JPS594215B2 - Sand composition for molding - Google Patents
Sand composition for moldingInfo
- Publication number
- JPS594215B2 JPS594215B2 JP12849276A JP12849276A JPS594215B2 JP S594215 B2 JPS594215 B2 JP S594215B2 JP 12849276 A JP12849276 A JP 12849276A JP 12849276 A JP12849276 A JP 12849276A JP S594215 B2 JPS594215 B2 JP S594215B2
- Authority
- JP
- Japan
- Prior art keywords
- sand
- weight
- molding
- parts
- furan resin
- 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
Links
Landscapes
- Mold Materials And Core Materials (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
【発明の詳細な説明】
本発明はフラン樹脂を鋳型用粘結剤として使用するに当
り、新規な硬化用触媒を含有することを特徴とする鋳型
成型用砂組成物に関するものであ５ る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sand composition for molding, which is characterized in that it contains a novel curing catalyst when furan resin is used as a binder for molding.
一般にフラン樹脂は耐酸、耐アルカリ、耐溶剤性等の耐
化学薬品性にすぐれることがよく知られており、注型材
料、含浸材料、表面被覆材、樹脂セメント等として有用
である。In general, furan resins are well known to have excellent chemical resistance such as acid resistance, alkali resistance, and solvent resistance, and are useful as casting materials, impregnation materials, surface coating materials, resin cements, and the like.
１０また、耐熱性にもすぐれる利点より鋳型用粘結剤と
しても有用に供されていることは既知の通クである。10 It is also known that it is useful as a binder for molds due to its excellent heat resistance.
このフラン樹脂の硬化には硫酸、リン酸、過塩素酸、硝
酸等の無機プロトン酸、ベンゼンスルホ１５ン酸、トル
エンスルホン酸、キシレンスルホン酸の如き有機スルホ
ン酸系プロトン酸を触媒に使用して縮合反応により硬化
せしめるのが常法である。To cure this furan resin, inorganic protonic acids such as sulfuric acid, phosphoric acid, perchloric acid, and nitric acid, and organic sulfonic protonic acids such as benzenesulfonic acid, toluenesulfonic acid, and xylene sulfonic acid are used as catalysts. The conventional method is to cure by condensation reaction.
しかし、これらの無機、有機プロトン酸系触媒を使用す
るには種々の難点がある。２０硫酸は硬化速度の非常に
速い触媒として有用であるが、硫酸は取扱いが困難であ
り、型枠、配管等の腐食の問題が生じる。However, there are various difficulties in using these inorganic and organic protonic acid catalysts. Although sulfuric acid is useful as a catalyst with a very fast curing rate, sulfuric acid is difficult to handle and causes problems of corrosion of molds, piping, etc.
また、鋳造製品に対する硫黄の悪影響が生じる恐れがあ
り、酸として強力過ぎる結果、反応が部分的に進み均一
な鋳型を５ 製造しにくい等の難点がある。リン酸は取
扱いも容易で腐食等の難点も少く、鋳造製品に対する悪
影響も少く有用な硬化触媒であるが、鋳型内部の硬化が
均一でなく、吸湿性が高い結果、またフラン樹脂との相
溶性が低い結果３０鋳型強度がでにくいという難点があ
る。In addition, sulfur may have an adverse effect on cast products, and as a result of being too strong as an acid, the reaction progresses partially, making it difficult to manufacture uniform molds. Phosphoric acid is a useful curing catalyst because it is easy to handle, has few drawbacks such as corrosion, and has little negative impact on cast products, but it does not cure uniformly inside the mold, is highly hygroscopic, and has poor compatibility with furan resin. As a result of low mold strength, it is difficult to obtain mold strength.
過塩素酸、硝酸等は溶湯を注湯時に一・ロゲンガスやＮ
０ｘを発生するため現在では余り使用されていない。そ
れらに比較して有機スルホン酸系触媒はこれらの難点も
少く現在最も多く利用されている触媒であ３５るが、や
はり硫黄に起因する悪影響の恐れがある。本発明はこれ
ら難点を改良することを目的とした硬化用触媒を含む鋳
型成型用砂組成物に関するもので該硬化用触媒として一
般式〔但しＲは炭素数１〜８の分岐または直鎖のアルキ
ル基〕で示される化合物もしくはそれらの混合物でフラ
ン樹脂を硬化せしめる組成物に関するものである。When pouring molten metal, perchloric acid, nitric acid, etc.
