EP1035931B1 - Fluid composition capable of producing shiny carbon during metal casting and preparation method - Google Patents
Fluid composition capable of producing shiny carbon during metal casting and preparation method Download PDFInfo
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- EP1035931B1 EP1035931B1 EP98958311A EP98958311A EP1035931B1 EP 1035931 B1 EP1035931 B1 EP 1035931B1 EP 98958311 A EP98958311 A EP 98958311A EP 98958311 A EP98958311 A EP 98958311A EP 1035931 B1 EP1035931 B1 EP 1035931B1
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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
Definitions
- the present invention relates to the field of foundry, and relates more particularly to a new composition of brilliant carbon generator.
- Glossy carbon generators are carbonaceous substances that are added to molding sand in foundries to release, at the time of casting, hydrocarbon-type volatiles, whose role is to create a reducing atmosphere in the mold enclosure , and form a carbon deposit of graphitic appearance on the surface of the pieces, thus improving their appearance.
- coal powder finely ground
- a brilliant carbon generating capacity of the order of 8 to 10% of its weight.
- Other substances such as tars, bitumens, certain resins, or polymers such as polystyrene, are often used in admixture with coal dust, to increase the brilliant carbon generating capacity.
- Most brilliant carbon generators are used as a finely divided powder, whose grain size is less than 650 microns, with more than 50% less than 150 microns.
- the present invention aims precisely to offer a solution to the problems mentioned above.
- This object is achieved by means of an additive for foundry molding sands which makes it possible to generate brilliant carbon consisting of a fluid composition comprising, within a liquid support, particles of at least one substance, other than coal, capable of producing brilliant carbon during casting of the metal according to claim 1.
- the content of liquid carrier in the fluid composition of the invention is less than 60% by weight of said composition.
- the liquid carrier is water mixed with at least one organic liquid, which may also be chosen from organic liquids derived from the distillation of petroleum or coal or from liquid derivatives extracted from plants. Examples that may be mentioned include aromatic solvents, fatty acids, certain naphthenic or terpenic derivatives and their mixture.
- the liquid carrier is a mixture of water and at least one organic liquid
- the water advantageously represents at least 30% of the weight of the liquid carrier and / or at least 5% by weight of the fluid composition of the invention.
- fluid composition liquids, suspensions or pastes, substantially homogeneous at least during their use.
- Particle content of a substance, other than coal, capable of producing carbon is between about 85 and 5% by weight of the composition.
- Preferably at least 50% by weight of the particles in the composition of the invention have a size of less than about 500 microns.
- All particles of substance known for their ability to produce shiny carbon during the casting of the metal in the mold, used in the prior art in powder form, are used in the context of the present invention. Mention may in particular be made of bitumens, gilsonite, coumarone-indene resins, albores, certain polyolefins or polymers derived therefrom, resinous compounds obtained by the treatment of bis-phenol A production residues, etc. ..
- these particles can also be made of any other potentially interesting material but having disadvantages for application in powder form, in particular because of unfavorable physical characteristics such as, for example, poor grinding ability, high humidity, caking propensity or to granular segregation.
- These materials are often waste from the production of polymers, which are today most often incinerated.
- Particles of substances capable of producing glossy carbon which are preferred according to the invention have a content of low polycyclic aromatic hydrocarbons (benzo-A-pyrene ⁇ 50 ppm) and a sulfur content of less than 3%.
- the fluid composition according to the invention may further comprise an adequate amount of one or more suspending agents, rheology or surface to prevent settling of the particles or separation of liquid phases.
- suspending agents there may be mentioned clays, bentonites, surfactants and polysaccharides.
- the fluid composition of the invention may also comprise one or more additives known for their favorable effects in molding sand, for example to improve fluidity, cohesion or clamping. It may be, for example, saponified oils, fatty acids or their saponified esters or not, glycols, graphite, or additives acting on the activation of bentonite like certain bases.
- the fluid composition according to the invention may also comprise one or more additives known for their antifreeze effect such as ethylenes glycols, or their antibacterial effect such as formalin.
- coal powder of the particle size advantageously less than 600 microns can be incorporated in the fluid composition of the invention.
- the weight content of the coal powder in said composition will preferably be less than 50%.
