Method for preparing copolymers lactic acid/rubber

A technology of rubber copolymerization and lactic acid, applied in the field of preparation of lactic acid copolymers, can solve problems such as affecting processability and application range, and achieve the effects of easy commercialization, simple and easy process control, and excellent post-processing performance.

Inactive Publication Date: 2006-04-19
DONGHUA UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, pure polylactic acid is a brittle material, which seriously affects its processability and application range.

Method used

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  • Method for preparing copolymers lactic acid/rubber
  • Method for preparing copolymers lactic acid/rubber
  • Method for preparing copolymers lactic acid/rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1 prepares polylactic acid / polybutadiene rubber (PLA / PB) copolymer

[0045] 1.1 Preparation of hydroxyl-terminated polylactic acid

[0046] In a 500ml three-necked flask, add 300g L-lactic acid (LLA) and 4.41g polyethylene glycol (PEG400), stir and heat to 100°C, and vacuum dehydrate under 100Pa pressure for 12h. Then add 1.5g of antimony trioxide as a catalyst, stir evenly, keep at 130°C, and continue to react for 4h. Finally, the temperature was raised to 160°C for 20 hours of reaction. The whole process is carried out under a reduced pressure environment, and the pressure in the bottle is: 100Pa in the early stage of the reaction, 75Pa in the middle stage of the reaction, and 20Pa in the late stage of the reaction.

[0047] After the reaction, the product was poured out and cooled at room temperature to obtain a colorless transparent solid. It was confirmed to be polylactic acid by infrared spectrum and nuclear magnetic resonance analysis. Its weight a...

Embodiment 2

[0054] Embodiment 2 prepares polylactic acid / acrylonitrile-butadiene rubber (PLA / BN) copolymer

[0055] 2.1 Preparation of hydroxyl-terminated polylactic acid

[0056] With the preparation method of 1.1 in embodiment 1.

[0057] 2.2 Preparation of isocyanate-terminated nitrile rubber

[0058] The method is to dissolve the hydroxyl-terminated nitrile rubber with a quantitative hydroxyl value of 0.45mmol / g and a number average molecular weight of 2700 in chloroform, add it to a 500ml three-necked flask, and then add quantitative HDI. After the system is stirred evenly, start to slowly heat up to 75-80°C, and react at this temperature for 3 hours to obtain isocyanate-terminated nitrile rubber.

[0059] 2.3 Preparation of PLA / BN copolymer

[0060] Dissolve the polylactic acid prepared in 2.1 in chloroform, and add it into the isocyanate-terminated nitrile rubber prepared in 2.2 in different proportions. The mass ratio of PLA / BN is between 20 / 80 and 80 / 20, while stirring. React...

Embodiment 3

[0061] Embodiment 3 prepares polylactic acid / polybutadiene rubber (PLA / BS) copolymer

[0062] 3.1 Preparation of hydroxyl-terminated polylactic acid

[0063] With the preparation method of 1.1 in embodiment 1.

[0064] 3.2 Preparation of isocyanate-terminated styrene-butadiene rubber

[0065] The method is to dissolve the hydroxyl-terminated styrene-butadiene rubber with a quantitative hydroxyl value of 0.6mmol / g and a number-average molecular weight of 2500 in chloroform, add it to a 500ml three-necked flask, and then add quantitative HDI. After the system is evenly stirred, start to slowly raise the temperature to 75-80°C, and react at this temperature for 3 hours to obtain the isocyanate-terminated styrene-butadiene rubber.

[0066] 3.3 Preparation of PLA / BS copolymer

[0067] Dissolve the polylactic acid prepared in 3.1 in chloroform, and add it to the isocyanate-terminated styrene-butadiene rubber prepared in 3.2 in different proportions. The mass ratio of PLA / BS is be...

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Abstract

A process for preparing lactic acid-rubber copolymer includes such steps as dewatering lactic acid, polycondensating, modifying its terminal radical to obtain hydroxy terminated polylactic acid, copolymerizing reaction on the isocyanate terminated rubber, and extending chain. Its advantage is easy control to the mechanical performance and biodegradation of product.

Description

technical field [0001] The present invention relates to the preparation method of polymer, especially relates to the preparation of lactic acid copolymer. Background technique [0002] Lactic acid polymer is also called polylactic acid (Poly(lactic acid); abbreviation: PLA), and its main production raw material is obtained by fermenting starch. Polylactic acid and its post-processing products have good biodegradability and renewability, and are in line with human environmental protection and sustainable development strategies, so they have very bright application prospects. However, pure PLA is a brittle material, which seriously affects its processability and application range. In order to expand its application field, many researchers have explored the modification of polylactic acid. At present, the main methods of modification are: [0003] (1) Copolymerization modification method [0004] Copolymerization modification aims to introduce another molecular segment into ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00
Inventor 余木火谢斯
Owner DONGHUA UNIV
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