JP2000007463A - Formation of inorganic foamed molding or coating film and inorganic composition - Google Patents
Formation of inorganic foamed molding or coating film and inorganic compositionInfo
- Publication number
- JP2000007463A JP2000007463A JP17174898A JP17174898A JP2000007463A JP 2000007463 A JP2000007463 A JP 2000007463A JP 17174898 A JP17174898 A JP 17174898A JP 17174898 A JP17174898 A JP 17174898A JP 2000007463 A JP2000007463 A JP 2000007463A
- Authority
- JP
- Japan
- Prior art keywords
- inorganic
- composition
- molding
- inorganic composition
- coating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、無機質発泡成形体
または無機質発泡被覆を形成する方法、及びそれらの成
形体または被覆の材料として適した無機組成物に関する
ものである。The present invention relates to a method for forming an inorganic foam molded article or an inorganic foam coating, and an inorganic composition suitable as a material for the molded article or the coating.
【0002】[0002]
【従来の技術】発泡体、すなわち、多数の気泡が互いに
隔壁によって仕切られて分散した状態で含まれる成形体
または被覆は、軽量で、断熱性等に優れ、建材の裏打ち
材あるいはコア材を始めとして種々の分野で利用されて
いる。そして、このような発泡体としては、ポリスチレ
ンやポリウレタン等の合成樹脂からなる有機質の発泡体
が一般的であるが、特に近年では、耐火性あるいは防火
性の点からも、バインダ成分を含めて無機質材料のみか
ら実質的に形成された不燃で、耐熱性が高い無機質発泡
体に対する要求が高まっている。2. Description of the Related Art Foams, that is, molded articles or coatings containing a large number of cells dispersed and separated from each other by partition walls, are lightweight, have excellent heat insulating properties, etc., and include a backing material or a core material for building materials. Is used in various fields. As such a foam, an organic foam made of a synthetic resin such as polystyrene or polyurethane is generally used, but in recent years, in particular, in view of fire resistance or fire resistance, inorganic foam including a binder component has been used. There is an increasing demand for non-combustible, highly heat-resistant inorganic foams substantially formed from only materials.
【0003】その一方、このような無機質発泡体を形成
する方法については、従来より種々の方法が知られ、ま
た提案されている。最も代表的な方法は、セメント等の
無機バインダを含む水性無機組成物に予め空気を混入し
て、気泡として含ませた状態でその組成物を固化する方
法である。また、直接的な無機質発泡体の形成方法では
ないが、シラスバルーン等の発泡(中空)無機質粒子を
用い、これをその組成物に比較的多量に配合する方法も
一般的である。On the other hand, various methods for forming such an inorganic foam have been conventionally known and proposed. The most typical method is a method in which air is mixed in advance with an aqueous inorganic composition containing an inorganic binder such as cement, and the composition is solidified in a state where the composition is contained as bubbles. Although not a method of directly forming an inorganic foam, it is also common to use foamed (hollow) inorganic particles such as shirasu balloons and blend them into the composition in a relatively large amount.
【0004】また、外部空気を組成物中に気泡として導
入する上記の方法に代え、化学的反応または熱分解等に
よってガスを発生する発泡剤を用い、これを組成物中で
発泡させて気泡を生成する方法も知られている。そし
て、例えば、特開平7−291757号には、アルカリ
金属ケイ酸塩の水溶液(水ガラス)をバインダとし、特
定のフライアッシュを含む充填材(兼硬化剤)を使用し
た無機組成物に、発泡剤としてアルミニウム粉末を加え
たものが開示されている。このアルミニウム粉末は、バ
インダのアルカリ性によって水素ガスを発生して発泡す
る。Further, instead of the above-described method of introducing external air into the composition as air bubbles, a foaming agent that generates a gas by a chemical reaction or thermal decomposition is used, and this is foamed in the composition to form air bubbles. Methods of generating are also known. For example, Japanese Patent Application Laid-Open No. 7-291557 discloses that an inorganic composition using an aqueous solution (water glass) of an alkali metal silicate as a binder and a filler (also a curing agent) containing a specific fly ash is used. An addition of an aluminum powder as an agent is disclosed. The aluminum powder generates hydrogen gas due to the alkalinity of the binder and foams.
