WO2012077523A1 - 乾燥石膏組成物及び石膏系塗材 - Google Patents
乾燥石膏組成物及び石膏系塗材 Download PDFInfo
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- WO2012077523A1 WO2012077523A1 PCT/JP2011/077390 JP2011077390W WO2012077523A1 WO 2012077523 A1 WO2012077523 A1 WO 2012077523A1 JP 2011077390 W JP2011077390 W JP 2011077390W WO 2012077523 A1 WO2012077523 A1 WO 2012077523A1
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- gypsum
- coating material
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- hemihydrate
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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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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
- C09D1/06—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances cement
- C09D1/08—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances cement with organic additives
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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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/10—Acids or salts thereof containing carbon in the anion
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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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/12—Acids or salts thereof containing halogen in the anion
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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
- 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
- C04B28/145—Calcium sulfate hemi-hydrate with a specific crystal form
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/06—Inhibiting the setting, e.g. mortars of the deferred action type containing water in breakable containers ; Inhibiting the action of active ingredients
- C04B40/0608—Dry ready-made mixtures, e.g. mortars at which only water or a water solution has to be added before use
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
- C09D1/06—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances cement
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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
- C04B2111/00482—Coating or impregnation 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
- 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
- C04B2111/00482—Coating or impregnation materials
- C04B2111/00517—Coating or impregnation materials for masonry
Definitions
- the present invention relates to a dry gypsum composition and a gypsum-based coating material that can suppress the occurrence of color unevenness on a wall surface or the like formed of the material. More specifically, the present invention relates to a dry gypsum composition before adding water and a gypsum-based coating material kneaded with water, which are used for forming a colored wall surface containing a pigment.
- Gypsum-based coating materials generally include calcined gypsum (especially hemihydrate gypsum) as a main component, and various kinds of additives that are appropriately added to form a wall surface having a design or moisture absorption / release functionality. It has been commercialized as a dry gypsum composition comprising additives.
- gypsum-based wet coating material prepared by adding water to the dry gypsum composition and kneading it so as to be applied. It is applied on the base such as plasterboard using tools such as cocoons, and after hardening and drying, the wall surface is completed.
- dry gypsum compositions that are used by adding pigments of various colors are provided as products for the purpose of imparting design properties to gypsum-based coating materials used as finishing materials for interior walls.
- the wall surface made of these materials is finished with a wide variety of colors.
- the addition of the pigment required in this case is usually performed by a method of adding the pigment appropriately at the construction site.
- this method requires complicated construction work and it is difficult to mix the pigments uniformly.
- the dry gypsum composition which added the pigment of each color in the factory is also provided as a product for gypsum-type coating materials. According to the product, it is possible to avoid the trouble of mixing the pigment in the field, and furthermore, since the product is a stable and uniform mixture of the pigment, there is no unevenness by using the product.
- a uniform colored interior wall can be formed.
- these materials all contain gypsum as a filler, the main components thereof are inorganic powder, alumina cement, and the like, and the interior wall based on gypsum, which is a problem of the present invention. It is not a study of color unevenness on the coated surface formed using the dry gypsum composition used for the finishing material.
- the wet coating material based on gypsum is basically white that is close to pure white, and the problem of color unevenness is the color unevenness of conventional colored finishing materials mainly composed of the above materials. It is not something that can be identified, and new technical considerations are required.
- the wet coating material based on gypsum is completely different from the above-described prior art materials in color of the base material, and also has different curing characteristics (usable time, etc.). Of course, it is necessary to improve the problem of color unevenness after satisfying the working characteristics and curing characteristics peculiar to gypsum.
- the above pot life is a reaction-type gypsum-based coating material prepared by adding water to a dried gypsum composition and kneading it so that it can be applied to a wall. The time that can be applied by means
- an object of the present invention is to provide a gypsum-based coating material obtained by adding water to a gypsum-based dry gypsum composition that satisfies functions such as work characteristics and curing characteristics, and at the same time, provides a wall surface and the like.
