JP2002321036A - Facing material and coating method - Google Patents
Facing material and coating methodInfo
- Publication number
- JP2002321036A JP2002321036A JP2001130673A JP2001130673A JP2002321036A JP 2002321036 A JP2002321036 A JP 2002321036A JP 2001130673 A JP2001130673 A JP 2001130673A JP 2001130673 A JP2001130673 A JP 2001130673A JP 2002321036 A JP2002321036 A JP 2002321036A
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- mass
- parts
- silica sol
- average particle
- fire
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- 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.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、鋳物を製造する際
に用いる鋳型表面又は模型表面等に塗装する塗型剤に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating agent for coating a mold surface or a model surface used for producing a casting.
【０００２】[0002]
【従来の技術】鋳型に注湯して鋳物を製造する際、鋳型
表面が溶湯の熱にさらされ、破壊されやすい状態にな
る。これを防止するため、従来より、鋳型表面に塗型剤
を塗装することが行われている。また、合成樹脂発泡体
よりなる消失鋳型を使用して鋳型を製造する際には、消
失模型表面に塗型剤を塗装しておき、鋳型が溶湯の熱に
さらされないようにすることも行われている。2. Description of the Related Art When a casting is manufactured by pouring a molten metal into a mold, the surface of the mold is exposed to the heat of the molten metal and becomes easily broken. In order to prevent this, conventionally, a coating agent is applied to the surface of a mold. When a mold is manufactured using a disappearing mold made of a synthetic resin foam, a mold wash is applied to the surface of the disappearing model so that the mold is not exposed to the heat of the molten metal. ing.
【０００３】このような塗型剤を使用した場合であって
も、塗型膜（塗型剤を塗装して形成される膜）にヒビ割
れがあると、溶湯が塗型膜のヒビ割れ部分から鋳型の砂
粒中へ侵入し、鋳物に焼着欠陥が生じるということがあ
った。このため、ヒビ割れを防止するものとして、特開
昭５３−３９２１６号公報に記載されたような塗型剤が
提案されている。この塗型剤は、耐火性骨材と、ＳｉＯ
2を生成するエチルシリケート加水分解溶液と、天然ロ
ジンとを含有するものであり、特に天然ロジンが添加さ
れていることによって、塗型膜のヒビ割れを防止すると
いうものである。[0003] Even when such a coating agent is used, if the coating film (film formed by coating the coating agent) has cracks, the molten metal may have cracks on the coating film. From the mold into the sand grains of the casting mold, causing a seizure defect in the casting. For this reason, a coating agent described in JP-A-53-39216 has been proposed to prevent cracking. This mold wash comprises a refractory aggregate, SiO 2
It contains a hydrolyzed solution of ethyl silicate for producing 2 , and natural rosin. Particularly, the addition of natural rosin prevents cracks in the coating film.
【０００４】[0004]
【発明が解決しようとする課題】本発明も、塗型膜にヒ
ビ割れが生じにくい塗型剤を提供することを目的とする
ものである。しかし、特開昭５３−３９２１６号公報記
載の技術とは異なり、平均粒子径が４０ｎｍ以上である
シリカゾルを添加することにより、塗型膜のヒビ割れを
防止しようというものである。なお、塗型剤に、平均粒
子径が１０〜３０ｎｍのシリカゾルを含有させたものと
して、特開昭５０−２６２３号公報、特開昭５５−６１
３４８号公報、特開昭６２−２８９３４３号公報、特開
平１−２１８７３５号公報等がある。しかし、この平均
粒子径の小さいシリカゾルは、塗型膜の強度を向上させ
るための粘結剤の一種であり、本発明の目的とする塗型
膜のヒビ割れ防止には、顕著な効果はなく、逆にその凝
集力により、ヒビ割れを促進する傾向が見られる。An object of the present invention is to provide a coating agent which is less likely to cause cracks in the coating film. However, unlike the technique described in JP-A-53-39216, it is intended to prevent cracks in the coating film by adding silica sol having an average particle diameter of 40 nm or more. As a coating composition containing silica sol having an average particle diameter of 10 to 30 nm, JP-A-50-2623 and JP-A-55-61.
348, JP-A-62-289343, JP-A-1-218735 and the like. However, the silica sol having a small average particle size is a kind of a binder for improving the strength of the coating film, and has no remarkable effect in preventing cracks of the coating film intended for the present invention. On the contrary, the cohesive force tends to promote cracking.
