Hydrophilic surface treating aqueous solution, hydrophilic surface treating method and hydrophilic surface treating film

• US 5,478,872 A
• Filed: 05/06/1994
• Issued: 12/26/1995
• Est. Priority Date: 05/07/1993
• Status: Expired due to Term

• Current Assignee: Nippon Paint Company Limited (Rainbow Light Limited)
• Original Assignee: Nippon Paint Company Limited (Rainbow Light Limited)
• Inventors: Mizohata, Kouji, Matsukawa, Masahiko, Yamasoe, Katsuyoshi, Hirasawa, Hidekimi, Mikami, Fujio
• Primary Examiner(s): Szekely, Peter A.
• Application Number:
  US08/239,136
• Time in Patent Office: 599 Days
• Field of Search: 523/402, 523/409, 523/504, 524/43, 524/413, 524/457, 524/458, 524/459, 524/460, 524/510, 524/514, 524/538, 524/591, 524/596, 524/598, 524/608, 524/501, 524/512, 524/542, 524/45, 524/221, 524/503
• US Class Current: 524/45
• CPC Class Codes: C08F 283/00 Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 71/02 Polyalkylene oxides
• CPC Class Codes: C09D 4/06 Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00
• CPC Class Codes: F28D 17/005 using granular particles
• CPC Class Codes: F28F 13/04 by preventing the formation of continuous films of condensate on heat-exchange surfaces, e.g. by promoting droplet formation F28F13/18 takes precedence
• CPC Class Codes: F28F 13/18 by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing
• CPC Class Codes: F28F 2245/02 hydrophilic

Abstract

It is the object of the present invention to provide a hydrophilic surface treating aqueous solution, hydrophilic surface treating method, and hydrophilic surface treating film with lasting hydrophilicity and ensuring a film having a good processability. The hydrophilic treating aqueous solution contains as main components a hydrophilic polymer having a specific molecular weight and containing a polyoxyalkylene chain of 10 wt % or more in terms of solid content, and a specific aqueous resin. This enables the formation of film with good processability and good hydrophilicity and persistency of hydrophilicity on the surface of aluminum or aluminum alloy for use in aluminum fins of a heat exchanger, as well as suppressing the generation of unpleasant odor.

Claims

1. A hydrophilic surface treating aqueous solution comprising:

(I) a polyethylene oxide or ethylene oxide/propylene oxide copolymer containing polyoxyalkylene chain in an amount of 10 wt % or more in terms of solid content and having a weight-average molecular weight of 10,000 to 2,000,000 in an amount of 10-78 parts by weight;

(II) at least one resin selected from the group consisting of polyvinyl alcohol, polyvinyl pyrrolidone and carboxyl methylcellulose in an amount of 10-78 parts by weight;

(III) 10-70 parts by weight of N-methylol acrylamide; and

at least one member selected from the group consisting of homopolymers of acrylic acid or methacrylic acid and copolymers of acrylic acid or methacrylic acid comprising at least one of said acids, in an amount of 2-70 parts by weight.

2. The hydrophilic surface treating aqueous solution according to claim 1, wherein

the polyoxyalkylene chain of said aqueous polymer (I) is 10 parts or more by weight with respect to a total 100 parts by weight in solid content of components consisting of said components (I), (II), (III) and (IV).

3. The hydrophilic surface treating aqueous solution according to claim 1, wherein said polyethylene or ethylene oxide/propylene oxide copolymer (I) has a weight-average molecular weight of 20,000 to 1,000,000.

4. The hydrophilic surface treating aqueous solution according to claim 1, wherein said component (I) is polyethylene oxide.

5. The hydrophilic surface treating aqueous solution according to claim 1, wherein said component (IV) is polyacrylic acid.

6. The hydrophilic surface treating aqueous solution according to claim 1, further containing at least one inorganic crosslinking agent selected from the group consisting of a chromium, titanium, aluminum, zinc, and zirconium compound.

7. The hydrophilic surface treating aqueous solution according to claim 6, wherein said inorganic Crosslinking agent is H₂ ZrF₆.

8. The hydrophilic surface treating aqueous solution according to claim 1, wherein

said hydrophilic surface treating aqueous solution contains in terms of solid content 5 to 50 parts by weight of said polyethylene oxide or ethylene oxide/propylene oxide copolymer (I) and 5-50 parts by weight of polyacrylic acid, with respect to a total of 100 parts by weight of components consisting of:

(i) 5 to 25 parts by weight of the sodium salt and/or potassium salt of carboxymethyl cellulose;

(ii) 25 to 50 parts by weight of the ammonium salt of carboxymethyl cellulose; and

(iii) 25 to 70 parts by weight of N-methylol acrylamide.

9. The hydrophilic surface treating aqueous solution according to claim 6, wherein

said hydrophilic surface treating aqueous solution contains in terms of solid content of 5 to 50 parts by weight of said polyethylene oxide or ethylene oxide/propylene oxide copolymer (I), 5 to 50 parts by weight of polyacrylic acid and 0.6 to 9 parts by weight of zirconium compound (as Zr), with respect to a total of 100 parts of components consisting of:

(i) 5 to 25 parts by weight of the sodium salt and/or potassium salt of carboxymethyl cellulose;

(ii) 25 to 50 parts by weight of the ammonium salt of carboxymethyl cellulose; and

(iii) 25 to 70 parts by weight of N-methylol acrylamide.