Heat-resistant coatings, heat-resistant fabrics, and heat-resistant products

Abstract

To provide a heat-resistant coating material, a heat-resistant fabric, and a heat-resistant product which are capable of exhibiting heat resistance, fire retardancy, and adhesion prevention property, without damaging flexibility of a fabric, even when formed on a surface of a fabric.SOLUTION: A heat-resistant coating material 2 is a coating material coated on a surface of a fabric 3, and is a dry material coated with a slurry containing silicone as a main component and containing a metal hydroxide, wherein, relative to a total solid mass of the slurry, 50 mass% to 70 mass% of silicone, 20 mass% to 40 mass% of the metal hydroxide, and 0.5 mass% to 3 mass% of silica particles are contained respectively, and colored with a pigment to a color other than white.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a heat-resistant coating material used for heat-resistant products used in an environment where high-temperature flying objects such as molten metal fly in the metal manufacturing industry, etc., a heat-resistant fabric provided with this heat-resistant coating material, and a heat-resistant product.

Background Art

[0002] In front of the furnace work, welding work, etc. in an electric furnace or refining furnace for melting or refining metal materials often involves the scattering of high-temperature flying objects such as molten metal, spatter, and sparks (hereinafter, simply referred to as molten metal, etc.). In order to protect workers from such a harsh environment, heat-resistant clothing is generally used. Heat-resistant clothing is required to have heat resistance, flame retardancy, etc.

[0003] Conventionally, as a material for heat-resistant clothing, a fabric made of 100% cotton fiber has been used. Heat-resistant clothing made of a fabric of 100% cotton fiber burns less easily than general synthetic resin fibers (such as polyester fibers) and has a good texture, so it is widely distributed. In addition, as other materials, aramid fibers, polyimide fibers, etc. have also been proposed as materials with high heat resistance and flame retardancy (see, for example, Patent Document 1). However, in the case of fabrics made of cotton fibers or synthetic resin fibers, there is a concern that molten metal, etc. adheres to the surface and penetrates from the folds where the fibers are intertwined, resulting in molten holes, etc.

[0004] As a countermeasure against this, it is known to coat the surface of the fabric with a coating material such as resin. For example, Patent Document 2 proposes a fabric for protective clothing in which a fabric made of aramid fibers is coated with a predetermined fluorine-containing resin. This fabric has spatter resistance against molten metal, etc. in addition to heat resistance, etc. due to the predetermined fluorine-containing resin.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

[0006] As described in Patent Document 2 above, coating the surface of a fabric with resin or the like can prevent the adhesion of molten metals and the like. On the other hand, such fabrics are prone to losing their flexibility due to the formation of a coating on their surface. Therefore, processing such as folding or sewing may cause the coating to tear or fall off, making it difficult to achieve the desired effect of the coating. In addition, the reduced flexibility of the fabric may restrict the worker's movement when wearing it, potentially affecting work efficiency.

[0007] This invention was made to address these circumstances and aims to provide a heat-resistant coating material, a heat-resistant fabric, and a heat-resistant product that can exhibit heat resistance, flame retardancy, and anti-adhesion properties without impairing the flexibility of the fabric, even when formed on the surface of a woven fabric. [Means for solving the problem]

[0008] The heat-resistant coating material of the present invention is a heat-resistant coating material applied to the surface of a fabric, and is characterized by being a coating and drying material that contains silicone as the main component and a slurry containing metal hydroxide.

[0009] The slurry is characterized in that, relative to the total solid mass, the silicone is present in an amount of 50% to 70% by mass, and the metal hydroxide is present in an amount of 20% to 40% by mass.

[0010] The above heat-resistant coating material contains silica particles, and the silica particle content is characterized by being 0.5% to 3% by mass relative to the total solid mass of the slurry. Furthermore, the above heat-resistant coating material contains a pigment, and is colored with a color other than white by the pigment.

[0011] The above-mentioned silicone is characterized by containing silicone rubber and silicone oil.

[0012] The heat-resistant fabric of the present invention is a heat-resistant fabric comprising a woven fabric and a covering material covering its surface, wherein the covering material is the heat-resistant covering material of the present invention.

