JPH05123818A - Production of casting mold - Google Patents

Production of casting mold

Info

Publication number
JPH05123818A
JPH05123818A JP31538991A JP31538991A JPH05123818A JP H05123818 A JPH05123818 A JP H05123818A JP 31538991 A JP31538991 A JP 31538991A JP 31538991 A JP31538991 A JP 31538991A JP H05123818 A JPH05123818 A JP H05123818A
Authority
JP
Japan
Prior art keywords
binder
weight
parts
bisphenol
molding sand
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.)
Withdrawn
Application number
JP31538991A
Other languages
Japanese (ja)
Inventor
Yoshihiro Ashitani
純弘 芦谷
Minoru Matsunami
稔 松波
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Okazaki Minerals and Refining Co Ltd
Original Assignee
Okazaki Minerals and Refining Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Okazaki Minerals and Refining Co Ltd filed Critical Okazaki Minerals and Refining Co Ltd
Priority to JP31538991A priority Critical patent/JPH05123818A/en
Publication of JPH05123818A publication Critical patent/JPH05123818A/en
Withdrawn legal-status Critical Current

Links

Abstract

PURPOSE:To produce the casting mold so as to obtain sufficient strength even with a small amt. of a binder for molding sand and to improve the degree of freedom in selecting the raw materials for this binder even when bisphenol is used for the binder in the production of the casting mold. CONSTITUTION:An aq. soln. of the binder for the molding sand contg. 30 to 70wt.% potassium alkaline type, bisphenol/phenol 100 pts.wt. molding sand and lower org. acid ester is mixed as a hardener therewith at 10 to 50 pts.wt. per 100 pts.wt. binder mentioned above and the mixture is molded to a prescribed shape. The molding is then cured at ordinary temp. The content of the potassium alkaline type bisphenol A unit in the potassium alkaline type bisphenol/phenol copolymer wt. even at the time of compounding the above- mentioned resol resin at the max. ratio with 100 pts.wt. molding sand.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、鋳物砂を用いた鋳型
の製造方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a mold using foundry sand.

【0002】[0002]

【従来の技術】鋳型を製造する際における鋳物砂用粘結
剤には、第1に、常温硬化型としてフラン樹脂、フェノ
ール樹脂、もしくはポリウレタン樹脂などを用いる有機
性粘結剤が知られている。上記樹脂のうち、フラン樹脂
やフェノール樹脂は鋳型を容易に崩壊させることができ
ると共に、砂の回収が容易にできるという利点を有して
いるが、その反面、硬化触媒に有機スルホン酸もしくは
硫酸を用いるために、鋳物に悪影響を及ぼすおそれがあ
る。一方、ポリウレタン樹脂を用いるものでは、常温硬
化性が低く、また、耐熱性などに問題がある。そこで、
上記のような問題を解消するために、カリウムアルカリ
性フェノール・ホルムアルデヒド樹脂を用いて鋳物砂用
粘結剤を製造することが提案されている(例えば、特開
昭58‐154433号公報)。また、第2に、アルカ
リレゾール型ビスフェノール樹脂30〜70重量%を含
む鋳物砂用粘結剤が提案されていて(特公平3‐462
13号公報)、これを鋳型の製造に用いれば、少量の鋳
物砂用粘結剤で鋳型に十分の強度が得られ、また、樹脂
組成物の粘度の経時変化が少なく、耐湿性に優れた鋳型
を得ることができるとしている。
2. Description of the Related Art First of all, as a binder for foundry sand in the production of a mold, an organic binder using a furan resin, a phenol resin, a polyurethane resin or the like as a room temperature curing type is known. .. Of the above resins, furan resin and phenol resin have the advantage that the mold can be easily collapsed and sand can be easily recovered, but on the other hand, organic sulfonic acid or sulfuric acid is used as the curing catalyst. Since it is used, it may adversely affect the casting. On the other hand, the one using a polyurethane resin has low room temperature curability and has a problem in heat resistance. Therefore,
In order to solve the above problems, it has been proposed to produce a binder for foundry sand by using a potassium alkaline phenol-formaldehyde resin (for example, JP-A-58-154433). Secondly, a binder for foundry sand containing 30 to 70% by weight of an alkali resol type bisphenol resin has been proposed (Japanese Patent Publication No. 3-462).
No. 13 gazette), when this is used in the production of a mold, a sufficient amount of the binder for molding sand can be obtained in the mold, and the viscosity of the resin composition does not change with time and is excellent in moisture resistance. It is said that a mold can be obtained.

