three major problems in rubber chemicals

China's rubber chemicals in all of the following three questions:

(1) fewer species, the irrational structure. China thiazoles, sub-Sulfonamide, thiuram promoter of the respective categories 2, 4 and 2, respectively, while the developed countries there are ll, 14 and 12; China's second-Amine and quinoline antioxidant category respectively There are 5 and 3, while developed countries were 20 and 9. This shows China's main varieties of rubber chemicals and a far cry from developed countries shows that China's rubber chemicals are not high degree of precision.

1998 World constitute a ratio of promoter: Sulfonamide at 54.8 percent, thiazoles 28.6%, 16.6% thiuram category; and China were 16.3 percent, 39.6 percent and 9.3 percent. World constitute a ratio of antioxidant: Second-Amine 45.5 percent, 21.2 percent quinoline category, naphthylamine 0; and China were 26.3 percent, 26.4 percent and 12.0 percent. We can see that our meeting Sulfonamide promoter and the second-amine antioxidant composition significantly lower than the world average, while the industrialized countries of the sub-Sulfonamide promoter and the second-amine antioxidant Were accounted for and total accelerant of the total antioxidant 60 to 70%, compared gap between our country even greater. Another is that the unreasonable structure of the antioxidant and promoter of production than the reverse. In 1998 the world's developed countries and the promotion of antioxidant agent yields than 1.57, while China's is only 0.6, which is obviously incompatible with the modern requirements of the development of the rubber industry.

(2) backward production technology. The overall level of China's rubber chemicals has been lagging behind, especially in raw materials and intermediate support, compared with developed countries in the world there is a certain gap. The production technology is difficult for the two-amine antioxidant, only a handful of domestic manufacturers for production; production technology and the difficulty of a relatively small but spring up all over the antioxidant, launched blindly. At present, developed countries are used for hydrogenation or reduction of nitrobenzene and aniline condensation of clean technology to the production of antioxidant 4010NA and 4020 on the intermediate Aminodiphenylamine, and the intermittent use of China's major law sodium reduction method for the production of aniline formyl , From impurities in the product content, seriously affected follow-up of the antioxidant product quality, and environmental pollution.

The antioxidant-led foreign products for 4020, due to China's backward production technology, the cost is much higher than foreign products, and poor quality. The promoter foreign products led to NS; In China, raw materials n t-plagued additives industry for many years, although in recent years made some breakthroughs, but the cost of foreign products still have some gaps to be further improved. Most of China's additive manufacturers in thousands of metric tons of annual production capacity around the main agent of foreign manufacturers can achieve the million-ton scale, the domestic rubber chemicals to the formation of large-scale production still a long way to go.

(3) a weak awareness of environmental protection. Foreign countries have stopped using the carcinogenic naphthylamine antioxidant and secondary amine as a promoter of raw materials (such as NOBS and DIBS). China naphthylamine antioxidant still occupies a certain portion of the meeting Sulfonamide leading promoter of the product is still NoBS.

China's rubber chemicals manufacturers generally smaller scale, does not address the "three wastes" of economic strength and technological level of production of the blind, the environment great harm. At present, there is no national laws and regulations introduced, so a large number of toxic products, rubber chemicals are still in use. In order to avoid dust pollution, the developed countries will require all grain products for granulation, and only a few manufacturers in China on a small number of products such as grain processing.