JP6411082B2 - Binder composition for mold making - Google Patents

Description

  The present invention relates to a binder composition for mold making.

  As a molding method for producing a mold such as a main mold or a core using a binder, a self-hardening mold molding method is known. As the self-hardening mold making method, there is known a mold making method in which a water-soluble phenol resin as a binder is hardened with an ester hardening agent.

  Silica sand, zircon sand, chromite sand, olivine sand, and the like have been widely used as refractory particles used for mold making. However, in recent years, as shown in Patent Document 1, alumina silicate is used. Artificial synthetic mullite sand by a sintering method mainly used is gradually being used because of its excellent fire resistance, thermal expansion, wear resistance, and crush resistance. More recently, artificial sand produced by a melting method is being used to produce a mold having high strength and a smooth surface (Patent Document 2 below).

JP 2000-153337 A JP 2004-202577 A

  However, when using recycled sand made of artificial sand produced by the melting method as refractory particles and molding a mold by curing a water-soluble phenolic resin with an ester-based curing agent, compared to using fresh sand There was a problem that the mold strength was lowered.

  The present invention is for mold making that can suppress a decrease in mold strength even when a reclaimed sand made of artificial sand is used as refractory particles and a mold is formed by curing a water-soluble phenol resin with an ester curing agent. A binder composition and a method for producing a mold are provided.

  The binder composition for mold making of the present invention is a binder composition for mold making containing a water-soluble phenol resin and a polyamine.

  According to the present invention, even when reclaimed sand made of artificial sand is used as refractory particles and a mold is formed by curing a water-soluble phenol resin with an ester-based curing agent, a mold that can suppress a decrease in mold strength can be suppressed. A binder composition for molding can be provided.

  The binder for mold making of this embodiment (hereinafter also referred to as a binder composition) is a binder composition for mold making containing a water-soluble phenol resin and a polyamine. The mold forming binder composition uses regenerated sand made of artificial sand as refractory particles, and suppresses reduction in mold strength even when molding a mold by curing a water-soluble phenolic resin with an ester-based curing agent. can do. The reason for such an effect is not clear, but the polyamine group reacts with the methylol group of the water-soluble phenol resin, and the crosslinking point increases, thereby improving the binder strength and suppressing the decrease in the template strength. It is considered possible.

  Hereinafter, the binder composition for mold making according to the present embodiment will be described.

<Binder composition for mold making>
[Water-soluble phenolic resin]
The water-soluble phenol resin is a resin curable with an ester compound, and is generally obtained by polycondensation of a phenol compound and an aldehyde compound under alkaline conditions. Among these, phenol compounds including phenol, bisphenol A, bisphenol F, cresol, 3,5-xylenol, resorcin, catechol, nonylphenol, p-tert-butylphenol, isopropenylphenol, phenylphenol, and other substituted phenols And mixtures of various phenol compounds such as cashew nut shell liquid can be used alone or in combination. Moreover, as an aldehyde compound, formaldehyde, a furfural, a glyoxal, etc. can be used 1 type or in mixture of 2 or more types. These compounds can be used as an aqueous solution as needed. In addition, monomers capable of condensing with aldehyde compounds such as urea, melamine and cyclohexanone, monovalent aliphatic alcohol compounds such as methanol, ethanol, isopropyl alcohol, normal propyl alcohol and butyl alcohol, water-soluble polymers Polyacrylic acid salt, cellulose derivative polymer, polyvinyl alcohol, lignin derivative, etc. may be mixed.

  Examples of the alkali catalyst used for the synthesis of the water-soluble phenol resin include hydroxides of alkali metals such as LiOH, NaOH, and KOH, and NaOH and KOH are particularly preferable. Moreover, you may mix and use these alkali catalysts.

  From the viewpoint of improving mold strength, the solid content mass of the water-soluble phenol resin (solid mass after drying at 105 ° C. for 3 hours) is preferably 30% by mass or more, and more preferably 45% by mass or more. The solid content mass of the water-soluble phenol resin is preferably 80% by mass or less, and more preferably 65% by mass or less from the viewpoint of improving the mold strength. Moreover, the solid content mass of the water-soluble phenol resin is preferably 30 to 80% by mass and more preferably 45 to 65% by mass from the viewpoint of improving the mold strength.

