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Method for preparing black polyurethane elastic fiber via in situ polymerization

A polyurethane elastic, in-situ polymerization technology, applied in the direction of chemical characteristics of fibers, single-component synthetic polymer rayon, rayon manufacturing, etc., can solve the negative effects of fiber mechanical properties, the improvement effect is not obvious, and the spinnability of the original solution is reduced. and other problems, to achieve the effect of excellent mechanical properties, good spinnability and lasting black effect

Active Publication Date: 2014-04-16
ZHEJIANG HUAFENG SPANDEX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the strong van der Waals force between nano-carbon black molecules, the added nano-carbon black is easy to agglomerate in the spinning stock solution, resulting in a decrease in the spinnability of the stock solution in the later stage. Fiber mechanical properties also cause certain negative effects
Even if some dispersants are used to improve the dispersibility of carbon black, the improvement effect is not obvious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Dry nano-carbon black at 110°C for 2 hours, take 120g and add it to 680g of N,N-dimethylacetamide (DMAC), and grind it for 5 hours; then put the ground carbon black solution in an ultrasonic oscillator Medium-ultrasonic dispersion for 2 hours to obtain a stable nano-carbon black dispersion with a concentration of 15%.

[0037] Add 420g of nano-carbon black dispersion 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'-diphenyl Methane diisocyanate, polymerized at 45°C for 2 hours. Add 14.68Kg of N,N-dimethylacetamide to prepare a prepolymer solution.

[0038] 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, a...

Embodiment 2

[0041] Dry nano-carbon black at 110°C for 2 hours, take 100g and add it to 400g N,N-dimethylacetamide (DMAC), grind it for 4 hours; then put the ground carbon black solution in an ultrasonic oscillator Ultrasonic dispersion was performed for 3 hours to obtain a stable nano-carbon black dispersion with a concentration of 20%.

[0042] Add 485g of nano-carbon black dispersion to 7.5Kg of polytetrahydrofuran ether glycol and 4.038Kg of N,N-dimethylacetamide solution, stir at high speed for 3 hours; then add 1.782Kg of 4,4'-diphenyl Methane diisocyanate, polymerized at 45°C for 2 hours. Add 15.144Kg of N,N-dimethylacetamide to prepare a prepolymer solution.

[0043]Cool the prepolymer solution to below 15°C, gradually add N,N-dimethylacetamide solution containing 0.324Kg of ethylenediamine, 0.021Kg of propylenediamine and 0.057Kg of diethylamine (the concentration of the amine is 4%) for chain extension reaction and chain termination reaction; then add antioxidant, anti-yellowin...

Embodiment 3

[0046] Dry nano-carbon black at 110°C for 2 hours, take 630g and add it to 1170g N,N-dimethylacetamide (DMAC), and grind it for 7 hours; then put the ground carbon black solution in an ultrasonic oscillator Ultrasonic dispersion was performed for 4 hours to obtain a stable dispersion of nano-carbon black with a concentration of 35%.

[0047] Add 1363g of nano-carbon black dispersion into 13Kg of polytetrahydrofuran ether glycol and 6.8Kg of N,N-dimethylacetamide solution, stir at high speed for 3 hours; then add 2.9Kg of 4,4-diphenylmethane di Isocyanate, polymerized at 45°C for 2 hours. A prepolymer solution was prepared by adding 22.73 Kg of N,N-dimethylacetamide.

[0048] Cool the prepolymer solution to below 15°C, and gradually add N,N-dimethylacetamide solution containing 0.336Kg of ethylenediamine, 0.046Kg of propylenediamine and 0.061Kg of diethylamine (the concentration of the amine is 5%) for chain extension reaction and chain termination reaction; then add antioxid...

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Abstract

The invention relates to a method for preparing a black polyurethane elastic fiber via in situ polymerization, comprising the following steps: (1) evenly dispersing nanometer carbon black particles in low-polymer polyhydric alcohol by using a grinding or ultrasonic and powerful mechanical stirring method so as to form a stable mixture, (2) adding diisocyanate in the polyhydric alcohol containing the carbon black particles for full reaction and adding a solvent for full dissolution to obtain NCO end capped prepolymer polyurethane formic ether solution; (3) carrying out chain extension and chain termination on the prepolymer solution by using mixed amine solution to generate polyurethane urea solution, and (4) curing the polyurethane urea solution and spinning the polyurethane urea solution into the black polyurethane elastic fiber by means of a dry spinning system. The polyurethane elastic fiber prepared via an in situ polymerization method is lasting in black effect and high in color fastness, so that the subsequent processing is free of dyeing; and at the same time, the polyurethane elastic fiber has relatively good mechanical property.

Description

technical field [0001] The invention belongs to the field of polymer material production, in particular to a method for preparing black polyurethane elastic fibers by in-situ polymerization. The black polyurethane elastic fiber produced by the invention has a longer-lasting black effect, high color fastness, does not need to be dyed again in subsequent processing, and has good mechanical properties at the same time. Background technique [0002] Polyurethane elastic fiber is called spandex in our country. It is a macromolecule composed of at least 85% (weight percent) polyurethane segments. It has the advantages of high breaking strength, high elongation at break and good elastic recovery rate, and the application range of polyurethane elastic fiber It is also gradually becoming wider. However, due to the molecular structure of the polyurethane elastic fiber itself, it is difficult to dye the polyurethane elastic fiber under normal dyeing conditions, and the poorly dyed pol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/94D01F1/10C08G18/76C08G18/66C08G18/48C08G18/32C08G18/10C08K3/04
Inventor 薛士壮刘亚辉温作杨席青费长书
Owner ZHEJIANG HUAFENG SPANDEX
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