JPH06275109A - Manufacture of colored glass base, illuminating glass globe, luminaire and electrostatic coating film, and powder - Google Patents

Abstract

PURPOSE:To provide a method of manufacture of a glass base, on the surface of which a coating film having an almost uniform light diffusion property and a uniform color distribution is formed even with a complicated glass base structure, and of an illuminating glass globe, a luminaire and an electrostatic coating film, and to provide powders. CONSTITUTION:A method for forming a colored glass base G on at least one side of which is an electrostatic coating G1 made from powders comprising glass frit and pigment mixed together, an illuminating glass globe formed of the colored glass base G, a luminaire using the illuminating glass globe, and the electrostatic coating film formed by water repellency treatment of the powders and attached to the glass base G by electrostatic painting, is provided, together with the powders having glass frit in which a silyl group is formed and pigment Since application of the powders is achieved by electrostatic painting, the powders can be evenly applied to a surface to be painted, regardless of the form of the surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass craft product having a surface coated with a colored paint such as milky white or red, lighting equipment such as a glass plate or a glass globe for lighting, a method for forming a coating, and powder.

[0002]

2. Description of the Related Art As a means for obtaining a milky white layer on a glass substrate, a glass base is wound around the tip of a blower,
Wrap milky white glass on this, further wrap the glass base on this and finish it into a predetermined integral shape by a method called hand blowing in which it blows through the inside, or paint the glass base with organic paint or water-based paint, sand blast , It was done by applying frost treatment,
Each had problems as described below.

[0003] First, finishing the glass into an integral shape by hand blowing is unstable in quality and requires skill to mold the same thing. In the current situation, the number of skilled workers is insufficient and the cost is very high. It was

When an organic paint in which glass frit and a milky white material are dispersed in an organic solvent is used, the organic solvent is sprayed, the paint is poured, or the paint is dipped in the paint to apply it. However, in addition to problems such as harmfulness and danger, this coating requires a lot of work to reduce the yield due to uneven coating and maintenance of spray tools such as sprays. There are problems such as not being able to. In addition, when using water-based paint, organic substances such as methyl cellulose and polyvinyl alcohol are added as thickeners to the water-based paint to improve the dispersibility of the glass frit and the milky white material. Even after the remaining glass coating is blackened or not blackened, the residual organic matter causes deterioration in appearance, heat resistance, water resistance, and the like, and has the same problem as in the case of the organic solvent.

In the case of sandblasting, abrasive sand is blown onto the glass substrate surface with high pressure gas to make the surface uneven, but this is nothing but a fine scratch (irregularity) on the surface of the glass substrate. The mechanical strength will be significantly reduced.

Further, in the case of the frost treatment, the surface of the glass substrate is etched with hydrogen fluoride to form fine irregularities. In addition to the same problems as in the sandblast treatment described above, hydrogen fluoride is used. There were problems such as waste liquid treatment and bad working environment. In addition to the above, in JP-A-60-226431, a high temperature glass molded product immediately after molding is coated with powder of a high melting point substance such as silica and alumina and a low melting point substance consisting of low melting point glass and frosted. There is a description to obtain the glass product of.

However, in this product, powder is applied to a glass molded product at a high temperature of 300 to 700 ° C., and silica, alumina, etc. are dispersed on the low melting point glass layer fused to the glass molded product, Since this product has a frosted surface with a rough surface, it is difficult to remove dust adhering to the coated surface, and when it is used as a glove for lighting equipment, it is a diffusing light with a shimmering and hard tone. It was

[0008]

SUMMARY OF THE INVENTION The present invention eliminates the above problems and provides a coating film having a substantially uniform light diffusivity and color distribution on the surface thereof even if the glass substrate has a complicated structure. An object of the present invention is to provide a formed glass substrate, a glass globe for illumination, a lighting device, a method for producing an electrostatic coating film, and a powder.

[0009]

The colored glass substrate according to claim 1 of the present invention is an electrostatic glass comprising a glass substrate and a powder formed on at least one surface of the glass substrate and containing a mixture of glass frit and a pigment. It is characterized by having a coating film.

A glass globe for illumination according to a second aspect of the present invention is characterized by comprising the colored glass substrate according to the first aspect.

The glass globe for illumination according to claim 3 of the present invention is characterized by being milky white.

A luminaire according to claim 4 of the present invention provides the lighting glass globe according to claim 2 or claim 3, a light source arranged inside the globe, and power to the light source. It is characterized in that it is provided with a power supply body.

