The technology of reclaimed rubber continues to grow, and the quality of reclaimed rubber products is getting better and better. As a result, the application range in the field of rubber products is also becoming wider and wider. The production mode of “natural rubber+synthetic rubber (mostly styrene-butadiene rubber)+carbon black” for automobile tires More and more are replaced by "natural rubber + synthetic rubber + reclaimed rubber + carbon black" to reduce the cost of raw materials under the premise of ensuring the quality of rubber tires. However, in addition to reclaimed rubber, many rubber tire manufacturers often use the right amount of white carbon in tire tread rubber.
In view of the problem of using white carbon in tire tread rubber, different technicians have different opinions. Some people think that white carbon can reduce the rolling resistance of automobile tires, improve the puncture resistance of tire treads, and other indicators. Some people think that car tire treads with white carbon added do not have the same abrasion resistance as tire treads with only carbon black. So shouldn't white carbon black be used in tire tread rubber? Can white carbon be used as a substitute for part of the carbon black in the production of automotive tire treads?
1, the role of carbon black in the car tire tread
In the production mode of "natural rubber + styrene-butadiene rubber + reclaimed rubber + carbon black", the carbon particles in carbon black have strong adsorption, and have good adhesion with rubber molecules, and rubber will be formed after being restrained. Large gel, thereby increasing the hardness, strength and wear resistance of the tire tread rubber, effectively improving the abrasion resistance and wet skid resistance of the rubber tire tread; but due to the action of carbon black and rubber, the agglomerates and friction forces are formed. Large, so the rolling resistance is large, only the nano-grade carbon black can improve this defect, to a certain extent, reduce the rolling resistance of automobile tires.
2. The role of silica in tires of automobile tires
Silica has a smooth surface and a small reaction point. It has a small gel, weak binding force, and low friction. It can reduce the rolling resistance of automobile tires. At the same time, rubber can maintain a good elasticity, and it is easier to adapt to various Different road conditions, with the production of dissolved rubber between the road surface improve the grip of the car tire tread. White carbon itself has superior adhesion, tear resistance, and heat resistance. Substituting part of the carbon black can improve the tear strength of the tire tread compound, increase the adsorption force between the rubber and the skeleton material, and reduce Car tyres generate heat during driving and reduce the occurrence of chipping and chipping; add appropriate amount of white carbon black and silane coupling agent under the production system of “natural rubber+synthetic rubber+reclaimed rubber+carbon black” and use Can further improve the tire tread rubber wear resistance, elasticity and other indicators.
However, due to the excessive use of white carbon, the permanent deformation of the tire tread rubber of the automobile tire will be increased, and the wear resistance will be reduced. Therefore, when replacing part of the carbon black with white carbon, it is necessary to consider the substitution ratio and add the appropriate amount of silane coupling. Agent. Although the addition of silica in the production mode of "natural rubber + synthetic rubber + reclaimed rubber + carbon black" will reduce the wear resistance of automotive tires, but if used properly, it will effectively improve the overall performance of automotive tires and improve automotive rubber. Tire life. "Natural rubber + synthetic rubber + reclaimed rubber + carbon black + white carbon (small amount)" is a good method for producing rubber car tires.