KR101866670B1 - Coating agent composition for evaporative patterns - Google Patents

Abstract

The graphitizing composition for a disappearance model of the present invention contains refractory aggregate and cellulose, and the content of the cellulose is 1 to 10 parts by mass with respect to 100 parts by mass of the refractory aggregate. The mold-making composition for a disappearance model of the present invention can provide a mold-release composition for a mold disappearance which is highly safe and can further suppress residual defects.

Description

TECHNICAL FIELD The present invention relates to a COATING AGENT COMPOSITION FOR EVAPORATIVE PATTERNS,

The present invention relates to a composition for a painted mold for a disappearing model which is adhered to the periphery of a disappearance model.

The disappearance model casting method is a casting method in which a synthetic resin foam model having the same shape as the product is replaced with a molten metal (hereinafter also referred to as " molten metal "), Delivery time, and so on. Therefore, it is a casting method which has been attracting attention recently. In this casting method, since the synthetic resin foam is pyrolyzed by the molten metal poured into the mold, a large amount of pyrolysis gas and residues are disadvantageous in that residue defects are generated in the casting. Particularly, when polystyrene is used as the synthetic resin foam, the cast surface is deteriorated by the carbonized component.

In the disappearing model casting method, the patterning agent for the disappearing model is used in order to prevent "residue defects" attributable to thermal decomposition of the synthetic resin foam model and "trapping defects" in which the molten metal leaks into the mold (sand mold) Is used.

Residual defects are a phenomenon in which, when the synthetic resin foam model replaces the molten metal, the pyrolysis gas is insufficiently discharged, it becomes a pyrolysis residue and is entrained in the upper part of the product. In order to prevent such " residue defects ", it is required that the pyrolysis gas of the synthetic resin foam model be efficiently discharged to the mold side. As for the " adhesion defect ", it is required to continue to be maintained as a strong film until solidification of the molten metal is completed.

Japanese Patent Laid-Open Publication No. 3-180244 discloses a nitrocellulose composition which is insoluble in water and soluble in a hydrophilic organic solvent. The composition of the present invention for the dissolution model is selected from a material which is white-precipitated and micro-dispersed in a water-hydrophilic organic solvent system, and nitrocellulose is micro-dispersed and micro-dispersed in a liquid to reduce residue defects. Japanese Patent Application Laid-Open No. 2001-1104 discloses a mold-forming composition containing an organic solid to reduce residual defects.

 The graphitizing composition for a disappearance model of the present invention contains refractory aggregate and cellulose, and the content of the cellulose is 1 to 10 parts by mass with respect to 100 parts by mass of the refractory aggregate.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view of a disappearance model used in the evaluation of the embodiment. Fig.

In the conventional composition for forming a mold for a disappearance model, prevention of residual defects is not sufficient and further improvement is required. In addition, nitrocellulose is used in the composition of a mold for a disappearance model related to Japanese Unexamined Patent Application Publication No. 3-180244, which poses a problem in safety.

The present invention provides a mold release composition for a destruction mold which has high safety and can further suppress residual defects.

The graphitizing composition for a disappearance model of the present invention contains refractory aggregate and cellulose, and the content of the cellulose is 1 to 10 parts by mass with respect to 100 parts by mass of the refractory aggregate.

According to the present invention, it is possible to provide a mold-stopping composition for a disappearance model that is highly safe and can further suppress residual defects.

Hereinafter, an embodiment of the present invention will be described.

The graphitizing composition for a disappearing model (hereinafter, simply referred to as " mold-forming composition ") of the present embodiment contains refractory aggregate and cellulose, and the content of the cellulose is 1 to 10 parts by mass relative to 100 parts by mass of the refractory aggregate to be. According to the composition of the present invention, the composition for a mold disappearance model has high safety and exhibits an effect of further suppressing residual defects. The reason for achieving such an effect is not clear, but is considered as follows.

