WO2020070819A1 - Composition de liant pour former un moule - Google Patents

Composition de liant pour former un moule

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Publication number
WO2020070819A1
WO2020070819A1 PCT/JP2018/037004 JP2018037004W WO2020070819A1 WO 2020070819 A1 WO2020070819 A1 WO 2020070819A1 JP 2018037004 W JP2018037004 W JP 2018037004W WO 2020070819 A1 WO2020070819 A1 WO 2020070819A1
Authority
WO
WIPO (PCT)
Prior art keywords
mold
mass
binder composition
composition
viewpoint
Prior art date
Application number
PCT/JP2018/037004
Other languages
English (en)
Japanese (ja)
Inventor
宏明 青沼
俊樹 松尾
友希 猪狩
Original Assignee
花王株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 花王株式会社 filed Critical 花王株式会社
Priority to JP2020550999A priority Critical patent/JP6971412B2/ja
Priority to PCT/JP2018/037004 priority patent/WO2020070819A1/fr
Priority to CN201880093796.6A priority patent/CN112203784A/zh
Publication of WO2020070819A1 publication Critical patent/WO2020070819A1/fr

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Classifications

    • 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
    • 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

Definitions

  • the present invention relates to a binder composition for mold making.
  • an acid-curable mold is a refractory particle such as silica sand, a mold-forming binder composition containing an acid-curable resin, and a curing agent composition containing sulfonic acid, sulfuric acid, phosphoric acid, and the like.
  • the obtained kneading sand is filled in a prototype such as a wooden mold, and the acid-curable resin is cured to produce the mixture.
  • Furan resin and phenol resin are used as the acid-curable resin.
  • Furfuryl alcohol, furfuryl alcohol / urea / formaldehyde resin, furfuryl alcohol / formaldehyde resin, furfuryl alcohol / phenol / Formaldehyde resins and other known modified furan resins are used.
  • Such a method of manufacturing a mold allows for a high degree of freedom in molding work, and because of the excellent thermal properties of the mold, high-quality castings can be manufactured. Therefore, machine parts, construction machine parts, automobile parts, etc. It is widely used when casting castings.
  • furfuryl alcohol is widely used as a component of acid-curable resins such as furan resins.
  • furfuryl alcohol is produced through a process of hydrolyzing and dehydrating a raw material composed of agricultural by-products such as corn core to obtain furfural, and a process of hydrogenating furfural, and the production cost is relatively high.
  • a large amount of residue is generated as waste in the process of producing furfural (Chinese Patent Application Publication No. 103113548).
  • furfuryl alcohol may not be supplied stably due to reasons such as suspension of production or production reduction due to environmental regulations at a factory for producing fururyl alcohol or furfural.
  • the binder composition for mold making of the present invention contains a furan resin, water, and a hydrolyzed starch, and a mass ratio of the furan resin to the hydrolyzed starch (mass of the furan resin / the hydrolyzed starch). (Mass of starch) is 20 to 95, and the dextrose equivalent of the hydrolyzed starch is 60 or more.
  • the present invention provides a binder composition for mold making that does not require a denaturing step while using saccharides and can suppress economic and energy costs.
  • the binder composition for mold making of the present invention contains a furan resin, water, and a hydrolyzed starch, and a mass ratio of the furan resin to the hydrolyzed starch (mass of the furan resin / the hydrolyzed starch). (Mass of starch) is 20 to 95, and the dextrose equivalent of the hydrolyzed starch is 60 or more.
  • a binder composition for mold making which does not require a denaturation step while using saccharides, and can suppress economic and energy costs.
  • the binder composition for mold making of the present embodiment (hereinafter, also simply referred to as a binder composition) contains a furan resin, water, and hydrolyzed starch, and the furan resin, the hydrolyzed starch, (Mass of the furan resin / mass of the hydrolyzed starch) is 20 to 95, and the dextrose equivalent of the hydrolyzed starch is 60 or more.
  • the binder composition of the present embodiment a denaturation step is not required while using saccharides, so that economic cost and energy cost can be suppressed.
  • the reason why the binder composition of this embodiment exhibits such an effect is not clear, but is considered as follows.
  • Starch tends to have poor solubility in furan resin, but using a hydrolyzed starch having a specific dextrose equivalent (DE equivalent), the mass ratio of the furan resin to the hydrolyzed starch (mass of the furan resin / It has been found that a certain degree of solubility in both water and furan resin can be obtained by setting the mass of the hydrolyzed starch to a specific range.
  • DE equivalent dextrose equivalent
  • the binder composition of the present embodiment it is considered that a denaturation step is not required while using saccharides, so that economic cost and energy cost can be suppressed. Further, it is considered that the binder composition can form a uniform adhesive layer without phase separation even in the kneading step with the curing agent composition and the refractory particles, and thus can maintain the mold strength. .
