Method for preparing high-homogeneity spandex through continuous polymerization

A spandex and uniform technology, which is applied in the field of continuous polymerization to prepare high-uniform spandex, can solve the problems of insufficient effect in industrial application and lack of holistic research in spandex production process, and achieve improved structural regularity and uniformity, dynamic unwinding The effect of reducing the CV value of the stress variation coefficient and the small stress fluctuation R value

Active Publication Date: 2021-01-29
ZHEJIANG HUAFENG SPANDEX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the above studies only analyze a single factor, and there is a lack of overall research on the spandex production process, so there are still insufficient effects in industrial application

Method used

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  • Method for preparing high-homogeneity spandex through continuous polymerization
  • Method for preparing high-homogeneity spandex through continuous polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0030] (1) According to the flow rate of polytetramethylene ether glycol 476.7g / min, diphenylmethane diisocyanate 110.9g / min and phosphoric acid 0.6g / min, continuously add the three into the tubular static mixer Mixing, reacting and cooling to obtain a prepolymer;

[0031] (2) According to the flow rate of prepolymer 587.7g / min and dimethylacetamide solvent 904.2g / min, continuously and uninterruptedly join in the dynamic mixer A and carry out uniform mixing, dispersion, obtain prepolymer solution; The flow rate of the polymer solution 1491.2g / min and the mixed amine solution 247.3g / min are continuously and uninterruptedly added to the dynamic mixer B to carry out the amine reaction. The chain extender in the mixed amine is ethylenediamine, and the permanent chain terminator is Cyclooctylamine, the molar ratio of amine end groups of ethylenediamine to cyclooctylamine is 22:1; the addition of excess amine is controlled to obtain a polyurethaneurea solution with an apparent visco...

Embodiment example 2

[0034] (1) According to the flow rate of polytetramethylene ether glycol 556.1g / min, diphenylmethane diisocyanate 129.4g / min and acetyl chloride 1.4g / min, the three are continuously added to the tubular static mixer Mixing, reacting and cooling in to obtain the prepolymer;

[0035] (2) According to the flow rate of prepolymer 685.6g / min and dimethylacetamide solvent 1054.9g / min, continuously and uninterruptedly join in the dynamic mixer A and carry out uniform mixing, dispersion, obtain prepolymer solution; The flow rate of the polymer solution 1740.5g / min and the mixed amine solution 288.6g / min are continuously and uninterruptedly added to the dynamic mixer B for amine reaction. The chain extender in the mixed amine is 1,3-propylenediamine, which is permanent The chain terminator is octadecylamine, and the molar ratio of amine end groups between 1,3-propanediamine and octadecylamine is 30:1; the addition of excess amine is controlled to obtain a polyurethaneurea solution with...

Embodiment example 3

[0038] (1) According to the flow rate of polytetramethylene ether glycol 476.7g / min, diphenylmethane diisocyanate 110.9g / min and phosphoric acid 0.6g / min, continuously add the three into the tubular static mixer Mixing, reacting and cooling to obtain a prepolymer;

[0039] (2) According to the flow rate of prepolymer 587.7g / min and dimethylacetamide solvent 904.2g / min, continuously and uninterruptedly join in the dynamic mixer A and carry out uniform mixing, dispersion, obtain prepolymer solution; The flow rate of the polymer solution 1491.2g / min and the mixed amine solution 247.3g / min are continuously and uninterruptedly added to the dynamic mixer B to carry out the amine reaction. The chain extender in the mixed amine is ethylenediamine, and the permanent chain terminator is Cyclooctylamine, the molar ratio of amine end groups of ethylenediamine to cyclooctylamine is 18:1; the addition of excess amine is controlled to obtain a polyurethaneurea solution with an apparent visco...

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Abstract

The invention relates to a method for preparing high-homogeneity spandex through continuous polymerization. The method comprises the following steps: prepolymerization: continuously adding polytetramethylene ether glycol, diphenylmethane diisocyanate and a polymerization inhibitor into a tubular static mixer for mixing, reacting and cooling to obtain a prepolymer of which the mass percent of NCO is 1.0-4.0%; polymerization: continuously adding the prepolymer and a dimethylacetamide solvent into a dynamic mixer A, and uniformly mixing and dispersing to obtain a prepolymer solution with the massconcentration of 30-70%; continuously adding the prepolymer solution and the mixed amine solution into a dynamic mixer B to carry out a chain extension reaction; and curing and spinning: adding a gelremover into a polyurethane urea solution, and fully stirring and mixing; spraying and stretching the polyurethane stock solution into filaments by virtue of a dry spinning system after curing, and thus obtaining the high-uniformity spandex along with drying and volatilization of the solvent.

Description

technical field [0001] The invention relates to a method for preparing high-uniformity spandex through continuous polymerization, and belongs to the technical field of polyurethane elastic fiber material manufacturing. Background technique [0002] Spandex is a special textile fiber, which has been widely used in the fields of various covered yarns, circular knitting machines and warp knitted fabrics. Among them, high-end circular knitting machines and warp knitted fabrics require high uniformity of spandex, and the uniformity of conventional spandex basically fails to meet the requirements for use. In order to improve the uniformity of spandex products, spandex manufacturers and researchers at home and abroad have done a lot of research work on the key preparation technologies in the spandex production process. The main methods are as follows: [0003] 1. It is currently the most commonly used technical means to prepare high-uniformity spandex by improving the uniformity o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/94D01F1/10C08G18/10C08G18/48C08G18/32C08G18/66C08G18/38
CPCD01F6/94D01F1/10C08G18/10C08G18/6685C08G18/4854C08G18/2865C08G18/3228
Inventor 杨晓印池晓智温作杨邵晓林陈斌项超力
Owner ZHEJIANG HUAFENG SPANDEX
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