JP3801788B2 - Casting composition - Google Patents
Casting composition Download PDFInfo
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- JP3801788B2 JP3801788B2 JP23050398A JP23050398A JP3801788B2 JP 3801788 B2 JP3801788 B2 JP 3801788B2 JP 23050398 A JP23050398 A JP 23050398A JP 23050398 A JP23050398 A JP 23050398A JP 3801788 B2 JP3801788 B2 JP 3801788B2
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- JP
- Japan
- Prior art keywords
- coating
- coating composition
- weight
- parts
- refractory aggregate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Description
【０００１】
【従来の技術】
一般に塗型剤は、溶媒中にジルコン、マグネシア、シリカ、アルミナ、黒鉛等の耐火骨材を分散したものであるが、分散安定性が悪く、塗布が不均一になると、品質の安定した鋳物が得られない。その改良のため特開平１−224136号公報記載の界面活性剤とセルロースエーテルを含有するもの、特許第2647856号記載のアルキル化セルロースのアルキレンオキサイド付加物を含有するものなどが報告されているが、なお不十分である。
【０００２】
【発明が解決しようとする課題】
本発明は、分散安定性に優れ、塗膜強度も十分で品質の安定した鋳物が得られる塗型剤の提供を課題とする。
【０００３】
【課題を解決するための手段】
本発明は、ＢＥＴ比表面積が30〜400m2/gのシリカ微粉末を含有する鋳造用塗型剤組成物である。本発明の塗型剤組成物は、通常使用されている塗型剤と同様に、耐火骨材、溶剤、及び必要に応じて粘結剤、添加剤等からなるものであるが、このシリカ微粉末は添加剤の一種として配合される。
【０００４】
一般に、塗型剤中の耐火骨材であるジルコン、マグネシア、シリカ、アルミナ、黒鉛等の平均粒子径は約１〜100μm（ＢＥＴ比表面積は通常10m2/g以下）である。平均粒子径を小さくすれば分散安定性は一般に向上するが、鋳型へ過剰に浸透し、被覆量の制御が困難となる。本発明は、耐火骨材の粒子径の制御ではなく、ＢＥＴ比表面積が30〜400m2/g、好ましくは50〜200m2/gのシリカ微粉末を配合することにより、分散安定性の向上を図ったものである。
【０００５】
【発明の実施の形態】
上記のシリカ微粉末の添加量は、分散安定性を向上させると共に所望の塗膜強度を得る観点から、塗型剤中の耐火骨材100重量部に対し0.5〜20重量部が好ましい。より好ましくは１〜10重量部、特に好ましくは２〜５重量部である。
【０００６】
本発明の塗型剤組成物に含まれる耐火骨材としては、ジルコン、シリカ、マグネシア、アルミナ、シャモット、粘土鉱物、黒鉛等の粉末が挙げられる。これら耐火骨材は鋳物の焼着防止を主目的とする。
【０００７】
塗型剤組成物の溶媒としては、油性塗型剤の場合は、メタノール、エタノール、イソプロピルアルコール等のアルコール類、キシレン、トルエン等の芳香族溶剤、ミネラルスピリット等の炭化水素系溶剤が使用できる。一般にはアルコール類が主溶剤として使用され、芳香族溶剤及び炭化水素系溶剤は補助溶剤として使用される。水性塗型剤の場合は水が主溶媒となる。添加量は耐火骨材100重量部に対し、10〜100重量部が好ましい。
【０００８】
本発明の塗型剤組成物には、通常使用されるような粘結剤を配合できる。例えば、常温で強い塗膜を形成できるフェノール、ロジン、石油樹脂のような有機粘結剤や、鋳込み時に塗膜の熱間強度を上げるためのベントナイト、エチルシリケート、ケイ酸ソーダなどの無機粘結剤がある。条件によりこれらのものを併用してもよい。添加量は耐火骨材100重量部に対し、0.5〜10重量部が好ましい。
【０００９】
また本発明の塗型剤組成物には、上記シリカ微粉末に加え、特許第2647856号に記載されたアルキル化セルロースのアルキレンオキサイド付加物などの増粘剤など他の添加剤も併用できる。
【００１０】
【実施例】
耐火骨材、粘結剤、溶媒及び増粘剤を表１に示す種類及び量で用い、これに対して表２に示す種類及び量の添加物を加え、塗型剤組成物を調製した。なお表２の添加量は、表１の耐火骨材100重量部に対する重量部である。
【００１１】
【表１】
得られた塗型剤組成物を十分に攪拌後にガラス製沈降管（直径25mm、深さ25cm）に20cmの深さまで注ぎ、衝撃、振動のない安定な場所に放置し、１時間、２時間、及び24時間後の上澄み液の深さを測定して分散安定性を評価した。またこれらの塗型剤組成物をフラン樹脂（フルフリルアルコール・尿素・ホルムアルデヒド重縮合物）で硬化させた砂型に塗布し、直後に着火、30分間放置して得られた塗膜を鉛筆（ＨＢ）で引っかき、以下により塗膜強度を測定した。
【００１３】
○：塗膜が剥離しない
△：塗膜が少し剥離する
×：塗膜が剥離し砂型表面が見える
以上の結果を表２に示す。
【００１４】
【表２】
【発明の効果】
本発明の塗型剤組成物は、ごく少量の添加で分散安定性を改善でき、十分な塗膜強度も得られる。[0001]
[Prior art]
In general, the coating agent is a dispersion of refractory aggregates such as zircon, magnesia, silica, alumina, and graphite in a solvent, but the dispersion stability is poor, and when the coating becomes uneven, a casting with stable quality can be obtained. I can't get it. For the improvement, those containing a surfactant and cellulose ether described in JP-A-1-224136, those containing an alkylene oxide adduct of alkylated cellulose described in Patent No. 2647856 have been reported, It is still insufficient.
