Non-toxic rubber fertilizer become mainstream

In recent years, international pay more attention to the problem on some promoting agents in the rubber processing process is easy produce harmful of nitrosamines the relevant and the generation, nitrocompounds effect subject research become a global rubber accelerator hot topic in the field.

Research shows that, N-nitrosamines is by looking amine and nitrogen oxides reaction and generated. In the sulfurization to process still amine (such as Lin? And diisopropylamine recovered, etc) as the foundation of sulfide accelerator decomposition produce secondary amine and air or nitrogen oxides chelating agent reacts N-nitrosamines, generated nitrosamines will DNA alkylation, there is the possibility of eventually cause cancer. And "amine or tertiary amine and nitrogen oxides, and it will be difficult to generate stable nitrosamines. Many foreign countries have major sulfide accelerator types, while still amine acylation shore-nets class, autumn lamb kind, two for dithiocarbamic acid ligand salts and sulfur give body class of the material as possible the research object of nitrosamines, analyzes their produce of nitrosamines mechanism and substitution problem.

In view of this, the global many restrictive regulations have issued. Such as Germany as early as in 1982 enacted laws control nitrosamines content, the United States, Japan, France, Britain also positive development does not produce new type of nitrosamines sulfide accelerator, and have stopped using will produce of nitrosamines sulfide accelerator. 1997 Beijing rubber research institutes were analyzed, Europe and the United States tyre has capture the traces of the nature of a quantity, it is confirmed that some will produce of nitrosamines promoting agents in European and American countries is no longer used.

21 century is the era of green chemistry, environmental protection in the future of chemical production more important, China rubber fertilizer industry "15" put forward development planning, the future work is focused on the adjustment of product structure, strengthen the development of green nontoxic rubber additives and use.

        In addition, from the world rubber fertilizer industry development situation, it's now at a more mature period, less new varieties and new technologies. With China's accession to the WTO trade barriers to eliminate, the advantages of foreign enterprise in order to keep taking the rubber additives international market, will set up new barriers, environmental protection barriers would be their first target. Therefore, China should conform to the trend, vigorously develop environmental application sulfide accelerator, can say to establish the system of sulfide environmental protection has become China's rubber accelerator future development direction and key. Introduce the development and environmental protection accelerator toxic sulfide accelerator alternative.

Time still amine kind of promote acylation sulfonylurea agent of alternative still amine sulfide accelerator has 2-it nature of the benzene and Margaret sulfonylurea times (NOBS), N amide, N 'the two isopropyl and Margaret-2-time (DIBS) was sulfonylurea, mainly is the NOBS.
At present the alternative NOBS new accelerator is the development of monsanto varieties TBSS and TBSI. TBSS, TBSI and NOBS structure similar, and TBSS and TBSI is "amine derived times of sulfonylurea amide promoter, won't produce N-nitrosamines. TBSS has become the foreign market leading promote agent varieties, and the developed countries in the use of TBSS accounts for promoting agents total consumption of 35% ~ 45%. China rubber fertilizer five-year development plan explicitly pointed out that, in 2005, TBBS production by now to less than 1000 tons/year development to 10000 tons/year or so, when promoting agents will account for 20% of total consumption of above.

Thiuram and dithiocar-bamate accelerator alternative

Thiuram and dithiocar-bamate accelerator have big Vulcanization efficacy.As the second accelerator used with sulfenamide can shorten vulcanizing time.Study found that two sulfur four methyl autumn lamb (TMTD) kind of autumn lamb system and two methyl 2 for dithiocarbamic acid ligand zinc (ZDMC) class of the content and the amino is sulfide accelerator, in still amine will produce N-and the nitro the reaction. Two benzene, toluene pill two adjacent pill can be used as a temporary replacement, but because the pill to promote itself also has such agent toxic, and curing speed is slow, vulcanization set out power is low.

At present the two major foreign two butadiene content and zinc phosphate to make up for these defects. In recent years the foreign new safety of autumn lamb promoter four components simply disulfide autumn lamb (TBZTD) and the four-(2-ethyl already base) disulfide autumn lamb (TOT-N) for commodity market. Because TBZTD, TOT-N molecular weight, high melting point, difficult to break down, so won't produce nitrosamines, especially TBZTD only slightly lower than TMTD sulfide speed, and other physical properties and TMTD almost the same, has become the most potential autumn lamb kind of sulfide accelerator new varieties.

The alternative to body sulfur of currently used the content and nature of the two? (DTDM) and N-oxygen league two and ethyl sulfur generation amino formex-N 'the two and ethyl time oxygen league sulfonylurea (OTOS) is still was the basis of sulphur amine to body crosslinking system. They are usually used for sulfur amount of sulfide with less half system, because the sulfur give body crosslinking system is the advantage of sulfur resistance properties and return of oxygen. So must be in view of its characteristic to alternative choice.

Usually can use contain "amine sulfide accelerator namely high and low sulfur half an effective system and promoting agents ZBTP sulfide to replace. There are the prospects of development is to substitute can improve the fatigue properties of sulfur and six methylene-double-sulfur generation (HTS) sulphate or 1, 3-double (lemon methyl) armour oxygen benzene (BCl).

China rubber accelerator industry must be to adjust the structure of products, the development and production of environmental protection sulfide accelerator. The future work point should be used TBBS, TBSI alternative at present mainly use times of sulfonylurea usions still amine promoter NOBS, DIBS, DCBS, etc.; The ZBTP, TBZTD, TOT-N alternatives such as toxic autumn lamb kind of promoting agents; In order to improve the original and fatigue resistance to sulfide sex, can use HTS promoting agents or and BCl and methods; To expand and raw materials TBBS butyl amine device's scale, perfect technology; For TBSI, TBZTD, HTS and BCl research and development, realize the industrialization as soon as possible.