Method for preparing polyester spinning melt by eliminating polyurethane in polyester textiles through alcoholysis

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, large melt viscosity degradation, and poor melt flow properties, etc., to achieve Effects of improved melt flow properties, improved fiber spinnability, and improved lipophilic properties

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 eliminating polyurethane in polyester textiles through alcoholysis
  • Method for preparing polyester spinning melt by eliminating polyurethane in polyester textiles through alcoholysis
  • Method for preparing polyester spinning melt by eliminating polyurethane in polyester textiles through alcoholysis

Examples

Experimental program
Comparison scheme
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...

Embodiment 3

[0038] 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 alcohol pump so that the mass fraction of diethylene 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 zone of the screw is 278°C, 280°C, 285°C, 290°C ℃, 295℃, 290℃, 290℃, 288℃, 288℃, 286℃, the filter temperature is 288℃, 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. The vacuum degree ...

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Abstract

The invention relates to a waste polyester high-value circulation reutilization technology, in particular to a method for preparing polyester spinning melt by eliminating polyurethane in polyester textiles through alcoholysis. The method for preparing polyester spinning melt by eliminating polyurethane in polyester textiles alcoholysis is characterized in that the polyurethane exists in the polyester textile raw materials; alcohol accounting for 1 to 8 percent of the mass of the raw materials is added into the raw materials; blending and melting extrusion are performed after the materials enter a screw extruding machine; the melting viscosity of the melt discharged from the screw extruding machine is 0.40 to 0.50dl/g; then, the materials enter a tempering and viscosity regulating device; the melting viscosity of the melt discharged from the tempering and viscosity regulating device is 0.635 dl/g to 0.685dl/g. By using the alcoholysis mode, the influence and series of problems on polyester melt viscosity, flowing performance, fiber saturation performance, traction performance and easy blockage of vacuum pipelines and shell-and-tube heat exchangers caused by the existence of spandex (polyurethane) can be 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 removing polyurethane contained in waste polyester textiles by alcoholysis. 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 leads to the oi...

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 邢喜全王方河马哲峰杜芳
Owner NINGBO DAFA CHEM FIBER
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