JPH03159055A - Scatter preventing fluorescent light - Google Patents

Abstract

PURPOSE:To improve an effect for preventing scatter and prevent deterioration in brightness due to contamination such as dust by sequentially forming a specific coat, a high polymer transparent resin coat and a transparent coat of one or two or more kinds of inorganic systems on an outer face of a glass tube. CONSTITUTION:By forming a coat 2 which absorbs ultraviolet rays of 400nm or less on an outer face of a glass tube 1, a high polymer transparent resin coat 3 to be adhered on it prevents deterioration due to ultraviolet rays of 400nm or less radiated from a fluorescent light. In addition by forming an inorganic transparent coat 4 on the high polymer transparent resin coat 3, pin holes on the surface of the high polymer resin coat 3 are buried to be flat. Thus deterioration of scatter preventing resin 3 is prevented as well as dust on the fluorescent light can be wiped off with a cloth so as to prevent deterioration in lamp light beams.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a novel anti-scattering light lamp.

Since conventional fluorescent lamps use glass tubes, if the glass tubes are damaged due to incorrect handling, glass fragments may fly off and cause personal injury. As a way to deal with this,
As for fluorescent lamps, shatterproof light lamps are known in which the outer surface of a glass tube is covered with a transparent tube made of a polymer resin such as polyester resin. This is a method in which a glass tube is covered with a heat-shrinkable polyester resin tube, and then the tube is heat-treated to form a polymer resin coating on the outer surface of the glass tube.

Problems to be Solved by the Invention In conventional anti-scattering light lamps, tubes made of polyester resin are used in consideration of weather resistance, film strength, etc., as described above.

However, this tube is extremely expensive due to the difficulty of processing it, and it requires an extremely inefficient process of manually covering the finished fluorescent lamp with a duplex. There was a problem in that they were extremely expensive compared to general fluorescent lamps.

Therefore, the inventors first developed a transparent material by using, for example, an organic solvent-soluble polyester polyol-based urethane resin, a resin whose main component is a polyurethane aqueous dispersion in which a urethane elastomer with a crosslinked structure is dispersed in water, etc. We have proposed an anti-scattering light lamp that makes it extremely easy to form a shatter-preventing coating and can significantly reduce costs compared to conventional methods. A problem has arisen in that the deterioration of the polymer resin coating progresses significantly.

As a result of intensive research by the inventors, we found that ultraviolet rays of 400 nm or less emitted from fluorescent lamps generate free radicals in the polymers that form transparent polymer resin, and as this reaction progresses, polymer crosslinking occurs. It became clear that the resin was broken one after another, resulting in a decrease in tensile strength and elongation, and the resin was colored yellow.

In addition, a detailed examination of the surface of the polymer resin coating revealed that there were countless fine pinholes, and if dust got into them, it could not be removed even by wiping, reducing the brightness of fluorescent lights. has arisen.

The present invention has been made to solve the above problems, and it is easier to form a film than before, has good workability, has an excellent scattering prevention effect, and reduces brightness due to dirt such as dust. To provide a shatterproof fluorescent lamp that does not cause any damage.

Means for Solving the Problems To achieve this object, the shatterproof fluorescent lamp of the present invention includes a coating that absorbs ultraviolet rays of 400 nm or less, a transparent polymeric resin coating, and an inorganic coating on the outer surface of the glass tube. It has a structure in which a transparent film and a transparent film are sequentially formed.

According to the present invention, by forming a coating on the outer surface of the glass tube that absorbs ultraviolet rays of 400 nm or less, the transparent polymeric resin coating applied thereon can absorb ultraviolet rays of 400 nm or less emitted from fluorescent lamps. Because deterioration can be prevented,
It is possible to prevent glass pieces from scattering. Furthermore, by forming an inorganic transparent coating on top of the polymeric transparent resin coating, the pinholes on the surface of the polymeric resin coating are filled in, making it easy to use, so even if you wipe the lump with a cloth, it won't get dirty. Therefore, there is no decrease in the luminous flux of fluorescent lamps.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

An organic solvent-based zinc oxide solution is used as the ultraviolet absorbing film.
After immersing a circular 30 watt fluorescent lamp held horizontally in this solution, it was pulled out and the temperature was 70°C and the wind speed was 5 m/s.
By drying with warm air of ee, a transparent ultraviolet absorbing coating 2 made of zinc oxide is formed on the outer surface of the glass tube 1 to a thickness of 10 μm. Then, polyurethane water dispersion 1500
After immersing the fluorescent lamp held horizontally in the gr solution,
This is pulled up and dried with hot air at a temperature of 100° C. and a wind speed of 5 m/see to form a transparent coating 3 made of polyurethane resin on the ultraviolet absorbing coating 2 to a thickness of 100 μm. Next, using a 2% solution of tetrabutyl titanate, the fluorescent lamp held horizontally is immersed in this solution, then taken out and air-dried, and titanium oxide is deposited on the transparent coating 3 made of the polyurethane resin. A shatterproof fluorescent lamp was obtained by forming a transparent inorganic coating 4 of 5 μm in thickness.