  The weight average molecular weight (Mw) of the water-soluble phenol resin is preferably 500 or more, more preferably 800 or more, from the viewpoint of improving the mold strength. The weight average molecular weight (Mw) of the water-soluble phenol resin is preferably 8000 or less, and more preferably 5000 or less, from the viewpoint of improving the mold strength. Moreover, the weight average molecular weight (Mw) of the water-soluble phenol resin is preferably 500 to 8000, more preferably 800 to 5000, from the viewpoint of improving the mold strength. In addition, the weight average molecular weight of water-soluble phenol resin is measured by the method as described in an Example.

  From the viewpoint of improving the mold strength, the content of the water-soluble phenol resin in the binder composition for mold making is preferably 30% by mass or more, more preferably 45% by mass or more, and further preferably 60% by mass or more. preferable. From the viewpoint of improving workability, the content of the water-soluble phenol resin in the mold forming binder composition is preferably 95% by mass or less, more preferably 90% by mass or less, and further 80% by mass or less. preferable. The content of the water-soluble phenol resin in the binder composition for mold making is preferably 30 to 95% by mass from the viewpoint of improving the mold strength and the workability. The mass% is more preferable, and 60-80 mass% is still more preferable.

[Polyamine]
The polyamine is a compound having two or more amine groups in the molecule. The number of amine groups in the polyamine is preferably 3 or less from the viewpoint of reducing nitrogen gas due to thermal decomposition. The number of amine groups in the polyamine is preferably 2 or 3 from the viewpoint of improving the template strength.

  Specific examples of the polyamine include aliphatic polyamines such as ethylenediamine, propylenediamine, butylenediamine, and diethylenetriamine, alicyclic polyamines such as diaminocyclohexane, bis (aminomethyl) cyclohexane, dicyclohexylmethanediamine, and isophoronediamine, and m-xylene. Aromatic polyamines such as diamine, o-xylenediamine, m-phenylenediamine, tolylenediamine and diphenylmethanediamine, heterocyclic polyamines such as piperazine and piperidylmethylamine, alkanolamines such as monoethanolamine, diethanolamine and triethanolamine Can be mentioned.

  From the viewpoint of improving the template strength, the series of amine groups in the polyamine is preferably primary to tertiary, more preferably primary or secondary, and even more preferably primary.

  The molecular weight of the polyamine is preferably 50 or more, more preferably 100 or more, from the viewpoint of improving the template strength. From the viewpoint of improving workability, the molecular weight of the polyamine is preferably 500 or less, more preferably 300 or less, and even more preferably 200 or less. The molecular weight of the polyamine is preferably 50 to 500, more preferably 50 to 300, and still more preferably 100 to 200, from the viewpoint of improving the template strength.

  The content of the polyamine in the binder composition for mold making is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, and more preferably 1% by mass or more from the viewpoint of improving the mold strength. More preferably, 2 mass% or more is still more preferable. From the viewpoint of improving workability, the content of the polyamine in the mold forming binder composition is preferably 30% by mass or less, more preferably 20% by mass or less, and still more preferably 10% by mass or less. The mass% or less is still more preferable. Further, the content of the polyamine in the binder composition for mold making is preferably 0.1 to 30% by mass from the viewpoint of improving the mold strength and the workability. 20 mass% is more preferable, 1-10 mass% is still more preferable, and 2-6 mass% is still more preferable.

  As for the method of adding the polyamine, the phenol resin, the polyamine, and other components may be mixed together, or the polyamine may be added to the phenol resin in advance. When added to the phenol resin, it may be added before the synthesis reaction, may be added during the synthesis reaction, or may be added after the synthesis reaction. From the viewpoint of stabilizing the addition amount, it is preferable to add the binder composition during the synthesis reaction.

[Other ingredients]
[Polyoxyalkylene alkyl ether]
It is preferable that the binder composition for mold making contains a polyoxyalkylene alkyl ether from the viewpoint of improving the mold strength.

  The number of polyoxyalkylene groups in the polyoxyalkylene alkyl ether is preferably 2 or more from the viewpoint of improving the template strength. From the viewpoint of improving workability, the number of polyoxyalkylene groups in the polyoxyalkylene alkyl ether is preferably 30 or less, more preferably 20 or less, and even more preferably 15 or less. In addition, the number of polyoxyalkylene groups in the polyoxyalkylene alkyl ether is preferably 2 to 30, more preferably 2 to 20, and 2 to 15 from the viewpoint of improving the mold strength and the workability. Further preferred.

