WO2017104473A1 - 石膏板及び石膏板の製造方法 - Google Patents
石膏板及び石膏板の製造方法 Download PDFInfo
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- WO2017104473A1 WO2017104473A1 PCT/JP2016/086116 JP2016086116W WO2017104473A1 WO 2017104473 A1 WO2017104473 A1 WO 2017104473A1 JP 2016086116 W JP2016086116 W JP 2016086116W WO 2017104473 A1 WO2017104473 A1 WO 2017104473A1
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- gypsum
- termite
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- board
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/72—Pest control
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
- A01N25/34—Shaped forms, e.g. sheets, not provided for in any other sub-group of this main group
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/26—Producing shaped prefabricated articles from the material by slip-casting, i.e. by casting a suspension or dispersion of the material in a liquid-absorbent or porous mould, the liquid being allowed to soak into or pass through the walls of the mould; Moulds therefor ; specially for manufacturing articles starting from a ceramic slip; Moulds therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B19/00—Machines or methods for applying the material to surfaces to form a permanent layer thereon
- B28B19/0092—Machines or methods for applying the material to surfaces to form a permanent layer thereon to webs, sheets or the like, e.g. of paper, cardboard
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/12—Nitrogen containing compounds organic derivatives of hydrazine
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/12—Nitrogen containing compounds organic derivatives of hydrazine
- C04B24/127—Nitro-compounds
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/12—Nitrogen containing compounds organic derivatives of hydrazine
- C04B24/128—Heterocyclic nitrogen compounds
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/16—Sulfur-containing compounds
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/6261—Milling
- C04B35/6262—Milling of calcined, sintered clinker or ceramics
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
- E04C2/04—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00413—Materials having an inhomogeneous concentration of ingredients or irregular properties in different layers
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
- C04B2111/0062—Gypsum-paper board like materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5436—Particle size related information expressed by the size of the particles or aggregates thereof micrometer sized, i.e. from 1 to 100 micron
Definitions
- the present invention relates to a gypsum board and a method for producing a gypsum board.
- plasterboard has been used for various applications such as building materials.
- a method for producing a gypsum plate containing an ant-proofing agent for example, a method of applying a solution containing an ant-proofing agent to the surface of the gypsum plate and drying it has been studied.
- the solution containing the antifungal agent is applied only to the surface exposed at the time of application. For this reason, when a gypsum board is cut after applying a solution containing an ant preventive agent, the ant preventive agent is not applied to the cut surface and the like, and thus cannot be sufficiently protected.
- Patent Document 1 discloses that an organic insecticide, particularly a white anticide, that is oil-soluble in mixed water or soluble in an oily medium is dispersed to form an aqueous dispersion, and the dry weight of the curable substance to be used is reduced.
- a method for producing a white ant control gypsum board characterized in that it is added in an amount of 0.005 to 5% by weight is disclosed. According to Patent Document 1, it is disclosed that a good distribution of an insecticide, particularly a termicide, in the entire gypsum molded body or the entire gypsum board for construction is disclosed.
- the termite-proofing agent is uniformly contained even inside the gypsum plate that is not normally exposed, so that sufficient effect is obtained.
- an object of one aspect of the present invention is to provide a gypsum board having an excellent ant-proofing effect while suppressing the content of the ant-proofing agent.
- a gypsum plate containing a poorly water-soluble anti-anticide in a gypsum core has three regions of a first end region, a central region, and a second end region having the same thickness from one surface side to the other surface side along the thickness direction. If All of the first end region, the central region, and the second end region contain the termite-proofing agent, Provided is a gypsum board in which the content of the termite-preventing agent in the central region is less than the content of the termite-preventing agent in the first end region and the second end region.
- the gypsum board of this embodiment is a gypsum board containing a poorly water-soluble anti-anticide in the gypsum core. Then, the three regions of the first end region, the central region, and the second end region having the same thickness from the one surface side to the other surface side along the thickness direction of the gypsum core In such a case, any of the first end region, the central region, and the second end region can contain an antifungal agent. Furthermore, the content of the termite-proofing agent in the central region can be made smaller than the content of the termite-proofing agent in the first end region and the second end region.
- the gypsum board of this embodiment will be described with reference to FIG.
- FIG. 1 shows a perspective view of a gypsum core 10 of a gypsum plate according to this embodiment.
- the gypsum core 10 of the present embodiment has a plate shape, and has one surface 11 and the other surface 12.
- a side surface 13 is disposed between the one surface 11 and the other surface 12.
- the shape of the rectangular parallelepiped was shown as the gypsum core 10, the gypsum board containing this gypsum core 10 can be used for a building material etc., It is not limited to the form which concerns, It can be set as a suitable shape according to a use. .
- the specific form of the gypsum board of the present embodiment is not particularly limited, and examples thereof include a gypsum board, a glass mat gypsum board, a glass fiber non-woven gypsum board, and a slag gypsum board.
- the plasterboard of this embodiment arrange
- the gypsum core 10 of the gypsum board of this embodiment is a first end region 141, a center region 142, and a second end region, which are three regions having the same thickness along the thickness direction.
- the thickness direction of the gypsum core 10 means the Z-axis direction in FIG. 1 which is a direction perpendicular to the one surface 11 and the other surface 12. As shown in FIG. 1, when the thickness of the gypsum core 10 is t, the first end region 141, the central region 142, and the second end region 143 each have a thickness of t / 3.
- the content of the termite-proofing agent in the central region 142 is the smallest. That is, the content of the termite-proofing agent in the central region 142 is smaller than the content of the termite-proofing agents in the other first end region 141 and the second end region 143, and the termite-proofing agent in the gypsum core 10.
- the first end region 141 and the second end region 143 are unevenly distributed on the surface side (front and back surfaces) of the gypsum core 10.
- the cut surface exposed when the gypsum board is cut is also required to contain an ant-proof agent. Therefore, in the gypsum plate of the present embodiment, by containing an ant inhibitor over the entire gypsum core, a cut surface is formed, and even when the cut surface is exposed, the ant proof effect can be sufficiently exhibited.
- the case where the cut surface is exposed is limited to certain cases such as when the gypsum board is cut as described above. Therefore, the first end region 141 and the second end region including the one surface 11 and the other surface 12 of the gypsum core 10 located in the vicinity of the surface of the gypsum plate occupying most of the area of the gypsum plate.
- the ant-repellent effect can be enhanced particularly efficiently.
- region 143 also comprise a part of cut surface exposed when a gypsum board is cut. For this reason, even if the termite-preventing agent is unevenly distributed in the first end region 141 and the second end region 143, the cut surface is sufficient in combination with the termite-preventing agent contained in the central region 142. An ant-proof effect can be demonstrated.
