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A method for preparing urea-formaldehyde fiber by adding in portions

A technology of adding urea-formaldehyde in stages, applied to the chemical characteristics of fibers, single-component synthetic polymer rayon, textiles and papermaking, etc., can solve the problems of fiber applications that have not been reported, and achieve simple curing and crosslinking, Improved spinnability and mild reaction conditions

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

[0005] 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

[0024] The method for preparing urea-formaldehyde fiber by adding in stages of the present embodiment, the steps are as follows:

[0025] (1) Dissolve PVA in water to obtain 1wt% PVA aqueous solution, add urea and formaldehyde (molar ratio is 1:0.4), 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; then add hydrochloric acid to adjust the pH value to 4.0, add the second batch of formaldehyde (the molar ratio of urea to it is 1:0.4), and react at 40°C for 0.1h;

[0026] (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 1:0.2), and react at 35°C for 0.4h to obtain spinning solution;

[0027] (3) The resulting spinning solution is wet-spun, using saturated sodium sulfate aqueous solution with a weight content of 0.1% boric acid as a coagulation bath, and the winding speed is 10m / ...

Embodiment 2

[0030] The method for preparing urea-formaldehyde fiber by adding in stages of the present embodiment, the steps are as follows:

[0031] (1) Dissolve PEG in water to obtain 30wt% PEG aqueous solution, add urea and paraformaldehyde (molar ratio is 1:1.5), the mass ratio of PEG to urea is 1:10, then add potassium hydroxide aqueous solution to adjust the pH value To 10.5, react at 95°C for 8h; then add sulfuric acid to adjust the pH to 6.9, add the second batch of formaldehyde (the molar ratio of urea to it is 1:1.5), and react at 95°C for 7h;

[0032] (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), and react at 95°C for 8 hours to obtain a spinning solution;

[0033] (3) The resulting spinning solution is wet-spun, using saturated sodium sulfate aqueous solution with a weight content of 5% boric acid as a coagulation bath, and the winding speed is 500m / min at a temperatu...

Embodiment 3

[0036] The method for preparing urea-formaldehyde fiber by adding in stages of the present embodiment, the steps are as follows:

[0037] (1) Dissolve polyvinyl formal in water to obtain 20wt% polyvinyl formal aqueous solution, add urea and glutaraldehyde (molar ratio is 1:1.1), the mass ratio of polyvinyl formal to urea is 1: 3. Then add triethanolamine, adjust the pH value to 8.5, and react at 90°C for 3h; then add phosphoric acid to adjust the pH value to 5, add the second batch of formaldehyde (the molar ratio of urea to it is 1:0.9), and react at 85°C for 2h;

[0038] (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), and react at 75°C for 4 hours to obtain a spinning solution ;

[0039] (3) The resulting spinning solution was wet-spun, using saturated sodium sulfate aqueous solution with a weight content of 3% boric acid as a coagulation bath, and the wind...

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Abstract

The invention discloses a method for preparing urea-formaldehyde fibers by adding in stages. After adding urea, aldehydes and basic catalysts into the polymer aqueous solution for reaction, aldehydes and acidic catalysts are added in sequence, and finally basic catalysts and remaining aldehydes are added. After the reaction, the raw fiber is spun with a wet spinning machine, and the raw fiber wound by the coagulation bath is heated and solidified in an oven, and the urea-formaldehyde fiber is obtained after cooling down naturally. The invention improves the spinnability and stability of the spinning solution 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 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 obtaining functional urea-formaldehyde fibers by adding aldehyde compounds in stages, preparing urea-formaldehyde spinning solution, wet spinning and thermal curing. Background technique [0002] The three-dimensional cross-linked fiber has the characteristics of 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. The existing cross-linked fibers are only phenolic fibers and melamine fibers. [0003] Phenolic fiber is the first three-dimensional cross-linked organic fiber. In 1968, J. Economy first applied for a related patent [Economy J, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/76C08G12/12
CPCD01F6/76C08G12/12
Inventor 焦明立杨凯曹健曾灏宪张啸梅贾万顺刘英席艳君
Owner ZHONGYUAN ENGINEERING COLLEGE
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