JP5331602B2 - Optical element and lighting apparatus using the same - Google Patents

Description

  The present invention relates to an optical element that controls transmission or reflection of light and a lighting fixture using the optical element.

  In lighting fixtures installed in living rooms, dining rooms, kitchens, etc., the main stains anxious to the user are oil stains and cotton dust. Oil stains occur, for example, when oil smoke generated when cooking yakiniku, hot pot, okonomiyaki, etc. in a kitchen or table floats and comes into contact with the lighting equipment, and oils and fats adhere to the lighting equipment. Cotton dust does not adhere to the lighting fixture due to static electricity, but firmly adheres to the lighting fixture due to the presence of oils and fats attached to the lighting fixture. Therefore, if the oil and fat adhering to the lighting fixture is removed, the cotton dust can be removed simultaneously with the removal of the oil stains.

  By the way, the frequency which cleans the lighting fixture installed in the kitchen etc. is less than once a year for most users. Further, the user feels dissatisfied that cleaning is difficult because the cover that covers the light source of the lighting fixture is difficult to remove. Further, the cleaning performed by the user is usually performed by physically removing dirt such as hitting the lighting fixture with a scratch or wiping the cover with the lighting fixture attached. However, even if cleaning is performed in this manner, it is difficult to completely remove stains on the lighting fixture, in particular, oils and fats adhering to the lighting fixture. Moreover, since the new dirt easily adheres to the surface of the dirt left after wiping, the lighting apparatus becomes easily dirty.

  In order to improve the removability of the lighting fixture, a detergent mainly composed of a surfactant or an alkaline compound is used. Since the detergent weakens the adhesion of dirt to the lighting device, the user can easily wipe off the dirt. However, the detergent causes rough hands and dermatitis of the user, and damages the surface of the lighting apparatus.

  Therefore, there is known a lighting fixture that has a light-transmitting cover that covers a light source, and is coated with titanium oxide on the surface of the cover opposite to the side facing the light source (see, for example, Patent Document 1). . The titanium oxide of this lighting fixture exhibits a photocatalytic effect by absorbing the ultraviolet rays irradiated from the light source. Since the surface of the cover becomes hydrophilic due to this photocatalytic effect, the user can easily remove oil stains attached to the cover. However, since the amount of ultraviolet light that passes through the cover and reaches the titanium oxide on the cover surface is very small, a sufficient photocatalytic effect cannot be obtained, and the dirt removal property of the lighting fixture is low. In addition, this lighting fixture cannot exhibit a photocatalytic effect when an incandescent lamp, an LED, or the like that emits light that does not include an ultraviolet wavelength is used as a light source.

  Further, there is known a lighting fixture that has a light-transmitting cover that covers a light source, and a surface of the cover opposite to the side facing the light source is covered with a visible light reaction type photocatalyst (for example, Patent Documents). 2). The visible light reaction type photocatalyst of this lighting fixture exhibits the photocatalytic effect by absorbing visible light irradiated from a light source. Since the floating organic matter is adsorbed and decomposed by this photocatalytic effect, the user can easily remove oil stains adhering to the cover. However, since the cover absorbs visible light, the irradiation amount of light emitted from the lighting fixture is reduced.

  Further, as shown in FIG. 6A, an optical element 101 that includes an oil-repellent layer 112 on the surface of a base 111 and transmits light is known (see, for example, Patent Document 3). Since the oil repellent layer 112 easily repels the oil and fat 15, the optical element 101 is difficult to attach the oil and fat 15, and even if it adheres, it can be easily removed by wiping immediately after the adhesion. However, when the oil / fat 15 is left for a long time in a state of adhering to the oil-repellent layer 112, as shown in FIG. 6B, the oil / fat 15 takes in oxygen 16 in the air and oxidizes. Oxidized fat 15 (shown in gray) increases in molecular weight, increases in viscosity, and solidifies. Therefore, it becomes difficult for the user to remove the oxidized oil 15 from the optical element 101.

JP 2004-154227 A JP 2005-259389 A JP-A-5-258336

  The present invention has been made to solve the above-described problems, and allows a user to easily remove oils and fats left on the surface for a long time without requiring light for the photocatalytic effect. An object is to provide an optical element.

In order to achieve the above object, the invention according to claim 1 is an optical element comprising an oil repellent layer on the surface of a base material and transmitting or reflecting light. The oil repellent layer contains an oxygen adsorbent and has an oleic acid contact angle. There Ri der 50 ° or more, the oxygen adsorbent, which a main agent ascorbic acid and its salts, dibutyl hydroxyanisole (BHA), those gallic acid ester, at least one of the salcomine compound selected .

