JP2003010944A - Organic composition for foaming fluid self-strengthening mold - Google Patents
Organic composition for foaming fluid self-strengthening moldInfo
- Publication number
- JP2003010944A JP2003010944A JP2001196712A JP2001196712A JP2003010944A JP 2003010944 A JP2003010944 A JP 2003010944A JP 2001196712 A JP2001196712 A JP 2001196712A JP 2001196712 A JP2001196712 A JP 2001196712A JP 2003010944 A JP2003010944 A JP 2003010944A
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- Prior art keywords
- mold
- foaming
- mass
- acid
- sand
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、発泡流動自硬性鋳
型の製造に用いる有機系の鋳型用組成物に関するもので
あり、さらに詳しくは造型時の鋳型の収縮を抑制した有
機系発泡流動自硬性鋳型用組成物に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic mold composition for use in the production of a foaming fluidized self-hardening mold, and more particularly to an organic foaming fluidized self-curing composition in which shrinkage of the mold during molding is suppressed. The present invention relates to a mold composition.
【０００２】[0002]
【従来の技術】有機系粘結剤を用いる発泡流動自硬性鋳
型は、例えば鋳物砂、酸硬化性粘結剤、酸硬化剤、界面
活性剤及び水を混合することによって、界面活性剤と水
との作用で生じた気泡の砂粒間介在によって流動状化
（発泡流動性）した自硬性鋳型用組成物（以下、発泡流
動性混合物という）とし、これを成形型内に流し込み充
填し、発泡状態を保持しつつ酸硬化剤の作用により酸硬
化性粘結剤を室温で硬化させることにより製造されるこ
とが知られている（例えば特開昭５３−９９０３３号公
報）。そして、この種の自硬性鋳型の造型法は、上記の
ように発泡流動性混合物を成形型内に流し込み充填すれ
ばよいため、他の自硬性鋳型造型法のような面倒で労力
と時間のかかる造型時のラミング作業の必要がなく必要
に応じて振動作業を行なう程度で済むなど省力化を図れ
るという利点がある。2. Description of the Related Art A foaming fluidized self-hardening mold using an organic binder is prepared by mixing a molding sand, an acid-curable binder, an acid-curing agent, a surfactant and water to form a surfactant and a water. A composition for self-hardening mold (hereinafter referred to as a foaming fluid mixture) that is fluidized (foaming fluidity) by interposing sand bubbles between bubbles generated by the action of and is poured into a molding die and filled to form a foamed state. It is known to be produced by curing an acid-curable binder at room temperature by the action of an acid curing agent while retaining the above (for example, JP-A-53-99033). And, the molding method of this kind of self-hardening mold, since it is sufficient to pour and fill the foaming fluid mixture into the molding die as described above, it is troublesome and takes time and labor like other self-hardening mold molding methods. There is an advantage that labor saving can be achieved, for example, there is no need for ramming work at the time of molding and only vibration work is required.
【０００３】しかしながら、発泡流動性混合物は、上述
したように造型作業に支障のない発泡流動性を得るた
め、一般に多量の水を用いることから酸硬化性粘結剤の
硬化反応が遅く造型に長時間を要する。このため、成形
型内の発泡流動性混合物の充填層（鋳型形成部）は砂粒
間に存在する気泡の破泡による沈降、すなわち造型時の
鋳型の収縮を生じやすく得られた鋳型は寸法精度に欠け
るという問題があった。However, since the foaming fluid mixture has foaming fluidity which does not hinder the molding operation as described above, since a large amount of water is generally used, the curing reaction of the acid-curable binder is slow and the molding is long. It takes time. Therefore, the packed bed (mold forming part) of the foaming fluid mixture in the molding die is liable to cause settling due to the breakage of bubbles existing between the sand grains, that is, the mold shrinks during molding, and the obtained mold has dimensional accuracy. There was a problem of chipping.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、造型に支障
のない発泡流動性を有し、かつ造型時の鋳型の収縮（以
下、鋳型の収縮ともいう）を抑制できる有機系発泡流動
自硬性鋳型用組成物を提供することを目的になされたも
のである。DISCLOSURE OF THE INVENTION The present invention has an organic foaming flow self-curing property which has a foaming fluidity which does not hinder the molding and which can suppress the contraction of the mold during molding (hereinafter, also referred to as the contraction of the mold). It is intended to provide a mold composition.
【０００５】[0005]
【課題を解決するための手段】本発明者は、前記課題を
解決すべく鋭意検討を行った結果、化学反応により二酸
化炭素を発生する化合物を用いることにより、造型に支
障のない発泡流動性を有し、かつ鋳型の収縮を抑制でき
ることを見出し、本発明を完成するに至った。Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventor has found that by using a compound that generates carbon dioxide by a chemical reaction, foaming fluidity that does not interfere with molding can be obtained. The present invention has been completed, and has been found to have the above properties and to suppress the shrinkage of the mold.
