JP2017132090A - Resin molded article, lighting cover and lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin molded article which can express high antifouling performance at low cost.SOLUTION: A resin molded article 20 comprises a plastic base material 22, a fluorine resin layer 24 that coats a first region 28 of the surface of the plastic base material 22, and a silicone resin layer 26 that coats a second region 30 of the surface of the plastic base material 22, which is different from the first region 28.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a resin molded product having a surface subjected to antifouling treatment, a lighting cover, and a lighting fixture.

  For example, a lighting fixture such as a ceiling light includes a fixture body, a lamp supported by the fixture body, and a lighting cover attached to the fixture body so as to cover the lamp. The illumination cover is formed of a resin material having translucency.

  In this type of lighting fixture, the surface of the lighting cover is subjected to antifouling treatment in order to suppress a decrease in illuminance and a reduction in appearance quality due to dirt and the like adhering to the surface of the lighting cover. As a technique for antifouling treatment, for example, a technique for suppressing adhesion of dirt by applying a water-repellent antifouling paint to the surface of the lighting cover (see Patent Document 1), and dirt adhering to the surface of the lighting cover. A technique for decomposing with a photocatalyst (see Patent Document 2) is known.

JP 2011-194683 A JP 10-149707 A

  However, the following problems arise in the conventional antifouling treatment described above. In the antifouling treatment described in Patent Document 1, an increase in the cost of the antifouling paint, such as the material cost and the painting cost, is unavoidable, and depending on the antifouling paint material, there is a risk of adversely affecting the optical performance of the lighting fixture. is there. On the other hand, in the antifouling treatment described in Patent Document 2, since a certain amount or more of light energy is required to decompose the dirt with the photocatalyst, the antifouling performance is expressed in a dark place where the amount of light is insufficient. I can't.

  This invention is made | formed in view of such a subject, and it aims at providing the resin molded product, lighting cover, and lighting fixture which can express high antifouling performance at low cost.

  In order to solve the above problems, a resin molded product according to an aspect of the present invention includes a plastic substrate, a fluororesin layer covering a first region of the surface of the plastic substrate, and the plastic substrate. A silicone resin layer covering a second region different from the first region of the surface.

  The lighting cover according to one embodiment of the present invention is a lighting cover that is translucent and covers a light source of a lighting fixture, and includes a plastic base and a radially outer side of the surface of the plastic base. A fluororesin layer that covers the region; and a silicone resin layer that covers a radially inner region of the surface of the plastic substrate.

  According to the resin molded product etc. which concern on 1 aspect of this invention, high antifouling performance can be expressed at low cost.

It is a perspective view which shows the external appearance of the lighting fixture which concerns on embodiment. It is the II-II sectional view taken on the line of FIG. It is sectional drawing which expands and shows a part of lighting cover which concerns on embodiment. It is a top view which shows the lighting fixture which concerns on embodiment. It is a top view which shows the lighting fixture which concerns on a modification. For each of the lighting covers obtained in Examples 1 to 3 and Comparative Examples 1 to 6, (1) Water contact angle, (2) Magic repelling, (3) Appearance evaluation, and (4) Cost evaluation It is a table | surface which shows an evaluation result.

  Embodiments of the present invention will be described below. Note that each of the embodiments described below shows a preferred specific example of the present invention. Therefore, the numerical values, shapes, materials, components, arrangement positions and connection forms of the components shown in the following embodiments are merely examples, and are not intended to limit the present invention. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims showing the highest concept of the present invention are described as optional constituent elements.

  Each figure is a mimetic diagram and is not necessarily illustrated strictly. In each figure, substantially the same configuration is denoted by the same reference numeral, and redundant description is omitted or simplified.

(Embodiment)
Hereinafter, the resin molded product, the lighting cover, and the lighting fixture according to the embodiment will be described.

[1-1. Overall configuration of lighting equipment]
First, the whole structure of the lighting fixture 2 which concerns on embodiment is demonstrated, referring FIG.1 and FIG.2. FIG. 1 is a perspective view showing an appearance of a lighting fixture 2 according to an embodiment. 2 is a cross-sectional view taken along line II-II in FIG.

  As shown in FIG.1 and FIG.2, the lighting fixture 2 is a circular ceiling light by the XY planar view installed in the ceiling 4 of buildings, such as a house, for example. The lighting fixture 2 includes a fixture body 6, a lamp 8 (an example of a light source), and a lighting cover 10. 1 and 2, the negative side of the Z-axis represents the upper side (ceiling 4 side), and the positive side of the Z-axis represents the lower side (floor surface side). For convenience of explanation, in FIG. 1, the luminaire 2 is illustrated in a posture that is upside down from the posture during normal use.

