JP2747053B2 - Coated sand for mold production - Google Patents
Coated sand for mold productionInfo
- Publication number
- JP2747053B2 JP2747053B2 JP1229075A JP22907589A JP2747053B2 JP 2747053 B2 JP2747053 B2 JP 2747053B2 JP 1229075 A JP1229075 A JP 1229075A JP 22907589 A JP22907589 A JP 22907589A JP 2747053 B2 JP2747053 B2 JP 2747053B2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- mold
- sand
- acid
- weight
- 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
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- Mold Materials And Core Materials (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は加熱硬化して鋳型を成型する被覆砂に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to coated sand for molding by heating and curing.
従来、加熱硬化鋳型の製造法としては、耐火性粒状骨
材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
設備点に簡便であり、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。しかしながら、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 of manufacturing a heat-curable mold, there is a so-called shell mold method in which a phenol novolak resin is coated on a refractory granular aggregate and heat-cured at about 300 ° C. using hexamethylenetetramine as a catalyst. This heat-curing method is simple in terms of equipment and is most frequently used as a heat-curing mold manufacturing method at present because of its advantages such as easy operation. However, since the curing time is long and the curing temperature is high, the distortion of the mold and the distortion of the mold are large, the deburring work of the mold is indispensable, and the dimensional accuracy is insufficient. Further, the working environment is poor due to the high curing temperature, and the working environment is significantly contaminated by the thermal decomposition odor of phenol resin and hexamethylenetetramine.
また、150℃から250℃近辺で耐火性粒状骨材にフラン
樹脂、フェノールレゾール樹脂や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、シュウ酸等の硬化触媒を混じた混合物を加
熱硬化し、鋳型を生産する方法がある。これは硬化時間
がシェルモールド法よりは短く、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。In addition, furan resin, phenol resole resin, phenol or urea /
There is a method in which a mixture of an acid-curable resin such as a formalin-modified furan resin and a curing catalyst such as ammonium chloride and oxalic acid is heated and cured to produce a mold. This has a shorter curing time than the shell mold method, and is improved in terms of distortion due to temperature, dimensional accuracy and thermal working environment.
しかしながら、これらのフラン樹脂、フェノールレゾ
ール樹脂や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は常温で液体であり、従ってこれ
を鋳物用耐火物骨材と混合した場合、混練砂は湿った状
態であり、シェルモールド法のような乾態砂に比較し、
充填性が劣るためブロー方案等の対応が必要である。However, acid-curable resins such as these furan resins, phenol resole resins and phenol or urea / formalin-modified furan resins are liquid at room temperature, and therefore, when they are mixed with refractory aggregate for casting, the kneading sand becomes wet. It is in a state, compared to dry sand like the shell mold method,
Since the filling property is poor, it is necessary to take measures such as a blowing method.
このように従来の加熱硬化鋳型造型法に用いられる鋳
物砂には各々一長一短があり、これらの長所を兼ね備え
るような更に優れた鋳物砂が望まれている。As described above, each of the molding sands used in the conventional heat-curing molding method has advantages and disadvantages, and more excellent molding sands having these advantages are desired.
本発明者らは上記課題を解決すべく鋭意研究の結果、
特定の樹脂成分と硬化剤成分を耐火性粒状骨材表面に予
めコーティングし、骨材表面に固形のレジンコーティン
グ層を形成した鋳型製造用被覆砂が他の性能を低下させ
ることなく大幅に鋳型の硬化速度及び充填性を向上でき
ることを見出し本発明を完成するに至った。The present inventors have conducted intensive studies to solve the above problems,
A specific resin component and a hardener component are pre-coated on the surface of the refractory granular aggregate, and the coating sand for mold production in which a solid resin coating layer is formed on the surface of the aggregate significantly reduces the performance of the mold without reducing other performance. The inventors have found that the curing speed and the filling property can be improved, and have completed the present invention.
すなわち本発明は、常温で固体である次の樹脂成分
(イ),(ロ)と硬化剤とを耐火性骨材表面に被覆した
加熱硬化鋳型製造用被覆砂を提供するものである。That is, the present invention provides a coated sand for producing a heat-curable mold in which the following resin components (a) and (b) which are solid at ordinary temperature and a curing agent are coated on the surface of a refractory aggregate.
樹脂成分(イ)…2,5−フランジアルデヒド。Resin component (a): 2,5-furandaldehyde.
樹脂成分(ロ)…常温で固体であり、活性水素を持ち樹
脂成分(イ)と反応して (X;アルデヒド残基)を生成し得る化合物。Resin component (b): Solid at normal temperature, has active hydrogen and reacts with resin component (a) A compound capable of producing (X; aldehyde residue).