【0005】なお、その他にも、無機質発泡体の形成方
法に関しては、加熱によって急激に体積膨張して気泡を
形成する特殊な鉱物質材料を使用したものも知られてい
る。すなわち、本出願人の提案に係るものであるが、特
開平6−172058号には、水ガラスをバインダとす
る無機組成物に、そのような加熱膨張性材料である合成
膨潤性雲母または合成スメクタイト(粉末)を配合し、
これを乾燥固化( ゲル化)した後、400乃至500℃
の温度で加熱して発泡体を形成することが開示されてい
る。[0005] In addition, as for a method of forming an inorganic foam, a method using a special mineral material which rapidly expands in volume by heating to form air bubbles is also known. That is, according to the proposal of the present applicant, Japanese Patent Application Laid-Open No. 6-172058 discloses that an inorganic composition using water glass as a binder is provided with such a heat-swellable material such as synthetic swellable mica or synthetic smectite. (Powder)
After drying and solidifying (gelling), it is 400 ~ 500 ℃
To form a foam by heating at a temperature of
【0006】[0006]
【発明が解決しようとする課題】ところで、発泡体は、
無機質であるか有機質であるかを問わず、その均質性が
重要である。しかし、上述したいずれの従来技術に従っ
て無機質発泡体を形成した場合にも、1つ1つの気泡を
所望の大きさにすること、すなわち、気泡中の空気やガ
スの量をコントロールすることが困難である。従って、
気泡の大きさが不揃いとなり、場合によっては、気泡が
隣の気泡と合体して大きな気泡となる。その結果、得ら
れた無機質発泡体では、断熱性、比重等といった各種特
性のばらつきが大きくなるという不具合がある。By the way, the foam is
Its homogeneity, whether inorganic or organic, is important. However, even when the inorganic foam is formed according to any of the above-mentioned conventional techniques, it is difficult to make each cell a desired size, that is, to control the amount of air or gas in the cell. is there. Therefore,
The size of the bubbles becomes irregular, and in some cases, the bubbles merge with the adjacent bubbles to become large bubbles. As a result, in the obtained inorganic foam, there is a problem that variations in various properties such as heat insulation properties and specific gravity are increased.
【0007】そこで、本発明は、互いに独立し、かつ大
きさの揃った多数の気泡を含む無機質発泡成形体または
被覆を容易かつ確実に形成できる方法を提供することを
課題としている。また、本発明は、無機質発泡成形体ま
たは無機質発泡被覆の材料として適した無機組成物を提
供することも課題としている。Accordingly, an object of the present invention is to provide a method for easily and reliably forming an inorganic foam molded article or a coating containing a large number of cells which are independent of each other and have a uniform size. Another object of the present invention is to provide an inorganic composition suitable as a material for an inorganic foam molded article or an inorganic foam coating.
【0008】[0008]
【課題を解決するための手段】請求項1に記載の第1の
発明は、アルカリ金属ケイ酸塩の水溶液からなるバイン
ダと、卵殻の微細粉砕物である卵殻粉とを含む無機組成
物を賦形成形するとともに、その無機組成物を乾燥固化
して予備成形体を形成する予備成形体形成工程と、前記
予備成形体を加熱し、発泡させることにより無機質発泡
成形体を形成する発泡成形工程とを備える、無機質発泡
成形体の形成方法を要旨としている。According to a first aspect of the present invention, there is provided an inorganic composition comprising a binder comprising an aqueous solution of an alkali metal silicate and eggshell powder which is a finely ground egg shell. While forming and forming, a preformed body forming step of drying and solidifying the inorganic composition to form a preformed body, and a foaming forming step of heating the preformed body and foaming to form an inorganic foamed molded body. A method for forming an inorganic foam molded article, comprising:
【0009】ここで、アルカリ金属ケイ酸塩は一般式M
2 O・nSiO2 で表される。式中、Mはナトリウム
(Na)、カリウム(K)、またはリチウム(Li)で
ある。また、nはM2 OとSiO2 とのモル比であり、
一般に0.5乃至4.5である。このようなアルカリ金
属ケイ酸塩としては、安価で入手が容易なケイ酸ナトリ
ウムの水ガラスを好適に用いることができる。Here, the alkali metal silicate has the general formula M
It is represented by 2 O · nSiO 2 . Wherein M is sodium (Na), potassium (K), or lithium (Li). N is the molar ratio between M 2 O and SiO 2 ,
Generally, it is 0.5 to 4.5. As such an alkali metal silicate, water glass of sodium silicate which is inexpensive and easily available can be suitably used.
