The tire belt layer is a rubber material under the base of the tread of radial tires and bias tires, extending the center line of the tread in the circumferential direction to tighten the carcass. It is also called support layer, stabilizer layer, and hard buffer layer. Its main function is Tighten the carcass. Tire belt rubber material is mainly processed from natural rubber or natural rubber/styrene butadiene rubber as the main raw material. The main components of tire reclaimed rubber are natural rubber/synthetic rubber/carbon black, which has good compatibility with natural rubber and styrene butadiene rubber. It can be used in the preparation of tire belt rubber materials, effectively reducing costs.
1. Reference formula for belt rubber containing reclaimed rubber
80 parts of natural rubber, 20 parts of recycled rubber, 48 parts of carbon black, 2.5 parts of cobalt salts, 1.2 parts of resorcinol-80, 0.8 parts of cobalt decanoate, 8 parts of wet zinc oxide, 1 part of antioxidant 4020, 1 part of antioxidant 2 parts of RD, 4 parts of sulfur, 1 part of accelerator NOBS; Total: 168.5 parts.
2. Specific performance requirements of different belt adhesives
The belt layer is a key component of a radial tire, including belt steel cord, shoulder pad rubber, and belt layer pad rubber. There are certain differences in the performance requirements of different rubber materials. In actual production, the belt steel cord rubber requires the rubber to maintain good adhesion in normal temperature, static, high temperature, dynamic and humid aging environments; the shoulder pad rubber should have high elasticity, low heat generation, and tensile strength. The characteristics of high tensile strength, aging resistance, fatigue resistance, etc.; the rubber the belt layers should have high tensile stress, hardness, and good heat resistance, aging resistance, and adhesion.
3. Tips for using reclaimed rubber for tire belt rubber
The belt rubber is selected according to the specific performance requirements of the tire reclaimed rubber that is close to it, and the amount of reclaimed rubber can be increased appropriately to reduce more raw material costs. When using reclaimed rubber 2YLYY512 to reduce the cost of tire belt raw materials, rubber tire manufacturers also need to design a reasonable formula. For example, belt steel cord rubber that requires high rubber adhesion should appropriately increase the compounding agent in the adhesive system. Dosage, in the vulcanization system, it is recommended to select insoluble sulfur in combination with the sulfenamide accelerator with the highest adhesion level.
The quality of reclaimed tire rubber on the market is uneven. When using reclaimed tire rubber to reduce the raw material cost of tire belt rubber, it is recommended to use high-strength reclaimed rubber, tread reclaimed rubber, etc. The product has high mechanical strength, better elasticity and resilience. The usage and dosage of tire reclaimed rubber in different belt rubbers are different. Manufacturers must choose suitable reclaimed rubber products according to actual needs, reasonably control the amount of reclaimed rubber, and appropriately adjust the vulcanization system, reinforcement system, and softening system in the formula. , Anti-aging system and other coordination systems.
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