【0003】[0003]

【発明が解決しようとする課題】しかし、上記第1の鋳
物砂用粘結剤では、アルカリ触媒フェノール樹脂の特徴
としてメチロール基の含有量が多く、低分子量であるた
め、使用量を多くしないと鋳型の強度が不十分となる。
また、鋳物にガス欠陥を起こし易く、鋳込後の鋳型の崩
壊性、砂の回収性が悪いという問題がある。また、上記
第2のものにおけるアルカリレゾール型ビスフェノール
樹脂は、工業原料として市販されているものの種類が少
なく、粘結剤の原料選択の自由度が狭いという問題があ
る。
However, in the above first binder for foundry sand, since the content of the methylol group is large and the low molecular weight is a characteristic of the alkali-catalyzed phenol resin, the amount used must be increased. The strength of the mold becomes insufficient.
In addition, there is a problem that gas defects are likely to occur in the casting, the mold disintegration after casting and the sand recoverability are poor. In addition, the alkaline resole-type bisphenol resin in the above-mentioned second type has a problem that there are few kinds of commercially available products as industrial raw materials and the degree of freedom in selecting raw materials for the binder is narrow.

【0004】[0004]

【発明の目的】この発明は、上記のような事情に注目し
てなされたもので、上記従来の諸問題を解消し、特に、
少量の鋳物砂用粘結剤でも鋳型に十分の強度が得られる
ようにするとともに、鋳型の製造における粘結剤にビス
フェノール類を用いる場合において、この粘結剤の原料
選択の自由度を向上させることを目的とする。
SUMMARY OF THE INVENTION The present invention has been made paying attention to the above circumstances, and solves the above-mentioned problems of the prior art.
In order to obtain sufficient strength in the mold even with a small amount of binder for foundry sand, when using bisphenols as the binder in the production of the mold, improve the degree of freedom in selecting the raw material of this binder The purpose is to

【0005】[0005]

【課題を解決するための手段】上記目的を達成するため
のこの発明の特徴とするところは、鋳物砂100重量部
に対し、粘結剤であるカリウムアルカリ性ビスフェノー
ル・フェノール共重合型レゾール樹脂30〜70重量%
を含む鋳物砂用粘結剤水溶液0.5〜10重量部を混合
し、かつ、硬化剤として低級有機酸エステルを上記粘結
剤100重量部に対し、10〜50重量部混合して所定
形状に成形し、常温で硬化させる(但し、カリウムアル
カリ性ビスフェノール・フェノール共重合型レゾール樹
脂中のカリウムアルカリ性ビスフェノールA単位の含有
率は鋳物砂100重量部に対し、同上レゾール樹脂の最
大配合時においても、0.15重量部を越えないものと
する)点にある。
In order to achieve the above object, the present invention is characterized in that, with respect to 100 parts by weight of casting sand, 30 to 30 parts by weight of a potassium alkaline bisphenol / phenol copolymerization type resole resin which is a binder is used. 70% by weight
0.5 to 10 parts by weight of a binder sand aqueous solution for foundry sand containing 10 parts by weight of a lower organic acid ester as a curing agent is mixed with 100 parts by weight of the above binder to give a predetermined shape. And cured at room temperature (however, the content of the potassium alkaline bisphenol A unit in the potassium alkaline bisphenol / phenol copolymer type resole resin is 100 parts by weight of the molding sand, the same as above, even when the maximum amount of the resole resin is mixed, 0.15 parts by weight).