  The instrument body 6 is a housing for supporting the lamp 8 and the illumination cover 10. The instrument body 6 is formed in a circular disk shape in the XY plan view, and is fixed to the ceiling 4 with screws (not shown). The instrument body 6 is formed into a predetermined shape by, for example, pressing a metal plate such as an aluminum plate or a steel plate.

  A plurality of mounting brackets 12 for detachably mounting the lamp 8 are provided on the lower surface of the instrument body 6. The plurality of mounting brackets 12 are arranged at intervals in the circumferential direction of the instrument body 6. On the lower surface of the fixture body 6, an engaged portion 14 that is detachably engaged with an engaging portion 18 (described later) of the illumination cover 10 is further formed. The engaged portion 14 is disposed on the radially outer side of the instrument body 6 with respect to the plurality of mounting brackets 12 and extends over the entire circumference of the instrument body 6. A support portion 16 is further formed on the lower surface of the appliance main body 6 for suppressing rattling of the illumination cover 10 and the like. The support portion 16 is disposed on the radially outer side of the instrument body 6 with respect to the engaged portion 14, and extends over the entire circumference of the instrument body 6. In a state where the lighting cover 10 is attached to the instrument body 6, the support unit 16 supports the lighting cover 10 from the radially outer side.

  The lamp 8 is, for example, an annular LED (Light Emitting Diode) lamp for emitting white light. The lamp 8 is detachably attached to a plurality of mounting brackets 12 of the instrument body 6. Although not shown, the lamp 8 has an annular glass tube, an annular substrate disposed inside the glass tube, and a plurality of LEDs mounted at intervals along the circumferential direction of the substrate. ing.

  The illumination cover 10 is a glove for covering the lamp 8. The illumination cover 10 is formed in a circular dome shape in an XY plan view, and is detachably attached to the instrument body 6. In the opening of the illumination cover 10, an engaging portion 18 that is detachably engaged with the engaged portion 14 of the instrument body 6 is formed. The engaging portion 18 protrudes inward in the radial direction of the lighting cover 10.

  When the lighting cover 10 is attached to the instrument body 6, the lighting cover 10 is rotated in a predetermined direction with respect to the instrument body 6 after the engaging portion 18 is inserted inside the support portion 16 of the instrument body 6. Thereby, the engaging part 18 is engaged with the engaged part 14 of the instrument main body 6, and the illumination cover 10 is attached to the instrument main body 6. On the other hand, when the illumination cover 10 is rotated in the direction opposite to the predetermined direction with respect to the instrument body 6, the engagement portion 18 is disengaged from the engaged portion 14 of the instrument body 6, so that the illumination cover 10 is It is removed from the main body 6. When detaching the lighting cover 10 from the fixture body 6, the user first places the first outer side in the radial direction on the surface of the lighting cover 10 (that is, the surface exposed to the outside of the lighting fixture 2). The region 28 (see FIG. 3 described later) is touched by hand.

  The illumination cover 10 is formed of a light-transmitting resin material (plastic material), such as acrylic (PMMA) or polycarbonate (PC). As a result, the light emitted from the lamp 8 toward the illumination cover 10 passes through the illumination cover 10 and is extracted outside the illumination cover 10.

  Furthermore, antifouling treatment is performed on the surface of the lighting cover 10 by applying two types of antifouling paints having different antifouling performances without overlapping. Further, by applying an antifouling paint combined with light diffusing particles to the surface of the lighting cover 10, the lighting cover 10 having both antifouling performance and light diffusion performance can be obtained. The antifouling treatment of the lighting cover 10 will be described in detail in the next section.

[1-2. Antifouling treatment of lighting cover]
Next, the antifouling process of the illumination cover 10 will be described in detail with reference to FIGS. 3 and 4. FIG. 3 is an enlarged cross-sectional view of a part of the lighting cover 10 according to the embodiment. FIG. 4 is a plan view showing the luminaire 2 according to the embodiment.

  As shown in FIGS. 3 and 4, the illumination cover 10 is a resin molded product 20 formed in a circular dome shape in an XY plan view. The resin molded product 20 has a plastic substrate 22 formed of, for example, acrylic or polycarbonate. Two types of antifouling paints having different antifouling performance, that is, fluorine resin paint and silicone resin paint, are applied to the surface of the plastic substrate 22 (that is, the surface exposed to the outside of the lighting fixture 2) without overlapping. Has been. The fluororesin paint is an antifouling paint mainly composed of a fluororesin and has a relatively high antifouling performance. The silicone resin paint is an antifouling paint mainly composed of a silicone resin, and has a slightly lower antifouling performance than the fluororesin paint. Thereby, as shown in FIGS. 3 and 4, the surface of the plastic substrate 22 is covered with the fluororesin layer 24 formed of the fluororesin paint and the silicone resin layer 26 formed of the silicone resin paint. It becomes like this. Note that the cost required to apply the fluororesin paint (such as the material cost and coating cost of the antifouling paint) is higher than the cost required to apply the silicone resin paint.

