JP5305157B2 - Optical ceiling film material excellent in prevention of wingworm shadows and its optical ceiling system - Google Patents

Description

  The present invention relates to an optical ceiling film material and an optical ceiling system thereof, and more particularly, has flexibility, high visible light transmittance, moderate light diffusibility, Light diffusing and permeable sheet with anti-scratch property, entrance hall / lounge / partite hall of hotel, large meeting room of office building, ceremonial hall, station building / airport facilities, underground shopping street, large commercial facilities, various public facilities The present invention relates to a laminate used for an optical ceiling lighting shade such as in an elevator car or a railway vehicle, and the optical ceiling system.

  As for lighting in commercial facilities, office buildings, school buildings, etc., it is common to keep indoor brightness and illuminance uniformity by arranging a large number of fluorescent lamp units densely in the vertical and horizontal directions of the ceiling. However, in this method, the presence of the fluorescent lamp unit is conspicuous, which hinders the flexibility of facility space design. Therefore, although fluorescent lamp units are covered with a milky white acrylic resin lighting cover (see, for example, Patent Document 1), and the entire ceiling is protected as a decorative color based on white, it is still fluorescent. It was a difficult task to make the presence of the lamp unit inconspicuous.

  Especially in high-rise hotels, intelligent buildings, station buildings, airports, large commercial facilities, amusement facilities, ceremonial occasions, general hospitals, and various public facilities, lighting designs that do not expose the lighting equipment itself are adopted. In recent newly built facilities, as an illumination means pursuing more sophisticated and brighter space, the introduction of optical ceiling lighting that makes the entire ceiling light by making almost the entire ceiling into a light shade is progressing. As an optical ceiling, a long membrane material made of a textile fabric as a base material is applied to the ceiling on which a fluorescent lamp unit is placed, covering the entire surface with parallel spaces at regular intervals. It is compatible with the durability and workability of objects, and has both a light diffusion effect and a fluorescent lamp concealment effect that are excellent as an illumination shade. Examples of the long membrane material used for the optical ceiling include a composite molded body of a fluororesin sheet and a glass fiber sheet. (Refer to Patent Documents 2 and 3) However, in these optical ceiling systems, attenuation of the light transmission effect due to the inclusion of the fiber fabric and the shadow of the fiber fabric become problems, and therefore it is necessary to arrange many fluorescent lamp units. .

  Especially in large-scale facilities, there are not a few working days and business days throughout the year, so the optical ceiling system in these facilities is mainly maintenance-free. Therefore, over time, small phototactic worms such as chisel mosquitoes and worms enter the space of the optical ceiling system, and the dead bodies fall on the optical ceiling membrane material, and the dead bodies become shadows of fluorescent lighting and light. There is a problem that the appearance and impression are deteriorated by being scattered as foreign matter marks on the ceiling appearance. In particular, in the optical ceiling system, the interior space of the optical ceiling has a high illuminance and an environment close to 30 ° C by arranging many fluorescent lamp units, and therefore has ventilation holes everywhere for releasing heat. In addition, it is inevitable to attract the photocatalytic beetle from the outside. Especially in downtown buildings and large-scale facilities, many restaurants are tenants and invites, so the ventilation holes of these kitchens are open to the outside, which causes attraction of beetles into the buildings. Yes.

  On the optical ceilings of these large-scale facilities, it is difficult to maintain the removal of carcasses of worms, which is a large-scale work at a high place. Therefore, by arranging the net and mesh sheet of the caterpillar of the beetle between the light source and the light ceiling film material (lighting shade), the carcass of the beetle is prevented from touching the light ceiling film material (lighting shade) directly, In this way, a method of blurring the focus caused by the shadow of a dead caterpillar with a wide angle has been proposed. However, this method has a problem that the structure becomes double due to the mesh and mesh sheet, and the cost is high, and the light quantity from the light source is attenuated. Such a device for arranging a dead caterpillar receiver between a light source and an illumination shade has also been proposed for ceiling lighting in an elevator car. (For example, see Patent Documents 4 and 5)

  On the other hand, optical ceiling designs in these large-scale facilities often require removal of tobacco stains and prevention of stains. As an example of the design, an illuminating device using a sheet with a photocatalyst layer has been proposed. (For example, see Patent Document 6)

  Moreover, since it is preferable for fire countermeasures that said optical ceiling film | membrane material has the nonflammability corresponding to a building standard law, for example, the fluororesin sheet | seat and glass fiber like patent document 2, 3 are used for the film | membrane material for optical ceiling systems. A composite molded body with a sheet or a composite sheet in which a glass fiber fabric is impregnated with a thermosetting resin is suitable. However, when these composite molded bodies and sheets are used for the optical ceiling membrane material, there is a problem of foreign matter shadows caused by the dead bodies of the photocatalytic worms straying into the space of the optical ceiling system. In addition to this, a double structure in which a net or film for receiving caterpillars is introduced is not only expensive, but also imposes great inconvenience because it impedes regular maintenance work such as fluorescent lamp replacement. Therefore, it is a film material used for the optical ceiling, has high visible light permeability and moderate light diffusibility, and in particular, alleviates or prevents foreign object shadows caused by the dead bodies of phototactic worms that have entered the optical ceiling system. The optical ceiling membrane material and the optical ceiling system that are capable of being non-flammable have not existed so far.

Japanese Patent Laid-Open No. 11-172019 Japanese Patent Laid-Open No. 08-290528 Japanese Patent Laid-Open No. 2006-212820 JP 2002-087739 A JP 2008-150187 A JP 2006-198466 A

  The present invention is a flexible fiber composite membrane material used for an optical ceiling, has high visible light permeability, has an appropriate light diffusibility, and can be used in an optical ceiling system without using a particularly complicated configuration or apparatus. It is intended to provide a film material for optical ceiling that can alleviate or prevent the shadows of foreign bodies caused by the dead bodies of photocatalytic worms that have penetrated into the space, and its optical ceiling system. The optical ceiling membrane material and the optical ceiling system are provided.

In order to solve the above problems, in a light diffusive and permeable sheet including a composite base material in which a flexible resin layer is provided on one side or more of a woven fabric including stretched filaments. 1. An effect of decomposing larvae can be obtained by providing a layer containing a visible light responsive photocatalytic substance on at least one layer of the light diffusive and transparent sheet. 2. The flexible resin layer has a sea-island structure made of an incompatible mixture of a synthetic resin blend, and either the sea component or the island component contains a colorant. The combination of 1 and 2 above solves the problem of foreign body shadows caused by the dead bodies of photocatalytic worms that have entered the optical ceiling system, and the degradation of the dead bodies of phototactic wingworms is less than 100%. However, the present invention was completed by finding the effect of remarkably relieving the shadow mark of the dead body of the photocatalytic worm by the unique optical characteristics of the flexible resin layer due to the sea-island structure.