[0013] The heat-resistant product of the present invention is characterized in that it is sewn using the heat-resistant fabric of the present invention, the heat-resistant covering material is the outer fabric, and the woven fabric is the lining. [Effects of the Invention]

[0014] The heat-resistant coating material of the present invention is a coating and drying material that contains silicone as the main component and a slurry containing metal hydroxide. Therefore, even when applied to the surface of a fabric, it can exhibit heat resistance, flame retardancy, and anti-adhesion properties without impairing the flexibility of the fabric. In particular, by containing metal hydroxide, it repels water at the moment of contact with molten metal, etc., and prevents the adhesion of molten metal, etc., by forming a gap at the interface with the molten metal, etc. In the present invention, a heat-resistant coating material refers to a coating material that has the property of preventing large holes from forming or combustion even when high-temperature flying materials such as molten metal fall on it. This heat-resistant coating material is used, for example, in environments where high-temperature flying materials are scattered, such as near electric furnaces and refining furnaces, and in welding workshops.

[0015] Furthermore, since the slurry contains 50% to 70% by mass of silicone and 20% to 40% by mass of metal hydroxide relative to the total solid mass, it excels at ensuring flexibility in the fabric while simultaneously providing flame retardancy and anti-adhesion properties.

[0016] The heat-resistant coating material contains silica particles, and the content of the silica particles is 0.5% to 3% by mass based on the total solid mass of the slurry. Therefore, the strength of the coating material can be improved by particle dispersion strengthening, and the adhesion to the base fabric can be enhanced.

[0017] The heat-resistant coating material contains silicone and metal hydroxide as main raw materials, and the base color of these raw materials is white. As one form, the heat-resistant coating material is colored with a pigment to a color other than white, so it becomes easier to identify the location where molten metal or the like adheres. As a result, it becomes easier to take measures such as repair for the location, leading to further improvement in workability and safety.

[0018] Since the heat-resistant fabric of the present invention includes a fabric and the heat-resistant coating material of the present invention coated on the surface thereof, even when coated on the surface of the fabric, it can exhibit heat resistance, flame retardancy, and adhesion prevention properties without impairing the flexibility of the fabric. Thereby, it can be widely used as a fabric for heat-resistant applications and protective applications.

[0019] The heat-resistant product of the present invention is sewn with the heat-resistant fabric of the present invention, the heat-resistant coating material is the outer fabric, and the fabric is the inner fabric. Therefore, it can exhibit heat resistance, flame retardancy, and adhesion prevention properties without impairing the comfort and stretchability.

Brief Description of the Drawings

[0020] [Figure 1] It is a view showing an example of the heat-resistant fabric of the present invention.

Embodiments for Carrying Out the Invention

[0021] The heat-resistant coating material of the present invention is used, for example, in heat-resistant products (such as heat-resistant clothing) that protect workers and objects from high-temperature flying objects generated in iron-making blast furnace factories, aluminum electrolysis and casting factories, welding factories, etc., and is formed on the side that comes into contact with high-temperature flying objects. The heat-resistant coating material of the present invention contains silicone as a main component and also contains metal hydroxide to further improve flame retardancy and adhesion prevention properties.

[0022] This allows the fabric to exhibit heat resistance, flame retardancy, and anti-adhesion properties, while also ensuring the fabric's flexibility even when coated on its surface, resulting in excellent processability for clothing and equipment. Therefore, the coating material can be fully utilized, and the fabric itself has superior durability. For example, heat-resistant clothing made with this fabric can be made thinner than conventional 100% cotton heat-resistant clothing, improving comfort and stretchability, and also contributing to reducing the burden on workers.

[0023] An example of a heat-resistant fabric equipped with the heat-resistant coating material of the present invention will be described with reference to Figure 1. As shown in Figure 1, the fabric 1 has a coating material 2 formed on the surface of a cloth 3. The coating material 2 is formed by adhering a predetermined slurry to the cloth 3 by spraying, brushing, or dipping, and then drying a dispersion medium such as water or alcohol. In this case, either natural drying or forced drying may be used. This fabric 1 can be appropriately processed into heat-resistant products used in environments where high-temperature flying materials are scattered, such as heat-resistant clothing.