- the invention also relates to a process for preparing a fluid composition according to the invention consisting in incorporating into the liquid carrier particles of at least one substance, other than coal, capable of producing shiny carbon, either in the form of fine particles whose size is less than 500 microns at 50% of their weight, dry or wet, or by grinding wet with said liquid carrier.
- the liquid carrier and the particles used in this process are in accordance with those previously described in the fluid composition of the invention.
- the invention also relates to the use of particles of a substance, other than coal, capable of producing glossy carbon during the casting of metal in the mold, for the preparation of a fluid composition constituting an additive for foundry casting sand.
- Said particles are of the type defined previously in the fluid composition of the invention.
- the invention further relates to the use of an additive previously defined for the preparation of a foundry molding composition, and to a sand-based foundry molding composition comprising such an additive and a process for its preparation.
- a process for preparing a foundry molding composition comprises mixing with the foundry sand, for example from the after-shake-out, an amount of at least 0.05% by weight of an additive according to any one of the following: Claims 1 to 15, either directly or via a premix with other materials.
- the following example relates to the use tests, as a foundry-shining carbon generator, of granulometric selection fines derived as waste from the manufacture of styrene-di-vinyl-benzene copolymer (S-DVB) for ion exchange resins.
- S-DVB styrene-di-vinyl-benzene copolymer
- the liquid cast iron is then poured into the mold. After cooling, there is a beautiful skin of room without defect and well pickled.
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Abstract
Description
La présente invention concerne le domaine de la fonderie, et se rapporte plus particulièrement à une nouvelle composition de générateur de carbone brillant.The present invention relates to the field of foundry, and relates more particularly to a new composition of brilliant carbon generator.
Les générateurs de carbone brillant sont des substances carbonées qui sont ajoutées au sable de moulage dans les fonderies pour dégager, au moment de la coulée, des matières volatiles de types hydrocarbures, dont le rôle est de créer une atmosphère réductrice dans l'enceinte du moule, et de former un dépôt de carbone d'apparence graphitique sur la surface des pièces, améliorant ainsi leur aspect.Glossy carbon generators are carbonaceous substances that are added to molding sand in foundries to release, at the time of casting, hydrocarbon-type volatiles, whose role is to create a reducing atmosphere in the mold enclosure , and form a carbon deposit of graphitic appearance on the surface of the pieces, thus improving their appearance.
Traditionnellement, la poudre de houille, finement broyée, est la substance la plus utilisée, avec une capacité de génération de carbone brillant de l'ordre de 8 à 10 % de son poids. D'autres substances, telles que les goudrons, les bitumes, certaines résines, ou des polymères tels que le polystyrène, sont utilisées souvent en mélange avec de la poudre de houille, pour augmenter la capacité de génération de carbone brillant.Traditionally, coal powder, finely ground, is the most used substance, with a brilliant carbon generating capacity of the order of 8 to 10% of its weight. Other substances, such as tars, bitumens, certain resins, or polymers such as polystyrene, are often used in admixture with coal dust, to increase the brilliant carbon generating capacity.
La plupart des générateurs de carbone brillant sont utilisés sous forme d'une poudre finement divisée, dont la taille des grains est inférieure à 650 microns, avec plus de 50 % inférieur à 150 microns.Most brilliant carbon generators are used as a finely divided powder, whose grain size is less than 650 microns, with more than 50% less than 150 microns.
Mais ces poudres, organiques par nature, à forte teneur en poudre de houille, sont susceptibles d'auto-échauffement, d'explosion de poussières, de mottage dans les silos.But these powders, organic by nature, high in coal powder, are susceptible to self-heating, dust explosion, caking in silos.
Afin d'éviter ces inconvénients, certains fabricants, dont la Demanderesse, ont cherché à remplacer les poudres par des liquides telles que des huiles bitumineuses. La pratique a montré que ces huiles ne pouvaient être incorporées au sable en quantité suffisante pour satisfaire au besoin de carbone brillant, car le sable devenait trop plastique, et le dégagement de fumées à la coulée était trop important. L'utilisation de ces huiles est donc restée limitée à quelques cas particuliers. D'autres fabriquants ont essayé de commercialiser des suspensions de poudre de houille dans l'eau, mais ce produit s'est avéré trop onéreux, par rapport à la poudre de houille classique.In order to avoid these drawbacks, some manufacturers, including the Applicant, have sought to replace the powders with liquids such as bituminous oils. Practice has shown that these oils can not be incorporated into the sand in sufficient quantity to satisfy the need for shiny carbon, because the sand became too plastic, and the smoke release at casting was too great. The use of these oils has therefore remained limited to a few special cases. Other manufacturers have tried to market coal powder suspensions in the water, but this product proved to be too expensive compared to conventional coal powder.