A second aspect of the present invention, a lighting fixture, but formed by using an optical element according to claim 1.

According to the invention of claim 1, since the oleic acid contact angle of the oil repellent layer is 50 ° or more, the oil and fat are easily repelled, the oil and fat are prevented from sticking to the oil repellent layer, and the oxygen adsorbent absorbs oxygen in the air. Since it is adsorbed, it is possible to prevent solidification by suppressing oxidation of the attached oil. Therefore, even if the fats and oils are left on the oil repellent layer for a long period of time, the user can easily remove the fats and oils. Moreover, since light is not required for the removal of fats and oils, it can be transmitted or reflected without reducing the amount of light irradiation. Moreover, since the oxygen adsorbent more adsorbs oxygen in the air, it is possible to further suppress the oxidation of the attached oil and fat.

According to invention of Claim 2, the lighting fixture which can obtain the above effects can be provided.

The side sectional view of the lighting fixture which uses the optical element concerning one embodiment of the present invention. The optical element is shown partially enlarged, (a) is a side sectional view when fats and oils adhere to the oil repellent layer, and (b) is a side sectional view when the oxygen adsorbent adsorbs oxygen. The graph which shows the relationship between the viscosity of the fats and oils which adhered to the optical element, and elapsed time, and the relationship between the viscosity of the fats and oils which adhered to the conventional optical element, and elapsed time. The exploded view of the lighting fixture which uses the modification of the optical element. The sectional side view of the apparatus used for the oil dirt wiping test which concerns on the same optical element and the conventional optical element. The conventional optical element is shown partially enlarged, (a) is a side cross-sectional view when the fats and oils adhere to the oil repellent layer, (b) is a side cross-sectional view when the fats and oils take in oxygen.

  FIG. 1 shows a configuration of a lighting fixture 2 using an optical element 1 according to an embodiment of the present invention. In the present embodiment, the optical element 1 is a glove (cover) that transmits light emitted from the lighting fixture 2, and constitutes one component of the lighting fixture 2. The lighting fixture 2 includes an optical element 1 as a globe, a light source 3, a fixture main body 5 installed on the ceiling 4, and a holder 6 provided on the fixture main body 5 and holding the light source 3.

  Examples of the light source 3 include a xenon lamp, a fluorescent lamp, a light emitting diode (LED), an organic EL, a high-intensity discharge lamp (HID) such as a mercury lamp or a metal halide lamp. The instrument body 5 includes a lighting circuit 7 for controlling lighting of the light source 3 and a locking portion 9 that locks and holds the peripheral edge 8 of the optical element 1.

  FIG. 2 shows the detailed configuration of the optical element 1 and the situation when the oil 15 is attached. The optical element 1 includes a base material 11 formed of plastic, glass, or the like, and an oil repellent layer 12 provided on the surface of the base material 11. The oil repellent layer 12 has a resin material 13 and an oxygen adsorbent 14 added to the resin material 13, and the oleic acid contact angle in the oil repellent layer 12 is 50 ° or more.

  The optical element 1 is (1) the material of the oil-repellent layer 12 is applied to the base material 11 and cured, (2) the oil-repellent layer 12 and the base material 11 are simultaneously molded by coextrusion molding, and (3) the coating is formed in advance. The oil-repellent layer 12 is formed by any method of transferring to the substrate 11. Further, the optical element 1 is formed so that the oil repellent layer 12 is disposed on the surface opposite to the side facing the light source 3 when installed in the instrument body 5.

  The resin material 13 is made of, for example, fluorine resin, silicone resin, fluorine acrylic resin, silicone acrylic resin, resin containing silicone acrylic and melamine, resin containing silicone acrylic and isocyanate, resin containing fluorine acrylic and melamine, fluorine acrylic and isocyanate. Resin.

  The oxygen adsorbent 14 is a substance that selectively adsorbs oxygen. In particular, when at least one of ascorbic acid and its salt, dibutylhydroxytoluene (BHT), dibutylhydroxyanisole (BHA), gallic acid ester, and salcomines is selected as the oxygen adsorbent 14, the optical Since the element 1 adsorbs more oxygen 16 in the air, it is possible to further suppress the oxidation of the attached oil 15.

