Preparation method of melamine modified urea formaldehyde fibers

A technology of modifying urea-formaldehyde and melamine, which is applied in the fields of fiber chemical characteristics, wet spinning method, single-component synthetic polymer rayon, etc., can solve the problems of fiber application that have not been reported, and achieve excellent spinnability, limit oxygen The effect of high index and high flame retardant safety

Active Publication Date: 2019-10-22
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As urea-formaldehyde plastics, wood adhesives, etc., urea-formaldehyde resin is widely used in the manufacture of furniture, household appliances, mechanical parts, electrical accessories, various buttons and cover plates, etc. It has developed rapidly due to its low price and good flame retardancy. There is no relevant report on the application of fiber

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The preparation method of the melamine modified urea-formaldehyde fiber of the present embodiment, the steps are as follows:

[0022] (1) Dissolve PVA in water to obtain a 1wt% PVA aqueous solution, divide it into two parts, add melamine, acetaldehyde and potassium hydroxide to one part, and react for 0.4h at pH 7.4 and 50°C, the moles of melamine and acetaldehyde The ratio is 1:0.7, in which the mass ratio of PVA to melamine is 1:0.1; the other part is added with urea and formaldehyde (molar ratio is 1:0.7), in which the mass ratio of PVA to urea is 1:0.2; then sodium hydroxide is added Aqueous solution, adjust the pH value to 7.5, react at 45°C for 0.5h; add hydrochloric acid after blending the two parts of the solution, adjust the pH value to 4.0, react at 40°C for 0.1h;

[0023] (2) Add calcium hydroxide aqueous solution again, adjust the pH value to 7.4, then add paraformaldehyde (the ratio of urea and paraformaldehyde added in step (1) is 1:0.3), react at 35°C for...

Embodiment 2

[0027] The preparation method of the melamine modified urea-formaldehyde fiber of the present embodiment, the steps are as follows:

[0028] (1) Dissolve PEG in water to obtain a 30wt% PEG aqueous solution, divide it into two parts, add melamine, formaldehyde and sodium hydroxide to one part, and react for 10 hours at a pH of 11 and 95°C. The molar ratio of melamine and formaldehyde is 1 : 1.9, wherein the mass ratio of PEG to melamine is 1: 4; the other part is added with urea and paraformaldehyde (molar ratio is 1:1.9), wherein the mass ratio of PEG to urea is 1:10; then potassium hydroxide aqueous solution is added , adjust the pH value to 10.5, and react at 95°C for 8 hours; after blending the two parts of the solution, add sulfuric acid to adjust the pH value to 6.9, and react at 95°C for 7 hours;

[0029] (2) Add sodium hydroxide aqueous solution again, adjust the pH value to 10.5, then add formaldehyde (the ratio of urea and formaldehyde in step (1) is 1:2), react at 95...

Embodiment 3

[0033] The preparation method of the melamine modified urea-formaldehyde fiber of the present embodiment, the steps are as follows:

[0034] (1) Dissolve polyvinyl formal in water to obtain a 20wt% polyvinyl formal aqueous solution, divide it into two parts, add melamine, glutaraldehyde and calcium hydroxide to one part, and react at pH 8.5 and 65 °C 4h, the molar ratio of melamine and glutaraldehyde is 1:1.3; the mass ratio of polyvinyl formal melamine is 1:3; the other part is added with urea and glutaraldehyde (molar ratio is 1:1.1), of which polyethylene The mass ratio of alcohol formal to urea is 1:5; then add triethanolamine, adjust the pH value to 8.5, and react at 90°C for 3h; after blending the two parts of the solution, add phosphoric acid to adjust the pH value to 5, and react at 85°C for 2h;

[0035] (2) Add potassium hydroxide aqueous solution again, adjust the pH value to 8.5, then add acetaldehyde (the ratio of urea and acetaldehyde added in step (1) is 1:0.5), ...

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Abstract

The invention discloses a preparation method of melamine modified urea formaldehyde fibers. The preparation method includes: adding melamine and aldehydes (solution I) into one macromolecule aqueous solution, adding urea and aldehydes (solution II) into another macromolecule aqueous solution, respectively adding alkaline catalysts to perform reaction for a certain period of time; mixing the solution I and the solution II, adding an acidic catalyst to continue the reaction, adding an alkaline catalyst and the rest of aldehyde compounds to perform reaction, spinning with a wet spinning frame after the reaction, heating and curing the as-spun fibers subjected to coagulating bath winding in a drying oven, naturally cooling, and taking out to obtain the modified urea formaldehyde fibers. The preparation method has the advantages that the modified urea formaldehyde fibers are prepared through wet spinning by reasonably designing the reaction process, and the fibers serving as three-dimensional crosslinked fibers are low in cost, flame-retardant, thermal-insulation, free of melting drops, nontoxic when being combusted, promising in application prospect and the like.

Description

technical field [0001] The invention belongs to the field of preparation of special fibers, and in particular relates to a preparation method of melamine-modified urea-formaldehyde spinning solution, wet spinning and thermal curing to obtain modified urea-formaldehyde fibers. Background technique [0002] The three-dimensional cross-linked fiber has the characteristics of intrinsic flame retardancy, heat insulation and high carbonization yield, and has potential application value in the fields of functional textiles, carbon fiber and activated carbon fiber. However, due to the different preparation methods and structural characteristics of cross-linked fibers and oriented fibers, the development of cross-linked fibers is extremely slow. [0003] Phenolic fiber is the first three-dimensional cross-linked organic fiber [Economy J, Clark R A. US patent, 3650102], the advent of the fiber broke the inherent concept that three-dimensional cross-linked resins cannot form fibers. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/78D01D5/06C08G12/38
CPCC08G12/38D01D5/06D01F6/78
Inventor 曹健焦明立杨凯李闪张啸梅李玉南宋梦李洁米立伟
Owner ZHONGYUAN ENGINEERING COLLEGE
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