JPH0829393B2 - Sulfurization preventive coating agent for organic binder mold - Google Patents
Sulfurization preventive coating agent for organic binder moldInfo
- Publication number
- JPH0829393B2 JPH0829393B2 JP62169411A JP16941187A JPH0829393B2 JP H0829393 B2 JPH0829393 B2 JP H0829393B2 JP 62169411 A JP62169411 A JP 62169411A JP 16941187 A JP16941187 A JP 16941187A JP H0829393 B2 JPH0829393 B2 JP H0829393B2
- Authority
- JP
- Japan
- Prior art keywords
- coating agent
- organic binder
- mold
- sulfurization
- carbonate
- 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
Links
Landscapes
- Mold Materials And Core Materials (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、鋳込み時、有機粘結剤鋳型の熱分解に起因
し、鋳物表面近傍に生ずる浸硫現象を防止する有機粘結
剤鋳型用塗型剤に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is for an organic binder mold for preventing a sulfurization phenomenon caused near the surface of a casting due to thermal decomposition of the organic binder mold during casting. It relates to a coating agent.
有機粘結剤鋳型は、鋳物砂に有機粘結剤と硬化剤を添
加して製造されており、有機粘結剤としてはフラン樹脂
やフェノール樹脂等が用いられ、硬化剤としては一般に
は硫黄を含有する有機酸が用いられている。The organic binder mold is manufactured by adding an organic binder and a curing agent to foundry sand, and a furan resin or a phenol resin is used as the organic binder, and sulfur is generally used as the curing agent. The contained organic acid is used.
有機粘結剤鋳型は、高い生産性と、古砂の回収、再生
が容易であることなどの優れた特徴を有するため、近年
多く使用されている。しかし、鋳込み時、有機酸が熱分
解を起こし、SO2，H2S等の硫黄系ガスを発生する為、鋳
造品の表面に浸硫現象が生じ、鋳物の諸性質を著しく低
下させる。Organic binder molds have been widely used in recent years because they have excellent characteristics such as high productivity and easy recovery and regeneration of old sand. However, at the time of casting, the organic acid undergoes thermal decomposition to generate a sulfur-based gas such as SO 2 and H 2 S, which causes a sulfurization phenomenon on the surface of the cast product, significantly degrading various properties of the cast product.
浸硫現象による諸性質の低下として、普通鋳鋼では溶
接性、靱性の低下、ステンレス鋼では耐食性の低下があ
り、ダクタイル鋳鉄では表面層に球状化不良組織が形成
され、強度、靱性の低下が起こる。As the deterioration of various properties due to the sulfurization phenomenon, there is a decrease in weldability and toughness in ordinary cast steel and a decrease in corrosion resistance in stainless steel. .
又、硫黄とマグネシウムの反応生成物であるMgSが鋳
物中に介在し、ドロス欠陥となる。In addition, MgS, which is a reaction product of sulfur and magnesium, intervenes in the casting and becomes a dross defect.
この浸硫現象の防止対策として、硫黄系ガスと親和性
の強い物質を添加した塗型剤を利用する方法が考えられ
る。例えば、CaO,CaCO3，MnO2，Fe2O3,ZnO,マンガン合
金粉末等を添加した塗型剤は公知であるが、その効果は
不十分であった。As a measure to prevent this sulfurization phenomenon, a method of using a coating agent to which a substance having a strong affinity with a sulfur-based gas is added can be considered. For example, a coating agent containing CaO, CaCO 3 , MnO 2 , Fe 2 O 3 , ZnO, manganese alloy powder, etc. is known, but its effect was insufficient.
本発明者らは、上記の問題点を解決すべく、鋭意検討
した結果、硫黄との親和性の強い特定の金属の炭酸化合
物を含有する塗型剤を有機粘結剤鋳型表面に塗布する事
により、鋳物表面部の浸硫現象を防止し得ることを見出
し本発明を完成するに到った。In order to solve the above problems, the inventors of the present invention have conducted extensive studies, and as a result, apply a coating agent containing a carbonic acid compound of a specific metal having a strong affinity for sulfur to the surface of the organic binder template. As a result, they have found that it is possible to prevent the sulfurization phenomenon on the surface of the casting, and have completed the present invention.
