JPS5837264B2 - How to color plate glass - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a so-called staining method in which silver ions are diffused into the surface layer of a plate glass to form a reductive color. The present invention relates to a method of coloring plate glass having shading by changing the shading.

For example, in order to remove the glare of sunlight that enters through the windshield of a car, a band-shaped colored layer is provided on the upper edge of the windshield to absorb or reflect sunlight.
Furthermore, a vehicle glass with a so-called shade band is used in which the color density at the boundary between the colored portion and the non-colored portion is continuously changed to eliminate discomfort to the driver.

Conventionally, as a method for manufacturing vehicle glass with such a shade band, a part of the surface of the glass plate is coated with a solution containing a noble metal compound and a metal compound, and the glass plate is fired at a high temperature to make the glass plate. When forming a metal oxide film containing fine precious metal particles dispersed in colloidal form on the surface, a gradient is set in the heating temperature to suppress the coloring effect in the film, and the light transmittance of the coated area is adjusted to the surface of the glass plate. A method is known in which the amount is gradually increased toward a transparent region.

However, with this method, it is difficult to adjust the light transmittance, and since a metal oxide film is formed on the surface of the glass plate, the reflectance increases and the film is damaged. .

The present invention eliminates the drawbacks of the conventional methods as described above.

In other words, the gist of the invention is to form an ink layer containing silver particles and a transition metal oxide on the surface of a glass plate into which reducible ions have been diffused in advance, and then heat the plate glass to infuse silver into the surface layer of the plate glass. A method for coloring a plate glass by diffusing ions and reductively coloring the silver ions, the method providing the plate glass with shading of color by changing the amount per unit area of the ink layer formed on the plate glass surface. This is a method for coloring plate glass characterized by the following.

Here, the reducing ions are metal ions such as tin, iron, antimony, arsenic, etc., and are used to reduce and color the silver ions diffused into the surface layer of the plate glass.

Furthermore, if a plate glass manufactured by the float glass method in which the plate glass is formed on a molten tin bath is used, reducing tin ions have already been introduced into the surface layer of the plate glass, so reducing ions can be newly introduced into the surface layer of the plate glass. There's no need.

Since the larger the specific surface area of silver particles, the more easily they are ionized by transition metal oxides, silver particles preferably have a particle size of 10μ or less, more preferably 0.
．． It is 1μ or less.

Examples of transition metal oxides include Mn 0 2 +WO3, Fe, which can promote the ionization of silver particles by transferring and receiving electric charge due to changes in valence at the heating temperature in the normal staining method.
One or more of 304 and Cr203 are preferred.

The mixing ratio of silver particles and transition metal oxide is 1:0.25-1
:10 is preferable; silver particles/transition metal oxide - If it is less than 1/10, the mixing ratio of silver particles is small, resulting in a decrease in coloring density and non-uniformity of coloring. If the oxide is 1/0.25 or more, the mixing ratio of the oxide is small, which makes it difficult for silver to diffuse, resulting in a decrease in coloring density and non-uniformity in coloring.

As a method of changing the amount of ink containing silver particles and transition metal oxides per unit area of plate glass, for example, ink containing silver particles and transition metal oxides mixed with a binder can be used to print halftone dots of gravure plate making method. Using plates with varying areas, the transfer paper printed on the transfer mount is transferred onto the plate glass.

Alternatively, a printing plate with the same halftone dot area for halftone gravure is used, but a transfer paper with a partially different number of printings is used as a transfer mount.

The plate glass on which the ink layer is formed is heated to, for example, 500 to 600°C.
heating to diffuse silver ions into the surface layer of the plate glass, resulting in reduction and color development.

Next, an example of implementing the present invention will be described.

When manufacturing a transfer paper 5 in which an ink layer 3 containing silver particles and a transition metal oxide is formed on a transfer mount 1 via a release layer 2, and an adhesive layer 4 is provided on the upper surface of the ink layer 3. The ink layer 3 uses a net gravure plate-making method, and the net gravure coats the release layer 2 with silver particles and Printing an ink containing transition metal oxides.

Alternatively, printing is performed multiple times using a printing plate with a constant halftone dot area so that the printing thickness of the ink layer on the release layer 2 decreases one step at a time at the ends and forms a staircase.

Using the transfer paper 5 on which the ink layer 3 has been printed, it is thermally transferred onto the upper part of an automobile windshield 6 at a temperature of about 200°C, and then heated at about 550°C for 15 minutes to transfer silver ions to the windshield 6. was diffused into the surface layer to develop a reduction color.

Thereafter, the windshield 6 was cooled and the residue of the ink layer on the surface was removed.

As a result, as shown in FIGS. 2 and 4, a shade band in which the coloring density of the boundary part 9 between the colored part 7 and the non-colored part 8 changed continuously, and a shade band as shown in FIGS. 3 and 5. A shade band was obtained in which the color density at the boundary part 9 between the part 7 and the non-colored part 8 changed stepwise.

The ink containing silver particles and transition metal oxides was a mixture of Ag and MnOs in a ratio of 1:3 and 1/2 times as much binder.

According to the present invention, when an ink layer containing silver particles and transition metal oxides is formed on a plate glass and silver ions are diffused into the surface layer of the plate glass, the ink layer does not melt and flow. It is easy to change the shape of shading, and since it does not generate corrosive decomposition gas, it does not corrode plate glass, and it has the remarkable effect that it can provide a colored surface suitable for automobile windshield shade bands, etc. It has the following.

[Brief explanation of drawings]

The drawings show embodiments of the present invention; FIG. 1 is a cross-sectional view of the transfer paper, FIGS. 2 and 3 are plan views of the manufactured windshield with a shade band, and FIGS. 4 and 5 are The change in color density of the shade band is expressed by the change in total light transmittance. 1...Transfer mount, 2...Release layer, 3.
... Ink layer, 4 ... Adhesive layer, 5 ...
... Transfer paper, 6 ... Automobile windshield, 7 ... Colored part, 8 ... Non-colored part, 9
・・・・・・Border area.

Claims (1)

[Scope of Claims] 1. After forming an ink layer containing silver particles and a transition metal oxide on the surface of a glass plate into which reducible ions have been diffused in advance, the plate glass is heated to infuse silver into the surface layer of the plate glass. A method for coloring plate glass in which ions are diffused and the silver ions are reduced to produce color, the method comprising: changing the amount per unit area of the ink layer formed on the surface of the plate glass, thereby changing the shade of color on the plate glass. A method for coloring plate glass characterized by providing. 2. When forming an ink layer containing silver particles and transition metal oxides on the surface of a plate glass, the ink layer is applied to the plate glass using a transfer paper printed on a transfer mount so that the amount of the ink layer per unit area varies. 2. A method for coloring plate glass according to claim 1, wherein the coloring method is characterized in that the coloring method is performed by transferring.