Tire reclaimed rubber is made from waste tire rubber powder and retains the mechanical strength and wear resistance of the original rubber. Bicycle tire tread rubber is in direct contact with the ground, undergoing repeated friction, flexing, and impacts, so it requires certain levels of wear resistance, crack resistance, slip resistance, and puncture resistance. Traditional bicycle tire tread rubber is mainly made from natural rubber and styrene-butadiene rubber, which is relatively expensive as a raw material. Can reclaimed rubber be mixed in?
1. How Tire Reclaimed Rubber is Used in Bicycle Tire Tread Rubber
The main components of tire reclaimed rubber are natural rubber, general-purpose synthetic rubber, and carbon black. It is compatible with natural rubber, styrene-butadiene rubber, and polybutadiene rubber, and can meet the wear resistance (E6LYY126), flex resistance, and puncture resistance requirements of bicycle tire tread rubber. It is much cheaper than virgin rubber, so it can be used in bicycle tread rubber to reduce raw material costs.
Tire reclaimed rubber is generally not used alone to make bicycle tire tread rubber. It is usually blended with natural rubber, polybutadiene rubber, or styrene-butadiene rubber. The mixing ratio of reclaimed rubber is typically 20%-60%. It can also be used with low-density polyethylene to make bicycle tire tread rubber, reducing costs while further improving the overall performance of the tread rubber.
2. Curing Formulations for Bicycle Tire Tread Rubber with Reclaimed Rubber
(1) Natural Rubber/Reclaimed Rubber Blend Curing Formulation
Natural rubber: 50 parts, reclaimed rubber: 50 parts, zinc oxide: 3 parts, stearic acid: 1 part, antioxidant: 1 part, paraffin wax: 0.5 parts, N330 carbon black: 5 parts, superfine active calcium carbonate: 20 parts, light calcium carbonate: 20 parts, accelerator M: 0.5 parts, accelerator TMTD: 0.2 parts, sulfur: 1.8 parts; total: 153 parts.
(2) Natural Rubber/Polybutadiene Rubber/Reclaimed Rubber Blend Curing Formulation
Natural rubber: 40 parts, polybutadiene rubber: 15 parts, reclaimed rubber: 45 parts, zinc oxide: 3 parts, stearic acid: 1.1 parts, paraffin wax: 0.5 parts, antioxidant A: 0.5 parts, antioxidant D: 1 part, antioxidant 4010: 1 part, N220 carbon black: 12 parts, N330 carbon black: 12 parts, gum rosin: 1.6 parts, naphthenic oil: 0.4 parts, accelerator M: 0.35 parts, accelerator DM: 0.35 parts, accelerator D: 0.35 parts, accelerator CZ: 0.25 parts, sulfur: 1.6 parts; total: 136 parts.
(3) Natural Rubber/Styrene-Butadiene Rubber/Reclaimed Rubber Blend Curing Formulation
Natural rubber: 25 parts, styrene-butadiene rubber: 30 parts, reclaimed rubber: 45 parts, zinc oxide: 3 parts, stearic acid: 1 part, antioxidant A: 0.75 parts, antioxidant BLE: 0.75 parts, paraffin wax: 1 part, N330 carbon black: 25 parts, clay: 35 parts, naphthenic oil: 4 parts, accelerator CZ: 1 part, accelerator D: 0.3 parts, sulfur: 1.7 parts; total: 173.5 parts.
When using tire reclaimed rubber to reduce the production cost of bicycle tire tread rubber, it's important to not only choose reclaimed rubber with suitable performance indicators but also to control the blending ratio, design the tread rubber formulation appropriately, and adjust production process parameters properly, especially the mixing and curing processes.
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