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A kind of preparation method of phenolic modified urea-formaldehyde fiber

A technology for modifying urea-formaldehyde and phenols, which is applied in the fields of fiber chemical characteristics, textiles and papermaking, and single-component synthetic polymer rayon. High oxygen index, high flame retardancy and high safety effect

Active Publication Date: 2021-10-26
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

[0022] The preparation method of the present embodiment phenolic modified urea-formaldehyde fiber, the steps are as follows:

[0023] (1) Dissolve PVA in water to obtain a 1wt% PVA aqueous solution, divide it into two parts, add phenol, acetaldehyde and potassium hydroxide to one part, and react for 0.4h at pH 7.4 and 50°C, the moles of phenol and acetaldehyde The ratio is 1:0.7; the mass ratio of PVA to phenol 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; then add sodium hydroxide aqueous solution , 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, and react at 40°C for 0.1h;

[0024] (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 0.4h, Obtaining ...

Embodiment 2

[0028] The preparation method of the present embodiment phenolic modified urea-formaldehyde fiber, the steps are as follows:

[0029] (1) Dissolve PEG in water to obtain a 30wt% PEG aqueous solution, divide it into two parts, add p-cresol, formaldehyde and sodium hydroxide to one part, and react for 10 hours at a pH of 11 and 95°C. The molar ratio is 1:1.9; the mass ratio of PEG to p-cresol is 1:4; another part is added with urea and paraformaldehyde (the molar ratio is 1:1.9), and the mass ratio of PEG to urea is 1:10; then Add potassium hydroxide aqueous solution, adjust the pH value to 10.5, and 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, and react at 95°C for 7 hours;

[0030] (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°C for 8 hours, and the aldehyde content is 0.08 % m...

Embodiment 3

[0034] The preparation method of the present embodiment phenolic modified urea-formaldehyde fiber, the steps are as follows:

[0035] (1) Dissolve polyvinyl formal in water to obtain a 20wt% polyvinyl formal aqueous solution, which is divided into two parts, one part is added with p-cresol, glutaraldehyde and calcium hydroxide, and the pH is 8.5 and 65 °C Under reaction 4h, the mol ratio of p-cresol and glutaraldehyde is 1:1.3; The mass ratio of polyvinyl formal and p-cresol is 1:3; Another part adds urea and glutaraldehyde (mol ratio is 1: 1.1), wherein the mass ratio of polyvinyl formal and urea is 1:5; then add triethanolamine, adjust the pH value to 8.5, and react at 90°C for 3 hours; after blending the two parts of the solution, add phosphoric acid to adjust the pH value to 5, Reaction at 85°C for 2h;

[0036] (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....

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Abstract

The invention discloses a preparation method of phenol-modified urea-formaldehyde fiber, which is divided into two polymer aqueous solutions, respectively adding phenols, aldehydes and alkaline catalysts to react (solution A), urea, aldehydes and alkaline catalysts Reaction (B solution); A and B solutions are mixed and added with an acidic catalyst to continue the reaction, then a basic catalyst and the remaining aldehyde compounds are added to react, and after the end, the wet spinning machine is used for spinning, and the as-spun fiber wound through the coagulation bath is Heat and solidify in an oven, take out after natural cooling to obtain phenolic modified urea-formaldehyde fibers. The present invention prepares phenolic modified urea-formaldehyde fiber by wet spinning by rationally designing the reaction process. As a three-dimensional cross-linked fiber, the fiber has the advantages of low cost, flame-retardant fiber, heat insulation, no melt 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 in particular relates to a preparation method of phenol-modified urea-formaldehyde spinning solution, 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-linked resins cannot form ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/78C08G14/08
CPCC08G14/08D01F6/78
Inventor 杨凯焦明立张啸梅贾万顺李玉南张会迪曹健何建新
Owner ZHONGYUAN ENGINEERING COLLEGE
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