JP2022105420A - Sheet and air conditioning system - Google Patents

Abstract

To provide a sheet that divides a cold aisle from a hot aisle in an air conditioning system including racks that contain heating devices; an air conditioner; the cold aisle that sends the cold air flowed from the air conditioner to the racks; and the hot aisle that flows warm air obtained by warming cold air that passes through the racks, wherein the sheet hardly shows a deterioration of visibility due to winkles when the sheet is attached to a support frame or the like and the sheet also resists being burned.SOLUTION: The present invention discloses a sheet that divides a cold aisle from a hot aisle, the sheet having a curable resin layer with which glass fiber cloth is impregnated. The sheet has a total light transmittance of 80% or more and a haze of 20% or less. In a heat build-up test, the maximum heating rate does not exceed 200 kW/m2 continuously for 10 seconds or longer after the start of heating. The gross heating value is 8 MJ/m2 or less. The flexural rigidity is 10 gf cm2/cm or more as measured with a pure bending tester KES-FB2-S.SELECTED DRAWING: Figure 1

Description

The present invention relates to, for example, a sheet for partitioning a cold aisle and a hot aisle in a data center or the like, and an air conditioning system including the sheet.

In data centers and the like, racks that house heat-generating equipment such as servers need to be cooled efficiently. For this reason, in the prior art, a device is devised to divide the space into a cold aisle and a hot aisle.

As an air-conditioning mechanism for a rack for heat-generating equipment, for example, a plurality of rack rows configured by connecting a plurality of racks accommodating heat-generating equipment are arranged with their longitudinal directions facing each other at intervals and facing each other. The structure is such that the cold air from the air conditioner is supplied upward from the floor surface between the pair of rack rows, and the plate body is projected from the upper end side of each of the rack rows toward the upper end of the other rack row facing each other. At the same time, a space is provided between the edges of the plates protruding from each rack row to form a cold aisle space having a gap on the ceiling side, and the gap is formed by the cold air supplied from the floor surface. There is known an air conditioning mechanism for a rack for heat generating equipment in which the cold aisle space is set at an interval that does not cause a pressure difference from the ceiling side outer space (see, for example, Patent Document 1). Patent Document 1 has a configuration in which a partition door member is supported at the end in the depth direction of the cold aisle space to prevent the inflow of warm air through the end in the depth direction. To improve, support frames are supported and spaced apart from each other on the outside of the eaves-shaped plates of a pair of racks corresponding to the depth end of the cold aisle space, and these support frames allow the cold aisle to face each other. It is described that the partition door member is supported by a flexible sheet body such as a vinyl curtain at the end in the depth direction of the space.

Further, as an air conditioning system for an information and communication machine room, an air conditioning system for cooling an information and communication machine room in which a plurality of cold aisles and a plurality of hot aisles are formed by a plurality of server rack rows by a plurality of air conditioners. A cold zone (8), which is a collective space of a plurality of cold aisle portions (8a) and a shared portion (8b) communicating with the cold aisle portion (8a), and a plurality of hot aisle portions (9a) and a shared portion communicating with the cold zone (8a). There is known an air-conditioning system in an information and communication machine room, which is partitioned into a hot zone (9), which is a collective space of a section (9b), and is configured to substantially block air flow between the two zones. (See, for example, Patent Document 2). Patent Document 2 is provided with a partition wall that substantially blocks air flow between the cold zone (8) and the hot zone (9), and the boundary surface partition wall does not necessarily have to be made of a plate material. , For example, it is described that a transparent sheet made of a resin material or the like can be used.

Japanese Patent Application Laid-Open No. 2015-153006 Japanese Unexamined Patent Publication No. 2014-156981

As disclosed in Patent Documents 1 and 2, a plurality of racks accommodating heat generating devices, an air conditioner, a cold aisle that sends cold air flowing from the air conditioner to the rack, and the cold air occupying the rack. It is known that a transparent sheet such as a vinyl curtain is used as a member for separating a cold aisle and a hot aisle in an air conditioning system including a hot aisle that flows warm air that is warmed by passing through. However, for example, when a transparent sheet made of soft vinyl chloride (PVC) attached to a support frame is used as a member for separating the cold aisle and the hot aisle, wrinkles may occur on the sheet during attachment. was there. Then, the present inventor has learned that when wrinkles occur on the sheet, the visibility through the sheet deteriorates and it becomes difficult to monitor the monitor or the like.

Further, since the air conditioning system as in Patent Documents 1 and 2 is provided in the room of a building, it is desired that the sheet used in the system has a non-combustible property.

Therefore, the present invention solves the above problems, includes a plurality of racks accommodating heat generating devices, an air conditioner, a cold aisle that sends cold air flowing from the air conditioner to the rack, and the cold air passing through the rack. In an air conditioning system including a hot aisle that allows warm air to flow, the sheet that separates the cold aisle and the hot aisle is also used when the sheet is attached to, for example, a support frame or the like. The main issue is to provide a sheet that suppresses deterioration of visibility due to wrinkles and has a property of being hard to burn.

When the present inventor investigated the cause of the above problems, it was found that wrinkles may occur when the sheet is attached to a support frame or the like due to the rigidity of the sheet that separates the cold aisle and the hot aisle. Got it. Specifically, for example, when a soft vinyl chloride sheet having a thickness of about 300 μm is used as the sheet, it has been found that the sheet is inferior in rigidity and wrinkles are likely to occur.

On the other hand, in order to improve the rigidity of the sheet, it is conceivable to increase the thickness of the sheet. However, if the thickness of the sheet is simply increased, the organic mass per unit area of the sheet increases, the calorific value at the time of combustion increases, and the sheet becomes flammable.

Therefore, as a result of further diligent studies by the present inventor, a curable resin layer contained in a glass fiber woven fabric in a state of being impregnated is provided, the total light transmittance is 80% or more, the haze is 20% or less, and a general incorporated foundation. The surface of the sheet from the radiant electric heater, which is measured according to the 4.10.2 heat generation test / evaluation method in the "Fireproof Performance Test / Evaluation Business Method Manual" (changed version on March 1, 2014) of the Building Materials Testing Center. In the heat generation test in which radiant heat of 50 kW / m ² is irradiated, the maximum heat generation rate after the start of heating does not exceed 200 kW / m ² continuously for 10 seconds or more, the total calorific value is 8 MJ / m ² or less, and , A sheet having a bending rigidity of 10 gf · cm ² / cm or more measured by a pure bending tester KES-FB2-S manufactured by Kato Tech Co., Ltd. is caused by wrinkles even when used by attaching it to a support frame, for example. It has the property of suppressing the deterioration of visibility and being hard to burn, and the sheet has a plurality of racks for accommodating heat generating devices, an air conditioner, and cold air flowing from the air conditioner to the rack. It has been found that it can be suitably used as a member for partitioning a cold aisle and a hot aisle in an air conditioning system including a cold aisle to be sent and a hot aisle for flowing warm air formed by the cold air passing through the rack. .. Further, in order to obtain the flexural rigidity, it is necessary to provide a curable resin layer contained in the glass fiber woven fabric in a state of being impregnated, and the thickness of the curable resin layer is adjusted as necessary. I found that it was possible.

