Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1976-08-27
1979-08-28
DeBenedictis, Thomas
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 33, 260 35, 260 4R, 260 5, 260 23XA, 260 285AS, 260 285A, 260 285B, 260 285D, 260 291R, 260 324, 260 336AQ, C08L 700, C08L 900, C08L 1100, C08L 1700
Patent
active
041660498
ABSTRACT:
Process of providing a rubberized asphalt from reclaimed rubber produced from whole scrapped tires and having a composition of about 15-20 percent acetone extractible oils, resins, and other rubber compounding ingredients such as antioxidants, antiozants, emulsifiers, and the like, about 10-35 percent carbon black, about 10-20 percent ash primarily from zinc oxide, titanium dioxide, clay, whiting, and talc, and about 35-45 percent rubber hydrocarbon of which 15-30 percent is a mixture of synthetic rubbers such as SBR, neoprene, polybutadiene, isoprene, butyl, and chlorobutyl, and other 10-20 percent is natural rubber and an asphalt at a level of 5-25 percent rubber to 75-95 percent asphalt by weight, the asphalt having a composition of 20-30 percent asphaltenes, 5-15 percent nitrogen bases, 10-20 percent first acidaffins, 30-40 percent second acidaffins, and 10-20 percent paraffins, and the rubber and asphalt being cooked at about 350-450 degrees F. for 30 minutes to 2 hours, which improves the adhesion of the asphalt, reduces stripping, and improves the strength and flexibility of the asphalt; and the product so formed.
Asphalts having less than 30 percent second acidaffins content do not produce the desired adhesive properties when combined with rubber and those that contain more than 40 percent of this component become soft and sticky at summer pavement temperature.
Also a process for producing a rubberized asphalt product suitable for joint and crack sealing, membrance, chip seals, and as a binder for asphaltic concrete, and having a viscosity of less than 800 centipoises at 400.degree. F. and being sprayable using conventional equipment may be provided as may the product itself. It may be provided by cooking at 350.degree.-450.degree. F. for 30 minutes to 2 hours, a composition containing 20-60 percent reclaimed ("devulcanized") rubber, 15-20 percent high rubber scrap, 15-50 percent of a scrap rubber crumb having a somewhat lower rubber content, and an asphalt composed of 20-30 percent asphaltenes, 5-15 percent nitrogen basis, 10-20% first acidaffins, 30-40% second acidaffins, and 10-20 percent paraffins; the rubber-asphalt proportion being 5-25 percent rubber to 75-95 percent asphalt by weight.
REFERENCES:
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patent: 3963659 (1976-06-01), Binder et al.
patent: 4021393 (1977-05-01), McDonald
Glossary of Terms rel. to Rubber and Rubber-like Subs., ASTM Tech. Publication, No. 184.
McDonald, A New Patching Mat'l for Pavement Failures, paper presented at 45th Ann. Meet. Hgwy. Res. Bd., Nat'l Acad. Sci., Wash. D.C.
Proc. Int'l Sym. Use Rubber in Asphalt Pavements, Salt Lake City, Utah, May 10-13, 1971.
Allison, Those Amazing Rubber Roads, Rubber World, Mar. 1967.
Asphalt-Rubber Stress Absorbing Membranes-Morris et al., Arizona Dept. of Transportation.
LaGrone et al., Utilization of Waste Rubber to Improve Highway Performance and Durability, (U.S. Rubber Reclaiming Co., 1973).
Highway Research Record, No. 313, (Hgwy. Res. Bd., Nat'l Res. Council, Nat'l Acad. Sci.-Nat'l Acad. Eng.).
Lewis et al., Prop. of Petr. Asphalts, Publ. Roads, vol. 28, No. 4, Oct. 1954.
Adams Bruce L.
Burns Robert E.
DeBenedictis Thomas
Lobato Emmanuel J.
U.S. Rubber Reclaiming Co., Inc.
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