Transparent fireproof plastic board

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 a plastic sheet, and more particularly to a transparent fireproof plastic sheet.

Background Art

[0002] In the prior art, building fireproof boards are often made of materials without light transmittance. Since existing fireproof boards have no light transmittance or a low light transmittance, the daylighting and spatial perception indoors are reduced. Although fireproof boards with light transmittance are also commercially available, it is necessary to further improve their fireproof performance. Therefore, in view of the fact that the above problems can be improved, the inventors have conducted intensive research and combined theory. As a result, the present invention has been achieved as a method with a reasonable design that can effectively improve the above problems.

Summary of the Invention

Problems to be Solved by the Invention

[0003] The technical problem to be solved by the present invention is to provide a transparent fireproof plastic sheet to address the deficiencies of the prior art.

Means for Solving the Problems

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

[0005] Preferably, the thermal conductivity of the carbon protective layer is lower than the thermal conductivity before the high-temperature heating of the fireproof reinforcing layer so as to reduce the rate of heat transfer to the intermediate plastic substrate.

[0006] Preferably, the intermediate plastic substrate has a thickness of 1.2 mm to 3.2 mm and a flame retardant grade of V0 according to the UL94 combustion test.

[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 first thickness of the intermediate plastic substrate is 1.0 mm to 30 mm, each of the fireproof reinforcing layers has a second thickness, and the second thickness is 0.0005 times to 0.25 times the first thickness.

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

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

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

[0012] Preferably, each of the fireproof reinforcement layers is a film formed by thermocompression bonding on the surface of the intermediate plastic substrate.

[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 perfluoroalkoxy alkane film, and a tetrafluoroethylene-hexafluoropropylene copolymer film.

[0014] Preferably, each of the fireproof reinforcement layers has a laminated structure including a film formed by thermocompression bonding directly on the surface of the intermediate plastic substrate and a coating layer formed by coating on the surface of the film away from the intermediate plastic substrate. The film is a fluorine-containing polymer film, and the coating layer is formed of an organic paint containing an amino resin or an inorganic paint containing a silicate.

Advantages of the Invention

[0015] As an advantageous effect of the present invention, the transparent fireproof plastic sheet according to the present invention has the technical features that "the transparent fireproof plastic sheet meets the requirements of flammability grade level 2 according to CNS 14705-1", "the intermediate plastic substrate has a first visible light transmittance of 80% or more and a flammability grade of V0 according to the UL94 combustion test with a thickness from 0.8 mm to 6.4 mm", and "each of the two fireproof 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 protection layer after being subjected to high temperature". Therefore, the transparent fireproof plastic sheet has high transparency and high fireproof performance, and can be more widely applied (specifically, fireproof building materials, partition panels, ceilings, etc.). For example, partition panels or ceilings of the hot aisle and cold aisle containment systems in data centers (server rooms) can be mentioned.

Brief Description of the Drawings

[0016]

Figure 1

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Embodiments for Carrying Out the Invention

[0017] For a better understanding of the features and technical content of the present invention, please refer to the following detailed description of the present invention and the accompanying drawings. However, the provided accompanying drawings are for reference and explanation only and are not intended to limit the scope of the claims of the present invention.

[0018] Hereinafter, embodiments of the "transparent fireproof plastic sheet" according to the present invention will be described according to specific embodiments, and those skilled in the art can understand the advantages and effects of the present invention based on the content disclosed in this specification.

[0019] Also, as described beforehand, the attached drawings of the present invention are simple schematic illustrations and are not drawn based on actual sizes. The present invention can be implemented or applied by other different specific embodiments, and for each detail in this specification, various modifications and changes can be made based on different perspectives and uses without departing from the concept of the present invention. The technical content of the present invention will be described in more detail based on the following embodiments, but the disclosed content does not limit the protection scope of the present invention.

[0020] It should be understood that in this specification, terms such as "first", "second", "third", etc. may be used to describe various materials or parameters, but these materials or parameters are not limited by these terms. These terms are mainly used to distinguish one material from another material, or one parameter from another parameter.

[0021] Also, the term "or" used in this specification may, depending on the actual situation, include any one or a combination of multiple items listed in relation to each other.

[0022] [First Embodiment] As shown in FIGS. 1 and 2, the first embodiment of the present invention provides a transparent fireproof plastic sheet 100A.