  The number of repeating units of the alkylene group in the polyoxyalkylene group is preferably 2 or more from the viewpoint of improving the template strength. From the viewpoint of improving workability, the number of repeating units of the alkylene group in the polyoxyalkylene group is preferably 30 or less, more preferably 20 or less, and still more preferably 15 or less. Moreover, the number of repeating units of the alkylene group in the polyoxyalkylene group is preferably 2 to 30, more preferably 2 to 20, and still more preferably 2 to 15 from the viewpoint of improving workability.

  The polyoxyalkylene group is selected from the group consisting of a polyoxyethylene group, a polyoxypropylene group, and a polyoxyalkylene group in which an oxyethylene group and an oxypropylene group are added in block form or randomly from the viewpoint of improving the template strength. One or more species are preferred, and one or more species selected from a polyoxyethylene group and a polyoxypropylene group are more preferred.

  Specific examples of the polyoxyalkylene alkyl ether include polyethylene glycol, tetraethylene glycol, polypropylene glycol, polytetramethylene glycol and the like.

  From the viewpoint of improving the template strength, the average molecular weight of the polyoxyalkylene alkyl ether is preferably 80 or more, more preferably 100 or more, and still more preferably 120 or more. The average molecular weight of the polyoxyalkylene alkyl ether is preferably 1000 or less, more preferably 800 or less, and still more preferably 600 or less, from the viewpoint of improving the template strength. The average molecular weight of the polyoxyalkylene alkyl ether is preferably 80 to 1000, more preferably 100 to 800, and still more preferably 120 to 600, from the viewpoint of improving workability. In addition, the average molecular weight of the said polyoxyalkylene alkyl ether is measured by the method as described in an Example.

  The content of the polyoxyalkylene alkyl ether in the binder composition for mold making is preferably 0.1% by mass or more, more preferably 0.5% by mass or more from the viewpoint of improving the mold strength. More preferably, it is more than mass%. From the viewpoint of improving workability, the content of the polyoxyalkylene alkyl ether in the binder composition for mold making is preferably 50% by mass or less, more preferably 30% by mass or less, and more preferably 10% by mass or less. Further preferred. Moreover, the content of the polyoxyalkylene alkyl ether in the binder composition for mold making is preferably 0.1 to 50% by mass from the viewpoint of improving the mold strength and the workability. 0.5-30 mass% is more preferable, and 1-10 mass% is still more preferable.

  The mass ratio of the polyamine and the polyoxyalkylene alkyl ether (polyamine / polyoxyalkylene alkyl ether) is preferably 1/20 or more, more preferably 1/15 or more, and 1/10 or more from the viewpoint of improving the template strength. Is more preferable. The mass ratio of the polyamine and the polyoxyalkylene alkyl ether is preferably 10/1 or less, more preferably 5/1 or less, and still more preferably 1/1 or less, from the viewpoint of improving the template strength. The mass ratio of the polyamine and the polyoxyalkylene alkyl ether is preferably 1/20 to 10/1, more preferably 1/15 to 5/1, and more preferably 1/10 to 1 from the viewpoint of improving the template strength. / 1 is more preferable.

  From the viewpoint of improving the mold strength, the total content of the polyamine in the binder composition for mold making and the content of the polyoxyalkylene alkyl ether in the binder composition for mold making is 0.1 mass% or more is preferable, 0.5 mass% or more is more preferable, and 1 mass% or more is still more preferable. From the viewpoint of improving the mold strength, the total content of the polyamine in the binder composition for mold making and the content of the polyoxyalkylene alkyl ether in the binder composition for mold making is 50 mass% or less is preferable, 40 mass% or less is more preferable, and 20 mass% or less is still more preferable. The total of the content of the polyamine in the binder composition for mold making and the content of the polyoxyalkylene alkyl ether in the binder composition for mold making is a viewpoint that improves the mold strength. Therefore, 0.1-50 mass% is preferable, 0.5-40 mass% is more preferable, and 1-20 mass% is still more preferable.

  The mold forming binder composition may further contain additives such as water, a silane coupling agent, urea, a surfactant, and alcohols to the extent that the effects of the present embodiment are not impaired. In addition, it is preferable that the binder composition for mold making contains a silane coupling agent because the final strength of the obtained mold can be further improved. Examples of the silane coupling agent include γ- (2-amino) propylmethyldimethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, N- β- (aminoethyl) γ-aminopropylmethyldimethoxysilane and the like can be mentioned. The content of the silane coupling agent in the binder composition for mold making is preferably from 0.1 to 5% by mass, more preferably from 0.3 to 1% by mass, from the viewpoint of improving the mold strength.

