Production method for preparing polylactic acid by ring-opening polymerization method, prepolymer mixture and polylactic acid
A production method, a technology of ring-opening polymerization, applied in the field of prepolymer mixture and polylactic acid, which can solve the problems of high precision in the weighing of initiators and catalysts, difficult production of mixing, instability, etc.
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Embodiment 1
[0114] Production of prepolymer mixtures:
[0115] Add 59.1kg of 1,6-hexanediol, 941kg of L-lactide, and 6.8kg of stannous octoate into a 1500L stainless steel reactor to carry out ring-opening polymerization. The ring-opening polymerization was stirred and reacted at 180° C. for 45 minutes to obtain a prepolymer mixture A containing a polylactic acid prepolymer. When the monomer is converted at 100%, the theoretical number average molecular weight of the polylactic acid prepolymer is 2000. In the reaction system, the conversion rate is 97.1%, and the calculated content of L-lactide monomer in the prepolymer mixture A is 2.7wt%; the number average molecular weight of the polylactic acid prepolymer obtained in the prepolymer mixture A is 1945, The viscosity at 180° C. was 55 cp, and the Sn content was 0.2% (2000 ppm).
[0116] In this production process, the mass ratio of 1,6-hexanediol is: 59.1kg / (59.1kg+941kg)=5.9:100. The mass ratio of stannous octoate is: 6.8kg / (59.1kg+9...
Embodiment 2
[0126] Production of prepolymer mixtures:
[0127] Add 59.1kg of 1,6-hexanediol, 941kg of L-lactide, and 6.8kg of stannous octoate into a 1500L stainless steel reactor to carry out ring-opening polymerization. The ring-opening polymerization was stirred and reacted at 180° C. for 45 minutes to obtain a prepolymer mixture A containing a polylactic acid prepolymer. When the monomer is converted at 100%, the theoretical number average molecular weight of the polylactic acid prepolymer is 2000. In the reaction system, the conversion rate is 97.1%, and the calculated content of L-lactide monomer in the prepolymer mixture A is 2.7wt%; the number average molecular weight of the polylactic acid prepolymer obtained in the prepolymer mixture A is 1945, The viscosity at 180° C. was 55 cp, and the Sn content was 0.2% (2000 ppm).
[0128] In this production process, the mass ratio of 1,6-hexanediol is: 59.1kg / (59.1kg+941kg)=5.9:100. The mass ratio of stannous octoate is: 6.8kg / (59.1kg+9...
Embodiment 3
[0137] Production of prepolymer mixtures:
[0138] In the first plug-flow tubular reactor, the reaction materials are continuously added and the products are continuously extracted. The flow of each reaction material is as follows: the flow of trimethylolpropane (TMP) is 11.2kg / h, L-lactide The flow rate of stannous octoate is 88.8kg / h, and the flow rate of stannous octoate is 1.36kg / h; each reaction material is subjected to ring-opening polymerization at 160°C, and the reaction residence time is 45min to obtain a prepolymer mixture containing polylactic acid prepolymer b. When the monomer is converted at 100%, the theoretical number average molecular weight of the polylactic acid prepolymer is 1200. In the reaction system, the conversion rate is 93.5%, and the calculated content of L-lactide monomer in the prepolymer mixture B is 5.8wt%; the number average molecular weight of the polylactic acid prepolymer obtained in the prepolymer mixture B is 1131, The viscosity at 180° ...
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