That is, the present invention provides the inventions of the following aspects.
Item 1. A plurality of racks accommodating heat generating devices, an air conditioner, a cold aisle that sends cold air flowing from the air conditioner to the rack, and a hot aisle that flows warm air that is warmed by the cold air passing through the rack. A sheet used for partitioning the cold aisle and the hot aisle in a room provided with the above, wherein the sheet includes a curable resin layer contained in a state of being impregnated with a glass fiber woven fabric. The light transmittance is 80% or more, the haze is 20% or less, and 4.10. 2 In the heat generation test in which the surface of the sheet is irradiated with radiant heat of 50 kW / m ² from the radiant electric heater, which is measured according to the heat generation test / evaluation method, the maximum heat generation rate after the start of heating is 200 kW / for 10 seconds or longer. It does not exceed m ² , the total calorific value is 8 MJ / m ² or less, and the bending rigidity measured by the pure bending tester KES-FB2-S manufactured by Kato Tech Co., Ltd. is 10 gf · cm ² / cm or more. , Sheet.
Item 2. A plurality of racks accommodating heat generating devices, an air conditioner, a cold aisle that sends cold air flowing from the air conditioner to the rack, and a hot aisle that flows warm air that is warmed by the cold air passing through the rack. An air conditioning system including a sheet for partitioning the cold aisle and the hot aisle, wherein the sheet includes a curable resin layer contained in a state of being impregnated in a glass fiber woven fabric, and has a total light transmission rate. Is 80% or more and haze is 20% or less, and 4.10.2 heat generation in the "Fireproof Performance Test / Evaluation Business Method Manual" (revised on March 1, 2014) of the Building Materials Testing Center. In the heat generation test in which the surface of the sheet is irradiated with radiant heat of 50 kW / m ² from the radiant electric heater, which is measured according to the test / evaluation method, the maximum heat generation rate after the start of heating is continuously 200 kW / m ² for 10 seconds or more. An air conditioning system that does not exceed, has a total calorific value of 8 MJ / m ² or less, and has a bending rigidity of 10 gf · cm ² / cm or more measured by a pure bending tester KES-FB2-S manufactured by Kato Tech Co., Ltd. ..
Item 3. A plurality of racks accommodating heat generating devices, an air conditioner, a cold aisle that sends cold air flowing from the air conditioner to the rack, and a hot aisle that flows warm air that is warmed by the cold air passing through the rack. A method for suppressing wrinkles of the sheet in an air conditioning system including a sheet for partitioning the cold aisle and the hot aisle, which is a curable resin contained as the sheet in a state of being impregnated with a glass fiber woven fabric. Equipped with layers, total light transmission rate is 80% or more, haze is 20% or less, "Fireproof performance test / evaluation work method manual" of the Building Materials Testing Center (changed version on March 1, 2014) In the heat generation test in which the surface of the sheet is irradiated with radiant heat of 50 kW / m ² from the radiant electric heater, which is measured according to the heat generation test / evaluation method in 4.10.2, the maximum heat generation rate after the start of heating is 10 seconds or more. It does not continuously exceed 200 kW / m ² , the total calorific value is 8 MJ / m ² or less, and the bending rigidity measured by the pure bending tester KES-FB2-S manufactured by Kato Tech Co., Ltd. is 10 gf · cm ² . A wrinkle suppression method using a sheet having a size of / cm or more.

The sheet of the present invention has a property of suppressing deterioration of visibility due to wrinkles and being hard to burn even when used by attaching to a support frame or the like, for example. Since the sheet exerts the above effects, a plurality of racks accommodating heat generating devices, an air conditioner, a cold aisle that sends cold air flowing from the air conditioner to the rack, and the cold air presses the rack. It can be suitably used as a member for partitioning a cold aisle and a hot aisle in an air conditioning system including a hot aisle that flows warm air that is warmed by passing through.

It is a schematic sectional drawing which shows an example of the sheet of this invention. It is a schematic sectional drawing which shows an example of the sheet of this invention. It is a schematic sectional drawing which shows an example of the sheet of this invention. It is a schematic sectional drawing which shows an example of the sheet of this invention. It is a schematic plan view explaining the method of measuring the tear strength of this invention. It is a plane schematic diagram explaining an example of the air-conditioning system of this invention. It is a plane schematic diagram explaining an example of the air conditioning system of this invention.

The sheet of the present invention is heated by a plurality of racks accommodating heat generating devices, an air conditioner, a cold aisle that sends cold air flowing from the air conditioner to the rack, and the cold air passing through the rack. A sheet used for partitioning the cold aisle and the hot aisle in a room provided with a hot aisle for flowing warm air, wherein the sheet is contained in a state of being impregnated with a glass fiber woven fabric. Equipped with a resin layer, the total light transmittance is 80% or more, the haze is 20% or less, and the "Fireproof Performance Test / Evaluation Business Method Manual" of the Building Materials Testing Center (revised March 1, 2014) In the heat generation test in which the surface of the sheet is irradiated with radiant heat of 50 kW / m ² from the radiant electric heater, which is measured according to the 4.10.2 heat generation test / evaluation method, the maximum heat generation rate after the start of heating is 10 seconds. The bending rigidity measured by the pure bending tester KES-FB2-S manufactured by Kato Tech Co., Ltd. is 10 gf · cm, the total calorific value is 8 MJ / m ² or less, and the total calorific value does not continuously exceed 200 kW / m ² . It is ² / cm or more. Hereinafter, the sheet of the present invention will be described in detail.

1. 1. About the sheet First, the structure of the sheet 1 of the present invention will be described in detail.

For example, as shown in FIGS. 1 to 4, the sheet 1 of the present invention has a laminated structure including a glass fiber woven fabric 2 and a curable resin layer 3 impregnated in the glass fiber woven fabric 2. In the sheet 1, the glass fiber woven fabric 2 may contain at least one layer, and may contain a plurality of layers.

Further, as shown in FIGS. 2 to 4, the sheet 1 of the present invention has a glass fiber woven fabric 2, a curable resin layer 3 impregnated in the glass fiber woven fabric 2, and at least one surface of the curable resin layer 3. It is also possible to preferably have a laminated structure including the film layer 4 on both sides. Further, as shown in FIGS. 3 and 4, the sheet 1 of the present invention is for partitioning the cold aisle and the hot aisle on at least one side, preferably both sides of the curable resin layer 3 or the film layer 4. A peelable protective film 5 that is peeled off when used can be included.

In FIGS. 1 to 4, the curable resin layer 3 fills the gaps between the plurality of glass fibers constituting the glass fiber woven fabric 2, and one surface side portion 31 of the curable resin layer 3 and the other surface. The side portion and 32 communicate with each other through the gap portion. Further, in the sheet 1 of the present invention, from the viewpoint of enhancing transparency, for example, as shown in FIGS. 1 to 4, the curable resin layer 3 is formed on at least one surface of the layer of the glass fiber woven fabric 2. It is more preferable that the curable resin layer 3 is formed on both sides of the layer of the glass fiber woven fabric 2.

When the film layer 4 shown in FIG. 1 is not laminated, the surface side of the curable resin layer 3 (31, 32 side in FIG. 1), or when the film layer 4 shown in FIGS. As shown in FIG. 4, for example, an antistatic layer 6 containing a metal or a metal compound can be provided on the surface side (41, 42 side in FIGS. 2 and 3) of the film layer 4. It is more preferable that the antistatic layer 6 containing a metal or a metal compound is arranged so as to be a surface layer when the sheet 1 is used. Hereinafter, the composition of each layer constituting the sheet 1 of the present invention will be described in detail.

(Glass fiber woven fabric 2)
In the sheet 1 of the present invention, the glass fiber woven fabric 2 is composed of a plurality of glass fibers. The weaving structure of the glass fiber woven fabric is not particularly limited, and examples thereof include plain weave, satin weave, twill weave, diagonal weave, and ridge weave.

The glass material of the glass fiber constituting the glass fiber woven fabric 2 is not particularly limited, and for example, a known glass material can be used. Examples of the glass material include non-alkali glass (E glass), acid-resistant alkali-containing glass (C glass), high-strength and high-elasticity glass (S glass, T glass, etc.), alkali-resistant glass (AR glass), and the like. However, preferably, non-alkali glass (E glass) having high versatility is mentioned. The glass fiber constituting the glass fiber woven fabric 2 may be made of one kind of glass material, or may be a combination of two or more kinds of glass fibers made of different glass materials. Further, from the viewpoint of improving the transparency, it is preferable to select a glass material having a refractive index close to that of the curable resin layer 3, which will be described later.

The count of the glass fibers constituting the glass fiber woven fabric 2 is not limited to a specific one as long as the glass fiber woven fabric 2 can be formed. The count of the glass fiber is preferably 20 tex or less, preferably 3 to 6 tex, and more preferably 3 to 5 tex, from the viewpoint of improving transparency. The count of the glass fiber may be one type alone or a combination of two or more types. The tex count of the glass fiber corresponds to the number of grams per 1000 m.

