A kind of polyoxalate synthesis process
A synthesis process, polyoxalate technology, applied in the chemical field, can solve problems such as environmental pollution, poor natural degradability, etc., and achieve the effect of improving safety performance and reducing temperature
Active Publication Date: 2017-06-16
NINGBO ZHETIE DAPHOON CHEM
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Problems solved by technology
At the same time, the polycarbonate has poor natural degradability, and once it is discarded, it will cause great pollution to the environment.
Method used
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Embodiment Construction
[0016] refer to figure 1 Embodiments of the present invention will be further described.
[0017] A kind of polyoxalate synthesis technique, comprises the following steps:
[0018] Step 1, melting dimethyl oxalate at a temperature of 54°C to 59°C and a pressure of 100kPa to 150kPa, uniformly mixing bisphenol A and isosorbide with the molten dimethyl oxalate to form a mixture, During this process, the molar ratio of dimethyl oxalate to bisphenol A is 0.90-1.35, and the molar ratio of dimethyl oxalate to isosorbide is 0.95-1.5;
[0019] Step 2. Add 18% MoO treated with acetic acid to the two mixtures in step 1 3 / 6%TiO 2 -SiO 2 Catalyst, and keep the temperature of the two mixtures at 65 ℃ ~ 70 ℃, the pressure is 5kPa ~ 60kPa for esterification reaction, 18% MoO treated with acetic acid 3 / 6%TiO 2 -SiO 2 The molar ratio of catalyst to dimethyl oxalate is 1×10 -9 ~5×10 -5 ;
[0020] Step 3, mixing the two mixtures after the esterification reaction in step 2 again to obt...
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Abstract
The invention discloses a polycarbonate synthesis process. According to the process, bisphenol A and isosorbide are each evenly mixed with dimethyl oxalate in a molten state for esterification reaction; a reaction product obtained after esterification of the bisphenol A and the dimethyl oxalate and a reaction product obtained after esterification of the isosorbide and the dimethyl oxalate are subjected to polymerization to obtain bisphenol A-isosorbide copolymer polycarbonate. In a chain segment of the bisphenol A-isosorbide copolymer polycarbonate, the bisphenol A and the isosorbide are ranked irregularly; since the isosorbide is a biomass product and the activity of secondary carbon carbonyl in the isosorbide is lower than that of phenol carbonyl in the bisphenol A, the ester group formed by the isosorbide and the dimethyl oxalate is more prone to fracture under the effects of microorganisms or degrading enzymes. However, the isosorbide is of a chiral structure, so the obtained bisphenol A-isosorbide copolymer polycarbonate can guarantee the rigidity of bisphenol A polycarbonate, is suitable for being applied to such fields as automobiles, electricity, construction and packaging, and will not cause pollution to the natural environment.
Description
technical field [0001] The invention relates to the field of chemistry, in particular to a polyoxalate synthesis process. Background technique [0002] Polycarbonate (referred to as PC) is a high molecular polymer containing carbonate groups in the molecular chain. According to the structure of the ester group, it can be divided into aliphatic, aromatic, aliphatic-aromatic and other types. Among them, the low mechanical properties of aliphatic and aliphatic-aromatic polycarbonates limit their application in engineering plastics. At present, only aromatic polycarbonate has been produced industrially. Due to the special structure of polycarbonate, it has become the fastest-growing general-purpose engineering plastic among the five major engineering plastics. [0003] For example, the polycarbonate produced by the Chinese patent "A Preparation Method of Polycarbonate" with the application number 201310560220.5 is bisphenol A polycarbonate, which has good mechanical properties...
Claims
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IPC IPC(8): C08G64/16C08G64/38
Inventor 傅建永施懿军周志峰邱琪浩王晨晔吴召伟周浩蔡裕杰
Owner NINGBO ZHETIE DAPHOON CHEM