JPH0373378B2 - - Google Patents
Info
- Publication number
- JPH0373378B2 JPH0373378B2 JP59174443A JP17444384A JPH0373378B2 JP H0373378 B2 JPH0373378 B2 JP H0373378B2 JP 59174443 A JP59174443 A JP 59174443A JP 17444384 A JP17444384 A JP 17444384A JP H0373378 B2 JPH0373378 B2 JP H0373378B2
- Authority
- JP
- Japan
- Prior art keywords
- binder
- furfuryl alcohol
- mold
- molds
- aldehyde
- 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 - Lifetime
Links
- XPFVYQJUAUNWIW-UHFFFAOYSA-N furfuryl alcohol Chemical compound OCC1=CC=CO1 XPFVYQJUAUNWIW-UHFFFAOYSA-N 0.000 claims description 94
- 239000011230 binding agent Substances 0.000 claims description 37
- 238000004519 manufacturing process Methods 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 14
- 239000011347 resin Substances 0.000 claims description 12
- 229920005989 resin Polymers 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 11
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims description 10
- 239000007800 oxidant agent Substances 0.000 claims description 6
- 150000002978 peroxides Chemical class 0.000 claims description 4
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 3
- 125000003118 aryl group Chemical group 0.000 claims description 3
- 239000004202 carbamide Substances 0.000 claims description 3
- 239000007849 furan resin Substances 0.000 claims description 3
- 150000002989 phenols Chemical class 0.000 claims description 3
- 229920000877 Melamine resin Polymers 0.000 claims description 2
- 125000003172 aldehyde group Chemical group 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 11
- YLQBMQCUIZJEEH-UHFFFAOYSA-N Furan Chemical compound C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 8
- 239000004576 sand Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000000465 moulding Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000005266 casting Methods 0.000 description 6
- 239000008187 granular material Substances 0.000 description 6
- 238000010186 staining Methods 0.000 description 6
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 238000011109 contamination Methods 0.000 description 4
- 239000000443 aerosol Substances 0.000 description 3
- 238000010367 cloning Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- WFUGQJXVXHBTEM-UHFFFAOYSA-N 2-hydroperoxy-2-(2-hydroperoxybutan-2-ylperoxy)butane Chemical compound CCC(C)(OO)OOC(C)(CC)OO WFUGQJXVXHBTEM-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical group C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 150000002240 furans Chemical class 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 229920001228 polyisocyanate Polymers 0.000 description 1
- 239000005056 polyisocyanate Substances 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000003512 tertiary amines Chemical class 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
