JP5541950B2 - Lighting cover - Google Patents

Description

The present invention relates to a lighting cover formed by an acrylic resin.

  2. Description of the Related Art Conventionally, there is known a method of obtaining a resin molded product by stretching and molding a resin sheet in which a resin is formed in a sheet shape. Examples of the molding method include vacuum molding, pressure molding, and press molding (see Patent Document 1). In a resin molded product obtained by such stretching, it is known to impart antistatic properties in order to reduce adhesion of dust and foreign matter. In order to impart antistatic properties, for example, a method in which a special surfactant (see Patent Documents 2 and 3) or an ionic material such as a quaternary ammonium salt (see Patent Document 4) is added to the resin material. Has been taken. Furthermore, regarding the anti-contamination property of resin molded products, antistatic properties have been adopted to reduce contamination, including not only electrostatic dirt such as dust but also hydrophobic dirt such as hydrophilic dirt and oils. In addition to the above, a technique for imparting water repellency to a resin material has been studied (see, for example, Patent Document 5).

JP-A-5-192990 JP 2008-231240 A JP 2008-201036 A JP 2009-51983 A JP 2009-155499 A

  However, when an ionic material such as a surfactant or a quaternary ammonium salt is added to the water repellent resin, there arises a problem that the water repellent function is lowered.

  Therefore, as a method of imparting antistatic properties without causing a decrease in the functions of low surface energy properties such as water repellency, a method of combining conductive fine particles with a resin is conceivable. However, even if an attempt is made to apply a conductive material to a molded product obtained by stretching and molding the resin composition, the conductive path is cut at the time of stretching, and thus antistatic properties cannot be maintained.

The present invention has been made in view of the above, vacuum molding, pressure molding, by molding with stretching, such as press molding, excellent lighting cover you exhibit low surface energy properties and antistatic properties The purpose is to provide.

The first invention includes an acrylic resin (A) having a water repellent group and a needle-like conductive metal oxide (B) in a base material made of an acrylic resin, and the needle-like conductive metal oxide (B An acrylic resin molded product obtained by stretching and molding an acrylic resin sheet on which a surface functional layer having a content of 10 to 150 parts by mass with respect to 100 parts by mass of the solid content of the acrylic resin (A) is laminated. an illumination cover, characterized by comprising using.

According to a second aspect of the present invention, in the illumination cover having the above-described configuration, the water-repellent group of the acrylic resin (A) is at least one selected from a dimethylsiloxane group represented by the following formula (1) and a fluoroalkyl group. There is a lighting cover characterized by being.

(N represents an integer of 2 or more)
According to a third aspect of the present invention, in the illumination cover configured as described above, the surface on the surface functional layer side has a surface resistivity of 10 ⁷ to 10 ¹³ Ω / □ and a water contact angle of 90 ° to 120 °. It is the lighting cover characterized by this.

According to the present invention, even after being stretched by molding, by exerting a low surface energy properties the surface functional layer and excellent antistatic properties, it is possible to obtain an excellent lighting cover smear resistance.

It is sectional drawing which shows the lighting fixture using an example of embodiment of the illumination cover of this invention.

  The acrylic resin molded product is formed by molding an acrylic resin sheet in which a surface functional layer is laminated on a base material made of acrylic resin.

  The acrylic resin used for the substrate is not particularly limited as long as it is an acrylic resin. For example, methyl methacrylate alone or a copolymer of this with acrylates such as methyl acrylate, butyl acrylate, and ethylhexyl acrylate is used. Can be used. The acrylic resin is good in terms of transparency and light resistance. As the base material for the acrylic resin, those obtained by a sheet molding method such as a glass cast production method, a continuous cast production method, and an extrusion production method can be used.

  The acrylic resin base material can contain various known additives by a known method as long as the performance is not impaired. Examples of such additives include coloring agents such as dyes and pigments; spreading agents and dispersing agents for improving the dispersibility of pigments and light diffusing agents; and core shells mainly composed of acrylic esters and methacrylic esters. Impact modifiers typified by rubber-like polymers having a type graft structure; heat-resistant stabilizers and weathering modifiers such as hindered amines, hindered phenols, and benzoates; benzotriazoles, benzophenones, UV absorbers such as triazines, malonic esters, salicylates, cyanoacrylates, oxanilides; flame retardants such as phosphate esters; lubricants such as palmitic acid and stearyl alcohol; organic and inorganic antibacterials Agents; antistatic agents and the like. In addition, these can also use multiple together as needed.

  In manufacturing an acrylic resin substrate, first, a predetermined amount of each component such as an acrylic resin is mechanically mixed with a mixing device such as a Henschel mixer or a tumbler. Next, the mixture is sufficiently melt-kneaded at a temperature of 200 to 260 ° C. using a uniaxial or biaxial screw extruder, a Banbury mixer, or the like. Then, an acrylic resin pellet is manufactured by granulating and pelletizing. Such acrylic resin pellets can be produced by a known general method. And the base material of an acrylic resin can be obtained by shape | molding this acrylic resin pellet in a sheet form. The molding method is not particularly limited, and known methods such as injection molding, extrusion molding, blow molding, and compression molding can be used.

  Although it does not specifically limit as thickness of the base material which consists of acrylic resins, For example, it can be 0.1-3 mm. When the thickness of the substrate is within this range, the moldability is excellent.

