WO2011078082A1 - 自硬性鋳型造型用粘結剤組成物 - Google Patents
自硬性鋳型造型用粘結剤組成物 Download PDFInfo
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- WO2011078082A1 WO2011078082A1 PCT/JP2010/072779 JP2010072779W WO2011078082A1 WO 2011078082 A1 WO2011078082 A1 WO 2011078082A1 JP 2010072779 W JP2010072779 W JP 2010072779W WO 2011078082 A1 WO2011078082 A1 WO 2011078082A1
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- binder composition
- condensate
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- furfuryl alcohol
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
- C08L71/08—Polyethers derived from hydroxy compounds or from their metallic derivatives
- C08L71/14—Furfuryl alcohol polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
- B22C1/10—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives for influencing the hardening tendency of the mould material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
- B22C1/22—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
- B22C1/22—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins
- B22C1/2233—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- B22C1/224—Furan polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
- B22C1/22—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins
- B22C1/2233—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- B22C1/2246—Condensation polymers of aldehydes and ketones
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G4/00—Condensation polymers of aldehydes or ketones with polyalcohols; Addition polymers of heterocyclic oxygen compounds containing in the ring at least once the grouping —O—C—O—
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
- C08L61/04—Condensation polymers of aldehydes or ketones with phenols only
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J161/00—Adhesives based on condensation polymers of aldehydes or ketones; Adhesives based on derivatives of such polymers
Definitions
- the present invention relates to a self-hardening mold forming binder composition and a mold production method using the same.
- the acid-curable self-hardening mold contains a self-hardening mold-forming binder containing an acid-curable resin such as furan resin, phosphoric acid, organic sulfonic acid, sulfuric acid, etc. in refractory particles such as silica sand. After adding a curing agent and kneading these, the obtained kneaded sand is filled into a mold such as a wooden mold and the acid curable resin is cured.
- an acid-curable resin such as furan resin, phosphoric acid, organic sulfonic acid, sulfuric acid, etc. in refractory particles such as silica sand.
- furan resin furfuryl alcohol, furfuryl alcohol / urea formaldehyde resin, furfuryl alcohol / formaldehyde resin, furfuryl alcohol / phenol / formaldehyde resin, and other known modified furan resins are used.
- Patent Documents 1 to 6 disclose self-hardening mold forming binder compositions containing furan resin obtained by polycondensation of furfuryl alcohol and aldehydes as main components.
- deep part sclerosis means the hardening performance of the location which does not touch outside air (location where it contacts the original mold) when kneaded sand is filled into the original mold. 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 delayed because the reaction water is difficult to be removed.
- the deep part of the mold is the contact part with the original mold such as a wooden mold and is the most important. Therefore, the mold is not only fast in curing speed but also has a good deep part curing property that cures sufficiently to the deep part of the mold. There is a need for a binder.
- the present invention provides a self-hardening mold forming binder composition capable of improving mold strength and mold deep part curability, and a mold production method using the same.
- the binder composition for self-hardening mold making of the present invention comprises at least one condensate (A) selected from a furfuryl alcohol condensate and a furfuryl alcohol / formaldehyde condensate, an acid curable resin (B), A condensate (A) comprising a furan ring (a), a methylol group (b), a methylene group (c), and an oxymethylene group (d).
- the molar ratio of a: (b + c + d) 1: 1.00 to 1: 1.08, and the condensate (A) content is 0.3 to 8.0 wt. %, A self-hardening mold-forming binder composition.
- the method for producing a mold of the present invention is a method for producing a mold having a step of curing a mixture containing the binder composition for molding a self-hardening mold of the present invention, refractory particles and a curing agent.
- the mold strength and the deep part curability of the mold can be improved.
- the mold strength and the deep part curability of the mold can be improved, so that the productivity of the mold is improved.
- the self-hardening mold forming binder composition of the present invention (hereinafter also simply referred to as “binder composition”) is one or more condensations selected from a furfuryl alcohol condensate and a furfuryl alcohol / formaldehyde condensate.
- the product (A) and the acid curable resin (B) are contained.
- the condensate (A) has a specific structure described later.
- the components contained in the binder composition of the present invention will be described.
- the binder composition of the present invention contains one or more condensates (A) selected from a furfuryl alcohol condensate and a furfuryl alcohol / formaldehyde condensate.
- A the abundance ratio of the furan ring (a) and the total of the methylol group (b), the methylene group (c), and the oxymethylene group (d) is from the viewpoint of the deep curability of the mold.