  • the furan resin is furfuryl alcohol, a condensate of furfuryl alcohol, a condensate of furfuryl alcohol and aldehydes, a condensate of furfuryl alcohol and urea and aldehydes (urea-modified furan resin), urea, ethylene urea and aldehyde Consisting of a condensate of urea and ethylene urea, a condensate of melamine and aldehyde, and a condensate of urea and aldehyde, and 2 selected from these groups
  • One composed of a mixture of two or more species can be exemplified.
  • those comprising two or more cocondensates selected from these groups can also be used.
  • furfuryl alcohol, a condensate of furfuryl alcohol and one or more selected from condensates of furfuryl alcohol, urea and aldehydes, and co-condensation thereof from the viewpoint of improving the curing speed of the mold and improving the mold strength It is preferable to use an object.
  • the monomer composition used for the synthesis of the furan resin contains furfuryl alcohol, and one or more monomers selected from, for example, aldehydes, urea, phenols, and melamine are selected according to the desired condensate. Is available.
  • aldehydes examples include formaldehyde, acetaldehyde, glyoxal, furfural, terephthalaldehyde, and hydroxymethylfurfural, 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, terephthalaldehyde, or hydroxymethylfurfural.
  • phenols examples include phenol, cresol, resorcin, bisphenol A, bisphenol C, bisphenol E, bisphenol F and the like, and one or more of these can be used.
  • the reaction temperature at the time of synthesizing the furan resin varies depending on the raw materials used, and the viscosity of the obtained binder composition, the residual amount of aldehyde, the production time, the runaway reaction of the furan resin, and the prevention of evaporation of the raw materials From the viewpoint, the temperature is preferably from 50 to 150 ° C, more preferably from 70 to 130 ° C, and still more preferably from 80 to 130 ° C. From the same viewpoint, the reaction time for synthesizing the furan resin is preferably 0.5 to 12 hours, more preferably 1 to 10 hours, and still more preferably 3 to 8 hours.
  • furan resin When the furan resin is produced, furan resin, furfuryl alcohol as a raw material, water contained in the raw material, water generated during the reaction, and the like are included, but may not be removed from the viewpoint of economy.
  • the furan resin composition contains components other than the furan resin, furfuryl alcohol and the furan resin, such as water.
  • the content of the furan resin in the binder composition is preferably 50% by mass or more, more preferably 60% by mass or more, and even more preferably 65% by mass or more, from the viewpoint of improving the mold strength.
  • the content of the furan resin in the binder composition is preferably 98% by mass or less, and more preferably 95% by mass or less, from the viewpoint of viscosity reduction.
  • the content of the furan resin in the binder composition of the present embodiment is preferably from 50 to 98% by mass, more preferably from 60 to 95% by mass, and more preferably from 65 to 95% by mass from the viewpoint of improving the mold strength and decreasing the viscosity. 95 mass% is more preferred.
  • the content of water in the binder composition is preferably 0.5% by mass or more, more preferably 1% by mass or more, and still more preferably 3% by mass or more.
  • the water content of the binder composition is preferably 30% by mass or less, and more preferably 25% by mass or less.
  • the water content of the binder composition is preferably from 0.5 to 30% by mass, from the viewpoint of adjusting the viscosity of the binder composition to an easily handleable viscosity and maintaining the curing reaction rate. It is more preferably 25% by mass, and still more preferably 3 to 25% by mass.
  • the condensate When synthesizing various condensates such as a condensate of furfuryl alcohol and aldehydes, the condensate is usually obtained in the form of a mixture with water because aqueous materials are used or condensed water is generated. Can be In using such a condensate in the binder composition, water may be removed by topping or the like, if necessary, but it is necessary to remove it during production as long as the curing reaction rate can be maintained. There is no.
  • the hydrolyzed starch is obtained by hydrolyzing starch with an acid or an enzyme.
  • the dextrose equivalent of the hydrolyzed starch is 60 or more, preferably 70 or more, from the viewpoint of compatibility between the hydrolyzed starch and the furan resin.
  • the dextrose equivalent of the hydrolyzed starch is preferably 99 or less, more preferably 80 or less from the viewpoint of economy.
  • dextrose equivalent is also referred to as dextrose equivalent (Dextrose Equivalent value), which is a measurement of reducing sugars as glucose and indicates the ratio of the reducing sugars to the total solid content. It is used as an index. In the present specification, dextrose equivalent is measured by the method described in Examples.
  • hydrolyzed starch for example, Fuji Syrup (Kato Kagaku) or the like is obtained as a commercial product.
  • the mass ratio of the furan resin to the hydrolyzed starch (mass of the furan resin / mass of the hydrolyzed starch) is from 20 to 95 from the viewpoint of compatibility between the hydrolyzed starch and the furan resin, and 90 is preferred.
