JP5630908B2 - Method for producing mold composition - Google Patents

Description

  The present invention relates to a method for producing a mold composition, a method for producing a mold, and a binder composition.

  Self-hardening molds, especially acid-hardening self-hardening molds, include self-hardening mold-forming binder compositions containing acid-hardening resins such as furan resin in refractory particles such as silica sand, phosphoric acid, organic It is manufactured by adding a curing agent containing sulfonic acid, sulfuric acid and the like, kneading them, filling the obtained kneaded sand into a mold such as a wooden mold, and curing the acid curable resin.

  Examples of the furan resin include furfuryl alcohol, furfuryl alcohol / urea formaldehyde resin, furfuryl alcohol / formaldehyde resin, furfuryl alcohol / phenol / formaldehyde resin, and other known modified furan resins.

  As a binder composition containing an acid curable resin, it is described in Patent Document 1 below that a specific perfume component is added to a furan resin in order to mask a bad odor generated when a mold or a casting is produced. A binder composition containing 005 to 1.5% by weight is disclosed.

JP-A-5-212488

  As a condition for improving the productivity of the acid curable mold, the deep part curability is good. Deep-part curability refers to the curing performance of a portion that is not exposed to the outside air (for example, a portion that is in contact with the prototype) when the prototype is filled with kneaded sand. Since the curing reaction of the acid curable resin proceeds by a dehydration condensation reaction, the curing of the deep portion of the mold that is not exposed to the outside air is considered to be slow because the reaction water is not easily removed. The contact portion with the original mold such as a wooden mold, which corresponds to the deep portion of the mold, is important because it is a portion that usually forms the surface of the casting. Accordingly, there is a demand for a binder composition that not only cures quickly but can be sufficiently cured to the deep part, that is, has good deep part curability.

  However, in the case of producing a mold using the binder composition of Patent Document 1, the deep mold curability of the mold is not sufficient, and depending on the conditions, it is difficult to improve productivity because the mold deep cure is slow. Met.

  The present invention provides a method for producing a mold composition, a method for producing a mold, and a binder composition that can improve the mold curing rate and improve the deep curability of the mold.

（式中、ＸはＣＨＯ又はＣＨ_２ＯＨである。） The method for producing a mold composition of the present invention includes a step of preparing a mixture containing refractory particles, a binder composition containing an acid curable resin, and a curing agent, and the mixture includes: It is a manufacturing method of the composition for casting_mold | templates which contains the vanillin type compound represented by following General formula (1) 2.0-15.0 weight part with respect to 100 weight part of said acid curable resins.

(Wherein X is CHO or CH ₂ OH)

  Moreover, the manufacturing method of the casting_mold | template of this invention is a manufacturing method of a casting_mold | template which has the process of hardening the casting_mold | template composition obtained by the manufacturing method of the casting_mold | template composition of the said invention.

（式中、ＸはＣＨＯ又はＣＨ_２ＯＨである。） The binder composition of the present invention is a binder composition containing an acid curable resin, and a vanillin compound represented by the following general formula (1) is added to the acid curable resin 100 weight. It is a binder composition containing 2.0-15.0 weight part with respect to a part.

(Wherein X is CHO or CH ₂ OH)

  According to the method for producing a mold composition, the method for producing a mold, and the binder composition of the present invention, it is possible to improve the mold curing speed and to improve the deep curability of the mold.

  The method for producing a mold composition of the present invention includes a step of preparing a mixture containing refractory particles, a binder composition containing an acid curable resin, and a curing agent, and the mixture includes: It is a manufacturing method of the composition for casting_mold | templates containing the said predetermined amount the vanillin type compound (henceforth a vanillin type compound (1)) represented by the said General formula (1). Hereinafter, the components contained in the mold composition obtained by the production method of the present invention will be described.

≪Binder composition≫
The binder composition used in the present invention contains an acid curable resin.