- a base paper for paper, a glass mat, a glass fiber nonwoven fabric, and the like can be disposed on the surface of the gypsum core or in the vicinity of the surface of the gypsum plate according to the form. For this reason, when analyzing the distribution of the termite-proofing agent in the gypsum core, it is possible to divide the gypsum core into three along the thickness direction after removing the base paper for board, etc., and use it for each divided area it can.
- the base paper for board arranged on the surface can be removed.
- the gypsum core obtained by removing the surface of the gypsum plate is divided into three regions having the same thickness along the thickness direction, and the first end region and the central region are sequentially formed from one surface side.
- the second end region can be subjected to analysis.
- the content of the anti-termite agent contained in the gypsum board of the present embodiment is not particularly limited, use can be selected by the type of termiticide, containing termiticide per 3 eg gypsum core 1cm
- the amount is preferably 0.1 ⁇ g or more and 330 ⁇ g or less.
- the content of the termite inhibitor per 1 cm 3 of the gypsum core is more preferably 0.1 ⁇ g or more and 180 ⁇ g or less, and further preferably 2.5 ⁇ g or more and 180 ⁇ g or less.
- the content of the gypsum core 1 cm 3 per termiticide can be suppressed amount of termiticide by less 330Myug, is because the cost advantageous.
- the content of the termite inhibitor per 1 cm 3 of the gypsum core is the average value of the entire gypsum core including the first end region, the center region, and the second end region described above. I mean.
- the gypsum plate manufacturing method of the present embodiment will be described in detail.
- the gypsum plate of the present embodiment is prepared by kneading raw materials containing calcined gypsum, water, and an antifungal agent to form a gypsum slurry, and then the gypsum slurry. Can be formed by hydrating and curing.
- the gypsum core of the gypsum plate of this embodiment is a hardened gypsum, and the calcined gypsum (semihydrate gypsum) in the gypsum slurry is agglomerated and solidified by the formation of acicular crystals of dihydrate gypsum by the hydration reaction. Is obtained.
- the gypsum board of this embodiment can contain dihydrate gypsum and an ant inhibitor.
- the termite-preventing agent contained in the plasterboard of this embodiment is not particularly limited, and various kinds of termite-preventing agents applicable to the plasterboard can be used.
- a poorly water-soluble anti-anticide can be preferably used.
- the term “poorly water-soluble termiticide” as used herein means a termiticide whose solubility in water is 1% by mass or less. This is because the use of a poorly water-soluble anti-repellent agent makes it possible to form an anti-ant inhibitor on the surface side of the plaster plate when the anti-prevent agent migrates to the surface side of the plaster plate in the process of forming and hardening the gypsum slurry. This is because the agent is not excessively distributed and can be a gypsum plate containing an anti-anticide at the center.
- Examples of the termite-proofing agent include neonicotinoid compounds, pyrethroid compounds, organochlorine compounds, organophosphorus compounds, carbamate compounds, pyrrole compounds, phenylpyrazole compounds, oxadiazine compounds, and the like.
- a neonicotinoid compound specifically, for example, clothianidin is used.
- Neonicotinoid compounds include (E) -1- (2-chloro-1,3-thiazol-5-ylmethyl) -3-methyl-2-nitroguanidine (generic name: clothianidin), N-acetyl-N— (2-chlorothiazol-5-yl) methyl-N′-methyl-N ′′ -nitroguanidine, N- (2-chlorothiazol-5-yl) methyl-N-methoxycarbonyl-N′-methyl-N ′′ — Nitroguanidine, 1- (6-chloro-3-pyridylmethyl) -N-nitroimidazoline-2-ylideneamine (generic name: imidacloprid), (EZ) -3- (2-chloro-1,3-thiazole-5- Ylmethyl) -5-methyl-1,3,5-oxadiazinan-4-ylidene (nitro) amine (generic name: thiamethoxam), (E) -N ′-
- pyrethroid compounds include allethrin, permethrin, tralomethrin, bifenthrin, acrinatrin, alpha cypermethrin, sifluthrin, ciphenothrin, praretrin, etofenprox, silafluophene, fenvalerate, and the like.
- organochlorine compounds examples include Kelsen.
- organophosphorus compounds examples include phoxime, pyridafenthion, fenitrothion, tetrachlorvinphos, diclofenthion, propetanephos, and the like.
- Carbamate compounds include carbaryl, fenobucarb, propoxur and the like.
- Examples of the pyrrole compound include chlorfenapyr.
- phenylpyrazole compounds examples include fipronil.
- Examples of the oxadiazine compound include indoxacarb.
- the formulation form of the above-mentioned termite-preventing agent is not particularly limited, and for example, a termite-preventing agent such as a microencapsulating agent, a powder, a granule, a flowable agent, or an emulsion can be used. Among these, from the viewpoint of controlling the average particle size and sustained release, it is preferable to use a microencapsulating agent as a formulation form of an antifungal agent.
- foam can be added to the gypsum slurry prepared when the gypsum board of this embodiment is manufactured.
- the gypsum board of this embodiment can contain the space
- the specific gravity of the gypsum board can be set to a desired range by adjusting the amount of the bubble-derived voids in the gypsum board.
- the size of the bubble-derived voids contained in the gypsum board is not particularly limited. However, it is preferable that the average value of the diameter of the bubble-derived voids contained in the gypsum plate is 100 ⁇ m or more and 1000 ⁇ m or less. This is because the strength of the gypsum core can be further increased when the diameter of the void derived from the foam is in the above range.
- the average value of the diameters of the voids derived from bubbles contained in the gypsum plate is more preferably 200 ⁇ m or more and 800 ⁇ m or less, and particularly preferably 200 ⁇ m or more and 600 ⁇ m or less. This is because the strength of the gypsum board can be further increased when the diameter of the void derived from the foam is in the above range.
- a method of setting the diameter of the foam contained in the gypsum board to a desired size when preparing the gypsum slurry, a method of selecting the foam size by a foaming machine for foaming the foaming agent, or a foam diameter adjusting agent And a method for controlling the size of the material.
- the shape of the void derived from the foam contained in the gypsum plate is preferably a good spherical shape.
- the strength of the gypsum board can be increased by making the foam contained in the gypsum board into a good spherical shape.
- the shape of the void derived from the foam contained in the gypsum plate is more preferably a true sphere or a shape close to a true sphere. This is because the strength of the gypsum plate can be further increased when the shape of the foam contained in the gypsum plate is a true sphere or a shape close to a true sphere.
