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Domestic green nitrile rubber for the first large-scale application
May 28 , developed by the China Petroleum and Chemical Research Institute , Lanzhou Petrochemical Company production of environmentally friendly NBR NBR3305E, NBR2907E departure sent to the user , the domestic environment-friendly NBR officially entered the stage of large-scale industrial applications , will exceed the EU REACH and other barriers to international trade restrictions on domestic rubber products exports.
Test results show that these two grades of nitrile rubber excluding environmental endocrine disruptors , carcinogens , Reach to meet regulatory requirements , can be used for the production of rubber and plastic products in contact with humans and animals .
Test results show that these two grades of nitrile rubber excluding environmental endocrine disruptors , carcinogens , Reach to meet regulatory requirements , can be used for the production of rubber and plastic products in contact with humans and animals .
Evidently, the production of nitrile rubber commonly used in emulsion polymerization, in the system containing an emulsifier , dispersant , initiator , activator , antifoaming agents , terminating agents , antioxidants and other additives . Some additives may directly contain endocrine disruptors , carcinogens and other harmful substances or chemical reaction releases of hazardous substances in the production of nitrile rubber latex process due to the removal of residual monomers , plastic material drying thermal decomposition hazardous substances. It not only can not meet the EU REACH regulations and standards, nonylphenol produced during the reaction is also banned the import and export of China's Customs classified material . To this end, the China Petroleum and Chemical Research Institute of Lanzhou Petrochemical Company several years ago began the research on environmental nitrile rubber .
According to the researchers , the current production of products with a nitrile rubber , in addition to the content of nonylphenol , other limited content material can meet export requirements , and therefore is a key factor in whether or nonylphenol standard products can export . NBR harmful to determine the source of the material is the first step in the development of green nitrile rubber . After preliminary tests , screening analysis , China Petroleum and Chemical Petroleum Institute researchers to determine the initial hydrolysis is an antioxidant containing nonylphenol or nonylphenol ethoxylate , terminator nitroso amines produced in the course of matter .
Researchers one investigation the preparation of nitrile rubber additives and dozens of 30 kinds of production processes , locked the non-green material source, and determine the type of environmental nitrile rubber additives for the formation mechanism of screening ; composite environmental termination agents to solve common environmental terminator low efficiency problem , termination of the polymerization efficiency of nearly 8 %, residual monomer removal equipment operating cycle increased by nearly 20 days ;Special environmental additives added polyfunctional compound forming a self- emulsifying system , to solve the difficult environmental antioxidant dispersion , the problem of uneven dispersion ; low temperature emulsion , more additive was added , cascade regulating the molecular weight of the polymer its distribution, supplemented by long-term environmental antioxidants , environmentally friendly products to solve many problems and poor storage stability .
Researchers eventually developed in line with REACH regulations and meet children's products strictly limited environmental nitrile rubber , and the establishment of a complete evaluation system for environmental protection of nitrile rubber . Changing aid system and production process that usually affects the processing performance of the product , the system compares the difference between nitrile rubber grades , the researchers then developed a targeted NBR3305E and NBR2907E two grades of green nitrile rubber processing technology after .
Source: China Chemical Industry News
Source: China Chemical Industry News