- a dry gypsum composition and a gypsum-based coating material that are useful as a finishing material for interior walls and the like which, when formed, can suppress occurrence of color unevenness and can be uniformly colored and have excellent design. It is.
- the present invention comprises hemihydrate gypsum, at least one pigment, and a crystallization agent, and the crystallization agent comprises a sulfate, a carboxylate, a carbonate, and an inorganic chloride.
- the hemihydrate gypsum is hydrated by being in the range of 0.1 to 5 parts by mass with respect to 100 parts by mass of the above-mentioned hemihydrate gypsum.
- a dry gypsum composition characterized in that the dihydrate gypsum is controlled to form plate crystals having an aspect ratio of 1 to 9.
- the present invention is also a gypsum-based coating material capable of suppressing the occurrence of color unevenness, comprising water, hemihydrate gypsum, at least one pigment, and a crystallization agent.
- a gypsum-based coating material capable of suppressing the occurrence of color unevenness, comprising water, hemihydrate gypsum, at least one pigment, and a crystallization agent.
- the gypsum-based coating is characterized in that the dihydrate gypsum when the hemihydrate gypsum is hydrated is controlled to form plate crystals having an aspect ratio of 1 to 9. Providing materials.
- Preferred examples of the above-described dry gypsum composition or gypsum-based coating material of the present invention include the following. At least one selected from the group consisting of aluminum sulfate, potassium sulfate, magnesium sulfate, sodium succinate, sodium tartrate, calcium maleate, magnesium carbonate, sodium carbonate, potassium carbonate, sodium chloride and magnesium chloride Be a compound. Furthermore, the pot life is 60 minutes or more and 120 minutes or less. In addition, contain rosin. Furthermore, a hydrazide compound is included.
- a dry gypsum composition based on gypsum when kneaded with water to form a wet coating material, it satisfies functions such as work characteristics and curing characteristics, and at the same time, a wall surface and the like.
- a dry gypsum composition and a gypsum-based coating material that can be effectively used as a finishing material for interior walls and the like that can be made excellent in design with a uniform coloring with reduced color unevenness when formed. Is provided.
- hemihydrate gypsum refers to one obtained by firing dihydrate gypsum.
- hemihydrate gypsum There are two types of hemihydrate gypsum: ⁇ -type hemihydrate gypsum and ⁇ -type hemihydrate gypsum.
- ⁇ -type hemihydrate gypsum is included in the constituent material ( ⁇ -type hemihydrate gypsum). It is preferable that the content of water gypsum is 50% by mass or more. In order to improve the strength when used as a wall finishing material, it is also preferable to use a mixture of ⁇ -type hemihydrate gypsum and ⁇ -type hemihydrate gypsum in the proportions described below as a hemihydrate gypsum material.
- the surface of the finishing material having pigments may become uneven due to external factors such as uneven water absorption of the base.
- a reaction-curing type finishing material such as a gypsum system based on gypsum, which is the subject of the present invention
- an unreacted part (dryout generated due to the absorption of moisture in the coating material for the top coat) Rarely, color unevenness occurs between the portion) and the reaction completion portion.
- the following methods are known as general techniques for preventing dry-out, which is considered to contribute to the occurrence of color unevenness.
- a primer or a curing agent is applied to the base to adjust the water absorption of the gypsum-based coating applied on the base and prevent dryout. It is a method to do. However, this method has a practical problem of increasing the construction period because the number of steps for applying the base conditioning material or the like increases.
- Another method is to add a water retention agent such as methylcellulose to increase the water retention of the gypsum-based coating material and prevent the occurrence of dryout.
- the addition of a water retention agent is an effective method from the viewpoint of ensuring a long pot life.
- a gypsum-based coating material which is a material for forming a colored wall surface containing a pigment based on gypsum, has a uniform and uniform coloring without color unevenness and is excellent in design.