<Acid curable resin>
Examples of the acid curable resin include furfuryl alcohol, furfuryl alcohol and aldehyde condensate, phenol and aldehyde condensate, melamine and aldehyde condensate, and urea and aldehyde condensate. What consists of 1 type chosen from a group, and what consists of 2 or more types of mixtures chosen from these groups can be used. Moreover, what consists of 2 or more types of cocondensates chosen from the said group and what consists of a mixture of 1 or more types chosen from the said group and the said cocondensates can also be used. Among these, from the viewpoint of improving the deep curability and the resin viscosity, condensates of furfuryl alcohol, phenols and aldehydes, condensates of furfuryl alcohol, melamine and aldehydes, and furfuryl alcohol, urea and aldehydes. The furan resin which consists of 1 type chosen from the group which consists of these condensates, or the furan resin which consists of 2 or more types of mixtures chosen from these groups is preferable. Further, from the viewpoint of reducing the amount of formaldehyde generated during molding and improving the mold strength, a condensate of furfuryl alcohol, urea, and aldehydes is preferable. Further, from the viewpoint of adjusting the viscosity of the binder composition to an appropriate range, the acid curable resin preferably contains furfuryl alcohol.

  Examples of the aldehydes include formaldehyde, acetaldehyde, glyoxal, furfural, terephthalaldehyde, and the like, and one or more of these can be used as appropriate. From the viewpoint of improving the mold strength, it is preferable to use formaldehyde, and from the viewpoint of reducing the amount of formaldehyde generated during molding, it is preferable to use furfural or terephthalaldehyde.

  Examples of the phenols include phenol, cresol, resorcin, bisphenol A, bisphenol C, bisphenol E, and bisphenol F, and one or more of these can be used.

  When manufacturing the condensate of furfuryl alcohol and aldehydes, it is preferable to use 0.01-1 mol of aldehydes with respect to 1 mol of furfuryl alcohol. Moreover, when manufacturing the condensate of phenols and aldehydes, it is preferable to use 1-3 mol of aldehydes with respect to 1 mol of phenols. Moreover, when manufacturing the condensate of a melamine and aldehydes, it is preferable to use 1-3 mol of aldehydes with respect to 1 mol of melamine. Moreover, when manufacturing the condensate of urea and aldehydes, it is preferable to use 1.0-2.0 mol of aldehydes with respect to 1 mol of urea, and 1.5-2.0 mol is used. It is more preferable to use 1.7 to 2.0 mol.

  When producing a condensate of furfuryl alcohol, aldehydes and urea, it is preferable to condense furfuryl alcohol, urea and aldehydes in the presence of an acid catalyst, and 0 mol of aldehydes per mole of furfuryl alcohol. It is preferable to use 0.05 to 3 mol and 0.03 to 1.5 mol of urea.

  The content of the acid curable resin in the binder composition is preferably 50 to 99% by weight, more preferably 55 to 99% by weight, and still more preferably, from the viewpoint of improving the final mold strength. Is 60 to 99% by weight.

  In particular, when the acid curable resin contains furfuryl alcohol, the content of furfuryl alcohol in the binder composition is preferably 25 from the viewpoint of adjusting the viscosity of the binder composition to an appropriate range. It is -98 weight%, More preferably, it is 30-98 weight%, More preferably, it is 35-98 weight%.

  Further, the viscosity of the binder composition is preferably low from the viewpoint of preventing kneading unevenness and uniform expression of mold strength. From the above viewpoint, the viscosity of the binder composition at 25 ° C. measured with an E-type viscometer is preferably 1 to 80 mPa · s, more preferably 5 to 60 mPa · s, and still more preferably 8 to 40 mPa · s.