In order to prevent residue defects, it is important that the pyrolysis gas of the synthetic resin foam model is efficiently discharged from the mold film until the casting is completed. In the mold-stopping composition according to the present embodiment, the cellulose is dispersed in the graphite film in order to contain cellulose in the refractory aggregate of the casting composition. Since the cellulose is burned by heat at the time of casting, the portion where the cellulose is present becomes void. It is considered that this gap becomes a gas hole, and the pyrolysis gas of the synthetic resin foam can be efficiently discharged, so that the residue defects can be reduced.

Hereinafter, the components contained in the mold-stopping composition for a disappearance model of the present embodiment will be described.

[Composition composition for dissolution model]

<Refractory aggregate>

The mold stopper composition according to the present embodiment contains refractory aggregate. As the refractory aggregate, refractory aggregates conventionally used for the purpose of casting can be used. Examples of the refractory aggregate include mica, obsidian, perlite, sandstone, quartzite, zircon, calcite, silica, alumina, mullite, shaft bauxite, diaspore, spinel, magnesia, olivine, talc, zircon , Kaolin, silymarinite, anthracite, kyanite, gibbsite, black stone, dickite, plaster stone, graphite and bauxite. The refractory aggregate may be used as one or more of the above-mentioned refractory aggregates.

The average particle diameter of the refractory aggregate is preferably 20 占 퐉 or more, more preferably 40 占 퐉 or more, and most preferably 50 占 퐉 or more from the viewpoint of preventing residual defects. The average particle diameter of the refractory aggregate is preferably 400 占 퐉 or less, more preferably 200 占 퐉 or less, and even more preferably 150 占 퐉 or less, from the viewpoint of preventing the occurrence of dislocation defects. The average particle diameter of the refractory aggregate is preferably 20 to 400 占 퐉, more preferably 40 to 200 占 퐉, and still more preferably 50 to 150 占 퐉. The average particle diameter of the refractory aggregate is measured by the method described in the embodiment.

The content of the refractory aggregate of the mold release composition of the present embodiment is preferably not less than 30% by mass and more preferably not less than 40% by mass from the viewpoint of prevention of coating film defects such as drying and cracking. The content of the refractory aggregate of the mold-forming composition of the present embodiment is preferably 80 mass% or less, and more preferably 70 mass% or less, from the viewpoint of coating workability. The content of the refractory aggregate in the mold-stopping composition of the present embodiment is preferably 30 to 80 mass%, more preferably 40 to 70 mass%.

<Cellulose>

Cellulose according to this embodiment is a carbohydrate (polysaccharide) represented by the molecular formula (C ₆ H ₁₀ O ₅ ) n, and is a main component of cell walls and fibers of plant cells.

In order for the gas to be generated after the cellulose dispersed in the graphite film disappears after combustion, it is necessary that the gas ball is present until the combustion is completed at the temperature of 250 to 400 캜, which is the temperature of the gas layer at the casting, until the casting is completed. For this reason, it is preferable that cellulose is decomposed at 250 to 400 ° C, and the residual carbon percentage and the ash after decomposition are small.

The cellulose used in the present embodiment is not particularly limited, but from the viewpoint of handling, it is preferable that the cellulose is produced from a broad-leaved tree, a conifer, or bamboo, and it may be regenerated from a grip such as a newspaper or a copy paper.

The content of the cellulose in the composition for forming a pattern according to the present embodiment is preferably 1 part by mass or more and more preferably 3 parts by mass or more from the viewpoint of reduction of residue defects with respect to 100 parts by mass of the refractory aggregate, More preferably at least 4 parts by mass, and still more preferably at least 4 parts by mass. The content of the cellulose in the composition for forming a pattern according to the present embodiment is preferably 10 parts by mass or less, more preferably 7 parts by mass or less, from the viewpoint of the occurrence of defective attachment (coating film strength at the time of heating) to 100 parts by mass of the refractory aggregate And more preferably 6 parts by mass or less. The content of cellulose in the composition for forming a pattern according to the present embodiment is preferably 1 to 10 parts by mass, more preferably 3 to 7 parts by mass, and even more preferably 4 to 6 parts by mass relative to 100 parts by mass of the refractory aggregate.

The shape of the cellulose is not particularly limited, and for example, fibrous or particulate form is used.

