Transparent Fireproof Plastic Sheet

Abstract

To provide a transparent fireproof plastic board that includes an intermediate plastic substrate and two fireproof reinforcing layers respectively formed on two opposite surfaces of the intermediate plastic substrate.SOLUTION: The intermediate plastic substrate has a first visible light transmittance of 80% or more, and has a flame resistance grade of V0 within a thickness ranging from 0.8 mm to 6.4 mm according to UL94 testing standard. Each of the fireproof reinforcing layers has a second visible light transmittance of 80% or more, and forms a carbon protective layer after being heated at a high temperature. The transparent fireproof plastic board conforms to a flame resistance grade of level 2 according to CNS 14705-1 testing standard.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to plastic sheeting, and more particularly to transparent, fire-resistant plastic sheeting. [Background technology]

[0002] In conventional technology, architectural fireproof boards are often made of board materials that are not light-transmitting. Existing fireproof boards have no light-transmitting property or have low light-transmittance, which reduces the lighting and sense of space inside a room. While light-transmitting fireproof board materials are commercially available, their fireproof performance needs to be further improved. Therefore, the inventors, in light of the possibility of improving the above-mentioned problems, conducted extensive research and applied scientific theory, and arrived at the present invention as a method that is rational in design and can effectively improve the above-mentioned problems. Summary of the Invention [Problem to be solved by the invention]

[0003] The technical problem that the present invention aims to solve is to provide a transparent fire-resistant plastic sheet that addresses the shortcomings of the prior art. [Means for solving the problem]

[0004] To solve the above technical problems, one technical solution adopted by the present invention is to provide a transparent fire-resistant plastic sheet that meets the flame-retardant grade level 2 standard of CNS 14705-1. The transparent fire-resistant plastic sheet includes an intermediate plastic substrate and two fire-resistant reinforcement layers formed on both sides of the intermediate plastic substrate, where the intermediate plastic substrate has a first visible light transmittance of 80% or more and a flame-retardant grade of V0 according to the UL94 flame test from a thickness of 0.8 mm to 6.4 mm. Each of the fire-resistant reinforcement layers has a second visible light transmittance of 80% or more and is formed as a carbon protective layer after being subjected to high temperatures.

[0005] Preferably, the thermal conductivity of the carbon protective layer is such that ... Guidance The thermal conductivity of the fire-retardant layer is lower than that of the layer before it is subjected to high-temperature heating, so as to reduce the rate of fire.

[0006] Preferably, the intermediate plastic substrate has a flame retardancy rating of V0 according to the UL94 flame test from 1.2 mm to 3.2 mm in thickness.

[0007] Preferably, the plastic material in the intermediate plastic substrate is at least one selected from the group consisting of polyethylene terephthalate, polycarbonate, polyetherimide, polyarylate, polyethersulfone, and polysulfone.

[0008] Preferably, the intermediate plastic substrate has a first thickness of 1.0 mm to 30 mm, and each of the fire-resistant reinforcing layers has a second thickness, the second thickness being 0.0005 to 0.25 times the first thickness.

[0009] Preferably, each of the fire-retardant reinforcing layers is a coating layer formed by application on the surface of the intermediate plastic substrate.

[0010] Preferably, the carbon protective layer is formed of the coating layer and has a foam structure, and the carbon protective layer has a third thickness, which is 5 to 30 times the second thickness.

[0011] Preferably, the coating layer is formed of an organic paint or an inorganic paint, the organic paint containing an amino resin, the amino resin being at least one selected from the group consisting of aniline, dicyandiamide, melamine, diammonium phosphate, and ammonium polyphosphate, and the inorganic paint containing a silicate, the silicate being at least one selected from the group consisting of sodium silicate, potassium silicate, and calcium silicate.

[0012] Preferably, each of the fire-retardant reinforcing layers is a film formed on the surface of the intermediate plastic substrate by thermocompression bonding.

[0013] Preferably, the film is a fluorine-containing polymer film, and the fluorine-containing polymer film is at least one selected from the group consisting of a polyvinyl fluoride film, a polyvinylidene fluoride film, a perfluoroalkoxyalkane film, and a tetrafluoroethylene-hexafluoropropylene copolymer film.

