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Recycling method for PA6 copolymerization modified PET polyester waste materials

A technology of copolymerization modification and recovery method, which is applied in the field of polyester, and can solve problems such as the influence of reaction activity, colored impurities, and color difference of depolymerization products of polyester amide ester, so as to achieve recycling, reuse of waste materials, and reasonable process practical effect

Active Publication Date: 2019-03-29
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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  • Recycling method for PA6 copolymerization modified PET polyester waste materials

Examples

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 recycling method for PA6 copolymerization modified PET polyester waste materials. Active carbon can be used to adsorb and remove colored impurities; hot water can be used to fully dissolve a water-soluble polyamide alcoholysis product and dihydroxyethyl terephthalate; and crude dihydroxyethyl terephthalate can be separated by crystallization according to the solubility difference between the water-soluble polyamide alcoholysis product and the dihydroxyethyl terephthalate under a low temperature, so that the caprolactam content in a final copolyester alcoholysis productcan be controlled to be less than 0.1%; and the alcoholysis product can be directly used for preparing unsaturated polyester or paint without being further purified. The method effectively solves many unfavorable factors existing when PET alcoholysis recycling methods are used, and the unfavorable factors are as follows: the alcoholysis or side reaction products of polyamide components are complicated, and the separating process of obtaining high purity dihydroxyethyl terephthalate is complex; and as the side reaction or alcoholysis products of the polyamide components exist in the alcoholysis products, follow-up polymerization cannot be achieved if not through a purifying process. The re-utilization of the alcoholysis products can be realized through simple processing processes such as adsorption and recrystallization, and therefore, the purposes of making the whole technology reasonable and practical and realizing the recycling of waste materials can be achieved.

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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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
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