- B22C1/22—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins
- B22C1/2233—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- B22C1/224—Furan polymers
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
〔産業上の利用分野〕
本発明はガス硬化性鋳型用粘結剤組成物に関す
るものである。更に詳しくは、本発明は耐火性粒
状物に酸硬化性樹脂と酸化剤を添加混練し、型枠
に成型後ガス状又はエロゾル状の二酸化硫黄を注
入して鋳型を製造する所謂酸硬化性コールドボツ
クスに使用する改良された粘結剤組成物に関する
ものである。
〔従来の技術〕
従来、中、高速で鋳型を製造するにはフエノー
ル樹脂を粒状耐火物に被覆した所謂コーテツドサ
ンドを加熱硬化して鋳型を製造するクローニング
法が巾広く使用されている。
しかし鋳型製造時の省エネルギー、鋳型生産速
度、更に鋳型、鋳物の品質を改善するため、ガス
状又はエロゾル状物質で常温硬化させるコールド
ボツクス鋳型製造法が、クローニング法を代替す
る鋳型の製造法として鋳物業界で真剣に導入が試
みられて来ている。
コールドボツクス法にはフラン系樹脂を代表と
する酸硬化性樹脂を過酸化物を酸化剤として二酸
化硫黄により硬化させる酸硬化コールドボツクス
と、ポリオールとポリイソシアネートとをエロゾ
ル状の第３級アミンを触媒として硬化するウレタ
ンコールドボツクスがある。
この中ウレタンコールドボツクスを使用した鋳
型は、鋳物製造法の鋳砂の崩壊性が悪いとか、砂
かみ、すくわれ、ピンホール、すす欠陥等の鋳造
欠陥が発生しやすい等の欠点がある。
それに対して酸硬化コールドボツクスは前記の
難点を解決する方法として近年急速に注目を集め
ている。
〔発明が解決しようとする問題点〕
本発明はこの酸硬化コールドボツクスの鋳型生
産性を改良するに適した粘結剤組成物に関するも
のである。
即ち酸硬化性コールドボツクス鋳型は鋳型製造
時省エネルギーである、鋳型製造速度が速い、製
造された鋳型の品質、鋳物の品質が優れる等、従
来のクローニング法、ウレタンコールドボツクス
よりも優れた特徴を数々有するが、改善すべき課
題も又有する。
その課題の一つは鋳型製造用模型の汚染所謂し
みつきがある。しみつきとは耐火性粒状物に添加
混練し被覆された液状粘結剤組成物が鋳型成型時
に粒状物同志の衝突、硬化ガスや余剰の硬化ガス
洗浄用の加圧空気等の流体により粒状物表面から
剥離等され、模型表面に付着し、同一模型で繰返
し鋳型製造するとこの付着が繰返されしみつきと
して積層されるものである。このしみつきが発生
すると模型表面の平滑性が損なわれ、鋳型の表面
安定性を低下させる等、鋳型の品質に悪影響を及
ぼしたり、このしみつき除去のための清掃時間を
要する等生産性を阻害する要因となる。
本発明はこのしみつきを低減し又除去を容易に
する粘結剤組成物に関するものである。
本発明者らは鋭意研究の結果、粘結剤中フルフ
リルアルコール含有量を低減した粘結剤によりこ
のしみつきを低減し又除去を容易にする事を可能
ならしめたものである。
即ち、従来、酸硬化性樹脂を粘結剤とし常温で
燐酸、硫酸、有機スルホン酸等を触媒として鋳型
を製造する所謂自硬性では鋳型及び、鋳物品質の
点でフラン系樹脂が多用されて居り、本発明に係
る酸硬化性コールドボツクスでも同様フラン系樹
脂を多用する。然るに従来のフラン系樹脂はフル
フリルアルコールを主原料とし且つ、フルフリル
アルコールを樹脂中の反応性溶剤として使用する
結果、主原料としたフルフリルアルコールが殆ん
どそのまま残存しているのが現状である。
〔問題点を解決するための手段〕
本発明者らは鋭意研究の結果、粘結剤中フルフ
リルアルコール含有量と模型汚染とに密接な関係
がある事を解明し、本発明に到つたものである。
即ち、フルフリルアルコールを主原料とするフ
ラン系樹脂を粘結剤とし、過酸化物を酸化剤とし
て二酸化硫黄により鋳型を成型するガス硬化性鋳
型製造法に用いられる鋳型用粘結剤組成物であつ
て、該フラン系樹脂がフルフリルアルコールを単
独で重縮合させるか、又はフエノール類、フエノ
ール類−アルデヒド重縮合物、尿素、尿素−アル
デヒド重縮合物、メラミン、メラミン−アルデヒ
ド重縮合物、ケトン−アルデヒド重縮合物、芳香
族炭化水素−アルデヒド重縮合物、一分子中に１
ケ以上のアルデヒド基を有する化合物の少なくと
も一種を混合乃至は共縮合せしめて粘結剤中のフ
ルフリルアルコール含有量を低減せしめたもので
あり、粘結剤中のフルフリルアルコール含有量が
30重量％以下であるか、あるいは粘結剤原料中フ
ルフリルアルコール含有量と粘結剤中フルフリル
アルコール含有量との比が１：0.6以下であるか
の少なくとも一方の条件を満足することを特徴と
する鋳型用粘結剤組成物により模型汚染を大巾に
減少せしめ、鋳型の生産性、鋳型の品質を大きく
向上させたものである。
本発明の粘結剤として好ましいものは、フルフ
リルアルコールを主原料とし、上記フエノール類
等の他の成分の少なくとも一種の混合乃至共縮合
せしめたものである。更に好ましいものは粘結剤
中フルフリルアルコール含有量が30重量％以下
で、且つ粘結剤原料中フルフリルアルコール含有
量と粘結剤中フルフリルアルコール含有量との比
が１：0.6以下のものである。
粘結剤中フルフリルアルコール含有量が30重量
％を越えると、模型表面にエントレインメントす
るフルフリルアルコールを減少できず、しみつき
を大幅に低減できない。
又粘結剤原料中フルフリルアルコール含有量と
粘結剤中フルフリルアルコール含有量との比が
１：0.6を越えると、模型表面にエントレインメ
ントするフルフリルアルコールを減少できず、し
みつきを大幅に低減できない。
又、本発明において、粘結剤組成物中に必要に
応じて粘性を調整するための溶剤、希釈剤を含有
せしめたり、鋳型の強度、耐湿性のためシランカ
ツプリング剤を含有させる等の公知の添加剤を含
有せしめることもできる。
本発明の粘結剤を使用して鋳型を製造する際の
耐火性粒状物としては酸化珪素を主成分とする硅
素の他、ジルコン砂、クロマイト砂等が使用され
る。酸化剤としてはメチルエチルケトン過酸化物
を主成分とする過酸化物組成物の他、脂肪族、芳
香族ハイドロ過酸化物組成物等が使用される。
通常粒状物100重量部に粘結剤0.5〜２重量部、
