EP2892670A2 - Procédé d'obtention d'un corps pour fonderie à partir d'un mélange granulaire comprenant une résine polycondensée modifée et un capteur de formaldéhyde - Google Patents
Procédé d'obtention d'un corps pour fonderie à partir d'un mélange granulaire comprenant une résine polycondensée modifée et un capteur de formaldéhydeInfo
- Publication number
- EP2892670A2 EP2892670A2 EP13774731.7A EP13774731A EP2892670A2 EP 2892670 A2 EP2892670 A2 EP 2892670A2 EP 13774731 A EP13774731 A EP 13774731A EP 2892670 A2 EP2892670 A2 EP 2892670A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- resin
- formaldehyde
- group
- mixture
- metal
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Classifications
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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
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
- B22C9/123—Gas-hardening
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
- B22D21/02—Casting exceedingly oxidisable non-ferrous metals, e.g. in inert atmosphere
- B22D21/04—Casting aluminium or magnesium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
Definitions
- the present invention relates to a process for obtaining a foundry body from a granular mixture comprising a modified polycondensed resin, and a formaldehyde sensor, and the foundry body obtained by said method.
- hot box type industrial processes use resins.
- the resins are intimately mixed with the substance or substances to be agglomerated, or spread on the surface to be bonded, in association with a hardening agent whose function is most often to render the solid reaction medium in situ.
- granular or fibrous filler such as, for example, mineral or synthetic sands, glass micro-beads, ceramic micro-beads and fibers which are most often ligno-lined. cellulose.
- the substance to be agglomerated is generally fluid, most often viscous.
- the substance to be agglomerated is then brought into contact with or in a forming tool, and then heated, the heat being generally provided by the heating of the forming tool (or forming tooling).
- body is meant according to the invention a material object occupying a portion of space and having particular properties.
- the body according to the invention is most often in a solid continuous medium, that is to say of clean form and substantially invariable volume.
- a fluid body is generally a body constituting a deformable continuous medium.
- thermoset resins hot and in acidic medium, by polymerization.
- molds and cores are generally solid bodies, which can be manufactured by a "hot box” type process from a granular charge.
- the corresponding mold or core is destroyed by burning the resin in contact with the metal. This involves producing a set of molds or kernels per piece produced.
- the resins content calculated as dry extract, are extremely low, most often in a range of 0.3 to 3% by weight by weight. relative to the mass of the granular charge to be agglomerated.
- the chemical nature of the combustion gases is important, both for the quality of cast metal parts and for the health of workers.
- the production of molds and cores must be done at high speeds of up to a few thousand pieces per day.
- the forming tools or core boxes are metallic because the heating temperatures to obtain rapid polymerization of the resins are high, generally greater than 150 ° C and up to 380 ° C. This involves significant tooling costs and especially dimensional accuracy problems of molds and cores, related to the expansion of tools under the effect of heat.
- respiratory nuisances for people working in this environment have been deemed inadmissible.
- the French patent application FR 2948307 relates to a method for producing a body comprising a conventional polycondensed resin, preferably a urea-formaldehyde resin, and a free formaldehyde sensor, which is preferably carbohydrazide.
- US patent application 2007/0149644 discloses the use of tannin extract in a foundry mixture comprising an aggregate and a binder of tannin extract and furfuryl alcohol.
- This binder does not necessarily contain resin, because the two components of the binder react together at a temperature above 40 ° C.
- this invention can not be implemented in industry because furfuryl alcohol is a compound now classified as carcinogenic.
- the foundry mix of this document apparently does not generate free formaldehyde or phenol free. Thus, according to the text of this document, no formaldehyde sensor seems necessary in this context.
- Patent application WO 2004/058843 discloses a resin-based composition
- a resin-based composition comprising tannin, an amine compound, an aldehyde and a stabilizer.
- the compound containing amino groups may be urea or an oligomer derived from the urea-formaldehyde condensation.
- the stabilizer is preferably an amino-based heterocyclic compound.
- a method for preparing this composition as well as the use of this composition for producing a mixture comprising particles, for the purpose of creating particle boards, including wood particles.