【０００６】すなわち、本発明は（Ａ）鋳物砂、（Ｂ）
酸硬化性粘結剤、（Ｃ）酸硬化剤、（Ｄ）界面活性剤、
（Ｅ）水及び（Ｆ）化学反応により二酸化炭素を発生す
る化合物を含有して成ることを特徴とする有機系発泡流
動自硬性鋳型用組成物である。また他の本発明は、これ
らの成分（Ａ〜Ｆ）と（Ｇ）増粘剤とを含有して成るこ
とを特徴とする有機系発泡流動自硬性用鋳型用組成物で
ある。That is, the present invention is (A) foundry sand, (B)
Acid-curable binder, (C) acid-curing agent, (D) surfactant,
An organic foaming fluidized self-hardening mold composition comprising (E) water and (F) a compound that generates carbon dioxide by a chemical reaction. Still another aspect of the present invention is an organic foaming fluidized self-hardening mold composition comprising these components (A to F) and (G) a thickener.
【０００７】[0007]
【発明の実施の形態】本発明において用いられる（Ａ）
鋳物砂としては、特に制限はなく、例えばケイ砂のほ
か、オリビンサンド、ジルコンサンド、クロマイトサン
ド、アルミナサンド等の特殊砂、フェロクロム系のスラ
グ、フェロニッケル系スラグ、転炉スラグ等のスラグ系
粒子、ナイガイセラビーズ（商品名）のような多孔質粒
子及びこれらの鋳物砂を用いた使用済み鋳型の回収砂及
び／又は再生砂などが挙げられる。これらは単独で用い
てもよく、また２種以上を組合わせて用いてもよい。中
でも、使用済み酸硬化性鋳型の回収砂及び／又は再生砂
を用いる場合は、硬化が速くなるため、鋳型の収縮を一
層効果的に抑制することができるので、好ましく用いら
れる。BEST MODE FOR CARRYING OUT THE INVENTION (A) Used in the Present Invention
The casting sand is not particularly limited, for example, in addition to silica sand, olivine sand, zircon sand, chromite sand, special sand such as alumina sand, ferrochrome slag, ferronickel slag, slag particles such as converter slag. , Porous particles such as nigai cera beads (trade name), and recovered sand and / or reclaimed sand of used molds using these molding sands. These may be used alone or in combination of two or more. Above all, when the recovered sand and / or the reclaimed sand of the used acid-curable mold is used, the curing is accelerated, and the shrinkage of the mold can be suppressed more effectively, and therefore, it is preferably used.
【０００８】（Ｂ）酸硬化性粘結剤は、後記する酸硬化
剤の作用により室温で硬化反応を発現する有機系粘結剤
であり、このような酸硬化性粘結剤としては、例えばフ
ェノール系レゾール樹脂、フェノールフラン系樹脂、フ
ラン系樹脂、尿素フラン系樹脂及び尿素系樹脂などが挙
げられるがこれらに限定されるものではない。勿論、こ
れらは２種以上を組合わせて用いてもよい。また、鋳型
強度を向上させる目的でシランカップリング剤を加えて
も差し支えない。好ましいシランカップリング剤として
は、γ−アミノプロピルトリエトキシシラン、γ−（２
−アミノエチル）アミノプロピルトリメトキシシラン、
γ−グリシドキシプロピルトリメトキシシラン等が挙げ
られるが特に限定されるものではない。The (B) acid-curable binder is an organic binder that exhibits a curing reaction at room temperature due to the action of the acid-curable agent described later. Examples of such an acid-curable binder include: Examples thereof include, but are not limited to, phenol-based resole resins, phenol-furan-based resins, furan-based resins, urea-furan-based resins and urea-based resins. Of course, these may be used in combination of two or more kinds. Further, a silane coupling agent may be added for the purpose of improving the mold strength. Preferred silane coupling agents include γ-aminopropyltriethoxysilane and γ- (2
-Aminoethyl) aminopropyltrimethoxysilane,
Examples thereof include γ-glycidoxypropyltrimethoxysilane, but are not particularly limited.
【０００９】これらの酸硬化性粘結剤は、フェノール類
（例えばフェノール、アルキルフェノール、多価フェノ
ール、ビスフェノール及びこれらの組み合わせなど）、
フルフリルアルコール、フルフラール、尿素等をそれぞ
れ単独に、或いはこれらを組み合わせたものとホルムア
ルデヒドとを反応触媒の存在下に反応させて得られる初
期縮合物である。また、これらの初期縮合物は、粘度の
低下（発泡流動性混合物の流動性の向上）、低臭気化
（尿素やメラミンを遊離の状態で添加混合して未反応ホ
ルムアルデヒドの捕捉）など目的に応じてフルフリルア
ルコール、フルフラール、尿素、メチロール尿素、メラ
ミン、メチロールメラミンなどで変性してもよい。酸硬
化性粘結剤の配合量は、鋳物砂１００質量部に対して
０．５〜５．０質量部である。配合量が０．５質量部未
満であると鋳型強度が低くて実用性に欠け、又逆に５．
０質量部を超えると鋳造時のガス発生量が多くなるため
鋳物欠陥が生じやすくなる。These acid-curable binders include phenols (for example, phenol, alkylphenol, polyhydric phenol, bisphenol and combinations thereof),
It is an initial condensate obtained by reacting furfuryl alcohol, furfural, urea or the like individually or in combination thereof with formaldehyde in the presence of a reaction catalyst. In addition, these initial condensates are used depending on the purpose such as reduction of viscosity (improvement of fluidity of foaming fluid mixture), low odorization (addition and mixing of urea and melamine in a free state to capture unreacted formaldehyde). It may be modified with furfuryl alcohol, furfural, urea, methylol urea, melamine, and methylol melamine. The compounding amount of the acid-curable binder is 0.5 to 5.0 parts by mass with respect to 100 parts by mass of molding sand. If the blending amount is less than 0.5 parts by mass, the mold strength is low and it is not practical, and conversely 5.