- the reason why deep curability is improved when the condensate (A) is used is not clear, but the hydrophobicity of the condensate (A) is increased by setting the abundance ratio of each functional group within the above range. As a result, it is presumed that the reaction water is easily removed and the curing reaction in the deep part of the mold is promoted. Furfuryl alcohol is not included in the condensate (A).
- the abundance ratio can be measured by 13C-NMR quantitative integration method (Inverse gate decoupling method). Specifically, the measurement is performed by performing 20,000 integrations under the condition that the sample concentration is 20 wt%, the solvent is deuterated chloroform, and the nuclear overhauser effect is removed. Then, with respect to the obtained peak, half of the peak area of 104 to 115 ppm is furan ring (a), the peak area of 56 to 60 ppm is methylol group (b), and the peak area of 25 to 30 ppm is methylene group (c). The abundance ratios are calculated by calculating the respective area ratios with the peak area of 62 to 65 ppm as the oxymethylene group (d).
- the furfuryl alcohol (monomer remaining after the synthesis) in the sample is quantified by gas chromatography and calculated by excluding the portion derived from furfuryl alcohol from each of the peak areas.
- the sample contains components other than furfuryl alcohol condensate, furfuryl alcohol / formaldehyde condensate and furfuryl alcohol, the liquid-liquid separation operation with a solvent, etc. After the components are separated and identified, they can be analyzed by the 13C-NMR to obtain the abundance ratio.
- the furfuryl alcohol condensate can be obtained by mixing furfuryl alcohol and an acid catalyst and reacting them.
- Acid catalysts include inorganic acids such as hydrochloric acid, sulfuric acid, phosphoric acid, condensed phosphoric acid, sulfonic acids such as benzenesulfonic acid, paratoluenesulfonic acid, xylenesulfonic acid, methanesulfonic acid, glutaric acid, succinic acid, acetic acid, Organic carboxylic acids such as oxalic acid, lactic acid, malic acid, benzoic acid, gallic acid and glycolic acid can be used.
- an inorganic acid that is a stronger acid is preferable.
- a furfuryl alcohol condensate you may use commercial items, such as a difurfuryl ether.
- Furfuryl alcohol / formaldehyde condensate can be obtained by mixing furfuryl alcohol, formaldehyde and an acid catalyst and reacting them.
- the acid catalyst the same acid catalyst as used in the synthesis of the furfuryl alcohol condensate described above can be used.
- the weight average molecular weight of the condensate (A) is preferably from 200 to 5000, more preferably from 250 to 3000, and more preferably from 300 to 1000, from the viewpoint of improving the deep-part curability and the viscosity of the binder composition. More preferably it is.
- the weight average molecular weight of the condensate (A) is calculated excluding the peak of unreacted furfuryl alcohol. An example of a specific measuring method is shown in the Example mentioned later.
- the content of the condensate (A) in the binder composition is 0.3% by weight or more, preferably 0.5% by weight or more, and preferably 1.0% by weight or more, from the viewpoint of deep curability of the mold. Is more preferable, 1.3% by weight or more is further preferable, and 1.5% by weight or more is more preferable. Further, from the viewpoint of improving the final mold strength, the content of the condensate (A) in the binder composition is 8.0% by weight or less, preferably 5.0% by weight or less. 5 wt% or less is more preferable, and 4.0 wt% or less is more preferable.
- the content of the condensate (A) in the binder composition is 0.3 to 8.0% by weight, preferably 0.5 to 5.0% by weight, Is more preferably from 4.5 to 4.5% by weight, still more preferably from 1.3 to 4.0% by weight, still more preferably from 1.5 to 4.0% by weight.
- ⁇ Acid curable resin (B)> As the acid curable resin (B), a conventionally known acid curable resin may be used as long as it does not satisfy the condition ⁇ a: (b + c + d) 1: 1.00 to 1.08 ⁇ of the condensate (A). Selected from the group consisting of furfuryl alcohol, condensates of furfuryl alcohol and aldehydes, condensates of phenol and aldehydes, condensates of melamine and aldehydes, and condensates of urea and aldehydes. Or a mixture of two or more selected from these groups can be used.
- cocondensates chosen from the said group can also be used.
- a condensate of furfuryl alcohol, phenols, and aldehydes a condensate of furfuryl alcohol, melamine, and aldehydes, and furfuryl alcohol, urea, and aldehydes.
