A kind of preparation method and polymerization reaction system of biodegradable polyester
A technology for degrading polyester and polymerization, applied in chemical/physical/physical-chemical stationary reactors, chemical/physical/physical-chemical mobile reactors, etc., can solve the problems of high molecular weight and slow reaction rate, and achieve molecular weight High, simple method, uniform viscosity effect
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Embodiment 1
[0050] A preparation method of a biodegradable polyester using the above-mentioned polymerization reaction system, wherein in the polymerization reaction system, the stirring form of the reaction kettle 1 is an anchor type, the reaction kettle 2 is a double-cone rotary dryer, and the cooling liquid is a temperature of 2 ° C. water;
[0051] Specific steps are as follows:
[0052] (1) adding stannous octoate, stearyl alcohol and reaction raw materials (mass ratio is the mixture of the L-lactide and glycolide of 2.19:0.31) after mixing and adding in the reactor 1, and sealing, the reactor 1 is pumped Vacuum, then fill with argon gas, and then vacuumize, do this for 3 times, and carry out the reaction to obtain a prepolymer with an intrinsic viscosity of 0.8dL / g; the addition of stannous octoate is 100ppm of the reaction raw materials; the addition of stearyl alcohol is 200 ppm of the reaction raw materials; the reaction temperature of the reaction raw materials in the reaction ...
Embodiment 2
[0057] A method for preparing a biodegradable polyester using the above-mentioned polymerization reaction system, wherein in the polymerization reaction system, the stirring form of the reaction kettle 1 is an anchor type, the reaction kettle 2 is a double-cone rotary dryer, and the cooling liquid is a temperature of -20 ℃ of ethanol;
[0058] Specific steps are as follows:
[0059] (1) adding stannous octoate, dodecanol and reaction raw materials (mass ratio is the mixture of the L-lactide and glycolide of 2.19:0.31) after mixing and adding in the reactor 1, and sealing, the reactor 1 is pumped Vacuum, then fill with argon, and then vacuumize again, and do this for 3 times, and carry out the reaction to obtain a prepolymer with an intrinsic viscosity of 2.2dL / g; the addition of stannous octoate is 30ppm of the reaction raw materials; the addition of dodecanol It is 150ppm of the reaction raw materials; the reaction temperature of the reaction raw materials in the reaction ke...
Embodiment 3
[0064] A preparation method of a biodegradable polyester using the above-mentioned polymerization reaction system, wherein in the polymerization reaction system, the stirring form of the reaction kettle 1 is a frame type, the reaction kettle 2 is a double-cone rotary dryer, and the cooling liquid is a temperature of 8 ° C. water;
[0065] Specific steps are as follows:
[0066] (1) adding stannous octoate, ethylene glycol and reaction raw materials (mass ratio is the mixture of L-lactide and caprolactone of 2:0.34) after mixing, join in reactor 1, and seal, and vacuumize reactor 1 , then filled with argon, and then evacuated, so operated 3 times, and reacted to obtain a prepolymer with an intrinsic viscosity of 1.6dL / g; the addition of stannous octoate was 100ppm of the reaction raw materials; the addition of ethylene glycol was 200ppm of the reaction raw materials; the reaction temperature of the reaction raw materials in the reaction kettle 1 is 180 ° C, the pressure is 1.2...
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