Ternary copoly ester capable of biological degradation and its preparation method

A ternary copolyester and biodegradable technology, which is applied in the field of biodegradable ternary copolyester and its preparation, can solve the problems of affecting popularization and use, low melting point and strength, and decreased biodegradability of materials

Active Publication Date: 2005-06-08
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with pure PBS products, although the range of use of these products has been expanded due to the acquisition of toughness, the biodegradability of the material has declined due to the intervention of benzene rings. In industries with high requirements, PBS-CO-PET and PBS-CO-PBT cannot meet the requirements
Therefore, people copolymerized PBS and polyethylene succinate (PES) into a random copolymer of polybutylene succinate and polyethylene succinate (PBS-co-PES). ) (Amin Cao a, b, Takashi Okamurac, Polymer Degradation and Stability 78, 2002, 671-679), although the biodegradability and elongation at break of this material are higher than those of pure PBS, PBS-CO-PET and PBS-CO -PBT has been greatly improved, but unfortunately, the melting point and strength of PBS-co-PES are not high, which seriously affects its popularization and use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] What is prepared in this example is a PBS-CO-PES-CO-PET copolymer.

[0031] Add 0.54 moles of 1,4-butanedioic acid, 0.14 moles of 1,4-butanediol, and 0.54 moles of ethylene glycol into the reaction kettle, heat up, melt, stir and mix evenly, and then under the protection of nitrogen, Then raise the temperature to 200°C, keep this temperature and react at a stirring speed of 3r / s for 4 hours, stop the reaction and discharge the material, and obtain low molecular weight polybutylene succinate with an intrinsic viscosity of 0.16dl / g and polyethylene succinate mixture. At this point the molar ratio of PBS / PES in the mixture is about 79 / 21.

[0032] Add 0.50 moles of terephthalic acid and 0.64 moles of ethylene glycol into the reaction kettle together, heat up, melt, stir and mix evenly, then raise the temperature to 200°C, and increase the pressure inside the kettle to 5Mpa by adding nitrogen at the same time, keeping This temperature and pressure, and continue to stir th...

Embodiment 2

[0036] What is prepared in this example is a PBS-CO-PES-CO-PET copolymer.

[0037] Add 2 moles of 1.4-butanedioic acid, 0.46 moles of 1,4-butanediol, 1.64 moles of ethylene glycol, 1.34 moles of terephthalic acid, and 1.74 moles of ethylene glycol into the reaction kettle, and stir to raise the temperature under the protection of nitrogen. To 200°C, react for 4 hours; continue to add 0.0038 moles of tetrabutyl titanate under the protection of nitrogen, and react for 4 hours at a stirring speed of 8r / s, a temperature of 240°C, and a vacuum below 60Pa to obtain the product.

[0038] After testing, the molar content of PET in the product is 40%, and the molar ratio of PES and PBS is 78 / 22. At an ambient temperature of 20°C, the intrinsic viscosity is 0.72dL / g. After the injection molding machine is pressed into tablets, the tensile strength is 20MPa, the elongation at break is 1200%, and the melting point is 94°C. The biodegradability of the material 10% weight loss in 11 weeks ...

Embodiment 3

[0040] What is prepared in this example is a PBS-CO-PES-CO-PET copolymer.

[0041] Add 1 mole of 1.4-butanedioic acid, 0.23 moles of 1,4-butanediol, 1.86 moles of ethylene glycol, and 1.03 moles of dimethyl terephthalate into the reactor, and after esterification at 200°C for 4 hours, add three The mixture of antimony oxide and tetrabutyl titanate has a total of 0.00195 moles (antimony trioxide: 0.0000596 moles, tetrabutyl titanate: 0.00134 moles), under the protection of nitrogen, the stirring speed is 8r / s, and the temperature is 237°C , Vacuum degree below 60Pa, react for 3h to get the product.

[0042] After testing, the molar content of PET in the product is 50%, and the molar ratio of PES and PBS is 78 / 22. At an ambient temperature of 20°C, the intrinsic viscosity is 0.64dL / g. After being pressed into tablets by an injection molding machine, the tensile strength is 25MPa, the elongation at break is 870%, and the melting point is 112°C. The biodegradability of the materi...

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Abstract

A biodegradable three-element copolymer with high mechanical and thermal performance is prepared from the raw material used for synthesizing butanediol polysuccinate, the raw material used for synthesizing ethanediol polysuccinate, hexanediol polysuccinate, etc, and the raw materialused for synthesizing ethanediol polyterephthalate, etc through atactic copolymerizing.

Description

1. Technical field [0001] The invention belongs to the technical field of biodegradable multi-component copolyester products and preparation methods, and in particular relates to a biodegradable ternary copolyester and a preparation method thereof. 2. Background technology [0002] Polybutylene succinate (PBS), is a completely biodegradable polymer, which can eventually generate carbon dioxide and water under the action of bacteria or enzymes. At present, it has been produced and sold in Japan and Germany. into the market. However, the cost of this material is relatively high, and its mechanical properties cannot meet the actual needs of many industries. Therefore, people began to carry out a lot of modification research on it. For example, in order to improve the brittleness of PBS, people introduced benzene rings into PBS, and synthesized a random copolymer (PBS-CO-PET) of polybutylene succinate and polyethylene terephthalate (Darwin P.R Kint, Abdelilah Alla, Polymer 44...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/91
Inventor 王玉忠邓利民辛灵敏汪秀丽杨科珂周茜丁颂东
Owner SICHUAN UNIV
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