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WO2014059969A2 - Mélanges de matière à mouler à base de liant inorganique et procédé de production de moules et de noyaux pour la coulée de métaux - Google Patents

Mélanges de matière à mouler à base de liant inorganique et procédé de production de moules et de noyaux pour la coulée de métaux Download PDF

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Publication number
WO2014059969A2
WO2014059969A2 PCT/DE2013/000612 DE2013000612W WO2014059969A2 WO 2014059969 A2 WO2014059969 A2 WO 2014059969A2 DE 2013000612 W DE2013000612 W DE 2013000612W WO 2014059969 A2 WO2014059969 A2 WO 2014059969A2
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Prior art keywords
molding material
material mixture
weight
phosphate
mixture according
Prior art date
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Ceased
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PCT/DE2013/000612
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German (de)
English (en)
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WO2014059969A3 (fr
Inventor
Dennis BARTELS
Heinz DETERS
Antoni Gieniec
Diether Koch
Hannes LINCKE
Martin Oberleiter
Oliver Schmidt
Carolin WALLENHORST
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ASK Chemicals GmbH
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ASK Chemicals GmbH
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Publication of WO2014059969A3 publication Critical patent/WO2014059969A3/fr
Anticipated expiration legal-status Critical
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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
    • B22C1/18—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 inorganic agents
    • B22C1/181—Cements, oxides or clays
    • 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
    • B22C1/18—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 inorganic agents
    • B22C1/186—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 inorganic agents contaming ammonium or metal silicates, silica sols

Definitions

  • the invention relates to molding compositions based on inorganic binders for the production of molds and cores for metal casting consisting of at least one refractory molding material, an inorganic binder and particulate amorphous silica as an additive. Furthermore, the invention relates to a process for the production of molds and cores using the molding material mixtures.
  • Casting molds are essentially composed of molds and molds and cores which represent the negative molds of the casting to be produced. These cores and forms consist of a refractory material, such as quartz sand, and a suitable binder, which gives the mold after removal from the mold sufficient mechanical strength.
  • the refractory molding base material is preferably in a free-flowing form, so that it can be filled into a suitable mold and compacted there.
  • the binder produces a firm cohesion between the particles of the molding base material, so that the casting mold obtains the required mechanical stability. Molds form the outer wall of the casting during casting, cores are used to form cavities within the casting. It is not absolutely necessary that the forms and cores are made of the same material.
  • the external shape of the castings with the help of permanent metal molds done with chill casting.
  • a combination of molds and cores made from differently blended molding compounds and by different processes. If, in simplification, only forms are mentioned below, the statements apply to the same extent to cores based on the same molding material mixture and produced by the same process.
  • both organic and inorganic binders can be used, the curing of which can be effected in each case by cold or hot processes.
  • Cold processes are those processes which are carried out essentially without heating the mold used for core production, generally at room temperature or at a temperature caused by a possible reaction.
  • the curing takes place, for example, in that a gas is passed through the molding mixture to be cured and thereby initiates a chemical reaction.
  • a gas is passed through the molding mixture to be cured and thereby initiates a chemical reaction.
  • the molding material mixture is heated to a sufficiently high temperature after molding, for example by the heated mold, to expel the solvent contained in the binder and / or to initiate a chemical reaction by which the binder is cured.
  • organic binders Due to their technical properties, organic binders have currently been used in economic terms. the greater importance in the market. Regardless of their composition, however, they have the disadvantage that they decompose during the casting and thereby z. significant amounts of pollutants, e.g. Benzene, toluene and xylenes emit. In addition, the casting of organic binder usually leads to odor and smoke pollution. In some systems, undesirable emissions even occur during core production and / or storage. Although binder emissions have reduced emissions over the years, they can not be completely avoided with organic binders. For this reason, in recent years, the research and development work has again turned to the inorganic binder to further improve these and the product properties of the molds and cores thus produced.
  • pollutants e.g. Benzene, toluene and xylenes emit.
