Catalyst for copolymerization of carbon dioxide and epoxy and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-11965061-B2
Application number	US-202217876498-A
Country	US
Kind code	B2
Filing date	Jul 28, 2022
Priority date	Nov 22, 2021
Publication date	Apr 23, 2024
Grant date	Apr 23, 2024

Abstract

A ternary composite catalyst of diethylzinc and yttrium trifluoroacetate loaded on chitin for copolymerization of carbon dioxide, epoxy cyclohexane and ethylene oxide is provided. The ternary composite catalyst exhibits strong catalytic activity for the ternary copolymerization of carbon dioxide, cyclohexane oxide and ethylene oxide. A high molecular weight and content of ester chain is maintained. Conventional rare earth ternary catalysts leave residues in the polymer, and the polymer requires rinsing with hydrochloric acid. The ternary composite catalyst can be removed through filtration. The average molecular weight of the resulting polycarbonate is more than 100,000, and the ester chain content is more than 90%. The resulting polymer has a lower metal content. The ternary composite catalyst can be used in agricultural film, disposable packaging and other polymer materials.

First claim

What is claimed is:

1. A catalyst for copolymerization of carbon dioxide and epoxy comprising:
the catalyst being a ternary composite catalyst of diethylzinc and yttrium trifluoroacetate loaded on chitin, the ternary composite catalyst is a composite compound formed by the reaction of diethylzinc and hydroxyl groups on chitin and a complexation with yttrium trifluoroacetate.

2. The catalyst for copolymerization of carbon dioxide and epoxy of claim 1 , wherein the catalyst is prepared by:
adding diethylzinc, yttrium trifluoroacetate, chitin and tetrahydrofuran into a closed reactor with magnetic stirring in nitrogen atmosphere to react and form a mixture; and
distilling and concentrating the mixture to obtain the ternary composite catalyst of diethylzinc and yttrium trifluoroacetate loaded on chitin.

3. The catalyst for copolymerization of carbon dioxide and epoxy of claim 2 , wherein the molar ratio of diethylzinc, yttrium trifluoroacetate and chitin is 20:1:5 to 20.

4. The catalyst for copolymerization of carbon dioxide and epoxy of claim 2 , wherein 20 ml of tetrahydrofuran is added to every 0.01 mol of diethyl zinc.

5. The catalyst for copolymerization of carbon dioxide and epoxy of claim 2 , wherein the magnetic stirring is performed under a condition of 200 to 400 r/min stirring at 60° C. for 2.5 hours.

6. A method for catalyzing the copolymerization of carbon dioxide, epoxy cyclohexane and ethylene oxide to prepare polycarbonate using the ternary composite catalyst of diethylzinc and yttrium trifluoroacetate loaded on chitin of claim 1 , comprising:
adding the ternary composite catalyst of diethylzinc and yttrium trifluoroacetate loaded on chitin of claim 1 , cyclohexane oxide, ethylene oxide and tetrahydrofuran into a dry 300-ml high-pressure reactor under nitrogen atmosphere;
introducing carbon dioxide and adjusting a pressure to 4 MPa; and
stirring at 80° C. for 9 hours at 1000 r/min to obtain polycarbonate.

7. The method of claim 6 , wherein the molar ratio of cyclohexane oxide, ethylene oxide and the diethylzinc of the ternary composite catalyst is 20:5:0.25 to 2.

8. The method of claim 6 , wherein 5 ml of tetrahydrofuran is added to each 0.1 mol of cyclohexane oxide.

Assignees

• Univ Changzhou

Inventors

• Chen Qun
• He Mingyang
• Qian Junfeng
• Chen Shengchun
• Sun Zhonghua
• Zhou Weiyou
• Ji Zenan

Classifications

• C08G64/34 Primary

  and cyclic ethers · CPC title

• C08G64/0208 Primary

  saturated · CPC title

• C08G2310/00

  Agricultural use or equipment · CPC title