- the inventors have found the following and have reached the present invention.
- the dry gypsum composition of the present invention containing a specific amount of the specific crystallizing agent specified in the present invention is a mixture of water and the main component hemihydrate gypsum is water.
- the phase changes to dihydrate gypsum, and the aspect ratio of the crystal shape becomes 1-9.
- the aspect ratio is 3 to 8.
- the inventors of the present invention define a sulfate salt such as aluminum sulfate in a gypsum-based coating material containing a pigment and hemihydrate gypsum kneaded with water. It was found that the problem of color unevenness can be solved by adding a predetermined amount within the range. Furthermore, it has been found that the same effect can be obtained by addition of carboxylate, carbonate and inorganic chloride.
- Aluminum sulfate is conventionally used for the purpose of shortening the termination time of gypsum and improving hydration properties.
- the pot life is reduced without shortening the pot life. It can be shortened and dry out is suppressed.
- the dry gypsum composition added with aluminum sulfate in the above-mentioned specific amount was kneaded with water to form a wet coating material, the crystal shape when the gypsum hydrates can be controlled. It was. More specifically, in the conventional product, when water was added to the dry gypsum composition prior to application and hydrated, needle crystals with a large aspect ratio were formed. When added in an amount within the range specified in the present invention, the compound functions as a crystal clearing agent and becomes a plate crystal having a small aspect ratio.
- the present inventors consider the reason why the occurrence of color unevenness on the formed wall surface or the like is suppressed by the above configuration as follows. That is, in the conventional finishing coating material, as shown schematically in FIG. 2, the hemihydrate gypsum is hydrated while the pigment remains in the recesses of the crystal formed by hydration. When the dry gypsum composition of the present invention in which the crystallizing agent is added within a specific amount is used, the crystal shape when the gypsum is hydrated by being kneaded with water is controlled, and there are no recesses. become. The present inventors believe that the above is the reason why the occurrence of color unevenness can be suppressed.
- the third substance adsorbs and coats the surface of the solid phase (hemihydrate gypsum) to grow crystals.
- the presence of this third substance suppresses growth in the C-axis direction, which has a particularly high growth rate.
- the addition amount is within the range of a small amount specified in the present invention, a plate-like crystal having a small aspect ratio, specifically, an aspect ratio of 1 to 9, can be created. A crystal having a small surface area is obtained, and as a result, it is considered that the remarkable effect of the present invention can be obtained.
- a compound selected from the group consisting of sulfates, carboxylates, carbonates and inorganic chlorides can be used.
- the sulfate include aluminum sulfate, potassium sulfate, magnesium sulfate and the like.
- the carboxylate include sodium succinate, sodium tartrate, calcium maleate and the like.
- the carbonate include magnesium carbonate, sodium carbonate, potassium carbonate and the like.
- the inorganic salt include sodium chloride and magnesium chloride.
- sulfates such as aluminum sulfate, potassium sulfate, and magnesium sulfate are preferable.
- crystallizing agents need to be externally added in the range of 0.1 to 5 parts by mass with respect to 100 parts by mass of hemihydrate gypsum.
- the optimum range of the addition amount varies depending on the type of crystallizing agent, but may be determined based on the balance between the end time and the pot life.
- a sulfate such as aluminum sulfate or potassium sulfate
- the addition amount of the crystallizing agent is too small, the effect of suppressing the occurrence of color unevenness cannot be obtained sufficiently, and the end time becomes longer, resulting in a reduction in work efficiency.
- the addition amount of the crystallizing agent is too large, the hydration of the gypsum coating material proceeds rapidly, and another problem arises that the pot life cannot be secured.
- pigments examples include the following inorganic pigments or organic pigments having various colors.
- inorganic pigments include oxides such as zinc oxide, iron oxide, titanium dioxide and chromium oxide, hydroxides such as alumina and iron oxide yellow, chromates such as chrome lead and zinc chromate, silica such as talc and ultramarine blue. Acid salts, carbonates such as calcium carbonate and lead white, carbon black, phosphates and the like can be appropriately used.
