JPH03159053A - Scatter preventing fluorescent light - Google Patents

Abstract

PURPOSE:To prevent deterioration of high polymer resin for preventing scatter by forming a specific coat on an outer surface of a glass tube and further forming a transparent coat made of high polymer resin on the former coat. CONSTITUTION:A coat 2 which absorbs ultraviolet rays of 400 nm or less is formed on an outer face of a glass tube 1, and further on the coat 2, a transparent coat 3 made of high polymer resin is formed. By thus forming the coat 2 which absorbs ultraviolet rays of 400nm or less on the outer face of the glass tube 1, the high polymer transparent resin coat 3 adhered on it can prevent deterioration due to ultraviolet rays of 400nm or less radiated from a fluorescent light whereby scatter of glass pieces can be prevented even if the fluorescent light is accidentally broken.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a novel shatterproof fluorescent lamp.

Since conventional fluorescent lamps use glass tubes, if the glass tubes are damaged due to improper handling, glass fragments may fly off and cause personal injury. As a method for dealing with this, a shatterproof type fluorescent lamp is 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 shatterproof fluorescent 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 the process of manually covering the completed fluorescent lamp with the tube is extremely inefficient.For this reason, shatterproof fluorescent lamps are not commonly used. There was a problem in that they were extremely expensive compared to shaped fluorescent lamps.

Therefore, the inventors first used, for example, an organic solvent-soluble polyester polyol-based urethane resin, a resin whose main component is a polyurethane water dispersion in which a urethane elastomer with a crosslinked structure is dispersed in water, etc. We proposed an anti-scattering fluorescent lamp, which makes it extremely easy to form a transparent anti-scattering film and can significantly reduce costs compared to conventional lamps.However, as a result of further studies on high-load fluorescent lamps, we found that the above-mentioned 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 resins, and as this reaction progresses, polymer crosslinking occurs. It has become clear that the tensile strength and elongation rate decrease due to repeated cutting, and that the resin turns yellow.

The present invention has been made to solve the above-mentioned problems, and it is easier to form a film than before, has good workability, and is effective in preventing deterioration of the anti-scattering polymer resin. The present invention provides a shatterproof fluorescent lamp.

Means for Solving the Problems To achieve this object, the shatterproof fluorescent lamp of the present invention has a coating that absorbs ultraviolet rays of 400 nm or less formed on the outer surface of the glass tube, and a coating made of polymer resin on the coating. It has a structure in which a transparent film is 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,
Even if a fluorescent lamp is accidentally damaged, glass pieces can be prevented from scattering.

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 30-watt annular fluorescent lamp held horizontally in this solution, it was taken out and the temperature was 70°C and the wind speed was 5m/s.
By drying with EC warm air, the 1st R! ! As shown in J, a transparent ultraviolet absorbing film [2] made of zinc oxide was formed on the outer surface of the glass tube 1 to a thickness of 10 μm. Next, the fluorescent lamp held horizontally was immersed in a solution of 1,500 ml of polyurethane aqueous dispersion (Superflex 10107, manufactured by Dai-Kogyo Seiyaku Co., Ltd.), and then pulled out and brought to a temperature of 1.
A transparent film 3 made of polyurethane resin was formed on the ultraviolet absorbing film [12] to a thickness of 80 μm to obtain a shatterproof fluorescent lamp. In addition, in FIG. 1, 4 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 were no scattered objects. 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 5000 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 formed on the outer surface of the glass tube 1 without having the abrasive ultraviolet absorbing film 11I2, it was observed that the fluorescent lamp turned yellow after being lit for 1000 hours.

Further, according to this embodiment, the glass tube 1 has a two-layer structure in which an ultraviolet absorbing coating 2 is formed on the outer surface of the glass tube 1, and a coating 3 made of a transparent polyurethane resin is further formed on the coating. Compared to conventional products using polyester resin tubes, the cost can be significantly reduced to 215 or less.

DETAILED DESCRIPTION OF THE INVENTION As described above, the present invention provides 400 mm on the outer surface of a glass tube.
By forming a coating that absorbs ultraviolet rays of nm or less and further forming a transparent coating made of polymer resin on the coating, it is much easier to form a shatterproof coating on a glass tube than in the past. To provide a shatterproof fluorescent lamp which can not only significantly reduce lamp cost compared to conventional lamps because the material cost is low, but also can prevent deterioration of the shatterproof polymer resin. It is something that can be done.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a shatterproof fluorescent lamp according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Glass tube, 2... Ultraviolet absorption coating, 3... Polymer resin coating, 4... Fluorescent material film.

Claims (1)

[Claims] A shatterproof fluorescent lamp characterized in that a coating that absorbs ultraviolet rays of 400 nm or less is formed on the outer surface of a glass tube, and a transparent coating made of a polymer resin is further formed on the coating.