【0006】[0006]

【作 用】上記構成による作用は次の如くである。一般
に、強酸性条件下において、フェノール類は、アルデヒ
ドまたはケトンのようなカルボニル化合物との反応によ
り、下記化1を含む化2、もしくは化3を含む化4のよ
うな構造の共重合型ノボラック樹脂を与えるものと考え
られる。
[Operation] The operation of the above configuration is as follows. Generally, under strongly acidic conditions, phenols are reacted with a carbonyl compound such as an aldehyde or a ketone to give a copolymerized novolak resin having a structure such as Chemical formula 2 containing Chemical formula 1 or Chemical formula 4 containing Chemical formula 3 below. Is considered to give.

【0007】[0007]

【化1】 [Chemical 1]

【0008】[0008]

【化2】 [Chemical 2]

【0009】[0009]

【化3】 [Chemical 3]

【0010】[0010]

【化4】 [Chemical 4]

【0011】そして、上記反応における化学式は、次の
如くである。即ち、フェノールとアルデヒドとの反応に
おける化学式は、下記化5と化6とで示される。
The chemical formula in the above reaction is as follows. That is, the chemical formulas in the reaction between phenol and aldehyde are shown by the following chemical formulas 5 and 6.

【0012】[0012]

【化5】 [Chemical 5]

【0013】[0013]

【化6】 [Chemical 6]

【0014】また、フェノールとケトンとの反応におけ
る化学式は、下記化7と化8とで示される。
The chemical formulas in the reaction between phenol and ketone are represented by the following chemical formulas 7 and 8.

【0015】[0015]

【化7】 [Chemical 7]

【0016】[0016]

【化8】 [Chemical 8]

【0017】また、上記化1、化2、化3、もしくは化
4とホルムアルデヒドとを水酸化カリウムの存在下で
(カリウムアルカリ性条件下で)反応させると、共重合
型レゾール樹脂が得られるが、その反応における化学式
は、下記化9と化10とで示される。
When the above chemical formula 1, chemical formula 2, chemical formula 3, or chemical formula 4 is reacted with formaldehyde in the presence of potassium hydroxide (under potassium alkaline conditions), a copolymer type resole resin can be obtained. Chemical formulas in the reaction are represented by the following chemical formulas 9 and 10.

【0018】[0018]

【化9】 [Chemical 9]

【0019】[0019]

【化10】 [Chemical 10]

【0020】なお、上記各式中におけるR1 およびR2
は、水素およびメチル基以上のアルキル基、および脂環
式の基であり、よって、本発明で利用するビスフェノー
ルの種類は非常に多種類となる。
R 1 and R 2 in the above formulas
Are hydrogen, an alkyl group having a methyl or higher group, and an alicyclic group, and therefore, the types of bisphenols used in the present invention are extremely diverse.

【0021】[0021]

【実施例】鋳型の製造に際しては、鋳物砂100重量部
に対し、粘結剤であるカリウムアルカリ性ビスフェノー
ル・フェノール共重合型レゾール樹脂(以下、これを単
にレゾール樹脂という)30〜70重量%を含む鋳物砂
用粘結剤水溶液0.5〜10重量部を混合し、かつ、硬
化剤として低級有機酸エステルを上記粘結剤100重量
部に対し、10〜50重量部混合して所定形状に成形
し、常温で硬化させる。
[Examples] In the production of a mold, 30 to 70% by weight of a potassium alkaline bisphenol / phenol copolymer type resole resin (hereinafter, simply referred to as a resole resin), which is a binder, is added to 100 parts by weight of molding sand. 0.5 to 10 parts by weight of an aqueous binder solution for foundry sand is mixed, and 10 to 50 parts by weight of a lower organic acid ester as a curing agent is mixed with 100 parts by weight of the binder to form a predetermined shape. And cure at room temperature.

