Sony Corporation

Nippon Paint Surf Chemicals Co., Ltd.

Denso Corporation

Yuko Wada

Akihiro Mizuno

Kazushi Kirihara

Hiroshi Nakaizumi

Norizumi Matsui

Miya Suwa

Toshio Ohya

Koichi Saito

Miwa Uchikawa

Sohei Kaneko

Junsuke Hokka

Masako Umeda

Toru Ichikawa

Takayuki Hirose

Masahiko Matsukawa

Yuko Suzuki

Kenji Nakamura

Kengo Kobayashi

Yoshie Nagasaka

Akira Utsunomiya

Hitoshi Kayama

Ellen Tave

Rosalin Yin

Shota Sasaki

Junsuki Hokka

Ayako Obora

The present invention provides an aqueous surface treatment agent which is used for surface treatment of a metal and contains a trivalent chromium compound (A), a water-soluble or water-dispersible acrylic resin (B), a polyfunctional epoxy compound (C) and a phosphoric acid compound (D), wherein: the water-soluble or water-dispersible acrylic resin (B) has a weight average molecular weight of 30,000 to 1,000,000 and a solid acid value of 500 mgKOH/g to 780 mgKOH/g; the ratio of the mass of trivalent chromium contained in the trivalent chromium compound (A) to the total mass of solids is 3% to 15%; the ratio of the mass of solid content of the polyfunctional epoxy compound (C) to the total mass of solids is 1% to 15%; and the ratio of the mass of solid content of the phosphoric acid compound (D) to the total mass of solids is 5% to 25%.

Aqueous surface treatment agent and surface-treated metal

Provided are an aqueous resin dispersion of an ethylene-vinyl alcohol copolymer exhibiting excellent dispersion stability, a production method for the aqueous resin dispersion, a hydrophilization agent including the aqueous resin dispersion, a hydrophilization method using the hydrophilization agent, a metal material on which a hydrophilic coating has been formed, and a heat exchanger on which a hydrophilic coating has been formed. Specifically provided are: an aqueous resin dispersion comprising an ethylene-vinyl alcohol copolymer (A) and a radical polymer (B) having a structural unit derived from a radical-polymerizable carboxylic acid monomer (B1-1), wherein the content of the radical polymer (B) is 10-80 mass % relative to the total content of the ethylene-vinyl alcohol copolymer (A) and the radical polymer (B); a production method for the aqueous resin dispersion; a hydrophilization agent including the aqueous resin dispersion; a hydrophilization method using the hydrophilization agent; a metal material on which a hydrophilic coating has been formed; and a heat exchanger on which a hydrophilic coating has been formed.

Aqueous resin dispersion, production method for aqueous resin dispersion, hydrophilization agent, hydrophilization method, metal material, and heat exchanger

The present invention provides a heat exchanger which is imparted with high deodorizing properties in terms of cigarettes. A heat exchanger which has a hydrophilic coating film on the surface of a substrate that is formed from aluminum, and wherein the hydrophilic coating film is formed using a hydrophilizing agent that contains 0.8-1.8% by mass of a vanadium compound in terms of elemental vanadium, while containing 90% by mass or more of a resin which contains 38-40% by mass of a polyvinyl alcohol having an ethylene chain, 22-24% by mass of a radically polymerizable monomer having a carboxylic acid, 15-17% by mass of a radically polymerizable monomer represented by general formula and 22-24% by mass of a polyethylene glycol.

Heat exchanger and method for hydrophilizing heat exchanger

Provided is a surface processing method for an aluminum heat exchanger, by which odor can be suppressed and which enables the aluminum heat exchanger to exhibit corrosion resistance and moisture resistance that are excellent to conventional art. The surface processing method for an aluminum heat exchanger uses a chemical conversion treatment agent that includes: one, or two or more type of a metallic element (A) selected from a group comprising of zirconium, titanium, and hafnium; vanadium element (B); and a resin (C). The resin (C) includes a polyvinyl alcohol resin (C1). The ratio (Wa/Wb) of the weight-based total content (Wa) of the metallic element (A) relative to the weight-based content (Wb) of vanadium element (B) is 0.1-15, and the ratio ((Wa+Wb)/Wc1) of the weight-based total content (Wa+Wb) of the metallic element (A) and vanadium element (B) relative to the weight-based total content (Wc1) of the polyvinyl alcohol resin (C1) is 0.25-15.

Surface processing method for aluminum heat exchanger

A chemical conversion agent which is capable of providing, for example, an aluminum-based metal material with excellent corrosion resistance and moisture resistance, while also providing the aluminum-based metal material with excellent adhesion with a laminate film, excellent hydrofluoric acid resistance, and excellent alkali resistance. The chemical conversion agent has (1) a mass concentration of zirconium of 5-5,000 ppm by mass; (2) a mass concentration of titanium is 5-5,000 ppm by mass; (3) a mass concentration of vanadium is 10-1,000 ppm by mass; (4) a mass concentration of a metal stabilizer is 5-5,000 ppm by mass; and (5) the pH is 2-6.

Chemical conversion agent and chemical conversion coating film

A surface treatment method capable of imparting exceptional corrosion resistance and moisture resistance to an NB heat exchanger. The method includes subjecting an NB heat exchanger to a chemical conversion treatment to form a chemical conversion film on the surface thereof using a chemical conversion treatment agent that contains zirconium and/or titanium in a total amount of 5-5,000 ppm by weight, vanadium in an amount of 10-1,000 ppm by weight, and has a pH of 2-6; bringing the NB heat exchanger on whose surface the chemical conversion film is formed into contact with a hydrophilization agent containing a hydrophilic resin and a guanidine compound and/or a salt thereof; and baking the NB heat exchanger subjected to the contacting process, whereby a hydrophilic film is formed on the surface thereof.

Method for treating surface of aluminum heat exchanger

A surface treatment method for aluminum heat exchangers including (a) a step wherein a chemical conversion coating film is formed on the surface of an aluminum heat exchanger by subjecting the aluminum heat exchanger to chemical conversion using a chemical conversion agent; (b) a step wherein the aluminum heat exchanger, the surface of which has been provided with a chemical conversion coating film in step (a), is brought into contact with a hydrophilizing agent that contains a hydrophilic resin; and (c) a step wherein a hydrophilized coating film is formed on the surface of the aluminum heat exchanger by baking the aluminum heat exchanger, which has been subjected to a contact treatment in step (b). The chemical conversion agent used in step (a) contains zirconium and/or titanium in an amount of 5-5,000 ppm by mass in total, vanadium in an amount of 10-1,000 ppm by mass and a metal stabilizer in an amount of 5-5,000 ppm by mass. In addition, the chemical conversion agent used in step (a) has a pH of 2-6.

Surface treatment method for aluminum heat exchangers

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Tokyo, Japan

Yuko Wada