[0023] Here, FIG. 1 is a schematic diagram showing the laminated structure of the transparent fireproof plastic sheet 100A according to the first embodiment of the present invention before receiving high temperature. FIG. 2 is a schematic diagram showing the laminated structure in which a carbon protection layer 2a is formed after the transparent fireproof plastic sheet 100A according to the first embodiment of the present invention receives high temperature.

[0024] As shown in FIG. 1, the transparent fireproof plastic sheet 100A includes an intermediate plastic substrate 1 and two fireproof reinforcement layers 2. The two fireproof reinforcement layers 2 are respectively formed on both sides of the intermediate plastic substrate 1.

[0025] The intermediate plastic substrate 1 employs a plastic sheet having the characteristics of a specific material.

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

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

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

[0029] In one embodiment of the present invention, the plastic material in 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] Here, 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-described visible light transmittance and UL94 flame retardancy, it is the object to be protected by the present invention and is included in the scope of claims of the present invention.

[0033] It should be noted 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 thereto.

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

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

[0036] More specifically, as shown in FIG. 2, each of the fireproof reinforcement layers 2 can be formed as a carbon protective layer 2a when exposed to high temperatures (e.g., high temperatures in the range of 150°C to 1500°C) in an atmospheric environment. 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 fireproof reinforcement layer 2 before it is heated at high temperatures. By slowing down the heat transfer rate to the central plastic substrate 1 in this way, the flammability of the surface of the plastic plate 100A is reduced. In the present embodiment, the carbon protective layer 2a has a foamed structure and a third thickness T3. The third thickness T3 is 5 to 30 times, preferably 10 to 30 times, the second thickness T2 (i.e., the thickness of the fireproof reinforcement layer 2 before it is heated at high temperatures).

[0037] In other words, the fireproof reinforcement layer 2 expands due to high-temperature heating and is formed as a carbon protective layer 2a (carbon foam heat insulating material) having a foamed structure, thereby providing a heat insulating effect to the intermediate plastic substrate 1.

[0038] In addition, the carbon protective layer 2a formed by high-temperature heating has a third visible light transmittance that is 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 obtained, for example, by measurement in accordance with "ASTM D1003 Standard Test for Haze and Light Transmittance of Transparent Plastics".

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

[0040] In one embodiment of the present invention, the organic paint contains an amino resin, and the amino resin may be at least one selected from the group consisting of aniline, dicyandiamide, melamamine, 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] The material can react with carbon dioxide in the air after being subjected to high temperature to form a carbon protection layer 2a having a foamed structure. Incidentally, in one embodiment of the present invention, a carbon-forming substance may be further added to the fireproof reinforcing layer 2. Examples of the carbon-forming substance include carbon-rich polyhydroxy compounds and organic resins having a hydroxyl group, but the present invention is not limited thereto.

[0043] Furthermore, through the laminated design of the intermediate plastic substrate 1 and the two fireproof reinforcing layers 2, the transparent fireproof plastic sheet 100A according to the embodiment of the present invention meets the level 2 flame retardancy grade according to CNS 14705-1.

[0044] Here, CNS 14705-1 is the "Test Method for Heat Release Rate of Building Materials in Combustion".

[0045] The visible light transmittance of the transparent fireproof plastic sheet 100A according to the embodiment of the present invention achieves 80% or more and can be applied to fireproof building materials, partition panels, ceilings, etc. For example, partition panels or ceilings of the hot aisle and cold aisle containment systems in data centers (server rooms) can be mentioned.

[0046] It should be noted that the transparent fireproof plastic sheet 100A according to the embodiment of the present invention has better flame retardancy due to the design of the laminated structure of the intermediate plastic substrate 1 and the two fireproof reinforcement layers 2.

[0047] If the fireproof reinforcement layers 2 are not formed on both sides of the intermediate plastic substrate 1, it cannot meet the standards of CNS 14705-1.

[0048] [Second Embodiment] As shown in FIGS. 3 and 4, the second embodiment of the present invention provides a transparent fireproof plastic sheet 100B.

[0049] Here, FIG. 3 is a schematic diagram showing the laminated structure of the transparent fireproof plastic sheet 100B according to the second embodiment of the present invention before receiving high temperature. FIG. 4 is a schematic diagram showing the laminated structure in which the carbon protection layer 2a' is formed after the transparent fireproof plastic sheet 100B according to the second embodiment of the present invention receives high temperature.