When the shape of the cellulose is fibrous, the ratio of the fiber length to the fiber diameter (fiber length / fiber diameter) is preferably 1.5 or more, and more preferably 5 or more, from the viewpoint of reduction of residue defects. From the viewpoint of reducing the occurrence of the defect, the fiber length / fiber diameter is preferably 50 or less, more preferably 40 or less, and even more preferably 20 or less. The fiber length / fiber diameter is preferably 1.5 to 50, more preferably 5 to 40, and still more preferably 5 to 20.

When the shape of the cellulose is fibrous, the fiber length is preferably 50 占 퐉 or more, and more preferably 80 占 퐉 or more, from the viewpoint of reduction of residue defects. From the viewpoint of reducing the occurrence of the defect, the fiber length is preferably 1000 占 퐉 or less, more preferably 600 占 퐉 or less, and further preferably 300 占 퐉 or less. The fiber length is preferably 50 to 1000 占 퐉, more preferably 80 to 600 占 퐉, and even more preferably 80 to 300 占 퐉. Further, in this specification, the fiber length is measured by the method described in the embodiment.

When the shape of the cellulose is fibrous, the fiber diameter is preferably 10 占 퐉 or more, and more preferably 20 占 퐉 or more, from the viewpoint of reduction of residue defects. Further, from the viewpoint of reducing the occurrence of the defect, the fiber diameter is preferably 200 占 퐉 or less, more preferably 80 占 퐉 or less. The fiber diameter is preferably 10 to 200 mu m, more preferably 20 to 80 mu m. Further, in the present specification, the fiber diameter is measured by the method described in the embodiment.

When the shape of the cellulose is particulate, the average particle diameter of the cellulose is preferably 50 占 퐉 or more, more preferably 80 占 퐉 or more, and most preferably 100 占 퐉 or more, from the viewpoint of reduction of residue defects. The average particle diameter of the cellulose is preferably 500 탆 or less, and more preferably 200 탆 or less, from the viewpoint of reducing the occurrence of dislocation defects. The average particle diameter of the cellulose is preferably 50 to 500 占 퐉, more preferably 80 to 200 占 퐉, and even more preferably 100 to 200 占 퐉. Further, in the present specification, the average particle diameter is measured by the method described in Examples.

When the shape of the cellulose is particulate, the sphericity of the cellulose is preferably 0.90 or more, and more preferably 0.95 or more from the viewpoint of coating properties into a synthetic resin foam model. In addition, the sphericity of the cellulose is preferably 1.00 or less from the viewpoint of the coating property into a synthetic resin foam model. The sphericity of the cellulose is preferably 0.90 to 1.00, more preferably 0.95 to 1.00. Further, in this specification, the sphericity is measured by the method described in the embodiment.

<Dispersion>

In the disappearing model casting method of the present embodiment, since the space after burning and disappearing of the cellulose by the heat at the time of casting is made into a gas hole, voids which become the gas holes are hardly formed by using a dispersion medium for dissolving cellulose. Therefore, it is preferable that the dispersion medium does not dissolve the cellulose.

As the dispersion medium, for example, alcohol or water can be used.

In the case of an alcohol-based composition, low-alcohol such as methanol, ethanol and isopropyl alcohol is preferable from the standpoint of drying property, and ethanol is more preferable. In the case of an alcohol type composition, an aromatic solvent or a hydrocarbon solvent may be used as an auxiliary dispersion medium.

The amount of the dispersion medium in the alcohol type mold release agent composition can be appropriately changed depending on the kind of the dispersion medium to be used. For example, when the dispersion medium is a lower alcohol, the amount is preferably 20 parts by mass or more, and more preferably 70 parts by mass or more, based on 100 parts by mass of the refractory aggregate from the viewpoint of coating workability. The amount of the dispersion medium in the alcoholic graphitizing composition is preferably 120 parts by mass or less, more preferably 110 parts by mass or less, based on 100 parts by mass of the refractory aggregate, from the viewpoint of prevention of coating film defects such as drying and cracking, Do. The amount of the dispersion medium in the alcoholic graphitizing composition is preferably from 20 to 120 parts by mass, more preferably from 70 to 110 parts by mass, per 100 parts by mass of the refractory aggregate, from the viewpoint of forming a good coating film, .