If the amount exceeds 0 parts by mass, the amount of gas generated during casting increases and casting defects are likely to occur.
【００１０】（Ｃ）酸性硬化剤としては、（Ｂ）酸硬化
性粘結剤の室温での硬化を促進させる酸性化合物であれ
ば特に限定されないが、具体的な例としては、例えばリ
ン酸、ピロリン酸、硫酸、硫酸エステル、ｐ−トルエン
スルホン酸、ベンゼンスルホン酸、フェノールスルホン
酸、キシレンスルホン酸、アルキルベンゼンスルホン
酸、アルキルスルホン酸などが挙げられる。これらは単
独で用いてもよく、また２種以上を組合わせて用いても
よい。また、これらの酸性硬化剤は、発泡流動性混合物
中の気泡の安定性、発泡流動性の向上の観点から、一般
に２０〜９０質量％の水溶液として用いられる。酸性硬
化剤の配合量は、鋳物砂１００質量部に対して有効成分
量で０．１〜５．０質量部である。配合量が０．１質量
部未満であると硬化が遅くなり、又逆に５．０質量部を
超えると硬化が速いため造型作業が困難になる。The acidic curing agent (C) is not particularly limited as long as it is an acidic compound that accelerates the curing of the acid curing binder (B) at room temperature, and specific examples thereof include phosphoric acid and Pyrophosphoric acid, sulfuric acid, sulfuric acid ester, p-toluenesulfonic acid, benzenesulfonic acid, phenolsulfonic acid, xylenesulfonic acid, alkylbenzenesulfonic acid, alkylsulfonic acid and the like can be mentioned. These may be used alone or in combination of two or more. Further, these acidic curing agents are generally used as an aqueous solution of 20 to 90% by mass from the viewpoint of improving the stability of bubbles in the foaming fluid mixture and the foaming fluidity. The compounding amount of the acidic curing agent is 0.1 to 5.0 parts by mass as an effective component amount with respect to 100 parts by mass of molding sand. If the compounding amount is less than 0.1 parts by mass, the curing will be slow, and conversely, if it exceeds 5.0 parts by mass, the curing will be fast and the molding operation will be difficult.
【００１１】（Ｄ）界面活性剤は、水との相互作用によ
り鋳物砂に発泡流動性を付与する作用を果たすものであ
り、特に気泡の発生を図る起泡作用と気泡の安定化を図
る整泡及び泡安定作用を有する界面活性化合物が好適で
ある。このような界面活性剤としては、例えばアニオン
系界面活性剤及びノニオン系界面活性剤が挙げられる
が、これらに限定されるものではなく、このような界面
活性作用を有する化合物、例えばドデシルベンゼンスル
ホン酸のようなアルキルベンゼンスルホン酸でもよい。The surfactant (D) has a function of imparting foaming fluidity to the foundry sand by interaction with water. Particularly, it has a foaming function for generating bubbles and a stabilizing function for stabilizing bubbles. Surface-active compounds having foam and foam-stabilizing action are preferred. Examples of such surfactants include, but are not limited to, anionic surfactants and nonionic surfactants, and compounds having such a surfactant action, such as dodecylbenzene sulfonic acid, are not limited thereto. Alkylbenzene sulfonic acid such as
【００１２】前記アニオン系界面活性剤としては、例え
ば脂肪酸ナトリウム等の脂肪酸塩、硫酸ドデシルナトリ
ウム等の硫酸アルキル塩、硫酸アルキルポリオキシエチ
レン塩、硫酸エステル塩、アルキルベンゼンスルホン酸
塩、モノアルキル燐酸塩等の燐酸エステル塩などが挙げ
られる。また、ノニオン系界面活性剤としては、例えば
ポリオキシエチレンアルキルエーテル、ポリオキシエチ
レンアルキルフェニルエーテル、ヒマシ油エチレンオキ
シド付加物、ポリオキシエチレン脂肪酸エステル、ソル
ビタン脂肪酸エステル、ポリオキシエチレンソルビタン
脂肪酸エステル、脂肪酸ジエタノールアミド、ショ糖脂
肪酸エステルなどが挙げられるがこれらに限定されるも
のではない。勿論、これらは２種以上組み合わせて用い
てもよい。界面活性剤の配合量は、鋳物砂１００質量部
に対して０．０１〜５質量部である。０．０１質量部未
満であると発泡安定性が悪くなり、逆に５質量部を超え
ると鋳型強度が低くなる傾向がある。Examples of the anionic surfactants include fatty acid salts such as sodium fatty acid, alkyl sulfates such as sodium dodecyl sulfate, alkyl polyoxyethylene sulfates, sulfate ester salts, alkylbenzene sulfonates, monoalkyl phosphates and the like. And the like. Examples of nonionic surfactants include polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether, castor oil ethylene oxide adduct, polyoxyethylene fatty acid ester, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, fatty acid diethanolamide. , Sucrose fatty acid ester and the like, but not limited thereto. Of course, these may be used in combination of two or more kinds. The blending amount of the surfactant is 0.01 to 5 parts by mass with respect to 100 parts by mass of the molding sand. If it is less than 0.01 parts by mass, foaming stability tends to be poor, and conversely if it exceeds 5 parts by mass, the mold strength tends to be low.