  As shown in FIGS. 3 and 4, the fluororesin layer 24 covers the first region 28 on the outer surface in the radial direction on the surface of the plastic substrate 22. On the other hand, the silicone resin layer 26 covers the second region 30 on the inner surface in the radial direction on the surface of the plastic substrate 22. The first region 28 and the second region 30 are different from each other, and are arranged adjacent to each other without overlapping on the surface of the plastic substrate 22. For convenience of explanation, in FIG. 4, the first region 28 and the second region 30 are provided with two different types of shading patterns. An alternate long and short dash line in FIG. 4 represents a boundary line between the first region 28 and the second region 30. Note that there is no region other than the first region 28 and the second region 30 on the surface of the plastic substrate 22.

  Here, a method for forming the fluororesin layer 24 and the silicone resin layer 26 on the surface of the plastic substrate 22 will be described. For example, the fluororesin paint is applied to the first region 28 on the surface of the plastic substrate 22 and the silicone resin paint is applied to the second region 30 on the surface of the plastic substrate 22 by gravure printing or inkjet. Thereby, the fluororesin layer 24 is formed in the 1st area | region 28 in the surface of the plastic base material 22 with a fluororesin coating material. On the other hand, a silicone resin layer 26 is formed in the second region 30 on the surface of the plastic substrate 22 by a silicone resin paint.

  The radially outer side is a region that is 40% or more of the distance from the center 32 of the plastic substrate 22 to the outermost periphery 34 in the direction from the radial center 32 of the plastic substrate 22 to the outermost periphery 34. On the other hand, the radially inner side is a region other than the region defined on the radially outer side of the plastic substrate 22. In particular, the radially outer side is an area of 60% or more of the distance from the center 32 of the plastic substrate 22 to the outermost periphery 34, and the radially inner side is more preferably the other area. However, the region defined on the radially outer side and the region defined on the radially inner side are in contact with each other on the surface of the plastic base material 22, and the surface of the plastic base material 22 has a region other than the two regions. Shall not exist.

  Examples of the fluororesin contained in the fluororesin layer 24 include polytrifluoroolefin, polychlorotrifluoroethylene, polytetrafluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, and ethylene. Tetrafluoroethylene copolymer, polyvinylidene fluoride, polyvinyl fluoride or the like is preferably used. Moreover, as a silicone resin contained in the silicone resin layer 26, for example, organopolysilane, organopolysiloxane, organopolysilazane, organopolysilthian or the like is preferably used.

  Each of the fluororesin layer 24 and the silicone resin layer 26 may be combined with an acrylic resin. As the acrylic resin, for example, a polymer of a monomer having one or two or more carbon-carbon double bonds is used. Specific examples of the monomer include (meth) acrylate monomers, styrene monomers, olefin monomers, and vinyl monomers. The amount of the acrylic resin combined is preferably 1000 parts by weight or less, more preferably 500 parts by weight or less with respect to 100 parts by weight of the fluororesin (or silicone resin).

  Further, each of the fluororesin layer 24 and the silicone resin layer 26 may be combined with light diffusion particles. The light diffusing particles are particles for imparting light diffusing performance to the light diffusing layer formed of the coating composition. By combining light diffusing particles with each of the fluororesin layer 24 and the silicone resin layer 26, in addition to the antifouling performance, the light diffusing performance corresponding to the in-plane brightness can be expressed. As the light diffusing particles, for example, at least one of benzoguanamine resin particles, styrene particles, silicone particles, melamine resin particles, polytetrafluoroethylene (PTFE) particles, and inorganic particles is used. As the inorganic fine particles, for example, at least one of barium sulfate, calcium carbonate, crystalline silica, amorphous silica, glass flakes, glass fibers, and glass beads is used. The amount of the light diffusing particles combined is preferably 10 to 60 parts by weight and more preferably 20 to 50 parts by weight with respect to 100 parts by weight of the fluororesin (or silicone resin).

  When the light diffusing particles are combined with each of the fluororesin layer 24 and the silicone resin layer 26, the amount of the light diffusing particles to be combined varies depending on the position of the lamp 8 in the instrument body 6. As shown by a broken line in FIG. 4, the lamp 8 is arranged in a donut shape in a region away from the center of the instrument body 6 in the radial direction in the XY plan view. Therefore, the amount of the light diffusing particles is relatively large in the region immediately below the lamp 8 of the plastic base material 22 (the region surrounded by the two concentric circles in FIG. 4), and the other region (the plastic base material 22 The area at the center 32 and the outermost circumference 34) is relatively small. As a result, the light diffusivity is relatively high in the region immediately below the lamp 8 of the plastic substrate 22 and relatively low in the other regions. As a result, the shape of the lamp 8 is not clearly reflected over the lighting cover 10, the concealability of the image of the lamp 8 can be improved, and the uniformity of light emission can be improved. The amount of the light diffusing particles to be combined varies depending on the type of the luminaire 2. For example, the light diffusivity of the other region is 80% of the light diffusivity of the region immediately below the lamp 8 of the plastic substrate 22. It is adjusted so that:

[1-3. effect]
As described above, the resin molded product 20 of the present embodiment includes the plastic substrate 22, the fluororesin layer 24 that covers the first region 28 on the surface of the plastic substrate 22, and the surface of the plastic substrate 22. A first resin layer 26 that covers a second region 30 different from the first region 28.

  According to this, the surface of the plastic substrate 22 is covered with two types of antifouling paints having different antifouling performances, that is, the fluororesin layer 24 and the silicone resin layer 26. For example, on the surface of the plastic base material 22, a region (first region 28) where dirt easily adheres because the user's hand is easy to touch is covered with a fluororesin layer 24 having a relatively high antifouling performance. A region (second region 30) where dirt is difficult to adhere because of being difficult to touch is covered with a silicone resin layer 26 having a relatively low antifouling performance. Thereby, compared with the case where the whole surface of the plastic base material 22 is coat | covered with the fluororesin layer 24, the cost required to apply | coat an antifouling paint can be suppressed. Therefore, the resin molded product 20 that can exhibit high antifouling performance at low cost can be obtained.

  Furthermore, at least one of the fluororesin layer 24 and the silicone resin layer 26 includes an acrylic resin.

  According to this, by mixing the acrylic resin with the fluororesin layer 24, the blending ratio of the fluororesin in the fluororesin layer 24 is relatively reduced. Similarly, by combining an acrylic resin with the silicone resin layer 26, the blending ratio of the silicone resin in the silicone resin layer 26 is relatively reduced. By combining a relatively inexpensive acrylic resin in this way, the proportion of the relatively expensive fluororesin or silicone resin is relatively reduced, further reducing the cost required to apply the antifouling paint. Can do.

  Furthermore, at least one of the fluororesin layer 24 and the silicone resin layer 26 includes light diffusing particles.

  According to this, the resin molded product 20 having both antifouling performance and light diffusion performance can be obtained.

  Moreover, the illumination cover 10 of this Embodiment is translucent and is an illumination cover for covering the lamp | ramp 8 of the lighting fixture 2. FIG. The lighting cover 10 includes a plastic substrate 22, a fluororesin layer 24 that covers the first outer region 28 in the radial direction on the surface of the plastic substrate 22, and a second radially inner layer in the surface of the plastic substrate 22. And a silicone resin layer 26 covering the region 30.

  According to this, the surface of the plastic substrate 22 is covered with two types of antifouling paints having different antifouling performances, that is, the fluororesin layer 24 and the silicone resin layer 26. For example, on the surface of the plastic base material 22, a radially outer region (first region 28) where dirt easily adheres because the user's hand is easy to touch is covered with a fluororesin layer 24 having a relatively high antifouling performance. Then, the region (second region 30) on the inner side in the radial direction in which dirt is difficult to adhere because the user's hand is difficult to touch is covered with the silicone resin layer 26 having a relatively low antifouling performance. Thereby, compared with the case where the whole surface of the plastic base material 22 is coat | covered with the fluororesin layer 24, the cost required to apply | coat an antifouling paint can be suppressed. Therefore, it is possible to obtain the lighting cover 10 that can exhibit high antifouling performance at low cost.

  Moreover, the lighting fixture 2 of this Embodiment is provided with the lamp | ramp 8 which emits light, and one of the illumination covers 10 which cover the lamp | ramp 8 mentioned above.

  According to this, the lighting fixture 2 which can express high antifouling performance at low cost can be obtained.

(Modification)
Next, the configuration of a lighting fixture 2A according to a modification will be described with reference to FIG. FIG. 5 is a plan view showing a lighting fixture 2A according to a modification. In this modification, the same components as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 5, the lighting fixture 2 </ b> A according to the present modification is a rectangular (square type) ceiling light in an XY plan view. The illumination cover 10A is a resin molded product 20A formed in a rectangular box shape in an XY plan view.

  Similar to the above-described embodiment, the fluororesin layer 24 covers the first region 28A on the outer side in the radial direction on the surface of the plastic substrate 22A. On the other hand, the silicone resin layer 26 covers the second region 30A on the radially inner side of the surface of the plastic substrate 22A. For convenience of explanation, in FIG. 5, two different types of shading patterns are given to the first region 28A and the second region 30A, respectively. The alternate long and short dash line in FIG. 5 represents the boundary line between the first region 28A and the second region 30A. Note that there is no region other than the first region 28A and the second region 30A on the surface of the plastic substrate 22A.

