China's rubber chemicals industry already has a certain foundation for research and development. In the future, according to market demand, enterprises, research institutes, and universities should cooperate in research to promote industrial technological progress.
1 Accelerate the industrialization and serialization of additives for processing operations
China's processing operation system additives started late and there are not many varieties, and we must increase development efforts. Although the amount of the processing operation system additive is small, the varieties are numerous and complicated, and the technical content is relatively high, which plays an important role in improving the processing technology and improving the production efficiency and product quality of the rubber processing industry.
Homogenizers are used to improve the homogeneity of rubbers of different polarities and viscosities. German S&S., Rhine Chemicals, Inc. and others have series of varieties of products that are marketable. Domestic production has not yet been scaled up. S&S.'s 40MSF series dark aromatic hydrocarbon resin mixture is suitable for rubbers such as NR, SBR, BR, EPDM, and NBR. It can not only improve the mixing uniformity of different polar rubbers, but also promote rapid dispersion of fillers. Its 60NSF light-colored aliphatic hydrocarbon resin mixture is suitable for light-colored rubber compounds. It can be seen that in order to meet the requirement of stronger specificity, it is necessary to produce serialized varieties.
Tackifying resins are particularly suitable for multilayer rubber composite products. Although we have industrialized some varieties in recent years, there are still gaps. For example, the Koresin super tackifier resin from BASF, tert-butyl acetylene resin, can keep the surface tackiness of rubber for several weeks, but it is still needed to be imported. In cord-rubber bonding additives, Cytec Corporation of the United States has a large number of products. In recent years, the single-component, low-cost, non-environmentally-contaminated adhesive resin-protected Cyrez CRA132 series is a novel and novel self-condensing product, even in sub-substances. In the case of the methyl acceptor, the melamine self-shrinking component can also form a cross-linking effect, and the bonding quality is better than HMMM and salted products. This new product development idea is worth our reference.
The processing system additives include dispersants, plasticizers, mold release agents, and anti-scorching agents, all of which are self-contained system-specific additives. Dow Corning's silane release agents and internal spray agents have excellent performance and are favored by domestic users. The silane coupling agent St-75 tetrasulfide recently developed by Nanjing Shuguang Chemical Factory has a low content of tetrasulfide and a part of disulfide, which reduces the tendency to scorch. The Changzhou Shuguang Chemical Factory has successfully developed a pre-dispersed adhesive system with good dispersion effect. Zhenjiang Jinwei Group Co., Ltd. has successfully developed the thio acid composite metal salt RM series products with low prices, which helps users to reduce costs. These products should speed up the pace of industrialization.
2 Anti-aging agents and accelerants continue to reform to develop new varieties
Accelerators and antioxidants are the most used additives, so their technological progress has been a hot topic at home and abroad. Nanjing Chemical Plant will carry out technological changes on paraphenylene diamine anti-aging agents, and use hydrogen reduction technology to produce RT bass, reduce pollution, improve quality, and thus lay a good foundation for the production of high-quality 4020 and 4010NA. Muscle, thiuram, and sulfoxamate accelerators are all synthesized using an oxidative condensation process. Conventional processes require the use of oxidants such as sodium hypochlorite and sodium nitrite. Oxygen catalytic oxidation process, hydrogen peroxide oxidation process, and electrochemical synthesis process have been researched and developed in China, and the amount of three wastes has been greatly reduced, which is in line with the development trend of “clean processesâ€. The oil-filling and granulation technologies for accelerator powders have been adopted in Tianjin, Shandong, and other places, and the pace of technological transformation needs to be accelerated in the future. Different types of accelerator formulations are also sold abroad, and synergistic varieties can be combined to form unique new varieties. This is also the direction of future research and development of new products.
Since German control of the content of N-nitrosilicon in the air in Germany in 1988, manufacturers in various countries have adopted measures to switch to safety accelerators. In recent years, NOBS and other promoters containing linacyl, primary amines, have not been detected in radial tires in the United States and Europe. The base accelerators NS and CZ become the dominant species of accelerators. The production and sales volume of China's NS is increasing year by year, and the production of CZ can fully meet the market demand. In the future, we should continue to promote the expansion of NS consumption. In addition, new safety accelerators are still under development. TBSI is superior to NS, and Nanjing Chemical Plant has conducted research. It is also necessary to develop safety promoters based on two-section cavities as well as other nitrosamine-free toxicity issues.
The characteristics of future additives should be non-toxic, non-environmental pollution, and reasonable cost performance. For example, Unirail's Duravzon 37 series triazine ring terephthalate anti-aging agent, no color pollution, is an ideal antioxidant for dynamic and static rubber products antioxidant and ozone resistance, with slow migration speed, Resistance to extraction, low volatility advantages.