A kind of silica dispersant for rubber and preparation method thereof

Abstract

The invention discloses a novel silica dispersant for rubber. The composition of the silica dispersant for rubber is polyethylene glycol fatty acid ester. The white carbon black dispersant of the invention can improve the processing safety performance, physical and mechanical properties and vulcanization speed of rubber compounds. The white carbon black dispersant of the present invention can produce effective effects with white carbon black and rubber, and can be used in the mixing process of natural rubber and synthetic rubber to increase the amount of white carbon black and other white fillers and powder additives in the rubber compound. of dispersion. Containing polyethylene glycol chains, the hydrogen bond between polyethylene glycol and the surface of silica can effectively cover the surface of silica particles, and chemically modify the surface of silica, while polyethylene glycol fatty acid ester chains also contain Two long alkyl chains can be compatible with rubber molecules, making it easier to combine silica and rubber molecules, and facilitate the dispersion of silica during the mixing process.

Description

technical field [0001] The invention relates to a novel white carbon black dispersant for rubber and a preparation method thereof, belonging to the technical field of fine chemicals. Background technique [0002] Silica can significantly improve rubber performance and reduce tire rolling resistance to improve fuel economy. The tire made by adding white carbon black as a reinforcing agent not only has high grip, excellent wear resistance and wet skid resistance, but also has a 30% reduction in rolling resistance compared with ordinary tires, and saves fuel by 7%-9%, which is very good. safe and economical operation. The polysiloxane inside the silica and the active silanol groups on the outer surface and its adsorbed water make it hydrophilic, difficult to wet and disperse in the organic phase, and because of the presence of hydroxyl groups on the surface, the surface energy is large and the aggregation The body always tends to coagulate, so the application performance of t...

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Problems solved by technology

[0004] Adding silane coupling agent, the effect is more significant, but some active groups in silica tend to weaken the effect of silane coupling agent, thus affecting the performance of the compound

Adding alcohol and alcohol amine polar compounds can reduce the interaction between silica and improve the dispersion in the rubber compound, but the compatibility of small molecular compounds with rubber is poor, and there is no binding force with rubber. Limited improvement in the dispersion of black in the compound

The white carbon black dispersants currently sold in the market are mainly mixtures of zinc salts and fatty acid esters. This type of dispersant is only used as a dispersant to physically modify the coating of white carbon black and improve the physical and chemical properties of the vulcanized rubber. not big

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