[0024] Coating material 2 is a coating and drying material made of a slurry mainly composed of silicone and containing metal hydroxides. Furthermore, "slurry-based coating and drying material" refers to a component obtained by coating a fabric with the above slurry and drying it.

[0025] The following describes in detail the components of the covering material 2 in fabric 1.

[0026] <Silicone> Silicone is the main component of the coating material and is a component that imparts heat resistance, flame retardancy, flexibility, and other properties to the coating material. In the present invention, the silicone only needs to be capable of forming an organopolysiloxane coating layer, and there are no particular restrictions on its molecular structure, the type of organic group bonded to the silicon atom, the type of group or atom other than the organic group bonded to the silicon atom, or the degree of polymerization of the siloxane.

[0027] In the present invention, silicone is a concept that includes silicone rubber, silicone oil, and silicone resin, and these may be used individually or in combination of two or more types.

[0028] Examples of silicone rubbers include diorganopolysiloxanes in which both ends of the molecular chain are sealed with hydroxyl groups, mixtures of this hydroxyl-containing diorganopolysiloxane and alkoxysilane or its partially hydrolyzed condensate, and mixtures of diorganopolysiloxanes having two or more alkenyl groups, such as vinyl groups, bonded to silicon atoms in the molecular chain ends or main chain, and organohydrogenpolysiloxanes, which are cured in the presence of a curing agent or moisture. Examples of curing agents include organic peroxides, metal salts of organic acids, platinum compounds, and tin compounds.

[0029] As silicone rubber, room-temperature curing silicone rubber (RTV silicone rubber) that hardens at room temperature, heat-curing silicone rubber that hardens by heating, and ultraviolet / electron beam curing silicone rubber that hardens by irradiation with ultraviolet light or electron beams can be used. From the viewpoint of ease of handling during curing, it is preferable to use RTV silicone rubber. RTV silicone rubber can be in liquid, gel, or putty form before curing, and the curing reaction proceeds at room temperature to become a rubber elastic body.

[0030] RTV silicone rubber is broadly classified into condensation reaction type and addition reaction type based on its curing mechanism, but either type can be used. Condensation reaction type silicone rubber is cured by a condensation reaction, and examples include silicone rubber with hydroxyl groups at its ends. On the other hand, addition reaction type silicone rubber is cured by an addition reaction, and examples include silicone rubber with hydrogen or vinyl groups as side chains.

[0031] As RTV silicone rubber, for example, one-component RTV silicone rubber and two-component RTV silicone rubber can be used. The one-component type can be used simply by squeezing it out of a container such as a tube, while the two-component type is used by mixing two components, a main component and a curing agent. From the viewpoint of uniform dispersion of the slurry, it is preferable to use the two-component type.

[0032] The viscosity of the RTV silicone rubber before curing is not particularly limited, but for example, at 23°C it is 10 Pa·s to 200 Pa·s, preferably 10 Pa·s to 100 Pa·s, and more preferably 10 Pa·s to 50 Pa·s. If the viscosity of the RTV silicone rubber is below 10 Pa·s, the RTV silicone rubber is prone to sagging, which may reduce its operability. On the other hand, if the viscosity of the RTV silicone rubber is above 200 Pa·s, it may become difficult to homogenize the slurry.

[0033] Specific examples of RTV silicone rubbers that can be used include those listed below. Examples of one-component condensation reaction type RTV silicone rubbers include KE-3423, KE-3495, and KE-4895 manufactured by Shin-Etsu Chemical Co., Ltd. Examples of two-component condensation reaction type RTV silicone rubbers include KE-12, KE-14, KE-17, and KE-1414 manufactured by Shin-Etsu Chemical Co., Ltd. Examples of one-component addition reaction type RTV silicone rubbers include KE-1830, KE-1884, KE-1820, and KE-1831 manufactured by Shin-Etsu Chemical Co., Ltd. Examples of two-component addition reaction type RTV silicone rubbers include KE-103, KE-1300T, KE-1310ST, and KE-1600 manufactured by Shin-Etsu Chemical Co., Ltd.

