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Nitrile rubber solvents

Acrylonitrile (AN), C H N, first became an important polymeric building block in the 1940s. Although it had been discovered in 1893 (1), its unique properties were not realized until the development of nitrile mbbers during World War II (see Elastomers, synthetic, nitrile rubber) and the discovery of solvents for the homopolymer with resultant fiber appHcations (see Fibers, acrylic) for textiles and carbon fibers. As a comonomer, acrylonitrile (qv) contributes hardness, rigidity, solvent and light resistance, gas impermeabiUty, and the abiUty to orient. These properties have led to many copolymer apphcation developments since 1950. [Pg.191]

Poly(butadiene- (9-acrylonitrile) [9008-18-3] NBR (64), is another commercially significant random copolymer. This mbber is manufactured by free-radical emulsion polymerization. Important producers include Copolymer Rubber and Chemical (Nysyn), B. F. Goodrich (Hycar), Goodyear (Chemigum), and Uninoyal (Paracdl). The total U.S. production of nitrile mbber (NBR) in 1990 was 95.6 t (65). The most important property of NBR mbber is its oil resistance. It is used in oil well parts, fuels, oil, and solvents (64) (see Elastomers, synthetic— nitrile rubber). [Pg.184]

Nitrile Rubber (NBR). This is the most solvent-resistant of the synthetic elastomers, except for Thiokol, which, however, has rather severe limitations. NBR was developed both in Germany and the United States by private industry prior to World War II. It is a copolymer of butadiene, CH2=CH—CH=CH2, and acrylonitrile, CH2=CHCN, corresponding to the molecular stmcture shown in Table 1. [Pg.469]

Elastomers, syntpietic-nitrile rubber). It is the nitrile group, —C=N, that confers oil resistance to this polymer, and the nitrile content can vary from 10 to 40%, leading to increasing solvent resistance. [Pg.470]

Butyl phenolic resin is a typical tackifier for solvent-borne polychloroprene adhesives. For these adhesives, rosin esters and coumarone-indene resins can also be used. For nitrile rubber adhesives, hydrogenated rosins and coumarone-indene resins can be used. For particular applications of both polychloroprene and nitrile rubber adhesives, chlorinated rubber can be added. Styrene-butadiene rubber adhesives use rosins, coumarone-indene, pinene-based resins and other aromatic resins. [Pg.597]

TPEs from blends of rubber and plastics constitute an important category of TPEs. These can be prepared either by the melt mixing of plastics and rubbers in an internal mixer or by solvent casting from a suitable solvent. The commonly used plastics and rubbers include polypropylene (PP), polyethylene (PE), polystyrene (PS), nylon, ethylene propylene diene monomer rubber (EPDM), natural rubber (NR), butyl rubber, nitrile rubber, etc. TPEs from blends of rubbers and plastics have certain typical advantages over the other TPEs. In this case, the required properties can easily be achieved by the proper selection of rubbers and plastics and by the proper change in their ratios. The overall performance of the resultant TPEs can be improved by changing the phase structure and crystallinity of plastics and also by the proper incorporation of suitable fillers, crosslinkers, and interfacial agents. [Pg.634]

Mathai, A.E., Singh, R.P., and Thomas, S. Transport of Aromatic Solvents through Nitrile Rubber/Epoxidized Natural Rubber Blend Membranes, Polym. Eng. Set 43(3), 704—712, March 2003. [Pg.349]

An organic solvent, used particularly for making nitrile rubber cements. [Pg.39]

Nitrile rubbers have high resistance to oils and organic solvents, and, although their mechanical properties are not as good as those of natural rubber, they are subject to much less deterioration in the presence of oils and solvents. They are not resistant to ozone attack. [Pg.43]

Organic solvents are used to make the rubber dough. Natural rubbers are soluble in rubber solvent (a specific petroleum fraction) or naphtha. Nitrile and polychloroprene compounds require aromatic or chlorinated hydrocarbons as solvents. Often mixtures of solvents are used. [Pg.197]

As the acrylonitrile content in nitrile rubber increases, so does the resistance to nonpolar solvents. [Pg.261]

