JP2746704B2 - Shatterproof fluorescent lamp - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a novel shatterproof fluorescent lamp.

2. Description of the Related Art Since a fluorescent lamp uses a glass tube, if the glass tube is damaged by mistake in handling, a piece of glass may be scattered and cause personal injury. As a way to deal with this,
As a fluorescent lamp, a shatterproof fluorescent lamp in which the outer surface of a glass tube is covered with a transparent tube made of a polymer resin such as a polyester resin is known. In this method, a heat-shrinkable polyester resin tube is covered with a glass tube, and then the tube is heated to form a polymer resin film on the outer surface of the glass tube.

Problems to be Solved by the Invention In a conventional shatterproof fluorescent lamp, a tube made of a polyester resin is used as described above in consideration of weather resistance, film strength and the like.

However, this tube is extremely expensive due to the difficulty of processing, and it is indispensable in the extremely poor workability of manually putting the tube on the completed fluorescent lamp. There is a problem in that it becomes extremely expensive as compared with a shaped fluorescent lamp.

Therefore, the present inventors previously used, for example, an organic solvent-soluble polyester polyol-based urethane resin, a resin having a polyurethane aqueous dispersion obtained by dispersing a urethane elastomer having a processed structure in water as a main component, and the like. The formation of a scatter-preventing coating film was extremely easy, and we proposed a scatter-prevention fluorescent lamp that can significantly reduce the cost compared to conventional ones. There has been a problem that the deterioration of the resin film significantly progresses.

In this regard, the inventors have conducted intensive studies, and as a result, free radicals are generated in a polymer forming a polymer transparent resin by ultraviolet light of 400 nm or less emitted from a fluorescent lamp and ultraviolet light from the outside of the fluorescent lamp. As the reaction progressed, it became clear that the polymer cross-links were cut one after another, and the tensile strength and elongation decreased, and the resin was colored yellow.

The present invention has been made in order to solve the above-described problems, and it is easier to form a film than before, and has good workability, and can prevent the deterioration of the polymer resin for scattering prevention. An object of the present invention is to provide a shatterproof fluorescent lamp.

Means for Solving the ProblemsIn order to achieve this object, the shatterproof fluorescent lamp of the present invention has a coating that absorbs ultraviolet light of 400 nm or less on the outer surface of a glass tube, a transparent coating made of a polymer resin, and a coating of 400 nm. It has a configuration in which the following ultraviolet absorbing films are sequentially formed.

According to the present invention, by forming a coating that absorbs ultraviolet light of 400 nm or less as a first layer and a third layer on the outer surface of a glass tube, a second layer is formed between the first layer coating and the third layer coating. As a transparent resin coating of a polymer to be applied as a UV light of 400 nm or less emitted from a fluorescent lamp and 4 from the outside of the fluorescent lamp
Since the deterioration due to the ultraviolet ray of 00 nm or less can be prevented, even if the glass tube is broken by mistake, scattering of the glass piece can be prevented.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

An organic solvent type zinc oxide solution was used as the ultraviolet absorbing film. A ring-shaped 30 watt fluorescent lamp held horizontally was immersed in this solution, then pulled up and dried with hot air at a temperature of 70 ° C and a wind speed of 5 m / sec. Thereby, as shown in FIG. 1, a transparent first ultraviolet absorbing film 2 made of zinc oxide is formed on the outer surface of the glass tube 1 to a thickness of 10 μm. Then, the fluorescent lamp held horizontally was immersed in 1500 gr of a polyurethane water dispersion (manufactured by Daiichi Kogyo Seiyaku Co., Ltd .: Superflex 107), and then raised, the temperature was raised to 100 ° C. and the wind speed was 5 m / se.
After drying with the warm air of c, a transparent coating 3 made of polyurethane resin is formed on the ultraviolet absorbing coating 2 to a thickness of 80 μm. Then, a scattering prevention fluorescent lamp was obtained by forming a second ultraviolet absorbing film 4 on the transparent film 3 made of the polyurethane resin by the same operation as the ultraviolet absorbing film. In FIG. 1, reference numeral 5 denotes a phosphor film.

Using the fluorescent lamp thus obtained, the following drop strength test was performed. First, keep the fluorescent light level, 3m
When dropped naturally from the height of the glass tube, the glass tube was broken, but the coating was not damaged, and the glass pieces were firmly attached to this coating, so the glass pieces were protected by the coating There was nothing flying. next,
200gr attached to the end of 1m length yarn as impact test
When the steel ball of No. was exposed to a fluorescent lamp at an angle of 30 degrees from the vertical, the coating was not damaged at all.

Further, when the lamp was turned on for 5000 hours as a life test, it was confirmed that the fluorescent lamp according to the present invention was not colored yellow and had no problem. However, in a fluorescent lamp in which either or both of the first and second ultraviolet absorbing coatings are not provided and the transparent coating 3 is simply formed on the outer surface of the glass tube 1, 1000
It was recognized that the color turned yellow upon lighting for hours.

Further, according to the present embodiment, a first ultraviolet absorbing coating 2 is formed on the outer surface of the glass tube 1, a coating 3 made of a transparent polyurethane resin is formed on the coating, and Has a three-layer structure in which a second ultraviolet absorbing film 4 is formed, but the cost can be greatly reduced to 1/2 or less as compared with the conventional one using a polyester resin tube.

Advantageous Effects of the Invention As described above, the present invention provides an outer surface of a glass tube,
By forming a first UV-absorbing film that absorbs UV light of 400 nm or less, a transparent and film made of a polymer resin, and a second UV-absorbing film that absorbs UV light of 400 nm or less in order, In addition, the formation of the shatterproof coating on the glass tube becomes extremely easy, and the material cost is low, so that the cost can be significantly reduced as compared with the conventional ones. It is possible to provide a shatterproof fluorescent lamp capable of preventing deterioration of the fluorescent lamp.

[Brief description of the drawings]

FIG. 1 is a sectional view of a shatterproof fluorescent lamp according to an embodiment of the present invention. 1 ... Glass tube, 2 ... First ultraviolet absorbing coating, 3 ...
Polymer resin coating, 4 ... second UV absorbing coating, 5 ...
Phosphor film.

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Claims (1)

(57) [Claims] 1. An outer surface of a glass tube, comprising a first ultraviolet absorbing film absorbing ultraviolet light of 400 nm or less, a transparent film made of a polymer resin, and a second ultraviolet absorbing film absorbing ultraviolet light of 400 nm or less. Scattered-type fluorescent lamps characterized by sequentially forming.