[0002]
[Problems to be solved by the invention]
An object of the present invention is to provide a coating agent that is excellent in dispersion stability, has sufficient coating film strength, and provides a casting with stable quality.
[0003]
[Means for Solving the Problems]
The present invention is a casting coating composition containing silica fine powder having a BET specific surface area of 30 to 400 m 2 / g. The coating composition of the present invention is composed of a refractory aggregate, a solvent, and, if necessary, a binder, an additive and the like in the same manner as a coating composition that is usually used. Powder is blended as a kind of additive.
[0004]
In general, the average particle size of zircon, magnesia, silica, alumina, graphite, etc., which are refractory aggregates in the coating agent, is about 1 to 100 μm (the BET specific surface area is usually 10 m 2 / g or less). If the average particle size is reduced, the dispersion stability is generally improved, but it excessively penetrates into the mold, making it difficult to control the coating amount. The present invention does not control the particle size of the refractory aggregate, but improves the dispersion stability by blending silica fine powder having a BET specific surface area of 30 to 400 m 2 / g, preferably 50 to 200 m 2 / g. It is intended.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
The addition amount of the above silica fine powder is preferably 0.5 to 20 parts by weight with respect to 100 parts by weight of the refractory aggregate in the coating agent from the viewpoint of improving dispersion stability and obtaining desired coating strength. More preferably, it is 1-10 weight part, Most preferably, it is 2-5 weight part.
[0006]
Examples of the refractory aggregate contained in the coating composition of the present invention include powders such as zircon, silica, magnesia, alumina, chamotte, clay mineral, and graphite. These refractory aggregates are primarily intended to prevent casting seizure.
[0007]
As the solvent for the coating composition, in the case of oil-based coating agents, alcohols such as methanol, ethanol and isopropyl alcohol, aromatic solvents such as xylene and toluene, and hydrocarbon solvents such as mineral spirit can be used. In general, alcohols are used as main solvents, and aromatic solvents and hydrocarbon solvents are used as auxiliary solvents. In the case of an aqueous coating agent, water is the main solvent. The addition amount is preferably 10 to 100 parts by weight with respect to 100 parts by weight of the refractory aggregate.
[0008]
The coating composition of the present invention can contain a binder as commonly used. For example, organic binders such as phenol, rosin, and petroleum resin that can form strong coatings at room temperature, and inorganic binders such as bentonite, ethyl silicate, and sodium silicate to increase the hot strength of the coating during casting. There is an agent. These may be used in combination depending on conditions. The addition amount is preferably 0.5 to 10 parts by weight with respect to 100 parts by weight of the refractory aggregate.
[0009]
In addition to the silica fine powder, other additives such as a thickener such as an alkylene oxide adduct of alkylated cellulose described in Japanese Patent No. 2647856 can be used in combination with the coating composition of the present invention.
[0010]
【Example】
A refractory aggregate, a binder, a solvent, and a thickener were used in the types and amounts shown in Table 1, and the types and amounts of additives shown in Table 2 were added thereto to prepare a coating composition. In addition, the addition amount of Table 2 is a weight part with respect to 100 weight part of refractory aggregates of Table 1.
[0011]
[Table 1]
The obtained coating composition is sufficiently stirred and then poured into a glass settling tube (diameter 25 mm, depth 25 cm) to a depth of 20 cm and left in a stable place free from impact and vibration for 1 hour, 2 hours, The dispersion stability was evaluated by measuring the depth of the supernatant after 24 hours. Also, these coating agent compositions were applied to a sand mold cured with furan resin (furfuryl alcohol / urea / formaldehyde polycondensate), immediately ignited, and allowed to stand for 30 minutes. The film strength was measured as follows.
[0013]
○: The coating film does not peel Δ: The coating film peels a little ×: The results of the coating film peeling and the sand mold surface being visible are shown in Table 2.
[0014]
[Table 2]
【The invention's effect】
The coating composition of the present invention can improve the dispersion stability with a very small amount of addition, and can provide sufficient coating strength.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23050398A JP3801788B2 (en) | 1998-08-17 | 1998-08-17 | Casting composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23050398A JP3801788B2 (en) | 1998-08-17 | 1998-08-17 | Casting composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000051994A JP2000051994A (en) | 2000-02-22 |
| JP3801788B2 true JP3801788B2 (en) | 2006-07-26 |
Family
ID=16908793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23050398A Expired - Fee Related JP3801788B2 (en) | 1998-08-17 | 1998-08-17 | Casting composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3801788B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105108054A (en) * | 2015-09-28 | 2015-12-02 | 山东永和精密金属有限公司 | Transition layer coating for manufacturing shell of precision casting and preparation method of transition layer coating |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107442741A (en) * | 2017-08-21 | 2017-12-08 | 马鞍山市三川机械制造有限公司 | A kind of preparation method of high-quality cast paint |
| CN114180992B (en) * | 2021-11-16 | 2022-10-11 | 山东山科生态环境研究院有限公司 | Powder falling prevention film covering agent for vitrified aggregate biscuit, film covering system and film covering method |
-
1998
- 1998-08-17 JP JP23050398A patent/JP3801788B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105108054A (en) * | 2015-09-28 | 2015-12-02 | 山东永和精密金属有限公司 | Transition layer coating for manufacturing shell of precision casting and preparation method of transition layer coating |
| CN105108054B (en) * | 2015-09-28 | 2016-05-04 | 山东永和精密金属有限公司 | A kind of precision casting transition zone coating and its preparation method and application for shell processed |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000051994A (en) | 2000-02-22 |
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