[0050] As shown in FIG. 3, the transparent fireproof plastic sheet 100B includes an intermediate plastic substrate 1 and two fireproof reinforcement layers 2'. The two fireproof reinforcement layers 2' are respectively formed on both sides of the intermediate plastic substrate 1.

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

[0052] The intermediate plastic substrate 1 with a thickness ranging from 0.8 mm to 6.4 mm passes the UL94 combustion test with a flame retardancy grade of V0.

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

[0054] The features of other materials in the intermediate plastic substrate 1 are similar to those in the first embodiment, and thus will not be described redundantly here.

[0055] Furthermore, as shown in FIG. 3, each of the fireproof reinforcement layers 2' is a transparent fireproof film formed on the surface of the intermediate plastic substrate 1 by thermocompression bonding. Here, the thermocompression bonding temperature for thermocompression bonding the transparent fireproof film to the surface of the intermediate plastic substrate 1 is 190°C to 400°C.

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

[0057] Furthermore, as shown in FIG. 4, even if each of the fireproof reinforcement layers 2' is subjected to a high temperature (for example, a high temperature of 350°C to 1000°C) in an air atmosphere, spontaneous ignition does not occur, and a carbon protection layer 2a' can be formed. The carbon protection layer 2a' covers the surface of the intermediate plastic substrate 1, and the thermal conductivity of the carbon protection layer 2a' is lower than the thermal conductivity of the fireproof reinforcement layer 2' before the fireproof reinforcement layer 2' is subjected to a high temperature. Thereby, by reducing the heat transfer rate to the central plastic substrate 1, the flammability of the surface of the plastic plate 100B is reduced.

[0058] In this embodiment, the carbon protection layer 2a' formed after being subjected to a high temperature has a slightly expanded thickness (for example, an expansion of 50% or more) and has high flame retardancy.

[0059] Furthermore, as shown in FIG. 3, the transparent fireproof film of the fireproof reinforcement 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 polyvinyl fluoride (PVF) film, polyvinylidene difluoride (PVDF) film, perfluoroalkoxy alkane (PFA) film, and tetrafluoroethylene-hexafluoropropylene copolymer (FEP) film.

[0060] Further explaining, due to the laminated design of the intermediate plastic substrate 1 and the two fireproof reinforcement layers 2', the transparent fireproof plastic sheet 100B according to the embodiment of the present invention meets the flammability grade of level 2 according to CNS 14705-1.

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

[0062] Here, FIG. 5 is a schematic diagram showing the laminated structure of the transparent fireproof plastic sheet 100C according to the third embodiment of the present invention before receiving high temperature. FIG. 6 is a schematic diagram showing the laminated structure in which a carbon protection layer is formed after the transparent fireproof plastic sheet 100C according to the third embodiment of the present invention receives high temperature.

[0063] As shown in FIG. 5, the transparent fireproof plastic sheet 100C includes an intermediate plastic substrate 1 and two fireproof reinforcement layers. The two fireproof reinforcement layers are respectively formed on both sides of the intermediate plastic substrate 1.

[0064] The difference between this embodiment and the above embodiment is that each of the fireproof reinforcement layers has a laminated structure including a first fireproof reinforcement layer 2' and a second fireproof reinforcement layer 2.

[0065] Here, the first fireproof reinforcement 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] In addition, the second fireproof reinforcement layer 2 is the transparent fireproof reinforcement coating layer according to the first embodiment, and is directly formed on the surface of the first fireproof reinforcement layer 2' (that is, the transparent fireproof film) away from the intermediate plastic substrate 1 by coating.

[0067] Furthermore, as shown in FIG. 6, after each of the fireproof reinforcement layers (including 2 and 2') is subjected to high temperature (for example, high temperature of 150°C to 1500°C) in an air atmosphere, carbon protective layers 2a, 2a' can be formed. The carbon protective layers 2a, 2a' cover the surface of the intermediate plastic substrate 1 and reduce the flammability of the surface of the plastic plate 100C by slowing down the heat transfer rate to the central plastic substrate 1.

[0068] Furthermore, due to the laminated design of the intermediate plastic substrate 1, the fireproof reinforcement layer 2, and the fireproof reinforcement layer 2', the transparent fireproof plastic sheet 100C according to the embodiment of the present invention meets the flammability resistance grade of level 2 according to CNS 14705-1.