  Next, the function and effect of the optical element 1 configured as described above will be described. As shown in FIG. 2A, in the optical element 1, oil and fat 15 adheres to the oil repellent layer 12 when oil smoke is generated by cooking or the like. Thereafter, as shown in FIG. 2B, the optical element 1 is solidified by suppressing the oxidation of the attached oil 15 because the oxygen adsorbent 14 adsorbs oxygen 16 in the air in the vicinity of the optical element 1. To prevent. Further, since the optical element 1 has an oleic acid contact angle of the oil repellent layer 12 of 50 ° or more, the oil 15 is easily repelled, and the oil 15 is prevented from sticking to the oil repellent layer 12. Therefore, even if the fat 15 is left on the oil repellent layer 12 for a long time, the user can easily remove the fat 15 from the optical element 1. In addition, since light for photocatalytic effects such as visible light and ultraviolet light is not required to remove the oil 15, the optical element 1 can be transmitted without reducing the light irradiation amount.

  FIG. 3 compares the change in the viscosity of fats and oils over time according to the optical element 1 of the present embodiment (dotted line) and the change in the viscosity of oils and fats over time according to the conventional optical element (solid line). Show. Oils and fats adhering to conventional optical elements undergo an oxidation reaction with the passage of time as shown by the abc curve, increasing the molecular weight and increasing the viscosity. On the other hand, the fat and oil adhering to the optical element 1 of the present embodiment increases in viscosity with the passage of time as indicated by the a′-b′-c ′ curve. In addition, the value of the viscosity of fats and oils at points a ′, b ′, and c ′ is the same value as the corresponding points a, b, and c.

  When fats and oils are vegetable oils generally used at home, the point a is approximately one month from the attachment of the fats, the point b is three months from the attachment of the fats and oils, and the point c is approximately six months from the attachment of the fats and oils. ing. Similarly, approximately 6 months have passed since the a 'point has adhered to the oil, the b' point has been 12 months since the oil has been adhered, and the c 'point has been approximately 18 months since the oil has been adhered. Thus, the oil and fat adhering to the optical element 1 of the present embodiment has an oxidation reaction more than three times that of the oil and fat adhering to the conventional optical element by the oxygen adsorbent 14 suppressing the association between the oil and fat. Become slow.

  FIG. 4 shows a lighting fixture 2 according to a modification of the present embodiment. The optical element 1 is not a globe for transmitting the light emitted from the light source 3 as in the above embodiment, but a reflecting mirror for reflecting the light emitted from the light source 3. It is the same. The lighting fixture 2 according to this modification includes an optical element 1, a fixture main body 5 to which the optical element 1 is attached, and a holder 6 that is provided on the fixture main body 5 and holds the light source 3. The optical element 1 as a reflecting mirror is formed such that the oil-repellent layer 12 is disposed on the surface facing the light source 3 when the material of the base material 11 is a metal and is placed on the instrument body 5. . Also in the optical element 1 as such a reflecting mirror, the same effect as the optical element 1 as the above-mentioned globe can be obtained.

  Next, Examples 1 to 11 and Comparative Examples 1 to 8 in the above-described optical element 1 of the present embodiment will be described (refer to FIG. 2 for the optical element 1).

Example 1
The resin material 13 of the oil repellent layer 12 is a lacquer-type side-chain fluoroacrylic resin (hereinafter referred to as resin material A) having a trade name of Fluorosurf FG-5040 (manufactured by Fluoro Technology Co., Ltd.), and the oxygen adsorbent 14 is L-ascorbic acid A stearic acid ester is added, and 1 part of the oxygen adsorbent 14 is added to 100 parts of the resin material 13. The base material 11 is a PMMA plate having a thickness of 2 mm whose product name is Acripet VH001 (manufactured by Mitsubishi Rayon Co., Ltd.), and the resin material 13 to which the oxygen adsorbent 14 is added is 5 to 10 μm using an air spray. After coating with a thickness of about, the optical element 1 was obtained by drying at 100 ° C. for 20 minutes.

(Example 2)
Optical element 1 was obtained in the same manner as Example 1 except that resin material 13 was a resin containing side chain dimethylsiloxane acrylic polyol and isocyanate (hereinafter referred to as resin material B). Specifically, the resin material B is an acrylic resin 100 having a trade name of ZX-022 (solid content: 46% by mass, hydroxyl value of 120) (manufactured by Fuji Kasei Kogyo Co., Ltd.) and a hydroxyl group as a crosslinking group. The product name is TPA100 (solid content 100%) (Asahi Kasei Chemicals Co., Ltd.) 20 parts isocyanate resin, ethyl acetate 100 parts, butyl acetate 100 parts, isophorone 30 parts, and mixed with stirring for 5 minutes Use what you did.

