Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Long-chain-chain polylactic acid-based copolymer and preparation method thereof

A technology of branched polylactic acid-based copolymers, which is applied in the field of long-chain branched polylactic acid-based copolymers and its preparation, can solve the problem of difficulty in obtaining high-molecular-weight polylactic acid copolymers, the inability to effectively improve the melt strength of products, and the difficulty Film applications and other issues, to achieve the effect of process simplification, good biodegradability, and high molecular weight

Active Publication Date: 2022-01-21
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the copolymer obtained by the chain extension reaction in the prior art has a linear structure, and the melt strength of the product cannot be effectively improved, so it is difficult to apply it in fields such as films.
And prior art also is difficult to obtain the polylactic acid copolymer of high molecular weight, thereby has limited its application

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Long-chain-chain polylactic acid-based copolymer and preparation method thereof
  • Long-chain-chain polylactic acid-based copolymer and preparation method thereof
  • Long-chain-chain polylactic acid-based copolymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0060] The invention provides a method for preparing long-chain branched polylactic acid-based copolymers, comprising:

[0061] Carrying out the first reaction of monohydroxy polylactic acid and phthalic dianhydride to obtain dicarboxylic polylactic acid;

[0062] Carrying out the second reaction with the mono-epoxy polymer and the bis-carboxy polylactic acid to obtain bis-hydroxy polylactic acid;

[0063] The polyester and the dihydroxy polylactic acid are subjected to a chain extension reaction under the action of a chain extender to obtain a long-chain branched polylactic acid-based copolymer whose main chain is polyester and side chains are polylactic acid.

[0064] In the present invention, the monohydroxy polylactic acid is preferably one or more of L-polylactic acid and D-polylactic acid.

[0065] In the present invention, the number average molecular weight of the monohydroxy polylactic acid is preferably 10,000 to 50,000, more preferably 20,000 to 40,000, most prefer...

Embodiment 1

[0087] 1.1 Add 1140g of terephthalic acid, 1340g of adipic acid, 3000g of butanediol and 5g of tetrabutyl titanate into the flask in sequence, then rapidly raise the temperature to 190°C, and when no more liquid distills out of the reaction, raise the temperature to 240°C, The polycondensation reaction was carried out under vacuum at a pressure of 500 Pa. After 6 hours, a poly(butylene adipate-co-butylene terephthalate) copolymer was obtained with a number average molecular weight of 15,000.

[0088] 1.2 Repeated vacuuming and nitrogen filling Cool a 3L round-bottomed flask with a branch pipe, fill it with nitrogen, add 6g of isopropanol, 1440g of L-lactide and 2g of stannous octoate, and react at 130°C. After 15 hours of reaction, heat up Vacuumize to 180°C to remove unreacted monomers, and the pressure is 100Pa to obtain monohydroxy polylactic acid with a number average molecular weight of 16,000.

[0089] 1.3 React 160g of monohydroxy polylactic acid in 1.2 with 1.09g of py...

Embodiment 2

[0096] 2.1 After adding 1140g of terephthalic acid, 1340g of adipic acid, 2000g of ethylene glycol and 5g of tetrabutyl titanate into the flask in sequence, the temperature was rapidly raised to 180°C, and when no liquid distilled out of the reaction, the temperature was raised to 240°C. The polycondensation reaction was carried out under vacuum at a pressure of 500 Pa. After 7 hours, a poly(ethylene adipate-co-ethylene terephthalate) copolymer was obtained with a number average molecular weight of 17,000.

[0097] 2.2 React 200g of monohydroxy polylactic acid prepared in 1.2 of Example 1 with 1.09g of pyromellitic dianhydride at 170°C, and stir the reactant. After reacting for 2 hours, add 1.3g of allyl glycidyl ether , continue to stir, after 2h, obtain bishydroxy polylactic acid; Then add poly(ethylene adipate-co-ethylene terephthalate) and 6g hexamethylene diisocyanate in 150g 2.1 and stir for 15min, The long-chain branched polylactic acid-based copolymer was obtained, and...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
melting pointaaaaaaaaaa
melting pointaaaaaaaaaa
melt flow indexaaaaaaaaaa
Login to View More

Abstract

The invention provides a preparation method of a long-chain branched polylactic acid-based copolymer. The preparation method comprises the following steps: reacting monohydroxy polylactic acid with phthalic dianhydride to obtain dicarboxyl polylactic acid; then reacting the dicarboxyl polylactic acid with a monoepoxy compound to obtain dihydroxy polylactic acid; and finally, carrying out chain extension on the long-chain-branched polylactic acid-based copolymer and polyester under the action of a chain extender to obtain the long-chain-branched polylactic acid-based copolymer of which the main chain is a flexible chain segment and the side chain is polylactic acid. According to the polylactic acid-based copolymer prepared by the method provided by the invention, the copolymer is good in flexibility and high in mechanical property; the polymer has a long branch chain, so that the melt strength of the copolymer can be effectively adjusted; the copolymer has high molecular weight and can directly replace various current plastic product raw materials; and the preparation cost is low, and the biodegradability is good. The invention also provides the long-chain branched polylactic acid-based copolymer.

Description

technical field [0001] The invention belongs to the field of polymer materials, in particular to a long-chain branched polylactic acid-based copolymer and a preparation method thereof. Background technique [0002] Plastic packaging is simple and convenient, but the plastic packaging used in large quantities at present is non-degradable plastic, which has caused serious problems such as resource shortage and environmental pollution. The biodegradable plastic industry is the most effective way to solve this problem. Polylactic acid has excellent biodegradability and can be completely degraded by microorganisms in the soil within one year after being discarded, producing CO 2 And water, no pollution to the environment. However, polylactic acid contains a large number of ester bonds, and its hydrophilicity is poor, which reduces the compatibility of polylactic acid with other substances. Moreover, polylactic acid itself has high brittleness, poor impact resistance, and low me...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C08G63/91
CPCC08G81/00C08G63/912C08G2230/00Y02W90/10
Inventor 张宝刘焱龙边新超陈学思
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com