Wear resistance of rubber products

China's rubber industry started from Guangdong brother oak company in 1915, and a tire was born in Shanghai in 1934. After more than 90 years, it has now become a big country in the world's rubber industry. Since 2002, the consumption of raw rubber has ranked first in the world. In 2005, the output of tires in the world was the highest, and the output of non tire rubber products such as hose, tape, rubber shoes, etc. was the highest in the world. In recent years, the annual average increasing rate of rubber consumption in China is about 8%. Rubber consumption is an important indicator to measure the development of rubber industry. In 2008, the rubber consumption in the world was about 22 million tons, and that in China was 5.5 million tons, more than 1 / 4 of the world. In 2008, China's total tire output was 350 million pieces, including 265 million radial tires, with a meridional rate of more than 75%, and tire export volume accounting for about 40%.

The results are as follows: 1. The microstructure of raw rubber in rubber products has great influence on the wear resistance. When there are conjugated double bonds in the molecular chain, the wear resistance of rubber products can be improved. For example, the benzene ring in styrene butadiene rubber contains conjugated double bond groups, which can absorb and distribute external energy, so that the macromolecular chain is not easy to be damaged. Therefore, the elasticity, strength, bending resistance and low temperature resistance of SBR are poor, but the wear resistance is good. Polyamide rubber contains conjugated benzene ring, so its wear resistance ranks first among all kinds of rubber, which is more than 4 times higher than that of natural rubber and styrene butadiene rubber. Compared with natural rubber, the wear resistance of natural rubber below 15 degrees is better, and that of styrene butadiene rubber above 15 degrees is better. If the wear resistance increases, the sliding resistance decreases. Therefore, in the temperature range dominated by elasticity, there is an opposite relationship between wear resistance and skid resistance. With the increase of reclaimed rubber and oil rubber, the wear resistance decreased.

2. Carbon black. Different kinds of carbon black have different effects on the formula performance. For example, HAF has lower abrasion, but if it has nothing to do with heat generation, MPC and ISAF are superior. In order to study the abrasion resistance of rubber compound, the relationship between raw rubber and carbon black should also be studied.

3. Antioxidant and environmental conditions. The wear resistance of antioxidant aw is better than that of antioxidant D + 4010. Reactive antioxidant 4-nitrosodiphenylamine (NPDA) can provide natural rubber with lower heat build-up and significantly improve wear resistance. For the compound with high tensile strength and heat resistance, but also need a comprehensive balance of wear resistance and skid resistance, using chlorinated butyl rubber to add 55-65 phr super wear furnace black has good wear resistance. However, the hardness of chlorinated butyl rubber products decreases slightly, which is the result of thermal decomposition and vulcanization.

4. Methods to improve rubber abrasion.

a. Surface treatment. The chemical treatment with liquid or gaseous antimony pentafluoride can improve the wear resistance by 7-9 times. In order to prevent the decrease of strength and elongation during treatment, gas phase treatment should be adopted to ensure that fluorine compounds are not immersed in the inner layer of the compound.

C. Use new rubber. Such as 1.5-trans-pentene rubber. This kind of rubber has excellent wear resistance, high raw rubber strength and low heat generation. It is similar to natural rubber as tread rubber.