- a furan resin composed of one kind selected from the group consisting of condensates, or a furan resin composed of a mixture of two or more kinds selected from these groups is preferred.
- furfuryl alcohol is handled as an acid curable resin (B).
- aldehydes examples 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.
- phenols examples include phenol, cresol, resorcin, bisphenol A, bisphenol C, bisphenol E, and bisphenol F, and one or more of these can be used.
- the content of the acid curable resin (B) in the binder composition is preferably 50 to 98% by weight, more preferably 80 to 97% by weight, from the viewpoint of improving the final mold strength. More preferably, it is 90 to 96% by weight.
- the content of furfuryl alcohol in the binder composition is: The amount is preferably 50 to 98% by weight, more preferably 60 to 90% by weight, and still more preferably 70 to 85% by weight.
- the viscosity of the binder composition is preferably low.
- 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.
- the binder composition of the present invention amino groups such as urea are considered to form a cross-linking bond with the resin component, and it is presumed that this has a favorable effect on the flexibility of the resulting mold.
- 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.
- the nitrogen content in the binder composition is preferably 0.8% by weight or more, and 1.8% by weight or more.
- the nitrogen content in the binder composition is preferably 3.5% by weight or less, more preferably 3.4% by weight or less. It is further preferably 3% by weight or less, and still more preferably 3.2% by weight or less. Taking the above viewpoints together, the nitrogen content in the binder composition is preferably 0.8 to 3.5% by weight, more preferably 1.8 to 3.5% by weight. It is more preferably from 2 to 3.4% by weight, even more preferably from 2.3 to 3.3% by weight, even more preferably from 2.5 to 3.2% by weight.
- the content of the nitrogen-containing compound in the binder composition may be adjusted.
- 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.
- urea urea-modified resin
- the binder composition of the present invention may contain a curing accelerator from the viewpoint of preventing cracking of the mold and improving the final mold strength.
- a curing accelerator from the viewpoint of improving the final mold strength, a compound represented by the following general formula (1) (hereinafter referred to as curing accelerator (1)), a phenol derivative, an aromatic dialdehyde, and tannin.
- curing accelerator (1) a compound represented by the following general formula (1)
- phenol derivative phenol derivative
- aromatic dialdehyde aromatic dialdehyde
- tannin One or more selected from the group consisting of categoricals is preferred.
- X 1 and X 2 each represent a hydrogen atom, CH 3 or C 2 H 5 .
- Examples of the curing accelerator (1) include 2,5-bishydroxymethyl furan, 2,5-bismethoxymethyl furan, 2,5-bisethoxymethyl furan, 2-hydroxymethyl-5-methoxymethyl furan, 2-hydroxy Examples thereof include methyl-5-ethoxymethylfuran and 2-methoxymethyl-5-ethoxymethylfuran.
- 2,5-bishydroxymethylfuran is preferably used from the viewpoint of improving the final template strength.
- the content of the curing accelerator (1) in the binder composition is from the viewpoint of solubility of the curing accelerator (1) in the acid curable resin (B) and from the viewpoint of improving the final mold strength. 0.5 to 63% by weight, preferably 1.8 to 50% by weight, more preferably 2.5 to 50% by weight, and 3.0 to 40% by weight. Even more preferably.
- phenol derivative examples include resorcin, cresol, hydroquinone, phloroglucinol, methylene bisphenol, and the like.
- resorcin is preferable from the viewpoint of deep moldability of the mold and the viewpoint of improving the final mold strength.
- the content of the phenol derivative in the binder composition is 1 to 25% by weight from the viewpoint of the solubility of the phenol derivative in the acid curable resin (B) and the final mold strength. It is preferably 2 to 15% by weight, more preferably 3 to 10% by weight.
- the content of resorcin in the binder composition is selected from the viewpoint of the solubility of resorcin in the acid curable resin (B), the viewpoint of the deep curability of the mold, and the final mold. From the viewpoint of improving the strength, it is preferably 1 to 10% by weight, more preferably 2 to 7% by weight, and still more preferably 3 to 6% by weight.
- aromatic dialdehydes examples include terephthalaldehyde, phthalaldehyde and 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 (B) and suppressing the odor of the aromatic dialdehyde itself. Is 0.1 to 15% by weight, more preferably 0.5 to 10% by weight, still more preferably 1 to 5% by weight.
- tannins include condensed tannins and hydrolyzed tannins.
- condensed tannins and hydrolyzed tannins include tannins having a pyrogallol skeleton and a resorcin skeleton.
