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A kind of preparation method of reinforcing fiber for special paper

A technology of reinforcing fiber and special paper, applied in the direction of fiber type, fiber treatment, fiber raw material treatment, etc., to solve the serious shortage, reduce the consumption, and improve the strength of the paper sheet

Active Publication Date: 2016-08-24
ZHEJIANG HENGDA NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a preparation method of reinforcing fiber for special paper, which is environmentally friendly, and the prepared reinforcing fiber for special paper solves the compatibility problem between fibers, greatly improves the strength of the paper sheet and the PVA fiber in the paper fiber. Dispersion in medium, improve the wettability of fibers, and overcome the phenomenon of paper sticking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] The specific steps of the method for preparing the reinforcing fiber for special paper of the present invention will be described in detail below.

[0025] 1) In parts by mass, add 1 part of polyvinyl alcohol fiber and 50-100 parts of organic solvent into the reactor, stir well and add 0.2-1 part of 4-dimethylaminopyridine (high-efficiency acylation reaction catalyst) and 1 ~2 parts of triethylamine (acid-binding agent) shake well, place in ice-water bath, fill with N 2 To remove the air in the reactor, so that the resulting reaction system is in an oxygen-free environment; slowly drop into the reaction system an organic compound of an acylating agent mixed with 1.3-2.5 parts of an acylating agent and 6-12 parts of an organic solvent. Solution, the dropping time is controlled within 1~2h; then react in an ice-water bath and anaerobic environment for 2~4h, then raise the temperature to 20-40°C, and react for 12~48h to obtain a reaction solution containing the crude produ...

Embodiment 1

[0036] 1) According to the number of parts by mass, add 1 part of water-insoluble polyvinyl alcohol fiber and 50 parts of N-methylpyrrolidone into the reactor, stir well, add 0.5 part of 4-dimethylaminopyridine and 1 part of triethylamine and shake well , placed in an ice-water bath, filled with N 2 In order to remove the air in the reactor, the resulting reaction system is in an oxygen-free environment; slowly drop into the reaction system 2-bromo In the organic solution of isobutyryl bromide, the dropping time is controlled within 1 hour, then reacted in an ice-water bath and an oxygen-free environment for 3 hours, then heated up to 30°C, and reacted for 18 hours to obtain a reaction solution containing the crude product; The reaction solution was suction filtered, and then the obtained PVA fiber macromolecular initiator filter cake was washed alternately with ethanol and water to remove residual impurities on the fiber surface, and finally dried in a vacuum drying oven at 5...

Embodiment 2

[0040] 1) According to the number of parts by mass, add 1 part of water-soluble polyvinyl alcohol fiber and 80 parts of tetrahydrofuran into the reactor, stir well, add 0.8 part of 4-dimethylaminopyridine and 1 part of triethylamine and shake well, place In an ice water bath, filled with N 2 In order to remove the air in the reactor, the resulting reaction system is in an oxygen-free environment; slowly drop 2-bromoisobutyryl bromide formed by mixing 2.5 parts of 2-bromoisobutyryl bromide and 12 parts of tetrahydrofuran into the reaction system In the organic solution of bromine, the dropping time is controlled within 2 hours, then reacted in an ice-water bath and an oxygen-free environment for 4 hours, then heated up to 30°C, and reacted for 48 hours to obtain a reaction solution containing a crude product; pump the reaction solution containing a crude product filter, and then alternately wash the obtained PVA fiber macroinitiator filter cake with ethanol and water to remove ...

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Abstract

The invention relates to a preparation method of reinforced fiber for special paper. The preparation method comprises the following steps: evenly mixing a solvent, a PVA fiber macroinitiator, a water-soluble acrylic monomer, a methacrylic acid ester monomer, an acrylics monomer with functional groups, copper bromide, a copper bromide ligand, a sacrificial agent and 2-bromopropanoic acid ethyl ester, so as to obtain a reaction system; heating the reaction system to 35-45DEG C under an oxygen-free environment and performing grafting reaction for 4-6h, then carrying out suction filtration, washing a filter cake, filtering, and performing vacuum drying, so as to obtain reinforced fiber for special paper. The prepared polyvinyl alcohol fiber can partially replace paper fiber for paper making, and the mechanical strength and water resistance of the paper can be greatly enhanced.

Description

technical field [0001] The invention belongs to the field of papermaking, and relates to a method for preparing reinforcing fibers, in particular to a method for preparing reinforcing fibers for special paper. Background technique [0002] my country is a big non-wood fiber and recycled fiber papermaking country. The consumption of non-wood fiber and recycled fiber accounts for about 78%, and wood fiber only accounts for 22%. Non-wood fibers and regenerated fibers are short, low in strength, poor in water resistance, and contain a lot of chemical impurities, which not only seriously affect the quality of paper, but also cause serious "three wastes" pollution. Replacing paper fibers with chemical synthetic fibers with high performance and special functions can effectively improve the strength of paper sheets and overcome the bottleneck of severe shortage of high-grade paper fiber resources in China. Commonly used chemical fibers include polyvinyl alcohol (PVA) fibers, polyes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H13/16D06M14/10D06M13/355D06M13/328D06M101/24
Inventor 丁九斤姜文龙叶素芳方宏赵新民
Owner ZHEJIANG HENGDA NEW MATERIAL CO LTD
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