Polymer-modified cements with improved chemical resistance
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United States of America Patent
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Nov 10, 1992
Grant Date -
N/A
app pub date -
Dec 14, 1989
filing date -
Dec 14, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A coating composition is used for coating or overlaying Portland cement concrete or metal. The composition includes a synthetic polymer latex having ureido functional groups, an amine-functional epoxy curing agent, a liquid epoxy resin, and a hydraulic cement. The coating composition has superior thermal shock resistance and low cost in comparison with epoxy/amine-type polymer concrete, and excellent strength development and chemical resistance in comparison with conventional latex-based cementitious compositions. The coating composition can be mixed from a pair of storage-stable components; a dry mix including the hydraulic cement and the epoxy resin, and optionally larger size aggregate, and a wet mix including the polymer latex and the amine curing agent. The two components can be mixed on site to give a fluid coating composition having a good pot life and low viscosity, which rapidly develops strength, and ultimately develops high compressive strength, thermal shock resistance, and resistance to chemical attack, especially attack by aqueous acids.
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