  • the mass ratio of water to the hydrolyzed starch (mass of water / mass of the hydrolyzed starch) is from 1 to 30 from the viewpoint of the compatibility of the hydrolyzed starch and water with respect to the water, 2 to 20 are preferred.
  • the content of the hydrolyzed starch is preferably 1% by mass or more, more preferably 2% by mass or more from the viewpoint of economy.
  • the content of the hydrolyzed starch is preferably 20% by mass or less, more preferably 10% by mass or less, from the viewpoint of compatibility between the hydrolyzed starch and the furan resin and the viewpoint of mold strength.
  • the content of the hydrolyzed starch is preferably from 1 to 20% by mass, more preferably from 2 to 10% by mass from the viewpoints of economy, compatibility of the hydrolyzed starch and the furan resin, and mold strength. preferable.
  • the binder composition of the present embodiment may contain a curing accelerator from the viewpoint of preventing mold cracking 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 a phenol derivative
  • aromatic dialdehyde aromatic dialdehyde
  • tannin One or more selected from the group consisting of
  • X 1 and X 2 each represent a hydrogen atom, CH 3 or C 2 H 5 .
  • the content of the curing accelerator in the binder composition is preferably 0.5% by mass or more, more preferably 1.8% by mass or more. , 2.5% by mass or more, even more preferably 3.0% by mass or more.
  • the content of the curing accelerator in the binder composition is preferably 63% by mass or less from the viewpoint of solubility of the curing accelerator in the furan resin and improving the final strength of the mold, and is preferably 50% by mass or less. %, More preferably 40% by weight or less.
  • Examples of the curing accelerator (1) include 2,5-bishydroxymethylfuran, 2,5-bismethoxymethylfuran, 2,5-bisethoxymethylfuran, 2-hydroxymethyl-5-methoxymethylfuran, and 2-hydroxymethylfuran.
  • Methyl-5-ethoxymethylfuran and 2-methoxymethyl-5-ethoxymethylfuran are exemplified. Among them, it is preferable to use 2,5-bishydroxymethylfuran from the viewpoint of improving the final mold strength.
  • phenol derivative examples include resorcin, cresol, hydroquinone, phloroglucinol, and methylenebisphenol.
  • resorcinol is preferable from the viewpoint of the deep curing property of the mold and the viewpoint of improving the final mold strength.
  • the content of the phenol derivative in the binder composition is preferably 1 to 25% by mass from the viewpoint of the solubility of the phenol derivative in the furan resin and from the viewpoint of improving the final mold strength.
  • the content is more preferably 2 to 15% by mass, and still more preferably 3 to 10% by mass.
  • the content of resorcin in the binder composition is from 1 to 10% by mass from the viewpoint of solubility of resorcin in furan resin and improving final mold strength. Is preferably 2 to 7% by mass, and more preferably 3 to 6% by mass.
  • Aromatic dialdehydes include terephthalaldehyde, phthalaldehyde, isophthalaldehyde, and the like, 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 the mold from cracking, terephthalaldehyde and terephthalaldehyde derivatives are preferable, and terephthalaldehyde is more preferable.
  • the content of the aromatic dialdehyde in the binder composition is preferably 0.1 to 0.1 from the viewpoint of sufficiently dissolving the aromatic dialdehyde in the furan resin and suppressing the odor of the aromatic dialdehyde itself.
  • the content is 15% by mass, more preferably 0.5 to 10% by mass, and still more preferably 1 to 5% by mass.
  • the tannins include condensed tannins and hydrolyzed tannins.
  • condensed tannins and hydrolyzable tannins include tannins having a pyrogallol skeleton and a resorcinol skeleton.
  • bark extracts containing these tannins or extracts from natural products such as plant-derived leaves, fruits, seeds, and galls parasitic on plants may be added.
  • the binder composition may further contain an additive such as a silane coupling agent.
  • a silane coupling agent include N- ⁇ - (aminoethyl) - ⁇ -aminopropylmethyldimethoxysilane, N- ⁇ - (aminoethyl) - ⁇ -aminopropyltrimethoxysilane, N- ⁇ - (aminoethyl)- aminosilanes such as ⁇ -aminopropyltriethoxysilane and 3-aminopropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, and 3-glycidoxypropylmethyldiethoxysilane And epoxyglycols such as 3-glycidoxypropyltriethoxysi
  • aminosilane epoxysilane and ureidosilane. More preferred are aminosilane and epoxysilane, and even more preferred are aminosilane.
  • aminosilanes N- ⁇ - (aminoethyl) - ⁇ -aminopropylmethyldimethoxysilane is preferred.
  • the content of the silane coupling agent in the binder composition is preferably 0.01% by mass or more, and more preferably 0.05% by mass or more. From the same viewpoint, the content of the silane coupling agent in the binder composition is preferably equal to or less than 1.0% by mass, and more preferably equal to or less than 0.5% by mass.
  • the binder composition may contain one or more alcohols selected from the group consisting of methanol, ethanol, ethylene glycol, propylene glycol, and glycerin from the viewpoint of reducing economic costs.
  • the content of the alcohol is preferably 1% by mass or more, more preferably 2% by mass or more.
  • the content of the alcohol is preferably 10% by mass or less from the viewpoint of suppressing a decrease in strength of the mold.
