Surface-treated carbon fiber, surface-treated carbon fiber strand, and manufacturing method therefor
A technology of surface treatment and manufacturing method, which is applied to carbon fiber, a device for coating liquid on the surface, physical treatment, etc., can solve problems such as difficult industrialization, and achieve the effects of improving physical properties, uniform adhesion, and suppressing breakage
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Embodiment 1
[0130] The PAN fiber bundle as a precursor (single fiber fineness 1.05[dtex], single fiber number 24000) is subjected to refractory treatment in the atmosphere at 250-270°C until the fiber specific gravity reaches 1.34-1.36. Next, low-temperature carbonization is performed at 300 to 650° C. in a nitrogen atmosphere. Then, high-temperature carbonization was performed at 1300° C. under a nitrogen atmosphere to obtain a carbon fiber bundle. The physical properties of the resin-impregnated fiber bundle of the obtained carbon fiber bundle were: strength 4000 [MPa], elastic modulus 240 [GPa]. For the surface of the carbon fiber, use figure 1 The surface treatment device (the length of the opening of the blowing nozzle in the fiber conveying direction is 1.0 [mm], the width of the opening is 400 [mm], and the shortest distance between the blowing nozzle opening and the carbon fiber is 3.0 [mm]), In an atmosphere where the gas composition is nitrogen:oxygen=99.8:0.2, at normal press...
Embodiment 2-4
[0132] In the same manner as in Example 1, the surface treatment was performed by changing the linear velocity or the plasma output to the conditions described in Table 1. Table 1 shows various physical properties of the obtained surface-treated carbon fibers.
Embodiment 5-6
[0134] For the surface of the sintered carbon fiber produced by the same method as in Example 1, use figure 2 The surface treatment device shown (the distance between the electrodes is set to 3.0 [mm], and the carbon fiber is conveyed between them) is subjected to surface treatment under the conditions described in Table 1, and various physical properties of the obtained surface-treated carbon fiber are shown in Table 1. 1.
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