Butyl rubber reclaim

Butyl rubber(s), 4 433-458 9 561 14 265. See also Halogenated butyl rubber annual capacity, 4 451t carbon monoxide compatibility with, 5 4t chemical reactions, 4 448 copolymers, 4 444-446 cure systems for, 21 802-803 economic aspects, 4 451, 452t elastomeric vulcanizates, 4 448-450 formulation for reclaiming, 21 475t health and safety factors, 4 452-453 isobutylene polymerization mechanism, 4 434-436... 

Natural and butyl rubber from inner tubes and other applications, which are fiber-free may be reclaimed by the addition of reclaiming oils and other additives and then subjecting the mix to temperatures of 175-205°C and high shear in a Reclaimator. These conditions are sufficiently severe to break the relatively weak bonds of the disulfide cross-links in the feed, effectively devulcanizing the rubber in a period of 1-3 min under these conditions. 

Butex. [Midwest Rubber Reclaiming] Reclaimed rubber from butyl inner tubes used in tire inner liners, inner tubes, butyl tapes and sealants. 

Hydrogenated tallow amide Isopropanolamlne Polyethylene glycol PPG-20 Tris [1-(2-methyl-azlrldlnyl) phosphine oxide] rubber processing chemical synthesis 6-t-Butyl-m-cresol rubber processing, synthetic 1-Decanethiol 1-Hexadecanethiol 1-Hexanethiol 1-Octadecanethiol 1-Tetradecanethiol rubber reclaiming... 

Natural Rubber (Polyisoprene) Reclaimed Rubber Butyl Rubber Polyisobutylene... 

Phenolic epoxy, polyester-isocyanate, polyvinyl acetate, vinyl chloride-acetate copolymer, polyvinyl formal-phenolic, nitrile rubber, nitrile rubber-phenolic, reclaim rubber, neoprene rubber, polyurethane rubber, butyl rubber, melamine-formaldehyde, neoprene-phenolic, and polyvinyl formal-phenolic. 

Types within group Cellulose acetate, cellulose acetate butyrate, cellulose nitrate, polyvinyl acetate, vinyl vinylidene, polyvinyl acetals, polyvinyl alcohol, polyamide, acrylic, phenoxy Cyanoacrylate, polyester, urea formaldehyde, melamine formaldehyde, resorcinol and phenol-resorcinol formaldehyde, epoxy, polyimide, polybenzimidazole, acrylic, acrylate acid diester Natural rubber, reclaimed rubber, butyl, polyisobutylene, nitrile, styrene-butadiene, polyurethane, polysuHide, silic e, ne< nene Epoxy-phenolic, epoxy-polysulfide, epoxy-nylon, nitrilephenolic, neoprene-phenolic, vinyl-phenolic... 

Elastomeric adhesives are natural or synthetic polymers with superior toughness and elongation. Examples of elastomeric adhesives include natural rubber, reclaimed rubber, butyl rubber, polyisobutylene, nitrile rubber, styrene-butadiene-rubber, etc.l Elastomeric adhesives are supplied as solvent solutions, latex cements, pressure sensitive tapes, and single- or multi-component nonvolatile liquid or pastes.[ 1 However, they are usually supplied in liquid form. Most are solvent dispersions or water emulsions. The service temperature is up to 204°C (400°F). They never melt, have excellent flexibility, but low bond strength. The main application of elastomeric adhesives is on unstressed joints on lightweight materials (e.g., joints in flexure). Hence, they are not considered structural adhesives. 

Latex is a stable dispersion of a polymeric material (Table 8.13) in an essentially aqueous medium. An emulsion is a stable dispersion of two or more immiscible liquids held in suspension by small percentages of substances called emulsifiers. In the adhesives industry, the terms latex and emulsion are sometimes used interchangeably. There are three types of latex natural, synthetic, and artificial. Namral latex refers to the material obtained primarily from the rubber tree. Synthetic latexes are aqueous dispersions of polymers obtained by emulsion polymerization. These include polymers of chloroprene, butadiene-styrene, butadiene-acrylonitrile, vinyl acetate, acrylate, methacrylate, vinyl chloride, styrene, and vinylidene chloride. Artificial latexes are made by dispersing solid polymers. These include dispersions of reclaimed rubber, butyl rubber, rosin, rosin derivatives, asphalt, coal tar, and a large number of synthetic resins derived from coal tar and petroleum. ... 

A standard production thermo-mechanical reclaiming machine , designated MRR-031, has been developed by Elast-Tekhologii LLC in Russia [20,21]. This machine is capable of reclaiming rubber from scrap tyres and GRG based on SBR, polyisoprene, EPDM and butyl rubber. The reclaimed rubber has been incorporated back into new rubber compounds at a replacement level of up to 90% of virgin rubber polymer. The physical properties that are reported for various... 

Natural rubber Reclaimed rubber Butyl rubber Polyisobutylene Nitrile rubber... 

Butyl rubbers Neoprene rubbers Nitrile rubbers Reclaim rubbers... 

The properties required of a liner to perform this function include the ability to adhere permanently to the tyre carcass, heat resistance, flexibility and flex crack resistance over the full operating temperature range and a low level of permeability to air and moisture. Regular butyl rubber cannot be used in this application except, in the form of butyl reclaim, as a flexible, highly impermeable filler for other elastomers, because it cannot be made to adhere strongly enough to the tyre carcass. Bromobutyl rubber possesses all the properties, in ample measure, required for premium quality inner liners, but a few parts of natural rubber are normally included in chlorobutyl liner stocks to ensure that they have adequate cured bond strength (see Tables 16 and 17). 

In another study, the ground reclaim rubber was blended with stirene-butadiene rubber and cured under pressure at 160°C. The cured sheets were silica-reinforced by soaking in tetraethyl ortho silicate, then in an aqueous solution of n-butyl amine catalyst, followed by heat treatment at 50°C. The tensile properties of the blends containing conventionally incorporated silica, with no coupling agent, were superior to those containing silica incorporated by the sol-gel reaction [21]. 

Butyl and NR tubes and other fiber-free scrap rubbers are reclaimed by means of the heater or pan process. Brass tube fittings and other metal are removed from the scrap. The scrap is mechanically ground, mixed with reclaiming agents, loaded into pans or devulcanizing boats, and autoclaved at steam pressures of 10-14 atm (1.03-1.40 MPa) for 3-8 h. The reclaim is finally processed much the same way as... 

Table XXXVI illustrates how the incorrect selection of a tire innerhner polymer will lead to more rapid deterioration in tire performance properties. Replacement of chlorobutyl with natural rubber or reclaim butyl will lead to a more rapid loss in tire air pressure and loss in overall tire performance [43].

Reclaim Rubber. Rubber recovered from scrap rubber goods, primarily by digestion or mastication at elevated temperatures, consists of soluble hydrocarbon, crosslinked rubber, and about 30% carbon black, plus minor amounts of oil, tackifiers, and curative residues. The rubber content of reclaim derived from tires is a mixture of SBR and NR, while butyl reclaim is derived from inner tubes. One of the principal virtues of reclaim is price. It is used for black friction tape but to a larger extent for duct tapes and pipe wrap tapes. 

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