【００１３】（Ｅ）水は、界面活性剤との作用により気
泡の発生を促すとともに安定化を図る一方、発泡流動性
混合物の流動性を助長するものであり、水の配合量とし
ては発泡流動性混合物の所望の発泡流動性を新たな水の
添加により適宜調整すればよいが、一般的には鋳物砂１
００質量部に対して総水分量として０．１〜５．０質量
部、より好ましくは１．０〜３．０質量部である。０．
１質量部未満であると発泡安定性が悪くなり、また逆に
５．０質量部を超えると著しく硬化が遅くなる傾向があ
る。(E) Water promotes the generation of bubbles and stabilizes them by the action of a surfactant, while promoting the fluidity of the foaming fluid mixture. The desired foaming fluidity of the water-soluble mixture may be appropriately adjusted by adding new water. Generally, the molding sand 1
The total water content is 0.1 to 5.0 parts by mass, more preferably 1.0 to 3.0 parts by mass, relative to 00 parts by mass. 0.
If it is less than 1 part by mass, foaming stability tends to be poor, and conversely if it exceeds 5.0 parts by mass, curing tends to be significantly delayed.
【００１４】（Ｆ）化学反応によって二酸化炭素を発生
する化合物は、発泡流動性混合物の経時的破泡による鋳
型の収縮を抑制するために二酸化炭素を化学反応により
発生させる化合物（以下、二酸化炭素発生化合物とい
う）であり、このような性質を有する化合物としては、
例えば水のほかカルボン酸や過酸化水素などとも反応し
二酸化炭素を発生するイソシアネート化合物、酸硬化剤
と中和反応して二酸化炭素を発生する炭酸塩、酸硬化剤
及び水の存在下に加水分解作用を受けて二酸化炭素を発
生する炭酸エステルなどが挙げられるがこれらに限定さ
れるものではない。中でも、二酸化炭素の発生が穏やか
なイソシアネート化合物が好ましい。勿論、これらを併
用しても差し支えない。このような二酸化炭素発生化合
物の配合量は、鋳物砂１００質量部に対して０．０１〜
１０質量部、好ましくは０．０５〜１質量部である。配
合量が０．０１質量部未満では発生する二酸化炭素量が
少ないため鋳型の収縮を抑制できず、逆に１０質量部を
超えると発生する二酸化炭素量が多くなり鋳型が必要以
上に膨張する傾向がある。The compound (F) which generates carbon dioxide by a chemical reaction is a compound which generates carbon dioxide by a chemical reaction in order to suppress the contraction of the mold due to the time-dependent foam breaking of the foaming fluid mixture (hereinafter, carbon dioxide generation. A compound), and as a compound having such a property,
For example, an isocyanate compound that reacts with carboxylic acid or hydrogen peroxide in addition to water to generate carbon dioxide, a carbonate that neutralizes with an acid curing agent to generate carbon dioxide, an acid curing agent and hydrolysis in the presence of water Examples thereof include carbonic acid esters that generate carbon dioxide upon receiving the action, but are not limited thereto. Of these, isocyanate compounds that generate mild carbon dioxide are preferable. Of course, these may be used together. The compounding amount of such a carbon dioxide generating compound is 0.01 to 100 parts by mass of molding sand.
It is 10 parts by mass, preferably 0.05 to 1 part by mass. If the blending amount is less than 0.01 parts by mass, the amount of carbon dioxide generated is too small to suppress the contraction of the mold. Conversely, if it exceeds 10 parts by mass, the amount of carbon dioxide generated is large and the mold tends to expand more than necessary. There is.
【００１５】前記イソシアネート化合物は、分子中にイ
ソシアネート基を有する化合物であり、その種類につい
ては特に限定なく、例えばモノイソシアネート、ポリイ
ソシアネート、プレポリマーなどを任意に用いることが
できる。このようなイソシアネート化合物としては、例
えばジフェニルメタンジイソシアネート、ポリメチレン
ポリフェニレンポリイソシアネート（以下、クルードＭ
ＤＩという）等の芳香族イソシアネート、ヘキサメチレ
ンジイソシアネート等の脂肪族イソシアネート、４，
４’−ジシクロヘキシルメタンジイソシアネート等の脂
環式イソシアネートなどが挙げられる。また、炭酸塩と
しては、例えば炭酸ナトリウム、炭酸水素ナトリウム、
炭酸カルシウム、炭酸バリウムなどが挙げられる。ま
た、炭酸エステルとしては、例えばジメチルカーボネー
ト、プロピレンカーボネート、エチレンカーボネートな
どが挙げられる。The above-mentioned isocyanate compound is a compound having an isocyanate group in the molecule, and the kind thereof is not particularly limited, and for example, monoisocyanate, polyisocyanate, prepolymer and the like can be arbitrarily used. Examples of such an isocyanate compound include diphenylmethane diisocyanate and polymethylene polyphenylene polyisocyanate (hereinafter, referred to as Crude M).
Aromatic isocyanate such as DI), aliphatic isocyanate such as hexamethylene diisocyanate, 4,
Examples thereof include alicyclic isocyanate such as 4′-dicyclohexylmethane diisocyanate. Examples of the carbonate include sodium carbonate, sodium hydrogen carbonate,
Examples thereof include calcium carbonate and barium carbonate. Further, examples of the carbonic acid ester include dimethyl carbonate, propylene carbonate, ethylene carbonate and the like.