  • the content of the alcohol is preferably 1 to 10% by mass, more preferably 2 to 10% by mass, from the viewpoint of preventing freezing in a low-temperature environment and suppressing the reduction in strength of the mold.
  • the binder composition may contain urea from the viewpoint of improving mold strength.
  • the urea is urea that has not been condensed with formaldehyde, furfuryl alcohol, or the like, and may be either remaining as an unreacted component or separately added.
  • the content of the urea in the binder composition is preferably 0.5% by mass or more, more preferably 0.8% by mass or more, from the viewpoint of improving the mold strength and reducing the formaldehyde concentration. 0 mass% or more is more preferable.
  • the content of the urea in the binder composition is preferably 10% by mass or less, more preferably 6.0% by mass or less, from the viewpoint of improving the curing speed and the storage stability of the binder composition. It is more preferably at most 4.5% by mass.
  • the urea in the binder composition can be measured by the following LC / MS analysis operation.
  • the binder composition may contain a phenol resin from the viewpoint of improving the flexibility of the mold and improving the final strength of the mold.
  • phenol resin include those having a weight average molecular weight of 1,000 to 5,000.
  • the phenolic resin has a weight average molecular weight of preferably 1000 or more, more preferably 1400 or more, from the viewpoint of improving the mold flexibility and the final strength of the mold. From the same viewpoint, it is preferably 5000 or less, more preferably 2500 or less. Therefore, it is preferably from 1,000 to 5,000, more preferably from 1,400 to 2,500.
  • the dispersity (the ratio of weight average molecular weight / number average molecular weight) of the phenol resin is preferably 1.2 or more, and more preferably 1.8 or more, from the viewpoint of improving the flexibility of the mold and improving the final strength of the mold. Is more preferred.
  • the weight average molecular weight of the phenolic resin is preferably 5.0 or less from the viewpoint of improving the storage stability of the binder composition, improving the flexibility of the mold and improving the final strength of the mold, 3.5 or less is more preferable. Therefore, 1.2 to 5.0 is preferable, and 1.8 to 3.5 is more preferable.
  • phenol resin conventionally known ones can be used.
  • a resol type phenol resin, a novolak type phenol resin, and a phenol resin having a structure as described in Japanese Patent Application No. 2009-292862 are used.
  • Those composed of one selected from the group or those composed of a mixture of two or more selected from these groups can be used.
  • phenols used to obtain a resol type phenol resin include phenol, cresol, xylenol, and the like, but among these, a viewpoint of improving the flexibility of the mold and a viewpoint of improving the final strength of the mold.
  • phenol is preferred.
  • aldehydes used for obtaining the resole type phenol resin include formaldehyde, glyoxal, paraformaldehyde, furfural, 5-hydroxymethylfurfural and the like, but from the viewpoint of improving the flexibility of the mold and the final strength of the mold.
  • Paraformaldehyde is preferred from the viewpoint of improving the odor.
  • the basic catalyst used for obtaining the resole type phenol resin include potassium hydroxide, sodium hydroxide and the like.
  • the phenols and aldehydes used to obtain a novolak phenol resin include the same phenols and aldehydes as the resol phenol resin.
  • raw materials, water contained in the raw materials, and water generated during the reaction are contained in addition to the phenolic resin, but may not be removed from the viewpoint of economy.
  • phenolic resins it is preferable to use a resol-type phenolic resin from the viewpoint of solubility, improving the flexibility of the mold, and improving the final strength of the mold.
  • the content of the phenol resin in the binder composition is 2% by mass or more and 35% by mass or less from the viewpoint of solubility, improving the flexibility of the mold, and improving the final strength of the mold. .
  • the content of the phenol resin in the binder composition is more preferably 8% by mass or more from the viewpoint of improving the mold flexibility and the final strength of the mold.
  • the content of the phenol resin in the binder composition is more preferably 20% by mass or less from the viewpoint of solubility, improving the flexibility of the mold, and improving the final strength of the mold. Therefore, 8 to 20% by mass is more preferable.
  • the total content of the furan resin and the phenol resin in the binder composition is preferably 50% by mass or more from the viewpoint of improving the final strength of the mold.
  • the total content of the furan resin and the phenol resin in the binder composition is preferably 95% by mass or less from the viewpoint of improving the final strength of the mold. Therefore, 50 to 95% by mass is preferable.
  • the binder composition is suitably used for molding a self-hardening mold.
  • the self-hardening mold is a mold in which when a binder composition and a curing agent composition are mixed with sand, a polymerization reaction proceeds with the passage of time and the mold is cured.
  • the temperature of the sand used at that time is in the range of ⁇ 20 ° C. to 50 ° C., preferably 0 ° C. to 40 ° C.