Le brevet US 3,666,706 résout le probleme de la toxicité de la poudre de houille en la remplaçant par un polymère d'hydrocarbures aromatiques des types polystyrène, polypropylène, polyethylène.US Pat. No. 3,666,706 solves the problem of the toxicity of coal powder by replacing it with an aromatic hydrocarbon polymer of the polystyrene, polypropylene or polyethylene types.
Certains fabriquants ont contourné le problème du stockage des matériaux pulvérulents, en les mélangeant avec de la bentonite, qui est un autre composant habituel du sable de moulage en fonderie. Ces mélanges, qui ont conquis une part importante du marché européen, présentent un rapport générateurs de carbone brillant / Bentonite compris entre 5 et 0,2.Some manufacturers have circumvented the problem of storing powdery materials by mixing them with bentonite, which is another common component of foundry casting sand. These mixtures, which have conquered a large part of the European market, have a brilliant carbon / Bentonite ratio between 5 and 0.2.
Mais l'influence favorable de tels mélanges sur les problèmes de sécurité au stockage ne devient perceptible que pour des teneurs en bentonite élevées et ces problèmes de sécurité ne sont pas vraiment réglés. Par ailleurs, ces mélanges sont moins souples à utiliser en fonderie car le ratio générateurs de carbone brillant / Bentonite est prédéfini, ce qui oblige souvent les fonderies à maintenir un petit stock de générateurs de carbone brillant séparé.But the favorable influence of such mixtures on storage safety problems becomes noticeable only for high bentonite contents and these safety problems are not really solved. In addition, these blends are less flexible to use in foundries because the ratio of brilliant carbon generators / Bentonite is predefined, which often forces the foundries to maintain a small stock of brilliant carbon generators separated.
Les problèmes de toxicité des hydrocarbures aromatiques polycycliques générés par les générateurs de carbone brillant comme de la houille, justifie la recherche de nouveaux produits de remplacement ou d'enrichissement, dont le choix est toutefois restreint du fait des critères sévères concernant le stockage de matière pulvérulente.The problems of toxicity of polycyclic aromatic hydrocarbons generated by carbon generators bright as coal, justifies the search for new substitutes or enrichment, the choice of which is however limited because of the strict criteria concerning the storage of pulverulent material.
La présente invention vise précisément à offrir une solution aux problèmes énoncés ci-dessus. Ce but est atteint grâce à un additif pour les sables de moulage en fonderie permettant de générer du carbone brillant consistant en une composition fluide comprenant au sein d'un support liquide des particules d'au moins une substance, autre que la houille, capable de produire du carbone brillant au cours de la coulée du métal selon la revendication 1.The present invention aims precisely to offer a solution to the problems mentioned above. This object is achieved by means of an additive for foundry molding sands which makes it possible to generate brilliant carbon consisting of a fluid composition comprising, within a liquid support, particles of at least one substance, other than coal, capable of producing brilliant carbon during casting of the metal according to claim 1.
La teneur en support liquide dans la composition fluide de l'invention est inférieure à 60% en poids de ladite composition. Le support liquide est de l'eau mélangé avec au moins un liquide organique, qui peut être également choisi parmi les liquides organiques provenant de la distillation du pétrole ou de la houille ou encore des dérivés liquides extraits de végétaux. On peut citer comme exemple, les solvants aromatiques, les acides gras, certains dérivés naphténiques ou terpéniques, ainsi que leur mélange. Dans les compositions de l'invention où le support liquide est un mélange d'eau et d'au moins un liquide organique, l'eau représente avantageusement au moins 30 % du poids du support liquide et/ou au moins 5 % en poids de la composition fluide de l'invention.The content of liquid carrier in the fluid composition of the invention is less than 60% by weight of said composition. The liquid carrier is water mixed with at least one organic liquid, which may also be chosen from organic liquids derived from the distillation of petroleum or coal or from liquid derivatives extracted from plants. Examples that may be mentioned include aromatic solvents, fatty acids, certain naphthenic or terpenic derivatives and their mixture. In the compositions of the invention in which the liquid carrier is a mixture of water and at least one organic liquid, the water advantageously represents at least 30% of the weight of the liquid carrier and / or at least 5% by weight of the fluid composition of the invention.