【0022】上記の場合、レゾール樹脂を30〜70重
量%としたのは、30重量%未満にすると、鋳物砂に十
分の強度が得られないためであり、70重量%を越える
と、粘性が高くなり取扱い上難点が生じてくるためであ
る。
In the above case, the reason why the amount of the resole resin is 30 to 70% by weight is that if the amount is less than 30% by weight, sufficient strength cannot be obtained in the foundry sand, and if it exceeds 70% by weight, the viscosity becomes high. The reason for this is that it becomes high and handling problems arise.

【0023】また、粘結剤水溶液を0.5〜10重量部
としたのは、0.5重量部未満であると、鋳物砂に十分
の強度が得られないためであり、10重量部を越える
と、鋳物砂の強度が大きくなり過ぎて、その回収がしに
くくなり、また、経済性が悪くなるためである。
Further, the reason why the binder aqueous solution is 0.5 to 10 parts by weight is that if the amount is less than 0.5 parts by weight, sufficient strength cannot be obtained in the foundry sand, and 10 parts by weight is added. This is because if it exceeds, the strength of the foundry sand becomes too large, and it becomes difficult to recover the sand, and the economical efficiency deteriorates.

【0024】更に、上記低級有機酸エステルを10〜5
0重量部としたのは、10重量部未満であると、硬化性
が悪くなるためであり、50重量部を越えると、硬化速
度が調節しにくくなり、また、経済性が悪くなるためで
ある。
Further, 10 to 5 of the above lower organic acid ester is added.
The amount of 0 parts by weight is because if it is less than 10 parts by weight, the curability is deteriorated, and if it exceeds 50 parts by weight, the curing rate is difficult to control and the economical efficiency is deteriorated. ..

【0025】また、前記したレゾール樹脂中のカリウム
アルカリ性ビスフェノールA単位の含有率は鋳物砂10
0重量部に対し、同上レゾール樹脂の最大配合時におい
ても、0.15重量部を越えないものとする。つまり、
レゾール樹脂を必要最小限に抑えるためである。
The content of the potassium alkaline bisphenol A unit in the above-mentioned resol resin is 10
The same amount as 0 part by weight does not exceed 0.15 part by weight even at the maximum compounding of the resole resin. That is,
This is to keep the resol resin to a necessary minimum.

【0026】上記の場合、粘結剤は次のようにして製造
することが好ましい。即ち、酸性条件下で、フェノール
(1モル)に対しアルデヒドまたはケトンなどのカルボ
ニル化合物(0.1モル〜0.7モル)、あるいはこれ
らの混合物を反応せしめて、ビスフェノール単位を含む
共重合型ノボラック樹脂を製造し、これにホルムアルデ
ヒド(最初のフェノール1モルに対し0.5モル〜2モ
ル)と、反応系を充分に強アルカリ性に保つ量の水酸化
カリウムを加えて加熱し、カリウムアルカリ性ビスフェ
ノール・フェノール共重合型レゾール樹脂水溶液を得、
更に硬化剤としての低級有機酸エステルを混合する。
In the above case, the binder is preferably produced as follows. That is, under acidic conditions, a carbonyl compound (0.1 mol to 0.7 mol) such as an aldehyde or a ketone or a mixture thereof is reacted with phenol (1 mol) to prepare a copolymer type novolak containing a bisphenol unit. A resin is produced, and formaldehyde (0.5 mol to 2 mol per mol of the initial phenol) and an amount of potassium hydroxide that keeps the reaction system sufficiently strong alkaline are added thereto and heated to give potassium alkaline bisphenol. Obtaining a phenol copolymer type resol resin aqueous solution,
Further, a lower organic acid ester as a curing agent is mixed.