In the case of the water-based composition, the amount of water in the water-based mold-making composition is preferably 20 parts by mass or more, more preferably 70 parts by mass or more based on 100 parts by mass of the refractory aggregate from the viewpoint of coating workability. In the case of the water-based mold-making composition, the amount of water in the water-based mold-making composition is preferably 150 parts by mass or less, more preferably 130 parts by mass or less, based on 100 parts by mass of the refractory aggregate from the viewpoint of drying property. In addition, in the case of a waterborne graphite composition, the amount of water in the waterborne graphite composition is preferably from 20 to 150 parts by mass, more preferably from 70 to 130 parts by mass, per 100 parts by mass of the refractory aggregate from the viewpoint of coating workability and drying property.

<Point payment>

The composition for forming a pattern of the present embodiment may contain a commonly used binder. For example, water-soluble polymers such as sodium polyacrylate, starch, methyl cellulose, polyvinyl alcohol, sodium alginate, and gum arabic and various resin emulsions can be used as the binder. In addition, in the alcohol system, it is preferable to add various resins soluble or dispersible in alcohol from the viewpoint of the film strength. The content of the binder is preferably 0.5 parts by mass or more, more preferably 30 parts by mass or less, based on 100 parts by mass of the refractory aggregate, from the viewpoints of film strength and economical efficiency. The content of the binder is preferably 0.5 to 30 parts by mass with respect to 100 parts by mass of the refractory aggregate from the viewpoints of film strength and economical efficiency.

<Small payment>

The mold-stopping composition of the present embodiment may contain a commonly used sintering agent. Examples of the sintering agent include bentonite such as sodium bentonite and calcium bentonite; clay such as clay clay; and ethyl silicate. Among them, bentonite is preferable because it can fulfill its role as a sludge settlement in a high temperature region in addition to its role as a binder. The addition amount of the sintering agent is preferably at least 0.5 part by mass, more preferably at least 1.0 part by mass, based on 100 parts by mass of the refractory aggregate, from the viewpoint of the coating film strength at high temperature. The addition amount of the sintering agent is preferably 30 parts by mass or less, more preferably 15 parts by mass or less, based on 100 parts by mass of the refractory aggregate, from the viewpoint of the film strength at high temperature. The addition amount of the sintering agent is preferably from 0.5 to 30 parts by mass, more preferably from 1.0 to 15 parts by mass, per 100 parts by mass of the refractory aggregate, from the viewpoint of the coating film strength at high temperature.

&Lt; Other components &gt;

Examples of other components that can be blended in the composition of the present invention include a surfactant, a dispersant, and a thixotropic property-imparting agent.

The mold-forming composition of the present embodiment can be preferably used as a mold-stopping composition adhered to the periphery of a disappearing mold.

[Manufacturing method of mold for casting]

In the manufacturing method of the casting chamber for casting according to the present embodiment, a conventional manufacturing method for casting chamber for casting can be applied. A manufacturing method of a casting chamber mold for casting according to the present embodiment is a manufacturing method of a casting chamber mold for casting having a casting film around a casting mold, wherein the casting mold composition for a casting mold is attached to the periphery of the casting mold to form a casting film Process.

As the disappearance model to which the mold-stopping composition of the present embodiment is adhered, a model of a synthetic resin foam the same as usual can be used. As the synthetic resin foam, a foam such as polystyrene, methyl polymethacrylate, or a copolymer thereof is used. When the disintegration model to which the mold-stopping composition of the present embodiment is applied is foamed polystyrene, the effect of the mold-stopping composition of the present embodiment is further obtained. The method of forming the graphic film by adhering the composition of the present invention to the disappearance model may be any of conventionally known methods such as flow coating (dipping method), dipping (dipping method), brush application, spray coating and the like.

The casting chamber disappearance chamber model obtained by the manufacturing method of the casting chamber model of the present embodiment can be suitably used in the method of manufacturing the casting chamber by the dissolution chamber casting method.