  In a binder composition obtained from a compound having an amino group (for example, urea, etc.), it is considered that the amino group forms a cross-linking bond with the resin component, and has a favorable influence on the flexibility of the obtained template. Is done. The amino group content can be estimated by the nitrogen content (% by weight). Note that the flexibility of the mold is necessary when the mold is removed from the original mold. In particular, when a mold having a complicated shape is formed, if the mold has high flexibility, it is possible to prevent mold cracks caused by stress concentration at a portion where the thickness of the mold is thin at the time of mold removal. In the binder composition used in the present invention, the nitrogen content in the binder composition is 0.8% by weight or more from the viewpoint of preventing cracking of the obtained mold and improving the final mold strength. Preferably, it is 2.0% by weight or more, more preferably 2.2% by weight or more, still more preferably 2.3% by weight or more, and 2.5% by weight. It is still more preferable that it is% or more. Further, from the viewpoint of preventing gas defects due to nitrogen in the casting, the nitrogen content in the binder composition is preferably 4.0% by weight or less, more preferably 3.8% by weight or less. Preferably, it is 3.7% by weight or less, more preferably 3.6% by weight or less. Taking the above viewpoints together, the nitrogen content in the binder composition is preferably 0.8 to 4.0% by weight, more preferably 2.0 to 4.0% by weight. More preferably, it is from 2 to 3.8% by weight, even more preferably from 2.3 to 3.7% by weight, and even more preferably from 2.5 to 3.6% by weight. In order to adjust the nitrogen content in the binder composition within the above range, the content of the nitrogen-containing compound in the binder composition may be adjusted. As the nitrogen-containing compound, urea, melamine, a condensate of urea and aldehydes, a condensate of melamine and aldehydes, a urea resin, a urea-modified resin, and the like are preferable. The nitrogen content in the binder composition can be quantified by the Kjeldahl method. Furthermore, nitrogen content derived from urea, urea resin, furfuryl alcohol / urea resin (urea modified resin), and furfuryl alcohol / urea formaldehyde resin is 13C-NMR for carbonyl group (C═O group) derived from urea. It can also be determined by quantifying with. From the viewpoint of improving deep part curability, the nitrogen content in the binder composition is preferably 2.0 to 4.0% by weight, more preferably 3.0 to 4.0% by weight. preferable.

  The content of the binder composition in the mold composition is preferably 0.4 to 5.0% by weight, more preferably 0.6 to 3.0% by weight from the viewpoint of improving the mold strength, and 0.8 to More preferred is 2.0% by weight.

<Vanillin compound (1)>
The composition for a mold obtained by the production method of the present invention comprises a vanillin compound (1) represented by the general formula (1) from the viewpoint of improving the curing rate of the mold and improving the deep curability of the mold. contains.

  Examples of the vanillin compound (1) include vanillin, o-vanillin, iso-vanillin, vanillyl alcohol, ethyl vanillin and the like. From the viewpoint of improving the mold curing speed and the mold deep curing property, vanillin O-vanillin, iso-vanillin and vanillyl alcohol are preferred. Among these, o-vanillin and iso-vanillin are more preferable from the viewpoint of improving the mold curing rate, and o-vanillin and vanillyl alcohol are more preferable from the viewpoint of improving the deep curability of the mold.

  The composition for a mold obtained by the production method of the present invention contains a vanillin compound (1) with respect to 100 parts by weight of the acid curable resin from the viewpoint of improving the curing rate of the mold and improving the deep curability of the mold. Contains 2.0 parts by weight or more. From the same viewpoint, the content of the vanillin compound (1) is preferably 2.5 parts by weight or more, more preferably 3.0 parts by weight or more, and 4.0 parts by weight or more. Is more preferable. Further, from the viewpoint of improving the mold curing speed and finally improving the mold strength, the content of the vanillin compound (1) in the mold composition is 15 with respect to 100 parts by weight of the acid curable resin. 0 parts by weight or less, preferably 10.0 parts by weight or less, more preferably 8.0 parts by weight or less, and still more preferably 6.0 parts by weight or less. When these viewpoints are put together, the vanillin compound (1) is 2.0 to 15.0 parts by weight with respect to 100 parts by weight of the acid curable resin in the mold composition, and 2.5 to 10.0. The amount is preferably part by weight, more preferably 3.0 to 8.0 parts by weight, and still more preferably 4.0 to 6.0 parts by weight.

