JPH11347341A - Granular hygroscopic material and method for producing the same - Google Patents
Granular hygroscopic material and method for producing the sameInfo
- Publication number
- JPH11347341A JPH11347341A JP16382298A JP16382298A JPH11347341A JP H11347341 A JPH11347341 A JP H11347341A JP 16382298 A JP16382298 A JP 16382298A JP 16382298 A JP16382298 A JP 16382298A JP H11347341 A JPH11347341 A JP H11347341A
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- amorphous silica
- moisture
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Abstract
(57)【要約】
【課題】 安価で優れた吸放湿性を有し、そのまま床下
などに設置できる粒状放湿性材料とその効率的な製造方
法を提供する。
【解決手段】 非晶質シリカ系鉱物１００重量部とアル
カリ金属水酸化物２．５〜５０重量部との加熱脱水物よ
りなり、かつ嵩密度が０．１〜１．２ｇ／ｃｍ3、吸放
湿率が５重量％以上である粒状吸放湿性材料。また、非
晶質シリカ系鉱物１００重量部に対しアルカリ金属水酸
化物が２．５〜５０重量部となるようにアルカリ金属水
酸化物水溶液を含浸し、得られた湿砂状又はスラリー状
の混合物を加熱脱水する粒状吸放湿性材料の製造方法。
非晶質シリカ鉱物としては、パーライト、火山性軽石、
珪藻土又は白土等の１種又は２種以上がよい。PROBLEM TO BE SOLVED: To provide a granular moisture releasing material which is inexpensive and has excellent moisture absorbing and releasing properties and which can be installed under the floor as it is, and an efficient production method thereof. SOLUTION: It consists of a heat dehydrated product of 100 parts by weight of an amorphous silica-based mineral and 2.5 to 50 parts by weight of an alkali metal hydroxide, has a bulk density of 0.1 to 1.2 g / cm 3 , and has a A particulate moisture absorbing / releasing material having a moisture release rate of 5% by weight or more. Further, an alkali metal hydroxide aqueous solution is impregnated so that the alkali metal hydroxide becomes 2.5 to 50 parts by weight with respect to 100 parts by weight of the amorphous silica-based mineral, and the obtained wet sand or slurry is obtained. A method for producing a particulate hygroscopic material, in which the mixture is heated and dehydrated.
As the amorphous silica mineral, pearlite, volcanic pumice,
One type or two or more types such as diatomaceous earth or clay are preferred.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、建築物等の結露防
止、湿度調整などに用いられる粒状吸放湿性材料及びそ
の製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a particulate moisture-absorbing and releasing material used for preventing dew condensation on buildings and the like and adjusting humidity, and a method for producing the same.
【０００２】[0002]
【従来の技術】近年、コンクリート構造物である集合住
宅の普及に加えて、火災時の安全性要求、生活様式の変
化、さらに木材の高騰などにより、特に住宅用の内装建
材には木材があまり使用されなくなり、ペンキ仕上やク
ロス張りのようにコンクリート壁に仕上げ材を直に施工
したり、安価で耐火性のあるセッコウボード等の無機系
建材が多用されるようになった。木材は高湿時には空気
中の水分を吸湿して湿度を下げ、低湿時には自ら保有す
る水分を放出して乾燥を抑制する、いわゆる吸放湿性を
有し、湿度の高い我が国に適した建材である。しかし、
コンクリート直仕上げや無機系建材は吸放湿性に乏し
く、壁面が結露したり、結露による濡れやしみが生じた
り、カビによる汚染が生ずるなどの問題がある。2. Description of the Related Art In recent years, the demand for safety in the event of fire, changes in lifestyles, and the rising costs of wood have been accompanied by the spread of apartment buildings that are concrete structures. They are no longer used, and finishing materials are directly applied to concrete walls, such as paint finishing and cloth upholstery, and inexpensive and fire-resistant inorganic building materials such as gypsum board have come to be used frequently. Timber absorbs moisture in the air at high humidity to reduce humidity, and releases moisture at low humidity to suppress drying. . But,
Concrete finishing and inorganic building materials have poor moisture absorption and desorption properties, and have problems such as dew condensation on the wall surface, wetting and spotting due to dew condensation, and contamination by mold.
【０００３】これを解決するものとしては、例えば特開
平３−１０９２４４号公報には、高度活性化処理したゼ
オライト粉粒体、セメント及び水溶性樹脂硬化剤、繊維
等の補強材を湿式混練し、任意の性状に圧縮成形した調
湿性建築材料が提案されている。しかしながら、この調
湿性建築材料は優れた吸放湿性を有しているものの、割
れやすいので小サイズのものしか製造できず、またセメ
ントを結合材としているために後養生が必要で製造に時
間がかかり、製品の密度も高い。したがって、これを建
物等の壁として施工する場合には、やや重く施工しにく
いという問題があった。また、この調湿性建築材料は同
時に透湿性の大きい材料でもあるので、グラスウール、
ロックウール等の断熱材を組み込んだ壁面として用いる
場合は、室内の湿分が透過して断熱材の結露を引き起こ
す欠点もあった。In order to solve this problem, for example, Japanese Patent Application Laid-Open No. 3-109244 discloses that a highly activated zeolite powder, cement and a water-soluble resin curing agent, and a reinforcing material such as fiber are wet-kneaded. Humidity-controllable building materials that have been compression-molded to arbitrary properties have been proposed. However, although this moisture-regulating building material has excellent moisture absorption and desorption properties, it is fragile and can be produced only in small sizes.Because cement is used as a binder, post-curing is required, and time is required for production. The cost of the product is high. Therefore, when this is constructed as a wall of a building or the like, there is a problem that it is slightly heavy and difficult to construct. In addition, since this moisture-regulating building material is also a material with high moisture permeability, glass wool,
When used as a wall surface incorporating a heat insulating material such as rock wool, there is also a disadvantage that moisture in the room permeates and causes condensation on the heat insulating material.
