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Method for producing decolored polyester, decolored polyester, and decoloring agent

A manufacturing method and decolorizing agent technology, which can be used in dyeing, textile and papermaking, plastic recycling, etc., and can solve the problems of inability to obtain dye extraction effect, reduction, low solubility of monoethylene glycol, etc.

Active Publication Date: 2021-10-15
SYNTEK CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, according to the research of the present inventors, it was confirmed that in the method described in Patent Document 2, since the solubility of the dye to monoethylene glycol is low, if the fibrous polyester is not repeatedly mixed with a large amount of monoethylene glycol heated If it is in contact, sufficient dye extraction effect (removal effect) cannot be obtained
In addition, in the method described in Patent Document 2, it was also confirmed that when the dye extraction was performed, the fibrous polyester was dissolved in monoethylene glycol, and its reduced mass (decrease) reached 10% to 15%, so It is also a problem from the perspective of raw material yield (Yield)

Method used

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  • Method for producing decolored polyester, decolored polyester, and decoloring agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] First, two pieces of uncut PET fibers colored by black disperse dye and blue disperse dye amounted to 450 g (overall density: 0.12 g / cm 3 ; The amount of nitrogen atoms contained in the colored clothing: 850ppm) The clothing (hereinafter, also described as "colored clothing") is dropped into a 5L flask (Flask), and 2,970g of the decolorizing agent that has been heated to a temperature of 180°C is added. The heating decolorizing agent of diethylene glycol monoethyl ether (number of carbon atoms: 10) is not stirred for 10 minutes, and the first decolorizing operation is carried out. Then, the clothing material (the clothing material after the first decolorization operation) and the decolorizing agent containing the dye were subjected to solid-liquid separation using a wire mesh.

[0085] Then, put the decolorizing agent used for the first time into the 5-L flask again, and add 2,970 g of new heating decolorizing agent (diethylene glycol monohexyl ether) at a temperature o...

Embodiment 2

[0104] Crystalline dry BHET and regenerated PET were obtained in the same manner as in Example 1, except that diethylene glycol monohexyl ether was used instead of triethylene glycol monobutyl ether (number of carbon atoms: 10) as a decolorizing agent.

Embodiment 3

[0106] Crystalline dry BHET and regenerated PET were obtained in the same manner as in Example 1, except that diethylene glycol monohexyl ether was used instead of tripropylene glycol monomethyl ether (number of carbon atoms: 10) as a decolorizing agent.

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Abstract

The invention provides a method for producing a decolored polyester in which the colorant is removed from a colorant-colored polyester to efficiently obtain the decolored polyester; the decolored polyester; and a decoloring agent usable for producing the decolored polyester. [Solution] The method for producing a decolored polyester of the present invention is characterized by comprising: a step in which a polyester colored with a colorant and a decoloring agent comprising a glycol ether compound having a boiling point at atmospheric pressure of 160 DEG C or higher are prepared; and a step in which the decoloring agent is heated to a temperature not higher than the melting point of the polyester and is brought into contact at least once with the colored polyester to thereby remove the colorant and obtain the decolored polyester.

Description

technical field [0001] The invention relates to a method for producing decolorized polyester, decolorized polyester and a decolorizing agent. Background technique [0002] Polyester (Polyester) Polyester (eg, Polyethylene Terephthalate: PET) is widely used as fibers, films, resin molded products, and the like because of its excellent characteristics. However, how to effectively utilize wastes such as polyester waste (fiber waste, film waste, resin waste) and used plastic bottles (PET Bottle) generated in the manufacturing process of these products, no matter in terms of cost or Environmental aspects are serious issues. As a processing method for these wastes, there have been researches and proposals on material recycling (Material Recycling), thermal recycling (Thermal Recycling), chemical recycling (Chemical Recycling), and the like. [0003] In terms of material recycling, the waste of polyester molded products such as used plastic bottles is mainly collected by local go...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/00C08G63/78C08L67/00
CPCD06P5/158C08G63/183C08G63/88C08J11/06C08J11/24D06P5/137D06P1/928D06P1/6133Y02W30/62C08G63/90
Inventor 高尾正树界通藤田博稻田修司
Owner SYNTEK CO LTD