【０００５】[0005]
【課題を解決するための手段】本発明は、耐火性骨材
と、水又は低級アルコールと、平均粒子径が４０ｎｍ以
上、好ましくは７０〜５００ｎｍであるシリカゾルとを
含有することを特徴とする塗型剤に関するものである。According to the present invention, there is provided a coating composition comprising a refractory aggregate, water or a lower alcohol, and a silica sol having an average particle diameter of 40 nm or more, preferably 70 to 500 nm. It concerns the mold.
【０００６】本発明で用いる耐火性骨材としては、従来
公知のものであれば、どのようなものでも使用すること
ができる。具体的には、黒鉛，ジルコン，マグネシア，
アルミナ，シリカ，雲母等を単独で又は混合して用いる
ことができる。特に、本発明においては、雲母を含有す
る耐火性骨材を用いるのが好ましい。耐火性骨材中の雲
母の含有量は５〜９０重量％が好ましく、１０〜５０重
量％がより好ましい。なお、雲母は、雲母群とも呼ば
れ、アルカリ金属を含むアルミノケイ酸塩である（化学
大辞典１巻、昭和４３年７月１日、第６刷、共立出版株
式会社）。雲母には、天然雲母と人工雲母があり、天然
雲母としては、白雲母、金雲母、黒雲母等が用いられ、
特に白雲母を用いるのが好ましい。人工雲母としては、
フッ素金雲母、フッ素四ケイ素雲母、テニオライト等の
フッ素雲母等が用いられる。As the refractory aggregate used in the present invention, any conventionally known refractory aggregate can be used. Specifically, graphite, zircon, magnesia,
Alumina, silica, mica or the like can be used alone or as a mixture. In particular, in the present invention, it is preferable to use a fire-resistant aggregate containing mica. The content of mica in the refractory aggregate is preferably 5 to 90% by weight, more preferably 10 to 50% by weight. Mica is also called mica group and is an aluminosilicate containing an alkali metal (Chemical Encyclopedia, Volume 1, July 1, 1968, 6th printing, Kyoritsu Shuppan Co., Ltd.). Mica includes natural mica and artificial mica. As natural mica, muscovite, phlogopite, biotite, etc. are used.
It is particularly preferable to use muscovite. As artificial mica,
Fluorphlogopite, fluorine tetrasilicic mica, fluorine mica such as teniolite and the like are used.
【０００７】本発明で用いる水又は低級アルコールは、
耐火性骨材１００質量部に対して、３０〜１５０質量部
程度であるのが好ましい。水又は低級アルコールの量が
３０質量部未満であると、得られる塗型剤の粘度が高く
なり、塗装しにくくなる傾向が生じる。また、水又は低
級アルコールの量が１５０質量部を超えると、塗型剤の
粘度が低すぎて、この場合も塗装しにくくなる傾向が生
じる。なお、本発明で用いる低級アルコールとしては、
メタノール，エタノール，プロパノール，ブタノール等
が用いられる。The water or lower alcohol used in the present invention is
It is preferably about 30 to 150 parts by mass with respect to 100 parts by mass of the refractory aggregate. When the amount of water or lower alcohol is less than 30 parts by mass, the viscosity of the obtained coating composition becomes high, and the coating tends to be difficult. On the other hand, when the amount of water or lower alcohol exceeds 150 parts by mass, the viscosity of the coating composition is too low, and in this case, coating tends to be difficult. The lower alcohol used in the present invention includes
Methanol, ethanol, propanol, butanol and the like are used.