On the other hand, an organic solvent-based zinc oxide solution was used as the ultraviolet absorbing film, and after immersing a 30-watt annular fluorescent lamp held horizontally in this solution, it was pulled up and exposed to hot air at a temperature of 70°C and a wind speed of 5 m/see. As shown in FIG. 1, a transparent ultraviolet absorbing coating 2 made of zinc oxide is formed on the outer surface of the glass tube 1 to a thickness of 10 μm. Then,
After immersing the fluorescent lamp held horizontally in 1500 g of polyurethane aqueous dispersion, it was pulled up and dried with warm air at a temperature of 100°C and a wind speed of 5 m/see, and the polyurethane resin was placed on the ultraviolet absorbing I2. A transparent coating 3 of 100 μm in thickness is formed. Next, the fluorescent lamp held horizontally was immersed in a mixture of a 2% solution of tetrabutyl titanate and a 2% solution of di-n-butyltin maleate in a ratio of 1:1, and then pulled out. A shatter-proof fluorescent lamp is formed by drying at an ambient temperature of 60° C. with no wind and forming a transparent film 4 made of titanium oxide and tin oxide to a thickness of 5 μm on the transparent film 3 made of the polyurethane resin. Obtained. In addition, the first
In the figure, 5 indicates a phosphor film.

Using the thus obtained fluorescent lamp, the following drop strength test was conducted. First, keep the fluorescent light horizontal and
When this object was allowed to fall naturally from a height of There was nothing to scatter. next,
20 attached to the end of a 1 m long thread for impact resistance testing.
When a 0gr steel ball was exposed to a fluorescent lamp at an angle of 30 degrees from the vertical line, the coating was not damaged at all.

Furthermore, when the lamp was lit for 5,000 hours as a life test, the fluorescent lamp according to the present invention did not turn yellow and was found to have no problems. However, in a fluorescent lamp in which the transparent coating 3 was simply formed on the outer surface of the glass tube 1 without having such an ultraviolet absorbing coating 2, it was observed that the fluorescent lamp turned yellow after being lit for 1000 hours.

On the other hand, a fluorescent lamp that had been lit for 5,000 hours and had a lump on it was wiped off with a wet cloth, but the polymer resin coating was not stained.

Further, according to this embodiment, an ultraviolet absorbing coating 2 is formed on the outer surface of the glass tube 1, and then a coating 3 made of transparent polyurethane resin is formed on the coating, and then one or more types of Although it has a three-layer structure in which two or more kinds of inorganic transparent coatings 4 are formed, the cost can be significantly reduced to 1/2 or less compared to the conventional method using a polyester resin tube.

DETAILED DESCRIPTION OF THE INVENTION As described above, the present invention provides a glass tube with 40
By sequentially forming a coating that absorbs ultraviolet rays of 0 nm or less, a transparent coating made of polymer resin, and 181 or two or more types of inorganic transparent coatings, compared to conventional methods,
It is extremely easy to form a shatterproof coating on glass tubes,
In addition, since the material cost is low, it is not only possible to significantly reduce the cost compared to conventional methods, but also to prevent the deterioration of the scattering prevention polymer resin, and to prevent dust from accumulating on the fluorescent lamp. It is possible to provide a shatterproof water fluorescent lamp that does not enter the polymer resin even when wiped off and does not reduce the luminous flux of the lamp.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a shatterproof fluorescent lamp according to an embodiment of the present invention. ■...Glass tube, 2...Ultraviolet absorption coating, 3...Polymer resin coating, 4...1
Species or two or more types of inorganic coatings, 5...Fluorescent lamp coatings.

Claims (1)

[Claims] An anti-scattering fluorescent film characterized in that a coating that absorbs ultraviolet rays of 400 nm or less, a transparent polymeric resin coating, and one or more inorganic transparent coatings are sequentially formed on the outer surface of a glass tube. light.