  The acrylic resin sheet is formed by laminating a surface functional layer on the surface of the acrylic resin substrate thus obtained.

  The surface functional layer contains an acrylic resin (A) having a water repellent group. The water repellent group is a functional group having a particularly low surface free energy, and examples thereof include a fluoroalkyl group, a fluoroalkylene group, and an alkyl group as shown below.

(Functional group) (structural formula) (surface free energy)
Fluoroalkyl groups CF ₃ - 6.7mJ / ^{m 2}
Fluoroalkylene group —CF ₂ — 18 mJ / m ²
Alkyl group CH ₃ - 24mJ / ^{m 2}
Note that each of the above structural formulas is an example having 1 carbon, CF ₃ -is a perfluoromethyl group, -CF ₂ -is a perfluoromethylene group, and CH ₃ -is a methyl group. is there.

  When the molecular chain having such a chemical structure is localized in the outermost surface layer of the resin molded product, high water repellency, low adhesion, and easy removal can be expressed. It is preferable that the water repellent group is present as a side chain of the acrylic resin, so that the water repellency can be further expressed.

  It is also preferable to have a dimethylsiloxane group as the water repellent group. Also when it has a dimethylsiloxane group, surface free energy can be reduced.

  More specifically, the water repellent group preferably has a dimethylsiloxane group represented by the above formula (1) or a fluoroalkyl group in the molecular skeleton of the resin. n is an integer of 1 or more, and the upper limit is not particularly limited, but is practically preferably 160. When n is 160 or less, the coating film properties such as hardness are good. Here, from the viewpoint of improving water repellency, the fluoroalkyl group is preferably a perfluoroalkyl group (an alkyl group in which all hydrogen atoms are substituted with fluorine atoms). Hereinafter, when a fluoroalkyl group or a perfluoroalkyl group is represented, these are collectively referred to as “(per) fluoroalkyl group”.

  The acrylic resin (A) having a water repellent group has (A-1) a monomer having a water repellent group and having a carbon-carbon double bond, and (A-2) a carbon- It is preferable that it is an acrylic resin formed by copolymerizing a monomer having a carbon double bond. That is, it is preferable that the surface functional layer has a water-repellent acrylic resin (A) obtained by copolymerization of the monomers (A-1) and (A-2) as one of the main components.

  As the monomer (A-1) having a water repellent group and having a carbon-carbon double bond, a monomer having a (per) fluoroalkyl group or a monomer having a dimethylsiloxane group can be used. .

  When the monomer as the component (A-1) has a (per) fluoroalkyl group, the monomer component is preferably a (meth) acrylate monomer or a vinyl monomer. Specific examples of (meth) acrylate monomers include, for example, trifluoroethyl (meth) acrylate, perfluorodecylethyl (meth) acrylate, perfluorooctylethyl (meth) acrylate, and perfluorohexylethyl (meth) acrylate. Perfluorobutylethyl (meth) acrylate, perfluoropolyether (meth) acrylate, and the like. Specific examples of the vinyl monomer include trifluoromethyl vinyl, perfluoroethyl vinyl, perfluoroethyl ether vinyl, and the like. Here, (meth) acrylate means acrylate or methacrylate.

  When the monomer as the component (A-1) has a dimethylsiloxane group, radical polymerizable polydimethylsiloxane can be used as the monomer component. More specifically, a linear polysiloxane chain having a radical polymerizable unsaturated bond moiety at one end can be used.

  As such a radical polymerizable polysiloxane, a monomer represented by the following formula (2) can be used.

In formula (2), R ₁ represents a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms. m represents an integer of 2 or more.

R _{1 in} formula (2) is, for example, an alkyl group having 1 to 10 carbon atoms (for example, methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group), aryl group having 6 to 10 carbon atoms. (For example, a phenyl group) or a C3-C10 cycloalkyl group (for example, a cyclohexyl group) can be mentioned, Preferably they are a hydrogen atom or a methyl group. M is preferably an integer of 10 or more, more preferably an integer of 30 or more. The upper limit of m is not particularly limited, but is practically preferably 160. When m is 160 or less, the coating film properties such as hardness are good.

  As the radical polymerizable polysiloxane, a monomer represented by the following formula (3) can also be used.

In formula (3), R ₂ represents a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms. p represents an integer of 2 or more. q represents an integer of 0 to 10.

R ₂ in Formula (3) is, for example, an alkyl group having 1 to 10 carbon atoms (for example, methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group), aryl having 6 to 10 carbon atoms. Examples thereof include a group (for example, a phenyl group) or a cycloalkyl group having 3 to 10 carbon atoms (for example, a cyclohexyl group), preferably a hydrogen atom or a methyl group. Further, p is preferably an integer of 10 or more, more preferably an integer of 30 or more. The upper limit of p is not particularly limited, but is practically preferably 160. q is preferably 3. When p is 160 or less, the coating film properties such as hardness are good.

  When radically polymerizable polysiloxane is used, it contains fluorine and has a carbon-carbon double bond in order to further improve water repellency, low adhesion, and easy removal, or to improve chemical resistance and light resistance. The component fluoroolefin may be further polymerized. Examples of the fluoroolefin include vinylidene fluoride, human rafluoroethylene, chlorotrifluoroethylene, hexafluoropropene and the like. These fluoroolefins may be used alone or in combination of two or more.

  Said (A-1) component can be used individually by 1 type or in mixture of 2 or more types.