【0027】次に、実験例を示す。なお、下記第1〜第
4実験例は、本発明に用いられる粘結剤の製造方法に関
するものである。また、第5実験例は、上記粘結剤のう
ち第3実験例で得られたものを用いた鋳型の製造方法に
関するものである。 (第1実験例)フェノール2Kg(21.27モル)、
37%(重量%、以下同じとする。)塩酸2.7Kg、
水1.3Kgを混合し、かき混ぜながら292gの37
%ホルマリン(108g、3.6モルのホルムアルデヒ
ドに相当する)を1時間かけて滴下する。この間25〜
30℃に維持する。かき混ぜを停止し、更に混合物を
1.5時間放置し、反応によって生成した上部の油層を
分離する。下部の水槽は再使用する。生成した油層は約
1Kgでその中にビスフェノールF(4.4′‐メチレ
ンジフェノール)、沸点170〜210℃/0.5mm
Hg、融点156〜158℃を含んでいる。この油層1
Kgに水2Kgと水酸化カリウム1.2Kg(21.4
モル)を加え、かき混ぜながら91%パラホルムアルデ
ヒド700g(ホルムアルデヒドとして21.26モ
ル)を徐々に添加し、80〜85℃に維持し粘度が15
0cp(20℃)に達するまで反応を継続したのち冷却
し、0.5%のγ‐アミノプロピルトリエトキシシラン
を加えて樹脂分55%の粘結剤を得た。
Next, an experimental example will be shown. In addition, the following 1st-4th experimental examples are related with the manufacturing method of the binder used for this invention. The fifth experimental example relates to a method for producing a mold using the binder obtained in the third experimental example among the binders. (First Experimental Example) 2 kg of phenol (21.27 mol),
37% (wt%, the same applies hereinafter) hydrochloric acid 2.7 Kg,
Mix 1.3 kg of water and stir 292 g of 37
% Formalin (corresponding to 108 g, 3.6 mol formaldehyde) is added dropwise over 1 hour. 25 ~
Maintain at 30 ° C. Stirring is stopped and the mixture is left for a further 1.5 hours to separate the upper oil layer produced by the reaction. The lower water tank will be reused. The oil layer produced was about 1 kg and contained bisphenol F (4.4'-methylenediphenol), boiling point 170-210 ° C / 0.5 mm.
It contains Hg and a melting point of 156 to 158 ° C. This oil layer 1
2 kg of water and 1.2 kg of potassium hydroxide (21.4 kg
700 g of 91% paraformaldehyde (21.26 mol as formaldehyde) was gradually added while stirring, and the viscosity was maintained at 80 to 85 ° C.
The reaction was continued until it reached 0 cp (20 ° C.) and then cooled, and 0.5% γ-aminopropyltriethoxysilane was added to obtain a binder having a resin content of 55%.

【0028】(第2実験例)36.5%の塩酸775g
とフェノール790g(8.4モル)に232gのアセ
トン(4モル)を混合した系に、8.4gのn‐オクチ
ルメルカプタンを加え、40℃で1時間かき混ぜたのち
50℃まで上昇させ、更に4時間かき混ぜる。この間に
反応系の色は淡黄色→黄色→黄褐色→橙色と変化する。
反応混合物を水酸化カリウム水溶液で中和(pH=7)
したのち、更に水酸化カリウム300gを加え、かき混
ぜながら92%パラホルムアルデヒド330g(ホルム
アルデヒドとして10.1モル)を徐々に添加し95℃
に加熱、粘度が100cp(20℃)に達する迄反応を
継続し、カリウムアルカリ性ビスフェノール・フェノー
ル共重合型レゾール樹脂水溶液を製造した。60℃に冷
却後0.5%のグリシドキシプロピルメトキシシランを
加え、樹脂分50%の粘結剤を得た。
(Second Experimental Example) 775 g of 36.5% hydrochloric acid
To a system in which 790 g (8.4 mol) of phenol and 232 g of acetone (4 mol) were mixed with 790 g (8.4 mol), 8.4 g of n-octyl mercaptan was added, and the mixture was stirred at 40 ° C for 1 hour and then heated to 50 ° C. Stir for hours. During this time, the color of the reaction system changes from pale yellow to yellow to tan to orange.
Neutralize the reaction mixture with aqueous potassium hydroxide (pH = 7)
After that, 300 g of potassium hydroxide was further added, and 330 g of 92% paraformaldehyde (10.1 mol as formaldehyde) was gradually added with stirring to 95 ° C.
Then, the reaction was continued until the viscosity reached 100 cp (20 ° C.) to prepare a potassium alkaline bisphenol / phenol copolymer type resol resin aqueous solution. After cooling to 60 ° C., 0.5% glycidoxypropylmethoxysilane was added to obtain a binder having a resin content of 50%.

