Biodegradable polyester and preparation method thereof

A technology for degrading polyester and biology, applied in the field of preparation of biodegradable polyester, can solve the problems of gel, environmental impact, toxic substances, etc., and achieve the effect of low melt index, good mechanical properties, and favorable processing.

Active Publication Date: 2014-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polymers that use isocyanate chain extension may produce toxic substances during the degradation process, which will have a certain impact on the environment; moreover, gels and other phenomena will occur during the chain extension process, especially when the chain extender is used When the amount increases, the gel phenomenon is also more serious

Method used

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  • Biodegradable polyester and preparation method thereof

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preparation example Construction

[0011] The invention provides a method for preparing biodegradable polyester. The method comprises: mixing and contacting a branched aliphatic aromatic copolyester with an organotin catalyst, and then mixing and contacting the obtained mixture with lactate Ester contact reaction.

[0012] In the method, the purpose of mixing and contacting the branched aliphatic aromatic copolyester with the organotin catalyst is to complex the organotin catalyst with the branched aliphatic aromatic copolyester, Then catalyze the ring-opening polymerization of lactide. The process of mixing and contacting may include: maintaining the mixture of the branched aliphatic aromatic copolyester and the organotin catalyst at a vacuum degree below 200 Pa and a temperature of 30-80°C for 0.5-1 hours, and then kept at 140-170°C for 0.5-1 hour under an inert atmosphere. The inert atmosphere may be provided by a gas that does not react with the branched aliphatic aromatic copolyester and the organotin ca...

Embodiment 1

[0060] This example is used to illustrate the biodegradable polyester of the present invention and its preparation method.

[0061] (1) Preparation of branched aliphatic aromatic copolyesters

[0062]Catalyst: The catalyst contains 57.8% by weight of lanthanum stearate (prepared according to the method of Example A5 in CN1807485A, the same below), 23.2% by weight of tetrabutyl titanate (purchased from Beijing Chemical Reagent Company, the same below), 10.0% by weight of dibutyltin oxide (purchased from Beijing No. 3 Chemical Plant, the same below) and 9.0% by weight of triphenylhydroxytin (purchased from Beijing Chemical Reagent Company, the same below).

[0063] Add terephthalic acid, 1,4-butanediol and the above catalyst into a 2.5L reactor, stir and heat to reflux under a nitrogen atmosphere, adjust the temperature to 230°C and react at this temperature, the water to be reacted When it is completely evaporated (the reaction is about 100 minutes), add 1,4-butanedioic acid, ...

Embodiment 2

[0071] This example is used to illustrate the biodegradable polyester of the present invention and its preparation method.

[0072] According to the method of Example 1, the aliphatic aromatic copolyester with branching is prepared, and the specific preparation process of the biodegradable polyester is: 30g of the aliphatic aromatic copolyester is added to the reactor, and then Add 200mg of stannous octoate, followed by purging with high-purity nitrogen, mix evenly, keep at 50°C and absolute pressure of 200Pa for 1 hour, then purse with high-purity nitrogen for 0.5 hour, then place at 140°C under nitrogen atmosphere 0.5 hours. Afterwards, add 70g of L-lactide under the range of nitrogen, vacuumize, and purge three times with nitrogen, keep the nitrogen atmosphere, and raise the temperature to 170°C. After reacting for 5 hours, cool and open the reaction bottle, and chloroform the reaction bottle The mixture in the solution is dissolved, then added to anhydrous methanol for pr...

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Abstract

The invention relates to a biodegradable polyester preparation method and a biodegradable polyester prepared through the method. The method comprises the following steps: allowing aliphatic aromatic copolyester with a branched chain to be mixed and contact with and an organic tin catalyst, and carrying out a contact reaction on a mixture obtained after the mixing contact and lactide. The biodegradable polyester prepared through the method has good mechanical performances and a good biodegradation performance.

Description

technical field [0001] The invention relates to a preparation method of biodegradable polyester and biodegradable polyester prepared by the method. Background technique [0002] Polylactic acid is a well-known biodegradable material that can be widely used in fields such as medicine and hygiene, food packaging, agricultural and forestry mulch and plastic products. However, polylactic acid is hard and brittle and lacks toughness, which limits the application of polylactic acid. Therefore, the research on the toughening of polylactic acid has become a hot spot for researchers from all over the world. [0003] Introducing aliphatic aromatic copolyesters into polylactic acid materials to form copolyesters can improve the inherent brittleness and poor tear resistance of polylactic acid. At present, the method of introducing aliphatic aromatic copolyester or aliphatic copolyester into polylactic acid mainly adopts the method of chain extension coupling, and the chain extender is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/08C08G63/85
Inventor 许宁祝桂香张伟韩翎邹弋计文希
Owner CHINA PETROLEUM & CHEM CORP
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