JPH0541586B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a heat-resistant elastic sheet made of unexpanded vermiculite, ceramic fibers, and a binder, which has excellent elasticity and flexibility from room temperature to high temperatures, and expands from a low temperature of about 130°C. be. Conventionally, (1) Unexamined Patent Publication No. 50-55603 contains expandable mica,
An expansible sheet material composed of an inorganic fiber material and an inorganic binder is disclosed, and (2) Japanese Patent Application Laid-Open No. 51-69507
In JP-A-54-30218, a flexible-expandable sheet material consisting of expandable mica, an inorganic fiber material, and an organic elastic binder is disclosed. A flexible expandable sheet material is shown comprising a material, an organic elastomeric binder, and an inorganic clay binder. However, according to the inventor's experiments, the sheet material of the conventional example (1) using an inorganic binder lacks flexibility and elasticity at room temperature, while the sheet material of the conventional example (2) using an organic binder lacks flexibility and elasticity at room temperature. It is known that the bonding agent in the sheet material of ) is burned out at high temperatures, resulting in a decrease in strength. Furthermore,
The inorganic binder used in the sheet material of conventional example (4), which uses a combination of organic and inorganic binders, is hardening, so at high temperatures where the organic binder is burned out, elasticity and flexibility are reduced. It was found through experiments by the inventor that this loss occurs. Furthermore, according to these conventional examples (1) to (3), the sheet-like products produced become extremely brittle at high temperatures, and furthermore, the binder content is as high as 5% or more, resulting in little expansion at low temperatures. The inventor's experiments revealed that the elasticity was low. As described above, the conventionally proposed materials have some drawbacks in properties such as heat resistance, flexibility, and elasticity, and have the disadvantage that their uses are greatly limited. An object of the present invention is to provide a sheet-like product that eliminates and improves the above-mentioned drawbacks, and achieves the above-mentioned object by providing a sheet-like product as described in the claims. The present invention will be explained in detail below. Ceramic fibers are generally made into fibers by electrically melting approximately equal amounts of high-purity silica and alumina, and then blowing the resulting stream with high-pressure air or steam. This fiber softens at 200 to 300°C. Unlike glass fiber, it does not crystallize unless the temperature reaches 850℃ or higher, and it has excellent fire resistance and can withstand high temperatures of 1000℃ or higher. However, when the above-mentioned rivulet is turned into fibers, some shots are not turned into fibers, some shots remain stuck to the tips of the fibers, and some shots break off from the tips of the fibers. The size of these shots is generally coarse if they are not made into fibers from the beginning, and many have a particle size of 150μ or more. In addition, the materials remaining at the tips of the fibers or separated from them are generally fine,
Most of the shots are about 100 to 44μ, and these make up the majority of shots. Ceramic fibers produced by the above method usually contain about 50% of the shots. Many of these shots exist in a state of being incorporated into the tangle of fibers, and it is extremely difficult to separate and remove only the shot from the tangle of fibers without destroying the fibers. Because shots are mainly spherical, they do not easily entangle with materials such as ceramic fibers or vermiculite, and they do not have expansion properties, so they do not contribute to the strength, flexibility, or elasticity of the sheet at room or high temperatures. First, in the case of the sheet-like material of the present invention, it is desirable to remove them sufficiently. Conventionally, in order to remove not only the large shots trapped in the entanglement of ceramic fibers but also the fine shots, the fibers had to be broken and fragmented, and the shot suitable for use in the sheet-like product of the present invention is It has been difficult to industrially obtain large quantities of ceramic fibers with a low content and a long fiber length. The shot removal treatment performed on the ceramic fibers used in the sheet-like product of the present invention includes a step of stirring the ceramic fibers in water to form a slurry of ceramic fiber flocs, and a step of stirring the flocs with a stirring blade and a baffle plate. The fibers are loosened in a rectangular container that can generate a gentle turbulent flow, or a cylindrical container that can generate a vortex flow by pumping pressurized water through the side wall, so that the fibers are incorporated into the tangles without breaking them. The process consists of three steps: separating the shot from the ceramic fiber by taking out the shot that is stuck to the end of the fiber and breaking off the shot stuck to the tip of the fiber, and then removing the separated shot and collecting the fiber at the same time. ,