本発明に用いられる樹脂成分(ロ)としては、例えば
フェノール系モノマー、フェノール系樹脂、アミノ化合
物、アミノ系樹脂、芳香族炭化水素系樹脂等が挙げられ
る。好ましくはビスフェノールA、ビスフェノールF、
レゾルシノール、キシレノール等のフェノール系モノマ
ー、フェノール系樹脂、尿素、尿素樹脂、キシレン樹脂
等が挙げられる。Examples of the resin component (b) used in the present invention include phenolic monomers, phenolic resins, amino compounds, amino resins, aromatic hydrocarbon resins, and the like. Preferably bisphenol A, bisphenol F,
Examples include phenolic monomers such as resorcinol and xylenol, phenolic resins, urea, urea resins, xylene resins and the like.
また、本発明に用いられる樹脂成分には従来公知の変
性剤の少なくとも一種を混合もしくは共縮合させること
もできる。The resin component used in the present invention may be mixed or co-condensed with at least one conventionally known modifier.
従来公知の変性剤を具体的に例示すれば、クマロン・
インデン樹脂、石油樹脂、ポリエステル、アルキッド樹
脂、ポリビニルアルコール、エポキシ樹脂、エチレン・
ビニルアセテート、ポリビニルアセテート、ポリブタジ
エン、ポリエーテル、ポリエチレンイミン、ポリ塩化ビ
ニル、ポリアクリル酸エステル、ポリビニルブチラー
ル、フェノキシ樹脂、酢酸セルロース、キシレン樹脂、
トルエン樹脂、ポリアミド、スチレン樹脂、ポリビニル
ホルマール、アクリル樹脂、ウレタン樹脂、ナイロン等
のポリマー及びオリゴマーや、リグニン、リグニンスル
ホン酸、ロジン、エステルガム、植物油、ビチューメ
ン、重油、カチューナット殻液、バニリン、タンニン類
等の天然物や、澱粉、コーンスターチ、グルコース、デ
キストリン等の糖類及びその誘導体や、レゾルシン残
渣、クレゾール残渣、2,2,4−トリメチル−4−(ヒド
ロキシフェニル)クマロンとイソプロペニルフェノール
の反応副生物、テレフタル酸とエチレングリコールの反
応副生成物等の反応残渣及び副生物や、ポリエチレング
リコール等の多価アルコールや、アセトンシクロヘキサ
ノン、アセトフェノン等のケトン類及びアルデヒドとの
縮合物や、ジシアンジアミド、アクリルアミド、チオ尿
素等のアミノもしくはイミノ化合物及びそれらのアルデ
ヒド縮合物や、フルフラール、グリオキザール等のアル
デヒド化合物や、イソシアヌル酸エステル、不飽和脂肪
酸エステル等のエステル化合物などである。Specific examples of conventionally known denaturing agents include Coumarone
Indene resin, petroleum resin, polyester, alkyd resin, polyvinyl alcohol, epoxy resin, ethylene
Vinyl acetate, polyvinyl acetate, polybutadiene, polyether, polyethylene imine, polyvinyl chloride, polyacrylate, polyvinyl butyral, phenoxy resin, cellulose acetate, xylene resin,
Polymers and oligomers such as toluene resin, polyamide, styrene resin, polyvinyl formal, acrylic resin, urethane resin, nylon, lignin, lignin sulfonic acid, rosin, ester gum, vegetable oil, bitumen, heavy oil, headband nut shell liquid, vanillin, tannin And sugars such as starch, corn starch, glucose, and dextrin and derivatives thereof, resorcinol residue, cresol residue, and reaction reaction between 2,2,4-trimethyl-4- (hydroxyphenyl) coumarone and isopropenylphenol. Organisms, reaction residues and by-products such as reaction by-products of terephthalic acid and ethylene glycol, polyhydric alcohols such as polyethylene glycol, condensates with ketones and aldehydes such as acetone cyclohexanone and acetophenone, and dicyandiene De, acrylamide, amino or imino compounds, such as thiourea and and their aldehyde condensates, furfural, and aldehyde compounds such as glyoxal, isocyanuric acid ester, ester compounds such as unsaturated fatty acid esters, and the like.
本発明に用いられる樹脂成分は(イ),(ロ)ともに
常温で固体であるが、これを微粉砕するか、あるいは塊
状のまま加熱した鋳物砂中に投入するか、あるいは溶剤
に溶解した後、鋳物砂中に投入することにより耐火性骨
材表面に均一に付着させる。The resin component used in the present invention is a solid at room temperature in both (a) and (b), but it is finely pulverized, poured into a molding sand heated as a lump, or dissolved in a solvent. , By being poured into the foundry sand, to uniformly adhere to the surface of the refractory aggregate.