【００１６】（Ｇ）増粘剤は、界面活性剤と水の相互作
用により生じた気泡の安定化（破泡の抑制）を気泡膜の
増粘化で対応することによって、良好な発泡流動性の保
持と鋳型の収縮抑制を図る化合物であり、このような増
粘剤としては、例えばポリビニルアルコール、ポリビニ
ルブチラール、ポリビニルエーテル等のポリビニル系化
合物、カルボキシメチルセルロース、ヒドロキシエチル
セルロース、ヒドロキシプロピルセルロース等のセルロ
ース系化合物、ポリアクリルアミド等のアクリルアミド
系ポリマーなどが挙げられる。中でも、ポリビニル系化
合物、特にポリビニルアルコールが好ましい。勿論、こ
れらは２種以上を組み合わせて用いてもよい。これらの
増粘剤は、気泡の安定化、発泡流動性の向上の観点か
ら、好ましくは０．１〜５０質量％の水溶液として用い
られるが、通常、これらは酸硬化性粘結剤に内添される
か、又は混練時に添加される。増粘剤の配合量は、鋳物
砂１００質量部に対して有効成分量で０．０００１〜
０．１質量部、好ましくは０．００１〜０．０５質量部
である。配合量が０．０００１質量部未満では気泡の安
定化が図れず、逆に０．１質量部を超えると発泡流動性
が低下する傾向が認められる。The thickening agent (G) has a good foaming fluidity by stabilizing the bubbles (suppressing bubble breakage) generated by the interaction between the surfactant and water by thickening the bubble film. Is a compound that aims to retain and suppress the shrinkage of the template, as such a thickener, for example, polyvinyl alcohol, polyvinyl butyral, polyvinyl compounds such as polyvinyl ether, carboxymethyl cellulose, hydroxyethyl cellulose, cellulose such as hydroxypropyl cellulose. Examples thereof include compounds and acrylamide polymers such as polyacrylamide. Of these, polyvinyl compounds, particularly polyvinyl alcohol, are preferable. Of course, these may be used in combination of two or more. These thickeners are preferably used as an aqueous solution of 0.1 to 50 mass% from the viewpoint of stabilizing bubbles and improving foaming fluidity, but usually, these are internally added to the acid-curable binder. Or added during kneading. The compounding amount of the thickener is 0.0001 to 100 parts by mass of the molding sand as an effective component amount.
It is 0.1 part by mass, preferably 0.001 to 0.05 part by mass. If the blending amount is less than 0.0001 parts by mass, bubbles cannot be stabilized, and conversely, if it exceeds 0.1 parts by mass, the foaming fluidity tends to decrease.
【００１７】本発明の発泡流動性混合物は、一般にミキ
サー内に（Ａ）鋳物砂、（Ｃ）酸性硬化剤、（Ｄ）界面
活性剤及び（Ｅ）水を投入して混練し、次いで（Ｂ）酸
硬化性粘結剤及び（Ｇ）増粘剤を投入して混練し、最後
に（Ｆ）二酸化炭素発生化合物を投入し混練して製造さ
れるが、これに限定されるものではなく、必要に応じて
（Ｂ）、（Ｃ）、（Ｆ）等の添加順序を変更したり、
（Ｂ＋Ｄ）、（Ｂ＋Ｇ）、（Ｄ＋Ｅ）等の混合物として
用いても構わない。なお、製造（混練）に要する時間
は、ミキサーの種類、配合基準、鋳物砂の種類等により
変動するため一概にさだめられないが一般的には２０〜
１８０秒程度である。The foaming fluid mixture of the present invention is generally kneaded by adding (A) foundry sand, (C) acid hardening agent, (D) surfactant and (E) water into a mixer, and then kneading (B). ) An acid-curable binder and (G) a thickener are added and kneaded, and finally (F) a carbon dioxide-generating compound is added and kneaded, but not limited to this. If necessary, change the addition order of (B), (C), (F), etc.,
It may be used as a mixture of (B + D), (B + G), (D + E) and the like. The time required for production (kneading) varies depending on the type of mixer, the mixing standard, the type of molding sand, etc., but cannot be generally determined, but generally 20 to
It is about 180 seconds.
