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A kind of preparation method of cross-linked polyacrylonitrile fiber

A polyacrylonitrile fiber and irradiation technology, which is applied in fiber treatment, textiles and papermaking, physical treatment, etc., can solve the problems of polyacrylonitrile fiber strength reduction, improve crosslinking degree, weaken radiation oxidation degradation, weaken oxidation The effect of degree of degradation

Active Publication Date: 2016-05-11
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of cross-linked polyacrylonitrile fibers, thereby solving the problem that the strength of polyacrylonitrile fibers in the prior art is significantly reduced during aerobic radiation processing

Method used

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  • A kind of preparation method of cross-linked polyacrylonitrile fiber
  • A kind of preparation method of cross-linked polyacrylonitrile fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Irradiation

[0032] Put the polyacrylonitrile fiber sample into three irradiation tubes, evacuate to 100Pa, seal, and then pass oxygen to make the pressure reach 2×10 4 Pa, put in cobalt source and irradiate to 45kGy, 90kGy, 135kGy respectively at room temperature.

[0033] 2. Determination of gel content

[0034] Weigh 1g of the above-mentioned irradiated polyacrylonitrile fiber, wrap it with filter paper and put it into a net made of 100 mesh stainless steel. After weighing, immerse it in pure dimethyl sulfoxide solvent and dissolve it at 80°C for 24h ; Then use methanol to extract the sample for 12 hours, put the sample in a vacuum oven for 24 hours at 60°C, dry it for 24 hours, take it out and cool it to room temperature, and weigh it; then repeat the above steps until the quality of the sample does not change. Calculate the gel content according to formula (1).

[0035] 3. Heat treatment

[0036] 1g of the above-mentioned irradiated polyacrylonitrile fibers...

Embodiment 2

[0042] 1. Irradiation

[0043] Put the polyacrylonitrile fiber sample into three irradiation tubes, evacuate to 100pa, seal, and then feed oxygen to make the pressure reach 2×10 4 Pa, 1×10 5 Pa, 5×10 5 Pa, put in a cobalt source and irradiate to 90kGy at a dose rate of 0.5Gy / s at room temperature.

[0044] 2. Determination of gel content

[0045] Weigh 1g of the above-mentioned irradiated polyacrylonitrile fiber, wrap it with filter paper and put it into a basket made of 100-mesh stainless steel mesh. After weighing, immerse it in pure dimethyl sulfoxide solvent and dissolve it at 80°C 24h; then use methanol to extract the sample for 12h, put the sample in a vacuum oven at 60°C and dry for 24h, take it out and cool it to room temperature, and weigh it; then repeat the above steps until the quality of the sample no longer changes. Calculate the gel content according to formula (1).

[0046] 3. Heat treatment

[0047] 1 g of the above-mentioned irradiated polyacrylonitrile...

Embodiment 3

[0053] 1. Irradiation

[0054] Put the polyacrylonitrile fiber sample into the irradiation tube, evacuate to 100pa, seal it, and then feed oxygen to make the pressure reach 1×10 4 Pa and 1×10 6 Put Pa into the cobalt source and irradiate to 500kGy and 10kGy respectively at room temperature.

[0055] 2. Determination of gel content

[0056] Weigh 1g of the above-mentioned irradiated polyacrylonitrile fiber, wrap it with filter paper and put it into a basket made of 100-mesh stainless steel mesh. After weighing, immerse it in pure dimethyl sulfoxide solvent and dissolve it at 80°C 24h; then use methanol to extract the sample for 12h, put the sample in a vacuum oven at 60°C and dry for 24h, take it out and cool it to room temperature, and weigh it; then repeat the above steps until the quality of the sample no longer changes. Calculate the gel content according to formula (1).

[0057] 3. Heat treatment

[0058] 1g of the above-mentioned irradiated polyacrylonitrile fibers w...

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Abstract

The invention provides a method for preparing crosslinking polyacrylonitrile fibers. The method comprises the following steps that (1) the polyacrylonitrile fibers are put into an irradiation tube, (2) the irradiation tube is sealed and vacuumed, and oxygen is charged, (3) the irradiation tube containing the polyacrylonitrile fibers is arranged under a cobalt source to carry out room temperature irradiation treatment, and (4) the polyacrylonitrile fibers processed by the irradiation are taken out and heat treatment is carried out under inert atmosphere. According to the method for preparing the crosslinking polyacrylonitrile fibers through combination of aerobic irradiation and the heat treatment, the radiolytic oxydative degradation of the polyacrylonitrile fibers can be reduced obviously, and the crosslinking degree is improved. The gel content of the crosslinking polyacrylonitrile fibers obtained through the method is up to more than 80%. The mechanical properties, and the physical and chemical properties of the crosslinking polyacrylonitrile fibers are also improved greatly, the service life of the crosslinking polyacrylonitrile fibers for serving as adsorbing material base materials is prolonged greatly, and cost is saved.

Description

technical field [0001] The invention relates to the field of macromolecular materials, in particular to a preparation method of cross-linked polyacrylonitrile fibers. Background technique [0002] As an important technology that can adjust the properties of polymers, radiation processing technology is being used more and more widely. Due to the large molecular weight of polymers, usually composed of thousands or even tens of thousands of units, small chemical changes induced by radiation may also cause significant changes in the properties of polymer materials. The most important radiation effects of polymers are radiation crosslinking and radiation degradation. In most cases, the two processes occur at the same time, but there are major and minor differences, which mainly depend on the structure of the polymer and the conditions of irradiation and post-treatment. Radiation crosslinking is to bridge the polymer molecules together through bonds through irradiation to form a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M10/06
Inventor 王谋华吴国忠刘伟华张文礼张文发
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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