【0010】また、バインダには必要に応じて硬化剤や
充填材が配合され、さらにはこれらが水に溶解されてス
ラリー状をなしていてもよい。硬化剤としては、例え
ば、酸化マグネシウム、酸化鉛、酸化亜鉛、酸化カルシ
ウム等の多価金属の酸化物、ケイ酸カルシウム等の珪化
物(ケイ酸塩)、珪弗化ナトリウム等の珪弗化物、リン
酸アルミニウム等のリン酸塩、リン酸と金属酸化物との
焼成物、あるいはその複塩、ホウ酸ナトリウムまたはカ
リウム、ホウ酸亜鉛等のホウ酸塩等が使用される。ま
た、充填材としては、例えば、シリカ粉、カオリン、雲
母粉、炭酸カルシウム、セピオライト等が使用される。[0010] The binder may contain a curing agent and a filler as required, and these may be dissolved in water to form a slurry. Examples of the curing agent include oxides of polyvalent metals such as magnesium oxide, lead oxide, zinc oxide, and calcium oxide; silicides (silicates) such as calcium silicate; silicides such as sodium silicofluoride; Phosphates such as aluminum phosphate, calcined products of phosphoric acid and metal oxide, or double salts thereof, and borates such as sodium or potassium borate and zinc borate are used. As the filler, for example, silica powder, kaolin, mica powder, calcium carbonate, sepiolite, and the like are used.
【0011】卵殻粉は卵白と卵黄を除去した鳥卵(主に
鶏卵)等の卵殻を微粉砕したものであり、例えば、10
μm乃至20μm程度の平均粒径を有し、微細な空孔を
有している。卵殻粉は主に炭酸カルシウム(CaCO
3 )からなり、その他少量のリン酸カルシウム、ケイ酸
塩及び微量の硬たんぱく質(ケラチン)を含んでいる。[0011] Eggshell powder is obtained by finely pulverizing eggshell such as chicken eggs (mainly chicken eggs) from which albumen and yolk have been removed.
It has an average particle size of about 20 μm to 20 μm and has fine pores. Eggshell powder is mainly calcium carbonate (CaCO
3 ) and contains a small amount of calcium phosphate, silicate and a small amount of hard protein (keratin).
【0012】乾燥は、賦形成形された無機組成物が発泡
を起こさないように水分を除去するための処理である。
乾燥には、放置して自然乾燥させる処理や、無機組成物
が発泡する温度よりも低い温度で加熱する処理が含まれ
る。無機質発泡成形体は、発泡した状態で一定形状に形
作られたものである。Drying is a treatment for removing water so that the formed inorganic composition does not foam.
Drying includes a treatment of allowing the composition to dry naturally and a treatment of heating at a temperature lower than the temperature at which the inorganic composition foams. The inorganic foam molded article is formed into a certain shape in a foamed state.
