In recent years, the comprehensive utilization industry of waste rubber has developed rapidly, and there has been a qualitative leap in reclaimed rubber technology. In particular, tire reclaimed rubber produced from a large number of waste tires is cost-effective and has a wide range of applications. In the tire reclaimed rubber products, the overall performance of the tread reclaimed rubber is the best. The sole use of rubber products can significantly reduce the cost of raw materials, and can also be combined with natural rubber to improve the processing performance and performance of the products. Some people may ask whether the amount of natural rubber added is better when the tire tread reclaimed rubber is used together with natural rubber. The answer is of course negative. Both the top rubber reclaimed rubber and the natural rubber have their own performance characteristics. The proper use of the two can compensate for the defects of the tread reclaimed rubber. Conversely, improper use of the rubber can limit the performance of the tread reclaimed rubber and affect the performance of the product.
1, tread rubber and the right amount of natural rubber combined advantages
The pure tread reclaimed rubber has good comprehensive performance, and blending with natural rubber further improves the processing performance, mechanical properties and aging performance of the tread reclaimed rubber. The rubber products produced by the combination of the two have better mechanical properties and anti-aging properties. Adding a proper amount of natural rubber to the tread reclaimed rubber will reduce the concentration of carbon black in the tread rubber to reduce the hardness and modulus, shorten the curing time, reduce the processing energy consumption, and improve the processing performance.
In the process of production of recycled rubber, the molecular chains will be destroyed to a certain extent, the entanglement force between the molecular chains will be weakened, and the re-formed cross-linked network will not be perfect. When natural rubber is mixed in, the natural rubber is reinforced. The crystalline rubber is mixed with the bead reclaimed rubber to form a complete network. Therefore, the mechanical properties of the post-mixed rubber are significantly improved.
2, excessive use of natural rubber affect the performance of rubber
After heat aging, with the increase of the amount of natural rubber, the tensile strength retention rate of the rubber gradually decreased, and the elongation rate of tensile elongation also fluctuates. This is because the rubber of the tread reclaimed rubber is regenerated from the tire tread rubber, and the anti-aging agent has been added during the manufacturing process of the tire. At the same time, during the regeneration process, the rubber molecular chain is severely damaged, and the double bonds contained therein are also Rarely, the performance retention rate is high, and its tensile strength is basically not lost after heat aging. When adding natural rubber, the crosslinks of natural rubber in the sulfur vulcanization system are mainly polysulfide bonds, while the macromolecular main chain contains more unsaturated double bonds, which are easily exposed to the atmosphere under the conditions of heat aging. The oxygen attack in the middle, so the double bond is easily broken during aging so that the performance retention rate is reduced.
3, tread rubber and natural rubber mixing the best formula
Considering all aspects of performance, it is recommended that the blend ratio of tread reclaimed rubber and natural rubber be 80:20, and the amount of carbon black N220 should not be too much, about 20 is appropriate, and plasticizer 8 to 12 is the best. Anti-aging agents 4010NA and 264 are ideal for anti-aging, and any anti-aging agent added to the vulcanizate has a tensile strength retention rate and elongation at break elongation of 90% or more.
900-1200 imported Bridgestone, Michelin and other waste tires from the tire top powder processing 80 mesh above the fine ion tire reclaimed rubber products high fineness, small proportion, high strength, good elasticity, the national standard no taste, can Combining natural rubber with high-quality rubber products can significantly reduce the cost of rubber raw materials after being used by thousands of companies. It is the best raw material for high-strength extruded rubber products.
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