JP2000106151A - Tubular bulb - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tubular bulb which uses an adhesive agent capable of easily adapting to the environment. SOLUTION: A tubular bulb is provided with a glass bulb 10, a base 20 provided in the glass bulb, an adhesive agent 30 for fixing the glass bulb and the base 20 to each other, and water-repellent silicone which is added to the adhesive agent and capable of being dissolved in the alcohol group solvent. In this tubular bulb, as the water-repellent silicone, methylhydrogen siloxane is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to lamps such as electric bulbs, fluorescent lamps and high-intensity discharge lamps, and more particularly to an adhesive used for such lamps.

[0002]

2. Description of the Related Art Conventionally, aluminum is generally used for the base of these lamps, and as an adhesive for bonding the base and the glass bulb, inexpensive and durable stone powder, shellac, phenol resin or the like is a main component. A so-called phenolic adhesive is used.

[0003] In recent years, the size of the bulb has been further reduced and the wattage has been further increased. Furthermore, the operating environment has been diversified, such as being used not only in general indoors, but also in bathrooms and outdoor enclosed lighting fixtures where the humidity is high. ing. The properties required for these die adhesives are roughly as follows.

[0004] 1. Heat resistance to "temperature rise in the base" due to heat radiation of the lamp is maintained until the end of its life.

[0005] 2. Excellent resistance to minute amounts of ultraviolet rays emitted from lamps.

[0006] 3. Excellent water repellency against long-term storage and moisture.

[0007] 4. Excellent workability in the lamp manufacturing process (for example, a high-speed machine with an index of 1 second or less).

[0008] In particular, in item 1, in addition to heat resistance, in many cases in recent years, voltage is narrowed down and used for a long time (for example, 1.5 times the rated life) in various usage conditions in recent years.
Therefore, as a new evaluation item in JIS, the torque strength after 1.5 times the rated life in an electric furnace at 165 ° C. is standardized (2.5 N · m or more), and a wide temperature range: a high operating temperature ( (For example, 215 ° C.) to normal operating temperature (for example, 18
Materials that are durable from 5 ° C) to low operating temperatures (165 ° C) are needed. Furthermore, water repellency becomes important.

[0009]

However, as a conventional water repellent silicone, methyl hydrogen siloxane soluble in toluene has been used. The disadvantage of these water-repellent silicones is that harmful toluene, xylene, and the like are used as solvents, and an immediate environmental replacement is required.

To cope with this, it is conceivable to make the solvent system soluble in an alcohol (eg, ethanol) solvent and to reconsider the specifications of the silicone itself. At this time, it is necessary to consider gas generation due to the reaction between the silicone and the alcohol.

An object of the present invention is to provide a bulb using an adhesive which is easily adapted to the environment.

[0012]

According to the first aspect of the present invention, there is provided a glass bulb, a base provided on the glass bulb, an adhesive for fixing the glass bulb and the base, and an alcohol-based solvent added to the adhesive. And a water-repellent silicone that is soluble in water.

According to a second aspect of the present invention, in the tube according to the first aspect, the water-repellent silicone is methyl hydrogen siloxane.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a tube and a method of manufacturing the same according to an embodiment of the present invention.

FIG. 1 is a partially sectional side view of a tube showing one embodiment of the present invention. In the figure, a lamp, for example, an incandescent light bulb, has a glass bulb 10, a screw groove 24 on the outer surface, and a contact formed on a top portion.
Base 20 provided on neck 11 of glass bulb 10
And an adhesive 30 for fixing the glass bulb 10 and the base 20, for example, a cement and an adhesive. In addition, the bulb has a filament 23 and a stem 22 that holds the filament 23 via an internal lead.

Next, in this embodiment, the results of experiments on cement produced and used and test results on lamps will be described.

First, the solvent is soluble in an alcohol-based (eg, ethanol) solvent, and the specification of the silicone itself is water-repellent silicone, that is, methyl hydrogen siloxane. The test was performed on a sample in which generation of hydrogen) was stopped and methanol was generated.