【００１８】[0018]
【実施例】次に、本発明を実施例によりさらに詳細に説
明するが、本発明は、これらの例によってなんら限定さ
れるものではない。なお、発泡流動性混合物については
下記の試験を行なった。
（１）発泡流動性混合物の発泡流動性（スランプ率
％）：コーン型（上端口径５８mm、下端口径８６mm、高
さ１４０mm）の上端口より発泡流動性混合物を流し込ん
で余剰の砂を掻き取り、直ちにコーン型を垂直に引き上
げた際に形成される発泡流動性混合物形状の硬化体（２
４時間後）の頂部から底面までの高さｈ（mm）を測定し
て下記式によりスランプ率を算出する。なお、スランプ
率が大きいほど発泡流動性混合物の流動性が良いことを
意味する。
スランプ率（％）＝｛（１４０−ｈ）／１４０｝×１０
０
（２）造型時の鋳型の収縮量：ポリ塩化ビニル製パイプ
型（内径１００mm、高さ１０００mm）内に発泡流動性混
合物を上部より流し込んで余剰の砂を掻き取り、直ちに
鉄板で掻き取り面を塞ぎ、そのまま温度２５℃、相対湿
度６０％の雰囲気で２４時間放置し、鉄板を取り除いて
ポリ塩化ビニル製パイプ型の上端から鋳型上面までの距
離をノギスで測定して鋳型の収縮量（mm）とした。な
お、その数値が小さいほど気泡の安定性が良いともいえ
る。EXAMPLES Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. The following tests were conducted on the foaming fluid mixture. (1) Foaming fluidity (slump ratio%) of foaming fluidity mixture: Pour the foaming fluidity mixture through the top end of a cone type (upper end diameter 58 mm, lower end diameter 86 mm, height 140 mm) to scrape off excess sand, Immediately after pulling up the cone mold vertically, a foamed fluid mixture-shaped cured body (2
After 4 hours, the height h (mm) from the top to the bottom is measured and the slump rate is calculated by the following formula. The larger the slump rate, the better the fluidity of the foaming fluid mixture. Slump rate (%) = {(140-h) / 140} × 10
0 (2) Shrinkage of mold during molding: A foaming fluid mixture is poured from the top into a polyvinyl chloride pipe mold (inner diameter 100 mm, height 1000 mm) to scrape off excess sand and immediately scrape it off with an iron plate. And leave it for 24 hours in an atmosphere with a temperature of 25 ° C and a relative humidity of 60%, remove the iron plate, measure the distance from the upper end of the polyvinyl chloride pipe mold to the upper surface of the mold with a caliper, and shrink the mold (mm ). It can be said that the smaller the value, the better the stability of the bubbles.
【００１９】実施例１
遠州鉄工（株）製スピードミキサー内に鋳物砂としてケ
イ砂１４kg、酸硬化剤としてキシレンスルホン酸の７０
質量％水溶液１５４ｇ（０．８質量％／ケイ砂）、界面
活性剤としてアニオン系界面活性剤２８ｇ（０．２質量
％／ケイ砂）及び水８４ｇを投入して混練し、次に酸硬
化性粘結剤としてフェノール系レゾール樹脂（商品名：
ＡＶライトＨＰ３０００Ａ、旭有機材工業株式会社製）
１４０ｇ（１質量％／ケイ砂）を投入して混練し、最後
に二酸化炭素発生化合物としてクルードＭＤＩ（商品
名：コスモネートＭ２００、三井化学株式会社製）１４
ｇ（０．１質量％／ケイ砂）を投入後混練して発泡流動
性混合物を得た。その所要時間は２分であった。また、
発泡流動性混合物中の総水分量は鋳物砂に対して約１．
３質量％であった。得られた発泡流動性混合物は、直ち
に冒頭記載の試験法により発泡流動性（スランプ率）と
鋳型の収縮量を測定した。それらの結果を表１に示す。Example 1 In a speed mixer manufactured by Enshu Iron Works Co., Ltd., 14 kg of silica sand was used as casting sand, and 70 g of xylene sulfonic acid was used as an acid curing agent.
154 g of a mass% aqueous solution (0.8 mass% / silica sand), 28 g of an anionic surfactant as a surfactant (0.2 mass% / silica sand) and 84 g of water are added and kneaded, and then acid-curable Phenolic resole resin as a binder (trade name:
AV Lite HP3000A, manufactured by Asahi Organic Materials Co., Ltd.)
140 g (1% by mass / silica sand) was added and kneaded, and finally, as a carbon dioxide generating compound, crude MDI (trade name: Cosmonate M200, manufactured by Mitsui Chemicals, Inc.) 14
After adding g (0.1% by mass / silica sand), the mixture was kneaded to obtain a foaming fluid mixture. The time required was 2 minutes. Also,
The total water content in the foamable mixture is about 1.
It was 3% by mass. The foaming fluid mixture thus obtained was immediately measured for foaming fluidity (slump rate) and mold shrinkage by the test method described at the beginning. The results are shown in Table 1.
【００２０】実施例２〜３
実施例１において、酸硬化性粘結剤とともに、さらに増
粘剤として（１）ポリビニールアルコールの２０質量％
水溶液を１４ｇ（０．０２質量％／ケイ砂）又は（２）
ヒドロキシエチルセルロースの３質量％水溶液を１４ｇ
（０．００３質量％／ケイ砂）をそれぞれ個別に用いた
以外は、実施例１と同様にして２種類の発泡流動性混合
物（ケイ砂に対する総水分量は実施例２で約１．３質量
％、実施例３で約１．４質量％）を得た。得られた発泡
流動性混合物については、それぞれの発泡流動性（スラ
ンプ率）と鋳型の収縮量を測定した。それらの結果を表
１に示す。Examples 2 to 3 In Example 1, together with the acid-curable binder, (1) 20% by mass of polyvinyl alcohol was used as a thickener.
14 g of aqueous solution (0.02 mass% / silica sand) or (2)
14 g of 3 mass% aqueous solution of hydroxyethyl cellulose
Two kinds of foaming fluidized mixture (total water content with respect to silica sand is about 1.3 mass in Example 2) in the same manner as in Example 1 except that (0.003 mass% / silica sand) is used individually. %, About 1.4% by mass in Example 3). With respect to the obtained foaming fluid mixture, the foaming fluidity (slump rate) and the shrinkage amount of the mold were measured. The results are shown in Table 1.
