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Preparation method of 35K carbon fiber precursor, precursor and carbon fiber

A technology of carbon fiber precursor and carbon fiber, which is applied in the fields of fiber chemical characteristics, spinneret assemblies, textiles and papermaking, etc. It can solve the problems of uneven single-filament fineness, decreased mechanical properties, and large number of laying fibers, and achieves a relatively The effect of uniform diffusion process, internal stress relief, and stable boiling water shrinkage

Active Publication Date: 2022-06-21
吉林碳谷碳纤维股份有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the application process of 12K varieties and 24K and 25K varieties in the civil field, it mainly reflects the problems of large number of laying pieces and low efficiency in the production process of prepreg laying
[0005] In the process of using in the main fields of wind power, mainly in the process of pultrusion board products, it is urgent to study a larger K number of tows, and the number of single filaments in the whole bundle needs to be increased by more than 40-50%. Inhomogeneity, resulting in the decline of mechanical properties

Method used

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  • Preparation method of 35K carbon fiber precursor, precursor and carbon fiber
  • Preparation method of 35K carbon fiber precursor, precursor and carbon fiber
  • Preparation method of 35K carbon fiber precursor, precursor and carbon fiber

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Experimental program
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Effect test

Embodiment 1

[0043] In the present embodiment, the following method is used to prepare 35K carbon fiber precursor:

[0044] (1) three monomers of acrylonitrile, methyl acrylate and itaconic acid are mixed by mass ratio 93:4:3 to obtain a mixture, the mixture of acrylonitrile, methyl acrylate and itaconic acid is continuously added in water, the water The weight ratio of the mixture to the mixture is 2.4:1, and the polymer is obtained by aqueous suspension polymerization. The intrinsic viscosity of the polymer is 0.22, and the weight-average molecular weight is 60,000. The chelating reaction is terminated by adding p-hydroxyanisole to the polymer. The amount of p-hydroxyanisole added is 0.01% of the mass of the polymer; the unreacted monomer is removed by a stripper, and then the salt and moisture in the wet solid polymer are removed by a water washing filter, and finally dried to obtain the product. powdered polymer;

[0045] (2) dissolving the powdery polymer in DMAC, the mass ratio of t...

Embodiment 2

[0050] In the present embodiment, the following method is used to prepare 35K carbon fiber precursor:

[0051] (1) three monomers of acrylonitrile, methyl acrylate and itaconic acid are mixed by mass ratio 99:0.2:0.8 to obtain a mixture, the mixture of acrylonitrile, methyl acrylate and itaconic acid is continuously added in water, and the water The weight ratio of the mixture to the mixture is 3.5:1, and the polymer is obtained by aqueous suspension polymerization. The intrinsic viscosity of the polymer is 0.20 and the weight average molecular weight is 80,000; the chelating reaction is terminated by adding p-hydroxyanisole to the polymer. The amount of p-hydroxyanisole added is 0.01% of the mass of the polymer; the unreacted monomer is then removed by a stripper, and then the salt and moisture in the wet solid polymer are removed by a water washing filter, and finally dried to obtain the product. powdered polymer;

[0052] (2) Dissolving the powdery polymer in DMAC, the mas...

Embodiment 3

[0057] In the present embodiment, the following method is used to prepare 35K carbon fiber precursor:

[0058] (1) three monomers of acrylonitrile, methyl acrylate and itaconic acid are mixed in a mass ratio of 97:2.9:0.1 to obtain a mixture, and the mixture of acrylonitrile, methyl acrylate and itaconic acid is continuously added in water, and the water The weight ratio of the mixture to the mixture is 1.8:1, and the polymer is obtained by aqueous suspension polymerization. The intrinsic viscosity of the polymer is 0.25, and the weight average molecular weight is 100,000. The chelating reaction is terminated by adding p-hydroxyanisole to the polymer. The amount of p-hydroxyanisole added is 0.01% of the mass of the polymer; the unreacted monomer is removed by a stripper, and then the salt and moisture in the wet solid polymer are removed by a water washing filter, and finally dried to obtain the product. powdered polymer;

[0059] (2) dissolving the powdery polymer in DMAC, t...

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Abstract

The invention relates to a preparation method of a 35K carbon fiber precursor, the precursor and a carbon fiber, the preparation method comprises the following steps: (1) acrylonitrile, methyl acrylate and itaconic acid are subjected to a water phase suspension polymerization reaction to obtain a polymer, the polymer is terminated through a chelation reaction, and then filtering and drying are performed to obtain a powdery polymer; (2) dissolving the powdery polymer in DMAC (dimethylacetamide) to prepare a spinning solution; (3) enabling the spinning solution prepared in the step (2) to pass through a spinneret plate with the hole number of 34500-35500, spraying at the speed of 15-48m / min, feeding into a coagulating bath, forming to obtain nascent fibers, and washing, oiling, drying, drafting and shaping the nascent fibers to obtain protofilaments; the pressure of the spinneret plate in the step (3) is 500-1000kPa, so that the CV value of the filament density of the monofilament passing through any spinneret plate hole is not more than 8.5%. The specific surface area of the fiber tow is increased by reducing the diameter of the monofilament, so that the phase diffusion process of the fine denier tow in the coagulating bath forming process is more uniform, the overall performance of the fiber is improved from the internal structure, and the method is suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of carbon fibers, and in particular relates to a preparation method of a 35K carbon fiber precursor, as well as the precursor and carbon fibers. Background technique [0002] Carbon fiber is a special fiber composed of carbon elements. It has the characteristics of high temperature resistance, friction resistance, electrical conductivity, thermal conductivity and corrosion resistance. Its shape is fibrous, soft, and can be processed into various fabrics. Because of its graphite microcrystalline structure is preferentially oriented along the fiber axis, it has a high strength and modulus. The density of carbon fiber is low, so the specific strength and specific modulus are high. The main use of carbon fiber is as a reinforcing material to be compounded with resin, metal, ceramic and carbon to manufacture advanced composite materials. Carbon fiber reinforced epoxy resin composites have the highest specific ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/38D01F9/22D01D4/02
CPCD01F6/38D01F9/22D01D4/02D01D4/025
Inventor 宋德武郭甲东姜彦波张海鸥李凯陈浩王辉毛炳淇陈海军赵云峰吕宏宇单鑫郎健慧王立伟鞠占辉魏璐瑶王宇
Owner 吉林碳谷碳纤维股份有限公司