[0034] As silicone oils, straight silicone oils such as dimethyl silicone oil, methylphenyl silicone oil, and methylhydrogen silicone oil, as well as modified silicone oils in which various organic groups have been introduced to some of the methyl groups, can be used.

[0035] Modified silicone oils include amino-modified silicone oil, epoxy-modified silicone oil, carbinol-modified silicone oil, mercapto-modified silicone oil, carboxyl-modified silicone oil, polyether-modified silicone oil, methacrylic-modified silicone oil, methylstyryl-modified silicone oil, long-chain alkyl-modified silicone oil, and higher fatty acid ester-modified silicone oil. Modified silicone oils are broadly classified into side-chain type, in which an organic group is introduced to part of the polysiloxane side chain; double-ended type, in which an organic group is introduced to both ends of the polysiloxane; single-ended type, in which an organic group is introduced to one end of the polysiloxane; and side-chain double-ended type, in which an organic group is introduced to part of the polysiloxane side chain and both ends. Any of these may be used.

[0036] The kinematic viscosity of silicone oil is, for example, 1 mm at 25°C. 2 / s~10000mm 2 / s is 10mm 2 / s~1000mm 2 / s is also acceptable, and 10mm 2 / s~500mm 2 The viscosity may also be expressed as / s. The viscosity is measured using a rotational viscometer.

[0037] Silicone resins are organopolysiloxanes with a three-dimensional structure, also known as silicone varnishes. Their average composition formula is RaSiO2. (4-a) / 2 This includes various silicone resins represented by the formula (wherein R is an organic group and a is a number between 1.0 and 1.8). For example, the organic group R can be an alkyl group such as a methyl group, ethyl group, or propyl group; an aryl group such as a phenyl group; an alkenyl group such as a vinyl group or allyl group; or a group in which some of the carbon atoms of these hydrocarbon groups are substituted with halogen atoms, cyano groups, etc. Such silicone resins may also be modified silicone resins that have been modified with epoxy, melamine, polyester, etc.

[0038] In the present invention, the silicone preferably contains silicone rubber, and more preferably contains both silicone rubber and silicone oil. Silicone oil is generally used as a silicone-based water repellent, and it is believed that incorporating silicone oil can reduce the surface tension of the coating material and contribute to improving its ability to prevent adhesion to molten metals, etc. In this case, the content of silicone oil is preferably 20 to 150 parts by mass per 100 parts by mass of silicone rubber, more preferably 20 to 80 parts by mass per 100 parts by mass of silicone rubber, and even more preferably 50 to 80 parts by mass per 100 parts by mass of silicone rubber. Note that the content of the silicone rubber mentioned above does not include the content of the curing agent.

[0039] <Metal hydroxide> Metal hydroxides are primarily used to impart flame retardancy and anti-adhesion properties to coating materials. Examples of metal hydroxides include magnesium hydroxide, calcium hydroxide, aluminum hydroxide, and barium hydroxide. Metal hydroxides may be used individually or in combination of two or more types. These metal hydroxides undergo an endothermic dehydration reaction under high temperatures, releasing water molecules and absorbing heat to lower the temperature. They also repel water at the moment of contact with molten metals, forming a gap at the interface with the molten metals, thereby preventing adhesion. In other words, they create a boundary at the interface with the molten metals, allowing them to fall and be repelled, or making it easier to deal with them.

[0040] In the field of metal refining, paper tubes have been widely used as protective insulation materials for measuring melting temperatures, from the time when demand first began to increase until the present day. Although it is generally understood that paper tubes are used only below the point of burning, the insulation mechanism of paper tubes is complex, and they are used in a temperature range nearly four times the ignition point of the defined fixed point of paper. This is because paper tubes immersed in molten metal do not burn, but are reduced and catabolized by carbon and water at the molten metal interface, and the Leidenfrost effect caused by the generation of water creates a gap at the interface with the molten metal, thus blocking intense heat. In this invention, by using a metal hydroxide (hydrated metal), the Leidenfrost effect can be similarly achieved, and the ability to prevent the adhesion of scattered molten metal, etc., can be improved.

