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Aliphatic-polylactic acid segmented copolymer

A multi-block copolymer and aliphatic technology, which is applied in the field of aliphatic-polylactic acid multi-block copolymers, can solve the problems of poor mechanical properties, elongation at break can only reach 60%, and is not easy to degrade and change color , Reduce production cost, good color effect

Active Publication Date: 2015-02-18
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The degradable polylactic acid diblock copolymer has good compatibility with polylactic acid resin, but its mechanical properties are poor, and the elongation at break can only reach 60%.

Method used

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  • Aliphatic-polylactic acid segmented copolymer
  • Aliphatic-polylactic acid segmented copolymer
  • Aliphatic-polylactic acid segmented copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0166] 1.1 The reaction kettle is cooled by repeated vacuuming and filling with inert gas. In the case of nitrogen gas, add 5000g lactide, 124g propylene glycol and 2g stannous octoate, seal the system, and put it into an oil bath preheated to 130°C , stirred for 24 hours to stop the reaction, vacuumed to remove unreacted monomers, and the pressure was 700Pa to obtain double-terminated hydroxyl polylactic acid;

[0167] 1.2 After adding 580g of succinic acid, 500g of butanediol, 3g of glycerin, 1g of tetrabutyl titanate and 240g of double-terminated hydroxyl polylactic acid obtained in Example 1.1 into the reactor, the temperature of the reactor was raised to 150 ℃ and stir the reactants, and collect the water generated by the reaction at the same time. When the reaction no longer has liquid distilled out, set the reaction temperature to 255 ℃, gradually increase the temperature of the system, and vacuumize the polycondensation reaction when it reaches 255 ℃, gradually Reduce ...

Embodiment 2

[0173] Add 500g of succinic anhydride, 500g of butanediol, 1g of glycerol, 1g of tetrabutyl titanate and 120g of double-terminated hydroxyl polylactic acid obtained in Example 1.1 into the reactor in sequence, and raise the temperature of the reactor to 150°C And the reactant is stirred, and the water generated by the reaction is collected at the same time. When the reaction no longer has liquid distillation, the reaction temperature is set to 220 ° C, and the temperature of the system is gradually increased. Press to a high vacuum state, the pressure is 20Pa, polycondensation reaction is carried out, and the material is discharged for 15 hours to obtain polybutylene succinate-polylactic acid multi-block copolymer; the relative number average molecular weight is 20.0kg / mol.

[0174] The present invention tests the mechanical properties of the product according to the above-mentioned technical scheme, and the test results show that the elongation at break of the polybutylene suc...

Embodiment 3

[0176] After adding 850g dimethyl adipate, 500g butanediol, 1g glycerin, 1g tetrabutyl titanate and 240g of the double-terminated hydroxyl polylactic acid obtained in Example 1.1 to the reactor, the temperature of the reactor was increased to make it Stir the reactants at 150°C, and collect the water generated by the reaction at the same time. When the reaction no longer distills liquid, set the reaction temperature to 220°C, gradually increase the temperature of the system, and vacuumize the polycondensation reaction when it reaches 220°C , gradually decompressed to a high vacuum state, the pressure was 10Pa, polycondensation reaction was carried out, and the material was discharged for 15 hours to obtain polybutylene adipate-polylactic acid multi-block copolymer; the relative number average molecular weight was 27.0kg / mol.

[0177] The present invention tests the mechanical properties of the product according to the above-mentioned technical scheme, and the test results show ...

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Abstract

The invention provides an aliphatic-polylactic acid segmented copolymer. The preparation method of the copolymer comprises the following steps: polymerizing aliphatic dihydric alcohol compounds and lactide to obtain dihydroxy-terminal polylactic acid, and esterifying and polycondensing the aliphatic dicarboxylic acid compounds, aliphatic dihydric alcohol compounds, multi-element compounds and dihydroxy-terminal polylactic acid to obtain the aliphatic-polylactic acid segmented copolymer; or polymerizing polyol compounds and lactide to obtain polyhydroxy-terminal polylactic acid, and esterifying and polycondensing obtained polyhydroxy-terminal polylactic acid, the aliphatic dicarboxylic acid compounds and aliphatic dihydric alcohol compounds to obtain the aliphatic-polylactic acid segmented copolymer. The aliphatic-polylactic acid segmented copolymer contains branched aliphatic polyester chain segment, and a flexible chain segment is introduced, so that the flexibility of the aliphatic-polylactic acid segmented copolymer is improved, and the breaking elongation is improved; furthermore, the segmented copolymer has relatively high melt strength and is advantageous to molding processing of materials.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, in particular to an aliphatic-polylactic acid multi-block copolymer. Background technique [0002] With the intensification of environmental pollution, people put forward higher requirements for the use of polymer materials. While meeting the performance of materials, polymer materials are required to be non-polluting to the environment. Polylactic acid is a biodegradable green polymer material based on biomass resources. It is non-toxic, non-irritating, and has good biocompatibility and bioabsorbability. However, polylactic acid contains a large number of ester bonds and is hydrophilic. Poor resistance reduces the biocompatibility of polylactic acid and other substances. Polylactic acid itself is a linear polymer with low melt strength, high brittleness and poor impact resistance, which limits its wide use. [0003] Aiming at the above-mentioned shortcomings of polylactic acid, many r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/60C08G63/672
Inventor 张宝边新超陈学思李杲
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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