Although a large number of synthetic elastomers are now available, natural rubber must still be regarded as the standard elastomer because of the excellently balanced combination of desirable qualities. The most important synthetic elastomer is styrene-butadiene rubber (SBR), which is used predominantly for tires when reinforced with carbon black. Nitrile rubber (NR) is a raudom copolymer of acrylonitrile and butadiene and is used when an elastomer is required that is resistant to swelling in organic solvents. [Pg.469]

Block copolymers based on nitrile rubber and on epoxy and phenolic resins and on polystyrene (50-54) have been intensively studied in Russia The generated block copolymers were investigated by turbidimetric and IR methods. Thermomechanical experiments were also run on fractions. As may be seen from Fig 13, fractions which combine the properties of the polymers (Curves 2,3, and 4) were obtained together with fractions characteristic of the raw rubber (Curve 1) and of the resin (Curve 5). The copolymer is soluble in solvents which are typical for both components. Solubility studies on the products showed that for any given ratio of the original components, 15 to 20% of the resin combines with the rubber. The properties of the block copolymer, however, depend on the initial ratio of components nitrile rubber confers elasticity and the phenolic resin processability. [Pg.32]

Neoprene and nitrile rubbers (gum stocks) filled with silica are generally used for insulation of rocket motors and the general process consists of (i) sand blasting of rocket motor followed by cleaning with petrol or organic solvent and drying,... [Pg.315]

Except for the monomers used, the production of NBRs is quite similar to that described for the SBRs. The NBR family is sometimes referred to as the nitrile rubbers. The acrylonilnle-buiadiene ratios cover a wide range from 15 85 to 50.50. NBRs are noted for their solvent resistance, increasing wiih the acrylonitrile content Thus, they are used for gaskets and oil and gasoline hoses, solvent-resistant electrical insulation, and Ibod-wrnpping films. Nitrile lattices also are used in treating fabrics for dry-cleaning durability. Because the NBRs become quite inflexible (stiff) at low temperatures (actually brittle at about -20 C). they arc blended with polyvinyl chloride for some applications. [Pg.541]

Wear nitrile rubber gloves, fireproof clothing, goggles, and face shield. Work from behind body shield where possible. Cover spill with a 1 1 1 mixture by weight of sodium carbonate or calcium carbonate, clay cat litter (bentonite), and sand. Carefully transfer to a pail in the fume hood. Slowly and cautiously add butanol (about 10 mol solvent/mol hydride or about 22 mL per gram) to the hydride until the reaction ceases. Then add water very carefully until last of hydride is destroyed. Let stand until solids settle. Decant liquid into the drain. The solid residue may be disposed of with normal refuse.4... [Pg.501]

Mono, di and triethylene glycols Mixtures of water and dioxane or acetone Nitrile- Flame siloxane ionisation rubber Solvent extract acetylated in presence ofBF4 2mg L1 [224]... [Pg.298]

Acrylonitrile-Butadiene Elastomers. These polymers, the so-called nitrile rubbers , are used dissolved in ketone or other highly polar solvents. When they are compounded with thermosetting phenolic resins it is possible to obtain good resistance to elevated temperatures. [Pg.94]

Nitrile rubber was invented at about the same time as SBR in the German program to find substitutes for natural rubber.56 These rubbers are copolymers of acrylonitrile-butadiene, containing from 15 to 40 percent acrylonitrile. The major applications for this material are in areas requiring oil and solvent resistance. The estimated worldwide consumption in 2003 was 303,000 metric tons.57... [Pg.708]

During the last 15 years several companies have developed hydrogenated grades of nitrile rubber to both improve its thermal stability and solvent resistance. Although the hydrogenation of a poly diene backbone was done as early as the 1920s, real commercial products with acrylonitrile were not introduced until the mid-1980s.59... [Pg.708]


See other pages where Nitrile rubber solvents is mentioned: [Pg.276]    [Pg.2461]    [Pg.589]    [Pg.660]    [Pg.54]    [Pg.558]    [Pg.566]    [Pg.762]    [Pg.44]    [Pg.101]    [Pg.75]    [Pg.142]    [Pg.96]    [Pg.403]    [Pg.405]    [Pg.412]    [Pg.630]    [Pg.636]    [Pg.19]    [Pg.83]    [Pg.262]    [Pg.362]    [Pg.708]    [Pg.69]    [Pg.435]    [Pg.2216]    [Pg.301]    [Pg.435]   
See also in sourсe #XX -- [ Pg.211 ]




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