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Aliphatic polycarbonate preparation method

A polycarbonate and aliphatic technology, which is applied in the field of preparation of aliphatic polycarbonate, can solve the problems affecting the industrialization process of carbon dioxide and propylene oxide copolymer, the color of the polymer, and the large pressure loss, so as to improve the utilization of equipment The effect of increasing the polymerization rate, increasing the polymerization temperature and reducing the reaction time

Active Publication Date: 2019-04-23
联泓格润(山东)新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The longer reaction time greatly limits the process selection of carbon dioxide and propylene oxide polymerization. Due to the large increase in the viscosity of the system, if the reaction time is long and the pressure loss is too large, it is difficult to use continuous polymerization processes such as plug-flow reactors. Seriously affected the industrialization process of carbon dioxide and propylene oxide copolymer
[0005] Chinese patent CN 201180004210 provides a salen catalyst system, which can obtain carbon dioxide-alkylene oxide copolymer in a short polymerization time, but due to the presence of nitro groups in the catalyst, the polymer is colored and difficult to remove

Method used

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[0030] The invention provides a method for preparing aliphatic polycarbonate, which can be realized by appropriately improving process parameters for reference by those skilled in the art. In particular, it should be pointed out that all similar substitutions and modifications are obvious to those skilled in the art, and they all belong to the protection scope of the present invention. The method and application of the present invention have been described through preferred embodiments, and relevant personnel can obviously make changes or appropriate changes and combinations to the method and application herein without departing from the content, spirit and scope of the present invention to realize and apply the present invention Invent technology.

[0031] The invention provides a kind of preparation method of aliphatic polycarbonate, comprising

[0032] A heterogeneous catalyst is used to polymerize carbon dioxide, propylene oxide and comonomers at a certain temperature and...

Embodiment 1

[0066] A ternary rare earth catalyst synthesized according to the method provided by Chinese patent ZL 03105023.9; and put into the catalyst at a mass ratio of diethylzinc:propylene oxide of 1:100 to obtain the third monomer: glycidyl methacrylate and styrene copolymer (Molecular weight: 7kg / mol, epoxy equivalent 350g / equivalent) 1kg, put into a 500L polymerization kettle, add 200kg of propylene oxide, 85kg of carbon dioxide, heat to 100°C, the pressure can reach up to 4.3MPa, start timing, and maintain the reaction temperature of 100°C Reaction 5h.

[0067] Cooling water was passed into the internal cooling coil, and after cooling to 30°C rapidly, unreacted propylene oxide and carbon dioxide were removed to obtain 130 kg of carbon dioxide-propylene oxide copolymer and 10.2 kg of cyclic carbonate. Using styrene as the standard sample and dichloromethane as the mobile phase, the weight-average molecular weight of the carbon dioxide-propylene oxide copolymer was measured to be 5...

Embodiment 2

[0069] According to the method of Chinese patent ZL 201510859248.8, the dicarboxylic acid catalyst was prepared, and the catalyst was put into the catalyst according to the catalyst: propylene oxide mass ratio of 1:100, and the third monomer: glycidyl methacrylate copolymer (molecular weight: 20kg / mol, ring Oxygen equivalent (150g / equivalent) 0.2kg, put into a 500L polymerization kettle, add 200kg of propylene oxide, 80kg of carbon dioxide, heat to 120°C, the pressure reaches up to 5.2MPa, start timing, and maintain the reaction temperature of 120°C for 2h.

[0070] Cooling water was passed into the internal cooling coil, and after cooling to 30°C rapidly, unreacted propylene oxide and carbon dioxide were removed to obtain 104 kg of carbon dioxide-propylene oxide copolymer and 5.2 kg of cyclic carbonate. Styrene was used as the standard sample, dichloromethane was used as the mobile phase to measure the molecular weight of the product, and the content of propylene carbonate and...

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Abstract

The invention provides an aliphatic polycarbonate preparation method, which includes adopting a heterogeneous catalyst to polymerize carbon dioxide, propylene oxide and a comonomer to obtain aliphaticpolycarbonate, wherein the comonomer comprises a copolymer of one or more of styrene, acrylonitrile or vinyl acetate and glycidyl methacrylate or a glycidyl methacrylate homopolymer. According to themethod, the comonomer is introduced in the copolymerization process of carbon dioxide and propylene oxide to preform copolymerization, and thus the polymerization temperature is increased, and the generation amount of byproducts is reduced, so that the reaction time is reduced, and the utilization rate of equipment is improved. An experimental result shows that the method can improve the reactionrate by 2-4 times, improve the utilization rate of equipment and reduce the investment and production cost on the premise of ensuring low byproducts and high molecular weight.

Description

technical field [0001] The invention relates to the technical field of organic synthesis, in particular to a preparation method of aliphatic polycarbonate. Background technique [0002] Carbon dioxide is a major greenhouse gas, and it is also a cheap carbon resource. Using carbon dioxide and epoxides as raw materials, the preparation of polymer polyester materials has the advantages of environmental protection and economy. ,1969) has attracted much attention. [0003] The reaction of carbon dioxide and epoxide is polymerized under the action of a catalyst to form polycarbonate. At present, the aliphatic epoxidation to realize industrialization is mainly propylene oxide. The catalysts that have been industrialized at present mainly include rare earth three-way catalyst system and zinc dicarboxylate Catalytic system, but in the process of catalyzing the polymerization of carbon dioxide and propylene oxide, the by-product cyclic carbonate will be generated. The higher the reac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G64/34C08G64/18C08G64/02
CPCC08G64/0208C08G64/18C08G64/34
Inventor 周庆海郭洪辰蔡毅王献红
Owner 联泓格润(山东)新材料有限公司
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