The process is carried out by circulating the ceramic fibers in a continuous process without using any transportation device such as a liquid pump that would destroy the fibers between each process. Therefore, the ceramic fiber used in the present invention has a low shot content and a long fiber length, and a sheet-like product using the ceramic fiber has high strength and elasticity at high temperatures. Next, two examples of specific methods for obtaining ceramic fibers having a shot content of 30% or less, which are used in the sheet-like article of the present invention, will be explained. Commercially available ceramic fibers are placed in water and stirred to create a slurry of ceramic fiber flock. Next, this slurry is gradually introduced into a rectangular container equipped with stirring blades and baffles, and at the same time, water is supplied to the container and defibrated in a slow turbulent flow at a flow rate of 5 to 50 m/min. , loosen the ceramic fiber flock and separate the shot. A slurry of disentangled ceramic fibers is sequentially overflowed from the top of the container and guided onto a moving endless screen, where the shot is sieved and the fibers are collected. The shot content used in the sheet material of the present invention is
Another method for obtaining ceramic fibers of 30% or less will be described. Commercially available ceramic fibers are poured into water and stirred to create a slurry of ceramic fiber flocs.
Next, this slurry is gradually introduced into a cylindrical container, and at the same time pressurized water is pumped through the side wall of this container.
A vortex is generated, which loosens the ceramic fiber flock and separates the shot. A slurry of disentangled ceramic fibers is sequentially flowed out from the center of the eddy stream and guided onto a moving endless screen, which sieves the shots and collects the fibers. Next, a method for measuring the shot content in the ceramic fiber used in the present invention will be explained. first,
Weigh 20g of ceramic fiber and crush it for 10 seconds in a vibrating mill. Next, after weighing the total weight of this pulverized sample, it is placed in a 5-capacity beaker, decanted repeatedly, dried, and sieved, and what remains on a standard 44μ sieve is used as shot. Shot content (%) = Shot amount of 44μ or more (g)
/100(g)×100 Next, unexpanded vermiculite will be explained. Vermiculite is a particle with a flake multilayer structure, consisting of a Si-O tetrahedral layer and Mg-O(OH) or Al-
It is a hydrous mineral with a mica-like structure, which has a basic talc-like 2:1 layer structure consisting of O octahedral layers, which are connected through water between the layers. When heated, it dehydrates, peels and expands, stretching 10 to 25 times, so it has properties such as elasticity and heat insulation. However, due to the poor bonding strength between the layers, it becomes flaky with the slightest external force, making it difficult to maintain its shape by itself. The vermiculite used in the invention is advantageously treated with a sodium organic acid. This is because the expansion rate and expansion power of unexpanded vermiculite increase in proportion to the particle size, but when manufacturing sheet-like products, small particle sizes with good dispersibility are used, and the sheet-like products of the present invention It is advantageous to use particles with a particle size of 0.1 to 2.8 mm. A sheet using vermiculite with such a small particle size has low expansion force and elasticity. The present inventor has discovered that by replacing the cations between the layers of vermiculite particles with sodium organic acid, the expansion force and elasticity increase, and furthermore, vermiculite expands from a lower temperature than unsubstituted vermiculite. It was found that even if vermiculite with a small particle size is used as in the present invention, a sheet with excellent properties can be obtained if treated with sodium organic acid. The reason why the expansion power of unexpanded vermiculite is improved by immersing unexpanded vermiculite in the organic acid sodium aqueous solution is that calcium ions or magnesium