Chromium-free water reducible rust inhibitive paint for metals
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United States of America Patent
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Nov 1, 2005
Grant Date -
Feb 3, 2005
app pub date -
Jul 20, 2004
filing date -
Jul 22, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Provided is a chromium-free rust inhibitive paint for metals which is obtained by mixing a flaky zinc powder into a water reducible binder solution containing a water reducible resin emulsion and a water soluble silane coupling agent. A thin film of a silane compound having a hydrophobic group is added to particle surfaces of the flaky zinc powder, whereby the flaky metallic zinc powder exhibits water repellent property. When a surface treatment agent which contains an alkoxysilane oligomer as an essential component is applied to the paint film of a rust inhibitive paint for metals, this extends the time until red rusting occurs on painted metal products to not less than twice and prevents white rusting and black rusting for a long time. Rust inhibitive performance is further improved by blending a nano-sized powder of titanium dioxide, polyvinyl butyral, a silane coupling agent, etc., with the surface treatment agent.
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