As the glass fiber constituting the glass fiber woven fabric 2, a glass yarn in which a plurality of single fibers, which are long glass fibers, are twisted together is preferable. The number of single fibers in the glass yarn is preferably about 30 to 400, more preferably about 40 to 120. The diameter of the single fiber in the glass yarn is preferably about 3.0 to 6.0 μm, more preferably about 3.0 to 5.0 μm from the viewpoint of improving the transparency of the sheet 1. The count of the glass yarn is preferably 3 to 30 tex, more preferably 3 to 12 tex, and even more preferably 3 to 5 tex from the viewpoint of improving transparency. The details of the mechanism for improving the transparency of the sheet 1 by keeping the diameter of the single fiber and the count of the glass yarn in the glass yarn constituting the glass fiber woven fabric 2 within the above ranges are not clear, but such It is considered that by satisfying the conditions, the shrinkage at the interface between the glass yarn and the curable resin layer 3 is suppressed more effectively, and as a result, the transparency of the sheet 1 is improved.

In the sheet 1, the ratio (mass%) of the glass fiber woven fabric 2 is preferably 20 to 50% by mass in the total amount of the glass fiber woven fabric 2 and the curable resin layer 3 described later from the viewpoint of improving the transparency. 20 to 40% by mass is more preferable, and 20 to 30% by mass is more preferable. The mass (g / m ² ) of one piece of the glass fiber woven fabric 2 is preferably 10 to 120 (g / m ² ), more preferably 10 to 60 (g / m ² ), and 10 to 40 (g / m 2). m ² ) is more preferable.

The thickness of the glass fiber woven fabric 2 is, for example, about 10 to 100 μm, preferably about 10 to 55 μm, and more preferably about 10 to 35 μm from the viewpoint of improving transparency. When the thickness of the glass fiber woven fabric 2 is 10 to 35 μm, it is particularly preferable that the glass fiber woven fabric 2 has a glass volume ratio of 38% or more calculated by the following formula (II). The glass fiber woven fabric 2 having a thickness of 10 to 35 μm and a glass volume fraction of 38% or more can be obtained, for example, by subjecting the glass fibers to a fiber opening treatment.

Glass volume (%) = (A / (B × C)) × 100 (II)
A: Mass of glass fiber woven fabric (g / m ² )
B: Specific gravity of the glass material constituting the glass fiber woven fabric (g / m ³ )
C: Thickness of glass fiber woven fabric (m)

The difference in refractive index between the glass fiber woven fabric 2 and the curable resin layer 3 described later is preferably 0.05 or less, more preferably 0.02 or less, still more preferably 0.01 or less. The refractive index of the glass fiber woven fabric 2 is preferably about 1.45 to 1.65, and more preferably about 1.50 to 1.60.

The refractive index of the glass fiber woven fabric 2 is measured according to the B method of JIS K 7142: 2008. Specifically, regarding the glass fibers constituting the glass fiber woven fabric 2, methylene iodide (n _D ²³ 1.747), butyl phthalate (n _D ²³ 1.491) and dimethyl carbonate (n _D ²³ 1) are used as immersion liquids. .366) was used, NAR-2T manufactured by Atago Co., Ltd. was used as an Abbe refractometer, and a sodium D line with a wavelength of 589 nm was used as a light source for measurement at a temperature of 23 ° C., and the average value of 5 tests was refracted. The value of the rate. Further, the refractive index of the curable resin layer 3 is measured according to the B method of JIS K 7142: 2008. Specifically, the curable resin layer 3 is powdered, and methylene iodide (n _D ²³ 1.747), butyl phthalate (n _D ²³ 1.491) and dimethyl carbonate (n _D ²³ 1.) are used as immersion liquids. Using 366), a small measuring microscope STM5-311 (manufactured by Olympus, observation magnification 400 times) was used as a microscope, and a sodium D line having a wavelength of 589 nm was used as a light source for measurement at a temperature of 23 ° C., and the number of tests was 5 times. Let the average value be the value of the refractive index.

The difference in Abbe number between the glass fiber woven fabric 2 and the curable resin layer 3 is preferably 30 or less, more preferably 20 or less, still more preferably 10 or less. The Abbe number of the glass fiber woven fabric 2 is preferably 30 to 80, more preferably 40 to 70, and even more preferably 50 to 65. The Abbe number of the curable resin layer and the glass fiber woven fabric is measured as follows.

(Abbe number of curable resin layer)
A sheet containing only a curable resin layer containing no glass fiber woven fabric was prepared with the same thickness under the same conditions as when containing the glass fiber woven fabric, and the test piece was made to have a width of 8 mm and a length of 20 mm, and the surface was well polished. According to the JIS K 7142A method, NAR-2T manufactured by Atago Co., Ltd. is used as the Abbe refractometer, diiodomethane is used as the contact liquid, and sodium D-ray with a wavelength of 589 nm is used as the light source. Measure. Subsequently, the dispersion value is measured and calculated using the light source as natural light, and the Abbe number is calculated according to the following formula (I).
Abbe number = (refractive index at wavelength 589 nm-1) / dispersion value (I)

(Abbe number of glass fiber woven fabric)
Using the glass material that constitutes the glass fiber, a glass sheet with a width of 8 mm, a length of 20 mm, and a thickness of 5 mm was prepared, the surface was well polished, and according to the JIS K 7142A method, it was manufactured by Atago Co., Ltd. as an Abbe refractometer. NAR-2T, diiodomethane as a contact liquid, and sodium D-ray having a wavelength of 589 nm as a light source, the measurement temperature is 23 ° C., and the refractive index at a wavelength of 589 nm is measured. Subsequently, the dispersion value is measured and calculated using the light source as natural light, and the Abbe number is calculated according to the above formula (I).

(Curable resin layer 3)
In the sheet 1 of the present invention, the curable resin layer 3 is impregnated with the glass fiber woven fabric 2 and is formed by curing or solidifying the curable resin. The curable resin layer is a cured product (photo-cured resin composition or heat-cured resin) in which the resin composition is cured by applying energy such as light or heat to the resin composition containing the curable resin. Composition).

As the curable resin, those capable of approximating the refractive index of the curable resin layer 3 and the above-mentioned glass fiber woven fabric 2 are preferable from the viewpoint of improving the transparency of the sheet 1. As the preferable curable resin, a curable resin composition having a photocurable property is preferable, and for example, vinyl ester resin, urethane acrylate resin, fluorene acrylate resin, unsaturated polyester resin, curable acrylic resin, epoxy resin and the like are used. Can be mentioned. Among them, when the film layer 4 is provided, a curable acrylic resin is more preferable from the viewpoint of further improving the adhesiveness with the film layer 4, and a cured resin composition containing an acrylic syrup is particularly preferable. In the present invention, acrylic syrup refers to a polymerizable liquid mixture in which a (meth) acrylic acid ester polymer such as polymethyl methacrylate (PMMA) is dissolved in an acrylic monomer such as methyl methacrylate. Among the above acrylic syrups, one or more acrylic acid ester polymers selected from the group consisting of polymethyl methacrylate, methyl methacrylate / methyl acrylate copolymer, and methyl methacrylate / normal butyl acrylate copolymer are methacrylic. Acrylic syrup dissolved in a methyl acrylate monomer is particularly preferable.

The resin composition forming the curable resin layer 3 may further contain additives such as a curing accelerator, a flame retardant, an ultraviolet absorber, a filler, and a photopolymerization initiator. Examples of the flame retardant include aluminum hydroxide, magnesium hydroxide, trichloroethyl phosphate, triallyl phosphate, ammonium polyphosphate, and a phosphate ester. Examples of the ultraviolet absorber include benzotriazole and the like. Examples of the filler include calcium carbonate, silica, talc and the like. Examples of the photopolymerization initiator include 2,2-dimethoxy-1,2-diphenylethane-1-one, 1-hydroxy-cyclohexyl-phenyl-ketone, and 2-hydroxy-2-methyl-1-phenyl-propane-1-. On, 1- [4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-1-propane-1-one, 2-hirodoxy-1- {4- [4- (2-hydroxy-) 2-Methyl-propionyl) -benzyl] phenyl} -2-methyl-propane-1-one, 2-methyl-1- (4-methylthiophenyl) -2-morpholinopropane-1-one, 2-benzyl-2 -Dimethylamino-1- (4-morpholinophenyl) -butanone-1,2- (dimethylamino) -2-[(4-methylphenyl) methyl] -1- [4- (4-morpholinyl) phenyl]- Examples thereof include 1-butanone, 2,4,6, -trimethylbenzoyl-diphenyl-phosphine oxide, bis (2,4,6-trimethylbenzoyl) -phenylphosphin oxide and the like. Above all, when a curable acrylic resin is used as the curable resin constituting the curable resin layer 3, 1-hydroxy-cyclohexyl-phenyl-ketone is preferable from the viewpoint of improving transparency. These additives may be used alone or in combination of two or more.

