Butyl reclaimed rubber made from waste butyl inner tubes has excellent air tightness, water tightness, heat resistance and chemical stability. Compared with butyl virgin rubber, butyl reclaimed rubber has better compatibility with natural rubber and butadiene rubber. It can be directly blended into the black sidewall of bias tires with natural rubber and butadiene rubber as the main raw materials. The overall performance of the black sidewall reduces the cost of raw materials. When butyl reclaimed rubber is used in black sidewalls to improve performance and reduce costs, rubber product manufacturers need to appropriately adjust the black sidewall formula.
1. Reference formula of black sidewall rubber for bias tires
①50 parts of natural rubber, 50 parts of butadiene rubber, 15 parts of butyl reclaimed rubber, 4 parts of zinc oxide, 3 parts of stearic acid, 2.5 parts of antioxidants, 1.5 parts of paraffin, 55 parts of carbon black, 7 parts of rubber oil, promoting 0.6 parts of agent and 1.2 parts of sulfur; total: 189.8 parts.
②50 parts of natural rubber, 45 parts of butadiene rubber, 18 parts of butyl reclaimed rubber, 4 parts of zinc oxide, 2 parts of stearic acid, 3 parts of antioxidant, 1 part of microcrystalline wax, 55 parts of carbon black, 4 parts of rubber oil , 0.6 parts of accelerator, 1.2 parts of sulfur; Total: 183.8 parts.
2. Bias tire black sidewall vulcanization system
The use of traditional sulfur vulcanization system is more beneficial to improve the mechanical strength and wear resistance of the black sidewall of bias tires. In actual production, sulfur-vulcanized black sidewall rubber can be used with accelerator NOBS. NOBS belongs to the sulfonamide type 2LLYY810 accelerator, a typical late-acting high-speed accelerator, easy to disperse during vulcanization, slow initial vulcanization but good after-effect, and the vulcanized rubber is not easy to spray or change color. It is an ideal accelerator for preparing tire sidewall Agent.
3. Black sidewall reinforcement system for bias tires
Reinforcing systems can significantly improve the mechanical strength of rubber products, such as tensile strength. Carbon black is the most common reinforcing agent. Carbon black N220 is a high-density medium and super wear-resistant furnace black with high comprehensive performance; carbon black N330 is a typical high wear-resistant furnace black, suitable for tire treads, sidewalls, cords, etc.; carbon black N375 is a new process Furnace black with high structure and high wear resistance is a special carbon black for tires.
When using natural rubber/butadiene rubber/butyl reclaimed rubber to produce black sidewalls of bias tires, you can choose to use carbon black N220 and N330 together to improve the tensile performance, tear resistance and wear resistance of the sidewall rubber And flexibility, etc. Or use carbon black N375 alone to improve the strength, tear, and fatigue resistance of the black sidewall, and improve the physical properties of the sidewall rubber.
4. Bias tire black sidewall anti-aging system
In the black sidewall formula of bias tire mixed with butyl reclaimed rubber, rubber manufacturers can use antioxidant 4010NA, antioxidant D and antioxidant H together. The combination of antioxidant D and antioxidant 4010NA can significantly improve the sidewall rubber The heat resistance, oxygen resistance, ozone resistance, flex crack resistance, etc.; with a small amount of antioxidant H to further improve the sidewall rubber flex resistance, crack resistance and resistance to harmful metal ions.
The black sidewall of bias tires can also be used alone with antioxidant 4020, combined with paraffin wax or microcrystalline wax, to further delay the occurrence of ozone cracking and flex fatigue aging of the sidewall rubber.
In actual production, when preparing black sidewall rubber for bias tires from natural rubber/butadiene rubber/butyl reclaimed rubber, rubber product manufacturers also need to pay attention to the softening system design, and coordinate the vulcanized rubber through the coordination of the reinforcing system and the softening system. The relationship between various indicators, commonly used softening oils are aromatic oil, 30 engine oil and so on. Later editors will continue to discuss with you the points that need attention in the production process of bias tire black sidewall rubber containing butyl reclaimed rubber and various processing techniques.
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