Preparation of polybutane diacid butanediol ester
A technology of polybutylene succinate and succinic acid, which is applied in the field of preparing polybutylene succinate, can solve the problems of low molecular weight, performance that cannot meet the actual use requirements, and small equilibrium constants.
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Embodiment 1
[0015] A total of 416 grams of succinic acid and butanediol are placed in the reaction device, wherein the molar ratio of succinic acid to butanediol is 1: 1, and the esterification reaction is carried out at a temperature of about 160° C., and then The polybutylene succinate was obtained by polycondensation at a temperature of 205° C. and reduced pressure to 30 Pa in the presence of p-toluenesulfonic acid for 7 hours; wherein, the amount of p-toluenesulfonic acid was 0.42 g. The weight average molecular weight M of the obtained polybutylene succinate w 48,000, molecular weight distribution M w / M n is 1.7.
Embodiment 2
[0017] A total of 506 grams of succinic acid and butanediol are placed in the reaction device, wherein the molar ratio of succinic acid and butanediol is 1.5: 1, and the normal pressure esterification reaction is carried out at a temperature of 150 ° C, and then The temperature is 235°C, and antimony trioxide and titanate are added successively, the pressure is reduced to 30Pa for polycondensation, and the reaction is 6 hours to obtain polybutylene succinate; among them, the total amount of antimony trioxide and titanate is 0.26 grams. The weight average molecular weight M of the obtained polybutylene succinate w 91,000, molecular weight distribution M w / M n is 2.1.
Embodiment 3
[0019] A total of 390 grams of succinic acid and butanediol are placed in the reaction device, wherein the molar ratio of succinic acid to butanediol is 3: 1, and the esterification reaction is carried out at a temperature of about 160° C., and then At a temperature of 270°C, organotin and cadmium acetate were added successively, reduced pressure to 30Pa for polycondensation, and reacted for 9 hours to obtain polybutylene succinate; wherein, the total amount of organotin and cadmium acetate used was 0.40 grams. The weight average molecular weight M of the obtained polybutylene succinate w 137,000, molecular weight distribution M w / M n is 1.9. The mechanical properties are shown in Table 1.
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