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A kind of recovery method of pa6 copolymerization modified pet polyester waste

A technology of copolymerization modification and recovery method, which is applied in the field of polyester, and can solve problems such as poor applicability, loss of use value of alcoholysis products, and color difference of depolymerization products of polyamide esters.

Active Publication Date: 2021-05-04
SINOPEC YIZHENG CHEM FIBER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] PA6 modified PET copolyester is a newly developed modified PET variety. Due to the introduction of polyamide components in its molecular chain, the applicability of the above chemical recycling method for recycling is not good: for example, using the PET alcoholysis recycling method At high temperature, the polyamide ester component is prone to side reactions and produces colored impurities, which makes the depolymerization product of the polyamide ester very poor in hue and difficult to apply to subsequent processing applications; at the same time, these side reaction impurities and polyamide components If the alcoholysis products cannot be effectively separated, it will also have an impact on the reactivity, and in severe cases, these alcoholysis products will lose their utilization value
Since most of the polyamide ester is still PET, it is obviously difficult to apply the above-mentioned nylon regeneration method

Method used

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  • A kind of recovery method of pa6 copolymerization modified pet polyester waste

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 800g of ethylene glycol, 200g of PA6 modified PET copolyester waste particles, and 0.6g of catalyst zinc acetate were placed in a reaction kettle, the reaction temperature was 180°C, the stirring speed was 100rpm, and the reaction time was 3h. After the reaction is finished, filter, and the filtrate can continue to be reused by distilling EG from the filtrate. Dissolve the filter residue in 500ml of boiling water, add 4g of activated carbon for adsorption, and filter after fully stirring. After the filtrate is concentrated to 100ml, the crude BHET is crystallized in ice water. Dry at ℃.

[0025] Put 100g of crude BHET, 25g of terephthalic acid, 20g of adipic acid, and 0.16g of tetrabutyl titanate into the reactor for lactonization, and control the esterification temperature at 160°C. After the esterification, add 3.0g of pyromellitic anhydride , reduce the pressure to 90kPa within 60min, control the reaction temperature at 220°C and continue the reaction for 1h, take a ...

Embodiment 2

[0027] 800g of ethylene glycol, 200g of PA6 modified PET copolyester waste particles, and 0.4g of catalyst zinc acetate were placed in a reaction kettle, the reaction temperature was 200°C, the stirring speed was 100rpm, and the reaction time was 2h. After the reaction is finished, filter, and the filtrate can continue to be reused after distilling EG from the filtrate. Dissolve the filter residue in 500ml of boiling water, add 5g of activated carbon for adsorption, and filter after fully stirring. After the filtrate is concentrated to 100ml, the crude BHET is crystallized in ice water. Dry at ℃.

[0028] Put 100g of crude BHET, 100g of terephthalic acid, 100g of isophthalic acid, 55g of adipic acid, 180g of neopentyl glycol, and 0.08g of ethylene glycol antimony into the reactor, and control the esterification temperature at 250°C. , add 18g of pyromellitic anhydride, reduce the pressure to 80kPa within 60min, control the reaction temperature at 250°C and continue the reactio...

Embodiment 3

[0030] Put 1000g of ethylene glycol, 200g of PA6 modified PET copolyester waste particles, and 0.02g of catalyst manganese acetate into the reaction kettle, the reaction temperature is 250°C, the stirring speed is 100rpm, and the reaction time is 5h. After the reaction is finished, filter, and the filtrate can continue to be reused by distilling EG from the filtrate. Dissolve the filter residue in 500ml of boiling water, add 8g of activated carbon for adsorption, and filter after fully stirring. After the filtrate is concentrated to 100ml, the crude BHET is crystallized in ice water. Dry at ℃.

[0031] Put 100g of crude BHET, 63g of terephthalic acid, 50g of isophthalic acid, 38g of adipic acid, 67g of neopentyl glycol, and 0.02g of ethylene glycol antimony into the reactor, and control the esterification temperature at 180°C. After the esterification , add 7g of pyromellitic anhydride, reduce the pressure to 70kPa within 60min, control the reaction temperature at 240°C to con...

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Abstract

The invention provides a method for recycling PA6 copolymerized modified PET polyester waste, which uses activated carbon to adsorb and remove colored impurities, and hot water to fully dissolve water-soluble polyamide alcoholysis products and bishydroxyethyl terephthalate, Then use the difference in solubility between the two at low temperature to crystallize crude bishydroxyethyl terephthalate, so as to control the caprolactam content in the final copolyester alcoholysis product to be less than 0.1%, without further purification, it can be directly used to prepare unsaturated polyester Esters, coatings. The present invention effectively solves many unfavorable factors that exist when using the PET alcoholysis recovery method: polyamide component alcoholysis, side reaction products are complicated, and the separation process for obtaining high-purity bishydroxyethyl terephthalate is complicated; In the alcoholysis process, due to the side reaction of the polyamide component and the existence of the alcoholysis product, the alcoholysis product cannot be polymerized subsequently; through the simple treatment process of adsorption and recrystallization, the reuse of the alcoholysis product is realized, so that the whole process is reasonable and practical, and the waste material can be recycled purpose of the invention.

Description

technical field [0001] The invention relates to a polyester, in particular to a method for recycling polyester waste. Background technique [0002] In recent years, the research on the modification of polyester fiber has gradually developed from a single functional modification to the direction of comprehensive wearing comfort, and the development of polyester fiber for high moisture absorption, perspiration, and quick-drying fabrics has always been an important aspect to make it stand out from the differentiated fiber varieties. The pursuit goal of the industry is also an inevitable requirement for the development of polyester fiber. The staple fiber products made of PA6 copolymerized modified PET (polyamide ester) have good hand feeling, low pilling and easy dyeing performance, which can not only solve the problem of hand feel and fabric pilling caused by high strength polyester fiber, but also solve the problem of When the polyester fiber is blended with cotton, the fabr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/24C08G63/127C08G63/78C09D167/00C09D5/03C08L67/02C08L77/02
CPCC08G63/127C08G63/78C08J11/24C08J2367/02C08J2377/02C09D5/03C09D167/00Y02W30/62
Inventor 潘小虎李乃祥樊云婷庞道双
Owner SINOPEC YIZHENG CHEM FIBER