Crystallized self-refining polyester and preparation method thereof
A self-refining polyester and crystallization technology, which is applied in the field of crystalline self-refining polyester and its preparation, can solve the problems such as the decrease of the molecular weight of polyester, and achieve the effect of improving the crystallization rate, avoiding the decline of polyester performance and improving the mechanical strength.
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[0023] A kind of preparation method of crystalline self-refinement polyester provided by the invention comprises the following steps:
[0024] (1) Add diacid monomer, diol monomer, sodium sulfosalicylate and antimony-based catalyst into the reaction kettle and stir and mix. Under the protection of nitrogen, adjust the temperature in the reaction kettle to 225-235°C for esterification. Chemical reaction;
[0025] (2) After the esterification reaction is finished, the temperature in the reactor is adjusted to 245-275° C., and the polycondensation reaction is carried out after vacuumizing to obtain a polymer melt;
[0026] (3) Fill the reaction kettle with nitrogen until the polymer melt forms a steady trickle, cool in a water tank, cut into pellets with a pelletizer, and dry with a blower to obtain crystalline self-refinement polyester.
[0027] Specifically, in the present invention, the diacid monomer, diol monomer, sodium sulfosalicylate and catalyst are sequentially added t...
Embodiment 1
[0034] (1) Turn on the reactor, set it to run at a low speed, stir at 25Hz, mix 63.66g terephthalic acid (M=166.13), 33.3g ethylene glycol (M=62.068), 3g sodium sulfosalicylate, 0.04g Ethylene glycol antimony is sequentially added to the reaction kettle whose temperature is controlled at 80°C, wherein the molar ratio of terephthalic acid and ethylene glycol is 1:1.4, the mass fraction of ethylene glycol antimony in the mixture is 0.04%, sulfosalicyl The mass fraction of sodium bicarbonate in the mixture is 3%, the order of addition is first liquid and then solid, and stir for 30 minutes;
[0035] (2) Increase the stirring power to 50 Hz, replace the air with nitrogen twice, then raise the temperature to the esterification reaction temperature of 230° C., and react for 4 hours;
[0036] (3) Continue to heat up to the polycondensation reaction temperature of 270°C, react for 1 hour, use a vacuum pump to evacuate, and use a needle valve to adjust the vacuuming speed. The vacuumin...
Embodiment 2
[0038] (1) Turn on the reactor, set it to run at a low speed, stir at 25Hz, mix 55.11g of terephthalic acid (M=166.13), 41.85g of butanediol (M=90.121), 3g of sodium sulfosalicylate, 0.04g Ethylene glycol antimony is added to the reaction kettle in turn, wherein the molar ratio of terephthalic acid and ethylene glycol is 1:1.4, the mass fraction of ethylene glycol antimony in the mixed solution is 0.04%, and sodium sulfosalicylate in the mixed solution The mass fraction in the mixture is 3%, the feeding sequence is first liquid and then solid, pre-beating for 30 minutes, and the stirring temperature is 80°C;
[0039](2) Increase the stirring power to 50 Hz, replace the air with nitrogen twice, then raise the temperature to the esterification reaction temperature of 230°C, and react for 10 hours;
[0040] (3) Continue to heat up to the polycondensation reaction temperature of 270°C, react for 2 hours, use a vacuum pump to evacuate, and use a needle valve to adjust the vacuuming...
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