[0014] Preferably, each of the fire-resistant reinforcement layers has a laminated structure comprising a film formed by thermocompression directly onto the surface of the intermediate plastic substrate and a coating layer formed by application on the surface of the film away from the intermediate plastic substrate, wherein the film is a fluorine-containing polymer film and the coating layer is formed from an organic paint containing an amino resin or an inorganic paint containing a silicate. [Effects of the Invention]

[0015] The advantageous effects of the present invention include the following technical features of the transparent fire-resistant plastic sheet of the present invention: "The transparent fire-resistant plastic sheet meets the flame-retardant grade level 2 of CNS 14705-1," "The intermediate plastic substrate has a first visible light transmittance of 80% or more and a flame-retardant grade of V0 according to the UL94 flammability test for thicknesses from 0.8 mm to 6.4 mm," and "Each of the two fire-resistant reinforcement layers formed on both sides of the intermediate plastic substrate has a second visible light transmittance of 80% or more and forms a carbon protective layer after being exposed to high temperatures." Due to these technical features, the transparent fire-resistant plastic sheet has high transparency and high fire resistance, and can be used in a wider range of applications (specifically, fire-resistant building materials, partition panels, ceilings, etc.), such as partition panels or ceilings for hot aisle and cold aisle containment systems in data centers (server rooms). [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a schematic diagram of a transparent fireproof plastic sheet having a laminated structure according to a first embodiment of the present invention. FIG. [Figure 2] 2 is a schematic diagram showing the formation of a carbon protective layer on the transparent fireproof plastic sheet according to the first embodiment of the present invention after it is subjected to high temperature. FIG. [Figure 3] FIG. 2 is a schematic diagram of a transparent fireproof plastic sheet having a laminated structure according to a second embodiment of the present invention. [Figure 4] 4 is a schematic diagram showing the formation of a carbon protective layer on the transparent fireproof plastic sheet according to the second embodiment of the present invention after it is subjected to high temperatures. FIG. [Figure 5] FIG. 2 is a schematic diagram of a transparent fireproof plastic sheet having a laminated structure according to a third embodiment of the present invention. [Figure 6] 4 is a schematic diagram showing the formation of a carbon protective layer on the transparent fireproof plastic sheet according to the third embodiment of the present invention after being subjected to high temperatures. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017] To better understand the features and technical contents of the present invention, please refer to the following detailed description of the present invention and the accompanying drawings, which are provided for reference and explanation only and are not intended to limit the scope of the present invention.

[0018] Hereinafter, the embodiments of the "transparent fire-resistant plastic sheet" according to the present invention will be described with reference to certain specific embodiments, and those skilled in the art will be able to understand the advantages and effects of the present invention based on the contents disclosed in this specification.

[0019] As previously explained, the accompanying drawings of the present invention are for simple schematic illustrations and are not drawn to actual size. The present invention can be implemented or applied in other different specific embodiments, and various modifications and changes can be made to the details in this specification based on different perspectives and applications without departing from the concept of the present invention. The technical contents of the present invention will be described in more detail based on the following embodiments, but the disclosed contents do not limit the protection scope of the present invention.

[0020] It should be understood that although terms such as "first," "second," and "third" may be used herein to describe various materials or parameters, these materials or parameters are not limited by these terms, but are primarily used to distinguish one material from another or one parameter from another.

[0021] Furthermore, the term "or" as used herein may include any one or more combinations of the associated listed items, depending on the actual circumstances.

[0022] [First embodiment] As shown in Figures 1 and 2, a first embodiment of the present invention provides a transparent fire-resistant plastic sheet 100A.

[0023] Here, Fig. 1 is a schematic diagram showing the layer structure of the transparent fire-resistant plastic sheet 100A according to the first embodiment of the present invention before being subjected to high temperature, and Fig. 2 is a schematic diagram showing the layer structure of the transparent fire-resistant plastic sheet 100A according to the first embodiment of the present invention after being subjected to high temperature, on which the carbon protective layer 2a is formed.

[0024] 1, the transparent fire-resistant plastic sheet 100A includes an intermediate plastic substrate 1 and two fire-resistant reinforcing layers 2. The two fire-resistant reinforcing layers 2 are formed on both sides of the intermediate plastic substrate 1, respectively.

[0025] The intermediate plastic substrate 1 is a plastic plate having specific material properties.