【0013】上記第1の発明によると、無機質発泡成形
体の形成に際し、予備成形体形成工程及び発泡成形工程
が行われる。予備成形体形成工程では、アルカリ金属ケ
イ酸塩の水溶液からなるバインダと、卵殻の微細粉砕物
である卵殻粉とを含む無機組成物が用いられる。この無
機組成物は、型等に注入される等して、所定の形状に賦
形される。そして、無機組成物中の水分が乾燥により除
去されると、その無機組成物は固化し、所定形状の予備
成形体となる。この段階では、予備成形体中には気泡が
含まれていない。According to the first aspect of the present invention, a preform forming step and a foaming step are performed when forming the inorganic foamed article. In the preform forming step, an inorganic composition including a binder composed of an aqueous solution of an alkali metal silicate and eggshell powder that is a finely crushed eggshell is used. The inorganic composition is formed into a predetermined shape by being injected into a mold or the like. Then, when the water in the inorganic composition is removed by drying, the inorganic composition solidifies and becomes a preform having a predetermined shape. At this stage, no bubbles are contained in the preform.
【0014】続く発泡成形工程では予備成形体が加熱さ
れる。加熱温度はアルカリ金属ケイ酸塩の種類によって
異なるが、例えばケイ酸ナトリウムの場合には、120
℃以上であることが望ましい。これよりも低い温度で加
熱しても、均質な発泡が行われないからである。この加
熱により、予備成形体中のアルカリ金属ケイ酸塩と卵殻
粉とが反応する。すなわち、各卵殻粉が核となり、卵殻
粉の一成分であるたんぱく質が分解してガス化し、多数
の気泡を生ずる。ここで、卵殻粉の粒径が揃っており、
1個当りの卵殻粉から単位時間当りに発生するガスの量
は、卵殻粉間で同程度である。加えて、たんぱく質の分
解及びガス化はゆっくり行われるので、大きな気泡とな
る前にバインダが硬化する。その結果、互いに独立し
(隣の気泡に合体しておらず)、かつ微細で大きさの揃
った多数の気泡を含んだ無機質発泡成形体が得られる。In the subsequent foaming step, the preform is heated. The heating temperature varies depending on the type of the alkali metal silicate.
It is desirable that the temperature is not less than ° C. This is because, even if heating is performed at a lower temperature, uniform foaming is not performed. By this heating, the alkali metal silicate in the preform reacts with the eggshell powder. That is, each eggshell powder becomes a nucleus, and a protein which is a component of the eggshell powder is decomposed and gasified to generate a large number of bubbles. Here, the particle size of the eggshell powder is uniform,
The amount of gas generated per unit time from eggshell powder per piece is almost the same between eggshell powder. In addition, the decomposition and gasification of the protein occurs slowly so that the binder hardens before becoming large bubbles. As a result, an inorganic foam molded article that is independent of each other (not coalesced with adjacent cells) and includes many fine and uniform cells is obtained.
【0015】請求項2に記載の第2の発明は、アルカリ
金属ケイ酸塩の水溶液からなるバインダと、卵殻の微細
粉砕物である卵殻粉とを含む無機組成物を基体表面にコ
ーティングし、次いでその無機組成物を乾燥固化して発
泡性の無機質被覆を形成した後、その無機質被覆を加熱
して発泡させる、無機質発泡被覆の形成方法を要旨とし
ている。ここで、アルカリ金属ケイ酸塩、卵殻粉及び乾
燥は第1の発明で説明したものと同様である。無機質発
泡被覆は、発泡した状態で対象物(基体)に覆い被さっ
たものである。A second invention according to claim 2 is to coat an inorganic composition containing a binder composed of an aqueous solution of an alkali metal silicate and an eggshell powder, which is a finely ground egg shell, on a substrate surface, The gist of the present invention is a method for forming an inorganic foamed coating, in which after the inorganic composition is dried and solidified to form a foamable inorganic coating, the inorganic coating is heated and foamed. Here, the alkali metal silicate, the eggshell powder and the drying are the same as those described in the first invention. The inorganic foam coating covers an object (substrate) in a foamed state.