  Therefore, also in this modification, high antifouling performance can be expressed at low cost, as in the above embodiment.

(Examples and Comparative Examples)
In order to confirm the effect of the present invention, the following experiment was conducted.

[2-1. Example]
[2-1-1. Example 1]
In Example 1, Lumiflon LF-200 manufactured by Asahi Glass Co., Ltd. was used as the fluororesin, and Chisso Corporation Silaplane was used as the silicone resin. Moreover, Nippon Polyurethane Industry Co., Ltd. coronate HX (hexamethylene diisocyanate) was used as a crosslinking agent. As an antifouling paint, a) a fluororesin paint in which 20 parts by weight of a cross-linking agent is combined with 100 parts by weight of the fluororesin; b) a silicone resin paint in which 20 parts by weight of a cross-linking agent is combined with 100 parts by weight of the silicone resin; Was used.

  In addition, an acrylic resin sheet (600 × 600 mm, plate thickness 1.5 mm, transmittance: 56%, light diffusivity: 80%) was used as the plastic substrate, and the plastic substrate was formed using a gravure printing machine manufactured by Orient Sogyo Co., Ltd. An antifouling paint was applied to the surface. Specifically, the fluororesin coating was applied to a region radially outside the radius of 180 mm from the center of the plastic substrate so that the dry film thickness was 3 μm. In addition, a silicone resin paint was applied to a region radially inward from the center of the plastic substrate with a radius of 180 mm so that the dry film thickness was 3 μm.

  Thus, the plastic base material which apply | coated the antifouling paint was shape | molded in the ceiling light glove shape of diameter 300mm as shown in FIGS. 1-3 using a pressure forming machine. After the molding, the lighting cover was produced by holding in a molding machine mold at 110 ° C. for 10 minutes and then cooling.

[2-1-2. Example 2]
In Example 2, Acrydic 52-666-BA manufactured by DIC Corporation was used as the acrylic resin. As an antifouling paint, a) a fluororesin paint in which 20 parts by weight of the cross-linking agent of Example 1 and 50 parts by weight of an acrylic resin are combined with 50 parts by weight of the fluororesin of Example 1, and b) the silicone resin of Example 1 A silicone resin paint in which 20 parts by weight of the crosslinking agent of Example 1 and 50 parts by weight of an acrylic resin were combined with respect to 50 parts by weight was used. Using the plastic substrate of Example 1, a lighting cover was produced by the same coating method and molding method as in Example 1.

[2-1-3. Example 3]
In Example 3, Nippon Shokubai Eposter MS was used as the light diffusing particles. Considering the position of the lamp in the main body of the instrument, the antifouling paint is a) a fluororesin in which 20 parts by weight of the crosslinking agent of Example 1 and 30 parts by weight of light diffusing particles are combined with 100 parts by weight of the fluororesin of Example 1. A paint, b) a fluororesin paint in which 20 parts by weight of the crosslinking agent of Example 1 and 40 parts by weight of light diffusing particles are combined with 100 parts by weight of the fluororesin of Example 1, and c) the silicone resin 100 of Example 1. A silicone resin paint in which 20 parts by weight of the crosslinking agent of Example 1 and 30 parts by weight of light diffusing particles were combined with each part by weight was prepared.

  In addition, an acrylic resin sheet (600 × 600 mm, plate thickness 1.5 mm, transmittance: 92.5%, light diffusivity: 7.5%) is used as a plastic substrate, and a gravure printing machine manufactured by Orient Sogyo Co., Ltd. is used. An antifouling paint was applied to the surface of the plastic substrate. Specifically, in a region radially outward from a radius of 230 mm from the center of the plastic base material, a) a fluororesin paint in which 20 parts by weight of a crosslinking agent and 30 parts by weight of light diffusion particles are combined with 100 parts by weight of the fluororesin Was applied so that the dry film thickness was 10 μm. Further, in a region having a radius of 150 mm to 230 mm from the center of the plastic substrate, b) a fluororesin paint in which 20 parts by weight of a crosslinking agent and 40 parts by weight of light diffusion particles are combined with 100 parts by weight of the fluororesin has a dry film thickness of 10 μm. It applied so that it might become. Further, a silicone resin paint in which c) 20 parts by weight of a crosslinking agent and 30 parts by weight of light diffusing particles are combined with 100 parts by weight of the silicone resin in a region radially inward from the radius of 150 mm from the center of the plastic substrate is a dry film. It was applied so that the thickness was 10 μm. Then, the illumination cover was produced by the molding method similar to Example 1.