In the sheet 1 of the present invention, the mass of the curable resin layer 3 is, for example, 20 to 400 g / m ² , and from the viewpoint of further achieving both transparency and nonflammability, 20 to 250 g / m ² is used. It is preferably 20 to 100 g / m ² , and more preferably 60 to 100 g from the viewpoint of making it easy to make transparency and nonflammability parallel while keeping the flexural rigidity of the sheet 1 described later within a specific range. / M ² is particularly preferred. The thickness of the curable resin layer 3 is, for example, 20 to 500 μm, preferably 20 to 300 μm, and more preferably 30 to 150 μm from the viewpoint of achieving both transparency and nonflammability. Further, 80 to 150 μm is particularly preferable from the viewpoint of making it easy to make transparency and nonflammability parallel while keeping the bending rigidity of the sheet 1 described later in a specific range.

In the sheet 1 of the present invention, when the film layer 4 is provided, the total mass of the peelable protective film 5 of the glass fiber woven fabric 2 that is peeled off at the time of use (that is, the peeling that is peeled off at the time of use) is released. The ratio in the possible mass excluding the protective film 5 (= mass (g) of the glass fiber woven fabric 2 / mass excluding the peelable protective film 5 that is peeled off during use (g) × 100 (%)) is as follows. For example, 3 to 20% by mass is mentioned, 3 to 15% by mass is preferably mentioned, and 7 to 13% by mass is more preferably mentioned.

(Film layer 4)
In the sheet 1 of the present invention, the film layer 4 is laminated on the curable resin layer 3 impregnated in the glass fiber woven fabric 2 as needed, and the tear strength is further improved while further improving the transparency of the sheet 1. It plays a role in improving.

The film layer 4 is not particularly limited, but preferably contains a thermoplastic resin other than the polyvinyl chloride resin. Examples of the thermoplastic resin other than the polyvinyl chloride resin include those that can be formed into a film even if the amount of the plasticizer is small, and biaxially stretched containing an amorphous thermoplastic resin other than the polyvinyl chloride resin. Films are preferred. Examples of the thermoplastic resin other than the polyvinyl chloride resin include polyester resin, polycarbonate resin, and polyamide resin, and at least one of these may be contained. Further, the film layer 4 may not contain the polyvinyl chloride resin. From the viewpoint of further improving the tear strength of the sheet 1, the film layer 4 has an Elemendorff tear propagation resistance of 1 N / mm or more in both the vertical direction and the horizontal direction, and is 3 to 20 N / mm. The one with 5 to 15 N / mm is preferable, and the one with 5 to 15 N / mm is more preferable. Above all, from the viewpoint of further achieving both chemical resistance, improvement of tear strength and transparency, the film layer 4 preferably contains a polyester resin. Examples of the polyester resin include polyethylene terephthalate (PET) and polyethylene naphthalate (PEN). For the Elemendorff tear propagation resistance, the tear strength (N) was measured based on JIS K7128-2.1998 using an Elemendorff tear machine manufactured by Toyo Seiki Seisakusho Co., Ltd., and this measured value was divided by the film thickness. It means the tear propagation resistance (N / mm). The tear strength shall be the average value of the test results of 20 samples in each of the vertical direction and the horizontal direction.

The content of the plasticizer in the film layer 4 is, for example, 10% by mass or less, preferably 5% by mass or less, more preferably 3% by mass or less, still more preferably 1% by mass or less, and 0.5% by mass. The following are particularly preferred. Examples of the plasticizer include those known as plasticizers for vinyl chloride resins, for example, di-n-butyl phthalate, di-n-octyl phthalate, di-2-ethylhexyl phthalate, diisooctyl phthalate, and the like. Phthrate-based plasticizers such as diothyldecyl phthalate, diisodecyl phthalate, butylbenzyl phthalate, di-2-ethylhexyl isophthalate, -2-ethylhexyl adipate, di-2-decyl adipate, dibutyl sebatate, sebatic acid- Fatty acid ester plasticizers such as 2-ethylhexyl, tributyl phosphate, tri-2-ethylhexyl phosphate, -2-ethylhexyldiphenyl phosphate, tricresyl phosphate and other phosphate ester plasticizers, tri-2-ethylhexyl trimellitic acid , Trimellitic acid ester-based plasticizers such as trioctyl trimellitic acid, adipic acid-based polyester plasticizers, polyester-based plasticizers such as phthalic acid-based polyester plasticizers, and terephthalic acid-based plasticizers.

The film layer 4 has calcium carbonate, magnesium carbonate, calcium oxide, and oxidation on the surface on the curable resin layer 3 side (the surface in contact with the surface side portions 31 and 32 of the curable resin layer 3 in FIGS. 2 to 4). Zinc, magnesium oxide, silicon oxide, sodium silicate, aluminum hydroxide, iron oxide, zirconium oxide, barium sulfate, titanium oxide, tin oxide, antimony trioxide, carbon black, molybdenum disulfide, acrylic crosslinked polymer, styrene type It can contain particles made of inorganic particles or organic particles such as a crosslinked polymer, a silicone resin, a fluororesin, a benzoguanamine resin, a phenol resin, and a nylon resin. This improves the adhesion between the curable resin layer 3 and the film layer 4. The film layer 4 can be subjected to surface treatment such as corona treatment, frame treatment, plasma treatment, etc., if necessary, and is a coating layer that imparts various functions such as slipperiness and adhesiveness, and wear resistance. A hard coat layer or the like for improving the properties may be provided.

In the sheet of the present invention, the film used as the film layer 4 is preferably excellent in transparency and smoothness. As the transparency of the film to be used as the film layer 4, for example, the total light transmittance (JIS K 7105: 1981) is preferably 90% or more, and more preferably 91 to 98%. Further, for example, haze (JIS K 7105: 1981) is preferably 1.5% or less, more preferably 0.3 to 1.0%.

(Physical characteristics and performance of sheet 1)
The sheet 1 of the present invention needs to have a bending rigidity of 10 gf · cm ² / cm or more. As a result of the examination by the present inventor, for example, a sheet in which a commercially available glass fiber woven fabric is sandwiched between transparent polyvinyl chloride resin films has a bending rigidity of about 1 to 5 gf · cm ² / cm, and is used, for example, as a support frame or the like. It was found that wrinkles are likely to occur when the sheet is attached, and the visibility through the sheet cannot be sufficiently guaranteed. Therefore, as a result of diligent studies by the present inventor, it has been found that by setting the bending rigidity to 10 gf · cm ² / cm or more, wrinkles are less likely to occur when the sheet is attached to a support frame or the like, and visibility through the sheet can be ensured. I found it. The flexural rigidity is more preferably 15 gf · cm ² / cm or more. The upper limit is not particularly limited, but from the viewpoint of further improving transparency and nonflammability, for example, 50 gf · cm ² / cm or less, 40 gf · cm ² / cm or less is preferably mentioned, and 35 gf · cm ² / cm. More preferably, it is cm or less.

For the flexural rigidity, a pure bending tester KES-FB2-S manufactured by Kato Tech Co., Ltd. was used as a measuring device, and a 1 cm width of a predetermined area of the sheet was fixed between chucks at 1 cm intervals as a sample, ^and a curvature of +1 cm-. It is measured by bending it to the front side up to ¹ and then bending it back to a curvature of ^-1 cm -1 and then returning it to the original position. In order to obtain the bending rigidity, in addition to providing a curable resin layer impregnated in the glass fiber woven fabric, for example, the thickness of the curable resin layer 3 may be 80 μm or more. It is possible by adjusting the count, weaving density, thickness, etc. of the glass yarn constituting the glass fiber woven fabric 2.

