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Process for polyurethane crosslinking agent for melting spandex fiber

A technology of polyurethane crosslinking agent and production method, which is applied in the direction of single-component polyurethane artificial filament, textile and papermaking, fiber chemical characteristics, etc., can solve the problems of heat resistance and poor elastic recovery rate of melt-spun spandex fiber, and achieve Excellent spinning stability, improved heat resistance, and good spinning stability

Inactive Publication Date: 2007-11-14
SHANGHAI YITAN NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the difference in structure between melt-spun spandex fiber and dry-spun spandex fiber, compared with dry-spun spandex fiber, melt-spun spandex fiber has poorer performance in terms of heat resistance and elastic recovery rate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The polyester diol or polyether diol or the mixture of polyester diol and polyether diol is vacuum dehydrated at 100-140° C. for 1-3 hours, and the vacuum degree is -0.085-0.098 MPa. Described polyester diol is polyethylene adipate diol, polyethylene adipate propylene glycol ester diol, polyethylene adipate diethylene glycol ester diol, polyadipate 1 -4 butylene glycol ester diol, polyhexamethylene adipate 1,4 butanediol ester diol, polyethylene adipate glycol diethylene glycol ester diol, polyadipate 1,6 Two to four of hexanediol ester diol, polyεcaprolactone diol, and polycarbonate 1,6 hexanediol ester diol, the ratio of each component is determined according to the product performance requirements of melt-spun spandex fiber . Described polyether diol is the mixture of polytetrahydrofuran ether (PTMG) or polyoxypropylene glycol (PPG) or polytetrahydrofuran ether (PTMG) and polyoxypropylene glycol (PPG), polytetrahydrofuran ether (PTMG) in the mixture The molar ratio...

Embodiment 2

[0016] Weigh 1000 grams of polyester diol, the selection of the polyester diol is the same as in Example 1, and vacuum dehydrate it at 100-120°C for 1-2 hours in a 2 liter reactor, the vacuum degree is -0.085-0.098MPa, and the dehydration Finally, the polyester diol is cooled to 50-60°C, 480 grams of MDI (4,4'-diphenylmethane diisocyanate) is added to the reactor, and the reaction is carried out at 70-80°C for 1-3 hours under nitrogen gas to form Polyurethane crosslinker.

Embodiment 3

[0018] Weigh 1000 grams of polytetrahydrofuran ether (PTMG) in a 2-liter reactor and vacuum dehydrate it at 100-120 ° C for 1 to 2 hours. The vacuum degree is -0.085 ~ -0.098MPa. 50-60°C, add 380 grams of MDI (4,4'-diphenylmethane diisocyanate) into the reactor, and react with nitrogen at 70-80°C for 1-3 hours to generate a polyurethane crosslinking agent.

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Abstract

A production method of melt-spun polyurethane fiber by polyurethane crosslinker, polyesterdiol or polyetherdiol or mixture of polyesterdiol and polyetherdiol is vacuum dewatered under 100-140 degree C for 1-3 hours, and cooled to 50-60deg.C, added with diisocyanate under the protection of nitrogen. They react under 70-80deg.C for 1-5 hours to form the polyurethane crosslinker. The molar ratio between the referred polyesterdiol or polyetherdiol or polyesterdiol and polyetherdiol's mixture and diisocyanate is 1:1.5-1:3. The advantages of this method are simple process, high productivity, short production cycle, low production costs, less equipment investment and applied to industrial production. The crosslinker formed by using this method can improve the spinning stability, breaking strength and heat resistance of melt-spun polyurethane fiber, through practical test, the breaking strength of the melt-spun polyurethane fiber can reach to 1.5-1.8CN / dtex, and the flexible response rates of the fiber are 94-96% of 300% response, and 98% of 100% response, and the heat resistance of the fiber can be general increased by 10-15degree C, with its maximum of 140degree C, moreover, the fiber has excellent stability.

Description

technical field [0001] The invention relates to a production method of a crosslinking agent for melt spinning spandex. Background technique [0002] Melt-spun spandex has the advantages of simple process, high production efficiency, less equipment investment, no solvent, no emissions and residues, and environmental protection and safety. It is known as "green spandex" internationally. Due to the difference in structure between melt-spun spandex fiber and dry-spun spandex fiber, compared with dry-spun spandex fiber, melt-spun spandex fiber has poorer performance in terms of heat resistance and elastic recovery rate. Contents of the invention [0003] The purpose of the present invention is to solve the above-mentioned problems existing in the prior art, provide a kind of process flow simple, high production efficiency, short production cycle, low production cost, less equipment investment, can improve the spinning stability of melt-spun spandex fiber, The production method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/42C08G18/48D01F6/70D01F1/10
Inventor 张勇
Owner SHANGHAI YITAN NEW MATERIAL CO LTD
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