Method for preparing ultraviolet aging resistant spandex through in situ polymerization

A technology of anti-ultraviolet light and in-situ polymerization, which is applied in the field of polyurethane elastic fiber material manufacturing, can solve the problems of low solubility of anti-ultraviolet absorbers, clogging of conveying pipelines and auxiliary filters, and loss of anti-ultraviolet components, so as to achieve long-lasting anti-ultraviolet resistance. Photoaging properties, the effect of increasing the content

Active Publication Date: 2016-04-13
ZHEJIANG HUAFENG SPANDEX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, we have found through experiments that there are the following three problems in this type of anti-ultraviolet absorber: (1) the anti-ultraviolet performance of these anti-ultraviolet absorbers is not very good. (2) Since the solubility of the anti-ultraviolet absorber in dimethylacetamide is not high (at 25°C, the solubility is generally below 10g), the traditional method cannot The amount of anti-ultraviolet absorber added to spandex should be greatly increased, otherwise, the undissolved anti-ultraviolet absorber will not be completely dissolved during the blending process of the auxiliary materials, and then the undissolved anti-ultraviolet absorber will be aggregated, blocking the delivery pipeline and the auxiliary material filter, thus Cause production failure; (3) Since these anti-ultraviolet itself have relatively low molecular weight, in the high-temperature drying process of spandex tow (in the high-temperature spinning tunnel), migration is prone to occur, that is, these anti-ultraviolet absorbers will be removed from the polyurethane together with the solvent. Precipitation inside the polymer, resulting in loss of anti-UV components

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] At 45°C, 100g of the anti-ultraviolet absorber pentaerythritol tetrakis(2-cyano-3,3-diphenylacrylate) was added to 2kg of N,N-dimethylacetamide (dimethylacetamide), Stir vigorously for 2 hours to fully dissolve it in the solvent to obtain a stable dispersion with a concentration of 5%.

[0032] Take 754g of the above-prepared dispersion and add it to a solution of 10kg polytetrahydrofuran ether glycol and 5.385Kg of N,N-dimethylacetamide, stir at high speed for 3 hours; then add 2.3kg of 4,4'-diphenylmethane Diisocyanate, polymerized at 45°C for 2 hours. Add 14.68 kg of N,N-dimethylacetamide to prepare a prepolymer solution.

[0033] Cool the prepolymer solution to below 15°C, gradually add the N,N-dimethylacetamide solution containing 0.216kg of ethylenediamine, 0.014kg of propylenediamine and 0.038kg of diethylamine (the concentration of the amine is 3%) to carry out chain extension reaction and chain termination reaction; then add antioxidant, matting agent, lubric...

Embodiment 2

[0035]At 55°C, 160g of anti-ultraviolet absorber 2,2-thiobis(4-tert-octylphenol) n-butylamine nickel ester was added to 2kg of N,N-dimethylacetamide (dimethylacetamide ), stirred vigorously for 2 hours to fully dissolve in the solvent to obtain a stable dispersion with a concentration of 8%.

[0036] Take 785.5g of the above-prepared dispersion liquid and add it to a solution of 10kg polytetrahydrofuran ether glycol and 5.385kg N,N-dimethylacetamide, stir at high speed for 3 hours; then add 2.3kg of 4,4'-diphenyl Methane diisocyanate, polymerized at 45°C for 2 hours. Add 14.68 kg of N,N-dimethylacetamide to prepare a prepolymer solution.

[0037] Cool the prepolymer solution to below 15°C, and gradually add N,N-dimethylacetamide solution containing 0.216kg of ethylenediamine, 0.014kg of propylenediamine and 0.038kg of diethylamine (the concentration of the amine is 3%) to carry out chain extension reaction and chain termination reaction; then add antioxidant, matting agent, ...

Embodiment 3

[0039] At 60°C, 180g of anti-ultraviolet absorber N-(ethoxycarbonylphenyl)-N'-methyl-N'-phenylformamidine was added to 2kg of N,N-dimethylacetamide (di Methylacetamide) was vigorously stirred for 2 hours to fully dissolve in the solvent to obtain a stable dispersion with a concentration of 9%.

[0040] Take 837.9g ​​of the above-prepared dispersion and add it to a solution of 10kg polytetrahydrofuran ether glycol and 5.385kg N,N-dimethylacetamide, stir at high speed for 3 hours; then add 2.3kg of 4,4'-diphenyl Methane diisocyanate, polymerized at 45°C for 2 hours. Add 14.68 kg of N,N-dimethylacetamide to prepare a prepolymer solution.

[0041] Cool the prepolymer solution to below 15°C, and gradually add N,N-dimethylacetamide solution containing 0.216kg of ethylenediamine, 0.014kg of propylenediamine and 0.038kg of diethylamine (the concentration of the amine is 3%) to carry out chain extension reaction and chain termination reaction; then add antioxidant, matting agent, lub...

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PUM

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Abstract

The invention relates to a method for preparing ultraviolet aging resistant spandex through in situ polymerization. The method comprises the following steps: (1) dissolving a special uvioresistant absorbent to a dimethylacetamide solvent, and forming a stable dispersion liquid through stirring; (2) adding the dispersion liquid to oligomer polyol, mixing the oligomer polyol evenly, adding diisocyanate to prepare -NCO-capped carbamate prepolymer, and fully dissolving the carbamate prepolymer with the dimethylacetamide solvent to obtain a prepolymer solution; (3) carrying out chain expansion and chain termination reaction on the prepolymer by using the mixed amine solution to obtain a polyurethane-urea solution; (4) adding functional additives, such as an antioxidant, a delustering agent and a lubricating reeling agent to the polyurethane-urea solution, and stirring, mixing and storing the polyurethane-urea solution to prepare a polyurethane spinning solution; and (5) drawing and drying the prepared spinning solution by using a dry spinning system to obtain the ultraviolet aging resistant spandex.

Description

technical field [0001] The invention relates to a method for preparing anti-ultraviolet aging spandex by in-situ polymerization, and belongs to the technical field of polyurethane elastic fiber material manufacturing. Background technique [0002] Polyurethane elastic fiber, commonly known as spandex, is an inlay copolymer containing repeated urethane groups (-NH-C(=O)-O-) chain forging on the main chain. It has excellent characteristics such as rubber-like high elasticity and high elongation, and it can be blended with non-elastic fibers to obtain fabrics, which can greatly improve the wearing comfort of fabrics, making spandex fiber applications from underwear to outerwear, from knitting to Weaving, from From sportswear to fashion wear, from women's clothing to men's clothing, from ordinary fabrics to functional fabrics, from clothing industry to other industries, the use has been comprehensively improved. [0003] Ordinary spandex fibers will be exposed to strong natural...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/94D01F1/10D01D5/04C08G18/10C08G18/32C08G18/48C08G18/66C08K5/315C08K5/29C08K5/372
CPCC08G18/10C08G18/4825C08G18/4854C08G18/6685C08K5/29C08K5/315C08K5/3725D01D5/04D01F1/106D01F6/94C08G18/3228
Inventor 温作杨杨晓印邵晓林李娟池晓智吴志豪
Owner ZHEJIANG HUAFENG SPANDEX
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