  • a proper amount of a curing agent is selected and added to the sand, whereby the mold can be appropriately cured.
  • the binder composition can be mixed with the refractory particles and the hardener composition to form a mold composition.
  • the composition for a mold of the present embodiment contains the binder composition, the refractory particles, and the curing agent composition.
  • Refractory particles As the refractory particles, silica sand, chromite sand, zircon sand, olivine sand, alumina sand, mullite sand, conventionally known ones such as synthetic mullite sand can be used, and those obtained by collecting used refractory particles and Those that have been reproduced can also be used.
  • the curing agent composition can be used without any particular limitation as long as it contains a curing agent for curing the binder composition.
  • the curing agent include acid-based curing agents, such as sulfonic acid compounds such as xylene sulfonic acid (particularly, m-xylene sulfonic acid), toluene sulfonic acid (particularly, p-toluene sulfonic acid), methane sulfonic acid, and the like.
  • One or more conventionally known compounds such as an acid, a phosphoric acid compound such as an acidic phosphoric ester, an acidic aqueous solution containing sulfuric acid and the like can be used. These compounds are preferably aqueous solutions from the viewpoint of handleability.
  • the curing agent may contain one or more solvents selected from the group consisting of alcohols, ether alcohols and esters, and carboxylic acids.
  • the content of the curing agent in the curing agent composition is preferably from 5 to 50% by mass, and more preferably from 10 to 40% by mass, from the viewpoint of ultimately improving the strength of the mold.
  • the composition for a mold contains 0.5 to 3.0 parts by mass of the binder composition and 0.07 to 2.0 parts by mass of the curing agent composition based on 100 parts by mass of the refractory particles. Is preferred.
  • the content of the curing agent composition in the composition for a mold is preferably 0.1 part by mass or more, more preferably 0 part by mass, based on 1.0 part by mass of the binder composition from the viewpoint of improving the mold strength. .14 parts by mass or more, more preferably 0.2 parts by mass or more, preferably 0.8 parts by mass or less, more preferably 0.6 parts by mass or less, still more preferably 0.4 parts by mass or less.
  • the content of the curing agent composition in the composition for a mold is preferably 0.1 to 0.8 parts by mass with respect to 1.0 part by mass of the binder composition from the viewpoint of improving mold strength. Parts, more preferably 0.14 to 0.6 parts by mass, even more preferably 0.2 to 0.4 parts by mass.
  • a mold can be produced by curing the mold composition.
  • the mold can be manufactured by using the conventional mold manufacturing process as it is.
  • As a preferred method for producing a mold mixing the refractory particles, the binder composition for mold molding, and a curing agent composition for curing the binder composition for mold molding to obtain a composition for mold.
  • a method for producing a mold having a curing step of packing the mold composition into a mold and curing the mold composition are examples of the mold composition.
  • the mixing step includes a first mixing step of mixing the refractory particles and a curing agent composition for mold molding containing the curing agent composition, and a binder composition for mold molding added to the mixture obtained after the first mixing step. It is preferable to have a second mixing step of mixing the substances.
  • an acid-curable resin In the mixing step, an acid-curable resin, a curing accelerator, water, additives such as a silane coupling agent, an acidic substance, and a solvent may be added to such an extent that the effects of the present embodiment are not impaired.
  • a known general method can be used, for example, a method of adding and mixing the respective raw materials by a batch mixer, or a method of supplying the respective raw materials to a continuous mixer and kneading. Method.
  • the composition of the furan resin composition was 71.7% by mass of a urea-modified furan resin, 19.5% by mass of furfuryl alcohol, and 8.8% by mass of water.
  • [Dextrose equivalent] Precisely weigh 2.5 g of sample and dissolve in water to make 200 mL. 10 mL of this solution was accurately measured, 10 mL of a 0.04 mol / L iodine solution and 15 mL of a 0.04 mol / L sodium hydroxide solution were added, and the mixture was left in a dark place for 20 minutes. Next, 5 mL of 2 mol / L hydrochloric acid was added and mixed, and then titrated with a 0.04 mol / L sodium thiosulfate solution.
  • the strength (MPa) was measured.
  • the binder composition used in preparing the composition for a mold was used after shaking the one that had been stored at room temperature for one week. Table 1 shows the results. In Examples 1 to 9, the pressure was 4.7 MPa or more.
  • Comparative Examples 1 to 4 had a compression strength of 4.4 MPa or less and low compressive strength. This is considered to be due to the fact that in the comparative example, the hydrolyzed starch was phase-separated in the binder composition, and the hydrolyzed starch was agglomerated in the mold composition.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)

