Coating processes – Interior of hollow article coating – Rotating the article
Patent
1995-05-22
1998-03-10
Reddick, Judy M.
Coating processes
Interior of hollow article coating
Rotating the article
427230, 427240, 4273936, B05D 722
Patent
active
057259062
ABSTRACT:
A polymer concrete pipe liner is formed from a fluidized, but substantially waterless cement containing mixture applied to the pipe interior. The mixture contains inorganic cement particles, a liquid styrene mixture and one or more poly-olefinically unsaturated co-monomers in a greater amount than the styrene. The mixture substantially excludes acrylonitrile and acrylamide. The co-monomers are preferably selected from a group including trimethylolpropane-trimethacrylate, trimethylolpropane-methacrylate, divinyl benzene, and hexadiene. Mixing liquid and solid aggregate components forms a slurry which is transferred to a pipe interior and centrifugally cast to form the liner. The composition avoids the need for high temperature curing the toxic reactive unsaturates to co-polymerize and cross-link polystyrene. A preferred embodiment incorporates the use of relatively high concentrations of cement material, usually above about 40 weight percent of the aggregate component of the mixed slurry, to further improve chemical resistance and strength characteristics.
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Jacobson William O.
Reddick Judy M.
Thompson Alan H.
Union Oil Company of California
Wirzbicki Gregory F.
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