- the diameter and shape of the bubble-derived voids contained in the gypsum plate can be observed and evaluated, for example, in a cross section at an arbitrary position of the gypsum plate. Observation and evaluation can be performed by means that can observe a magnified cross section of the gypsum board, such as a microscope or a scanning electron microscope (SEM).
- SEM scanning electron microscope
- the gypsum board of this embodiment can be formed by shaping
- voids derived from water are present in the gaps between crystals, they do not have a spherical shape, unlike the voids derived from bubbles described above. Further, the voids derived from bubbles can have a diameter of, for example, 10 ⁇ m or more, whereas the size of the voids derived from water is smaller than this. For this reason, the space
- the gypsum board of this embodiment can further contain arbitrary components.
- the gypsum slurry prepared when producing a gypsum board has an adhesive property that improves the adhesion between the coating material and the gypsum core, such as starch and polyvinyl alcohol.
- Improvement agents inorganic fibers such as glass fibers, lightweight aggregates, refractory materials such as vermiculite, setting modifiers, water reducing agents, foam size modifiers such as sulfosuccinate surfactants, water repellents such as silicone and paraffin
- foam size modifiers such as sulfosuccinate surfactants
- water repellents such as silicone and paraffin
- the gypsum board of this embodiment can also contain substances derived from these components added to the gypsum slurry.
- the ant-preventive agent is contained over the entire gypsum core included in the gypsum plate, and therefore a sufficient ant-proof effect can be exhibited.
- the gypsum plate of this embodiment has a sufficient amount of antibacterial agent while suppressing the amount of the addition of the antibacterial agent because the antibacterial agent is unevenly distributed on the surface side of the gypsum core included in the gypsum plate. The ant effect can be demonstrated.
- the method for producing a gypsum plate according to the present embodiment is a method for producing a gypsum plate containing a poorly water-soluble termite inhibitor in a gypsum core, and can include the following steps.
- the average particle diameter of calcined gypsum used as a raw material can be 100 ⁇ m or less, and the average particle diameter of the termite-proofing agent can be 50 ⁇ m or less.
- raw materials containing calcined gypsum, water, and an anti-anticide can be kneaded.
- calcined gypsum contained in the raw material is also called calcium sulfate 1/2 hydrate, and is an inorganic composition having hydraulic properties.
- the calcined gypsum used in the method for producing a gypsum plate according to the present embodiment is obtained by firing natural or gypsum such as natural gypsum, by-product gypsum, and flue gas desulfurization gypsum in the air or in water (including in steam). Either ⁇ -type or ⁇ -type calcined gypsum can be used alone, or a mixture of both can be used. Further, the calcined gypsum used in the method for producing a gypsum plate of the present embodiment may contain type III anhydrous gypsum that is produced in a trace amount when obtaining calcined gypsum.
- dihydrate gypsum such as natural gypsum needs to be fired under pressure in water or steam using an autoclave.
- ⁇ -type calcined gypsum can be produced by firing dihydrate gypsum such as natural gypsum at atmospheric pressure.
- the termite-preventing agent contained in the raw material is not particularly limited, and various kinds of termite-preventing agents applicable to the gypsum board can be used. However, as described above, a poorly water-soluble termite inhibitor can be preferably used. In addition, since the material etc. which can be used suitably as an ant preventive agent have already been described, description is abbreviate
- the form for providing the termite-preventing agent contained in the raw material that is, the preparation form of the termite-preventing agent is not particularly limited, and as described above, for example, various encapsulating forms such as microencapsulating agents and slurry forms such as emulsions. Things can be used.
- a microencapsulating agent can be preferably used as the termite-proofing agent.
- the content of the termite-preventing agent in the raw material is not particularly limited.
- the content ratio of the termite-preventing agent is 3 It is preferably 0.0 ⁇ 10 ⁇ 5 mass% or more and 1.5 ⁇ 10 ⁇ 2 mass% or less, more preferably 7.5 ⁇ 10 ⁇ 4 mass% or more and 8.0 ⁇ 10 ⁇ 3 mass% or less. preferable.
- the content ratio of the ant-preventing agent is 3.0 ⁇ 10 in the total of the content of calcined gypsum in the raw material and the content of the ant-preventing agent. This is because, when the content is ⁇ 5 % by mass or more, the termite-proofing agent can be more uniformly dispersed in the raw material.
- the content of the ant-preventive agent in the total of the content of calcined gypsum in the raw material and the content of the ant-preventive agent is sufficient to be 1.5 ⁇ 10 ⁇ 2 mass% or less. This is because an excellent ant-proofing effect can be exhibited.
- the content of the above-mentioned termite preventive agent may be more than 1.5 ⁇ 10 ⁇ 2 mass%, but when producing a gypsum board, the content of the termite preventive agent is 1.5 ⁇ 10 ⁇ 2 mass%. Compared with the following cases, the effect of enhancing the ant-proof effect is not so much seen. For this reason, the content of the above-mentioned termite preventive is preferably 1.5 ⁇ 10 ⁇ 2 mass% or less.
- the average particle size of calcined gypsum used as a raw material is not particularly limited, but is preferably 100 ⁇ m or less, and more preferably 50 ⁇ m or less.
- the lower limit value of the average particle size of calcined gypsum can be set to 10 ⁇ m or more, for example.
- the average particle diameter of the termite-proofing agent used as the raw material is not particularly limited, but is preferably 50 ⁇ m or less, for example, and more preferably 20 ⁇ m or less. This is because, when the average particle size of the termite-proofing agent used as the raw material exceeds 50 ⁇ m, for example, sedimentation may occur during preparation and it may be difficult to handle. And when average particle diameter is 20 micrometers or less, it is because the termite-proofing agent can be unevenly distributed especially in a surface layer part in a final product, and it is preferable.
- the average particle diameter of the termite-proofing agent used as the raw material is preferably 0.1 ⁇ m or more, more preferably 0.5 ⁇ m or more, and still more preferably 3.0 ⁇ m or more. It may not be technically easy to manufacture an ant control agent having an average particle size of less than 0.1 ⁇ m, and an ant control agent having an average particle size of less than 0.5 ⁇ m may require special technology for its manufacture. In some cases, it is difficult to increase the concentration of the termite inhibitor having an average particle size of less than 3.0 ⁇ m.
- the average particle diameter means the particle diameter (median diameter) at an integrated value of 50% in the particle size distribution obtained by the laser diffraction / scattering method.
- the average particle diameter has the same meaning.
- the gypsum slurry formed into a desired shape is hydrated and cured, and then dried to form a gypsum plate.
- Water moves to the surface side of the gypsum plate and escapes from the surface to the outside.
