The development of drug-free rubber chemicals

Production of rubber chemicals
Rubber chemicals rubber industry is an important auxiliary materials. The traditional classification of rubber chemicals can be divided into curing agent, additives and processing aids protection of the three major categories. Rubber chemicals in rubber processing technology to improve energy conservation and improving the quality of products, such as play an important role.
China's rubber chemicals industry after 40 years of development, formed a perfect production, sales and research and development system. In particular the "Eighth Five-Year Plan" and the "Ninth Five-Year Plan" period, with the introduction of the radial tire technology, a large number of joint ventures and wholly owned enterprises and high-performance tire rubber demand, stimulate and promote China's rubber chemicals production and development, The promotion of the production techniques, varieties, production, quality and product mix adjustment and rapid growth. According to incomplete statistics, China's rubber chemicals The total production capacity of about 140,000 tons / year, the total output of the year more than 100,000 tons. Production capacity of more than 1000 tons of rubber chemicals business has more than 80, are located in 18 provinces, municipalities and the formation of a chemical plant in Nanjing, Shandong St. Austrian Chemical Co., Ltd., Shenyang Northeast Auxiliary Plant, Lanzhou Chemical Company plant, Zhejiang Yongjia Chemical Plant, the second chemical plant in Zhenjiang, Dyestuff Factory, Sichuan, Hunan Zhuzhou additives such as represented by factory production base. Since the 1980s, rubber chemicals industry completed the 20 categories of 68 new products in the industrial development of the additive. Rubber chemicals from products in more than 100 expanded to more than 200 species, of which TBSI main varieties are, promoter M, DM, CZ, TBBS, NOBS, D, TMTD, TETD, TMTM, NA-22, ZDC , PX, and so on; the main antioxidant species have antioxidant 4020, 4010NA, 4010, RD, BLE, SP, 264, MB, and so on; processing aid agents have anti-Coke, by sticky resin, curing agent, the agent solution of plastic, resin reinforced , Distributed agent.
The development of non-toxic additive
In recent years, some of the international promotion of rubber processing agents in the course of harmful nitrosamines easy problems have become an increasing priority, research shows, N-nitrosamines by the secondary amine with the reaction of nitrogen oxides produced. In the rubber vulcanization process, to secondary amine (such as morpholine, Diisopropylamine, etc.) based on the promotion of curing agent after the break with the secondary amine in the air or agent with the nitrogen oxides to form N-nitrosamines, Nitrosamine formation of the DNA alkylation, finally induced cancer. The primary and tertiary amines and nitrogen oxides, it will be difficult to generate stable nitrosamines. Many foreign countries have the main types of TBSI that if Mr Sulfonyl Amine, thiuram category, dithiocarbamate sulfur salts to give body and the type of material as possible subjects of nitrosamines, analysis They produce nitrosamines and the alternative mechanism of the problem.
In view of this, many of the world's restrictive laws and regulations were introduced. Germany as early as 1982 on the promulgation of regulations to control content of nitrosamine, the United States, Japan, France and Britain also have not developed a new type of nitrosamines TBSI, one after another and will have to stop using the N-nitrosamines TBSI. 1997 Beijing Rubber Research and Design Institute analysis determined that the tires in Europe and the United States has captured less than Morpholine residue traces, which will have to confirm some of the promoters of the nitrosamines in Europe and the United States is no longer used. Experts point out that environmental protection curing system has become China's rubber accelerator and the key to the future development direction. Here are the promotion of environment-friendly development with the toxic agent TBSI alternative.
Mr Amine sulfonyl time promoter of alternative, including 2 - Morpholine MBT times sulfonamide (NOBS), N, N'-Diisopropyl and thiazole -2 - sulfonamide times (DIBS), and so on, Mainly NOBS.
At present, and other alternative NOBS new promoter in the United States TBSS varieties developed by Monsanto and TBSI. TBSS, TBSI and NOBS structure similar to TBSS and TBSI is the primary amine derivative of the meeting Sulfonamide promoter, does not produce N-nitrosamines. TBSS has become one of the market dominated by foreign agents to promote variety, developed countries accounting for the use of TBSS promoter of the total consumption of 35% to 45%. China's rubber chemicals "Tenth Five-Year" Development Plan made it clear that in 2005 China's TBBS output from the present to less than 1,000 tons / year to the development of 10,000 tons / year or so, when the promoter of the total consumption will account for more than 20%.
Autumn Lamb and the type of dithiocarbamate salts promoter of alternative
Autumn Lamb and the type of dithiocarbamate salt enhancers to promote the effectiveness of a large sulfide, as a second meeting with the promoter Sulfonamide and can shorten the curing time. The study found tetramethyl thiuram disulfide (TMTD) class II thiuram and the Department of methyl dithiocarbamate A zinc (ZDMC) category dithiocarbamate Department of TBSI in the secondary amine will have a N-nitroso-reaction. Diphenyl guanidine, the p-o-guanidine can be used as temporary substitutes, but guanidine accelerator itself is toxic, and the slow pace of sulfide, low-power stretch sulfide set.
At present, the main use of foreign butylated dithio zinc to make up for these shortcomings. In recent years, a new type of foreign security agents to promote the fall Lamb category four benzyl thiuram disulfide (TBZTD) and the four - (2 - ethylhexyl) thiuram disulfide (TOT-N) has come out of goods. As the TBZTD, TOT-N molecular weight, high melting point, difficult to break down, so does not produce nitrosamines, especially TBZTD only slightly lower than the rate of curing TMTD, and other physical properties of almost TMTD, has now become a potential growth area Autumn Lamb category TBSI new varieties.
Given the alternative of sulfur -
At present, commonly used Dithio Morpholine (DTDM) and N-linked oxygen II ethylene carbamoyl S-N '- United oxygen at the Second Asia-methyl-ethyl (OTOS) is based on secondary amine-based To give sulfur-cross-linked system. They are usually used to meet low-sulfur curing system, as given to sulfur-cross-linked system has the advantage back to the characteristics of sulfur and oxygen-resistant and good. Hence the need for alternatives to the characteristics of their choice.
Usually can be used with the primary amine curing agents to promote high-low and promote an effective system of curing agent and the promotion of ZBTP to replace. At present, there are prospects for the development of alternatives is to improve the return of sulfur and fatigue properties of hexamethylene - double - thiosulfate (HTS), or 1,3 - bis (methyl lemon) methicillin-(BCl).
Overall, the promoter of China's rubber industry must adjust the product structure, development and production of environment-friendly TBSI. In the future the focus should be used TBBS, TBSI alternative to the use of the current major Jones Lang times Sulfonyl Amine accelerator NOBS, DIBS, DCBS, and so on; used ZBTP, TBZTD, TOT-N, and other alternative types of toxic thiuram promoter; in order to improve the curing Back to the original fatigue-resistant and can be used to promote HTS agent or BCl and methods; to expand its raw materials TBBS tert-n the size of the device and improve the technology; for TBSI, TBZTD, HTS and BCl research and development as soon as possible to achieve industry Of.