【０００８】本発明で用いるシリカゾルは、その平均粒
子径が４０ｎｍ以上のものを使用する。特に、平均粒子
径が７０〜５００ｎｍのものが好ましく、更には１００
〜４５０ｎｍのものが最も好ましい。ここで、平均粒子
径は、ＢＥＴ法で求めたものである。平均粒子径が４０
ｎｍ未満のものを使用すると、得られる塗型膜のヒビ割
れを十分に防止することができず、却ってヒビ割れが生
じる傾向がある。シリカゾルは、耐火性骨材１００質量
部に対して、０．５〜３０質量部程度が好ましく、特に
１〜２０質量部程度がより好ましい。シリカゾルの量が
０．５質量部未満になると、ヒビ割れ防止の効果が不十
分になる傾向が生じる。また、シリカゾルの量が３０質
量部を超えると、効果が飽和傾向となり、経済的ではな
い。また、耐火性骨材として雲母を含有するものを用い
た場合、シリカゾルと雲母の共働作用により、ヒビ割れ
防止の効果がより顕著になる。雲母を含有する耐火性骨
材の場合、シリカゾルの量は比較的少なくて良く、耐火
性骨材１００質量部に対して、０．５〜１０質量部程度
で良く、好ましくは２〜９質量部程度で良い。The silica sol used in the present invention has an average particle diameter of 40 nm or more. In particular, those having an average particle diameter of 70 to 500 nm are preferable,
４５０450 nm is most preferred. Here, the average particle diameter is determined by the BET method. Average particle size 40
When the thickness is less than nm, cracks in the obtained coating film cannot be sufficiently prevented, and cracks tend to occur. The silica sol is preferably about 0.5 to 30 parts by mass, more preferably about 1 to 20 parts by mass, based on 100 parts by mass of the refractory aggregate. When the amount of the silica sol is less than 0.5 parts by mass, the effect of preventing cracks tends to be insufficient. If the amount of the silica sol exceeds 30 parts by mass, the effect tends to be saturated, which is not economical. Further, when a material containing mica is used as the refractory aggregate, the effect of preventing cracks becomes more remarkable due to the synergistic action of silica sol and mica. In the case of the refractory aggregate containing mica, the amount of the silica sol may be relatively small, and may be about 0.5 to 10 parts by mass, preferably 2 to 9 parts by mass with respect to 100 parts by mass of the refractory aggregate. The degree is good.
【０００９】本発明に係る塗型剤には、耐火性骨材、水
又は低級アルコール、平均粒子径が４０ｎｍ以上のシリ
カゾルの他に、従来公知の各種物質が含有されていても
よい。例えば、塗型膜の強度向上のためのベントナイト
（有機ベントナイトを含む。）や、ポリアクリル酸ナト
リウム，澱粉，メチルセルロース，ポリビニルアルコー
ル，アルギン酸ナトリウム，ポリ酢酸ビニル，ノボラッ
ク型フェノール樹脂等の粘結剤が含有されていてもよ
い。これらの添加量は、耐火性骨材１００重量部に対し
て、０．５〜１０質量部程度が好ましい。The coating composition according to the present invention may contain various conventionally known substances in addition to the refractory aggregate, water or lower alcohol, and silica sol having an average particle diameter of 40 nm or more. For example, a binding agent such as bentonite (including organic bentonite) for improving the strength of a coating film and sodium polyacrylate, starch, methylcellulose, polyvinyl alcohol, sodium alginate, polyvinyl acetate, and novolak type phenol resin are used. It may be contained. The amount of these additives is preferably about 0.5 to 10 parts by weight based on 100 parts by weight of the refractory aggregate.
【００１０】本発明に係る塗型剤は、鋳型表面に塗装し
て塗型膜を形成させる。そして、塗型膜が形成された鋳
型に、溶湯を注ぐことによって、鋳物を得ることができ
る。また、合成樹脂発泡体からなる消失模型表面に塗装
して塗型膜を形成させてもよい。この場合は、消失模型
を埋設して鋳型を作製し、鋳型中の消失模型の箇所に溶
湯を注ぐことによって、鋳物を得ることができる。The coating composition according to the present invention is applied to the surface of a mold to form a coating film. Then, a casting can be obtained by pouring the molten metal into the mold on which the coating film is formed. Further, a coating film may be formed by painting on the surface of the disappearing model made of synthetic resin foam. In this case, a casting can be obtained by burying the disappearing model to produce a mold and pouring the molten metal into the location of the disappearing model in the mold.
【００１１】[0011]
【実施例】以下、実施例に基づいて本発明を説明する
が、本発明は実施例に限定されるものではない。本発明
は、塗型剤に、平均粒子径が４０ｎｍ以上であるシリカ
ゾルとを含有させておくと、得られる塗型膜にヒビ割れ
が生じにくいとの知見に基づくものとして、解釈される
べきである。Hereinafter, the present invention will be described based on examples, but the present invention is not limited to the examples. The present invention should be construed as based on the finding that if the coating agent contains silica sol having an average particle size of 40 nm or more, cracks are unlikely to occur in the obtained coating film. is there.