[Process for producing castings]

In the method for producing castings by the fume model casting method of the present embodiment, the casting method by the conventional fume model casting method can be applied. The casting production method of the present embodiment is a casting production method using a casting mold for casting obtained by the manufacturing method of casting mold for casting, the casting method comprising the steps of: embedding the casting mold for casting into sand molding; And a step of pouring the molten metal into the mold for casting buried in the foundry sand.

As the foundry sand used in the process of embedding the casting mold for casting in the foundry sand, a shrine or regenerated yarn such as zircon yarn, chromite yarn, synthetic ceramics yarn or the like is used in addition to silica sand mainly composed of quartz. The molding sand can be used without adding a binder. In this case, the filling property is good. However, when a high-strength mold is required, it is preferable to add a conventionally known binder and harden it with a curing agent.

The method for producing a casting according to this embodiment relating to the case where the binder is added is a method for producing a casting using a casting chamber for casting obtained by the manufacturing method of the casting chamber for casting, And a step of pouring the molten metal into the casting chamber for casting buried in the mixture, and a step of pouring molten metal into the casting chamber for casting buried in the mixture.

As the binder, a commonly used binder may be used. As the binder, water-soluble polymers such as sodium polyacrylate, starch, methyl cellulose, polyvinyl alcohol, sodium alginate, and gum arabic, and various resin emulsions can be used in the aqueous system. In the alcohol system, it is preferable to add various resins soluble or dispersible in alcohol from the viewpoint of mold strength. The content of the binder is preferably at least 0.4 part by mass, more preferably at least 0.5 part by mass based on 100 parts by mass of the molding sand from the viewpoints of mold strength and economic efficiency. The content of the binder is preferably 1.2 parts by mass or less, more preferably 0.8 parts by mass or less, based on 100 parts by mass of the molding sand, from the viewpoints of mold strength and economical efficiency. The content of the binder is preferably from 0.4 to 1.2 parts by mass, more preferably from 0.5 to 0.8 parts by mass, per 100 parts by mass of the molding sand, from the viewpoints of mold strength and economical efficiency.

In the casting method of the present embodiment, the injection temperature differs depending on the metal used. In the cast iron system, the casting temperature is generally 1330 to 1410 deg. C, in the case of aluminum system, the casting temperature is generally 700 to 750 deg. In the case of a steel system, it is generally 1450 to 1500 ° C. The defect model casting method of the present embodiment can reduce residual defects occurring in the cast iron system more particularly.

When a casting is produced by using the casting mold composition for a disappearance model, a casting having a small amount of residual defects and fewer defects is obtained and an excellent casting surface is obtained, so that a complicated structure and a beauty of the surface of the casting surface are required . Examples of concrete castings include automobile molds, machine tools, members used for hydraulic valves of construction machines, motors, engine frames, building members, and parts.

With regard to the above-described embodiments, the present invention further discloses the following composition, manufacturing method, or use.

&Lt; 1 &gt; A mold-making composition for a mold loss model, comprising a refractory aggregate and a cellulose, wherein the content of the cellulose is 1 to 10 parts by mass with respect to 100 parts by mass of the refractory aggregate.

<2> The average particle diameter of the refractory aggregate is preferably 20 μm or more, more preferably 40 μm or more, more preferably 50 μm or more, more preferably 400 μm or less, more preferably 200 μm or less, and most preferably 150 More preferably 20 to 400 占 퐉, more preferably 40 to 200 占 퐉, and still more preferably 50 to 150 占 퐉.

<3> The content of the refractory aggregate is preferably at least 30 mass%, more preferably at least 40 mass%, even more preferably at least 80 mass%, more preferably at most 70 mass%, even more preferably from 30 to 80 mass% , And more preferably from 40 to 70 mass%, based on the total amount of the composition.

<4> The content of the cellulose is preferably at least 1 part by mass, more preferably at least 3 parts by mass, further preferably at least 4 parts by mass, and most preferably at most 10 parts by mass based on 100 parts by mass of the refractory aggregate, More preferably 6 mass parts or less, further preferably 1 to 10 mass parts, more preferably 3 to 7 mass parts, still more preferably 4 to 6 mass parts, in addition to the above-mentioned <1> to <3> Wherein the composition for a dissolving mold is prepared by dissolving the composition in an aqueous medium.

