Grafting modification method for solution-polymerized styrene-butadiene rubber with low gel rate
A technology of solution-polymerized styrene-butadiene rubber and styrene-butadiene rubber, which is applied in the field of graft modification of solution-polymerized styrene-butadiene rubber with low gel ratio, and can solve the problems of increasing gel ratio of SBR and affecting rubber properties, etc.
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Embodiment 1
[0014] In a 2L stainless steel polymerization kettle with a jacket and mechanical stirring, add 1.5L cyclohexane-hexane mixed glue solution of polystyrene butadiene rubber, 11.25g initiator dibenzoyl peroxide BPO and 45g monomer maleic acid anhydride, the concentration of the glue solution is 15gSSBR / 100mL solvent, and high-purity N 2 Gas, mechanical stirring, 180 rpm, 60 ° C for 3 hours.
[0015] After the reaction is completed, the grafted polymer is precipitated with absolute ethanol, and the grafted polymer is first dried in a vacuum oven for 6 hours, and then the grafted polymer is extracted with absolute ethanol for 12 hours. Then the grafted polymer was dried in a drying oven to constant weight. Its grafting rate is 1.57% measured by chemical titration, and the gel rate is 1.82% with the method described above.
Embodiment 2
[0017] In a 2L stainless steel polymerization kettle with a jacket and mechanical stirring, add 1.5L cyclohexane-hexane mixed glue solution of polystyrene butadiene rubber, 14g initiator dibenzoyl peroxide BPO and 56.4g monomer maleic acid anhydride, the concentration of the glue solution is 15gSSBR / 100mL solvent, and high-purity N 2 Gas, mechanical stirring, 180 rpm, 70°C for 2 hours.
[0018] After the reaction is completed, the grafted polymer is precipitated with absolute ethanol, and the grafted polymer is first dried in a vacuum oven for 6 hours, and then the grafted polymer is extracted with absolute ethanol for 12 hours. Then the grafted polymer was dried in a drying oven to constant weight. Its graft rate is 1.87% measured by chemical titration, and the gel rate is 1.15% with the method described above.
Embodiment 3
[0020] In a 2L stainless steel polymerization kettle with a jacket and mechanical stirring, add 1.5L cyclohexane-hexane mixed glue solution of polystyrene butadiene rubber, 7.95g initiator lauryl peroxide and 40g monomer acrylamide, Glue concentration is 15gSSBR / 100mL solvent, high-purity N 2 Gas, mechanical stirring, 180 rpm, 60 ° C for 4 hours.
[0021] After the reaction is completed, the grafted polymer is precipitated with absolute ethanol, and the grafted polymer is first dried in a vacuum oven for 6 hours, and then the grafted polymer is extracted with absolute ethanol for 12 hours. Then the grafted polymer was dried in a drying oven to constant weight. Its graft rate is 1.66% with chemical titration method, and the gel rate with the method described above is 1.34%.
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