JPH07112592B2 - Hardener composition for mold - Google Patents
Hardener composition for moldInfo
- Publication number
- JPH07112592B2 JPH07112592B2 JP62184740A JP18474087A JPH07112592B2 JP H07112592 B2 JPH07112592 B2 JP H07112592B2 JP 62184740 A JP62184740 A JP 62184740A JP 18474087 A JP18474087 A JP 18474087A JP H07112592 B2 JPH07112592 B2 JP H07112592B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- curing
- resin
- agent composition
- curing agent
- 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〕 本発明は加熱硬化製造法に於て鋳型を製造する際に用い
られる硬化剤組成物に関するものである。更に詳しく
は、耐火性粒状骨材と酸硬化性樹脂との混合物を硬化さ
せるための加熱硬化鋳型用硬化剤組成物に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a curing agent composition used for producing a mold in a heat curing production method. More specifically, it relates to a curing agent composition for a heat curing mold for curing a mixture of a refractory granular aggregate and an acid curable resin.
従来、加熱硬化鋳型の製造法としては、耐火性粒状骨剤
にフェノールノボラック樹脂を被覆し、ヘキサメチレン
テトラミンを触媒として約300℃近辺で加熱硬化せしめ
る、所謂シェルモールド法がある。この加熱硬化法は設
備的に簡便であり、作業的に使用しやすい等の利点によ
り現在加熱硬化鋳型製造法としては最も多く使用されて
いる。然し乍ら、硬化時間が長く、硬化温度が高いた
め、金型の歪、鋳型の歪が多く、鋳型のバリ取り作業が
欠かせず、又、寸法精度も不充分であった。更に硬化温
度が高い事による作業環境の劣悪さ及びフェノール樹
脂、ヘキサメチレンテトラミンの熱分解臭気による作業
環境の汚染も著しく、これらの大幅な改善が望まれてい
た。Conventionally, as a method for producing a heat-curing mold, there is a so-called shell mold method in which a fire-resistant granular bone agent is coated with a phenol novolac resin and heat-cured at about 300 ° C. using hexamethylenetetramine as a catalyst. This heat-curing method is currently most widely used as a heat-curing mold manufacturing method because it is simple in terms of equipment and easy to use for work. However, since the curing time is long and the curing temperature is high, the mold distortion and the mold distortion are large, the mold deburring work is indispensable, and the dimensional accuracy is insufficient. Further, the work environment is poor due to the high curing temperature and the work environment is contaminated due to the thermal decomposition odor of the phenolic resin and hexamethylenetetramine, and a great improvement of these has been desired.
又、250℃近辺で、耐火性粒状骨材にフェノールレゾー
ル樹脂やフラン分の少ないフェノール又は尿素／ホルマ
リン変性フラン樹脂等の酸硬化性樹脂と、塩化アンモニ
ウム、ショウ酸等の硬化触媒を混じた混合物を加熱硬化
する所謂ホットボックス法がある。これは硬化時間もシ
ェルモールド法よりは短かく、温度による歪、寸法精度
や熱的作業環境の面でも改善されるが更に硬化時間の短
縮、鋳型の物性向上、作業環境の改善が望まれている。Further, at around 250 ° C, a mixture of a refractory granular aggregate and an acid-curing resin such as phenol-resole resin or a furan-rich phenol or urea / formalin-modified furan resin, and a curing catalyst such as ammonium chloride or oxalic acid. There is a so-called hot box method of heating and curing. The curing time is shorter than that of the shell mold method, and it is improved in terms of strain due to temperature, dimensional accuracy and thermal working environment, but further shortening of the curing time, improvement of physical properties of the mold, improvement of working environment are desired. There is.
本発明者らは上記問題点を解決すべく鋭意研究の結果、
特定の樹脂を含有する硬化剤により鋳型の初期強度を大
幅に向上せしめることを見出し本発明を完成するに到っ
た。As a result of earnest research to solve the above problems, the present inventors have
The inventors have found that a curing agent containing a specific resin can significantly improve the initial strength of a mold and have completed the present invention.