[2-2. Comparative example]
[2-2-1. Comparative Example 1]
In Comparative Example 1, Lumiflon LF-200 manufactured by Asahi Glass Co., Ltd. was used as the fluororesin, and Coronate HX (hexamethylene diisocyanate) manufactured by Nippon Polyurethane Industry Co., Ltd. was used as the crosslinking agent. As the antifouling paint, a fluororesin paint in which 20 parts by weight of a crosslinking agent was combined with 100 parts by weight of the fluororesin was used. An acrylic resin sheet (600 × 600 mm, plate thickness 1.5 mm, transmittance: 56%, light diffusivity: 80%) is used as the plastic substrate, and the fluororesin paint is dried over the entire surface of the plastic substrate. It apply | coated uniformly with the gravure printing machine by Orient Sogo Co., Ltd. so that it might become 3 micrometers.

  Thus, the plastic base material which apply | coated the antifouling paint was shape | molded in the ceiling light glove shape of diameter 300mm as shown in FIGS. 1-3 using a pressure forming machine. After the molding, the lighting cover was produced by holding in a molding machine mold at 110 ° C. for 10 minutes and then cooling.

[2-2-2. Comparative Example 2]
In Comparative Example 2, Chisso Corporation Silaplane was used as the silicone resin, and Nippon Polyurethane Industry Coronate HX (hexamethylene diisocyanate) was used as the crosslinking agent. As the antifouling paint, a silicone resin paint in which 20 parts by weight of a crosslinking agent was combined with 100 parts by weight of the silicone resin was used. A silicone resin paint was uniformly applied to the entire surface of the plastic substrate of Comparative Example 1 by a gravure printing machine manufactured by Orient Sogyo Co., Ltd. so that the dry film thickness was 3 μm. Then, the illumination cover was produced with the molding method similar to the comparative example 1.

[2-2-3. Comparative Example 3]
In Comparative Example 3, Lumiflon LF-200 manufactured by Asahi Glass Co., Ltd. was used as the fluororesin, and Chisso Corporation Silaplane was used as the silicone resin. Moreover, Nippon Polyurethane Industry Co., Ltd. coronate HX (hexamethylene diisocyanate) was used as a crosslinking agent. As an antifouling paint, a) a fluororesin paint in which 20 parts by weight of a cross-linking agent is combined with 100 parts by weight of the fluororesin; b) a silicone resin paint in which 20 parts by weight of a cross-linking agent is combined with 100 parts by weight of the silicone resin; Was used.

  An antifouling paint was applied to the surface of the plastic substrate of Comparative Example 1 using a gravure printing machine manufactured by Orient Sogyo Co., Ltd. Specifically, the fluororesin paint was applied to a region radially outside the radius of 100 mm from the center of the plastic substrate so that the dry film thickness was 3 μm. In addition, a silicone resin paint was applied to a region radially inward from the radius of 100 mm from the center of the plastic substrate so that the dry film thickness was 3 μm. Then, the illumination cover was produced with the molding method similar to the comparative example 1.

[2-2-4. Comparative Example 4]
In Comparative Example 4, Acrydic 52-666-BA manufactured by DIC Corporation was used as an acrylic resin. As an antifouling paint, a) a fluororesin paint obtained by combining 130 parts by weight of the crosslinking agent of Comparative Example 1 and 600 parts by weight of an acrylic resin with respect to 50 parts by weight of the fluororesin of Comparative Example 1, and b) a silicone resin of Comparative Example 2 A silicone resin paint in which 130 parts by weight of the crosslinking agent of Comparative Example 1 and 600 parts by weight of an acrylic resin were combined with respect to 50 parts by weight was used. Using the plastic substrate of Comparative Example 1, a lighting cover was produced by the same coating method and molding method as in Example 1.

[2-2-5. Comparative Example 5]
In Comparative Example 5, Nippon Shokubai Eposter MS was used as the light diffusing particles. Considering the position of the lamp in the apparatus body, the antifouling paint is a) a fluororesin paint in which 20 parts by weight of a crosslinking agent and 5 parts by weight of light diffusing particles are combined with 100 parts by weight of the fluororesin, and b) the fluororesin 100. Fluorine resin paint in which 20 parts by weight of crosslinking agent and 10 parts by weight of light diffusing particles are combined with respect to parts by weight; and c) Silicone resin in which 20 parts by weight of crosslinking agent and 5 parts by weight of light diffusing particles are combined with 100 parts by weight of silicone resin. Each paint was prepared.