【0029】(第3実験例)フェノール226g(2.
4モル)、アセトン35g(0.6モル)、濃塩酸(比
重=1.18)25gを混合する。かき混ぜながら、4
0℃で24時間保持する。反応溶液の色は時間と共に淡
黄色→黄色→黄褐色→橙色と変化する。反応開始後、約
10時間で細かい白色の針状結晶(ビスフェノールA、
融点155‐156℃)が析出し始め、次第に増加す
る。反応系を水酸化カリウム水溶液で中和(pH=7)
したのち、更に水酸化カリウム110gと、92%パラ
ホルムアルデヒド82gを徐々に加え、95℃に加熱
し、粘度が100cp(20℃)に達する迄反応を継続
し、カリウムアルカリ性ビスフェノール・フェノール共
重合型レゾール樹脂水溶液を製造した。60℃に冷却
後、0.5%のグリシドキシプロピルトリメトキシシラ
ンを加え、樹脂分50%の粘結剤を得た。
(Third Experimental Example) 226 g of phenol (2.
4 mol), 35 g (0.6 mol) of acetone, and 25 g of concentrated hydrochloric acid (specific gravity = 1.18) are mixed. While stirring, 4
Hold at 0 ° C for 24 hours. The color of the reaction solution changes from light yellow to yellow to tan to orange with time. About 10 hours after the start of the reaction, fine white needle-like crystals (bisphenol A,
Melting point 155-156 ° C) begins to precipitate and gradually increases. Neutralize reaction system with aqueous potassium hydroxide (pH = 7)
After that, 110 g of potassium hydroxide and 82 g of 92% paraformaldehyde were gradually added, heated to 95 ° C., and the reaction was continued until the viscosity reached 100 cp (20 ° C.). An aqueous resin solution was prepared. After cooling to 60 ° C., 0.5% glycidoxypropyltrimethoxysilane was added to obtain a binder having a resin content of 50%.

【0030】(第4実験例)フェノール226g(2.
4モル)、メチルエチルケトン37g(0.6モル)、
濃塩酸(比重=1.18)25gを混合する。第3実験
例と同様に処理すると、融点125℃の4.4′‐ジヒ
ドロキシ‐ジフエニル‐2.2‐ブタンを含む共重合型
ノボラック樹脂が得られる。反応系を水酸化カリウムで
中和し、第3実験例と同様に処理する。
(Fourth Experimental Example) 226 g of phenol (2.
4 mol), 37 g of methyl ethyl ketone (0.6 mol),
25 g of concentrated hydrochloric acid (specific gravity = 1.18) are mixed. When treated in the same manner as in Example 3, a copolymer type novolak resin containing 4.4'-dihydroxy-diphenyl-2.2-butane having a melting point of 125 ° C is obtained. The reaction system is neutralized with potassium hydroxide and treated in the same manner as in the third experimental example.

【0031】(第5実験例)珪砂(フリーマントル新
砂)100重量部に対し、硬化剤のトリアセチンを0.
6重量部加えて攪拌機で十分混合したのち、前記第3実
験例の粘結剤2重量部を加え混合した。この混合砂を直
径50mm×長さ50mmの試験片に成形して強度試験
を実施した。経時的な圧縮強度を、市販の標準的カリウ
ムアルカリレゾール樹脂を用いた粘結剤によるもの(比
較例)と同条件で比較した。結果を表1に示した。
(Fifth Experimental Example) With respect to 100 parts by weight of silica sand (Fremantle fresh sand), triacetin as a hardening agent was added to 0.1 part by weight.
After adding 6 parts by weight and thoroughly mixing with a stirrer, 2 parts by weight of the binder of the third experimental example was added and mixed. This mixed sand was molded into a test piece having a diameter of 50 mm and a length of 50 mm, and a strength test was performed. The compressive strength over time was compared under the same conditions as those of a binder using a commercially available standard potassium alkaline resole resin (Comparative Example). The results are shown in Table 1.