For reference, the amount of generated methanol is 0.01 vol% or less at room temperature, and the explosion limit area is 7.3 to less.
This is well below 36%, suggesting that there is almost no danger of explosion.

The specifications of the cement 30 include a phenol resin, a curing agent solution at 19.95%, and a stone powder at 80.00%.
And 0.05% of water repellent silicone. Then, several kinds of basic tests described below were performed as a test for simulating the adhesive strength of the lamp using the paste-form cement.

FIG. 2 is a perspective view showing a glass test piece in which an adhesive equivalent to that used for a tube according to an embodiment of the present invention is interposed.

1. Initial Hardenability Test This test was performed using two glass test pieces 40 (size 1).
0 * 20 * 1 (mm)) with the cement 30 interposed and superimposed, bonded as shown in FIG. 2 and fired in an electric furnace at 180 ° C. for 1, 2, 5, 10 minutes, and then bonded. It measures the change in intensity.

2. Heat resistance evaluation test This test was performed using two glass test pieces 40 (size 1).
0 * 20 * 1 (mm)), and the cement 30 is interposed between them. The cement 30 is adhered as shown in FIG. 2 and fired in an electric furnace at 180 ° C. for 10 minutes. 21
The adhesive strength is measured by continuously charging each electric furnace at 5 ° C., 185 ° C., and 165 ° C.

3. UV resistance test This test was performed by bonding a glass test piece 40 (size 10 * 20 * 1 (mm)) to the germicidal lamp GL15,
After curing at 80 ° C. for 10 minutes, the cement 30 is irradiated with ultraviolet light emitted from the lamp so that the lamp is subjected to a life test, and the residual ratio of the test piece to a load of 500 g at each life time is measured.

4. Water repellency test This test was performed on a glass test piece 40 (size 10 * 2
0 * 1 (mm)) with cement 30 interposed and superimposed, bonded as shown in FIG. 2, fired in an electric furnace at 180 ° C. for 10 minutes, boiled in hot water for 1 hour, and bonded It measures the change in intensity.

The results of these experiments are shown in FIG.
FIG. 4 shows the results of an actual lamp test performed on these specifications.
Shown in

FIG. 3 is a view showing the results of an experiment using a glass test piece in which an adhesive equivalent to that used for a tube according to an embodiment of the present invention is interposed.

FIG. 4 is a diagram showing the results of a lamp test using a lamp in which an adhesive equivalent to that used for a lamp bulb according to an embodiment of the present invention is interposed.

According to the figure, in each test, the cement of the present embodiment clearly shows an improvement effect,
In the boiling test 3N and the heat resistance test, which are JIS standards, the life end is 3N · m and the rated life is 165 ° C (10
00 hours) and 1.5 times (1500 hours) later.
In addition to satisfying 5 Nm, a water repellency test using a lamp (similar water repellency test is performed after cementing to a base).
In this case, the properties are equal to or higher than those of the cement using the current water-repellent silicone. By the way, when the water-repellent silicone is pulled out according to other specifications, the water-repellency is reduced to half. Furthermore, there was no problem with the initial curability as a result of the torque intensity measurement in the initial ramp torque test.

[0029]

According to the first and second aspects of the present invention, it is possible to obtain an adhesive having a sufficient adhesive strength and to obtain a tube suitable for an environment in which harmful toluene or xylene is not used as a solvent. .

[Brief description of the drawings]

FIG. 1 is a partially sectional side view of a tube showing one embodiment of the present invention.

FIG. 2 is a perspective view showing a glass test piece in which an adhesive equivalent to that used for a tube according to an embodiment of the present invention is interposed.

FIG. 3 is a view showing an experimental result using a test piece.

FIG. 4 is a view similarly showing a lamp test result.

[Explanation of symbols]

 10: glass bulb 20: base 30: adhesive

Claims (2)

[Claims] A glass bulb; a base provided on the glass bulb; an adhesive for fixing the glass bulb and the base; and a water-repellent silicone added to the adhesive and soluble in an alcohol-based solvent. A tube characterized by being made. 2. The bulb according to claim 1, wherein the water-repellent silicone is methyl hydrogen siloxane.