JP2013226523A - Hygroscopic material, method for producing the same, and concrete sludge for water retention agent - Google Patents

Hygroscopic material, method for producing the same, and concrete sludge for water retention agent Download PDF

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JP2013226523A
JP2013226523A JP2012101610A JP2012101610A JP2013226523A JP 2013226523 A JP2013226523 A JP 2013226523A JP 2012101610 A JP2012101610 A JP 2012101610A JP 2012101610 A JP2012101610 A JP 2012101610A JP 2013226523 A JP2013226523 A JP 2013226523A
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water retention
retention agent
concrete sludge
deliquescent
moisture absorption
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Junichi Hojo
純一 北條
Miki Inada
幹 稲田
Noboru Iwaki
登 岩城
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KYUSHU KOATSU CONCRETE KOGYO KK
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Abstract

PROBLEM TO BE SOLVED: To supply a hygroscopic material which has a high moisture absorbing/humidity conditioning capacity and prevents absorbed water from leaking at a low price.SOLUTION: A hygroscopic material includes a deliquescent inorganic salt and a water retention agent which absorbs a deliquescence liquid generated by the moisture absorption of the deliquescent inorganic salt. The water retention agent is a hygroscopic material which is concrete sludge. Since the performance and price of a desiccant using deliquescent inorganic salts including calcium chloride are decided depending on the water retention agent storing the deliquescence liquid, concrete sludge which is subjected to disposal is used for the water retention agent to reduce costs.

Description

本発明は、乾燥剤や調湿剤として使用する吸湿性材料に関し、特に潮解液を回収する保水剤としてコンクリートスラッジを活用した吸湿性材料に関する。   The present invention relates to a hygroscopic material used as a desiccant or a humidity control agent, and particularly to a hygroscopic material utilizing concrete sludge as a water retention agent for recovering deliquescent liquid.

温暖湿潤気候に分類されるわが国では、乾燥剤が必要不可欠なものとなっている。乾燥剤は、化学的乾燥剤（化学反応により水と化合することで吸湿）と物理的乾燥剤（物質が変化せず毛細孔に水蒸気を吸着）とに分けられ、各々、特徴を有している。 In Japan, which is classified as a warm and humid climate, desiccants are indispensable. The desiccant is divided into chemical desiccant (moisture absorption by combining with water by chemical reaction) and physical desiccant (substance does not change and adsorbs water vapor into the pores of the hair), each having its own characteristics Yes.

例えば、シリカゲルはコロイド状ケイ酸で、表面積が非常に大きく、吸着現象により水分を吸収するもので、唯一、ＪＩＳ規格が定められている。安全性が高く、吸水速度、吸湿力も優れているが、価格が高い。Ａ型とＢ型の２種類があり、Ａ型は低湿度、Ｂ型は高湿度での吸湿力が優れている。また、Ｂ型は調湿機能を持っている。 For example, silica gel is colloidal silicic acid, has a very large surface area, and absorbs moisture by an adsorption phenomenon. The only JIS standard is defined. High safety, excellent water absorption speed and moisture absorption, but expensive. There are two types, A-type and B-type. A-type has excellent hygroscopicity at low humidity and B-type has high humidity. The B type has a humidity control function.

生石灰は、シリカゲルと共に最も多く使用されている乾燥剤である。吸湿率が高く、価格も安いが、水に接触すると発熱し、水溶液が強アルカリになるという、安全面での問題がある。 Quicklime is the most commonly used desiccant with silica gel. Although it has a high moisture absorption rate and is inexpensive, there is a safety problem that it generates heat when it comes in contact with water and the aqueous solution becomes a strong alkali.

塩化カルシウムなど潮解性無機塩類は、吸湿量が非常に大きいが、吸湿すると水溶液化（潮解水）するため、保水力の高い担体に浸み込ませて流動化、液漏れを無くした加工品が販売されている。 Deliquescent inorganic salts such as calcium chloride have a very high moisture absorption amount, but when they absorb moisture, they become aqueous solutions (deliquesce water), so that they can be soaked in a carrier with high water retention capacity to eliminate fluidization and leakage. Sold.