In the sheet 1 of the present invention, from the viewpoint of ensuring transparency, the total light transmittance of the sheet 1 after peeling the peelable protective film 5 during use is 80% or more, and 85% or more. It is preferably 90% or more, more preferably 90% or more. Further, the haze of the sheet 1 of the present invention after peeling the peelable protective film 5 which is peeled off at the time of use is 20% or less, more preferably 10% or less, and further 5% or less. Preferred, 3% or less is particularly preferred, and 1% or less is even more preferred. The total light transmittance and the haze of the sheet 1 are the values obtained by measuring according to JIS K7378 "Plastic-How to determine the total light transmittance and the total light reflectance", respectively.

To ensure high transparency as described above, for example, the thickness of the glass fiber woven fabric 2, the difference in refractive index between the glass fiber woven fabric 2 and the curable resin layer 3, the average filament diameter of the glass fiber, the number of filaments, and the glass fiber. For example, adjusting the weaving density of the woven fabric 2 may be mentioned.

Since the sheet 1 of the present invention contains the glass fiber woven fabric 2, it can have a property of being hard to burn (non-combustible). The nonflammability of Sheet 1 of the present invention is 4.10.2 heat generation in the "Fireproof Performance Test / Evaluation Business Method Manual" (changed on March 1, 2014) of the Building Materials Testing Center. In the heat generation test in which the surface of the sheet is irradiated with radiant heat of 50 kW / m ² from the radiant electric heater, which is measured according to the test / evaluation method, the maximum heat generation rate after the start of heating is 200 kW / m ² continuously for 10 seconds or more. The total calorific value is 8 MJ / m ² or less. In order to further improve the nonflammability, for example, the mass of the curable resin layer 3 and the film layer 4 may be adjusted, a flame retardant may be added, or the amount of organic matter may be reduced.

The thickness of the sheet 1 of the present invention is, for example, the thickness of the sheet 1 after peeling the peelable protective film 5 that is peeled off during use (that is, the thickness excluding the peelable protective film 5 that is peeled off during use). As a), 100 to 500 μm, preferably 150 to 300 μm can be mentioned. Further, as the mass of the sheet 1 of the present invention, for example, the mass of the peelable protective film 5 that is peeled off during use is the mass of the sheet 1 after peeling (that is, the mass excluding the peelable protective film 5 that is peeled off during use). 100 to 500 g / m ² is mentioned, and 150 to 300 g / m ² is preferably mentioned. Further, in the sheet 1 of the present invention, when the total mass of the curable resin layer and the film layer is 150 to 300 g / m ² , more preferably 150 to 250 g / m ² , it is nonflammable and the sheet is supported, for example, a frame. It is preferable because it is easier to achieve both the suppression of the deterioration of visibility due to wrinkles when the film is attached to the above and the like.

In the sheet 1 of the present invention, if the film layer 4 is provided, the tear strength can be made higher. From the viewpoint of ensuring higher tear strength, the tear strength is preferably 30 to 100 (N), more preferably 40 to 100 (N), and particularly preferably 50 to 100 (N). In the present invention, the tear strength is measured and calculated as follows.
(Test method)
According to the C method (trapezoid method) of 7.16 of JIS R 3420: 2013, test pieces of 75 mm × 150 mm were collected from the sheet in the vertical and horizontal directions, respectively, and two trapezoidal parts including the right angle (in FIG. 5). Attach tape (trade name 600S manufactured by Sekisui Chemical Co., Ltd.) to both the front and back sides to prevent slipping (corresponding to the trapezoidal part A), and do not make any cuts. The maximum load is measured using the product name RTC-1310A), and the average value of the maximum load in the vertical direction and the maximum load in the horizontal direction (= (maximum load in the vertical direction (N) + maximum load in the horizontal direction (N)). )) / 2) is the tear strength (N).

The manufacturing method of the sheet 1 of the present invention is not particularly limited, and examples thereof include the following manufacturing methods. First, the above-mentioned glass fiber woven fabric 2 and an uncured curable resin composition constituting the curable resin layer 3 are prepared. The curable resin composition is applied to a film (for example, a polyester film) to be a film layer 4, a glass fiber woven fabric 2 is placed on the curable resin composition, and the glass fiber 2 is impregnated with the curable resin composition. Further, another film to be used as the film layer 4 is placed on the glass fiber woven fabric 2, and pressure is applied from the surfaces of the two film layers 4 to further impregnate the glass fiber woven fabric 2 with the curable resin composition. The curable resin composition is cured by heating or light irradiation, the glass fiber woven fabric 2 is impregnated with the curable resin layer 3, and the film layer 4 is laminated on the curable resin layer 3 to form a sheet 1 (film layer 4). / A sheet 1) laminated in the order of the curable resin layer 3 and the film layer 4 contained in the glass fiber woven fabric 2 in the impregnated state can be obtained. If the sheet 1 does not include the film layer 4, a protective film 5 that is peeled off at the time of use may be used instead of the film layer 4, and the protective film 5 may be peeled off.

Further, as a method for producing a sheet of the present invention, a glass fiber woven fabric, a photocurable resin layer contained in the glass fiber woven fabric in a state of being impregnated, and a film layer laminated on the photocurable resin layer are used. A step of preparing at least two light-transmitting thermoplastic resin films on which a light-transmitting protective film is laminated, and uncured light in which a glass fiber woven fabric is immersed. The uncured photocurable resin composition in a state where the curable resin composition is sandwiched between the two thermoplastic resin films obtained in the step A so that the light transmissive protective film is on the outside. It can include a step B of irradiating an object with light to cure the uncured photocurable resin composition.

2. 2. Air-conditioning system In the air-conditioning system of the present invention, a plurality of racks accommodating heat generating devices, an air conditioner, a cold aisle that sends cold air flowing from the air conditioner to the rack, and the cold air passing through the rack. An air-conditioning system including a hot aisle for flowing warm air warmed by an air conditioner and a sheet for separating the cold aisle and the hot aisle, wherein the sheet is impregnated with a glass fiber woven fabric and is contained in a cured state. Equipped with a sex resin layer, the total light transmittance is 80% or more, the haze is 20% or less, and the "Fireproof Performance Test / Evaluation Business Method Manual" of the Building Materials Testing Center (changed on March 1, 2014) In the heat generation test in which the surface of the sheet is irradiated with radiant heat of 50 kW / m ² from the radiant electric heater, which is measured according to the 4.10.2 heat generation test / evaluation method in the plate), the maximum heat generation rate after the start of heating is 10. The bending rigidity measured by the pure bending tester KES ^- FB2 ^- S manufactured by Kato Tech Co., Ltd. is 10 gf. It is cm ² / cm or more.

FIG. 6 is a schematic plan view illustrating an example of the air conditioning system of the present invention. In the air conditioning system of FIG. 6, a plurality of racks 101 accommodating heat generating devices, an air conditioner 102, and cold air flowing from the air conditioner 102 in the room 100 (in FIG. 6, the flow of cold air is indicated by white arrows. ) To the rack 101, a hot aisle 104 that flows warm air (indicated by an arrow hatching the flow of warm air in FIG. 6) that is warmed by the cold air passing through the rack 101, and cold. A panel 105 having the above-mentioned sheet 1 for partitioning the aisle 103 and the hot aisle 104 is provided. Examples of the heat generating device include a rack mount type server and a communication device. Further, in the panel 105, the sheet 1 of the present invention described above is supported by a support frame made of a material such as aluminum.

In FIG. 6, a plurality of racks 101 are connected to form a rack row, and the rack rows are arranged so as to face each other in the plurality of longitudinal directions at intervals. The exhaust surfaces of the pair of rack rows face each other, and the pair of exhaust surfaces and the panel 105 form a hot aisle 104.

In the present embodiment, the warm air flowing through the hot aisle 104 passes through a flow path (not shown) of the warm air above the hot aisle and is returned to the air conditioner 102. Here, in the panel 105, the warm air flowing through the hot aisle 104 flows to the cold aisle 103 without being returned to the air conditioner 102, and the cold air of the cold aisle 103 does not pass through the rack 101 to the hot aisle 104. Suppress the flow.

Further, in the air conditioning system of FIG. 6, an underfloor space is provided under the floor in the room 100, cold air flowing from the air conditioner 102 is passed through the underfloor space, and the floor near the intake side surface of the rack 101 in the cold aisle 103 is placed from the underfloor space. It is also possible to provide a ventilation port for sending the cold air in the room and allow the cold air to flow from the ventilation port to the intake port of the rack 101.