[0041] Among metal hydroxides, it is preferable to use at least one selected from magnesium hydroxide and aluminum hydroxide, and more preferably aluminum hydroxide. Aluminum hydroxide is a powder represented by the chemical formula Al(OH)3 or Al2O3·3H2O. Aluminum hydroxide can release water molecules from relatively low temperatures. Furthermore, after releasing water molecules, it combines with other bases and intervenes as an aluminate, acting as a refractory material without volatilization. The amount of moisture adhering to the aluminum hydroxide is preferably 0.01% by mass or more, and more preferably 0.05% by mass or more. As for commercially available aluminum hydroxide products, the product name: Hydelilite (registered trademark) manufactured by Showa Denko K.K. can be used.

[0042] For example, in the case of halloysite (hydrated aluminum silicate), which is a hydrated silicate mineral containing metal, the water-repellent temperature range is much higher than that of aluminum hydroxide. In the present invention, the water-repellent onset temperature range is considered particularly important for effectively exhibiting anti-adhesion properties. It is preferable that the heat-resistant coating material of the present invention does not contain hydrated metal silicate minerals or their calcined products. Other examples of hydrated metal silicate minerals include kaolin, talc, and sepiolite.

[0043] The average particle size of the metal hydroxide is, for example, 0.5 μm to 50 μm, but may also be 0.5 μm to 30 μm or 0.5 μm to 10 μm. This average particle size is the median diameter measured by a laser diffraction / scattering particle size distribution analyzer. If the average particle size of the metal hydroxide is in the range of 0.5 μm to 50 μm, a slurry with appropriate fluidity can be obtained.

[0044] In the heat-resistant coating material of the present invention, for example, the slurry contains 30% to 70% by mass of silicone and 20% to 60% by mass of metal hydroxide, based on the total solid mass. Preferably, the slurry contains 50% to 70% by mass of silicone and 20% to 40% by mass of metal hydroxide, based on the total solid mass. More preferably, the slurry contains 60% to 70% by mass of silicone and 30% to 40% by mass of metal hydroxide, based on the total solid mass.

[0045] From another perspective, in the heat-resistant coating material of the present invention, the total amount of silicone and metal hydroxide is preferably 90% by mass or more, and more preferably 95% by mass or more, relative to the total solid mass of the slurry. In this case, it is preferable that the silicone content is greater than the metal hydroxide content.

[0046] In addition to the silicone and metal hydroxide described above, the coating material of the present invention may also contain other components. These other components may include, for example, inorganic particles (excluding metal hydroxides; the same applies hereinafter) and pigments. The total amount of these other components (including the curing agent) is preferably 10% by mass or less, and more preferably 5% by mass or less, relative to the total solid mass of the slurry.

[0047] <Inorganic particles> Examples of inorganic particles include silica particles, metal particles, and metal oxide particles. Examples of metals for metal particles include iron, titanium, nickel, chromium, aluminum, zinc, copper, and alloys containing these metals. Examples of metal oxides for metal oxide particles include oxides of the above metals, such as iron oxide (Fe2O3), titanium oxide (TiO2), aluminum oxide (Al2O3), and zinc oxide (ZnO). These inorganic particles may be used individually or in combination of two or more types.

[0048] The average particle size of the inorganic particles (50% average particle size by laser method) is not particularly limited, but is, for example, 0.01 μm to 100 μm, and preferably 0.01 μm to 1 μm. The inorganic particle content is also not particularly limited, but is preferably 0.3% to 3% by mass, and more preferably 0.3% to 2% by mass, relative to the total solid mass of the slurry.

[0049] Among the inorganic particles mentioned above, silica particles are preferred. For example, fumed silica can be used as silica particles. This silica is obtained by calcining silicon chloride, a raw material, at high temperatures. An example of such silica is amorphous isolated silica obtained by vaporizing silicon tetrachloride and synthesizing it by a gas-phase reaction in a hydrogen flame at an ultra-high temperature (1000°C or higher). Fumed silica has hydrophilic silanol groups (Si-OH) on its surface. Furthermore, it does not migrate to the liquid phase during manufacturing and is a loose aggregate, thus exhibiting excellent dispersibility in water. While hydrophobic silica nanoparticles obtained by chemically reacting the silanols on the surface of fumed silica exist, it is more preferable to use hydrophilic silica nanoparticles (non-hydrophobic silica nanoparticles) whose surface silanol groups have not been modified.

