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Method for preparing regenerative low-melting-point polyester with waste-polyester alcoholysis method

A low-melting point polyester and waste polyester technology, applied in the direction of single-component polyester rayon, rayon manufacturing, fiber chemical characteristics, etc., can solve the problem of large fluctuations in the content of by-product diethylene glycol and the hue of recycled polyester Variation, melting point is not easy to control and other problems, to achieve the effect of stabilizing the quality of alcoholysis products, reducing by-products, and realizing high-value recycling

Active Publication Date: 2018-02-02
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the above methods of obtaining ethylene terephthalate or oligomers through alcoholysis of ethylene glycol, and then performing polycondensation, due to the uncertainty of the source of raw materials, the hue of the recycled polyester will become poor, and the by-product diglycol The content of alcohol (DEG) fluctuates greatly, and the melting point is not easy to control, which reduces the quality of the product

Method used

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  • Method for preparing regenerative low-melting-point polyester with waste-polyester alcoholysis method
  • Method for preparing regenerative low-melting-point polyester with waste-polyester alcoholysis method

Examples

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Embodiment 1

[0017] A kind of waste polyester alcoholysis method of the present embodiment prepares the method for regenerated low-melting point polyester, such as figure 1 As shown, it includes the following steps: 1) pretreatment of waste polyester, directly smashing the clean waste polyester blocks into the feed bin, cutting the clean waste polyester fibers into the feed bin, and waste polyester bottle flakes Sorting, cleaning, impurity removal, crushing, cutting, and then feeding into the silo, and then mixing ingredients for the next process; 2) alcoholysis of waste polyester, the pretreated waste polyester, according to waste polyester (waste polyester) The molar percentage ratio of 1:2 is put into the alcoholysis kettle 1, and the alcoholysis kettle 1 contains ethylene terephthalate and oligomer (mother liquor) (adding in the first additive inlet 8), wherein the addition of ethylene terephthalate and oligomer (mother liquor) accounts for 40% of the total mass percentage of dropping ...

Embodiment 2

[0020]As described in Example 1, the difference is: the molar percentage of waste polyester and ethylene glycol is 1:4, and the alcoholysis still contains ethylene terephthalate and oligomers (mother liquor), wherein the The addition amount of ethylene glycol diformate and oligomer (mother liquor) accounted for 30% of the total mass percentage of input waste polyester, the reaction temperature was 200° C., and the reaction time was 4 hours. Add 0.2‰ (accounting for the mass percent of the product obtained) of phosphorous acid stabilizer; the esterification reaction temperature is 230 ° C, the reaction time is 1.5 hours, and simultaneously add 40% (accounting for the mass percent of the product obtained) of 1,4 cyclohexanedimethanol, 0.4 % (accounting for the mass percent of the obtained product) of DEG, so that the DEG content (accounting for the obtained product mass percent) of the esterified product is 2.4%. The temperature of polycondensation-I and polycondensation-II is c...

Embodiment 3

[0023] As described in Example 1, the difference is: the molar percentage of waste polyester and ethylene glycol is 1:6, and the alcoholysis still contains ethylene terephthalate and oligomers (mother liquor), wherein the The addition amount of ethylene glycol diformate and oligomer (mother liquor) accounted for 20% of the total mass percentage of input waste polyester, the reaction temperature was 190° C., and the reaction time was 2 hours. Add the trimethyl phosphate stabilizer of 0.2‰ (accounting for the mass percent of the product obtained); 220° C. of esterification reaction temperature, 1 hour of reaction time, add simultaneously the neopentyl glycol of 50% (accounting for the mass percent of the product obtained), 0.2% ( Accounting for DEG in the mass percent of the obtained product), the DEG content in the esterified product (accounting for the obtained product in mass percent) is 2.4%. The temperature of polycondensation-I and polycondensation-II is controlled to be 2...

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Abstract

The invention discloses a method for preparing regenerative low-melting-point polyester with a waste-polyester alcoholysis method. The method includes the steps of 1), pretreatment of waste polyester;2), alcoholysis of the waste polyester; 3), quality regulation of esters and adding of one or multiple copolymers of isophthalic acid, 1-4 cyclohexane dimethyl alcohol and neopentyl glycol; 4), polycondensation and slicing preparation, wherein the low-melting-point polyester finally obtained is 0.60-0.70dl / g in intrinsic viscosity, 100-180DEG C in melting point, 3.0+ / -0.3% in content of diglycoland smaller than 6 in chroma value of b. The obtained regenerative low-melting-point polyester is applicable to preparation of cationic-ion dyeable poester filaments and short fiber, and high-value recycling of the waste polyester is realized.

Description

technical field [0001] The invention relates to a method for preparing recycled low-melting point polyester by alcoholysis of waste polyester, belonging to the field of waste polyester recycling. Background technique [0002] Polyethylene terephthalate (PET, polyester for short), as an important raw material, is widely used in the production of beverage bottles, fibers, films, sheets, etc. With the rapid development of the polyester industry, the polyester waste produced during the production of polyester and the processing and use of its products is also increasing rapidly. Due to the strong chemical inertness of polyester, it is difficult to degrade or be decomposed by microorganisms in natural storage, which not only causes a huge waste of resources, but also produces serious environmental pollution. Therefore, realizing a virtuous cycle of resources and improving environmental quality through recycling has become an important issue in the current polyester industry. ...

Claims

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Application Information

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IPC IPC(8): C08G63/83C08G63/183C08J11/24D01F6/92D01F1/10
CPCC08G63/183C08G63/83C08J11/24D01F1/10D01F6/92Y02W30/62
Inventor 王秀华胡园超张须臻
Owner ZHEJIANG SCI-TECH UNIV
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