FIG. 7 is a schematic plan view illustrating an example of the air conditioning system of the present invention. In the air conditioning system of FIG. 7, a plurality of racks 101 accommodating heat generating devices, an air conditioner 102, and cold air flowing from the air conditioner 102 in the room 100 (in FIG. 6, the flow of cold air is indicated by white arrows. ) To the rack 101, a hot aisle 104 that flows warm air (indicated by an arrow hatching the flow of warm air in FIG. 6) that is warmed by the cold air passing through the rack 101, and cold. A panel 105 having the above-mentioned sheet 1 for partitioning the aisle 103 and the hot aisle 104 is provided.

In FIG. 7, a plurality of racks 101 are connected to form a rack row, and the rack rows are arranged so as to face each other in the plurality of longitudinal directions at intervals. The intake surfaces of the pair of rack rows face each other, and the pair of intake surfaces and the panel 105 form a cold aisle 103.

Further, in the air conditioning system of FIG. 7, an underfloor space is provided under the floor in the room 100, cold air flowing from the air conditioner 102 is passed through the underfloor space, and the floor near the intake side surface of the rack 101 in the cold aisle 103 is placed from the underfloor space. A ventilation port for sending the cold air can be provided in the room, and the cold air can flow from the ventilation port to the intake port of the rack 101.

In addition, in FIGS. 6 and 7, the panel 105 can completely shut off the cold aisle 103 and the hot aisle 104, and a part of the panel 105 is open, and the cold aisle 103 and the hot aisle 103 are hot due to the opening. It is also possible that the aisle 104 is spatially communicated with the opening. Further, the panel 105 may be provided with opening / closing means so that a watchman or a worker can move between the cold aisle 103 and the hot aisle 104.

Further, in the air conditioning system of the present invention, for example, as disclosed in FIG. 1 of Patent Document 1, a panel provided with the sheet 1 of the present invention can be used as a plate body extending from the upper end side of the rack row. Further, the above-mentioned warm air flow path (not shown) above the hot aisle 104 in FIG. 6 can be formed by a panel provided with the sheet 1 of the present invention.

Further, for example, in FIGS. 6 and 7, in the air conditioning system of the present invention, a surveillance camera is provided in either the cold aisle 103 or the hot aisle 104, and the other space in which the surveillance camera is not installed is monitored through the sheet 1. be able to.

Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples. However, the present invention is not limited to the examples.

The curable resin composition constituting the curable resin layer 3 impregnated in the glass fiber woven fabric 2 has the composition shown in Table 1 and is made of acrylic syrup (trade name "Acrysy Wrap XD-8005" manufactured by Ryokou Co., Ltd.). (Refractive index 1.550) and "Acrylic wrap XD-8006" (refractive index 1.570) mixed so as to have a mass ratio of 1: 1), vinyl ester resin (manufactured by Nippon Yupica Co., Ltd.), styrene. A mixture of a monomer (manufactured by Nippon Yupica Co., Ltd.), a bifunctional (meth) acrylate, and a photopolymerization initiator (Omnirad 184 manufactured by IGM) was used. As the bifunctional (meth) acrylate as the curing agent, NPGDA (neopentyl glycol diacrylate, molecular weight 212, (manufactured by Japan U-Pica Co., Ltd.)) shown in Table 1 was used. The amount of the photopolymerization initiator was 3 parts by mass with respect to 100 parts by mass of acrylic syrup or 100 parts by mass of the total of vinyl ester resin, styrene monomer and bifunctional (meth) acrylate.

<Example 1>
(Manufacturing of glass fiber woven fabric 2)
Weaving with an air jet loom using the trade name "ECC1200 1/0 1.0Z" (average filament diameter 4.5 μm, average number of filaments 100, twist number 1.0Z) manufactured by Unitica Fiberglass Co., Ltd. as warp and weft. , A plain weave glass fiber woven fabric (loom) having a warp density of 90 threads / 25 mm and a warp density of 90 threads / 25 mm was obtained. Then, the spinning sizing agent and the weaving sizing agent adhering to the obtained glass fiber woven fabric (living machine) were removed by heating at 400 ° C. for 30 hours. After that, the surface treatment agent silane coupling agent (S-350: N-vinylbenzyl-aminoethyl-γ-aminopropyltrimethoxysilane (hydrochloride) Chisso Co., Ltd.) was adjusted to a concentration of 15 g / L and squeezed with a padder roll. After that, it was dried and cured at 120 ° C. for 1 minute. Then, the glass fiber woven fabric 2 was obtained by performing a widening treatment once while setting the tension of the glass fiber woven fabric to 100 N / m in the warp direction by water flow processing at a pressure of 1.5 MPa. The obtained glass fiber woven fabric 2 had a warp density of 90 threads / 25 mm, a weft density of 90 threads / 25 mm, a thickness of 27 μm, a mass of 30 g / m ² , and a refractive index of 1.561.

(Film layer 4)
As the film layer 4, a commercially available biaxially stretched polyester film manufactured by Toyobo Co., Ltd. (trade name "Cosmo Shine (registered trademark) A4300", thickness 50 μm, mass 70 g / m ² , total light transmittance (JIS K 7105: 1981)). 93%, Haze (JIS K 7105: 1981) 0.9%) was used. Two film layers 4 were prepared.

(Manufacturing of sheets)
The curable resin composition shown in Table 1 as the curable resin layer 3 was applied to one side of one of the film layers 4. Next, the obtained glass fiber woven fabric 2 is placed on the curable resin composition to be the resin composition 3, allowed to stand for 1 minute, and the above-mentioned curable resin composition is left in the gaps of the glass fiber woven fabric 2. Was impregnated. Next, the other film layer 4 was placed and pressed from above the film layer 4 with a roller so that the mass of the curable resin layer 3 was 90 g / m ² . Then, a black light fluorescent lamp (trade name FL15BLB manufactured by Toshiba Corporation) is used to irradiate the curable resin composition to be the curable resin layer 3 through the film layer 4 (light irradiation condition: integrated light amount 200 mJ / cm). ² ) The curable resin composition is cured to form the curable resin layer 3, and the curable resin contained in the laminated structure (film layer 4 / glass fiber woven fabric 2 impregnated) exemplified in FIG. 2 is formed. A sheet as layer 3 / film layer 4) was obtained. In the obtained sheet, the gaps between the glass fibers of the glass fiber woven fabric are impregnated with the curable resin layer 3 (cured product of the resin composition), and the curable resin is on both sides of the layers of the glass fiber woven fabric. Layer 3 was formed.

<Example 2>
(Manufacturing of glass fiber woven fabric 2)
The glass fiber woven fabric to be the glass fiber woven fabric 2 was obtained by the same manufacturing method as in Example 1.

(Film layer 4)
As the film layer 4, a commercially available biaxially stretched polyester film manufactured by Toyobo Co., Ltd. (trade name "Cosmo Shine (registered trademark) A4300", thickness 75 μm, mass 105 g / m ² , total light transmittance (JIS K 7105: 1981)). 93%, Haze (JIS K 7105: 1981) 0.9%) was used. Two film layers 4 were prepared.

(Manufacturing of sheets)
The curable resin composition shown in Table 1 as the curable resin layer 3 was applied to one side of one of the film layers 4. Next, the obtained glass fiber woven fabric 2 is placed on the curable resin composition to be the resin composition 3, allowed to stand for 1 minute, and the above-mentioned curable resin composition is left in the gaps of the glass fiber woven fabric 2. Was impregnated. Next, the other film layer 4 was placed and pressed from above the film layer 4 with a roller so that the mass of the curable resin layer 3 was 70 g / m ² . Then, a black light fluorescent lamp (trade name FL15BLB manufactured by Toshiba Corporation) is used to irradiate the curable resin composition to be the curable resin layer 3 through the film layer 4 (light irradiation condition: integrated light amount 200 mJ / cm). ² ) The curable resin composition is cured to form the curable resin layer 3, and the curable resin contained in the laminated structure (film layer 4 / glass fiber woven fabric 2 impregnated) exemplified in FIG. 2 is formed. A sheet as layer 3 / film layer 4) was obtained. In the obtained sheet, the gaps between the glass fibers of the glass fiber woven fabric are impregnated with the curable resin layer 3 (cured product of the resin composition), and the curable resin is on both sides of the layers of the glass fiber woven fabric. Layer 3 was formed.