- the water contained in the gypsum slurry moves to the surface side of the gypsum board together with the additive components in the gypsum slurry such as the termite inhibitor contained in the gypsum slurry.
- the average particle size of calcined gypsum contained in the raw material of the gypsum slurry is 100 ⁇ m or less and the average particle size of the termite-proofing agent is 50 ⁇ m or less, it is suitable for the termiticide to pass between the hydrated calcined gypsum particles. It is considered that a gap of size is formed, and the termite-proofing agent can be appropriately migrated to the surface side of the gypsum plate.
- the average particle size of calcined gypsum contained in the raw material of the gypsum slurry is 100 ⁇ m or less, and the average particle size of the termite-proofing agent is 50 ⁇ m or less, so that the surface side as viewed in the thickness direction of the gypsum core described above It is possible to obtain a gypsum plate in which the anti-anticide is unevenly distributed.
- water can be added.
- the amount of water added when forming the gypsum slurry is not particularly limited, and can be set to any amount depending on the required fluidity.
- the raw material of the gypsum slurry can contain arbitrary components other than the calcined gypsum, the ant-repellent, and water described so far.
- foam can be added when forming a gypsum slurry.
- the specific gravity of the gypsum board obtained by adjusting the addition amount of foam can be made into a desired range.
- the method of adding foam when forming the gypsum slurry is not particularly limited, and can be added by any method.
- foaming agent foaming agent
- water froaming water
- bubbles are formed by stirring while taking in air.
- a gypsum slurry with added foam can be formed.
- it can also be set as the gypsum slurry which added the foam by adding the formed foam to the gypsum slurry formed by premixing calcined gypsum, the termite-proofing agent and water.
- the foaming agent used when forming the foam is not particularly limited, and examples thereof include sodium alkyl sulfate, alkyl ether sulfate, sodium alkylbenzene sulfonate, and polyoxyethylene alkyl sulfate.
- the amount of foam added is not particularly limited, and can be arbitrarily selected according to the specific gravity required for the gypsum board to be produced.
- the raw materials include, in addition, an adhesive improver that improves the adhesion between the coating material and the gypsum core, such as starch and polyvinyl alcohol, inorganic fibers such as glass fibers and lightweight aggregates, refractory materials such as vermiculite, Various additives that are conventionally added to the raw materials of gypsum hardened bodies such as setting modifiers, water reducing agents, foam diameter adjusting agents such as sulfosuccinate type surfactants, water repellents such as silicone and paraffin may be added. it can.
- an adhesive improver that improves the adhesion between the coating material and the gypsum core
- inorganic fibers such as glass fibers and lightweight aggregates
- refractory materials such as vermiculite
- additives that are conventionally added to the raw materials of gypsum hardened bodies such as setting modifiers, water reducing agents, foam diameter adjusting agents such as sulfosuccinate type surfactants, water repellents such as silicone
- all the components constituting the raw material may be kneaded at the same time, but the kneading can be performed in a plurality of times. For example, after mixing and kneading solid components of raw materials to form a gypsum composition, adding liquid components such as water of the raw materials to the obtained gypsum composition and further kneading to obtain a gypsum slurry You can also.
- the means for kneading the raw materials is not particularly limited, and for example, a mixer or the like can be used.
- the obtained gypsum slurry can be formed into a desired shape in the forming step. Specifically, since it is a gypsum plate, it can be formed to have a plate shape, for example.
- FIG. 2 is a side view partially and schematically showing a configuration example of an apparatus for forming a gypsum board.
- the front cover base paper (board base paper) 21 which is a surface material is conveyed along the production line from the right side to the left side in the figure.
- the mixer 22 can be arranged at a predetermined position related to the transport line, for example, above or next to the transport line. And in the single mixer 22, calcined gypsum which is a raw material of gypsum slurry, an anti-anticide, water, and depending on the case, various additives can be knead
- solids such as calcined gypsum can be mixed and stirred in advance to obtain a gypsum composition that is a mixture, and then supplied to the mixer 22.
- a gypsum slurry having an arbitrary density by adding foam from the gypsum slurry collection ports 221, 222, and 225 and adjusting the amount of foam added.
- the first gypsum slurry 23 and the second gypsum slurry 24 having different densities can be prepared by adjusting the amount of foam added.
- the obtained first gypsum slurry 23 is placed on the front cover base paper (board base paper) 21 and the back cover base paper (board base paper) 26 on the upstream side in the transport direction of the roll coater 25 through the delivery pipes 223 and 224. To supply.
- 271, 272, and 273 denote an application roll, a receiving roll, and a scraping roll, respectively.
- the first gypsum slurry 23 on the front cover base paper 21 and the back cover base paper 26 reaches the extension part of the roll coater 25 and is extended in the extension part. Both the thin layer and the edge region of the first gypsum slurry 23 are formed on the front cover base paper 21. Similarly, a thin layer of the first gypsum slurry 23 is formed on the back cover base paper 26.
- FIG. 2 shows an example in which the first gypsum slurry 23 is applied to the front cover base paper 21 and the back cover base paper 26 using the roll coater 25, it is not limited to such a form.
- the first gypsum slurry 23 may be applied only to either the front cover base paper 21 or the back cover base paper 26 using the roll coater 25.
- the first gypsum slurry 23 can be disposed only on the side end portion of the front cover base paper 21.
- the front cover base paper 21 is transported as it is, and the back cover base paper 26 is turned in the transport line direction of the front cover base paper 21 by a turning roller 28. Both the front cover base paper 21 and the back cover base paper 26 reach the molding machine 29.
- the second gypsum slurry 24 is supplied from the mixer 22 through the pipe 226 between the thin layers formed on the front cover base paper 21 and the back cover base paper 26. Therefore, a layer formed of the first gypsum slurry 23, a layer formed of the second gypsum slurry 24, and the first gypsum slurry 23 between the front cover base paper 21 and the back cover base paper 26. It is possible to form a continuous laminated body in which layers formed by the above are laminated.
- FIG. 2 the example which manufactured the 1st gypsum slurry 23 and the 2nd gypsum slurry 24 with one mixer 22 was shown, However, 2 units
- the second gypsum slurry 24 may be manufactured.
- the gypsum slurry of one kind of density is manufactured, and this is supplied on the base paper for boards. There may be.
- gypsum slurry having a predetermined density is supplied and deposited on the surface cover base paper (board base paper) that is continuously conveyed. Then, the lower paper is folded along engraved lines formed at both end edges so as to enclose the gypsum slurry. At this time, a back cover base paper (board base paper) transported at the same speed is stacked on the layer of gypsum slurry. Next, the gypsum board is molded by passing through a molding machine that determines the thickness and width of the gypsum board. A gypsum board can also be formed by the above procedure.
