A method for preparing melamine-modified urea-formaldehyde fiber by adding multiple times

A technology of melamine and modified urea-formaldehyde, applied in the direction of chemical characteristics of fibers, wet spinning, single-component synthetic polymer rayon, etc. Excellent performance and the effect of reducing free aldehyde content

Active Publication Date: 2022-01-21
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 and wood adhesives, 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

[0023] The method for preparing melamine-modified urea-formaldehyde fiber by multiple additions of the present embodiment, the steps are as follows:

[0024] (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, 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), wherein the mass ratio of PVA to urea is 1:0.2, and then sodium hydroxide aqueous solution is added , adjust the pH value to 7.5, react at 45°C for 0.5h; add hydrochloric acid to adjust the pH value to 4.0 after the two parts of the solution are blended, add urea at 40°C (accounting for 5% of the amount of urea added under alkaline conditions), and react for 0.1h ;

[0025] (2) Add calcium hydroxide aqueous solution again, adjust the pH value to 7.4, then ...

Embodiment 2

[0029] The method for preparing melamine-modified urea-formaldehyde fiber by multiple additions of the present embodiment, the steps are as follows:

[0030] (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, the mass ratio of PEG to melamine is 1:4; the other part is added with urea and paraformaldehyde (the 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, react at 95°C for 8 hours; add sulfuric acid to adjust the pH value to 6.9 after the two parts of the solution are blended, add urea (accounting for 50% of the amount of urea added under alkaline conditions) at 95°C, and react for 7 hours;

[0031] (2) Add sodium hydroxide aqueous solution again, adjust the pH value to 10...

Embodiment 3

[0035] The method for preparing melamine-modified urea-formaldehyde fiber by multiple additions of the present embodiment, the steps are as follows:

[0036](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 and melamine is 1:3; the other part is added with urea and glutaraldehyde (molar ratio is 1:1.1), in which polyethylene The mass ratio of alcohol formal and urea is 1:5; then add triethanolamine, adjust the pH value to 8.5, and react at 90°C for 3h; 25% of the amount of urea added under alkaline conditions), and reacted for 2 hours;

[0037] (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), react at 75°C ...

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Abstract

The invention discloses a method for preparing melamine-modified urea-formaldehyde fibers by adding multiple times, adding melamine and aldehydes (solution A), urea and aldehydes (solution B) respectively into two polymer aqueous solutions, and adding an alkaline catalyst respectively The reaction time is different; the A and B solutions are mixed and added with an acidic catalyst and a certain amount of urea to continue the reaction, and then a basic catalyst and the remaining aldehyde compounds are added to react, spinning, heating and curing to obtain modified urea-formaldehyde fibers. In the present invention, by rationally designing the reaction process, the spinnability of urea-formaldehyde molecules is improved, and the degree of cross-linking is increased. As a three-dimensional cross-linked fiber, the fiber has the advantages of low cost, flame-retardant fiber, heat insulation, no melting drop, and non-toxic combustion. ,with broadly application foreground.

Description

technical field [0001] The invention belongs to the field of preparation of special fibers, and specifically relates to a method for preparing melamine-modified urea-formaldehyde spinning solution by adding multiple times, wet spinning and thermal curing to obtain functional 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-l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/78D01D5/06C08G12/38
CPCD01F6/78D01D5/06C08G12/38
Inventor 焦明立杨凯刁泉喻国敏李闪张啸梅殷玉娜贾万顺李洁
Owner ZHONGYUAN ENGINEERING COLLEGE
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