<Example 3>
(Manufacturing of glass fiber woven fabric 2)
The glass fiber woven fabric to be the glass fiber woven fabric 2 was obtained by the same manufacturing method as in Example 1.

(Film layer 4)
As the film layer 4, a commercially available biaxially stretched polyester film manufactured by Toyobo Co., Ltd. (trade name "Cosmo Shine (registered trademark) A4300", thickness 50 μm, mass 70 g / m ² , total light transmittance (JIS K 7105: 1981)). 93%, Haze (JIS K 7105: 1981) 0.9%) was used. Two film layers 4 were prepared.

(Manufacturing of sheets)
The curable resin composition shown in Table 1 as the curable resin layer 3 was applied to one side of one of the film layers 4. Next, the obtained glass fiber woven fabric 2 is placed on the curable resin composition to be the resin composition 3, allowed to stand for 1 minute, and the above-mentioned curable resin composition is left in the gaps of the glass fiber woven fabric 2. Was impregnated. Next, the other film layer 4 was placed and pressed from above the film layer 4 with a roller so that the mass of the curable resin layer 3 was 90 g / m ² . Then, a black light fluorescent lamp (trade name FL15BLB manufactured by Toshiba Corporation) is used to irradiate the curable resin composition to be the curable resin layer 3 through the film layer 4 (light irradiation condition: integrated light amount 200 mJ / cm). ² ) The curable resin composition is cured to form the curable resin layer 3, and the curable resin contained in the laminated structure (film layer 4 / glass fiber woven fabric 2 impregnated) exemplified in FIG. 2 is formed. A sheet as layer 3 / film layer 4) was obtained. In the obtained sheet, the gaps between the glass fibers of the glass fiber woven fabric are impregnated with the curable resin layer 3 (cured product of the resin composition), and the curable resin is on both sides of the layers of the glass fiber woven fabric. Layer 3 was formed.

<Example 4>
(Manufacturing of glass fiber woven fabric 2)
The glass fiber woven fabric to be the glass fiber woven fabric 2 was obtained by the same manufacturing method as in Example 1.

(Film layer 4)
As the film layer 4, a commercially available polyvinyl chloride resin film (manufactured by Okamoto Co., Ltd., general-purpose PVC # 320, thickness 100 μm, mass 120 g / m ² ) was used. Two film layers 4 were prepared.

(Manufacturing of sheets)
The curable resin composition shown in Table 1 as the curable resin layer 3 was applied to one side of one of the film layers 4. Next, the obtained glass fiber woven fabric 2 is placed on the curable resin composition to be the resin composition 3, allowed to stand for 1 minute, and the above-mentioned curable resin composition is left in the gaps of the glass fiber woven fabric 2. Was impregnated. Next, the other film layer 4 was placed and pressed from above the film layer 4 with a roller so that the mass of the curable resin layer 3 was 90 g / m ² . Then, a black light fluorescent lamp (trade name FL15BLB manufactured by Toshiba Corporation) is used to irradiate the curable resin composition to be the curable resin layer 3 through the film layer 4 (light irradiation condition: integrated light amount 200 mJ / cm). ² ) The curable resin composition is cured to form the curable resin layer 3, and the curable resin contained in the laminated structure (film layer 4 / glass fiber woven fabric 2 impregnated) exemplified in FIG. 2 is formed. A sheet as layer 3 / film layer 4) was obtained. In the obtained sheet, the gaps between the glass fibers of the glass fiber woven fabric are impregnated with the curable resin layer 3 (cured product of the resin composition), and the curable resin is on both sides of the layers of the glass fiber woven fabric. Layer 3 was formed.

<Comparative Example 1>
(Manufacturing of glass fiber woven fabric 2)
The glass fiber woven fabric to be the glass fiber woven fabric 2 was obtained by the same manufacturing method as in Example 1.

(Film layer 4)
As the film layer 4, a commercially available polyvinyl chloride resin film (manufactured by Okamoto Co., Ltd., general-purpose PVC # 320, thickness 130 μm, mass 156 g / m ² ) was used. Two film layers 4 were prepared.

(Manufacturing of sheets)
The curable resin composition shown in Table 1 as the curable resin layer 3 was applied to one side of one of the film layers 4. Next, the obtained glass fiber woven fabric 2 is placed on the curable resin composition to be the resin composition 3, allowed to stand for 1 minute, and the above-mentioned curable resin composition is left in the gaps of the glass fiber woven fabric 2. Was impregnated. Next, the other film layer 4 was placed and pressed from above the film layer 4 with a roller so that the mass of the curable resin layer 3 was 50 g / m ² . Then, a black light fluorescent lamp (trade name FL15BLB manufactured by Toshiba Corporation) is used to irradiate the curable resin composition to be the curable resin layer 3 through the film layer 4 (light irradiation condition: integrated light amount 200 mJ / cm). ² ) The curable resin composition is cured to form the curable resin layer 3, and the curable resin contained in the laminated structure (film layer 4 / glass fiber woven fabric 2 impregnated) exemplified in FIG. 2 is formed. A sheet as layer 3 / film layer 4) was obtained. In the obtained sheet, the gaps between the glass fibers of the glass fiber woven fabric are impregnated with the curable resin layer 3 (cured product of the resin composition), and the curable resin is on both sides of the layers of the glass fiber woven fabric. Layer 3 was formed.

<Comparative Example 2>
(Manufacturing of glass fiber woven fabric 2)
Weaving with an air jet loom using the trade name "ECD450 1/0 1.0Z" (average filament diameter 5.0 μm, average filament number 200, twist number 1.0Z) manufactured by Unitika Glass Fiber Co., Ltd. as warp and weft. , A plain weave glass fiber woven fabric (loom) having a warp density of 60 threads / 25 mm and a warp density of 60 threads / 25 mm was obtained. Then, the spinning sizing agent and the weaving sizing agent adhering to the obtained glass fiber woven fabric (living machine) were removed by heating at 400 ° C. for 30 hours. After that, the surface treatment agent silane coupling agent (S-350: N-vinylbenzyl-aminoethyl-γ-aminopropyltrimethoxysilane (hydrochloride) Chisso Co., Ltd.) was adjusted to a concentration of 15 g / L and squeezed with a padder roll. After that, it was dried and cured at 120 ° C. for 1 minute. Then, the glass fiber woven fabric was subjected to a widening treatment once while the tension of the glass fiber woven fabric was set to 100 N / m in the warp direction by water flow processing at a pressure of 1.5 MPa to obtain a glass fiber woven fabric to be the glass fiber woven fabric 2. The obtained glass fiber woven fabric 2 had a warp density of 60 threads / 25 mm, a weft density of 60 threads / 25 mm, a thickness of 50 μm, a mass of 53 g / m ² , and a refractive index of 1.561.

(Film layer 4)
As the film layer 4, a commercially available polyvinyl chloride resin film (manufactured by Okamoto Co., Ltd., general-purpose PVC # 320, thickness 100 μm, mass 120 g / m ² ) was used. Two film layers 4 were prepared.

(Manufacturing of sheets)
The curable resin composition shown in Table 1 as the curable resin layer 3 was applied to one side of one of the film layers 4. Next, the obtained glass fiber woven fabric 2 is placed on the curable resin composition to be the resin composition 3, allowed to stand for 1 minute, and the above-mentioned curable resin composition is left in the gaps of the glass fiber woven fabric 2. Was impregnated. Next, the other film layer 4 was placed and pressed from above the film layer 4 with a roller so that the mass of the curable resin layer 3 was 40 g / m ² . Then, a black light fluorescent lamp (trade name FL15BLB manufactured by Toshiba Corporation) is used to irradiate the curable resin composition to be the curable resin layer 3 through the film layer 4 (light irradiation condition: integrated light amount 200 mJ / cm). ² ) The curable resin composition is cured to form the curable resin layer 3, and the curable resin contained in the laminated structure (film layer 4 / glass fiber woven fabric 2 impregnated) exemplified in FIG. 2 is formed. A sheet as layer 3 / film layer 4) was obtained. In the obtained sheet, the gaps between the glass fibers of the glass fiber woven fabric are impregnated with the curable resin layer 3 (cured product of the resin composition), and the curable resin is on both sides of the layers of the glass fiber woven fabric. Layer 3 was formed.