- the base paper for boards which is a surface material is changed into a glass fiber nonwoven fabric (glass tissue), a glass mat, etc., so that this may be buried on the surface or near the surface.
- Various gypsum boards can also be produced by arranging them in the above.
- a curing step for hydrating and curing the gypsum slurry can be performed.
- the curing step can be carried out when calcined gypsum (half-water gypsum) in the gypsum slurry is condensed and solidified by the formation of needle-shaped crystals of dihydrate gypsum by a hydration reaction. For this reason, in the molded body formed at the shaping
- the manufacturing method of the gypsum board of this embodiment can further provide arbitrary processes, such as a rough cutting process, a drying process, a cutting process, and a loading process, as needed.
- a rough cutting step of roughly cutting the molded body molded in the molding step with a rough cutting cutter may be performed.
- the continuous formed body formed in the forming step can be cut into a predetermined length by the rough cutting cutter.
- a drying process can be performed in which excess moisture is dried on the molded body molded in the molding process or the molded body roughly cut in the rough cutting process.
- finished can be supplied to a drying process.
- the drying step can be performed by forcibly drying the molded body using a dryer.
- the method of forcibly drying the molded body with a dryer is not particularly limited.
- a dryer is provided on the conveyance path of the molded body, and the molded body is continuously dried by passing through the dryer. can do.
- a molded object can also be carried in in dryer and a molded object can also be dried for every batch.
- a cutting process for cutting into a product of a predetermined length and the obtained gypsum hardened body or gypsum board is stacked with a lifter and stored in a warehouse or shipped. In order to do so, it is possible to implement a loading process or the like for loading onto a truck or the like.
- the gypsum plate manufacturing method of the present embodiment described above it is possible to obtain a gypsum plate in which an antifungal agent is unevenly distributed on the surface side of the gypsum plate.
- the termite-preventing agent contained in the gypsum slurry migrates to the surface side of the plasterboard. This is because it can be unevenly distributed on the surface side of the gypsum plate.
- a raw material containing calcined gypsum having an average particle size of 100 ⁇ m or less, an antifungal agent having an average particle size of 50 ⁇ m or less, and water was obtained by kneading.
- a gypsum board in which the gypsum slurry is cured can be obtained.
- the above-mentioned calcined gypsum has an average particle size of 100 ⁇ m or less, and the above termite-proofing agent can obtain a gypsum plate having an average particle size of 50 ⁇ m or less.
- the gypsum board has a first end region, a central region, and a second end region having the same thickness from one surface side to the other surface side along the thickness direction of the gypsum plate.
- Any of the first end region, the central region, and the second end region can contain an anti-anticide.
- the content of the ant-preventing agent in the central region can be made smaller than the content of the ant-preventing agent in the first end region and the second end region.
- the method for producing a gypsum plate according to the present embodiment is a method for producing a gypsum plate containing a poorly water-soluble termite inhibitor in a gypsum core, and can include the following steps.
- mixing process two types of gypsum slurry of the 1st gypsum slurry and the 2nd gypsum slurry with much foam content rather than the 1st gypsum slurry can be prepared.
- the surface layer can be formed into a laminated plate shape.
- raw materials containing calcined gypsum, water, and an anti-anticide can be kneaded.
- the description of the calcined gypsum, the termite-proofing agent and the water contained in the raw material can be omitted because they are the same as those described in the first configuration example.
- the raw material used when preparing at least the second gypsum slurry can further contain foam. That is, in the kneading step when preparing the second gypsum slurry, the raw materials containing calcined gypsum, water, an antifungal agent, and foam can be kneaded. Since the bubble is already described in the first configuration example, the description thereof is omitted here.
- the average particle diameter of calcined gypsum and an ant-proofing agent is not specifically limited.
- the average particle size of the calcined gypsum is 100 ⁇ m or less, and the average particle size of the termite-proofing agent is 50 ⁇ m or less. It migrates to the surface side of the gypsum board and becomes easy to be unevenly distributed. For this reason, the material which has the average particle diameter demonstrated in the 1st structural example can also be used about calcined gypsum and an antifungal agent.
- the raw material can further contain various additives in addition to the above-mentioned calcined gypsum and the like. Since the example of various additives was demonstrated in the 1st structural example, description is abbreviate
- the first gypsum slurry and the second gypsum slurry having a larger amount of foam than the first gypsum slurry may be prepared. it can.
- the first gypsum slurry and the second gypsum slurry can be formed by kneading all the components at the same time as in the case of the first configuration example, but the gypsum composition is formed in advance. Then, a liquid component may be added to the gypsum composition and further kneaded to form a gypsum slurry.
- the gypsum slurry formed in the kneading process can be molded into a plate shape.
- the first surface layer, the center layer, and the second surface layer can be laminated in order from the lower surface side so that the first surface layer and the second surface can be laminated.
- the layer can be formed from the first gypsum slurry and the center layer from the second gypsum slurry.
- each layer is not particularly limited, but the first surface layer and the second surface layer are preferably formed so that each thickness is 0.1 mm or more and 1.0 mm or less, More preferably, it is 0.1 mm or more and 0.5 mm or less. And according to the thickness at the time of setting it as a gypsum board, a remainder can be comprised by a center layer.
- the central layer is the second gypsum with much foam.
- the center layer has more voids than the first surface layer and the second surface layer.
- the termite-proofing agent aggregates on the first surface layer and the second surface layer side, and the content of the termite-proofing agent contained in the central layer is the first surface layer and the second surface. It can be made less than the content of the termite preventer contained in the layer. Therefore, it can be set as the gypsum board where the termite-proofing agent was unevenly distributed on the surface side.
- calcined gypsum which is a raw material of the gypsum slurry, an anti-anticide, water, and optionally various additives are further kneaded to form a base gypsum slurry.
- the amount of foam added from the collection port 225 of the gypsum slurry is made larger than the amount of foam added from the collection ports 221, 222, and the first gypsum slurry 23 and the second gypsum slurry having different densities. 24 can be prepared.
- the obtained first gypsum slurry 23 is placed on the front cover base paper (board base paper) 21 and the back cover base paper (board base paper) 26 on the upstream side in the transport direction of the roll coater 25 through the delivery pipes 223 and 224. To supply. Then, the first gypsum slurry 23 on the front cover base paper 21 and the back cover base paper 26 reaches the extension part of the roll coater 25 and is extended in the extension part. Both the thin layer and the edge region of the first gypsum slurry 23 are formed on the front cover base paper 21. Similarly, a thin layer of the first gypsum slurry 23 is formed on the back cover base paper 26.
