Hoden Seimitsu Kako Kenkyusho Co., Ltd.

Other

Institute of Technology Precision Electrical Discharge Work's

Hoden Meimitsu Kako Kenkyusho Co., Ltd.

Tomio Sakai

Yasuhiko Endo

Kengo Takase

Hisayuki Sakai

Saburou Shimada

Saburo Shimada

Provided is a chromium-free metal surface treatment agent excellent in rust inhibitive performance which can be used in a surface treatment of metal products, in particular, galvanized metal products. The metal surface treatment agent consists essentially of a siliceous binder solution comprising water and/or alcohol as a solvent, and the concentration of the silica component is 8 to 25% by weight. In particular, a metal surface treatment agent containing an alcoholic solution of alkoxysilane oligomer having a weight averaged molecular weight of 1000 to 10000, which is obtained by hydrolyzed condensation polymerization of alkoxysilane, can suppress the occurrence of white rusting for a long time. It is preferred that 3 to 25 parts by weight of a dispersed nano-sized titanium dioxide powder having an average primary particle size of not more than 70 nm, per 100 parts by weight of the silica component be suspended in the siliceous binder solution. The rust inhibitive performance of the metal surface treatment agent can be further improved by using an alcohol-soluble polyvinyl butyral resin and by adding a silane coupling agent having a vinyl or epoxy group as a functional group, in combination with a dispersed nano-sized powder of titanium dioxide.

Chromium-free metal surface treatment agent

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.

Chromium-free water reducible rust inhibitive paint for metals

A chromium-free corrosion inhibiting coating composition, which does not utilize harmful chromium compounds and can be used for corrosion inhibition of a metal surface, comprising a slurry mixture in which coated aluminum fine powder treated with a hydrophilic coupling agent is suspended in an acidic phosphate bonding solution and which can be stored in a refrigerator, is disclosed. A titanium-coupling agent is preferable to use as the coupling agent, which treats a surface of the aluminum fine powder. In this aqueous chromium-free corrosion inhibiting coating composition, 25 to 40% by weight of the aluminum fine powder a surface of which is treated with the coupling agent is suspended in the acidic phosphate bonding solution.

Surface coated aluminum fine powder and aqueous chromium-free corrosion inhibiting coating composition including the same

It is an object of the present invention to provide a high-gloss, heat-resistant paint composition that can form a paint film having high gloss, hiding power, heat resistance and adhesion, a method for manufacturing the same, a method for applying a high-gloss, heat-resistant paint, and a high-gloss, heat-resistant paint film. The heat-resistant paint composition is prepared by combining inorganic pigment powder having hiding power and a binder solution chiefly consisting of an alcoholic solution of polysilicon alcoxide; the binder solution containing an effective amount of aluminum ingredient; the composition contains 8&tilde;50 wt. % of hydrophilic organic solvent having a boiling point of not less than 100&deg; C. and not more than 220&deg; C.; the average particle size of primary particles of the inorganic pigment powder dispersed in the binder solution being not more than 0.3 &mgr;m; and the solidified paint film obtained when the composition has been dried and baked contains not less than 60 vol. % of a vitreous matrix formed as the result of solidification of binder content.

HIGH-GLOSS, HEAT-RESISTANT PAINT COMPOSITION; A METHOD FOR MANUFACTURING THE HIGH-GLOSS, HEAT-RESISTANT PAINT; A METHOD FOR APPLYING THE HIGH-GLOSS, HEAT-RESISTANT PAINT; AND A HIGH-GLOSS, HEAT-RESISTANT PAINT FILM

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Nagoya, Japan

Tomio Sakai