Rubber scrap

Scrap rubber fuel Scrap tires Scratch hardness... 

Rubber and miscellaneous plastic products Manufacture of fabricated rubber and plastic products Scrap rubber and plastics, lampblack, curing compounds, dyes... 

Abfallerzeugnis, n. waste product. Abf everWertung,/. utilization of waste. Abfall-fett, n. waste fat or grease, -gummi, n. waste rubber, scrap rubber, -gut, n. waste material (to be treated for recovery), -hefe, /. waste yeast, -holz, n. waste wood, abfallig, a. falling off, sloping, etc. (see abfallen) deciduous adverse. 

Alt-gesell, m. foreman, -gold, n. old gold, -grad, m. (Math.) old (or conventional) degree, 340 circle, -gummi, n. old rubber, used rubber, scrap rubber. 

Gummi, n. gum (India) rubber, caoutchouc. (For compounds see also under Kautschuk-.) -abf e, m.pl. scrap rubber, -arabicum, gum arable, -art, /. variety of gum, gum kind of rubber. 

Ambient grinding involves the comminution of scrap rubber, including tires, at ambient temperatures, typically in a toothed-wheel mill, bench grinder, shear mill, or two-roll miU, to give particles... 

There are two approaches to the combining of scrap rubber and plastics. The initial interest was to use the cmmb in minor proportions to toughen the plastics improving impact strength and reduce the overall cost. A more recent interest is to develop a type of thermoplastic elastomer (TPE) wherein the mbber is the major component bonded together by thermoplastics, which can be processed and recovered as thermoplastics. 

Addition of scrap rubber in the form of either ground waste vulcanizates or reclaim in rubber compounds gives economic as well as processing advantages. In addition to lowering the cost of rubber compounds, the use of cross-linked rubber particles has beneficial effects such as faster extrusion rate, reduced die swell, and better molding characteristics. 

Bauman, B.D., High-value engineering materials from scrap rubber. Rubber World, 212, 25, 1995. 

Phinyocheep, P., Axteb, F.H., and Laosee, T., Influence of compatibibzers on mechanical properties, crystallization, and morphology of polypropylene/scrap rubber dust blends, J. Appl. Polym. Sci., 86, 148, 2002. 

Bauman, A.D., High-value engineering materials from scrap rubber. Rubber World, 212, 30, 1995. Bagheri, R., Wilbams, M.A., and Pearson, R.A., Use of surface modified recycled rubber particles for toughening of epoxy polymers, Polym. Eng. Sci., 37, 245, 1997. 

The lowest grade of plantation crepe rubber. It is made from earth scrap (rubber from latex which has fallen on the ground) and any other plantation salvage scrap. It was formerly called Rolled Brown Crepe. 

The simple reaction of polymers with inorganic reagents has historically been a difficult chemical problem and generally such transformations have been far too expensive to practice on a commercial scale. The use of PTC makes this kind of problem vastly simpler, as innovatively demonstrated in an adaptation by Nicholas (Chapter 13), to find low-cost chemistry for converting scrap rubber into a material more nearly resembling the structure of new rubber. 

Scission of Polysulfide Crosslinks in Scrap Rubber Particles. Throughout this study, we used a single lot of scrap rubber peelings having the average composition described in the Experimental Section. We began our studies with Aliquat 336 as the phase transfer catalyst because of its proven effectiveness in simple systems and its commercial availability. When devulcanization is performed in a refluxing benzene/aqueous NaOH mixture, the chemical crosslink density (M... 

A scrap rubber batch is cooked for up to 24 hours and then discharged into a blowdown tank where water is added to facilitate subsequent washing operations. Digester liquor is removed by a series of screen washings. The washed rubber is dewatered by a press and then dried in an oven. Two major sources of wastewater are the digester liquor and the washwater from the screen washings. 

In the Tirecycle process, first developed in 1982, finely ground scrap rubber is treated with a liquid polymer to form a reclaimed rubber product. RRE literature claims superior bonding properties and suggests use in tread rubber and other products including washers, mats, car parts, and tiedowns. The Tirecycle product is claimed to be useful with thermoplastics such as polypropylene, polyethylene, and polystyrene, as well as polyvinyl chloride, polyesters, and urethanes. 

Crack and joint sealants are applied only on cracks and joints. Seal coats include hot asphalt-rubber sprayed on the surface followed by precoated aggregate. Interlayers are the application of seal coats followed by either a standard overlay or an asphaltic-rubber overlay. Asphalt-rubber, when blended with an aggregate hot mix at about 9 to 10 percent by weight, serves as a binder in the thin overlay applied to the road surface. The hot mix binder holds the greatest potential for using large quantities of scrap rubber because of the thickness and quantity of the overlay. 

On February 20,1986, EPA proposed procurement guidelines for scrap rubber usage in asphalt however, they were not made final because many state highway departments believed that not enough research had been completed at that point to justify promotion of this technology nationally through procurement guidelines. 

A biotechnological process was developed by Straube et al. for the devulcanization of scrap rubber by holding the comminuted scrap rubber in a bacterial suspension of chemolithotropic microorganisms with a supply of air until elemental sulfur or sulfuric acid is separated. This seems to be an interesting process, which obtains reclaim rubber and sulfur in a simplified manner. 

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