According to a fifth aspect of the present invention, there is provided a method for producing an electrostatic coating film, which comprises a step of forming a powder by mixing glass frit and a pigment, and a water-repellent treatment of the powder to obtain a coating powder. The method is characterized by including a step of forming, a step of attaching the coating powder to a glass substrate by electrostatic coating, and a step of heat-treating the attached coating powder.

The colored glass substrate according to claim 6 of the present invention is characterized in that powder having a silyl group is coated.

The colored glass substrate according to claim 7 of the present invention is characterized in that a glass frit having an average particle diameter of 3 to 30 μm is coated.

In the colored glass substrate according to claim 8 of the present invention, the average particle diameter of the pigment is 1 / the average particle diameter of the glass frit.
It is characterized in that powder of 3 or less is coated. In the colored glass substrate according to claim 9 of the present invention, the glass frit is borosilicate glass or lead glass,
It is characterized in that the pigment is titanium oxide or zirconium oxide.

The powder according to claim 10 of the present invention is characterized in that a silyl group is formed.

[0018]

In the present invention, since the powder material is coated by electrostatic coating, the powder can be coated uniformly regardless of the shape of the coated surface.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 shows a luminaire D for use with a general-purpose light bulb. In FIG. 1, B is a base mounted on the ceiling surface A, etc., and a socket S is attached to the central portion thereof. A light bulb L is attached to the. Further, G is a substantially cylindrical globe made of soda lime glass, and an annular recess R is formed near the opening. Then, a plurality of screws N, N are made to protrude into the recess R of the globe G on the cover portion C which also extends from the peripheral edge of the base B and also serves as a decorative plate, thereby supporting the globe G. Normally, at least three screws N are required at substantially equal intervals in order to stably support the globe G. Further, E is a power supply line for supplying power to the light bulb L via the socket S.

On the inner surface of the globe G, a milky white diffuse coating film G1 for diffusing the light emitted from the light bulb L is formed.

The processing of the material of the milky white diffused coating film G1 and the formation on the globe G are performed as follows.

As the material, 10 wt% of titanium oxide (TiO ₂ ) having an average particle size of about 0.3 μm was added as a pigment to a borosilicate glass frit having an average particle size of about 4 μm, and further 5% by weight was added. Hexamethyldisilane is added and milled in a pot mill for 24 hours, and the milled powder is heated at about 150 ° C for about 1 hour to evaporate and remove unreacted silasan. A powder was obtained.

Such a coating powder has an OH group on the surface of R ₃
Substituted with a Si group (silyl group) (where R is an alkyl group such as a methyl group and an ethyl group) and has no polarity, the powder particles did not adhere to each other, and a powder having very good fluidity was obtained.

Next, the above-mentioned coating powder is coated on the inner surface of the glove G using an electrostatic coating device, and after coating, it is about 1 ° C. at about 600 ° C.
It was heated and baked for a period of time to form a milky white diffused coating film G1. Incidentally, the titanium oxide particles are (TiO ₂ ) 600 ° C.
The light from the light bulb L is refracted in the glass frit which is not melted and is solidified to a certain degree, and the light is emitted in an indefinite direction outside the globe G.

As described above, in electrostatic coating, only powder having good fluidity is sprayed from the coating nozzle.
The powder adheres almost uniformly to the inner surface of the glass globe G, and the silyl groups on the surface of the silylated titanium oxide particles are thermally decomposed during firing to improve the wettability with the glass. The coating film G1 that has been overcoated with frit and has a surface of enamel having a small uneven surface with a small height difference has a high bonding strength with the glass surface and does not peel off. In addition, the film thickness was locally thick and there was no unevenness in the film color, and the pigment was dispersed and buried near the wall surface of the globe G in the glass frit, and the light rays passing through the globe G were soft and calm. It becomes a diffused light and has a milky white diffused coating film G with excellent appearance and quality.
1 was obtained.

In the above description, titanium oxide (TiO ₂ ) was added as a pigment to the borosilicate glass frit, and water-repellent treatment for silylation was performed to obtain a coating powder, but the present invention is not limited to this. It is applicable even when the above materials are not silylated.

Table 1 shows the results of electrostatic coating of the above powder materials treated with water repellency and those not treated with water repellency, and spray coating of the above powder materials dispersed in an organic solvent. The degree of difficulty of electrocoating (the state of clogging of the powder transfer pipe) and the state of the diffused coating film formed are shown in comparison. In the table, ◎ mark is extremely good, ○ mark is good, △
The mark is not so good, and the X mark is bad.

