Polylactic acid ternary block copolyester and preparation method thereof

A ternary block and polylactic acid technology, applied in the field of modified biodegradable polyester, can solve problems such as unsatisfactory synergistic effect, complex preparation process, and difficult industrial realization, so as to maintain biodegradability and wide Prospects for development and effects of cost reduction

Active Publication Date: 2015-05-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, organic solvents need to have a separate recovery and treatment device, and if industrialized, it will inevitably increase the cost
CN 103113539A discloses a polylactic acid copolymer, which is obtained by blending polylactic acid, polylactic acid block copolymer, polylactic acid copolymer and polyterephthalic acid-adipate-butylene glycol ester (PBTA), wherein The addition of polylactic acid block copolymers and polylactic acid copolymers increases the compatibility of PLA and PBTA, while PBTA provides the flexibility and toughness of the copolymers, wherein the polylactic acid copolymers are high molecular weight prepared with ch

Method used

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  • Polylactic acid ternary block copolyester and preparation method thereof
  • Polylactic acid ternary block copolyester and preparation method thereof
  • Polylactic acid ternary block copolyester and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Add LLA to the reactor, add 0.2 parts by weight of stannous octoate (relative to 100 parts by weight of LLA), purging with high-purity nitrogen for 5 hours, and place the reaction bottle at 175 After 5 hours of reaction, the reaction bottle was cooled and opened, and the mixture was dissolved in chloroform and precipitated in anhydrous methanol. Polylactic acid prepolymer (PLA) was obtained after vacuum drying. The number average molecular weight measured by GPC was 30,000 g / mol, and the molecular weight distribution was 1.8.

[0050] Add sebacic acid and ethylene glycol into the there-necked flask at a molar ratio of 1:1.3, then add 0.1 parts by weight (relative to 100 parts by weight of sebacic acid and ethylene glycol) of tetrabutyl titanate, and then Under a nitrogen atmosphere, the temperature was gradually raised to 180° C., and the reaction was carried out for 2 hours until no small molecular fractions were evaporated; then, the obtained reaction product was in...

Embodiment 2

[0054] The polylactic acid triblock copolyester is prepared according to the method of Example 1, the difference is that the addition of the prepolymer is 112 grams of PLA, 70 grams of PESe, 98 grams of PES, 1.46 grams of HDI is added, and the chain segment structure in the product The weight ratio of the units PLA, PESe and PES is 40 / 25 / 35.

Embodiment 3

[0056] The method for preparing polylactic acid triblock copolyester according to embodiment 1, difference is, the addition of prepolymer is PLA 81 grams, PESe 81 grams, PES 108 grams, add HDI 1.42 grams, the chain segment structure in the product The weight ratio of the units PLA, PESe and PES is 30 / 30 / 40.

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Abstract

The invention discloses a polylactic acid-polyethylene glycol sebacate-polyethylene glycol succinate ternary block copolyester, the structural general formula of which is shown as the specification. Specifically, m is the polymerization degree of the polyethylene glycol sebacate structural unit, n is the polymerization degree of the polyethylene glycol succinate structural unit, p is the polymerization degree of the polylactic acid structural unit; and m, n, p are same or different, and are all positive integers greater than 5. In accordance with the GB/T 1040.2-2006 standard, the measured tensile strength is 20-40MPa, and the elongation at break is 100-300%. Based on the 100wt% of the copolyester, the weight percentage of the polylactic acid structural unit is 20%-60%, the weight percentage of the polyethylene glycol sebacate structural unit is 10%-40%, and the weight percentage of the polyethylene glycol succinate structural unit is 20%-50%. The copolyester is biodegradable, and also has good rigidity and toughness. The invention also discloses a preparation method of the polylactic acid ternary block copolyester.

Description

technical field [0001] The invention relates to a polylactic acid ternary block copolyester and a preparation method thereof, belonging to the field of modified biodegradable polyester. Background technique [0002] Polylactic acid (PLA) is a very important variety of biodegradable aliphatic polyesters. It has the advantages of high strength, good biocompatibility, and degradability. It has attracted much attention in the fields of biomedicine and packaging materials. market expectation. But its disadvantages are poor toughness, low melt strength, lack of flexibility and elasticity, poor impact resistance, low tear strength, etc., which limit the application of polylactic acid to a certain extent. [0003] Aliphatic polyesters are an important part of biodegradable polyesters, and are widely used in many fields because of their good biocompatibility and biodegradability. However, the cost of aliphatic polyester is high and the mechanical properties of the material are defe...

Claims

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Application Information

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IPC IPC(8): C08G63/685C08G18/73C08G18/42C08G18/76C08G63/08C08G63/16C08G63/78
Inventor 韩翎祝桂香张伟邹弋许宁计文希
Owner CHINA PETROLEUM & CHEM CORP
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