In order to reduce the production cost of small-wheel motorcycle tires, many rubber tire manufacturers use an appropriate amount of recycled rubber powder in the tread rubber. The activated modified rubber powder prepared by chemical modification has high reactivity. It has better blending effect with rubber. It can improve the wear resistance of tread rubber and extend the mileage while meeting the basic performance requirements of motorcycle tread rubber. Xiaobian today shares with you the reference formula of two small-wheel motorcycle tire tread rubber modified modified activated rubber powder. If you need it, you may wish to try it.
Small wheel diameter motorcycle tire tread rubber reference formula 1 mixed with modified activated rubber powder
60 parts of natural rubber, 20 parts of butadiene rubber, 20 parts of styrene-butadiene rubber, 30 parts of activated modified rubber powder, 4 parts of zinc oxide, 2 parts of stearic acid, 1.5 parts of anti-aging agent, 0.8 parts of paraffin, and 55 parts of carbon black. 7 parts of softening oil, 0.7 parts of rubber accelerator, and 1.3 parts of sulfur; total: 202.3 parts.
Small wheel diameter motorcycle tire tread rubber reference formula 2 mixed with modified activated rubber powder
60 parts of natural rubber, 20 parts of butadiene rubber, 20 parts of styrene-butadiene rubber, 30 parts of activated modified rubber powder, 4 parts of zinc oxide, 3 parts of stearic acid, 2 parts of antioxidant, 0.8 parts of paraffin, and 55 parts of carbon black. 8 parts of softening oil, 0.9 parts of rubber accelerator, 1.7 parts of sulfur, 0.1 parts of scorch retarder; total: 205.5 parts.
From the above formula, we can see that the amount of various rubbers in the formulation, the amount of modified activated rubber powder and the amount of reinforcing agent are exactly the same, and the amount of each compounding agent in the vulcanization system, the softening system and the anti-aging system is slightly adjusted. It is because all kinds of compounding agents are inextricably linked in the rubber compound, and the so-called "leaving one hair and moving the whole body".
The amount of sulfur in the vulcanization system of Formulation 2 is increased, so more accelerators and stearic acid are needed to match. Under normal circumstances, when sulfur is used as a vulcanizing agent in motorcycle tread rubber, the accelerator is mainly composed of accelerator CZ and promoter DM, and the accelerator CZ is excellent in scorch resistance; sulfur in tread rubber formula The increase of dosage will affect the safety of scorch. It is necessary to increase the amount of accelerator CZ and add a small amount of scorch retarder to prevent scorch. The increase of the amount of accelerator requires more stearic acid activation, so the amount of stearic acid is also needed. Adjustment.
When natural rubber/butadiene rubber/styrene-butadiene rubber is mixed with modified activated rubber powder to produce small-diameter motorcycle tread rubber, although the increase of sulfur dosage can improve the mechanical properties of the tread rubber, the aging performance of the vulcanized rubber will have some loss. Therefore, it is necessary to cooperate with more fractions of anti-aging agent, wherein anti-aging agent RD has excellent anti-aging effect caused by heat and oxygen; anti-aging agent 4010 is a high-efficiency anti-aging agent, which has excellent resistance to ozone, wind erosion and mechanical stress. Protective performance; therefore, the amount of anti-aging agent 4010 in the motorcycle tread rubber formula can be appropriately increased.
Reasonable use of modified activated rubber powder in the production of natural rubber/butadiene rubber/styrene-butadiene rubber and the production of small-diameter motorcycle tire tread rubber can not only ensure the performance and service life of the tread rubber, but also greatly reduce the production. cost.