  • the casting of organic binder usually leads to odor and smoke pollution. In some systems, undesirable emissions even occur during core production and / or storage.
  • binder emissions have reduced emissions over the years
  • Inorganic binders have been known for a long time, especially those based on water glasses. They were widely used in the 1950s and 60s, but with the advent of modern organic binders, they quickly lost their importance. There are three different methods of curing the water glasses:
  • C0 2 curing eg in a hot box process or by microwave treatment.
  • C0 2 curing is described, for example, in GB 634817, hardening by means of hot air without C0 2 addition, for example in H. Polzin, W. Tilch and T. Kooyers, Foundry Practice 6/2006, p. 171.
  • a further development of C0 2 -curing by a subsequent flushing with air is disclosed in DE 102012103705.1.
  • the ester cure is e.g. from GB 1029057 known (so-called no-bake method).
  • the object of the present invention is to further improve the properties of inorganic binders, in order to make them even more universally applicable and to make them an even better alternative to the currently dominant organic binders.
  • the particulate amorphous Si0 2 prepared by the above method is also characterized by the term "artificially produced (particulate) amorphous S1O2.”
  • the particulate S1O2 can also be described cumulatively or alternatively to the preparation by the following parameters.
  • the molding material mixture according to the invention comprises at least:
  • an inorganic binder preferably based on water glass, phosphate or a mixture of both,
  • a molding material i.A.
  • the procedure is such that the refractory molding base material is initially charged and then the binder and the additive are added together or successively with stirring.
  • the binder is charged before the additive. It is stirred until a uniform distribution of the binder and the additive is ensured in the molding material.
  • the molding material mixture is then brought into the desired shape.
  • customary methods are used for the shaping.
  • the molding material mixture can be shot by means of a core shooting machine with the aid of compressed air into the mold.
  • Another possibility is to let the molding material mixture free-flowing trickle from the mixer in the mold tool and compress them there by shaking, stamping or pressing.
  • the hardening of the molding material mixture takes place according to an embodiment of the invention after the hot-box process, ie it is hardened with the aid of hot tools.
  • the hot tools preferably have a temperature of 100 to 300 ° C, more preferably of 120 ° C to 250 ° C.
  • a gas eg CO 2 or CO 2 enriched air
  • the above process (hot-box process) is preferably carried out in a core shooter.
  • the curing can also take place in that CO 2 , a CO 2 / gas mixture (eg with air) or CO 2 and a gas / gas mixture (eg air) successively (as described in detail in DE 102012103705.1) by the cold mold
  • the term "cold” means temperatures below 100 ° C., preferably below 50 ° C. and in particular at room temperature (eg 23 ° C.)
  • Guided gas or gas mixture may preferably be slightly heated, ie, up to a temperature of 120 ° C, preferably up to 100 ° C, particularly preferably up to 80 ° C.
  • molding base material materials customary for the production of casting molds can be used. Suitable examples are quartz, zircon or chrome ore sand, olivine, vermiculite, bauxite and chamotte. It is not necessary to use only new sands. In terms of resource conservation and to avoid landfill costs, it is even advantageous to have the highest possible proportion of regenerated
  • regenerates which are obtained by washing and subsequent drying. It is also possible to use regenerates obtained by purely mechanical treatment. In general, the regenerates can make up at least about 70% by weight of the molding base material, preferably at least about 80% by weight and more preferably at least about 90% by weight.
  • the average diameter of the molding materials is usually between 100 ⁇ and 600 ⁇ , preferably between 120 ⁇ and 550 ⁇ and more preferably between 150 ⁇ and 500 ⁇ .
  • the particle size can be determined, for example, by sieving according to DIN ISO 3310.
  • artificial molding materials can also be used as mold base materials, in particular as an additive to the above molding base materials but also as an exclusive molding base material, such as Glass beads, glass granules, the known under the name “Cerabeads” or “Carboaccucast” spherical ceramic mold base materials or Aluminiumilmilikmikrohohlkugeln (so-called.
