KR20110119630A - Metal halide lamp - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal halide lamp, comprising a pair of electrodes for discharge (121, 122) in the axial direction in an airtight container (11) having a discharge space (10) made of ultraviolet-permeable quartz glass. And a metal halide that emits 350-380 nm ultraviolet light by enclosing an enclosure composed of thallium and halogen which emits an appropriate amount of ultraviolet light with a sufficient amount of rare gas and mercury to maintain the arc discharge state in the discharge space. By constructing a lamp and irradiating the ultraviolet-ray from this metal halide lamp to the ultraviolet curable resin composition containing a photoinitiator, it became possible to improve the hardening rate of the said resin composition.

Description

Metal halide lamp {METAL HALIDE LAMP}

The present invention relates to a metal halide lamp used to operate at a high luminous efficiency for a photoinitiator having an absorption wavelength range in a specific section, and more particularly, to obtain a high light quantity by increasing the luminous efficiency of ultraviolet light of a specific wavelength, the photoinitiator contains It is related with the metal halide lamp which accelerated the hardening rate of the ultraviolet curable resin composition.

A device disclosed in Japanese Patent Application Laid-Open No. 2007-525540 is known as an apparatus that contains a photoinitiator in a resin composition that is curable in an absorption wavelength region of a specific section using ultraviolet rays emitted from an ultraviolet lamp and promotes curing of the composition.

In the technique described in this publication, an iron-based metal halide lamp is used as a light source for irradiating ultraviolet light to a photoinitiator having an absorption wavelength range in a long wavelength ultraviolet ray of 350 to 380 nm. The lamp has a wide wavelength region between 350 and 380 nm, but the light amount of the short wavelength is not very high, and there is a problem that time is required for curing.

Japanese Patent Publication No. 2007-525540

An object of the present invention is to provide a metal halide lamp capable of increasing the luminous efficiency of ultraviolet light of a specific wavelength, obtaining a high light quantity, and increasing the curing rate of the ultraviolet curable resin composition containing the photoinitiator.

A metal halide lamp of one embodiment of the present invention is a metal halide lamp that irradiates ultraviolet rays to an ultraviolet curable resin composition containing a photoinitiator having an absorption wavelength range in a long wavelength ultraviolet ray of at least 350 to 380 nm, which is an airtight container made of an ultraviolet transmissive material. And a discharge electrode made of a pair of refractory metals sealed in the hermetic container and sealed in an hermetic container including argon gas, mercury, and thallium halide.

According to the metal halide lamp of the present invention, when irradiated with a photoinitiator having an absorption wavelength range between 350 and 380 nm, the luminous efficiency can be improved as compared with the case of irradiating ultraviolet rays using a conventional iron-based metal halide lamp. It becomes possible to improve the hardening speed of curable resin composition containing a photoinitiator.

1 is a basic structural diagram for explaining an embodiment of a metal halide lamp of the present invention;
2 is an enlarged view of a portion of FIG. 1;
3 is an explanatory diagram for explaining respective absorption rates with respect to emission wavelengths of different photoinitiators;
4 is an explanatory diagram for explaining Example 1 of the present invention and conventional spectral distribution and light quantity;
5 is an explanatory view showing an enlarged view of FIG.
6 is an explanatory diagram for explaining the effect of Example 1 of the present invention and the conventional photoinitiator,
7 is an explanatory diagram for explaining the relationship between spectroscopy and illuminance in the axial direction of a thallium-based metal halide lamp when the thallium iodide inclusion amount is 0.040 mg / cc;
FIG. 8 is an explanatory diagram for explaining the relationship between spectroscopy and illuminance in the axial direction of a thallium-based metal halide lamp when thallium iodide loading is 0.036 mg / cc;
9 is an explanatory diagram for explaining the amount of thallium iodide loading and the curing ratio of the photoinitiator 4,4'-bis (diethylamino) benzophenone;
It is explanatory drawing for demonstrating the quality of the thallium iodide loading amount and the hardening ratio of the photoinitiator 4,4'-bis (diethylamino) benzophenone.

