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P-aramid fibers improve truck tire chunk resistance

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Executive summary

When sulfur vulcanized natural rubber compounds are exposed to a thermal aging environment significant change in physical properties and performance characteristics are observed. These changes are related directly to modifications of the original crosslink structure. Decomposition reactions tend to predominate and thus lead to a reduction in crosslink density and physical properties as observed during extended cure normally encountered in curing truck or off-the-road tires. The process leads to high heat generation and
ultimately affects prime tire properties, such as flex, cut and chip resistance. The tire industry is therefore continually striving to improve cut, chip and chunk resistance while maintaining a high level of product quality and product performance.

Over the years the rubber industry has developed several compounding approaches with varying fillers or optimizing cure packages or altering polymers and blend ratios. Each approach shows improvement with regard to cut, chip and chunk resistance but at the expense of hysteresis, heat buildup and flex properties.
This paper provides an outline of available approaches with an emphasis on new avenues for p-aramid (Twaron and Technora) short fibers to improve cut, chip and chunk resistance. It has been confirmed that the addition of 1-3 phr of p-aramid short fibers in a typical truck or off-the-road tread compound significantly could improve hysteresis and temperature developments, thereby reducing cut, chip and chunk resistance. The tire test data show a significant degree of improvements with regard to the performance—durability (18 20 percent), heat buildup (10 percent) and rolling resistance (10-25 percent).

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Nguồn: Quốc Anh, Cao su Đức Minh

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