- the front cover base paper 21 is transported as it is, and the back cover base paper 26 is turned in the transport line direction of the front cover base paper 21 by a turning roller 28. Both the front cover base paper 21 and the back cover base paper 26 reach the molding machine 29.
- the second gypsum slurry having a higher foam content than the first gypsum slurry 23 through the conduit 226 from the mixer 22. 24 is supplied.
- the first surface layer formed by the first gypsum slurry 23, the center layer formed by the second gypsum slurry 24, and the first A continuous laminated body in which the second surface layer formed of one gypsum slurry 23 is laminated can be formed.
- FIG. 2 the example which manufactured the 1st gypsum slurry 23 and the 2nd gypsum slurry 24 with one mixer 22 was shown, However, 2 units
- the second gypsum slurry 24 may be manufactured.
- the base paper for boards which is a surface material is changed into a glass fiber nonwoven fabric (glass tissue), a glass mat, etc., so that this may be buried on the surface or near the surface.
- Various gypsum boards can also be produced by arranging them in the above.
- the 1st surface layer and 2nd surface layer which are located in the surface side are formed with the 1st gypsum slurry, and rather than the 1st gypsum slurry.
- a gypsum board in which a central layer is formed by the second gypsum slurry having a large foam content can be obtained.
- the central layer contains more voids than the first surface layer and the second surface layer, and the content of the termite-proofing agent contained in the central layer is changed to the first surface layer and the second surface layer. It can be made less than the content of the termite preventer contained in the layer. That is, it is possible to obtain a gypsum plate in which the anti-anticide is unevenly distributed on the surface side of the gypsum plate.
- stacked in that order can be obtained.
- a gypsum plate containing a sparingly water-soluble antproofing agent in a gypsum core, and the gypsum core can be formed from a laminate of gypsum slurry.
- the laminated body of gypsum slurry can have a structure in which, for example, a first surface layer, a center layer, and a second surface layer are laminated in that order, and the first surface layer and the second surface layer are at least water,
- the first gypsum slurry containing calcined gypsum and an ant-preventing agent, and the central layer contains at least water, calcined gypsum, ant-preventing agent, and foam, and has a higher foam content than the first gypsum slurry. It is possible to have a structure made of a gypsum slurry.
- the gypsum board has a first end region, a central region, and a second end region having the same thickness from one surface side to the other surface side along the thickness direction of the gypsum plate.
- Any of the first end region, the central region, and the second end region can contain an anti-anticide.
- the content of the ant-preventing agent in the central region can be made smaller than the content of the ant-preventing agent in the first end region and the second end region.
- the method for producing a gypsum plate according to the present embodiment is a method for producing a gypsum plate containing a poorly water-soluble termite inhibitor in a gypsum core, and can include the following steps.
- mixing process two types of gypsum slurries, the 1st gypsum slurry and the 2nd gypsum slurry with less content of an antifungal agent than the 1st gypsum slurry, can be prepared.
- the surface layer can be formed into a laminated plate shape.
- raw materials containing calcined gypsum, water, and an anti-anticide can be kneaded.
- the description of the calcined gypsum, the termite-proofing agent and the water contained in the raw material can be omitted because they are the same as those described in the first configuration example.
- the average particle diameter of calcined gypsum and an ant-proofing agent is not specifically limited.
- the average particle size of the calcined gypsum is 100 ⁇ m or less, and the average particle size of the termite-proofing agent is 50 ⁇ m or less. It migrates to the surface side of the gypsum board and becomes easy to be unevenly distributed. For this reason, the material which has the average particle diameter demonstrated in the 1st structural example can also be used about calcined gypsum and an antifungal agent.
- the raw material can further contain foam and various additives. Since the example of foam and various additives was demonstrated in the 1st structural example, description is abbreviate
- the first gypsum slurry and the second gypsum slurry in which the addition amount of the toxicidal agent is smaller than that of the first gypsum slurry are prepared. be able to.
- the first gypsum slurry and the second gypsum slurry can be formed by kneading all the components at the same time as in the case of the first configuration example, but the gypsum composition is formed in advance. Then, a liquid component may be added to the gypsum composition and further kneaded to form a gypsum slurry.
- the gypsum slurry formed in the kneading process can be molded into a plate shape.
- the first surface layer, the center layer, and the second surface layer can be laminated in order from the lower surface side so that the first surface layer and the second surface can be laminated.
- the layer can be formed from the first gypsum slurry and the center layer from the second gypsum slurry.
- each layer is not particularly limited, but the first surface layer and the second surface layer are preferably formed so that each thickness is 0.1 mm or more and 1.0 mm or less, More preferably, it is 0.1 mm or more and 0.5 mm or less. And according to the thickness at the time of setting it as a gypsum board, a remainder can be comprised by a center layer.
- the central layer has a small amount of the termiticide. Formed with a second gypsum slurry. For this reason, the center layer can reduce the content of the termite-proofing agent as compared with the first surface layer and the second surface layer. Therefore, it can be set as the gypsum board where the termite-proofing agent was unevenly distributed on the surface side.
- the structure demonstrated in the 2nd structure example can also be used together, and the 2nd gypsum slurry has 1st gypsum in addition to there being less content of an antifungal agent than a 1st gypsum slurry. It can also be set as a gypsum slurry having a higher foam content than the slurry. By comprising in this way, an antifungal agent can be unevenly distributed to the surface side more reliably.
- calcined gypsum which is a raw material of the gypsum slurry, an anti-anticide, water, and optionally various additives are further kneaded to form a base gypsum slurry.
- a base gypsum slurry Can be manufactured.
- the content of the ant preventive agent is higher than that of the first gypsum slurry 23 having a high content of the ant preventive agent and the first gypsum slurry 23.
- a small amount of the second gypsum slurry 24 can be prepared.
- the obtained first gypsum slurry 23 is placed on the front cover base paper (board base paper) 21 and the back cover base paper (board base paper) 26 on the upstream side in the transport direction of the roll coater 25 through the delivery pipes 223 and 224. To supply. Then, the first gypsum slurry 23 on the front cover base paper 21 and the back cover base paper 26 reaches the extension part of the roll coater 25 and is extended in the extension part. Both the thin layer and the edge region of the first gypsum slurry 23 are formed on the front cover base paper 21. Similarly, a thin layer of the first gypsum slurry 23 is formed on the back cover base paper 26.
- the front cover base paper 21 is transported as it is, and the back cover base paper 26 is turned in the transport line direction of the front cover base paper 21 by a turning roller 28. Both the front cover base paper 21 and the back cover base paper 26 reach the molding machine 29.
