Efficient production method of polyurethane elastic fiber

A polyurethane elasticity and production method technology, applied in the field of polyurethane elastic fiber material manufacturing, can solve problems such as high raw material prices, restricting industrial application prospects, and reducing production costs, so as to suppress the growth of subsequent aggregation viscosity and efficiently produce polyurethane elastic fibers , reduce the viscosity and the effect of viscosity growth rate

Active Publication Date: 2015-06-10
ZHEJIANG HUAFENG SPANDEX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the poly(tetramethylene-co-ethylene ether) glycol used in the above method, or 4,4-MDI, 2,4-MDI mixed diisocyanate spandex and other raw materials have not yet entered large-scale industrialization. stage, so the price of raw materials is relatively high, which is not conducive to the reduction of production costs, thus restricting the industrial application prospects of these technical methods

Method used

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  • Efficient production method of polyurethane elastic fiber
  • Efficient production method of polyurethane elastic fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step ① Send 407.95g of polytetramethylene ether glycol, 91.55g of 4,4-diphenylmethane diisocyanate, and 0.5g of n-butanol to the first reactor at the same time, and the reaction time is 2hr to obtain the prepolymer (PP) ;

[0028] Step ② Transport 500g of prepolymer and 596.5g of N,N-dimethylacetamide (DMAC) solvent to the high-speed dissolving machine at the same time, and fully dissolve PP under the action of high-speed shear force to obtain prepolymer solution (PPs);

[0029] Step ③ Transfer 1096.5g of prepolymer solution and 21.5g of ethylene glycol DMAC (concentration: 4%) solution to the second reactor at the same time, and make it undergo a chain extension reaction under the condition of rapid stirring to obtain the part containing -NCO-terminated polyurethane polymer solution;

[0030] Step 4. Transport the polyurethane polymer solution containing part-NCO end groups to the third reactor, and simultaneously feed 244.98g of mixed amines (including 0.83g of prop...

Embodiment 2

[0034] Step ① Send 407.95g of polytetramethylene ether glycol, 91.55g of 4,4-diphenylmethane diisocyanate, and 1.0g of n-butanol to the first reactor at the same time, and the reaction time is 2hr to obtain a prepolymer (PP) ;

[0035] Step ② Transport 500g of prepolymer and 565.4g of N,N-dimethylacetamide (DMAC) solvent to the high-speed dissolving machine at the same time, and fully dissolve PP under the action of high-speed shear force to obtain prepolymer solution (PPs);

[0036] Step ③ Transfer 1065.4g of prepolymer solution and 28.7g of ethylene glycol DMAC (concentration: 4%) solution to the second reactor at the same time, and make it undergo a chain extension reaction under the condition of rapid stirring to obtain the part containing -NCO-terminated polyurethane polymer solution;

[0037] Step 4. Transport the polyurethane polymer solution containing part-NCO end groups to the third reactor, and simultaneously feed 248.62g mixed amines (including 0.87g propylenedia...

Embodiment 3

[0041] Step ① Send 407.95g of polytetramethylene ether glycol, 91.55g of 4,4-diphenylmethane diisocyanate, and 1.5g of n-butanol to the first reactor at the same time, and the reaction time is 2hr to obtain the prepolymer (PP );

[0042] Step ② Transport 500g of prepolymer and 548.5g of N,N-dimethylacetamide (DMAC) solvent to the high-speed dissolving machine at the same time, and fully dissolve PP under the action of high-speed shear force to obtain prepolymer solution (PPs);

[0043] Step ③ Transfer 1048.5g of prepolymer solution and 30.8g of ethylene glycol DMAC (concentration: 4%) solution to the second reactor at the same time, and make it undergo a chain extension reaction under the condition of rapid stirring to obtain the part containing -NCO-terminated polyurethane polymer solution;

[0044] Step ④ transports the polyurethane polymer solution containing part-NCO end groups to the third reactor, and simultaneously feeds 254.73g mixed amines (comprising 0.95g propylen...

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Abstract

The invention relates to an efficient production method of polyurethane elastic fiber. According to the method, PTMG (polytetramethylene ether glycol) and 4,4-MDI (4,4-diphenylmethane diisocyanate) are taken as main raw materials, n-butyl alcohol is taken as an end-capping reagent for a prepolymerization reaction, and PP (prepolymer) is obtained; then, a distributed polymerization reaction manner is adopted, a glycol DMAC (dimethylacetamide) solution and a mixed amine DMAC solution are sequentially used for performing a primary chain extension reaction and a secondary chain extension reaction on PP, and a polyurethane and polyurea formic ether mixed polymer solution which is stable in performance and low in viscosity increase rate is obtained; then, functional auxiliaries of an antioxidant, a lubricating agent, a flatting agent, an ultraviolet absorbent and the like are added into the mixed polymer solution, and a spinning solution is obtained; and finally, the efficient production of polyurethane elastic fiber is realized by means of a spandex dry spinning system.

Description

technical field [0001] The invention is a high-efficiency polyurethane elastic fiber production method, which 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 fiber to obtain fabric fabric, which can greatly improve the wearing comfort of the fabric. Since the American DUPON company successfully commercialized spandex in 1958, the spandex industry has developed rapidly and has become one of the major chemical fiber industries. However, recently, with the further expansion of spandex production capacity and the impact of the European debt crisis, the entire spandex industry has been in a relatively sluggish state, product profits have declined, and competition among manufacturers has also intensified. Therefore, all spandex manufacturers are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/94C08G18/66C08G18/48C08G18/32C08G18/12
Inventor 温作杨梁红军陈铃席青费长书刘亚辉
Owner ZHEJIANG HUAFENG SPANDEX
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