That is, the film material for optical ceiling excellent in the prevention of wormworm shadow marks of the present invention is a light diffusive transmittance including a composite base material in which a flexible resin layer is provided on one side or more of a woven fabric including a stretched filament. A larvae carcass decomposition layer containing a visible light responsive photocatalytic substance is provided on at least one layer of the light diffusive and transparent sheet, and the flexible resin layer is formed of a non-colored synthetic resin. It is preferable to have a sea-island structure composed of an incompatible mixture by a synthetic resin blend with a colored synthetic resin, and in the sea-island structure, only the island component contains white fine particles composed of an inorganic compound as a colorant . The film material for optical ceiling having excellent anti-feather shadow effect of the present invention is such that the photocatalytic substance is a cocatalyst-added (supported) photocatalyst, anion-doped photocatalyst, cation-doped photocatalyst, co-doped photocatalyst, metal halogen One or more selected from a fluoride-supporting photocatalyst and an oxygen-deficient photocatalyst are preferred. In the optical ceiling film material having excellent anti-feather shadow effect of the present invention, it is preferable that the colorant contains white fine particles composed of at least an inorganic compound. The film material for optical ceiling excellent in the prevention property of the worm beetle shadow of the present invention is the unevenness having a surface roughness Rz value (JIS-B0601) of 10 to 200 μm on the surface of the larvae carcass decomposition layer forming surface in the light diffusive transparent sheet. It is preferable that the average interval Sm value (JIS-B0601) of the unevenness is 0.1 to 3 mm. In the optical ceiling film material having excellent anti-cataract shadow property of the present invention, the stretched filament has a stretching direction a and a stretching vertical direction b with respect to the stretching direction a, and the flexible resin layer The absolute value | n1-na | of the difference between the refractive index n1 and the refractive index na in the drawing direction of the drawn filament satisfies the following formula 1, and the refractive index n1 of the flexible resin layer and the drawing vertical direction b It is preferable that the absolute value | n1−nb | of the difference from the refractive index nb of the above has optical characteristics satisfying the following formula 2.
0 <| n1-na | ≦ 0.2 Formula 1
| N1-nb | ≦ 0.2 Formula 2
The film material for optical ceiling excellent in the prevention of worm shadow shadows according to the present invention is a radiant electric heat for the light diffusive transparent sheet in the cone calorimeter test method (ASTM-E1354). When radiant heat from a heater is applied at 50 kW / m ² , the total calorific value for 20 minutes after the start of heating is 8 MJ / m ² or less, and for 20 minutes after the start of heating, the maximum heat generation rate continues for 10 seconds or more. It preferably has non-flammable properties that do not exceed 200 kW / m ² .
The optical ceiling system excellent in preventing wormworm shadow marks according to the present invention uses a light diffusing transparent sheet including a composite base material in which a flexible resin layer is provided on one side or more of a woven fabric including stretched filaments. A light ceiling structure in which a fluorescent lamp is disposed on the back surface of the light diffusive and transmissive sheet as a ceiling membrane material, and at least on the side of the light diffusible and transmissive sheet facing the fluorescent lamp, visible light A larvae carcass decomposition layer containing a responsive photocatalytic substance is provided, and the flexible resin layer has a sea-island structure composed of an incompatible mixture of a synthetic resin blend of a non -colored synthetic resin and a colored synthetic resin. Furthermore, in the sea-island structure, it is preferable that only the island component contains white fine particles made of an inorganic compound as a colorant . In the optical ceiling system excellent in preventing worm shadow shadows according to the present invention, the photocatalytic substance comprises a cocatalyst-added (supported) photocatalyst, an anion-doped photocatalyst, a cation-doped photocatalyst, a co-doped photocatalyst, and a metal halide supported It is preferable that it is 1 or more types selected from a type photocatalyst and an oxygen deficient type photocatalyst. In the optical ceiling system excellent in the prevention of beetle shadow marks according to the present invention, it is preferable that the colorant includes white fine particles made of at least an inorganic compound. The optical ceiling system excellent in preventing worm shadow shadows according to the present invention has a surface roughness Rz value (JIS-B0601) having a surface roughness Rz value (JIS-B0601) of 10 to 200 μm on the light diffusive transparent sheet. And it is preferable that it is 0.1-3 mm of average space | interval Sm values (JIS-B0601) of an unevenness | corrugation. In the optical ceiling system excellent in the prevention of worm shadow shadows according to the present invention, the stretched filament has a stretching direction a and a stretching vertical direction b with respect to the stretching direction a, and the refractive index of the flexible resin layer. The absolute value | n1-na | of the difference between n1 and the refractive index na in the drawing direction of the drawn filament satisfies the following formula 1, and the refractive index n1 of the flexible resin layer and the refraction in the drawing vertical direction b It is preferable that the absolute value | n1−nb | of the difference from the rate nb has optical characteristics satisfying the following formula 2.
0 <| n1-na | ≦ 0.2 Formula 1
| N1-nb | ≦ 0.2 Formula 2
The optical ceiling system excellent in the prevention of worm shadow shadows according to the present invention is a radiant electric heater with respect to the light diffusive transparent sheet in the light diffusible transparent sheet in the cone calorimeter test method (ASTM-E1354). When the radiant heat is irradiated at 50 kW / m ² , the total calorific value for 20 minutes after the start of heating is 8 MJ / m ² or less, and for 20 minutes after the start of heating, the maximum heat generation rate is 200 kW / it is preferred to have a non-combustible properties not exceeding m ^2.

  According to the present invention, it is a flexible fiber composite film material that can be suitably used for optical ceiling applications, has high visible light permeability and moderate light diffusibility, and has particularly infiltrated into the optical ceiling system. It is possible to provide an optical ceiling film material that can relieve or prevent foreign matter shadows caused by the dead bodies of photocatalytic worms, and an optical ceiling system thereof. The optical ceiling membrane material of the present invention and the optical ceiling system have unique optical characteristics of the flexible fiber composite membrane material even when the degradation of the photocatalytic worms that have entered the optical ceiling system is less than 100%. Because it has the effect of remarkably relieving the shadow marks of the dead bodies of photocatalytic beetles, the entrance hall, lounge and party hall of the hotel, large office building meeting room, ceremonial hall, station building, airport facilities, underground passage It can be widely used in light ceiling lighting shades such as large commercial facilities, various public facilities, elevator cars, and railway vehicles. Furthermore, in the present invention, it is also possible to provide a film material for optical ceiling having nonflammability and an optical ceiling system for fire countermeasures.

Drawing showing drawing direction and drawing vertical direction of drawn filament (a) Drawing direction a (b) Drawing vertical direction b The figure which shows an example of the light-diffusion transparent sheet of this invention The figure which shows an example of the optical ceiling system of this invention The figure which shows the structure at the time of evaluating the function as an optical ceiling in an Example and a comparative example The figure which shows the structure at the time of evaluating the decomposability | degradability of a worm in an Example and a comparative example The figure which shows the sea island structure of a flexible resin layer, and shows the state in which an island component contains a coloring agent The figure which shows the sea island structure of a flexible resin layer, and shows the state in which a sea component contains a coloring agent

  The membrane material for optical ceiling of the present invention is a light diffusive and permeable sheet comprising a composite base material in which a flexible resin layer is provided on one side or more of a woven fabric comprising stretched filaments. A beetle carcass decomposition layer containing a visible light responsive photocatalytic substance is provided on at least one layer of the adhesive sheet, and the flexible resin layer has a sea-island structure composed of an incompatible mixture of a synthetic resin blend, Either the sea component or the island component contains a colorant. In addition, the optical ceiling membrane material system of the present invention uses the membrane material as an optical ceiling membrane material, and covers the ceiling on which the fluorescent lamp unit is arranged by providing a parallel space with a constant space on the entire surface. Thus, at least a light-transmitting sheet surface facing the fluorescent lamp is provided with a beetle carcass decomposition layer containing a visible light responsive photocatalytic substance.

  In the optical ceiling membrane material of the present invention, the drawn filaments used in the woven fabric are long fibers made of synthetic fibers such as polypropylene fibers, polyethylene fibers, polyester fibers, nylon fibers, vinylon fibers, acrylic fibers, diacetate fibers, and triacetates. Long fibers made of semi-synthetic fibers such as fibers, recycled fibers such as rayon fibers and polynosic fibers, and long fibers made of inorganic fibers such as glass fibers, silica fibers, and alumina fibers. Also good. The drawn filament is preferably a multifilament yarn or a monofilament yarn. In the present invention, a multifilament yarn having 3 to 300 filaments and a fineness of 138 to 2223 dtex (decitex), particularly 277 to 1112 dtex is preferred. Stretched filaments are melt-spun unstretched long fiber spinning yarns that are stretched 3.0 to 5.0 times by heat stretching or cold stretching near room temperature, and the fiber microstructure is aligned and crystallized. It is. These stretched filaments have a stretching direction a as shown in FIG. 1A and a stretched vertical direction b with respect to the stretching direction as shown in FIG. Here, in the case of synthetic fiber, semi-synthetic fiber, and regenerated fiber as the drawn filament, the refractive index na in the drawing direction a and the refractive index nb in the drawing vertical direction b are obtained by arbitrarily orienting the crystal structure of the polymer by drawing. Can be adjusted as appropriate. When an amorphous inorganic material such as glass fiber is used, na and nb are equal.