[0026] More specifically, the first visible light transmittance (VLT) of the intermediate plastic substrate 1 is 80% or more. The intermediate plastic substrate 1 has a flame retardancy grade of V0 according to the UL94 flame test for a thickness of 0.8 mm to 6.4 mm. Preferably, the intermediate plastic substrate 1 achieves a flame retardancy grade of V0 according to the UL94 flame test for a thickness of 1.2 mm to 3.2 mm (particularly preferably 1.6 mm).

[0027] It should be noted that the UL94 flame test mentioned in the embodiments of the present invention is measured according to the standard test method of "IEC 60695-11-10 Standard Vertical Flame Test."

[0028] The intermediate plastic substrate 1 has a first thickness T1, which is in the range of 1.0 mm to 30 mm, and preferably in the range of 3 mm to 20 mm.

[0029] In one embodiment of the present invention, the plastic material of the intermediate plastic substrate 1 is at least one selected from the group consisting of polyethylene terephthalate (PET), polycarbonate (PC), polyetherimide (PEI), polyarylate (PAR), polyethersulfone (PES), and polysulfone (PSU).

[0030] In addition, flame retardants are further dispersed in the plastic material of the transparent fireproof plastic sheet 1.

[0031] The flame retardant may be at least one selected from the group consisting of inorganic flame retardants, halogen-based flame retardants, borate-based flame retardants, phosphorus-based flame retardants, nitrogen-containing flame retardants, intumescent flame retardants, and silicone flame retardants. In one specific embodiment, the plastic material of the intermediate plastic substrate 1 is polyethylene terephthalate, and the flame retardant is a phosphorus-based flame retardant, but the present invention is not limited thereto.

[0032] In the present invention, if the intermediate plastic substrate 1 has the above-mentioned visible light transmittance and UL94 flame retardancy, it is protected by the present invention and is included in the scope of the claims of the present invention.

[0033] It is worth noting that the intermediate plastic substrate 1 is a sheet material formed by extrusion molding, and the extrusion temperature in the extrusion molding is 240°C to 400°C, but the present invention is not limited to this.

[0034] Furthermore, as shown in FIG. 1, each of the fire-resistant reinforcement layers 2 is a transparent fire-resistant coating layer formed on the surface of the intermediate plastic substrate 1 by coating.

[0035] Here, the second visible light transmittance of the fireproof layer 2 is 80% or more. The fireproof layer 2 also has a second thickness T2. The second thickness is 0.0005 to 0.25 times the first thickness of the intermediate plastic substrate 1. More specifically, the second thickness T2 of the fireproof layer 2 is 10 μm to 800 μm.

[0036] To explain further, as shown in FIG. 2, each of the fire-resistant reinforced layers 2 can be formed as a carbon protective layer 2a by being subjected to high temperature (for example, high temperature of 150°C to 1500°C) in an atmospheric atmosphere. The carbon protective layer 2a covers the surface of the intermediate plastic substrate 1, and the thermal conductivity of the carbon protective layer 2a is lower than the thermal conductivity of the fire-resistant reinforced layer 2 before being heated at high temperature. This improves the thermal conductivity to the central plastic substrate 1. GuidanceBy slowing down the speed, the flammability of the surface of the plastic plate 100A is reduced. In this embodiment, the carbon protective layer 2a has a foamed structure and a third thickness T3. The third thickness T3 is 5 to 30 times, and preferably 10 to 30 times, the second thickness T2 (i.e., the thickness of the fireproof reinforced layer 2 before it is heated at a high temperature).

[0037] In other words, the fire-resistant reinforced layer 2 expands when heated at high temperatures and is formed as a carbon protective layer 2a (carbon foam heat insulating material) having a foam structure, thereby providing a heat insulating effect to the intermediate plastic substrate 1.

[0038] The carbon protective layer 2a formed by high-temperature heating has a third visible light transmittance lower than the second visible light transmittance, and the third visible light transmittance may be, for example, less than 70%, but the present invention is not limited thereto. It should be noted that the first, second, and third "visible light transmittances" according to the embodiments of the present invention are measured, for example, according to "ASTM D1003 Standard Test for Haze and Light Transmittance of Transparent Plastics."