【0016】上記第2の発明によると、無機質発泡被覆
の形成に際し、まず無機組成物が基体の表面にコーティ
ングされる。この無機組成物は、アルカリ金属ケイ酸塩
の水溶液からなるバインダと、卵殻の微細粉砕物である
卵殻粉とを含んでいる。続いて、無機組成物中の水分が
乾燥により除去される。この水分除去により無機組成物
が固化し、基体上に加熱発泡性の無機質被覆が形成され
る。この段階では無機質被覆は気泡を含んでいないが、
熱が加えられると第1の発明と同様に反応し、多数の独
立した気泡を有する無機質発泡被覆となる。According to the second aspect of the invention, when forming the inorganic foam coating, first, the inorganic composition is coated on the surface of the substrate. This inorganic composition contains a binder composed of an aqueous solution of an alkali metal silicate, and eggshell powder that is a finely ground egg shell. Subsequently, moisture in the inorganic composition is removed by drying. This moisture removal solidifies the inorganic composition and forms a heat-foamable inorganic coating on the substrate. At this stage, the inorganic coating contains no air bubbles,
When heat is applied, it reacts in the same manner as in the first invention, resulting in an inorganic foam coating having a large number of independent cells.
【0017】請求項3に記載の第3の発明は、アルカリ
金属ケイ酸塩の水溶液からなるバインダと、卵殻の微細
粉砕物である卵殻粉とを含む無機組成物を要旨としてい
る。ここで、アルカリ金属ケイ酸塩及び卵殻粉は第1の
発明で説明したものと同様である。A third aspect of the present invention is directed to an inorganic composition comprising a binder comprising an aqueous solution of an alkali metal silicate and an eggshell powder which is a finely ground egg shell. Here, the alkali metal silicate and the eggshell powder are the same as those described in the first invention.
【0018】上記第3の発明によると、無機組成物は非
加熱下(例えば常温下)では反応しない。そのため、無
機組成物を所定の形状に賦形したり、基体表面にコーテ
ィングしたりし、その無機組成物を乾燥固化させること
が可能である。乾燥固化した無機組成物には気泡は含ま
れていない。しかし、無機組成物が加熱されると、アル
カリ金属ケイ酸塩及び卵殻粉が反応してガスが発生さ
れ、多数の気泡が生ずる。バインダが硬化すると、互い
に独立し、かつ微細で大きさの揃った多数の気泡を含ん
だ無機質発泡成形体または無機質発泡被覆が得られる。According to the third aspect, the inorganic composition does not react under non-heating (for example, at normal temperature). Therefore, it is possible to shape the inorganic composition into a predetermined shape, coat the inorganic composition on the surface of the substrate, and dry and solidify the inorganic composition. Air bubbles are not contained in the dried and solidified inorganic composition. However, when the inorganic composition is heated, the alkali metal silicate and the eggshell powder react to generate gas and generate numerous bubbles. When the binder cures, an inorganic foam molded article or an inorganic foam coating containing a large number of cells that are independent of each other and are fine and uniform in size are obtained.
【0019】[0019]
【実施例】(第1実施例)以下、第1及び第3の発明を
具体化した第1実施例について説明する。アルカリ金属
ケイ酸塩の水溶液として、固形分40%程度のケイ酸ナ
トリウム水溶液を用いた。又、卵殻粉として平均粒径1
0μmを有するものを用い、さらに、充填材としてマイ
カを用いた。常温下で容器にケイ酸ナトリウム水溶液1
00重量部を入れ、ここに10重量部の卵殻粉及び5重
量部のマイカを添加した。撹拌により卵殻粉とマイカを
前記水溶液に分散させて無機組成物を作成した。この無
機組成物を用い、次に示す予備成形体形成工程及び発泡
成形工程を順に行い、無機質発泡成形体を形成した。DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment embodying the first and third inventions will be described below. As the aqueous solution of the alkali metal silicate, an aqueous solution of sodium silicate having a solid content of about 40% was used. Moreover, the average particle size is 1 as eggshell powder.