[0029]

[Table 1] From the table above, it is easier to carry out the work without clogging of the transfer pipe by coating the powder that has been subjected to water repellent treatment by silylation by electrostatic coating, and the coated surface also has a uniform film thickness and uniform diffusivity. Glove G having was obtained. On the other hand, if you apply powder that is not water repellent by electrostatic coating,
Although the fluidity of the powder was slightly lowered, there was no clogging of the powder transfer pipe, which particularly hinders the work.

Further, in the case where the paint dispersed in the organic solvent is applied by spraying, the solvent is sprayed together with the powder from the nozzle, so that the powder does not evenly adhere to the inner surface of the globe G and the inner surface of the corner portion is locally covered. The coating film G1 after firing may have an uneven surface with a large height difference on the melted surface after firing, and the coating film G1 may peel off when a glass piece of this convex surface falls later. However, the coating surface had unclear coating unevenness and pinholes, and the quality of the glove G and the appearance were impaired.

In addition, as shown in FIGS. 2 (a) to 2 (f), the lighting fixture has various shapes (a ... spherical shape), (b ... quadrangular shape), (c. Shape), (d ...
There are globes G of (triangular shape), (e ... hemispherical shape), and (f ... rhombus shape), and when several types of globes G are coated with water-repellent powder by electrostatic coating. ,
Quality passing status (yield) in which the coating surface of the diffused coating film G1 was investigated as compared with the case where the organic coating material in which the powder material was dispersed in the organic solvent was applied by spraying and dipping.
Is shown in Table 2. In addition, in the table, the ◎ mark indicates a yield of 90% or more,
Yield is 70-90%, △ is yield 40-70%,
The cross mark represents a yield of less than 40%.

[0032]

[Table 2] When the water-repellent powder was applied by electrostatic coating as shown in the above table, a good coated surface was obtained regardless of the shape of the globe G. Further, even when the powder which is not subjected to the water repellent treatment is applied by electrostatic coating, the occurrence of uneven coating is small, and there is no particular problem in practical use. In addition, when the paint dispersed in the organic solvent is spray-painted, uneven coating occurs, and in the case of cast-in coating, bubbles and uneven flow occur. Particularly, in the case of the angled globe G, the paint accumulates at the corners. There were many defects.

When the powder material thus water-repellent treated is coated on the globe G by electrostatic coating, the globe G having a complicated shape can also be coated, and high quality and high yield production is possible and it is inexpensive. A milky white glove G could be provided.
Further, also in the case of the powder material which is not subjected to the water repellent treatment, the appearance and quality are improved as compared with the coating material dispersed in the organic solvent, and it can be applied within a range where there is no practical problem.

Next, 10 wt% of titanium oxide (TiO ₂ ) was added to a lead type glass frit as a milky white material, and water repellent treatment by silylation similar to that in the above-mentioned example was carried out to produce a coated powder. did. This coating powder was coated on the inner surface of the glove G1 by electrostatic coating and the situation was investigated, but the same results as in Table 1 were confirmed.

Crystallographic examination of this coating film by X-ray diffraction confirmed lead titanate crystals. Since this lead titanate only needs to be generated only at the interface with the glass surface forming the globe, the peel strength of the coating film could be sufficiently improved by the formation of a trace amount.

By the way, JIS (Japanese Industrial Standard) C810
In the impact strength test according to 5, the coating film of the material obtained by adding titanium oxide to the borosilicate glass frit is 0.2
~ 0.35 (N · m = Newton · meter), the coating film of the above-mentioned lead-based glass frit with titanium oxide added is 0.5 to 1.5 (N · m) and has a large peel strength. Was improved.

Further, a borosilicate glass frit having an average particle size of about 4 μm has a pigment content of about 0.
Zirconium oxide (ZrO ₂ ) of 6 μm was added, 5 wt% of hexamethyldisilane was further added, and milling was carried out for 24 hours in a pot mill. The milled powder was heated at about 150 ° C. for about 1 hour, and unreacted. A water repellent treatment for silylation, which evaporates and removes silasan, was performed to obtain a coated powder.

It has been confirmed that such a coating powder also obtains the same operational effects as those of the above-mentioned embodiment.