- the binder composition of the present invention may further contain moisture.
- moisture 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 moisture. However, when such a condensate is used in a binder composition, it is not necessary to darely remove these moisture derived from the synthesis process. In addition, moisture may be further added for the purpose of adjusting the binder composition to a viscosity that is easy to handle.
- the moisture content in the binder composition should be in the range of 0.5 to 30% by weight.
- the range of 1 to 10% by weight is more preferable, and the range of 3 to 7% by weight is more preferable from the viewpoint of easy handling of the binder composition and maintaining the curing reaction rate.
- it is preferably 10% by weight or less, more preferably 7% by weight or less, and still more preferably 4% by weight or less.
- the binder composition may further contain an additive such as a silane coupling agent.
- a silane coupling agent is included because the final mold strength can be improved.
- silane coupling agents include N- ⁇ (aminoethyl) ⁇ -aminopropylmethyldimethoxysilane, N- ⁇ (aminoethyl) ⁇ -aminopropyltrimethoxysilane, and N- ⁇ (aminoethyl) ⁇ -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.
- the binder composition of the present invention is suitable for a method for producing a mold having a step of curing a mixture containing refractory particles, a self-hardening mold forming binder composition and a curing agent. That is, the mold manufacturing method of the present invention is a mold manufacturing method using the above binder composition of the present invention as a self-hardening mold making binder composition.
- the mold can be manufactured using the process of the conventional mold manufacturing method as it is.
- the binder composition of the present invention and a curing agent for curing the binder composition to the refractory particles and kneading them with a batch mixer or a continuous mixer, the mixture (kneading) Sand).
- the binder composition of the present invention it is preferable to add the binder composition of the present invention after adding the curing agent to the refractory particles.
- 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.
- Curing agents include xylene sulfonic acid (especially m-xylene sulfonic acid), toluene sulfonic acid (particularly p-toluene sulfonic acid), sulfonic acid compounds such as methane sulfonic acid, phosphoric acid, acidic phosphoric acid ester, etc.
- xylene sulfonic acid especially m-xylene sulfonic acid
- toluene sulfonic acid particularly p-toluene sulfonic acid
- sulfonic acid compounds such as methane sulfonic acid, phosphoric acid, acidic phosphoric acid ester, etc.
- One or more conventionally known compounds such as an acidic aqueous solution containing a phosphoric acid compound and sulfuric acid can be used.
- the curing agent may contain one or more solvents selected from the group consisting of alcohols, ether alcohols and esters, and carboxylic acids
- alcohols and ether alcohols are preferable and ether alcohols are more preferable from the viewpoint of improving the final mold strength.
- the content of the solvent or the carboxylic acid in the curing agent is preferably 5 to 50% by weight and more preferably 10 to 40% by weight 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 Ether acetate are preferred.
- 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 ratio of the refractory particles, the binder composition and the curing agent in the kneaded sand can be set as appropriate, but the binder composition is 0.5 to 1.5 parts by weight with respect to 100 parts by weight of the refractory particles.
- 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.
- the content of the curing agent is based on 100 parts by weight of the acid curable resin (B) in the binder composition from the viewpoint of minimizing the amount of water contained in the mold and the mixing efficiency in the mixer.
- the amount is preferably 10 to 40 parts by weight, more preferably 15 to 35 parts by weight, and still more preferably 18 to 25 parts by weight.
- ⁇ Mold hardness> The kneaded sand immediately after kneading is put into a polypropylene cup having a diameter of 200 mm and a height of 200 mm, and the mold is taken out from the polypropylene cup when the mold is drawn, and the mold upper surface (the surface exposed to the outside air) and the mold lower surface (polypropylene cup).
- the surface hardness of the surface that had been in contact with the bottom surface was measured with a furan mold surface hardness tester (manufactured by Nakayama).
- the above “die cutting time” means that the kneaded sand immediately after kneading is filled into a columnar test piece frame having a diameter of 50 mm and a height of 50 mm and left standing at 25 ° C. and 50% RH for a predetermined time, Then, the compressive strength is measured by the method described in JIS Z 2604-1976, and indicates the standing time immediately after filling when the obtained measured value reaches 0.8 MPa for the first time after standing. Moreover, the value of the surface hardness shown in Table 2 is a value of the scale (unitless) indicated by the surface hardness meter for furan mold.