  The content of the component (A-1) is 50 to 50% when the acrylic resin (A) obtained by copolymerizing the component (A-1) and the component (A-2) is used as a reference (100% by mass). The range is preferably 95% by mass. When the content of the component (A-1) is less than 50% by mass, the solubility in a solvent may be lowered. Further, if the content of the component (A-1) exceeds 95% by mass, the coating film may be fragile, and the coating film is easily cracked due to a rapid temperature change, etc., and is moisture-proof, insulating, and acid resistant. It may be difficult to maintain the sex. From the above viewpoint, the content of the component (A-1) in the acrylic resin (A) is more preferably in the range of 60 to 85% by mass.

  As the monomer (A-2) which does not have a water repellent group and has a carbon-carbon double bond, (meth) acrylate monomers, styrene monomers, olefin monomers, and vinyl monomers are preferable. .

  Examples of (meth) acrylate monomers include methyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isobornyl (meth) acrylate, glycidyl (meth) acrylate, benzyl (meth) acrylate, stearyl (meth) acrylate, and lauryl. (Meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, etc. are mentioned. Moreover, as a styrene-type monomer, styrene etc. are mentioned, for example. Examples of the olefin monomer include ethylene and propylene. Examples of the vinyl monomer include vinyl chloride and vinylidene chloride.

  Said (A-2) component can be used individually by 1 type or in mixture of 2 or more types.

  The content of the component (A-2) is 5 to 5 when the acrylic resin (A) obtained by copolymerizing the component (A-1) and the component (A-2) is used as a reference (100% by mass). A range of 50% by mass is preferred. When the content of the component (A-2) is less than 5% by mass, the coating film may be fragile. Moreover, when content of (A-2) component exceeds 50 mass%, there exists a possibility that the solubility to a solvent may become low. From the above viewpoint, the content of the component (A-2) in the acrylic resin (A) is more preferably in the range of 10 to 40% by mass.

  The method for polymerizing the component (A-1) and the component (A-2) is not particularly limited, and conventionally known methods can be used. That is, an appropriate method for polymerizing a carbon-carbon double bond can be used. The acrylic resin (A) preferably has a weight average molecular weight in the range of 50,000 to 800,000. The weight average molecular weight is determined, for example, by GPC (gel permeation chromatography) in terms of standard polystyrene. The component (A-1) and the component (A-2) may be copolymerized in a random manner or may be copolymerized in a block shape.

  The surface functional layer contains a needle-like conductive metal oxide (B) having a water repellent group. The conductive metal oxide (B) is a substance for imparting conductivity to the surface functional layer formed as a resin layer. In the acrylic resin molded product, conductivity is imparted by the conductive metal oxide (B), and the antistatic effect is improved. In general, fine particles are used for the conductive metal oxide (B). This conductive metal oxide (B) may have a function as a filler.

  Here, the needle shape is a material having a high aspect ratio (ratio of major axis to minor axis), and generally refers to a material having a major axis that is 10 times or more of the minor axis. When a needle-like metal oxide is used, the surface resistance is lowered with an addition amount smaller than that of a spherical one, and a current-carrying path is easily ensured even during stretching as compared with a spherical shape. In other words, in the case of a needle shape, the possibility that the particles cross and contact each other in the major axis direction is higher than that in the long axis direction. Will be higher.

  Thus, in the acrylic resin molded product, by adding the conductive metal oxide (B), the antistatic property is improved and the surface contamination can be effectively prevented. If the conductive metal oxide (B) is not blended, contaminants adhere to the surface of the resin of the acrylic resin molded product.

  As the conductive metal oxide (B), for example, a metal oxide doped with a non-oxide metal can be used, which is preferable. Specific examples of the metal oxide doped with the non-oxide metal include antimony-doped tin dioxide, aluminum-doped zinc oxide, gallium-doped zinc oxide, indium oxide, and antimony-doped titanium oxide. Among these, antimony-doped tin dioxide and aluminum-doped zinc oxide are preferable, and antimony-doped tin dioxide is more preferable. These conductive metal oxides (B) can be used alone or in combination of two or more.

  The content of the conductive metal oxide (B) is 10 to 150 parts by mass with respect to 100 parts by mass of the solid content of the acrylic resin (A) having a water repellent group. If the content of the conductive metal oxide (B) is higher than this, it will bleed out to the surface at the time of molding, resulting in poor surface properties. On the other hand, when the content of the conductive metal oxide (B) is less than this, the antistatic property is not sufficiently exhibited, and the contaminants adhere to the surface of the resin molded product.

When the conductive metal oxide (B) is blended in the above range, the surface resistivity on the surface functional layer side in the acrylic resin molded product can be more preferably 10 ⁷ to 10 ¹³ Ω / □. That is, the surface resistivity depends on the type and amount of the conductive metal oxide (B), but the surface low efficiency can be made a suitable range by setting the blending amount in the above range. Is.

And in an acrylic resin molded product, it is preferable that the surface resistivity of the surface at the surface functional layer side becomes 10 ⁷ to 10 ¹³ Ω / □. This surface resistivity is more preferably 10 ⁸ to 10 ¹² Ω / □. When the surface resistivity is 10 ¹³ Ω / □ or less, contaminants are difficult to adhere to the coating surface easily. On the other hand, when the surface resistivity is 10 ⁷ or more, it is easy to wipe off contaminants on the surface of the coating film, and it is possible to suppress deterioration of surface properties due to bleed-out of oxide on the surface layer.

