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Production process for preventing discoloration of aramid polymerized size

A production process and slurry technology, applied in the direction of single-component synthetic polymer rayon, single-component polyamide rayon, fiber chemical characteristics, etc. Processing and other problems, to prevent discoloration and solve the effect of discoloration of slurry

Inactive Publication Date: 2016-10-26
SRO ARAMID HUAIAN CO LTD
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Problems solved by technology

There is excessive m-phenylenediamine in the slurry prepared through the above steps, and it will change color quickly when exposed to air. This slurry is not easy to store, and the second is not conducive to subsequent processing such as pulping and papermaking. If the problem of rapid discoloration is not solved, follow-up The yellowing problem of the product cannot be solved, such as the yellowing of fibers and insulating paper is very severe

Method used

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  • Production process for preventing discoloration of aramid polymerized size

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Embodiment Construction

[0015] as attached figure 1 Shown is a flow chart of a production process for preventing aramid polymerization slurry from discoloration according to the present invention. First, 1 part of m-phenylenediamine MPD is dissolved in a solvent of 10.92 parts of dimethylacetamide DMAC; then at -10 ° C Add 1.7 parts of isophthaloyl chloride IPC at 60°C for pre-polymerization; after polymerization, first add 2 parts of chain extender to extend the chain, and then add neutralizer Ca(OH)2 to synthesize acidic slurry, and the final pH value is controlled to 5 , and then add 0.5 parts of blocking agent to block the residual amino group of the above acidic solution. The blocking agent is acid or acid anhydride; during the above steps of reaction, control the temperature of the slurry to be lower than 70°C, and finally filter and defoam and apply it to spinning and pulping.

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Abstract

The invention relates to a production process for preventing discoloration of aramid polymerized size. The production process comprises the following steps: dissolving m-phenylene diamine in a dimethylacetamide solvent; adding isophthaloyl dichloride for polymerization; adding a chain extender for chain extending after polymerization; adding a neutralizer for neutralization to obtain an acidic size; then adding a sealing off agent in the acidic size to seal off residual amino groups in the acidic size; finally, carrying out filtration and defoaming, so as to obtain the aramid polymerized size which can be applied to spinning and pulping. According to the production process, the problem that as size discolors in a short term, and a product made of the size discolors in a long term, subsequent process and storage are difficult is solved. Therefore, the influence on the expansion of the application field of aramid is great.

Description

technical field [0001] The invention belongs to the field of preparation of spinning slurry, in particular to a production process for preventing discoloration of aramid polymerization slurry. Background technique [0002] At present, the preparation method of aramid 1313 slurry is: dissolving a certain amount of m-phenylenediamine in the solvent of dimethylacetamide, and then polymerizing by adding isophthaloyl chloride, and then adding a chain extender to extend the chain after reaching a certain viscosity , and then add a neutralizer to neutralize it into an alkaline slurry, which is then used for spinning and pulping after filtration and defoaming. There is excessive m-phenylenediamine in the slurry prepared through the above steps, and it will change color quickly when exposed to air. This slurry is not easy to store, and the second is not conducive to subsequent processing such as pulping and papermaking. If the problem of rapid discoloration is not solved, follow-up ...

Claims

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Application Information

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IPC IPC(8): C08G69/48C08G69/32D01F6/60
CPCC08G69/32C08G69/48D01F6/605
Inventor 钟洲车明国陈正平杨威王丽丽
Owner SRO ARAMID HUAIAN CO LTD
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