- ⁇ Deep part curability> The surface hardness of the upper surface and the lower surface of the mold was measured as described above, and the ratio of the lower surface hardness / the upper surface hardness was calculated, and this was used as an index of deep part curability. The closer the ratio of lower surface hardness / upper surface hardness was to 1.00, the better the deep part curability was determined to be a binder composition.
- ⁇ Synthesis of Condensate 1> 100 parts by weight of furfuryl alcohol and 5 parts by weight of glutaric acid (manufactured by Wako Pure Chemical Industries, Ltd.) are added to a three-necked flask (molar ratio is furfuryl alcohol: glutaric acid 1: 0.008), and the temperature is raised to 100 ° C. while stirring. Then, it was made to react at the same temperature for 8 hours, and the condensate 1 was obtained. The reaction conditions and the like are shown in Table 1.
- ⁇ Synthesis of Condensate 2> 100 parts by weight of furfuryl alcohol, 1.7 parts by weight of paraformaldehyde, and 5 parts by weight of glutaric acid (manufactured by Wako Pure Chemical Industries, Ltd.) are added to a three-necked flask (molar ratio is furfuryl alcohol: formaldehyde: glutaric acid 1: 0.05). : 0.02), after raising the temperature to 100 ° C., the mixture was reacted at the same temperature for 8 hours to obtain a condensate 2.
- the reaction conditions and the like are shown in Table 1.
- ⁇ Synthesis of Condensate 3> 100 parts by weight of furfuryl alcohol, 5 parts by weight of paraformaldehyde and 5 parts by weight of glutaric acid (manufactured by Wako Pure Chemical Industries, Ltd.) are added to a three-necked flask (molar ratio is furfuryl alcohol: formaldehyde: glutaric acid 1: 0.15: 0). 0.02), after raising the temperature to 100 ° C., the mixture was reacted at the same temperature for 8 hours to obtain a condensate 3.
- the reaction conditions and the like are shown in Table 1.
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Abstract
Description
本発明の粘結剤組成物は、フルフリルアルコール縮合物及びフルフリルアルコール・ホルムアルデヒド縮合物から選ばれる1種以上の縮合物(A)を含有する。縮合物(A)としては、鋳型の深部硬化性の観点から、フラン環(a)と、メチロール基(b)、メチレン基(c)及びオキシメチレン基(d)の合計との存在比が、モル比でa:(b+c+d)=1:1.00~1:1.08であり、好ましくはa:(b+c+d)=1:1.00~1:1.05であり、より好ましくはa:(b+c+d)=1:1.00である。上記縮合物(A)を用いると深部硬化性が向上する理由は定かではないが、各官能基の存在比を上記範囲内とすることにより、縮合物(A)の疎水性が高くなるため、その結果、反応水が除去されやすくなり、鋳型の深部の硬化反応が促進されるものと推測される。なお、フルフリルアルコールは、縮合物(A)には含まれない。