[0069] [Advantageous Effects According to Embodiments] As an advantageous effect of the present invention, the transparent fireproof plastic sheet according to the present invention has the following technical features: "meeting the requirements of Flame Retardant Grade 2 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 combustion test with a thickness ranging from 0.8 mm to 6.4 mm", and "each of the two fireproof strengthening layers formed on both sides of the intermediate plastic substrate has a second visible light transmittance of 80% or more and forms a carbon protection layer after being subjected to high temperature". Due to these features, the transparent fireproof plastic sheet has high transparency and fireproof performance, and thus can be more widely applied (specifically, in fireproof building materials, partition panels, ceilings, etc.). For example, it can be used in partition panels or ceilings of the hot aisle and cold aisle containment systems in data centers (server rooms).

[0070] The content disclosed above is only a preferred feasible embodiment of the present invention, and the scope of the claims of the present invention is not limited thereto. Therefore, all equivalent technical changes made using the content of the specification and drawings of the present invention are included in the scope of the claims of the present invention.

Explanation of Reference Numerals

[0071] 100A, 100B, 100C... Transparent fireproof plastic sheet 1... Intermediate plastic substrate 2, 2’... Fireproof strengthening layer, First fireproof strengthening layer, Second fireproof strengthening layer 2a, 2a’... Carbon protection layer T1... First thickness T2... Second thickness T3... Third thickness

Claims

1. A transparent fireproof plastic sheet that meets the requirements of level 2 of the flame retardant grade according to CNS 14705-1, wherein the transparent fireproof plastic sheet comprises an intermediate plastic substrate and two fireproof reinforcement layers respectively formed on both surfaces of the intermediate plastic substrate, the intermediate plastic substrate has a first visible light transmittance of 80% or more, and the flame retardant grade by the UL94 combustion test for a thickness from 0.8 mm to 6.4 mm is V0, each of the fireproof reinforcement layers has a second visible light transmittance of 80% or more, and is formed as a carbon protection layer after being subjected to high temperature, characterized in that it is a transparent fireproof plastic sheet.

2. The transparent fireproof plastic sheet according to claim 1, wherein the thermal conductivity of the carbon protection layer is lower than the thermal conductivity before the high temperature heating of the fireproof reinforcement layer so as to reduce the rate of heat transfer to the intermediate plastic substrate.

3. The transparent fireproof plastic sheet according to claim 1, wherein the intermediate plastic substrate has a flame retardant grade of V0 by the UL94 combustion test for a thickness from 1.2 mm to 3.2 mm.

4. 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, the transparent fireproof plastic sheet according to claim 1.

5. The first thickness of the intermediate plastic substrate is 1.0 mm to 30 mm, each of the fireproof reinforcement layers has a second thickness, and the second thickness is 0.0005 times to 0.25 times the first thickness, the transparent fireproof plastic sheet according to claim 1.

6. The transparent fireproof plastic sheet according to claim 5, wherein each of the fireproof reinforcement layers is a coating layer formed by coating on the surface of the intermediate plastic substrate.

7. The carbon protection layer is formed by the coating layer, has a foamed structure, and the carbon protection layer has a third thickness, and the third thickness is 5 times to 30 times the second thickness, the transparent fireproof plastic sheet according to claim 6.

8. The coating layer is formed of an organic paint or an inorganic paint, The organic paint contains an amino resin, and the amino resin is at least one selected from the group consisting of aniline, dicyandiamide, melamine, diammonium phosphate, and ammonium polyphosphate. The inorganic paint contains a silicate, and the silicate is at least one selected from the group consisting of sodium silicate, potassium silicate, and calcium silicate. The transparent fireproof plastic sheet according to claim 6.

9. Each of the fireproof reinforcing layers is a film formed by thermocompression bonding on the surface of the intermediate plastic substrate, 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. The transparent fireproof plastic sheet according to claim 1.

10. Each of the fireproof reinforcing layers has a laminated structure including a film formed by thermocompression bonding directly on the surface of the intermediate plastic substrate and a coating layer formed by coating on the surface of the film away from the intermediate plastic substrate. The film is a fluorine-containing polymer film, and the coating layer is formed of an organic paint containing an amino resin or an inorganic paint containing a silicate. The transparent fireproof plastic sheet according to claim 1.

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