http://rdf.ncbi.nlm.nih.gov/pubchem/patent/KR-100194444-B1
Outgoing Links
| Predicate | Object |
|---|---|
| filingDate | 1996-09-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 1999-06-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1999-06-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | KR-100194444-B1 |
| titleOfInvention | Method for producing expanded polystyrene beads |
| abstract | The present invention relates to a method for producing expanded polystyrene beads which can shorten the reaction time while increasing the polymerization temperature in steps to reduce the content of unreacted monomers.n n n Method for producing expanded polystyrene beads according to the invention, (1) a styrene monomer, a dispersion medium, a dispersant, a surfactant, a nucleating agent and an initiator are added to the polymerization tank, the first heating step of heating and stirring at a temperature of 50 ~ 70 ℃; (2) a second heating step of inducing main polymerization by heating the temperature of the polymerization tank to a temperature of 71 to 90 ° C. after the first heating step; (3) When the polymerization rate of the styrene monomer in the second heating step is 65 to 85% by weight, the polymerization tank is sealed, the temperature of the polymerization tank is heated to a temperature of 91 to 110 ° C, and the blowing agent is introduced into the polymerization tank. A third heating step of impregnation; (4) a fourth heating step of heating to a temperature of 111 to 130 ° C. in order to sufficiently polymerize the unpolymerized styrene monomer after the third heating step; And (5) cooling the temperature of the polymerization tank to a temperature of room temperature to 40 ° C, removing the residual pressure in the polymerization tank, and then recovering the foamed polystyrene beads, washing, and drying.n n n Therefore, by controlling the polymerization temperature by heating it in four stages without changing or modifying the existing production facilities, the reaction time can be shortened while maintaining high molecular weight, even molecular weight distribution and low unreacted styrene monomer. There is an effect that a stable dispersed phase expanded polystyrene beads having properties of containing can be obtained. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/KR-101243271-B1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/KR-101099028-B1 |
| priorityDate | 1996-09-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 82.