- the compositions of this document do not include a formaldehyde sensor, since it is explained that the free formaldehyde from the resin will react with the tannin during the formation of the composition. In fact, the presence of free formaldehyde is proven and is problematic.
- the present invention relates to a method for producing a body, preferably a casting mold and / or core, said method comprising at least the following successive steps:
- At least 90%, preferably from 96 to 99%, by weight of grains said grains being mainly composed of at least one mineral oxide, and at least 80% of said grains having a size of 10 to 3000 ⁇ , b- from 0.3 to 3%, preferably from 0.6 to 1.5%, by weight of at least one polycondensed resin with formaldehyde and / or its derivatives, the percentage being calculated as solids content of resin,
- d- from 0.003 to 1%, preferably from 0.01 to 0.15%, by weight of at least one formaldehyde-sensing compound, and
- an e-component in the mixture at a content of 0.003% to 1.5%, preferably from 0.15% to 1%, by weight relative to the total weight of the mixture, at least one resin selected from the group consisting of tannins, natural polyphenols, and lignins,
- the polycondensed resin with formaldehyde and / or its derivatives (component b-) is modified by the presence of aromatic and / or polyaromatic groups in the mixture.
- the polycondensed resin with formaldehyde and / or its derivatives (component b-) is preferably a furanic resin, an aminoplast, a phenoplast or a copolymer of at least two of these three compounds.
- the formaldehyde sensor (component d-) is generally, according to the invention, a compound of the family of hydrazides, preferably chosen from the group formed by mono and dihydrazides, the said sensor being even more preferably the dihydrazide of the acid. adipic acid, succinic acid dihydrazide, or carbohydrazide. In a particularly preferred manner, the formaldehyde sensor is carbohydrazide.
- the resin selected from the group consisting of tannins, natural polyphenols, and lignins (component e-) is preferably a tannin type resin, even more preferably a condensed tannin type resin.
- the component e) is a resin by itself, and is generally added to the component b) premix (such a diluent if the two components are liquid). Its presence modifies the behavior of the polycondensed resin (component b), which is a "modified" resin during its implementation) in the mixture during the implementation of the process according to the invention.
- the component f), which is water may be previously incorporated, in whole or in part, at least one of the other components.
- the blowing step makes it possible to implement at least partially at least one chemical reaction which ensures the at least partial hardening of said mixture.
- the process according to the invention makes it particularly possible, in the case of the use of the body thus obtained for cast iron casting, to reduce the production of formaldehyde during the reaction, to reduce the nitrogen content generated. in the formed body, to enrich the formed body in carbon and to improve the thermal resistance during the process.
- the granular mixture may comprise any other additive known to those skilled in the art.
- the granular mixture may comprise any additive, liquid or powder, known to those skilled in the art to promote the physico-chemical behavior of the mixture during its processing and its subsequent use.
- the grains of the granular mixture according to the invention are generally natural or synthetic.
- the grains are grains of inorganic oxide (s), most often natural siliceous sandy mixtures whose grains are composed mainly of silicon oxide and whose particle size AFS (acronym for "American Foundry Society”). Can range from 30 to 140.
- the water is generally provided in the granular mixture mainly as a solvent of components b) to d), optionally e), of the granular mixture.
- the curing agent is generally incorporated at a very low level in the granular mixture, its dispersion is improved if it is previously diluted in aqueous solution. It is the same for the formaldehyde sensor and the component e), if it is provided in powder form.
- the granular mixture according to the invention is generally in the form of at least one fluid aggregate.
- the surface of the forming tool with which the granular mixture is in contact generally represents the "negative" of the part to be formed in the body manufactured according to the invention.
- the step of blowing a flow of hot gas is generally such that the temperature and the flow rate of said flow are adjusted to cause the elevation of the temperature at the heart of the granular mixture, substantially above the ambient temperature (which is about 20 ° C) and preferably above 45 ° C.
- the process according to the invention by the presence in the granular mixture of at least one formaldehyde sensor and a modified polycondensed resin, advantageously makes it possible to significantly improve the thermal properties of the granular mixture and to limit the emission of formaldehyde free when performing formed bodies.