ions between the layers are replaced with sodium ions. This is thought to be because water between the layers becomes difficult to escape during heating. Next, a method for treating unexpanded vermiculite used in the sheet material of the present invention with organic acid sodium will be described. A predetermined amount of unexpanded vermiculite is put into an aqueous sodium acetate solution having a concentration of 1 to 3 normal, and immersed for example for 30 minutes to 5 hours, preferably 1 hour, then washed with water and dried at 100°C. Next, the binder will be explained. Both organic and inorganic binders are used as binders, and organic binders are particularly effective, such as acrylonitrile butadiene, styrene butadiene, acrylic esters, polyurethane, vinyl acetate, and methyl cellulose, and inorganic binders include: Clay materials such as sepiolite and montmorillonite, and colloidal materials such as alumina sol and silica sol are effective. Furthermore, the present inventor has developed a method for forming a sheet by pasting an organic polymer film on one or both sides of a sheet made of each of the above-mentioned materials, or by sealing the entire surface of the sheet with an organic polymer film. It has been found that it is possible to obtain a sheet-like product that has flexibility and strength that can be handled at room temperature without impairing the product's excellent properties such as elasticity and expansibility. The above-mentioned organic polymer film may be attached or sealed to the sheet-like material using a known adhesive, or may be carried out by a shrink packing method, a vacuum packing method, or the like. However, as mentioned above, if the amount of organic polymer film used for pasting or sealing is too large, the elasticity and flexibility of the sheet material will be adversely affected. Therefore, according to experiments conducted by the present inventors, the amount of organic polymer film is desirably 0.5% or less of the weight of the sheet material to be adhered or sealed. Further, as the material for the organic polymer film, regenerated cellulose, cellulose derivatives, polyolefin, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyester, polyethylene, hydrochloric acid rubber, polyamide, fluororesin, etc. are advantageous. The present inventors have newly found that by using these materials, sheet-like products having excellent properties can be manufactured. The effects of using these materials and the properties of the sheet-like material will be explained below. The sheet material of the present invention contains ceramic fibers and unexpanded vermiculite in a content of 0.5 to 3.5% by weight.
and a very small amount of binder, and because the ceramic fibers and unexpanded vermiculite are not strongly constrained by the binder, it can be heated to 200℃.
It begins to expand at low temperatures below, and remains elastic from room temperature to high temperatures. Since it is difficult to maintain the shape of a sheet made only of ceramic fibers and unexpanded vermiculite, it is necessary to add a certain amount of binder to maintain the shape. However, there is a problem that if the amount of binder is large, the elasticity or flexibility of the sheet will be reduced, and if the amount of binder is small, it will be difficult to form a sheet-like product. The present inventor has discovered that the above problem can be solved by combining the amount of binder and the morphology of the ceramic fibers necessary for forming and maintaining the shape of the sheet without the binder impairing the properties of the sheet. . In other words, sheet materials using ceramic fibers with a shot content of 30% by weight or less have a high proportion of fibers and are highly intertwined, so even with a small amount of binder, the binding effect is fully demonstrated from room temperature to high temperature, making it excellent. It has good elasticity. Next, we will discuss the combined effects of organic and inorganic binders. Sheet materials using only an organic binder have excellent flexibility and elasticity at room temperature, but when heated, the organic binder burns out and the sheet expands too much due to the expansion of vermiculite, causing it to lose its shape. However, when an inorganic binder is used in combination, the expansion of vermiculite is moderately suppressed and the entanglement of fibers is fixed, so the shape of the sheet is sufficiently maintained, and the expansion of vermiculite is suppressed. Because of this, it exhibits elasticity not only at room temperature but also at high temperatures. The binder exhibits particularly good effects when the ratio of the inorganic binder to the organic binder is 1/2 to 1/10. If the ratio is higher than this, the sheet will be hard; if it is lower, the strength at high temperatures will be low and the elasticity will be low. As mentioned above, binder content is 0.5-3.5% by weight
