Application of aramid materials for green tires

The development of the tire industry shows a new trend of integrating safety, green, environmental protection and intelligence. In order to adapt to the EU tire labeling law, China has proposed the "Green Tire Technical Regulations", which puts forward corresponding requirements for the structure and material quality of the skeleton materials. . Ultra high strength, extra high strength steel cord and bead wire, single twist nylon 66 cord fabric, higher modulus, lower shrinkage polyester, nylon 66/para-aramid mixed composite cord, aramid skeleton The development and application of materials will be an important direction for the upgrading of skeleton materials. The industry generally believes that.

The goal of China's tire industry is to achieve green tire industrialization at the end of the “Twelfth Five-Year Plan”. That is, 50% of the radial tire production enterprises that reach two 50%:50% or more have reached the green tire standard. In the process of tire greening, the skeleton material should take on the heavy responsibility. Increasing the fuel economy of the tire is mainly to reduce the rolling resistance of the tire, and the rolling resistance has a high correlation with the weight of the tire itself, and reducing the quality of the tire can reduce the fuel consumption of the tire.

The data of the well-known steel cord company Bekaert shows that when the strength of the steel cord in the tire frame is increased from NT (normal strength) to HT (high strength), the tire can be reduced by 2.5 kg, from HT to UT, Reduce the weight by 1.5 kg. When the strength of the steel cord is increased from NT to HT and UT, the rolling resistance of the tire is reduced by 3% to 7%. For tire companies with an annual output of 10 million, every 7% reduction in rolling resistance means saving 1 billion yuan of fuel and 310,000 tons of CO2 emissions.

The application of aramid materials to green tires can reduce the average quality of high-performance car radial tires by 10% and rolling resistance by 12%. Teijin's previous data shows that with Sulfron 3001 aramid, the rolling resistance of the tire can be reduced by 15% to 30%, and the higher the speed level, the more the rolling resistance of the tire is reduced.

According to DuPont's data, the application of Kevlar aramid to make a car radial tire belt can reduce the rolling resistance of the tire by 5% to 7%; for heavy-duty tires, the mass of the carcass can be reduced by 3 to 5 kg, and the fuel saving is increased by 125%. . The Kevlar aramid cord 1500Dtex/2 is used instead of the 2×0.30HT steel cord, the tire quality can be reduced by 6.5% to 7.5%, and the rolling resistance is reduced by 8% to 15%. The use of para-aramid cords on high-speed or over-loaded automotive and aircraft tires reduces the weight of each tire by 3 kg and costs only 10%. Aramid has thus become one of the fastest growing materials in recent years, growing at a double-digit rate every year.

Replace the 2×0.30HT steel cord with Kevlar aramid cord 1500Dtex/2 for the belt belt of 195/60R14 86H and 225/40ZR18 88W passenger car tires, the weight of the tire is reduced by 6.4%~7.5%, and the rolling resistance is reduced. 12.5%. The durability, high speed, decoupling resistance and strength of the test tires far exceed the national standards, and the cost per material of the tires only increased by 35 yuan.

Polyester cord fabrics for semi-steel radial tires (car tires) average about 0.4 kilograms per strip. According to this calculation, the total annual demand for curtain fabric is about 180,000 tons, and the export volume is 40,000 to 50,000 tons. The annual production capacity of polyester cord fabric is 290,000 tons. Some domestic foreign-funded tire companies have no plans to use domestic polyester cord fabrics, and all are imported from abroad.

Nearly 10 companies in China have been exploring industrialization. Two companies have already produced samples that are comparable in performance to DuPont and Japanese Teijin products. However, the production scale of domestic aramid has never exceeded 1,000 tons.