  A woven fabric or a knitted fabric is used for the knitted fabric used in the present invention, and examples of the woven fabric include known woven fabrics such as plain weave, twill weave, satin weave and imitation weave. It is preferable because of excellent balance of the physical properties of the optical ceiling film material to be obtained. As the knitted fabric, Russell knitted weft insertion tricot is preferably used. These knitted fabrics are coarse knitted fabrics comprising a plurality of warp yarns in which a large number of inter-gap gaps are arranged in parallel and a weft in which a large number of inter-gap gaps are arranged in parallel in a uniform manner (porosity 5-50%). And non-coarse knitted fabric (porosity less than 5%). Among these, a high-density knitted fabric having a porosity of 0 to 5% formed between the interlaces of the warp and weft yarns is particularly preferably used from the viewpoints of the reinforcing effect and the light diffusion effect. The woven fabric may be subjected to scouring or heat treatment to remove the adhering oil or glue, in order to make it easy to get wet with the flexible resin processing liquid and to improve the adhesion with the flexible fat layer. Corona discharge treatment, plasma discharge treatment, silane coupling agent treatment, and the like may be performed.

  In the optical ceiling film material of the present invention, the flexible resin layer is molded by a known processing method by melting a synthetic resin blend or stirring a liquid synthetic resin in a synthetic resin blend. Synthetic resins preferably used in the present invention include, for example, vinyl chloride resins, vinyl chloride copolymer resins, olefin resins (PE, PP, etc.), olefin copolymer resins, urethane resins, urethane copolymer resins. , Acrylic resin, acrylic copolymer resin, vinyl acetate resin, vinyl acetate copolymer resin, styrene resin, styrene copolymer resin, polyester resin (PET, PEN, PBT, etc.), polyester copolymer resin , Fluorine-containing copolymer resins, silicone resins, silicone rubbers, polycarbonates, polyamides, polyethers, polyester amides, polyphenylene sulfides, polyether esters and other thermoplastic resins, and vinyl ester resins.

  In this invention, a flexible resin layer consists of an incompatible mixture by a synthetic resin blend, and if it is incompatible, there will be no restriction | limiting in the combination of a synthetic resin. Examples of incompatible combinations include vinyl chloride resin and polyethylene, vinyl chloride resin and polypropylene, vinyl chloride resin and polystyrene, vinyl chloride resin and silicone resin, vinyl chloride resin and fluorine-containing copolymer resin, polystyrene and polyethylene, polystyrene Two types of synthetic resins, including polypropylene and urethane, urethane resin and polyethylene, urethane resin and polypropylene, polyester resin and polyethylene, polyester resin and polypropylene, polyamide and polycarbonate, acrylic resin and polystyrene, acrylic resin and polycarbonate, polyamide and polystyrene, polyamide and polypropylene Is preferred. Another type of thermoplastic resin can also be contained with respect to these incompatible thermoplastic resin pairs.

  These incompatible mixtures are preferably sea-island structures with a cloudy appearance showing a phase separation structure. In this sea-island structure, the sea component and the island component are composed of different types of resins. For example, in an incompatible mixture composed of the thermoplastic resin A and the thermoplastic resin B, the ratio of the thermoplastic resin A and the thermoplastic resin B is set. The sea component can be composed of the thermoplastic resin A, the island component can be composed of the thermoplastic resin B, the sea component can be composed of the thermoplastic resin B, and the island component can be composed of the thermoplastic resin A. it can. The ratio of the resin constituting the island component is 10 to 70% by volume (preferably 20 to 50% by volume) with respect to the volume of the resin constituting the sea component, and the island component content is 9 to 9% with respect to the entire flexible resin layer. 41.1% by volume (preferably 16.6 to 33.3% by volume). In addition, when another type of thermoplastic resin C is contained with respect to the incompatible thermoplastic resin pair AB, the island component is an island component by the thermoplastic resin B and an island component by the thermoplastic resin C in the sea-island structure. Similarly, the island component may be composed of an island component made of the thermoplastic resin A and an island component made of the thermoplastic resin C.

  The shape of the island component is spherical, distorted spherical, meteorite, rugby ball or the like. The average particle size of the island component is 0.1 to 50 μm, and particularly preferably 0.1 to 30 μm. By making the size of the island component larger than 0.1 μm, a good light diffusion effect can be obtained while maintaining the total light transmittance in the flexible resin layer. In the present invention, the flexible resin layer preferably has a difference in refractive index between the synthetic resin constituting the sea component and the synthetic resin constituting the island component. If the refractive indexes are the same, the refractive scattering phenomenon does not occur at the interface between the sea component and the island component, and a sufficient light diffusion effect cannot be obtained. The refractive index difference for obtaining good light diffusibility is 0.01 or more, more preferably 0.05 or more, and the condition constituting the refractive index difference is the refractive index on either side of the sea component and the island component. Can be high. The refractive index can be obtained by an Abbe refractometer using the D line as a light source.

In the present invention, the flexible resin layer has a sea-island structure made of an incompatible mixture of two types of synthetic resins, and the island component contains a colorant in the sea-island structure. In order to color the island component including the colorant , either one of the two types of synthetic resins constituting the incompatible mixture is colored in advance, and the colored sea is obtained by melt-mixing the non-colored synthetic resin and the colored synthetic resin. The structure by a component and a non-colored island component, or the structure by a non-colored sea component and a colored island component can be obtained. In the mixture of the present invention, the colored synthetic resin component does not mix with the non-compatible non-colored synthetic resin component, so the non-colored synthetic resin component is not colored by the colorant contained in the colored synthetic resin component. . The coloring agent that colors the sea component or the island component diffuses the light of the fluorescent lamp, and has an effect of making the traces of the wingworm carcass (including the state during the decomposition by the wingworm carcass decomposition layer) inconspicuous. In the optical ceiling film material of the present invention, the island component is preferably colored in the flexible resin layer. In the optical ceiling film material of the present invention, the flexible resin layer is colored with island components , thereby improving the light diffusion effect of a light source such as a fluorescent lamp and at the same time ensuring good light transmittance. Therefore, the ceiling lighting with higher brightness and colorfulness is possible.

The colorant used for coloring the island component is effective to alleviate or prevent foreign matter shadows caused by carcasses of the beetles to contain at least white fine particles of inorganic compounds. Examples of the white fine particles include metal oxides, metal hydroxides, metal composite oxides, metal composite hydroxides, and the like. Specifically, these include aluminum oxide, magnesium oxide, barium oxide, titanium oxide, zinc oxide, and oxide. Metal oxides such as tin, zirconium oxide, molybdenum oxide, antimony oxide, silicon oxide (silica), and metal composites such as zinc borate, zinc metaborate, barium metaborate, aluminum borate, potassium titanate, zirconium-antimony An oxide etc. are mentioned. Also, metal hydroxides such as aluminum hydroxide, magnesium hydroxide, calcium hydroxide, barium hydroxide, zirconium hydroxide, basic magnesium carbonate, and hydrates of dolomite, hydrotalcite, zinc hydroxystannate, tin oxide And metal composite hydroxides such as borax, and other white fine particles include barium sulfate, calcium carbonate, talc, clay, montmorillonite, and bentonite. The particle diameter of these white fine particles is preferably 0.25 to 10 μm.

  In the optical ceiling sheet of the present invention, the flexible resin layer may contain a known additive as required. Examples of the additive include an antistatic agent, a flame retardant, a plasticizer, a flexibility imparting agent, a filler, an adhesive, a crosslinking agent, an ultraviolet absorber, an antioxidant, a stabilizer, a leveling agent, an antifoaming agent, Antibacterial agents, antifungal agents, colorants, fluorescent whitening agents, fluorescent pigments, phosphorescent pigments and the like can be mentioned.

In the present invention, the flexible resin layer has a uniform overall thickness of 0.05 to 1.0 mm, preferably 0.1 to 0.5 mm. The colorant content contained in the island component is 0.1 to 30% by mass, preferably 0.5 to 10% by mass with respect to the synthetic resin constituting the island component . If the addition amount is less than 0.1% by mass, the light diffusing effect is insufficient, and the traces of the wingworm carcasses (including the state during the decomposition by the wingworm carcass decomposition layer) may be noticeable. On the other hand, if the addition amount exceeds 30 parts by mass, the visible light transmittance may be reduced, and sufficient illuminance as an optical ceiling may not be obtained. In particular, when the island component contains a colorant, the ratio of the island component is 10 to 70% by volume (preferably 20 to 50% by volume) with respect to the sea component, and the island component content with respect to the entire flexible resin layer is It is 9-41.1 volume% (preferably 16.6-33.3 volume%).