In the present invention, titanium oxide (TiO ₂ ) or zirconium oxide (Zr), which are pigments, are added to the borosilicate glass frit and the lead glass frit similar to those in the above-mentioned embodiments.
O ₂ ) -added powder material is electrostatically coated on the inner surface of the globe G, and the above-mentioned borosilicate glass frit or lead glass frit is coated on the coated surface. Since it is buried in a portion close to, and only the molten glass frit exists on the surface side, a smooth surface can be obtained.

The average particle size of the glass frit and the pigment is 3 to 30 μm, and the average particle size of the pigment is 1/3 of the average particle size of the glass frit mixed and used.
The following is good. If the average particle size of the glass frit is less than 3 μm, the powder agglomerates and the coating film peels off, which is not preferable, and if it exceeds 30 μm, the surface of the coated surface is not smooth due to the particles, which is not possible. Further, when the average particle size of the pigment is 1/3 or more of the average particle size of the glass frit, the pigment is projected on the surface of the coating film after melting the glass frit and the smoothness is deteriorated. The pigment enters the glass frit layer to improve the smoothness of the coating film surface.

The present invention is not limited to the above-mentioned embodiment, and for example, the globe of the lighting equipment is described in the embodiment, but the glass substrate is a glass plate for windows, glass crafts and ornaments. May be

The material of the glass substrate is not limited to soft glass, but may be hard glass, quartz glass or ceramics. Further, the colored film coated on the surface of the glass substrate is not limited to the milky white light diffusing film, but may be a red colored film obtained by mixing glass frit with copper oxide (Cu ₂ O) as a pigment. A soft, soft shine can be obtained compared to a normal transparent colored film. And
The glass frit and pigment used as materials for this colored film are
It goes without saying that the selection is made according to the coefficient of thermal expansion of the glass substrate.

Furthermore, the coating film on the glass substrate is not limited to one surface such as the inner surface, but may be on the outer surface or both the inner and outer surfaces because the surface is smooth.

Furthermore, the lighting equipment is not limited to the light bulb,
Of course, it can also be applied to instruments using other light sources.

[0045]

As described above in detail, according to the present invention, the powder is suitable for electrostatic coating, and only the powder is sprayed from the coating nozzle during electrostatic coating, which is a glass substrate having a complicated structure. However, the powder material adheres almost uniformly to the substrate surface, and the coating film after firing has smoothness with little unevenness on the surface. For example, in the case of a glove of a lighting fixture, even if dust or the like adheres to the inner surface. It can be easily removed by cleaning, no coating unevenness occurs, and the bonding strength with the glass substrate surface is high and the coating film does not peel off.

Therefore, it is possible to obtain a coating film which is easy to manufacture, has a high yield and high productivity, and which has an excellent appearance and quality.

[Brief description of drawings]

FIG. 1 is a partial sectional front view showing an embodiment of a lighting fixture of the present invention.

2A to 2F are front views showing various gloves of a lighting fixture.

[Explanation of symbols]

 G: Glass substrate (glove) G1: Coating film (milky white diffuser film) D: Lighting fixture L: Light bulb

Claims (10)

[Claims] 1. A colored glass substrate, comprising: a glass substrate; and an electrostatic coating film formed on at least one surface of the glass substrate, the electrostatic coating film being a powder of a mixture of glass frit and a pigment. 2. A glass globe for illumination, wherein the colored glass substrate according to claim 1 is a glass globe. 3. The glass globe for illumination according to claim 2, which is milky white. 4. A glass globe for illumination according to claim 2 or 3, a light source arranged inside the glass globe for illumination, and a power supply for supplying power to the light source. Lighting equipment characterized by being. 5. A step of forming a powder by mixing glass frit and a pigment; a step of forming a coating powder by subjecting the powder to a water repellent treatment; and a glass substrate by electrostatically coating the coating powder. And a step of heat-treating the attached coating powder; a method for producing an electrostatic coating film, comprising: 6. The colored glass substrate according to claim 1, wherein the powder has a silyl group. 7. The colored glass substrate according to claim 1, wherein the glass frit according to claim 1 has an average particle diameter of 3 to 30 μm. 8. A colored glass substrate, wherein the average particle size of the pigment according to claim 1 is 1/3 or less of the average particle size of the glass frit. 9. The colored glass substrate according to claim 1, wherein the glass frit is borosilicate glass or lead glass, and the pigment is titanium oxide or zirconium oxide. 10. A powder comprising a glass frit and a pigment having a silyl group formed on the powder.