- the second content of the antifungal agent is lower than that of the first gypsum slurry 23 through the conduit 226 from the mixer 22.
- a gypsum slurry 24 is supplied.
- the first surface layer formed by the first gypsum slurry 23, the center layer formed by the second gypsum slurry 24, and the first A continuous laminated body in which the second surface layer formed of one gypsum slurry 23 is laminated can be formed.
- FIG. 2 the example which manufactured the 1st gypsum slurry 23 and the 2nd gypsum slurry 24 with one mixer 22 was shown, However, 2 units
- the second gypsum slurry 24 may be manufactured.
- two types of gypsum slurry having different content of the termite preventer can be prepared by changing the content of the termite preventer in the raw material supplied to the mixer.
- the base paper for boards which is a surface material is changed into a glass fiber nonwoven fabric (glass tissue), a glass mat, etc., so that this may be buried on the surface or near the surface.
- Various gypsum boards can also be produced by arranging them in the above.
- the 1st surface layer and 2nd surface layer which are located in the surface side are formed with the 1st gypsum slurry, and rather than the 1st gypsum slurry.
- a gypsum board in which a central layer is formed by the second gypsum slurry having a low content of the termite-proofing agent can be obtained.
- the content of the termiticide contained in the central layer can be made smaller than the content of the termiticide contained in the first surface layer and the second surface layer. That is, it is possible to obtain a gypsum plate in which the termite-proofing agent is unevenly distributed on the surface side of the gypsum plate.
- a gypsum plate containing a sparingly water-soluble antproofing agent in a gypsum core, and the gypsum core can be formed from a laminate of gypsum slurry.
- the laminate of gypsum slurry can have a structure in which, for example, a first surface layer, a center layer, and a second surface layer are laminated in that order.
- the 1st surface layer and the 2nd surface layer consist of the 1st gypsum slurry containing at least water, calcined gypsum, and an antproof agent, and the central layer contains at least water, calcined gypsum and the antproof agent, It can have the structure which consists of a 2nd gypsum slurry with less content of an ant preventive agent than a 1st gypsum slurry.
- stacked in that order can be obtained.
- the gypsum board has a first end region, a central region, and a second end region having the same thickness from one surface side to the other surface side along the thickness direction of the gypsum plate.
- Any of the first end region, the central region, and the second end region can contain an anti-anticide.
- the content of the ant-preventing agent in the central region can be made smaller than the content of the ant-preventing agent in the first end region and the second end region.
- Example 1 A gypsum board was produced using the apparatus shown in FIG. 2, and the content of the termite-proofing agent contained in the gypsum board was evaluated.
- the front cover base paper (board base paper) 21 is continuously conveyed along the production line from the right side to the left side in FIG.
- the board base paper used was 200 g / m 2 for both the front cover base paper 21 and the back cover base paper 26 described later.
- a gypsum slurry (gypsum slurry) was prepared (kneading step).
- the average particle diameter of calcined gypsum and the termite-proofing agent was evaluated using a laser diffraction particle size distribution measuring device (trade name: Microtrac HRA manufactured by Nikkiso Co., Ltd.).
- the gypsum slurry obtained in the mixer 22 was supplied to the front cover base paper 21 and the back cover base paper 26 from the sorting ports 221 and 222 through the delivery pipes 223 and 224 on the upstream side in the transport direction of the roll coater 25.
- the first gypsum slurry 23 on the front cover base paper 21 and the back cover base paper 26 reaches the extension part of the roll coater 25 and is extended in the extension part. Both the thin layer and the edge region of the first gypsum slurry 23 are formed on the front cover base paper 21. Similarly, a thin layer of the first gypsum slurry 23 is formed on the back cover base paper 26.
- the front cover base paper 21 is transported as it is, and the back cover base paper 26 is turned in the transport line direction of the front cover base paper 21 by a turning roller 28.
- both the front cover base paper 21 and the back cover base paper 26 reach the molding machine 29.
- the second gypsum slurry 24 is supplied through the conduit 226 between the thin layers formed on the front cover base paper 21 and the back cover base paper 26 which are base papers for board.
- foam was added so that the specific gravity of the gypsum core was 0.65.
- the foam was produced by foaming a foaming agent (main component: alkyl ether sulfate).
- the layer formed with the 1st gypsum slurry 23 and the 2nd gypsum slurry 24 was arrange
- a typical laminate is formed.
- the gypsum board was molded so as to have a thickness of 12.5 mm (molding process).
- the obtained molded body was cured in the process of conveyance (curing process). Then, it hardens and reaches a rough cutting cutter (not shown).
- a rough cutting cutter cuts a continuous laminated body into a plate-like body of a predetermined length, and forms a plate-like body consisting mainly of gypsum coated with base paper, that is, a semi-finished product of gypsum board Is done.
- the base paper for gypsum board on both surfaces of the gypsum board was peeled off to make only the gypsum core. Then, the three regions of the first end region, the central region, and the second end region having the same thickness from the one surface side to the other surface side along the thickness direction of the gypsum core And each region was pulverized.
- the active ingredient of the termite-proofing agent was detected in any of the first end region, the central region, and the second end region. For this reason, it has confirmed that the termite-proofing agent was contained over the thickness direction of the gypsum board.
- Example 1 A gypsum board was produced in the same manner as in Example 1 except that the termite-proofing agent was not added. After the gypsum board was manufactured, dispersion was performed by dispersing 0.33 g of an antifungal agent (same as in Example 1) in water on one surface cover base paper and the other cover base paper of the gypsum board cut to a size of 200 mm ⁇ 200 mm. The liquid was applied.
- the base paper for gypsum board on both surfaces of the gypsum board was peeled off to make only the gypsum core. Then, the three regions of the first end region, the central region, and the second end region having the same thickness from the one surface side to the other surface side along the thickness direction of the gypsum core And each region was pulverized.
- Example 2 With respect to 100 parts by mass of calcined gypsum having an average particle size of 50 ⁇ m, 0.0024 parts by mass of an antifungal agent (same as in Example 1), 1 part by mass of a coagulation adjusting agent, 0.3 parts by mass of a water reducing agent, 80 parts by mass of water
- a gypsum slurry (gypsum slurry) was prepared by kneading using a commercially available blender (model number: SM-R50, manufactured by SANYO) so that the composition of And foam was added and the gypsum slurry was prepared so that the specific gravity of the gypsum hardened body which hardened this gypsum slurry might be set to 0.65 (kn
- the obtained gypsum slurry was sandwiched and molded into a glass plate so that the size of the cured body was a plate-like body having a thickness of 12.5 mm (molding step).
