Method for producing rubber composition, rubber composition and tire produced by employing the same
A method for preparing a rubber composition capable of improving the physical properties of a final product is disclosed. A rubber composition is prepared by dispersing polybutene in rubber in a solution phase (PIB extended rubber). The method comprises dispersing hydrophobic extender oil and polybutene in water to prepare an extender oil/polybutene emulsion; adding the extender emulsion to a latex-shaped rubber composition and uniformly dispersing the same in a solution to prepare a rubber/extension oil/polybutene composition; and solidifying, drying and molding the composition in a latex shape through salting-out and acid precipitation. When the rubber composition is applied to a tire tread composite material, the durability, grip property and low rotational resistance are improved, thereby attaining improved braking characteristic, low fuel consumption characteristic, and wear performance.
1 . A method for preparing a rubber composition in which polybutene is dispersed in rubber in a solution phase (PIB extended rubber), the method comprising:
dispersing hydrophobic extender oil and polybutene in water to prepare an extender oil/polybutene emulsion;
adding the extender oil/polybutene emulsion to a latex-shaped rubber composition and uniformly dispersing the same in a solution to prepare a rubber/extension oil/polybutene composition; and
solidifying, drying and molding the rubber/extender oil/polybutene composition on the latex shape through salting-out and acid precipitation,
wherein the rubber is an emulsion styrene butadiene rubber (ESBR), and the polybutene is added in an amount of 1 wt % to 3 wt % on the basis of the rubber content.
2 . The method of claim 1 , wherein the latex-shaped rubber composition is prepared by performing an emulsion-polymerization reaction of a composition including a monomer, water, an emulsifier, and an additive, and then recovering residual monomers.
3 . The method of claim 1 , wherein the polybutene has a number average molecular weight of 300 to 3,000 g/mol.
4 . The method of claim 1 , wherein the rubber composition is used as a rubber composition for a tire tread, a rubber composition for a shoe sole, a rubber composition for a belt, or a rubber composition for an asphalt additive.