Pre-oxidation method for preparation of large-tow carbon fiber
A large-tow carbon fiber and pre-oxidation technology, which is applied in the fields of fiber chemical characteristics, textiles and papermaking, can solve the problems of less research on key technologies of large-tow carbon fiber processing, and achieve a good guiding effect
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[0008] Example 1:
[0009] The PAN copolymer fiber (the tow is 24K, the copolymer composition (wt%)) is: acrylonitrile (AN): Methyl acrylate (MA): Itaconic acid (IA)=96:2.0:2.0), in air medium, using 225℃, 240℃, 255℃ three-stage pre-oxidation furnace treatment, temperature gradient 15℃, oxidation furnace The internal circulation wind speed is 6m / s, the residence time is 80min, the draft ratio is 0%, and the density is 1.35g / cm 3 For pre-oxidized fiber, the pre-oxidized fiber is carbonized at 300~900℃ for 3min at low temperature under the protection of nitrogen, and +1% draft ratio is applied; at 1000~1500℃, 4% draft ratio is applied, high temperature Carbonize for 3 minutes to obtain large tow carbon fiber. The prepared carbon fiber was glued and cured into strips with epoxy resin E44 / acetone / triethylenetetramine (10:15:1) liquid, and then the mechanical properties of the corresponding carbon fiber samples were tested according to the national standard GB / T3362-2005. The results...
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[0010] Example 2:
[0011] Adopt 24KPAN copolymer fiber produced by Weihai Expansion Fiber Co., Ltd., adopt three-stage pre-oxidation furnace treatment at 230℃, 243℃, and 256℃. The temperature gradient is 13℃. The circulating air velocity in the oxidation furnace is 7m / s and the residence time is 65min. The draft ratio is 1%, and the density is 1.36g / cm 3 The other process parameters and operations of the pre-oxidized fiber are the same as in Example 1, and large tow carbon fibers are obtained. The results are shown in Table 1.
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[0012] Example 3:
[0013] The 24KPAN copolymer fiber produced by Weihai Expansion Fiber Co., Ltd. is processed in a three-stage pre-oxidation furnace at 220°C, 237°C, and 254°C. The temperature gradient is 17°C, the circulating air velocity in the oxidation furnace is 4m / s, and the residence time is 75min. The draft ratio is 0%, and the density is 1.34g / cm 3 The other process parameters and operations of the pre-oxidized fiber are the same as in Example 1, and large tow carbon fibers are obtained. The results are shown in Table 1.
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