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Method for preparing polyester spinning melt by removing polyurethane contained in waste polyester textile through alcoholysis of ethylene glycol

A technology of polyester spinning and waste polyester, which is applied in the field of high-value recycling of waste polyester, can solve the problems of poor post-drawing performance of vacuum pipes, poor melt flow performance, and large melt viscosity degradation, etc., to achieve Effects of improved melt flow properties, improved lipophilic properties, and improved fiber spinnability

Inactive Publication Date: 2017-01-04
NINGBO DAFA CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For foams processed from recycled polyester containing spandex (polyurethane), large melt viscosity degradation, poor melt flow performance, poor fiber cohesion caused by poor fiber oiling, and poor post-drawing performance are caused by the presence of spandex in the use of foam materials And vacuum tube tube heat exchanger is easy to block and other problems

Method used

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  • Method for preparing polyester spinning melt by removing polyurethane contained in waste polyester textile through alcoholysis of ethylene glycol
  • Method for preparing polyester spinning melt by removing polyurethane contained in waste polyester textile through alcoholysis of ethylene glycol

Examples

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Effect test

Embodiment 1

[0030]Mix the waste polyester textile foam containing spandex (accounting for 10% to 15% of the mass ratio of the foam) in the conventional waste polyester textile foam according to the addition ratio of 50%, and then according to the foam material impurity content, color, After the viscosity difference is compounded, it is spin-dried for 9 hours under certain vacuum (≤-0.96MPa) and temperature (145°C±5°C) conditions, and finally 110PPm of water is put into the spinning silo. Adjust the speed of the ethylene glycol pump so that the mass fraction of ethylene glycol measured is 3% of the foam material, the feed rate of the screw is 1t / h, and the temperature from the first to the tenth area of ​​the screw is 278°C, 280°C, and 285°C. , 290°C, 295°C, 290°C, 290°C, 288°C, 288°C, 286°C, the filter temperature is 288°C, and the residence time of the melt in the screw, filter and pipeline is 15min. It takes 70 minutes to enter the liquid-phase tempering and viscosity-adjusting device. ...

Embodiment 2

[0034] Mix the waste polyester textile foam containing spandex (accounting for 10% to 15% of the mass ratio of the foam) in the conventional waste polyester textile foam according to the addition ratio of 30%, and then according to the impurity content, color, After the viscosity difference is compounded, it is spin-dried for 9 hours under certain vacuum (≤-0.96MPa) and temperature (145°C±5°C) conditions, and finally 100PPm of water is put into the spinning silo. Adjust the speed of the ethylene glycol pump so that the mass fraction of ethylene glycol measured is 4% of the foam material, the feed rate of the screw is 1t / h, and the temperatures in the first to tenth areas of the screw are 278°C, 280°C, and 285°C in sequence , 290°C, 295°C, 290°C, 290°C, 288°C, 288°C, 286°C, the filter temperature is 288°C, and the residence time of the melt in the screw, filter and pipeline is 16min. It takes 75 minutes to enter the liquid-phase tempering and viscosity-adjusting device. The vac...

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Abstract

The invention relates to a waste polyester high-value circulation reutilization technique, in particular to a method for preparing a polyester spinning melt by removing polyurethane contained in a waste polyester textile through alcoholysis of ethylene glycol. According to the method for preparing the polyester spinning melt by removing the polyurethane contained in the waste polyester textile through the alcoholysis of the ethylene glycol, a waste polyester textile raw material contains the polyurethane, a raw material, in which ethylene glycol with 1% to 8% of the raw material mass is added, is fed to a screw extruder to be blended, melt and extruded, and the melt viscosity of melt from the screw extruder is 0.40 to 0.50 d1 / g; and then the material enters a hardening, tempering and viscosity regulation device, and the melt viscosity of the melt body discharged from the hardening, tempering and viscosity regulation device is 0.635 to 0.685 d1 / g. Due to an alcoholysis manner, the influences on the viscosity, flowing property, fiber saturation property and drafting property of a polyester melt body, and series problems that vacuum pipes and tubular heat exchangers are easy to block due to the existence of spandex (polyurethane) are reduced.

Description

technical field [0001] The invention relates to a high-value recycling technology of waste polyester, in particular to a method for preparing polyester spinning melt by alcoholizing ethylene glycol to remove polyurethane contained in waste polyester textiles. Background technique [0002] At present, with the development of textile differentiation, the proportion of blended fabrics is increasing, and more and more blended textiles are very unfavorable for the recycling of waste textiles, especially waste polyester textiles. Among them, the waste polyester textiles represented by spandex are the most prominent. The main reason is that the presence of a small amount of polyurethane will aggravate the decrease of the viscosity of polyester melt. Spinnability is also poor. In addition, when polyester blends containing spandex (polyurethane) are spun, due to the large number of polar groups in the polyurethane elastomer molecule, the low affinity with non-polar mineral oil also ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/24B29C47/92C08L67/00B29C48/92
CPCB29C48/92B29C2948/92704C08J11/24C08J2367/00C08J2475/04Y02W30/62
Inventor 邢喜全王方河钱军马哲峰郭学伟
Owner NINGBO DAFA CHEM FIBER
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