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Functional coated product and process for producing the same and the use thereof

Inactive Publication Date: 2005-10-25
MATSUSHITA ELECTRIC WORKS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]An object of the present invention is to provide a functional coated product which has excellent adhesion properties to various substrates, hardly causes the deterioration of the substrate and a coating due to the action of a photocatalyst and also has high photocatalytic function, and a process for producing the same and the use thereof.

Problems solved by technology

However, the photocatalytic organicpaint has a drawback that the coating is deteriorated due to ultraviolet rays and photocatalytic function.
Therefore, the range of usage is limited, and it was not suitable for applying them directly to a construction material or plastic which has inferior heat resistance.
Further, the silicate inorganic paint has also a drawback that an alkali was eluted to cause a whitening phenomenon easily.
This inorganic paint is cured at a temperature of not more than 200° C., however, the coating does not have flexibility and there was a problem that crack easily occurred.
However, when a photocatalyst was supported on a substrate, there was a problem concerning the limitation of the substrate or adhesion properties.
Further, there was a tendency that the photocatalyst was precipitated in the paint, and the performance of the photocatalyst was not easily exhibited.
This coating has high adhesion to an inorganic substrate, however, it has poor adhesion to the surface of plastic or a material coated with an organic substance.
Further, a coating of the above-mentioned inorganic coating lacks in smoothness on the surface, therefore there was a drawback that dirt is easily adhered.
Further, when a paint containing a photocatalyst is directly applied to the surface of an organic substrate or a substrate coated with an organic substance, there was a problem that said substrate was easily deteriorated due to the action of the photocatalyst.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1-1

[0127]Into a flask equipped with a stirrer, a warming jacket, a condenser, a dropping funnel and a thermometer were charged 100 parts of methyltrimethoxysilane, 20 parts of tetraethoxysilane, 105 parts of IPA-ST (colloidal silica sol dispersed in isopropanol: a particle diameter of 10 to 20 nm, a solid content of 30%, a water content of 0.5% manufactured by Nissan Kagaku Kogyo Co.), 30 parts of dimethyldimethoxysilane, 100 parts of isopropanol. Thereafter, 100 ppm of hydrochloric acid based on the solid content of the whole condensate (30%) of this solution, and water of 3% on the basis of the above silicon alkoxide, were added to this solution mixture for hydrolysis at 25° C. for 30 minutes while stirring the mixture. After cooling, the silicone coating solution having an average molecular weight of about 1,700 was obtained. To this were added 0.2 parts of lithium formate as a curing catalyst and titanium oxide as a photocatalyst (STS-01 manufactured by Ishihara Sangyo Co., an aver...

preparation examples 1-2 to 1-5

[0128]Functional coating materials (1-2) to (1-5) were obtained in the same manner as in Example 1, except that the amount of the photocatalyst which was added was changed such that the resin solid content / photocatalyst weight ratio was 60 / 40, 50 / 50, 40 / 60 and 20 / 80, respectively. Further, the average molecular weight of the organosiloxane was about 1,700 ((1-2) to (1-5)).

preparation example a-1

[0132]Into a flask equipped with a stirrer, a warming jacket, a condenser and a thermometer were charged 100 parts of IPA-ST (colloidal silica sol dispsesed in isoprppanol: a particle diameter of 10 to 20 nm, a solid content of 30%, a water content of 0.5% manufactured by Nissan Kagaku Kogyo Co.), 68 parts of methyltrimethoxysilane and 2.2 parts of water were charged. Then, the hydrolysis was conducted at 65° C. for 5 hours while stirring the mixture. After cooling, Companent (A-1) was obtained. The solid content of the whole condensate of this component was 37% when it was left to stand at room temperature for 48 hours.

Conditions of the Preparation of A-1

[0133]The amount of water based on 1 mol of a hydrolytic groups (mol)40.1.

[0134]The amount of silica contained in Component (A-1) 47.3%

[0135]The amount of hydrolytic organosilane in which m=1 (mol %) 100 (mol %)

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Abstract

The present invention provides a functional coated product having excellent adhesion properties of a coating to a substrate, hardly causing the deterioration of the substrate and the coating due to a photocatalyst, hardly having dirt because the smoothness of the surface coating is high, and having high photocatalytic action; a method for producing the same and the use thereof.The coated product of the present invention has the first coating layer comprising a cured coating made of an acryl-modified silicone resin coating material, which is formed on the surface of the substrate, and the second coating layer comprising a cured coating made of a functional coating material containing the photocatalyst, which is formed con the surface of the first coating layer. When producing such a coated product, the acryl-modified silicone resin coating material is applied to the surface of the substrate as the first coating layer and it is semi-cured. After that, a photocatalyst-containing functional coating material is applied to the surface of this first coating layer in a semi-cured condition and then both of the coating layers are cured. Thereby, a coated product having a higher effect can be obtained.

Description

[0001]This application is the national phase under 35 U.S.C. §371 of prior PCT International Application No. PCT / JP97 / 04559 which has an International filing date of Dec. 11, 1997 which designated the United States of America, the entire contents of which are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a functional coated product having photocatalytic activity and a process for producing the same and the use thereof.[0004]2. Description of the Prior Art[0005]When a photocatalyst is added to a coating material, the resulting coating is irradiated by ultraviolet light to exhibits a decomposing effect of organic substances, deodorizing effect, antifungal effect, etc.[0006]As a coating material having such photocatalytic function, for example, a photocatalytic organic paint in which photocatalytic particles are dispersed in organic resin is known. However, the photocatalytic organicpaint has a drawback...

Claims

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Application Information

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IPC IPC(8): B05D7/24B32B15/08B62D63/02B01J35/02B05D1/36B05D5/00B05D7/00B32B27/00C09D5/00C09D7/12C09D183/04F21V7/22
CPCB05D7/546Y10T428/31663Y10T428/31667
Inventor IKENAGA, JUNKOYAMAKI, TAKEYUKITAKAHAMA, KOICHISAKO, TOSHIHARUKISHIMOTO, HIROTSUGU
Owner MATSUSHITA ELECTRIC WORKS LTD
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