酸化剤0.2〜１重量部使用するが、これらにより
本発明を制限するものではない。
又、鋳型製造用模型としては、鉄、アルミ等の
金型、エポキシ、ウレタン等の樹脂型及び木型が
あるが、通常本用途の如き高速で大量に鋳型を製
造する分野では耐久性の点から金型を多く使用す
るがこれに限定されるものではない。
〔実施例〕
以下に本発明を更に詳細に説明するため実施例
を述べるが本実施例により本発明の範囲を制限す
るものではない。
実施例１〜10及び比較例１〜２
フルフリルアルコールとホルマリンを縮合さ
せ、原料中フルフリルアルコール含有量(A)と粘結
剤中フルフリルアルコール含有量(B)の比（Ａ／Ｂ
で表わす）が表１に記載のものを製造し、更にこ
のものに尿素／ホルマリン樹脂等表１に記載のも
のを添加混合した。
これら粘結剤を硅砂に対し1.2重量部、メチル
エチルケトン過酸化物0.5重量部混じ、水平割鋳
型自動造型機にて空気圧3.0Kg／cm2で混練砂を充
填した後二酸化硫黄ガスを注入し、余剰のガスを
加圧空気で洗浄して鋳型を成型した。
加圧空気と共に混練砂を注入する口（ブロー
口）の真下に１cm角の鉄板を帖着し、繰り返し
200回鋳型を成型した後鉄板を剥して汚染物の付
着量を測定した。
結果を表１に示す。
[Industrial Field of Application] The present invention relates to a gas-curable binder composition for molds. More specifically, the present invention is a so-called acid-curing cold method in which a mold is manufactured by adding and kneading an acid-curing resin and an oxidizing agent to refractory granules, molding the mixture into a mold, and then injecting gaseous or aerosol sulfur dioxide into the mold. This invention relates to an improved binder composition for use in boxes. [Prior Art] Conventionally, in order to manufacture molds at medium to high speeds, a cloning method has been widely used in which a mold is manufactured by heating and curing so-called coated sand in which granular refractories are coated with phenolic resin. However, in order to save energy during mold manufacturing, mold production speed, and improve the quality of molds and castings, the cold box mold manufacturing method, which hardens at room temperature using gaseous or aerosol substances, has been introduced as a mold manufacturing method that replaces the cloning method. Serious attempts are being made to introduce it in the industry. The cold box method involves curing acid-curing resins, typically furan-based resins, with sulfur dioxide using peroxide as an oxidizing agent, and curing polyols and polyisocyanates with an aerosol of tertiary amine as a catalyst. There is a urethane cold box that hardens as Among these, molds using urethane cold boxes have drawbacks such as poor disintegration of casting sand in the casting manufacturing process and the tendency to cause casting defects such as sand trapping, scooping, pinholes, and soot defects. On the other hand, acid-curing cold boxes have been rapidly attracting attention in recent years as a method for solving the above-mentioned difficulties. [Problems to be Solved by the Invention] The present invention relates to a binder composition suitable for improving the mold productivity of acid-cured cold boxes. In other words, acid-curing cold box molds have many advantages over conventional cloning methods and urethane cold box molds, such as energy savings during mold manufacturing, fast mold manufacturing speed, and superior quality of manufactured molds and castings. However, there are also issues that