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A method for preparing copolyesteramide by depolymerizing nylon-containing waste polyester

A copolyester amide and waste polyester technology, which is applied in the field of waste polyester and nylon recycling, can solve the problems that nylon cannot be effectively utilized, and achieve stable depolymerization product quality, cost reduction, and high elongation at break Effect

Active Publication Date: 2022-03-11
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the above-mentioned problem that nylon in waste polyester cannot be effectively utilized, the purpose of this application is to provide a method for preparing copolyesteramide by depolymerizing waste polyester containing nylon, which uses waste polyester to first depolymerize into terephthalamide Ethylene glycol formate, and then copolymerized with nylon to prepare copolyesteramide, is the functional utilization of waste polyester

Method used

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  • A method for preparing copolyesteramide by depolymerizing nylon-containing waste polyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Sorting and cutting the recovered polyester / nylon fabrics (carpets, curtains) and polyester / nylon composite yarns with a compounding ratio of 15%, and densifying them for 15 minutes at a temperature of 150-260°C and a pressure of 0.1-10MPa. Nylon waste polyester foam was prepared by thermal friction molding process. Then add it to the screw granulator, feed gas or foaming agent together for foaming and granulation. The heating temperature of each zone of the screw granulator is 250°C, 260°C, 270°C, 280°C, 275°C, 275°C, 270°C, the feeding percentage of the screw is 25%, the speed is 45rpm, the pressure is 7.5Mpa, and the gas is fed into The volume is 0.1 L / min, the filter specification is 100 mesh, and the relative density is 0.7, and the average cell diameter is 100 μm. Microporous nylon waste polyester material is prepared.

[0049] Polyester (PET) depolymerization reaction: The prepared nylon waste polyester material is put into the depolymerization reactor at a rati...

Embodiment 2

[0053] As described in Example 1, the difference is: the raw material is made of waste nylon and waste polyester with a ratio of 1:4 and then subjected to twin-screw foaming treatment, and the relative density of the microporous nylon waste polyester prepared is 0.68 , the average cell diameter is 110μm, the molar percentage of waste polyester and ethylene glycol is 1:5, the alcoholysis kettle contains mother liquor accounting for 20% by mass of the total amount of waste polyester input, the depolymerization temperature is 200 ° C, and the pressure is 0.2 The reaction time is 2 hours at MPa, then continue to heat up to 265°C, and react at 0.2MPa for 2 hours, the copolymerization reaction temperature is 225°C, the vacuum degree is 300Kpa, the reaction time is 2 hours, the polycondensation reaction temperature is 265°C, the vacuum degree is 30Kpa, and the time is 3.5 hours . The intrinsic viscosity of the finally obtained regenerated copolyesteramide is 0.77dl / g, and the melting...

Embodiment 3

[0055] As described in Example 1, the difference is: the raw material percentage is 20% polyester-nylon composite yarn, the prepared microporous nylon-containing waste polyester has a relative density of 0.69, an average cell diameter of 105 μm, waste polyester and The molar percentage of ethylene glycol is 1:6, the alcoholysis kettle contains mother liquor accounting for 15% by mass of the total amount of waste polyester input, the depolymerization temperature is 205°C, and the reaction time is 2 hours at a pressure of 0.2MPa, and then continue to heat up to 260 ℃, 0.2MPa for 2 hours, the copolymerization reaction temperature is 235 ℃, the vacuum degree is 300Kpa, the reaction time is 2 hours, the polycondensation reaction temperature is 275 ℃, the vacuum degree is 30Kpa, the time is 3.5 hours. The intrinsic viscosity of the finally obtained regenerated copolyesteramide is 0.73dl / g, and the melting point is 221°C (results are shown in Table 1)

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Abstract

The application relates to the field of waste polyester and nylon recycling, in particular to a method for preparing copolyesteramide by depolymerizing nylon-containing waste polyester. The method includes the following steps: 1) After pretreatment of the waste polyester material containing nylon, it is made into a foam material by a thermal friction molding process; 2) The foam material is melted and regranulated in a screw extruder. Add physical or chemical foaming agent at the same time during the process to prepare microporous pellets with controllable cell size; 3) firstly add waste polyester and ethylene glycol into the reaction kettle in proportion to carry out the process under the action of catalyst Depolymerize the polyester for 1-3 hours. After the depolymerization is completed, filter the depolymerization solution. The filtrate contains BHET and oligomers; 4) Put the filtered nylon into the depolymerization kettle, and add ethylene glycol to Filter nylon to continue depolymerization to obtain a depolymerization product containing low molecular weight polyamide; 5) The filtrate obtained in step 3) and the depolymerization product obtained in step 4) are sent to the polycondensation kettle for pre-condensation under the action of a polycondensation catalyst and a stabilizer And final polycondensation, and finally prepared a recycled copolyesteramide.

Description

technical field [0001] The application relates to the field of waste polyester and nylon recycling, in particular to a method for preparing copolyesteramide by depolymerizing nylon-containing waste polyester. Background technique [0002] Polyethylene terephthalate (PET) is polymerized from terephthalic acid or dimethyl terephthalate and ethylene glycol. Due to its good physical and chemical stability and processability, it is widely used in textiles, clothing, decoration, food packaging and other fields. However, due to the strong chemical inertness of PET under natural conditions, it is difficult to be biodegraded, and a large amount of waste polyester has caused great pressure on the environment. Therefore, recycling waste polyester products can achieve effective recycling of resources and reduce environmental pollution. Pollution has become an important issue in the polyester industry. Nylon is also known as nylon (Nylon) fiber, and its scientific name is polyamide (po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/44C08J11/24C08J9/04C08L67/02C08L77/00
CPCC08G69/44C08J11/24C08J9/04C08J9/0061C08J2367/02C08J2477/00Y02W30/62
Inventor 王秀华王勇李新安黄宜坤郭静雯李勇
Owner ZHEJIANG SCI-TECH UNIV
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