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Preparation method of urethane elastic fiber spinning original solution by PPG dry method

A technology of spinning stock solution and spandex, which is applied in the field of preparation of spandex spinning stock solution by PPG dry spinning, which can solve the problems of high production cost of spandex yarn, achieve the effects of reducing solvent and energy consumption, low viscosity, and increasing concentration

Active Publication Date: 2009-11-11
杭州青云新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the polymers in this method are polyether diols. Currently, due to reasons such as supply and raw materials, the price of PTMEG has reached 30,000 yuan / ton, and there is still an upward trend, causing the production cost of spandex yarn to remain high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: A kind of method of utilizing PPG dry spinning spandex spinning stock solution of this example, its steps are:

[0022] a. Mix PPG with polytetramethylene ether glycol, the molecular weight of PPG is 2000, the molecular weight of polytetramethylene ether glycol is 1800, and the molar ratio of PPG and polytetramethylene ether glycol is 1 : 4, add acid additives in the mixture and evenly mix, form mixed diol, wherein acid additives are benzoic acid, the concentration of acid additives is 95%, and acid additives are PPG and polyether glycol gross weight 100ppm;

[0023] b. Add diphenylmethane-4,4'diisocyanate to the mixed diol to form a prepolymer, wherein the molar ratio of the mixed diol to diphenylmethane-4,4'diisocyanate is 1:1.8;

[0024] c. Mix the prepolymer with DMF or DMAc to form a prepolymer solution with a solution concentration of 42%, and cool to 8°C;

[0025] d. The cooled prepolymer solution is chain-extended through a diamine solution to fo...

Embodiment 2

[0027] Embodiment 2: a kind of method of utilizing PPG dry spinning spandex spinning stock solution of this example, its steps are:

[0028] a. Mix PPG with polytetramethylene ether glycol, the molecular weight of PPG is 3000, the molecular weight of polytetramethylene ether glycol is 1500, and the molar ratio of PPG and polytetramethylene ether glycol is 1 : 2, then add acid additives in the mixture and evenly mix to form mixed diols, wherein the acid additives are benzoic acid, and the concentration of the acid additives is 95%, and the acid additives are the total weight of PPG and polyether glycol 150ppm;

[0029] b. Add diphenylmethane-4,4'diisocyanate to the mixed diol to form a prepolymer, wherein the molar ratio of the mixed diol to diphenylmethane-4,4'diisocyanate is 1:1.8;

[0030] c. Mix the prepolymer with DMF or DMAc to form a prepolymer solution with a solution concentration of 40%, and cool to 8°C;

[0031] d. The cooled prepolymer solution is chain-extended t...

Embodiment 3

[0033] Embodiment 3: a kind of method of this example utilizes PPG dry spinning spandex spinning stock solution preparation method, and its steps are:

[0034] a. Mix PPG with polytetramethylene ether glycol, the molecular weight of PPG is 2000, the molecular weight of polytetramethylene ether glycol is 2000, and the molar ratio of PPG and polytetramethylene ether glycol is 1 : 4, add acid additives in the mixture and evenly mix, form mixed diol, wherein acid additives are benzoic acid, the concentration of acid additives is 95%, and acid additives are PPG and polyether glycol gross weight 100ppm;

[0035] b. Add diphenylmethane-4,4'diisocyanate to the mixed diol to form a prepolymer, wherein the molar ratio of the mixed diol to diphenylmethane-4,4'diisocyanate is 1:2;

[0036] c. Mix the prepolymer with DMF or DMAc to form a prepolymer solution with a solution concentration of 40%, and cool to 8°C;

[0037] d. The cooled prepolymer solution is chain-extended through a diamine...

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PUM

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Abstract

The invention relates to a technology for producing urethane elastic fiber, in particular to a preparation method of urethane elastic fiber spinning original solution by a PPG dry method. The method mainly solves the technical problems that the preparation method of urethane elastic fiber in the prior art uses a large amount of polyether diol of which the material cost is relatively high so that the production cost of urethane elastic fiber silk is relatively high. The method comprises the steps of mixing PPG with polytetramethylene ether glycol, adding an acid additive in the mixture, and mixing uniformly to form a mixed diol, adding diphenylmethane-4,4'-diisocyanate in the mixed diol to form a performed polymer, making the performed polymer into a performed polymer solution, carrying out chain extension for the cooled performed polymer solution by a diamine solution to form a chain extending solution, using DMF or DMAc as a solvent for the diamine solution, adding the chain extending solution to an end capping reagent monofunctional amine after reaching a target viscosity to terminate the reaction, and finally homogenizing and putting the solution aside for adequate time to form the urethane elastic fiber spinning original solution.

Description

technical field [0001] The invention relates to a spandex production process, in particular to a method for preparing spandex spinning stock solution by using PPG dry spinning. Background technique [0002] The traditional solution dry spinning spandex production process is represented by INVISTA of the United States, Hyosung of South Korea and Toyobo of Japan. The polymer of the spinning stock solution is polyether glycol PTMEG (polytetramethylene ether glycol) and MDI (diphenylmethane-4,4`diisocyanate) prepolymer reacted with a molar ratio of 1:1.5~2, and then reacted with a diamine chain extender to reach a certain molecular weight, and then used DMF or DMAc Adjust the concentration to obtain a polymer with the desired viscosity. Chinese patent discloses another high-temperature-resistant and high-elastic spandex fiber and its preparation method (publication number: CN 101113534A). The spandex fiber includes polyether glycol, diisocyanate, n-butanol, mixed amine, antioxi...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/66C08G18/48D01D1/02D01F6/70
Inventor 张斌陈娟
Owner 杭州青云新材料股份有限公司