EMBODIMENT OF THE INVENTION Hereinafter, the best form for implementing this invention is demonstrated in detail, referring drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The basic structural figure for demonstrating one Embodiment which concerns on the metal halide lamp of this invention, and FIG. 2 is a block diagram which expands and shows a part of FIG.

In FIGS. 1 and 2, electrodes 121 and 122 formed of, for example, tungsten material are spaced in both ends of the longitudinal direction of the airtight container 11 in which the discharge space 10 is formed of quartz glass having ultraviolet ray permeability. Are placed. The electrodes 121 and 122 are respectively welded to one end of molybdenum metal foils 141 and 142 via inner leads 131 and 132, respectively. One end of an outer lead (not shown) is welded to the other end of the metal foils 141 and 142. Portions of the metal foils 141 and 142 of the airtight container 11 are sealed by heating the corresponding airtight container 11 from the inner leads 131 and 132 to one end of the outer lead.

The metal foils 141 and 142 may be any materials as long as they are close to the thermal expansion coefficient of the quartz glass forming the hermetic container 11, but general molybdenum is used here as suitable for this condition.

The outer leads, each of which is connected to the metal foils 141 and 142, respectively, are electrically connected to the lead wires 161 and 162 inside the sockets 151 and 152 made of, for example, ceramics having heat resistance and insulation properties. have. The sockets 151 and 152 insulate and seal the lead wires 161 and 162. A power supply circuit (not shown) is connected to the lead wires 161 and 162.

The hermetic container 11 is filled with 1.3 kPa of argon gas necessary for maintaining arc discharge as an encapsulation material, and iron, Hg (mercury), and the like, which are metals for emitting ultraviolet light, are encapsulated.

The metal halide lamp configured as described above can be irradiated with ultraviolet rays by iron, which is a light emitting metal having spectral characteristics in the ultraviolet region. The ultraviolet curable resin composition to which this ultraviolet-ray is irradiated contains the photoinitiator which irradiates the said ultraviolet-ray and starts superposition | polymerization of polymeric resin of the said resin composition.

As a photoinitiator, (a) 4,4'-bis (diethylamino) benzophenone, (b) 4-diethylamino acetphenone, (c) 4-dimethylamino acetphenone, (d) benzyl, (e) thi Oxanthone, (f) benzophenone, (g) 4,4'-bis (diethylamino) benzophenone, etc. can be considered.

FIG. 3: is explanatory drawing for demonstrating each absorption factor with respect to the emission wavelength of each photoinitiator (a)-(g). In the photoinitiators of (a) to (g), photoinitiators (a) and (g) having a high absorption rate with respect to the emission wavelength are used in the wavelength range of at least 350 to 380 nm.

Hereinafter, in the lamp composed of a single tube having an outer diameter φ of the airtight container 11 having a diameter of 27.5 mm, a thickness m of 1.5 mm, and a light emitting length L of 1000 mm of a light emission length, Compared to the lamp using iron and the embodiment of the present invention in which thallium is encapsulated as a light emitting metal, the present invention generates ultraviolet light for accelerating the polymerization rate of the photoinitiator having an absorption wavelength range at a long wavelength ultraviolet light of at least 350 to 380 nm. An embodiment of the will be described.

In addition, as a photoinitiator in each following example, the 4,4'-bis (diethylamino) benzophenone of (a) is compared with the conventional case which irradiated the ultraviolet-ray of an iron type metal halide lamp.

(Example 1) In Example 1, the thallium-based metal in which argon gas required for maintaining arc discharge as an encapsulation in the hermetic container 11 is 1.3 kPa, mercury, and thallium iodide, which is a metal for emitting ultraviolet light, is encapsulated. Produced a halide lamp.

Ultraviolet light by this thallium-based metal halide lamp and ultraviolet light by iron-based metal halide lamp in which iron is sealed as a metal for emitting ultraviolet light are 4,4'-bis (diethylamino) benzo, which is a photoinitiator contained in the curable resin composition. Describe the effect on phenones.