即ち、本発明は、耐火性粒状骨材と酸硬化性樹脂との混
合物を硬化させるための硬化剤組成物であって、強酸と
弱塩基の塩、極性溶媒、極性溶媒に可溶な天然及び／又
は合成樹脂よりなることを特徴とする加熱硬化鋳型用硬
化剤組成物を提供するものである。That is, the present invention is a curing agent composition for curing a mixture of a refractory granular aggregate and an acid-curable resin, which is a salt of a strong acid and a weak base, a polar solvent, and a natural solvent soluble in a polar solvent. And / or a hardener composition for a heat-curing mold, characterized by comprising a synthetic resin.
本発明において、天然樹脂及び合成樹脂としては、ロジ
ン、リグニン、ポリビニルアルコール、酢酸ビニル樹
脂、ブチラール樹脂、エポキシ樹脂、ウレタン樹脂、ケ
トン樹脂、ビニルエーテル樹脂等が使用される。特に上
記樹脂の重量平均分子量が適正な範囲、即ち300〜50,00
0の物は鋳型の初期強度が大幅に向上するので好まし
い。In the present invention, rosin, lignin, polyvinyl alcohol, vinyl acetate resin, butyral resin, epoxy resin, urethane resin, ketone resin, vinyl ether resin and the like are used as the natural resin and the synthetic resin. Particularly, the weight average molecular weight of the above resin is in an appropriate range, that is, 300 to 50,00.
No. 0 is preferable because the initial strength of the mold is significantly improved.
本発明の硬化剤組成物中の天然及び／又は合成樹脂の含
有量は３〜50重量％が好ましく、更に好ましくは５〜35
重量％である。The content of the natural and / or synthetic resin in the curing agent composition of the present invention is preferably 3 to 50% by weight, more preferably 5 to 35%.
% By weight.
本発明において、強酸と弱塩基の塩としては、塩酸、硫
酸、有機スルホン酸等の強酸の少なくとも１種と、銅、
鉄、アルミニウム、亜鉛等の弱塩基の少なくとも１種と
の塩を主成分とするものが好ましく使用される。In the present invention, as the salt of a strong acid and a weak base, at least one kind of strong acid such as hydrochloric acid, sulfuric acid and organic sulfonic acid, copper,
Those containing a salt with at least one of weak bases such as iron, aluminum and zinc as a main component are preferably used.
本発明の硬化剤組成物中の強酸と弱塩基の塩の含有量は
10〜60重量％が好ましく、更に好ましくは15〜50重量％
である。The contents of the strong acid and weak base salts in the curing agent composition of the present invention are
10 to 60% by weight is preferable, and 15 to 50% by weight is more preferable.
Is.
本発明において、極性溶媒としては、好ましくは水、メ
タノール、エタノール、イソプロピルアルコールが単独
あるいは組合せて使用される。In the present invention, as the polar solvent, water, methanol, ethanol and isopropyl alcohol are preferably used alone or in combination.
本発明の硬化剤組成物中の極性溶媒の含有量は５〜60重
量％が好ましく、更に好ましくは10〜50重量％である。The content of the polar solvent in the curing agent composition of the present invention is preferably 5 to 60% by weight, more preferably 10 to 50% by weight.
本発明における耐火性粒状骨材としては石英質を主成分
とする硅砂の他、ジルコン砂、クロマイト砂、オリビン
砂等が使用されるが特に限定されるものではない。As the refractory granular aggregate in the present invention, in addition to silica sand containing silica as a main component, zircon sand, chromite sand, olivine sand, etc. are used, but are not particularly limited.