&Lt; 5 &gt; The mold-making composition according to any one of &lt; 1 &gt; to &lt; 4 &gt;, wherein the cellulose is fibrous.

<6> The ratio of the fiber length to the fiber diameter (fiber length / fiber diameter) of the cellulose is preferably 1.5 or more, more preferably 5 or more, more preferably 50 or less, more preferably 40 or less, , More preferably 1.5 to 50, more preferably 5 to 40, and still more preferably 5 to 20. The composition for a mold disappearance model according to &lt; 5 &gt;

The fiber length of the cellulose is preferably 50 μm or more, more preferably 80 μm or more, more preferably 1000 μm or less, still more preferably 600 μm or less, still more preferably 300 μm or less, The mold-releasing composition for a deletion mold according to the above-mentioned &lt; 5 &gt; or &lt; 6 &gt;, wherein desirably is 80 to 600 mu m, more preferably 80 to 300 mu m.

The cellulose fiber preferably has a diameter of 10 탆 or more, more preferably 20 탆 or more, more preferably 200 탆 or less, more preferably 80 탆 or less, more preferably 10 to 200 탆, more preferably 20 to 80 탆 The composition for a mold disappearance model according to any one of &lt; 5 &gt; to &lt; 7 &gt;

&Lt; 9 &gt; The composition for a mold disappearance model according to any one of &lt; 1 &gt; to &lt; 4 &gt;, wherein the cellulose is in a particulate form.

<10> The average particle diameter of the cellulose is preferably 50 μm or more, more preferably 80 μm or more, more preferably 100 μm or more, more preferably 500 μm or less, more preferably 200 μm or less, Is preferably 500 m, more preferably 80 to 200 m, and further preferably 100 to 200 m.

<11> The sphericity of the cellulose is preferably 0.90 or more, more preferably 0.95 or more, preferably 1.00 or less, more preferably 0.90 to 1.00, and more preferably 0.95 to 1.00. &Lt; / RTI &gt;

<12> The composition for a mold disappearance model according to any one of <1> to <11>, further comprising a dispersion medium, wherein the dispersion medium does not dissolve the cellulose.

<13> The composition for a mold disappearance model according to <12>, wherein the dispersion medium is preferably a lower alcohol and more preferably methanol.

The content of the dispersion medium is preferably 20 parts by mass or more, more preferably 70 parts by mass or more, further preferably 120 parts by mass or less, more preferably 110 parts by mass or less, and most preferably 20 parts by mass or less, based on 100 parts by mass of the refractory aggregate. To 120 parts by mass is preferable, and 70 parts by mass to 110 parts by mass is more preferable.

&Lt; 15 &gt; The composition for a mold disappearance model according to the above [12], wherein the dispersion medium is water.

The amount of the dispersion medium is preferably not less than 20 parts by mass, more preferably not less than 70 parts by mass, and more preferably not more than 150 parts by mass, and most preferably not more than 130 parts by mass, with respect to 100 parts by mass of the refractory aggregate, , More preferably 70 to 130 parts by mass, per 100 parts by mass of the composition.

The content of the binder is preferably 0.5 parts by mass or more, more preferably 30 parts by mass or less, more preferably 0.5 to 30 parts by mass, based on 100 parts by mass of the refractory aggregate. To &lt; 16 &gt;.

The amount of the sintering agent to be added is preferably 0.5 part by mass or more, more preferably 1.0 part by mass or more, and preferably 30 parts by mass or less, more preferably 15 parts by mass or less, based on 100 parts by mass of the refractory aggregate, Or less, more preferably 0.5 to 30 parts by mass, and still more preferably 1.0 to 15 parts by mass, relative to 100 parts by mass of the resin composition.

&Lt; 19 &gt; The composition for a mold disappearance model according to the above [18], wherein the sintering agent is bentonite.

<20> The content of inorganic fibers, inorganic pigment and metal powder is preferably less than 5.0 parts by mass based on 100 parts by mass of the refractory aggregate, more preferably less than 3.0 parts by mass, &Lt; / RTI &gt;

<21> A method for manufacturing a mold for casting having a mold film around a mold for destruction, comprising the step of attaching the mold composition for a mold disappearance model described in any one of <1> to <20> Wherein the method comprises the steps of:

&Lt; 22 &gt; A method for manufacturing a disappearance chamber for casting, wherein the disappearance model is foamed polystyrene.