【０００４】また、この種の吸放湿性材料としては、ゼ
オライト系、珪酸カルシウム水和物系、珪藻土系、シリ
カゲル系など各種材料が利用されている。しかしなが
ら、ゼオライト系材料は、吸湿性に優れているが、放湿
性が劣るために吸放湿性建材として利用するには必ずし
も適していない。また、珪酸カルシウム水和物系や珪藻
土系材料は、短期間では優れた調湿性と防露性を有する
が、梅雨時のように長期間高湿度状態が続いた場合にそ
の吸湿量が飽和に達し、調湿性、防露性を失ってしま
う。一方、粒状材料や粉状材料として用いられるシリカ
ゲル系材料は、上記材料と比べると格段に優れた吸放湿
特性を有するが、高価で使用に制約がある。このよう
に、従来の吸放湿性材料は、性能、価格ともに満足でき
るものではなかった。[0004] As this kind of hygroscopic material, various materials such as zeolite, calcium silicate hydrate, diatomaceous earth, and silica gel are used. However, although the zeolite-based material is excellent in hygroscopicity, it is not always suitable for use as a hygroscopic building material because of its poor hygroscopicity. In addition, calcium silicate hydrate and diatomaceous earth materials have excellent humidity control and dew-proofing properties in a short period of time, but their moisture absorption becomes saturated when prolonged periods of high humidity such as during the rainy season. Reaches and loses humidity control and dew-proof properties. On the other hand, a silica gel material used as a granular material or a powder material has much better moisture absorption / release properties than the above materials, but is expensive and has limitations in use. As described above, the conventional hygroscopic materials have not been satisfactory in both performance and price.
【０００５】[0005]
【発明が解決しようとする課題】したがって、本発明の
目的は、安価で優れた吸放湿性を有し、そのまま床下な
どに設置できる粒状放湿性材料とその効率的な製造方法
を提供することにある。SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a particulate moisture releasing material which is inexpensive, has excellent moisture absorbing and releasing properties, can be installed directly under the floor, and the like, and an efficient production method thereof. is there.
【０００６】[0006]
【課題を解決するための手段】本発明者らは、アルカリ
金属水酸化物の水溶液を含浸した湿砂状のパーライト等
の非晶質シリカ系鉱物を加熱脱水するというごく簡単な
操作で、これに吸放湿性を付与できることを見いだし、
本発明をなすに至った。Means for Solving the Problems The present inventors conducted a very simple operation of heating and dehydrating an amorphous silica-based mineral such as pearlite in the form of wet sand impregnated with an aqueous solution of an alkali metal hydroxide. To be able to impart moisture absorption and release to
The present invention has been made.
【０００７】すなわち、本発明は、非晶質シリカ系鉱物
１００重量部とアルカリ金属水酸化物２．５〜５０重量
部との加熱脱水物よりなり、かつ嵩密度が０．１〜１．
２ｇ／ｃｍ3 、吸放湿率が５重量％以上である粒状吸放
湿性材料である。アルカリ金属水酸化物としては水酸化
ナトリウムが好ましく、非晶質シリカ系鉱物１００重量
部に対し水酸化ナトリウムは５〜１５重量部であること
がよい。また、非晶質シリカ鉱物としては、パーライ
ト、火山性軽石、珪藻土又は白土等の１種又は２種以上
であることがよい。That is, the present invention comprises a thermally dehydrated product of 100 parts by weight of an amorphous silica-based mineral and 2.5 to 50 parts by weight of an alkali metal hydroxide, and has a bulk density of 0.1 to 1.
2 g / cm 3, a particulate moisture-absorbing and desorbing material is Hygroscopic rate 5% by weight or more. As the alkali metal hydroxide, sodium hydroxide is preferable, and sodium hydroxide is preferably 5 to 15 parts by weight based on 100 parts by weight of the amorphous silica-based mineral. The amorphous silica mineral is preferably one or more of perlite, volcanic pumice, diatomaceous earth, or clay.
【０００８】また、本発明は、非晶質シリカ系鉱物１０
０重量部に対しアルカリ金属水酸化物が２．５〜５０重
量部となるようにアルカリ金属水酸化物水溶液を含浸
し、得られた湿砂状又はスラリー状の混合物を加熱脱水
することを特徴とする粒状吸放湿性材料の製造方法であ
る。湿砂状又はスラリー状の混合物の加熱脱水は、熱風
乾燥により行うことがよい。The present invention also relates to an amorphous silica-based mineral 10
An alkali metal hydroxide aqueous solution is impregnated so that the alkali metal hydroxide becomes 2.5 to 50 parts by weight with respect to 0 parts by weight, and the obtained wet sand or slurry mixture is heated and dehydrated. This is a method for producing a particulate moisture-absorbing / desorbing material. Heat dehydration of the wet sand or slurry mixture may be performed by hot air drying.
【０００９】[0009]
【発明の実施の形態】本発明において主材として用いら
れる非晶質シリカ系鉱物（以下、非晶質シリカと略す）
には、非晶質シリカ鉱物の他、非晶質シリカ−アルミナ
系鉱物も含まれる。反応性シリカを含有しない結晶質シ
リカ鉱物は、高温にしなければアルカリ金属水酸化物と
反応せず、吸放湿性材料を製造することが困難である。
このような非晶質シリカとしては、例えばパーライト、
火山性軽石、珪藻土、白土等の１種又は２種以上が挙げ
られる。DESCRIPTION OF THE PREFERRED EMBODIMENTS Amorphous silica-based mineral used as a main material in the present invention (hereinafter abbreviated as amorphous silica)
Includes amorphous silica-alumina minerals in addition to amorphous silica minerals. The crystalline silica mineral containing no reactive silica does not react with the alkali metal hydroxide unless heated to a high temperature, and it is difficult to produce a hygroscopic material.