本発明における酸硬化性樹脂としてはフルフリルアルコ
ール、フルフリルアルコール／ホルマリン、尿素／ホル
マリン、フェノール類／ホルマリン、メラミン／ホルマ
リンの少なくとも１種の共縮合物又は混合物乃至はフル
フリルアルコールとの混合物が主成分であるものが使用
される。この酸硬化性樹脂に溶剤、界面活性剤、シラン
カップリング剤等を含有させてもよく、本発明を特に制
限するものではない。Examples of the acid-curable resin in the present invention include furfuryl alcohol, furfuryl alcohol / formalin, urea / formalin, phenols / formalin, melamine / formalin at least one cocondensate or a mixture or a mixture with furfuryl alcohol. The one that is the main component is used. The acid-curable resin may contain a solvent, a surfactant, a silane coupling agent, etc., and the present invention is not particularly limited thereto.
以下、実施例をもって本発明の詳細を説明するが、本発
明はこれら実施例のみに限定されるものではない。Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited to these examples.
実施例１〜９、比較例１〜２ オーストラリア産フラタリー硅砂100重量部に表−１に
示す強酸と弱塩基の塩、極性溶媒及び極性溶媒に可溶な
天然及び／又は合成樹脂を含む硬化剤を0.45重量部、尿
素ホルマリン変性フラン樹脂を1.5重量部添加混合した
混合物を予め180℃に加熱した25×25×250m/mの金型に
加圧空気と共に吹き込んで充填し10秒間焼成して鋳型を
成型し、焼成後15秒後の鋳型曲げ強度を測定した。Examples 1 to 9 and Comparative Examples 1 to 2 Hardener containing 100 parts by weight of Australian flattery silica sand, salts of strong acids and weak bases shown in Table 1, polar solvents and natural and / or synthetic resins soluble in polar solvents 0.45 parts by weight and 1.5 parts by weight of urea-formalin-modified furan resin were added and mixed, and the mixture was blown with pressurized air into a mold of 25 × 25 × 250 m / m preheated to 180 ° C., and the mixture was baked for 10 seconds to obtain a mold. Was molded, and the bending strength of the mold was measured 15 seconds after firing.
結果を表−１に示す。The results are shown in Table-1.
Claims (3)
を硬化させるための硬化剤組成物であって、強酸と弱塩
基の塩、極性溶媒、極性溶媒に可溶な天然及び／又は合
成樹脂よりなることを特徴とする加熱硬化鋳型用硬化剤
組成物。1. A curing agent composition for curing a mixture of a refractory granular aggregate and an acid-curable resin, which comprises a salt of a strong acid and a weak base, a polar solvent and a natural solvent soluble in a polar solvent. Alternatively, a curing agent composition for a heat curing mold, characterized by comprising a synthetic resin.
〜50,000である特許請求の範囲第１項記載の鋳型用硬化
剤組成物。2. Natural and synthetic resins having a weight average molecular weight of 300.
The hardener composition for a mold according to claim 1, which is 50,000.
はイソプロピルアルコールである特許請求の範囲第１項
又は第２項記載の鋳型用硬化剤組成物。3. The curing agent composition for a mold according to claim 1 or 2, wherein the polar solvent is water, methanol, ethanol or isopropyl alcohol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62184740A JPH07112592B2 (en) | 1987-07-24 | 1987-07-24 | Hardener composition for mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62184740A JPH07112592B2 (en) | 1987-07-24 | 1987-07-24 | Hardener composition for mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6431539A JPS6431539A (en) | 1989-02-01 |
| JPH07112592B2 true JPH07112592B2 (en) | 1995-12-06 |
Family
ID=16158527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62184740A Expired - Fee Related JPH07112592B2 (en) | 1987-07-24 | 1987-07-24 | Hardener composition for mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07112592B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999014003A1 (en) * | 1997-09-12 | 1999-03-25 | Kao Corporation | Acid-curable, refractory particulate material composition for forming mold |
-
1987
- 1987-07-24 JP JP62184740A patent/JPH07112592B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6431539A (en) | 1989-02-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| LAPS | Cancellation because of no payment of annual fees |