White carbon black is a white inorganic additive with a certain degree of reinforcement. It can replace carbon black to reinforce rubber compounds in the production of rubber products, especially white, light-colored or colored rubber products. The use of white carbon black in the production of off-road tires, engineering tires, radial tires, etc. can improve the overall performance of automobile tires and increase the mileage of tires. So what are the specific functions of silica in rubber tires, and what issues should be paid attention to when using silica in tire production?
1. The role of white carbon black in tires
The addition of white carbon black in tire production can reduce tire rolling resistance, reduce fuel consumption, and significantly improve tire anti-skid performance and safety performance. Studies have shown that the use of white carbon black instead of carbon black can effectively reduce the Paine effect 2YLYY329 of the rubber compound and the loss tangent tanδ at high temperatures, thereby improving the rolling resistance of the tire. The use of all white carbon black tread compound can reduce the rolling resistance by 20% and the hysteresis of the tread by about 50%, thereby saving more than 3% of fuel.
After adding silica to the tire tread rubber formula, the performance of the tire has been significantly improved; especially in terms of the balance of tire wear resistance, wet traction and rolling resistance.
2. Insufficiency of white carbon black used in tires
When silica is used to reinforce rubber tires, due to its small interface area, it has poor affinity with rubber; it is easy to agglomerate, which is not conducive to dispersion in the mixing process; it has the effect of delaying vulcanization during the vulcanization process and is easy to occur with other components reaction. White carbon black is easy to absorb other compounding agents, which is not conducive to dispersion; it is easy to dehydrate to form siloxy groups, which is not conducive to adhesion; the structure hardens and the viscosity increases during storage. Therefore, rubber tire manufacturers should take certain measures to improve the application effect of silica when using silica.
3. Methods to improve the effect of adding silica to tires
In actual production, the use of modifiers can adjust the effect of white carbon black in the tire. The coupling agent is the main one, and the silane coupling agent in the coupling agent is more commonly used. The siloxy group in the silane coupling agent has reactivity with inorganic substances, and the organic functional group has reactivity or compatibility with organic substances. When the silane coupling agent is located between the inorganic and organic interface, a bonding layer of organic matrix-silane coupling agent-inorganic matrix can be formed.
After adding an appropriate amount of silane coupling agent to the tire formula reinforced with white carbon black, the elastomer and the white carbon black molecules can truly form a strong bond, further improve the elongation at break and tear resistance, and obtain Lower hysteresis performance.
In actual production, rubber tire manufacturers can also use highly dispersible silica. Highly dispersible white carbon black can not only better ensure the tire's wet skid resistance and low rolling resistance, but also improve the abrasion and processing performance of the rubber compound. At present, reclaimed rubber is used in many tire production. I have the opportunity to share with you the tips for using white carbon black in tire compounds containing reclaimed rubber.
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