<Mold production method>
In the mold manufacturing method of the present embodiment, the mold can be manufactured using the conventional mold manufacturing process as it is. As a preferable method for producing a mold, a mixing step of mixing at least the above-mentioned binder composition for mold making and refractory particles to obtain a mold composition, and filling the mold composition in a mold, the mold composition A method for producing a mold having a curing step for curing an object is mentioned. The mold manufacturing method can suppress a decrease in mold strength even when molding a mold by using recycled sand made of artificial sand as refractory particles and curing a water-soluble phenolic resin with an ester curing agent. .

(Fireproof particles)
As the refractory particles that can be used in the mold production method of the present embodiment, conventionally known particles such as silica sand, chromite sand, zircon sand, olivine sand, alumina sand, mullite sand, and synthetic mullite sand can be used. Recycled sand obtained by collecting used refractory particles and regenerating can also be used, but recycled sand is preferred from the viewpoint of economy and the manifestation of the effect of the method for producing the mold. In particular, from the viewpoint of manifesting the effects of the present embodiment, recycled sand made of artificial sand is preferable, and recycled sand made of artificial sand obtained by a melting method is more preferable. When reclaimed sand is used in the mold manufacturing method, the strength of the mold can be improved as compared with the case of using reclaimed sand in the conventional mold manufacturing method. In addition, a fireproof particle can be used individually or can use 2 or more types together.

  In order to exhibit the effect of the mold production method more effectively, the refractory particles preferably contain 50% by mass or more of recycled sand made of artificial sand obtained by the melting method, and 80% by mass or more. It is more preferable to contain it, and it is still more preferable to contain it at about 100% by mass. Note that “containing at about 100% by mass” means fire resistance other than reclaimed sand made of artificial sand obtained by the melting method. Even if it is a particle, when it is unavoidable, it means that it may be contained if its content is 2% by mass or less.

  As the artificial sand, those obtained by any one of the melting method, the sintering method, and the flame melting method can be used, but those obtained by the melting method from the viewpoint of manifesting the effects of the present embodiment. It is preferable to contain. The artificial sand obtained by the melting method refers to artificial sand obtained by, for example, using a starting material containing alumina and silica, melted by heat, and granulated. In particular, from the viewpoint of fire resistance and productivity, alumina sand containing 40% by weight or more of alumina is preferable, alumina sand containing 55 to 90% by weight of alumina is more preferable, and alumina sand containing 67 to 90% by weight of alumina. Is more preferable.

  Examples of the method for granulating the melt of the starting material include a method of spraying the melt, a method of spraying air on the melt, and the like. In other words, the melt is air-crushed into particles having a predetermined particle size distribution in the air, and after the air crushing, it becomes casting sand (refractory particles) having a predetermined surface area by the surface tension of the molten particles themselves. The melting method is not particularly limited, and it can be melted by an arc furnace, a crucible furnace, an induction electric furnace (high frequency furnace, low frequency furnace, etc.), resistance electric furnace, reflection furnace, rotary furnace, vacuum melting furnace, cupola furnace, etc. it can. Or you may use the method (flame melting method) which melt | dissolves a starting raw material in a flame and spheroidizes.

  The starting material can be selected from, for example, mineral raw materials and synthetic materials having fire resistance. For example, examples of the alumina source include bauxite, van earth shale, aluminum oxide, aluminum hydroxide and the like. Examples of the silica source include silica, silica sand, quartz, cristobalite, amorphous silica, feldspar, pyrophyllite and the like. Examples of the alumina source and the silica source include kaolin, van earth shale, bauxite, mica, sillimanite, andalusite, mullite, zeolite, montmorillonite, and hyrosite. These starting materials can be used alone or in admixture of two or more.

  The reclaimed sand is sand obtained by regenerating at least once by a general reclaiming method (wet, dry, thermal, etc.) after the casting is produced with a mold made using a water-soluble phenol resin. However, a product regenerated by a dry method (especially a wear method) has a high yield and is economically preferable. Moreover, you may reproduce | regenerate combining these reproduction | regeneration methods.

  In the curing step, a known general method can be used as a method of curing the mold composition. In particular, from the viewpoint of manifesting the effects of the present embodiment, a curing agent is mixed with the mold composition, and the mold forming binder composition is cured with the curing agent, and gas is aerated. A gas curing mold making method is preferred in which the binder composition for mold making is cured.

  In the self-hardening mold making method, at least the binder composition for mold making, the refractory particles, and a curing agent are mixed in the mixing step. The curing agent can be used without particular limitation as long as it cures the binder composition for mold making, but an ester compound is preferable from the viewpoint of improving the mold strength.