【００１２】以下の組成よりなる実施例１〜５、比較例
１及び２に係る塗型剤を得た。 実施例１ シリカ（耐火性骨材） ３０．０質量部 ジルコンフラワー（耐火性骨材） １２．０質量部 黒鉛（耐火性骨材） １０．０質量部 界面活性剤（市販ノニオン系界面活性剤） ３．０質量部 ベントナイト ２．５質量部 ポリ酢酸ビニル樹脂（固形分） ２．０質量部 シリカゾル（平均粒子径７０〜１００ｎｍ） ５．２質量部 （日産化学工業（株）製 スノーテックス ＳＴ−ＺＬ） 水 ３５．３質量部Coating compositions according to Examples 1 to 5 and Comparative Examples 1 and 2 having the following compositions were obtained. Example 1 Silica (fire-resistant aggregate) 30.0 parts by mass Zircon flower (fire-resistant aggregate) 12.0 parts by mass Graphite (fire-resistant aggregate) 10.0 parts by mass Surfactant (commercially available nonionic surfactant) 3.0 parts by mass Bentonite 2.5 parts by mass Polyvinyl acetate resin (solid content) 2.0 parts by mass Silica sol (average particle diameter 70 to 100 nm) 5.2 parts by mass (Snowtex ST manufactured by Nissan Chemical Industries, Ltd.) -ZL) 35.3 parts by mass of water
【００１３】 実施例２ シリカ（耐火性骨材） ３０．０質量部 ジルコンフラワー（耐火性骨材） １２．０質量部 黒鉛（耐火性骨材） １０．０質量部 界面活性剤（市販ノニオン系界面活性剤） ３．０質量部 ベントナイト ２．５質量部 ポリ酢酸ビニル樹脂（固形分） ２．０質量部 シリカゾル（平均粒子径４０〜５０ｎｍ） １．３質量部 （日産化学工業（株）製 スノーテックス ＳＴ−ＯＬ） 水 ３９．２質量部Example 2 Silica (refractory aggregate) 30.0 parts by mass Zircon flour (refractory aggregate) 12.0 parts by mass Graphite (refractory aggregate) 10.0 parts by mass Surfactant (commercially available nonionic type) (Surfactant) 3.0 parts by mass Bentonite 2.5 parts by mass Polyvinyl acetate resin (solid content) 2.0 parts by mass Silica sol (average particle diameter 40 to 50 nm) 1.3 parts by mass (manufactured by Nissan Chemical Industries, Ltd.) Snowtex ST-OL) 39.2 parts by mass of water
【００１４】 実施例３ シリカ（耐火性骨材） ３０．０質量部 ジルコンフラワー（耐火性骨材） １２．０質量部 黒鉛（耐火性骨材） １０．０質量部 界面活性剤（市販ノニオン系界面活性剤） ３．０質量部 ベントナイト ２．５質量部 ポリ酢酸ビニル樹脂（固形分） ２．０質量部 シリカゾル（平均粒子径１００ｎｍ） ５．２質量部 （日産化学工業（株）製 スノーテックス ＭＰ−１０４０） 水 ３５．３質量部Example 3 Silica (refractory aggregate) 30.0 parts by mass Zircon flour (refractory aggregate) 12.0 parts by mass Graphite (refractory aggregate) 10.0 parts by mass Surfactant (commercially available nonionic type) (Surfactant) 3.0 parts by mass Bentonite 2.5 parts by mass Polyvinyl acetate resin (solid content) 2.0 parts by mass Silica sol (average particle diameter 100 nm) 5.2 parts by mass (Snowtex manufactured by Nissan Chemical Industries, Ltd.) MP-1040) 35.3 parts by mass of water
【００１５】 実施例４ シリカ（耐火性骨材） ３０．０質量部 ジルコンフラワー（耐火性骨材） １２．０質量部 黒鉛（耐火性骨材） １０．０質量部 界面活性剤（市販ノニオン系界面活性剤） ３．０質量部 ベントナイト ２．５質量部 ポリ酢酸ビニル樹脂（固形分） ２．０質量部 シリカゾル（平均粒子径４５０ｎｍ） ５．２質量部 （日産化学工業（株）製 スノーテックス ＭＰ−４５４０） 水 ３５．３質量部Example 4 Silica (fire-resistant aggregate) 30.0 parts by mass Zircon flour (fire-resistant aggregate) 12.0 parts by mass Graphite (fire-resistant aggregate) 10.0 parts by mass Surfactant (commercially available nonionic type) (Surfactant) 3.0 parts by mass Bentonite 2.5 parts by mass Polyvinyl acetate resin (solid content) 2.0 parts by mass Silica sol (average particle diameter 450 nm) 5.2 parts by mass (Snowtex manufactured by Nissan Chemical Industry Co., Ltd.) MP-4540) 35.3 parts by mass of water
