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Green preparation method of renewable polycarbonate

A technology of polycarbonate and dicarbonate, which is applied in the field of renewable resource utilization and green synthesis, can solve the problems of restricting the application of renewable resources, and achieve the effects of green and environmentally friendly synthesis methods, novel monomers, and reduced production costs

Active Publication Date: 2017-05-24
TIANJIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, there are no reports on the synthesis of polycarbonate using derived monomers derived from citric acid from renewable resources, thus limiting the application of renewable resources in polycarbonate production.

Method used

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Embodiment

[0024] In the present invention, citric acid and carbonate are used as raw materials, and lithium acetylacetonate is used as a catalyst to realize bulk polymerization under high temperature and high vacuum conditions. The steps are as follows:

[0025] 1) prepare acetone dicarboxylate dimethyl by citric acid

[0026] Add 60g (0.60mol) of concentrated sulfuric acid into a round bottom flask, slowly add 14g of citric acid monohydrate under ice-cooling, then slowly raise the temperature to 30°C within 8h, and react at this temperature for 18h. Then 40ml of dichloromethane was added sequentially under ice-bath conditions, 40ml of methanol was added below 20°C, and stirred at room temperature for 12h. Then add 240ml of ice water, stir for 0.5h, let stand to separate layers, keep the organic phase, extract the water layer with 3×40ml of dichloromethane and combine the organic layer, then wash with saturated sodium chloride solution and saturated sodium bicarbonate solution, Drying ...

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Abstract

The invention relates to a green preparation method of renewable polycarbonate. According to the method, citric acid and carbonic ester are taken as raw materials, lithium acetylacetonate is taken as a catalyst, and bulk polymerization is realized under the conditions of high temperature and high vacuum. The method comprises the following steps: (1) using the citric acid to prepare dimethyl acetone dicarboxylate; (2) using the dimethyl acetone dicarboxylate to prepare octahydro-pentalene-2,5-diol and dimethyl (octahydro-pentalene-2,5 diyl) dicarbonate; (3) synthesizing the polycarbonate by using the dimethyl (octahydro-pentalene-2,5 diyl) dicarbonate and different renewable aliphatic diols (including chain type and ring type). The green preparation method has the advantages that the raw materials are low in price and wide in source; furthermore, the preparation method is simple in synthetic process, environment-friendly and degradable in products, and is beneficial to realization of industrial production and structure and function diversification.

Description

technical field [0001] The invention relates to the technical field of renewable resource utilization and green synthesis, in particular to a green preparation method of renewable polycarbonate. Background technique [0002] Polycarbonate (PC) is a thermoplastic engineering plastic with excellent comprehensive properties. It has excellent impact resistance and good dimensional stability, and has strong heat resistance and cold resistance, so it can be used in a wide range of - It is used in the temperature range of 100-140°C, and has excellent dielectric properties and good light transmittance (the transmittance of visible light can reach 90%). It is the only product with good transparency among the five major engineering plastics. The fastest growing general engineering plastics. Polycarbonate is widely used in various fields of national economic development, for example, it is widely used in optics, electronics, automobiles, construction, office equipment, packaging, spor...

Claims

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Application Information

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IPC IPC(8): C08G64/30
CPCC08G64/305
Inventor 庞成才刘晓晗高辉马建标
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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