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Molded polyurethane production process has the characteristics of what?A, poly system 1, take a certain amount of N in the kettle, rose to a temperature of 130 ℃, and at this temperature vacuum 4 hours (vacuum > 0.07 MPA);
2, down to 55 ℃ temperature, phosphoric acid, stirring for 10 minutes;
3, then slowly add the T, and while stirring (10 minutes), the natural heat, stir not only of pumping air into vacuum state, make its natural response for an hour, and then keep the temperature at 85 ℃, stirring vacuum for an hour, the reaction to the above pre polymers; Pre polymers seal to keep 24 hours, before pouring.
Second, the casting
1, the pre polymers heat up to 85 ℃, and the vacuum deaeration 45 minutes, stirring;
2, put the mould in the drying oven temperature to 120 ℃, keep more than half an hour.
Step 3, 1, 2, after the completion of take a certain amount of MOCA melting ? in electric furnace
Second, the casting
1, the pre polymers heat up to 85 ℃, and the vacuum deaeration 45 minutes, stirring;
2, put the mould in the drying oven temperature to 120 ℃, keep more than half an hour.
Step 3, 1, 2, after the completion of take a certain amount of MOCA in electric furnace melting and pour into computing good pre polymers, quick stir, stir, pour into of the mould preheating, stay a few minutes after curing, put into the oven, aged with constant temperature of 120 ℃ for one hour, can the mold, this is a cure;
4, several pieces of a cure will be a good job in the oven, temperature 85 ℃, then curing four hours is the finished product.
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