JP6892062B2 - Manufacturing method of rust preventive material for lightweight cellular concrete reinforcing bars - Google Patents
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Description
本発明は軽量気泡コンクリート補強鉄筋用防錆材の製造方法に関する。 The present invention relates to a method for producing a rust preventive material for lightweight cellular concrete reinforcing bars.
軽量気泡コンクリート（以下、ＡＬＣとも称する）は内部に気孔を含むため、絶乾かさ比重が０.５程度と非常に軽量でありながら、比較的高い強度を有している。ＡＬＣは更に耐火性、断熱性、及び施工性にも優れており、ＡＬＣパネルの形態で壁、屋根、床などの建築部材として広く使用されている。このＡＬＣパネルは、板厚１００ｍｍを標準とする板厚７５〜１２５ｍｍのパネル形状が主流であるが、板厚３７〜５０ｍｍの住宅用うす型のパネルや、板厚１５０ｍｍ以上のパネルも作製されている。 Since lightweight cellular concrete (hereinafter, also referred to as ALC) contains pores inside, it has a relatively high strength while being extremely lightweight with an absolute dryness specific gravity of about 0.5. ALC is also excellent in fire resistance, heat insulation, and workability, and is widely used as a building member such as a wall, a roof, and a floor in the form of an ALC panel. The mainstream of this ALC panel is a panel shape with a plate thickness of 75 to 125 mm with a plate thickness of 100 mm as a standard, but thin-shaped panels for houses with a plate thickness of 37 to 50 mm and panels with a plate thickness of 150 mm or more are also manufactured. There is.
上記のＡＬＣパネルは、一般に珪石や珪砂などの珪酸質原料と、セメントや生石灰などの石灰質原料とを主原料とし、これに石膏や界面活性剤などの添加物を繰り返し原料と共に加え、更に適量の水と発泡剤であるアルミニウム粉末とを加えて反応させることで作製することができる。具体的には、これら全ての原料を鋳込ミキサーで攪拌混合し、得られたスラリーを補強用の鉄筋が設けられた型枠内に流し込む。型枠内に流し込まれたスラリーは、アルミニウム粉末の反応で発生した水素ガスによって徐々に膨張し、更にセメント及び生石灰がスラリー中の水を取り込んで水和物を生成することによって硬化していく。これにより、スラリーは型枠内で徐々に流動性のないケーキ状の半硬化体に変化する。なお、発生した水素ガスは気泡安定剤により球状の気泡として安定化する。 The above ALC panel generally uses a siliceous raw material such as silica stone or silica sand and a calcareous raw material such as cement or fresh lime as main raw materials, and additives such as gypsum and surfactant are repeatedly added together with the raw materials to further add an appropriate amount. It can be produced by adding water and aluminum powder which is a foaming agent and reacting them. Specifically, all of these raw materials are stirred and mixed with a casting mixer, and the obtained slurry is poured into a mold provided with reinforcing bars. The slurry poured into the mold gradually expands due to the hydrogen gas generated by the reaction of the aluminum powder, and the cement and quicklime take in the water in the slurry to form hydrate and harden. As a result, the slurry gradually changes into a cake-like semi-cured body having no fluidity in the mold. The generated hydrogen gas is stabilized as spherical bubbles by the bubble stabilizer.
この半硬化体を型枠から取り出してオートクレーブに装入し、１８０℃、１０気圧の高温高圧水蒸気で数時間かけて養生する。この養生過程において珪石などの珪酸質原料とセメントや生石灰などの石灰質原料から、珪酸カルシウム水和物のトバモライトが生成され、機械的強度の高いＡＬＣが生成する。このようにして作製されるＡＬＣパネルは、内部に気孔を有し且つ鉄筋で補強されているので軽量で且つ高い強度を有している。しかし、一般的にＡＬＣパネルは体積の８０％程度を気孔が占めているため、この気孔を経由して外部の水分がパネル内部に侵入しやすいうえ、ＡＬＣは通常のコンクリートとは異なり弱アルカリ性であるため、ＡＬＣパネル内部に埋設されている補強用鉄筋は腐食されやすい状態にある。 This semi-cured product is taken out from the mold, charged into an autoclave, and cured with high-temperature high-pressure steam at 180 ° C. and 10 atm for several hours. In this curing process, tovamorite, which is a calcium silicate hydrate, is produced from a siliceous raw material such as silica stone and a calcareous raw material such as cement and quicklime, and ALC having high mechanical strength is produced. The ALC panel produced in this manner has pores inside and is reinforced with reinforcing bars, so that it is lightweight and has high strength. However, since pores occupy about 80% of the volume of ALC panels in general, external moisture easily penetrates into the panel through these pores, and ALC is weakly alkaline unlike ordinary concrete. Therefore, the reinforcing bars embedded inside the ALC panel are in a state of being easily corroded.
そこで、補強用鉄筋には予め表面に防錆処理が施されている。防錆処理は補強鉄筋を防錆液に浸漬させて防錆膜を形成する方法が一般的であるため、防錆液は防錆性に優れていることに加えて粘度やチクソトロピー性などの特性が経時変化しにくい優れた安定性を有していることが望ましい。このような安定性や防錆性に優れた防錆材の製造方法として、例えば特許文献１には防錆材のチクソトロピーインデックス値を１.８〜２.５の範囲内に規定した軽量気泡コンクリート補強鉄筋用防錆材の製造方法が開示されている。また、特許文献２には平均粒子径８〜３０μｍ、空気透過法による比表面積２,０００〜５０,０００ｃｍ２／ｇの炭酸カルシウム粉末を用いることで粉末骨材の粒径を規定した軽量気泡コンクリート補強鉄筋用防錆材の製造方法が開示されている。 Therefore, the surface of the reinforcing bar is rust-proofed in advance. Since the rust preventive treatment is generally performed by immersing the reinforcing bar in the rust preventive liquid to form a rust preventive film, the rust preventive liquid has excellent rust preventive properties as well as characteristics such as viscosity and thixotropic properties. Is desirable to have excellent stability that does not easily change over time. As a method for producing a rust preventive material having such excellent stability and rust preventive properties, for example, Patent Document 1 defines a thixotropy index value of the rust preventive material in the range of 1.8 to 2.5, which is a lightweight cellular concrete. A method for producing a rust preventive material for reinforcing bars is disclosed. Further, in Patent Document 2, lightweight cellular concrete in which the particle size of powdered aggregate is defined by using calcium carbonate powder having an average particle size of 8 to 30 μm and a specific surface area of 2,000 to 50,000 cm 2 / g by an air permeation method. A method for producing a rust preventive material for reinforcing bars is disclosed.
しかしながら、防錆剤は粘度等の物性がばらつきやすく、従来の製造方法で作製した防錆材で塗膜した防錆膜を有する鉄筋で補強されたＡＬＣは品質が大きくばらつくことがあった。本発明はかかる従来のＡＬＣパネル補強用鉄筋用防錆材製造が抱える問題点に鑑みてなされたものであり、安定性や防錆性に優れた軽量気泡コンクリート補強鉄筋用防錆材を提供することを目的としている。 However, the rust preventives tend to vary in physical properties such as viscosity, and the quality of ALC reinforced with reinforcing bars having a rust preventive film coated with a rust preventive material produced by a conventional manufacturing method may vary greatly. The present invention has been made in view of the problems of the conventional production of a rust preventive material for reinforcing bars for ALC panels, and provides a rust preventive material for lightweight cellular concrete reinforcing bars having excellent stability and rust prevention properties. The purpose is.
上記目的を達成するため、本発明者はＡＬＣパネル補強用鉄筋用防錆材の製造方法において鋭意研究を重ねた結果、混合のベースとなる液体原料に液体分の原料と固形分の原料とを別々に添加し、それぞれ異なる撹拌速度でせん断作用を有する撹拌機を用いて撹拌混合することで安定性や防錆性に優れた軽量気泡コンクリート補強鉄筋用防錆材を製造できることを見出し、本発明を完成するに至った。 In order to achieve the above object, the present inventor has conducted extensive research on a method for producing a rust preventive material for reinforcing bars for ALC panels, and as a result, has added a liquid raw material and a solid raw material to the liquid raw material as the base of mixing. We have found that a rust preventive material for lightweight cellular concrete reinforcing bars with excellent stability and rust prevention can be produced by adding them separately and stirring and mixing them using a stirrer having a shearing action at different stirring speeds. Has been completed.
すなわち、本発明の軽量気泡コンクリート補強鉄筋用防錆材の製造方法は、せん断作用を有する撹拌機で撹拌が行われているアスファルト水性エマルジョンに対して、液体分原料のＳＢＲ水性エマルジョン及び粘度調整用の水を添加して混合した後に固形分原料の骨材粉末及びｐＨ調整用の添加剤を添加して混合する軽量気泡コンクリート補強鉄筋用防錆材の製造方法であって、前記液体分原料の混合時の撹拌速度を１２０〜２００ｒｐｍの範囲内とし、この液体分原料の混合時の撹拌速度よりも前記固形分原料の混合時の撹拌速度を４０〜５０ｒｐｍ速くすることを特徴とする。 That is, the method for producing a rust preventive material for lightweight cellular concrete reinforced reinforcing bars of the present invention is for adjusting the viscosity of an aqueous emulsion of SBR as a raw material for a liquid component, as opposed to an aqueous emulsion of asphalt that is stirred by a stirrer having a shearing action. This is a method for producing a rust preventive material for a lightweight cellular concrete reinforced reinforcing bar, which is obtained by adding and mixing aggregate powder of a solid content raw material and an additive for pH adjustment after adding and mixing the water of the above liquid content raw material. The stirring speed at the time of mixing is set in the range of 120 to 200 rpm, and the stirring speed at the time of mixing the solid content raw material is 40 to 50 rpm faster than the stirring speed at the time of mixing the liquid component raw material.
本発明によれば、安定性や防錆性に優れた軽量気泡コンクリート補強鉄筋用防錆材を製造することができる。 According to the present invention, it is possible to manufacture a rust preventive material for lightweight aerated concrete reinforcing reinforcing bars having excellent stability and rust preventive properties.
以下、本発明の軽量気泡コンクリート補強鉄筋用防錆材の製造方法の実施形態について具体的に説明する。この本発明の実施形態の防錆材の製造方法は、スチレンブタジエンゴム（以降ＳＢＲと称する）を主成分とするＳＢＲ水性エマルジョンと、アスファルトを主成分とするアスファルト水性エマルジョンと、骨材粉末とを主原料として用い、更に消石灰などのｐＨ調整用の添加剤と粘度調整用の水とを副原料として用いる。これら原料を所定の配合割合で撹拌混合することで防錆材を作製することができる。 Hereinafter, embodiments of the method for producing a rust preventive material for lightweight cellular concrete reinforcing bars of the present invention will be specifically described. In the method for producing a rust preventive material according to the embodiment of the present invention, an SBR aqueous emulsion containing styrene-butadiene rubber (hereinafter referred to as SBR) as a main component, an asphalt aqueous emulsion containing asphalt as a main component, and an aggregate powder are used. It is used as a main raw material, and further, an additive for adjusting pH such as slaked lime and water for adjusting viscosity are used as auxiliary raw materials. A rust preventive material can be produced by stirring and mixing these raw materials at a predetermined blending ratio.
上記のＳＢＲ水性エマルジョン、アスファルト水性エマルジョン、及びｐＨ調整用の添加物の具体的な種類には特に限定がなく、市販のものを用いることができる。また、上記の骨材粉末としては、例えば炭酸カルシウム、珪石、ポルトランドセメント、珪藻土から選ばれた少なくとも１種を用いることが好ましく、また、骨材粉末の粒径は、０.１μｍ以上５００μｍ以下であるのが好ましい。この粒径が０.１μｍ未満では防錆材の骨材としての機能を発揮せず過剰に増粘するおそれがあり、逆に５００μｍを超えると防錆膜に骨材の塊が付着して発錆等の原因となるおそれがある。 The specific types of the above-mentioned SBR aqueous emulsion, asphalt aqueous emulsion, and additive for pH adjustment are not particularly limited, and commercially available ones can be used. Further, as the above-mentioned aggregate powder, it is preferable to use at least one selected from, for example, calcium carbonate, silica stone, Portland cement and diatomaceous earth, and the particle size of the aggregate powder is 0.1 μm or more and 500 μm or less. It is preferable to have it. If this particle size is less than 0.1 μm, the rust preventive material does not function as an aggregate and may become excessively thickened. On the contrary, if it exceeds 500 μm, a lump of aggregate adheres to the rust preventive film and occurs. It may cause rust.
上記した原料の配合割合としては、固形分原料の骨材粉末１００質量部に対して、液体分原料のＳＢＲ水性エマルジョンが２５〜２６質量部、液体分原料のアスファルト水性エマルジョンが２５〜２６重量部、液体分原料の粘度調整用の水が２０〜２５質量部、及び固形分原料のｐＨ調整用の添加物が３〜４質量部とすることが好ましい。 As for the mixing ratio of the above-mentioned raw materials, 25 to 26 parts by mass of the SBR aqueous emulsion of the liquid content raw material and 25 to 26 parts by weight of the asphalt aqueous emulsion of the liquid content raw material are used with respect to 100 parts by mass of the aggregate powder of the solid content raw material. It is preferable that the amount of water for adjusting the viscosity of the liquid material is 20 to 25 parts by mass, and the amount of the additive for adjusting the pH of the solid material is 3 to 4 parts by mass.
このＳＢＲ水性エマルジョンの配合割合が２５質量部未満では造膜性が悪くなって防錆膜が剥がれ易くなり、逆に２６質量部を超えると樹脂分が過剰になるため防錆膜にヒビ割れが生じやすくなるので好ましくない。また、アスファルト水性エマルジョンの配合割合が２５質量部未満では防錆膜に靭性がなくなってヒビ割れし易くなり、逆に２６質量部を超えるとｐＨ調整が困難になるので好ましくない。また、粘度調整用の水の配合割合が２０質量部未満では防錆材の粘度が高くなり過ぎるため造膜時に厚膜になりやすく、逆に２５質量部を超えると防錆材の粘度が低くなり過ぎるため造膜時に薄膜になりやすいので好ましくない。 If the blending ratio of this SBR aqueous emulsion is less than 25 parts by mass, the film-forming property deteriorates and the rust-preventive film is easily peeled off. On the contrary, if it exceeds 26 parts by mass, the resin content becomes excessive and the rust-preventive film cracks. It is not preferable because it tends to occur. Further, if the blending ratio of the asphalt aqueous emulsion is less than 25 parts by mass, the rust preventive film loses toughness and easily cracks, and conversely, if it exceeds 26 parts by mass, it becomes difficult to adjust the pH, which is not preferable. Further, if the mixing ratio of water for adjusting the viscosity is less than 20 parts by mass, the viscosity of the rust preventive material becomes too high, so that a thick film tends to be formed during film formation, and conversely, if it exceeds 25 parts by mass, the viscosity of the rust preventive material is low. It is not preferable because it becomes too thin and tends to become a thin film during film formation.
本発明の実施形態の防錆材の製造方法では、上記混合時のベースとなる液体分原料のアスファルト水性エマルジョンに対して、タービン翼等の強いせん断力を発生させる作用を有する撹拌機を用いて撹拌しながら、該アスファルト水性エマルジョンに液体分原料及び固形分原料をこの順に投入して混合する。その際、液体分原料を投入して混合する時の撹拌速度よりも固形分原料を投入して混合する時の撹拌速度を速くする。具体的には、液体分原料の混合時の撹拌速度を１２０〜２００ｒｐｍの範囲内とし、この液体分原料の混合時の撹拌速度よりも固形分原料の混合時の撹拌速度を４０〜５０ｒｐｍ速くする。これにより安定性及び防錆性に優れた防錆材を作製することができる。 In the method for producing a rust preventive material according to the embodiment of the present invention, a stirrer having an action of generating a strong shearing force such as a turbine blade is used for the asphalt aqueous emulsion of the liquid component raw material which is the base at the time of mixing. While stirring, the liquid component raw material and the solid content raw material are added to the asphalt aqueous emulsion in this order and mixed. At that time, the stirring speed when the solid raw material is charged and mixed is made faster than the stirring speed when the liquid raw material is charged and mixed. Specifically, the stirring speed at the time of mixing the liquid component material is set in the range of 120 to 200 rpm, and the stirring speed at the time of mixing the solid content raw material is 40 to 50 rpm faster than the stirring speed at the time of mixing the liquid component raw material. .. As a result, a rust preventive material having excellent stability and rust preventive properties can be produced.
ベースとなる液体分原料を攪拌機で撹拌しながら液体分原料及び固形分原料をこの順で投入して調合する際の当該撹拌機の回転数を種々に変えて複数の軽量気泡コンクリート補強鉄筋用防錆材を作製し、それらの各々が塗膜された補強用鉄筋を内部に含むＡＬＣパネルを作製してその防錆性を評価した。具体的に説明すると、先ず固形分原料の骨材粉末１００質量部に対して、液体分原料のＳＢＲ水性エマルジョンが２５質量部、液体分原料のアスファルト水性エマルジョンが２５質量部、液体分原料の粘度調整用の水が２０質量部、固形分原料のｐＨ調整用の消石灰が３質量部の配合割合となるようにそれぞれ秤量された原料を用意した。 While stirring the base liquid raw material with a stirrer, the liquid component raw material and the solid content raw material are added in this order and mixed, and the rotation speed of the stirrer is variously changed to prevent a plurality of lightweight cellular concrete reinforcing bars. A rust material was prepared, and an ALC panel containing reinforcing bars coated with each of them was prepared and its rust prevention property was evaluated. Specifically, first, with respect to 100 parts by mass of aggregate powder as a solid content material, 25 parts by mass of an SBR aqueous emulsion as a liquid component, 25 parts by mass as an asphalt aqueous emulsion as a liquid material, and the viscosity of the liquid material. Raw materials were weighed so that 20 parts by mass of water for adjustment and 3 parts by mass of slaked lime for adjusting the pH of the solid content raw material were mixed.
なお、ＳＢＲ水性エマルジョンには株式会社イーテック製の商品名ＫＴ９６００Ｃを用い、アスファルト水性エマルジョンには東亜道路工業株式会社製の商品名ＳＭ乳剤を用い、骨材粉末には菱光石灰株式会社製の重質炭酸カルシウム粉末を用いた。次に、混合時のベースとなるアスファルト水性エマルジョンを容器に入れて株式会社井上製作所製の撹拌機（型番：ＤＨＣ）で撹拌しながら上記の液体分原料及び固形分原料を順次投入して軽量気泡コンクリート補強鉄筋用の防錆材を製造した。 The SBR aqueous emulsion uses the trade name KT9600C manufactured by E-Tech Co., Ltd., the asphalt aqueous emulsion uses the trade name SM emulsion manufactured by Toa Road Industry Co., Ltd., and the aggregate powder uses the heavy weight manufactured by Ryoko Lime Co., Ltd. Quality Calcium carbonate powder was used. Next, the asphalt aqueous emulsion, which is the base for mixing, is placed in a container, and the above liquid and solid raw materials are sequentially added while stirring with a stirrer (model number: DHC) manufactured by Inoue Seisakusho Co., Ltd. to create lightweight cells. Manufactured a rust preventive material for concrete reinforcing bars.
その際、液体分原料を投入して混合する際の撹拌機の回転数は５０〜２５０ｒｐｍの範囲内で変化させ、固形分原料を投入して混合する際の撹拌機の回転数は液体分原料を投入して混合する時よりも４０〜１５０ｒｐｍ速くした。このようにして試料１〜６の軽量気泡コンクリート補強鉄筋用防錆材を調合した。得られた各試料の防錆材の粘度及びチクソトロピー性をリオン株式会社製の回転粘度計であるビスコテスターＶＴ−０４Ｋを用いて測定し、貯蔵安定性について７日間の静置の後の沈降性（すなわち沈降による相分離の有無）を目視にて確認することで評価した。 At that time, the rotation speed of the stirrer when the liquid raw material is charged and mixed is changed within the range of 50 to 250 rpm, and the rotation speed of the stirrer when the solid raw material is charged and mixed is the liquid raw material. Was 40 to 150 rpm faster than when the mixture was added and mixed. In this way, the rust preventive materials for the lightweight cellular concrete reinforcing bars of Samples 1 to 6 were prepared. The viscosity and thixotropy of the rust preventive material of each obtained sample were measured using a viscometer VT-04K, which is a rotational viscometer manufactured by Rion Co., Ltd., and the storage stability was measured after standing for 7 days. (That is, the presence or absence of phase separation due to sedimentation) was visually confirmed for evaluation.
なお、チクソトロピー性とは、静置状態ではゲル状で流動性をもたないが、振動、撹拌、振り混ぜ等の外力を加えるとゲル状の物質が流動性を示すゾル状に変化し、これを放置しておくと再びゲル状にもどる性質を意味する。この現象は、外力によってゲルの内部構造が破壊されて流動性が増すが、静置すると粒子間の結合が再現するため起こるとされている。本実施例では、チクソトロピー性の指標としてチクソトロピーインデックス値（ＴＩ値）を採用した。すなわち、回転粘度計で測定した６ｒｐｍにおける見掛け粘度(ｍＰａ・ｓ)を６０ｒｐｍにおける見掛け粘度(ｍＰａ・ｓ)で除すことによりＴＩ値を求め、このＴＩ値が１.５以上のものをチクソトロピー性有り、１.５未満のものをチクソトロピー性無しと評価した。 The thixotropy is a gel-like substance that does not have fluidity in a stationary state, but when an external force such as vibration, stirring, or shaking is applied, the gel-like substance changes to a sol-like substance that exhibits fluidity. It means that if left unattended, it will return to a gel state again. It is said that this phenomenon occurs because the internal structure of the gel is destroyed by an external force and the fluidity is increased, but when the gel is allowed to stand, the bonds between the particles are reproduced. In this example, the thixotropy index value (TI value) was adopted as an index of thixotropy. That is, the TI value is obtained by dividing the apparent viscosity (mPa · s) at 6 rpm measured by a rotational viscometer by the apparent viscosity (mPa · s) at 60 rpm, and those having a TI value of 1.5 or more are thixotropic. Yes, those less than 1.5 were evaluated as having no thixotropy.
次に、６組の補強用鉄筋をそれぞれ上記試料１〜６の防錆材に浸漬することで防錆膜を形成した後、これら６組の補強用鉄筋がそれぞれ埋設された６枚のＡＬＣパネルを作製した。具体的には、珪石４５質量部、石灰質原料として生石灰５質量部、セメント３０質量部、繰り返し原料２０質量部を混合し、これらの固体原料合計１００質量部に水６０質量部とＡＬＣ用アルミニウム粉末及び界面活性剤を加えてから混練してスラリーを作成した。このスラリーを各補強用鉄筋が配されている型枠内に流し込み、石灰質原料の水和により半硬化させた。 Next, after forming a rust preventive film by immersing each of the six sets of reinforcing bars in the rust preventive materials of Samples 1 to 6, six ALC panels in which these six sets of reinforcing bars are embedded respectively. Was produced. Specifically, 45 parts by mass of siliceous stone, 5 parts by mass of fresh lime as a calcareous raw material, 30 parts by mass of cement, and 20 parts by mass of a repeating raw material are mixed, and 60 parts by mass of water and aluminum powder for ALC are mixed with a total of 100 parts by mass of these solid raw materials. And a surfactant was added and then kneaded to prepare a slurry. This slurry was poured into a mold in which each reinforcing bar was arranged, and was semi-cured by hydration of a calcareous raw material.
得られた半硬化体を型枠から外してオートクレーブに装入し、１８０℃、１０気圧の高温高圧水蒸気で６時間かけて養生させ、厚さ１００ｍｍのＡＬＣパネルを作製した。得られた防錆性能試験用のＡＬＣパネルに対して、ＪＩＳ環境変化法であるＪＩＳ−Ａ５４１６（軽量気泡コンクリート）に記載の防錆材の防錆性能試験に従い防錆性能を評価した。すなわち、補強鉄筋の表面積に対する発生した錆の面積により発錆率（％）を求めた。その評価結果を上記した試料１〜６の防錆材の作製時の撹拌速度並びに粘度及びチクソトロピー性と共に下記表１に示す。 The obtained semi-cured product was removed from the mold and charged into an autoclave, and cured with high-temperature high-pressure steam at 180 ° C. and 10 atm for 6 hours to prepare an ALC panel having a thickness of 100 mm. The obtained ALC panel for rust prevention performance test was evaluated for rust prevention performance according to the rust prevention performance test of the rust preventive material described in JIS-A5416 (lightweight cellular concrete), which is a JIS environmental change method. That is, the rust rate (%) was determined from the area of rust generated with respect to the surface area of the reinforcing bar. The evaluation results are shown in Table 1 below together with the stirring speed, viscosity and thixotropy of the rust preventive materials of Samples 1 to 6 described above.
上記表１より、試料１は試料３〜５と比較すると粘度が高く、またチクソトロピー性は無しと評価された。その結果、試料１は貯蔵安定性が悪く、防錆性ではＪＩＳ環境変化法の規格値５.０％以内を大幅に超える３６.７％の発錆率となった。このように安定性及び防錆性が悪くなった理由は、試料１は液体分原料及び固形分原料の混合時の撹拌速度がいずれも本発明の要件より低いため混合が不十分となり、防錆材としての基本性能が発揮されなかったためと考えられる。 From Table 1 above, it was evaluated that Sample 1 had a higher viscosity than Samples 3 to 5 and had no thixotropic property. As a result, the storage stability of Sample 1 was poor, and the rust prevention rate was 36.7%, which greatly exceeded the standard value of 5.0% of the JIS Environmental Change Law. The reason why the stability and the rust prevention property are deteriorated in this way is that the mixing speed of the sample 1 at the time of mixing the liquid component raw material and the solid content raw material is lower than the requirement of the present invention, so that the mixing becomes insufficient and the rust prevention property occurs. It is probable that the basic performance as a material was not exhibited.
試料２は粘度及びチクソトロピー性が共に試料３〜５とほぼ同程度であったが、貯蔵安定性の評価では静置後に固形原料が沈降した。このため、発錆率は上記規格値を超えて９.３％となった。一方、試料３〜５については粘度が３.６〜４.５ｄＰａ・ｓｅｃと良好であって且つチクソトロピー性は有りと評価された。その結果、貯蔵安定性が良好となり、また、発錆率も試料３が０.０％、試料４が０.２％、試料５が０.０％であり、ＪＩＳ環境変化法の規格値５.０％を大幅に下回っていた。 Sample 2 had almost the same viscosity and thixotropy as Samples 3 to 5, but the solid raw material settled after standing in the evaluation of storage stability. Therefore, the rusting rate exceeded the above standard value and became 9.3%. On the other hand, it was evaluated that the viscosities of Samples 3 to 5 were as good as 3.6 to 4.5 dPa · sec and that they had thixotropy. As a result, the storage stability is good, and the rust rate is 0.0% for sample 3, 0.2% for sample 4, and 0.0% for sample 5, which is the standard value 5 of the JIS Environmental Change Law. It was well below .0%.
試料６については液体分及び固形分の混合時の撹拌速度が試料３〜５の場合よりも速いため、良好な防錆材が作製できると予想していた。しかし、粘度が非常に高くなり、試料１の場合と同様に防錆材としての基本性能が発揮されていない状態となった。この原因について調査した結果、撹拌速度が速すぎたためせん断力が強く作用し過ぎ、エマルジョン（乳化剤）が破壊されたことが主原因と判明した。また、試料６の防錆材はチクソトロピーインデックス値が非常に高く、ブレードの摩擦熱が防錆材の温度を上昇させ、粘度上昇を引き起こしていた。加えて、エマルジョン（乳化剤）は元来熱に弱く、壊れ易い状態にあったため、液性状が著しく悪化したと考えられる。 As for sample 6, since the stirring speed at the time of mixing the liquid content and the solid content was faster than that in the case of samples 3 to 5, it was expected that a good rust preventive material could be produced. However, the viscosity became very high, and as in the case of Sample 1, the basic performance as a rust preventive material was not exhibited. As a result of investigating the cause, it was found that the main cause was that the shearing force acted too strongly because the stirring speed was too fast, and the emulsion (emulsifier) was destroyed. Further, the rust preventive material of Sample 6 had a very high thixotropy index value, and the frictional heat of the blade raised the temperature of the rust preventive material, causing an increase in viscosity. In addition, since the emulsion (emulsifier) was originally vulnerable to heat and was in a fragile state, it is considered that the liquid properties were significantly deteriorated.
以上の結果より、ＡＬＣパネルの補強用鉄筋の防錆材の原料の調合では、液体分の混合時はせん断力を有する高速撹拌機の回転数を１２０〜２００ｒｐｍの範囲内とし、固形分原料の混合時の撹拌速度は上記の液体分原料の混合時の撹拌速度よりも４０〜５０ｒｐｍ速くすることで、安定性や防錆性に優れた防錆材を製造できることが分かる。 Based on the above results, in the preparation of the raw material for the rust preventive material for the reinforcing reinforcement of the ALC panel, the rotation speed of the high-speed stirrer having a shearing force was set within the range of 120 to 200 rpm when the liquid component was mixed, and the solid content raw material was prepared. It can be seen that a rust preventive material having excellent stability and rust prevention can be produced by increasing the stirring speed at the time of mixing by 40 to 50 rpm higher than the stirring speed at the time of mixing the above-mentioned liquid component raw materials.
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