Method for catalytically depolymerizing polylactic acid and analogues thereof by magnesium catalytic system

A catalytic system and catalytic depolymerization technology, which is applied in the field of polyester depolymerization, can solve problems such as increased production costs and metal tin toxicity, and achieve the effects of economical production costs, fewer synthesis steps, and good biocompatibility

Pending Publication Date: 2021-12-07
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, metal tin has certain toxicity, and the high temperature condition makes the production cost increase

Method used

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  • Method for catalytically depolymerizing polylactic acid and analogues thereof by magnesium catalytic system
  • Method for catalytically depolymerizing polylactic acid and analogues thereof by magnesium catalytic system
  • Method for catalytically depolymerizing polylactic acid and analogues thereof by magnesium catalytic system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Depolymerization of PLA

[0030]

[0031] The experimental process includes the following steps:

[0032] Take a 5mL Schlenk bottle, roast it and replace the argon, then add 288mg polylactic acid (M n =26000g / mol, PDI=1.09), then add 3.8mg of Mg[N(SiMe 3 ) 2 ] 2 Catalyst, outside the glove box, add 2mL of methanol and 2mL of dichloromethane, and stir at room temperature for reaction. After reacting for 1.5 hours, the reaction system was detected by NMR, and the conversion rate of the polymer was 99%, and the obtained alcoholysis product was methyl lactate.

Embodiment 2

[0034] Depolymerization of PLA

[0035]

[0036] The experimental process includes the following steps:

[0037] Take a 500mL three-neck flask, roast it and replace the argon gas, add 16.32g of commercial polylactic acid product (manufacturer: Yiwu Shuangtong Commodity Co., Ltd.; diameter: 12mm) into the glove box, and then add 1.15g of polylactic acid Mg[N(SiMe 3 ) 2 ] 2 Catalyst, outside the glove box, add 113mL of methanol and 113mL of dichloromethane, stir and react at room temperature. After reacting for 2 hours, the NMR detection of the reaction system showed that the conversion rate of the polymer was 99%, and the obtained alcoholysis product was methyl lactate. Remaining methanol was removed by distillation to obtain 20.84 g of methyl lactate with a yield of 80%.

Embodiment 3

[0039] Depolymerization of PLA

[0040]

[0041] The experimental process includes the following steps:

[0042] Take a 5mL Schlenk bottle, roast it and replace the argon, then add 144mg polylactic acid (M n =11300g / mol, PDI=1.17), then add 7.0mg of Mg[N(SiMe 3 ) 2 ] 2 Catalyst, outside the glove box, add 1mL of methanol, and stir at room temperature for reaction. After reacting for 2 hours, the NMR detection of the reaction system showed that the conversion rate of the polymer was 99%, and the obtained alcoholysis product was methyl lactate.

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Abstract

The invention discloses a method for catalytically depolymerizing polylactic acid and analogues thereof by a magnesium catalytic system, which belongs to the technical field of polyester depolymerization. According to the method disclosed by the invention, under the catalysis of a bis (hexamethyldisilazane) magnesium or dibutyl magnesium catalyst, alcoholysis of polylactic acid and analogues thereof is realized in the presence of an alcohol compound to obtain small organic molecules, so that effective utilization of waste polylactic acid and analogues thereof is realized. The green and environment-friendly magnesium catalyst with a simple structure is adopted for catalysis, the process is green and environment-friendly, the reaction can be efficiently carried out under mild conditions, and the catalyst has good universality and has a good depolymerization effect on polylactic acid with various different structures and analogue materials thereof.

Description

technical field [0001] The invention relates to a method for catalyzing the depolymerization of polylactic acid and its analogs with a magnesium catalyst system, and belongs to the technical field of polyester depolymerization. Background technique [0002] Biomass materials based on aliphatic polyesters are perfect substitutes for petroleum-derived materials, which can be produced by biophotosynthesis from carbon dioxide, water and sunlight available in the atmosphere, and have been used to produce fuels and fine chemicals with net carbon emissions target of zero. Polyester materials, especially polylactic acid materials, are widely used in packaging materials and pharmaceutical industries due to their biocompatibility and degradability. Therefore, it has received more and more attention from all over the world. However, the large-scale production of polylactic acid materials has also caused people to think about the post-processing of waste polyester. Although polylacti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/03C07C69/68
CPCC07C67/03C07C69/68
Inventor 王庆刚徐广强周先悦
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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