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Method for preparing low-temperature finalizing polyurethane elastic fiber

A polyurethane elastic, low-temperature setting technology, which is applied in the field of polyurethane elastic fiber material manufacturing, can solve the problems of fiber structure damage, fracture, restricting the application prospect of spandex, etc., and achieves the effect of saving energy consumption and expanding the scope of application

Active Publication Date: 2013-01-30
ZHEJIANG HUAFENG SPANDEX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, the spandex can achieve a better setting effect at a temperature of 170-195°C. However, under such high temperature conditions, animal wool will undergo tissue aging, fiber structure will be destroyed, and even break. Restricting the application prospect of spandex in the field of animal woolen fabrics

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0018] The preparation method of a low-temperature shaped polyurethane elastic fiber of the present invention includes the following steps:

[0019] Step ① Under 70℃ stirring conditions, the polyether glycol (PTMG), polyester glycol (PE), diphenylmethane diisocyanate (MDI), tetramethylxylylene diisocyanate (m- TMXDI) prepolymerize to prepare urethane prepolymer terminated with -NCO group;

[0020] Step ②Using N,N-dimethylacetamide (DMAC) or N,N-dimethylformamide (DMF) as a solvent, fully crush and dissolve the prepolymer;

[0021] Step ③ At 80° C., use a chain extender solution and a chain terminator solution to perform chain extension and chain termination reactions on the prepolymer to obtain a polyurethane urea solution;

[0022] Step ④ Add light stabilizer, antioxidant, lubricant and matting agent to the polyurethane urea solution to obtain a polyurethane spinning solution;

[0023] Step ⑤ With the aid of a dry spinning system, the polymer spinning solution is extruded, stretched a...

example 1

[0031] Step ① Under stirring conditions at 70°C, 1810g polyether diol, 200g polyester diol (molecular weight 2000), 402g diphenylmethane diisocyanate, 39.2g tetramethylxylylene diisocyanate (m- TMXDI) conduct polycondensation reaction to obtain prepolymer;

[0032] Step ② Simultaneously add 2764g of N,N-dimethylacetamide (DMAC) solvent to the prepolymer, and fully crush and dissolve the prepolymer;

[0033] Step ③ At 80℃, add 843g of chain extender DMAC solution (concentration of 5%wt) and 48.66g of chain terminator DMAC solution (concentration of 5%wt) to the prepolymer at the same time to obtain polymer polyurethane with appropriate molecular weight Urea solution; where the chain extender solution contains: ethylene diamine (34.17g), propylene diamine (4.96g), 1,4-butanediol (3.02g), DMAC (800.85g); the chain terminator solution contains: Diethylamine (2.43g), DMAC (46.23g).

[0034] Step ④ Add several light stabilizers, antioxidants, lubricants, and matting agents to the polyure...

example 2

[0037] Step ① Under stirring conditions at 70°C, 1810g polyether diol, 600g polyester diol (molecular weight 3000), 440g diphenylmethane diisocyanate, 85.89g tetramethylxylylene diisocyanate (m- TMXDI) conduct polycondensation reaction to obtain prepolymer;

[0038] Step ②Add 3310g of N,N-dimethylacetamide (DMAC) solvent to the prepolymer at the same time, and fully crush and dissolve the prepolymer;

[0039] Step ③At 80℃, add 1930g chain extender DMAC solution (concentration of 6%wt) and 80g chain terminator DMAC solution (concentration of 6%wt) to the prepolymer at the same time to obtain a polymer polyurethane urea with suitable molecular weight Solution; the chain extender solution contains: ethylene diamine (82g), propylene diamine (19.2g), 1,4-butanediol (9g), DMAC (1726.47g); the chain terminator solution contains: diethylamine (5.6g), DMAC (87.73g).

[0040] Step ④ Add several light stabilizers, antioxidants, lubricants, and matting agents to the polyurethane urea solution ...

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PUM

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Abstract

The invention relates to a method for preparing a low-temperature finalizing polyurethane elastic fiber, comprising the steps of carrying out condensation polymerization on polyether diol PTMG, polyester diol PE, diphenylmethane diisocyanate MDI and tetramethyl benzene dimethyl diisocyanate m-TMXDI to obtain a carbamic acid ester prepolymer, fully dissolving the prepolymer by taking DMAC (Dimethyl Acetamide) or DMF (Dimethyl Formamide) as the solvent, carrying out chain extension and chain termination on the prepolymer by using a chain extender and a chain terminator to obtain polyurethane urea solution, and finally adding various functional auxiliaries in the polyurethane urea solution and preparing to obtain the polyurethane elastic fiber with low-temperature finalizing performance via a dry spinning system.

Description

Technical field [0001] The invention is a method for preparing low-temperature shaped polyurethane elastic fiber, and belongs to the technical field of polyurethane elastic fiber material manufacturing. Background technique [0002] Polyurethane elastic fiber, commonly known as spandex, has the characteristics of high elasticity and high elongation similar to rubber. It can be blended with non-elastic fabric fibers to obtain embryo cloth. After high temperature setting and dyeing, it can obtain elastic cloth with various colors. It can greatly improve the wearing comfort of fabrics, so it is widely used in pantyhose, swimming suits, tight underwear, shirts, underpants and knitted outerwear. [0003] However, with the improvement of people's consumption concept, spandex has gradually been used in animal wool fabrics such as woolen sweaters to overcome the disadvantages of such fabrics that are prone to deformation and relaxation during repeated wearing and washing. Normally, spande...

Claims

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Application Information

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IPC IPC(8): D01F6/94C08G18/76C08G18/66C08G18/48C08G18/42C08G18/32C08G18/12
Inventor 温作杨毛植森刘刚席青费长书
Owner ZHEJIANG HUAFENG SPANDEX
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