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Post-treatement method for PVA (polyvinyl alcohol) jelly glue fibre

A polyvinyl alcohol and fiber technology, which is applied in the field of post-treatment of PVA jelly fibers, can solve problems such as increased procedures, energy consumption, environmental pollution, and increased production costs, and achieves low solvent residual rate, good tensile performance, and reduced The effect of cost recovery

Inactive Publication Date: 2008-12-03
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the post-drawing of polyvinyl alcohol jelly spinning in the prior art, must adopt a large amount of extraction agents to remove the solvent in the jelly fiber, as in Chinese patent 93112363.1, use ethanol extraction to remove solvent ethylene glycol subsequently in Drying and high-stretching under certain conditions, the disadvantage of the above-mentioned technology is that the process and energy consumption are increased, and the extraction agent and solvent must be separated and recovered, which not only pollutes the environment, but also leads to an increase in production costs

Method used

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  • Post-treatement method for PVA (polyvinyl alcohol) jelly glue fibre

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Experimental program
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Effect test

Embodiment 1

[0023] PVA jelly fiber, polymerization degree 1750, PVA concentration 20%, diameter 2.5mm, solvent 40:60 water / dimethyl sulfoxide (DMSO) system, pre-stretching ratio 2 times, after hydraulic treatment, after two stages After washing and stretching, the stretching ratio is 2.5, and then sent to the continuous two-stage negative pressure extraction of the solvent in the fiber, the vacuum degree is maintained at 500Pa, after three dryings, it is stretched through a four-stage hot air oven, and the total stretching ratio is 12 times, and finally the fiber is wound to obtain the finished fiber. Fiber strength 11.5CN / dtex, modulus 260CN / dtex.

Embodiment 2

[0025] PVA jelly fiber, polymerization degree 1750, PVA concentration 20%, diameter 2.5mm, solvent 40:60 water / DMSO system, pre-stretching ratio 2 times, after hydraulic treatment, after two-stage washing and stretching, The stretching ratio is about 2.5, and then sent to the intermittent two-stage negative pressure extraction of the solvent in the fiber, the vacuum degree is maintained at 100Pa, after three dryings, it is stretched in a four-stage hot air oven, the total stretching ratio is 14, and finally the fiber roll Winding to get the finished fiber. Fiber strength 12CN / dtex, modulus 280CN / dtex.

Embodiment 3

[0027] The degree of polymerization is 1750, the concentration of PVA is 20%, the diameter is 2.5mm, the solvent is the water / DMSO system of 40:60, the pre-stretch ratio is 2 times, after the pressure-liquid treatment, after two-stage washing and stretching, the stretch ratio is 2.5 Then send the solvent in the continuous two-stage negative pressure extraction fiber, the vacuum degree is maintained at 1000Pa, the extracted fiber is dried in a hot air box, after three dryings, it is stretched in a four-stage hot air oven, and the total stretching ratio is 10. Finally, the fiber is wound to obtain the product fiber. Fiber strength 11CN / dtex, modulus 240CN / dtex.

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Abstract

The invention relates to a post-processing method of a polyvinyl alcohol PVA gel fiber, which comprises the following steps: firstly, pre-stretching and fiber washing are carried out; secondly, a solvent is extracted under the negative pressure and the vacuum conditions; and thirdly, multi-step drawing, design finalizing and coiling steps are carried out. The extraction method is replaced by the vacuum extraction method, thereby removing the solvent in the gel-spinning fiber. The post-processing method has the advantages of simple process, high equipment utilization rate, low solvent residual rate, good fiber tensile property, no harmful gas, solvent recycling under complete sealing condition, reutilization after recycling, etc., and reduces the recycling cost.

Description

technical field [0001] The invention belongs to the field of jelly fibers, in particular to a post-treatment method for PVA (polyvinyl alcohol) jelly fibers. Background technique [0002] In the post-stretching of polyvinyl alcohol jelly spinning in the prior art, must adopt a large amount of extraction agents to remove the solvent in the jelly fiber, as in Chinese patent 93112363.1, use ethanol extraction to remove solvent ethylene glycol subsequently in Drying and high-stretching under certain conditions, the disadvantage of the above technology is that it increases the process and energy consumption, and the extraction agent and solvent must be separated and recovered, which not only pollutes the environment, but also leads to increased production costs. Contents of the invention [0003] The purpose of this invention is to provide a kind of aftertreatment method of PVA (polyvinyl alcohol) jelly fiber, overcome the defective that adopts solvent extraction method, by ado...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D10/00D01D10/06D01D11/00D02J1/22D02J13/00
Inventor 王志鑫何唯平倪建华汤惠工王依民张杰
Owner DONGHUA UNIV
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