- As the organic pigment azo pigments, nitro pigments, nitroso pigments, phthalocyanine pigments, condensed polycyclic pigments and the like can be used in predetermined amounts. Lake pigments can also be used. However, the present invention is not limited to these.
- the “pot life” refers to “time during which application work can be performed while maintaining good workability”, but the gypsum-based coating material of the present invention has the pot life from the practical viewpoint. Is preferably 60 minutes or more and 120 minutes or less. If the pot life is less than 60 minutes, there is a possibility that the gypsum-based coating material may be hardened before finishing the application work depending on the case, so that it is not preferable. On the other hand, if the pot life exceeds 120 minutes, it takes too much time for curing, which is not preferable because the next work may not be performed.
- the dry gypsum composition of the present invention is mainly composed of hemihydrate gypsum.
- ⁇ -type hemihydrate gypsum is the main material in the constituent material (the content ratio of ⁇ -type hemihydrate gypsum is (50% by mass or more) is preferable.
- a mixture of ⁇ -type hemihydrate gypsum: ⁇ -type hemihydrate gypsum in a ratio of 30: 1 to 2: 1 should be used.
- the dry gypsum composition of the present invention there may be mentioned a constitution in which an aggregate, diatomaceous earth and other additives are further added to the hemihydrate gypsum material which is the main component.
- the blending amount of hemihydrate gypsum, aggregate, and / or diatomaceous earth in the dry gypsum composition in such an embodiment is preferably as follows. That is, when the entire dry gypsum composition is 100 parts by mass, it is preferable that hemihydrate gypsum is 80 parts by mass or more, and the total amount of aggregate and diatomaceous earth is 20 parts by mass or less.
- an aggregate may be contained in addition to hemihydrate gypsum, and only diatomaceous earth may be contained.
- the aggregate used in the present invention for example, calcium carbonate or the like can be used.
- additives used in the dry gypsum composition of the present invention conventionally known additives for wet coating materials such as an accelerator and a retarder can be used.
- the dry gypsum composition or gypsum-based coating material of the present invention is preferably in a form having formaldehyde adsorption / decomposition performance.
- a hydrazide compound may be added to impart the above function.
- the amount of the hydrazide compound added is preferably 0.1 to 10 parts by mass with respect to 100 parts by mass of hemihydrate gypsum.
- the water mixing ratio is, for example, 50% to 100%, preferably 60 to 70% on a mass basis. Good.
- the dry gypsum composition or gypsum-based coating material of the present invention may further contain rosin.
- the amount of rosin added is preferably 0.3 to 3 parts by mass with respect to 100 parts by mass of hemihydrate gypsum.
- rosin By including rosin, the formed interior walls and the like are provided with appropriate water repellency.
- the chromaticity of the surface of the cured product obtained above was measured with a color difference meter (trade name: Color Meter ZE-2000, manufactured by Nippon Denshoku Industries Co., Ltd.), and the occurrence of color unevenness was evaluated by the following method.
- the results are shown in Table 1 as “color unevenness determination”.
- Color unevenness determination By visually observing the two cured bodies obtained above, select one cured body with no apparent color unevenness, and determine the chromaticity of the surface colored with the chromaticity meter for the selected cured body. It was measured. Then, the chromaticity range of the reference color was defined, and each evaluation sample was evaluated using this reference value. Specifically, it was performed as follows.
- the L value: 65.2 ⁇ 3 the a value: 2.35 from the chromaticity of the cured product that can be judged that the water of the gypsum-based coating material was not excessively absorbed by the base and was clearly uniformly terminated.
- ⁇ 0.3 and b value: 18.9 ⁇ 0.5 were defined as the chromaticity range of the reference color.
- the chromaticity of the surface was measured with the chromaticity meter about the sample for evaluation (cured body) obtained in advance with different compositions and conditions for producing the cured body.