【００２１】実施例４
実施例１において、１４ｇのクルードＭＤＩに代えて炭
酸水素ナトリウムを２８ｇ使用し、かつ増粘剤としてポ
リビニールアルコールの２０質量％水溶液を１４ｇ用い
た以外は、実施例１と同様にして発泡流動性混合物（ケ
イ砂に対する総水分量は約１．３質量％）を得た。得ら
れた発泡流動性混合物については、発泡流動性（スラン
プ率）と鋳型の収縮量を測定した。それらの結果を表１
に示す。Example 4 Example 1 was repeated except that 28 g of sodium hydrogen carbonate was used in place of 14 g of crude MDI and 14 g of a 20 mass% aqueous solution of polyvinyl alcohol was used as a thickener. In the same manner, a foaming fluid mixture (total water content with respect to silica sand was about 1.3% by mass) was obtained. With respect to the obtained foaming fluid mixture, the foaming fluidity (slump rate) and the shrinkage amount of the mold were measured. The results are shown in Table 1.
Shown in.
【００２２】実施例５
実施例１において、ケイ砂に代えて酸硬化性鋳型の再生
砂を使用し、かつ増粘剤としてヒドロキシエチルセルロ
ースの３質量％水溶液を１４ｇ用いた以外は、実施例１
と同様にして発泡流動性混合物（ケイ砂に対する総水分
量は約１．４質量％）を得た。得られた発泡流動性混合
物については、発泡流動性（スランプ率）と鋳型の収縮
量を測定した。それらの結果を表１に示す。Example 5 Example 1 was repeated except that regenerated sand of an acid-curable mold was used in place of silica sand and 14 g of a 3% by mass aqueous solution of hydroxyethyl cellulose was used as a thickener.
A foaming fluid mixture (total water content with respect to silica sand was about 1.4% by mass) was obtained in the same manner as in. With respect to the obtained foaming fluid mixture, the foaming fluidity (slump rate) and the shrinkage amount of the mold were measured. The results are shown in Table 1.
【００２３】実施例６
実施例１において、フェノール系レゾール樹脂に代えて
尿素フラン系樹脂（商品名：ＡＶライトＨＰ６２００
Ｎ、旭有機材工業株式会社製）を使用し、かつ水８４ｇ
を７０ｇに変更した以外は、実施例１と同様にして発泡
流動性混合物（ケイ砂に対する総水分量は約１．２質量
％）を得た。得られた発泡流動性混合物については、発
泡流動性（スランプ率）と鋳型の収縮量を測定した。そ
れらの結果を表１に示す。Example 6 In Example 1, a urea furan resin (trade name: AV Light HP6200) was used instead of the phenolic resole resin.
N, manufactured by Asahi Organic Materials Co., Ltd.) and water 84g
Was obtained in the same manner as in Example 1 except that the amount was changed to 70 g, to obtain a foaming fluid mixture (total water content with respect to silica sand was about 1.2% by mass). With respect to the obtained foaming fluid mixture, the foaming fluidity (slump rate) and the shrinkage amount of the mold were measured. The results are shown in Table 1.
【００２４】比較例１
実施例１において、クルードＭＤＩを使用しない以外
は、実施例１と同様にして発泡流動性混合物を得た。得
られた発泡流動性混合物（ケイ砂に対する総水分量は約
１．３質量％）については、発泡流動性（スランプ率）
と鋳型の収縮量を測定した。それらの結果を表１に示
す。Comparative Example 1 A foamed flowable mixture was obtained in the same manner as in Example 1 except that crude MDI was not used. The foaming fluidity (slump rate) of the obtained foaming fluid mixture (total water content relative to silica sand is about 1.3% by mass)
And the shrinkage of the mold was measured. The results are shown in Table 1.
【００２５】比較例２
実施例１において、クルードＭＤＩを使用せず、かつ水
８４ｇを４２ｇに変更した以外は、実施例１と同様にし
て発泡流動性混合物（ケイ砂に対する総水分量は約１．
０質量％）を得た。得られた発泡流動性混合物について
は、発泡流動性（スランプ率）と鋳型の収縮量を測定し
た。それらの結果を表１に示す。Comparative Example 2 A foamed flowable mixture (total water content with respect to silica sand of about 1 was used in the same manner as in Example 1 except that crude MDI was not used and 84 g of water was changed to 42 g. ．
0 mass%) was obtained. With respect to the obtained foaming fluid mixture, the foaming fluidity (slump rate) and the shrinkage amount of the mold were measured. The results are shown in Table 1.
【表１】 [Table 1]
【００２６】[0026]
【発明の効果】本発明に係る有機系発泡流動自硬性鋳型
用組成物（発泡流動性混合物）は、化学反応により二酸
化炭素を発生する化合物を用いるため、発泡流動性を損
なうことなく造型時の鋳型の収縮を抑制することができ
る。さらに増粘剤を用いることにより、造型時の鋳型の
収縮を一層効果的に抑制することができる。勿論、発泡
流動性を損なうこともない。また、造型時の鋳型の収縮
は、使用済み酸硬化性鋳型の再生砂を用いることによ
り、一層効果的に抑制できることが確認された。EFFECTS OF THE INVENTION The organic foaming fluidized self-hardening mold composition (foaming fluidity mixture) according to the present invention uses a compound that generates carbon dioxide by a chemical reaction, so that it does not impair foaming fluidity during molding. The contraction of the mold can be suppressed. Furthermore, by using a thickener, it is possible to more effectively suppress the shrinkage of the mold during molding. Of course, the foaming fluidity is not impaired. It was also confirmed that the shrinkage of the mold during molding can be suppressed more effectively by using the recycled sand of the used acid-curable mold.