Par composition fluide, on entend aussi bien des liquides, que des suspensions ou des pâtes, sensiblement homogènes au moins lors de leur emploi.By fluid composition is meant liquids, suspensions or pastes, substantially homogeneous at least during their use.
La teneur en particules d'une substance, autre que la houille, capable de produire du carbone brillant dans la composition fluide de l'invention est comprise entre environ 85 et 5 % en poids de la composition. De préférence au moins 50 % en poids des particules dans la composition de l'invention présentent une taille inférieure à environ 500 microns.Particle content of a substance, other than coal, capable of producing carbon The gloss in the fluid composition of the invention is between about 85 and 5% by weight of the composition. Preferably at least 50% by weight of the particles in the composition of the invention have a size of less than about 500 microns.
Toutes particules de substance connue pour leur capacité à produire du carbone brillant au cours de la coulée du métal dans le moule, utilisée dans l'art antérieur sous forme pulvérulente, sont utilisables dans le cadre de la présente invention. On peut citer notamment les bitumes, la gilsonite, les résines coumarone-indène, l'albores, certaines polyoléfines ou les polymères qui en sont dérivés, les composés résineux obtenus par le traitement des résidus de fabrication du bis-phénol A, etc....All particles of substance known for their ability to produce shiny carbon during the casting of the metal in the mold, used in the prior art in powder form, are used in the context of the present invention. Mention may in particular be made of bitumens, gilsonite, coumarone-indene resins, albores, certain polyolefins or polymers derived therefrom, resinous compounds obtained by the treatment of bis-phenol A production residues, etc. ..
Mais ces particules peuvent aussi être constituées de tout autre matière potentiellement intéressante mais présentant des inconvénients pour une application sous forme pulvérulente, notamment en raison de caractéristiques physiques défavorables comme par exemple une mauvaise aptitude à être broyés, une humidité élevée, une propension au mottage ou à la ségrégation granulaire. Ces matières sont souvent des déchets issus de la production de polymères, lesquelles sont aujourd'hui le plus souvent incinérées. A titre d'exemples de telles matières ont peut citer les résidus de la fabrication en émulsion ou en suspension de polyoléfines ou de leurs copolymères, résidus souvent constitués de boues ou de fines humides, ou encore les résidus de la sélection granulométrique de résines échangeuses d'ions.But these particles can also be made of any other potentially interesting material but having disadvantages for application in powder form, in particular because of unfavorable physical characteristics such as, for example, poor grinding ability, high humidity, caking propensity or to granular segregation. These materials are often waste from the production of polymers, which are today most often incinerated. By way of examples of such materials, mention may be made of the residues of the emulsion or suspension manufacture of polyolefins or of their copolymers, residues that often consist of sludge or wet fines, or the residues of the granulometric selection of resins exchange resins. ion.
L'invention concerne donc de façon générale l'utilisation au sein d'un support liquide de particules de composés résineux et plus particulièrement de particules de polymère ou copolymère ou leur mélange dont les chaînes macromoléculaires comportent à raison de 80 % au moins de leur poids, des atomes de carbone et d'hydrogène. Parmi ceux-ci, l'invention envisage préférentiellement ceux dont :
- La capacité de générer du carbone brillant est d'au moins 15 % en poids de leur poids, mesurée selon la méthode définie par l'industrie Allemande de la fonderie dans Bestimmung von glanzkohlenstoff - V. D. G. p. 85, October 1980.
- La teneur en matières volatiles est d'au moins 50 % mesurée selon la méthode ISO 562-1981 et lesdites matières volatiles se dégagent à 80 % au moins, entre 200°C et 500°C.
- The ability to generate brilliant carbon is at least 15% by weight of their weight, measured according to the method defined by the German foundry industry in Bestimmung von glanzkohlenstoff - VDG p. 85, October 1980.
- The volatile matter content is at least 50% measured according to the method ISO 562-1981 and said volatiles are at least 80% clear at between 200 ° C and 500 ° C.
