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Long-chain branched degradable polyester and preparation method thereof

A technology for degrading polyester and long-chain branching, which is applied in the production of bulk chemicals, plastic recycling, and recycling technology. The effect of degradation performance

Active Publication Date: 2021-09-07
ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the increase of the aliphatic content in the copolyester, the biodegradability increases, but the heat resistance (glass transition temperature, melting point) and processability of the copolyester decrease accordingly.

Method used

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  • Long-chain branched degradable polyester and preparation method thereof
  • Long-chain branched degradable polyester and preparation method thereof
  • Long-chain branched degradable polyester and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0049] A preparation method of the degradable polyester, comprising the following steps:

[0050](1) Esterification reaction: Put all the monomers, catalysts and stabilizers into the reaction container, and after removing the air, carry out the esterification reaction at 180-260°C and 0.2-0.4MPa; when the amount of esterification distillate reaches the theoretical When the value is 75-85%, the esterification reaction is ended;

[0051] The catalyst is stannous octoate, stannous isooctanoate, stannous oxalate, stannous chloride, stannous oxide, antimony ethylene glycol, antimony trioxide, antimony acetate, tetrabutyl titanate, n-tetrapropyl titanate , one or more of titanium oxalate, titanium acetate and titanium tetrachloride; the amount of catalyst used is 50-400 ppm of the molar weight of all organic acids and their derivatives;

[0052] The stabilizer is one or more of phosphoric acid, alkyl phosphate, triphenyl phosphate, alkyl diaryl phosphate and mixed alkyl aryl phosph...

Embodiment 1

[0056] A preparation method for long-chain branched degradable polyester, comprising the following steps:

[0057] (1) Esterification reaction: put 415.33g terephthalic acid, 365.35g adipic acid, 8.41g trimellitic acid, 545.05g butanediol, 0.17g tetrabutyl titanate and 0.82g triphenyl phosphate into the reaction In the kettle, use nitrogen to remove the air in the reaction kettle, and carry out the esterification reaction at 250°C and 3MPa; when the amount of the esterification distillate reaches about 80% of the theoretical value, the esterification reaction is terminated;

[0058] (2) Polycondensation reaction: Vacuumize the glycol to remove the diol, and make the vacuum degree reach within 60Pa after 60 minutes. At the same time, adjust the temperature to 280°C and carry out the polycondensation reaction until a certain intrinsic viscosity is reached to obtain a long-chain branched degradable polymer. ester.

Embodiment 2

[0060] A preparation method for long-chain branched degradable polyester, comprising the following steps:

[0061] (1) Esterification reaction: put 498.39g terephthalic acid, 292.28g adipic acid, 8.41g trimellitic acid, 545.05g butanediol, 0.17g tetrabutyl titanate and 0.82g triphenyl phosphate into the reaction In the kettle, use nitrogen to remove the air in the reaction kettle, and carry out the esterification reaction at 250°C and 3MPa; when the amount of the esterification distillate reaches about 80% of the theoretical value, the esterification reaction is terminated;

[0062] (2) Polycondensation reaction: Vacuumize the glycol to remove the diol, and make the vacuum degree reach within 60Pa after 60 minutes. At the same time, adjust the temperature to 290°C and carry out the polycondensation reaction until a certain intrinsic viscosity is reached to obtain a long-chain branched degradable polymer. ester.

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Abstract

The invention relates to the field of degradable polyester, and discloses long-chain branched degradable polyester and a preparation method thereof. The polyester is formed by polycondensing the following monomers: (a) aromatic dibasic acid and a derivative thereof; (b) straight-chain aliphatic dibasic acid with less than 10 carbon atoms and a derivative thereof; (c) straight-chain aliphatic dihydric alcohol with less than 6 carbon atoms; and (d) polybasic organic acid and a derivative thereof. According to the invention, with the introduction of the polybasic organic acids and the derivatives thereof, a long-chain branched chain molecular structure is constructed, such that the degradability of the polyester is improved while the melt strength and the heat resistance can be ensured.

Description

technical field [0001] The invention relates to the field of degradable polyesters, in particular to a long-chain branched degradable polyester and a preparation method thereof. Background technique [0002] Since the industrial production of polyester by DuPont in the United States in 1953, polyester has been widely used because of its excellent performance and low price. At present, common polyester waste disposal methods include landfill, incineration and recycling. The way of landfill is simple, but the complete degradation of polyester can even last up to 450 years; incineration is simple and fast, but it will cause serious pollution to the environment; the way of recycling, the types of polyester that can be physically recycled and reused are limited, and the chemical recycling process is complicated ,high cost. Therefore, it is urgent to start from the modification and recycling of polyester to solve the current environmental pollution problem of polyester. Biodegr...

Claims

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Application Information

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IPC IPC(8): C08G63/20C08G63/85C08G63/86C08G63/87
CPCC08G63/20C08G63/85C08G63/866C08G63/87Y02W30/62
Inventor 吴海强王松林欧阳杰王文俊
Owner ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD
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