- the presence of a modified polycondensed resin makes it possible to significantly improve the thermal properties and to reduce the nitrogen content of the bodies formed.
- the method according to the invention is such that, in addition, the forming tool is heated to a temperature in the range of 40 ° C to 180 ° C, preferably 50 ° C to 150 ° C. This is generally done in the contacting step, and at the latest during the blowing step.
- the heat provided by the hot gas is supplemented by the heat of heating of the forming tool, so as to optimize, in a preferred version of the invention, the heating of the granular mixture.
- the gas is preferably selected from the group consisting of air, a neutral gas and a gas involved in the acidification of the reaction medium.
- the term "neutral gas” means a gas which does not participate in the reaction, for example chosen from dinitrogen and the so-called noble gases such as helium, neon and argon.
- gas involved in the acidification of the reaction medium is meant according to the invention a gas for decreasing in situ the pH of the medium such as carbon dioxide or sulfur dioxide.
- the method also comprises an additional step during which a flow of at least one gas is circulated within the at least partially hardened granular mixture at a temperature within a range of 5 ° C to 45 ° C, for a time in a range of 1 to 300 seconds, the gas being preferably selected from the group consisting of air, nitrogen and carbon dioxide. This step is most often carried out before the optional step of removing the body from the forming tool.
- the gas is usually not previously heated, and therefore substantially at room temperature, or possibly cooled.
- formaldehyde by blocking the polymerization reaction of the modified polycondensed resin by cooling the body after partial curing.
- this flow of gas advantageously makes it possible to wash with a flow of air, of nitrogen or of carbon dioxide, the free formaldehyde which may be residual.
- polycondensed resin or polycondensed resin with formaldehyde and / or its derivatives a composition of at least one resin having undergone a chemical reaction between a first element selected from urea and its derivatives, melamine, benzoguanamine, glycoluril, phenol and / or its derivatives, and furfuryl alcohol and / or its derivatives, and a second element selected from formaldehyde and / or its derivatives, wherein preferably the chain growth generally causes at each stage the release of a molecule of water.
- This polycondensed resin is generally a thermosetting polymer, such as a furan resin or an aminoplast or a phenoplast or a copolymer of these compounds, preferably an aminoplast or a phenoplast or an aminoplast-phenoplast copolymer.
- the aminoplasts are obtained by polycondensation of the first comonomer which is formaldehyde and the second comonomer carrying amino groups NH 2 -. They are usually divided into two families compounds, namely urea-formaldehyde (or urea-formaldehyde) (UF) and melamine-formaldehyde (or melamine-formaldehyde) resins (MF).
- urea-formaldehyde or urea-formaldehyde
- MF melamine-formaldehyde
- Phenoplasts or phenol-formaldehyde resins are obtained by polycondensation between a first comonomer that is formaldehyde and a second comonomer that is phenol.
- phenolic resins There are two types of phenolic resins: novolacs, prepared by acid catalysis, and the resols, obtained by basic catalysis.
- the best known phenoplast is bakelite ® (or polyoxybenzylmethylene glycol anhydride), which is the oldest industrial synthetic polymer material.
- the furanic resin is obtained by polycondensation of the first comonomer furfuryl alcohol and the second comonomer is formaldehyde.
- the component (s) of the polycondensed resin may remain free in excess in the polycondensed resin, or may have been added thereto after the polycondensation.
- the polycondensed resin with formaldehyde and / or its derivatives is generally such that it thermosets in acidic medium.
- Such a polycondensed resin is generally commercially available.
- the polycondensed resin may, according to the invention, be modified by the presence during its synthesis of a compound comprising at least one phenolic and / or polyphenolic unit, at a content of 1 to 30% by weight, preferably from 5 to 20% by weight, relative to the total weight of the modified polycondensate resin. It is therefore not the polycondensed resin described in the French patent application FR 2948307. In fact, it comprises groups which are derived from the precursor groups which are the phenolic and / or polyphenolic units, preferably present in a compound such as vanillin and phloroglucinol. This compound is generally mixed with the resin prior to its synthesis and the derived groups "hang" on the resin during its synthesis.
- the polycondensed resin may thus have been premixed with a compound, most often synthetic, such as vanillin or phloroglucinol.