  Examples of the method for providing the flexible resin layer on the woven fabric in the present invention include a resin incompatible mixture dispersed in an organic solvent, a resin emulsion (latex) incompatible mixture, a resin dispersion incompatible mixture, a soft Using a paste sol incompatible mixture mainly composed of polyvinyl chloride resin, an incompatible mixture mainly composed of thermosetting resin, etc., known coating methods such as dipping (double-sided processing on woven fabric), coating Examples of the coating include (single-sided processing or double-sided processing on a fiber fabric). Also, a method of laminating a 0.05-1.0 mm film or sheet made of an incompatible thermoplastic mixture, formed by calender molding, T-die extrusion method on a woven fabric, through an adhesive or by thermal lamination, And the combination of these coating and lamination can be illustrated. At this time, the absolute value | n1-na | of the difference between the refractive index n1 of at least the flexible resin layer directly laminated on the woven fabric and the refractive index na in the drawing direction of the drawn filament is 0 <| n1-na | ≦ 0.2, and the absolute value | n1-nb | of the difference between the refractive index n1 of the flexible resin layer and the refractive index nb in the drawing vertical direction of the drawn filament is | n1-nb | ≦ 0.2 It is preferable to appropriately select the flexible resin and the drawn filament so as to satisfy the above.

  In the film material for optical ceiling of the present invention, a beetle carcass decomposing layer containing a visible light responsive photocatalyst is provided on at least one layer of the light diffusive transparent sheet with a layer thickness of 1 to 10 μm, preferably 1 to 5 μm. That is, in the case of a composite base material provided with a flexible resin layer on one side of a knitted fabric, the caterpillar carcass decomposition layer is i). On the flexible resin layer, ii). On woven fabric, iii). The larvae carcass decomposition layer in the case of a composite substrate formed in any form of a flexible resin layer and a woven fabric and provided with a flexible resin layer on both sides of the woven fabric is iv). Only on one flexible resin layer, v). In the optical ceiling system of the present invention, the surface facing the fluorescent lamp is a larvae carcass decomposition layer forming surface. In these light diffusive and transparent sheets, the beetle carcass decomposition layer forming surface has irregularities with a surface roughness Rz value (JIS-B0601) of 10 to 200 μm and an average interval Sm value of irregularities (JIS-B0601) of 0.1. By satisfying ˜3 mm, the surface area per unit area of the caterpillar carcass decomposition layer increases, and the effective amount of the visible light responsive photocatalyst contained in the caterpillar carcass decomposition layer also increases, thereby improving the caterpillar carcass decomposition efficiency. . At the same time, there is a surface roughness Rz value (JIS-B0601) having an unevenness of 10 to 200 μm and a surface roughness satisfying an average interval Sm value (JIS-B0601) of 0.1 to 3 mm. By providing a minute space between the layers, the decomposition efficiency of the carcass carcass can be improved. Such surface roughness unevenness can be provided by a known embossing method. In the case of ii), the unevenness of the woven structure of the knitted fabric can be used as it is.

  By the caterpillar carcass decomposition layer in the present invention, the photocatalytic action of the caterpillar worms such as worms and feather ants having a body length of about 1 to 15 mm is decomposed by at least 50% by mass with respect to the carcass mass within one year. It is preferable that it is possible. If the wingworm carcass decomposition and removal rate is 50% by mass or more, even if wings such as worms or ants remain, the optical properties of the light diffusive transparent sheet of the present invention, and further provided in the wingworm carcass decomposition layer The surface roughness Rz value (JIS-B0601) is 10 to 200 μm, and the average interval Sm value (JIS-B0601) of the unevenness is 0.1 to 3 mm. It becomes possible enough.

  As the visible light responsive photocatalyst, any photocatalytic substance that exhibits activity by absorbing visible light having a wavelength of 400 nm to 800 nm can be used without particular limitation. As photocatalytic substances that absorb visible light and show activity, (1). Conventionally known metal oxides such as titanium oxide, tungsten oxide, iron oxide, zinc oxide, indium oxide, vanadium oxide, bismuth oxide, iron-tungsten oxide, silver, platinum, gold, copper, rhodium, palladium, ruthenium, A cocatalyst-added (supported) type photocatalyst added with (supported) a metal such as iridium and a compound of these metals as a cocatalyst has high activity for visible light, and is more preferably used. In addition, (2). An anion-doped photocatalyst obtained by doping the above-mentioned photocatalytic metal oxide with nitrogen, carbon, sulfur, phosphorus, boron, fluorine or the like; (3). A cation-doped photocatalyst obtained by doping the above-mentioned photocatalytic metal oxide with a transition metal ion such as chromium, niobium, manganese, cobalt, vanadium, iron, nickel, etc. (4). A co-doped photocatalyst doped with both an anion and a cation, (5). A metal halide-supported photocatalyst in which a halide of a noble metal such as platinum, palladium, or rhodium is supported, (6). An oxygen deficient photocatalyst obtained by partially extracting oxygen from the photocatalytic metal oxide can be preferably used. The visible light responsive photocatalyst can be selected from the above, or can be selected and used in combination of two or more.

  Examples of the method for forming a carcass decomposition layer include a method of forming a caterpillar carcass decomposition layer containing a photocatalyst by applying a coating agent containing visible light responsive photocatalyst particles or sol and a binder. Formed by a conventionally known method, such as a method for forming a caterpillar carcass decomposition layer containing a photocatalyst from a solution, a method for forming a caterpillar carcass decomposition layer containing a photocatalyst by a sputtering method, an ion plating method, a CVD method, etc. can do. As such a binder, it is difficult to be decomposed by a photocatalyst and has a film forming ability, for example, an organic binder such as fluorine resin, silicone resin, acrylic fluorine copolymer resin, acrylic silicone copolymer resin, For example, it is preferably a silicon compound condensation layer composed of at least one of polysilazane, an organic silicate compound, or a hydrolyzate (silanol group-containing silane compound) of a low condensate thereof, and further includes silica sol, alumina sol, titanium sol. It is preferable to include any one or more of them. It is preferable that the beetle carcass decomposition layer contains 10 to 70% by mass, particularly 20 to 60% by mass of the visible light responsive photocatalyst particles or sol.

  Between the flexible resin layer and the larvae carcass decomposition layer, if necessary, an adhesive layer for imparting adhesiveness between the flexible resin layer and the larvae carcass decomposition layer, to prevent the resin from being decomposed by the photocatalyst A protective layer, an additive migration preventing layer for preventing the additive contained in the flexible resin layer from migrating to the caterpillar carcass decomposition layer, and the like may be formed. Also, on the surface opposite to the surface on which the caterpillar carcass decomposition layer is formed, roll a scratch-preventing layer to prevent the surface of the membrane material from being scratched, an anti-stain layer to prevent the surface from being soiled, and an optical ceiling membrane material. Prevention of additive migration to prevent the additive contained in the flexible resin layer on the opposite side from moving onto the larvae carcass decomposition layer and lowering the photocatalytic property during storage A layer, a printed layer for imparting design properties, and the like may be formed by a conventionally known method.

  The optical ceiling film material of the present invention is preferably a light diffusive transparent sheet having a visible light transmittance (JIS-Z8722) of 40 to 90%, particularly preferably 40 to 70%. If the visible light transmittance is less than 40%, it may not be possible to obtain sufficient illuminance as illumination when used for an optical ceiling, and if it exceeds 90%, not only the presence of a light source will be noticeable, but also worms Traces of scattered corpses (including those in the process of being decomposed by the larvae decomposition layer) may be noticeable.

  The optical ceiling system of the present invention is an optical ceiling structure in which the above-described light diffusive and transparent sheet having visible light transmittance is used as a film material for optical ceiling, and a light source such as a fluorescent lamp is disposed on the back surface thereof. In the light diffusive and transparent sheet, at least the face facing the fluorescent lamp is provided with a beetle carcass decomposition layer containing a visible light responsive photocatalytic substance, so that the insect carcasses that have entered the light ceiling structure It is possible to make the shadow traces of the dead caterpillars less visible and less noticeable due to the optical properties of the light diffusive and transparent sheet. As a result, the maintenance burden can be greatly reduced.