One having a thickness of 0 μm was used, and mica was used as a filler. Sodium silicate aqueous solution 1 in a container at room temperature
Then, 10 parts by weight of eggshell powder and 5 parts by weight of mica were added. Eggshell powder and mica were dispersed in the aqueous solution by stirring to prepare an inorganic composition. Using this inorganic composition, the following preformed body forming step and foam forming step were sequentially performed to form an inorganic foamed formed body.
【0020】予備成形体形成工程では、予め用意された
成形型等に前記無機組成物を注入する等して、その無機
組成物を所定の形状に賦形した。続いて、無機組成物を
常温下で放置し、その無機組成物中に含まれている水分
を除去した。水分除去により無機組成物が固化し、所望
の形状の予備成形体が得られた。この段階では、予備成
形体中には気泡が含まれていない。In the preform forming step, the inorganic composition was formed into a predetermined shape by, for example, injecting the inorganic composition into a mold or the like prepared in advance. Subsequently, the inorganic composition was left at room temperature to remove water contained in the inorganic composition. The inorganic composition was solidified by the removal of water, and a preform having a desired shape was obtained. At this stage, no bubbles are contained in the preform.
【0021】続く発泡成形工程では、予備成形体を炉の
中で5分間程度約150℃に加熱した。すると、予備成
形体中のアルカリ金属ケイ酸塩と卵殻粉とが反応し、無
機質発泡成形体が形成された。ここで、無機組成物及び
予備成形体が白色を呈していたのに対し、無機質発泡成
形体が黄白色を呈していたことから、次のような反応が
起こったものと考えられる。すなわち、各卵殻粉が核と
なり、卵殻粉の一成分であるたんぱく質が分解してガス
化し、多数の気泡を生ずる。卵殻粉の粒径は互いに揃っ
ており、1個当りの卵殻粉から単位時間当りに発生する
ガスの量は、卵殻粉間で同程度である。加えて、たんぱ
く質の分解及びガス化はゆっくり進行するので、大きな
気泡となる前にバインダが硬化し、無機質発泡成形体と
なる。In the subsequent foam molding step, the preform was heated to about 150 ° C. for about 5 minutes in a furnace. Then, the alkali metal silicate in the pre-formed body and the eggshell powder reacted to form an inorganic foamed shaped body. Here, since the inorganic composition and the preform had a white color, whereas the inorganic foamed molded product had a yellowish white color, it is considered that the following reaction occurred. That is, each eggshell powder becomes a nucleus, and a protein which is a component of the eggshell powder is decomposed and gasified to generate a large number of bubbles. The particle diameters of the eggshell powders are equal to each other, and the amount of gas generated from the eggshell powder per unit time per unit time is substantially the same between the eggshell powders. In addition, since the decomposition and gasification of the protein proceed slowly, the binder hardens before becoming large bubbles, and becomes an inorganic foam molded article.
【0022】このように、予備成形体形成工程及び発泡
成形工程といった、少なくかつ簡単な工程を経るだけ
で、目的とする無機質発泡成形体を形成することができ
た。得られた無機質発泡成形体を切断して内部の状態を
調べたところ、大きさの揃った微小な多数の気泡が分散
していた。しかも、隔壁を破って隣の気泡とつながって
いるものはほとんどみられなかった。多数の気泡は隔壁
によって仕切られ、独立していた。さらに、隔壁は十分
な硬度を有しており、無機質発泡成形体は硬く、容易に
は変形しなかった。このように無機質発泡成形体は、断
熱性、比重等の各種特性のばらつきが少ないので、軽
量、断熱性等が要求される製品、例えば無機断熱材、無
機建材等に好適に利用することができる。また、上述し
た無機組成物からこのような無機質発泡成形体が得られ
たことから、この無機組成物が無機質発泡成形体の材料
として適していることも明らかとなった。As described above, a desired inorganic foam molded article could be formed only through a few and simple steps such as a pre-molded article forming step and a foam molding step. When the obtained inorganic foam molded article was cut and the internal state was examined, a large number of minute air bubbles having a uniform size were dispersed. In addition, there was hardly any thing that broke the partition and was connected to the next bubble. Many bubbles were separated by partitions and were independent. Further, the partition walls had sufficient hardness, and the inorganic foam molded article was hard and did not easily deform. As described above, since the inorganic foam molded article has little variation in various properties such as heat insulating properties and specific gravity, it can be suitably used for products requiring light weight, heat insulating properties, and the like, for example, inorganic heat insulating materials, inorganic building materials, and the like. . In addition, since such an inorganic foam molded article was obtained from the above-described inorganic composition, it was clarified that this inorganic composition was suitable as a material for the inorganic foam molded article.
