A zinc catalyst for controlled depolymerization using polyester materials and its catalytic method
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A technology of polyester material and zinc catalyst is applied in the field of polyester depolymerization, which can solve the problems of increasing synthesis steps, and achieve the effects of simple catalyst structure, good depolymerization effect and good universality.
Active Publication Date: 2021-07-23
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 using polyester materials for controllable depolymerization and a catalytic method thereof, belonging to the technical field of polyester depolymerization. The invention solves the problem that complex ligands need to be synthesized for the zinc catalyst used in the alcoholysis of existing waste polyester materials, and the synthesis steps are increased. The catalyst used in the present invention is a bis(hexaalkyldisilazane) zinc catalyst with a simple structure. With the participation of alcohol compounds, the polyester material can be decomposed under mild conditions through the transesterification reaction catalyzed by the catalyst. Polymerization into small organic molecules realizes the reuse of waste polyester. The invention adopts a zinc catalyst to catalyze the depolymerization of the polyester, the metal zinc is non-toxic, colorless, cheap and easy to obtain, and as one of the trace elements of the human body, it has good biocompatibility, and the production process is more green and environmentally friendly; and the catalyst structure is simple and the synthesis steps Less, the production cost is more economical. The catalyst has good universality, and has good depolymerization effects 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
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
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