[0050] The average particle size of primary particles in fumed silica (50% average particle size measured by laser method) is not particularly limited, but is, for example, 10 nm to 40 nm.

[0051] The inclusion of silica particles in the coating material improves its strength through particle dispersion and strengthens its adhesion to fabrics, and also helps prevent slurry dripping during coating formation.

[0052] <Pigments> The heat-resistant coating material of the present invention can be colored by incorporating a pigment. Generally, organic pigments and inorganic pigments usable for coloring inks, chalks, or paints can be used as pigments. Examples of organic pigments include polycyclic pigments such as phthalocyanine pigments and azo pigments. Examples of inorganic pigments include calcium carbonate, magnesium carbonate, barium carbonate, talc, kaolin, barium sulfate, aluminum oxide, iron oxide, chromium oxide, ultramarine, and carbon black. These pigments may be used individually or in combination of two or more.

[0053] Since the base color of silicone and metal hydroxide, the main raw materials of heat-resistant coatings, is white, it is preferable to use pigments that can color the coating in colors other than white. By coloring the coating in colors other than white, for example, if molten metal adheres to the heat-resistant coating, the affected area will change color to, for example, white, making it easier to identify the area where the molten metal has adhered. This allows for repairs and other countermeasures, leading to improved safety.

[0054] The pigment content is not particularly limited, but is preferably 1% to 5% by mass, and more preferably 1% to 3% by mass, relative to the total solid mass of the slurry.

[0055] In addition to the inorganic particles and pigments mentioned above, the heat-resistant coating material of the present invention may also contain other components such as aluminum phosphate; polyolefin resin fibers such as polypropylene resin; synthetic resin fibers such as polyamide fibers; clay minerals such as attapulgite, bentonite, and montmorillonite; and inorganic fibers such as glass fibers, ceramic fibers, and carbon fibers.

[0056] The fabric used in the heat-resistant fabric of the present invention may be in the form of woven fabric, knitted fabric, nonwoven fabric, felt, etc. From the viewpoint of easily improving adhesion to the heat-resistant coating material and mechanical properties, fabrics made of continuous fibers such as woven fabrics and knitted fabrics are preferred. Examples of woven fabrics include plain weave, twill weave, satin weave, etc. Examples of knitted fabrics include weft knitted fabrics and warp knitted fabrics.

[0057] Examples of fiber materials that make up the fabric include synthetic resin fibers such as aramid fibers, polyimide fibers, polyamide-imide fibers, polyetherimide fibers, acrylic fibers, polyester fibers, polyester fibers, polyamide fibers, and rayon fibers, as well as natural fibers such as cotton and linen. These fibers may be used individually or in combination of two or more types. For example, when using two or more types in combination, the two or more fibers can be mixed by conventional methods to form a blended yarn, and then the fabric can be formed using that blended yarn. For example, in the case of using cotton fibers as the fiber material, cotton fibers may constitute 50% or more of the fabric weight, or 80% or more of the fabric weight may constitute cotton fibers.

[0058] The weight of the fabric is not particularly limited, but for example, 100-500 g / m 2 This can be achieved. By setting the range within this range, it becomes easier to achieve both strength and flexibility in the fabric.

[0059] The thickness of the fabric is not particularly limited, but from the viewpoint of reducing weight and cost, 0.2 mm to 2 mm is preferred, and 0.2 mm to 1 mm is more preferred. Furthermore, it is preferable that the thickness of the fabric is greater than the thickness of the heat-resistant coating material (e.g., 0.1 mm to 0.5 mm).