本発明において、樹脂成分(イ),(ロ)は耐火性骨
材100重量部に対し(イ)+(ロ)総量で0.5〜8重量
部、好ましくは1〜5重量部を配合する。そのうち、樹
脂成分(イ)の2,5−フランジアルデヒドは耐火性骨材1
00重量部に対し0.1〜5重量部、好ましくは0.3〜3重量
部を配合する。In the present invention, the resin components (a) and (b) are used in an amount of 0.5 to 8 parts by weight, preferably 1 to 5 parts by weight, based on 100 parts by weight of the refractory aggregate (a) + (b). Of these, 2,5-furandaldehyde, a resin component (a), is a refractory aggregate 1
0.1 to 5 parts by weight, preferably 0.3 to 3 parts by weight is added to 00 parts by weight.
本発明の樹脂成分(イ),(ロ)は予め一部反応させ
た状態で砂に被覆してもよいが、一般には反応させない
状態で砂に被覆する。被覆中に砂は加熱されているの
で、その熱により一部反応が進行することがある。Although the resin components (a) and (b) of the present invention may be coated on sand in a state where they are partially reacted in advance, they are generally coated on sand without being reacted. Since the sand is heated during the coating, the heat may cause a partial reaction.
本発明における樹脂成分(イ),(ロ)には本発明の
効果を更に一層大きくするためにシランカップリング剤
(例えばγ−ウレイドプロピルトリエトキシシラン)、
滑材(例えばステアリン酸カルシウム)等を配合しても
よい。In order to further enhance the effect of the present invention, a silane coupling agent (for example, γ-ureidopropyltriethoxysilane) is added to the resin components (a) and (b) in the present invention.
A lubricant (for example, calcium stearate) or the like may be blended.
また、本発明における硬化剤としてはシュウ酸、サリ
チル酸、マレイン酸、ホウ酸、ベンゼンスルホン酸、ト
ルエンスルホン酸、キシレンスルホン酸等の有機スルホ
ン酸等の酸の少なくとも1種、あるいはシュウ酸、サリ
チル酸、マレイン酸、ホウ酸、トルエンスルホン酸、キ
シレンスルホン酸、ベンゼンスルホン酸等の有機スルホ
ン酸等と銅、鉄、アルミニウム、亜鉛、尿素、メラミ
ン、アミンなどとの塩、塩化銅、塩化鉄等のルイス酸等
の常温で固体の酸あるいは塩が使用され、その配合量
は、樹脂成分(イ)+(ロ)総量に対して0.5〜50重量
%、好ましくは10〜40重量%である。この硬化剤を樹脂
成分と共に砂に被覆することにより鋳型造型時の被覆砂
の硬化時間を短くすることができる。Further, as the curing agent in the present invention, oxalic acid, salicylic acid, maleic acid, boric acid, benzenesulfonic acid, toluenesulfonic acid, at least one kind of acid such as organic sulfonic acid such as xylenesulfonic acid, or oxalic acid, salicylic acid, Salts of organic sulfonic acids, such as maleic acid, boric acid, toluenesulfonic acid, xylenesulfonic acid, benzenesulfonic acid, and the like, with copper, iron, aluminum, zinc, urea, melamine, amines, etc .; Lewis, such as copper chloride and iron chloride An acid or a salt which is solid at room temperature such as an acid is used, and its compounding amount is 0.5 to 50% by weight, preferably 10 to 40% by weight based on the total amount of the resin component (a) + (b). By coating the hardener with sand together with the resin component, the hardening time of the coated sand during mold making can be shortened.
本発明において用いられる耐火性粒状骨材としては、
石英質を主成分とする珪砂の他、ジルコン砂、クロマイ
ト砂、オリビン砂等が使用されるが、特にこれらに限定
されものではない。As the refractory granular aggregate used in the present invention,
Zircon sand, chromite sand, olivine sand and the like are used in addition to quartz sand containing quartz as a main component, but are not particularly limited thereto.
以下実施例にて本発明を説明するが、本発明はこれら
の実施例に限定されるものではない。Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited to these examples.
実施例1〜8 オーストラリア産フラタリー珪砂100重量部に、表−
1に示す如き硬化剤の20%メタノール溶液を2重量部、
表−1に示す如き樹脂成分(ロ)の20%メタノール溶液
5重量部を加えてミキサーにて混練し、溶剤を蒸発させ
た後、2,5−フランジアルデヒド(100mesh pass)を1
重量部及びステアリン酸カルシウム0.1重量部を加えて
混練し、種々の流動性のある被覆砂を得た。Examples 1 to 8 100 parts by weight of Australian flattery silica sand
2 parts by weight of a 20% methanol solution of a curing agent as shown in 1
After adding 5 parts by weight of a 20% methanol solution of the resin component (b) as shown in Table 1, kneading with a mixer and evaporating the solvent, 2,5-furandaldehyde (100 mesh pass) was added to 1 part.
