http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-109280160-B
Outgoing Links
| Predicate | Object |
|---|---|
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G64-307 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G64-305 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G64-30 |
| filingDate | 2017-07-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2020-10-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 2020-10-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-109280160-B |
| titleOfInvention | Method for preparing polycarbonate by ionic liquid catalysis |
| abstract | The invention relates to an ionic liquidA process for the catalytic preparation of polycarbonates, characterized in that a heterocyclic nitrogen-containing ionic liquid is used as catalyst in an amount of 5X 10 times the amount of the dihydroxy compound ‑3 5 percent of dihydroxy compound and carbonic acid diester are used as raw materials, the molar ratio of dihydroxy compound to carbonic acid diester is 1:0.8-1:10, and the corresponding polycarbonate is obtained by melt polymerization. The synthesis process of the polycarbonate is divided into two stages of ester exchange and polycondensation: in the ester exchange stage, a prepolymer is obtained under the conditions of reaction temperature of 90-180 ℃, normal pressure and reaction time of 0.05-6 h; the polycondensation stage is that the prepolymer is processed at the temperature of 200 ℃ and 270 ℃ under the vacuum degree of 4.0 multiplied by 10 ‑3 MPa‑1.0×10 ‑5 And (4) synthesizing under the conditions of MPa and the reaction time of 0.05-7h to obtain the polycarbonate. The synthesis method has the advantages that the catalyst component is simple, and the molecular structure can be designed; the catalyst has strong alkalinity and high activity; the by-product can be recycled, so that the cost is reduced; the synthesis method does not use highly toxic phosgene, does not need a solvent, generates few three wastes and accords with the concept of clean production. |
| priorityDate | 2017-07-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 139.