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Preparation method of polyurethane raw liquid for high-speed spinning

A high-speed spinning, polyurethane technology, applied in the field of polyurethane elastic fibers, can solve the problem of the polyurethane urea stock solution not being able to spin efficiently, and achieve the effects of maintaining uniform stability, good viscosity stability, and improved elongation at break

Active Publication Date: 2014-04-09
ZHEJIANG HUAFENG SPANDEX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Technical problem: The purpose of the present invention is to overcome the problem that polyurethane urea stock solution cannot be spun efficiently under high concentration in the prior art, and provide a new prepolymer to make the spinning stock solution uniform and stable, so as to solve the problem of high-speed spinning of spandex difficult problem

Method used

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Examples

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Effect test

preparation example Construction

[0024] A kind of preparation method of the polyurethane stock solution that is used for high-speed spinning of the present invention, its preparation steps are as follows:

[0025] (1) Preparation of prepolymer: Add solvent and mixed polyether in sequence to the reactor, and then accurately add mixed diisocyanate according to a certain NCO / OH ratio. The prepolymerization reaction temperature is controlled at 40-50°C, the reaction time is 90min-150min, and nitrogen atmosphere is used during the reaction.

[0026] (2) Transfer the obtained prepolymer solution to the chain extension tank, and when the temperature of the prepolymer solution is cooled to 0-20°C, slowly add the chain extension amine solution to carry out the chain extension reaction to obtain the polyurethane urea solution.

[0027] (3) Add various auxiliary materials and auxiliary agents to the obtained polyurethane urea solution, and stir for 2-8 hours to obtain a uniform and stable polyurethane urea spinning stoc...

Embodiment 1

[0038] Add 5kgDMAc and 10kgPTMG (including 30%PTMG3000) into the pre-polymerization tank, stir and mix well, when the temperature reaches about 25°C, add 2.3kg of diisocyanate (containing 2% m-TMXDI), raise the temperature to 45°C, and react The time is 100min, and the prepolymerized product is obtained.

[0039] Transfer the pre-polymerization product to the chain extension tank, add 5kg DMAc to the pre-polymerization tank, add cleaning solvent, transfer to the chain extension tank, cool to 10°C, and slowly add 0.175kg EDA, 0.026kg PDA and 0.048kg di Ethylamine mixed chain extender amine solution for chain extension, with diethylamine for chain capping. After the reaction is completed, various additives such as anti-yellowing additives, anti-ultraviolet absorbers, antioxidants, lubricants, and matting agents are added, and the viscosity reaches 7000 poises to obtain a spinning polyurethaneurea solution with a final solid content of 45%. The spinning dope is dry-spun, extrude...

Embodiment 2

[0044] Add 6kgDMAc and 9kgPTMG (including 30%PTMG3000) into the prepolymerization tank, stir and mix well, when the temperature reaches about 25℃, add 2.5kg of diisocyanate (containing 5% m-TMXDI), raise the temperature to 50℃, and react The time is 150min, and the prepolymerized product is obtained.

[0045] Transfer the pre-polymerization product to the chain extension tank, add 5kg DMAc to the pre-polymerization tank, after cleaning, transfer to the chain extension tank, cool to 10°C, start to slowly add 0.175kg EDA, 0.026kg PDA and 0.048kg diethylene glycol A mixed chain extender solution of amines is used for chain extension, and diethylamine is used for chain termination. After the reaction is completed, various additives such as anti-yellowing additives, anti-ultraviolet absorbers, antioxidants, lubricants, and matting agents are added, and the viscosity reaches 6000 poises to obtain a spinning polyurethaneurea solution with a final solid content of 42%. The spinning s...

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Abstract

The invention relates to a preparation method of polyurethane raw liquid for high-speed spinning. The preparation method comprises the following steps: (1) adding a solvent and mixed polyester to a pre-polymerization tank; (2) accurately adding mixed diisocyanate according to a predetermined NCO / OH ratio so as to carry out prepolymefization reaction; (3) after ending prepolymefization reaction, transferring a prepolymer to a chain extension tank, adding a cleaning solvent, uniformly stirring, and cooling a refrigerant to about 0-20 DEG C; (4) slowly adding chain extension amine and a chain terminating agent solution, and reacting so as to form a polyurethane urea solution in the end; (5) transferring the obtained polyurethane urea solution to a storage tank, and adding multiple functional auxiliary materials and additives; and (6) fully and uniformly stirring, carrying out vacuum defoamation, and preparing polyurethane fibers by using polymerization raw liquid through dry spinning. The polyurethane raw liquid for high-speed spinning can be used for the spinning of fibers at the spinning speed of above 1000m / min. The new technology can be used for improving the spinning efficiency and reducing energy consumption and labor cost.

Description

technical field [0001] The invention relates to a method for preparing a polyurethane stock solution for high-speed spinning, and belongs to the field of polyurethane elastic fibers. Background technique [0002] Polyurethane elastic fiber, also known as spandex, is a highly elastic textile fiber. Its elongation at break is generally 500% to 700%, with high breaking strength and high elastic recovery rate. Therefore, spandex fiber is widely used in fabrics. There are already many patented technologies on spandex production. [0003] The production efficiency of dry spinning is related to spinning speed, denier, and number of coils. Among them, the most critical is the spinning speed. It is mainly affected by the concentration of the polymer solution and the type of solvent used, as well as the solvent evaporation rate. The evaporation rate is in turn related to the denier per filament and the number of filaments. For example: Spinning a spandex yarn with 40 denier and 3 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/94C08G18/12C08G18/66C08G18/76
Inventor 邵晓林毛植森梁红军许图远冯益虎费长书席青
Owner ZHEJIANG HUAFENG SPANDEX
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