JPH0428036Y2 - - Google Patents

Description

[Detailed explanation of the idea]

INDUSTRIAL APPLICATION FIELD The present invention relates to a sheet that can measure the amount of ultraviolet rays in lighting equipment such as fluorescent lamps and ultraviolet lamps that emit light rays containing ultraviolet rays. Problems to be Solved by Conventional Technologies and Ideas Conventionally, there has been no means for measuring ultraviolet rays that can estimate the capacity, lifespan, or amount of illumination of the above-mentioned lighting equipment, and the appearance of such a means has been eagerly awaited. Means for Solving the Problems The present invention was made to solve the above problems, and as shown in FIG. A capsule containing a composition obtained by dissolving a material in a solvent-based solvent is used as an element for measuring ultraviolet radiation dose, and a rewetting adhesive layer 2 for ultraviolet measurement made by dispersing this in a rewetting adhesive. The present invention provides a sheet for ultraviolet light measurement. Specific examples of photoactive agents used in the present invention are as follows. The photoactivator has the general formula R-C-X ₃ () (wherein R is allyl, alkyl, aralkyl,
aroyl, alkenyl group, halogen, hydrogen, X represents halogen),
Examples include carbon tetrabromide, p-nitrobenzotribromide, bromotrichloromethane, tetrachlorotetrahydronaphthalene, 1,1,1-tribromo-2-methyl-2-propanol, and trichloroacetamide. Another photoactive agent has the general formula (In the formula, _R groups, alkoxy groups, etc.
Also, not all substituents need to be the same)
Specific examples of such compounds include o-nitro-α, α, α
-tribromoacetophenone, m-nitro-α,
α,α-tribromoacetophenone, p-nitro-α,α,α-tribromoacetophenone, α,
α, α-tribromoacetophenone, α, α, α
-m-tetrabromoacetophenone, α, α,
α,α',α',α'-hexabromo-p-diacetylbenzene can be mentioned. Still another photoactive agent is a compound represented by the general formula R-S-X () (wherein R represents an alkyl group, an allyl group, or an allyl group having a substituent, and X represents a halogen). Specific examples of such compounds include 2,4-dinitrobenzenesulfenyl chloride and o-nitrobenzenesulfenyl chloride. Yet another photoactivator has the general formula (In the formula, A may be substituted with a heterocyclic compound residue, and R ₁ , R ₂ and R ₃ are independently hydrogen, chlorine,
Examples of such compounds include ω, ω, ω-tribromoquinaldine,
2-ω,ω,ω-tribromo-methyl-4-methylquinoline, ω-bromlepidine, 4-phenyl-6-ω,ω,ω-tribromomethylpyrimidine, 2,5-ditribromomethyl-3,4- Examples include dibromthiophene. Yet another photoactivator has the general formula (In the formula, X ₁ , X _{2 and} Examples of such compounds include hexabromodimethyl sulfoxide, hexabromodimethyl sulfon, trichloromethyl phenyl sulfon, tribromomethyl phenyl sulfon, Examples include 4,6-dimethylpyridine-2-tribromomethylsulfone and tetrabromodimethylsulfone. As mentioned above, the color change agent used in the present invention is a compound that changes color due to the action of free radicals when a photoactive agent generates free radicals due to the action of ultraviolet rays. There are substances that change color due to the action of free radicals, and substances that originally have an inherent color that change to a different color or are decolored due to the action of free radicals. Typical examples of the former include diphenylamine, dibenzylamine, triphenylamine, N-hydroxyethyl-N-ethylaniline, p,p'-methylenebis(N,N-diethylaniline), etc. amine compounds, leuco-based pigments such as leuco crystal violet, leucomalachite green, Michler's hydrol, leucomethylene blue, etc.
3-diethylamino-7-chlorofluorane, 3
-Methylamino-6-chlorofluorane, 3-dimethylamino-6-methoxyfluorane, 3-cyclohexylamino-6-chlorofluorane, 3
-diethylamino-benzo(a)-fluorane, 3-
Diethylamino-6-aminofluorane, 3,6
-dimethoxyfluorane, 3-diethylamino-
Fluoran compounds such as 7-dibenzylaminofluorane and 3-diethylamino-6-methyl-7-chlorofluorane, bis(4-diethylamino-2-methylphenyl)phenylmethane, tris(4-diethylamino-2-methylphenyl)methane, Bis(4-dimethylamino-2-methoxyphenyl)phenylmethane, bis(4-diethylamino-2-methylphenyl)(4-diethylaminophenyl)methane, bis(4-diethylamino-2-methylphenyl)(3,4-dimethoxy polyarylalkane compounds such as phenyl)methane, bis(4-dibenzylamino-2-methylphenyl)phenylmethane, 1-phenyl-3-
Examples include pyrazoline compounds such as (p-diethylamino)styryl-5-(p-diethylamino)phenyl-2-pyrazoline. On the other hand, as examples of the latter, various dyes such as diphenylmethane, triphenylmethane, thiazine, oxazine, xanthene, anthraquinone, iminonaphthoquinone, and azomethine can be effectively used. Examples include auramine, Victoria blue, benzoylmethylene blue, cinnamoylmethylene blue, rhodamine, 4-p-diethylaminophenylimino naphthoquinone, p-methoxybenzoyl-p-diethylamino-o-methylphenyliminoacetanilide, 1 -phenyl-3-methyl-4-p-
Diethylaminophenylimino-5-pyrazolone and the like can be mentioned. Next, as the ultraviolet absorber used in the present invention, any conventionally commonly used ultraviolet absorber can be mentioned, and specific examples include:
Examples include para-aminobenzoic acid derivatives (PABA derivatives), cinnamic acid derivatives, salicylic acid derivatives, camphor derivatives, benzophenone derivatives, urocanic acid derivatives, nitrogen-containing heterocyclic derivatives, and the like. The ultraviolet radiation dose measuring element layer as used in the present invention is coated or bonded to a suitable support. As such a support, any material such as paper, plastic film, glass plate, metal plate, etc. can be used, but it is preferable to use photographic base paper, plastic coated paper, etc., since vivid colors can be obtained. Transparent ones are preferable because they can be measured while attached. As described above, the ultraviolet sensitive composition constituting the element layer for ultraviolet dose measurement described above is used by being encapsulated in a capsule together with a solvent. By dispersing these capsules in the rewetting adhesive used in the present invention, a rewetting adhesive layer for ultraviolet measurement can be obtained. Various resins can be used for the outer shell of the capsule, but those with good film-forming ability and non-blocking properties are preferred. For example, polystyrene, styrene-acrylic acid copolymer, styrene-butadiene copolymer, polyester resin, acrylic resin, epoxy resin, polyvinyl butyral, etc. may be used alone or in combination. Further, the encapsulation technique used in the present invention includes, for example, an in-liquid drying method, an interfacial polymerization method, an in-situ polymerization method, a spray drying method, and the like. In addition, rewetting adhesives become sticky in the presence of moisture and exhibit adhesive functions for articles; specific examples include polyvinyl alcohol, vinyl alcohol-vinyl acetate copolymer, glue, gum arabic, dextrin, etc. There is a well-known thing. Next, the blending ratio of the components for forming an ultraviolet measuring element in the present invention is as follows. Photoactivator: 0.1 to 100 parts by weight Color change agent: 0.1 to 200 parts by weight Ultraviolet absorber: 0.1 to 200 parts by weight In the present invention, the above components dispersed in the rewetting adhesive have poor affinity by being encapsulated in capsules. It is protected from contact with moisture, while the components in the capsule are sufficiently compatible, so that the coloring sensitivity to ultraviolet light can be improved and its functionality can be maintained. The thickness of the rewetting adhesive layer for UV measurement used in the sheet of the present invention can be selected as appropriate, but generally the thickness of the rewetting adhesive layer for UV measurement is 0.5 to 30 μm for the support of 20 to 200 μm. be able to. The ultraviolet measurement sheet of the present invention as described above is prepared by adding moisture to the surface layer containing the rewetting adhesive by an appropriate means, and then directly attaching it to a lighting fixture, etc. that generates the ultraviolet light to be measured. The irradiated ultraviolet rays are received from the side to which it is attached. As a result, in the capsule of the rewetting adhesive layer for ultraviolet measurement, free radicals are generated from the photoactivator depending on the amount of ultraviolet ray irradiation, and act on the color change agent to cause a distinct and vivid color change. This can be visually determined if the support is transparent, or by peeling off the sheet itself if it is not. At this time, the presence of the ultraviolet absorber allows the amount of free radicals generated from the photoactivator during irradiation with ultraviolet rays to be adjusted, thereby slowing down the color change, and making it possible to measure the amount of ultraviolet rays caused by the color change. Therefore, if you create standards for the amount of UV irradiation and color change in advance, you can easily measure the amount of UV irradiation without any special skill, and if you analyze the color using a spectrophotometer, Furthermore, the irradiation dose of ultraviolet rays can be easily measured with high accuracy. Even if the sheet according to the present invention is peeled off from the object to which it is attached, the photoactivator, color change agent, and ultraviolet absorber are protected by the capsule, so there is no effect on the measured value, and the temperature is -20 to 60℃. The influence of temperature is negligible. In addition, once peeled off, the sheet can be reattached and used for further continuous measurements. Embodiments Next, embodiments of the present invention will be described. Example 1 A capsule containing a composition having the following composition was prepared on a polyester tape having a thickness of 75 μm, and this was mixed with an aqueous solution of polyvinyl alcohol and applied to obtain an ultraviolet measurement sheet of the present invention. Leuco crystal violet 1.0g Tetrabromodimethylsulfone 0.1g N,N-dimethylpara-aminobenzoic acid 2-ethylhexyl ester 7g Vinyl acetate-2-ethyl acrylate Hexyl-N-butoxymethyl acrylamide copolymer 10g Solvent Toluene Some amount Obtained as above The relationship between the amount of ultraviolet rays irradiated and the color of the ultraviolet ray measurement sheet of the present invention is as follows.

