The Properties of Siloxane Rubbers Modified with Organobentonites

Effect of combinations of antimony trioxide with nontoxic flame retardants on the flame resistance and properties of vulcanized rubber based on general-purpose rubbers

“…2, 4, and 6, containing Cloisite 15A, is probably associated with penetration (intercalation) of rubber macromolecules into the interlayer space of the layered silicate constituent of Cloisite 15A. This leads to the formation of a nanocomposite [10] and to decreased diffusion of rubber degradation products (carbon dioxide, water vapor, etc. ), which prevent the access of atmospheric oxygen to the burning rubber and thus decelerate its combustion.…”

“…The problem of replacement of antimony trioxide by nontoxic flame retardants can also be solved by introducing organoclays into rubbers. It has been found [8][9][10] that organoclays based on layered silicates (montmorillonites) enhance the heat resistance of vulcanized rubbers, which, in turn [4], should lead to the enhancement of their fl ame resistance. In this study, we examined the possibility of partial replacement of antimony trioxide by combination of aluminum hydroxide with barium borate, by Cloisite 15A organoclay, and by microquartz in vulcanized rubber based on generalpurpose rubbers (isoprene and butadiene) with sulfur vulcanizing system, used for fabrication of fl ame-resistant molded rubber items for mining industry.…”

Effect of Organoclays on Fire Resistance of Siloxane Rubbers

“…The previous studies have shown high effectiveness of layered silicates -montmorillonites modified with quaternary ammonium salts (organoclays (OCs)) -in siloxane rubbers as a result of intercalation, which manifests itself in improvement of such properties, as resistance to swelling in solvents, increase of the modulus at 100% elongation, hardness, elasticity and thermostability (thermostabilization) [8,9].…”

The Development of a Flame-Retardant Rubber Compound Based on General-Purpose Rubbers

“…Therefore, it is of interest to investigate the possibility of the partial or complete replacement of antimony trioxide in these rubbers with less toxic fireproofing agents. Data on increase in the heat resistance of rubber compounds by introducing organoclays based on layered silicates (montmorillonites) have been given elsewhere [12][13][14]. Kodolov [4,5] showed that increase in the heat resistance of polymeric materials leads to an increase in their flame resistance.…”

“…Thus, the partial replacement of antimony trioxide with Cloisite 15A organoclay in a rubber mix based on general-purpose rubbers with a sulphur vulcanising system leads to an improvement in its rheometric properties and to an increase in the physicomechanical properties, heat resistance, and non-flammability of the vulcanisate. Increase in heat resistance and flame resistance of the rubber compound is achieved through the formation in the rubber compound of a nanocomposite [14] by the penetration (intercalation) of rubber macromolecules into the interlayer space of the layered silicate comprising the base of organoclay Cloisite 15A. This leads to a reduction in diffusion of the breakdown products of the rubber compound (carbon dioxide, water vapour, etc.…”