Tire retreading is one of the ways to recycle waste rubber tires. Refurbished tires are tires that can continue to be used after retreading. Among them, the performance of the retreaded tire tread rubber is directly related to the overall performance of the tire. It is generally processed from natural rubber as the main raw material. The appropriate amount of rubber powder can further reduce the production cost of the tread rubber. So what kind of rubber powder is better to mix in the retreaded tire tread compound, and how much is appropriate? The editor will share with you two compounding formulas of retread tire tread compound mixed with rubber powder today.
1. Natural rubber mixed with modified rubber powder to produce retreaded tire tread compound formula
100 parts of natural rubber, 20 parts of modified rubber powder, 5 parts of zinc oxide, 3 parts of stearic acid, 0.5 part of antioxidant 4010, 1 part of antioxidant D, 1 part of antioxidant DFC-34, 1 part of paraffin wax, carbon black N 330 50 parts, 5 parts of pine tar, 0.6 parts of accelerator CZ, 2.5 parts of sulfur; total: 189.6 parts.
2. Natural rubber mixed with tire rubber powder to produce retread tire tread rubber formula
60 parts of natural rubber, 40 parts of tire rubber powder, 4 parts of zinc oxide, 2.7 parts of stearic acid, 1.1 parts of antioxidant A, 0.9 parts of antioxidant D, 0.6 parts of paraffin, 15 parts of carbon black N 220, 15 parts of carbon black N330 , 3 parts of pine tar, 0.56 parts of accelerator CZ, 2.004 parts of sulfur, total: 144.864 parts.
In actual production, the natural rubber and tire rubber powder are mixed separately and then mixed in proportion.
Natural rubber mixing formula A: 100 parts of natural rubber, 5 parts of zinc oxide, 4.5 parts of stearic acid, 1.5 parts of antioxidant A, 1.5 parts of antioxidant D, 1 part of paraffin, 25 parts of carbon black N220, 25 parts of carbon black N330 , 5 parts of pine tar, 0.7 parts of accelerator CZ, 2.5 parts of sulfur; total: 171.7 parts.
Tire rubber powder mixing formula B: tire rubber powder 100 parts, zinc oxide 2.5 parts, anti-aging agent A 0.5 parts, accelerator CZ 0.35 parts, sulfur 1.26 parts, total: 104.61 parts.
The natural rubber compound A and the rubber powder compound B are mixed in a ratio of 6:4.
When adding rubber powder to the tread rubber of retreaded tires to reduce the cost, both ordinary waste tire rubber powder and activated rubber powder with surface modification treatment can be added. The need for indicators can be determined. In actual production, tire reclaimed rubber can also be used in the retreaded tire tread compound, or the tire reclaimed rubber and rubber powder can be used together, and the formula can be adjusted appropriately to further optimize the performance of the retreaded tire tread compound on the premise of ensuring product quality Reduce more costs.
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