即ち、本発明は、原子番号が24から30までの金属から
選ばれる１種又は２種以上の金属の炭酸化合物を含有す
ることを特徴とする有機粘結剤鋳型用浸硫防止塗型剤を
提供するものである。That is, the present invention provides an anti-vulcanization type coating agent for an organic binder template, which contains a carbonic acid compound of one or more metals selected from metals having an atomic number of 24 to 30. It is provided.
本発明における原子番号が24から30までの金属の炭酸
化合物としては、炭酸マンガン、炭酸亜鉛、炭酸ニッケ
ル、炭酸銅等が挙げられ、特に炭酸マンガン、炭酸亜鉛
が優れた浸硫現象防止効果を有する。炭酸マンガン、炭
酸亜鉛は工業的に精製されたものはもちろん、その成分
を主成分とする天然金属石を単に粉砕加工したものでも
用いることができる。Examples of the carbonic acid compound of the metal having an atomic number of 24 to 30 in the present invention include manganese carbonate, zinc carbonate, nickel carbonate, copper carbonate and the like, and particularly manganese carbonate and zinc carbonate have excellent vulcanization preventing effect. . As manganese carbonate and zinc carbonate, not only industrially purified ones but also natural metal stones containing the components as the main component, which are simply crushed, can be used.
本発明の炭酸化合物は１種単独で又は二種以上を併用
して用いることができる。The carbonic acid compounds of the present invention can be used alone or in combination of two or more.
本発明の塗型剤は上記の金属の炭酸化合物以外に、一
般の塗型剤に用いられている耐火物、粘結剤、溶剤を含
有する。The coating agent of the present invention contains a refractory, a binder and a solvent which are used in general coating agents, in addition to the above-mentioned metal carbonate compound.
耐火物は鋳物の焼着防止効果を主目的として用いら
れ、例えばジルコン、シリカ、シャモット、アルミナシ
リケート、アルミナ、粘土鉱物、黒鉛等の粉末がある。The refractory is used mainly for the purpose of preventing the seizure of the casting, and examples thereof include powders of zircon, silica, chamotte, alumina silicate, alumina, clay minerals, graphite and the like.
粘結剤には、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と、鋳込み
時、塗膜の熱間強度を上げるための、有機ベントナイ
ト、エチルシリケート、ケイ酸ソーダのような無機粘結
剤があり、使用条件に適したものを併用することができ
る。Organic binders such as phenol, rosin and petroleum resin that can form a strong coating film at room temperature are used as the binder, and organic bentonite, ethyl silicate and silica are used to increase the hot strength of the coating film during casting. There is an inorganic binder such as acid soda, and those suitable for the use conditions can be used in combination.
溶剤としては、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、ヘキサン、ミネラルスピリット等の炭化
水素系溶剤が使用でき、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。As the solvent, alcohols such as methanol, ethanol and isopropyl alcohol, aromatic solvents such as xylene and toluene, hydrocarbon solvents such as hexane and mineral spirits can be used, and alcohols are used as the main solvent. And hydrocarbon solvents are used as auxiliary solvents.
本発明の塗型剤中の炭酸化合物の含有量は、耐火物10
0重量部に対し５〜40重量部が望ましい。又、CaCO3,Ca
O,MnO2,ZnO,Fe2O3等を併用しても良い。The content of the carbonate compound in the coating agent of the present invention is 10%
5 to 40 parts by weight is desirable with respect to 0 parts by weight. Also, CaCO 3 , Ca
O, MnO 2, ZnO, may be used in combination Fe 2 O 3 or the like.
以下、実施例により本発明を更に詳細に説明するが、
本発明はこれらの実施例に限定されるものではない。Hereinafter, the present invention will be described in more detail with reference to Examples.
The present invention is not limited to these examples.
実施例１〜4,比較例１〜４ 硅砂再生砂100重量部に対し、フラン樹脂0.8重量部、
キシレンスルホン酸0.4重量部を添加してなるフラン砂
で鋳型を作り、その鋳型表面に以下に示す組成を有する
塗型剤を刷毛塗りし、これにFCD−45の組成をもつ溶融
金属を鋳込んだ。鋳造品の形状は100×100×300mmの直
方体である。Examples 1 to 4, Comparative Examples 1 to 4 0.8 parts by weight of furan resin based on 100 parts by weight of reclaimed silica sand,
A mold is made of furan sand to which 0.4 part by weight of xylene sulfonic acid is added, and a mold coating agent having the composition shown below is brushed on the surface of the mold, and a molten metal having the composition of FCD-45 is cast into the mold. It is. The shape of the cast product is a rectangular parallelepiped of 100 × 100 × 300 mm.
