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Rubber Products Development Trend

The type and grade of raw materials of rubber products will affect the content of heavy metals. Therefore, care should be taken to avoid or reduce the use of raw materials containing chromium and nickel (such as zinc chrome yellow containing six chromium, antioxidant NBC containing nickel). Rubber Products The chrome layer of the mould and skeleton will also bring the chromium element to the compound, so we should develop a new chrome plating technology with trivalent chromium instead of hexavalent chromium. Rubber footwear industry to pay attention to textile and leather dyes limit the heavy metals, limit the use of copper, chromium, nickel metal complex dyes, Rubber Products to avoid China's shoes at the end of 2005 because of the detection of high levels of nickel and azo dyes and Italy was "toxic" investigation puzzle.

The content of heavy metals in rubber products is not only derived from one or two key raw materials, Rubber Products but is the sum of heavy metal content of all raw materials (including rubber). Some raw materials, although heavy metal content is very micro (such as white carbon Black and kaolin), Rubber Products but also pay attention to "add up."

A system composed of vulcanizing agent Tcy (2, 4, 6-three thiol) and ca/mg acid-absorbing stabilizer, and a curing agent XL-21 (2, 3)-Two thiol carbamate methyl quinoline)/CA (OH) 2 acid-absorbing agent system, is the lead-free vulcanization system of chlorine ether rubber, Rubber Products has replaced the na-22/pb304 or "two salts" of the lead sulfide system in the automotive fuel hose application. In addition, there are serious environmental problems in the vulcanization system of sulfonated polyethylene Rubber (CSM), which can be replaced by a lead-free vulcanization system (such as pentaerythritol) or in the production of CSM with chlorinated polyethylene rubber (CM).

The rubber processing oil includes aromatic oil, paraffin oil and naphthenic oil. Aromatic hydrocarbons, which contain a large amount of PAHs, are not used for environmentally friendly rubber products, Rubber Products which also limits the application of oil-filled rubber (such as SBRl712, etc.) for aromatic hydrocarbon oil. Although we have developed a lower PAHs content of oil-filled rubber (such as SBRl723), but the types and quantities of PAHs they contain are not reported, can meet the EU environmental requirements are not known. Rubber Products Paraffin oil and naphthenic oil, because of the origin and processing technology, its PAHs content is also very different. So far, the author has not seen domestic and foreign production of rubber processing oil enterprises produced PAHs data, it is difficult to make a variety of oil environmental evaluation.

Increasingly stringent vehicle emission standards, Rubber Products forcing car manufacturers to take further measures to improve fuel burning rate, the engine hood temperature and exhaust emissions temperature increasing, requiring rubber products at higher temperatures to work, to improve the heat resistance of the rubber is a very important task. For this reason, many seals adopt high temperature resistant fluorine rubber; the rubber material used in the automobile radiator rubber tube is shifted from the present sulphur-yellow vulcanization EPDM 125 ℃ grade to peroxide sulfuration 150 ℃ grade, and further adopts silicone rubber or AEM (175℃ grade). The use of hnbr/aramid cord in the automobile synchronous belt is the trend of development. Rubber Products Rubber products also contribute to the protection of the ozone layer. Currently refrigerant Freon will be replaced by a new refrigerant $literal (ethane), Rubber Products so rubber materials for the production of air-conditioning hoses and seals need to be improved: for the air-conditioning hose, the current preferred $literal through the low rate of polyamide for the inner layer (can also be used CIIR or BIIR), polyamide as the interlayer, the outer layer of rubber for heat-resistant, Rubber Products ozone-resistant EPDM, CR, EVM or HNBR; for the new air-conditioning system seals, the use of HNBR is preferred.