  In addition, the mold composition obtained by the production method of the present invention contains the vanillin compound (1) content in the mold composition from the viewpoint of improving the mold curing rate and improving the deep moldability of the mold. Is preferably 0.01% by weight or more, more preferably 0.015% by weight or more, and still more preferably 0.02% by weight or more. In addition, from the viewpoint of improving the mold curing speed and the final mold strength, the content of the vanillin compound (1) in the mold composition is preferably 0.15 wt% or less, It is more preferably 0.12% by weight or less, and further preferably 0.088% by weight or less. Taking these viewpoints together, the vanillin compound (1) is preferably 0.01 to 0.15% by weight, more preferably 0.015 to 0.12% by weight, in the template composition. Preferably, it is 0.02 to 0.088% by weight.

  The vanillin compound (1) may be previously contained in the binder composition from the viewpoint of improving the curing rate of the mold, from the viewpoint of improving the deep part curability of the mold, and from the viewpoint of facilitating blending. That is, the binder composition of the present invention contains an acid curable resin and a vanillin compound (1), and the content of the vanillin compound (1) is 2. with respect to 100 parts by weight of the acid curable resin. It is a binder composition which is 0-15.0 weight part. The preferable range of the content of the vanillin compound (1) with respect to 100 parts by weight of the acid curable resin is the same as that in the mold composition.

<Curing accelerator>
The binder composition used in the present invention may contain a curing accelerator from the viewpoint of preventing cracking of the mold and improving the mold strength. The curing accelerator is preferably one or more selected from the group consisting of a compound represented by the following general formula (2), a phenol derivative, an aromatic dialdehyde, and tannins from the viewpoint of improving the mold strength.

〔式中、Ｘ₁及びＸ₂は、それぞれ水素原子、ＣＨ₃又はＣ₂Ｈ₅の何れかを表す。〕

[Wherein, X ₁ and X ₂ each represent a hydrogen atom, CH ₃ or C ₂ H ₅ . ]

  Examples of the compound represented by the general formula (2) include 2,5-bishydroxymethylfuran, 2,5-bismethoxymethylfuran, 2,5-bisethoxymethylfuran, and 2-hydroxymethyl-5-methoxymethyl. Examples include furan, 2-hydroxymethyl-5-ethoxymethyl furan, and 2-methoxymethyl-5-ethoxymethyl furan. Among these, 2,5-bishydroxymethylfuran is preferably used from the viewpoint of improving the mold strength. The content of the compound represented by the general formula (2) in the binder composition improves the viewpoint of solubility of the compound represented by the general formula (2) in the acid curable resin and the mold strength. From the viewpoint, it is preferably 0.5 to 63% by weight, more preferably 1.8 to 50% by weight, still more preferably 2.5 to 50% by weight, and 3.0 to 40% by weight. % Is even more preferred.

  Examples of the phenol derivative include resorcin, cresol, hydroquinone, phloroglucinol, methylene bisphenol, and the like. Of these, resorcin is preferable from the viewpoint of improving the deep curability of the mold and improving the mold strength. The content of the phenol derivative in the binder composition is preferably 1 to 25% by weight from the viewpoint of the solubility of the phenol derivative in the acid curable resin and the improvement of the mold strength. It is more preferably 15% by weight, and further preferably 3 to 10% by weight. In particular, when resorcin is used, the content of resorcin in the binder composition is determined in terms of the solubility of resorcin in the acid curable resin, the viewpoint of improving the deep curability of the mold, and the final mold strength. From the viewpoint of improvement, it is preferably 1 to 10% by weight, more preferably 2 to 7% by weight, and further preferably 3 to 6% by weight.

  Examples of the aromatic dialdehyde include terephthalaldehyde, phthalaldehyde, isophthalaldehyde, and derivatives thereof. These derivatives mean compounds having a substituent such as an alkyl group on the aromatic ring of an aromatic compound having two formyl groups as the basic skeleton. From the viewpoint of preventing cracking of the mold, terephthalaldehyde and terephthalaldehyde derivatives are preferable, and terephthalaldehyde is more preferable. The content of the aromatic dialdehyde in the binder composition is preferably from the viewpoint of sufficiently dissolving the aromatic dialdehyde in the acid curable resin and suppressing the odor of the aromatic dialdehyde itself. It is 1 to 15% by weight, more preferably 0.5 to 10% by weight, and further preferably 1 to 5% by weight.