Examples of such amorphous silica include pearlite,
One or more of volcanic pumice, diatomaceous earth, terra alba and the like can be mentioned.
【００１０】これらの中でも、天然の非晶質珪酸アルミ
ニウム水和鉱物を急速加熱して発泡させたパーライト
は、吸放湿特性、軽量性、加工性の面から特に好ましい
非晶質シリカである。天然の非晶質珪酸アルミニウム水
和鉱物としては、例えば黒曜石、真珠岩、松脂岩などが
挙げられる。パーライトの化学組成、性状及び形状は、
特に限定されないが、ＳｉＯ2 ７５〜８５％、Ａｌ2 Ｏ
3 １０〜１５％、その他の微量のＦｅ2 Ｏ3 、ＣａＯ、
Ｋ2 Ｏ、Ｎａ2 Ｏなどを含有し、嵩比重０．０４〜０．
２ｇ／ｃｍ3 、平均粒径５ｍｍ以下の粒子が好適に用い
られる。Among these, pearlite obtained by rapidly heating a natural amorphous aluminum silicate hydrated mineral to form a foam is a particularly preferred amorphous silica in terms of moisture absorption / release properties, light weight, and workability. Examples of natural hydrated amorphous aluminum silicate minerals include obsidian, perlite and pine stone. The chemical composition, properties and shape of perlite are
Although not particularly limited, 75 to 85% of SiO 2 , Al 2 O
3 10 to 15%, other trace amounts of Fe 2 O 3 , CaO,
K 2 O, containing like Na 2 O, bulk density 0.04 to 0.
Particles having 2 g / cm 3 and an average particle size of 5 mm or less are preferably used.
【００１１】パーライト以外の非晶質シリカとしては、
嵩比重０．３〜１．２ｇ／ｃｍ3 、平均粒径１０ｍｍ以
下の火山性軽石や、嵩比重０．５〜１．２ｇ／ｃｍ3 、
粉末状の白土や、嵩比重０．２〜１．０ｇ／ｃｍ3 、粉
末状の珪藻土などを用いることができる。As amorphous silica other than pearlite,
A volcanic pumice having a bulk specific gravity of 0.3 to 1.2 g / cm 3 and an average particle size of 10 mm or less, a bulk specific gravity of 0.5 to 1.2 g / cm 3 ,
Powdered white clay, powdered diatomaceous earth having a bulk specific gravity of 0.2 to 1.0 g / cm 3 , or the like can be used.
【００１２】また、アルカリ金属水酸化物は、例えば水
酸化ナトリウム、水酸化カリウム、水酸化リチウムなど
が使用可能であるが、費用対効果の観点から、特に水酸
化ナトリウムが好ましい。以下、水酸化ナトリウムを使
用した粒状吸放湿性材料について説明するが、水酸化ナ
トリウムの一部又は全部を水酸化カリウム、水酸化リチ
ウム等の他のアルカリ金属水酸化物で置換することがで
きるものであり、本発明は水酸化ナトリウムのみに限定
されるものではない。Further, as the alkali metal hydroxide, for example, sodium hydroxide, potassium hydroxide, lithium hydroxide and the like can be used, and from the viewpoint of cost effectiveness, sodium hydroxide is particularly preferable. Hereinafter, a description will be given of a particulate moisture-absorbing and desorbing material using sodium hydroxide, in which a part or all of sodium hydroxide can be replaced with another alkali metal hydroxide such as potassium hydroxide or lithium hydroxide. The present invention is not limited to sodium hydroxide alone.
【００１３】本発明の粒状吸放湿性材料において、非晶
質シリカと水酸化ナトリウムの配合割合は、非晶質シリ
カ１００重量部に対し水酸化ナトリウムが３〜２５重量
部、好ましくは５〜１５重量部である。水酸化ナトリウ
ムが３重量部より少ないと非晶質シリカに十分な吸放湿
性が付与されず、２５重量部を超えると得られた吸放湿
性材中に水酸化ナトリウムが残存して高ｐＨとなり、潮
解性を示すなど実用上の問題が生じる。この水酸化ナト
リウムは、水溶液として非晶質多孔質体に含浸させるこ
とがよい。アルカリ金属水酸化物として水酸化カリウム
を使用する場合には、同様な観点で、５〜５０重量部と
することが好ましい。In the particulate moisture absorbing and releasing material of the present invention, the mixing ratio of amorphous silica and sodium hydroxide is such that sodium hydroxide is 3 to 25 parts by weight, preferably 5 to 15 parts by weight with respect to 100 parts by weight of amorphous silica. Parts by weight. If the amount of sodium hydroxide is less than 3 parts by weight, sufficient hygroscopicity is not imparted to the amorphous silica, and if the amount exceeds 25 parts by weight, sodium hydroxide remains in the obtained hygroscopic material and becomes high pH. And practical problems such as deliquescent. This sodium hydroxide is preferably impregnated into the amorphous porous material as an aqueous solution. When potassium hydroxide is used as the alkali metal hydroxide, the content is preferably 5 to 50 parts by weight from the same viewpoint.
【００１４】本発明の粒状吸放湿性材料の嵩密度は、
０．１〜１．２ｇ／ｃｍ3 であり、好ましくは０．１〜
０．８ｇ／ｃｍ3 がよい。嵩密度が０．１ｇ／ｃｍ3 よ
り小さいと必要な強度物性が得られず、１．２ｇ／ｃｍ
3 を超えると軽量性が損なわれる。主材の非晶質シリカ
として低嵩密度（０．１ｇ／ｃｍ3 前後）のパーライト
を用いると、極めて軽量の吸放湿性材料を製造できる。
また、このような軽量のパーライトでも、湿砂状の原料
混合物を予め圧縮した後加熱脱水したり、圧縮下に加熱
脱水するなど圧縮することにより、高嵩密度の粒状吸放
湿性材料を製造することが可能である。The bulk density of the particulate hygroscopic material of the present invention is:
0.1 to 1.2 g / cm 3 , preferably 0.1 to
0.8 g / cm 3 is good. If the bulk density is less than 0.1 g / cm 3 , the required strength physical properties cannot be obtained, and
If it exceeds 3 , the lightness is impaired. When pearlite having a low bulk density (about 0.1 g / cm 3 ) is used as the main material amorphous silica, an extremely lightweight hygroscopic material can be manufactured.
