0044] According to the polymerization formula of Example 1, the materials were fed into the polymerization tank, and the same process conditions were used to carry out polymerization reaction, single removal and defoaming to obtain the spinning solution. Spinning, coagulation, primary drafting, washing, oiling, drying and densification according to Example 1, the fibers after drying and densification are drawn 2.41 times through superheated steam for a second time, and obtained polyacrylonitrile precursor through heat setting . Under the air atmosphere, the raw silk was pre-oxidized in six pre-oxidation furnaces with temperatures of 220, 230, 240, 250, 260 and 270°C, and the pre-oxidation time was 80 minutes; under nitrogen atmosphere, the temperatures were respectively 350, 450, and 800°C three-temperature zone low-temperature carbonization furnace treatment; under nitrogen atmosphere, the temperature was respectively 1100, 1600°C two-temperature zone high-temperature carbon...
Embodiment 3
[0046] According to the polymerization formula of Example 1, the materials were fed into the polymerization tank, and the same process conditions were used to carry out polymerization reaction, single removal and defoaming to obtain the spinning solution. Spinning, coagulation, primary drafting, washing, oiling, drying and densification according to Example 1, the fibers after drying and densification are drawn 2.50 times through superheated steam for a second time, and obtained polyacrylonitrile precursor through heat setting . The raw silk is subjected to pre-oxidation treatment in six pre-oxidation furnaces with temperatures of 220, 230, 240, 250, 260 and 270°C under air atmosphere, and the pre-oxidation time is 70 minutes; under nitrogen atmosphere, the temperatures are respectively 350, 450, and 800°C three-temperature zone low-temperature carbonization furnace treatment; under nitrogen atmosphere, the temperature was respectively 1100, 1600°C two-temperature zone high-te...
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