Here, a case where a thallium-based metal halide lamp and an iron-based metal halide lamp are irradiated with ultraviolet rays with the same specifications of input power 12000W, lamp voltage 1100V and lamp current 10.9A, respectively. Fig. 4 shows the spectral distribution and light amount of each of the thallium-based metal halide lamp and the iron-based metal halide lamp of the present invention. As apparent from FIG. 4, the long wavelength ultraviolet ray of 350 to 380 nm required for curing the photoinitiator contained in the resin composition is excellent in a thallium-based metal halide lamp.

FIG. 5 shows only the absorption rate of the photoinitiator (a) 4,4′-bis (diethylamino) benzophenone of FIG.

When the emission spectral curve of the metal halide lamp is α (λ) and the absorption spectral curve of the photoinitiator is φ (λ), the reaction of the used lamp and the photoinitiator is represented by the following equation. In addition, as shown in FIG. 5, a represents a wavelength with a low emission spectrum, and b shows a wavelength with a high emission spectrum.

Here, the ratio of the starting effect by the photoinitiator of the thallium-based metal halide lamp and the iron-based metal halide lamp when the wavelength (a) of the emission spectrum was 350 nm and the wavelength (b) 380 nm was compared. Was obtained.

That is, when the iron-based metal halide lamp was 100%, the thallium-based metal halide lamp was 112%. This indicates that when the curable resin composition containing the photoinitiator 4,4'-bis (diethylamino) benzophenone was irradiated with ultraviolet rays of a thallium-based metal halide lamp, the curing rate was improved by 12%.

In this embodiment, when the ultraviolet ray of the thallium-based metal halide lamp is irradiated with a photoinitiator having an absorption wavelength range between 350 and 380 nm, the luminous efficiency can be increased compared to the case where the conventional ultraviolet ray of the iron-based metal halide lamp is irradiated with the photoinitiator. It became possible to improve the hardening speed of a resin composition. In Example 1, although the lamp which enclosed thallium iodide was demonstrated as an example, it is not limited to iodide, The same effect is acquired even if it encapsulates as another halide. That is, it is good to enclose it as a compound which thallium easily evaporates in an airtight container during arc discharge.

(Example 2) Next, Example 2 of this invention is described with reference to FIG. 7, FIG. 7 and 8 show results obtained by measuring the relationship between spectral and illuminance left and right in the axial direction of the metal halide lamp when the amount of thallium iodide encapsulation is different in the lamp when the emission length is 1000 mm. It is shown. 7 shows the case where thallium iodide loading is 0.040 mg / cc, and FIG. 8 shows the case where thallium iodide loading is 0.036 mg / cc.

When ultraviolet ray is irradiated when the thallium iodide inclusion amount of FIG. 7 is 0.040 mg / cc, separate light emission occurs in the axial direction and the spectral distribution on the left and right sides may be different, which may adversely affect the irradiated object. The problem caused by this separated light emission is particularly noticeable in lamps having a light emission length of 200 mm or more.

Since the difference in the spectral distributions on the left and right is different from the right and left of the bulb in relation to the saturated vapor pressure of thallium iodide, it is considered that the difference in the amount of thallium iodide on the left and right appears as a difference in the spectral distribution.

When ultraviolet ray was irradiated when the amount of thallium iodide encapsulation in FIG. 8 was 0.036 mg / cc, no separate light emission was observed in the axial direction, the left and right spectral distributions were the same, and high uniformity was applied to the irradiated object. ) Was obtained. Therefore, high homogeneity is obtained on the left and right, and it becomes possible to improve the hardening speed of curable resin composition.

9 illustrates the ratios of the respective curing times when ultraviolet light is irradiated to photoinitiators 4 and 4'-bis (diethylamino) benzophenone using an iron metal halide lamp and a thallium-based metal halide lamp according to the embodiment. It is explanatory drawing to say.