(Example 3)
Optical element 1 was obtained in the same manner as in Example 2 except that dibutylhydroxytoluene (BHT) was used as oxygen adsorbent 14 and 1 part of oxygen adsorbent 14 was added to 100 parts of resin material 13.

Example 4
Optical element 1 was obtained in the same manner as in Example 2 except that dibutylhydroxyanisole (BHA) was used as oxygen adsorbent 14 and 1 part of oxygen adsorbent 14 was added to 100 parts of resin material 13.

(Example 5)
The base material 11 is a borosilicate glass having a thickness of 2 mm whose trade name is BK7 (manufactured by Sumita Optical Glass Co., Ltd.), and the resin material 13 is a resin containing side chain dimethylsiloxane acrylic polyol and melamine (hereinafter referred to as resin material C). An optical element 1 was obtained in the same manner as in Example 3 except that. Specifically, the resin material C is an acrylic resin 100 having a trade name of ZX-022 (solid content 46 mass%, hydroxyl value 120) (manufactured by Fuji Kasei Kogyo Co., Ltd.) and a hydroxyl group as a crosslinking group. 20 parts of melamine resin whose product name is Uban 122 (solid content 60%) (manufactured by Mitsui Chemicals Co., Ltd.), and the product name is Catalyst 6000 (manufactured by Mitsui Chemicals Co., Ltd.) as a catalyst for melamine resin. A mixture of 3 parts of dodecylsulfonic acid, 70 parts of ethyl acetate, 70 parts of butyl acetate, 70 parts of n-butanol, and 30 parts of diacetone alcohol and mixed with stirring for 5 minutes is used.

(Example 6)
Resin material 13 is a resin containing side chain fluoroacrylic polyol and isocyanate (hereinafter referred to as resin material D), oxygen adsorbent 14 is BHT, and 1 part of oxygen adsorbent 14 is added to 100 parts of resin material 13 The optical element 1 was obtained in the same manner as in Example 5 except that. Specifically, the resin material D is an acrylic resin having a trade name of KD-220 (solid content 30% by mass, hydroxyl value 60) (manufactured by Kanto Denka Kogyo Co., Ltd.) and a hydroxyl group as a crosslinking group. To 100 parts, 7 parts of isocyanate resin whose trade name is TPA100 (100% solids) (Asahi Kasei Chemicals Co., Ltd.), 100 parts of ethyl acetate, 100 parts of butyl acetate and 30 parts of isophorone are blended for 5 minutes. What is stirred and mixed is used.

(Example 7)
Resin material 13 is a resin containing side-chain fluorine acrylic polyol and melamine (hereinafter referred to as resin material E), oxygen adsorbent 14 is propyl gallate, and 0.1 part of oxygen is adsorbed to 100 parts of resin material 13 An optical element 1 was obtained in the same manner as in Example 5 except that the agent 14 was added. Specifically, the resin material E is an acrylic resin having a trade name of KD-220 (solid content 30% by mass, hydroxyl value 60) (manufactured by Todenka Kogyo Co., Ltd.) and a hydroxyl group as a crosslinking group. 100 parts, 15 parts of melamine resin whose product name is Uban 122 (solid content 60%) (manufactured by Mitsui Chemicals), and dodecyl sulfone whose product name is catalyst 6000 (manufactured by Mitsui Chemicals) as a catalyst for melamine resin A mixture of 3 parts of acid, 40 parts of ethyl acetate, 40 parts of butyl acetate, 40 parts of n-butanol, and 20 parts of diacetone alcohol and mixed with stirring for 5 minutes is used.

(Example 8)
An optical element 1 was obtained in the same manner as in Example 1 except that the substrate 11 was a high-gloss Al plate having a thickness of 0.8 mm having a trade name of A370 (manufactured by Sumitomo Light Metal Industries, Ltd.).

Example 9
The optical element 1 is formed in the same manner as in Example 8 except that the resin material 13 is the resin material B, the oxygen adsorbent 14 is BHT, and 1 part of the oxygen adsorbent 14 is added to 100 parts of the resin material 13. Obtained.

(Example 10)
The optical element 1 is formed in the same manner as in Example 8 except that the resin material 13 is the resin material C, the oxygen adsorbent 14 is BHA, and 1 part of the oxygen adsorbent 14 is added to 100 parts of the resin material 13. Obtained.

(Example 11)
Resin material 13 was resin material D, oxygen adsorbent 14 was propyl gallate, and 0.1 part oxygen adsorbent 14 was added to 100 parts resin material 13 in the same manner as in Example 8. Optical element 1 was obtained.