  • Such aluminum silicate microbubbles are marketed, for example, by Omega Minerals Germany GmbH, Norderstedt, under the name “Omega-Spheres.” Corresponding products are also available from PQ Corporation (USA) under the name “Extendospheres”.
  • the preferred proportion of the artificial molding base materials is at least about 3 wt.%, Particularly preferably at least about 5 wt.%, Particularly preferably at least about 10 wt.%, Preferably at least about 15 wt.%, Particularly preferably at least about 20% by weight, in each case based on the total amount of the refractory molding base material.
  • the molding material mixture of the invention comprises an inorganic binder, for example based on water glass.
  • water glasses can be used as the water glass, as they have hitherto been used as binders in molding material mixtures.
  • These water glasses contain dissolved alkali silicates and can be prepared by dissolving glassy lithium, sodium and potassium silicates in water.
  • the water glasses preferably have a molar modulus Si0 2 / M 2 O in the range from 1.6 to 4.0, in particular from 2.0 to less than 3.5, where M is lithium, sodium or potassium.
  • the water glasses have a solids content in the range of 25 to 65 wt.%, Preferably from 30 to 60 wt.%.
  • the solids content refers to the amount of Si0 2 and M 2 0 contained in the water glass.
  • the water glass-based binder between 0.5% by weight and 5% by weight of the water glass-based binder are used, preferably between 0.75% by weight and 4% by weight, particularly preferably between 1% by weight and 3, 5 wt.%, Each based on the molding material.
  • The% by weight refers to water glasses with a solids content as indicated above, i. includes the diluent.
  • water glass binders instead of water glass binders, it is also possible to use those based on water-soluble phosphate glasses and / or borates, as described, for example, in US Pat. in US 5,641,015.
  • the preferred phosphate glasses have a solubility in water of at least 200 g / L, preferably at least 800 g / L and contain between 30 and 80 mol% P 2 0 5 , between 20 and 70 mol% Li 2 0, Na 2 0 or K 2 0, between 0 and 30 mol% CaO, MgO or ZnO and between 0 and 15 mol% Al 2 0 3 , Fe 2 0 3 or B 2 0 3 .
  • the particularly preferred composition is 58 to 72% by weight of P 2 O 5 , 28 to 42% by weight of Na 2 O and 0 to 16% by weight of CaO.
  • the phosphate anions are preferably present in the phosphate glasses as chains.
  • the phosphate glasses are usually used as about 15 to 65% strength by weight, preferably as about 25 to 60% strength by weight aqueous solutions. However, it is also possible to add the phosphate glass and the water separately to the molding base material, with at least part of the phosphate glass dissolving in the water during the preparation of the molding material mixture.
  • Typical addition amounts of the phosphate glass solutions are from 0.5% by weight to 15% by weight, preferably from 0.75% by weight to 12% by weight, more preferably from 1% by weight to 10% by weight, based in each case on the molding base material ,
  • the term refers to phosphate glass solutions having a solids content as indicated above, i. includes the diluent.
  • the molding material mixtures preferably further contain hardeners which bring about the solidification of the mixtures without the need for heat supply or for a gas to be passed through the mixture.
  • hardeners may be liquid or solid, organic or inorganic in nature.
  • Suitable organic hardeners are e.g. Esters of carbonic acid such as propylene carbonate, esters of monocarboxylic acids having 1 to 8 carbon atoms with mono-, di- or trifunctional alcohols such as ethylene glycol diacetate, glycerol mono-, di- and - triacetic acid esters, and cyclic esters of hydroxycarboxylic acids such as ⁇ - butyrolactone.
  • the esters can also be mixed with one another.
  • Suitable inorganic hardeners for waterglass-based binders are e.g. Phosphates such as Lithopix P26 (an aluminum phosphate of Fa.
  • the ratio of hardener to binder can vary depending on the desired property, eg processing time and / or breaking time of the molding material mixtures.
  • the proportion of hardener is greater than or equal to 5% by weight, preferably greater than or equal to 8% by weight, particularly preferably greater than or equal to 0% by weight, in each case based on the binder.