- the obtained molded body was cured to form a gypsum cured body (curing process).
- the gypsum hardened body was further forcedly dried by a dryer to remove excess moisture, and a gypsum board was produced (drying process).
- the silica sand in the container install any one of the gypsum board of this example, the gypsum board of Example 1, a gypsum board not containing an anti-anticide, and put a feeding tree on each specimen, In the center of the container, 50 termite ants were released at once, and the number of days until the termites died was observed.
- the gypsum board and the gypsum board all cut into the size of 40 mm x 20 mm x 12.5 mm was used.
- the content of the termite-proofing agent in the gypsum plate of this example and the gypsum board of Example 1 is about 13.2 ⁇ g / cm 3 .
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Abstract
Description
前記石膏芯を厚さ方向に沿って、一方の表面側から他方の表面側に向かって、厚さの等しい第1の端部領域、中央領域、及び第2の端部領域の3つの領域とした場合に、
前記第1の端部領域、前記中央領域、及び前記第2の端部領域のいずれも前記防蟻剤を含有し、
前記中央領域の前記防蟻剤の含有量が、前記第1の端部領域及び前記第2の端部領域の前記防蟻剤の含有量よりも少ない石膏板を提供する。
[石膏板]
本実施形態の石膏板の一構成例について説明する。
そして、石膏芯を厚さ方向に沿って、一方の表面側から他方の表面側に向かって、厚さの等しい第1の端部領域、中央領域、及び第2の端部領域の3つの領域とした場合に、第1の端部領域、中央領域、及び第2の端部領域のいずれも防蟻剤を含有することができる。さらに、中央領域の防蟻剤の含有量が、第1の端部領域及び第2の端部領域の防蟻剤の含有量よりも少なくすることができる。
[石膏板の製造方法]
次に、本実施形態の石膏板の製造方法の構成例について説明する。なお、本実施形態の石膏板の製造方法により、既述の本実施形態の石膏板を好適に製造できる。このため、重複する説明については一部記載を省略する。
(第1の構成例)
本実施形態の石膏板の製造方法の第1の構成例について説明する。
石膏スラリーを成形する成形工程。
成形工程で得られた成形体を硬化させる硬化工程。
第1の端部領域、中央領域、及び第2の端部領域のいずれも防蟻剤を含有できる。そして、中央領域の防蟻剤の含有量を、第1の端部領域及び第2の端部領域の防蟻剤の含有量よりも少なくできる。
(第2の構成例)
次に、本実施形態の石膏板の製造方法の第2の構成例について説明する。
石膏スラリーを成形する成形工程。
成形工程で得られた成形体を硬化させる硬化工程。
そして、混練工程では、第1の石膏スラリーと、第1の石膏スラリーよりも泡の含有量が多い第2の石膏スラリーとの2種類の石膏スラリーとを調製できる。
第1の端部領域、中央領域、及び第2の端部領域のいずれも防蟻剤を含有できる。そして、中央領域の防蟻剤の含有量を、第1の端部領域及び第2の端部領域の防蟻剤の含有量よりも少なくできる。
(第3の構成例)
次に、本実施形態の石膏板の製造方法の第3の構成例について説明する。
石膏スラリーを成形する成形工程。
成形工程で得られた成形体を硬化させる硬化工程。
そして、混練工程では、第1の石膏スラリーと、第1の石膏スラリーよりも防蟻剤の含有量が少ない第2の石膏スラリーとの2種類の石膏スラリーを調製できる。
第1の端部領域、中央領域、及び第2の端部領域のいずれも防蟻剤を含有できる。そして、中央領域の防蟻剤の含有量を、第1の端部領域及び第2の端部領域の防蟻剤の含有量よりも少なくできる。
[実施例1]
図2に示した装置を用いて石膏ボードを製造し、該石膏ボード中に含まれる防蟻剤の含有量について評価を行った。
[比較例1]
防蟻剤を添加しない点以外については実施例1と同様にして石膏ボードを製造した。石膏ボードを製造した後、200mm×200mmのサイズにカットした石膏ボードの一方の表面カバー原紙及び他方のカバー原紙にそれぞれ防蟻剤(実施例1に同じ)0.33gを水中に分散させた分散液を塗布した。
[実施例2]
平均粒径が50μmの焼石膏100質量部に対して、防蟻剤(実施例1に同じ)0.0024質量部、凝結調整剤1質量部、減水剤0.3質量部、水80質量部の組成になるよう、市販のブレンダー(SANYO製 型番:SM-R50)を用いて混練し、石膏スラリー(石膏泥漿)を調製した。そして、該石膏スラリーを硬化させた石膏硬化体の比重が0.65となるように、泡を添加して石膏スラリーを調製した(混練工程)。
11 一方の表面
12 他方の表面
141 第1の端部領域
142 中央領域
143 第2の端部領域
Claims (5)
- 難水溶性の防蟻剤を石膏芯に含有する石膏板であって、
前記石膏芯を厚さ方向に沿って、一方の表面側から他方の表面側に向かって、厚さの等しい第1の端部領域、中央領域、及び第2の端部領域の3つの領域とした場合に、
前記第1の端部領域、前記中央領域、及び前記第2の端部領域のいずれも前記防蟻剤を含有し、
前記中央領域の前記防蟻剤の含有量が、前記第1の端部領域及び前記第2の端部領域の前記防蟻剤の含有量よりも少ない石膏板。 - 前記石膏芯1cm3当たりの防蟻剤含有量が0.1μg以上330μg以下である請求項1に記載の石膏板。
- 前記石膏芯1cm3当たりの防蟻剤含有量が0.1μg以上180μg以下である請求項1に記載の石膏板。
- 難水溶性の防蟻剤を石膏芯に含有する石膏板の製造方法であって、
少なくとも焼石膏、水、及び防蟻剤を含有する原料を混練し、石膏スラリーを形成する混練工程と、
前記石膏スラリーを成形する成形工程と、
前記成形工程で得られた成形体を硬化させる硬化工程と、を有し、
前記焼石膏の平均粒径が100μm以下、前記防蟻剤の平均粒径が50μm以下である石膏板の製造方法。 - 前記原料中の前記焼石膏の含有量と、前記防蟻剤の含有量との合計のうち、前記防蟻剤の含有割合は3.0×10-5質量%以上1.5×10-2質量%以下である請求項4に記載の石膏板の製造方法。
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BR112018011134B1 (pt) | 2022-07-12 |
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TW201725186A (zh) | 2017-07-16 |
JPWO2017104473A1 (ja) | 2018-10-18 |
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PH12018501238B1 (en) | 2019-02-11 |
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