(Comparative Example 1)
An optical element was obtained in the same manner as in Example 1 except that the resin material of the oil repellent layer and the oxygen adsorbent were not included.

(Comparative Example 2)
An optical element was obtained in the same manner as in Comparative Example 1 except that the base material was borosilicate glass.

(Comparative Example 3)
An optical element was obtained in the same manner as in Comparative Example 1 except that the base material was a high-gloss Al plate.

(Comparative Example 4)
An optical element was obtained in the same manner as in Example 1 except that the oil repellent layer did not have an oxygen adsorbent.

(Comparative Example 5)
An optical element was obtained in the same manner as in Comparative Example 4 except that the resin material was changed to the resin material B.

(Comparative Example 6)
An optical element was obtained in the same manner as in Comparative Example 4 except that the resin material was changed to the resin material C.

(Comparative Example 7)
An optical element was obtained in the same manner as in Comparative Example 4 except that the resin material was changed to the resin material D.

(Comparative Example 8)
An optical element was obtained in the same manner as in Comparative Example 4 except that the resin material was changed to the resin material E.

<Measurement of oleic acid contact angle>
The optical element 1 of Examples 1 to 11 and the optical elements of Comparative Examples 1 to 8 produced as described above were subjected to oleic acid oil on the measurement surface under conditions of a temperature of 23 ° C. and a relative humidity of 50%. A drop of 20 μl was dropped, and the contact angle after 30 seconds was measured using an automatic contact angle meter CA-W (Kyowa Interface Chemical Co., Ltd.). In the case of an optical element having an oil repellent layer, the measurement surface is the surface of the optical element on the side where the oil repellent layer is provided, and in the case of an optical element having no oil repellent layer, one of the optical elements is measured. .

<Oil dirt wiping test>
A configuration for conducting the test is shown in FIG. The produced optical element 1 according to Examples 1 to 11 is attached to a wire mesh 32, and the wire mesh 32 is attached to the vicinity of the opening of a range hood 34 provided with an exhaust duct 33. A hot plate 35 is installed directly below the optical element 1, and the oil 15 that is edible oil is heated and evaporated by the hot plate 35. The evaporated oil and fat (dotted arrow) becomes oil smoke, a part of which adheres to the optical element 1, and is then exhausted from the exhaust duct 33 via the range hood 34. In this state, the oil / fat 15 is adhered to the optical element 1 by being left for 30 minutes.

Next, after leaving the optical element 1 removed from the wire mesh 32 in a hot air circulation tank set at 60 ° C. for 168 hours, oil stains were wiped off. The oil stain was wiped off using a cotton cloth under the conditions that the wiping area was 5 cm ² , the wiping load was 100 g / cm ² , the wiping speed was 2 cm / s, and the number of reciprocations was 10 times. Judgment of the oil stain wiping property was defined as good when the oil stain was able to be wiped without being left uncleaned, slightly poor when the wiping streaks remained, and poor when it could not be wiped off. For the optical elements according to Comparative Examples 1 to 8, the oil stain wiping test is similarly performed. The determination results and the oleic acid contact angle relating to each optical element are shown in Table 1 below. The determinations of “good”, “slightly bad”, and “bad” were given as “O”, “Δ”, and “X” in this order.

  As is apparent from the results of performing an oil stain wiping test on the optical elements 1 of Examples 1 to 11 and the optical elements of Comparative Examples 1 to 8, according to the optical element 1 of the present embodiment, Even the oil 15 that has been left on the optical element 1 for a long time can be easily removed.

  In addition, this invention is not restricted to the structure of said embodiment, A various deformation | transformation is possible in the range which does not change the summary of invention. For example, in the above-described embodiment, the optical element has been provided with the oil repellent layer on one side, but the optical element may be provided with the oil repellent layer on both sides.

DESCRIPTION OF SYMBOLS 1 Optical element 2 Lighting fixture 11 Base material 12 Oil-repellent layer 14 Oxygen adsorbent

Claims (2)

In an optical element comprising an oil repellent layer on the surface of a substrate and transmitting or reflecting light,
The oil-repellent layer, as well as an oxygen adsorbent state, and are the 50 ° or higher contact angle with oleic acid,
The optical element according to claim 1, wherein the oxygen adsorbent is selected from at least one selected from ascorbic acid and salts thereof, dibutylhydroxyanisole (BHA), gallic acid ester, and salcomines . A lighting apparatus using the optical element according to claim 1 .

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