  • the upper limits are less than or equal to 25% by weight, based on the binder, preferably less than or equal to 20% by weight, more preferably less than or equal to 15% by weight.
  • the molding material mixtures contain a proportion of above artificially produced particulate amorphous SiO 2, which was prepared by melting and cooling of crystalline quartz. Corresponding products are marketed, for example, by Denkikagaku Kougyo KK.
  • the inventors assume that the improved flowability is due to the fact that the particulate amorphous SiO 2 used according to the invention is less prone to agglomeration than the amorphous SiO 2 from the other production processes and therefore already without the action of strong shear forces more primary particles are present. It can be seen that there are more isolated particles in the SiO 2 according to the invention than in the case of an amorphous non-inventive SiO 2 produced in the production of silicon / ferrosilicon. There, one recognizes a stronger adhesion of individual spheres into larger associations, which can no longer be broken up into the primary particles. The particle size was determined by means of dynamic light scattering on a
  • Horiba LA 950 determines the scanning electron micrographs using a Nova NanoSem 230 ultrahigh-resolution scanning electron microscope from FEI equipped with a Through The Lens Detector (TLD). For the SEM measurements, the samples were dispersed in distilled water and then applied to a copper tape-covered aluminum holder before the water was evaporated. In this way, details of the
  • the amorphous S1O2 produced by melting and rapid cooling is also available in a very pure form.
  • the SiO 2 content can be more than 99.5% by weight, the amorphous fraction usually making up more than 90% by weight, preferably more than 93% by weight and particularly preferably more than 95% by weight.
  • the water content of the particulate amorphous SiO 2 used according to the invention is less than 10% by weight, preferably less than 5% by weight, and more preferably less than 2% by weight.
  • the particulate amorphous SiO 2 is used as a dry powder. The powder is trickling and free-flowing under its own weight.
  • the average particle size of the particulate amorphous S1O2 preferably moves between 0.05 ⁇ m and 10 ⁇ m, in particular between 0.1 ⁇ m and 5 ⁇ m, and particularly preferably between 0.1 ⁇ m and 2 ⁇ m, whereby primary particles with diameters between approx 0.01 ⁇ and about 5 ⁇ were found.
  • the determination was carried out with the aid of dynamic light scattering on a Horiba LA 950.
  • the particulate amorphous silica preferably has an average particle size of preferably less than 300 ⁇ , preferably less than 200 ⁇ , more preferably less than 100 ⁇ .
  • the particle size can be determined by sieve analysis.
  • the sieve residue of the particulate amorphous SiO 2 in a passage through a sieve with 125 ⁇ m mesh size (120 mesh) is preferably not more than 10% by weight, more preferably not more than 5% by weight and most preferably not more than 2% by weight. %.
  • the sieve residue is determined according to the machine screen method described in DIN 66165 (Part 2), wherein additionally a chain ring is used as screen aid.
  • the residue of particulate amorphous SiO 2 used according to the invention when passing through a sieve having a mesh size of 45 ⁇ m (325 mesh), does not exceed about 10% by weight, particularly preferably not more than approx 5% by weight and most preferably not more than about 2% by weight (sieving according to DIN ISO 3310).
  • the ratio of the primary particles to the secondary particles of the artificially produced particulate amorphous SiO 2 is advantageously and independently characterized as follows: a) The particles are more than 20%, preferably more than 40%, more preferably more than 60% and very particularly preferably more than 80%, based on the total number of particles, in the form of essentially spherical primary particles, in each case in particular with the above limit values in the form of spherical primary particles with diameters of less than 4 ⁇ m, and particularly preferably less than 2 ⁇ m.
  • the particles are more than 20% by volume, preferably more than 40% by volume, more preferably more than 60% by volume and most preferably more than 80% by volume, based on the cumulative volume of the particles, in the form of substantially spherical primary particles, in each case in particular with the above limit values in the form of spherical primary particles with diameters of less than 4 gm, and particularly preferably less than 2 [im.