  Also, an acrylic resin sheet (600 × 600 mm, plate thickness 1.5 mm, transmittance: 92.5%, diffusivity: 7.5%) is used as a plastic substrate, and plastic is used using a gravure printing machine manufactured by Orient Sogyo Co., Ltd. An antifouling paint was applied to the surface of the substrate. Specifically, a fluororesin paint in which 20 parts by weight of a crosslinking agent and 5 parts by weight of light diffusion particles are combined with 100 parts by weight of a fluororesin in a region radially outward from a radius of 230 mm from the center of the plastic substrate. Was applied so that the dry film thickness was 10 μm. Further, in a region having a radius of 150 mm to 230 mm from the center of the plastic substrate, b) a fluororesin paint in which 20 parts by weight of a crosslinking agent and 10 parts by weight of light diffusion particles are combined with 100 parts by weight of the fluororesin has a dry film thickness of 10 μm. It applied so that it might become. Further, a silicone resin coating in which c) 20 parts by weight of a crosslinking agent and 5 parts by weight of light diffusion particles are combined with 100 parts by weight of the silicone resin in a region radially inward from the radius of 150 mm from the center of the plastic substrate is a dry film. It was applied so that the thickness was 10 μm. Then, the illumination cover was produced with the molding method similar to the comparative example 1.

[2-2-6. Comparative Example 6]
In Comparative Example 6, Nippon Shokubai Eposter MS was used as the light diffusing particles. Considering the position of the lamp in the apparatus main body, a) a fluororesin paint in which 20 parts by weight of a crosslinking agent and 60 parts by weight of light diffusion particles are combined with 100 parts by weight of the fluororesin, and b) the fluororesin 100 Fluorine resin paint in which 20 parts by weight of crosslinking agent and 70 parts by weight of light diffusing particles are combined with respect to parts by weight; and c) 20 parts by weight of crosslinking agent and 60 parts by weight of light diffusing particles are combined with 100 parts by weight of silicone resin. A silicone resin paint was prepared.

  An antifouling paint was applied to the surface of the plastic substrate of Comparative Example 5 using a gravure printing machine manufactured by Orient Sogyo Co., Ltd. Specifically, a fluororesin paint in which 20 parts by weight of a crosslinking agent and 60 parts by weight of light diffusion particles are combined with 100 parts by weight of a fluororesin in a region radially outward from a radius of 230 mm from the center of the plastic substrate. Was applied so that the dry film thickness was 10 μm. Further, in a region having a radius of 150 mm to 230 mm from the center of the plastic substrate, b) a fluororesin paint in which 20 parts by weight of a crosslinking agent and 70 parts by weight of light diffusion particles are combined with 100 parts by weight of the fluororesin has a dry film thickness of 10 μm. It applied so that it might become. Further, a silicone resin paint in which c) 20 parts by weight of a crosslinking agent and 60 parts by weight of light diffusing particles are combined with 100 parts by weight of the silicone resin in a region radially inward from the radius of 150 mm from the center of the plastic substrate is a dry film. It was applied so that the thickness was 10 μm. Then, the illumination cover was produced with the molding method similar to the comparative example 1.

[2-3. Evaluation]
For the lighting covers (samples) obtained in Examples 1 to 3 and Comparative Examples 1 to 6, respectively, (1) Water contact angle, (2) Magic repelling, (3) Appearance evaluation, and (4) Cost evaluation Each item was evaluated. In each sample, for (1) water contact angle and (2) magic repelling, (A) a region 100 mm away from the center of the plastic substrate, (B) a region 220 mm away from the center of the plastic substrate, (C) Each measurement was performed in a region 280 mm away from the center of the plastic substrate. Moreover, about (3) external appearance evaluation, only Example 3, the comparative example 5, and the comparative example 6 which compounded the light-diffusion particle were evaluated.

(1) Water contact angle Using a contact angle meter (manufactured by Kyowa Interface Science Co., Ltd .: DM500), the water contact angle when water was dropped onto the surface of the plastic substrate coated with the antifouling paint was measured. Evaluation was made based on the following criteria.

<Criteria>
90 ° or more: ○ Less than 90 °: ×

(2) Magic repellency Whether or not magic ink is repelled by writing characters on the surface of the plastic substrate coated with antifouling paint using magic ink (Teranishi Chemical Co., Ltd .: M-500T1) which is an oil marker. Whether or not the characters can be erased by wiping several times with Kimwipe (manufactured by Nippon Paper Crecia Co., Ltd.) was evaluated according to the following criteria.

<Criteria>
Magic ink repels and characters can be erased: ○
Magic ink repels and characters cannot be erased: △
Magic ink does not repel and characters cannot be erased: ×

(3) Appearance evaluation Using an LED ceiling light (manufactured by Panasonic Corporation: HH-LC869A), the concealability of the image of the lamp was visually confirmed and evaluated according to the following criteria.

<Criteria>
The shape of the lamp cannot be visually confirmed and the light emission is uniform: ◯ The shape of the lamp is blurred and the interval between adjacent LEDs can be determined: Δ
The shape of the lamp can be confirmed visually: ×

(4) Cost evaluation The material cost of the lighting cover was evaluated according to the following criteria.