[0039] Furthermore, as shown in FIG. 1, each of the fire-resistant reinforcing layers 2 is a transparent fire-resistant coating layer formed by coating using an organic paint or an inorganic paint.

[0040] In one embodiment of the present invention, the organic coating comprises an amino resin, and the amino resin may be at least one selected from the group consisting of aniline, dicyandiamide, melamine, diammonium phosphate, and ammonium polyphosphate.

[0041] In one embodiment of the present invention, the inorganic paint contains a silicate, and the silicate may be at least one selected from the group consisting of sodium silicate, potassium silicate, and calcium silicate.

[0042] After being subjected to high temperatures, the material reacts with carbon dioxide in the air to form a carbon protective layer 2a having a foam structure. In one embodiment of the present invention, a carbon-forming substance may be further added to the fire-resistant reinforcing layer 2. Examples of carbon-forming substances include carbon-rich multi-hydroxy compounds and organic resins having hydroxyl groups, but the present invention is not limited thereto.

[0043] To further explain, due to the laminate design of the intermediate plastic substrate 1 and the two fire-retardant reinforcement layers 2, the transparent fire-resistant plastic sheet 100A according to the embodiment of the present invention passes the flame retardancy grade of level 2 according to CNS 14705-1.

[0044] Here, CNS 14705-1 is "Test method for combustion heat release rate of building materials."

[0045] The transparent fire-resistant plastic sheet 100A according to the embodiment of the present invention has a visible light transmittance of 80% or more and can be used in fire-resistant building materials, partition panels, ceilings, etc., such as partition panels or ceilings in hot aisle and cold aisle containment systems in data centers (server rooms).

[0046] It is worth noting that the transparent fire-resistant plastic sheet 100A according to the embodiment of the present invention has better flame retardancy due to the laminated structure design of the intermediate plastic substrate 1 and the two fire-resistant reinforcing layers 2.

[0047] If the fire-retardant reinforcement layer 2 is not formed on both sides of the intermediate plastic substrate 1, the product cannot meet the standard of CNS 14705-1.

[0048] [Second embodiment] As shown in Figures 3 and 4, a second embodiment of the present invention provides a transparent fire-resistant plastic sheet 100B.

[0049] Here, Fig. 3 is a schematic diagram showing the layer structure of the transparent fire-resistant plastic sheet 100B according to the second embodiment of the present invention before being subjected to high temperature, and Fig. 4 is a schematic diagram showing the layer structure of the transparent fire-resistant plastic sheet 100B according to the second embodiment of the present invention after being subjected to high temperature and on which the carbon protective layer 2a' is formed.

[0050] 3, the transparent fire-resistant plastic sheet 100B includes an intermediate plastic substrate 1 and two fire-resistant reinforcing layers 2', which are formed on both sides of the intermediate plastic substrate 1, respectively.

[0051] The first visible light transmittance of the intermediate plastic substrate 1 is 80% or more.

[0052] The intermediate plastic substrate 1 has a flame retardancy grade of V0 according to the UL94 flame test in the thickness range of 0.8 mm to 6.4 mm.

[0053] The intermediate plastic substrate 1 has a first thickness T1, which is 1.0 mm to 30 mm.

[0054] The other material characteristics of the intermediate plastic substrate 1 are similar to those of the first embodiment, and therefore will not be described here again.

[0055] 3, each of the fire-resistant reinforced layers 2' is a transparent fire-resistant film formed by thermocompression bonding on the surface of the intermediate plastic substrate 1. Here, the thermocompression bonding temperature for thermocompression bonding the transparent fire-resistant film to the surface of the intermediate plastic substrate 1 is 190°C to 400°C.

[0056] The second visible light transmittance of the fireproof layer 2' is 80% or more. Each of the fireproof layer 2' has a second thickness T2. The second thickness T2 is 0.0005 to 0.25 times the first thickness T1. More specifically, the second thickness T2 of the fireproof layer 2' is 10 μm to 800 μm, and preferably 50 μm to 500 μm.

[0057] To explain further, as shown in FIG. 4, each of the fire-resistant reinforced layers 2' does not spontaneously combust even when exposed to high temperatures (for example, high temperatures of 350°C to 1000°C) in the air, and can form a carbon protective layer 2a'. The carbon protective layer 2a' covers the surface of the intermediate plastic substrate 1, and the thermal conductivity of the carbon protective layer 2a' is lower than the thermal conductivity of the fire-resistant reinforced layer 2' before it is exposed to high temperatures. This reduces the heat transfer to the central plastic substrate 1. Guidance By slowing down the speed, the flammability of the surface of the plastic plate 100B is reduced.