- a component e) according to the invention ie the resin selected from the group formed by tannins, natural polyphenols, and lignins, is optional.
- the phenolic and / or polyphenolic unit may be of natural or synthetic origin.
- the resin is thus in the form of a formophenolic copolymer.
- the polycondensed resin with formaldehyde and / or its derivatives according to the invention may also optionally contain at least one additive chosen from solvents, diluents, stabilizers and solid particle fillers, which are usually used and known to those skilled in the art to obtain a particular effect.
- said polycondensed resin may contain at least one silane, which generally makes it possible to bridge, and thus optimize, the bond between the resin and the grains.
- the resin selected from the group consisting of tannins, natural polyphenols, and lignins is a natural polymer rich in aromatic rings (i.e. having at least two aromatic rings). In reality, this resin contains at least one aromatic nucleus per monomer unit of the polymer, thus a plurality of aromatic nuclei.
- This resin is chosen according to the invention from the group formed by tannins, which are generally of natural origin, preferably condensed and / or modified to make them soluble in water, such as extracts from the Quebracho tree, natural polyphenols, such as those extracted from araucaria angustifolia (Paranâ € TM s pine) or pinus palustris (swamp pine), and lignins, modified or not.
- the resin selected from the group formed by tannins, natural polyphenols, and lignins is most often renewable.
- renewable resin means, according to the invention, either a natural resin whose stock can be reconstituted over a short period on a human scale, or a synthetic resin whose main synthetic starting materials are renewable components; in theory renewal must be done at least as fast as consumption.
- the resin selected from the group consisting of tannins, natural polyphenols, and lignins is a tannin-type resin, and even more preferably it is a condensed tannin-type resin.
- the tannin type resin is usually a natural phenolic substance. It is usually a secondary metabolite of superior plant that is found practically in all parts of plants (bark, roots, leaves, stems, etc.).
- the tannins are polyphenol natural resins either monosaccharide type polyols and galloyl units or derivatives thereof, linked to flavonoids or triterpenoids, or oligomers or flavanol polymers.
- the tannins used according to the invention are polyflavonoids, for example of the tannin type of the Quebracho tree.
- Lignins are polymers based on one or more monolignols, such as paracoumaryl alcohol, coniferyl alcohol and sinapyl alcohol.
- the lignins may, for example, be modified to lignosulphonates by reactions with bisulphites.
- the resin selected from the group consisting of tannins, natural polyphenols, and lignins may also be a thermoplastic resin, for example, an extract of araucaria angustifolia (Paranâ € TM s pine) or pinus palustris (swamp pine).
- the resin selected from the group consisting of tannins, natural polyphenols, and lignins can be composed of long-chain aliphatic phenols such as cashew nut shell extract.
- the resin selected from the group formed by tannins, natural polyphenols, and lignins can be a commercial compound such as the following commercial products: Respine RLP from the company POLYTRADE (natural aromatic resin from araucaria angustifolia); VINSOL ® from HERCULES (consisting of approximately 57% polyphenols, 28% rosin and 15% terpenoid); QSF (alcohol-soluble part of tannins de Quebracho), FINTAN 737B (modified condensed tannin from Schinopsis lorentzii or Quebracho Colorado powder) and FINTAN 737C (stabilized condensed tannin from Schinopsis lorentzii or Quebracho Colorado in 45% solution) from INDUNOR; and CARDANOL (long-chain aliphatic phenols from cashew shells) from SAI CHEMICALS.
- Respine RLP from the company POLYTRADE (natural aromatic resin from araucaria angustifolia); VINSOL ® from HERCU
- the curing agent is generally selected from the group consisting of the following compounds:
- salts such as ammonium salts, in particular persulfates, nitrates, bisulphates, sulphates and chlorides;
- acid-generating salts by reaction with an aldehyde, such as hydroxylamine salts, especially sulphates, hydrochlorides, phosphates, sulphonates and hydroxylamine nitrates;
- an aldehyde such as hydroxylamine salts, especially sulphates, hydrochlorides, phosphates, sulphonates and hydroxylamine nitrates;
- sublimable acids in particular oxalic acid and benzoic acid
- organic acids compatible with the process with regard to their reactivity and toxicity, such as lactic acid and citric acid.
