2results about How to "Improve anti-reversion performance" patented technology

The invention discloses 1-(4-aminophenyl)-3-[(4-aminophenyl) carbamoylamino] urea as well as a preparation method and application thereof. The 1-(4-aminophenyl)-3-[(4-aminophenyl) carbamoylamino] urea product is obtained by reacting p-phenylenediamine and diethyl azodicarboxylate under the action of a catalyst. The method is simple in process, milder in reaction condition, easier to control, high in environmental protection property, low in danger coefficient, high in yield and more suitable for industrial application. The product can interact with carbon black to improve the dispersion of carbon black with high specific surface area, can react with carbon-carbon double bonds in natural rubber to form a stable cross-linked network, improves the anti-reversion performance of a rubber material, and has more important social significance and higher economic value.

The invention discloses a long-acting crack-resistant sidewall rubber composition for an off-the-road tire, and relates to the technical field of tires. According to the technical scheme, the rubber composition comprises the following components in parts by weight: 100 parts of a rubber component, 43-53 parts of carbon black, 5-10 parts of processing oil, 2-4 parts of tackifying resin, 1-2 parts of a rubber cracking prevention agent DH-175, 2-4 parts of an anti-reversion agent DC-273, 4-6 parts of an anti-aging agent, 1-2 parts of protective wax, 3-5 parts of zinc oxide, 1-2 parts of stearic acid, 1.3-1.8 parts of sulfur, 1.4-1.8 parts of an accelerant and 0.1-0.2 part of a scorch retarder. The invention overcomes the problem of insufficient flexural aging resistance of the existing tire sidewall rubber material, and provides the long-acting and cracking-resistant sidewall rubber composition for the off-the-road tire, which can be used for a long time in a high-heat and high-ultraviolet scene, so that the flexural aging resistance of the sidewall rubber is greatly improved.