【0032】[0032]

【表1】 [Table 1]

【0033】上記表1によれば、本発明の鋳物砂用粘結
剤による試験片は、24時間経過後において明らかに市
販の標準的カリウムアルカリレゾール樹脂を用いた粘結
剤による試験片にまさっており、よって、本発明によれ
ば、鋳型に十分の強度を与えることが理解される。
According to Table 1 above, the test piece with the binder for foundry sand of the present invention is clearly superior to the test piece with the binder using the commercially available standard potassium alkaline resole resin after 24 hours. It is therefore understood that according to the invention, the mold is given sufficient strength.

【0034】[0034]

【発明の効果】この発明によれば、特に少量の鋳物砂用
粘結剤でも鋳型に十分の強度が得られることとなる。ま
た、鋳型の製造における粘結剤にビスフェノールを用い
る場合に、これを多種類のビスフェノールのうちから選
択でき、つまり、粘結剤の原料選択の自由度が向上する
という効果がある。
According to the present invention, it is possible to obtain sufficient strength in a mold even with a small amount of a binder for foundry sand. In addition, when bisphenol is used as the binder in the production of the mold, this can be selected from among many kinds of bisphenols, that is, there is an effect that the degree of freedom in selecting the raw material of the binder is improved.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 鋳物砂100重量部に対し、粘結剤であ
るカリウムアルカリ性ビスフェノール・フェノール共重
合型レゾール樹脂30〜70重量%を含む鋳物砂用粘結
剤水溶液0.5〜10重量部を混合し、かつ、硬化剤と
して低級有機酸エステルを上記粘結剤100重量部に対
し、10〜50重量部混合して所定形状に成形し、常温
で硬化させることを特徴とする鋳型の製造方法(但し、
カリウムアルカリ性ビスフェノール・フェノール共重合
型レゾール樹脂中のカリウムアルカリ性ビスフェノール
A単位の含有率は鋳物砂100重量部に対し、同上レゾ
ール樹脂の最大配合時においても、0.15重量部を越
えないものとする)。
1. 0.5 to 10 parts by weight of an aqueous binder solution for molding sand containing 30 to 70% by weight of a potassium alkaline bisphenol / phenol copolymerization type resole resin as a binder to 100 parts by weight of molding sand. A method for producing a mold, which comprises mixing 10 to 50 parts by weight of a lower organic acid ester as a curing agent with 100 parts by weight of the above-mentioned binder to form a predetermined shape and curing at room temperature. (However,
The content of the potassium alkaline bisphenol A unit in the potassium alkaline bisphenol-phenol copolymer type resol resin shall not exceed 0.15 part by weight per 100 parts by weight of molding sand even when the same amount of the above resole resin is mixed. ).
JP31538991A 1991-11-01 1991-11-01 Production of casting mold Withdrawn JPH05123818A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP31538991A JPH05123818A (en) 1991-11-01 1991-11-01 Production of casting mold

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP31538991A JPH05123818A (en) 1991-11-01 1991-11-01 Production of casting mold

Publications (1)

Publication Number Publication Date
JPH05123818A true JPH05123818A (en) 1993-05-21

Family

ID=18064812

Family Applications (1)

Application Number Title Priority Date Filing Date
JP31538991A Withdrawn JPH05123818A (en) 1991-11-01 1991-11-01 Production of casting mold

Country Status (1)

Country Link
JP (1) JPH05123818A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5925691A (en) * 1993-01-05 1999-07-20 Kao Corporation Binder composition for mold and method for producing mold

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5925691A (en) * 1993-01-05 1999-07-20 Kao Corporation Binder composition for mold and method for producing mold

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