[0058] In this embodiment, the carbon protective layer 2a' formed after being subjected to high temperatures expands slightly in thickness (for example, by 50% or more) and has high flame retardancy.

[0059] 3, the transparent fireproof film of the fireproof reinforcing layer 2' is a fluorine-containing polymer film. In one embodiment of the present invention, the fluorine-containing polymer film is at least one selected from the group consisting of a polyvinylene fluoride (PVF) film, a polyvinylidene difluoride (PVDF) film, a perfluoroalkoxy alkane (PFA) film, and a tetrafluoroethylene-hexafluoropropylene copolymer (fluorinated ethylenepropylene (FEP)) film.

[0060] To further explain, due to the laminate design of the intermediate plastic substrate 1 and the two fire-retardant reinforcement layers 2', the transparent fire-resistant plastic sheet 100B according to the embodiment of the present invention passes the flame retardancy grade of level 2 according to CNS 14705-1.

[0061] [Third embodiment] As shown in FIGS. 5 and 6, a third embodiment of the present invention provides a transparent fire-resistant plastic sheet 100C.

[0062] Here, Fig. 5 is a schematic diagram showing the layer structure of the transparent fire-resistant plastic sheet 100C according to the third embodiment of the present invention before being subjected to high temperature, and Fig. 6 is a schematic diagram showing the layer structure of the transparent fire-resistant plastic sheet 100C according to the third embodiment of the present invention after being subjected to high temperature and on which a carbon protective layer is formed.

[0063] 5, the transparent fire-resistant plastic sheet 100C includes an intermediate plastic substrate 1 and two fire-resistant reinforcement layers, which are formed on both sides of the intermediate plastic substrate 1, respectively.

[0064] The difference between this embodiment and the previous embodiment is that each of the fire-reinforcing layers has a laminated structure including a first fire-reinforcing layer 2′ and a second fire-reinforcing layer 2.

[0065] Here, the first fireproof reinforced layer 2' is the transparent fireproof film (for example, polyvinyl fluoride film) according to the second embodiment, and is directly bonded to the surface of the intermediate plastic substrate 1 by thermocompression bonding.

[0066] Furthermore, the second fire-resistant reinforced layer 2 is a transparent fire-resistant reinforced coating layer according to the first embodiment, and is formed by application directly on the surface of the first fire-resistant reinforced layer 2' (i.e., the transparent fire-resistant film) away from the intermediate plastic substrate 1.

[0067] To explain further, as shown in FIG. 6, each of the fire-resistant reinforced layers (including 2 and 2') can be subjected to high temperatures (for example, high temperatures of 150°C to 1500°C) in the air, and then carbon protective layers 2a and 2a' can be formed thereon. The carbon protective layers 2a and 2a' cover the surface of the intermediate plastic substrate 1 and also act as heat transfer layers to the central plastic substrate 1. Guidance The slower speed reduces the flammability of the surface of the plastic plate 100C.

[0068] To further explain, due to the laminate design of the intermediate plastic substrate 1, the fire-retardant reinforcement layer 2, and the fire-retardant reinforcement layer 2', the transparent fire-resistant plastic sheet 100C according to an embodiment of the present invention passes the level 2 flame retardancy grade according to CNS 14705-1.

[0069] [Advantageous Effects of the Embodiments] The advantageous effects of the present invention include the following technical features of the transparent fire-resistant plastic sheet of the present invention: "It meets the flame-retardant grade level 2 standard according to CNS 14705-1," "The intermediate plastic substrate has a first visible light transmittance of 80% or more and a flame-retardant grade of V0 according to the UL94 flame test for thicknesses from 0.8 mm to 6.4 mm," and "Each of the two fire-resistant reinforcement layers formed on both sides of the intermediate plastic substrate has a second visible light transmittance of 80% or more and forms a carbon protective layer after being exposed to high temperatures." Due to these technical features, the transparent fire-resistant plastic sheet has high transparency and fire resistance, and can be used in a wider range of applications (specifically, fire-resistant building materials, partition panels, ceilings, etc.), such as partition panels or ceilings for hot aisle and cold aisle containment systems in data centers (server rooms).