【００１６】 実施例５ シリカ（耐火性骨材） ３０．０質量部 ジルコンフラワー（耐火性骨材） １２．０質量部 黒鉛（耐火性骨材） １０．０質量部 界面活性剤（市販ノニオン系界面活性剤） １．０質量部 有機ベントナイト ３．０質量部 ノボラック型フェノール樹脂 ０．５質量部 シリカゾル（平均粒子径７０〜１００ｎｍ） ５．２質量部 （日産化学工業（株）製 スノーテックス ＳＴ−ＺＬ） メタノール ３３．１質量部Example 5 Silica (refractory aggregate) 30.0 parts by mass Zircon flower (refractory aggregate) 12.0 parts by mass Graphite (refractory aggregate) 10.0 parts by mass Surfactant (commercially available nonionic type) Surfactant) 1.0 parts by mass Organic bentonite 3.0 parts by mass Novolak-type phenolic resin 0.5 parts by mass Silica sol (average particle diameter 70 to 100 nm) 5.2 parts by mass (Snowtex ST manufactured by Nissan Chemical Industries, Ltd.) -ZL) 33.1 parts by mass of methanol
【００１７】 実施例６ シリカ（耐火性骨材） ３０．０質量部 白雲母（耐火性骨材） １２．０質量部 黒鉛（耐火性骨材） １０．０質量部 界面活性剤（市販ノニオン系界面活性剤） ３．０質量部 ベントナイト ２．５質量部 ポリ酢酸ビニル樹脂（固形分） ２．０質量部 シリカゾル（平均粒子径７０〜１００ｎｍ） ２．６質量部 （日産化学工業（株）製 スノーテックス ＳＴ−ＺＬ） 水 ３７．９質量部Example 6 Silica (fire-resistant aggregate) 30.0 parts by mass Muscovite (fire-resistant aggregate) 12.0 parts by mass Graphite (fire-resistant aggregate) 10.0 parts by mass Surfactant (commercially available nonionic type) (Surfactant) 3.0 parts by mass Bentonite 2.5 parts by mass Polyvinyl acetate resin (solid content) 2.0 parts by mass Silica sol (average particle diameter 70 to 100 nm) 2.6 parts by mass (manufactured by Nissan Chemical Industries, Ltd.) Snowtex ST-ZL) Water 37.9 parts by mass
【００１８】 比較例１ シリカ（耐火性骨材） ３０．０質量部 ジルコンフラワー（耐火性骨材） １２．０質量部 黒鉛（耐火性骨材） １０．０質量部 界面活性剤（市販ノニオン系界面活性剤） ３．０質量部 ベントナイト ２．５質量部 ポリ酢酸ビニル樹脂（固形分） ２．５質量部 シリカゾル（平均粒子径１０〜２０ｎｍ） ５．２質量部 （日産化学工業（株）製 スノーテックス ＳＴ−３０） 水 ３５．３質量部Comparative Example 1 Silica (fire-resistant aggregate) 30.0 parts by mass Zircon flour (fire-resistant aggregate) 12.0 parts by mass Graphite (fire-resistant aggregate) 10.0 parts by mass Surfactant (commercially available nonionic type) (Surfactant) 3.0 parts by mass Bentonite 2.5 parts by mass Polyvinyl acetate resin (solid content) 2.5 parts by mass Silica sol (average particle diameter 10 to 20 nm) 5.2 parts by mass (manufactured by Nissan Chemical Industries, Ltd.) Snowtex ST-30) 35.3 parts by mass of water
【００１９】 比較例２ シリカ（耐火性骨材） ３０．０質量部 ジルコンフラワー（耐火性骨材） １２．０質量部 黒鉛（耐火性骨材） １０．０質量部 界面活性剤（市販ノニオン系界面活性剤） ３．０質量部 ベントナイト ２．５質量部 ポリ酢酸ビニル樹脂（固形分） ２．５質量部 シリカゾル（平均粒子径１０〜２０ｎｍ） １．３質量部 （日産化学工業（株）製 スノーテックス ＳＴ−３０） 水 ３９．２質量部Comparative Example 2 Silica (fire-resistant aggregate) 30.0 parts by mass Zircon flower (fire-resistant aggregate) 12.0 parts by mass Graphite (fire-resistant aggregate) 10.0 parts by mass Surfactant (commercially available nonionic type) (Surfactant) 3.0 parts by mass Bentonite 2.5 parts by mass Polyvinyl acetate resin (solid content) 2.5 parts by mass Silica sol (average particle diameter 10 to 20 nm) 1.3 parts by mass (manufactured by Nissan Chemical Industries, Ltd.) Snowtex ST-30) 39.2 parts by mass of water
