低凝胶含量镍系顺丁橡胶的研究

Study on the low gel content of NiBR rubber

研究了在加氢汽油中以Ni(naph)_2-Al(i-Bu)_3-BF_3·D(以下简称Ni-Al-B·D)为引发体系,进行丁二烯聚合的规律。与Ni(naph)_2-Al(i-Bu)_3-BF_3·OEt_2体系相比,由于采用新型的B·D络合物代替了三氟化硼乙醚络合物,改善了引发体系在溶剂中的溶解性,从而使聚丁二烯橡胶中的凝胶含量由原来的0.36%左右降至0.10%左右。调节B·D络合物用量可合成出不同门尼粘度、凝胶含量低、胶液粘度适宜、性能好的高顺式聚丁二烯橡胶。

The mechanism of polymerization of butadiene initiated by Ni（naph）2-Al（i-Bu）3-BF3·D （Ni-A1-B·D） in the hydrogenation gasoline was studied. Compared with the Ni（naph）2-Al（i-Bu）3-BF3·OEt2 catalyst system,its solubility in hydrogenation gasoline has been improved. The gel content of polymer was decreased from 0.36% to 0.10% for the adaptation of the novel complex B·D instead of BF3v·OE% complex in this polymerization system. By adjusting the dosage of B·D complex, the high content of cis 1,4 structural unit in polybutadiene rubber can also be synthesized,which has different Mooney viscosity,low gel content, fitted viscosity and good processability.