  Examples of tannins include condensed tannins and hydrolyzed tannins. Examples of these condensed tannins and hydrolyzed tannins include tannins having a pyrogallol skeleton and a resorcin skeleton. Moreover, you may add the extract from natural products, such as a leaf bark extract containing these tannins, and a leaf derived from a plant, a fruit, a seed | species, and a worm hump parasitic on a plant.

<Water>
The binder composition used in the present invention may further contain water. For example, when synthesizing various condensates such as a condensate of furfuryl alcohol and aldehydes, an aqueous raw material is used or condensed water is generated. Therefore, the condensate is usually in the form of a mixture with water. It is obtained by. When using such a condensate in a binder composition, moisture may be removed by topping, etc., if necessary. However, as long as the curing reaction rate can be maintained, it is necessary to remove it during production. There is no. Further, water may be further added for the purpose of adjusting the binder composition to a viscosity that is easy to handle. However, if water is excessive, the curing reaction of the acid curable resin may be inhibited. Therefore, the water content in the binder composition is preferably in the range of 0.5 to 30% by weight from the viewpoint of making the binder composition easy to handle and maintaining the initial mold strength. A range of 5 to 25% by weight is more preferable. Furthermore, it is preferably 5 to 10% by weight from the viewpoint of improving the final mold strength. Further, from the viewpoint of improving deep part curability, the content of water is preferably 5 to 25% by weight.

<Other additives>
The binder composition used in the present invention may further contain an additive such as a silane coupling agent. For example, it is preferable that a silane coupling agent is included because the final mold strength can be improved. Examples of silane coupling agents include N-β (aminoethyl) γ-aminopropylmethyldimethoxysilane, N-β (aminoethyl) γ-aminopropyltrimethoxysilane, N-β (aminoethyl) γ-aminopropyltriethoxy. Aminosilanes such as silane, 3-aminopropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 3-glycidoxy Epoxy silanes such as propyltriethoxysilane, ureido silane, mercapto silane, sulfide silane, methacryloxy silane, acryloxy silane and the like are used. Amino silane, epoxy silane, and ureido silane are preferable. The content of the silane coupling agent in the binder composition is preferably 0.01 to 0.5% by weight, and 0.05 to 0.3% by weight from the viewpoint of improving the final mold strength. % Is more preferable.

≪Fireproof particles≫
As the refractory particles, 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 ones can also be used. The content of the refractory particles in the mold composition is preferably 91.5 to 99.5% by weight, more preferably 95 to 99% by weight, and still more preferably 97 to 98.8% by weight.

≪Curing agent≫
Examples of the curing agent include xylene sulfonic acid (for example, m-xylene sulfonic acid), toluene sulfonic acid (for example, p-toluene sulfonic acid), sulfonic acid compounds such as methane sulfonic acid, phosphoric acid, acidic phosphoric acid ester, and the like. One or more conventionally known compounds such as phosphoric acid compounds and sulfuric acid can be used as an aqueous solution, for example. Further, the curing agent may contain one or more solvents selected from the group consisting of alcohols, ether alcohols and esters, and carboxylic acids. Among these, from the viewpoint of improving the final mold strength, the alcohols and the ether alcohols are preferably contained, and the ether alcohols are more preferably contained. Further, when the curing agent contains the solvent or the carboxylic acid, the amount of water in the curing agent can be kept low, and the final mold strength is further improved. The content of the solvent and the carboxylic acids in the curing agent is preferably 5 to 50% by weight, more preferably 10 to 40% by weight, from the viewpoint of improving the final mold strength.