【００２０】実施例１〜５、比較例１及び２に係る各塗
型剤につき、以下の方法でヒビ割れ評価及び焼着評価を
行った。 〔ヒビ割れ評価〕各塗型剤をキッチンミキサーで十分混
合した後、発泡ポリスチレン板（発泡倍率５０倍）上に
置いたステンレス枠（縦１００ｍｍ×横１００ｍｍ×高
さ３ｍｍ）内に流し込み、５０℃の熱風で２４時間乾燥
した。そして、得られた塗型膜のヒビ割れの状態を目視
により、次のとおり、評価した。その結果を、表１に示
した。 ◎・・・ヒビ割れが全く無い。 ○・・・ヒビ割れが１〜２本有る。 △・・・ヒビ割れが３〜５本有る。 ×・・・ヒビ割れが６本以上有る。The coating compositions of Examples 1 to 5 and Comparative Examples 1 and 2 were evaluated for cracking and seizure by the following methods. [Evaluation of Crack] After each coating agent was sufficiently mixed with a kitchen mixer, the mixture was poured into a stainless steel frame (100 mm long × 100 mm wide × 3 mm high) placed on an expanded polystyrene plate (expansion ratio: 50 ×), and heated at 50 ° C. For 24 hours. Then, the state of cracks in the obtained coating film was visually evaluated as follows. The results are shown in Table 1. ◎ ・ ・ ・ No cracks.・ ・ ・: There are one or two cracks. Δ: There are 3 to 5 cracks. X: There are six or more cracks.
【００２１】〔焼着評価〕縦１７０ｍｍ×横２１０ｍｍ
×高さ２１０ｍｍの直方体形状で、上面中央に縦６０ｍ
ｍ×横１００ｍｍ×深さ１５５ｍｍの凹部を有する発泡
ポリスチレン体（発泡倍率５０倍）よりなる消失模型を
準備した。そして、各塗型剤をキッチンミキサーで十分
混合した後、この消失模型の表面に塗装し、乾燥して厚
み１ｍｍの塗型膜を形成した。塗型膜が設けられた消失
模型を、混練砂に埋設して鋳型を得た。なお、混練砂と
しては、フリーマントル珪砂（５号）１００質量部に、
有機スルホン酸硬化剤（花王クエーカー（株）製ＴＫ−
３）を０．２質量部添加混練した後に、フラン樹脂（花
王クエーカー（株）製３４０Ｂ）を珪砂１００質量部に
対して０．５質量部混合して得られたものである。そし
て、この鋳型の消失模型の箇所に、溶湯を注いで鋳込み
を行った（材質ＦＣ−２５０、鋳込み温度１４００
℃）。得られた鋳物の底部及びコーナー部における焼着
の有無を、目視により、次のとおり評価した。その結果
を、表１に示した。 ◎・・・焼着が認められない。 ○・・・焼着がわずかに認められる。 ×・・・焼着が認められる。[Evaluation of baking] 170 mm long x 210 mm wide
× A rectangular parallelepiped shape with a height of 210mm, 60m vertically in the center of the upper surface
A vanishing model made of a foamed polystyrene body (expansion ratio: 50 times) having a concave portion of mx 100 mm in width x 155 mm in depth was prepared. Then, each mold wash was sufficiently mixed with a kitchen mixer, and then applied to the surface of the disappearance model, and dried to form a mold wash film having a thickness of 1 mm. The disappearance model provided with the coating film was embedded in kneading sand to obtain a mold. In addition, as kneading sand, 100 parts by mass of Fremantle silica sand (No. 5)
Organic sulphonic acid curing agent (TK- manufactured by Kao Quaker Co., Ltd.)
After kneading and kneading 0.2 part by mass of 3), 0.5 part by mass of a furan resin (340B manufactured by Kao Quaker Co., Ltd.) is mixed with 100 parts by mass of silica sand. Then, casting was performed by pouring a molten metal into the disappearance model of the mold (material FC-250, casting temperature 1400).
° C). The presence or absence of seizure at the bottom and corners of the obtained casting was visually evaluated as follows. The results are shown in Table 1.・ ・ ・: No baking was observed.・ ・ ・: Sintering is slightly observed. ×: Baking is observed.