In addition, even with such a lightweight pearlite, a high-density granular moisture-absorbing / desorbing material is manufactured by compressing a wet sand-like raw material mixture in advance by heating and dehydrating after heating, or by heating and dehydrating under compression. It is possible.
【００１５】また、本発明の粒状吸放湿性材料の吸放湿
率は、５重量％以上であることが必要である。この吸放
湿率が５重量％より低いと、防露性を低下させる。本発
明でいう吸放湿率とは、吸放湿性材料を恒温恒湿器中に
入れ、２５℃−ＲＨ９０％、２５℃−ＲＨ５０％の条件
を２４時間毎に繰り返し、吸湿重量と放湿重量がほぼ一
定の値になったときの重量Ａを求め、重量Ａを吸放湿性
材料の全乾燥重量Ｂで除して得られるもの（重量％）で
ある。The moisture absorption / release rate of the particulate moisture absorption / release material of the present invention needs to be 5% by weight or more. If the moisture absorption / desorption rate is lower than 5% by weight, the anti-dew property is reduced. The moisture absorption / desorption rate as referred to in the present invention means that the moisture absorption / desorption material is put into a thermo-hygrostat and the conditions of 25 ° C.-RH 90% and 25 ° C.-RH 50% are repeated every 24 hours, and the moisture absorption and desorption weights are obtained. Is substantially constant, and is obtained by dividing the weight A by the total dry weight B of the hygroscopic material (% by weight).
【００１６】次に、本発明の粒状吸放湿性材料の製造方
法について説明する。先ず、主原料の非晶質シリカ１０
０重量部に対し、水酸化ナトリウム水溶液を固形分換算
で３〜２０重量部、好ましくは５〜１５重量部となるよ
うに添加し、リボンミキサー、マラー混合機、ニーダ
ー、パッグミル等の混合機にこれらの材料を投入し、常
温又は加温下で攪拌混合すると、湿砂状又はスラリー状
の混合物が得られる。この際、水分量は非晶質シリカ１
００重量部に対し１０〜２００重量部となるように調節
することがよい。この反応には、適量の水分の存在が必
要であり、水分量がこれより少ないと水酸化ナトリウム
が非晶質シリカに含浸しにくくなり、これより多いと加
熱処理で脱水するのに長時間を要し生産性が低下する。
この水分量は、水酸化ナトリウム水溶液濃度を調節する
か、又は必要な水を後添加する方法で調節することがで
きる。Next, a method for producing the particulate moisture absorbing and releasing material of the present invention will be described. First, amorphous silica 10 as a main raw material was used.
To 0 parts by weight, an aqueous sodium hydroxide solution is added in an amount of 3 to 20 parts by weight, preferably 5 to 15 parts by weight in terms of solid content, and the mixture is added to a mixer such as a ribbon mixer, a muller mixer, a kneader, and a pug mill. When these materials are charged and stirred and mixed at room temperature or under heating, a wet sand-like or slurry-like mixture is obtained. At this time, the amount of moisture was
The amount is preferably adjusted to be 10 to 200 parts by weight with respect to 00 parts by weight. This reaction requires the presence of an appropriate amount of water.If the amount of water is less than this, it becomes difficult for sodium hydroxide to impregnate the amorphous silica, and if it is more than this, it takes a long time to dehydrate by heat treatment. Essentially, productivity decreases.
The amount of water can be adjusted by adjusting the concentration of the aqueous sodium hydroxide solution or by post-adding necessary water.
【００１７】次いで、湿砂状又はスラリー状の混合物を
乾燥機に装入し、これに熱風を吹き込んで水分がほぼ蒸
発し、全乾となるまで、例えば１００〜２００℃、１〜
６時間程度加熱脱水すると、非晶質シリカと水酸化ナト
リウムが反応し、粒状吸放湿性材料が得られる。この乾
燥機としては、横型、竪型など任意の乾燥機を用いるこ
とができるが、特にロータリーキルンは乾燥効率が高い
ので好ましい。非晶質シリカとしてパーライトを用いる
場合、この乾燥機に代えてホットプレス等の加熱加圧装
置を用いると、パーライトは圧縮され、嵩密度の比較的
高い粒状吸放湿性材料を得ることができる。また、湿砂
状の原料混合物を加熱する前に、プレスやベルトプレス
等の常温加圧機で圧縮した後乾燥機に装入してもよい。Next, the wet sand-like or slurry-like mixture is charged into a dryer, and hot air is blown into the mixture to substantially evaporate the water, until the mixture is completely dried, for example, at 100 to 200 ° C., 1 to 1 hour.
After heating and dehydrating for about 6 hours, the amorphous silica and sodium hydroxide react, and a particulate moisture absorbing / releasing material is obtained. As this dryer, any dryer such as a horizontal type or a vertical type can be used, but a rotary kiln is particularly preferred because of its high drying efficiency. When pearlite is used as the amorphous silica, if a heating and pressurizing device such as a hot press is used instead of the dryer, the pearlite is compressed and a particulate moisture absorbing / releasing material having a relatively high bulk density can be obtained. Further, before the wet sand-like raw material mixture is heated, the raw sand mixture may be compressed by a room-temperature press such as a press or a belt press and then charged into a dryer.
