JPH06238810A - Inorganic heat insulating material and production thereof - Google Patents

Abstract

PURPOSE:To obtain an inorg. heat insulating material excellent in fire retardancy or non-combustibility and strength. CONSTITUTION:Paper composed of pulp subjected to fire-retardant treatment or non-combustible treatment is laminated on the surface of inorg. foam or on the surface of the inorg. cured material layer provided on the surface of the inorg. foam as a skin layer or single-sided corrugated card board formed from the above mentioned paper is laminated to the inorg. foam on the core side thereof to obtain an inorg. heat insulating material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inorganic heat insulating material used for heat insulation of buildings, pipes and the like, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, heat insulating materials have been widely used for walls and ceilings of buildings, pipes for steam, cold and hot water, and the like. Above all,
From the viewpoint of safety, a heat insulating material made of a nonflammable inorganic material has been demanded. As this type of inorganic heat insulating material, glass wool (JIS A-950) specified in JIS is used.
5), calcium silicate (JIS A-9510), water-repellent perlite (JIS A-9512), rock wool (JIS A-9504), water glass foam foam and the like.

However, the above heat insulating material has the following problems. Since glass wool and rock wool are fibrous,
Water easily enters inside, and the heat insulation is easily damaged. Since glass wool uses phenolic resin as a binder, it is not an incombustible material in the original sense.

Materials such as calcium silicate and water repellent perlite are brittle and powdery, and their handling is complicated when they are used as a heat insulating material. Overall strength is low, including water glass foam. Therefore, Japanese Patent Publication No. 52-22942, Japanese Patent Publication No. 54-
Various methods for solving these problems have been proposed in Japanese Patent No. 15882, Japanese Patent Application Laid-Open No. 48-55922, Japanese Patent Publication No. 58-49369, Japanese Patent Publication No. 4-45471.

However, these previously proposed methods still have unsolved problems and have not been put to practical use. That is, for example, Japanese Patent Publication No. 52-2294
Japanese Patent Publication No. 2 proposes a method of manufacturing a heat insulating material in which a material containing water glass as a main component is heated and foamed on a metal plate, and the foam and the metal plate for reinforcement are integrated. However, since the metal plate obtained at low cost does not have alkali resistance, there is a problem that the surface will be damaged when laminating water glass that is alkaline, or that confidence will cause rust, etc. Not.

Japanese Patent Publication No. 54-15882 proposes a heat insulating material in which an asbestos plate or a similar non-combustible sheet and a water glass foam are laminated. This heat insulating material is
If the asbestos plate is thick, the weight of the heat insulating material will be heavy, and the use place will be limited.If it is thin, the strength will be small and there will be no laminating effect, and asbestos itself has a problem in its safety, so it will be put to practical use. I haven't been done.

In Japanese Patent Application Laid-Open No. 48-55922, a heat insulating material having a skin layer made of alkali silicate and an alkali silicate water resistance-imparting agent is formed on the surface of an alkali silicate foam, and asbestos paper is laminated on this surface. I have proposed a heat insulating material, but without asbestos paper it is weak in impact resistance, for example it will crack or break when performing a falling body test,
Also, the use of asbestos paper has a safety problem.

In Japanese Examined Patent Publication No. Sho 58-49369, a slurry is prepared by casting a slurry containing hydraulic cement as a main material and water and a foaming agent into a mold having air-permeable mats on the front and back. Although a method of forming skin layers on the front and back surfaces has been proposed, even when a foam obtained by using this method is used, the strength of the foam obtained in the same manner as above is insufficient. For example, a drop test is performed. It breaks and breaks, and it has not been put to practical use.

Japanese Patent Publication No. 4-45471 proposes a molding material obtained by mixing an oxide mixture containing amorphous silicon dioxide and aluminum oxide, an alkali silicate aqueous solution and a foaming agent. Even a cured foam has insufficient strength.

[0010]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned conventional problems and is excellent in flame retardancy or nonflammability.
In addition, the object is to provide an inorganic heat insulating material having excellent strength and a method for producing the same.

[0011]

In order to achieve the above object, the invention according to claim 1 of the present application (hereinafter referred to as "invention 1") is such that a sheet material is laminated on at least one side of an inorganic foam, The sheet material is an inorganic heat insulating material, which is a paper made of pulp that is flame-retardant or non-combustible. Invention 1
In the above, the inorganic foam is not particularly limited, but one obtained by adding a foaming agent to a slurry containing an inorganic curable material as a main component, foaming and curing, is preferably used.

As the inorganic curable material, ordinary Portland cement, special Portland cement, alumina cement, acid resistant cement, refractory cement, cement such as gypsum, alkali metal silicate (SiO ₂ / R ₂ O) aqueous solution and a curing agent are used. Examples thereof include those added, and those obtained by adding SiO ₂ —Al ₂ O ₃ -based powder to an alkali metal silicate (SiO ₂ / R ₂ O) or alkali metal hydroxide aqueous solution.

Among them, ordinary Portland cement, which has excellent water resistance and can be hardened even at a low temperature,
Alumina cement is preferred. Also, in the formulas in parentheses in and, R represents an alkali metal, for example, L
Examples thereof include i, Na, K, and Rb. Among them, Na and K are preferable because they are easily available, cost, and easy to foam and cure, and K is more preferable in terms of water resistance. SiO ₂ / R
_The molar ratio of ₂ O is preferably 0.5 to 4.0.

As the curing agent in the above, for example, cements, fluorides, acidic metal oxides, divalent or higher valent metal salts of higher fatty acids, and divalent or higher valent metals of carboxyl group-containing water-soluble polymers. Examples thereof include salts, divalent metal sulfates, and divalent metal sulfites. As a foaming agent, Mg,
Ca, Cr, Mn, Fe, Co, Ni, Cu, Zn, A
l, Ga, Sn, Si, metallic foaming agents such as ferrosilicon, hydrogen peroxide, sodium peroxide, potassium peroxide,
Examples thereof include peroxides such as sodium perborate, and among them, Al-based foaming agents and hydrogen peroxide are preferably used in terms of cost, safety, availability, and the like. The amount of the foaming agent added is determined by the density of the desired inorganic foam.

Fibers, fillers, foaming aids, thickeners and the like are added to the inorganic foamable slurry of the first invention, if necessary. Fibers are those added to improve the strength and prevent cracking of the resulting inorganic foam, for example, vinylon fiber, polypropylene fiber, aramid fiber, acrylic fiber, rayon fiber, carbon fiber, glass fiber, Potassium titanate fiber, alumina fiber, steel fiber, slag wool, etc. are used.

The fiber length is preferably in the range of 1 to 15 mm. If the length exceeds 15 mm, the dispersibility of the fibers in the inorganic foamable slurry tends to decrease, and conversely 1 mm.
If it is less than the above range, the effect of improving the strength and preventing cracks of the obtained inorganic foam may be reduced. The fiber diameter is preferably in the range of 1 to 500 μm. When the diameter is less than 1 μm, the fibers are re-aggregated during the mixing of the fibers in the inorganic foaming slurry to form a fiber ball, which makes it difficult to improve the strength. On the contrary, when the diameter exceeds 500 μm, the resulting inorganic foam is obtained. There is a possibility that the effect of improving the strength of and the effect of preventing cracks may decrease.

The amount of fibers added is preferably 10 parts by weight or less with respect to 100 parts by weight of the curable material. If the amount added exceeds 10 parts by weight, the dispersibility of the fibers in the inorganic foamable slurry is likely to deteriorate. The filler is added in order to reduce shrinkage during curing of the obtained inorganic foam, densify the cells, and improve the fluidity of the inorganic foaming slurry, and for example, silica sand and silica stone powder. , Fly ash, slag, silica fume, mica, talc, wollastonite, calcium carbonate and the like are used.

The particle size of the filler is preferably 1 mm or less.
When the particle size exceeds 1 mm, foaming tends to be unstable. The addition amount of the filler is preferably 100 parts by weight or less with respect to 100 parts by weight of the curable material. If the amount added exceeds 100 parts by weight, the strength of the resulting inorganic foam tends to decrease.

The foaming aid is added to stabilize the foaming of the inorganic foamable slurry, and is, for example, silica gel, zeolite, activated carbon, porous powder such as alumina gel, stearic acid metal salt or the like. Metal soap such as metal salt of palmitic acid is used. The addition amount of the foaming aid is preferably 5 parts by weight or less with respect to 100 parts by weight of the curable material. If the amount added exceeds 5 parts by weight, the bubbles are likely to break and the foaming tends to be adversely affected.

As the thickener, for example, methyl cellulose, polyacrylamide, polyvinyl alcohol, carboxymethyl cellulose and the like are used. The amount of water added to the inorganic foamable slurry is preferably 20 to 100 parts by weight. If the addition amount exceeds 100 parts by weight, the viscosity of the inorganic foaming slurry is low and the foaming is not stable, and the strength of the resulting inorganic foam tends to decrease. On the contrary, when the addition amount is less than 20 parts by weight. Has a high viscosity of the inorganic foamable slurry,
It tends not to foam sufficiently.

In the present invention 1, the sheet material is a paper made of flame-retarded or non-combustible pulp, which is obtained by precipitating and fixing a water-insoluble inorganic substance in or on the structure of the pulp. Examples of the paper include a paper obtained by making a flame-retarded or non-flammable pulp, and a paper made from a pulp made from the paper, which is flame-retarded or made non-combustible. Also, in the paper,
Glass fibers and organic synthetic fibers may be mixed. However, when organic synthetic fiber is mixed, the addition amount is
20% by weight or less is preferable. If the amount added exceeds 20% by weight, flame retardancy or nonflammability tends to be impaired.

A method for treating the flame-retardant or incombustible pulp
For example, pulp was esterified with phosphoric acid.
Liquid, described in Japanese Examined Patent Publication No. 49-48600
Eel, polyphosphoric acid obtained by reacting urea and phosphoric acid in advance.
A solution in which urea is dissolved in a solution in which ammonium is dissolved.
After impregnating the pulp with the liquid of the deoxidizing agent and drying it, hot air is used.
Method of heating reaction in an aqueous solution of multiple inorganic compounds
Are sequentially impregnated into pulp, and Ba₃(PO_Four)₂, CaH
PO_Four, Al (H₂PO_Four)₃, Ca (OH) ₂, Al
(OH)₃, Fe (OH)₂, CaCO₃, Al₂(C
O₃)₂, BaHBO₃, CaSO_Four, BaSO_Four, A
Precipitate water-insoluble salts such as patite and ettringite.
Methods such as barium chloride and boric acid in aqueous pulp
Dip, and then add ammonium phosphate and boric acid in water.
Immerse the pulp in the liquid to precipitate barium phosphate
Methods and the like.

In general, pulp is charged with anions in water, whereas pulp treated in this way is charged with cations, so that the adhesion to the inorganic curable material is improved. The thickness of the sheet material is preferably 50 to 500 g / m ² . If the thickness is less than 50 g / m ² , the strength of the sheet material is insufficient, and the reinforcing effect is small even when combined with the inorganic foam, and conversely, if it exceeds 500 g / m ² , the sheet material It tends to be inflexible, making it difficult to fabricate the heat insulating material into a desired shape.

In the present invention 1, the inorganic foam is less likely to absorb water as compared with a fibrous material such as glass wool, but if rain or the like soaks in and absorbs water, the heat insulating performance deteriorates. Is preferably water repellent. The method for treating the sheet material with water repellent may be a method of adding a water repellent agent and fixing it during the papermaking process of the pulp, or a method of treating the sheet material with a water repellent agent. May be

In the former method, as the water-repellent agent, an internal-added water-repellent agent such as a building material can be used in addition to an internally-added size agent used in papermaking. Examples of the internally added sizing agent include rosin, alkyl ketene dimer, and alkenyl succinic anhydride. As the internally added water repellent, for example, silicone oil, fatty acid metal salt, paraffin, emulsion of fatty acid, or the like is used.

In the latter method, a surface sizing agent used in papermaking, an externally added water repellent used in building materials, etc. are used. As the surface sizing agent, for example, alkyl ketene dimer, wax emulsion and the like are used. As the water repellent for external addition, for example, a water-based or solvent-based penetrating water absorption inhibitor, a silane-based water repellent used as a fiber water repellent, a silicone oil as it is, or an emulsion thereof is used.

The treatment amount of the water repellent varies depending on the kind of the water repellent, but it is preferable to treat the amount such that the contact angle with water is 90 ° or more. By thus treating the sheet material with water repellency, it becomes possible to secure the water repellency while the sheet material has moisture permeability, and the water resistance of the inorganic heat insulating material is improved. Further, in order to further improve the water repellency of the entire inorganic heat insulating material in which the sheet material is laminated on at least one surface of the inorganic foam in the present invention 1, the inorganic heat insulating material may be subjected to a water repellent treatment later.

As the water repellent used at this time, the above-mentioned surface sizing agents, water repellents for external addition, etc. are used, and particularly water-based or solvent-based silane-penetrating water-absorption inhibitors are preferably used. It Since this water repellent is a mechanism in which a silane monomer or oligomer with a small molecule permeates the paper to fix and polymerize it to make it water repellent, the water repellent can be easily transferred to the inorganic foam through the skin sheet material. Because it is transparent.

Since the water repellent treatment prevents water absorption inside the inorganic foam, the inorganic foam does not absorb water even when the sheet material of the skin is broken. In the present invention 1, as a method for laminating the inorganic foam and the sheet material, for example, after the inorganic foam is produced in advance using the above-mentioned inorganic curable substance, inorganic adhesive, water glass, etc. A method of adhering a sheet material to the foam may be adopted.

As the adhesive used at this time, it is preferable to use an inorganic curable substance which is one of the materials for producing an inorganic foam. The reason is that the same material exhibits high adhesiveness, and that the adhesive layer behaves the same as the inorganic foam with respect to heat and moisture, so that the inorganic foam and the adhesive layer This is because it is difficult to peel off between them. The invention according to claim 2 of the present application (hereinafter referred to as "present invention 2")
Is an inorganic heat insulating material in which a sheet material is laminated on the outer peripheral surface of a tubular inorganic foam that is split into at least two parts so that a crack is formed in the longitudinal direction, leaving one part of the crack.

In the second aspect of the present invention, the same inorganic foam and sheet material as in the first aspect are used. The thickness of the sheet material is preferably 250 g / m ² or less.
If the thickness is more than this, it becomes difficult to form a cylinder. If necessary, as in the case of the first aspect of the invention, the sheet material may be subjected to a water repellent treatment by a pretreatment, or may be subjected to a water repellent treatment by a posttreatment of the entire inorganic heat insulating material. Good.

In the second aspect of the present invention, the cylindrical inorganic foam is divided so as to form a split in the vertical direction, and two splits are formed in the vertical direction.
It may be divided into three parts, or may be divided into three or more parts so that three or more cracks are formed in the vertical direction. Hereinafter, an example of the present invention 2 will be described with reference to the drawings.

FIG. 1 is a plan view showing an example of the inorganic heat insulating material of the present invention 2. The cylindrical inorganic foam 1 is formed of half-split pieces 11 and 12 that are split into two pieces so that two splits 13 and 14 are formed in the vertical direction. One of the cracks 13 is formed on the outer peripheral surface of the cylindrical inorganic foam 1.
The sheet material 2 is laminated on the entire circumference of the sheet except for the portion.

In the portion of the crack 14 where the sheet material 2 is laminated, the outside of the crack 14 is covered with the sheet material 2 and hinged. Then, centering on the hinge-connected portion of the covered sheet material 2, the split portion 13 can be opened and closed as an opening. FIG. 2 is a plan view showing another example of the inorganic heat insulating material of the present invention 2.

In addition to the configuration of the example shown in FIG. 2 (in the figure, only the reference numerals are given as in FIG. 1 and the description thereof is omitted), further, a sheet material laminated on the outer peripheral surface of the half-split piece 11. An engaging portion 21 is provided so as to extend from the end portion of 2, that is, the portion of the crack 13. An adhesive layer 22 is provided on the surface of the locking portion 21 on the half-divided piece 12 side, and a crack 13 serving as an opening / closing portion is formed.
In the closed state, it can be locked on the sheet material 2 laminated on the outer peripheral surface of the opposite half-split piece 12 so as to straddle the remaining cracks 13.

The invention according to claim 3 of the present application (hereinafter referred to as "present invention 3") is the one-sided sheet material according to the present invention 1 or 2, wherein the sheet material is made of paper made of flame-retarded or non-combustible pulp. A corrugated board, which is an inorganic heat insulating material laminated with its core side facing the inorganic foam side. In Invention 3, the same inorganic foam as in Invention 1 is used.

Further, the one-sided corrugated board used in the present invention 3 is the following structure. As shown in FIG. 4, the one-sided corrugated board 4 is a corrugated core 41 made by bending the paper into a wavy shape. , A liner (flat paper) 42 is adhered to only one side thereof. In addition,
Corrugated board is generally defined in JIS Z-1516, but is not limited to this in the present invention, and as the core 41, if the paper is continuously bent, The wave pitch, the wave height, etc. are not particularly limited. The liner 42 is also not particularly limited as long as it is a substantially flat paper.

For example, the shape shown in FIG. 5 may be used, but it is desirable that the ratio of the lengths of the bonded portion and the non-bonded portion in the liner 42 is 1 or less. Ie 1
If it exceeds, the reinforcing effect may be reduced. The number of waves in the core is preferably about 30 to 100/30 cm. That is, if the number of waves is too large, the height of the waves cannot be sufficiently increased to a height necessary for reinforcement, and there is a possibility that processing becomes difficult. If the number is too small, it is laminated with an inorganic foam. At this time, the paper in the portion not bonded to the core 41 of the liner 42 is easily broken.

The wave height is preferably 1 to 10 mm. That is, when the wave height is 1 mm or less, the reinforcing effect is small, and when the wave height is 10 mm or more, the proportion of the corrugated cardboard in the whole heat insulating material is large, so that the heat insulating performance tends to decrease. For the adhesion between the core 41 and the liner 42, a starch-based adhesive that is usually used in the production of corrugated cardboard can be used, but in order to prevent the inorganic foamable material from peeling off due to moisture, it is possible to use an alkaline agent such as resorcinol or ketone resin. It is advisable to add a curable condensation resin. In addition, polyvinyl acetate emulsion, polyvinyl alcohol to which a filler and a gelling agent are added, and the like can be used. Material As the flame-retardant paper or the non-combustible paper, the same one as in the first embodiment is used.

In the third aspect of the invention, if necessary, similar to the first aspect of the invention, the sheet material may be subjected to a water repellent treatment by a pretreatment, or the inorganic heat insulating material as a whole may be subjected to a water repellent treatment. May be performed. The invention according to claim 4 of the present application (hereinafter, referred to as "present invention 4") is the inorganic heat insulating material of the present invention 1 to 3, which has a higher specific gravity than the inorganic foam layer between the inorganic foam and the sheet material. It is an inorganic heat insulating material in which a skin layer made of an inorganic cured material is formed.

In Invention 4, the same inorganic foam as in Invention 1 is used. Further, as the sheet material, the same one as in the present inventions 1 to 3 is used. On the other hand, the inorganic cured body which becomes the skin layer must have a specific gravity of 1.3 or more, preferably 1.6 or more, and 0.1 mm bubbles per volume of 5% or less, preferably 2% or less. That is,
If the specific gravity is less than this, the strength of the skin layer portion becomes small, and the effect of the present invention 4 may not be obtained. Also, the large bubbles become defects of strength, and when stress is applied, destruction progresses from this portion, so
If the amount of bubbles of 1 mm is larger than this, the skin layer may lose its effect.

Such a skin layer does not contain a foaming agent, a foaming agent, or a weight-reducing material having a bulk specific gravity of 1.0 or less in the slurry of the material, and is sufficiently mixed and kneaded so that there is no defective dispersion of the compounded material. It can be obtained by using a mixer having sufficient mixing power such as an Erich mixer, an omni mixer, a forced kneading mixer and a hand mixer for 1 minute or more.

The skin layer preferably has a thickness of 0.1 to 2 mm.
That is, if it is 0.1 mm or less, the synergistic effect of the skin layer and the flame-retardant paper cannot be obtained, and if it is 2 mm or more, the weight as a whole becomes large, and the workability such as cutting property of this heat insulating material is deteriorated. There is a risk that it will end up. As a method for producing the inorganic heat insulating material of the present invention 4, the material for the skin layer is applied to the sheet material in advance,
A method of pouring an inorganic foaming material from above, foaming this material, and curing the whole is preferable, but in advance, a sheet material is provided through an adhesive on an inorganic foamed layer integrally provided with a skin layer. You may make it laminate | stack.

As the adhesive, the same adhesive as in the present invention 1 can be used. The invention according to claim 5 of the present application (hereinafter,
In order to obtain the inorganic heat insulating material of the present inventions 1 to 3, "sheet 5" is provided with a sheet material in a mold, and an inorganic foaming material containing an inorganic curable material and a foaming agent as a main component in the mold. This is a method for producing an inorganic heat insulating material, in which a material is supplied, an inorganic foamable material is foamed in a mold, and a sheet material is laminated on one surface of the inorganic foam.

In order to obtain the inorganic heat insulating material of the present inventions 1 to 3, the invention according to claim 6 of the present application (hereinafter, referred to as "present invention 6") is such that a sheet material is mounted in the mold and the inorganic heat insulating material is placed in the mold. An inorganic foaming material containing a curable material and a foaming agent as a main component is supplied, and a sheet material is attached to the surface of the inorganic foaming material,
This is a method for producing an inorganic heat insulating material, in which a sheet material is laminated on both surfaces of an inorganic foam by foaming an inorganic foamable material in a mold.

In the present invention 5 and the present invention 6, the same inorganic foam material and sheet material as in the present invention 1 are used.
If necessary, as in the case of the first aspect of the invention, the sheet material may be subjected to a water repellent treatment by a pretreatment, or may be subjected to a water repellent treatment by a posttreatment of the entire inorganic heat insulating material. Good. In the present invention 5 and the invention 6, the mold may be a mold whose upper part is simply filled with an inorganic foamable material, or may be a fixed mold that can be opened and closed and a movable mold that is a closed mold. A molding die may be formed in which a space having an inner surface shape corresponding to the outer surface shape of the inorganic heat insulating material to be molded is formed inside.

In the present invention 5 and the invention 6, since the sheet material is charged with cations as described above, the adhesiveness with the inorganic curable material charged with anions and the inorganic foamable material containing a foaming agent as a main component. Is excellent, the inorganic heat insulating material obtained by foaming an inorganic foamable material, at least one surface of the inorganic foam, a sheet material is laminated, the sheet material is adhered to the inorganic foam body with an adhesive. There is an advantage that the bonding becomes stronger and the bonding step can be omitted more than that obtained by the above.

Further, when the obtained inorganic heat insulating material is released from the mold, the sheet material is interposed between the inorganic foam material and the mold surface, so that there is an advantage that the mold release is facilitated. . The invention according to claim 7 of the present application (hereinafter referred to as "present invention 7")
In order to obtain the inorganic heat insulating material of the present invention 3, the sheet material is a one-sided corrugated board made of paper made of flame-retarded or non-combustible pulp. After mounting the sheet material in the mold, This is a method for producing an inorganic heat insulating material in which an inorganic foaming material is poured into the core side to foam and cure.

In the present invention 7, as the inorganic foam material and the one-sided corrugated board as the sheet material, the same ones as in the invention 3 are used. If necessary, as in the case of the first aspect of the invention, the sheet material may be subjected to a water repellent treatment by a pretreatment, or may be subjected to a water repellent treatment by a posttreatment of the entire inorganic heat insulating material. Good. As the mold, the same molds as in the present inventions 5 and 6 can be used.

In order to obtain the inorganic heat insulating material of the present invention 4, the invention according to claim 8 of the present application (hereinafter, referred to as "present invention 8") is such that after a sheet material is mounted in a mold, a foaming agent is applied to the sheet material. This is a method for producing an inorganic heat insulating material, which comprises applying an inorganic curable material to which no additive has been applied, and then pouring an inorganic foamable material obtained by adding a foaming agent to the inorganic curable material, foaming and curing the applied material.

In the present invention 8, the same inorganic foam materials and sheet materials as those of the present inventions 1 to 3 are used. In the present invention 8, the inorganic curable material that serves as the skin layer may be applied to the sheet material after the is set on the mold or before it is set on the mold. Also, application of an inorganic curable material,
It can be performed with a brush, a spray, a roll coater, etc. However, for example, when applying with a brush or spraying, it is easier to pre-install a sheet material on the formwork, and also with a roll coater, etc. In this case, it is necessary to apply it to the sheet material in advance.

As the inorganic curable material for forming the skin layer,
It is preferable to use an inorganic foamable material that forms a foam without adding a foaming agent. That is, the inorganic foamable material is obtained by mixing a compound other than the foaming agent with a mixer or the like to obtain a slurry, and then adding the foaming agent immediately before molding the slurry. Therefore, it is possible to easily manufacture the material for the skin layer by using the slurry before adding the foaming agent to form the material for the skin layer as it is, or by further adding another material to the slurry and using it.

The invention according to claim 9 of the present application (hereinafter referred to as "present invention 9") supplies a water repellent agent to the surface of the sheet material of the inorganic heat insulating material according to any one of the present inventions 1 to 4, It is a method for producing an inorganic heat insulating material in which a water repellent is permeated to the inside of an inorganic foam. In the present invention 9, a water-based or solvent-based silane-penetrating water absorption inhibitor is particularly preferably used as the water repellent.

Since this water repellent is a mechanism in which a silane monomer or oligomer having a small molecule permeates the paper to fix and polymerize it to make it water repellent, the water repellent is easily made inorganic through the sheet material of the skin. This is because even the foam penetrates.

[0055]

The inorganic heat insulating material of the present invention 1 has a flame retardant property because the sheet material is laminated on at least one surface of the inorganic foam, and the sheet material is made of flame-retarded or non-combustible pulp. Alternatively, it has excellent nonflammability and strength. In the inorganic heat insulating material of the present invention 2, a sheet material is laminated on the outer peripheral surface of a cylindrical inorganic foam body that is split into at least two parts so that a crack is formed in the longitudinal direction, leaving one part of the crack. Since it has excellent flame retardancy or noncombustibility and strength, and is centered on the hinge-connected portion of the sheet material 2 outside the coated crack,
Since the remaining cracked portion 13 can be opened and closed as an opening, it can be easily mounted around the pipe.

In the inorganic heat insulating material of the present invention 3, the sheet material is
A one-sided corrugated board formed of paper made of flame-retarded or non-combustible pulp, by being laminated with the core side facing the inorganic foam side, excellent in flame retardance or non-combustibility, and Excellent strength. In the inorganic heat insulating material of the present invention 4, the surface of the inorganic foam is protected by a stronger skin layer by providing a skin layer between the inorganic foam of the inorganic heat insulating material of the present inventions 1 to 3 and the sheet material. Thus, the inorganic heat insulating material of the present inventions 1 to 3 has more excellent strength.

In the method for producing an inorganic heat insulating material of the present invention 5, a sheet material is mounted in a mold, and an inorganic curable material and an inorganic foamable material containing a foaming agent as a main component are supplied into the mold to Foam the inorganic foamable material with one side of the inorganic foam,
By stacking the sheet materials, the sheet materials are charged with cations, so that the adhesiveness with the inorganic curable material charged with anions and the inorganic foamable material containing a foaming agent as a main component is excellent. Obtained by foaming, on at least one surface of the inorganic foam, the inorganic heat insulating material, in which the sheet material is laminated, is more adhesive than the one obtained by adhering the sheet material to the inorganic foam with an adhesive. Becomes stronger,
The bonding step can be omitted, and when the obtained inorganic heat insulating material is released from the mold, the sheet material is interposed between the inorganic foam material and the mold surface, so the mold release is easy. And
It is possible to easily manufacture an inorganic heat insulating material having excellent flame retardance or noncombustibility and excellent strength.

In the method for producing an inorganic heat insulating material of the present invention 6, a sheet material is mounted in a mold, and an inorganic curable material and an inorganic foamable material containing a foaming agent as a main component are fed into the mold, A sheet material is further mounted on the surface of the foamable material, the inorganic foamable material is foamed in the mold, and both sides of the inorganic foam are
By stacking the sheet materials, in addition to the effect of the present invention 5, an inorganic heat insulating material having high strength can be easily manufactured.

The method for producing an inorganic heat insulating material according to the present invention 7 is such that an inorganic foaming material is poured into the core side of a one-sided corrugated board made of paper made of flame-retarded or non-combustible pulp to foam and cure. This makes it possible to easily manufacture an inorganic heat insulating material having excellent flame retardancy or noncombustibility and excellent strength. That is, since the one-sided corrugated board is made of flame-retardant paper or non-combustible paper and charged with cations, it has excellent adhesiveness with an inorganic curable material charged with anions and an inorganic foamable material containing a foaming agent as a main component. In addition, the inorganic heat insulating material obtained by foaming the inorganic foaming material has stronger adhesion than that obtained by adhering one-sided corrugated board to the inorganic foam with an adhesive, and the adhering step can be omitted. In addition, when the obtained inorganic heat insulating material is released from the mold, the one-sided corrugated board is interposed between the inorganic foam material and the mold surface, so that the mold release is easy.

Moreover, since the core side of the one-sided corrugated board faces the side of the inorganic foamed body, a part of the inorganic foamed body enters between the waves of the centered core, and the adhesiveness between the inorganic foamed body and the one-sided corrugated board is further improved. It will be strong. The method for producing an inorganic foam according to the present invention 8 is a method in which a foaming agent is not added to one side of paper made of flame-retarded or non-combustible pulp or to the core side of one-sided corrugated board made of this paper. After the curable material is applied, the inorganic curable material with a foaming agent added to the inorganic curable material is further poured onto this coated surface to foam and cure, thereby forming an inorganic curable material and a foam that become a skin layer. Since the inorganic foaming material and the inorganic foaming material can be simultaneously cured, the adhesion becomes strong, the process can be simplified, and the inorganic heat insulating material of Invention 4 can be easily obtained.

The method for producing an inorganic foam of the present invention 9 comprises supplying a water repellent to the surface of the sheet of the inorganic heat insulating material of the present invention 1 to 4 and allowing the water repellent to penetrate into the inorganic foam. In addition to the action of the inorganic heat insulating material of the present inventions 1 to 4, an inorganic heat insulating material having high water repellency can be easily manufactured.

[0062]

EXAMPLES The present invention will be described below with reference to examples. (1) Inorganic foams A to D and A'to D'were prepared as follows. Inorganic foam A, A'Alumina- silica powder consisting of dust during the production of alumina-based abrasives
O ₂ 32% by weight, Al ₂ O ₃ 56% by weight, and a total of 12% by weight of other impurities, and 100 parts by weight of powder having a maximum particle size of 10 μm and an average particle size of 4.5 μm, mica (maximum particle size) 200 μm, average particle size 40 μm) 10 parts by weight, calcium stearate (manufactured by Wako Pure Chemical Industries, special grade reagent) 1 part by weight, and vinylon fiber (manufactured by Kuraray Co., Ltd., fiber diameter 14 μm, fiber length 2 mm) 1 part by weight, and hand The mixture was mixed using a mixer, and 67 parts by weight of a 50% aqueous solution of potassium silicate having SiO ₂ / K ₂ O = 2.5 was added thereto and mixed until a slurry was formed.

25% by weight of 10% aqueous hydrogen peroxide was further mixed with this slurry to prepare an inorganic foamable slurry a. This inorganic foamable slurry a is poured into a flat plate-shaped mold and a cylindrical mold, and left to stand at room temperature to foam.
After further standing for an hour, the temperature is kept at 80 ° C. for 3 hours to cure and dry, and then the mold is removed, and a flat inorganic foam A of 500 × 500 mm and a thickness of 15 mm and an inner diameter of 49 m
m, outer diameter 99 mm, length 1 m, cylindrical inorganic foam A
Got '

Inorganic foams B and B'Inorganic foaming slurry b was used except that 1 part by weight of aluminum powder (manufactured by Toyo Aluminum Co., Ltd., average particle size: 25 μm) was used in place of the hydrogen peroxide solution. In the same manner as the production of the foams A and A ′, a flat inorganic foam B having the same dimensions as the inorganic foams A and A ′ and a cylindrical inorganic foam B ′ were obtained.

50 parts by weight of fly ash (equivalent to JIS A-6201) to 100 parts by weight of inorganic foam C, C'ordinary Portland cement,
50 parts by weight of water, vinylon fiber (Kuraray, fiber diameter 14
μm, fiber length 2 mm) 1 part by weight, as a thickener, hydroxypropylmethyl cellulose (manufactured by Shin-Etsu Chemical Co., Ltd., trade name “Metroses 90SH-15000”) 0.5 parts by weight,
Calcium stearate (Wako Pure Chemical Industries, Ltd. special grade reagent) 1
A weight ratio is mixed with a hand mixer to form a slurry, and 0.5 part by weight of aluminum powder (manufactured by Toyo Aluminum Co., Ltd., average particle diameter 25 μm) as a foaming agent is further mixed into the inorganic foamable slurry c. Was produced.

This inorganic foamable slurry c was poured into a flat plate-shaped mold and a cylindrical mold and allowed to stand at room temperature to foam,
After left at room temperature for 1 hour, kept at 60 ° C for 10 hours to cure and dry, and then demolded, 500 x 500m
A flat inorganic foam C having a thickness of 15 mm and a thickness of 15 mm and a cylindrical inorganic foam C ′ having an inner diameter of 49 mm, an outer diameter of 99 mm and a length of 1 m were obtained.

100 parts by weight of inorganic foams D and D' water glass (JIS A-1408 sodium silicate No. 3 equivalent product), 100 parts by weight of silica stone powder (manufactured by Sumitomo Cement Co., average particle size: 15 μm), fluorinated silica 20 parts by weight of sodium (Wako Pure Chemical Industries, reagent grade 1), 1 part by weight of calcium stearate (Wako Pure Chemicals reagent grade),
Vinylon fiber (Kuraray Co., Ltd., fiber diameter 14 μm, fiber length 2
mm) 1 part by weight was mixed to form a slurry. In this, further, as a foaming agent, metallic silicon (Reagent 1 manufactured by Wako Pure Chemical Industries, Ltd.)
1 part by weight was mixed to prepare an inorganic foamable slurry d.

The inorganic foamable slurry d was poured into a flat plate-shaped mold and a cylindrical mold, kept at room temperature for 1 hour and then left at room temperature for 10 hours, and then kept at 100 ° C. for 10 hours to cure.
After drying, demolding, 500 × 500mm, thickness 15m
A flat inorganic foam D having a diameter of m and a cylindrical inorganic foam D ′ having an inner diameter of 49 mm, an outer diameter of 99 mm and a length of 1 m were obtained.

(2) The following sheet materials A to C were prepared or manufactured. Sheet material A GE paper (manufactured by Sumisho Steel Sales Co., Ltd., paper made by mixing NBKP (bleached softwood kraft pulp) with ammonium phosphate and glass fiber at a ratio of 1: 1). 12
0 g / m ² .

Sheet material B NBKP (softwood bleached kraft pulp) treated with ammonium phosphate and glass fiber mixed at a ratio of 4: 1 to make paper. 60 g / m ² . The sheet material C NUKP (softwood bleached kraft pulp) was disaggregated to a slurry concentration of 10% using a professional mixer (Matsushita Electric Co., Ltd., trade name "MX-150S"), and barium chloride and boric acid were added to each of 10 parts. It was added so as to be a weight% and stirred for 3 minutes to obtain a slurry.

Moisture content of this slurry is approximately 50% by weight
The solid content is added to an aqueous solution containing 10% by weight of ammonium phosphate and boric acid, and
Stir for minutes. Further, after washing this pulp with water, a slurry having a pulp concentration of 1% by weight is prepared and hand-made to obtain 200 g / m 2.
^The paper was made so that it had a weight of ^2, and was dehydrated under pressure with a rubber roll on a filter paper, and then dried to prepare a flame-retardant sheet material with barium phosphate.

(3) The following adhesives A to C were prepared. Adhesive A The same alumina-silica powder as used for inorganic foam A 1
A mixture of 67 parts by weight of the same potassium silicate aqueous solution as that used for the inorganic foam A with respect to 00 parts by weight. Adhesive B A mixture of 100 parts by weight of the same ordinary Portland cement used for the inorganic foam C, 50 parts by weight of the same silica stone powder as used for the inorganic foam D, and 40 parts by weight of water. Adhesive C Water glass as used for inorganic foam D.

Examples 1 to 4 The adhesive shown in Table 1 was applied to the front and back surfaces of the flat inorganic foam shown in Table 1 with a brush so that the thickness was about 0.5 mm. Place the sheet material shown in Table 1 on the
By suppressing the pressure with g / cm ² , a flat inorganic heat insulating material was obtained.

With respect to the obtained flat inorganic heat insulating material,
A bending strength test, an incombustible material test, a water repellency test, and a peeling test were performed. The results are shown in Table 1. The bending strength test and the water repellency test were performed according to JIS A-9510. The non-combustible material test was conducted according to the Ministry of Construction Notification No. 1828 of 1945. The peel test was evaluated by performing a flat surface tension test between the inorganic foam and the epidermis and observing the peel position.

Example 5 When the flat inorganic foam B was prepared, the sheet material B of the flat mold was placed, the slurry b made of the inorganic foam was poured on the sheet material B, and the sheet material B was placed thereon. Except for this, the flat inorganic heat insulating material in which the sheet material B was laminated on the front and back surfaces of the inorganic foam B was obtained in the same manner as in the production of the flat inorganic foam B. About the obtained flat inorganic heat insulating material,
A bending strength test, an incombustible material test, a water repellency test, and a peeling test were performed. The results are shown in Table 1.

Example 6 Instead of the sheet material A, a wax-based sizing agent (trade name "Size Pine W-226, manufactured by Arakawa Chemical Co., Ltd., was added to the sheet material A.
H ") to 20 g / m ² and spray 100
A flat plate-shaped inorganic heat insulating material was obtained in the same manner as in Example 1 except that the sheet material A ′ that was dried at 10 ° C. for 10 minutes and treated to be water-repellent was used. About the obtained flat inorganic heat insulating material,
A bending strength test, an incombustible material test, a water repellency test, and a peeling test were performed. The results are shown in Table 1.

Example 7 Instead of the sheet material A, an aqueous penetrating water absorption inhibitor (manufactured by Toyo Ink Co., Ltd., trade name "Tight Silane") was applied to the sheet material A with a brush so that the amount was 300 g / m ^2, and A flat plate-shaped inorganic heat retaining material was obtained in the same manner as in Example 1 except that the sheet material A ″ which was dried at 2 ° C. for 2 hours and treated to be water-repellent was used. A bending strength test, a noncombustible material test, a water repellency test, and a peeling test were performed on the obtained plate-shaped inorganic heat insulating material. The results are shown in Table 1.

Example 8 Instead of the sheet material A, an alkyl ketene dimer type sizing agent (manufactured by Arakawa Chemical Co., Ltd., trade name "Size Pine SPK-90" in the slurry at the time of paper making was used to produce the sheet material C.
1 ") was added so that the concentration was 0.2%, and a sheet material C'which was subjected to a water-repellent treatment was used to obtain a flat inorganic heat insulating material in the same manner as in Example 1. A bending strength test, a noncombustible material test, a water repellency test, and a peeling test were performed on the obtained plate-shaped inorganic heat insulating material. The results are shown in Table 1.

Example 9 On the surface of the plate-shaped inorganic heat insulating material obtained in Example 1, a solvent-type penetrating water-absorption inhibitor (manufactured by Shin-Etsu Chemical Co., Ltd., trade name "KP-84"
00 ") to 200 g / m ² and spray 6
It was dried at 0 ° C. for 2 hours to obtain a water-repellent flat inorganic heat insulating material. A bending strength test, a noncombustible material test, a water repellency test, and a peeling test were performed on the obtained plate-shaped inorganic heat insulating material. The results are shown in Table 1.

Example 10 Silicon oil (manufactured by Shin-Etsu Chemical Co., Ltd., trade name "KF96-50C" was applied to the surface of the flat inorganic heat insulating material obtained in Example 2.
S ") 100 parts by weight, water 90 parts by weight, surfactant 1 (manufactured by Kao Corporation, trade name" Reodol TW-S12 "
0 ") 5 parts by weight and 5 parts by weight of Surfactant 2 (manufactured by Kao Corporation, trade name" Reodol SP-S30 ") were sprayed at 600 g / m < ² > to give an emulsion of a water repellent agent. It was dried at 0 ° C. for 2 hours to obtain a water-repellent flat inorganic heat insulating material. A bending strength test, a noncombustible material test, a water repellency test, and a peeling test were performed on the obtained plate-shaped inorganic heat insulating material. The results are shown in Table 1.

Example 11 On the surface of the plate-like inorganic heat insulating material obtained in Example 3, a water-based penetrating water-absorption inhibitor (manufactured by Toyo Ink Co., Ltd., trade name "Tight Silane") was applied at 300 g / m ^2. Then, it was dried at 60 ° C. for 2 hours to obtain a flat inorganic heat insulating material that was subjected to a water repellent treatment by post treatment. A bending strength test, a noncombustible material test, a water repellency test, and a peeling test were performed on the obtained plate-shaped inorganic heat insulating material. The results are shown in Table 1.

Comparative Examples 1 to 4 The flat inorganic heat insulating materials A to D were subjected to the same bending strength and incombustible material tests as in Examples 1 to 4. The results are shown in Table 2.

Comparative Example 5 The same bending strength and noncombustible material tests as in Examples 1 to 4 were carried out on the commercially available JIS-compliant product heat insulating plate No. 1-13 calcium silicate plate. The results are shown in Table 2.

Comparative Examples 6 to 9 Examples other than using the sheets A _{0 to} C ₀ , which are made of the same materials as the sheet materials A to C and are not subjected to the flame retardant treatment, instead of the sheet materials A to C A flat inorganic heat insulating material was obtained in the same manner as in 1 to 4. This flat inorganic heat insulating material was subjected to the same bending strength and incombustible material tests as in Examples 1 to 4. The results are shown in Table 2.

[0085]

[Table 1]

[0086]

[Table 2]

As is clear from Tables 1 and 2, in the case of Examples 1 to 11 of the present invention, the obtained inorganic heat insulating materials are excellent in strength and flame retardancy or incombustibility. . Furthermore, when water-repellent treatment is performed as in Examples 6 to 11, the obtained inorganic heat insulating material has extremely excellent water repellency. On the other hand, in the cases of Comparative Examples 1 to 9, the obtained inorganic heat insulating material is inferior in strength or at least one of flame retardancy and noncombustibility.

Example 12 A cylindrical inorganic foam A'was divided into two pieces so as to form cracks in the longitudinal direction, and the adhesive A was applied to the inner and outer peripheral surfaces of the cylinder with a brush to a thickness of 0.5 mm. So that
The sheet material C was attached thereon, and the cylindrical inorganic heat insulating material as shown in FIG. 1 was obtained by the method according to Examples 1 to 4. The cylindrical inorganic heat insulating material thus obtained was subjected to a falling body test and a water repellency test similar to those in Examples 1 to 4. The results are shown in Table 3. In the drop test, the cylindrical inorganic heat insulating material was dropped in a horizontal state from a position of 1 m in height,
It was evaluated by observing the fractured state.

Embodiment 13 As shown in FIG. 3, a detachable half-cylinder-shaped lower frame 31, a half-cylinder-shaped upper frame 32 having a smaller radius of curvature than that, and a lower mold 31. It is composed of a side frame 33 that connects the ends of the upper frame 32, and has a half-cylindrical space 34 when assembled.
A mold 3 was prepared in which two of the above-mentioned ones were formed side by side.

The sheet material A is attached to the upper surfaces of the lower frames 31, 31 and the lower surfaces of the upper frames 32, 32 which are adjacent to each other in the mold 3 (the sheet material A extends between the lower molds 31, 31 and is locked). Mounted so as to project), in the space 34 of the mold 3,
The inorganic foamable slurry a is poured, left standing at room temperature for foaming, left for 1 hour, left at 80 ° C. for 3 hours to cure and dry, and then demolded, as shown in FIG. An inner diameter of 49 m in which the sheet material A is laminated on the outer peripheral surface of the inorganic foam A ″ and the locking portion of the sheet material A is projected.
A cylindrical inorganic heat insulating material having an m, an outer diameter of 99 mm and a length of 1 m was obtained. In addition, double-sided adhesive tape (made by Sekisui Chemical Co., Ltd.
20 mm width) was attached to form an adhesive layer. With respect to the cylindrical inorganic heat insulating material (closed state by the locking portion), the falling body test according to Example 12 and the water repellency test similar to Examples 1 to 4 were performed. The results are shown in Table 3.

Example 14 The sheet material C is attached to the upper surfaces of the lower frames 31 and 31 and the lower surfaces of the upper frames 32 and 32 which are adjacent to each other in the form 3 of FIG. 3 (sheet material C
Is mounted so that the lower molds 31 and 31 are straddled and the locking portions are projected), and the inorganic foamable slurry c is poured into the space 34 of the mold 3 in the same manner as in Example 12. As shown in FIG. 2, the sheet material C is laminated on the inner and outer peripheral surfaces of the inorganic foam C ″, and the locking portion of the sheet material C is projected to have an inner diameter of 49 mm, an outer diameter of 99 mm, and a length of 1 m. A cylindrical inorganic heat insulating material was obtained. A double-sided adhesive tape (manufactured by Sekisui Chemical Co., Ltd., 20 mm width) was attached to the locking portion to provide an adhesive layer. With respect to this cylindrical inorganic heat insulating material (closed by the locking portion), a falling body test according to Example 12,
And the same water repellency test as in Examples 1 to 4 was performed. The results are shown in Table 3.

Example 15 On the surface of the cylindrical inorganic heat insulating material obtained in Example 13,
A water repellent treatment by post-treatment was carried out in the same manner as in Example 9 to obtain a water repellent cylindrical inorganic heat insulating material. In addition, instead of the double-sided tape, an adhesive layer was formed in the locking portion using a butyl-based adhesive, and release paper was attached onto the adhesive layer. With respect to the cylindrical inorganic heat insulating material (closed state by the locking portion), the falling body test according to Example 12 and the water repellency test similar to Examples 1 to 4 were performed. The results are shown in Table 3.

Example 16 A water repellent treatment was conducted in the same manner as in Example 13 except that a sheet material A'which had been pretreated by a pretreatment in the same manner as in Example 6 was used in place of the sheet material A. A cylindrical inorganic heat insulating material was obtained. With respect to the cylindrical inorganic heat insulating material (closed state by the locking portion), the falling body test according to Example 12 and the water repellency test similar to Examples 1 to 4 were performed. The results are shown in Table 3.

Example 17 A sheet material C is attached to the upper surfaces of the lower frames 31 and 31 and the lower surfaces of the upper frames 32 and 32 which are adjacent to each other in the mold 3 of FIG. Mounted so as to project the locking portion), the inorganic foaming slurry d is poured into the space 34 of the mold 3 and left at room temperature to foam.
After further standing for 1 hour, holding at a temperature of 100 ° C. for 10 hours to cure and dry, and then demolding, as shown in FIG.
A sheet material C is laminated on the inner and outer peripheral surfaces of the inorganic foam D ″, and the inner diameter is 49 m in which the locking portion of the sheet material C is projected.
A cylindrical inorganic heat insulating material having an m, an outer diameter of 99 mm and a length of 1 m was obtained. Double-sided adhesive tape (Sekisui Chemical Co., Ltd., 20
(mm width) was attached to form an adhesive layer. This cylindrical inorganic heat insulating material was subjected to post-treatment water repellent treatment in the same manner as in Example 11. With respect to the cylindrical inorganic heat insulating material subjected to the water repellent treatment (closed by the locking portion), the falling body test according to Example 12 and the water repellent test similar to Examples 1 to 4 were performed. The results are shown in Table 3.

Comparative Examples 10 to 13 For cylindrical inorganic heat insulating materials A'to D ', Example 12
The same falling body test was performed. The results are shown in Table 4. Comparative Example 14 The same falling body test as in Example 12 was carried out on a commercially available JIS compliant heat retaining tube No. 1-13 calcium silicate heat retaining tube. The results are shown in Table 4.

[0096]

[Table 3]

[0097]

[Table 4]

As is clear from Tables 3 and 4, in the case of Examples 12 to 17 of the present invention, the drop resistance is excellent, whereas in the cases of Comparative Examples 10 to 14, the drop resistance is high. The fallen strength is inferior.

Example 18 Of the formulations shown in Table 5, the formulations except for the potassium silicate aqueous solution and the hydrogen peroxide solution were mixed, and then the potassium silicate aqueous solution was added and further mixed until a slurry was formed.
The mold to be molded has a shape as shown in FIG.
It has a structure of × 300 × 20 mm and a lid 51 on the upper surface, and an opening of 50 × 20 mm is provided at one side surface. The one-sided corrugated board 4 was installed in advance on the bottom surface of the mold 5 with the side of the core 41 facing upward.

6% 10% hydrogen peroxide solution was added to the above slurry.
6 parts by weight were added, and the mixture was further mixed for 20 seconds with a hand mixer. As shown in FIG. 6, the material 6 was poured into the mold 5 on which the corrugated board 4 was installed, and the lid 51 was attached. Foaming is about 5
It was completed after a minute, and after sealing, it was cured at 50 ° C. for 3 hours, and the seal was removed and dried at 50 ° C. for 3 hours to obtain the desired heat retaining material 7 as shown in FIG. 7. Then, the bending strength of the obtained heat insulating material 7 was measured by three-point bending with the corrugated board 4 facing downward so that a linear load was applied in a direction perpendicular to the mountain flow. The one-sided corrugated board 4 used was a 1: 1 mixture of a core 41 and a liner 42 made of NBKP (bleached softwood kraft pulp, GE paper manufactured by Sumisho Steel Sales Co., Ltd.) treated with ammonium phosphate and glass fiber. It is formed by using a sheet material (100 g / m ² ) made by papermaking, the height of the wave of the core 41 is 2.8 mm, and the number of waves is 50/3.
It was 0 cm.

The SiO ₂ --Al ₂ O powder used was dust produced during the production of the alumina abrasive and had a composition of SiO _2-.
32% by weight, Al ₂ O ₃ 56% by weight, and a total of 12% by weight of other impurities, maximum particle size 10 μm, average particle size 4.5
It was a powder of μm. Mica has a maximum particle size of 200 μm,
The average particle size was 40 μm. Calcium stearate was a special grade reagent manufactured by Wako Pure Chemical Industries. The vinylon fiber had a fiber diameter of 14 μm and a fiber length of 2 mm manufactured by Kuraray Co., Ltd. SiO ₂ —K ₂ O is SiO ₂ / K ₂ O =
It was a 50% aqueous solution of potassium silicate of 2.5.

Example 19 A heat insulating material 8 as shown in FIG. 7 was obtained in the same manner as in Example 18 except that the mold was a semi-cylinder having an outer diameter of 100 mm and an inner diameter of 50 mm, and a corrugated board was placed on the outer circumference. . The bending strength of the obtained heat insulating material 8 was measured by three-point bending with the circumferential part facing upward. Example 20 A target heat retaining material was obtained in the same manner as in Example 18, except that corrugated board was placed on both the bottom and top of the formwork so that the ridgelines of the waves were parallel to each other. The bending strength of this heat insulating material was measured in the same direction as in Example 18.

Example 21 Of the compounds shown in Table 5, compounds other than aluminum powder were mixed with a hand mixer to form a slurry, and then aluminum powder was further added to this slurry to obtain an inorganic foamable material. This inorganic foamable material was cast in the same manner as in Example 18 into a frame having a corrugated cardboard set on the bottom surface. The foaming was completed in about 10 minutes, and this was heat-cured at 60 ° C. for 12 hours and further dried at 60 ° C. for 6 hours to obtain a desired heat insulating material. The bending strength of this heat insulating material was measured in the same direction as in Example 18. In Table 5, HPMC represents hydroxypropyl methylcellulose.

Example 22 Of the formulations shown in Table 5, the formulations other than the hydrogen peroxide solution were mixed with a hand mixer to make a slurry, and then hydrogen peroxide solution was further added to this slurry to prepare an inorganic foamable material. Got This inorganic foamable material was cast in the same manner as in Example 18 into a frame having a corrugated cardboard set on the bottom surface. Foaming is 5
Completed in minutes, heated to 40 ° C. for 5 hours, Example 1
A heat insulating material was obtained in the same manner as in 8. The bending strength of this heat insulating material was measured in the same direction as in Example 1.

The silica stone powder having an average particle size of 15 μm manufactured by Sumitomo Cement Co., calcium stearate is a reagent special grade manufactured by Wako Pure Chemical Industries, and the vinylon fiber is 1 fiber diameter manufactured by Kuraray Co., Ltd.
4 μm, fiber length 2 mm, and hydrogen peroxide solution having a concentration of 10% were used.

[0106]

[Table 5]

The measurement results of the bending strength of the heat insulating material obtained in Examples 18 to 22 are shown in Table 6 together with the specific gravity of each heat insulating material.

[0108]

[Table 6]

Comparative Example 15 A heat insulating material was obtained in the same manner as in Example 18 except that the corrugated board was not set on the bottom surface. Then, the bending strength of this heat insulating material was measured. Comparative Example 16 A heat insulating material was prepared in the same manner as in Example 18 except that GE paper (manufactured by Sumisho Steel Sales Co., Ltd.) having the same basis weight (240 g / m ² ) as that of the corrugated board used in Example 18 was used instead of the corrugated board. Then, the bending strength was measured.

Comparative Example 17 A method similar to that of Example 19 except that GE paper (manufactured by Sumisho Steel Sales Co., Ltd.) having the same basis weight (240 g / m ² ) as that of the corrugated board used in Example 18 was used in place of the corrugated board. The heat insulating material was obtained in the above, and the bending strength was measured. Comparative Example 18 A heat insulating material was prepared in the same manner as in Example 20 except that GE paper (manufactured by Sumisho Steel Sales Co., Ltd.) having the same basis weight (240 g / m ² ) as the corrugated board used in Example 18 was used instead of the corrugated board. Then, the bending strength was measured.

Comparative Example 19 A method similar to that of Example 21 except that GE paper (manufactured by Sumisho Steel Sales Co., Ltd.) having the same basis weight (240 g / m ² ) as the corrugated board used in Example 18 was used in place of the corrugated board. The heat insulating material was obtained in the above, and the bending strength was measured. Comparative Example 20 A heat insulating material was prepared in the same manner as in Example 22 except that GE paper (manufactured by Sumisho Steel Sales Co., Ltd.) having the same basis weight (240 g / m ² ) as that of the corrugated board used in Example 18 was used instead of the corrugated board. Then, the bending strength was measured.

The measurement results of the bending strength of the heat insulating materials obtained in Comparative Examples 15 to 20 are shown in Table 7 together with the specific gravity of each heat insulating material.

[0113]

[Table 7]

As is clear from Tables 6 and 7, the bending strength is excellent in Examples 18 to 22 of the present invention, while the bending strength is excellent in Comparative Examples 15 to 20. Is inferior.

Example 23 Of the formulations shown in Table 8, the potassium silicate aqueous solution and the formulation excluding the hydrogen peroxide solution were mixed, and then the potassium silicate aqueous solution was added and further mixed until a slurry was formed.
The sheet material A was previously set on the bottom surface of the mold and the lid, and the above-mentioned slurry was applied with a brush so that the thickness was 0.3 mm. The formwork has a size of 300 ×, as shown in FIG.
It has a structure of 300 × 20 mm and a lid on the upper surface, and an opening of 50 × 20 mm is provided on one side surface.

Further, 6 parts by weight of 10% hydrogen peroxide solution was added to the above-mentioned slurry and further mixed for 20 seconds with a hand mixer to obtain an inorganic foamable material. This inorganic foamable material was poured into a mold provided with the sheet material A coated with the above-mentioned skin layer slurry, and a lid was attached. Foaming is complete after about 5 minutes, sealed and cured at 50 ° C for 3 hours,
Further, the seal was removed and the product was dried at 50 ° C. for 3 hours to obtain a desired heat insulating material. The SiO ₂ —Al ₂ O-based powder used was dust during the production of the alumina-based abrasive and had a composition of Si.
O ₂ 32% by weight, Al ₂ O ₃ 56% by weight, and a total of 12% by weight of other impurities, the powder had a maximum particle size of 10 μm and an average particle size of 4.5 μm. Mica has a maximum particle size of 200
The average particle size was 40 μm. Calcium stearate was a special grade reagent manufactured by Wako Pure Chemical Industries. The vinylon fiber had a fiber diameter of 14 μm and a fiber length of 2 mm manufactured by Kuraray Co., Ltd. SiO ₂ -K ₂ O is, SiO ₂ / K ₂ O
= 2.5% aqueous solution of potassium silicate.

Example 24 A target heat retaining material was obtained in the same manner as in Example 23 except that the slurry had a thickness of 1.5 mm and was coated with a roll coater instead of a brush. Example 25 A target heat retaining material was obtained in the same manner as in Example 23, except that the compounding ratios of the materials in Table 25 were separately prepared as shown in Table 8.

[0118]

[Table 8]

Example 26 As shown in Table 9, the intended heat retaining material was obtained in the same manner as in Example 23 except that the mixing ratio of the hydrogen peroxide solution and the SiO ₂ —K ₂ O aqueous solution was changed. Example 27 As shown in Table 9, the target heat retaining material was obtained in the same manner as in Example 23 except that the sheet material C was used instead of the skin.

[0120]

[Table 9]

Example 28 Of the formulations shown in Table 10, components other than aluminum powder were mixed with a hand mixer, the resulting slurry was applied as a skin layer in the same manner as in Example 23, and aluminum powder was further added to the slurry to form a mold. Cast into. Foaming was completed after about 10 minutes, and it was cured by moist heat at 60 ° C for 12 hours, and further 60 ° C.
And dried for 6 hours to obtain the desired heat insulating material.

Example 29 20 parts by weight of sodium silicofluoride, 100 parts by weight of silica stone powder (Sumitomo Cement Co., Ltd., average particle size: 15 μm), calcium stearate (Wako Pure Chemicals Reagent, based on 100 parts by weight of No. 3 sodium silicate) ) 1 part by weight and 1 part by weight of vinylon fiber (manufactured by Kuraray Co., Ltd., fiber diameter 14 μm, fiber length 2 mm) were mixed to form a slurry. 6% by weight of 10% hydrogen peroxide solution was added thereto, and this slurry was cast into a mold set with a stainless steel plate in the same manner as in Example 1. The foaming was completed after 5 minutes, and this was heated at 40 ° C. for 5 hours to obtain a heat insulating material.

[0123]

[Table 10]

Comparative Example 21 Using the inorganic foamable material of Example 23, a heat retaining material containing only an inorganic foam was obtained. Comparative Example 22 A heat insulating material was obtained in the same manner as in Example 23 except that the skin layer was not provided. Comparative Example 23 Example 2 except that the sheet material A was not provided as the skin.
A heat insulating material was obtained in the same manner as in 3.

Comparative Example 24 A heat insulating material was obtained in the same manner as in Example 26 except that the skin layer was not provided. Comparative Example 25 A heat insulating material was obtained in the same manner as in Example 27 except that the skin layer was not provided. Comparative Example 26 A heat insulating material was obtained in the same manner as in Example 28 except that the skin layer was not provided.

Comparative Example 27 Example 2 except that the sheet material A was not provided as a skin.
A heat insulating material was obtained in the same manner as in 8. Comparative Example 28 A heat insulating material was obtained in the same manner as in Example 29 except that the skin layer was not provided.

Comparative Example 29 Example 2 except that the sheet material A was not provided as a skin.
A heat insulating material was obtained in the same manner as in 9. While measuring the density and bending strength of the heat insulating material obtained in Examples 23 to 29 and Comparative Examples 21 to 29, the heat insulating material was dropped horizontally from a height of 1.5 m, and the broken state of the heat insulating material at this time was visually observed. The results are shown in Table 11.

[0128]

[Table 11]

As is clear from Table 11, in the case of Examples 23 to 29 of the present invention, the bending strength was excellent, and the results of the falling body test showed no abnormality.
In Comparative Examples 21 to 29, the bending strength was inferior, and as a result of the falling body test, the pieces were disjointed or severely damaged.

[0130]

Since the inorganic heat insulating material of the present invention 1 has the above-mentioned constitution, it is excellent in flame retardancy or incombustibility.
Moreover, it has excellent strength. Since the inorganic heat insulating material of the second aspect of the present invention is configured as described above, it is excellent in flame retardancy or incombustibility and strength, and can be easily mounted around the pipe.

Since the inorganic heat insulating material of the present invention 3 has the above-mentioned constitution, it is excellent in flame retardancy or incombustibility and is excellent in strength. Since the inorganic heat insulating material of the present invention 4 is configured as described above, it is excellent in flame retardance or noncombustibility, and since the skin layer is provided on the surface of the foam, the rigidity of the surface of the inorganic foam is improved. It is possible to improve the strength of the inorganic heat insulating material of the present inventions 1 to 3.

Since the method for producing an inorganic heat insulating material of the present inventions 5 to 8 has the above-mentioned constitution, the sheet material is strongly adhered to the surface of the inorganic foam, and the adhering step is omitted. In addition, it is easy to release the mold, and it is possible to easily manufacture an inorganic heat insulating material having excellent flame retardancy or noncombustibility and strength. Since the method for producing an inorganic heat insulating material of the present invention 9 is configured as described above, it is possible to easily produce an inorganic heat insulating material that is excellent in flame retardancy or incombustibility and strength and is excellent in water repellency. .

[Brief description of drawings]

FIG. 1 is a plan view showing an example of an inorganic heat insulating material of the present invention 2. FIG.

FIG. 2 is a plan view showing another example of the inorganic heat insulating material of the present invention 2.

FIG. 3 is a cross-sectional view showing a mold for producing the inorganic heat insulating material of the present invention 2.

FIG. 4 is a sectional view showing an example of a one-sided cardboard used in the present invention 3.

FIG. 5 is a cross-sectional view showing another example of the one-sided cardboard used in the present invention 3.

FIG. 6 is a cross-sectional view showing a mold for producing the inorganic heat insulating material of the present invention 3.

FIG. 7 is a sectional view showing an example of an inorganic heat insulating material of the present invention 3.

FIG. 8 is a sectional view showing another example of the inorganic heat insulating material of the present invention 3.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inorganic foam 2 Sheet material 4 Cardboard on one side 6 Inorganic foaming material 7,8 Heat insulating material 11, 12 Half-split piece 13, 14 Split 21 Locking piece 22 Adhesive layer 41 Middle core

Claims (9)

[Claims] 1. An inorganic heat insulating material, characterized in that a sheet material is laminated on at least one surface of an inorganic foam, and the sheet material is a paper made of flame-retarded or incombustible pulp. 2. The sheet material according to claim 1, wherein one portion of the crack is left on the outer peripheral surface of the tubular inorganic foam body which is divided into at least two pieces so as to form a crack in the longitudinal direction. An inorganic heat insulating material that is characterized by 3. The sheet material is a one-sided corrugated board made of paper made of flame-retarded or non-combustible pulp, and is laminated with its core side facing the inorganic foam side. The inorganic heat insulating material according to claim 1 or 2. 4. The inorganic heat insulating material according to claim 1, wherein a skin layer made of an inorganic cured body having a higher specific gravity than that of the inorganic foam layer is laminated between the inorganic foam and the sheet material. 5. In obtaining the inorganic heat insulating material according to any one of claims 1 to 3, after mounting a sheet material in a mold, an inorganic curable material and an inorganic material containing a foaming agent as a main component in the mold. A method for producing an inorganic heat insulating material, comprising supplying an expandable material, foaming the inorganic expandable material in a mold, and laminating the sheet material on one surface of the inorganic foam. 6. In obtaining the inorganic heat insulating material according to any one of claims 1 to 3, after a sheet material is mounted in a mold, an inorganic curable material and a foaming agent are mainly contained in the mold. Supplying a foamable material, further mounting a sheet material on the inorganic foamable material, then foaming the inorganic foamable material in a mold, and laminating the sheet material on both sides of the inorganic foamed body. A method for producing an inorganic heat insulating material, comprising: 7. In obtaining the inorganic heat insulating material according to claim 3, the sheet material is a one-sided corrugated board made of paper made of pulp which is flame-retardant or non-combustible.
A method for producing an inorganic heat insulating material, which comprises placing a sheet material in a mold, and then pouring an inorganic foaming material into the core of a corrugated board to foam and cure the material. 8. To obtain the inorganic heat insulating material according to claim 4, after a sheet material is mounted in a mold, an inorganic curable material to which a foaming agent has not been added is applied to the sheet material, and then the coated surface is applied. Furthermore, a method for producing an inorganic heat insulating material, which comprises pouring an inorganic foamable material having a foaming agent added to the inorganic curable material to foam and cure the material. 9. An inorganic heat-insulating material, characterized in that a water-repellent agent is supplied to the surface of a sheet material of the inorganic heat-insulating material according to any one of claims 1 to 4, and the water-repellent agent is allowed to penetrate into the inside of the inorganic foam. Method of manufacturing wood.