The sheet material of the present invention consists of a small amount of 200
Expansion starts even at low temperatures below .degree. C., but by using unexpanded vermiculite that has been previously treated with an organic acid sodium aqueous solution, the expansion rate of the sheet material at low temperatures is improved. Furthermore, if unexpanded vermiculite with a particle size of 0.1 to 2.83 mm is used at this time, the ceramic fibers or binder and unexpanded vermiculite are uniformly mixed, so that the elasticity or strength of the sheet material is improved. Therefore, when expansion coefficient or expansion power at low temperatures is required, the sheet form of the present invention using unexpanded vermiculite with a particle size of 0-1 to 2-83 mm treated with an aqueous solution of sodium organic acid may be used. Things are advantageous. Furthermore, sodium acetate is advantageously used as the organic acid sodium used in the treatment of unexpanded vermiculite. Although the sheet-like product of the present invention made of materials such as the ceramic fiber, unexpanded vermiculite, and binder has a low binder content, there is no particular problem in normal handling at room temperature. However, if the seat is handled harshly, such as when folded, there is a risk that the surface of the seat may crack or the seat may be cut. If the sheet is to be handled harshly, it is necessary to attach an organic polymer film to one or both sides of the sheet, or to seal the sheet with an organic polymer film. At this time, it is desirable that the weight of the organic polymer film used is 0.5% by weight or less of the weight of the sheet-like material; if it is more than this, the expansion coefficient at low temperatures will decrease slightly. The sheet material of the present invention to which the organic polymer film is attached or sealed in this way not only has excellent elasticity from room temperature to high temperature and expandability from low temperature, but also has the ability to withstand harsh handling at room temperature. It has excellent flexibility to withstand even the most severe conditions. Next, the reason for limiting the mixing ratio of each material used in the sheet-like article of the present invention will be explained. If unexpanded vermiculite is less than 40% by weight, it will not be able to expand effectively at low temperatures and will lack elasticity.
On the other hand, if it exceeds 83% by weight, it becomes difficult to form a sheet unless a large amount of binder is used, so the content must be within the range of 40 to 83% by weight. If the binder is less than 0.5% by weight, it will be difficult to form a sheet, and if it exceeds 3.5% by weight, the elasticity and expansion rate at low temperatures will be insufficient, so the content must be within the range of 0.5 to 3.5% by weight. Next, the present invention will be described with reference to examples. Example 1 800 g of water and 8 kg of commercially available ceramic fibers with a shot content of 52% were charged into a high-speed mixer with a capacity of 1 m ³ and stirred for 15 minutes to prepare a slurry of ceramic fiber floc. On the other hand, pressurized water with a flow rate of 170/min and a water pressure of 1.5 Kg/cm ² was sent from the side wall of a cylindrical container with a capacity of 25 to generate an eddy flow inside the cylindrical container.
The slurry of the ceramic fiber flocs is introduced into the center of the vortex from the top of this cylindrical container at a flow rate of 80/min, and after loosening the ceramic fiber flocs, the slurry is allowed to flow out from the center of the vortex.
Ceramic fibers were collected by guiding them onto a 30-mesh wire mesh. Ceramic fibers with a shot content of 13% and an average fiber length of 38 mm were thus obtained. Next, 1.7 g of sepiolite, 208 g of commercially available unfired South African vermiculite No. 1 (particle size 0.42 to 1.41 mm),
126g of the above ceramic fiber and 26ml of acrylonitrile butadiene latex (solid content 40%) for 8000
ml of water and thoroughly stirred and mixed. In this slurry, commercially available polyacrylamide flocculant 0.1
% aqueous solution and 5 ml of a 10% sulfuric acid band aqueous solution were added and mixed with stirring. The slurry thus prepared was made into paper using a square hand paper machine to obtain a paper product with a thickness of approximately 18 mm. After drying this paper product at 100℃, it was placed between stainless steel plates and pressed.