【００１８】このようにして得られた粒状吸放湿性材料
は、非晶質シリカ１００重量部に対し水酸化ナトリウム
が３〜２５重量部、好ましくは５〜１５重量部、嵩密度
が０．１〜１．２ｇ／ｃｍ3 、好ましくは０．１〜０．
８ｇ／ｃｍ3 、吸放湿率が５重量％以上であって、吸湿
時に潮解性を示さず、かつ優れた耐水性を示す。また、
有機物を含有していないので優れた耐火性と不燃性を有
する。The particulate hygroscopic material thus obtained contains sodium hydroxide in an amount of 3 to 25 parts by weight, preferably 5 to 15 parts by weight, and a bulk density of 0.1 to 100 parts by weight of the amorphous silica. To 1.2 g / cm 3 , preferably 0.1 to 0.1 g / cm 3 .
8 g / cm 3 , moisture absorption / desorption rate is 5% by weight or more, shows no deliquescence when absorbing moisture, and shows excellent water resistance. Also,
Since it does not contain organic matter, it has excellent fire resistance and nonflammability.
【００１９】本発明の粒状吸放湿性材料は、これをその
まま床下などに設置して建築物の湿度調整に用いること
ができる。この粒状吸放湿性材料を透湿性紙材や透湿性
プラスチックフィルムなどに包装すると取り扱いが容易
になる。また、この粒状吸放湿性材料を他の建築材料と
組み合わせると吸放湿機能を付与することが可能にな
る。さらに、建築用途以外に、食品を始め各種製品の吸
放湿性材料として効果的に用いることができる。The particulate moisture-absorbing and desorbing material of the present invention can be used as it is under a floor or the like for adjusting the humidity of a building. When this granular moisture absorbing / releasing material is packaged in a moisture-permeable paper material, a moisture-permeable plastic film, or the like, handling becomes easy. Further, when this particulate moisture absorbing / releasing material is combined with another building material, it becomes possible to impart a moisture absorbing / releasing function. Further, it can be effectively used as a moisture-absorbing and releasing material for various products including foods, in addition to architectural uses.
【００２０】本発明の作用は、まだ十分に解明されては
いないが、加熱処理時に非晶質シリカの主成分であるシ
リカ及び随伴する副成分アルミナ等の一部は、水酸化ナ
トリウムと反応して、珪酸及びアルミン酸のナトリウム
塩を生成する。これらの化合物は脱水される過程で重縮
合ゲル化し、その際に非晶質シリカの表面に吸放湿性の
活性表面が形成されるものと考えられる。Although the function of the present invention has not yet been elucidated sufficiently, during the heat treatment, part of the silica, which is the main component of the amorphous silica, and the accompanying auxiliary component alumina, react with sodium hydroxide. To form the sodium salts of silicic and aluminate. It is considered that these compounds form a polycondensation gel during the dehydration process, and at this time, a hygroscopic active surface is formed on the surface of the amorphous silica.
【００２１】本発明において、主材として非晶質シリカ
を用いた理由は、これに含有されるシリカ成分が非晶性
であり、アルカリとの反応性に優れており、簡便な操作
で性能の優れた粒状吸放湿性材料が得られるからであ
る。これに対し、主材として珪砂等の結晶質シリカを用
いると、本発明の条件では水酸化ナトリウムと反応せ
ず、粒状吸放湿性材料が得られない。In the present invention, the reason that amorphous silica is used as the main material is that the silica component contained therein is amorphous, has excellent reactivity with alkali, and has a high performance with a simple operation. This is because an excellent granular hygroscopic material can be obtained. On the other hand, if crystalline silica such as silica sand is used as the main material, it does not react with sodium hydroxide under the conditions of the present invention, and a particulate moisture absorbing / releasing material cannot be obtained.
【００２２】本発明によれば、非晶質シリカとして本来
吸放湿性の無い火山性軽石、パーライト、白土などを使
用して、吸放湿性を有する粒状材料とすることができ、
また非晶質シリカとして珪藻土を使用した場合、珪藻土
が本来有する吸放湿性を大幅に高めた粒状材料を提供す
ることが可能になる。よって、建築物等の結露防止、湿
度調整にとって、省エネにも適合した有効な材料であ
る。According to the present invention, it is possible to use a volcanic pumice, a pearlite, a clay, etc., which originally have no hygroscopicity as amorphous silica, to obtain a granular material having hygroscopicity.
Further, when diatomaceous earth is used as the amorphous silica, it is possible to provide a granular material whose diatomaceous earth originally has greatly improved moisture absorption / release properties. Therefore, it is an effective material suitable for energy saving for prevention of dew condensation and humidity adjustment of buildings and the like.
【００２３】[0023]
【実施例】以下、実施例及び比較例に基づいて本発明を
具体的に説明する。The present invention will be specifically described below based on examples and comparative examples.
【００２４】実施例１ 平均粒径０．２〜０．３ｍｍ、嵩密度０．０９〜０．１
２ｇ／ｃｍ3 のパーライト（三井金属鉱業株式会社製、
三井パーライト・加工用４号）１００重量部に対し濃度
２０重量％の水酸化ナトリウム水溶液１５重量部を加え
てローター型ミキサーで均一に撹拌混合した。得られた
湿砂状の混合物を熱風乾燥機に装入し、温度１５０℃で
４時間加熱脱水し、乾燥状態の粒状材料を得た。Example 1 Average particle size 0.2-0.3 mm, bulk density 0.09-0.1
2 g / cm 3 perlite (manufactured by Mitsui Kinzoku Mining Co., Ltd.
15 parts by weight of an aqueous solution of sodium hydroxide having a concentration of 20% by weight was added to 100 parts by weight of Mitsui Perlite, No. 4 for processing, and the mixture was uniformly stirred and mixed with a rotor mixer. The obtained wet sand-like mixture was charged into a hot-air drier and heated and dehydrated at 150 ° C. for 4 hours to obtain a dried granular material.
【００２５】実施例２ 濃度２５重量％の水酸化ナトリウム水溶液の添加量を４
０重量部とした以外は、実施例１と同一の条件で処理し
て乾燥状態の粒状材料を得た。Example 2 The addition amount of a 25% by weight aqueous sodium hydroxide solution was 4
Processing was carried out under the same conditions as in Example 1 except that the amount was 0 parts by weight to obtain a granular material in a dry state.