  • the calculation of the respective volumes of the individual particles as well as the cumulative volume of all particles was carried out under the assumption of a spherical symmetry present in each case for individual particles and with the aid of the diameter determined for each particle by means of SEM images.
  • the particles are more than 20 area%, preferably more than 40 area 0 /), more preferably more than 60 area% and most preferably more than 80 area%, based on the cumulative area of the particles, in Form of substantially spherical primary particles before, in each case in particular with the above limits in the form of spherical primary particles with diameters smaller than 4 ⁇ , and more preferably less than 2 gm.
  • the percentage detection is based on a statistical analysis of a variety of SEM images, agglomeration / adhesion / fusion is / are classified as such only if the respective contours of individual adjacent spherical (one inside the other) primary particles are no longer recognizable. In the case of superimposed particles, in which the respective contours of the spherical geometries (otherwise) can be seen, the classification is done as a primary particle, even if the view does not allow an actual classification due to the two-dimensionality of the images. When determining the area, only the visible particle areas are evaluated and contribute to the total.
  • Suitable particulate amorphous SiO 2 used according to the invention has a BET of less than or equal to 35 m 2 / g, preferably less than or equal to 20 m 2 / g, particularly preferably less than or equal to 17 m 2 / g and particularly preferably less than or equal to 15 m 2 / g.
  • the lower limits are greater than or equal to 1 m 2 / g, preferably greater than or equal to 2 m 2 / g, particularly preferably greater than or equal to 3 m 2 / g and particularly preferably greater than or equal to 4 m 2 / g.
  • the products may also be mixed, e.g. to selectively mixtures with certain compositions, average particle sizes and / or specific see surfaces.
  • between 0.1% by weight and 2% by weight of the artificially produced particulate amorphous SiO 2 are used, preferably between 0.1% by weight and 1.8% by weight and more preferably between 0.1% by weight ,% and 1, 5 wt.%, Each based on the molding material.
  • the ratio of inorganic binder to particulate amorphous SiO 2 used according to the invention can be varied within wide limits. This offers the possibility of greatly varying the initial strengths of the cores, ie the strength immediately after removal from the mold, without significantly affecting the ultimate strengths. This is of great interest especially in light metal casting. On the one hand, high initial strengths are desired in order to be able to easily transport the cores after their production or to assemble them into complete core packages, on the other hand, the final strengths should not be too high to avoid difficulties in core decay after casting.
  • the artificially produced particulate amorphous S1O2 is preferably present in a proportion of from 2% to 60% by weight, more preferably from 3% to 55% by weight and most preferably from 4% by weight to 50% by weight.
  • the artificially produced particulate amorphous SiO 2 corresponds to the particulate amorphous SiO 2 according to the terminology of the claims and is used in particular as a powder, in particular with a water content of less than 5 wt.%, Preferably less than 3 wt.%, In particular less than 2 wt.%, (Water content determined by Karl Fischer).
  • the ignition loss (at 400 ° C.) is preferably less than 6, less than 5 or even less than 4% by weight.
  • the addition of the particulate amorphous Si0 2 used according to the invention can be carried out both before and after or mixed together with the binder addition directly to the refractory material.
  • the particulate amorphous S1O2 used according to the invention is added to the refractory dry and in powder form directly after the binder addition.
  • a premix of Si0 2 is first prepared with an aqueous alkali solution, such as sodium hydroxide, and optionally the binder or a part of the binder and then added to the refractory molding material.
  • aqueous alkali solution such as sodium hydroxide
  • the binder or binder fraction which may still be present and which is not used for the premix can be added to the molding base material before or after the addition of the premix or together with it.
  • a non-inventive synthetic amorphous S1O2 according to EP 1802409 B1 e.g. in the ratio of 1 to less than 1 are used.
  • inventive and non-inventive S1O2 can be advantageous if the effect of the particulate amorphous SiO 2 used according to the invention is to be "weakened.”