潮解水を吸水して流動化、液漏れを無くす方法としては、保水剤としてカオリン、ケイ砂、石灰石等を使用し、セメント等の水和硬化物で固めたもの（特許文献１参照）、セピオライト等無機質粉末を使用したもの（特許文献２参照）、カーボンブラックに無機金属塩を添着したもの（特許文献３参照）、木炭粉末を使用したもの（特許文献４参照）、澱粉を使用したもの（特許文献５参照）が報告されている。 As a method of absorbing fluid from deliquescent water and eliminating liquid leakage, kaolin, silica sand, limestone, etc. are used as a water retention agent and hardened with a hydrated hardened material such as cement (see Patent Document 1), sepiolite. Equivalent inorganic powder (see Patent Document 2), carbon black impregnated with an inorganic metal salt (see Patent Document 3), charcoal powder (see Patent Document 4), starch ( Patent Document 5) has been reported.

特公昭６２−３０８１５号公報Japanese Examined Patent Publication No. 62-30815 特開平１−１５５９３０号公報JP-A-1-155930 特開２００３−５３１２８号公報JP 2003-53128 A 特開２００７−７０１号公報Japanese Patent Laid-Open No. 2007-701 特開２００９−１３６７５７号公報JP 2009-136757 A

塩化カルシウムなどの潮解性無機塩類を使用した乾燥剤では、潮解液を蓄える保水剤によって、性能、価格が決る。上記特許文献１〜５で使用される保水剤は、いずれも市販品であり、高い吸湿能力を求めると価格も高いものとなっている。 For desiccants using deliquescent inorganic salts such as calcium chloride, the performance and price are determined by the water retention agent that stores the deliquescent solution. The water retention agents used in Patent Documents 1 to 5 are all commercially available products, and the price is high when high moisture absorption capacity is required.

そこで、本発明では、保水剤の価格を極力抑えることで高性能の乾燥剤を安く提供することを課題としている。 Therefore, an object of the present invention is to provide a high-performance desiccant at a low price by minimizing the price of the water retention agent.

そこで、本発明は、廃棄処分されているコンクリートスラッジを吸湿性材料の保水剤として活用することにより低コストで高い吸湿・調湿能力を有する吸湿性材料およびその製造方法並びに保水剤用コンクリートスラッジを提供するものである。 Therefore, the present invention provides a hygroscopic material having a high moisture absorption and humidity control capability at low cost, a manufacturing method thereof, and a concrete sludge for a water retention agent by utilizing the concrete sludge that has been disposed of as a water retention agent for the hygroscopic material. It is to provide.

本発明の特徴は、潮解性無機塩類の吸湿により発生する潮解液の回収に、産業廃棄物として廃棄処理を行っているコンクリートスラッジを活用することである。潮解液の回収に使用されるセピオライトは殆ど輸入品であり、産地により吸水量が変わり、１５０〜２２０％となっている。これに対し、コンクリートスラッジは、吸水量が１４０〜２００％で価格はセピオライトの１/１０以下で提供できる。 The feature of the present invention is to utilize concrete sludge which is disposed of as industrial waste for the recovery of the deliquescent liquid generated by moisture absorption of deliquescent inorganic salts. Sepiolite used for recovering the deliquescent solution is almost imported, and the amount of water absorption varies depending on the production area, which is 150-220%. On the other hand, concrete sludge can be provided at a water absorption of 140 to 200% and a price of 1/10 or less of sepiolite.

本願請求項１の発明は、潮解性無機塩と、該潮解性無機塩の吸湿により発生する潮解液を吸収する保水剤を含む吸湿性材料において、前記保水剤がコンクリートスラッジであることを特徴とする吸湿性材料である。 The invention of claim 1 of the present application is a hygroscopic material comprising a deliquescent inorganic salt and a water retention agent that absorbs the deliquescent liquid generated by moisture absorption of the deliquescent inorganic salt, wherein the water retention agent is concrete sludge, Hygroscopic material.

本願請求項２の発明は、前記潮解性無機塩が塩化カルシウム又は塩化マグネシウムであることを特徴とする吸湿性材料である。 The invention of claim 2 of the present application is the hygroscopic material, wherein the deliquescent inorganic salt is calcium chloride or magnesium chloride.

本願請求項３の発明は、潮解性無機塩と、該潮解性無機塩の潮解液を吸収する保水剤を含む吸湿性材料の製造方法において、塩酸とコンクリートスラッジとを混合して反応させた後、乾燥することを特徴とする吸湿性材料の製造方法である。
本願請求項４の発明は、潮解性無機塩の吸湿により発生する潮解液を吸収する保水剤用コンクリートスラッジである。 The invention of claim 3 of the present application is a method for producing a hygroscopic material containing a deliquescent inorganic salt and a water retention agent that absorbs the deliquescent liquid of the deliquescent inorganic salt, after mixing and reacting hydrochloric acid and concrete sludge. A method for producing a hygroscopic material, characterized by drying.
Invention of Claim 4 of this application is the concrete sludge for water retention agents which absorbs the deliquescent liquid which generate | occur | produces by the moisture absorption of a deliquescent inorganic salt.

保水剤として使用するコンクリートスラッジについて説明すると、コンクリート製品工場では、製造プラントのコンクリートミキサーや注入装置等の洗浄により生コンを含んだ洗浄水が発生し、この洗浄水は、工場内のスラッジ処理施設で骨材（砂利・砂）を分離し、スラッジ水ができる。このスラッジ水をさらにフィルタープレス等の脱水機で脱水し、上澄水と脱水ケーキとに分離するが、この脱水ケーキをコンクリートスラッジとよんでいる。 Concrete concrete sludge used as a water retention agent will be explained. In concrete product factories, washing water containing raw concrete is generated by washing concrete mixers and pouring devices in manufacturing plants, and this washing water is used at sludge treatment facilities in the factory. Separates aggregates (gravel and sand) and produces sludge water. This sludge water is further dehydrated with a dehydrator such as a filter press and separated into supernatant water and dehydrated cake. This dehydrated cake is called concrete sludge.

コンクリートスラッジは、廃棄物処理法上、汚泥に属し、そのままでは管理型の埋立て処分場への廃棄が義務付けられおり、大半が産業廃棄物として埋立て地に廃棄処理されている。このコンクリートスラッジの排出量は全国で年間３００万ｔとも言われ、廃棄に莫大な処理費用を要するとともに、管理型の埋立て処分場の残余年数を縮めるだけでコンクリート業界の大きな課題となっており、再資源化させる処理技術の開発が急がれているものである。 Concrete sludge belongs to sludge under the Waste Disposal Law, and as it is, it is obliged to dispose of it in a managed landfill. Most of it is disposed as landfill in industrial landfill. The amount of concrete sludge discharged is said to be 3 million tons per year nationwide, which requires enormous processing costs for disposal, and has become a major issue for the concrete industry just by reducing the remaining years of managed landfills. Therefore, development of processing technology to recycle is urgently needed.

コンクリートスラッジは、コンクリートを製造する時に用いられた各種材料の残渣で、未水和セメント粒子や水和生成物，骨材微粒分からなっており、１晩寝かせて水和反応が終ったものをフィルタープレス等で回収している。 Concrete sludge is a residue of various materials used in the production of concrete, which consists of unhydrated cement particles, hydrated products, and aggregate fines. Collected with a press.

コンクリートスラッジの特徴は、吸水力、保水力が高く、調湿や消臭機能も持ち合わせていることである。 The feature of concrete sludge is that it has high water absorption and water retention, and has humidity control and deodorizing functions.

本発明で潮解性無機塩類と混合させるコンクリートスラッジは、乾燥させたものを利用することが前提となる。潮解性無機塩類、コンクリートスラッジをインパクトクラッシャーで破砕し、φ０．７ｍｍメッシュの篩を通したものをミキサーで混合する。混合割合は、質量比で潮解性無機塩類１００部に対してコンクリートスラッジ１３０部〜１２００部であり、好ましくは１５０部〜６００部である。コンクリートスラッジが１２００部より多いと高い吸湿性が得られず、コンクリートスラッジ本来の吸湿性となる。これでも３００ｇ／ｍ２は確保できる。６００部で市販のシリカゲルと同等となる。１３０部より少ないと潮解液が漏出することがある。この時使用したコンクリートスラッジの含水率は１５％である。 The concrete sludge mixed with the deliquescent inorganic salt in the present invention is premised on the use of a dried one. The deliquescent inorganic salts and concrete sludge are crushed with an impact crusher, and then passed through a φ0.7 mm mesh sieve and mixed with a mixer. The mixing ratio is 130 to 1200 parts, preferably 150 to 600 parts, of concrete sludge with respect to 100 parts of deliquescent inorganic salts by mass ratio. When the amount of concrete sludge is more than 1200 parts, high hygroscopicity cannot be obtained, and the original hygroscopic property of concrete sludge is obtained. Even in this case, 300 g / m 2 can be secured. 600 parts are equivalent to commercially available silica gel. If it is less than 130 parts, the deliquescent liquid may leak. The moisture content of the concrete sludge used at this time is 15%.

また、潮解性無機塩類、コンクリートスラッジの粒径は、ここではφ０．７ｍｍメッシュを使用しているが、吸湿により生じた潮解液を保水剤で十分保持させるためには、湿気との接触面積が大きくなるよう粒径は小さいほうがよく、２ｍｍ以下が望ましい。 In addition, the particle size of deliquescent inorganic salts and concrete sludge is 0.7 mm mesh here, but in order to sufficiently retain the deliquescent liquid generated by moisture absorption with a water retention agent, the contact area with moisture is The particle size should be small so as to increase, and 2 mm or less is desirable.

潮解性無機塩類とコンクリートスラッジの配合比で吸湿量が調整できるため、目標とする吸湿量に合わせて配合を調節することで吸湿量が制御できることが大きなメリットと言える。   Since the amount of moisture absorption can be adjusted by the mixing ratio of the deliquescent inorganic salts and the concrete sludge, it can be said that it is a great merit that the amount of moisture absorption can be controlled by adjusting the combination according to the target moisture absorption amount.

本発明の吸湿性材料の製造方法は、コンクリート製品工場でフィルタープレス等の脱水機から排出された脱水ケーキを活用するもので、脱水ケーキに塩酸を加え、乾燥、破砕して製造する。コンクリートスラッジの主成分は、シリカと水酸化カルシウムであり、塩酸処理することで水酸化カルシウムを塩化カルシウムに改質するものである。   The method for producing a hygroscopic material of the present invention utilizes dehydrated cake discharged from a dehydrator such as a filter press in a concrete product factory, and adds hydrochloric acid to the dehydrated cake, which is dried and crushed. The main components of concrete sludge are silica and calcium hydroxide, and the calcium hydroxide is modified to calcium chloride by treatment with hydrochloric acid.

質量比で脱水ケーキ１００部に３５％希塩酸５部〜３５部、水０部〜４００部をミキサーで混合する。水を加えることによる吸湿量の差は殆どないため、混合しやすい程度に入れる。混合したものを乾燥、破砕して製品とする。乾燥方法は、天日、熱風、オートクレーブのいずれでも問題ないが、オートクレーブ養生すると１．２〜１．５倍吸湿量が増える。 In a mass ratio, 5 parts to 35 parts of 35% dilute hydrochloric acid and 0 part to 400 parts of water are mixed with 100 parts of dehydrated cake with a mixer. Since there is almost no difference in the amount of moisture absorption due to the addition of water, it is added so that it can be easily mixed. The mixture is dried and crushed to obtain a product. The drying method may be any of sun, hot air, and autoclave, but when the autoclave is cured, the moisture absorption increases by 1.2 to 1.5 times.

脱水ケーキの含水率は、装置により変わるが１１０％〜１６０％程度で、使用したものは１４０％であった。 Although the moisture content of the dewatered cake varied depending on the apparatus, it was about 110% to 160%, and 140% was used.

本発明は、潮解性無機塩を使用した吸湿性材料に、保水剤としてコンクリート製造工程で発生するコンクリートスラッジを利用するため、従来、廃棄処分されていたコンクリートスラッジの有効利用を図ることができるとともに、廃棄処分費用を削減することができる。また、保水剤の原料費が実質的にゼロになるので、乾燥剤の低コスト化を図ることができる。   The present invention uses concrete sludge generated in the concrete manufacturing process as a water retention agent for the hygroscopic material using the deliquescent inorganic salt, so that it is possible to effectively use the concrete sludge that has been disposed of in the past. , Can reduce disposal costs. In addition, since the raw material cost of the water retention agent becomes substantially zero, the cost of the desiccant can be reduced.

本発明は、優れた吸湿力に加え、Ｂ型のシリカゲルと同様に調湿能力を持ち合わせているため、調湿剤としても十分活用できる。過湿状態となっても、加熱して乾燥させることで再生可能でもあり適用範囲が大きくなる。 Since the present invention has not only excellent hygroscopic power but also a humidity control ability similar to B-type silica gel, it can be sufficiently utilized as a humidity control agent. Even in an excessively humid state, it can be regenerated by heating and drying, and the application range becomes large.

また、本発明は、保水剤として使用するコンクリートスラッジの主成分は水酸化カルシウムであり、乾燥の過程で二酸化炭素を吸収し、炭酸カルシウムに改質するため、ＣＯ２固定も可能となる。例えばコンクリートスラッジ中の水酸化カルシウム含有量を３０質量％とすると、炭酸化によるＣＯ２固定量は、コンクリートスラッジ１トンあたり、約０．２トンとなり、この点からも地球環境保全にも貢献できる。 In the present invention, the main component of concrete sludge used as a water retention agent is calcium hydroxide, which absorbs carbon dioxide in the course of drying and reforms it into calcium carbonate, so that CO 2 fixation is also possible. For example, if the content of calcium hydroxide in concrete sludge is 30% by mass, the amount of CO 2 fixed by carbonation is about 0.2 tons per ton of concrete sludge, which can also contribute to global environmental conservation. .

乾燥剤の吸湿能力（吸湿等温線）を示すグラフである。It is a graph which shows the moisture absorption capability (moisture absorption isotherm) of a desiccant. 塩化カルシウム添加量による吸放湿量の変化を示すグラフである。It is a graph which shows the change of the moisture absorption / release amount by calcium chloride addition amount. 塩酸添加量による吸放湿量の変化を示すグラフである。It is a graph which shows the change of the moisture absorption / release amount by hydrochloric acid addition amount.

以下、実施例に基づき本発明の実施の形態を説明する。   Embodiments of the present invention will be described below based on examples.

塩化カルシウム（粒状）をインパクトクラッシャーにてφ０．７ｍｍメッシュで破砕、コンクリートスラッジは、１０５℃で１晩乾燥させたものをインパクトクラッシャーにてφ０．７ｍｍメッシュで破砕したものを使用した。コンクリートスラッジは、２つの工場分２種類を使用した。塩化カルシウムとコンクリートスラッジの混合比（質量）は３：７と４：６の２種類とした。比較例として、特許文献２で紹介された１：２で配合したものを使用した。また、コンクリートスラッジを塩酸（３５％濃度）で処理し乾燥させたもの2種類使用した。サンプルａ〜ｆと比較例は表１に示すとおりである。

Figure 2013226523
Calcium chloride (granular) was crushed with an impact crusher with a φ0.7 mm mesh, and concrete sludge was dried at 105 ° C. overnight and crushed with an impact crusher with a φ0.7 mm mesh. Two types of concrete sludge were used for two factories. The mixing ratio (mass) of calcium chloride and concrete sludge was two types of 3: 7 and 4: 6. As a comparative example, the one blended at 1: 2 introduced in Patent Document 2 was used. Two types of concrete sludge treated with hydrochloric acid (35% concentration) and dried were used. Samples a to f and comparative examples are as shown in Table 1.
Figure 2013226523

この比率で混合した乾燥剤を１００ｇずつ、容器に入れ、２０℃、９０％ＲＨの条件下で１４日間吸湿させ、質量、潮解液の漏れを確認、さらに２０℃、５０％ＲＨで１４日間放湿させて質量を測定した。その時の吸湿量は表２のとおりである。いずれのサンプルも潮解液の漏れは確認されなかった。
なお、サンプルａ〜ｆについては、市販の除湿剤の同じ容器を、比較例は浅型角バット（195mm×155mm×30mm）を使用したもので吸湿量の差は表面積によるものである。

Figure 2013226523
100 g of desiccant mixed at this ratio is put into a container and absorbed for 14 days under conditions of 20 ° C. and 90% RH. Mass and deliquescent leakage are confirmed. Wet the sample and measure the mass. The moisture absorption at that time is as shown in Table 2. None of the samples were found to leak deliquescence.
In addition, about samples af, the same container of a commercially available dehumidifier is used, the comparative example uses a shallow square bat (195 mm x 155 mm x 30 mm), and the difference in moisture absorption is due to the surface area.
Figure 2013226523

この実施例では、コンクリートスラッジを保水剤に用いた乾燥剤の吸湿能力を測定した。本発明品サンプル４種と市販されている乾燥剤２種について、恒温恒湿器を用いて行った。   In this example, the moisture absorption capacity of a desiccant using concrete sludge as a water retention agent was measured. About 4 types of this invention product samples and 2 types of commercially available desiccants, it carried out using the thermo-hygrostat.

使用したサンプルは表３のとおりで各々サンプルを１０ｇ、内径８６ｍｍのシャーレにいれて、恒温恒湿器の室内温度を２５℃一定とし、表４の吸湿性能測定プログラムに従って湿度を４０％から９０％まで上げて、水分吸収による質量増加を経時的に測定した。

Figure 2013226523
Figure 2013226523
 The samples used are as shown in Table 3. Each sample is placed in a petri dish with 10 g and an inner diameter of 86 mm, the room temperature of the thermo-hygrostat is kept at 25 ° C., and the humidity is 40% to 90% according to the hygroscopic performance measurement program shown in Table 4. The mass increase due to moisture absorption was measured over time.
Figure 2013226523
Figure 2013226523

図１が測定結果より作図した吸湿等温線である。サンプルｂより、塩化カルシウムの特徴である周囲の相対湿度の上昇につれて、より多くの水分を吸収することがわかる。また、サンプルｃ、ｄのスラッジを塩酸処理したものは、塩化カルシウム添加より高湿度域での吸湿量が多くなることが分かった。サンプルｂ、ｃ、ｄの吸湿量は、サンプルに含まれる塩化カルシウムの量で決ることから、塩化カルシウムの添加量を増やすことで低い相対湿度下でも利用出来ることが想定できる。   FIG. 1 is a moisture absorption isotherm drawn from the measurement results. Sample b shows that more moisture is absorbed as the ambient relative humidity, which is characteristic of calcium chloride, increases. Moreover, it turned out that what absorbed the sludge of sample c and d increased the moisture absorption amount in a high-humidity area compared with calcium chloride addition. Since the amount of moisture absorption of samples b, c, and d is determined by the amount of calcium chloride contained in the sample, it can be assumed that it can be used even under low relative humidity by increasing the amount of calcium chloride added.

この実施例は、コンクリートスラッジに加える塩化カルシウムの添加量に応じて、出来た乾燥剤の調湿能力の変化を調査したものである。乾燥剤に対する塩化カルシウム配合比率を０％、１０％、２０％、３０％として乾燥剤を得た。   In this example, changes in the humidity control ability of the resulting desiccant were investigated in accordance with the amount of calcium chloride added to the concrete sludge. The desiccant was obtained with the calcium chloride blending ratio of 0%, 10%, 20% and 30% with respect to the desiccant.

得られた乾燥剤を３ｍｍの篩いにかけ、内径８６ｍｍのシャーレに充填し、表面積をほぼ同一にして恒温恒湿器に入れ、吸放湿性試験を行った。吸放湿性試験は、ＪＩＳ Ａ６９０９（建築用仕上塗材）７．３２吸放湿性試験に基づき、恒温恒湿器の容器内温度を２５℃一定とし、１日毎に湿度を５０％と９０％で交互に切り替え、吸放湿量の変化を測定して、吸放湿量（ｇ／ｍ２）を算出した。表５が測定した吸放湿量である。図２より、調湿機能が確認できた。

Figure 2013226523
The obtained desiccant was passed through a 3 mm sieve, filled into a petri dish with an inner diameter of 86 mm, placed in a thermo-hygrostat with substantially the same surface area, and a moisture absorption / release test was conducted. The moisture absorption / release test is based on JIS A6909 (finishing coating material for construction) 7.32 moisture absorption / release test, and the temperature inside the thermostatic chamber is constant at 25 ° C, and the humidity is 50% and 90% every day. It switched alternately and measured the moisture absorption / release amount, and calculated the moisture absorption / release amount (g / m 2 ). Table 5 shows the measured moisture absorption and desorption amounts. From FIG. 2, the humidity control function was confirmed.
Figure 2013226523

この実施例は、コンクリートスラッジ（脱水ケーキ：含水率１４０％）に加える塩酸の添加量に応じて得られた乾燥剤の調湿能力の変化を調査したものである。   In this example, the change in the humidity control ability of the desiccant obtained according to the amount of hydrochloric acid added to the concrete sludge (dehydrated cake: water content 140%) was investigated.

この実施例では、コンクリートスラッジ１００質量％に対し、塩酸の混合量（質量％）を０％、５％、１０％、２０％、４０％として混合し、１０５℃で１晩乾燥させた後、インパクトクラッシャーでφ０．７ｍｍメッシュに粉砕して乾燥剤を得た。これを内径８６ｍｍのシャーレに充填し、表面積をほぼ同一にして恒温恒湿器に入れ、吸放湿性試験を行った。吸放湿性試験は、ＪＩＳ Ａ６９０９（建築用仕上塗材）７．３２吸放湿性試験に基づき実施し、吸放湿量（ｇ／ｍ２）を算出した。表６が吸放湿量である。図３より、調湿機能が確認できた。

Figure 2013226523
In this example, the mixing amount (mass%) of hydrochloric acid is 0%, 5%, 10%, 20%, 40% with respect to 100% by mass of concrete sludge, and after drying at 105 ° C. overnight, A desiccant was obtained by pulverizing to a 0.7 mm mesh with an impact crusher. This was filled into a petri dish having an inner diameter of 86 mm, placed in a thermo-hygrostat with substantially the same surface area, and a moisture absorption / release test was conducted. The moisture absorption / release test was carried out based on the JIS A6909 (finishing coating material for construction) 7.32 moisture absorption / release test, and the moisture absorption / release amount (g / m 2 ) was calculated. Table 6 shows the amount of moisture absorbed and released. From FIG. 3, the humidity control function was confirmed.
Figure 2013226523

Claims (4)

潮解性無機塩と、該潮解性無機塩の吸湿により発生する潮解液を吸収する保水剤を含む吸水性材料において、前記保水剤がコンクリートスラッジであることを特徴とする吸湿性材料。 A water-absorbing material comprising a deliquescent inorganic salt and a water retention agent that absorbs the deliquescent liquid generated by moisture absorption of the deliquescent inorganic salt, wherein the water retention agent is concrete sludge. 前記潮解性無機塩が塩化カルシウム又は塩化マグネシウムであることを特徴とする請求項１に記載の吸湿性材料。 The hygroscopic material according to claim 1, wherein the deliquescent inorganic salt is calcium chloride or magnesium chloride. 潮解性無機塩と、該潮解性無機塩の潮解液を吸収する保水剤を含む吸湿性材料の製造方法において、塩酸とコンクリートスラッジとを混合して反応させた後、乾燥することを特徴とする吸湿性材料の製造方法。 In a method for producing a hygroscopic material including a deliquescent inorganic salt and a water retention agent that absorbs the deliquescent liquid of the deliquescent inorganic salt, hydrochloric acid and concrete sludge are mixed and reacted, and then dried. Method for producing hygroscopic material. 潮解性無機塩の吸湿により発生する潮解液を吸収する保水剤用コンクリートスラッジ。   Concrete sludge for water retention agent that absorbs deliquescent liquid generated by moisture absorption of deliquescent inorganic salts.
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CN114806159A (en) * 2022-05-10 2022-07-29 苏州市安美材料科技有限公司 Flame-retardant moisture-absorbing nylon composite material and preparation method thereof

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CN114806159A (en) * 2022-05-10 2022-07-29 苏州市安美材料科技有限公司 Flame-retardant moisture-absorbing nylon composite material and preparation method thereof

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