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Method for preparing phenolic formaldehyde/melamine fibers by copolymerization

A melamine fiber and phenolic technology, applied in the field of phenolic/melamine fiber preparation, can solve the problems of high melamine functionality, hinder the preparation of melamine fibers, short resin storage time, etc. Simple and easy to connect, less toxic and harmful gases

Active Publication Date: 2020-01-21
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, melamine has the disadvantages of high functionality, high degree of crosslinking, poor toughness, difficulty in synthesis or short storage time of resin after synthesis; production by centrifugal spinning, low production efficiency and uneven fiber thickness
Thus hindering the preparation of melamine fiber, how to improve the performance of melamine fiber has become the focus of research

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The method that present embodiment prepares phenolic / melamine fiber by copolymerization is as follows:

[0024] Divide the 3wt% PVA aqueous solution into two identical parts, add melamine, formaldehyde and alkaline catalyst sodium hydroxide to one part at 50 ° C, the molar ratio of melamine and aldehydes is 1:0.7, the mass ratio of polymer PVA to melamine The ratio is 1:0.5, adding a basic catalyst to adjust the pH to 11, and reacting for 0.4h to obtain a melamine resin solution.

[0025] Add phenol and formaldehyde (molar ratio 1:0.7) to the other part at 45°C, the mass ratio of polymer PVA to phenol is 1:0.1, then add aqueous sodium hydroxide solution, adjust the pH value to 11.5 and react for 0.5h, A phenolic resin solution was obtained.

[0026] After mixing the melamine resin solution and the phenolic resin solution, adding sodium hydroxide at 40° C. to adjust the pH value to 12, and reacting for 0.4 h to obtain a phenolic / melamine solution. The resulting spinnin...

Embodiment 2

[0029] The method that present embodiment prepares phenolic / melamine fiber by copolymerization is as follows:

[0030] Divide the 20wt% PEG aqueous solution into two identical parts, add melamine, paraformaldehyde and basic catalyst triethanolamine to one part at 95 ° C, and the molar ratio of melamine and aldehydes (according to the amount of aldehyde group contained) 1:5, the mass ratio of polymer to melamine is 1:8, adding a basic catalyst to adjust the pH to 7.4, and reacting for 10 hours to obtain a melamine resin solution.

[0031] Add cardanol and paraformaldehyde (according to the amount of aldehyde group content) in another part at 96°C (molar ratio is 1:2), the mass ratio of polymer to cardanol is 1:6, and then Add triethanolamine, adjust the pH value to 7.5 and react for 5 hours to obtain a phenolic resin solution.

[0032] After mixing the two solutions, triethanolamine was added at 98°C to adjust the pH to 7.8, and reacted for 8 hours to obtain a phenolic / melamin...

Embodiment 3

[0035] The method that present embodiment prepares phenolic / melamine fiber by copolymerization is as follows:

[0036] Dissolve 10wt% polyvinyl formal in water and divide it into two identical parts. Add melamine, glutaraldehyde and basic catalyst calcium hydroxide, melamine and aldehydes (according to the content of aldehyde group) in one part at 45 ° C. The molar ratio of the polymer to melamine is 1:2, and the mass ratio of the polymer to melamine is 1:3. Add an alkaline catalyst to adjust the pH to 8, and react for 4 hours to obtain a melamine resin solution.

[0037] Another part was added chlorophenol and paraformaldehyde (according to the amount of aldehyde group content) at 46°C (molar ratio 1:1.5), the mass ratio of polymer to chlorophenol was 1:3, and then Add calcium hydroxide, adjust the pH value to 8.1 and react for 4 hours to obtain a phenolic resin solution.

[0038] After mixing the two solutions, add sodium hydroxide at 78°C to adjust the pH to 8.5, and react...

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Abstract

The invention discloses a method for preparing phenolic aldehyde / melamine fibers by copolymerization, which comprises the steps of adding melamine and aldehydes (a solution A) into one high-molecularaqueous solution, adding phenols and aldehydes (a solution B) into the other identical high-molecular aqueous solution, and allowing to react under alkaline conditions; blending the solution A and thesolution B, continuing to react until the reaction is over, spinning, thermally curing, and naturally cooling to obtain the phenolic aldehyde / melamine fibers. The phenolic aldehyde / melamine fibers prepared via the preparation method are used as three-dimensional cross-linked fibers, are as advantageous as phenolic fibers and melamine fibers in flame retardance, heat insulation, low smoke and toxicity upon burning, low cost, good mechanical properties, high temperature resistance and the like, and have a good application prospect.

Description

technical field [0001] The invention belongs to the field of preparation of special fibers, and in particular relates to a preparation method for preparing a spinning solution through copolymerization of phenolic compounds and melamine, wet spinning and thermal curing to obtain phenolic / melamine fibers with excellent performance. Background technique [0002] Flame retardant textiles are experiencing a rapid increase in demand as the need for fire safety increases. Phenolic materials have the advantages of heat resistance, flame retardancy, self-extinguishing, low smoke, flame penetration resistance, and no dripping in case of fire [Yin Jinjie, Dai Yinghua, Cui Xiangjia. Development of a new type of toughened flame-retardant phenolic resin foam[J]. Applied Chemical Industry, 2010 (2): 247-250.], the phenolic fiber prepared by using phenolic resin also has the characteristics of high carbon residue rate, high limiting oxygen index, good flame retardancy, etc., and does not bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/78C08G14/10
CPCD01F6/78C08G14/10
Inventor 杨凯焦明立李洁刁泉张啸梅曹健
Owner ZHONGYUAN ENGINEERING COLLEGE
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