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

A technology of modifying urea-formaldehyde and adding it in stages, which is applied in the fields of fiber chemical characteristics, single-component synthetic polymer rayon, textiles and papermaking, etc. It can solve the problems that there are no related reports on fiber application, and achieve simple and easy curing and crosslinking. Good flame retardant performance, high flame retardant safety effect

Active Publication Date: 2021-10-19
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 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 modified urea-formaldehyde fiber by adding in stages of the present embodiment, the steps are as follows:

[0024] (1) Dissolve PVA in water to obtain 1wt% PVA aqueous solution, add urea, aniline and formaldehyde (molar ratio is 1:0.2:0.4), the mass ratio of PVA to urea is 1:0.2, and then add sodium hydroxide aqueous solution to adjust When the pH value reaches 7.5, react at 45°C for 0.5h; then add hydrochloric acid to adjust the pH value to 4.0, add aniline and the second batch of formaldehyde (the molar ratio of urea to the two is 1:0.2:0.4), and react at 40°C for 0.1h;

[0025] (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;

[0026] (3) The resulting spinning solution is wet-spun, using saturated sodium sulfate aqueous solution with a weight content of 0.1% boric...

Embodiment 2

[0029] The method for preparing modified urea-formaldehyde fiber by adding in stages of the present embodiment, the steps are as follows:

[0030] (1) Dissolve PEG in water to obtain 30wt% PEG aqueous solution, add urea, phenol and paraformaldehyde (molar ratio is 1:0.2:1.5), the mass ratio of PEG to urea is 1:10, and then add potassium hydroxide aqueous solution , adjust the pH value to 10.5, and react at 95°C for 8h; then add sulfuric acid to adjust the pH value to 6.9, add phenol and the second batch of formaldehyde (the molar ratio of urea to the two is 1:0.2:2), and react at 95°C for 7h;

[0031] (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;

[0032] (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 ba...

Embodiment 3

[0035] The method for preparing modified urea-formaldehyde fiber by adding in stages of the present embodiment, the steps are as follows:

[0036] (1) Dissolve polyvinyl formal in water to obtain 20wt% polyvinyl formal aqueous solution, add urea, melamine and glutaraldehyde (molar ratio is 1:1.5:0.4), polyvinyl formal and urea mass The ratio is 1:3, then add triethanolamine, adjust the pH value to 8.5, and react at 90°C for 3 hours; then add phosphoric acid to adjust the pH value to 5, add the second batch of melamine and the second batch of formaldehyde (the molar ratio of urea to the two 1:1.2:0.4), react at 85°C for 2h;

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

[0038] (3) The resulting spinning solution was wet-spun, using saturated sodium sulfate aqueous solution with a weight ...

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Abstract

The invention discloses a method for preparing modified urea-formaldehyde fibers by adding in stages. After adding urea, aldehydes, modifiers and basic catalysts into the polymer aqueous solution for reaction, the modifiers, aldehydes and acidic catalysts are sequentially added , and finally add the basic catalyst and the remaining aldehyde compounds. After the reaction is finished, use a wet spinning machine to spin, and the as-spun fibers wound in the coagulation bath are heated and solidified in an oven, and then taken out after natural cooling to obtain urea-formaldehyde fibers. 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, fiber flame retardancy, 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 modified urea-formaldehyde fibers by adding aldehyde compounds, modifiers and the like in stages to prepare 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 relat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/78
CPCD01F6/78
Inventor 杨凯焦明立刁泉张啸梅曹健贾万顺李洁陈燕秦琦
Owner ZHONGYUAN ENGINEERING COLLEGE
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