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Surface treatment method of dry-jet wet-spinning high-modulus carbon fibers

A technology of surface treatment, dry spraying and wet spinning, applied in fiber treatment, carbon fiber, textiles and papermaking, etc., can solve the problems of inability to meet product performance index requirements, low improvement in interlaminar shear strength, etc., and achieve interlaminar shearing Increased strength, improved wash effect, reduced distance effect

Active Publication Date: 2022-02-25
ZHONGFU SHENYING CARBON FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is suitable for dry-jet wet-spun high-strength medium-mode carbon fibers with a modulus below 290GPa. For the surface treatment of dry-jet wet-spun carbon fibers with a higher modulus, the increase in interlayer shear strength is low, which cannot meet product performance indicators. Require

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  • Surface treatment method of dry-jet wet-spinning high-modulus carbon fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The dry-jet wet-spun high-modulus carbon fiber after graphitization treatment at 2150°C first undergoes three-stage electrolytic anodic oxidation surface treatment. The electrolyte is sulfuric acid, sodium hydroxide and ammonium bicarbonate in sequence. The concentrations were 5%, 2%, and 4% in sequence, the electrolyte temperature was 70°C, and the surface treatment time was 30s. Then it goes through four stages of water washing in which the liquid level of each water washing unit is increased by 8mm along the fiber running direction in turn, and the water washing temperature is 60°C. Then dry at 120°C by contact drying. Finally sizing and drying, winding. The tensile strength of the obtained carbon fiber was 5.45GPa, the modulus was 333GPa, the abrasion resistance was 1.4mg / 30m, and the interlaminar shear strength was 107MPa.

[0039] In this example, through the three-stage electrolytic oxidation anode surface treatment, the deep surface treatment of the dry-jet we...

Embodiment 2

[0041] The dry-jet wet-spun high-modulus carbon fiber after graphitization treatment at 2150°C first undergoes three-stage electrolytic anodic oxidation surface treatment. The electrolyte is sulfuric acid, sodium hydroxide and ammonium bicarbonate in sequence. The concentrations were 5%, 2%, and 4% in sequence, the electrolyte temperature was 70°C, and the surface treatment time was 30s. Then it goes through four stages of water washing in which the liquid level of each water washing unit is increased by 8mm along the fiber running direction in turn, and the water washing temperature is 60°C. Then dry at 120°C by contact drying. Finally sizing and drying, winding. The tensile strength of the obtained carbon fiber was 4.87GPa, the modulus was 332GPa, the wear resistance was 1.4mg / 30m, and the interlaminar shear strength was 112MPa.

[0042] In this example, under the same electrolyte concentration and current cabinet, by adopting three-stage electrolytic oxidation anode surfa...

Embodiment 3

[0044] The dry-jet wet-spun high-modulus carbon fiber after graphitization treatment at 2500°C first undergoes three-stage electrolytic anodic oxidation surface treatment. The electrolyte is sulfuric acid, sodium hydroxide and ammonium bicarbonate in sequence. The concentrations were 5%, 2%, and 4% in sequence, the electrolyte temperature was 70°C, and the surface treatment time was 30s. Then it goes through four stages of water washing in which the liquid level of each water washing unit is increased by 8mm along the fiber running direction in turn, and the water washing temperature is 60°C. Then dry at 120°C by contact drying method, and finally sizing, drying and winding. The tensile strength of the obtained carbon fiber was 5.10GPa, the modulus was 381GPa, the abrasion resistance was 1.8mg / 30m, and the interlaminar shear strength was 97MPa.

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Abstract

The invention discloses a surface treatment method for dry-jet wet-spinning high-modulus carbon fibers. The method comprises the following steps: electrolyzing the dry-jet wet-spinning high-modulus carbon fibers in a manner of connecting multiple stages of electrolytic cells in parallel, then washing the dry-jet wet-spinning high-modulus carbon fibers in a washing tank, and finally drying the dry-jet wet-spinning high-modulus carbon fibers in a contact drying manner. Based on the anodic oxidation surface treatment principle, the total resistance of a surface treatment section is reduced in a manner of connecting multiple stages of electrolytic cells in parallel, and the surface treatment electric quantity is increased to a greater extent within a safe voltage range; in the aspect of equipment layout, an up-and-down superposition mode is adopted, the occupied area is reduced, meanwhile, the distance of connecting wires is shortened, and the surface treatment electric quantity can be increased; and through matching of the electrolyte concentration, the temperature and the total electrolysis electric quantity, regulation and control of different surface treatment degrees of the high-modulus carbon fibers are achieved, and the method is suitable for preparing the dry-jet wet-spinning high-modulus carbon fibers needing higher surface treatment degrees.

Description

technical field [0001] The invention belongs to the technical field of carbon fiber surface modification, and relates to a surface treatment method of dry spray wet spinning high modulus carbon fiber. Background technique [0002] In addition to the characteristics of light weight, high modulus, and high environmental resistance, high-modulus carbon fibers are increasingly used as reinforcements in structural and functional composite materials that require high stiffness and high dimensional stability. Fields, such as the aerospace field with large acceleration loads and large temperature changes, and the field of space optical mirrors that require high precision and dimensional stability. However, compared with high-strength carbon fibers, high-modulus carbon fibers have a higher degree of graphitization and a larger surface crystallite size, which leads to problems such as high surface inertness and weaker binding ability with the matrix resin during application. A deeper...

Claims

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Application Information

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IPC IPC(8): D06M11/55D06M11/38D06M11/76C25D7/06C25D11/02D06M101/40
CPCD06M11/55D06M11/38D06M11/76C25D11/02C25D7/0607D06M2101/40
Inventor 张国良郭鹏宗刘高君裴怀周
Owner ZHONGFU SHENYING CARBON FIBER
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