A sheet-like product of the present invention having a size of 30 cm and a thickness of 5.5 mm was obtained. Example 2 800 g of water and 8 kg of commercially available ceramic fibers with a shot content of 52% were charged into a high-speed mixer with a capacity of 1 m ³ and stirred for 15 minutes to prepare a slurry of ceramic fiber floc. On the other hand, pressurized water with a flow rate of 170/min and a water pressure of 1.5 Kg/cm ² is sent from the side wall of a cylindrical container with a capacity of 25 to generate an eddy flow inside the cylindrical container, and from the top of the cylindrical container to the center of the eddy flow as described above. After introducing the slurry of ceramic fiber flock at a flow rate of 80/min to loosen the ceramic fiber flock,
This slurry was flowed out from the center of the whirlpool and guided onto a 30-mesh wire mesh to collect ceramic fibers. Ceramic fibers with a shot content of 21% and an average fiber length of 38 mm were thus obtained. Next, 1.7 g of sepiolite, 126 g of the above ceramic fibers, 208 g of commercially available unfired South African vermiculite treated in a sodium acetate aqueous solution with a concentration of 1N and a temperature of 70°C for 1 hour, and acrylonitrile butadiene latex (solid content 40 %) was added to 8000 ml of water and thoroughly stirred and mixed. In this slurry, a commercially available polyacrylamide flocculant 0.1% aqueous solution 8
ml and 5 ml of a 10% aqueous solution of band sulfate were added and stirred and mixed. The slurry thus prepared was made into paper using a square hand paper machine to obtain a paper product with a thickness of approximately 17 mm. After drying this paper product at 100℃, it was placed between stainless steel plates and pressed.
A 5.5 mm sheet-like product of the present invention was obtained. Example 3 800 g of water and 8 kg of commercially available ceramic fibers with a shot content of 52% were charged into a high-speed mixer with a capacity of 1 m ³ and stirred for 15 minutes to prepare a slurry of ceramic fiber floc. On the other hand, pressurized water with a flow rate of 170/min and a water pressure of 1.5 Kg/cm ² was sent from the side wall of a cylindrical container with a capacity of 25 to generate an eddy flow inside the cylindrical container.
The slurry of the ceramic fiber flocs is introduced into the center of the vortex from the top of this cylindrical container at a flow rate of 80/min, and after loosening the ceramic fiber flocs, the slurry is allowed to flow out from the center of the vortex.
Ceramic fibers were collected by guiding them onto a 30-mesh wire mesh. In this way, ceramic fibers with a shot content of 13% and an average fiber length of 38 mm were obtained. Next, 0.3g of sepiolite, 206g of the above ceramic fiber, concentration 1
Add 139 g of commercially available uncalcined South African vermiculite treated with an aqueous sodium acetate solution at a specified temperature of 70°C for 1 hour, and 3.5 ml of acrylonitrile butadiene latex (solid content 40%) to 8000 ml of water and stir thoroughly. Mixed. To this slurry, 3 ml of a commercially available polyacrylamide flocculant 0.1% aqueous solution and 3 ml of a 10% sulfuric acid aqueous solution were added and stirred.