- the curing agent is more generally such that it renders the reaction medium of the acid mixture, either by its own acidity, or by its ability to release acid during the polymerization process.
- the curing agent is selected from the group consisting of hydroxylamine salts, and even more preferably, the curing agent is hydroxylamine sulfate.
- the hydroxylamine salts advantageously release an acid in the presence of formaldehyde.
- the curing agent is a hydroxylamine salt
- the free formaldehyde available combines primarily with this hydroxylamine salt to release an acid, and that the formaldehyde sensor does not inhibit or little acid formation by said salt during the curing reaction.
- hydroxylamine salt significantly and advantageously improves the process according to the invention, by accelerating the hardening kinetics and by increasing the acidity of the reaction medium as the thermosetting reaction releases formaldehyde.
- the production of the granular mixture according to the first step of the process of the invention is generally carried out in a manner known to those skilled in the art.
- those skilled in the art first introduce the granular part or parts into a mixer and then proceed to the introduction of liquid parts, the mixing time being a function of the material and preferably from 15 s to 5 min.
- the invention particularly relates to a method of manufacturing a casting piece of metal, or metal alloy, molded, which comprises casting a metal, or metal alloy, liquid in at least one mold and / or core, characterized in that said mold is a body obtained by the process according to the invention as described above.
- such a method is such that the metal, or metal alloy, is selected from the group formed by aluminum, the ferrous alloys selected from the group consisting of steels and cast irons, non-ferrous metals, non-alloys ferrous, and, more preferably, the metal or metal alloy is selected from the group formed by the fonts.
- the invention also relates to any molded metal part obtained by a manufacturing method as described above.
- the invention further relates to any mechanical assembly comprising at least one such piece.
- FIG. 1 represents curves A, B, C, D and E of P (in percentage) as a function of time t (in minutes) for five different resins described in the examples, that is to say that each curve represents the percentage of passing as a function of time for the resin concerned. This makes it possible to evaluate the thermal resistance.
- a premix was made comprising mainly the polycondensed resin (component b) and optionally a resin selected from the group consisting of tannins, natural polyphenols, and lignins (component e)), and a second premix a was performed comprising the curing agent (component c)) and optionally a formaldehyde sensor compound (component d)). Water was generally present in these two premixes. Then, the granular mixture was made by mixing the siliceous sand, the first premix and the second premix. This granular mixture was carried out in a vibratory bowl mixer with a mixing time of 60 seconds.
- the granular mixture was then blown into a box equipped with a heating system and a supply of hot air (at 100-120 ° C) at a pressure of 1.5 bar (0.15 MPa), for a period of 60 seconds, containing two test pieces of standardized mechanical characteristics of square section 5 cm 2 , on a ROPER machine.
- Curing was performed according to the data indicated for each granular mixture.
- the measurement of formaldehyde during mixing was carried out using the DRAGER model Accuro pump equipment equipped with DRAGER "formaldehyde” dosing tubes (0.2 / a). The range of measurements is 0.2 to 5 ppm. The measurements were made above the vibrating bowl of the mixer.
- the formaldehyde removal measurement was carried out using the DRAGER model Accuro pump equipment fitted with DRAGER "formaldehyde" dosing tubes (0.2 / a or 2 / a), depending on the concentration to be measured in a 10 liter chamber in which circulated a flow of nitrogen of 0.5 L / min.
- a test tube was placed in the enclosure as soon as it came out of the box.
- the flexural strengths were measured both hot and cold after a cooking time of 15 seconds, 30 seconds, 60 seconds and 120 seconds in a can.
- the detection at the end of dislocation (or extraction) of a content of formaldehyde (free) more than 20 times lower than the conventional hot box process is considered to make the shaped body suitable for industrial use.
- the dry extract expressed in% by weight is the residue produced after heating one gram of product at 135 ° C. for one hour.
- test pieces obtained are solid formed bodies that can be assimilated to nuclei.
- the rate of disintegration of the granular body at 450 ° C was measured under the following conditions:
- Molded bodies of parallelepipedal shape of square section 5 cm 2 were made. The molded bodies were then left for 24 hours at rest.