  The ester compound that can be used in the self-hardening mold making method is a conventionally known ester compound that can be used as a curing agent for a water-soluble phenol resin. Examples of the ester compound include lactones or mono- or polyhydric alcohols having 1 to 10 carbon atoms and organic ester compounds derived from organic carboxylic acids having 1 to 10 carbon atoms, but improve the template strength. From the viewpoint, it is preferable to use γ-butyrolactone, propionlactone, ε-caprolactone, ethyl formate, ethylene glycol diacetate, ethylene glycol monoacetate, triacetin and the like in the self-hardening template molding method.

  The ratio of the refractory particles, the binder composition and the curing agent in the self-hardening mold making method can be appropriately set, but from the viewpoint of improving the mold strength, with respect to 10,000 parts by weight of the refractory particles, The binder composition is preferably 50 parts by mass or more, and preferably 300 parts by mass or less. From the viewpoint of improving the final strength of the mold, the curing agent is preferably 10 parts by mass or more and preferably 80 parts by mass or less with respect to 10,000 parts by mass of the refractory particles.

  In the gas curing mold making method, the mold composition is filled in a mold for gas in the curing step, and the mold composition is cured by aeration of gas. The gas can be used without any particular limitation as long as it cures the mold composition, but an ester compound or carbon dioxide gas is preferred from the viewpoint of improving the mold strength.

  The ester compound that can be used in the gas curing mold making method is a conventionally known ester compound that can be used as a curing agent for a water-soluble phenol resin. The ester compound used in the gas curing mold making method is preferably methyl formate from the viewpoint of improving the mold strength.

  When carbon dioxide gas is used as a curing agent, an oxyanion compound that is a boric acid compound such as borax or boric acid is indispensable. This is because it is considered that the ionomer is formed only after the oxyanion compound absorbs carbon dioxide gas, and the water-soluble phenol resin is polymerized. Borates such as boric acid and sodium tetraborate decahydrate (borax), potassium tetraborate decahydrate, sodium metaborate, sodium pentaborate and potassium pentaborate are preferred. The addition amount of the oxyanion compound is 1 to 20 parts by mass, preferably 5 to 10 parts by mass with respect to 100 parts by mass of the water-soluble phenol resin from the viewpoint of the curing rate and strength of the mold. Other oxyanion compounds include aluminates, stannates, and the like.

  The ratio of the refractory particles, the binder composition, and the gas in the gas curing mold making method can be appropriately set. However, when an ester compound is used as the gas, the refractory particles 10000 is used from the viewpoint of improving the mold strength. The binder composition is preferably 50 parts by mass or more and more preferably 80 parts by mass or less with respect to parts by mass. When carbon dioxide is used as the gas, the binder composition is preferably 50 parts by mass or more and 80 parts by mass or less with respect to 10000 parts by mass of the refractory particles from the viewpoint of improving mold strength.

  In the mixing step, as a method of mixing the raw materials, a known general method can be used, for example, a method of adding each raw material by a batch mixer and kneading, or a method of supplying each raw material to a continuous mixer and kneading. The method of doing is mentioned.

  Examples and the like specifically showing the present invention will be described below.

<Examples 1-9, Comparative Examples 1-8>
(Fireproof particles)
[Adjustment of fresh sand]
As the new sand, ESPARL # 60L (manufactured by Yamakawa Sangyo Co., Ltd.) was used.

[Preparation of recycled sand]
Water-soluble phenolic resin ("Kaorustep SH-8010" manufactured by Kao Quaker) and ester compound-based curing agent against new sand of artificial alumina sand ("Espearl # 60L" manufactured by Yamakawa Sangyo Co., Ltd.) manufactured by the melting method Triacetin was added as a mold, and a mold was formed using kneaded sand obtained by kneading these. After casting using the obtained mold, the regenerated sand was used as reclaimed sand.

(Preparation of water-soluble phenol resin)
In a 2 liter glass container equipped with a thermometer and a stirrer, 773 g of phenol, 190 g of 48.5 mass% potassium hydroxide aqueous solution and 323 g of water were mixed and heated to 82 ° C. Thereafter, 937 g of a 50% formalin solution was added and reacted at 82 ° C. to obtain a phenol-formaldehyde modified resin having a weight average molecular weight of about 3000.

