Appropriate use of reclaimed tire rubber in automobile tire nylon cord rubber can effectively reduce the cost of raw materials. Appropriate adjustment of the nylon cord rubber formula containing reclaimed rubber can further increase the amount of reclaimed tire rubber and reduce more raw material costs. So in actual production, in the process of preparing nylon cord rubber with natural rubber and styrene butadiene rubber as the main raw materials, how much reclaimed tire rubber is appropriate? How should rubber tire manufacturers adjust the formula?
1. Reference formula of natural rubber/styrene butadiene rubber/tire reclaimed rubber
37 parts of natural rubber, 38 parts of styrene-butadiene rubber, 50 parts of reclaimed tire rubber, 3 parts of zinc oxide, 1 part of stearic acid, 1 part of antioxidant, 35 parts of carbon black, 8 parts of aromatic oil, 0.9 parts of accelerator, 2.3 parts of sulfur Parts, total: 176.2 parts.
2. The difference between styrene butadiene rubber and oil-extended styrene butadiene rubber
When using natural rubber, styrene-butadiene rubber and tire reclaimed rubber to produce car tire cord rubber layer, rubber products manufacturers can choose to use ordinary styrene-butadiene rubber or oil-extended styrene-butadiene rubber according to actual needs. SBR is abrasion-resistant, heat-resistant, and aging-resistant, and its processing performance and use performance are similar to natural rubber, but it generates high heat and large hysteresis loss during use; oil-extended SBR can just overcome the above shortcomings of styrene-butadiene rubber. The flexibility is improved, the plasticity is better, and the cost is lower.
3. How to adjust the nylon cord rubber compounding system containing reclaimed rubber
(1) When using natural rubber, styrene-butadiene rubber and tire reclaimed rubber to produce nylon cord rubber, choosing sulfur vulcanization can improve the physical and mechanical strength of the cord rubber. The accelerator DM is the main and the accelerator D is auxiliary. In the reinforcement filling system, the selection of fast pressing black, such as carbon black N550, can give the rubber a higher stiffness, better processing performance, high temperature resistance and thermal conductivity of the vulcanized rubber, and a significant improvement in reinforcement and elasticity.
(2) If natural rubber, oil-extended styrene-butadiene rubber and tire reclaimed rubber are used in nylon cord rubber, rubber product manufacturers can choose high-fixed-stretch semi-reinforcing furnace black N774, which has good rubber processing performance, high elasticity of vulcanized rubber, and Low heat and good dynamic performance. In actual production, the amount of reclaimed tire rubber in nylon cord rubber formulations generally using oil-extended styrene butadiene rubber 2LLYY98 is less, and the amount of sulfur and accelerator is slightly more than that of ordinary styrene butadiene rubber cord rubber. The amount of carbon black can be appropriately increased.
When using natural rubber/styrene-butadiene rubber/tire reclaimed rubber and using rubber to prepare nylon cord rubber, the amount of reclaimed tire rubber can be appropriately increased or decreased according to actual needs and the matching system can be adjusted at any time; when mixing, all kinds of rubber must be fully masticated Afterwards, mixing is carried out. If oil-extended styrene-butadiene rubber is used in the formula, it should be mixed with a small roller pitch and low temperature, appropriately increase the number of thin passes, etc., appropriately adjust the rubber processing technology, and further optimize the comprehensive indicators of automobile tire nylon ply rubber while reducing costs.
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