Zinc catalyst applicable to controllable depolymerization of polyester material and catalytic method thereof
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A technology of polyester material and zinc catalyst, which is applied in the field of polyester depolymerization, can solve the problem of increasing synthesis steps, and achieve the effect of simple catalyst structure, less synthesis steps and good universality
Active Publication Date: 2020-12-15
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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[0006] The present invention aims at the problem that the zinc catalyst used in the alcoholysis of the existing waste polyester material needs to synthesize complex ligands, and the number of synthesis steps is increased, and provides a zinc catalyst and its catalytic method using the controllable depolymerization of polyester material
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Embodiment 1
[0031] Example 1: Depolymerization of poly-β-butyrolactone. The reaction process is as follows:
[0032]
[0033] Take a 5mL Schlenk bottle, roast it and replace the argon, then add 86mg of poly-β-butyrolactone (Mn=5400g / mol, PDI=1.16) in the glove box, and then add 3.9mg of Zn[N(SiMe 3 ) 2 ] 2 Catalyst, outside the glove box, add 1mL of methanol, and stir at room temperature for reaction. After 24 hours of reaction, the reaction system was detected by NMR, and the conversion rate of the polymer was 93%, and the obtained alcoholysis product was methyl 3-hydroxybutyrate.
Embodiment 2
[0034] Example 2: Depolymerization of polylactide. The reaction process is as follows:
[0035]
[0036] Take a 5mL Schlenk bottle, smoke and roast it and replace the argon, then add 144mg of polylactide (Mn=11300g / mol, PDI=1.17) in the glove box, and then add 7.7mg of Zn[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.
Embodiment 3
[0037] Example 3: Depolymerization of polylactide. The reaction process is as follows:
[0038]
[0039] Take a 5mL Schlenk bottle, smoke and roast it and replace the argon, then add 11.0g polylactide (Mn=49900g / mol, PDI=1.13) in the glove box, and then add 550mg of Zn[N(SiMe 3 ) 2 ] 2 Catalyst, outside the glove box, add 30mL of methanol, and stir at room temperature for reaction. After reacting for 40 minutes, the NMR detection of the reaction system showed that the polymer conversion rate was 99%, and the obtained alcoholysis product was methyl lactate. Remaining methanol was removed by distillation to obtain 14.2 g of methyl lactate with a yield of 92%.
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Abstract
The invention discloses a zinc catalyst applicable to controllable depolymerization of a polyester material and a catalytic method thereof, and belongs to the technical field of polyester depolymerization. The problems that an existing zinc catalyst used for alcoholysis of waste polyester materials needs to synthesize complex ligands, and the number of synthesis steps is increased are solved. Thecatalyst adopted by the invention is a bis(hexaalkyldisilazane)zinc catalyst with a simple structure, and under the participation of an alcohol compound, the polyester material can be depolymerized into small organic molecules under mild conditions through the transesterification reaction catalyzed by the catalyst, so that the reutilization of waste polyester is realized. The zinc catalyst is adopted to catalyze polyester depolymerization, metal zinc is non-toxic, colorless, cheap and easy to obtain and serves as one of the microelements of a human body, biocompatibility is good, and the production process is more environmentally friendly; the catalyst is simple in structure, few in synthesis steps and more economical in production cost. The catalyst has very good universality, and has a very good depolymerization effect on various polyester materials with different structures.
Description
technical field [0001] The invention relates to a zinc catalyst using polyester materials for controllable depolymerization and a catalytic method thereof, belonging to the technical field of polyester depolymerization. Background technique [0002] Due to the advantages of excellent biocompatibility and biodegradability, polyester materials can be used as a substitute for traditional petroleum-based polymers, and have been widely used in biomedicine, packaging materials, agricultural production, etc. more attention. However, the mass-produced polyester materials have also caused people to think about the post-processing of waste polyester. Although polyester, as a degradable polymer, can degrade into carbon dioxide and water, this usually requires specific harsh environmental conditions and takes a long time. Seeking an efficient and convenient way to realize post-processing of polyester materials is an environmental problem that needs to be solved urgently. [0003] The...
Claims
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