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Method for preparing urea formaldehyde fiber through copolymerization modification

A technology of copolymerization modification and fiber, which is applied in the direction 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. The effect of fast spinning speed and mild reaction conditions

Active Publication Date: 2019-10-29
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

[0021] In this embodiment, the method for preparing urea-formaldehyde fiber by copolymerization modification is as follows:

[0022] (1) Dissolve PVA in water to obtain 1wt% PVA aqueous solution, add urea, melamine and formaldehyde (the molar ratio is 1:0.01:0.7), then add sodium hydroxide aqueous solution, adjust the pH to 7.5, and react at 45℃ for 0.5 h; The mass ratio of PVA to urea is 1:0.2; then add hydrochloric acid to adjust the pH to 4.0, and react at 40°C for 0.1h;

[0023] (2) Add calcium hydroxide aqueous solution again, adjust the pH to 7.4, and then add paraformaldehyde (the ratio of urea to paraformaldehyde in step (1) is 1:0.3), react at 35°C for 0.4h, Obtain a modified urea-formaldehyde solution with an aldehyde content of 0.09%;

[0024] (3) The obtained spinning solution is wet-spinned using a saturated sodium sulfate aqueous solution with a weight content of 0.1% boric acid as a coagulation bath, and the winding speed is 10m / min at a temperature of 10°C to obtain ...

Embodiment 2

[0027] In this embodiment, the method for preparing urea-formaldehyde fiber by copolymerization modification is as follows:

[0028] (1) Dissolve PEG in water to obtain 30wt% PEG aqueous solution, add urea, aniline and paraformaldehyde (molar ratio 1:1:0.7), then add potassium hydroxide aqueous solution, adjust the pH value to 10.5, at 95℃ React for 8 hours; wherein the mass ratio of PEG to urea is 1:10; then add sulfuric acid to adjust the pH to 6.9, and react at 95°C for 7 hours;

[0029] (2) Add sodium hydroxide aqueous solution again, adjust the pH to 10.5, then add formaldehyde (the ratio of urea to formaldehyde in step (1) is 1:2), react at 95°C for 8 hours to obtain an aldehyde content of 0.08 % Modified urea-formaldehyde solution;

[0030] (3) The resulting spinning solution is wet-spinned, using a 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 temperature of 60°C to obtain nascen...

Embodiment 3

[0033] In this embodiment, the method for preparing urea-formaldehyde fiber by copolymerization modification is as follows:

[0034] (1) Dissolve polyvinyl formal in water to obtain 20wt% polyvinyl formal aqueous solution, add urea, phenol and glutaraldehyde (the molar ratio is 1:0.01:4), then add triethanolamine to adjust the pH value To 8.5, react at 90°C for 3 hours; wherein the mass ratio of polyvinyl formal to urea is 1:5; then add phosphoric acid to adjust the pH to 5, and react at 85°C for 2 hours;

[0035] (2) Add potassium hydroxide aqueous solution again, adjust the pH to 8.5, then add acetaldehyde (the ratio of urea to acetaldehyde in step (1) is 1:0.5), react at 75°C for 4 hours to obtain the aldehyde content 0.1% modified urea-formaldehyde solution;

[0036] (3) The obtained spinning solution is wet-spinned using a saturated sodium sulfate aqueous solution with a weight content of 3% boric acid as a coagulation bath, and the winding speed is 300m / min at a temperature of...

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Abstract

The invention discloses a method for preparing a urea formaldehyde fiber through copolymerization modification. The method comprises the steps that a modifier, urea and aldehydes are added into a polymer aqueous solution, and then a base catalyst is added for reaction for different times; then an acid catalyst is added for continuous reaction, a base catalyst and remaining aldehyde compounds are added for reaction, after the reaction is completed, a wet spinning machine is used for spinning, a nascent fiber wounded through coagulation bath is heated and cured in a drying oven, after natural cooling, the nascent fiber is taken out, and thus the urea formaldehyde subjected to copolymerization modification is obtained. According to the method, by reasonably designing the reaction process, themodified urea formaldehyde fiber is prepared through wet spinning, the modified urea formaldehyde fiber serves as a three-dimensional cross-linked fiber, thus has the advantages of being low in cost,flame retardant in fiber, capable of realizing thermal insulation, free of melting drops, free of toxicity during combustion, and the like, and has broad application prospects.

Description

Technical field [0001] The invention belongs to the field of preparation of special fibers, and specifically relates to a method for preparing functional modified urea-formaldehyde fibers by copolymerizing a modified urea-formaldehyde spinning solution, wet spinning and thermal curing. 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 RA. US patent, 3650102], the advent of the fiber broke the inherent concept that three-dimensional crosslinked resins cannot be fiberized. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G12/38C08G12/12C08G12/08C08G14/08D01F6/78
CPCC08G12/38C08G12/12C08G12/08C08G14/08D01F6/78
Inventor 焦明立杨凯张啸梅贾万顺李涛朱根兴刁泉曹凤仪王志新
Owner ZHONGYUAN ENGINEERING COLLEGE
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