Mixed. The slurry thus prepared was made into paper using a square hand paper machine to obtain a paper product with a thickness of approximately 16 mm. After drying this paper product at 100°C, it was placed between stainless steel flat plates and pressed to obtain a sheet-like product measuring 30 x 30 cm and 5.5 cm thick. This sheet-like product was sealed with a polyethylene film having a thickness of 10 μm to obtain a sheet-like product of the present invention. Example 4 800 g of water and 8 kg of commercially available ceramic fibers with a shot content of 52% were charged into a high-speed mixer with a capacity of 1 m ³ and stirred for 15 minutes to prepare a slurry of ceramic fiber floc. On the other hand, pressurized water with a flow rate of 170/min and a water pressure of 1.5 Kg/cm ² is sent from the side wall of a cylindrical container with a capacity of 25 to generate an eddy flow inside the cylindrical container, and from the top of the cylindrical container to the center of the eddy flow. The slurry of the ceramic fiber flock was introduced at a flow rate of 80/min to loosen the ceramic fiber flock, and then the slurry was flowed out from the center of the eddy flow and introduced onto a 30-mesh wire gauze to collect the ceramic fibers. In this way, shot content 21
%, and the average fiber length was 38 mm. Next, 1.7g of sepiolite, 57g of the above ceramic fiber,
277 g of commercially available uncalcined South African vermiculite treated with an aqueous solution of sodium acetate at a concentration of 1N and a temperature of 70°C for 1 hour, and 26 ml of acrylonitrile butadiene latex (solid content 40%) were added to 8000 ml of water and stirred thoroughly. , mixed. To this slurry were added 8 ml of a commercially available 0.1% aqueous solution of polyacrylamide flocculant and 5 ml of a 10% aqueous solution of sulfuric acid, followed by stirring and mixing. The slurry thus prepared was made into paper using a square hand paper machine to obtain a paper product with a thickness of approximately 10 mm. After drying this paper product at 100℃, it was placed between stainless steel plates and pressed.
A sheet-like product with a thickness of 5.5 cm and a thickness of 5.5 cm was obtained. Comparative example 1 Commercially available ceramic fiber (shot content 50%)
104g, commercially available uncalcined South African Vermiculite No. 1 (particle size 0.42-1.41mm) 208g, sepiolite 17g, acrylonitrile butadiene latex (solid content 40%) 43ml, commercially available polyacrylamide coagulant 0.1% aqueous solution 80ml , sulfate band 10%
Using 11 ml of aqueous solution, 30
A sheet-like product with a size of 30 cm and a thickness of 5.5 mm was obtained. Comparative example 2 Commercially available ceramic fiber (shot content 50%)
139g, commercially available uncalcined South African Vermiculite No. 1 (particle size 0.42-1.41mm) 139g, sepiolite 35g, acrylonitrile butadiene latex (solid content 40%) 87ml, commercially available polyacrylamide coagulant 0.1% aqueous solution 170ml , sulfate band 10%
Using 17 ml of aqueous solution, 30
A sheet-like product with a size of 30 cm and a thickness of 5.5 mm was obtained. The following evaluation tests of elasticity, flexibility, and expansion coefficient at room temperature and high temperature were conducted on the sheet-like materials of Examples 1 to 4 above, and the results were evaluated in the first test together with the comparative examples.
Shown in the table. The elasticity evaluation test at room temperature conducted on the sheet material of the present invention was a test based on the modified method of ASTM F-36-79, in which the penetrator was replaced with an anvil of 10 cm in diameter, and a 25 mm square test was performed. This method applies a load of 12.5 kg to a piece and measures the compression ratio and recovery ratio. Also, what is the elasticity evaluation test at high temperature?
A method in which a 20 mm square test piece is repeatedly compressed to 40% of its original thickness in an atmosphere of 900°C, the compression restoring force of the sheet at that time is measured, and the change due to the repetition is recorded. It is. The larger the value of this restoring force and the smaller the rate of decrease due to repetition, the better the elasticity is evaluated. Furthermore, the flexibility evaluation test is a method of measuring the radius of a roll that can be rolled without breaking. Also, the expansion rate is 25mm square sheet material.
Calculated by firing in a furnace at 120 to 400°C for 1 hour and measuring the amount of expansion in the cold.