<Comparative Example 3>
As the sheet of Comparative Example 3, a commercially available biaxially stretched polyester film manufactured by Toyobo Co., Ltd. (trade name "Cosmo Shine (registered trademark) A4300", thickness 75 μm, mass 105 g / m ² , total light transmittance (JIS K 7105:). 1981) 93%, Haze (JIS K 7105: 1981) 0.9%) were prepared.

<Comparative Example 4>
As the sheet of Comparative Example 4, a commercially available polyvinyl chloride resin film (manufactured by Okamoto Co., Ltd., general-purpose PVC # 320, thickness 100 μm, mass 120 g / m ² ) was used.

In Examples and Comparative Examples, the weaving density of the glass fiber woven fabric was measured and calculated according to JIS R 3420 2013 7.9. The thickness of the glass fiber woven fabric was measured and calculated according to the JIS R 3420 2013 7.10.1A method. The mass of the glass fiber woven fabric was measured and calculated according to JIS R 3420 2013 7.2. The refractive index of the curable resin layer 3 and the glass fiber woven fabric 2 was measured and calculated by the above-mentioned method. The Abbe numbers of the curable resin layer 3 and the glass fiber woven fabric 2 were measured and calculated by the above method.

(Tear strength)
This was done by the method described above.

(Flexural rigidity)
This was done by the method described above.

(Wrinkles when attached to the frame)
A sheet cut out to a length of 1.5 m and a width of 1 m is attached to an aluminum frame on a rectangular frame with a long side of 1.5 m and a short side of 1 m, and both ends of the long side of the frame are lifted by hand for observation. However, the occurrence of wrinkles on the sheet was evaluated according to the following criteria.
◯: No wrinkles were generated, and there was no problem in appearance and visibility.
X: Wrinkles were generated, and the level was such that there was a problem in appearance and visibility.

(Non-combustible evaluation)
From the radiant electric heater measured according to 4.10.2 heat generation test / evaluation method in "Fireproof performance test / evaluation work method manual" (changed version on March 1, 2014) of the Building Materials Testing Center. In the heat generation test in which the surface of the sheet is irradiated with radiant heat of 50 kW / m ² , (I) the maximum heat generation rate does not exceed 200 kW / m ² continuously for 10 seconds or more for 20 minutes after the start of heating, and (II) the start of heating. If the total calorific value for the next 20 minutes is 8 MJ / m ² or less, and (III) there is no through hole of 0.5 mm square or more for 20 minutes after the start of heating, ○, the above three (I) to (III) If any of the requirements were not satisfied, it was evaluated as x.

The evaluation results are shown in Table 1.

The sheets of Examples 1 to 4 are provided with a curable resin layer impregnated in a glass fiber woven fabric, have a total light transmittance of 80% or more, a haze of 20% or less, and are a building material test center. From the radiant electric heater to the surface of the sheet, 50 kW / In the heat generation test that irradiates m ² radiant heat, the maximum heat generation rate after the start of heating does not exceed 200 kW / m ² continuously for 10 seconds or more, the total calorific value is 8 MJ / m ² or less, and Katou Tech Since the bending rigidity measured by the pure bending tester KES-FB2-S manufactured by Co., Ltd. is 10 gf · cm ² / cm or more, visibility due to wrinkles can be seen even when attached to a support frame or the like. It suppressed the decrease and had the property of being hard to burn. Since the sheets of Examples 1 to 4 have the above-mentioned effects, a plurality of racks accommodating heat generating devices, an air conditioner, a cold aisle that sends cold air flowing from the air conditioner to the rack, and the above. In an air conditioning system including a hot aisle for flowing warm air, which is warmed by passing cold air through the rack, it can be suitably used as a member for partitioning a cold aisle and a hot aisle.

On the other hand, the sheets of Comparative Examples 1 and 2 were attached to a support frame or the like because the bending rigidity measured by the pure bending tester KES-FB2-S manufactured by Kato Tech Co., Ltd. was less than 10 gf · cm ² / cm. Even when used in the same way, it was not possible to suppress the deterioration of visibility due to wrinkles. Since the sheets of Comparative Examples 1 and 2 cannot suppress the deterioration of visibility due to wrinkles, a plurality of racks accommodating heat generating devices, an air conditioner, and cold air flowing from the air conditioner are used. Is suitably used as a member for partitioning a cold aisle and a hot aisle in an air conditioning system including a cold aisle that sends the cold air to the rack and a hot aisle that flows warm air that is warmed by the cold air passing through the rack. It was something I couldn't do.

1 ... Sheet 2 ... Glass fiber woven fabric 3 ... Curable resin layer 31, 32 ... Surface side portion of the curable resin layer 4 ... Film layer 41, 42 ... Surface of the film layer Side part 5 ... Detachable protective film that can be peeled off during use 6 ... Antistatic layer 100 ... Room 101 ... Rack 102 ... Air conditioner 103 ... Cold aisle 104 ... Hot Isle 105 ・ ・ ・ Panel

Claims (3)

A plurality of racks accommodating heat generating devices, an air conditioner, a cold aisle that sends cold air flowing from the air conditioner to the rack, and a hot aisle that flows warm air that is warmed by the cold air passing through the rack. A sheet used to separate the cold aisle and the hot aisle in a room provided with the above.
The sheet is provided with a curable resin layer impregnated in a glass fiber woven fabric, has a total light transmittance of 80% or more, a haze of 20% or less, and has "fireproof performance" of the Building Materials Testing Center. 4.10.2 Radiation heat of 50kW / m ² from the radiant electric heater to the surface of the sheet, which is measured according to the heat generation test / evaluation method in "Test / Evaluation Business Method Manual" (revised on March 1, 2014). In the heat generation test to irradiate, the maximum heat generation rate after the start of heating does not exceed 200 kW / m ² continuously for 10 seconds or more, the total calorific value is 8 MJ / m ² or less, and it is purely manufactured by Kato Tech Co., Ltd. A sheet having a bending rigidity of 10 gf · cm ² / cm or more measured by a bending tester KES-FB2-S. A plurality of racks accommodating heat generating devices, an air conditioner, a cold aisle that sends cold air flowing from the air conditioner to the rack, and a hot aisle that flows warm air that is warmed by the cold air passing through the rack. An air conditioning system including a seat for separating the cold aisle and the hot aisle.
The sheet is provided with a curable resin layer impregnated in a glass fiber woven fabric, has a total light transmittance of 80% or more, a haze of 20% or less, and has "fireproof performance" of the Building Materials Testing Center. 4.10.2 Radiation heat of 50kW / m ² from the radiant electric heater to the surface of the sheet, which is measured according to the heat generation test / evaluation method in "Test / Evaluation Business Method Manual" (revised on March 1, 2014). In the heat generation test to irradiate, the maximum heat generation rate after the start of heating does not exceed 200 kW / m ² continuously for 10 seconds or more, the total calorific value is 8 MJ / m ² or less, and it is purely manufactured by Kato Tech Co., Ltd. An air conditioning system having a bending rigidity of 10 gf · cm ² / cm or more measured by a bending tester KES-FB2-S. A plurality of racks accommodating heat generating devices, an air conditioner, a cold aisle that sends cold air flowing from the air conditioner to the rack, and a hot aisle that flows warm air that is warmed by the cold air passing through the rack. A method for suppressing wrinkles of the sheet in an air conditioning system including a sheet for partitioning the cold aisle and the hot aisle.
The sheet is provided with a curable resin layer impregnated in a glass fiber woven fabric, has a total light transmittance of 80% or more and a haze of 20% or less. 4.10.2 Radiation heat of 50kW / m ² from the radiant electric heater to the surface of the sheet, which is measured according to the heat generation test / evaluation method in "Test / Evaluation Business Method Manual" (revised on March 1, 2014). In the heat generation test to irradiate, the maximum heat generation rate after the start of heating does not exceed 200 kW / m ² continuously for 10 seconds or more, the total calorific value is 8 MJ / m ² or less, and it is purely manufactured by Kato Tech Co., Ltd. A wrinkle suppressing method using a sheet having a bending rigidity of 10 gf · cm ² / cm or more measured by a bending tester KES-FB2-S.

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