need improvement. One of the problems is contamination of the mold manufacturing model, so-called staining. Staining is caused by the liquid binder composition added to and kneaded into refractory granules and coated with them. During molding, the granules collide with each other during molding, and the granules are caused by hardening gas and fluids such as pressurized air for cleaning excess hardening gas. It peels off from the surface and adheres to the surface of the model, and when molds are repeatedly manufactured using the same model, this adhesion is repeated and a layer is formed as a stain. When this stain occurs, the smoothness of the model surface is impaired, which adversely affects the quality of the mold by reducing the surface stability of the mold, and the time required for cleaning to remove the stain impairs productivity. It becomes a factor. The present invention relates to a binder composition that reduces this staining and facilitates removal. As a result of extensive research, the present inventors have found that it is possible to reduce this staining and facilitate removal by using a binder with a reduced content of furfuryl alcohol in the binder. That is, conventionally, in the so-called self-hardening process where molds are manufactured using acid-curing resin as a binder and phosphoric acid, sulfuric acid, organic sulfonic acid, etc. as a catalyst at room temperature, furan-based resins have been frequently used in terms of mold quality and casting quality. Similarly, the acid-curable cold box according to the present invention also uses a large amount of furan-based resin. However, conventional furan-based resins use furfuryl alcohol as the main raw material, and as a result of using furfuryl alcohol as a reactive solvent in the resin, the current situation is that most of the furfuryl alcohol, which is the main raw material, remains intact. It is. [Means for solving the problem] As a result of intensive research, the present inventors have discovered that there is a close relationship between the furfuryl alcohol content in the binder and model contamination, leading to the present invention. It is. That is, it is a mold binder composition used in a gas-curable mold manufacturing method in which a mold is formed using sulfur dioxide using furfuryl alcohol as the main raw material and furanic resin as a binder and peroxide as an oxidizing agent. If the furan resin is polycondensed with furfuryl alcohol alone, or phenols, phenol-aldehyde polycondensates, urea, urea-aldehyde polycondensates, melamine, melamine-aldehyde polycondensates, ketones -Aldehyde polycondensate, aromatic hydrocarbon-aldehyde polycondensate, 1 per molecule
The content of furfuryl alcohol in the binder is reduced by mixing or co-condensing at least one compound having at least one aldehyde group.
