| 配方类型： |
RUBBER, PLASTICS AND WAXES |
| 配方说明： |
Polyester Resin |
| 配方组成： |
Total charge:/2,654.3 kg
The ethylene glycol is first charged into the reaction kettle, and
agitation is started. At the same time, oxygen-free N2 gas or Co2 gas is
blown in slowly from the bottom of the kettle. After a temperature of
about 150'C has been reached, the fumaric acid is added, and then the
himic anhydride is added. Then the temperature is raised to 210'C. When
the temperature of 210'C has been reached, the flow rate of the inert
gas is increased, and the resin is maintained at the same conditions.
Every 30 minutes, the resin must be sampled and its acid value measured.
When the acid value has gone down to 40 or less, the resin is cooled
down to 150'C, and t-Butyl catechol 0.005% and hydroquinone 0.01% are
added as inhibitors. Styrene monomers are then added and dissolved until
the styrene content has become 36%. The flow of the inert gas must be
continued even during the dissolving, and the resin must not be allowed
to come i |
| 配制方法： |
The dipropylene glycol and trimethylol propane are put into the reaction kettle and are agitated while the inert gas is caused to bubble out slowly form the bottom of the kettle. After the temperature has been raised to about 80'C, the maleic anhydride is added, and the temperature will naturally rise about 20'c due to the exothermic reaction of the anhydride. Next, the himic anhydride is charged, and after two hours the temperature is raised to 195-205'C. The rate of flow of the inert gas is increased, and the resin is maintained at this temperature. The reaction is allowed to continue until the acid value has gone down to 30 or less.
Then the inhibitors and the styrene monomers are added in the same way as in the procedure for making Polyester 1, and the styrene content is made to be 45%. |
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