  Here, the surface resistivity is a value based on JIS K 6911-1995. The surface resistivity is measured by, for example, Hiresta UPMCP-HT450 type (manufactured by Dia Instruments).

  The surface functional layer is formed by applying a resin composition containing an acrylic resin (A) having a water repellent group and a conductive metal oxide (B) to an acrylic resin substrate. Here, a filler, a solvent, etc. may be mix | blended with the resin composition. If a solvent is blended, it is possible to adjust the viscosity of the resin composition to be easily applied.

  The application method of the surface functional layer is not particularly limited, but a spray coating method, a dip coating method, a flow coating method, a spin coating method, a roll coating method, a brush coating method, a sponge coating method or the like is preferably used. Can be used.

  Moreover, it is although it does not specifically limit as a film thickness (coating film thickness) of the surface functional layer in a sheet | seat state (acrylic resin sheet), It is preferable that it is the range of 5-50 micrometers. When the film thickness of the surface functional layer is 5 μm or more, the film thickness after stretching is sufficient and water repellency can be maintained. On the other hand, if the film thickness of the surface functional layer is 50 μm or less, it can be followed at the time of molding, and cracks and the like can be suppressed.

  Thus, the acrylic resin base material on which the surface functional layer is laminated becomes an acrylic resin sheet which is a precursor of the acrylic resin molded product. That is, the acrylic resin sheet is a precursor sheet for a molded product.

  The acrylic resin molded product is obtained by stretching and molding this acrylic resin sheet. That is, at least a part of the acrylic resin sheet is stretched and molded. As the molding method, an appropriate method can be used. For example, the acrylic resin sheet can be molded into a predetermined shape by a thermoforming method such as vacuum molding, pressure molding, vacuum pressure molding, press molding, or the like.

  The draw ratio at the time of molding is preferably 1.2 to 2 times in the biaxial direction perpendicular to the plane of the acrylic resin sheet. When the draw ratio is within this range, moldability is maintained and cracking of the surface functional layer is unlikely to occur.

  In the acrylic resin molded product, the contact angle of water on the surface functional layer side is preferably 90 ° to 120 °. Excellent water repellency can be achieved when the water contact angle is within this range.

In an acrylic resin molded product, in order to achieve both water repellency and conductivity, a conductive metal oxide (B) using e ⁻ (electrons) as a carrier, which can impart conductivity without impairing water repellency. Used. For this reason, it can suppress that water repellency falls like other electroconductivity provision materials.

  Further, when a general spherical metal oxide is used, the conductive path is cut at the time of molding accompanied with stretching, and the surface resistance becomes high. However, in the above-mentioned acrylic resin molded product, the conductivity at the time of stretching can be ensured by using the needle-like conductive metal oxide (B).

  Moreover, in the acrylic resin molded product, the surface functional layer formed of the acrylic resin (A) having a water repellent group is disposed as the outermost layer, and the surface functional layer is not an acrylic resin base material. The conductive metal oxide (B) is blended. For this reason, there is almost no coloring property, it has transparency, and it can use it especially suitably for the use which requires the light transmittance.

  The use of the acrylic resin molded product is not particularly limited, but can be produced by stretching an acrylic resin sheet formed of an acrylic resin, and can be applied to uses requiring water repellency and conductivity. is there. For example, a semiconductor tray or a lighting cover can be used. In particular, the above acrylic resin molded article uses an acrylic resin for both the surface functional layer and the base material, and is excellent in light resistance. Therefore, a lighting cover is suitable.

  In general, a light diffusing agent is often added to a lighting cover in order to diffuse light from a light source. Therefore, it is also preferable to add a light diffusing agent to one or both of the base material and the surface functional layer made of the acrylic resin. As the light diffusing agent, those that can be added to the resin material for the lighting cover can be used.

  As such a light diffusing agent, organic fine particles or inorganic fine particles can be used. Examples of the organic fine particles include cross-linked styrene fine particles, cross-linked or high molecular weight acrylic fine particles, cross-linked styrene-acrylic fine particles, cross-linked styrene-butadiene fine particles, cross-linked silicone fine particles, cross-linked siloxane-based fine particles, cross-linked urethane-based fine particles, and melamine-based fine particles. A polymer etc. are mentioned. Examples of the inorganic fine particles include calcium carbonate, calcium fluoride, potassium fluoride, calcium phosphate, zinc oxide, magnesium sulfate, barium sulfate, titanium oxide, potassium titanate, aluminum hydroxide, magnesium hydroxide, magnesium carbonate, alumina, mica Cerium oxide, magnesium stearate, lithium stearate, calcium stearate, zinc stearate, barium stearate, crystalline silica, amorphous silica, glass flakes, glass fibers, glass beads, clay and the like. Moreover, you may use what performed surface treatment to these inorganic fine particles. These light diffusing agents can be added to the resin material in at least one kind, that is, one kind or a combination of plural kinds. In order to use an acrylic resin molded article as a lighting cover, those capable of imparting appropriate light diffusivity without impairing visible light transmittance are preferred. From such a viewpoint, barium sulfate, calcium carbonate, titanium oxide, cross-linking Silicone fine particles and crosslinked siloxane fine particles are preferred.

