Method for improving dissolving property of high molecular weight polyacrylonitrile produced by dry method

A technology of polyacrylonitrile and high molecular weight, which is applied in the direction of single-component synthetic polymer rayon, spinning solution preparation, textiles and papermaking, etc. It can solve the problems of poor solubility of high molecular weight polyacrylonitrile and achieve improved solubility , the effect of solving the difficulty of dissolution

Active Publication Date: 2022-05-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for improving the solubility of high-molecular-weight polyacrylonitrile produced by a dry process, which is easy to implement, solves the problem of poor solubility of high-molecular-weight polyacrylonitrile under the premise of ensuring a high solution concentration, and improves the spinning process. The stability of the silk process improves the product quality

Method used

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  • Method for improving dissolving property of high molecular weight polyacrylonitrile produced by dry method
  • Method for improving dissolving property of high molecular weight polyacrylonitrile produced by dry method

Examples

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Effect test

Embodiment 1

[0030] Weigh 50g of DMAC and 30g of DMF, slowly heat up to 65°C, add 43g of polyacrylonitrile powder with a weight average molecular weight of 200,000, stir at a speed of 150rpm, after stirring for 20min, slowly add 20g of DMSO, and heat up to 80°C, It was prepared as a homogeneous solution with a concentration of 30%, its viscosity was measured, and a spinning test was carried out.

Embodiment 2

[0032] Weigh 50g of DMAC and 30g of DMF, slowly heat up to 65°C, add 43g of polyacrylonitrile powder with a weight-average molecular weight of 250,000, stir at a speed of 150rpm, after stirring for 20min, slowly add 20g of DMSO, and heat up to 80°C. It was prepared as a homogeneous solution with a concentration of 30%, its viscosity was measured, and a spinning test was carried out.

Embodiment 3

[0034] Weigh 60g of DMAC and 30g of DMF, slowly heat up to 65°C, add 43g of polyacrylonitrile powder with a weight-average molecular weight of 200,000, stir at a speed of 200rpm, after stirring for 20min, slowly add 10g of DMSO, and heat up to 80°C and continue Stir for 40 minutes, configure it into a homogeneous solution with a concentration of 30%, measure its viscosity, and conduct a spinning test.

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Abstract

The invention relates to the technical field of high molecular weight polyacrylonitrile, in particular to a method for improving the solubility of high molecular weight polyacrylonitrile produced by a dry method. The method for improving the dissolving property of the high molecular weight polyacrylonitrile produced by the dry method comprises the following steps: mixing solvents dimethylacetamide and dimethylformamide, heating to a set temperature, then adding polyacrylonitrile powder into the mixed solvent, stirring for dissolving, then adding a dimethyl sulfoxide solvent, heating to 65-80 DEG C, stirring for 1-2 hours, and cooling to room temperature to obtain the high molecular weight polyacrylonitrile. The uniform polyacrylonitrile solution is formed. The method for improving the solubility of the high-molecular-weight polyacrylonitrile produced by the dry method is easy to implement, solves the problem of poor solubility of the high-molecular-weight polyacrylonitrile on the premise of ensuring higher concentration of the solution, improves the stability of a spinning process and improves the product quality.

Description

technical field [0001] The invention relates to the technical field of high-molecular-weight polyacrylonitrile, in particular to a method for improving the solubility of high-molecular-weight polyacrylonitrile produced by a dry process. Background technique [0002] In the production process of dry acrylic fiber spinning, it is necessary to dissolve the polyacrylonitrile powder first. The rheology of the spinning stock solution, especially the viscosity of the stock solution is one of the important factors in the spinning process. The degree of dissolution of the polymer is related to the Spinning quality is closely related. During the dissolution process, the temperature of the single solvent is first raised to a certain temperature, and then the powder is slowly added in the state of stirring. In the current dissolution process, a "white core" will appear in the dissolution system for a long time, and the outer surface of the agglomerated "white core" has swelled, "wrappi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/18D01D1/02
CPCD01F6/18D01D1/02Y02P70/62
Inventor 车万里郭卫东严婕袁锦慧
Owner CHINA PETROLEUM & CHEM CORP
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