- each measured value obtained is compared with the reference value determined above, and the case where the measured chromaticity is within the range of the reference color is indicated as ⁇ , and the case where the measured chromaticity is outside the range of the reference color. It evaluated as x.
- the obtained evaluation results are shown in Table 1 as “color unevenness determination”.
- the pot life was measured for each of the gypsum-based coating materials of Examples and Comparative Examples obtained above and evaluated according to the following criteria. First, water was added to each dry gypsum composition and kneaded so that it could be applied to the wall. And about each gypsum-type coating material, the time which can be apply
- the evaluation criteria were a gypsum-based coating material having a pot life of 60 minutes or more as “ ⁇ ” and a gypsum-based coating material having a pot life of less than 60 minutes as “x”. The obtained evaluation results are shown in Table 1 as “judgment time determination”.
- the specific surface area was calculated
- the measurement principle is the specific surface area (m 2 / ml) assuming that the particles are all spherical.
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Abstract
Description
一般的に、壁用仕上げ材は、大きく分けて、反応硬化型と乾燥硬化型の2つのタイプがあるが、石膏系塗材は、半水石膏を用い、水を加えることで水和反応が起こり、半水石膏が二水石膏へと相変化して硬化する反応硬化型である。ここで、本発明において、「半水石膏」とは、二水石膏を焼成したものをいう。半水石膏には、α型半水石膏とβ型半水石膏とがあるが、本発明の乾燥石膏組成物では、特に、その構成材料中にβ型半水石膏が主材(β型半水石膏の含有率が50質量%以上)となるように構成することが好ましい。壁用仕上げ材として用いた場合における強度改善のため、β型半水石膏にα型半水石膏を下記に挙げるような比率で混合したものを半水石膏材料として用いることも好ましい形態である。例えば、本発明に好適な半水石膏材料としては、両者の混合比率が、質量基準で、β型半水石膏:α型半水石膏=30:1、好ましくは20:1、より好ましくは15:1の比率のものが挙げられる。
(半水石膏の調製)
実施例及び比較例で用いる半水石膏として、β型半水石膏とα型半水石膏とを、質量基準で両者の比が、β型半水石膏:α型半水石膏=15:1の比率となるように混合した材料を用意した。
上記のように調製した半水石膏100部に、顔料として酸化鉄(茶色系)を1部と、媒晶剤として、表1に示した化合物を、表1に示した量でそれぞれ添加し、混合機で十分に混合撹拌して、実施例1~13、比較例1~3の各乾燥石膏組成物をそれぞれ得た。なお、上記乾燥石膏組成物は、炭酸カルシウム10質量部と珪藻土8質量部とをさらに含んでいる。
(1)色ムラの発生
上記で得た実施例或いは比較例の各乾燥石膏組成物に、混水率62%の水を加えて混練し、実施例或いは比較例の各石膏系塗材とした。得られた各塗材を用い、30cm×30cmの石膏ボード(ボード厚さ=9.5mm)表面に、3mmの厚さで塗り付け、硬化させて表面が彩色された硬化体をそれぞれ2枚ずつ得た。得られた試験体をドライアウトしないよう硬化するまで養生した。硬化後、40℃の乾燥器内で、24時間養生して、それぞれ評価用試料とした。