That is, when thallium iodide inclusion amount is 0.01 mg / cc or more, the hardening time by the metal halide lamp which concerns on embodiment is 101% or more with respect to the hardening time by an iron metal halide lamp. When the amount of thallium iodide is 0.06 mg / cc or less, the curing time by the metal halide lamp according to the embodiment is below the curing time by the iron metal halide lamp. However, when the amount of thallium iodide is 0.04 mg / cc or more, the curing time is improved, but as described above, there is a problem in that luminescence separation occurs and a place where the curing time is fast and slow occurs.

Therefore, when an iron metal halide lamp is used when the amount of thallium iodide in the thallium iodide lamp of the thallium-based metal halide lamp that irradiates ultraviolet rays to the photoinitiator 4,4'-bis (diethylamino) benzophenone is 0.01 to 0.036 mg / cc It was found that favorable results were obtained in comparison with the.

10 shows the ratios of the respective curing times when the photoinitiator 4,4'-bis (dimethylamino) benzophenone was irradiated with ultraviolet rays using an iron metal halide lamp and a thallium-based metal halide lamp according to the embodiment. It is explanatory drawing explaining.

In this case, when thallium iodide inclusion amount is 0.006 mg / cc or more, the hardening time by the metal halide lamp which concerns on embodiment is 101% or more with respect to the hardening time by an iron metal halide lamp. When the amount of thallium iodide is 0.002 mg / cc or less, the curing time by the metal halide lamp according to the embodiment is below the curing time by the iron metal halide lamp. However, when the amount of thallium iodide is 0.04 mg / cc or more, the curing time is improved, but there is a problem in that luminescence separation occurs and a place where the curing time is fast and slow occurs.

Therefore, when the thallium iodide loading amount of the thallium-based metal halide lamp that irradiates ultraviolet rays to the photoinitiator 4,4'-bis (dimethylamino) benzophenone is 0.006 to 0.036 mg / cc, it is compared with the case of using the iron metal halide lamp. It was found that favorable results were obtained.

For this reason, it is understood that even if the amount of thallium iodide encapsulation is too large, the curing rate of the curable resin composition having a high absorption rate at a long wavelength ultraviolet ray of at least 350 to 380 nm cannot be improved.

Therefore, 4,4'-bis (diethylamino) benzophenone is a photoinitiator as the loading amount ((mg / cc)) of thallium iodide which becomes a condition which improves the hardening rate of curable resin composition of high absorption at 350-380 nm. In the case, it turned out that it exists in the range of 0.01-0.036. Moreover, when 4, 4'-bis (dimethylamino) benzophenone was a photoinitiator, it turned out that it exists in the range of 0.006-0.036.

According to this embodiment, it becomes possible to improve the hardening speed of the ultraviolet curable resin composition containing the photoinitiator which has a high absorption wavelength range in the ultraviolet-ray of 350-380 nm long wavelength.

Claims (5)

In the metal halide lamp which irradiates the said ultraviolet-ray to the ultraviolet curable resin composition containing the photoinitiator which has the absorption wavelength range in at least 350-380 nm long wavelength ultraviolet-ray,
Hermetic container made of ultraviolet light transmitting material,
A discharge electrode made of a pair of refractory metals and sealed in the hermetic container, and
A metal halide lamp comprising an enclosure enclosed in the hermetic container including argon gas, mercury and thallium halide. The method of claim 1,
And the photoinitiator comprises 4, 4'-bis (diethylamino) benzophenone. The method of claim 2,
The thallium halide contained in the inclusion is thallium iodide,
A thallium iodide loading amount (X) (mg / cc) is a metal halide lamp, characterized in that 0.01≤X≤0.036. The method of claim 1,
The photoinitiator is a metal halide lamp, characterized in that 4,4'-bis (diethylamino) benzophenone. The method of claim 4, wherein
The thallium halide contained in the inclusion is thallium iodide,
A thallium iodide loading amount (X) (mg / cc) is a metal halide lamp, characterized in that 0.006≤X≤0.036.

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