- the cubes were placed separately in crucibles closed by a lid.
- the crucibles were spotted.
- the crucibles were then placed in a muffle furnace regulated at 450 ° C, a timer having been triggered when the oven was closed.
- the crucibles were removed from the oven at regular intervals (for example 5-
- the pass-through portion was recovered, weighed and the resulting mass converted to percent.
- Resin Urea-formaldehyde resin, commercial product Cleantech 11 R26, synthesized in an acidic medium with a formaldehyde / urea molar ratio of 2.37 (used at 2.0% relative to sand)
- Catalyst Cleantech 14D38 commercial product from Hiittenes Albertus France containing 3% hydroxylamine sulfate, 15% carbohydrazide and 82% water (used at 0.4% relative to sand)
- Hot air temperature 100-120 ° C
- Hot bending resistance at the box outlet at 30, 60 and 120 seconds respectively: 18, 32 and 55 daN / cm 2
- the hot and cold bending resistances are sufficient to allow, respectively, the manipulation of the formed bodies and the casting of the metal.
- Formaldehyde with mixing less than 0.2 ppm (not detectable)
- Formaldehyde emissions at mixing and disbudding are extremely low (at debugging approximately 600 times lower than the hot box process represented by Example 3).
- the thermal resistance expressed by this percentage, is incompatible with the casting of cast iron casting parts.
- Resin Resin urea-melamine / formalin referenced FUM274 synthesized with a formaldehyde / urea molar ratio of 2.95 and a formaldehyde / melamine molar ratio of 3.45 (used at 2% relative to sand)
- Catalyst referenced UFAC 12/268 containing (20%) hydroxylamine sulfate and (80%) water (used at 0.4% relative to sand)
- Hot air temperature 100-120 ° C
- Hot bending resistance at the box outlet at 30, 60 and 120 seconds respectively: 17, 24 and 44 daN / cm 2
- the hot and cold bending resistances are sufficient to allow, respectively, the manipulation of the formed bodies and the casting of the metal.
- the thermal resistance is sufficient for the casting of cast iron casting parts.
- Resin Urea-phenol / formaldehyde resin, commercial product Resital 12B62 from Hiittenes Albertus France.
- This resin is characteristic of the "hot box” process, and was used at 2% compared to sand.
- Catalyst Commercial product Harter AT3B from Hiittenes Albertus France (50% magnesium lignosulfonate solution), urea and ammonium nitrate.
- This catalyst was used at 0.5% with respect to the sand.
- This resin is characteristic of the "hot box” process used in cast iron foundries.
- Hot bending resistance at the box outlet at 30, 60 and 120 seconds respectively: 34, 51 and 61 daN / cm 2
- the hot and cold bending resistances are sufficient to allow, respectively, the manipulation of the formed bodies and the casting of the metal.
- Formaldehyde emissions during mixing and disintegration are incompatible with changes in hygiene and safety standards.
- Urea-formaldehyde resin comprising vanillin, which has been synthesized in an acidic medium with a formaldehyde / urea mole ratio of 2.37, and to which vanillin has been added in a molar ratio of urea to vanillin of 4, 5.
- the vanillin content with respect to the resin is 11.3% by weight.
- This resin was used at 2% relative to sand.
- Catalyst consisting of 1.4% hydroxylamine in 50% solution, 1.7% p-toluenesulfonic acid in 65% solution, 15.1% carbohydrazide, 2.2% hydroxylamine sulfate and 79.7% water.
- This catalyst was used at 0.4% relative to sand. Box temperature: 120 ° C
- Hot air temperature 100-120 ° C
- Hot bending resistance at the box outlet at 30, 60 and 120 seconds respectively: 15, 30 and 45 daN / cm 2
- the hot and cold bending resistances are sufficient to allow, respectively, the manipulation of the bodies formed and the casting of the metal.
- Formaldehyde with mixing less than 0.2 ppm (not detectable)
- Formaldehyde in the process of deboning comparative value 2.5
- Formaldehyde emissions during mixing and disbudding are low (at debugging approximately 50 times lower than the hot box process represented by Example 3).
