JPH0753896A - Photochromic coating - Google Patents

Abstract

PURPOSE:To obtain a photochromic coating having excellent color developing properties. CONSTITUTION:This photochromic coating contains 0.1-7.0wt.% (expressed in terms of sodium oxide) of a sodium compound, 0.2-8.0wt.% (expressed in terms of metal oxide) of a metal compound consisting of at least one kind of iron, chromium, copper, nickel, vanadium and manganese and 0.01-90wt.% of a titanium oxide-based compound in which the balance other than the above two components is titanium oxide.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating material having a color rendering effect called photochromic property.

[0002]

2. Description of the Related Art Conventionally, white pigments such as titanium oxide, zinc sulfide, lead white, lithopone, and zinc white are used in paints for coloring white, changing the shade, and imparting hiding power. . These white pigments are stable and have excellent hiding power, but since the whiteness is constant, they exhibit a constant color tone even when the light intensity changes. Therefore, even when a good color tone is exhibited in the early morning, the evening, or the room where the light is weak, white is emphasized too much under the sunlight or strong illumination, and good color rendering cannot be obtained.

[0003]

In view of the above circumstances, the present inventor has made earnest studies to obtain a coating having excellent color rendering properties, and as a result, solved the above problems by using a specific titanium oxide-based powder. The inventors have found that a photochromic coating can be obtained, and completed the present invention.

[0004]

[Means for Solving the Problems] That is, according to the present invention, a metal compound containing 0.1 to 7.0% by weight of sodium compound in terms of sodium oxide and at least one of iron, chromium, copper, nickel, vanadium and manganese is used. Provided is a photochromic coating material, wherein the content of the metal oxide is 0.2 to 8.0% by weight, and the balance of the two components is 0.01 to 90% by weight of a titanium oxide compound in which titanium oxide is contained. There is.

The present invention will be described in more detail below. The coating composition of the present invention has a photochromic property of about 0.0
1 to about 90% by weight of a titanium oxide compound. As the titanium oxide compound, a sodium compound is about 0.1 to about 7.0 wt% in terms of sodium oxide, and a metal compound made of at least one of iron, chromium, copper, nickel, vanadium and manganese is in terms of metal oxide. About 0.2
It is preferable that the titanium oxide-based compound, which has a balance of titania of about 8.0 to about 8.0% by weight, has excellent photochromic properties.

Such a titanium oxide compound is disclosed in Japanese Patent Laid-Open No.
It can be produced by the methods described in JP-A-17152 and JP-A-5-51209. Since this titanium oxide compound has a large degree of discoloration when irradiated with visible light or ultraviolet rays, a good discoloration effect can be obtained even if it is added in a small amount. Further, by changing the addition amount, a photochromic coating material that reacts with a wide range of visible or ultraviolet light intensity can be obtained. Therefore, the content of the titanium oxide-based compound can be selected in the range of about 0.01 to about 90% by weight depending on the application.

As the coating material to which the titanium oxide compound is mixed, known coating materials can be used. Paint for example,
Oil paints such as varnish and enamel, fibrin derivative paints such as clear lacquer and lacquer enamel, alkyd resin paints, vinyl chloride paints, epoxy resin paints, synthetic resin paints such as urethane paints, vinyl acetate latex paint, styrene butadiene latex paint, etc. Synthetic resin emulsion paint, water-based baking paint, powdery water-based paint, paint such as lacquer.

As a method for mixing the titanium oxide compound, a ball mill, a colloid mill, a mixer, a roller mill,
It is possible to mix, disperse, and knead by a known method such as an attritor, a turbine type disperser, and a kneader. Incidentally, various performance-imparting materials, for example, a gas barrier-imparting material may be used in combination with the coating film as long as the characteristics of the present invention are not impaired.

[0009]

According to the present invention described in detail above, a paint having a color rendering effect called photochromic property can be obtained. When the coating material obtained by the present invention is applied to an automobile or a building, the titanium-based compound added is blackened while being exposed to a strong light ray in the daytime, so that a deep and deep texture does not strangely appear white. On the other hand, in the nighttime, fading of black color at night makes it possible to obtain an excellent color rendering property such that the visibility is enhanced and the effect such as light-up is conspicuous, and its industrial value is extremely large.

[0010]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples.

Example 1 300 g of titanium isopropoxide (trade name; A-1 manufactured by Nippon Soda Co., Ltd.) and 0.94 of iron acetylacetonate.
g (trade name; Nasem Ferric Nippon Chemical Industry Co., Ltd.) and sodium ethylate 4.6 g (Sumitomo Pharmaceutical Co., Ltd.) were dissolved in isopropyl alcohol. Water 66.
2 g was added for hydrolysis. The obtained powder was fired in an electric furnace at 680 ° C. for 1 hour to give sodium oxide 0.50.
A photochromic titanium oxide was obtained in which the weight percent was 0.25 weight percent iron oxide and the balance was titanium oxide. Using this photochromic titanium oxide, an aminoalkyd resin having the following composition was mixed and dispersed by a ball mill, spray-coated on the body of an automobile, and then baked at 140 ° C. for 30 minutes.
The painted body had a deep gray appearance due to blackening of the photochromic titanium during the day, but at night it turned pure white and became a gorgeous appearance. In addition, the white color that floats up when illuminated by a light enhances the visibility and provides good safety.

Composition of aminoalkyl resin: rutile titanium oxide 150 kg, photochromic titanium oxide 150 kg, alkyd resin 370 kg, amino resin 190 kg, xylene 180 kg

Claims (1)

[Claims] 1. A sodium compound is 0.1 to 7.0% by weight in terms of sodium oxide, iron, chromium, copper, nickel,
The metal compound containing at least one of vanadium and manganese is 0.2 to 8.0% by weight in terms of metal oxide, and 0.01 to 90% by weight of the titanium oxide compound in which the balance of the two components is titanium oxide. Photochromic paint characterized by