A kind of method for preparing regenerated cationic dyeable polyester by alcoholysis of waste polyester

A cationic dye and waste polyester technology, which is applied in the direction of single-component polyester rayon, plastic recycling, rayon manufacturing, etc., can solve the problem of large fluctuations in the content of diethylene glycol by-products, poor hue of recycled polyester, Melting point is not easy to control and other problems, to achieve the effect of high-value recycling, stable quality, and stable product quality indicators

Active Publication Date: 2019-10-11
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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  • A kind of method for preparing regenerated cationic dyeable polyester by alcoholysis of waste polyester
  • A kind of method for preparing regenerated cationic dyeable polyester by alcoholysis of waste polyester

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Embodiment 1

[0017] A kind of waste polyester alcoholysis method of the present embodiment prepares the method for regenerated cationic dye dyeable 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 droppi...

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 the phosphorous acid stabilizer of 0.2‰ (accounting for the mass percentage of the product obtained); 230° C. of esterification reaction temperature, 1.5 hours of reaction time, add 3% (accounting for the mass percentage of the product obtained) and 8% (accounting for the mass percentage of the product obtained) of SIPA and 8% simultaneously ) PEG, 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) in the esterified product is 5.0%. The tempe...

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 the esterification reaction temperature, 1 hour of reaction time, add 4% (accounting for the mass percent of the product obtained) and 6% (accounting for the product obtained by mass percent) of SIPA and 6% simultaneously mass percent) PEG, 0.2% (accounting for the mass percent of the obtained product) of DEG, so that the DEG content in the esterified product (accounting for the obtained product mass percent) is 5.2%. The temp...

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Abstract

The invention discloses a method for preparing recycled cationic dyeable polyester by alcoholysis of waste polyester, which comprises the following steps: 1) pretreatment of waste polyester; 2) alcoholysis of waste polyester; 3) quality of esterified product Regulation and addition of sodium isophthalic acid-5-sulfonate and polyethylene glycol as comonomers; 4) Polycondensation and preparation of slices; the intrinsic viscosity of the finally obtained regenerated cationic dyeable polyester is 0.55~0.65 dl / g, melting point 220~230℃, diethylene glycol content 5.5±0.3%, chroma b value less than 8. The regenerated cationic dye-dyeable polyester prepared by the invention can be used in the preparation of cationic dye-dyeable polyester filaments and short fibers, and realizes high-value recycling of waste polyester.

Description

technical field [0001] The invention relates to a method for preparing regenerated cationic dye-dyeable 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 cu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/688C08G63/83C08J11/24D01F6/92D01F1/10
CPCC08G63/6886C08G63/83C08J11/24D01F1/10D01F6/92Y02W30/62
Inventor 王秀华邓倩倩张须臻
Owner ZHEJIANG SCI-TECH UNIV
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