- the thermal resistance expressed by this percentage, is considered sufficient for the casting of cast iron casting parts.
- Urea-melamine / formaldehyde resin which was synthesized with a formaldehyde / urea molar ratio of 2.95 and to which melamine was added in a formaldehyde / melamine molar ratio of 3.45 then in which was added 3% modified tannin Fintan 737B, commercial product of the company Indunor (modified condensed tannin from Schinopsis lorentzii or Quebracho Colorado powder).
- This resin was used at 2.2% relative to the sand.
- Catalyst Catalyst containing 14% hydroxylamine sulfate, 20% carbohydrazide and 66% water.
- This catalyst was used at 0.3% relative to sand. Temperature box: 130 ° C
- Hot air temperature 100-120 ° C
- Hot bending resistance at the box outlet at 30, 60 and 120 seconds respectively: 15, 24 and 42 daN / cm 2
- the hot and cold bending resistances are sufficient to allow, respectively, the manipulation of the bodies formed and the casting of the metal.
- Formaldehyde with mixing less than 0.2 ppm (not detectable)
- Formaldehyde in the process of deboning comparative value 2.5
- Formaldehyde emissions during mixing and disbudding are low (at debugging approximately 50 times lower than the hot box process represented by Example 3).
- the thermal resistance expressed by this percentage, is considered sufficient for the casting of cast iron casting parts.
- Tannin-modified urea / formaldehyde resin which was synthesized with a formaldehyde / urea molar ratio of 2.37, and in which 25% of modified tannin Fintan 737C, a commercial product of Indunor (stabilized condensed tannin derived from Schinopsis lorentzii or Quebracho Colorado in 45% solution).
- This resin was used at 2% relative to sand.
- Catalyst Catalyst containing 14% hydroxylamine sulfate, 20% carbohydrazide and 66% water. This catalyst was used at 0.3% relative to sand.
- Hot air temperature 100-120 ° C
- Hot bending resistance at the box outlet at 15, 30 and 60 seconds respectively: 6, 13 and 21 daN / cm 2
- the hot and cold bending resistances are sufficient to allow, respectively, the manipulation of the bodies formed and the casting of the metal.
- Formaldehyde with mixing less than 0.2 ppm (not detectable)
- Formaldehyde in the process of deboning comparative value 2.5
- Formaldehyde emissions during mixing and disbudding are low (at debugging approximately 50 times lower than the hot box process represented by Example 3).
- the thermal resistance expressed by this percentage is considered sufficient for the casting of cast iron casting parts.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mold Materials And Core Materials (AREA)
- Phenolic Resins Or Amino Resins (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
Claims
Priority Applications (1)
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PL13774731T PL2892670T3 (pl) | 2012-09-10 | 2013-09-10 | Sposób otrzymywania wyrobu dla odlewnictwa z mieszaniny granulowanej obejmującej modyfikowaną żywicę polikondensowaną i łapacz formaldehydu |
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FR1258481A FR2995234B1 (fr) | 2012-09-10 | 2012-09-10 | 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 |
PCT/FR2013/052077 WO2014037681A2 (fr) | 2012-09-10 | 2013-09-10 | Procédé d'obtention d'un corps pour fonderie à partir d'un mélange granulaire comprenant une résine polycondensée modifée et un capteur de formaldéhyde |
Publications (2)
Publication Number | Publication Date |
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EP2892670A2 true EP2892670A2 (fr) | 2015-07-15 |
EP2892670B1 EP2892670B1 (fr) | 2016-09-07 |