30% by weight or less, or the ratio of the furfuryl alcohol content in the binder raw material to the furfuryl alcohol content in the binder is 1:0.6 or less. The characteristic binder composition for molds greatly reduces mold contamination and significantly improves mold productivity and mold quality. A preferable binder for the present invention is one made of furfuryl alcohol as a main raw material and mixed with or co-condensed with at least one of the other components such as the above-mentioned phenols. More preferably, the furfuryl alcohol content in the binder is 30% by weight or less, and the ratio of the furfuryl alcohol content in the binder raw material to the furfuryl alcohol content in the binder is 1:0.6 or less. It is something. If the furfuryl alcohol content in the binder exceeds 30% by weight, furfuryl alcohol entraining on the model surface cannot be reduced, and staining cannot be significantly reduced. Furthermore, if the ratio of the furfuryl alcohol content in the binder raw material to the furfuryl alcohol content in the binder exceeds 1:0.6, it will not be possible to reduce the furfuryl alcohol entraining on the model surface, resulting in significant staining. cannot be reduced to In addition, in the present invention, the binder composition may contain a solvent or a diluent to adjust the viscosity as necessary, or may contain a silane coupling agent to improve mold strength and moisture resistance. It is also possible to contain additives. When producing a mold using the binder of the present invention, the refractory granules used include silicon whose main component is silicon oxide, as well as zircon sand, chromite sand, and the like. As the oxidizing agent, in addition to peroxide compositions containing methyl ethyl ketone peroxide as a main component, aliphatic and aromatic hydroperoxide compositions are used. Usually 0.5 to 2 parts by weight of binder to 100 parts by weight of granules,
Although 0.2 to 1 part by weight of the oxidizing agent is used, the present invention is not limited thereto. In addition, mold manufacturing models include metal molds such as iron and aluminum molds, resin molds such as epoxy and urethane molds, and wooden molds, but in the field where molds are manufactured in large quantities at high speed such as this purpose, durability is usually important. Although many molds are used, it is not limited to this. [Examples] Examples will be described below to explain the present invention in more detail, but the scope of the present invention is not limited by these Examples. Examples 1 to 10 and Comparative Examples 1 to 2 Furfuryl alcohol and formalin were condensed and the ratio of furfuryl alcohol content (A) in the raw material to furfuryl alcohol content (B) in the binder was determined (A/B).
(represented by ) shown in Table 1 were produced, and further, urea/formalin resin, etc. shown in Table 1 were added and mixed. These binders were mixed with 1.2 parts by weight of silica sand and 0.5 parts by weight of methyl ethyl ketone peroxide, mixed with sand using a horizontally split mold automatic molding machine at an air pressure of 3.0 Kg/cm 2 , and then sulfur dioxide gas was injected to remove the excess. The mold was molded by cleaning the gas with pressurized air. Place a 1 cm square iron plate directly under the blow port where the mixed sand is injected with pressurized air, and repeat.
After molding the mold 200 times, the iron plate was removed and the amount of contaminants adhered to it was measured. The results are shown in Table 1.
【表】
注 比較例１、２は自硬性に使用されている
公知尿素ホルマリン変性フラン樹脂。
実施例11〜20及び比較例３〜４
実施例１〜10と同様にフルフリルアルコールを
表２記載の他の成分と共重合させ同様に鋳型を成
型し、汚染物の装着により鋳型を押出すピンが作
動不良になる繰返し回数及び繰返し500回成型迄
の鋳型が正常に製造出来るのを維持するための模
型表面の清掃回数及び模型に付着されている排気
ベントの清掃回数を測定した。結果を表２に示
す。[Table] Note: Comparative Examples 1 and 2 are known urea-formalin-modified furan resins used for self-hardening.
Examples 11 to 20 and Comparative Examples 3 to 4 Furfuryl alcohol was copolymerized with other components listed in Table 2 in the same manner as in Examples 1 to 10, a mold was molded in the same manner, and the mold was extruded by attaching the contaminant. The number of times the pin malfunctioned, the number of times the model surface was cleaned to maintain normal production of the mold up to 500 repeated moldings, and the number of times the exhaust vent attached to the model was cleaned were measured. The results are shown in Table 2.
【表】
有量(B)の比を表わす。
〔発明の効果〕
本実施例で明白の様に、本発明により、模型へ
の付着汚染が大巾に低減され、鋳型製造作業中の
模型清掃作業が少なくなる結果、造型中止時間が
減少し生産性が向上する他、煩雑な作業がなくな
り、又、鋳型の品質も大巾に向上する等生産性、
品質面で大巾に改善された。[Table] Shows the ratio of abundance (B).