【0023】(第2実施例)次に、第2及び第3の発明
を具体化した第2実施例について説明する。第2実施例
では、無機組成物として第1実施例で説明したものと同
様のものを用いるとともに、基体として炭素繊維強化ボ
ードを用い、無機質発泡被覆を次のようにして形成し
た。(Second Embodiment) Next, a second embodiment embodying the second and third inventions will be described. In the second example, the same inorganic composition as that described in the first example was used, and a carbon fiber reinforced board was used as a substrate, and an inorganic foam coating was formed as follows.
【0024】基体の表面に、無機組成物を略一定の厚み
となるようにコーティングした。続いて、無機組成物を
常温下で放置して自然乾燥させ、その無機組成物中に含
まれている水分を除去した。水分除去により無機組成物
が固化し、基体上に加熱発泡性の無機質被覆が形成され
た。この段階では、無機質被覆中には気泡が含まれてい
ない。続いて、無機質被覆によって覆われた基体を約1
50℃の炉の中で約5分間放置した。この加熱により無
機質被覆中のアルカリ金属ケイ酸塩と卵殻粉とが反応
し、第1実施例と同様にして、互いに独立し、かつ微細
で大きさの揃った多数の気泡を含んだ無機質発泡被覆が
形成された。The surface of the substrate was coated with an inorganic composition so as to have a substantially constant thickness. Subsequently, the inorganic composition was allowed to stand at room temperature and air-dried to remove moisture contained in the inorganic composition. The inorganic composition was solidified by the removal of water, and a heat-foamable inorganic coating was formed on the substrate. At this stage, no bubbles are contained in the inorganic coating. Subsequently, the substrate covered by the inorganic coating is
It was left in a 50 ° C. oven for about 5 minutes. By this heating, the alkali metal silicate and the eggshell powder in the inorganic coating react with each other, and the inorganic foam coating containing a large number of fine and uniform bubbles independent of each other, as in the first embodiment. Was formed.
【0025】なお、基体上の無機質被覆は、加熱されな
い限りその形態を維持するが、加熱されることにより自
然に無機質発泡被覆に変化するといった特性に着目する
と、次のような用途も考えられる。例えば、外壁材を基
体とし、その上に無機質被覆を形成しておく。この段階
では加熱は行わない。このようにすれば、万が一火災が
発生し、熱が無機質被覆に加わると、無機質被覆中のア
ルカリ金属ケイ酸塩と卵殻粉とが反応して発泡し、無機
質発泡被覆となる。この無機質発泡被覆が断熱性、耐火
性等を発揮し、火炎を遮断することができる。The inorganic coating on the substrate keeps its form unless heated, but when it is heated, the inorganic coating naturally changes to an inorganic foam coating, and the following uses are considered. For example, an outer wall material is used as a base, and an inorganic coating is formed thereon. No heating is performed at this stage. In this way, if a fire occurs and heat is applied to the inorganic coating, the alkali metal silicate in the inorganic coating reacts with the eggshell powder to foam and form an inorganic foam coating. This inorganic foam coating exhibits heat insulation, fire resistance and the like, and can block a flame.