  From the viewpoint of improving the final mold strength, the alcohols are preferably propanol, butanol, pentanol, hexanol, heptanol, octanol, and benzyl alcohol. The ether alcohols are ethylene glycol monoethyl ether, ethylene glycol. Monobutyl ether, ethylene glycol monohexyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol monohexyl ether, diethylene glycol monophenyl ether, ethylene glycol monophenyl ether are preferred, and esters include butyl acetate, butyl benzoate, ethylene glycol Monobutyl ether acetate, diethylene glycol monobutyl ether Le acetate is preferred. Moreover, it is preferable to contain methanol and ethanol from a viewpoint of reducing the viscosity of a hardening | curing agent composition, and a viewpoint of the storage stability improvement of a hardening | curing agent composition. As the carboxylic acids, a carboxylic acid having a hydroxyl group is preferable, and lactic acid, citric acid, and malic acid are more preferable from the viewpoint of improving the final template strength and reducing odor. The content of the curing agent in the mold composition is preferably 0.12 to 3.5% by weight, more preferably 0.2 to 1.0% by weight, and 0.3 to 0% from the viewpoint of improving the mold strength. More preferably, 6% by weight.

  The method for producing a mold composition of the present invention includes, for example, adding a binder composition and a curing agent for curing the binder composition to refractory particles, and using a batch mixer or a continuous mixer. It has the process of preparing a mixture by kneading | mixing. At this time, it is preferable to add the binder composition after adding the curing agent to the refractory particles. When the binder composition contains the vanillin compound (1), the vanillin compound (1) is supplied to the mixture by the above method and contained in the final template composition. . That is, when the vanillin compound (1) is blended in advance in the binder composition, when the binder composition and the refractory particles and the curing agent are mixed, the vanillin compound ( It is presumed that 1) is blended uniformly and contributes to an improvement in the mold curing speed and an improvement in the deep part curability of the mold. Moreover, in the manufacturing method of this invention, when obtaining the composition for casting_mold | template, you may use the binder composition which does not contain a vanillin type compound (1). In that case, the vanillin compound (1) may be separately added to the refractory particles or the like when the binder composition is added to the refractory particles or before or after the addition.

  The ratio of the refractory particles, the binder composition, and the curing agent in the mold composition can be set as appropriate, but the binder composition is 0.5 to 1.5 weights with respect to 100 parts by weight of the refractory particles. Part and the curing agent is preferably in the range of 0.07 to 1 part by weight. With such a ratio, it is easy to obtain a mold having sufficient strength. Furthermore, the content of the curing agent is 10 to 10 parts by weight with respect to 100 parts by weight of the acid curable resin in the binder composition from the viewpoint of reducing the amount of water contained in the mold as much as possible and the mixing efficiency in the mixer. The amount is preferably 40 parts by weight, more preferably 15 to 35 parts by weight, and still more preferably 18 to 25 parts by weight.

≪Mold manufacturing method≫
The mold composition obtained by the production method of the present invention can be obtained, for example, by applying a process of a conventional mold production method and curing under a desired condition. That is, the mold production method of the present invention is a mold production method using the above-described mold composition of the present invention as a mold composition to be cured.

  Examples that specifically illustrate the present invention will be described below. The evaluation items in the examples were measured as follows.

<Nitrogen content of binder composition>
Measurement was performed by the Kjeldahl method shown in JIS M 8813.

<Deep hardness>
Immediately after preparation of the mold composition, it is put into a polypropylene cup having an upper diameter of 150 mm, a lower diameter of 120 mm, and a height of 170 mm. When the mold compressive strength described in JIS Z 2604-1976 reaches 0.3 MPa, the polypropylene cup The mold was taken out of the mold, and the surface hardness of the deep part of the mold (the surface that was in contact with the bottom of the polypropylene cup) was measured with a surface hardness meter for furan mold (manufactured by Nakayama). In addition, the value of the deep part hardness shown in Table 1 is the value of the scale (unitless) indicated by the surface hardness tester for furan mold, and the deeper part curability becomes better as the numerical value is larger.

<Mold compression strength after 30 minutes>
Immediately after preparation of the mold composition under conditions of 25 ° C. and 55% RH, it was filled into a cylindrical test piece frame having a diameter of 50 mm and a height of 50 mm, left for 30 minutes, then removed from the mold, and JIS Z 2604- The mold compression strength was measured by the method described in 1976, and the obtained value was defined as the mold compression strength (MPa) after 30 minutes. It can be evaluated that the higher the mold compression strength after 30 minutes, the higher the mold curing rate.

