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Method for preparing recycled polyester high-purity synthetic particle

A recycled polyester, high-purity technology, applied in the field of preparation of synthetic particles, can solve the problems of small molecules with high impurity content, increased cost, large viscosity difference, etc. Uniform extrudate effect

Inactive Publication Date: 2014-03-26
扬州天富龙集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, most general recycled chemical fiber enterprises in China use recycled foam materials to directly produce recycled chemical fibers of various specifications. Due to the complicated sources of recycled raw materials, the viscosity varies greatly, and the impurity content is different, and the small molecule contains a lot of impurities. In the actual spinning process, the product quality of recycled chemical fibers is seriously affected. Therefore, the short fibers made of polyester foam materials in the market currently have poor physical indicators and extremely unstable quality. They can only be used to produce low-grade civilian products with low requirements, such as It is used to make fillings for quilts, sofas, mattresses and other home textile products, as well as civil carpets, clothing imitation down and other products
However, some manufacturers of recycled slices often use single-screw extruders. The quality of the synthetic particles produced is not stable enough, and the purity is not uniform enough. At the same time, the waste materials are not effectively used in the entire production process, which not only wastes resources, but also increases costs. Not environmentally friendly
In addition, the purity of the recycled polyester foam used by most enterprises in the production of fibers is not high enough, and it is easy to produce broken threads and stiff threads in the pre-spinning process of the fibers, which will affect the quality indicators of the finished fibers such as the number of defects, handle, curl number, curl rate, etc.

Method used

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  • Method for preparing recycled polyester high-purity synthetic particle

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preparation example Construction

[0025] A method for preparing high-purity synthetic particles, comprising the following steps:

[0026] Step 1: Selection of raw and auxiliary materials, raw materials include waste silk in the production process of chemical fiber enterprises, leftovers of chemical fiber non-woven, textile and clothing fabric manufacturers, waste and old clothing and textiles, etc. Regenerated polyester foam of various colors;

[0027] Step 2: Dry the material, put the recycled polyester foam materials of various colors into the drum, heat them with steam, and then use a vacuum pump to remove the water and dry them;

[0028] Step 3: The recycled raw material after drying is extruded by a twin-screw extruder, and then enters a polymerization viscosifying reactor for viscosifying reaction to obtain a high-viscosity recycled melt, and then filters out small molecular impurity particles through a melt filter Enter the next process;

[0029] Step 4: Reaction The filtered regenerated polyester melt...

Embodiment 1

[0031] The raw material is recycled polyester polyester foam with an impurity content of less than 2 / 10,000 and an intrinsic viscosity of 0.55dl / g; the material is put into the drum and heated with steam at a temperature of 158°C, and then used The vacuum pump is vacuumed for 8 hours to remove the water, so that the water content of the raw materials is not higher than 0.02%. During the process, the temperature in each zone of the twin-screw extruder is 268~285°C; it is cooled under water to normal temperature and cut off to obtain the required high-purity synthetic particles. The particle quality index has been tested: particle size: 31.6 g / piece; particle size: 99.2%; water content: 0.14%; viscosity: 0.71 η.

Embodiment 2

[0033] The raw material is recycled polyester polyester foam with an impurity content of less than 2 / 10,000 and an intrinsic viscosity of 0.60dl / g; the material is put into the drum and heated with steam at a temperature of 158°C, and then used The vacuum pump is vacuumed for 8 hours to remove the water, so that the water content of the raw materials is not higher than 0.02%. During the process, the temperature in each zone of the twin-screw extruder is 268~285°C; it is cooled under water to normal temperature and cut off to obtain the required high-purity synthetic particles. The particle quality index has been tested: particle size: 29.8 g / piece; particle size: 98.8%; moisture content: 0.17%; viscosity: 0.76 η.

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Abstract

The invention relates to a method for preparing recycled polyester high-purity synthetic particle. The method comprises the following steps: firstly, selecting recycled polyester raw materials, drying the materials, melting and extruding the recycled polyester raw materials through a double-screw extruder, putting in a viscosity increasing reaction kettle to carry out viscosity increasing reaction, filtering out small-particle impurities in the high viscosity melt after the reaction through a melt filter and carrying out underwater cooling and pelletizing to obtain the recycled polyester high-purity synthetic particle. The method disclosed by the invention has the advantages that the phenomena such as filament break and filament ossification in fore-spinning process of fiber can be reduced and the fiber finished product quality is increased, so that the production cost is saved and the purposes of low carbon and environmental protection are realized; when being used for spinning recycled multifunctional polyester staple fiber products, the recycled polyester high-purity synthetic particle produced by adopting the method is capable of reducing the phenomena such as the filament break and the filament ossification and in the fore-spinning process of fiber and increasing the quality index of fiber finished products; in the meantime, the method disclosed by the invention is capable of effectively utilizing various recycled chemical fibers and textile wastes, so that the cost is reduced and the purposes of comprehensive utilization of resources and more environmental protection are realized.

Description

technical field [0001] The invention relates to a method for preparing synthetic particles, in particular to a method for preparing recycled polyester high-purity synthetic particles. Background technique [0002] At present, most general recycled chemical fiber enterprises in China use recycled foam materials to directly produce recycled chemical fibers of various specifications. Due to the complicated sources of recycled raw materials, the viscosity varies greatly, and the impurity content is different, and the small molecule contains a lot of impurities. In the actual spinning process, the product quality of recycled chemical fibers is seriously affected. Therefore, the short fibers made of polyester foam materials in the market currently have poor physical indicators and extremely unstable quality. They can only be used to produce low-grade civilian products with low requirements, such as It is used to make fillings for quilts, sofas, mattresses and other home textile pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/06C08G63/183B29C47/92B29C48/92
CPCB29C48/40B29C48/92B29C2948/92514B29C2948/92704B29C2948/92895
Inventor 朱大庆周国祥
Owner 扬州天富龙集团股份有限公司
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