【0026】[0026]
【発明の効果】以上のように、第1または第2の発明の
形成方法によれば、少なくかつ簡単な工程を経るだけ
で、大きさの揃った多数の気泡を確実に発生させること
ができる。得られた無機質発泡成形体または無機質発泡
被覆は、互いに独立し、かつ大きさの揃った多数の気泡
を分散した状態で含み、断熱性、比重等の各種特性のば
らつきが少ないので、軽量、断熱性等が要求される分野
を始めとして、その他の種々の分野において幅広く利用
することができる。As described above, according to the forming method of the first or second aspect of the present invention, a large number of air bubbles of uniform size can be reliably generated only through a few and simple steps. . The obtained inorganic foam molded article or inorganic foam coating is independent of each other, and contains a large number of cells having a uniform size in a dispersed state, and has little variation in various properties such as heat insulating property and specific gravity. It can be widely used in various other fields, including fields requiring properties and the like.
【0027】第3の発明に係る無機組成物を用いれば、
これを加熱するだけで発泡するので、第1の発明での無
機質発泡成形体または第2の発明での無機質発泡被覆の
材料として好適である。By using the inorganic composition according to the third invention,
Since it is foamed only by heating it, it is suitable as a material for the inorganic foam molded article of the first invention or the inorganic foam coating of the second invention.
Claims (3)
バインダと、卵殻の微細粉砕物である卵殻粉とを含む無
機組成物を賦形成形するとともに、その無機組成物を乾
燥固化して予備成形体を形成する予備成形体形成工程
と、 前記予備成形体を加熱し、発泡させることにより無機質
発泡成形体を形成する発泡成形工程とを備えることを特
徴とする無機質発泡成形体の形成方法。1. An inorganic composition comprising a binder comprising an aqueous solution of an alkali metal silicate and an eggshell powder which is a finely crushed eggshell is formed, and the inorganic composition is dried, solidified and preformed. A method for forming an inorganic foam molded article, comprising: a preformed article forming step of forming a body; and a foam molding step of heating and foaming the preformed article to form an inorganic foam molded article.
バインダと、卵殻の微細粉砕物である卵殻粉とを含む無
機組成物を基体表面にコーティングし、次いでその無機
組成物を乾燥固化して発泡性の無機質被覆を形成した
後、その無機質被覆を加熱して発泡させることを特徴と
する無機質発泡被覆の形成方法。2. An inorganic composition comprising a binder comprising an aqueous solution of an alkali metal silicate and eggshell powder which is a finely crushed eggshell is coated on a substrate surface, and then the inorganic composition is dried, solidified and foamed. A method for forming an inorganic foamed coating, comprising forming a porous inorganic coating, and then heating and foaming the inorganic coating.
バインダと、 卵殻の微細粉砕物である卵殻粉とを含むことを特徴とす
る無機組成物。3. An inorganic composition comprising: a binder comprising an aqueous solution of an alkali metal silicate; and an eggshell powder which is a finely crushed eggshell.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17174898A JP2000007463A (en) | 1998-06-18 | 1998-06-18 | Formation of inorganic foamed molding or coating film and inorganic composition |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17174898A JP2000007463A (en) | 1998-06-18 | 1998-06-18 | Formation of inorganic foamed molding or coating film and inorganic composition |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2000007463A true JP2000007463A (en) | 2000-01-11 |
Family
ID=15928970
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17174898A Pending JP2000007463A (en) | 1998-06-18 | 1998-06-18 | Formation of inorganic foamed molding or coating film and inorganic composition |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2000007463A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002248870A (en) * | 2001-02-27 | 2002-09-03 | Ricoh Co Ltd | Heat peversible recording medium, card, label, and method for processing image |
CN108585945A (en) * | 2018-07-18 | 2018-09-28 | 河海大学 | A kind of concrete brick and preparation method thereof based on shell |
-
1998
- 1998-06-18 JP JP17174898A patent/JP2000007463A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002248870A (en) * | 2001-02-27 | 2002-09-03 | Ricoh Co Ltd | Heat peversible recording medium, card, label, and method for processing image |
CN108585945A (en) * | 2018-07-18 | 2018-09-28 | 河海大学 | A kind of concrete brick and preparation method thereof based on shell |
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