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Method for preparing copolymerized acrylonitrile high water-absorption fiber

A technology of copolymerized polyacrylonitrile fiber and copolymerized polyacrylonitrile, which is applied in the field of preparation of functional synthetic polymer materials, can solve the problems of poor shape retention, high cost, loss of physical-mechanical properties of fibers, etc., and is convenient for industrialization promotion and implementation. , The production process is simple, and the water absorption rate is controllable.

Inactive Publication Date: 2006-03-08
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although the above-mentioned superabsorbent fiber preparation methods have their own advantages and disadvantages, they have a common disadvantage: the obtained superabsorbent fiber becomes a gel after absorbing water and easily loses the original shape of the fiber, that is, the shape retention is not good, and the physical-physical properties of the fiber are lost or partially lost. Mechanical properties, it is difficult to effectively use it as a fiber material, especially as a textile material, and its preparation process is relatively complicated and the cost is high

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  • Method for preparing copolymerized acrylonitrile high water-absorption fiber
  • Method for preparing copolymerized acrylonitrile high water-absorption fiber

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preparation example Construction

[0011] The preparation method of the copolymerized acrylonitrile superabsorbent fiber of the present invention (hereinafter referred to as the preparation method) mainly includes two steps: firstly, the copolymerized acrylonitrile fiber is prepared, and then the obtained copolymerized acrylonitrile fiber is partially hydrolyzed to prepare the copolymerized acrylonitrile superabsorbent fiber. Described preparation method specifically comprises:

[0012] (1) prepare copolymerized acrylonitrile fiber, the mass ratio formula of its feeding intake is: acrylonitrile and methyl methacrylate monomer and latent crosslinking agent 100%; 0.8%, the acrylonitrile accounts for 75-85% of the total mass of monomers and latent cross-linking agents, and methyl methacrylate accounts for 5-15% of the total mass of monomers and latent cross-linking agents; The linking agent is one or more of N-methylolacrylamide, β-hydroxyethyl methacrylate, hydroxyethyl acrylate and hydroxypropyl acrylate, and th...

Embodiment 1

[0023] Acrylonitrile and methyl methacrylate are used as monomers, N-methylolacrylamide is used as latent crosslinking agent, and the content of N-methylolacrylamide is controlled at 5%, 7%, and 10% of the monomer and its total mass , 15%, with azobisisobutyronitrile as the initiator, the dosage is 0.5% of the total mass of the monomer and latent crosslinking agent, in dimethyl sulfoxide, under nitrogen protection, heating at 68-70°C and stirring Solution polymerization, wherein the monomer and latent crosslinking agent are 20% of the total mass of the system except the initiator, and the reaction time is 8h. After vacuum defoaming the obtained copolymer solution, use 40% dimethyl sulfoxide aqueous solution as the coagulation bath Wet spinning, 5-fold stretching in a boiling water bath, relaxation and heat setting in a boiling water bath to obtain copolymerized acrylonitrile fibers, then thermal crosslinking at 170°C for 10 minutes, hydrolysis with 20% NaOH solution for 3 minut...

Embodiment 2

[0036] The content of N-methylolacrylamide is designed to be 10% of the sum of the monomer and its mass, and the content of the initiator azobisisobutyronitrile is respectively 0.3%, 0.5%, and 0.3% of the total mass of the monomer and N-methylolacrylamide. 0.7%, 0.8%, the rest are the same as in Example 1, and four kinds of superabsorbent fibers can be obtained. The saturated water absorption rates of the four fibers tested were 52.0g / g, 54.5g / g, 45.5g / g, and 42.5g / g; the water retention rates were 85.5%, 87.5%, 80.0%, and 78.5%, respectively.

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Abstract

This invention relates to a preparation method for copoly acrylonitrile high water-absorption fibers including: 1, preparing copoly-acrylonitrile fiber with the following formal of the material massratio: 100% acrylonitrile, methyl acrylate monomers and potential crosslinker, initiator 0.3-0.8% of the gross mass of the monomer s and the cross linker, the acrylonitrile: 75%-85%, the methyl acrylate: 5-15% and the potential crosslinker: one or many of a N-methylolacrylamide, methacrylic acid beta-hdyroxyl ethyl, ethyl hydroxyl acrylate and propy1 hydroxy1 acylate in 0.3~0.8%. The materials are mixed and dissolved in DMSO to be added with the initiator and protected by N to be copolymerized for 6-10h under 60-80degC to get the acrylonitrile solution to be defoamed and stretched by wet spin to get copoly acrylonitrile fibers to be processed with boiling-water bath, hot-crosslinked under 130-180deg.C for 5-15min to be hydrolyzed, cleaned with weak acid, de watered and dried to get the fiber.

Description

field of invention [0001] The invention relates to a preparation method of a functional synthetic polymer material, specifically a preparation method of a post-crosslinking-hydrolysis type copolyacrylonitrile superabsorbent fiber, and the international patent classification number is intended to be Int.C1 7 .D01D 5 / 34. Background technique [0002] At present, there are two main methods for preparing superabsorbent fibers by using synthetic polymer materials: [0003] One is the hydrophilic polymer spinning method: for example, Arco Chemical Technology Company of the United States uses NaOH to neutralize (neutralization degree 55%) maleic acid-isobutylene copolymer aqueous solution, and obtains a fineness of 2 to 3 through dry spinning. It is a technology to obtain super absorbent fiber after cross-linking treatment at 180°C for 10 minutes from the primary fiber of denier. Its trade name is "Fibersorb" (polymer components and absorbent fibers produced therefrom, Le-Khac, P...

Claims

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Application Information

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IPC IPC(8): D01F6/38D06M14/10D02J1/22
Inventor 肖长发胡晓宇安树林贾广霞庄毅刘洪斌
Owner CHINA PETROLEUM & CHEM CORP
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