Preparation method of polyacrylonitrile spinning solution

A polyacrylonitrile spinning and acrylonitrile technology, which is applied in the direction of single-component synthetic polymer rayon, textiles and papermaking, fiber chemical characteristics, etc., can solve the problems of copolymer hydrophilicity decline, etc., and achieve narrow molecular weight distribution, Good hydrophilicity, easy to control the effect

Active Publication Date: 2010-10-20
KINGFA SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after itaconate monomethyl esterification, the hydrophilicity of the copolymer will decrease

Method used

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  • Preparation method of polyacrylonitrile spinning solution
  • Preparation method of polyacrylonitrile spinning solution
  • Preparation method of polyacrylonitrile spinning solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] With 10kg acrylonitrile, 40kg dimethyl sulfoxide, 100g itaconate monomethyl ammonium compound (R 1 =1) Add it to a 100L reaction kettle, raise the temperature of the still and static mixer jacketed circulating water to 60°C, and add 60g of azobisisobutyronitrile after passing nitrogen through the kettle for 30 minutes. The polymerization was stopped after 12 hours, and the obtained polymer had a molecular weight of 150,000 and a molecular weight distribution of 2.5.

Embodiment 2

[0030] With 10kg acrylonitrile, 40kg dimethyl sulfoxide, 40g itaconate monopropyl ammonium compound (R 1 =3) Add it into a 100L reaction kettle, raise the temperature of the jacketed circulating water of the kettle and the static mixer to 60°C, and add 60g of azobisisobutyronitrile after passing nitrogen in the kettle for 30 minutes. After 1 hour of polymerization, the remaining 60 g of comonomer was added in 3 times with an interval of 1 hour between each time to obtain a polymer with a molecular weight of 155,000 and a molecular weight distribution of 2.5.

Embodiment 3

[0032] With 10kg acrylonitrile, 40kg dimethyl sulfoxide, 40g itaconate monomethyl ammonium compound (R 1 =1) Add it into a 100L reaction kettle, raise the temperature of the still and static mixer jacket circulating water to 50°C, and add 60g of azobisisoheptanonitrile after passing nitrogen in the kettle for 30min. After 1 hour of polymerization, the remaining 60 g of comonomer was added in 3 times with an interval of 1 hour between each time, and the reaction was stopped after 12 hours to obtain a polymer with a molecular weight of 165,000 and a molecular weight distribution of 2.3. The contact angle of the copolymer film with water is shown in Table 1.

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Abstract

The invention discloses a preparation method of a polyacrylonitrile spinning solution. The polyacrylonitrile spinning solution is a solution of a main monomer and a comonomer polymer, the main monomer is acrylonitrile with the mole content of 90-99.9%, and the comonomer is itaconic acid mono-methyl ester ammonium compound with the mole content of 0.1-10%. The quality of the polymer solution has direct influence on protofilament performance, and good hydrophily, narrow molecular weight distribution and relatively uniform chain structure are the necessary conditions for obtaining high-performance carbon fibre protofilament. Itaconic acid mono-methyl ester ammonium compound with stronger hydrophily is used for replacing itaconic acid mono-methyl ester as the comonomer, and the hydrophily of the obtained spinning solution is higher than that of the itaconic acid mono-methyl ester, so the problem of loose solidified filament structure caused by increased diffusion rate difference between solvent and nonsolvent in the fibre because the hydrophily of the spinning solution is reduced is avoided. The copolymerization and the polymer chain structure of the invention are relatively easier to control, so the polyacrylonitrile spinning solution with high carbon fibre mechanical properties can be obtained.

Description

technical field [0001] The invention relates to a method for preparing polyacrylonitrile spinning dope. Background technique [0002] High-performance polyacrylonitrile (PAN)-based carbon fiber is the most important and urgently needed key material for the development of advanced weapons and equipment, such as nuclear weapons, strategic missiles, satellites, aerospace vehicles, fighter planes and stealth weapons. Ocean development, transportation, civil construction and sporting goods are also widely used. In 2004, my country's import volume reached more than 4,000 tons, accounting for 1 / 5 of the world's total. [0003] After nearly 30 years of exploration and practice, domestic researchers have gradually realized that the backwardness of raw silk preparation level is the bottleneck restricting the development of carbon fiber in my country, and the preparation of high-performance spinning stock solution is the prerequisite for obtaining high-quality raw silk. [0004] In ord...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/48C08F222/22D01F6/18D01F9/22
Inventor 辛伟马雷宋威黄险波曾祥斌
Owner KINGFA SCI & TECH CO LTD
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