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Degradable polylactic acid diblock copolymer, preparation method and application to modified polylactic acid

A technology of block copolymer and polylactic acid, applied in the field of polymer materials, can solve the problems of high preparation cost, unsuitable for industrialized continuous production, unstable performance of modified polylactic acid, etc., and achieves simple preparation method and guaranteed biodegradability. properties, improving melt strength and melt processability

Active Publication Date: 2013-03-20
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems of unstable properties of modified polylactic acid, high preparation cost and unsuitability for industrial continuous production in the prior art, the present invention provides a degradable polylactic acid diblock copolymer, a preparation method and its application in modified polylactic acid application in

Method used

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  • Degradable polylactic acid diblock copolymer, preparation method and application to modified polylactic acid
  • Degradable polylactic acid diblock copolymer, preparation method and application to modified polylactic acid
  • Degradable polylactic acid diblock copolymer, preparation method and application to modified polylactic acid

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preparation example Construction

[0034] The preparation method of degradable polylactic acid diblock copolymer comprises the following steps:

[0035] (1) Under the protection of an inert atmosphere, add the polylactic acid A whose terminal group is a hydroxyl group after being fully dried and dehydrated into the reaction device;

[0036] (2) Add diisocyanate B into the reaction device, heat to 185°C-190°C, and stir for 5-8h;

[0037] (3) Adding degradable polymer C containing hydroxyl groups to the reaction device, at 185°C-190°C, and mechanically stirring for 1-2h;

[0038] (4) Add diisocyanate B into the reaction device, stir and react at 185°C-190°C until it is difficult to stir, and obtain a light yellow or light brown elastomer, which is a degradable polylactic acid diblock copolymer.

[0039] In the present invention, the molar ratio of polylactic acid A to the first added diisocyanate B is preferably 1:10-20, and the molar ratio of polylactic acid A to polymer C is preferably 0.01-3:1. The sum of th...

Embodiment 1

[0066] combine figure 1 Illustrative Example 1

[0067] Preparation of degradable polylactic acid diblock copolymer:

[0068] (1) Under the protection of nitrogen, fully dry 40g of polylactic acid A (molecular weight 15000g / mol) whose terminal group is a hydroxyl group, and put it into a three-necked flask;

[0069] (2) Add 9g of hexamethylene diisocyanate B (168g / mol) into the three-necked flask, heat up to 190°C, and stir for 5h;

[0070] (3) Add 300 g of castor oil (933 g / mol) into the three-necked flask, and mechanically stir at 190 ° C for 1 h;

[0071] (4) Add 45.5 g of hexamethylene diisocyanate B (168 g / mol) into the three-necked flask, and react at 190° C. until it cannot be stirred to obtain a degradable polylactic acid diblock copolymer.

[0072] figure 1 It is the gel permeation chromatogram of the degradable polylactic acid diblock copolymer of Example 1 of the present invention, from figure 1 It can be seen that the peak molecular weight is 86262g / mol, the n...

Embodiment 2

[0074] combine figure 2 Illustrative Example 2

[0075] (1) Under the protection of nitrogen, fully dry 40g of polylactic acid A (molecular weight 15000g / mol) whose terminal group is a hydroxyl group, and put it into a three-necked flask;

[0076] (2) Add 4.5 g of hexamethylene diisocyanate B (168 g / mol) into the three-necked flask, heat up to 190 ° C, and stir for 5 h;

[0077] (3) Add 240 g of castor oil (933 g / mol) into the three-necked flask, and mechanically stir at 190 ° C for 1 h;

[0078] (4) Add 39 g of hexamethylene diisocyanate B (168 g / mol) into the three-necked flask, and react at 190° C. until it cannot be stirred to obtain a degradable polylactic acid diblock copolymer.

[0079] figure 2 It is the gel permeation chromatogram of the degradable polylactic acid diblock copolymer of embodiment 2 of the present invention, from figure 2 It can be seen that the peak molecular weight is 127756g / mol, the number average molecular weight is 83503g / mol, the weight av...

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Abstract

The invention discloses a degradable polylactic acid diblock copolymer, a preparation method and application to modified polylactic acid, solving the problems of instable performance, high preparation cost and unsuitability for industrialized continuous production of modified polylactic resin in the prior art. The preparation method of the degradable polylactic acid diblock copolymer comprises the following steps of: adding dried and dewatered polylactic acid A with an end group being hydroxy into a reaction device under the protection of an inert atmosphere, adding diisocyanate B, heating to 185-190 DEG C, reacting with stirring for 5-8h, adding degradable high polymer C containing hydroxy, reacting with stirring for 1-2h at the temperature of 185-190 DEG C, adding the diisocyanate B, and reacting at the temperature of 185-190 DEG C until the stirring is difficult to obtain the degradable polylactic acid diblock copolymer. The degradable polylactic acid diblock copolymer disclosed by the invention is good in compatibility with the polylactic resin, is used for modifying the polylactic resin, is capable of remarkably improving processing property and mechanical property of the polylactic resin, and has the elongation at break reaching 60 percent.

Description

technical field [0001] The invention relates to a degradable polylactic acid diblock copolymer, a preparation method and its application in modified polylactic acid, belonging to the technical field of polymer materials. technical background [0002] Environmental pollution and energy crisis have long been major issues to be solved urgently by mankind. Natural polymer materials and biodegradable polymer materials have received more and more attention because of their good biodegradable properties. [0003] Polylactic acid is a polymer made of lactic acid as the main raw material. It can be synthesized through renewable plant resources-corn starch, tapioca starch, plant fiber, biological sugar, etc. The synthesis energy consumption is low, no pollution, and is conducive to ecology recycling; polylactic acid has good biodegradability, will not release toxic gases such as nitrogen and sulfide after incineration, and can be completely degraded by microorganisms in nature after ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/67C08G18/69C08G18/42C08L67/04C08L75/06C08L75/14
Inventor 黄绍永陈学思李杲项盛张宝庄秀丽
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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