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

Polylactic acid and preparation thereof

A technology of polylactic acid and sulfonic acid compounds, applied in the field of polylactic acid containing rare earth compounds and its preparation, to achieve the effects of low catalytic activity, improved thermal stability, and superior thermal stability

Active Publication Date: 2012-01-18
萘琪沃克有限责任公司
View PDF7 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcomings of existing catalysts in the field of polycondensation of lactic acid, such as avoiding various problems caused by the presence of tin metal in polylactic acid, and further expanding the application of rare earth compounds, providing a non-toxic or low Toxic single-component rare earth compounds or rare earth compounds and volatile sulfonic acid composite catalysts that do not contain tin metal and can improve thermal stability polylactic acid

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add 110 g of 90% pure L-lactic acid and 0.2 g of lanthanum oxide into a 250 ml three-necked flask equipped with a stirrer and a condenser, vacuumize and replace nitrogen 3-5 times. Put the system in an oil bath at 120°C, stir and dehydrate it under the condition of 40KPa for 1 hour, then gradually reduce the pressure to 1KPa within 0.5 hours, while the temperature rises to 180°C, and continue to stir for 7 hours. Polylactic acid with a molecular weight of 30,000 and a molecular weight distribution of 1.57 has a thermal degradation rate of 0.11 wt% / min in a nitrogen atmosphere at 180°C.

Embodiment 2

[0036] Add 110 g of L-lactic acid with a purity of 90% and 0.21 g of neodymium oxide into a 250 ml three-necked flask equipped with a stirrer and a condenser, vacuumize and replace nitrogen 3-5 times. Put the system in an oil bath at 120°C, stir and dehydrate it under the condition of 40KPa for 1 hour, then gradually reduce the pressure to 1KPa within 0.5 hours, while the temperature rises to 180°C, and continue to stir for 7 hours. Polylactic acid with a molecular weight of 20,000 and a molecular weight distribution of 1.59 has a thermal degradation rate of 0.12 wt% / min in a nitrogen atmosphere at 180°C.

Embodiment 3

[0038] Add 110g of D-lactic acid with a purity of 90% and 0.23g of samarium oxide into a 250ml three-necked flask equipped with a stirrer and a condenser, vacuumize and replace nitrogen 3-5 times. Put the system in an oil bath at 100°C, stir and dehydrate it under the condition of 40KPa for 1h, then gradually reduce the pressure to 1KPa within 0.5 hours, while the temperature rises to 180°C, and continue to stir for 7 hours, the obtained weight average Polylactic acid with a molecular weight of 31,000 and a molecular weight distribution of 1.67 has a thermal degradation rate of 0.12 wt% / min in a nitrogen atmosphere at 180°C.

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
molecular weight distributionaaaaaaaaaa
molecular weight distributionaaaaaaaaaa
Login to View More

Abstract

The invention discloses a poly lactic acid containing a rare earth compound(C1) or a rare earth compound(C1) and a sulfonic acid compound(C2). The weight mean molecular weight of the poly lactic acid is between 5,000 and 50,000, and at a temperature of 180 DEG C and in a nitriding atmosphere, the thermal degradation speed is less than 0.87 weight percent / min. The invention also discloses a method for preparing the poly lactic acid, wherein the method comprises the following steps that: an L-lactic acid, a D-lactic acid and a mixture of the L-lactic acid and the D-lactic acid or a low polymer of the L-lactic acid and the D-lactic acid are taken as materials, and the materials are added with the rare earth compound(C1) or added with the rare earth compound(C1) and the sulfonic acid compound(C2) at the same time for the melt polycondensation reaction, and the poly lactic acid is obtained. The poly lactic acid obtained by the method has the thermal stability far better than that of the sample prepared by the tin catalyst under the same condition and the thermal degradation speed lowered by one order of magnitude compared with the sample prepared by the tin catalyst under the same condition.

Description

technical field [0001] The invention relates to the field of organic polymers, in particular to a polylactic acid containing rare earth compounds and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) has good biocompatibility and biodegradability, and its degradation products can participate in the metabolism of the human body, and its performance can be adjusted in a wide range by copolymerization with other monomers. One of the biodegradable materials. [0003] PLA can be prepared by ring-opening (indirect) methods and direct condensation methods. The ring-opening method is to first dehydrate lactic acid to obtain its dimer lactide, and then ring-opening polymerize the lactide to obtain polylactic acid. This method obtains PLA with higher molecular weight and better thermal stability, but the indirect method requires high-purity lactide, and the production process is complicated, resulting in high price of polylactic acid, which makes it d...

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 Patents(China)
IPC IPC(8): C08G63/06C08G63/80C08G63/84
Inventor 樊玲于波栾怡娴何勇
Owner 萘琪沃克有限责任公司
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