Des particules de substances capables de produire du carbone brillant préférées selon l'invention ont une teneur en hydrocarbures aromatiques polycycliques faible (benzo-A-pyrène < 50ppm) et une teneur en souffre inférieure à 3 %.Particles of substances capable of producing glossy carbon which are preferred according to the invention have a content of low polycyclic aromatic hydrocarbons (benzo-A-pyrene <50 ppm) and a sulfur content of less than 3%.
La composition fluide selon l'invention peut en outre comporter une quantité adéquate d'un ou plusieurs agents de tenue en suspension, de rhéologie ou de surface pour éviter la décantation des particules ou la séparation de phases liquides. Parmi ceux-ci, on peut citer les argiles, les bentones, les tensio-actifs et les polysaccharides.The fluid composition according to the invention may further comprise an adequate amount of one or more suspending agents, rheology or surface to prevent settling of the particles or separation of liquid phases. Among these, there may be mentioned clays, bentonites, surfactants and polysaccharides.
La composition fluide de l'invention peut également comprendre un ou plusieurs additifs connus pour leurs effets favorables dans le sable de moulage, pour en améliorer par exemple la fluidité, la cohésion ou le serrage. Il peut s'agir par exemple d'huiles saponifiées, d'acides gras ou de leurs esters saponifiés ou non, de glycols, de graphite, ou d'additifs agissant sur l'activation de la bentonite comme certaines bases.The fluid composition of the invention may also comprise one or more additives known for their favorable effects in molding sand, for example to improve fluidity, cohesion or clamping. It may be, for example, saponified oils, fatty acids or their saponified esters or not, glycols, graphite, or additives acting on the activation of bentonite like certain bases.
La composition fluide selon l'invention peut également comprendre un ou plusieurs additifs connus pour leur effet anti-gel comme les éthylènes glycols, ou leur effet antibactérien comme le formol.The fluid composition according to the invention may also comprise one or more additives known for their antifreeze effect such as ethylenes glycols, or their antibacterial effect such as formalin.
Bien que l'un des buts de la présente invention soit de supprimer pour des raisons de santé au poste de travail, l'utilisation de la houille en tant que générateur de carbone brillant, il peut s'avérer utile, pour des raisons techniques, économiques ou de disponiblité de matière première, d'incorporer dans la composition fluide de l'invention de la poudre de houille dont la taille des particules est avantageusement inférieure à 600 microns. Dans ce cas, la teneur en poids de la poudre de houille dans ladite composition sera de préférence inférieure à 50 %.Although one of the aims of the present invention is to remove for health reasons at the workplace, the use of coal as a brilliant carbon generator, it may be useful, for technical reasons, As a result of the economics or availability of the raw material, coal powder of the particle size advantageously less than 600 microns can be incorporated in the fluid composition of the invention. In this case, the weight content of the coal powder in said composition will preferably be less than 50%.
Selon un mode de réalisation avantageux de la composition fluide de l'invention, celle-ci comprend jusqu'à environ 50 % et de préférence 30 % de son poids, d'une poudre minérale poreuse comme par exemple :
- le coke, dont 80 % en poids sera constitué par des particules dont la taille est inférieure à environ 500 microns, et de préférence dont 70 % en poids sera constitué par des particules dont la taille est inférieure à 200 microns,
- un matériau granulaire siliceux ou silico-alumineux poreux dont la taille des particules est inférieure à 600 microns.
- coke, 80% by weight of which will consist of particles whose size is less than about 500 microns, and preferably 70% by weight of which will consist of particles whose size is less than 200 microns,
- a porous siliceous or silico-aluminous granular material having a particle size of less than 600 microns.
L'invention concerne aussi un procédé de préparation d'une composition fluide selon l'invention consistant à incorporer dans le support liquide des particules d'au moins une substance, autre que la houille, capable de produire du carbone brillant, soit sous forme de particules fines dont la taille est inférieure à 500 microns à raison de 50 % de leur poids, sèches ou humides, soit par broyage en phase humide avec ledit support liquide. Le support liquide et les particules utilisés dans ce procédé sont conformes à ceux décrits précédemment dans la composition fluide de l'invention.The invention also relates to a process for preparing a fluid composition according to the invention consisting in incorporating into the liquid carrier particles of at least one substance, other than coal, capable of producing shiny carbon, either in the form of fine particles whose size is less than 500 microns at 50% of their weight, dry or wet, or by grinding wet with said liquid carrier. The liquid carrier and the particles used in this process are in accordance with those previously described in the fluid composition of the invention.