<Criteria>
Lower than the material cost of Example 1:
Almost the same amount as the material cost of Example 1: ○
Higher than material cost of Example 1:

[2-4. Evaluation results]
6 shows (1) water contact angle, (2) magic repelling, (3) appearance evaluation, and (4) cost evaluation for the lighting covers obtained in Examples 1 to 3 and Comparative Examples 1 to 6, respectively. It is a table | surface which shows the evaluation result of each item of.

  As shown in FIG. 6, in Comparative Example 1, there was no problem in antifouling performance because the fluororesin paint was uniformly applied, but the material cost was high because only the fluororesin paint was used as the antifouling paint. In Comparative Example 2, since the silicone resin paint was uniformly applied, the antifouling performance of the radially outer region of the plastic base material that was easy to touch and adhere to the user's hand decreased. In Comparative Example 3, since the area to which the fluororesin coating was applied was large, the antifouling performance of the region outside the radial direction of the plastic substrate was improved, but the material cost was increased. In Comparative Example 4, although the material cost was reduced by combining the acrylic resin, the antifouling performance on the surface of the plastic substrate was significantly reduced. In Comparative Example 5, there was no problem in antifouling performance because the amount of the light diffusing particles was small, but the concealability of the image of the lamp was lowered because the light diffusibility was low. In Comparative Example 6, since the amount of the light diffusing agent was large, the concealability of the lamp image was improved, but the antifouling performance of the surface of the plastic substrate was lowered.

  On the other hand, as shown in FIG. 6, in Example 1, the antifouling performance of the outer region in the radial direction of the plastic substrate that is easily touched by the user and easily contaminated while suppressing an increase in material cost. I was able to increase. In Example 2, by combining the acrylic resin with the fluororesin paint and the silicone resin paint, the material cost could be further reduced as compared with Example 1, and the antifouling performance could be improved. In Example 3, while suppressing an increase in material cost, an appropriate amount of light diffusing particles is combined with each of a fluororesin paint and a silicone resin paint, so that antifouling performance and lamp image concealment can be achieved even on a transparent plastic substrate. Together.

  As the evaluation result mentioned above shows, it was confirmed that the resin molded product, the lighting cover and the lighting fixture according to the present invention can exhibit high antifouling performance at low cost.

(Other variations)
While the present invention has been described based on the embodiments and the modifications, the present invention is not limited to the above-described embodiments and the like.

  For example, in the above-described embodiment and the like, the lighting cover 10 (10A) is a lighting cover for a ceiling light, but is not limited to this. For example, a pendant type light, a sink lamp, a bathroom lamp, a chandelier, a stand, a bracket, Gyoen, garage lights, eaves lights, gatepost lights, porch lights, garden lights, entrance lights, footlights, stairs lights, guide lights, security lights, downlights, base lights, illuminated signs, sign lights or vehicles (eg automobiles) Alternatively, it may be a lighting cover used for a motorcycle or the like.

  For example, in the above embodiment and the like, the illumination cover 10 (10A) is attached to the fixture body 6 so as to cover the entire lamp 8, but is not limited thereto, and covers only a part of the lamp 8. It may be attached to the instrument body 6.

  For example, in the above-described embodiment, the acrylic resin is combined with both the fluororesin layer 24 and the silicone resin layer 26. However, the acrylic resin is combined only with either the fluororesin layer 24 or the silicone resin layer 26. Also good. Similarly, in the above-described embodiment and the like, the light diffusing particles are combined with both the fluororesin layer 24 and the silicone resin layer 26. However, the light diffusing particles are applied only to either the fluororesin layer 24 or the silicone resin layer 26. It may be combined.

  In addition, it is realized by arbitrarily combining the components and functions in the embodiments and the like obtained by making various modifications conceived by those skilled in the art to the above embodiments and the like, and without departing from the spirit of the present invention. This form is also included in the present invention.

2,2A Lighting fixture 8 Lamp (light source)
10, 10A Lighting cover 20, 20A Plastic molded product 22, 22A Plastic base material 24 Fluorine resin layer 26 Silicone resin layer 28, 28A First region 30, 30A Second region

Claims (5)

A plastic substrate;
A fluororesin layer covering the first region of the surface of the plastic substrate;
A silicone resin layer covering a second region different from the first region on the surface of the plastic substrate. The resin molded product according to claim 1, wherein at least one of the fluororesin layer and the silicone resin layer includes an acrylic resin. The resin molded product according to claim 1, wherein at least one of the fluororesin layer and the silicone resin layer includes light diffusing particles. A light cover that is translucent and covers a light source of a lighting fixture,
A plastic substrate;
A fluororesin layer covering a radially outer region on the surface of the plastic substrate;
A silicone resin layer covering a radially inner region of the surface of the plastic substrate. A light source that emits light;
The lighting fixture of Claim 4 which covers the said light source.

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