Abstract

La composition de liant pour former un moule selon la présente invention contient une résine furannique, de l'eau et de l'amidon hydrolysé, le rapport en masse de la résine furannique et de l'amidon hydrolysé (masse de résine furannique/masse d'amidon hydrolysé) est de 20 à 95, et l'amidon hydrolysé a un équivalent dextrose supérieur ou égal à 60. La présente invention peut fournir une composition de liant qui est destinée à former un moule et qui ne nécessite pas d'étape de modification même lors de l'utilisation d'un sucre, ce qui entraîne une réduction du coût économique et du coût énergétique.
PCT/JP2018/037004 2018-10-03 2018-10-03 Composition de liant pour former un moule WO2020070819A1 (fr)

Priority Applications (3)

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JP2020550999A JP6971412B2 (ja) 2018-10-03 2018-10-03 鋳型造型用粘結剤組成物
PCT/JP2018/037004 WO2020070819A1 (fr) 2018-10-03 2018-10-03 Composition de liant pour former un moule
CN201880093796.6A CN112203784A (zh) 2018-10-03 2018-10-03 铸型造型用粘结剂组合物

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PCT/JP2018/037004 WO2020070819A1 (fr) 2018-10-03 2018-10-03 Composition de liant pour former un moule

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WO2020070819A1 true WO2020070819A1 (fr) 2020-04-09

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JPS63174754A (ja) * 1987-01-14 1988-07-19 Sadaji Nagabori 無塗型鋳造に適した鋳物用砂型または中子のバツチ式製造方法および製造装置
JPS63174752A (ja) * 1987-01-14 1988-07-19 Sadaji Nagabori 無塗型鋳造に適した鋳物用砂型または中子の連続式製造方法および製造装置
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