  With respect to the optical ceiling film material of the present invention, the light diffusive and transparent sheet of FIG. 2 will be described as an example. The light diffusive and transparent sheet of FIG. 2 uses a plain woven fabric as the knitted fabric (1), and the resin processing liquid is dip processed to form the flexible resin layers (2) on both sides of the woven fabric. On one side, a wingworm carcass decomposition layer (3) containing a visible light responsive photocatalytic substance is provided.

FIG. 3 shows an example of the optical ceiling system of the present invention. The optical ceiling film material preferably has flame retardancy or non-flammability as stipulated in the Building Standards Act, and specifically, exothermicity to radiate 50 kW / m ² of radiant heat using a radiant electric heater. In the test (ASTM-E1354: corn calorimeter test method), the total calorific value for 20 minutes after the start of heating is 8 MJ / m ² or less, and the maximum heat generation rate continues for 200 seconds or more for 20 minutes after the start of heating. / M ² is preferably a light diffusive and transparent sheet having non-flammability that does not exceed. Such a non-flammable light diffusive and transparent sheet (4) is made of a glass fiber woven fabric (non-sealed plain weave with a basis weight of 200 to 300 g / m ² and a porosity of 1% or less) as a base material. It is obtained by providing a flexible resin layer on the floor, especially high-rise hotels, intelligent buildings, station buildings, airports, station buildings, underground shopping streets, large commercial facilities, amusement facilities, ceremonial occasions, general hospitals, and various public facilities It can be used suitably for ceilings of large areas, etc., and can also be used for ceilings in elevator cars and railcars. The optical ceiling film material may be used on the entire surface of the ceiling, or may be used only on a desired portion. A fluorescent lamp (5) is disposed on the back surface of the light diffusive and transparent sheet (4). The fluorescent lamp is not particularly limited as long as it is a fluorescent lamp for illumination that emits light having a wavelength of 400 nm to 800 nm, and a fluorescent lamp using LEDs can also be used. Fluorescent lamps for illumination can be used in any form of three-wavelength fluorescent lamps, high color rendering fluorescent lamps, and general fluorescent lamps, and their color temperatures are daylight (5700K-7100K) and daylight white (4600K-5400K). Any type, such as white (3900K to 4500K), warm white (3200K to 3700K), and light bulb color (2600K to 3150K), may be used. The shape of the ceiling is not limited to a flat shape as shown in FIG. 3, but may be a curved ceiling such as an arch shape or a dome shape.

EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated concretely, this invention is not limited to these.
In the following examples and comparative examples, the following base fabric was used as the woven fabric. The dimensions of the base fabric were all warp (warp direction) 150 cm × weft (weft direction) 150 cm.
(Base fabric 1)
Glass fiber having a melt-drawn filament diameter of 9 μm / 750 dtex (na and nb:
Glass fiber plain weave fabric using 1.556) Woven density Warp (warp) 40 / inch Weft (weft) 30 / inch Scouring (heat cleaning)
Silane coupling treatment Methacryloxypropyltrimethoxysilane (Toray Dow Corning Z6030)
(Base fabric 2)
Stretched nylon 333 dtex multifilament (na: 1.578,
Plain weave fabric using nb: 1.522) Density Warp (warp) 40 / inch Weft (weft) 30 / inch (Base fabric 3)
Plain weave fabric using stretched polypropylene 278 dtex multifilament (na: 1.530, nb: 1.496) Density Warp (warp) 40 / inch Weft (weft) 30 / inch (base 4)
Glass fiber plain woven fabric using glass fibers (na and nb: 1.524) having a melt-drawn filament diameter of 9 μm / 750 dtex and a refractive index different from that of the base fabric 1 Density warp (warp) 40 / inch weft (weft) 30 Book / inch Scouring (heat cleaning)
Silane coupling treatment Methacryloxypropyltrimethoxysilane (Toray Dow Corning Z6030)

  An optical ceiling model as shown in FIG. 4 is prepared for the optical ceiling film material (light diffusive transparent sheet) prepared in the examples and comparative examples, and the visibility of the fluorescent lamp, the illuminance, and the shadow of the drawn filament are evaluated as follows. Went. The size of the light diffusing and transmitting sheet (4) used for the light ceiling is 150 cm long × 150 cm wide, and the larvae carcass decomposition layer (3) side of the light diffusing and transmitting sheet (4) is attached facing the fluorescent lamp. The surface of the light diffusing and transmissive sheet (4) is 3m high from the floor, and six parallel 36-watt 40-type daylight white fluorescent lamps (5) are paralleled on the back. Were evenly arranged at intervals of 25 cm and evaluated in a lighted state. In FIG. 4, expressions of elements other than the light diffusive and transmissive sheet and the fluorescent lamp (fluorescent lamp fixture, housing, power supply, wiring, etc.) are omitted.

<Visibility of fluorescent lamp on the back>
Observe from a position 1 m away from the bottom at an angle perpendicular to the surface of the light diffusive and transparent sheet,
Evaluation was made according to the following criteria.
1: The entire surface of the light diffusing and transmitting sheet shines almost uniformly, the fluorescent lamp is hardly visible, and the position is unknown. 2: The fluorescent lamp is not visible, but the brightness of the surface of the light diffusing and transmitting sheet is slightly uneven.
The position of the fluorescent lamp can also be roughly determined. 3: The fluorescent lamp can be visually recognized through the light diffusing and transmitting sheet.
The illuminance was measured using an illuminometer IM-2D (Irie Co., Ltd.) at a position 2 m directly below the center of the light diffusive transparent sheet.
<Shading of drawn filament>
From below, it was observed at a position 1 m away from the sheet surface at an angle perpendicular to the sheet surface, and the presence or absence of shadows due to the stretched filament was evaluated as follows.
1: The shadow of the stretched filament is hardly visible 2: The presence of the base fabric is noticeable due to the shadow of the stretched filament <Sheet surface roughness Rz value: JIS-B0601>
In the part where only the reference length is extracted from the roughness curve of the cross section of the light diffusive transparent sheet, the average value of the altitude of the top from the highest to the fifth and the average of the altitude of the bottom from the deepest to the fifth The difference value was determined.
<Average spacing Sm value of sheet surface irregularities: JIS-B0601>
In the part where only the reference length is extracted from the roughness curve of the cross section of the light diffusive and transparent sheet, 1
The sum of the lengths of the average lines corresponding to two peaks and one valley adjacent thereto was obtained as an average value.
<Degradability of larvae of worms and prevention of wormworm shadows>
Place the light diffusive transparent sheet (4) on the bottom of a transparent acrylic box with an inner size of 50cm wide x 20cm high x 20cm deep with the caterpillar carcass decomposition layer (3) side up. Three dead mosquito corpses (8) with a body length of 5 mm are placed at 10 cm intervals, and a 15-watt 15-inch straight tube 3-wavelength daylight fluorescent lamp is placed at a position 10 cm from the light diffusive transmission sheet as shown in FIG. One was placed. The fluorescent lamp was turned on for 16 hours per day, the state was confirmed after 30 days and after 60 days, and evaluated as follows.
1: Decomposition of chironomid mosquitoes was decomposed to such an extent that it could not be confirmed. 2: Degradation of chironomid mosquitoes was not completely decomposed, but more than 50 mass% was decomposed. It was complete, and more than 50% by mass remained. 4: Decomposition of chironomid mosquitoes was incomplete, only destruction of the body 5: chiseled chironomid mosquitoes were not decomposed and remained in their original form In addition, immediately after the start of the test, after 30 days and 60 days have passed, the fluorescent lamp is turned on, and from the position 1 m below the bottom side of the box at an angle perpendicular to the sheet surface from below. Observation was made as to whether or not the traces of pickpocket mosquitoes were visible and evaluated as follows.
1: The shadow mark was not visible or inconspicuous 2: The shadow mark was clearly visible Note that the internal pressure was kept higher than the outside by sending air to the box with a fan through the filter, and wiring of the fluorescent lamp In addition to preventing other insects from invading through the holes for holes and the gaps in the box, the temperature rise inside the box was suppressed. In FIG. 5, the expressions for wiring, fluorescent lamp fixtures, fans, boxes, etc. are omitted.
<Visible light transmittance>
The visible light transmittance of the light diffusive transmissive sheet was measured according to JIS-Z8722 using a spectroscopic colorimeter CM-3600d (manufactured by Konica Minolta Co., Ltd.).
<Combustion test> (ASTM-E1354: Corn calorimeter test method)
Radiant heat of 50 kW / m ^{2 from} a radiant electric heater is applied to the optical ceiling membrane material for 20 minutes. In this exothermic test, the total calorific value and rate of heat generation for 20 minutes are measured, and the appearance of the membrane material after the test is observed. did.
(A) Total calorific value: 8 MJ / m ² or less was regarded as suitable.
(B) heating speed: 10 seconds or more continuously to the Relevant not exceed 200 kW / ^{m 2.}
(C) Appearance observation: Applicable to those with no pinhole depression exceeding 0.5 mm in diameter.

