Halogenated elastomer compounds

The temperature at which the magnesium oxide is calcined is important for its performance in rubber. The calcined MgO product must have sufficient activity to be an effective acid acceptor for use in halogenated elastomer compounds. The light burned grades that are calcined between 700 and 1000 °C usually work well for rubber applications. 

The vast majority of rubber compounds use zinc oxide as an activator. In the case of rubber compounds based on halogenated elastomers such as polychloroprene, the zinc oxide functions as the vulcanizing agent itself and is even more critical. 

There has been Kttle research on the halogen atom-containing elastomer compounds because the volume of consumption of those materials is relatively small. Halogenated butyl rubber compounds generally involve the following components ... 

K. J. Kim et al. [54, 55] showed effects of various processing additives in halogen atom-containing elastomer compounds including polychloroprene elastomer (CR) and fluoro-... 

K. J. Kim, J. VanderKooi, J. Wasko, and M. Hensel, Halogen Atom Containing Elastomer Compound Processing with Processing Additives , Automotive Elastomer Conference 2004 (AES-2004) (paper no. 18) Dearborn, Ml, June (2004)... 

Flame and Smoke Retardants. Molybdenum compounds are used extensively as flame retardants (qv) (93,94) in the formulation of halogenated polymers such as PVC, polyolefins, and other plastics elastomers and fabrics. An incentive for the use of molybdenum oxide and other molybdenum smoke and flame retardants is the elimination of the use of arsenic trioxide. Although hydrated inorganics are often used as flame retardants, and thought to work by releasing water of crystallization, anhydrous molybdenum oxides are effective. Presumably the molybdenum oxides rapidly form... 

The most prevalent approach to achieve long-lasting and nonstaining ozone protection of rubber compounds is to use an inherently ozone-resistant, saturated backbone polymer in blends with a diene rubber. The ozone-resistant polymer must be used in sufficient concentration (minimum 25 phr) and must also be sufficiently dispersed to form domains that effectively block the continuous propagation of an ozone-initiated crack through the diene rubber phase within the compound. Elastomers such as ethylene-propylene-diene terpolymers, halogenated butyl mbbers, or brominated isobutylene-co-para-methylstyrene elastomers have been proposed in combination with NR and/or butadiene rubber. 

Elastomers The zinc borate is an effective synergist of halogen sources and smoke suppressants in elastomers such as styrene butadiene rubber (conveyor belting, flooring), neoprene (wire and cable, dampening compound, conveyor belt), EPDM and PVC-nitrile foam (insulation foam), and so on.55 It has also been used in halogen-free silicone elastomer and EPDM, EP (in conjunction with ATH or MDH). 

Chen, T., Hendrix, A., Glogovski, T., and Butala, R., The characteristics of a non-halogen flame retardant compound using advanced thermoplastic elastomer, in Proceedings of the 51st IWCS/Focus International Wire Cable Symposium, Lake Buena Vista, FL, 2002, pp. 589-593. 

BUNA N (nitrile) Aromatic hydrocarbons, dilute acids and bases, silicones, helium hydrogen Halogen compounds, halogenated hydrocarbons (carbon tetrachloride, trichlorethylene), ketones (acetone), nitro compounds, or strong acids Typical color black. Temperature range -50 to 120°C. Easily compressed. Density 1.00. Lowest permeability rates for gases of all elastomers. 0.25... 

In contrast to this, very little is known about the ozonolysis of olefins which bear halogen substituents at the double bond. This is somewhat surprising since compounds containing vinyl halide moieties are important technical products whose properties could be adversely affected by ozone degradation. A case in point is neoprene rubber, whose performance as an elastomer could suffer considerably by ozone attack and concurrent crack formation (1). 

In addition to plasties, elastomers, lubricants, and fuels, the above mentioned inhibitors are applied as protective agents in halogenation reforming proces.ses" as well as in prevention of the polymerization of monomers and unsaturated compounds during storage. 

In the case of flame retardant silicone elastomer, many ingredients such as silica, platinum, and other flame retardant agents are incorporated into the base siloxane polymer. But there is no need to use the halogenated flame retardant agent, for example, bromine or chlorine compounds. This difference is an advantage of silicones compared with other synthetic polymers in terms of health and safety. 

Elastomers. Many applications of rubbers such as tires, gaskets, and washers normally do not require flame resistance. When improvement in flammability is required, it can be achieved by the addition of halogen-containing materials, phosphorus compounds, oxides of antimony, and combinations of these materials. Rubbers containing chlorine and silicon atoms, for example. Neoprene and Silicone, have self-extinguishing properties. Rogers and Fruzzetti (10) described the flame retardance of elastomers. 

Elastomer Halogenating agent Halogen content (average value) Scattering by halogen compounds, mass % Mooney viscosity at 125 =C... 

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