Hydrophilic film, process for producing the same, and paint for formation of hydrophilic film

Inactive Publication Date: 2005-07-14
SUMITOMO OSAKA CEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, films formed by these methods suffer from a number of drawbacks, including poor durability with respect to detergents.
In the method (3), which involves applying a hydrophilic photocatalyst, satisfactory effects cannot be achieved in darker locations, and moreover, the silica binder used to fix the photocatalyst is alkaline, and degrades in the presence of neutral detergents.
In the method (4), which involves forming an inorganic coating, only heat resistant materials can be treated by enameling or thermal spraying, and the resulting coatings also display poor impact resistance.
Furthermore, silica films degrade in the presence of neutral or alkaline detergents.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of a Film on a Glass Plate

[0057] To 10 g of tetraethoxysilane were added 80 g of ethanol, 9 g of butoxyethanol, and 1 g of a 1% aqueous solution of nitric acid, and the mixture was then heated at 60° C. with stirring for 24 hours to allow the hydrolysis reaction to proceed, yielding a silica sol solution. Next, 1 g of zirconium oxynitrate, 0.1 g of aluminum nitrate, 0.1 g of zinc nitrate, 1 g of lithium nitrate, and 1 g of polyacrylic acid were dissolved in water and the solution was made up to 100 g. 50 g of each of the two solutions were then mixed together, and the pH was adjusted to pH1 using nitric acid, thus yielding a coating material. The solid fraction concentration of this coating material was approximately 5%, and the chemical composition (weight ratios) of this solid fraction on heating to 300° C., determined using wet chemical analytical methods, was SiO2: 58%, ZrO2: 11%, Al2O3: 0.4%, ZnO2: 0.8%, Li2O: 4%, H2O: 7%, and polyacrylic acid: 19%. The heated prod...

example 2

Preparation of a Film on a Stainless Steel Plate

[0058] To 10 g of zirconium tetrabutoxide were added 80 g of isopropyl alcohol, 9 g of colloidal silica (a 30% aqueous dispersion), and 1 g of lithium nitrate, and the pH was then adjusted to pH1 using nitric acid, thus yielding a coating material. The solid fraction concentration of this coating material was approximately 6%, and the chemical composition (weight ratios) of this solid fraction on heating to 200° C., determined using wet chemical analytical methods, was SiO2: 40%, ZrO2: 40%, Li2O: 3%, and H2O: 7%. The heated product contained approximately 7% water, and because this water had not evaporated even at 200° C., it is thought to represent solidified water of hydration. Furthermore, the results of X-ray diffraction showed no particular crystalline materials, indicating an amorphous mixed oxide. This coating material liquid was applied to a stainless steel plate using spraying, and was then heated at 200° C. for 10 minutes, t...

example 3

Preparation of a Film on an Acrylic Sheet

[0059] 8 g of tetraethoxysilane, 1 g of trimethoxyphenylsilane, and 1 g of zirconium tetrabutoxide were dissolved in 45 g of isopropyl alcohol, and 40 g of a 1% aqueous solution of sodium nitrate was then added. An additional 5 g of 2-hydroxyethyl methacrylate was then added, and the pH was adjusted to pH1 using hydrochloric acid, thus yielding a coating material. The solid fraction concentration of this coating material was approximately 8%, and the chemical composition (weight ratios) of this solid fraction on heating to 100° C., determined using wet chemical analytical methods, was SiO2: 23%, ZrO2: 3%, Na2O: 2%, resin components: 50%, and H2O: 22%. The heated product contained 22% water, and because this water had not evaporated even at 100° C., it is thought to represent solidified water of hydration. Furthermore, the results of X-ray diffraction showed no particular crystalline materials, indicating an amorphous mixed oxide. This coatin...

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Abstract

The present invention provides a hydrophilic film, which displays excellent hydrophilicity, and also displays excellent durability with respect to acidic, neutral, and alkaline detergents and chemicals. A hydrophilic film of the present invention comprises a double oxide of silicon and zirconium, an alkali metal, and water. Furthermore, the film may also comprise aluminum or a bivalent metal, and may also contain at least one of a silane coupling agent and an acrylic resin.

Description

TECHNICAL FIELD [0001] The present invention relates to a hydrophilic film formed on the surface of a variety of metal, organic or inorganic materials, for the purposes of protecting the material surface and suppressing the adhesion of soiling to the material surface, and relates particularly to a hydrophilic film with superior characteristics, which does not degrade or separate even when washed with detergents. BACKGROUND ART [0002] Conventional methods for hydrophilizing the surfaces of materials include (1) applying a surfactant, (2) applying a water absorbing resin, (3) applying a hydrophilic photocatalyst, (4) forming either an inorganic coating by enameling or ceramic thermal spraying, or a silica film, and (5) mixing a hydrophilic component with a resin coating agent. For example, Japanese Unexamined Patent Application, First Publication No. 2000-191960 discloses a hydrophilic coating that uses a photocatalyst. [0003] However, films formed by these methods suffer from a numbe...

Claims

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Application Information

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IPC IPC(8): C03C17/00C03C17/25C09D1/00C09D5/38C23C26/00C23C30/00
CPCC03C17/008C03C17/009C03C17/25C03C2217/213C03C2217/22C23C30/00C03C2217/29C03C2218/113C09D1/00C09D5/38C23C26/00C03C2217/23B32B9/00C03C17/02C09D1/02
Inventor SHIGERU, KEIJIROMAEDA, DAISAKU
Owner SUMITOMO OSAKA CEMENT CO LTD
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