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A kind of spandex waste liquid recycling method

A waste liquid and spandex technology, applied in textiles and papermaking, single-component synthetic polymer rayon, fiber chemical characteristics, etc., can solve problems such as inability to maximize waste liquid reuse, and achieve significant economic and social benefits Obvious effect of reducing environmental pressure

Active Publication Date: 2021-06-22
JIANGYIN L V CHEM FIBER PROCESS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method only treats the waste liquid in the pre-polymerization process, and does not involve the waste liquid in other production stages, so it cannot realize the maximum reuse of waste liquid

Method used

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  • A kind of spandex waste liquid recycling method
  • A kind of spandex waste liquid recycling method
  • A kind of spandex waste liquid recycling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) The first waste liquid solid pulverized matter is put into the waste liquid primary reactor R1, and 90 degrees hot water is introduced into the jacket of the reactor to heat, and the solid is melted and stirred. According to the analysis result of the NCO value of the material, in the reaction Add metered 4,4'-diphenylmethane diisocyanate MDI and polytetrahydrofuran PTMG to the kettle, and continue to stir and react for 30-120 minutes. After the NCO value reaches the requirement of about 2.35, the gear pump is used to send the waste liquid to the secondary reaction. Device R2;

[0030] (2) Add the DMAC solution to the waste liquid secondary reactor R2 according to the metering, so that the solid content is 27%, and stir and mix the pre-polymer sent from the waste liquid primary reactor R1, and then add the prepared polymer after mixing fully. Mixed amine solution, the mixed solution of EDA, DEA, PDA three amines and DMAC, the proportion of amine is 7%, the polymeriz...

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Abstract

The invention provides a method for recycling spandex waste liquid. The invention recycles the waste liquid from cleaning the first reactor, the second reactor and the raw liquid filter, and returns it to the device after being processed and comprehensively processed by a certain method, and finally produces qualified spandex fiber through spinning. The invention has remarkable economic effects and obvious social benefits. Through the full recovery of all waste materials in the spandex production process, the amount of solid waste can be greatly reduced, the company's environmental protection pressure can be effectively reduced, and considerable costs can be saved for the company.

Description

technical field [0001] The invention relates to a method for recycling spandex waste liquid. Background technique [0002] In the spandex production process, in order to ensure the quality of the product, the reactor and filter should be cleaned regularly. The equipment that needs to be cleaned is the first reactor, the second reactor, and the raw liquid filter. [0003] The polymer waste liquid produced by these three cleanings has different physical properties. The waste liquid produced by the first reactor cleaning is a pre-polymer (abbreviated as the first waste liquid) with a dynamic viscosity of about 800 poise. The waste liquid produced by the cleaning of the second reactor is the polymer just produced by the polymerization reaction (referred to as the second waste liquid), and the dynamic viscosity is about 2500 poise. The waste liquid produced by cleaning the raw liquid filter is a polymer that can be de-spun after reaching a certain molecular weight (referred to a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/94C08G18/48C08G18/76
CPCC08G18/4854C08G18/7671D01F6/94
Inventor 顾奕李江平刘正伟黄建刚丁洁琼
Owner JIANGYIN L V CHEM FIBER PROCESS TECH
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