酸硬化性樹脂(B)としては、上記縮合物(A)の条件{a:(b+c+d)=1:1.00~1.08}を満たさないものである限り、従来公知の酸硬化性樹脂が使用でき、例えば、フルフリルアルコール、フルフリルアルコールとアルデヒド類の縮合物、フェノール類とアルデヒド類の縮合物、メラミンとアルデヒド類の縮合物、及び尿素とアルデヒド類の縮合物よりなる群から選ばれる1種からなるものや、これらの群から選ばれる2種以上の混合物からなるものが使用できる。また、前記群から選ばれる2種以上の共縮合物からなるものや、前記群から選ばれる1種以上と前記共縮合物との混合物からなるものも使用できる。このうち、深部硬化性の観点及び樹脂粘度の観点から、フルフリルアルコールとフェノール類とアルデヒド類の縮合物、フルフリルアルコールとメラミンとアルデヒド類の縮合物、及びフルフリルアルコールと尿素とアルデヒド類の縮合物よりなる群から選ばれる1種からなるフラン樹脂、あるいはこれらの群から選ばれる2種以上の混合物からなるフラン樹脂が好ましい。また、造型時のホルムアルデヒドの発生量を低減する観点及び鋳型強度向上の観点から、フルフリルアルコールと尿素とアルデヒド類の縮合物であることが好ましい。また、粘結剤組成物の粘度を適度な範囲に調整する観点からは、フルフリルアルコールを用いることが好ましい。尚、フルフリルアルコールは酸硬化性樹脂(B)として扱う。
本発明の粘結剤組成物中には、鋳型の割れを防ぐ観点、及び最終的な鋳型強度を向上させる観点から、硬化促進剤が含まれていてもよい。硬化促進剤としては、最終的な鋳型強度を向上させる観点から、下記一般式(1)で表される化合物(以下、硬化促進剤(1)という)、フェノール誘導体、芳香族ジアルデヒド、及びタンニン類からなる群より選ばれる1種以上が好ましい。
本発明の粘結剤組成物中には、さらに水分が含まれてもよい。例えば、フルフリルアルコールとアルデヒド類の縮合物などの各種縮合物を合成する場合、水溶液状の原料を使用したり縮合水が生成したりするため、縮合物は、通常、水分との混合物の形態で得られるが、このような縮合物を粘結剤組成物に使用するにあたり、合成過程に由来するこれらの水分をあえて除去する必要はない。また、粘結剤組成物を取扱いやすい粘度に調整する目的などで、水分をさらに添加してもよい。ただし、水分が過剰になると、酸硬化性樹脂(B)の硬化反応が阻害されるおそれがあるため、粘結剤組成物中の水分含有量は0.5~30重量%の範囲とすることが好ましく、粘結剤組成物を扱いやすくする観点と硬化反応速度を維持する観点から1~10重量%の範囲がより好ましく、3~7重量%の範囲が更に好ましい。また、最終的な鋳型強度を向上させる観点から、10重量%以下とすることが好ましく、7重量%以下とすることがより好ましく、4重量%以下とすることが更に好ましい。
また、粘結剤組成物中には、さらにシランカップリング剤等の添加剤が含まれていてもよい。例えばシランカップリング剤が含まれていると、最終的な鋳型強度を向上させることができるため好ましい。シランカップリング剤としては、N-β(アミノエチル)γ-アミノプロピルメチルジメトキシシラン、N-β(アミノエチル)γ-アミノプロピルトリメトキシシラン、N-β(アミノエチル)γ-アミノプロピルトリエトキシシラン、3-アミノプロピルトリメトキシシラン等のアミノシランや、3-グリシドキシプロピルトリメトキシシラン、3-グリシドキシプロピルトリエトキシシラン、3-グリシドキシプロピルメチルジエトキシシラン、3-グリシドキシプロピルトリエトキシシラン等のエポキシシラン、ウレイドシラン、メルカプトシラン、スルフィドシラン、メタクリロキシシラン、アクリロキシシランなどが用いられる。好ましくは、アミノシラン、エポキシシラン、ウレイドシランである。シランカップリング剤の粘結剤組成物中の含有量は、最終的な鋳型強度を向上させる観点から、0.01~0.5重量%であることが好ましく、0.05~0.3重量%であることがより好ましい。
東ソー株式会社製ゲル濾過クロマトグラフSC-8020シリーズ・ビルドアップシステム(カラム:G2000HXL+G4000HXL、検出器:UV254nm、キャリヤ:テトラヒドロフラン1mL/分、カラム温度:38℃)を用い、標準ポリスチレン換算で重量平均分子量を求めた。その際、未反応のフルフリルアルコールのピークは除外して計算した。
縮合物を合成した後、得られた縮合物を含む混合物中のフルフリルアルコールをガスクロマトグラフィー法にて定量し、更に上記混合物中の水分量をカールフィッシャー法にて定量し、上記混合物の総量から、上記フルフリルアルコール及び水の量と、仕込み量から計算される触媒の量とを除いた量を、縮合物の量とした。
JIS M 8813に示されるケルダール法にて測定を行った。
直径200mm、高さ200mmのポリプロピレン製カップに混練直後の混練砂を入れて、抜型時間経過時にポリプロピレン製カップから鋳型を取り出し、鋳型上面(外気に晒されていた面)及び鋳型下面(ポリプロピレン製カップの底面に接触していた面)の表面硬度をフラン鋳型用表面硬度計(ナカヤマ製)で測定した。なお、上記「抜型時間」とは、混練直後の混練砂を直径50mm、高さ50mmの円柱形状のテストピース枠に充填し、25℃、50%RHの条件下で所定時間放置した後、抜型し、JIS Z 2604-1976に記載された方法で、圧縮強度を測定し、得られた測定値が放置後はじめて0.8MPaに到達したときの充填直後からの放置時間をさす。また、表2に示す表面硬度の値は、上記フラン鋳型用表面硬度計が示した目盛(無単位)の値である。
上述のようにして鋳型の上面及び下面の表面硬度を測定し、下面硬度/上面硬度の比率を算出し、これを深部硬化性の指標とした。下面硬度/上面硬度の比率が1.00に近いほど、深部硬化性が良好な粘結剤組成物であると判断した。