[Example 1]
Add the black colored vinyl ester resin stirred mixture of the following formulation 2 to the stirred mixture of the soft vinyl chloride resin paste of the following formulation 1 with respect to the mass of the vinyl chloride resin alone and stir to obtain the black colored vinyl ester resin. It was made to disperse | distribute uniformly and the incompatible resin mixture liquid 1 was obtained. The base fabric 1 was immersed in a bath filled with the resin mixture liquid 1, and the base mixture 1 was completely impregnated with the resin mixture liquid 1. Next, the excess resin mixture liquid 1 on both sides of the base cloth 1 was scraped off with a doctor blade, and heated in an electric furnace at 180 ° C. for 5 minutes to obtain a sheet in which both sides of the base cloth 1 were coated with a flexible resin. Next, on one surface of the PET film, the resin mixture liquid 1 is coated with a thickness of 0.12 mm, and this is overlaid on one side of the previously prepared sheet and heated in an electric furnace at 180 ° C. for 5 minutes to obtain the resin mixture liquid 1 After solidifying, the PET film was removed to form a smooth flexible resin layer (construction appearance side). When this flexible resin layer was observed with a microscope, the vinyl ester resin constituted a white island component and the soft vinyl chloride resin constituted a colorless sea component. Next, the adhesive / protective layer forming coating solution of the following formulation 3 was applied to the flexible resin layer with a gravure coater, dried at 100 ° C. for 1 minute, and then cooled to form a 1.5 g / m ² adhesive / protective layer sheet. Further, a coating solution for forming a carcass carcass decomposition layer (visible light responsive photocatalyst-containing layer) having the following composition 4 was applied on the both surfaces with a gravure coater, dried at 120 ° C. for 2 minutes, and then cooled. A film material for optical ceiling having a visible light transmittance of 66%, in which a 5 g / m ² larvae carcass decomposition layer was formed on both surfaces, was obtained. This sheet was applied to the optical ceiling for various evaluations. The results are shown in Table 1.
<Formulation 1>
Emulsion polymerization polyvinyl chloride resin (degree of polymerization 1700) 100 parts by mass tricresyl phosphate (plasticizer) 50 parts by mass cresylphenyl phosphate (plasticizer) 46 parts by mass zinc stearate (stabilizer) 2 parts by mass barium stearate ( Stabilizer) 2 parts by mass

<Formulation 2>
100 parts by mass of vinyl ester resin (trade name: Neopole 8319, manufactured by Nippon Iupika Co., Ltd.)
1 part by weight of curing agent (di- (4-tert-butylcyclohexyl) peroxydicarbonate)
Coloring agent (calcium carbonate: average particle size 1 μm) 10 parts by mass

<Formulation 3> Adhesive / Protective Layer Ethanol-ethyl acetate (50/50 mass ratio) solution containing 8 mass% (solid content) of acrylic silicone resin having a silicone content of 3 mol% 100 mass parts Methyl silicate MS51 (Colcoat Co., Ltd.) )of
20% ethanol solution (polysiloxane) 8 parts by mass γ-methacryloxypropyltrimethoxysilane (silane coupling agent) 1 part by mass

<Formulation 4> Decayed carcass decomposition layer (visible light responsive photocatalyst containing layer)
Snowtex O (Colloidal Silica: manufactured by Nissan Chemical Industries, Ltd.) 67 parts by mass Methyltrimethoxysilane 33 parts by mass Tungsten oxide (WO ₃ ) fine particles 27 parts by mass Copper oxide (CuO) fine particles 3 parts by mass Diluting solvent (methyl alcohol) 50 parts by weight

[Example 2]
To the stirring mixture of the soft vinyl chloride resin paste of Formulation 1, 20% by mass of the white colored vinyl ester resin stirring mixture of Formula 5 below is added to the mass of the vinyl chloride resin alone and stirred to uniformly distribute the white colored vinyl ester resin. Dispersed to obtain an incompatible resin mixture liquid 2. The base fabric 2 was dipped in a bath filled with the resin mixture liquid 2, and the base mixture 2 was completely impregnated with the resin mixture liquid 2. Next, the excess resin mixture liquid 2 on both surfaces of the base fabric 2 was scraped off with a doctor blade and heated in an electric furnace at 180 ° C. for 5 minutes to obtain a sheet having both surfaces of the base fabric 2 coated with a flexible resin. Next, the resin mixture liquid 1 is coated on one surface of the PET film at a thickness of 0.12 mm, and this is overlaid on one side of the previously prepared sheet and heated in an electric furnace at 180 ° C. for 5 minutes to obtain the resin mixture liquid 2 After solidifying, the PET film was removed to form a smooth flexible resin layer (construction appearance side). When this flexible resin layer was observed with a microscope, the vinyl ester resin constituted a white island component and the soft vinyl chloride resin constituted a colorless sea component. Next, the adhesive / protective layer-forming coating solution of Formulation 3 was applied to the flexible resin layer with a gravure coater, dried at 100 ° C. for 1 minute, and then cooled to provide a 1.5 g / m ² adhesive / protective layer on both sides. Further, a coating solution for forming a beetle carcass decomposition layer (visible light responsive photocatalyst-containing layer) of Formulation 4 was applied thereon with a gravure coater, dried at 120 ° C. for 2 minutes, and then cooled to 1.5 g / m ^2. A film material for optical ceiling having a visible light transmittance of 65% was obtained. The obtained sheet was applied to the optical ceiling for various evaluations. The results are shown in Table 1.
<Formulation 5>
100 parts by mass of vinyl ester resin (SSP50-C06 manufactured by Showa Polymer Co., Ltd.)
1 part by weight of curing agent (di- (4-tert-butylcyclohexyl) peroxydicarbonate)
Colorant (titanium oxide particles: average particle size 0.4 μm) 5 parts by mass

[Example 3]
A film material for optical ceiling with a carcass decomposition layer was prepared in the same manner as in Example 2 except that the base cloth 3 was used. The visible light transmittance of this sheet was 67%. The obtained sheet was applied to the optical ceiling for various evaluations. The results are shown in Table 1.

[Example 4]
The white-colored vinyl ester resin stirring mixture of Formulation 2 of Example 1 was replaced with the white-colored silicone resin of Formulation 6 below, and 20% by mass was added to the mass of the vinyl chloride resin alone and stirred, so that the white-colored silicone resin was uniform. Dispersed to obtain an incompatible resin mixture liquid 3. The base fabric 4 was immersed in a bath filled with the resin mixture liquid 3, and the base mixture 4 was completely impregnated with the resin mixture liquid 3. Next, the excess resin mixture liquid 3 on both surfaces of the base fabric 4 was scraped off with a doctor blade and heated in an electric furnace at 180 ° C. for 5 minutes to obtain a sheet in which both surfaces of the base fabric 4 were coated with a flexible resin. Next, the resin mixture liquid 3 is coated on one surface of the PET film at a thickness of 0.12 mm, and this is overlaid on one side of the previously prepared sheet and heated in an electric furnace at 180 ° C. for 5 minutes to obtain the resin mixture liquid 3 After solidifying, the PET film was removed to form a smooth flexible resin layer (construction appearance side). When this flexible resin layer was observed with a microscope, the silicone resin constituted a white island component and the soft vinyl chloride resin constituted a colorless sea component. Next, in the same manner as in Example 1, the adhesive / protective layer of Formulation 3 was formed on both sides of the flexible resin layer at 1.5 g / m ² , and further, the larvae carcass decomposition layer of Formulation 4 (visible light response) A film material for optical ceiling having a visible light transmittance of 69% was obtained with a type photocatalyst containing layer) of 1.5 g / m ² formed on both sides. The obtained sheet was applied to the optical ceiling for various evaluations. The results are shown in Table 1.
<Formulation 6>
Trademark: Shirasukon RTV4086A
(2-component addition reaction curable silicone resin: active ingredient 100%: manufactured by Dow Corning Asia)
50 parts by mass Trademark: Shirasukon RTV4086B
(2-component addition reaction curable silicone resin: active ingredient 100%: manufactured by Dow Corning Asia)
50 parts by weight Colorant (titanium oxide particles: average particle size 0.4 μm) 5 parts by weight