この鋳造品を中央部（端から150mmの位置）で２等分
に切断し、その断面で鋳物下部のコーナーを顕微鏡観察
し、球状化不良層の厚さをコーナー先端からの距離で求
めた。This cast product was cut into two equal parts at the center (at a position of 150 mm from the end), the corner of the lower part of the cast was observed with a microscope in the cross section, and the thickness of the poor spheroidizing layer was determined by the distance from the tip of the corner.
その結果を第１表に示す。 The results are shown in Table 1.
〈塗型剤組成〉 耐火物： ジルコン 80重量部 黒鉛 20 粘結剤： 有機ベントナイト ２ フェノール １ 溶剤： メタノール 55 トルエン ５ 炭酸化合物又は他の添加物（第１表）： 15 〔発明の効果〕 第１表から明らかなように、本発明の有機粘結剤鋳型
用浸硫防止塗型剤を用いた場合、従来から用いられてい
る塗型剤に比較して著しい浸硫防止効果が認められ、有
機粘結剤鋳型を用いても表面に浸硫のない鋳物を作るこ
とができるのでその工業的価値は極めて大きい。<Coating agent composition> Refractory: Zircon 80 parts by weight Graphite 20 Binder: Organic bentonite 2 Phenol 1 Solvent: Methanol 55 Toluene 5 Carbonate compound or other additives (Table 1): 15 [Effects of the Invention] As is clear from Table 1, when the vulcanization-preventing type coating agent for an organic binder mold of the present invention is used, remarkable vulcanization is achieved as compared with the conventional type coating agent. The preventive effect is recognized, and even if an organic binder mold is used, a casting without sulfurization on the surface can be produced, so that its industrial value is extremely large.
Claims (2)
る１種又は２種以上の金属の炭酸化合物を含有すること
を特徴とする有機粘結剤鋳型用浸硫防止塗型剤。1. An anti-sulfurization type coating agent for an organic binder template, comprising a carbonic acid compound of one or more metals selected from metals having an atomic number of 24 to 30.
亜鉛である特許請求の範囲第１項記載の有機粘結剤鋳型
用浸硫防止塗型剤。2. The anti-sulfur coating agent for an organic binder mold according to claim 1, wherein the metal carbonate compound is manganese carbonate or zinc carbonate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62169411A JPH0829393B2 (en) | 1987-07-07 | 1987-07-07 | Sulfurization preventive coating agent for organic binder mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62169411A JPH0829393B2 (en) | 1987-07-07 | 1987-07-07 | Sulfurization preventive coating agent for organic binder mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6415246A JPS6415246A (en) | 1989-01-19 |
| JPH0829393B2 true JPH0829393B2 (en) | 1996-03-27 |
Family
ID=15886101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62169411A Expired - Fee Related JPH0829393B2 (en) | 1987-07-07 | 1987-07-07 | Sulfurization preventive coating agent for organic binder mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0829393B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4507268B2 (en) * | 2000-12-18 | 2010-07-21 | 日本曹達株式会社 | Manufacturing method of cast metal ingot |
| CN107537970B (en) * | 2016-09-28 | 2018-11-13 | 湖北工业大学 | A kind of powdery cast paint and its preparation and application method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS574352A (en) * | 1980-06-09 | 1982-01-09 | Mitsubishi Heavy Ind Ltd | Method for preventing sulfurization of cast steel casting |
| JPS5759011A (en) * | 1980-09-29 | 1982-04-09 | Hitachi Ltd | Device for removing operative medium in lubricating oil in turbine installation using low boiling point operative medium |
-
1987
- 1987-07-07 JP JP62169411A patent/JPH0829393B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6415246A (en) | 1989-01-19 |
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Legal Events
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| R250 | Receipt of annual fees |
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| LAPS | Cancellation because of no payment of annual fees |