Railways: surface track – Ties – Nonmetallic
Patent
1997-04-21
1998-09-01
Morano, S. Joseph
Railways: surface track
Ties
Nonmetallic
E01B 344
Patent
active
057998701
ABSTRACT:
A composite railroad tie is provided comprising a phosphogypsum filler and a thermoplastic resin. The composite exhibits desirable physical properties for railroad ties. Suitable sources for phospho-gypsum include fertilizer processes involving (a) providing phosphate rock, (b) contacting the phosphate rock with sulphuric acid in the presence of water to produce phosphoric acid and a calcium sulphate, (c) separating at least a portion of the phosphoric acid from the calcium sulphate to produce a phosphoric acid product and a calcium sulphate byproduct, (d) drying the calcium sulphate byproduct to remove water therefrom. The calcium sulphate byproduct (phospho-gypsum) is then admixed with a thermoplastic and a functionalized compound to produce a filled thermoplastic composition. The filled thermoplastic composition is then melt processed (for example injection or compression molded) to produce a filled thermoplastic composite railroad tie. The tie is a useful replacement for wood products having several physical property advantages and being suitable made from recycled plastic and waste byproduct filler.
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Demer Corporation
Morano S. Joseph
LandOfFree
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