Grafting modification method for solution-polymerized styrene-butadiene rubber with low gel rate

Abstract

The invention relates to a preparation method of polar solution-polymerized styrene-butadiene rubber with low gel rate. The method involves grafting polar monomers on solution-polymerized styrene-butadiene rubber by means of free radical solution method, so as to change the polarity and further improve the interface bonding force of styrene-butadiene rubber and carbon black or white carbon black, so that the wet-skid resistance, wear resistance and dynamic mechanical property of vulcanized rubber are improved and the rolling resistance is reduced. The polar monomers used comprise maleic anhydride, acrylic acid, acrylamide, N-vinyl pyrrolidone and the like. The grafting rate of modified styrene-butadiene rubber is 1-5% and the gel rate is 1-3%; and the rubber polarity changes obviously.

Description

technical field

[0001] The invention relates to a graft modification method of styrene-butadiene rubber, which is applied in the tire industry and provides raw materials for us to develop "green tires". Background technique

[0002] At present, due to the shortage of resources, the destruction of the environment, and the pressure of the economy, there is an urgent need for an environmentally friendly, economical, and safe "green tire". Among many tread rubbers, solution polystyrene-butadiene rubber SSBR has become the research object of major domestic and foreign enterprises because of its excellent wet skid resistance, low rolling resistance, wear resistance, handling and safety. However, as a non-polar rubber, it has poor compatibility with carbon black, especially white carbon black, so that the uniformity and stability of carbon black and white carbon black dispersed therein are low, which is not conducive to improving the rubber properties. Anti-wet properties and redu...

Examples

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%.

technical field

[0001] The invention relates to a graft modification method of styrene-butadiene rubber, which is applied in the tire industry and provides raw materials for us to develop "green tires". Background technique

[0002] At present, due to the shortage of resources, the destruction of the environment, and the pressure of the economy, there is an urgent need for an environmentally friendly, economical, and safe "green tire". Among many tread rubbers, solution polystyrene-butadiene rubber SSBR has become the research object of major domestic and foreign enterprises because of its excellent wet skid resistance, low rolling resistance, wear resistance, handling and safety. However, as a non-polar rubber, it has poor compatibility with carbon black, especially white carbon black, so that the uniformity and stability of carbon black and white carbon black dispersed therein are low, which is not conducive to improving the rubber properties. Anti-wet properties and redu...

Examples

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%.