Natural rubber has good elasticity and fatigue resistance, and is a traditional raw material for rubber inner tubes. However, the price of natural rubber is quite high, and the inner tube products produced have defects of poor air tightness and easy aging; Therefore, there are more and more butyl rubber inner tube products on the market. Butyl reclaimed rubber retains the excellent air tightness of butyl rubber, and its compatibility with natural rubber is better than that of butyl original rubber, which can be used in combination with natural rubber to produce vehicle inner tubes, improve the comprehensive performance of natural rubber inner tubes, and reduce costs.
1. The advantages of natural rubber/butyl reclaimed rubber combined to produce inner tube products
In terms of performance, natural rubber has good elasticity and fatigue resistance, and can effectively resist the mechanical stress of the inner tube during use; Butyl reclaimed rubber has good air tightness and good aging resistance, which can ensure the sealing performance of the inner tube and delay the service life of the tire. From the cost point of view, butyl reclaimed rubber is lower than the price of natural rubber, through a reasonable ratio, can reduce production costs on the premise of ensuring performance, improve the economic benefits of enterprises.
2. Natural rubber/butyl reclaimed rubber is used to produce inner tube vulcanization formula
20 parts of natural rubber, 80 parts of butyl reclaimed rubber, 7 parts of zinc oxide, 3 parts of stearic acid, 3 parts of antioxidant, 60 parts of carbon black, 8 parts of paraffin oil, 0.9 parts of accelerator, 1.2 parts of sulfur; Total: 183.1 shares.
3. Natural rubber/butyl reclaimed rubber combined with the production of inner tube formula design points
(1) Vulcanization system: when using natural rubber, butyl reclaimed rubber and rubber as raw materials to produce vehicle inner tubes, sulfur vulcanization is mostly selected, and accelerators M, DM or accelerators NOBS, CZ, etc. are used with sulfur. During the vulcanization process, sulfur can cross-link with rubber molecules to form a stable vulcanization network structure and improve the strength and elasticity of the inner tube.
(2) Activation system: common active agents in rubber formulations include zinc oxide, stearic acid, magnesium oxide, stannous chloride and lead monoxide; The compounding agent of the activated system can play a role in improving the vulcanization speed, crosslinking degree and physical and mechanical properties of the rubber compound.
(3) Reinforcing filling system: reinforcing agent can improve the strength and wear resistance of rubber inner tubes, and the commonly used reinforcing agent in the production of butyl reclaimed rubber inner tubes is carbon black, such as N660/N550/N774, etc.
(4) Softening plasticizing system: softeners and plasticizers can increase the plasticity and fluidity of rubber, improve its processing performance, and make the inner tube easier to operate in the molding process. The commonly used softeners and plasticizers in the production of inner tubes with natural rubber/butyl reclaimed rubber are paraffin oil, naphthenic oil, coumarone resin, rosin, etc.
If you want to further improve the aging resistance of natural rubber/butyl reclaimed rubber and rubber inner tubes, you can also use an appropriate amount of antioxidants. In actual production, when natural rubber/butyl reclaimed rubber is used together to produce inner tubes, the vulcanization formula E4LYY416 requires rubber engineers to reasonably select rubber raw materials according to specific production conditions and application needs, appropriately adjust the formula, strengthen the control of production process parameters and the quality control of finished inner tube products, and produce cost-effective inner tube products with good performance and low cost to meet the needs of the market.
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