[Table] As can be seen from Table 1, the sheet materials shown in Examples 1 to 3, in which the initial 52% shot of the present invention was reduced to 21% or less by removal treatment, were all heated at room temperature. It had a compression rate of over 30% and a high restoration rate of over 86%. On the other hand, regarding elasticity at high temperatures, the compression restoring force decreases by only about 30% after 150 repeated compressions, and the sheet shape of the present invention has flexibility, such as being able to be rolled into rolls with a radius of 1 to 5 cm. The material had excellent elasticity and flexibility. Furthermore, the sheet-like material of the present invention already begins to expand at a low temperature of about 130° C., demonstrating the effect of the low binder content. In addition, the sheet materials of Examples 2, 3, and 4 using unexpanded vermiculite treated with an aqueous sodium acetate solution had extremely high expansion rates. As mentioned above, the sheet-like material of the present invention has excellent elasticity from room temperature to high temperature, which has not been seen in conventional materials of this type, as can be seen from the examples, due to the combination of a small amount of binder and ceramic fibers with few shots. It is a new material that has properties such as strength, flexibility, and expandability at low temperatures, and is expected to have a wide range of uses as various sealing materials and packing materials.

Claims (1)

[Scope of Claims] 1. 40 to 83% by weight of unexpanded vermiculite, 0.5 to 3.5% by weight of a binder with a ratio of inorganic binder to organic binder of 1/2 to 1/10, and the remainder being shot content. 30%
A heat-resistant elastic sheet material comprising the following ceramic fibers. 2 The particle size of the unexpanded vermiculite is 0.1
The sheet-like article according to claim 1, characterized in that the thickness is within the range of ~2.83 mm. 3. The ceramic fibers are produced by electrically melting silica and alumina, and blowing the resulting stream with high-pressure air or water vapor.
The sheet-like article according to claim 1 or 2, which is a fiber having a temperature of 850°C or higher. 4 40 to 83% by weight of unexpanded vermiculite, 0.5 to 3.5% by weight of a binder with a ratio of inorganic binder to organic binder of 1/2 to 1/10, the remainder being shot content 30%
Made of the following ceramic fibers, ASTM F-36
-Using a 2 inch square anvil based on the 79 test.
Compression of over 30% and 85 when tested under a load of 12.5Kg
The sheet-like material according to any one of claims 1 to 3, wherein the sheet-like material has a recovery rate of % or more. 5. A sheet-like material consisting of 40 to 83% by weight of unexpanded vermiculite, 0.5 to 3.5% by weight of a binder with a ratio of inorganic binder to organic binder of 1/2 to 1/10, and the remainder substantially consisting of ceramic fibers. An organic polymer film is attached to one or both sides of the
Based on 79 tests using a 2 inch square anvil.
Compression of over 30% and 85 when tested under a load of 12.5Kg
The sheet-like material according to any one of claims 1 to 3, wherein the sheet-like material has a recovery rate of % or more. 6 40 to 83% by weight of unexpanded vermiculite, 0.5 to 3.5% by weight of a binder with a ratio of inorganic binder to organic binder of 1/2 to 1/10, the remainder being shot content 30%
1. A heat-resistant elastic sheet-like material comprising the following ceramic fibers, the entire surface of which is sealed with an organic polymer film. 7 The particle size of the unexpanded vermiculite is 0.1
The sheet-like article according to claim 6, characterized in that the thickness is within the range of ~2.83 mm. 8 The ceramic fibers are produced by electrically melting mainly silica and alumina, and blowing out the trickle with high-pressure air or water vapor.
The sheet-like article according to claim 6 or 7, which is a fiber having a temperature of 850°C or higher. 9. The sheet-like article according to any one of claims 6 to 8, wherein the weight of the organic polymer film is 0.5% by weight or less of the weight of the sheet-like article. . 10 A sheet-like material consisting of 40 to 83% by weight of unexpanded vermiculite, 0.5 to 3.5% by weight of a binder with a ratio of inorganic binder to organic binder of 1/2 to 1/10, and the remainder substantially consisting of ceramic fibers. The entire surface is sealed with an organic polymer film, and when tested under a load of 12.5 kg using a 2-inch square anvil based on the ASTM F-3679 test, it must compress by more than 30% and recover by more than 85%. A sheet-like article according to any one of claims 6 to 9, characterized in that: