JPS5845505B2 - Manufacturing method for sheet-shaped architectural interior materials - Google Patents

Description

Detailed Description of the Invention The present invention contains a large amount of inorganic powder that does not harden by reacting with water (hereinafter referred to as non-hydraulic), uses a water-soluble polymer as a binder, and further contains a crosslinking agent. The present invention relates to a method for manufacturing a sheet-like building interior material made insoluble in water by crosslinking a binder.

More specifically, it contains a non-hydraulic inorganic powder such as gypsum trihydrate, a water-soluble polymer such as a polyvinyl alcohol polymer, and its crosslinking agent as essential components, and if necessary, a blowing agent, an air entraining agent, and a reinforcing agent. A sheet characterized by forming an inorganic powder slurry to which additives such as materials, pigments, plasticizers, etc. are added, forming this into a sheet shape, drying it, and further subjecting it to water insolubilization treatment as necessary. This relates to a manufacturing method for architectural interior materials, and its purpose is to have excellent water resistance, flame retardancy, flexibility, and dew condensation resistance, as well as workability such as embossing, heat insulation, and vibration isolation. To provide a sheet-shaped architectural interior material suitable for use as a wall covering material, a ceiling material, a flooring material, a furniture covering material, etc., or an interior material for automobiles, etc., which has excellent properties.

Traditionally, the interior of Japanese houses has been plastered with inorganic materials such as plaster or sand walls, but due to demands for diversification of design and construction costs, various interior materials have come to be used. Ta.

Typical examples are vinyl chloride resin sheets, wallpaper and decorative plywood made from fabrics, non-woven fabrics, processed paper, etc. Recently, there has been a strong demand for these interior materials to be made non-combustible due to their flammability. It's coming.

Gypsum boats, asbestos, slate boards, etc. can meet the requirements in terms of noncombustibility, but it is difficult to predict whether they can be used as interior materials, and they are used as part of ceiling materials.

In addition to being non-combustible, architectural interior materials have many properties such as water resistance, condensation resistance, abrasion resistance, bending resistance, impact resistance, adhesion, stain resistance, sound absorption, heat insulation, feel, color, etc. However, a material that can satisfy all of these requirements has not yet been developed.

The present inventors have conducted intensive research in order to improve the flame retardancy of conventionally used wallpapers, decorative plywood, etc., and to develop multifunctional materials suitable for architectural interior materials that can satisfy the above-mentioned requirements. As a result of stacking, a slurry containing non-hydraulic inorganic powder, a water-soluble polymer, and its crosslinking agent as essential components, and other additives as necessary, is formed into a sheet shape, dried, and then dried. The present inventors have discovered that a sheet-like building interior material obtained by applying water insolubilization treatment according to the invention has the desired multifunctionality, and has completed the present invention.

In other words, in the past, flame retardants containing halogens, etc. have been added to improve the flame retardancy of building interior materials, but none of them have been satisfactory in terms of the generation of toxic gas in the event of a fire and the non-combustibility effect. Essentially, it is necessary to contain a large amount of nonflammable inorganic material or to contain an appropriate amount of water.

However, it is very difficult to solidify and mold a sufficient amount of inorganic powder to impart nonflammability with only a small amount of organic material as a binder, and after dissolving the binder in an appropriate solvent and adding a large amount of inorganic powder, An effective method is to make a slurry, form it into a sheet, and then remove the solvent by drying or the like.

The solvent used for such dry moldability is most preferably water rather than organic solvents from the viewpoint of working environment, recovery process, fire prevention, etc. Therefore, as a binder, it is convenient to use a water-soluble polymer or a polymer in the form of an emulsion. is good.

However, molded products using such water-soluble polymers or emulsion-like polymers as binders tend to dissolve again when they come into contact with water, resulting in no shape retention, and they are also extremely sensitive to humidity and have poor dimensional stability. .

In order to improve this drawback, the present invention adds a water-soluble polymeric crosslinking agent used as a binder, and after adding non-hydraulic inorganic powder, slurry preparation, molding, drying, and heat treatment as necessary. In the water insolubilization treatment step, a crosslinking reaction is caused to make the water-soluble polymer used as a binder insolubilized in water, while at the same time retaining a large amount of non-hydraulic inorganic powder. It was discovered that it can impart excellent water resistance to objects without becoming insoluble or swelling when they come into contact with water.Furthermore, it also provides anti-condensation properties due to the flexibility of the resin itself and the hydrophilic nature of the resin. It is also possible to maintain the flame retardancy exhibited by containing a large amount of carbonaceous and inorganic powder.

On the other hand, conventionally, water-soluble polymers, emulsions, latex, etc. are added to water slurry of hydraulic gypsum or hydraulic cement to improve the water resistance and strength of the resulting gypsum board, cement concrete, and cement mortar moldings. The technology is well known.

The present invention is essentially different from such a method for producing a hydraulic inorganic molded product; when a hydraulic inorganic powder is used, the resulting sheet-like product loses its flexibility and is not suitable for the intended architectural use. It cannot be used for interior materials such as

It is an essential condition that the inorganic powder used in the present invention does not harden by reacting with water, and is added for the purpose of imparting nonflammability, weight feel, weight increase, moldability, designability, etc.

Examples of water-soluble polymers used in the present invention include polyvinyl alcohol polymers, polyvinylpyrrolidone,
Polyvinyl methyl ether, polyvinyl acrylamide, sodium polyacrylate, polyethylene oxide,
Polyethyleneimine, carboxymethylcellulose, hydroxyethylcellulose, methylcellulose, sodium alginate, casein, glue, dextrin, starch,
Examples include alpha starch, hydroxyethyl starch, gum arabic, gum tragacanth, and the like.

Among these, it is most preferable to use a polyvinyl alcohol polymer as the binder in view of moldability, water resistance, flexibility, anti-condensation properties, etc. of the sheet-like material obtained, when the sheet material is intended for use as a sheet-like building interior material.

The polyvinyl alcohol polymer used in the present invention is generally a polymer obtained by saponifying polyvinyl acetate and its various copolymers, or a polymer obtained by graft polymerizing various monomers to polyvinyl alcohol. can be,
Usually, the degree of polymerization is used within the range of 500 to 3,500.

The water-soluble polymer can be any of those normally used in textile processing, paper processing, pigment binders, emulsifying dispersants, adhesives, etc., but it is required that it be water-soluble or dispersible in water. , and a hole with a suitable crosslinking agent,
It is required that it can be made insoluble in water by performing treatments such as heating, drying, and changing pH as necessary.

A crosslinking agent added to improve the water resistance, strength, etc. of a sheet-like architectural interior material using a water-soluble polymer as a binder reacts with the functional group of the water-soluble polymer to cause intermolecular crosslinking, Any material can be used as long as it is insolubilized in water, but it is preferable that it is soluble or dispersible in water, and more preferably that it can maintain fluidity to the extent that it can be molded into a sheet in a slurry state.

Examples of crosslinking agents that can be used in the present invention include divalent or higher metal compounds such as calcium chloride for sodium alginate, metal salts for methyl cellulose and sodium polyacrylate, and polyacrylic acid for polyethylene oxide. Examples include acids.

Examples of crosslinking agents for polyvinyl alcohol polymers include glyoxal, terephthalaldehyde, glitaraldehyde, acetalyl disulfide, dialdehyde starch, dialdehydes such as double-terminal aldehyde polyvinyl alcohol, side chain aldehyde polyvinyl alcohol, and polyacrolein. those that cause an acetalization reaction, N-methylol urea, N-methylol melamine,
N-methylol compounds such as N-methylolethylene urea and N-methylol acrylamide, divinyl sulfone,
Bishydroxyethyl sulfone, disodium tris(
P-sulfoethyl)phosphonium salts, activated vinyl compounds such as N,N'-methylenebisacrylamide, compounds using etherification reactions by ring-opening reactions such as epichlorohydrin, dicarboxylic acids, dicarboxylic acid chlorides, acid anhydrides, diesters, and molecules Two or more carboxylic acid groups or dicarboxylic acid chloride groups in the chain.

Compounds with acid anhydrides, ester groups, etc. as side chains (e.g. polyacrylic acid, maleic anhydride copolymers, etc.),
CuyB can form complex compounds with polyvinyl alcohol polymers typified by polyvalent isocyanates, boric acid, borax, titanyl sulfate, potassium titanium oxalate, zirconium acid chloride, etc.

Metal compounds such as AI, Ti, Zr, Sn, V, Cr, Si, and Zn can be mentioned.

In particular, when the sheet material is intended to be used as a sheet-like building interior material in terms of moldability, water resistance, flexibility, dew-proofing properties, etc., complexes with the polyvinyl alcohol polymer are used as a crosslinking agent for the polyvinyl alcohol polymer. It is most preferred to use metal compounds capable of forming compounds.

The amount of crosslinking agent added may be any amount that can sufficiently improve water resistance through appropriate heat treatment.

In addition, plasticizers used as necessary in the present invention are added in order to further develop the flexibility of the molded sheet, and typical examples thereof include ethylene glycol, glycerin, trimethylene glycol, diethylene glycol, and tetramethylene. Polyhydric alcohols such as glycol, propylene glycol, 1,3-phthanediol, pentamethylene glycol, triethylene glycol, hexamethylene glycol, and esterified products, etherified products, and Michael-type products of these polyhydric alcohols You can give ID items, etc.

The amount of these plasticizers added should be the minimum amount necessary to achieve the desired flexibility; adding too much will cause problems in blocking resistance, stain resistance, water resistance, strength, etc. cause problems.

Examples of inorganic powders that do not harden due to reaction with water used in the present invention include gypsum trihydrate, calcium carbonate, borax, silica powder, kaolin, fluoride, talc, and aluminum hydroxide. Sansui is a non-hydraulic inorganic powder that satisfies the above-mentioned conditions for a multifunctional material, such as moldability, flame retardant effect, color tone, and flexibility of the resulting sheet-like building interior material. Plaster is the most suitable.

As the trihydrate gypsum, for example, naturally occurring gypsum, phosphoric acid by-product gypsum, titanium by-product gypsum, flue gas desulfurization by-product gypsum, etc. can be used.

Furthermore, instead of these non-hydraulic inorganic powders, lightweight aggregates such as pearlite, shirasu barene, hollow glass spheres, etc. can also be used.

Furthermore, these may be attached as needed, such as vinylon,
Organic fibers such as nylon, inorganic fibers such as glass fiber, asbestos, and rock wool, plate-like materials such as mica, and cloth-like materials such as glass paper, glass mat, glass cloth, asbestos paper, cheesecloth, gauze, nonwoven fabric, and paper. It is also possible to use substances as reinforcing agents, as well as coloring agents such as various dyes and pigments, anti-causing agents, sizing agents, air-entraining agents, sizing agents, and thickening agents.

The blending ratio of the non-water-resistant powder and the water-soluble polymer used in the present invention can be changed depending on the use and purpose of the obtained sheet-like architectural interior material. It will improve, but it will become less flexible.

Regarding water-soluble polymers containing approximately 6 to 20% by weight of the solid content of sheet-like molded products, Ministry of Construction Notification No. 1828 and 3417
It is possible to provide a sheet-shaped architectural interior material that passes the surface test and base material test specified in the No. 2003-1 and has good flexibility, but if it is less than about 6% by weight, it becomes inflexible and brittle. comes out.

On the other hand, those containing approximately 20% by weight or more of water-soluble polymers showed flame retardancy equivalent to semi-nonflammable in the aforementioned combustion test, and had very good flexibility, handleability, and feel, and also improved vibration damping properties. It is suitable as a general interior material.

The method for manufacturing a sheet-like architectural interior material according to the present invention involves first adding a water-soluble polymer at an appropriate concentration, an appropriate amount of a crosslinking agent, an amount of water required for moldability, a plasticizer, a pigment, and a foaming agent as necessary. An air-entraining agent, a thickener such as polyvinyl alcohol for improving moldability, and the like are added and mixed and stirred.

Next, while continuing stirring, an appropriate amount of non-hydraulic inorganic powder having an appropriate particle size and particle size distribution is gradually added to prepare a stock slurry.

If necessary, various reinforcing materials are added at this stage.

Furthermore, if the crosslinking reaction proceeds rapidly, it is necessary to add a crosslinking agent at the end.

It may be necessary to further add water in order to adjust the moldability of the slurry after adding the inorganic powder.

After defoaming or foam regulation, the slurry is formed into a sheet.

Examples of the molding method include an extrusion method, a coating method, a dipping method, etc., and molding can be performed using any of these methods.

The extrusion method is a method in which the slurry, which has a relatively high viscosity, is extruded from an extruder through a nozzle into a sheet with a thickness of 0.5 to 5 mm, placed on a rotating heating drum, etc., and if necessary, hot air is further sent to dry it. Yes, it is easy to dry.

The coating method is a method in which the relatively low-viscosity slurry is applied onto a film or belt through a doctor blade or the like having a certain gap, and the film or belt is sent to a dryer while being placed on the film or belt.

The coating method dries on one side and has a slow drying speed, but if the linear slurry is coated directly onto the fabric reinforcement instead of a film or belt, drying becomes faster.

In the dipping method, a continuous cloth-like reinforcing material is dipped into the slurry, the slurry is applied to both sides of the cloth-like reinforcing material, and then a roller or a spatula-like blade is used to roll the slurry into an appropriate sheet thickness. By scraping off the material and drying it, it is possible to insert a cloth-like reinforcing material inside the sheet-like molded product.

Double-sided drying speeds up the drying speed.

Furthermore, if necessary, it is also possible to perform a water insolubilization treatment to improve the water resistance of the sheet formed by the method described above.

Examples of water insolubilization treatments include heat-treating a sufficiently dried sheet-like molded product using a hot roller hot plate, heating chamber, etc., dipping the sheet-like molded product into an acidic or alkaline liquid, or dipping the sheet-like molded product into an acidic or alkaline liquid. There are PH treatment methods in which a sheet-like molded product is sprayed, but a heat treatment method is also an effective method for promoting crystallization of water-soluble polymers.

In addition, it is necessary to adjust the thickness of the sheet material by passing it between rollers before or after water insolubilization treatment to make it uniform.
At this point, the surface can also be embossed if desired.

Depending on the purpose for which the sheet-shaped architectural interior material of the present invention is used, a foamed sheet with a light specific gravity may be preferable.

In order to obtain a foam type sheet, there is essentially no difference from the production method described above, but by adding an air entraining agent or a foaming agent, it is also possible to produce a highly foamed sheet with a specific gravity of about 0.1.

A-1 To produce foaming by the air entrainment method, for example, an air entraining agent such as a 7-ion surfactant such as polyvinyl alcohol, potassium oleate, or polyethylene glycol monolaurate is added to the slurry. 10
If the amount of addition (770 parts by weight) is sufficient, stable and minute air bubbles can be added.

Microscopic air bubbles introduced by air entrainment are molded, dried,
It is stable even after undergoing a water insolubilization step, and the specific gravity of the foamed sheet can be adjusted by adjusting the amount of air entraining agent added and the stirring conditions of the slurry.

Next, when foaming is performed using a foaming agent, an evaporative foaming agent such as ethanol, or a foaming agent such as sodium bicarbonate, ammonium carbonate, azobisisophthyronitrile,
Any decomposable blowing agent such as para-toluenesulfonyl hydrazide can be used.

A foaming agent is added to the slurry in an amount of 0.1 to 10 parts by weight, and the slurry is subjected to molding, drying, and water insolubilization steps in exactly the same manner as in the above production method, so that a foamed structure is developed in the drying or water insolubilization step.

In order to make foaming effective, a foaming agent with an appropriate evaporation or decomposition temperature that matches the conditions of the drying and water insolubilization process should be selected, and the specific gravity of the foaming/wrapping sheet depends on the type of foaming agent and its addition. It can be adjusted by adjusting the amount and drying/heat treatment conditions.

The resulting sheet-like building interior material is flexible and pliable, and has excellent tensile, bending, and scratch strength, as well as abrasion resistance and processability. It can also be embossed and has an excellent appearance. can be granted.

It is also possible to roll up long rolls, such as metal plates, gypsum boards,
It can be bonded to plywood, plastered walls, etc. using a suitable adhesive or solvent such as toluene, or by thermocompression bonding with thermoplastic resin sandwiched therebetween.

The plate-like object to which the sheet-like object is glued can be cut into one piece, or
It is also possible to bend the sheet material, and when used as an interior material, it has excellent dew condensation resistance because it has the effect of absorbing and releasing indoor moisture, but as a binder. Since the water-soluble polymer used is cross-linked and becomes water-insoluble, there is no dimensional change due to moisture absorption, and no peeling occurs.

Since the sheet-like material contains a large amount of inorganic powder and an appropriate amount of water, it has excellent flame retardancy, and will not catch fire even if a cigarette is lit, for example.

In addition, when noncombustible plate-like materials such as steel plates, asbestos slates, and gypsum boards are composited, they have sufficient performance to pass as noncombustible materials.

In addition, since the surface of the sheet-like material is smooth, it is difficult to get dirty.
In addition, although it is easy to remove dirt, it also has the ability to absorb moisture, so it may become stained with ink.

For such uses, water permeability can be prevented by further treating the surface with a water repellent.

Even in this case, water vapor still passes through, so the anti-condensation properties are not impaired.

In this way, the sheet-like product obtained by the present invention can be used for ceilings,
It is a multifunctional material that satisfies all of the various properties widely required for interior materials for walls, floors, etc., and is suitable not only for a wide range of architectural interior materials, but also as furniture cladding and interior interior materials for automobiles, etc. be.

Furthermore, it can be used as a vibration isolating material and various types of heat insulating materials that can be attached to the housings of room coolers and motors.

EXAMPLES Hereinafter, the present invention will be specifically explained with reference to Examples, but the present invention is not limited to these Examples in any way.

In the examples, all "parts" mean parts by weight unless otherwise specified.

Example 1 Degree of polymerization: 2000. Partially saponified polyvinyl alcohol with saponification degree of 80 mol% (manufactured by Kuraray, Kuraray Bobal 420)
655 parts of a 15% by weight aqueous solution of isobutyne-maleic anhydride alternating copolymer (manufactured by Kuraray, Kuraray Isoban 04) 2
4.4 parts of a 25% by weight aqueous solution of isobutyne-maleic anhydride copolymer prepared by mixing and heating and dissolving 5.0 parts of sodium hydroxide, 58 parts of sodium hydroxide and 69.2 parts of water, and 1.4 parts of a 4N phosphoric acid aqueous solution.
7 parts of glycerin and 1.1 parts of glycerin were mixed with 88.0 parts of trihydrate gypsum, which was a by-product from the flue gas desulfurization process, after being dried and passed through a 32-mesh sieve, and mixed with stirring to form a slurry. Obtained.

This slurry was poured onto a glass plate covered with a polyethylene film and air-dried indoors to obtain a sheet with a thickness of 1.5 mm.

This sheet was heat-treated at 150° C. for 15 minutes to obtain a sheet-shaped building interior material containing 88% by weight of gypsum trihydrate, and various physical properties shown in Table 1 were measured.

Among the physical properties shown in Table 1, water retention is the water content determined by soaking a dry sample in water for 24 hours, then taking it out and measuring its weight, expressed as a percentage of the weight of the original sample. This value is a parameter of water resistance and dew condensation resistance, and is preferably 30 to 100% for interior materials.

The flammability test results were obtained by pasting a sheet sample onto a galvanized iron plate with a thickness of 0.6 mm using an epoxy resin adhesive. This is the result of a test, and bending workability refers to the degree of cracking in a sheet bonded to a steel plate when the plate is placed on a metal surface plate with sharp corners and bent inward and outward at a 90° angle. This shows the results of observing the condition.
Those with cracks were termed as defective, and those with no cracks were termed as good.

This is an evaluation of the processing performance as an interior material for heat-insulating folded steel plates, etc.

Condensation resistance means pasting a sheet sample on the outside of a crow aquarium with double-sided adhesive tape, placing it in a room at a room temperature of 20 degrees Celsius and relative humidity 65%, and placing it in a room with 00C ice water in the aquarium for up to 5 hours. This is the result of observing the state of water droplets adhering to the surface of a sheet-like sample and the state of bleeding of letters written with water-based ink on the surface.
A case where M5 was not observed was expressed as good, and a case where even a small amount of water droplets was attached was expressed as poor.

Peeling off commercially available vinyl chloride wallpaper and plaster walls: 1.5
The product cut out to a thickness of 1 mm was recognized as defective in the water condensation test.

As is clear from the results shown in Table 1, the sheet material obtained by the present invention is highly flexible, has excellent bendability and water resistance, has good dew condensation resistance, and is recognized as a noncombustible material. Therefore, it is suitable as a sheet-shaped architectural interior material.

Example 2 Partially saponified polyvinyl alcohol with polymerization of 117oo and degree of saponification of 88 mol% (manufactured by Kuraray, Kuraray Bobal 217)
88.0 parts of gypsum trihydrate, a by-product of flue gas desulfurization, was added to a mixed solution consisting of 53.3 parts of a 15% by weight aqueous solution of 1.0 parts of glycerin and 1.0 parts of glycerin, and the mixture was stirred and mixed to obtain a slurry.

Furthermore, 6.0 parts of a 50% by weight dioctyl phthalate solution (Millionate MR, manufactured by Nippon Polyurethane) of approximately 2.5-functional crude diphenylmethane diisocyanate was added to the slurry, stirred and mixed, and then quickly poured onto an ethylene terephthalate film. did.

Next, dry at 70°C for 30 minutes and then dry at 120°C.
The mixture was heat-treated for 10 minutes to obtain a sheet-shaped building interior material containing 88% by weight of gypsum trihydrate.

Table 1 shows various physical properties of this sample.

This sheet-like material is highly flexible, has excellent bendability and water resistance, has good anti-corporeal properties, and is recognized as a noncombustible material, so it is suitable as a sheet-like building interior material.

Example 3 10% by weight of fully saponified polyvinyl alcohol with a degree of polymerization of 1700 (manufactured by Kuraray, Kuraray Bobal 1], 7)
88 parts of gypsum trihydrate, a by-product of flue gas desulfurization, was added to a mixed solution consisting of 109 parts of an aqueous solution and 11 parts of glycerin, and the mixture was stirred and mixed to obtain a slurry.

Furthermore, a 5% by weight solution of natanyl sulfate (TiO804) obtained by heating a liquid consisting of 1 part of titanium oxide, 2 parts of sulfuric acid, and 4.5 parts of water to 350 to 400°C was added to the slurry at 0.1%. After stirring and mixing, the mixture was quickly poured onto a glass plate covered with a polyethylene film, air-dried indoors, and then cooled to a uniform thickness using a cooling press.
A sheet-shaped architectural interior material containing 88% by weight of gypsum trihydrate in mm was obtained.

Table 1 shows the physical properties of this sample.

This sheet-like material has excellent water resistance even without heat treatment, is highly flexible, has good bending workability and anti-corporeal properties, and is recognized as a noncombustible material, so it is suitable as a sheet-like building interior material.

Example 4 In Example 3, a 35% by weight solution of zirconium oxychloride (ZrO(OH)CL) (manufactured by Kigenso Kagaku Kogyo Co., Ltd., Zircosol ZC-2) was added to the slurry instead of titanyl phosphate as a crosslinking agent. After stirring and mixing, the mixture was quickly poured onto a glass plate covered with a polyethylene film, air-dried indoors, and then heated to 120°C.
Heat treated for 10 minutes at
A sheet-like architectural interior material containing % by weight was obtained.

Table 1 shows various physical properties of this sample.

This sheet-like material has excellent water resistance, high flexibility, good bending workability and anti-cinder property, and is also recognized as a noncombustible material, so it is suitable as a sheet-like building interior material.

Comparative Example 1゜The slurry made of polyvinyl alcohol, glycerin, gypsum trihydrate and water obtained in Example 3 was subjected to the same smoothing and room temperature drying steps without adding any crosslinking agent.
A sheet material containing 88% by weight of gypsum trihydrate and having a thickness of 1.5 mm was obtained by heat treatment at 0° C. for 15 minutes.

Table 1 shows various physical properties of this sample. Although this sheet-like material is flexible, it dissolves when left in water and has poor water resistance, making it unsuitable as a building interior material.

Example 5 In Example 4, the non-hydraulic inorganic powder shown in Table 2 was replaced with flue gas desulfurization by-product gypsum (in Comparative Example 5-1.5-2, hydraulic inorganic powder was used) A sheet-like product having a thickness of 1.5 mm and containing 88% by weight of inorganic powder was obtained by the same method except that the same method was used.

Furthermore, each sample was allowed to stand at room temperature for 28 days before being subjected to physical property measurements.

As shown in Table 2, the physical properties of the obtained sheet-like materials are as follows: When non-hydraulic phosphoric acid by-product trihydrate gypsum and silica powder were used as inorganic powders, the sheet-like materials were highly flexible and good for building interiors. material was obtained.

On the other hand, when hydraulic gypsum hemihydrate or Portland cement is used as an inorganic powder, the moldability is good, but it is very hard, has no elongation, and is not suitable as an interior material because it lacks ease of handling as a sheet material. Appropriate.

In addition, in the case of Portland cement, there is also a problem with color tone.

Example 6゜In Example 4, 0.06 parts of an air entraining agent (Mighty AE-03, manufactured by Kao Atlas) and 2 pieces of glass fiber cut into 2 lengths without a sizing agent applied were added to the slurry. Adjust the slurry by adding .5 parts, stir for a little longer, and stir slightly. After wrapping, it was coated onto a continuous moving polyethylene film from a doctor blade with a width of 95 CrrL1 and a slit width of 30.

The moving speed of the film was 5.3 m/min, and the moldability was good.

Next, it was dried at room temperature and then heat-treated at 120° C. for 10 minutes.

Table 3 shows the physical properties of the obtained sheet-like material.

It is highly flexible, has good anti-cold properties, and has good flame retardancy, making it suitable for building interior materials.

Thermal conductivity was measured by stacking sheet-like materials to a thickness of 6 CrrL or more using a linear heat source method (thermal conductivity measuring device TC-22 model manufactured by Kyoto Electronics Industry Co., Ltd.).

Example 7 In Example 4, 55 parts of a 20% aqueous solution of the same polyvinyl alcohol was used instead of 109 parts of a 10% aqueous solution of polyvinyl alcohol, and 2.4 parts of heavy sodium sulfur was added as a decomposable blowing agent. , a viscous slurry was prepared.

This slurry was continuously extruded from a nozzle with a slit width of 2.0 using a screw extruder (40 mm φ), immediately dried on a hot plate at 120°C, and then heated at 150°C for 2 hours.
By heat-treating for 0 minutes, a foamed sheet material with a specific gravity of 0.47 and a thickness of 35 was obtained.

As shown in Table 3, this sheet-like material is highly flexible and has excellent heat insulation properties, and is suitable for interior construction materials.

Example 8゜A slurry was prepared in exactly the same manner as in Example 4, except that 0.12 parts of an air entraining agent (Mighty AE-03, manufactured by Kao Atlas) and 24 parts of heavy sodium chloride were added to the slurry.
After sufficiently entraining air bubbles using a confectionery whisk, the mixture was poured onto a polyethylene terephthalate film covered with a glass mat (Filament Matsu 1-MP 60 F manufactured by Nittobo Co., Ltd.).

Thereafter, it was immediately dried and heat-treated at 120°C for 40 minutes.

The physical properties of the obtained sheet-like material are as shown in Table 3. Specific gravity is 0.
2, it is highly flexible, has excellent heat insulation properties, and has excellent strength despite its light specific gravity, making it suitable for building interior materials (including ceiling materials, etc.).

Example 9゜A continuous piece of vinylon cheesecloth (Kuraray, Cremona cheesecloth 100) was passed through the slurry container prepared in Example 4, and the excess slurry adhering to the cheesecloth was scraped off by sandwiching it between two rubber rollers. (After straining, dry by blowing hot air.)

Further heat treatment was performed at 120° C. for 10 minutes to obtain a sheet-like product with a reinforcing material inside.

As shown in Table 3, this sheet-like material has excellent strength despite being highly flexible, and is particularly suitable as an interior construction material for walls, floors, etc.

Claims (1)

[Claims] 1 Contains an inorganic powder that does not harden by reaction with water, a water-soluble polymer, and a crosslinking agent for the polymer as essential components, and contains other additives 7x+ as necessary. A method for producing a sorted architectural interior material, which comprises forming a slurry containing the slurry into a sheet, drying it, and subjecting it to water insolubilization treatment if necessary. 2. The method for manufacturing a sheet-like architectural interior material according to claim 1, wherein gypsum trihydrate is used as the inorganic powder that does not harden due to reaction with water. 3. The method for producing a sheet-like architectural interior material according to claim 1, wherein a polyvinyl alcohol polymer is used as the water-soluble polymer. 4. Production of a sheet-like architectural interior material according to claim 1, which uses trihydrate gypsum as the inorganic powder that does not harden by reaction with water and uses polyvinyl alcohol-based polymer as the water-soluble polymer. Method. 5 Gypsum trihydrate is used as an inorganic powder that does not harden by reaction with water, a polyvinyl alcohol polymer is used as a water-soluble polymer, and a complex compound with the polyvinyl alcohol polymer is used as a crosslinking agent for the polymer. The method for manufacturing a sheet-like architectural interior material according to claim 1, which uses a metal compound capable of forming.