【００２２】 〔表１〕 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 焼着評価 ━━━━━━━━━━━━━━ ヒビ割れ評価 コーナー部 底部 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 実施例１ ○ ◎ ◎ 実施例２ ○ ○ ◎ 実施例３ ◎ ◎ ◎ 実施例４ ◎ ◎ ◎ 実施例５ ○ ◎ ◎ 実施例６ ◎ ◎ ◎ 比較例１ × × × 比較例２ △ × × ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━[Table 1] {Baking evaluation}評 価 Crack evaluation Corner bottom ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Example 1 ○ ◎ ◎ Example 2 ○ ○ ◎ Example 3 ◎ ◎ ◎ Example 4 ◎ ◎ ◎ Example 5 ○ ◎ ◎ Example 6 ◎ ◎ ◎ Comparative Example 1 × × × Comparative Example 2 △ × × ━━━━━━━━ ━━━━━━━━━━━━━━━━━━━━━━━━
【００２３】以上の実施例１〜６、比較例１及び２の結
果からも明らかなように、平均粒子径４０ｎｍ以上のシ
リカゾルが含有されている塗型剤を用いると、平均粒子
径４０ｎｍ未満のシリカゾルが含有されている塗型剤を
用いた場合と比較して、得られる塗型膜にヒビ割れが生
じにくく、しかも焼着も生じにくいことが分かる。As is clear from the results of Examples 1 to 6 and Comparative Examples 1 and 2, when a coating agent containing a silica sol having an average particle diameter of 40 nm or more is used, an average particle diameter of less than 40 nm is obtained. It can be seen that, compared to the case where a coating agent containing silica sol is used, cracks are less likely to occur in the obtained coating film, and baking is less likely to occur.
【００２４】[0024]
【作用】本発明に係る塗型剤を用いると、塗型膜にヒビ
割れが生じにくくなる作用は、定かではないが、以下の
ように推定される。即ち、平均粒子径４０ｎｍ以上とい
う比較的大粒子径のシリカゾルが存在すると、塗型剤中
の耐火性骨材等が乾燥して塗型膜が形成される際に、そ
の凝集応力が大粒子径のシリカゾルによって緩和され、
その結果、塗型膜にヒビ割れが生じにくくなるのではな
いかと推定される。The effect of using the coating composition according to the present invention to reduce the occurrence of cracks in the coating film is not clear, but is presumed as follows. That is, when a silica sol having a relatively large particle diameter of 40 nm or more in average is present, when the refractory aggregates and the like in the coating composition are dried to form a coating film, the cohesive stress of the coating film is large. Mitigated by the silica sol of
As a result, it is presumed that cracks are less likely to occur in the coating film.
【００２５】[0025]
【発明の効果】以上説明したように、本発明に係る塗型
剤を用いれば、塗型膜にヒビ割れが生じにくく、しかも
得られる鋳物に焼着欠陥が生じにくいという効果を奏す
る。As described above, the use of the coating composition according to the present invention is effective in that cracks are less likely to occur in the coating film, and that the resulting castings are less likely to cause seizure defects.
Claims (5)
と、平均粒子径が４０ｎｍ以上であるシリカゾルとを含
有する塗型剤。1. A coating composition containing a refractory aggregate, water or a lower alcohol, and silica sol having an average particle size of 40 nm or more.
ｎｍである請求項１記載の塗型剤。2. The silica sol has an average particle size of 70 to 500.
The mold wash according to claim 1, which has a thickness of nm.
項１又は２記載の塗型剤。3. The coating composition according to claim 1, wherein a refractory aggregate containing mica is used.
項に記載の塗型剤を塗装する塗装方法。4. A coating method for coating the surface of a casting mold with the coating composition according to claim 1.