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EP13774731.7A Not-in-force EP2892670B1 (fr) | 2012-09-10 | 2013-09-10 | Procédé d'obtention d'un corps pour fonderie à partir d'un mélange granulaire comprenant une résine polycondensée modifée et un capteur de formaldéhyde |
Country Status (9)
Country | Link |
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US (1) | US10137494B2 (fr) |
EP (1) | EP2892670B1 (fr) |
CN (1) | CN104619437B (fr) |
BR (1) | BR112015004908B1 (fr) |
EA (1) | EA028270B1 (fr) |
FR (1) | FR2995234B1 (fr) |
MX (1) | MX347364B (fr) |
PL (1) | PL2892670T3 (fr) |
WO (1) | WO2014037681A2 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
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EP3283541B1 (fr) * | 2015-04-14 | 2023-06-07 | HÜTTENES-ALBERTUS Chemische Werke Gesellschaft mit beschränkter Haftung | Composition de résine phénolique pour une utilisation dans le procédé boîte froide de polyurethane et/ou le procédé durcissant à froid et systèmes de liant à deux composants correspondants, applications et procédé |
JP6895804B2 (ja) * | 2017-05-29 | 2021-06-30 | 花王株式会社 | 鋳型造型用硬化剤組成物 |
DE102018118291A1 (de) * | 2018-07-27 | 2020-01-30 | HÜTTENES-ALBERTUS Chemische Werke Gesellschaft mit beschränkter Haftung | Schlichtezusammensetzung zur Reduzierung von Formaldehyd-Emissionen |
CN112142938A (zh) * | 2019-06-28 | 2020-12-29 | 江苏华岗材料科技发展有限公司 | 一种节能环保呋喃树脂铸造粘合剂的制备方法 |
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JPS6478652A (en) * | 1987-09-21 | 1989-03-24 | Hitachi Chemical Co Ltd | Resin bonder for shell mold |
AU2002953568A0 (en) * | 2002-12-24 | 2003-01-16 | Borden Chemical Australia Pty Ltd | Novel chemical composition, method of making same, and products made therefrom |
US7211137B2 (en) | 2004-10-15 | 2007-05-01 | Ashland Licensing And Intellectual Property Llc | Binder composition comprising condensed tannin and furfuryl alcohol and its uses |
CN101607297B (zh) * | 2009-07-22 | 2010-12-08 | 福州大学 | 铸造用改性酚醛树脂粘结剂的制备方法 |
FR2948307B1 (fr) | 2009-07-24 | 2014-07-25 | Huettenes Albertus France | Procede d'obtention d'un corps forme a partir d'un melange granulaire |
EP2517807B1 (fr) * | 2009-12-25 | 2018-06-20 | Kao Corporation | Composition de liant pour la formation de moules autodurcissants |
JP5684038B2 (ja) | 2011-04-28 | 2015-03-11 | スター精密株式会社 | プリンタ |
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2012
- 2012-09-10 FR FR1258481A patent/FR2995234B1/fr active Active
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2013
- 2013-09-10 EA EA201590537A patent/EA028270B1/ru not_active IP Right Cessation
- 2013-09-10 EP EP13774731.7A patent/EP2892670B1/fr not_active Not-in-force
- 2013-09-10 US US14/426,930 patent/US10137494B2/en not_active Expired - Fee Related
- 2013-09-10 MX MX2015003016A patent/MX347364B/es active IP Right Grant
- 2013-09-10 BR BR112015004908-7A patent/BR112015004908B1/pt not_active IP Right Cessation
- 2013-09-10 CN CN201380047109.4A patent/CN104619437B/zh not_active Expired - Fee Related
- 2013-09-10 PL PL13774731T patent/PL2892670T3/pl unknown
- 2013-09-10 WO PCT/FR2013/052077 patent/WO2014037681A2/fr active Application Filing
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Also Published As
Publication number | Publication date |
---|---|
EA028270B1 (ru) | 2017-10-31 |
BR112015004908A2 (pt) | 2017-07-04 |
US20150217365A1 (en) | 2015-08-06 |
BR112015004908B1 (pt) | 2019-05-14 |
WO2014037681A2 (fr) | 2014-03-13 |
MX347364B (es) | 2017-04-25 |
PL2892670T3 (pl) | 2017-04-28 |
FR2995234B1 (fr) | 2014-12-19 |
EA201590537A1 (ru) | 2015-06-30 |
CN104619437A (zh) | 2015-05-13 |
CN104619437B (zh) | 2017-03-08 |
FR2995234A1 (fr) | 2014-03-14 |
US10137494B2 (en) | 2018-11-27 |
WO2014037681A3 (fr) | 2014-11-13 |
EP2892670B1 (fr) | 2016-09-07 |
MX2015003016A (es) | 2015-11-06 |
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