(Preparation of binder composition)
The phenol-formaldehyde modified resin, water, 48.5 mass% potassium hydroxide aqueous solution, 48.5 mass% sodium hydroxide aqueous solution, sodium aluminate, 3-glycidoxypropyltrimethoxysilane (KBM- manufactured by Shin-Etsu Chemical Co., Ltd.) 403) and an amine compound and an ether compound described in Table 1 were mixed at a mass ratio described in Table 1 to obtain a binder composition.

〔Evaluation method〕
[Weight average molecular weight (Mw) of water-soluble phenol resin]
The weight average molecular weight (Mw) of the water-soluble phenol resin was measured by GPC (gel permeation chromatography) under the following conditions.
(A) Sample preparation: Ion exchange water of the same weight was added to the sample, and 0.1% by mass of H ₂ SO ₄ was added for neutralization. The produced precipitate was separated by filtration, washed with water and dried. This was dissolved in tetrahydrofuran (THF) to prepare a sample for GPC.
(B) Column: One guard column TSX (manufactured by Toyo Soda Industry Co., Ltd.) HXL (6.5 mmφ × 4 cm), one TSK3000HXL (7.8 mmφ × 30 cm), and one TSK2500HXL (7.8 mmφ × 30 cm) use. The guard column-3000HXL-2500HXL was connected in this order from the inlet side.
(C) Standard substance: monodispersed polystyrene (made by Toyo Soda Kogyo Co., Ltd.) having a known weight average molecular weight
(D) Eluent: THF (flow rate: 1 cm ³ / min)
(E) Column temperature: 25 ° C
(F) Detector: UV spectrophotometer (determined at the wavelength of the maximum peak of phenol UV absorption)
(G) Division method for molecular weight calculation: time division (2 sec)

  The molecular weight of 1 mol of polyoxyalkylene alkyl ether was determined by dividing 56.1 (molecular weight of potassium hydroxide) by the hydroxyl value (mg / KOHg) determined by JIS K0070.

[Mold compression strength]
A test piece (50 mm × 50 mmφ) molded using a mold composition obtained by kneading 100 parts by mass of a binder composition and 25 parts by mass of γ-butyrolactone with respect to 10,000 parts by mass of refractory particles. The compressive strength after 24 hours was measured. The compression speed was 5 mm / sec, and the compression strength was calculated from the load / cross-sectional area of the test piece. The measurement results of each example and comparative example are shown in Table 1. The atmospheric temperature when casting the mold composition and the atmospheric temperature when evaluating the compressive strength were set to 5 ° C. and 55% RH. The temperature of the mold composition at the time of molding was the same as the ambient temperature at the time of molding.

  The results of each example and comparative example are shown in Table 1.

Claims (9)

Containing a water-soluble phenolic resin, a polyamine, and a polyoxyalkylene alkyl ether;
The polyamine is one or more selected from the group consisting of an aliphatic polyamine, an alicyclic polyamine, an aromatic polyamine, a heterocyclic polyamine, and an alkanolamine;
Wherein the aliphatic polyamine is ethylenediamine, propylene diamine, butylene diamine, diethylene triamine, and binder composition for mold formation is at least one selected from the group consisting of hexamethylenediamine.   The binder composition for mold making according to claim 1, wherein the number of amine groups in the polyamine is 2 or 3.   3. The binder composition for mold making according to claim 1, wherein the content of the polyamine is 0.1% by mass or more and 30% by mass or less.   The binder composition for mold making according to any one of claims 1 to 3, wherein the polyoxyalkylene group in the polyoxyalkylene alkyl ether is a polyoxyethylene group or a polyoxypropylene group.   The number of polyoxyalkylene group in the said polyoxyalkylene alkyl ether is 2-30, The binder composition for mold making of any one of Claims 1-4.   The caking for mold making according to any one of claims 1 to 5, wherein a mass ratio of the polyamine to the polyoxyalkylene alkyl ether (polyamine / polyoxyalkylene alkyl ether) is from 1/20 to 10/1. Agent composition.   The binder for mold making according to any one of claims 1 to 6, wherein the total content of the polyamine and the content of the polyoxyalkylene alkyl ether is 0.1 mass% or more and 50 mass% or less. Composition.   Mixing step of mixing the binder composition for mold making according to any one of claims 1 to 7 and refractory particles to obtain a mold composition, and filling the mold composition in a mold, The manufacturing method of the casting_mold | template which has a hardening process which hardens the said composition for casting_mold | templates. The method for producing a mold according to claim 8, wherein the curing agent that cures the mold composition in the curing step is an organic ester or carbon dioxide gas.