か一項に記載の塗型剤を塗装する塗装方法。5. A coating method for coating the surface of the disappearing model with the mold wash of any one of claims 1 to 3.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100418666C (en) * | 2006-11-24 | 2008-09-17 | 费长正 | Alcohol zircon flour coating for heavy castings and its production method |
| CN102328018A (en) * | 2011-10-28 | 2012-01-25 | 上海市机械制造工艺研究所有限公司 | Casting surface sulfur-seepage-prevention coating for furan resin sand mould |
| CN105108053A (en) * | 2015-09-28 | 2015-12-02 | 山东永和精密金属有限公司 | Primary layer coating for manufacturing shell of precision casting and preparation method of primary layer coating |
| CN105234344A (en) * | 2015-10-30 | 2016-01-13 | 高要市鸿兴精密铸造有限公司 | Cooling coating special for lost foam casting and preparation method of cooling coating |
| WO2016080132A1 (en) * | 2014-11-18 | 2016-05-26 | 株式会社神戸製鋼所 | Evaporative pattern casting method |
| CN106391998A (en) * | 2016-12-02 | 2017-02-15 | 江麓机电集团有限公司 | Coating for sand mould low-pressure casting of aluminum alloy and preparation method thereof |
| CN113231599A (en) * | 2021-05-20 | 2021-08-10 | 云南太标精工铸造有限公司 | Casting coating capable of improving surface smoothness of casting |
| CN114671700A (en) * | 2022-02-25 | 2022-06-28 | 广东省福美材料科学技术有限公司 | Modified inorganic powder composite facing sheet with decorative pattern and preparation method thereof |
Families Citing this family (1)
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| ES2397391T3 (en) | 2004-10-05 | 2013-03-06 | Sumitomo Chemical Company Limited | Production method of a hydroxy compound |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0732083A (en) * | 1993-07-22 | 1995-02-03 | Nippon Polyurethane Ind Co Ltd | Molding material and production of casting mold |
| JPH09239487A (en) * | 1996-03-08 | 1997-09-16 | Daido Steel Co Ltd | Coating agent for vacuum casting |
| JPH105931A (en) * | 1996-06-24 | 1998-01-13 | Nissan Motor Co Ltd | Core for casting and its manufacture |
| WO1999041030A1 (en) * | 1998-02-11 | 1999-08-19 | Buntrock Industries | Investment casting mold and method of manufacture |
-
2001
- 2001-04-27 JP JP2001130673A patent/JP4528366B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0732083A (en) * | 1993-07-22 | 1995-02-03 | Nippon Polyurethane Ind Co Ltd | Molding material and production of casting mold |
| JPH09239487A (en) * | 1996-03-08 | 1997-09-16 | Daido Steel Co Ltd | Coating agent for vacuum casting |
| JPH105931A (en) * | 1996-06-24 | 1998-01-13 | Nissan Motor Co Ltd | Core for casting and its manufacture |
| WO1999041030A1 (en) * | 1998-02-11 | 1999-08-19 | Buntrock Industries | Investment casting mold and method of manufacture |
Cited By (12)
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|---|---|---|---|---|
| CN100418666C (en) * | 2006-11-24 | 2008-09-17 | 费长正 | Alcohol zircon flour coating for heavy castings and its production method |
| CN102328018A (en) * | 2011-10-28 | 2012-01-25 | 上海市机械制造工艺研究所有限公司 | Casting surface sulfur-seepage-prevention coating for furan resin sand mould |
| WO2016080132A1 (en) * | 2014-11-18 | 2016-05-26 | 株式会社神戸製鋼所 | Evaporative pattern casting method |
| TWI586455B (en) * | 2014-11-18 | 2017-06-11 | 神戶製鋼所股份有限公司 | Evaporative pattern casting method |
| KR20170070119A (en) * | 2014-11-18 | 2017-06-21 | 가부시키가이샤 고베 세이코쇼 | Evaporative pattern casting method |
| CN107107167A (en) * | 2014-11-18 | 2017-08-29 | 株式会社神户制钢所 | Lost-foam casting method |
| CN105108053A (en) * | 2015-09-28 | 2015-12-02 | 山东永和精密金属有限公司 | Primary layer coating for manufacturing shell of precision casting and preparation method of primary layer coating |
| CN105234344A (en) * | 2015-10-30 | 2016-01-13 | 高要市鸿兴精密铸造有限公司 | Cooling coating special for lost foam casting and preparation method of cooling coating |
| CN106391998A (en) * | 2016-12-02 | 2017-02-15 | 江麓机电集团有限公司 | Coating for sand mould low-pressure casting of aluminum alloy and preparation method thereof |
| CN113231599A (en) * | 2021-05-20 | 2021-08-10 | 云南太标精工铸造有限公司 | Casting coating capable of improving surface smoothness of casting |
| CN113231599B (en) * | 2021-05-20 | 2022-05-20 | 云南太标精工铸造有限公司 | Casting coating capable of improving surface smoothness of casting |
| CN114671700A (en) * | 2022-02-25 | 2022-06-28 | 广东省福美材料科学技术有限公司 | Modified inorganic powder composite facing sheet with decorative pattern and preparation method thereof |
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