上記で得た実施例或いは比較例の各石膏系塗材について、下記のようにして、それぞれ可使時間を測定し、下記の基準で評価した。まず、各乾燥石膏組成物に水を加えて混練し、壁に塗布できるように調整した。そして、各石膏系塗材について、鏝等によって良好な状態で塗布作業ができる時間を測定し、これを可使時間とした。評価基準は、可使時間が60分以上の石膏系塗材を○とし、60分未満の石膏系塗材を×とした。得られた評価結果を、「可使時間の判定」として表1に示した。
上記(1)の「色ムラの判定」で作製した各硬化体のアスペクト比を測定した。具体的には、各硬化体をSEM撮影し、一つの硬化体につき、結晶アスペクト比の測定個所を任意で10箇所選択し、それぞれ測定した。得られたアスペクト比の平均値を各硬化体のアスペクト比とした。結果を表中「アスペクト比」の欄に示した。表1に、測定結果をそれぞれ示した。
測定機器として、MICROTRAC HRA(日機装株式会社製)を用いて比表面積を求めた。測定原理は、粒子をすべて球形と仮定した場合の比表面積(m2/ml)である。
「総合判定」は、下記の基準で評価した。すなわち、上記した「可使時間の判定」と「色ムラ判定」の両方で「○」であったものを「○」とし、いずれかの判定で「×」とされた場合を「×」として評価した。
2:顔料
Claims (6)
- 半水石膏と、少なくとも1種の顔料と、媒晶剤とを含有してなり、該媒晶剤が、硫酸塩、カルボン酸塩、炭酸塩及び無機塩化物からなる群から選択された少なくとも1種の化合物であり、且つ、その添加量が、上記半水石膏100質量部に対して0.1~5質量部の範囲であることで、半水石膏が水和した際の二水石膏が、アスペクト比1~9の板状結晶となるようにコントロールされていることを特徴とする乾燥石膏組成物。
- 色ムラの発生が抑制できる石膏系塗材であって、水と、半水石膏と、少なくとも1種の顔料と、媒晶剤とを含有してなり、該媒晶剤が、硫酸塩、カルボン酸塩、炭酸塩及び無機塩化物からなる群から選択された少なくとも1種の化合物であり、且つ、その添加量が、上記半水石膏100質量部に対して0.1~5質量部の範囲であることで、半水石膏が水和した際の二水石膏が、アスペクト比1~9の板状結晶となるようにコントロールされていることを特徴とする石膏系塗材。
- 前記媒晶剤が、硫酸アルミニウム、硫酸カリウム、硫酸マグネシウム、コハク酸ナトリウム、酒石酸ナトリウム、マレイン酸カルシウム、炭酸マグネシウム、炭酸ナトリウム、炭酸カリウム、塩化ナトリウム及び塩化マグネシウムからなる群から選択された少なくとも1種の化合物である請求項2に記載の石膏系塗材。
- その可使時間が、60分以上且つ120分以下である請求項2又は3に記載の石膏系塗材。
- さらに、ロジンを含む請求項2~4のいずれか1項に記載の石膏系塗材。
- さらに、ヒドラジド化合物を含む請求項2~5のいずれか1項に記載の石膏系塗材。
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GB201420766D0 (en) * | 2014-11-21 | 2015-01-07 | Bpb United Kingdom Ltd | Fire resistant calcium sulphate-based products |
GB201420768D0 (en) | 2014-11-21 | 2015-01-07 | Bpb United Kingdom Ltd | Calcium sulphate-based products |
GB201420767D0 (en) | 2014-11-21 | 2015-01-07 | Bpb United Kingdom Ltd | Fire resistant calcium sulphate-based products |
CN105859236A (zh) * | 2016-03-31 | 2016-08-17 | 安徽森科新材料有限公司 | 一种抗静电地板干法石膏胶凝基材及其制备方法 |
CN106830866B (zh) * | 2017-01-18 | 2019-05-14 | 贵州蓝图新材料股份有限公司 | 防水型磷石膏砌块及其制备方法 |
JP6853775B2 (ja) * | 2017-12-21 | 2021-03-31 | 住友林業株式会社 | 貫通部用耐火被覆材 |
CN111606590B (zh) * | 2019-03-01 | 2022-04-19 | 中建材创新科技研究院有限公司 | 一种控制磷石膏晶形的方法及其应用 |
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KR102437358B1 (ko) * | 2022-05-04 | 2022-08-30 | 한란 | 공예용 기능성 석고 조성물 |
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US20130199418A1 (en) | 2013-08-08 |
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