混練直後の混練砂を直径50mm、高さ50mmの円柱形状のテストピース枠に充填した。充填後5時間経過した時に抜型を行い、25℃、55%RHの条件下で24時間放置した後、JIS Z 2604-1976に記載された方法で圧縮強度を測定し、得られた測定値を24時間後の鋳型強度とした。
三ツ口フラスコにフルフリルアルコール100重量部とグルタル酸(和光純薬社製)5重量部を加え(モル比はフルフリルアルコール:グルタル酸=1:0.008)、攪拌しながら100℃に昇温後、同温度で8時間反応させて、縮合物1を得た。反応条件等を表1に示す。
三ツ口フラスコにフルフリルアルコール100重量部とパラホルムアルデヒド1.7重量部とグルタル酸(和光純薬社製)5重量部を加え(モル比はフルフリルアルコール:ホルムアルデヒド:グルタル酸=1:0.05:0.02)、100℃に昇温後、同温度で8時間反応させて、縮合物2を得た。反応条件等を表1に示す。
三ツ口フラスコにフルフリルアルコール100重量部とパラホルムアルデヒド5重量部とグルタル酸(和光純薬社製)5重量部を加え(モル比はフルフリルアルコール:ホルムアルデヒド:グルタル酸=1:0.15:0.02)、100℃に昇温後、同温度で8時間反応させて、縮合物3を得た。反応条件等を表1に示す。
昇温後の反応時間を表1に示す時間に変更したこと以外は、縮合物1と同様の方法で、縮合物4,5を得た。また、酸触媒を塩酸に変更し、モル比をフルフリルアルコール:酸触媒=1:0.0003に変更し、昇温後の反応時間を表1に示す時間に変更したこと以外は、縮合物1と同様の方法で、縮合物6を得た。また、酸触媒を表1に示す酸に変更したこと以外は、縮合物1と同様の方法で、縮合物7~10を得た。反応条件等をそれぞれ表1に示す。
25℃、50%RHの条件下で、フラン再生砂100重量部に対し、硬化剤〔花王クエーカー社製 カオーライトナー硬化剤 TK-3と、花王クエーカー社製 カオーライトナー硬化剤 F-9との混合物(重量比はTK-3/F-9=23/17)〕0.36重量部を添加し、次いで表2に示す粘結剤組成物0.90重量部を添加し、これらを混合して混練砂を得た。得られた混練砂について、上述した方法で各項目の評価を行った。結果を表2に示す。なお、上記フラン再生砂としては、空気中、1000℃で1時間加熱したときの重量減少率(LOI)が1.4重量%のものを用いた。
Claims (10)
- フルフリルアルコール縮合物及びフルフリルアルコール・ホルムアルデヒド縮合物から選ばれる1種以上の縮合物(A)と、酸硬化性樹脂(B)とを含有する自硬性鋳型造型用粘結剤組成物であって、
前記縮合物(A)は、フラン環(a)と、メチロール基(b)、メチレン基(c)及びオキシメチレン基(d)の合計との存在比が、モル比でa:(b+c+d)=1:1.00~1:1.08であり、
前記縮合物(A)の含有量が、0.3~8.0重量%である、自硬性鋳型造型用粘結剤組成物。 - 前記縮合物(A)が、ホルムアルデヒド及びフルフリルアルコールを、ホルムアルデヒド:フルフリルアルコール=0.00:1~0.08:1のモル比で反応させて得られる縮合物である請求項1記載の自硬性鋳型造型用粘結剤組成物。
- 前記縮合物(A)の重量平均分子量が、200~5000である請求項1又は2記載の自硬性鋳型造型用粘結剤組成物。
- 前記酸硬化性樹脂(B)の含有量が、50~98重量%である請求項1~3の何れか1項記載の自硬性鋳型造型用粘結剤組成物。
- 前記酸硬化性樹脂(B)が、フルフリルアルコールを含有し、
前記粘結剤組成物中のフルフリルアルコールの含有量が、50~98重量%である請求項4記載の自硬性鋳型造型用粘結剤組成物。 - 更に、レゾルシンを含有する請求項1~5の何れか1項記載の自硬性鋳型造型用粘結剤組成物。
- 更に、シランカップリング剤を含有する請求項1~6の何れか1項記載の自硬性鋳型造型用粘結剤組成物。
- 前記粘結剤組成物中の窒素含有量が、1.8~3.5重量%である請求項1~7の何れか1項記載の自硬性鋳型造型用粘結剤組成物。
- 耐火性粒子及び硬化剤と共に用いられる、請求項1~8の何れか1項記載の自硬性鋳型造型用粘結剤組成物。
- 請求項1~9の何れか1項記載の自硬性鋳型造型用粘結剤組成物、耐火性粒子及び硬化剤を含む混合物を硬化する工程を有する鋳型の製造方法。
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- 2010-12-17 EP EP10839312.5A patent/EP2517807B1/en active Active
- 2010-12-17 US US13/519,078 patent/US8822568B2/en active Active
- 2010-12-17 KR KR1020127019151A patent/KR101421191B1/ko active IP Right Grant
- 2010-12-17 MY MYPI2012002902A patent/MY163382A/en unknown
- 2010-12-17 CN CN201080059134.0A patent/CN102665960B/zh active Active
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Cited By (12)
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KR101878534B1 (ko) * | 2011-08-31 | 2018-07-13 | 카오카부시키가이샤 | 자경성 주형 조형용 점결제 조성물 및 그것을 사용한 주형의 제조 방법 |