Parts by weight and 0.1 part by weight of calcium stearate were added and kneaded to obtain various fluid coated sands.
これらの被覆砂を、予め180℃に加熱した25×25×250
m/mの型枠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た。These coated sands were previously heated to 180 ° C and 25 × 25 × 250
The m / m mold was filled by blowing with pressurized air, and baked for 10 seconds to form a mold.
抜型後10秒後の曲げ強度及び鋳型かさ比重を測定し
た。結果を表−1に示す。The bending strength and the specific gravity of the mold 10 seconds after the removal of the mold were measured. The results are shown in Table 1.
比較例1,2 オーストラリア産フラタリー珪砂100重量部に対し、
軟化点85℃、平均分子量1150のノボラック型フェノール
樹脂2重量部、20%ヘキサメチレンテトラミン水溶液1.
5重量部、ステアリン酸カルシウム0.1重量部を被覆した
樹脂被覆砂を、予め表−1に示す温度に加熱した25×25
×250m/mの金型に加圧空気と共に吹き込んで充填し、表
−1に示す時間焼成して鋳型を成型し、実施例1と同様
の評価を行った。結果を表−1に示す。Comparative Examples 1 and 2 For 100 parts by weight of Australian flattery silica sand,
2 parts by weight of a novolak phenol resin having a softening point of 85 ° C. and an average molecular weight of 1150, and a 20% aqueous solution of hexamethylenetetramine 1.
Resin-coated sand coated with 5 parts by weight and 0.1 part by weight of calcium stearate was previously heated to a temperature shown in Table 1 at 25 × 25.
A mold of × 250 m / m was filled by blowing with pressurized air and fired for the time shown in Table 1 to mold a mold. The same evaluation as in Example 1 was performed. The results are shown in Table 1.
比較例3,4 オーストラリア産フラタリー珪砂100重量部に表−1
に示す如き硬化剤の20%水溶液を0.45重量部、尿素変性
フラン樹脂を1.5重量部使用して作った被覆砂を、予め
表−1に示す温度に加熱した25×25×250m/mの金型に加
圧空気と共に吹き込んで充填し、表−1に示す時間焼成
して鋳型を成型し、実施例1と同様の評価を行った。結
果を表−1に示す。Comparative Examples 3 and 4 Table 1 shows 100 parts by weight of Australian flattery silica sand.
A coated sand prepared by using 0.45 parts by weight of a 20% aqueous solution of a curing agent and 1.5 parts by weight of a urea-modified furan resin as shown in Table 1 was heated in advance to a temperature shown in Table 1 to obtain 25 × 25 × 250 m / m gold. The mold was blown and filled together with pressurized air, fired for the time shown in Table 1, to mold a mold, and evaluated in the same manner as in Example 1. The results are shown in Table 1.
Claims (1)
(ロ)と硬化剤とを耐火性骨材表面に被覆した加熱硬化
鋳型製造用被覆砂。 樹脂成分(イ)…2,5−フランジアルデヒド。 樹脂成分(ロ)…常温で固体であり、活性水素を持ち樹
脂成分(イ)と反応して (X;アルデヒド残基)を生成し得る化合物。1. The following resin component (a) which is solid at normal temperature:
(2) A coated sand for producing a heat-cured mold, in which the surface of a refractory aggregate is coated with (b) and a curing agent. Resin component (a): 2,5-furandaldehyde. Resin component (b): Solid at normal temperature, has active hydrogen and reacts with resin component (a) A compound capable of producing (X; aldehyde residue).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1229075A JP2747053B2 (en) | 1989-09-04 | 1989-09-04 | Coated sand for mold production |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1229075A JP2747053B2 (en) | 1989-09-04 | 1989-09-04 | Coated sand for mold production |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0390245A JPH0390245A (en) | 1991-04-16 |
JP2747053B2 true JP2747053B2 (en) | 1998-05-06 |
Family
ID=16886350
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1229075A Expired - Fee Related JP2747053B2 (en) | 1989-09-04 | 1989-09-04 | Coated sand for mold production |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2747053B2 (en) |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4406506A (en) * | 1981-08-03 | 1983-09-27 | Automation Industries, Inc. | Shielded cover for a quick-release electrical connector |
-
1989
- 1989-09-04 JP JP1229075A patent/JP2747053B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH0390245A (en) | 1991-04-16 |
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