[Example 5]
In Example 4, the white colored silicone resin of Formulation 4 was replaced with the white colored silicone resin of Formulation 7 below, and 20% by mass was added to the mass of the vinyl chloride resin alone and stirred to uniformly disperse the white colored silicone resin. A compatible resin mixture liquid 4 was obtained. Other than that was carried out similarly to Example 4, and obtained the sheet | seat with a visible light transmittance of 54% which provided the photocatalyst layer on both surfaces. The obtained industrial material sheet was applied to the optical ceiling for various evaluations. The results are shown in Table 1.
<Formulation 7>
Trademark: Shirasukon RTV4086A
(2-component addition reaction curable silicone resin: active ingredient 100%: manufactured by Dow Corning Asia)
50 parts by mass Trademark: Shirasukon RTV4086B
(2-component addition reaction curable silicone resin: active ingredient 100%: manufactured by Dow Corning Asia)
50 parts by weight Colorant (calcium carbonate: average particle size 1 μm) 10 parts by weight

[Example 6]
The white colored vinyl chloride resin stirred mixture of the following formulation 9 is added to the silicone resin stirred mixture of the following formulation 8 with respect to the mass of the silicone resin alone and stirred to uniformly disperse the white colored vinyl chloride resin. A compatible resin mixture liquid 5 was obtained. The base fabric 1 was immersed in a bath filled with the resin mixture liquid 5, and the base mixture 1 was completely impregnated with the resin mixture liquid 5. Next, the excess resin mixture liquid 5 on both surfaces of the base fabric 1 was scraped off with a doctor blade and heated in an electric furnace at 180 ° C. for 10 minutes to obtain a sheet having both surfaces of the base fabric 1 coated with a flexible resin. Next, on one surface of the PET film, the resin mixture liquid 1 is coated with a thickness of 0.12 mm, and this is overlaid on one side of the previously prepared sheet and heated in an electric furnace at 180 ° C. for 10 minutes to obtain the resin mixture liquid 5 After solidifying, the PET film was removed to form a smooth flexible resin layer (construction appearance side). When this flexible resin layer was observed with a microscope, the vinyl chloride resin constituted a white island component and the silicone resin constituted a colorless sea component. Next, in the same manner as in Example 1, the adhesive / protective layer of Formulation 3 was formed on both sides of the flexible resin layer at 1.5 g / m ² , and further, the larvae carcass decomposition layer of Formulation 4 (visible light response) A film material for optical ceiling having a visible light transmittance of 54% was obtained with a type photocatalyst containing layer) of 1.5 g / m ² formed on both sides. The obtained sheet was applied to the optical ceiling for various evaluations. The results are shown in Table 1.
<Formulation 8>
Trademark: Shirasukon RTV4086A
(2-component addition reaction curable silicone resin: active ingredient 100%: manufactured by Dow Corning Asia)
50 parts by mass Trademark: Shirasukon RTV4086B
(2-component addition reaction curable silicone resin: active ingredient 100%: manufactured by Dow Corning Asia)
50 parts by weight

<Formulation 9>
Emulsion polymerization polyvinyl chloride resin (degree of polymerization 1700) 100 parts by mass tricresyl phosphate (plasticizer) 50 parts by mass cresylphenyl phosphate (plasticizer) 46 parts by mass zinc stearate (stabilizer) 2 parts by mass barium stearate ( Stabilizer) 2 parts by mass
10 parts by weight of colorant (calcium carbonate: average particle size 1 μm) The obtained sheet was applied to the optical ceiling for various evaluations. The results are shown in Table 1.

[Example 7]
The hot-melt kneaded product of the white colored polyethylene resin of the following formulation 11 is added to the hot-melt kneaded product of the soft vinyl chloride resin of the following formulation 10 with respect to the mass of the vinyl chloride resin alone, and it is hot-melt kneaded with a Banbury mixer. Then, the white colored polyethylene resin was uniformly dispersed to obtain an incompatible resin mixture 6. This resin mixture 6 was passed through four calendar rolls set at 180 ° C. and molded into a film having a thickness of 0.12 mm. This film was laminated on both surfaces of the base fabric 1 as a flexible resin layer to obtain an industrial material sheet. When this flexible resin layer was observed with a microscope, the polyethylene resin constituted a white island component and the soft vinyl chloride resin constituted a colorless sea component. Next, in the same manner as in Example 1, both sides of the adhesive / protective layer of Formulation 3 were formed at 1.5 g / m ² on the flexible resin layer, and further, the insect body carcass decomposition layer (Visible light) of Formulation 4 was formed thereon. A film material for optical ceiling having a visible light transmittance of 63% was obtained in which both sides of the responsive photocatalyst-containing layer were formed at 1.5 g / m ² . The obtained sheet was applied to the optical ceiling for various evaluations. The results are shown in Table 1.
<Formulation 10>
Polyvinyl chloride resin (degree of polymerization 1300) 100 parts by mass Tricresyl phosphate (plasticizer) 50 parts by mass Cresylphenyl phosphate (plasticizer) 46 parts by mass Zinc stearate (stabilizer) 2 parts by mass Barium stearate (stabilizer) 2 parts by mass

<Formulation 11>
Low density polyethylene resin (density 0.945) 100 parts by weight Colorant (calcium carbonate: average particle size 1 μm) 10 parts by weight

[Example 8]
To the hot melt kneaded product of the soft fluorine resin of the following formulation 12, the hot-melt kneaded product of the white colored vinyl chloride resin of the following blend 13 is added by 20% by mass with respect to the mass of the soft fluoro resin alone, and hot melt kneaded with a Banbury mixer. The white colored vinyl chloride resin was uniformly dispersed to obtain an incompatible resin mixture 7. This resin mixture 7 was passed through four calendar rolls set at 180 ° C. to form a film having a thickness of 0.12 mm. This film was laminated on both surfaces of the base fabric 1 as a flexible resin layer to obtain a sheet. When this flexible resin layer was observed with a microscope, the vinyl chloride resin constituted a white island component, and the soft fluororesin constituted a colorless sea component. Next, in the same manner as in Example 1, the adhesive / protective layer of Formulation 3 was formed on both sides of the flexible resin layer at 1.5 g / m ² , and further, the larvae carcass decomposition layer of Formulation 4 (visible light response) A film material for optical ceiling having a visible light transmittance of 58% was obtained with a type photocatalyst containing layer) of 1.5 g / m ² formed on both sides. The obtained sheet was applied to the optical ceiling for various evaluations. The results are shown in Table 1.
<Formulation 12>
Soft fluororesin (ethylene tetrafluoride-propylene hexafluoride-vinylidene fluoride terpolymer resin)
100 parts by mass

<Formulation 13>
Polyvinyl chloride resin (degree of polymerization 1300) 100 parts by mass Tricresyl phosphate (plasticizer) 50 parts by mass Cresylphenyl phosphate (plasticizer) 46 parts by mass Zinc stearate (stabilizer) 2 parts by mass Barium stearate (stabilizer) 2 parts by mass
Colorant (titanium oxide particles: average particle size 0.4 μm) 5 parts by mass

  Each of the optical ceiling film materials of Examples 1 to 8 had high visible light transmittance and had sufficient strength as an optical ceiling film material. These optical ceiling systems using optical ceiling membrane materials can hardly see the presence of fluorescent lamps placed behind them, and the shadows of stretched filaments of the base fabric included in the optical ceiling membrane material can hardly be seen. Regardless, extremely high illuminance was obtained. Furthermore, when the flying mosquitoes, such as chili mosquitoes, have degradability and the diffusion effect of the optical ceiling membrane material, when the chisel mosquito strays into the optical ceiling system, As an inconspicuous existence. The surface of the wingworm carcass decomposition layer of these examples all satisfy the Rz value of 10 to 200 μm and the Sm value of 0.1 to 3 mm. By making it a wreckage trace, there was no shadow trace. Moreover, all the film | membrane materials for optical ceilings of Examples 1 and 4-8 conformed to the nonflammability standard.