US9376543B2 (en) | 2012-03-26 | 2016-06-28 | Sekisui Chemical Co., Ltd. | Thermosetting furan resin composition and furan resin laminated body using the same |
US20150114588A1 (en) * | 2012-04-27 | 2015-04-30 | Kao Corporation | Curing agent composition for making foundry molds, use of the same, method of producing the same, and method of making foundry mold |
US9463504B2 (en) * | 2012-04-27 | 2016-10-11 | Kao Corporation | Curing agent composition for making foundry molds, use of the same, method of producing the same, and method of making foundry mold |
JP2013234286A (ja) * | 2012-05-10 | 2013-11-21 | Sekisui Chem Co Ltd | 熱硬化性フラン樹脂組成物、フラン樹脂硬化物及びそれらの製造方法 |
FR2995234A1 (fr) * | 2012-09-10 | 2014-03-14 | Huettenes Albertus France | Procede d'obtention d'un corps pour fonderie a partir d'un melange granulaire comprenant une resine polycondensee contenant des motifs aromatiques et un capteur de formaldehyde |
WO2014037681A3 (fr) * | 2012-09-10 | 2014-11-13 | Huttenes Albertus France | Procédé d'obtention d'un corps pour fonderie à partir d'un mélange granulaire comprenant une résine polycondensée modifée et un capteur de formaldéhyde |
CN104619437A (zh) * | 2012-09-10 | 2015-05-13 | 胡坦斯·阿尔伯图斯法国公司 | 用于由包含改性缩聚树脂和甲醛清除剂的粒状混合物获得铸型体的方法 |
EA028270B1 (ru) * | 2012-09-10 | 2017-10-31 | Юттен Альбертус Франс | Способ получения тел для литейного производства из гранулированной смеси, содержащей модифицированную поликонденсированную смолу и поглотитель формальдегида |
US10137494B2 (en) | 2012-09-10 | 2018-11-27 | Huttenes Albertus France | Method for obtaining a foundry body from a granular mixture comprising a modified polycondensed resin and a formaldehyde scavenger |
CN104263298A (zh) * | 2014-10-07 | 2015-01-07 | 珠海市斗门福联造型材料实业有限公司 | 一种薄壁有色金属铸件专用热芯盒树脂粘结剂及其制备方法 |
CN104263298B (zh) * | 2014-10-07 | 2016-08-24 | 珠海市斗门福联造型材料实业有限公司 | 一种薄壁有色金属铸件专用热芯盒树脂粘结剂及其制备方法 |
Also Published As
Publication number | Publication date |
---|---|
US8822568B2 (en) | 2014-09-02 |
EP2517807B1 (en) | 2018-06-20 |
EP2517807A1 (en) | 2012-10-31 |
EP2517807A4 (en) | 2016-04-27 |
US20120289651A1 (en) | 2012-11-15 |
KR101421191B1 (ko) | 2014-07-22 |
JP5670171B2 (ja) | 2015-02-18 |
CN102665960B (zh) | 2015-11-25 |
KR20120106852A (ko) | 2012-09-26 |
MY163382A (en) | 2017-09-15 |
JP2011147999A (ja) | 2011-08-04 |
CN102665960A (zh) | 2012-09-12 |
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