Diamine-based metal catalyst as well as preparation method and application thereof
A catalyst and metal-based technology, which is applied in the field of diamine-based metal catalysts and their preparation, can solve the problems of high production cost, biotoxicity, and complex structure, and achieve small steric hindrance, low biotoxicity, and good biocompatibility Effect
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Embodiment 1
[0033] Condensation reaction and lactide synthesis reaction are as follows: 300g L-lactic acid aqueous solution (87wt%) is added in 1L prepolymerization reactor and system temperature is raised to 150 ℃, pressure 50hpa, dehydration 30min, detection water content is less than 1%; Then, Add 0.286g prepared catalyst Ca[N(CH 3 ) 2 ][NHOCH 3 ], the temperature of the reaction system was raised to 170°C, the system pressure was 30hpa, and the reaction was carried out for 60 minutes. The molecular weight distribution of the lactic acid oligomers obtained by the prepolymerization reaction was around 1500, and the distribution coefficient was 1.23-1.31; finally, the prepolymerization reaction solution was taken out and placed in In the depolymerization reactor, the temperature was raised to 180° C., the system pressure was 25 hpa, and the reaction was carried out for 30 minutes to obtain crude lactide with an optical purity of 99.5%. .
[0034] 0.19gCa[N(CH 3 ) 2 ][CH 3 NOCH 3 ]...
Embodiment 2
[0036] Condensation reaction and lactide synthesis reaction are as follows: 300g L-lactic acid aqueous solution (87wt%) is added in 1L prepolymerization reactor and system temperature is raised to 150 ℃, pressure 50hpa, dehydration 30min, detection water content is less than 1%; Then, Add 3.2g prepared catalyst Sn[N(CH 3 ) 2 ][NHOCH 3 ], keep the temperature constant, the system pressure is 50hpa, react for 3h, the molecular weight distribution of the lactic acid oligomers obtained by the prepolymerization reaction is about 1500, and the distribution coefficient is 1.4; finally, the prepolymerization reaction solution is taken out and placed in the depolymerization reactor , the temperature was raised to 170° C., the system pressure was 10 hpa, and the reaction was carried out for 30 minutes to obtain crude lactide with an optical purity of 99.5%.
[0037] 0.35g Sn[N(CH 3 ) 2 ][CH 3 NOCH 3 ] Catalyst, be dissolved in 5mL dichloromethane solvent, then add 34mL toluene sol...
Embodiment 3
[0039] Condensation reaction and lactide synthesis reaction are as follows: 300g L-lactic acid aqueous solution (87wt%) is added in 1L prepolymerization reactor and system temperature is raised to 150 ℃, pressure 50hpa, dehydration 30min, detection water content is less than 1%; Then, Add 1.73g prepared catalyst Mg[N(CH 3 ) 2 ][NHOCH 3 ], the temperature of the reaction system was raised to 160°C, the system pressure was 30hpa, and the reaction was carried out for 0.5h. The molecular weight distribution of the lactic acid oligomers obtained by the prepolymerization reaction was around 1000, and the distribution coefficient was 1.04; finally, the prepolymerization reaction liquid was taken out and placed in a solution In the polymerization reactor, the temperature was raised to 200° C., the system pressure was 10 hpa, and the reaction was carried out for 30 minutes to obtain crude lactide with an optical purity of 99.7%.
[0040] 0.56g Mg[N(CH 3 ) 2 ][CH 3 NOCH 3 ] Cataly...
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