[0060] The heat-resistant fabric of the present invention, by having the heat-resistant coating material described above, can reduce the overall thickness of the fabric. For example, it is possible to make the overall thickness of the fabric thinner compared to when the heat-resistant fabric is made of 100% cotton fibers. For example, the overall thickness of the fabric can be 0.3 mm to 3 mm.

[0061] The heat-resistant product of the present invention is made using the above-mentioned heat-resistant fabric. The form of the heat-resistant product is not particularly limited and can be used to protect workers, objects, etc. from high-temperature flying materials such as molten metal. For example, it can be used in various forms such as full-body protective clothing, jackets, trousers, vests, aprons, capes, hats, hoods, gloves, sheets, covers, etc. These heat-resistant products are sewn so, for example, that the heat-resistant covering material of the heat-resistant fabric becomes the outer layer and the woven fabric becomes the lining. [Examples]

[0062] Test Example 1 A fabric was prepared in which a predetermined coating material was directly formed on the surface of a plain weave fabric made of 100% cotton fibers. Silicone rubber (40% by mass), silicone oil (20% by mass), aluminum hydroxide (35% by mass), silica particles (1% by mass), and pigment (3% by mass) were stirred and mixed, and then a curing agent (1% by mass) was added and stirred and mixed further to obtain a slurry. An organic solvent was used as the dispersion medium. The mass percentages in parentheses for each additive indicate the proportion of each additive relative to the total solid mass of the slurry. The slurry was applied to one side of the fabric with a spray gun, and then allowed to harden at room temperature to form the coating material.

[0063] The resulting fabric exhibited moderate flexibility, showing no tearing of the covering material even when strongly folded. It was also easy to sew, and the covering material did not detach after sewing, demonstrating excellent adhesion to fabrics. Furthermore, even when molten metal was applied to the surface (covering material) of the fabric, it did not penetrate, indicating excellent heat resistance.

[0064] Generally, fabrics made of cotton fibers or synthetic resin fibers are at risk of instantly volatilizing when they come into contact with high-temperature molten metals. In contrast, by forming the heat-resistant coating material of the present invention on the surface of the fabric, it is possible to improve adhesion prevention by repelling water at the moment of contact with molten metals, creating a boundary at the interface with the molten metals, and causing the molten metals to fall off. This heat-resistant coating material does not change even when exposed to high temperatures such as those of molten metals, and it does not become a highly heated body itself, nor does it transmit heat inward. [Industrial applicability]

[0065] The coating material of the present invention can exhibit heat resistance, flame retardancy, and anti-adhesion properties without impairing the flexibility of the fabric, even when formed on the surface of a cloth. Therefore, it can be widely used as a heat-resistant coating material for heat-resistant clothing and other items used to protect workers in environments where high-temperature flying materials such as molten metal are scattered, such as in the metal manufacturing industry. [Explanation of Symbols]

[0066] 1. Fabric 2 Fabric 3 Covering material

Claims

1. A heat-resistant coating material that is applied to the surface of a fabric, The aforementioned heat-resistant coating material is used in heat-resistant products used in environments where molten metal is scattered. This is a coating drying agent that contains silicone as its main component and also contains aluminum hydroxide, a metal hydroxide, as a slurry. The aforementioned silicone includes silicone rubber and silicone oil. The slurry contains 50% to 70% by mass of silicone and 30% to 40% by mass of metal hydroxide, based on the total solid mass. The heat-resistant coating material is characterized by containing a pigment and being colored with the pigment to a color other than white.

2. The heat-resistant coating material according to claim 1, characterized in that the silicone is contained in an amount of 60% to 70% by mass and the metal hydroxide in an amount of 30% to 40% by mass, based on the total solid mass of the slurry.

3. The heat-resistant coating material according to claim 1 or 2, characterized in that the heat-resistant coating material contains silica particles, and the content of the silica particles is 0.5% to 3% by mass relative to the total solid mass of the slurry.

4. A heat-resistant fabric comprising a woven fabric and a covering material covering its surface, wherein the covering material is a heat-resistant covering material according to any one of claims 1 to 3.

5. A heat-resistant product characterized by being sewn with the heat-resistant fabric described in claim 4, wherein the heat-resistant covering material is the outer fabric and the woven fabric is the lining.

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