  • Additions of inventive and non-inventive amorphous SiO 2 to the molding material mixture allow the strengths and / or
  • the molding material mixture according to the invention may comprise a phosphorus-containing compound in a further embodiment, such an additive being preferred for very thin-walled sections of a casting mold and in particular for cores
  • the thermal stability of the cores or of the thin-walled section of the casting mold can be increased, which is particularly important when the liquid metal encounters an inclined surface during casting and there due to the high metallostati pressure exerts a strong erosive effect or can lead to deformations in particular thin-walled sections of the mold.
  • Suitable phosphorus compounds do not or not significantly affect the processing time of the novel molding material mixtures.
  • An example of this is sodium hexametaphosphate. Further suitable representatives as well as their added amounts are described in detail in WO 2008/046653 and this is to that extent also made a disclosure of the present property rights.
  • the molding material mixture according to the invention contains a proportion of platelet-shaped lubricants, in particular graphite or MoS 2 .
  • the amount of added platelet-shaped lubricant, in particular graphite is preferably 0.05 wt.% To 1 wt.% Based on the molding material.
  • the platelet-shaped lubricant it is also possible to use surface-active substances, in particular surfactants, which likewise further improve the flowability of the molding material mixture according to the invention.
  • the molding material mixture according to the invention may also comprise further additives.
  • release agents can be added which facilitate the detachment of the cores from the mold.
  • Suitable release agents are, for example, calcium stearate, fatty acid esters, waxes, natural resins or special alkyd resins. If these release agents are soluble in the binder and do not separate from it even after prolonged storage, especially at low temperatures, they may already be present in the binder component, but they may also form part of the additive or as a separate component of the molding material mixture be added.
  • organic additives may be added. Suitable organic additives are for example phenol-formaldehyde resins such as novolacs, epoxy resins such as
  • Bisphenol A epoxy resins bisphenol F epoxy resins or epoxidized novolacs
  • polyols such as polyethylene or polypropylene glycols, glycerol or polyglycerol, polyolefins such as polyethylene or polypropylene, copolymers of olefins such as ethylene and / or propylene with others
  • Comonomers such as vinyl acetate or styrene and / or diene monomers such as butadiene, polyamides such as polyamide-6, polyamide-12 or polyamide-6,6, natural resins such as gum rosin, fatty acid esters such as cetyl palmitate, fatty acid amides such as
  • Ethylenediaminebisstearamide metal soaps such as stearates or oleates of divalent or trivalent metals and carbohydrates such as dextrins.
  • Carbohydrates, especially dextrins are particularly suitable.
  • Suitable carbohydrates are described in WO 2008/046651 A1.
  • the organic additives can be used both as a pure substance, as well as in admixture with various other organic and / or inorganic compounds.
  • the organic additives are preferably used in an amount of from 0.01% by weight to 1.5% by weight, more preferably from 0.05% by weight to 1.3% by weight and most preferably from 0.1% by weight to 1 % By weight added, in each case based on the molding material.
  • the molding material mixture according to the invention therefore contains a proportion of at least one silane.
  • Suitable silanes are, for example, aminosilanes, epoxysilanes, mercaptosilanes,
  • Suitable silanes are ⁇ -(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N
  • the silanes mentioned, in particular the aminosilanes can also
  • silane based on the binder
  • a suitable additives are alkali metal siliconates, for example potassium methyl siliconate, of which about 0.5% by weight to about 15% by weight, preferably about 1% by weight to about 10% by weight and particularly preferably about 1% by weight. can be used up to about 5 wt.% Based on the binder.
  • the molding material mixture comprises an organic additive
  • it can be added per se at any point in time during the preparation of the molding material mixture.
  • the addition may take place in bulk or else in the form of a solution.
  • Water-soluble organic additives can be used in the form of an aqueous solution. If the organic additives are soluble in the binder and are stable in storage for several months without decomposition, they can also be dissolved in the binder and thus added together with the molding material.
  • Water-insoluble additives may be used in the form of a dispersion or a paste.