  The blending ratio of the light diffusing agent is preferably 0.1 to 15 parts by mass with respect to 100 parts by mass of the solid content of the acrylic resin. When the blending amount of the light diffusing agent is less than 0.1 parts by mass, the concealability is low, and there is a possibility that an appropriate light diffusibility cannot be obtained. In addition, if the blending amount of the light diffusing agent exceeds 15 parts by mass, the color tone of the resin composition and the molded body thereof may become opaque white, which may not be used as a light transmitting member such as a lighting cover. It is not preferable.

  For example, the lighting cover is preferably mounted so as to cover the lamp. At this time, the light emitting unit may be entirely covered or attached, or a part of the light emitting unit may be covered. In order to cover the lamp, it is preferable that the lighting cover is molded by pressing and stretching from the surface of the acrylic resin sheet on the base material side (opposite the surface functional layer). When molded in this manner, the surface functional layer is disposed on the outer surface of the molded product. Moreover, it is preferable that the illumination cover is a type of illumination cover that is milky white and is accompanied by diffusion of light, so that the light from the lamp is softened and the lamp image is softened.

  Therefore, the lighting cover preferably has a total light transmittance of 30% or more, and more preferably has a total light transmittance of 40% or more and 70% or less. If the total light transmittance is 40% or more, the light from the lamp can be moderated moderately without being too dark. Moreover, if the total light transmittance is 70% or less, sufficient brightness can be obtained while light from the lamp can be moderated.

  Such lighting covers include various lighting fixtures such as ceiling lights, pendant lights, sink lights, bathroom lights, chandeliers, stands, brackets, lanterns, garage lights, eaves lights, gatepost lights, porch lights, garden lights, Suitable for entrance lights, step lights, stair lights, guide lights, crime prevention lights, downlights, base lights, illuminated signs, sign lights, covers for vehicles such as automobiles and motorcycles, etc. Can be used. In particular, it can be suitably used for a ceiling light or the like having a structure in which a cover is sandwiched between instrument bodies. This is because the above-mentioned acrylic resin molded product has moderate strength and flexibility, and can be fitted into a portion sandwiched by flexibility while improving impact resistance by strength.

  FIG. 1 shows an example of a lighting fixture A in which the lighting cover 1 is used. This luminaire A is a ceiling-type light having a circular shape in a plan view installed on a ceiling 4 of a house, etc., a lamp 2 serving as a light emitter, a fixture body 3 that holds the lamp 2 and is attached to the ceiling 4, and an acrylic resin And an illumination cover 1 formed of a molded product.

  The illumination cover 1 is formed in a substantially inverted C-shaped cross section (that is, a globe shape), covers the lamp 2, and is attached to the instrument body 3 from below. In the illumination cover 1, a surface functional layer is disposed on the outer surface opposite to the lamp 2. At the upper end portion of the illumination cover 1, an engagement portion 11 for hooking on the instrument body 3 is provided. In the illustrated form, the engaging portion 11 is formed to protrude toward the inside of the circumference. The engaging portion 11 may be provided over the entire circumference of the lighting cover 1 or may be provided in a part of the circumference.

  The fixture body 3 is provided with an engaged portion 31 that engages with the engaging portion 11 of the illumination cover 1. In the illustrated form, the engaged portion 31 is formed to protrude toward the outside of the circumference. In addition, the instrument body 3 is provided with a support portion 32 that protrudes downward from a position outside the instrument body 3 relative to the engaged portion 31. The support portion 32 supports the illumination cover 1 from the outside so that the illumination cover 1 is not displaced or rattled. The engaged portion 31 and the support portion 32 may be provided over the entire circumference of the instrument body 3 or may be provided in a part of the circumference.

  When attaching the illumination cover 1 to the fixture body 3, first, the upper end portion of the illumination cover 1 is inserted inside the support portion 32, and then the engaging portion 11 is engaged with the engaged portion 31 and placed. To do. At this time, for example, a structure in which a part of the engaged portion 31 of the instrument main body 3 is notched larger than the shape of the engaging portion 11 to provide a notched portion may be used. In this case, the engaging portion 11 is inserted from the cutout portion, the lighting cover 1 is pushed into the instrument body 3 side (upward), rotated, and the engaging portion 11 and the engaged portion 31 are engaged and placed. can do. In this way, the illumination cover 1 can be attached to the fixture body 3.

  And in such a lighting cover 1, since the outer surface is a surface functional layer, the low surface energy property such as water repellency and the antistatic property are improved, and the antifouling property is high. . Moreover, light resistance improves by forming with an acrylic resin, and suitable light transmittance is obtained. In the present application, the low surface energy property has been described with a focus on water repellency, but also includes oil repellency.

  Hereinafter, specific examples will be described.

Example 1
100 parts by mass of an acrylic resin having a perfluoroalkyl group as a water repellent group (FS-6130 solid content: 10% by mass) and a needle shape having a major axis of 0.2 to 2 μm and a minor axis of 0.01 to 0.02 μm 70 parts by mass of an antimony-doped tin oxide aqueous dispersion (FS-10D, solid content 20% by mass; water sol, manufactured by Ishihara Sangyo) was added to prepare a paint. The acrylic resin having a perfluoroalkyl group contains, as monomers, a (meth) acrylate monomer having a fluoroalkyl group and a (meth) acrylate monomer having no water repellent group, and these are copolymerized. Is formed. Moreover, the compounding quantity of the conductive metal oxide with respect to 100 mass parts of solid content of an acrylic resin is 140 mass parts.