Claims (3)
（Ｃ）酸硬化剤、（Ｄ）界面活性剤、（Ｅ）水及び
（Ｆ）化学反応により二酸化炭素を発生する化合物を含
有して成ることを特徴とする有機系発泡流動自硬性鋳型
用組成物。1. (A) Foundry sand, (B) Acid-curable binder,
(C) Acid curing agent, (D) Surfactant, (E) Water and (F) Composition for organic foaming fluidized self-hardening mold comprising a compound that generates carbon dioxide by a chemical reaction object.
含有して成ることを特徴とする有機系発泡流動自硬性用
鋳型用組成物。2. The composition for a mold for organic foaming fluidized self-hardening according to claim 1, further comprising (G) a thickener.
回収砂及び／又は再生砂である請求項１又は２に記載の
有機系発泡流動自硬性鋳型用組成物。3. The composition for organic foaming fluidized self-hardening mold according to claim 1, wherein the (A) casting sand is recovered sand and / or reclaimed sand of a used acid-curable mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001196712A JP2003010944A (en) | 2001-06-28 | 2001-06-28 | Organic composition for foaming fluid self-strengthening mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001196712A JP2003010944A (en) | 2001-06-28 | 2001-06-28 | Organic composition for foaming fluid self-strengthening mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003010944A true JP2003010944A (en) | 2003-01-15 |
Family
ID=19034467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001196712A Pending JP2003010944A (en) | 2001-06-28 | 2001-06-28 | Organic composition for foaming fluid self-strengthening mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003010944A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009040896A (en) * | 2007-08-09 | 2009-02-26 | Kao Corp | Curing agent composition for alkali phenol resin |
| WO2014077203A1 (en) * | 2012-11-19 | 2014-05-22 | 新東工業株式会社 | Sand for casting mold, manufacturing method for sand casting-mold, and core for metal casting |
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|---|---|---|---|---|
| JPS5399033A (en) * | 1977-02-10 | 1978-08-30 | Hitachi Metals Ltd | Preparation of organic foaming self hardening mold |
| JPS53128526A (en) * | 1977-04-16 | 1978-11-09 | Asahi Organic Chem Ind | Resin component for self hardening mold |
| JPS577346A (en) * | 1980-06-12 | 1982-01-14 | Mitsui Toatsu Chem Inc | Binder composition for mold |
| JPS58212833A (en) * | 1982-06-04 | 1983-12-10 | Toshiba Mach Co Ltd | Organic self-curing sand for producing casting mold |
| JPS61249643A (en) * | 1985-04-30 | 1986-11-06 | Asahi Organic Chem Ind Co Ltd | Composition for casting mold having good collapsing property |
| JPH02280940A (en) * | 1989-04-18 | 1990-11-16 | Kao Corp | Organic foaming fluid self-hardening mold composition |
| JPH04105747A (en) * | 1990-08-23 | 1992-04-07 | Kao Corp | Additive for forming sand mold for casting and manufacture of sand mold for casting |
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|---|---|---|---|---|
| JPS5399033A (en) * | 1977-02-10 | 1978-08-30 | Hitachi Metals Ltd | Preparation of organic foaming self hardening mold |
| JPS53128526A (en) * | 1977-04-16 | 1978-11-09 | Asahi Organic Chem Ind | Resin component for self hardening mold |
| JPS577346A (en) * | 1980-06-12 | 1982-01-14 | Mitsui Toatsu Chem Inc | Binder composition for mold |
| JPS58212833A (en) * | 1982-06-04 | 1983-12-10 | Toshiba Mach Co Ltd | Organic self-curing sand for producing casting mold |
| JPS61249643A (en) * | 1985-04-30 | 1986-11-06 | Asahi Organic Chem Ind Co Ltd | Composition for casting mold having good collapsing property |
| JPH02280940A (en) * | 1989-04-18 | 1990-11-16 | Kao Corp | Organic foaming fluid self-hardening mold composition |
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|---|---|---|---|---|
| JP2009040896A (en) * | 2007-08-09 | 2009-02-26 | Kao Corp | Curing agent composition for alkali phenol resin |
| WO2014077203A1 (en) * | 2012-11-19 | 2014-05-22 | 新東工業株式会社 | Sand for casting mold, manufacturing method for sand casting-mold, and core for metal casting |
| CN104812509A (en) * | 2012-11-19 | 2015-07-29 | 新东工业株式会社 | Sand for casting mold, manufacturing method for sand casting-mold, and core for metal casting |
| JP5972393B2 (en) * | 2012-11-19 | 2016-08-17 | 新東工業株式会社 | Mold sand and molding method of sand mold |
| US9789533B2 (en) | 2012-11-19 | 2017-10-17 | Sintokogio, Ltd. | Sand for casting mold, manufacturing method for sand casting-mold, and core for metal casting |
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