Semi-aromatic polyamide resin and preparation method thereof
A polyamide resin and semi-aromatic technology, which is applied in the field of semi-aromatic polyamide resin and its preparation, can solve the problems of inability to prepare by polyamide polymerization process, difficult to form thin walls, easy to warp products, etc., and achieve excellent fluidity , Low water absorption, good mechanical properties
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[0032] Example 1
[0033] 2.02 kg of sebacic acid, 20 g of stearic acid, and 5 g of phosphoric acid were put into a jacketed reactor equipped with a stirrer, a separator, a cooler, a thermometer, a dropping tank, and a nitrogen introduction pipe. Inert gas is introduced into the reactor to remove the air in the reactor and maintain the pressure of the reactor at 0.2Mpa. Heat the reactor to increase the temperature of the reactor to 240°C, turn on the stirring, and the stirring speed is 60 rpm. Then, molten p-xylylenediamine was slowly added to the reaction vessel, and the temperature of the reaction vessel was slowly raised to 290°C. The dripping process took 120 minutes. During the dripping process, the reactor pressure was maintained at 0.2 MPa, and the generated water was discharged out of the reaction system through a separator and a cooler. The temperature of the condenser is controlled in the range of 140-150℃. After adding 1.36 kg of p-xylylenediamine, stop feeding. S...
Example Embodiment
[0034] Example 2
[0035] 2.30 kg of dodecanedioic acid, 20 g of stearic acid, and 5 g of phosphorous acid were put into a jacketed reactor equipped with a stirrer, a condenser, a cooler, a thermometer, a drip tank and a nitrogen introduction pipe. Inert gas is introduced into the reaction vessel, the air in the reaction vessel is removed, and the pressure of the reaction vessel is maintained at 0.3 MPa. Heat the reactor to increase the temperature of the reactor to 230°C, turn on the stirring, and the stirring speed is 60 rpm. Then, molten p-xylylenediamine was slowly added to the reaction vessel, and the temperature of the reaction vessel was slowly raised to 290°C. The dripping process took 120 minutes. During the dripping process, the reactor pressure was maintained at 0.3 MPa, and the generated water was discharged out of the reaction system through the partial condenser and the cooler. The temperature of the condenser is controlled in the range of 140-150℃. After adding...
Example Embodiment
[0036] Example 3
[0037] 2.58 kg of myristic acid, 20 g of stearic acid, and 5 g of sodium hypophosphite were put into a jacketed reaction kettle equipped with a stirrer, a separator, a cooler, a thermometer, a dropping tank and a nitrogen introduction pipe. Inert gas is introduced into the reactor to remove the air in the reactor and maintain the pressure of the reactor at 0.4 MPa. The reactor was heated to raise the temperature of the reactor to 220°C, and the stirring was turned on, and the stirring speed was 60 rpm. Then, molten p-xylylenediamine was slowly added to the reaction vessel, and the temperature of the reaction vessel was slowly raised to 290°C. The dripping process took 120 minutes. During the dripping process, the reactor pressure was maintained at 0.4 MPa, and the generated water was discharged out of the reaction system through the partial condenser and the cooler. The temperature of the condenser is controlled in the range of 140-150℃. After adding 1.36 k...
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