Wet smelting method for preparing natural rubber/nanometer silicon dioxide rubber compound

Abstract

The invention discloses a wet smelting method for preparing a natural rubber / nanometer silicon dioxide rubber compound, which comprises the following steps of: mixing natural rubber latex with silicon sol solution to form a wet smelting system; heating the silica sol to generate condensation reaction to generate the SiO2 gel with properties, heating the wet smelting system to generate the silica sol into nanometer silicon dioxide particles in situ and uniformly dispersing the nanometer silicon dioxide particles into NR (Natural Rubber) emulsion to form the NR / nanometer silicon dioxide rubber compound after condensation and co-precipitation; and mixing the natural rubber latex with a nanometer silicon dioxide dispersing body to form the NR / nanometer silicon dioxide rubber compound after condensation and co-precipitation. The wet smelting method has the beneficial effects that the mass ratio of natural rubber / nanometer silicon dioxide prepared by the wet smelting method is 100 / 30-90, and vulcanized rubber of the nanometer silicon dioxide has excellent physical and mechanical properties and is high-quality rubber for preparing truck radial tire tread rubber with high wet skid resistance and low rolling resistance, i.e. green tire.

Description

technical field [0001] The present invention relates to the preparation technology of rubber reinforcing material. Be specifically related to a kind of natural rubber / nanometer silicon dioxide composite material prepared with natural rubber (NR) fresh latex and silica sol or nano silicon dioxide (nano silicon dioxide) dispersion as raw material That is, the wet mixing method of rubber compound. Background technique [0002] Rubber needs to be reinforced with filling and reinforcing agents, and its vulcanized rubber products are of value. Carbon black is the most important reinforcing agent for rubber, with the best reinforcing effect and the largest dosage; followed by white carbon black, but white carbon black is not as good as carbon black in terms of reinforcing effect. In the field of rubber industry, the amount of white carbon black is not as large as that of carbon black. [0003] Carbon black is produced by incomplete combustion of heavy oil or natural gas at high t...

AI Technical Summary

Problems solved by technology

Concentrated natural rubber latex is concentrated from fresh natural rubber latex through centrifugation to remove the latex. When the latex is removed, the latex is lost. Therefore, the production rate of natural rubber latex is 82% to 86%. And consume power labor, cause the production cost of adopting concentrated natural rubber latex to be high

Fresh natural rubber latex contains natural emulsifiers, which are excluded together with the skim during the concentration process, resulting in a low content of natural emulsifiers in the concentrated natural rubber latex, which will coagulate and agglomerate when mixed with the filler slurry; it should be uniform with the filler slurry When mixing to form a stable blend system, an emulsifier must be added, which not only increases the production cost, but also the added emulsifier is often difficult to remove through washing, and finally remains in the vulcanized rubber, which damages the physical and mechanical properties and anti-aging resistance of the vulcanized rubber. performance

Concentrated natural rubber latex also contains a preservation system composed of tetramethylthiuram disulfide (vulcanization accelerator TT), zinc diethyldithiocarbamate (vulcanization accelerator EZ), zinc oxide, lauric acid and other additives. These additives not only increase the production cost of concentrated natural rubber latex, but also damage the stability of natural rubber latex due to natural vulcanization, and obviously damage the physical and mechanical properties of its reinforced vulcanizate due to the pre-crosslinking of NR

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