Polyacrylonitrile polymer, process for production of the polymer, process for production of precursor fiber for carbon fiber, carbon fiber, and process for production of the carbon fiber

A technology of polyacrylonitrile and manufacturing method, which is applied in the field of carbon fiber precursor fiber and carbon fiber manufacturing, can solve the problems of low tensile level and small improvement effect of tensile modulus of elasticity, etc., and achieves excellent tensile strength and quality, and production Excellent performance in durability and processability

Inactive Publication Date: 2009-10-07
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the level of stretching is not high, and the effect of stretching to improve the tensile elastic modulus is also small

Method used

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  • Polyacrylonitrile polymer, process for production of the polymer, process for production of precursor fiber for carbon fiber, carbon fiber, and process for production of the carbon fiber
  • Polyacrylonitrile polymer, process for production of the polymer, process for production of precursor fiber for carbon fiber, carbon fiber, and process for production of the carbon fiber
  • Polyacrylonitrile polymer, process for production of the polymer, process for production of precursor fiber for carbon fiber, carbon fiber, and process for production of the carbon fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0246] 100 parts by weight of AN, 0.01 parts by weight of 2,2'-azobisisobutyronitrile (hereinafter sometimes abbreviated as AIBN) as a radical initiator, 1.5 parts by weight of partially saponified polyvinyl alcohol (polymerization degree 1000), and 290 parts by weight of water were mixed and put into a reaction vessel equipped with a reflux pipe and stirring blades. After replacing the space in the reaction vessel with nitrogen, heat treatment under the following conditions (referred to as polymerization condition A.) was carried out while stirring, and polymerization was carried out by aqueous suspension polymerization to obtain a PAN-based polymer.

[0247] (1) Heating from 30°C to 70°C (heating rate 120°C / hour)

[0248] (2) Keep at 70°C for 2 hours

[0249] The obtained PAN-based polymer powder was sufficiently washed with water and dried to obtain dry polymer A. Mz, Mw, and Mn of the obtained dry polymer A were 5.8 million, 3.4 million, and 1.4 million, respectively.

...

Embodiment 2

[0260] 3 parts by weight of dry polymer A obtained in Example 1 are uniformly dissolved in 270 parts by weight of dimethyl sulfoxide, and then mixed with 100 parts by weight of AN, 1 part by weight of itaconic acid, and 0.4 parts by weight as a free radical initiator 2,2'-Azobisisobutyronitrile and 0.3 parts by weight of n-octyl mercaptan as a chain transfer agent were uniformly dissolved and put into a reaction vessel equipped with a reflux tube and stirring blades. After the space in the reaction vessel was replaced with nitrogen, the above-mentioned polymerization condition B was heat-treated while stirring, and polymerized by the solution polymerization method to obtain a PAN-based polymer solution.

[0261] After adjusting the obtained PAN-based polymer solution to have a polymer concentration of 25% by weight, ammonia gas was blown in to pH 8.5 to neutralize itaconic acid and simultaneously introduce ammonium groups into the PAN-based polymer to prepare a spinning solutio...

Embodiment 3

[0263] 8 parts by weight of dry polymer A obtained in Example 1 are uniformly dissolved in 410 parts by weight of dimethyl sulfoxide, and then mixed with 100 parts by weight of AN, 1 part by weight of itaconic acid, and 0.4 parts by weight as a free radical initiator 2,2'-Azobisisobutyronitrile and 0.1 parts by weight of n-octyl mercaptan as a chain transfer agent were uniformly dissolved, and put into a reaction vessel equipped with a reflux tube and a stirring blade. After the space in the reaction vessel was replaced with nitrogen, heat treatment under the polymerization condition B was carried out while stirring, and polymerization was carried out by the solution polymerization method to obtain a PAN-based polymer solution.

[0264] After adjusting the obtained PAN-based polymer solution to a polymer concentration of 18% by weight, ammonia gas was blown in to pH 8.5 to neutralize itaconic acid and simultaneously introduce ammonium groups into the polymer to prepare a spinni...

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Abstract

The invention relates to a polyacrylonitrile-based polymer, containing a polymer of which main component is acrylonitrile, which satisfies at least one kind requirement selected from the following [a] to [d]. [a] Z-average molecular weight (Mz) determined by gel-permeation chromatograph is 800,000 to 6,000,000 and degree of polydispersity (Mz / Mw) (Mw denotes weight average molecular weight) is 3.0 to 10.0. [b] Z+1-average molecular weight (Mz+1) determined by GPC method is 3,000,000 to 10,000,000 and degree of polydispersity (Mz+1 / Mw) is 6.0 to 25.0. [c] Mzm determined by gel-permeation chromatograph[space]multi-angle laserlight scattering photometry is 400,000 to 1,000,000 and degree of polydispersity (Mzm / Mwm) is 3.0 to 10.0. [d] Z-average radius of gyration (Rz) determined by gel-permeation chromatograph[space]multi-angle laserlight scattering photometry is 25 to 45 nm and its ratio to weight average radius of gyration (Rz / Rw) is 1.3 to 2.5.

Description

technical field [0001] The present invention relates to a kind of high-quality carbon fiber precursor fiber (precursor fiber) and polyacrylonitrile polymer suitable for carbon fiber manufacture and its manufacturing method, and the manufacture of carbon fiber precursor fiber and carbon fiber using this polyacrylonitrile polymer solution method. Furthermore, the present invention relates to carbon fibers excellent in compressive strength and tensile elastic modulus, and a method for producing the same. Background technique [0002] Since carbon fiber has higher specific strength and specific elastic modulus than other fibers, as a reinforcing fiber for composite materials, in addition to current sports applications or aerospace applications, it is also used in automobiles, civil engineering, construction, and pressure vessels. It is widely used in general industrial applications such as windmill blades, etc., and it is required to further improve productivity or stabilize pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F20/44D01F6/18D01F6/54D01F9/22
CPCC08F20/44D01F9/22D01F6/18D01F6/54Y10T428/2918C08L33/20
Inventor 田中文彦远藤真冲岛勇纪
Owner TORAY IND INC
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