  This paint was applied to the surface of a 2 mm thick acrylic resin extruded plate (Sumipex ES055 total light transmittance 36%) so that the dry film thickness was 5 μm. As a result, an acrylic resin sheet having a surface functional layer formed on the surface of the substrate was obtained.

  The obtained acrylic resin sheet was cut into a size of 400 mm × 400 mm and molded into a ceiling light glove shape as shown in FIG. 1 using a pressure forming machine. After shaping, the illumination cover was produced by holding at 110 ° C. for 10 minutes in the molding machine mold and then cooling. The draw ratio when the acrylic resin sheet was molded into a glove shape was 1.5 × 1.5 times on average in the biaxial direction perpendicular to the plane.

(Example 2)
100 parts by mass of an acrylic resin having a perfluoroalkyl group as a water repellent group (FS-6130 solid content: 10% by mass) and a needle shape having a major axis of 0.2 to 2 μm and a minor axis of 0.01 to 0.02 μm 10 parts by mass of an antimony-doped tin oxide aqueous dispersion (FS-10D solid content 20 mass%, manufactured by Ishihara Sangyo) was added to prepare a coating material. In addition, the compounding quantity of the electroconductive metal oxide with respect to 100 mass parts of solid content of an acrylic resin is 20 mass parts.

  This paint was applied to the surface of a 2 mm thick acrylic resin extruded plate (Sumipex ES055 total light transmittance 36%) so that the dry film thickness was 5 μm. As a result, an acrylic resin sheet having a surface functional layer formed on the surface of the substrate was obtained.

  The obtained acrylic resin sheet was cut into a size of 400 mm × 400 mm and molded into a ceiling light glove shape as shown in FIG. 1 using a pressure forming machine. After shaping, the illumination cover was produced by holding at 110 ° C. for 10 minutes in the molding machine mold and then cooling. The draw ratio when the acrylic resin sheet was molded into a glove shape was 1.5 × 1.5 times on average in the biaxial direction perpendicular to the plane.

(Example 3)
A needle-shaped antimony-doped tin oxide coating having a major axis of 5.2 μm and a minor axis of 0.27 μm is applied to 100 parts by mass of an acrylic resin having a perfluoroalkyl group as a water repellent group (FS-6130, solid content: 10% by mass). 10 parts by mass of titanium oxide (FT-3000, solid content: 100% by mass) manufactured by Ishihara Sangyo Co., Ltd. was added, and the mixture was stirred for 20 minutes with a 3000 rpm disperser to prepare a paint. In addition, the compounding quantity of the conductive metal oxide with respect to 100 mass parts of solid content of an acrylic resin is 100 mass parts.

  This paint was applied to the surface of a 2 mm thick acrylic resin extruded plate (Sumipex ES055 total light transmittance 36%) so that the dry film thickness was 5 μm. As a result, an acrylic resin sheet having a surface functional layer formed on the surface of the substrate was obtained.

  The obtained acrylic resin sheet was cut into a size of 400 mm × 400 mm and molded into a ceiling light glove shape as shown in FIG. 1 using a pressure forming machine. After shaping, the illumination cover was produced by holding at 110 ° C. for 10 minutes in the molding machine mold and then cooling. The draw ratio when the acrylic resin sheet was molded into a glove shape was 1.5 × 1.5 times on average in the biaxial direction perpendicular to the plane.

Example 4
Acicular antimony having a major axis of 0.2 to 2 μm and a minor axis of 0.01 to 0.02 μm on 22 parts by mass of an acrylic resin having a dimethylsiloxane group as a water repellent group (GS-101, solid content 45% by mass, manufactured by Toagosei Co., Ltd.) A coating material was prepared by adding 70 parts by mass of a methyl ethyl ketone dispersion of dope tin oxide (FSS-10M solid content 20% by mass, manufactured by Ishihara Sangyo). The acrylic resin having a dimethylsiloxane group contains, as monomers, a (meth) acrylate monomer having a dimethylsiloxane group and a (meth) acrylate monomer having no water repellent group, which are copolymerized. It is formed. Moreover, the compounding quantity of the conductive metal oxide with respect to 100 mass parts of solid content of an acrylic resin is 140 mass parts.

  This paint was applied to the surface of a 2 mm thick acrylic resin extruded plate (Sumipex ES055 total light transmittance 36%) so that the dry film thickness was 5 μm. As a result, an acrylic resin sheet having a surface functional layer formed on the surface of the substrate was obtained.

  The obtained acrylic resin sheet was cut into a size of 400 mm × 400 mm and molded into a ceiling light glove shape as shown in FIG. 1 using a pressure forming machine. After shaping, the illumination cover was produced by holding at 110 ° C. for 10 minutes in the molding machine mold and then cooling. The draw ratio when the acrylic resin sheet was molded into a glove shape was 1.5 × 1.5 times on average in the biaxial direction perpendicular to the plane.

(Example 5)
Acicular antimony having a major axis of 0.2 to 2 μm and a minor axis of 0.01 to 0.02 μm on 22 parts by mass of an acrylic resin having a dimethylsiloxane group as a water repellent group (GS-101, solid content 45% by mass, manufactured by Toagosei Co., Ltd.) A coating material was prepared by adding 10 parts by mass of a methyl ethyl ketone dispersion of doped tin oxide (FSS-10M, solid content 20% by mass, manufactured by Ishihara Sangyo). In addition, the compounding quantity of the electroconductive metal oxide with respect to 100 mass parts of solid content of an acrylic resin is 20 mass parts.

