Neoprene rubber types, solvent adhesive

In the hot-melt type, two principal polymer types are used polyolefin and ethylene co-polymer based and polyester and polyamide type. In the solvent-based type, the most prominent are neoprene (polychloroprene)-based solvent and latex types, and polyvinyl acetate emulsions. For pressure-sensitive adhesives, the most favored are acrylic adhesives and butyl rubber/polyisobutylene types. 

Phenylene oxide-based resins (Noryl ) epoxy, polyisocyanate, polyvinyl butyral, nitrile rubber, neoprene rubber, polyurethane rubber, polyvinyUdene chloride, and acrylic. Polyethylene-nitrile rubber, polyisobutylene rubber, flexible epoxy, nitrile-phenolic, and water-based (emulsion) adhesives. Polystyrene for these foams (expanded polystyrene (EPS)), aromatic solvent adhesives (e.g., toluol) can cause collapse of the foam cell walls. For this reason, it is advisable to use either 100% solids adhesives or water-based adhesives based on SBR or polyvinyl acetate. Specific adhesives recommended include urea-formaldehyde, epoxy, polyester-isocyanate, polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, and reclaim rubber. Polystyrene foam can be bonded satisfactorily with any of the following general adhesive types ... 

Acetone and methyl ethyl ketone are components of solvent blends in urethane, nitrile rubber, and neoprene industrial adhesives. Acetone is the primary solvent in resin-type adhesives and pressure sensitive chlorinated rubber adhesives. Methyl isobutyl ketone is a solvent component for nitrile rubber and acrylic adhesives as well as in polyvinyl chloride and polyvinyl chloride-polyvinyl acetate copolymer bonding adhesives. Again, the desired evaporation rate of the adhesive formulation will often determine the ketone selected. 

Adhesives used to bond acetal homopolymer (Dehin ) to itself and to other materials, such as aluminum, steel, natural rubber, neoprene rubber, and Buna rubber, include polyester with isocyanate-curing agent, rubber-based adhesives, phenohcs, epoxies, modified epoxies, and vinyls. Solvent cementing cannot be used unless the surfaces are specially roughened, because of the high solvent resistance of this material [23]. Other adhesive types sometimes used are resorcinol, vinyl-phenolic, ethylene vinyl acetate, cyanoacrylates, and polyurethane. 

Adhesives. Contact adhesives are blends of rubber, phenolic resin, and additives supplied in solvent or aqueous dispersion form they are typically applied to both surfaces to be joined (98). Evaporation of the solvent leaves an adhesive film that forms a strong, peel-resistant bond. Contact adhesives are used widely in the furniture and construction industries and also in the automotive and footwear industries. The phenolic resins promote adhesion and act as tackifiers, usually at a concentration of 20-40%. In solvent-based contact adhesives, neoprene is preferred, whereas nitrile is used in specialty applications. The type and grade of phenolic resin selected control tack time, bond strength, and durability. 

A common finishing item for various types of flooring are vinyl and rubber cove base trims. Generally, resin-type adhesives are used for these cove bases, extruded in parallel strips approximately 1 " to 2" apart along the back of cove base. Alternatively, cove base can be installed very efficiently with neoprene contact cements. The cove base is first put into position without any adhesive, and a light pencil mark made along the top edge of the cove onto the wall surface. The neoprene contact cement is then brushed in the space below the pencil mark as well as on the back side of the vinyl or rubber cove base, the solvent is allowed to evaporate, then cove is pressed into position for immediate bond. 

Solvent cements of the neoprene or SBR type are used in automotive interiors to fasten roof linings, sound deadener pads, and rubber weatherstripping to doors or door openings. Hot melts of the polyamide type are used as carpet-to-floor adhesives and to anchor instrument gauge springs. 

Polyurethane epoxy, polyester, polyacrylate, polyhydroxyether, nitrile rubber, butyl rubber, water-based (emulsion), polyurethane rubber, neoprene, SBR, melamine-formaldehyde, and resorcinol-formaldehyde are specific types. Generally, a flexible adhesive should be used for flexible polyurethane foams. Synthetic elastomer adhesives with fast-tack characteristics are available in spray cans. Solvent-based neoprenes are recommended for resistance to stress, water, and weathering. Solvent-based nitriles are recommended for resistance to heat, solvents, and oil. Water-based adhesives... 

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