  • the dispersions or pastes preferably contain water as the liquid medium.
  • the molding material mixture contains silanes and / or alkali metal siliconates, they are usually added in the form that they are incorporated into the binder in advance. However, they can also be added to the molding material as a separate component.
  • Inorganic additives can also have a positive influence on the properties of the molding material mixtures according to the invention.
  • Alkali borates as components of waterglass binders are described e.g. in EP 011 1398.
  • Suitable inorganic additives for improving the casting surface on the basis of BaSO 4 are described in DE 102012104934.3 and can
  • Formstoffmischung be added as a complete or at least partial replacement of the above-mentioned organic additives. Further details such as the respective amounts added are described in detail in DE 102012104934.3 and this is also made to the extent of disclosure of the present property rights.
  • the cores produced from these molding material mixtures show good disintegration after the casting, in particular in aluminum casting.
  • the use of the cores produced from the molding mixtures according to the invention is not limited to light metal casting.
  • the molds are generally suitable for casting metals. Such metals include, for example, non-ferrous metals such as brass or bronze, and ferrous metals.
  • Hot curing 1.1. Strengths and core weights depending on the type of added artificially produced particulate amorphous S1O2
  • Quartz sand was poured into the bowl of a mixer from Hobart (model HSM 10). With stirring, the binder was then added and each intensively mixed with the sand for 1 minute.
  • the sand used, the type of binder and the respective amounts added are listed in Table 1.
  • test bars were placed in a Georg Fischer Strength Tester equipped with a 3-point bender, and the force was measured which resulted in breakage of the test bars.
  • the flexural strengths were determined according to the following scheme:
  • the cores produced with an inorganic binder and the SiO 2 according to the invention have higher strengths and higher core weights than the cores which contain the SiO 2 not according to the invention.

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Abstract

La présente invention concerne des mélanges de matière à mouler à base de liant inorganique permettant de produire des moules et des noyaux pour la coulée de métaux, lesquels mélanges sont composés d'au moins une matière de base à mouler réfractaire, d'un liant inorganique et de dioxyde de silicium amorphe particulaire en tant qu'additif. L'invention concerne également un procédé de production de moules et de noyaux mettant en oeuvre lesdits mélanges de matière à mouler.
PCT/DE2013/000612 2012-10-19 2013-10-18 Mélanges de matière à mouler à base de liant inorganique et procédé de production de moules et de noyaux pour la coulée de métaux Ceased WO2014059969A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012020511.2A DE102012020511A1 (de) 2012-10-19 2012-10-19 Formstoffmischungen auf der Basis anorganischer Bindemittel und Verfahren zur Herstellung von Formen und Kerne für den Metallguss
DE102012020511.2 2012-10-19

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WO2014059969A2 true WO2014059969A2 (fr) 2014-04-24
