The rubber powder processed from waste rubber products can be added back into the tyre to reduce the cost of raw materials, improve the mileage of the tyre and achieve the recycling of waste rubber resources. In actual production, there are differences in the variety and amount of rubber powder used in different parts of the tyre, and the amount of different types of rubber powder in the same tyre part is not the same.
Application in tire tread
Adding 5-15 parts of rubber powder with a particle size between 60-120 mesh in the tread of a load tyre can make use of the interfacial characteristics of the rubber powder mixed with the rubber to improve the dynamic fatigue resistance of the blended rubber and reduce the heat generated during the tyre driving process to achieve the purpose of extending the service life of the tyre. After the amount of rubber powder exceeds 15 parts, the tensile strength, constant tensile stress and wear resistance of the tyre tread rubber drop significantly, so the amount of rubber powder needs to be controlled within 15 parts.
In actual production, the mechanical strength requirements of force car tread rubber are not high, the amount of rubber powder used can be increased appropriately to reduce the cost of more.
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Application in tyre sidewall
Tyre sidewall can resolve the impact and influence brought by uneven road surface, the rubber flex resistance, aging resistance requirements are more stringent. Generally, natural rubber is the main material and paraben rubber is used. The reasonable use of rubber powder in tyre sidewall rubber can significantly improve the flex resistance of the sidewall rubber; with the right amount of silica can further improve the physical properties of the tyre sidewall. In actual production, mixed with 10-15 parts of fine rubber powder, with a suitable vulcanization system can prepare a good overall performance of the tyre sidewall rubber.
Application in tyre cushion belt
Vulcanised rubber powder in the tyre cushion belt in a high amount of blending, some tyre manufacturers produce non-motorised rubber tyres or motor vehicle tyres with inner tube cushion belt even 100% use of vulcanised rubber powder.
The rubber powder retains the elasticity of the rubber, and the molecular structure of the base rubber itself still has unsaturated double bonds that are not involved in cross-linking or vulcanisation reactions, and the vulcanisation cross-linking agent can still continue to participate in vulcanisation cross-linking reactions; therefore, the rubber powder can be directly added to the sulphur yellow and accelerator to produce products with higher hardness than the original rubber powder. In practice, activated rubber powder is used more in all parts of the tyre; it is used more in non-motorised rubber tyres.