Method for preparing regenerated high-shrinkage polyester by waste polyester alcoholysis method

A waste polyester, high shrinkage technology, applied in the direction of plastic recycling, recycling technology, etc., can solve the problems of large fluctuations in the content of diethylene glycol by-products, deterioration of the hue of recycled polyester, and difficult control of melting point, etc., to achieve stable alcohol Improve product quality, reduce by-products, and achieve high-value recycling

Active Publication Date: 2018-03-13
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 regenerated high-shrinkage polyester by waste polyester alcoholysis method
  • Method for preparing regenerated high-shrinkage polyester by waste polyester alcoholysis method

Examples

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Effect test

Embodiment 1

[0017] A kind of waste polyester alcoholysis method of the present embodiment prepares the method for regenerated high-shrinkage 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 int...

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 10% (accounting for the mass percent of the product obtained) of isophthalic acid (IPA), 0.3% (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 2.5%. The temperature of polycondensation-I and polycondensation-II is contr...

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 0.2‰ (accounting for the mass percent of the product obtained) of trimethyl phosphate stabilizer; the esterification reaction temperature is 220 ° C, the reaction time is 1 hour, and simultaneously add 15% (accounting for the mass percent of the product obtained) of isophthalic acid (IPA), 0.2% (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 cont...

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Abstract

The invention discloses a method for preparing regenerated high-shrinkage polyester by a waste polyester alcoholysis method. The method comprises the following steps: (1) pretreatment of waste polyester, (2) alcoholysis of the waste polyester, (3) quality regulation and control of ester and addition of isophthalic acid or 1,4-cyclohexanedimethanol comonomer, and (4) polycondensation and preparation of sections. The intrinsic viscosity of the finally obtained regenerated high-shrinkage polyester is 0.60-0.70 dl/g, the melting point is 210-230 DEG C, the content of diethylene glycol is 3.0+/- 0.3%, and a chroma b value is less than 6. The prepared regenerated high-shrinkage polyester can be used for preparation of high-shrinkage polyester filaments, short fibers and high-shrinkage polyesterfilms; and high-valued recycling of the waste polyester is realized.

Description

technical field [0001] The invention relates to a method for preparing regenerated high-shrinkage polyester by alcoholysis of waste polyester, which belongs to the field of recycling and utilization of waste polyester. 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/672C08G63/78C08J11/24C08L67/02
CPCC08G63/672C08G63/78C08J11/24C08J2367/02C08L67/02C08L2203/12C08L2203/16Y02W30/62
Inventor 王秀华胡园超张须臻
Owner ZHEJIANG SCI-TECH UNIV
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