  This paint was applied to the surface of a 2 mm thick acrylic resin extruded plate (Sumipex ES055 total light transmittance 36%) so that the dry film thickness was 5 μm. As a result, an acrylic resin sheet having a surface functional layer formed on the surface of the substrate was obtained.

  The obtained acrylic resin sheet was cut into a size of 400 mm × 400 mm and molded into a ceiling light glove shape as shown in FIG. 1 using a pressure forming machine. After shaping, the illumination cover was produced by holding at 110 ° C. for 10 minutes in the molding machine mold and then cooling. The draw ratio when the acrylic resin sheet was molded into a glove shape was 1.5 × 1.5 times on average in the biaxial direction perpendicular to the plane.

(Comparative Example 1)
100 parts by mass of an acrylic resin having a perfluoroalkyl group as a water repellent group (FS-6130 solid content: 10% by mass) and a needle shape having a major axis of 0.2 to 2 μm and a minor axis of 0.01 to 0.02 μm A coating material was prepared by adding 100 parts by mass of an aqueous dispersion of antimony-doped tin oxide (FS-10D, solid content 20% by mass, manufactured by Ishihara Sangyo). In addition, the compounding quantity of the conductive metal oxide with respect to 100 mass parts of solid content of an acrylic resin is 200 mass parts.

  This paint was applied to the surface of a 2 mm thick acrylic resin extruded plate (Sumipex ES055 total light transmittance 36%) so that the dry film thickness was 5 μm. Thus, an acrylic resin sheet having a coating film formed on the substrate was obtained.

  The obtained acrylic resin sheet was cut into a size of 400 mm × 400 mm and molded into a ceiling light glove shape as shown in FIG. 1 using a pressure forming machine. After shaping, the illumination cover was produced by holding at 110 ° C. for 10 minutes in the molding machine mold and then cooling. The draw ratio when the acrylic resin sheet was molded into a glove shape was 1.5 × 1.5 times on average in the biaxial direction perpendicular to the plane.

(Comparative Example 2)
100 parts by mass of an acrylic resin having a perfluoroalkyl group as a water repellent group (FS-6130 solid content: 10% by mass) and a needle shape having a major axis of 0.2 to 2 μm and a minor axis of 0.01 to 0.02 μm 3 parts by mass of an antimony-doped tin oxide aqueous dispersion (FS-10D solid content 20 mass%, manufactured by Ishihara Sangyo) was added to prepare a coating material. In addition, the compounding quantity of the conductive metal oxide with respect to 100 mass parts of solid content of an acrylic resin is 6 mass parts.

  This paint was applied to the surface of a 2 mm thick acrylic resin extruded plate (Sumipex ES055 total light transmittance 36%) so that the dry film thickness was 5 μm. Thus, an acrylic resin sheet having a coating film formed on the substrate was obtained.

  The obtained acrylic resin sheet was cut into a size of 400 mm × 400 mm and molded into a ceiling light glove shape as shown in FIG. 1 using a pressure forming machine. After shaping, the illumination cover was produced by holding at 110 ° C. for 10 minutes in the molding machine mold and then cooling. The draw ratio when the acrylic resin sheet was molded into a glove shape was 1.5 × 1.5 times on average in the biaxial direction perpendicular to the plane.

(Comparative Example 3)
Aqueous dispersion of spherical antimony-doped tin oxide having a particle diameter of 0.01 to 0.1 μm in 100 parts by mass of an acrylic resin having a perfluoroalkyl group as a water repellent group (FS-6130 solid content: 10% by mass) Ishihara Sangyo FN-100D (solid content 30% by mass) 33 parts by mass was added to prepare a paint. In addition, the compounding quantity of the conductive metal oxide with respect to 100 mass parts of solid content of an acrylic resin is 100 mass parts.

  This paint was applied to the surface of a 2 mm thick acrylic resin extruded plate (Sumipex ES055 total light transmittance 36%) so that the dry film thickness was 5 μm. Thus, an acrylic resin sheet having a coating film formed on the substrate was obtained.

  The obtained acrylic resin sheet was cut into a size of 400 mm × 400 mm and molded into a ceiling light glove shape as shown in FIG. 1 using a pressure forming machine. After shaping, the illumination cover was produced by holding at 110 ° C. for 10 minutes in the molding machine mold and then cooling. The draw ratio when the acrylic resin sheet was molded into a glove shape was 1.5 × 1.5 times on average in the biaxial direction perpendicular to the plane.

(Comparative Example 4)
Acrylic resin having a quaternary ammonium group in 200 parts by mass of an acrylic resin having a perfluoroalkyl group as a water repellent group (Fluorosurf FG-4010 manufactured by FluoroTechnology: solid content of 5% by mass) 121X-9 manufactured by Colcoat and having a solid content of 10% by mass %) 10 parts by mass was added to prepare a paint.

  This paint was applied to the surface of a 2 mm thick acrylic resin extruded plate (Sumipex ES055 total light transmittance 36%) so that the dry film thickness was 5 μm. Thus, an acrylic resin sheet having a coating film formed on the substrate was obtained.

