Method for in-situ preparation of silicone rubber composite material

Abstract

The invention relates to a method for in-situ preparation of a silicone rubber composite material. The method comprises the steps of: adding water, an emulsifier, a monovinylarene monomer and a molecular weight regulator into a reaction vessel in order, and under the protection of N2, adding a carbon-carbon unsaturated bond-containing organosilicon monomer and a conjugated diene; initiating a polymerizing kettle for stirring, adjusting the temperature of a reaction system inside the polymerizing kettle to a polymerization reaction temperature, then adding an initiator and starting reaction, keeping a polymerization temperature at 5-30 DEG C, controlling a polymerization reaction time at 7-12h, and when a total monomer conversion rate reaches 60-70%, adding a terminator to terminate the polymerization reaction; subjecting latex to degassing, agglomeration and drying. In terms of 100% of monomer total mass, the conjugated diene accounts for 10-70%, the monovinylarene accounts for 10-45%, and the carbon-carbon unsaturated organosilicon monomer accounts for 2-45%.

Description

technical field [0001] The invention belongs to the technical field of macromolecule chemical synthesis, and relates to a method for preparing silicone rubber composite materials, in particular to an emulsion polymerization method for preparing silicone rubber composite materials in situ. Background technique [0002] The in-situ polymerization method refers to the method of directly adding unsaturated organosilicon compounds to the monomers for rubber preparation in the polymerized state, and strengthening the modified rubber through in-situ hybridization. This method can disperse the silicon-containing dispersed phase in the rubber matrix in nanometer size through chemical bonds, thereby improving the tearing performance of the product, reducing heat generation, and improving the adhesive performance of the rubber compound and other parts in the composite product. Since silicon-modified rubber exhibits good low rolling resistance and wet skid resistance in tire application...

AI Technical Summary

Problems solved by technology

This technology uses a large amount of organic solvents, which is likely to cause environmental pollution and increased costs. In addition, from the perspective of fuel economy, the conjugated diene polymer obtained by this technology cannot meet the needs of practical applications.

[0009] Since organosilanes are easily hydrolyzed in the water phase, which leads to the instability of polymer emulsion products, there are few relevant research reports at present. This patent adopts a low-temperature in-situ emulsion polymerization method to prepare silicone rubber compound composite materials.

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