[Table] As is clear from the results in Table 1, the ultraviolet measurement sheet according to the present invention is, for example, white before being irradiated with ultraviolet rays, but its hue and degree of color change as the irradiation dose increases. The change in hue is gradual, and the irradiation dose can be measured based on the change in color. Therefore, by creating a standard for ultraviolet irradiation dose and color change in advance, it was possible to easily measure the irradiation dose even without skilled techniques. Example 2 Leucomethylene blue 1g α,α,α-tribromoacetophenone 0.5g 2-hydroxy-4-methoxybenzophenone 5g Xylene Some amount Capsules containing the above formulation as a composition were prepared and prepared as in Example 1. In the same manner, a sheet for ultraviolet measurement according to the present invention was prepared. The results of evaluating the obtained sheet were as shown in Table 2.

[Table] As is clear from the results in Table 2, the irradiation dose of ultraviolet rays could be easily measured in this case as well as in Example 1 without the need for skilled techniques. Effects of the invention As explained above, the ultraviolet measurement sheet according to the invention becomes adhesive by adding moisture to the surface of the rewetting adhesive layer for ultraviolet measurement, and is applied to the surface of instruments, etc. During its manufacture, all UV measurement materials are encapsulated in a capsule while coexisting in an organic solvent, so they are not affected by water-based rewetting adhesives that have poor affinity. The coating layer is formed without being exposed to UV radiation, and the amount of ultraviolet rays can be measured with extremely high sensitivity. Further, if the support is transparent, it can be left attached, or if it is not, it can be peeled off from the instrument surface and used to quantitatively measure the amount of ultraviolet rays.

[Brief explanation of drawings]

The figure is a sectional view showing an example of the present invention. 1...Support, 2...Rewetting adhesive layer for ultraviolet ray measurement.

Claims (1)

[Scope of utility model registration request] This ultraviolet ray measuring sheet is characterized in that a rewettable adhesive layer 2 for ultraviolet ray measuring is provided on a support 1, the rewettable adhesive layer 2 being formed by dispersing capsules containing a composition obtained by dispersing a photoactivator, a discolorant and an ultraviolet ray absorber in a solvent-based solvent.