Method for preparing urea compound modified melamine fibers by copolymerization

A melamine fiber, aldehyde compound technology, applied in the direction of single-component synthetic polymer rayon, synthetic polymer rayon chemical post-treatment, fiber chemical characteristics, etc., can solve the obstacles to the preparation of melamine fiber, melamine functionality High, short resin storage time, etc., to achieve the effects of good spinnability, optimized flame retardancy, and improved thermal and mechanical properties

Inactive 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 disadvantages such as high functionality and high cross-linking degree. It is not easy to synthesize or the resin has a short storage time after synthesis, which hinders the preparation of melamine fibers. How to further improve the performance of melamine fibers has become a research focus.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The method for preparing urea compound modified melamine fiber by copolymerization in this embodiment is as follows:

[0021] (1) Divide the PVA aqueous solution with a mass fraction of 3wt% into two equal parts, add melamine, formaldehyde and sodium hydroxide to one part, and react at pH 7.4 and 50 °C for 0.4h. The molar ratio of melamine and aldehydes is 1:0.7, the mass ratio of polymer to melamine is 1:0.1, and the melamine resin solution is obtained;

[0022] (2) Add urea and formaldehyde (molar ratio 1:0.7) to the other part, the mass ratio of polymer to urea compound is 1:0.1, then add sodium hydroxide aqueous solution, adjust the pH value to 7.5, and react at 45°C 0.5h, obtain modified melamine resin solution;

[0023] (3) After mixing the two solutions, add sodium hydroxide to adjust the pH value to 7.4, and react at 40°C for 0.4h to obtain a modified melamine spinning solution;

[0024] (4) The resulting spinning solution is wet-spun, using saturated sodium s...

Embodiment 2

[0027] The method for preparing urea compound modified melamine fiber by copolymerization in this embodiment is as follows:

[0028] (1) Divide the 19wt% PEG aqueous solution into two equal parts, add melamine, glutaraldehyde and potassium hydroxide to one part, and react for 10 h at pH 11 and 95 °C, melamine and aldehydes (with aldehyde groups The molar ratio of the amount of substance) is 1:5, and the mass ratio of polymer to melamine is 1:10 to obtain a melamine resin solution;

[0029] (2) Add urea and glutaraldehyde (based on the amount of aldehyde group-containing substance) to another part (molar ratio is 1:4), and the mass ratio of polymer to urea compound is 1:9, and then add hydroxide Potassium aqueous solution, adjust the pH value to 10.5, and react at 95°C for 8 hours to obtain a modified melamine resin solution;

[0030] (3) After mixing the two solutions, add potassium hydroxide to adjust the pH value to 10.5, and react at 95°C for 8 hours to obtain a modified m...

Embodiment 3

[0034] The method for preparing urea compound modified melamine fiber by copolymerization in this embodiment is as follows:

[0035] (1) Divide 12wt% polyvinyl formal aqueous solution into two identical parts, add melamine, acetaldehyde and triethanolamine to one part, react at pH 8 and 85°C for 4 hours, melamine and aldehydes (with aldehydes) The molar ratio of the base substance) is 1:3, and the mass ratio of polymer to melamine is 1:4 to obtain a melamine resin solution;

[0036] (2) Add biuret and acetaldehyde (based on the amount of aldehyde group-containing substance) to the other part (molar ratio is 1:4), the mass ratio of polymer to urea compound is 1:9, and then add three Ethanolamine aqueous solution, adjust the pH value to 8.5, and react at 75°C for 4 hours to obtain a modified melamine resin solution;

[0037] (3) After mixing the two solutions, add potassium hydroxide to adjust the pH value to 8.5, and react at 65°C for 3 hours to obtain a modified melamine spin...

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Abstract

The invention discloses a method for preparing urea compound modified melamine fibers by copolymerization; the method comprises the steps of adding melamine and aldehydes to one high-molecular aqueoussolution, adding urea compounds and aldehydes into the other high-molecular aqueous solution, and then adding alkaline catalysts respectively to allow to react for different periods of time; mixing,adding alkaline catalysts for continuous reaction, carrying out wet spinning, heating, and curing to obtain the modified melamine fibers. The modified melamine fibers are prepared through wet spinning, and are used as three-dimensional cross-linked fibers, having the advantages of flame retardance, heat insulation, no molten drop, low smoke and no toxicity upon burning, low cost, good synthesis simplicity and the like.

Description

technical field [0001] The invention belongs to the field of preparation of special fibers, and specifically relates to a method for preparing urea compound-modified melamine fibers by copolymerization, and a preparation method for obtaining modified melamine fibers by wet spinning and thermal curing. Background technique [0002] Melamine resin fiber is a new type of high temperature resistant flame retardant fiber, it does not melt, does not drip, basically does not shrink or shrinks very little when exposed to fire, its limiting oxygen index is higher than 30, and its thermal decomposition temperature is about 400°C [He Peng, Qi Lu . Research on properties of modified melamine resin fibers[J]. Polymer Materials Science and Engineering, 2016, 23(01).]. Melamine is cheap and has been widely used in some high-temperature fields. However, melamine has disadvantages such as high functionality and high degree of cross-linking. It is not easy to synthesize or the resin has a sh...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): D01F6/78D01F11/08C08G12/40
CPCD01F6/78D01F11/08C08G12/40
Inventor焦明立李洁杨凯贾万顺张啸梅刘英
OwnerZHONGYUAN ENGINEERING COLLEGE