【００２６】実施例３ 濃度２０重量％の水酸化ナトリウム水溶液の添加量を８
０重量部とした以外は、実施例１と同一の条件で処理し
て乾燥状態の粒状材料を得た。Example 3 The addition amount of an aqueous solution of sodium hydroxide having a concentration of 20% by weight was 8
Processing was carried out under the same conditions as in Example 1 except that the amount was 0 parts by weight to obtain a granular material in a dry state.
【００２７】比較例１ 実施例１のパーライトを未処理のまま用いた。Comparative Example 1 The pearlite of Example 1 was used without any treatment.
【００２８】比較例２ 濃度１０重量％の水酸化ナトリウム水溶液の添加量を２
０重量部とした以外は、実施例１と同一の条件で処理し
て乾燥状態の粒状材料を得た。Comparative Example 2 The addition amount of a 10% by weight aqueous sodium hydroxide solution was 2
Processing was carried out under the same conditions as in Example 1 except that the amount was 0 parts by weight to obtain a granular material in a dry state.
【００２９】比較例３ 濃度３０重量％の水酸化ナトリウム水溶液の添加量を１
００重量部とした以外は、実施例１と同一の条件で処理
して乾燥状態の粒状材料を得た。しかし、この粒状材料
は強いアルカリ性を示し、取り扱いに注意を要するもの
であった。Comparative Example 3 The addition amount of the aqueous solution of sodium hydroxide having a concentration of 30% by weight was 1
A dry granular material was obtained by treating under the same conditions as in Example 1 except that the amount was 00 parts by weight. However, this granular material exhibited strong alkalinity and required careful handling.
【００３０】比較例４ パーライトに代えて６号珪砂を用いた以外は、実施例１
と同様に加熱処理したが、珪砂と水酸化ナトリウムの混
合物は反応しなかった。Comparative Example 4 Example 1 was repeated except that No. 6 silica sand was used instead of pearlite.
However, the mixture of silica sand and sodium hydroxide did not react.
【００３１】実施例１〜３及び比較例１〜３で調製した
粒状材料について、嵩密度及び吸放湿率を測定した結果
を表１に示す。なお、吸放湿率は、測定材料を恒温恒湿
器中に入れ、２５℃−ＲＨ９０％、２５℃−ＲＨ５０％
の条件を２４時間毎に繰り返し、吸湿重量と放湿重量が
ほぼ一定の値になったときの重量Ａを求め、重量Ａを吸
放湿性材料の絶乾重量Ｂで除して算出した。With respect to the granular materials prepared in Examples 1 to 3 and Comparative Examples 1 to 3, the results of measuring the bulk density and the moisture absorption / release ratio are shown in Table 1. The moisture absorption / desorption rate was determined by placing the measurement material in a thermo-hygrostat at 25 ° C-RH90% and 25 ° C-RH50%.
Was repeated every 24 hours, the weight A when the moisture absorption weight and the moisture release weight became substantially constant values was obtained, and the weight A was divided by the absolute dry weight B of the moisture absorption / desorption material.
【００３２】実施例４ 平均粒径１．５ｍｍ、嵩密度０．４ｇ／ｃｍ3 の火山性
軽石（北海道有珠岳）１００重量部に対し濃度２０重量
％の水酸化ナトリウム水溶液１５重量部を加えローター
型ミキサーで均一に撹拌混合した。得られた湿砂状の混
合物を熱風乾燥機に装入し、温度１５０℃で４時間加熱
脱水し、乾燥状態の粒状材料を得た。Example 4 15 parts by weight of a 20% by weight aqueous sodium hydroxide solution were added to 100 parts by weight of a volcanic pumice (Usudake, Hokkaido) having an average particle size of 1.5 mm and a bulk density of 0.4 g / cm 3 , and the rotor was added. The mixture was uniformly stirred and mixed by a mold mixer. The obtained wet sand-like mixture was charged into a hot-air drier and heated and dehydrated at 150 ° C. for 4 hours to obtain a dried granular material.
【００３３】実施例５ 濃度２５重量％の水酸化ナトリウム水溶液の添加量を８
０重量部とした以外は、実施例４と同一の条件で処理し
て乾燥状態の粒状材料を得た。Example 5 The addition amount of a 25% by weight aqueous sodium hydroxide solution was 8
Processing was carried out under the same conditions as in Example 4 except that the amount was 0 parts by weight to obtain a granular material in a dry state.
【００３４】比較例５ 実施例４の火山性軽石を未処理のまま用いた。Comparative Example 5 The volcanic pumice of Example 4 was used without any treatment.
【００３５】比較例６ 濃度１０重量％の水酸化ナトリウム水溶液の添加量を２
０重量部とした以外は、実施例４と同一の条件で処理し
て乾燥状態の粒状材料を得た。Comparative Example 6 The amount of the aqueous solution of sodium hydroxide having a concentration of 10% by weight was 2
Processing was carried out under the same conditions as in Example 4 except that the amount was 0 parts by weight to obtain a granular material in a dry state.
【００３６】実施例４、５及び比較例５、６で調製した
粒状材料について、嵩密度及び吸放湿率を測定した結果
を表２に示す。吸放湿率は前記と同様にして求めた。With respect to the granular materials prepared in Examples 4 and 5 and Comparative Examples 5 and 6, the results of measuring the bulk density and the moisture absorption / desorption ratio are shown in Table 2. The moisture absorption / release rate was determined in the same manner as described above.
