Wide-distribution polybutadiene-isoprene rubber and preparation method thereof
A technology of isoprene rubber and polybutadiene, which is applied in tire parts, transportation and packaging, special tires, etc., can solve the problems of poor processing performance, easy aging of the matrix, and poor processing performance of raw rubber, etc., and achieve improvement Effects of weight average molecular mass, widening molecular mass distribution and distribution fractions, increasing melt elasticity
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Embodiment 1
[0063] Add 7000mL of n-hexane and 1.0mL of 1.5-diazobicyclo[4,3,0]-5-nonene (DBN) into a 10-liter polymerization kettle under nitrogen protection, and then add it to the polymerization kettle under nitrogen pressure. 1060g of butadiene and 300g of isoprene, start stirring, then raise the temperature of the polymerization solution to 75°C, nitrogen protection pressure 0.35Mpa, then add 0.72mol / L NBL 13.5mL, then drop 9.5 One mmol of DVB dilute solution in hexane is added dropwise for 45 minutes. At this time, the temperature of the glue solution rises to the highest temperature of 95.6°C after 45 minutes of polymerization reaction, and the temperature rise rate is 0.46°C / min. Then continue to stir and react for 20 minutes, then add 13 mL of 0.7 mol / L N,N’-dimethylimidazolinone to the polymerization kettle, and react at a temperature not higher than 90°C for 15-20 minutes.
[0064] Then, the polymer glue was removed from the polymerization kettle, and 3.5g of antioxidant 1076 wa...
Embodiment 2
[0067] Keep the relevant process conditions in Example 1 unchanged, only 0.9mL of DBN is added, the mixed monomer used in the first stage is composed of 1100g of butadiene and 350g of isoprene, and the added butyllithium is 12mL 10.8mmol of divinylbenzene for continuous dropping, and the continuous dropping time is 50min; 12mL of N,N'-dimethylimidazolidinone for lithium termination of the second active chain.
[0068] The results are measured: the number average molecular weight Mn=16.78×10 of raw rubber4 , the molecular weight distribution index is 2.74; the 1,2-addition unit content in the polybutadiene unit in the raw rubber is 8.43%, and the trans 1,4-addition unit content is 78.56%; the polyisoprene unit in the The 3,4-addition unit content is 6.42%, and the trans 1,4-addition unit content is 81.86%. The Mooney viscosity ML of the raw rubber is 58.5; the Tg is -84.6°C.
Embodiment 3
[0070] Keep the relevant process conditions in Example 2 unchanged, only 1.2mL of DBU is added, the mixed monomer used in the first stage is composed of 900g of butadiene and 500g of isoprene, and the added butyllithium is 10mL 11.8 mmol of divinylbenzene for continuous dropwise addition, and the continuous dropwise addition time is 48 minutes. 10mL of N,N'-dimethylimidazolidinone used for the lithium termination of the second active chain was reacted at 85-90°C for 20min, and then 0.7mol / L of tributyltin chloride was added to the polymerization kettle. After reacting 9mL of hexane solution at 80-85°C for 20min, it is ready.
[0071] The results are measured: the number average molecular weight Mn=19.24×10 of raw rubber 4 , molecular weight distribution index 2.86; 1,2-addition unit content in polybutadiene unit in raw rubber is 7.46%, trans 1,4-addition unit content is 78.94%; polyisoprene unit 3 , The content of 4-addition units is 6.23%, and the content of trans-1,4-addit...
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