<23> A method of manufacturing a casting using a casting chamber for casting obtained by the manufacturing method of casting chamber for casting according to <21> or <22>, the method comprising the steps of: A method for manufacturing a casting having a process of pouring molten metal into a mold for a casting buried in a molding sand.

<24> A method of manufacturing a casting using a firing chamber for casting obtained by the manufacturing method of a casting chamber for casting according to <21> or <22>, wherein a binder and a hardening agent for hardening the binder are added to the molding sand, And a step of pouring the molten metal into the casting chamber for casting buried in the mixture. 2. The casting method according to claim 1,

&Lt; 25 &gt; Use as a patterning agent for a disappearance model of a mold-making composition for a disappearance model according to any one of &lt; 1 &gt;

<26> The use of the casting chamber for casting obtained by the use of the above <25>.

Example

Best Mode for Carrying Out the Invention Hereinafter, embodiments and the like that specifically describe the present invention will be described.

&Lt; Preparation of composition for mold-

&Lt; Example 1 &gt;

(20 mass%, average particle diameter: 79 占 퐉)) and 100 parts by mass of the refractory aggregate were added to a refractory aggregate (60 mass%, average particle diameter 80 占 퐉), obsidian (20 mass% 6.0 parts by mass of the additive shown in Table 1, 3.0 parts by mass of a nonionic surfactant (manufactured by Kao Corporation, Emergen 106), 2.0 parts by mass of bentonite, 2.0 parts by mass of polyvinyl alcohol, and 40 parts by mass of ion- To prepare a mold release agent composition.

&Lt; Examples 2 to 12 and Comparative Examples 1 to 3 &gt;

The same procedure as in Example 1 was carried out except that the additives and amounts shown in Table 1 were used. The unit of addition amount shown in Table 1 is mass%. However, the cellulose used in Example 7 was obtained by treating KC flock W-50GK with a sieve of 20 meshes (mesh interval: 0.85 mm) and not passing through the sieve of the sieve.

<Evaluation method>

<Fiber Diameter>

Is a value obtained by measuring fiber diameters of arbitrary 50 particles obtained by image analysis of an image (photograph) obtained by a scanning electron microscope.

<Fiber length>

Is a value obtained by measuring the fiber length of any 50 particles obtained by image analysis of an image (photograph) obtained by a scanning electron microscope.

<Average Particle Diameter>

The average particle diameter is an average particle diameter of 50% of volume cumulative as measured using a laser diffraction particle size distribution measuring apparatus (manufactured by Horiba Ltd., LA-920). The analysis conditions are as follows.

· Measurement method: flow method

· Dispersion medium: ion-exchange water

· Dispersion method: stirring, internal ultrasonic 3 minutes

Sample concentration: 2 mg / 100 cc

<Spherical Diagram>

The sphericity is calculated from an area and a circumferential length of a projected section obtained by image analysis of an image (photograph) obtained by a scanning electron microscope of each of the refractory aggregate particles, and a circumferential circle having an area equal to the area (mm ² ) Length (mm)] / [circumferential length (mm) of the projected section] is obtained, and this value is averaged for any 50 pieces of refractory aggregate particles.

&Lt; Volume ratio of additive (solid) to refractory aggregate &gt;

The specific gravity of obsidian was 2.3, the specific gravity of silica was 2.7, the specific gravity of graphite was 2.2, and the specific gravity of additives other than cellulose was 1.0.