【００３７】実施例６ 平均粒径４０μｍ、嵩密度０．５ｇ／ｃｍ3 の白土（丸
中白土＃２５０）１００重量部に対し濃度３．５重量％
の水酸化ナトリウム水溶液８６重量部を加えてローター
型ミキサーで均一に撹拌混合した。得られたスラリー状
の混合物を熱風乾燥機中で温度１５０℃、４時間加熱脱
水して塊状物を得た。この塊状物をハンマー型ミルで破
砕し、粒径５ｍｍ以下の乾燥状態の粒状材料を得た。Example 6 Concentration: 3.5% by weight based on 100 parts by weight of white clay (Marunaka white clay # 250) having an average particle size of 40 μm and a bulk density of 0.5 g / cm 3
86 parts by weight of an aqueous sodium hydroxide solution was added, and the mixture was uniformly stirred and mixed with a rotor mixer. The resulting slurry mixture was heated and dehydrated in a hot air drier at a temperature of 150 ° C. for 4 hours to obtain a lump. This lump was crushed by a hammer mill to obtain a dry granular material having a particle size of 5 mm or less.
【００３８】実施例７ 濃度２５重量％の水酸化ナトリウム水溶液の添加量を８
０重量部とした以外は、実施例６と同一の条件で処理し
て乾燥状態の粒状材料を得た。Example 7 The amount of an aqueous solution of sodium hydroxide having a concentration of 25% by weight was 8
Processing was carried out under the same conditions as in Example 6 except that the amount was 0 parts by weight to obtain a granular material in a dry state.
【００３９】比較例７ 実施例６の白土を未処理のまま用いた。Comparative Example 7 The clay of Example 6 was used without any treatment.
【００４０】比較例８ 濃度２重量％の水酸化ナトリウム水溶液の添加量を１０
０重量部とした以外は、実施例６と同一の条件で処理し
て乾燥状態の粒状材料を得た。Comparative Example 8 The addition amount of an aqueous sodium hydroxide solution having a concentration of 2% by weight was 10
Processing was carried out under the same conditions as in Example 6 except that the amount was 0 parts by weight to obtain a granular material in a dry state.
【００４１】実施例６、７及び比較例７、８で調製した
粒状材料について、嵩密度及び吸放湿率を測定した結果
を表３に示す。吸放湿率は前記と同様にして求めた。With respect to the granular materials prepared in Examples 6 and 7 and Comparative Examples 7 and 8, the results of measuring the bulk density and the moisture absorption / release ratio are shown in Table 3. The moisture absorption / release rate was determined in the same manner as described above.
【００４２】実施例８ ４５μｍ篩通過分７５％、嵩密度０．２ｇ／ｃｍ3 の珪
藻土（北秋珪藻土 オプライト）１００重量部に対し濃
度２重量％の水酸化ナトリウム水溶液１５０重量部を加
えてローター型ミキサーで均一に撹拌混合した。得られ
たスラリー状の混合物を熱風乾燥機中で温度１５０℃、
４時間加熱脱水して塊状物を得た。この塊状物をハンマ
ー型ミルで破砕し、粒径５ｍｍ以下の乾燥状態の粒状材
料を得た。Example 8 A rotor was prepared by adding 150 parts by weight of a 2% by weight aqueous sodium hydroxide solution to 100 parts by weight of diatomaceous earth (Hokushu diatomaceous earth Oplite) having 75% of a 45 μm sieve and a bulk density of 0.2 g / cm 3. The mixture was uniformly stirred and mixed by a mold mixer. The resulting slurry-like mixture was heated in a hot air drier at a temperature of 150 ° C.
Heat dehydration was performed for 4 hours to obtain a lump. This lump was crushed by a hammer mill to obtain a dry granular material having a particle size of 5 mm or less.
【００４３】実施例９ 濃度１２重量％の水酸化ナトリウム水溶液の添加量を１
６７重量部とした以外は、実施例８と同一の条件で処理
して乾燥状態の粒状材料を得た。Example 9 The addition amount of an aqueous solution of sodium hydroxide having a concentration of 12% by weight was 1
Except that the amount was changed to 67 parts by weight, treatment was performed under the same conditions as in Example 8 to obtain a dry granular material.
【００４４】比較例９ 実施例８の珪藻土を未処理のまま用いた。Comparative Example 9 The diatomaceous earth of Example 8 was used without any treatment.
【００４５】実施例８、９及び比較例９で調製した粒状
材料について、嵩密度及び吸放湿率を測定した結果を表
４に示す。吸放湿率は前記と同様にして求めた。Table 4 shows the results of measuring the bulk density and the moisture absorption / desorption rate of the granular materials prepared in Examples 8 and 9 and Comparative Example 9. The moisture absorption / release rate was determined in the same manner as described above.
【００４６】[0046]
【表１】 [Table 1]
【００４７】[0047]
【表２】 [Table 2]
【００４８】[0048]
【表３】 [Table 3]
【００４９】[0049]
【表４】 [Table 4]
【００５０】[0050]
【発明の効果】本発明によれば、パーライト等の非晶質
シリカにアルカリ金属水酸化物の水溶液を加えて加熱脱
水するという簡単な操作で、吸放湿性が優れ、しかも軽
量で耐水性、耐火性及び経済性にも優れた、建築用の粒
状吸放湿性材料を得ることができる。また、本発明の粒
状吸放湿性材料は、建築用以外にも食品を始め各種製品
の吸放湿性材料として効果的に用いることができる。According to the present invention, a simple operation of adding an aqueous solution of an alkali metal hydroxide to an amorphous silica such as pearlite and heating and dehydrating, provides excellent moisture absorption and desorption, and is lightweight and water resistant. It is possible to obtain a granular moisture-absorbing and desorbing material for building, which is excellent in fire resistance and economy. In addition, the granular moisture-absorbing and desorbing material of the present invention can be effectively used as a moisture-absorbing and desorbing material for foods and various other products besides for construction.