[Effects of the Invention] As is clear from this example, according to the present invention, contamination adhering to the model is greatly reduced, and as a result, the amount of model cleaning work during mold manufacturing work is reduced, resulting in a reduction in molding stoppage time and production efficiency. In addition to improving productivity, cumbersome work is eliminated, and the quality of molds is also greatly improved.
Great improvements have been made in terms of quality.
Claims (1)
系樹脂を粘結剤とし、過酸化物を酸化剤として二
酸化硫黄により鋳型を成型するガス硬化性鋳型製
造法に用いられる鋳型用粘結剤組成物であつて、
該フラン系樹脂がフルフリルアルコールを単独で
重縮合させるか、又はフエノール類、フエノール
類−アルデヒド重縮合物、尿素、尿素−アルデヒ
ド重縮合物、メラミン、メラミン−アルデヒド重
縮合物、ケトン−アルデヒド重縮合物、芳香族炭
化水素−アルデヒド重縮合物、一分子中に１ケ以
上のアルデヒド基を有する化合物の少なくとも一
種を混合乃至は共縮合せしめて粘結剤中のフルフ
リルアルコール含有量を低減せしめたものであ
り、粘結剤中のフルフリルアルコール含有量が30
重量％以下であるか、あるいは粘結剤原料中フル
フリルアルコール含有量と粘結剤中フルフリルア
ルコール含有量との比が１：0.6以下であるかの
少なくとも一方の条件を満足することを特徴とす
る鋳型用粘結剤組成物。 ２ 粘結剤中フルフリルアルコール含有量が30重
量％以下で、且つ粘結剤原料中フルフリルアルコ
ール含有量と粘結剤中フルフリルアルコール含有
量との比が１：0.6以下である特許請求の範囲第
１項記載の組成物。[Scope of Claims] 1. A mold viscosity used in a gas-curing mold manufacturing method in which molds are formed using sulfur dioxide using furfuryl alcohol as a main raw material and furanic resin as a binder and peroxide as an oxidizing agent. A binder composition,
The furan resin may be polycondensed with furfuryl alcohol alone, or may contain phenols, phenol-aldehyde polycondensates, urea, urea-aldehyde polycondensates, melamine, melamine-aldehyde polycondensates, ketone-aldehyde polycondensates. The content of furfuryl alcohol in the binder is reduced by mixing or co-condensing at least one of a condensate, an aromatic hydrocarbon-aldehyde polycondensate, and a compound having one or more aldehyde groups in one molecule. The content of furfuryl alcohol in the binder is 30
% by weight or less, or the ratio of the furfuryl alcohol content in the binder raw material to the furfuryl alcohol content in the binder is 1:0.6 or less. A binder composition for molds. 2. A patent claim in which the furfuryl alcohol content in the binder is 30% by weight or less, and the ratio of the furfuryl alcohol content in the binder raw material to the furfuryl alcohol content in the binder is 1:0.6 or less The composition according to item 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17444384A JPS6152955A (en) | 1984-08-22 | 1984-08-22 | Binder composition for casting mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17444384A JPS6152955A (en) | 1984-08-22 | 1984-08-22 | Binder composition for casting mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6152955A JPS6152955A (en) | 1986-03-15 |
| JPH0373378B2 true JPH0373378B2 (en) | 1991-11-21 |
Family
ID=15978598
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17444384A Granted JPS6152955A (en) | 1984-08-22 | 1984-08-22 | Binder composition for casting mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6152955A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5670171B2 (en) * | 2009-12-25 | 2015-02-18 | 花王株式会社 | Self-hardening binder composition for mold making |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5650906A (en) * | 1979-10-01 | 1981-05-08 | Japan Synthetic Rubber Co Ltd | Continuous manufacture of rubber-modified thermoplastic resin |
-
1984
- 1984-08-22 JP JP17444384A patent/JPS6152955A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5650906A (en) * | 1979-10-01 | 1981-05-08 | Japan Synthetic Rubber Co Ltd | Continuous manufacture of rubber-modified thermoplastic resin |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6152955A (en) | 1986-03-15 |
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