[Comparative Example 1]
In Example 1, a sheet was obtained in the same manner as in Example 1 except that the combined use of the white colored vinyl ester resin stirring mixture of Formulation 2 was omitted. The obtained sheet was applied to the optical ceiling for various evaluations. The results are shown in Table 2.

[Comparative Example 2]
In Example 1, a sheet was obtained in the same manner as in Example 1 except that the white colorant was omitted from the white colored vinyl ester resin stirring mixture of Formulation 2. The obtained sheet was applied to the optical ceiling for various evaluations. The results are shown in Table 2.

[Comparative Example 3]
In Example 1, a sheet was obtained in the same manner as in Example 1 except that the formation of the beetle carcass decomposition layer (visible light-responsive photocatalyst-containing layer) of Formulation 4 was omitted. The obtained sheet was applied to the optical ceiling for various evaluations. The results are shown in Table 2.

The sheet of Comparative Example 1 lacked the light diffusion effect, and the presence of fluorescent lamps was conspicuous, and the remains of the dead mosquitoes were visually recognized as shadow marks. In the sheet of Comparative Example 2, the light diffusion effect was satisfactory and the presence of the fluorescent lamp on the back surface was inconspicuous, but the remains of the dead mosquitoes were visually recognized as shadow marks. In the sheet of Comparative Example 3, the dead mosquito corpse remains almost intact after 60 days, and was visually recognized as a shadow mark.

  According to the present invention, it is a flexible fiber composite film material that can be suitably used for optical ceiling applications, has high visible light permeability and moderate light diffusibility, and has particularly infiltrated into the optical ceiling system. It is possible to provide an optical ceiling film material that can relieve or prevent foreign matter shadows caused by the dead bodies of photocatalytic worms, and an optical ceiling system thereof. The optical ceiling film material according to the present invention and the optical ceiling system can be driven by the optical characteristics of the flexible fiber composite film material even if the degradation of the dead body of the light-moving worm that has entered the optical ceiling system is less than 100%. Because it has the effect of remarkably relieving the shadow marks of the dead worms, the entrance hall, lounge and party halls of the hotel, office building large conference room, ceremonial hall, station building / airport facilities, underground shopping hall, It can be widely used in optical ceiling lighting shades such as commercial facilities, various public facilities, elevator cars, and railway vehicles. Furthermore, in the present invention, it is also possible to provide a film material for optical ceiling having nonflammability and an optical ceiling system for fire countermeasures.

1: Woven fabric 2: Flexible resin layer (sea-island structure)
3: Decay carcass decomposition layer (visible light responsive photocatalyst containing layer)
4: Membrane material for optical ceiling (light diffusive transparent sheet)
5: Light source (fluorescent lamp)
6: Lifting tool 7: Frame 8: File mosquito 9: Sea component 9-1: Sea component including colorant 9-2: Sea component not including colorant 10: Island component 10-1: Island component including colorant 10-2: Island component not containing colorant

Claims (10)

A light diffusing and transmitting sheet comprising a composite base material provided with a flexible resin layer on at least one side of a woven fabric comprising drawn filaments, wherein at least one layer of the light diffusing and transmitting sheet has visible light. A larvae carcass decomposition layer containing a responsive photocatalytic substance is provided, and the flexible resin layer has a sea-island structure composed of an incompatible mixture of a synthetic resin blend of a non -colored synthetic resin and a colored synthetic resin. Furthermore, in the sea-island structure, a film material for optical ceiling having excellent anti-feathering shadow marks, wherein only the island component contains white fine particles made of an inorganic compound as a colorant .   The photocatalytic substance is at least one selected from a cocatalyst-added (supported) photocatalyst, an anion doped photocatalyst, a cation doped photocatalyst, a co-doped photocatalyst, a metal halide supported photocatalyst, and an oxygen deficient photocatalyst. The film | membrane material for optical ceilings of Claim 1. In the light diffusing and permeable sheet, the surface of the beetle carcass decomposition layer forming surface has irregularities having a surface roughness Rz value (JIS-B0601) of 10 to 200 μm, and an average interval Sm value of irregularities (JIS-B0601). The film | membrane material for optical ceilings of Claim 1 or 2 which is 1-3 mm. The drawn filament has a drawing direction a and a drawing vertical direction b with respect to the drawing direction a, and the difference between the refractive index n1 of the flexible resin layer and the refractive index na in the drawing direction of the drawn filament. The absolute value | n1-na | satisfies the following formula 1, and the absolute value | n1-nb | of the difference between the refractive index n1 of the flexible resin layer and the refractive index nb in the extending vertical direction b is The optical ceiling film material according to any one of claims 1 to 3 , wherein the film material has an optical characteristic that satisfies Equation (2).
0 <| n1-na | ≦ 0.2 Formula 1
| N1-nb | ≦ 0.2 Formula 2 In the light diffusive and permeable sheet, after the start of heating when radiant heat from a radiant electric heater is applied to the light diffusable and permeable sheet in a cone calorimeter test method (ASTM-E1354) at 50 kW / m ^2. The total calorific value for 20 minutes is 8 MJ / m ² or less, and has a non-combustible characteristic that the maximum heat generation rate does not exceed 200 kW / m ² for 20 minutes after heating starts for 10 seconds or more. Item 5. The optical ceiling film material according to any one of Items 1 to 4 . Using a light diffusion / transmission sheet including a composite base material provided with a flexible resin layer on one or more sides of a woven fabric including a stretched filament as an optical ceiling film material, on the back surface of the light diffusion / transmission sheet, An optical ceiling structure in which a fluorescent lamp is arranged, and at least the light diffuse transmission sheet surface side facing the fluorescent lamp is provided with a larvae carcass decomposition layer containing a visible light responsive photocatalytic substance, In addition, the flexible resin layer has a sea-island structure made of an incompatible mixture of a synthetic resin blend of a non -colored synthetic resin and a colored synthetic resin, and in the sea-island structure, only the island component is inorganic as a colorant. An optical ceiling system with excellent anti-feathering shadow marks, characterized by containing white fine particles of a compound . The photocatalytic substance is at least one selected from a cocatalyst-added (supported) photocatalyst, an anion doped photocatalyst, a cation doped photocatalyst, a co-doped photocatalyst, a metal halide supported photocatalyst, and an oxygen deficient photocatalyst. The optical ceiling system according to claim 6 . In the light diffusing and permeable sheet, the surface of the beetle carcass decomposition layer forming surface has irregularities having a surface roughness Rz value (JIS-B0601) of 10 to 200 μm, and an average interval Sm value of irregularities (JIS-B0601). The optical ceiling system of Claim 6 or 7 which is 1-3 mm. The drawn filament has a drawing direction a and a drawing vertical direction b with respect to the drawing direction a, and the difference between the refractive index n1 of the flexible resin layer and the refractive index na in the drawing direction of the drawn filament. The absolute value | n1-na | satisfies the following formula 1, and the absolute value | n1-nb | of the difference between the refractive index n1 of the flexible resin layer and the refractive index nb in the extending vertical direction b is The optical ceiling system according to any one of claims 6 to 8 , wherein the optical ceiling system has an optical characteristic that satisfies Equation (2).
0 <| n1-na | ≦ 0.2 Formula 1
| N1-nb | ≦ 0.2 Formula 2 In the light diffusive and permeable sheet, after the start of heating when radiant heat from a radiant electric heater is applied to the light diffusable and permeable sheet in a cone calorimeter test method (ASTM-E1354) at 50 kW / m ^2. The total calorific value for 20 minutes is 8 MJ / m ² or less, and has a non-combustible characteristic that the maximum heat generation rate does not exceed 200 kW / m ² for 20 minutes after heating starts for 10 seconds or more. Item 10. The optical ceiling system according to any one of Items 6 to 9 .