Claims (5)
カリ金属水酸化物２．５〜５０重量部との加熱脱水物よ
りなり、かつ嵩密度が０．１〜１．２ｇ／ｃｍ3 、吸放
湿率が５重量％以上である粒状吸放湿性材料。1. A heat-dehydrated product of 100 parts by weight of an amorphous silica-based mineral and 2.5 to 50 parts by weight of an alkali metal hydroxide, and having a bulk density of 0.1 to 1.2 g / cm 3 , A particulate moisture absorbing and releasing material having a moisture absorbing and releasing rate of 5% by weight or more.
ムであり、非晶質シリカ系鉱物１００重量部に対し水酸
化ナトリウムが５〜１５重量部である請求項１記載の粒
状吸放湿性材料。2. The particulate hygroscopic material according to claim 1, wherein the alkali metal hydroxide is sodium hydroxide, and sodium hydroxide is 5 to 15 parts by weight based on 100 parts by weight of the amorphous silica-based mineral.
軽石、珪藻土及び白土からなる群から選ばれた少なくと
も１種である請求項１又は２記載の粒状吸放湿性材料。3. The particulate hygroscopic material according to claim 1, wherein the amorphous silica mineral is at least one selected from the group consisting of pearlite, volcanic pumice, diatomaceous earth, and clay.
アルカリ金属水酸化物が２．５〜５０重量部となるよう
にアルカリ金属水酸化物水溶液を含浸し、得られた湿砂
状又はスラリー状の混合物を加熱脱水することを特徴と
する粒状吸放湿性材料の製造方法。4. An impregnated aqueous solution of an alkali metal hydroxide in an amount of 2.5 to 50 parts by weight of an alkali metal hydroxide based on 100 parts by weight of an amorphous silica-based mineral. A method for producing a particulate hygroscopic material, comprising heating and dehydrating a slurry-like mixture.
水が熱風乾燥により行われる請求項４記載の粒状吸放湿
性材料の製造方法。5. The method for producing a particulate moisture-absorbing / desorbing material according to claim 4, wherein the dehydration by heating the wet sand-like or slurry-like mixture is performed by hot-air drying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16382298A JP3418122B2 (en) | 1998-06-11 | 1998-06-11 | Method for producing granular moisture absorbing and releasing material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16382298A JP3418122B2 (en) | 1998-06-11 | 1998-06-11 | Method for producing granular moisture absorbing and releasing material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11347341A true JPH11347341A (en) | 1999-12-21 |
| JP3418122B2 JP3418122B2 (en) | 2003-06-16 |
Family
ID=15781400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16382298A Expired - Lifetime JP3418122B2 (en) | 1998-06-11 | 1998-06-11 | Method for producing granular moisture absorbing and releasing material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3418122B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001190951A (en) * | 2000-01-11 | 2001-07-17 | Nippon Steel Chem Co Ltd | Solid humidity control material and method for producing the same |
| JP2002003271A (en) * | 2000-06-15 | 2002-01-09 | Miyagi Prefecture | Hygroscopic lightweight molded article and method for producing the same |
| JP2008221031A (en) * | 2007-03-08 | 2008-09-25 | Taiheiyo Cement Corp | Moisture conditioning material |
| JP2010094636A (en) * | 2008-10-19 | 2010-04-30 | Hokkaido Univ | Moisture absorbing and discharging material, and method of manufacturing the same |
| JP2011167688A (en) * | 2011-03-28 | 2011-09-01 | Hokkaido Univ | Humidity controlling and gas adsorbing material, and method for manufacturing the same |
| JP4938448B2 (en) * | 2003-07-23 | 2012-05-23 | チャイナ ペトロリウム アンド ケミカル コーポレイション | Desulfurization and new process for it |
| JP2013063866A (en) * | 2011-09-15 | 2013-04-11 | Kagoshima Prefecture | Functional material composition that contains volcanic product or volcanic product foam, and method of producing the composition |
| JP2020083754A (en) * | 2018-11-20 | 2020-06-04 | 大建工業株式会社 | Inorganic board, ceiling finishing material, ceiling structure, and method for manufacturing inorganic board |
| JP2021186726A (en) * | 2020-05-28 | 2021-12-13 | 豊和直 株式会社 | Contaminant treatment agent and its manufacturing method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106732341B (en) * | 2016-12-02 | 2019-02-01 | 中国矿业大学(北京) | A kind of diatomite/white carbon black composite humidity adjusting material and preparation method thereof |
-
1998
- 1998-06-11 JP JP16382298A patent/JP3418122B2/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001190951A (en) * | 2000-01-11 | 2001-07-17 | Nippon Steel Chem Co Ltd | Solid humidity control material and method for producing the same |
| JP2002003271A (en) * | 2000-06-15 | 2002-01-09 | Miyagi Prefecture | Hygroscopic lightweight molded article and method for producing the same |
| JP4938448B2 (en) * | 2003-07-23 | 2012-05-23 | チャイナ ペトロリウム アンド ケミカル コーポレイション | Desulfurization and new process for it |
| JP2008221031A (en) * | 2007-03-08 | 2008-09-25 | Taiheiyo Cement Corp | Moisture conditioning material |
| JP2010094636A (en) * | 2008-10-19 | 2010-04-30 | Hokkaido Univ | Moisture absorbing and discharging material, and method of manufacturing the same |
| JP2011167688A (en) * | 2011-03-28 | 2011-09-01 | Hokkaido Univ | Humidity controlling and gas adsorbing material, and method for manufacturing the same |
| JP2013063866A (en) * | 2011-09-15 | 2013-04-11 | Kagoshima Prefecture | Functional material composition that contains volcanic product or volcanic product foam, and method of producing the composition |
| JP2020083754A (en) * | 2018-11-20 | 2020-06-04 | 大建工業株式会社 | Inorganic board, ceiling finishing material, ceiling structure, and method for manufacturing inorganic board |
| JP2021186726A (en) * | 2020-05-28 | 2021-12-13 | 豊和直 株式会社 | Contaminant treatment agent and its manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3418122B2 (en) | 2003-06-16 |
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