&Lt; Evaluation method of residual defects &gt;

Using the expanded polystyrene (expansion ratio of 50 times), the disappearance model 1 having the shape shown in Fig. 1 was produced. The mold release composition was adhered to the circumference of this disappearance model (dry film thickness: 1.4 mm) to prepare a mold for casting. Then, 0.2 part by mass of an organic sulfonic acid curing agent (C-14, manufactured by Kao Quaker Co., Ltd.) was added to 100 parts by mass of Fremantle silica (No. 5) and kneaded. Thereafter, furan resin (EF- 0.5 parts by mass based on 100 parts by mass. The casting chamber for casting was embedded in the obtained kneading yarn, and the casting was carried out from the beam at a speed at which the molten metal did not flow over (cast iron: FC-250, injection temperature: 1400 DEG C) And the castings were taken out. With respect to the obtained castings, the area (%) of residues generated on the two side surfaces of 400x100 on the side of the TP was measured by image analysis.

&Lt; Evaluation method of air-permeability at room temperature, air-

The air-permeability at room temperature was measured in accordance with the method described in "5. Test Method of Graphic Materials for Loss Model Casting (Mar. 1996)" issued by the Office of the Japanese Foundry Engineering Society, Air permeability test method &quot;. After the test piece was completed, the air-permeability was measured by heating to 300 ° C for 30 minutes in an oven capable of maintaining 300 ° C ± 10 ° C and cooling to room temperature. In addition, except for the heating process, it was measured with the same roughness as the air-permeability at room temperature.

<Solid content 65% Viscosity>

To the graphant shown in Table 1, ion-exchanged water was added to adjust the solid content to 65%. Thereafter, the viscosity (mPa · s) after the 60-second hysteresis was measured under a condition of a shear rate of 10 s ^{-1 with} a rheometer (condition: parallel cone, 20 ° C., clearance 1 mm).

&Lt; 1000 캜 &lt;

For the graphic formulations shown in Table 1, refer to "6. Method of testing the graphic form for casting the disappearance model (Mar. 8, 2008)" issued by the office of the Japan Foundry Engineering Institute. Quot ;, and &quot; anti-perspiration measurement method &quot;. In addition, for the heat treatment at 1000 占 폚, scaled graphite having an average particle diameter of 60 占 퐉 was filled in a crucible of? 50 to make a non-oxidizing atmosphere, and a test piece was buried therein. Thereafter, the sample was heated in a muffle furnace maintained at 1000 ° C ± 30 ° C for 1 hour, cooled to room temperature and measured. In addition to the heating process, &quot; 6. Quot; anti-perspiration measurement method &quot;.

&Lt; Examples 1 to 12 and Comparative Examples 1 to 3 &gt;

The results of the respective Examples and Comparative Examples are shown in Table 2.

Claims (14)

Wherein the content of the cellulose is 1 to 10 parts by mass with respect to 100 parts by mass of the refractory aggregate, the dispersion medium does not dissolve the cellulose,
Wherein the cellulose is at least one of fibrous cellulose and particulate cellulose,
The fiber length of the fibrous cellulose is 50 to 1000 탆,
Wherein the particulate cellulose has an average particle diameter of 50 to 500 占 퐉. The method according to claim 1,
Wherein the content of the cellulose is 3 to 7 parts by mass based on 100 parts by mass of the refractory aggregate. The method according to claim 1,
Further comprising a sludge settlement, and a content of the sludge settlement is 0.5 to 30 parts by mass based on 100 parts by mass of the refractory aggregate. delete The method according to claim 1,
Wherein the ratio of the fiber length to the fiber diameter (fiber length / fiber diameter) of the cellulose is from 1.5 to 50. delete delete delete The method according to claim 1,
Wherein the content of the inorganic fibers, the inorganic pigment, and the metal powder is less than 5.0 parts by mass based on 100 parts by mass of the refractory aggregate. A method for manufacturing a mold for casting having a mold film around a mold,
A manufacturing method of a mold for a casting mold having a process of forming a graphic film by attaching the mold-making composition for a mold disappearance model according to any one of claims 1 to 3, 5 and 9 to the periphery of the mold . A method of producing a casting using a firing chamber for casting obtained by the manufacturing method of the casting chamber for casting according to claim 10,
A step of embedding the casting mold for casting in a molding sand;
And a step of pouring the molten metal into the mold for the casting buried in the foundry sand. A sculpting agent for a disappearing model using the scent composition for a disappearance model according to any one of claims 1 to 3, 5 and 9. A casting mold for a casting mold manufactured using the moldings for the disappearing model of claim 12. delete

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