  The obtained acrylic resin sheet was cut into a size of 400 mm × 400 mm and molded into a ceiling light glove shape as shown in FIG. 1 using a pressure forming machine. After shaping, the illumination cover was produced by holding at 110 ° C. for 10 minutes in the molding machine mold and then cooling. The draw ratio when the acrylic resin sheet was molded into a glove shape was 1.5 × 1.5 times on average in the biaxial direction perpendicular to the plane.

(Comparative Example 5)
Acrylic resin having a perfluoroalkyl group as a water repellent group (Fluorosurf Fluorosurf FG-4010: solid content 5% by mass) and 200 parts by weight of a cationic surfactant (LDO-made LD-204 solid content 100% by mass) 0.5 parts by mass was added to prepare a paint.

  This paint was applied to the surface of a 2 mm thick acrylic resin extruded plate (Sumipex ES055 total light transmittance 36%) so that the dry film thickness was 5 μm. Thus, an acrylic resin sheet having a coating film formed on the substrate was obtained.

  The obtained acrylic resin sheet was cut into a size of 400 mm × 400 mm and molded into a ceiling light glove shape as shown in FIG. 1 using a pressure forming machine. After shaping, the illumination cover was produced by holding at 110 ° C. for 10 minutes in the molding machine mold and then cooling. The draw ratio when the acrylic resin sheet was molded into a glove shape was 1.5 × 1.5 times on average in the biaxial direction perpendicular to the plane.

(Comparative Example 6)
Acicular antimony having a major axis of 0.2 to 2 μm and a minor axis of 0.01 to 0.02 μm on 20 parts by mass of an acrylic resin having no water repellent group (Acridic A-190 manufactured by DIC: solid content 50% by mass) 40 parts by mass of a doped tin oxide methyl ethyl ketone dispersion (FSS-10M solid content 30% by mass, manufactured by Ishihara Sangyo) was added, and 100 parts by mass of MEK (methyl ethyl ketone) was further added and stirred for 5 minutes to prepare a coating material. In addition, the compounding quantity of the conductive metal oxide with respect to 100 mass parts of solid content of an acrylic resin is 120 mass parts.

  This paint was applied to the surface of a 2 mm thick acrylic resin extruded plate (Sumipex ES055 total light transmittance 36%) so that the dry film thickness was 5 μm. Thus, an acrylic resin sheet having a coating film formed on the substrate was obtained.

  The obtained acrylic resin sheet was cut into a size of 400 mm × 400 mm and molded into a ceiling light glove shape as shown in FIG. 1 using a pressure forming machine. After shaping, the illumination cover was produced by holding at 110 ° C. for 10 minutes in the molding machine mold and then cooling. The draw ratio when the acrylic resin sheet was molded into a glove shape was 1.5 × 1.5 times on average in the biaxial direction perpendicular to the plane.

(Evaluation)
The following items were evaluated for the acrylic resin molded products (lighting covers) obtained in Examples 1 to 5 and Comparative Examples 1 to 6. In addition, about the water contact angle and surface resistance, it evaluated also about the acrylic resin sheet.

(Evaluation method)
(1) (3) Water contact angle The contact angle when water was dropped onto the sample surface was measured with a contact angle meter (DM500) manufactured by Kyowa Interface Science Co., Ltd.
(Criteria)
90 ° or more: ○
Less than 90 °: ×
Judged by.

(2) (4) Surface resistance It measured with the applied voltage of 100V with the surface resistance measuring device made from Dia Instruments (Hiresta UP MCP-HT450 type | mold). This surface resistivity is a value based on JISK 6911-1995.
(Criteria)
Less than 1 × 10 ¹⁴ Ω / □: ○
1 × 10 ¹⁴ Ω / □ or more: ×
Judged by.

(5) Total light transmittance Total light transmittance was measured with a haze meter manufactured by Nippon Denshoku Industries Co., Ltd.
(Criteria)
40% or more: ○
30% or more and less than 40%: △
Less than 30%: ×
Judged by.

(6) Surface hardness The hardness (pencil hardness) of the coating film surface was measured according to JIS K-5600-5-4.
(Criteria)
H or higher: ○
F or less: ×
Judged by.

(result)
The results are shown in Table 1.

  In Comparative Example 1, since the water contact angle was small, the water repellency was not sufficient and the hardness was not sufficient. In Comparative Examples 2 and 3, the surface resistance was high and the antistatic property was not sufficient. In Comparative Example 4, both water repellency and antistatic properties were not sufficient. In Comparative Examples 5 and 6, the water repellency was not sufficient.

  On the other hand, Examples 1 to 5 were excellent in water repellency and antistatic properties, and also had good light transmission and hardness.

A lighting fixture 1 lighting cover 2 lamp 3 fixture body

Claims (3)

A base material made of an acrylic resin contains an acrylic resin (A) having a water repellent group and an acicular conductive metal oxide (B), and the content of the acicular conductive metal oxide (B) is acrylic. Using an acrylic resin molded product obtained by stretching and molding an acrylic resin sheet having a surface functional layer of 10 to 150 parts by mass with respect to 100 parts by mass of the solid content of the resin (A) Lighting cover . 2. The illumination according to claim 1, wherein the water repellent group of the acrylic resin (A) is at least one selected from a dimethylsiloxane group represented by the following formula (1) and a fluoroalkyl group. Cover .

(N represents an integer of 2 or more) The surface of the surface functional layer side has a surface resistivity of 10 ⁷ to 10 ¹³ Ω / □, and a contact angle of water of 90 ° to 120 °. Lighting cover .

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