WO2014059969A3 WO2014059969A3 (fr) 2014-07-10

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US10981215B2 (en) 2017-06-30 2021-04-20 HÜTTENES-ALBERTUS Chemische Werke Gesellschaft mit beschränkter Haftung Method for producing a moulding material mixture and a moulded body thereof in the casting industry and kit for use in this method
CN112703071A (zh) * 2018-09-07 2021-04-23 胡坦斯·阿尔伯图斯化学厂有限公司 制备用于制造铸造模具和型芯的粒状耐火组合物的方法、相应的用途以及用于热处理的再生混合物
CN113825575A (zh) * 2019-05-16 2021-12-21 胡坦斯·阿尔伯图斯化学厂有限公司 包括微粒状合成非晶二氧化硅作为用于模制材料混合物的添加剂的粒子材料的应用、相应的方法、混合物和试剂盒
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CN119566216A (zh) * 2024-11-19 2025-03-07 沈阳工业大学 无机粘结剂砂硬化工艺方法及应用

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US10259035B2 (en) 2012-12-22 2019-04-16 Ask Chemicals Gmbh Molding material mixtures containing aluminum/silicon oxides in particulate form
US10294161B2 (en) 2012-12-22 2019-05-21 Ask Chemicals Gmbh Molding material mixtures containing metal oxides of aluminum and zirconium in particulate form
US9901975B2 (en) 2013-10-22 2018-02-27 Ask Chemicals Gmbh Molding material mixtures containing an oxidic boron compound and method for the production of molds and cores
WO2015058737A3 (fr) * 2013-10-22 2015-06-18 Ask Chemicals Gmbh Mélanges de matières moulables contenant un composé oxydé du bore et procédé de fabrication de moules et de noyaux
US11305335B2 (en) 2016-02-05 2022-04-19 Jinan Shengquan Group Share-Holdings Co., Ltd Curing agent for water glass molding and manufacturing method and use thereof
CN105665615A (zh) * 2016-02-05 2016-06-15 济南圣泉集团股份有限公司 一种铸造水玻璃用固化剂及其制备方法和用途
US10981215B2 (en) 2017-06-30 2021-04-20 HÜTTENES-ALBERTUS Chemische Werke Gesellschaft mit beschränkter Haftung Method for producing a moulding material mixture and a moulded body thereof in the casting industry and kit for use in this method
US11311931B2 (en) 2018-09-07 2022-04-26 HÜTTENES-ALBERTUS Chemische Werke Gesellschaft mit beschränkter Haftung Method of preparing a particulate refractory composition for use in the manufacture of foundry moulds and cores, corresponding uses, and reclamation mixture for thermal treatment
CN112703071A (zh) * 2018-09-07 2021-04-23 胡坦斯·阿尔伯图斯化学厂有限公司 制备用于制造铸造模具和型芯的粒状耐火组合物的方法、相应的用途以及用于热处理的再生混合物
KR20220009987A (ko) * 2019-05-16 2022-01-25 휴테네스 알베르투스 케미쉐 베르케 게엠베하 몰딩 재료 혼합물용 첨가제로서 입자-형상 합성 비정질 이산화 규소를 포함하는 입자상 재료의 용도, 관련 방법, 혼합물, 및 키트
CN113825575A (zh) * 2019-05-16 2021-12-21 胡坦斯·阿尔伯图斯化学厂有限公司 包括微粒状合成非晶二氧化硅作为用于模制材料混合物的添加剂的粒子材料的应用、相应的方法、混合物和试剂盒
JP2022532508A (ja) * 2019-05-16 2022-07-15 ヒュッテネス－アルベルトゥス ヒェーミッシェ ヴェルケ ゲゼルシャフト ミット ベシュレンクテル ハフツング 鋳造材料混合物の添加物としての、粒子状合成非晶質二酸化ケイ素を含む粒子材料の使用、対応する方法、混合物、及びキット
KR102805611B1 (ko) 2019-05-16 2025-05-13 휴테네스 알베르투스 케미쉐 베르케 게젤샤프트 미트 베슈렝크터 하프퉁 몰딩 재료 혼합물용 첨가제로서 입자-형상 합성 비정질 이산화 규소를 포함하는 입자상 재료의 용도, 관련 방법, 혼합물, 및 키트
TWI897863B (zh) * 2019-05-16 2025-09-21 德商哈登斯 雅伯特斯化學威基有限公司 包括微粒狀合成非晶二氧化矽作為用於模製材料混合物之添加劑的粒子材料之應用、自該粒子材料製造模製體的方法、混合物及試劑盒
DE102020118314A1 (de) 2020-07-10 2022-01-13 Ask Chemicals Gmbh Mittel zur Reduzierung von Sandanhaftungen
WO2022008007A1 (fr) 2020-07-10 2022-01-13 Ask Chemicals Gmbh Produit pour réduire les adhérences de sable
US12023726B2 (en) 2020-07-10 2024-07-02 Ask Chemicals Gmbh Product for reducing sand adhesions
CN119566216A (zh) * 2024-11-19 2025-03-07 沈阳工业大学 无机粘结剂砂硬化工艺方法及应用

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