[0070] The above disclosure is merely a preferred embodiment of the present invention, and the scope of the claims of the present invention is not limited thereto. Therefore, all equivalent technical modifications made using the specification and drawings of the present invention are included in the scope of the claims of the present invention. [Explanation of symbols]

[0071] 100A, 100B, 100C...Transparent fireproof plastic sheet 1...Intermediate plastic substrate 2,2'...fireproof reinforcement layer, first fireproof reinforcement layer, second fireproof reinforcement layer 2a, 2a'...Carbon protective layer T1...first thickness T2...second thickness T3...Third thickness

Claims

1. A transparent fire-resistant plastic sheet that meets the flame retardant grade level 2 according to CNS 14705-1, The transparent fire-resistant plastic sheet comprises an intermediate plastic substrate and two fire-resistant reinforcement layers formed on both sides of the intermediate plastic substrate, respectively; the intermediate plastic substrate has a first visible light transmittance of 80% or more, and a flame retardancy grade of V0 according to a UL94 combustion test from a thickness of 0.8 mm to 6.4 mm; the intermediate plastic substrate includes a plastic material and a flame retardant; the plastic material is at least one selected from the group consisting of polyethylene terephthalate, polycarbonate, polyetherimide, polyarylate, polyethersulfone, and polysulfone; and the flame retardant is at least one selected from the group consisting of an inorganic flame retardant, a halogen-based flame retardant, a borate-based flame retardant, a phosphorus-based flame retardant, a nitrogen-containing flame retardant, an intumescent flame retardant, and a silicone flame retardant; Each of the fire-retardant reinforcing layers includes a coating layer formed of an organic paint or an inorganic paint, and / or a fluorine-containing polymer film, and has a second visible light transmittance of 80% or more, and each of the fire-retardant reinforcing layers is formed as a carbon protective layer after being subjected to high temperatures; the organic coating comprises an amino resin, and the inorganic coating comprises a silicate; A transparent fire-resistant plastic sheet, characterized in that the intermediate plastic substrate has a first thickness of 1.0 mm to 30 mm, and each of the fire-resistant reinforcing layers has a second thickness, the second thickness being 0.0005 to 0.25 times the first thickness.

2. 2. The transparent fire-resistant plastic sheet of claim 1, wherein the thermal conductivity of the carbon protective layer is lower than the thermal conductivity of the fire-resistant reinforcement layer before being subjected to high-temperature heating so as to reduce the rate of heat conduction to the intermediate plastic substrate.

3. 2. The transparent fire-resistant plastic sheet according to claim 1, wherein the intermediate plastic substrate has a flame retardancy rating of V0 according to the UL94 flame test from a thickness of 1.2 mm to 3.2 mm.

4. 2. The transparent fire-resistant plastic sheet according to claim 1, wherein each of the fire-resistant reinforcing layers is a coating layer formed by application on the surface of the intermediate plastic substrate.

5. 5. The transparent fire-resistant plastic sheet according to claim 4, wherein the carbon protective layer is formed of the coating layer and has a foam structure, and the carbon protective layer has a third thickness, which is 5 to 30 times the second thickness.

6. The amino resin is at least one selected from the group consisting of aniline, dicyandiamide, melamine, diammonium phosphate, and ammonium polyphosphate; 5. The transparent, fire-resistant plastic sheet according to claim 4, wherein the silicate is at least one selected from the group consisting of sodium silicate, potassium silicate, and calcium silicate.

7. A transparent fire-resistant plastic sheet as described in claim 1, wherein the fluorine-containing polymer film is at least one selected from the group consisting of polyvinyl fluoride film, polyvinylidene fluoride film, perfluoroalkoxyalkane film, and tetrafluoroethylene-hexafluoropropylene copolymer film.

8. 2. The transparent fire-resistant plastic sheet of claim 1, wherein each of the fire-resistant reinforcement layers has a laminated structure comprising the fluorine-containing polymer film formed by thermocompression directly onto the surface of the intermediate plastic substrate, and the coating layer formed by application on the side of the fluorine-containing polymer film away from the intermediate plastic substrate.

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