<Mold compression strength after 24 hours>
Immediately after preparation, the mold composition was filled into a cylindrical test piece frame having a diameter of 50 mm and a height of 50 mm. After leaving for 5 hours from immediately after filling under conditions of 25 ° C. and 55% RH, the mold was removed, and after leaving for 19 hours after being released under conditions of 25 ° C. and 55% RH, it was described in JIS Z 2604-1976. The mold compressive strength was measured by the method described above, and the obtained measured value was defined as the mold compressive strength (MPa) after 24 hours. It can be evaluated that the final mold strength is higher as the mold compressive strength after 24 hours is higher.

(Preparation of binder composition)
Example 1
To 54.0 g of furan resin 1 (see footnote in Table 1), 40.9 g of furfuryl alcohol, 5.0 g of vanillin and 0.1 g of a silane coupling agent (Shin-Etsu Silicone, KBM-602) are added. The mixture was stirred and mixed to prepare a binder composition. The nitrogen content in the obtained binder composition was 2.7% by weight.

(Examples 2-7 and Comparative Examples 1-5)
A binder composition was prepared in the same manner as in Example 1 except that the amounts of furfuryl alcohol and vanillin compound (1) were changed. The nitrogen content in the obtained binder composition was 2.7% by weight.

(Preparation of composition for mold)
Under the conditions of 25 ° C. and 55% RH, with respect to 100 parts by weight of the regenerated furanized sand, a curing agent [Kaulight Quarker Kaolitener curing agent TK-3 and Kao Quaker Kaolitener curing agent F-9 Mixture (weight ratio is TK-3 / F-9 = 35/5)] is added 0.36 part by weight, and then 0.90 part by weight of the binder composition is added and mixed to obtain a mold. A composition was obtained. About the obtained composition for casting_mold | template, each item was evaluated by the method mentioned above. The results are shown in Table 1. In addition, as said furan reproduction | regeneration siliceous sand, the thing of the weight reduction | decrease rate (LOI) when heated at 1000 degreeC for 1 hour in the air was used for 1.4 weight%.

  As shown in Table 1, in the Examples, good results were obtained in any evaluation items. On the other hand, the comparative example was significantly inferior to the example for at least one evaluation item. From this result, according to the present invention, it was confirmed that the curing rate of the mold can be improved and the deep curability of the mold can be improved.

Claims (5)

Having a step of preparing a mixture containing a refractory particle, a binder composition containing an acid curable resin, and a curing agent;
The mixture contains 2.0 to 15.0 parts by weight of a vanillin compound represented by the following general formula (1) with respect to 100 parts by weight of the acid curable resin ,
Wherein the curing agent, sulfonic acid compounds, phosphoric acid compounds, Ru der least one member selected from the group consisting of sulfuric acid, and carboxylic acids, method for producing a foundry composition.

(Wherein X is CHO or CH ₂ OH)   2. The mold according to claim 1, further comprising the step of preparing the binder composition by mixing 100 parts by weight of the acid curable resin and 2.0 to 15.0 parts by weight of the vanillin compound in advance. A method for producing the composition.   The method for producing a template composition according to claim 1 or 2, wherein the vanillin compound is at least one selected from vanillin, o-vanillin, iso-vanillin and vanillyl alcohol.   The manufacturing method of a casting_mold | template which has a process of hardening the composition for casting_mold | template obtained with the manufacturing method of the composition for casting_mold | template of any one of Claims 1-3. A binder composition containing an acid curable resin used together with one or more curing agents selected from the group consisting of sulfonic acid compounds, phosphoric acid compounds, sulfuric acid, and carboxylic acids, and having the following general formula ( A binder composition containing 2.0 to 15.0 parts by weight of the vanillin compound represented by 1) with respect to 100 parts by weight of the acid curable resin.

(Wherein X is CHO or CH ₂ OH)