1.Concept
Rubber additives refer to a series of fine chemical products added in the process of processing natural rubber or synthetic rubber into rubber products, which are used to give rubber products the performance, guarantee the service life of rubber products and improve the processing performance of rubber materials. Rubber is a very important material in national production, and rubber additives is an important auxiliary material in rubber industry.
2.Role
(1)To improve the processing and application of rubber products.
(2)Improve the quality of rubber products.
(3)Reduce energy consumption and production costs, and can prevent aging degradation, extend the service life.
3.Origin
(1)1839 – the American Goodyear discovered the effect of sulfur on vulcanization of rubber. So far, sulfur is still the main vulcanizing agent for many rubber varieties, but the reaction rate between sulfur and rubber is slow enough to meet the requirements of other products.
(2)1844 – inorganic vulcanization accelerator was discovered. The addition of basic lead carbonate as an inorganic accelerator in Goodyear’s patent ushered in the inorganic accelerator era for half a century. American chemists discovered that the combination of inorganic compounds and sulphur could shorten the curing time. Since then, the rubber industry has entered the era of inorganic vulcanization accelerator, but it also has low efficiency, poor vulcanization performance and other problems.
(3)1908 – organic vulcanizing accelerator was invented, and vulcanizing agent was invented in 1914. After more than 80 years of research, until the 1920s ~ 1930s, with the basic variety of vulcanization accelerator MBT(M) and its sulfonylamide derivatives and p phenylenediamine anti-aging industrialization, rubber additives basically formed a system.
(4)1952 – China’s rubber auxiliaries industry started, taking the lead in the development of anti-aging agents A and D, and accelerant M. Although the annual output was only 38 tons, it ended its dependence on imports.