It is not used much at present because it generates 0x. Compared to them, organic sulfonic acid catalysts have fewer of these drawbacks and are currently the most commonly used catalysts35, but they still have the risk of adverse effects due to sulfur. The present invention relates to a molding sand composition containing a curing catalyst with the aim of improving these drawbacks. This invention relates to a composition for curing a furan resin with a compound represented by the following group or a mixture thereof.
本発明に使用されるフラン樹脂としては従来公知の方法
、例えば特公昭３９−１５４３号公報、同３９−１９７
０１号公報等に記載された方法により製造されるフラン
樹脂であるが、通常市販のフラン樹脂で充分であり、特
にこれに限定されるものではない。また、使用される砂
としても一般に鋳型用砂として用いられるシリカ分の多
い所謂シリカサンドやクロマイト砂が適当であり特に砂
に限定されるものではない。The furan resin used in the present invention can be prepared by conventionally known methods such as Japanese Patent Publication No. 39-1543 and Japanese Patent Publication No. 39-197.
Although the furan resin is produced by the method described in Publication No. 01, etc., commercially available furan resins are usually sufficient, and the present invention is not particularly limited thereto. In addition, the sand used is not particularly limited to sand, but so-called silica sand or chromite sand with a high silica content, which is generally used as molding sand, is suitable.
本発明による硬化触媒を使用して鋳型成型用砂組成物を
提供するには、従来の常法に従つて、まず砂１００部（
重量基準、以下同じ）に対し該硬化触媒０．３〜３部を
混合し、次いでフラン樹脂０．６〜５部を混合して成型
するのが一般的であるが、この方法、順序に限定される
ものではない。To provide a molding sand composition using the curing catalyst according to the invention, first 100 parts of sand (
It is common to mix 0.3 to 3 parts of the curing catalyst and then mix 0.6 to 5 parts of the furan resin and mold, but this method and order are limited. It is not something that will be done.
混合、成型、硬化温度としても特に加熱、冷却の必要は
なく、雰囲気温度により使用して差しさわりはない。ま
た本発明の硬化触媒を使用するに際し、例えば硬化を促
進するための添加剤や鋳物製品の不良を減少させ得る従
来公知の添加剤の使用は一向に差しさわりなく本発明の
範囲に含まれるものである。There is no particular need for heating or cooling for mixing, molding, and curing temperatures, and there is no problem in using it at any ambient temperature. Furthermore, when using the curing catalyst of the present invention, the use of conventionally known additives, such as additives for accelerating curing and reducing defects in cast products, is within the scope of the present invention. be.
本発明による硬化触媒を用いてフラン樹脂を硬化せしめ
た鋳型成型用砂組成物は次の如くの特長を有する。The molding sand composition in which furan resin is cured using the curing catalyst according to the present invention has the following features.
１ 硬化するに際し、湿度の影響を受けにくい。1. Hardly affected by humidity during curing.
２ 充分に深部まで硬化せしめることができる。2. Can be hardened to a sufficient depth.
３ 硫黄に起因する弊害を無視できる。3. The harmful effects caused by sulfur can be ignored.
以下に本発明を実施例により詳細に述べるが以下実施例
は本発明をより詳細に説明するもので、この実施例によ
り本発明を限定するものではない。EXAMPLES The present invention will be described in more detail with reference to Examples below, but the Examples are intended to explain the present invention in more detail, and the present invention is not limited to these Examples.
実施例 １鋳物成型用砂組成物は以下により提供された
。Example 1 A foundry sand composition was provided as follows.
硅砂（掛津ＫＦ−５号）１００重量部、特公昭３９−１
５４３号公報に記載された方法により得たフラン樹脂１
．５重量部、酸性リン酸メチル（このものはリン酸モノ
メチル５０重量％とリン酸ジメチル５０重量％との混合
物である。）１．０重量部を用いて砂温２５℃、気温２
５℃、湿度６５％Ｒ．Ｈ．にて混合、硬化せられた。こ
のものは抗圧力で３９Ｋｆ／Ｃｄであつた。尚、酸性リ
ン酸メチルの代りに、８５％リン酸０．８重量部とメタ
ノール０．３重量部から成る混合物を用いた場合の抗圧
力は１８Ｋ９／Ｃｄであつた。100 parts by weight of silica sand (Kaketsu KF-5)
Furan resin 1 obtained by the method described in Publication No. 543
．． Using 5 parts by weight and 1.0 parts by weight of acidic methyl phosphate (this is a mixture of 50% by weight of monomethyl phosphate and 50% by weight of dimethyl phosphate), the sand temperature was 25°C and the air temperature was 2.
5℃, humidity 65%R. H. Mixed and cured. This product had a counter pressure of 39 Kf/Cd. Note that when a mixture of 0.8 parts by weight of 85% phosphoric acid and 0.3 parts by weight of methanol was used instead of acidic methyl phosphate, the coercive pressure was 18K9/Cd.
実施例 ２硅砂（オーストラリア産フラタリーサンド）
１００重量部、フラン樹脂１．５重量音臥酸性リン酸モ
ノイソプロピル１．０重量部を使用した他は実施例１と
同様にして硬化せられた。Example 2 Silica sand (Australian flattery sand)
Curing was carried out in the same manner as in Example 1, except that 100 parts by weight of the furan resin, 1.5 parts by weight of the furan resin, and 1.0 parts by weight of monoisopropyl acidic acid phosphate were used.
このものは４３Ｋｆ／Ｃｒｌの抗圧力であつた。This had a counter pressure of 43 Kf/Crl.
実施例 ３湿度による硬化の影響を調べるため砂温及び
気温２５℃に於て湿度１００％Ｒ．Ｈ．にて硬化させた
。Example 3 In order to investigate the influence of humidity on curing, sand temperature and air temperature were 25°C and humidity was 100%R. H. It was cured.
硅砂１００重量部、フラン樹脂２．０重量部、リン酸ジ
エチル１．０重量部及び参考例として８５％リン酸（市
販試薬）１．０重量部を使用して硬化せしめた例を共に
示す。An example of curing using 100 parts by weight of silica sand, 2.0 parts by weight of furan resin, 1.0 parts by weight of diethyl phosphate, and 1.0 parts by weight of 85% phosphoric acid (commercially available reagent) as a reference example is also shown.
本発明による硬化触媒を使用すると高湿度条件下にても
充分硬化をするが、従来公知のリン酸を触媒として使用
すると充分に硬化しなかつた。When the curing catalyst according to the present invention is used, sufficient curing is achieved even under high humidity conditions, but when conventionally known phosphoric acid is used as a catalyst, sufficient curing is not achieved.
実施例 ４深部硬化を調べるために鋳型表面から一定距
離内部での引つかき硬度を測定した。Example 4 In order to examine deep hardening, the hardness was measured at a certain distance from the surface of the mold.
硅砂１００重量部、フラン樹脂２．０重量部、実施例１
で使用したと同じ酸性リン酸メチル０．７５重量部及び
参考例として５０（：Ｌ硫酸水溶液を硬化触媒として０
．７５重量部使用した場合の例を示す。100 parts by weight of silica sand, 2.0 parts by weight of furan resin, Example 1
As a reference example, 0.75 parts by weight of the same acidic methyl phosphate as used in
．． An example is shown in which 75 parts by weight is used.
Claims (1)
成物において、一般式▲数式、化学式、表等があります
▼ 〔但し、Ｒは炭素数１〜８の分岐もしくは直鎖のアルキ
ル基〕で示される化合物からなる触媒の１種又は２種以
上を含有することを特徴とする鋳型成型用砂組成物。 ２ 砂に対するフラン樹脂の量が０．６〜５重量％であ
る特許請求の範囲第１項記載の組成物。 ３ 砂に対する触媒の量が０．３〜３重量％である特許
請求の範囲第１項記載の組成物。 ４ 触媒が酸性リン酸メチルである特許請求の範囲第１
項記載の組成物。[Claims] 1. In the molding sand composition containing furan resin as a binder, there are general formulas ▲ mathematical formulas, chemical formulas, tables, etc. ▼ [However, R is branched or straight carbon number 1 to 8] A sand composition for molding, characterized in that it contains one or more catalysts consisting of a compound represented by the following alkyl group in the chain. 2. The composition according to claim 1, wherein the amount of furan resin based on the sand is 0.6 to 5% by weight. 3. The composition according to claim 1, wherein the amount of catalyst relative to the sand is 0.3 to 3% by weight. 4 Claim 1 in which the catalyst is acidic methyl phosphate
Compositions as described in Section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12849276A JPS594215B2 (en) | 1976-10-26 | 1976-10-26 | Sand composition for molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12849276A JPS594215B2 (en) | 1976-10-26 | 1976-10-26 | Sand composition for molding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5353517A JPS5353517A (en) | 1978-05-16 |
| JPS594215B2 true JPS594215B2 (en) | 1984-01-28 |
Family
ID=14986080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12849276A Expired JPS594215B2 (en) | 1976-10-26 | 1976-10-26 | Sand composition for molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS594215B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6910332B2 (en) * | 2018-11-26 | 2021-07-28 | 花王株式会社 | Binder composition for molding |
-
1976
- 1976-10-26 JP JP12849276A patent/JPS594215B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5353517A (en) | 1978-05-16 |
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