L'invention concerne encore l'utilisation de particules d'une substance, autre que la houille, capable de produire du carbone brillant au cours de la coulée de métal dans le moule, pour la préparation d'une composition fluide constituant un additif pour les sables de moulage en fonderie.The invention also relates to the use of particles of a substance, other than coal, capable of producing glossy carbon during the casting of metal in the mold, for the preparation of a fluid composition constituting an additive for foundry casting sand.
Lesdites particules sont du type défini précédemment dans la composition fluide de l'invention.Said particles are of the type defined previously in the fluid composition of the invention.
L'invention concerne enfin l'utilisation d'un additif défini précédemment pour la préparation d'une composition pour moulage en fonderie, ainsi qu'une composition pour moulage en fonderie à base de sable comprenant un tel additif et son procédé de préparation. Un procédé de préparation d'une composition pour moulage en fonderie consiste à mélanger au sable de fonderie, provenant par exemple du retour après décochage, une quantité d'au moins 0,05 % en poids d'un additif selon l'une quelconque des revendications 1 à 15, soit directement, soit par l'intermédiaire d'un pré-mélange avec d'autre matières.The invention further relates to the use of an additive previously defined for the preparation of a foundry molding composition, and to a sand-based foundry molding composition comprising such an additive and a process for its preparation. A process for preparing a foundry molding composition comprises mixing with the foundry sand, for example from the after-shake-out, an amount of at least 0.05% by weight of an additive according to any one of the following: Claims 1 to 15, either directly or via a premix with other materials.
D'autres avantages et caractéristiques de l'invention apparaîtront à la lecture des exemples qui suivent concernant la préparation et l'utilisation de la composition fluide de l'invention en fonderie.Other advantages and characteristics of the invention will appear on reading the following examples concerning the preparation and use of the fluid composition of the invention in a foundry.
L'exemple qui suit concerne les essais d'utilisation, en tant que générateur de carbone brillant en fonderie, des fines de sélection granulométrique issues en tant que déchets de la fabrication de copolymère styrène-di-vinyl-benzène (S-DVB) pour résines échangeuses d'ions.The following example relates to the use tests, as a foundry-shining carbon generator, of granulometric selection fines derived as waste from the manufacture of styrene-di-vinyl-benzene copolymer (S-DVB) for ion exchange resins.
Ces fines ont tout d'abord été utilisées sous forme pulvérulente conformément à la méthode de l'art antérieur, en les mélangeant avec de la poussière de houille, à raison de 30 % de fines de S-DVB pour 70 % de poussière de houille. On constate en vidant ce mélange sur un plateau et en tapotant légèrement le plateau que les grains de fines S-DVB se séparent nettement des grains de houille, et donc que le mélange devient très facilement hétérogène, ce qui empêche son utilisation en fonderie.These fines were first used in pulverulent form according to the method of the prior art, by mixing them with coal dust, at a rate of 30% of fines of S-DVB for 70% of coal dust. . It is found by emptying this mixture on a plate and tapping the plate slightly that S-DVB fine grains are clearly separated from the coal grains, and therefore the mixture becomes very easily heterogeneous, which prevents its use in foundry.
Le mélange ci-dessus a donc été incorporé dans un liquide puis la composition fluide obtenue a été utilisée dans un moule de fonderie :
- a) Fabrication d'un pré-gel par mélange de :
- 97 g d'eau,
- 0,14 g de Rhodadol 23 commercialisé par la Société Rhône-Poulenc,
- 2,29 g de Empilan NP6 commercialisé par la Société ALBRIGHT-WILSON,
- 0,57 DE Empicol ESB 3M commercialisé par la Société ALBRIGHT-WILSON.
- b) Fabrication de la composition fluide par mélange de :
- 30 g de poussière de houille,
- 35 g de fines S-DVB,
- 35 g de pré-gel de l'étape (a) ci-dessus.
- a) Manufacture of a pre-gel by mixing:
- 97 g of water,
- 0.14 g of Rhodadol 23 sold by Rhône-Poulenc,
- 2.29 g of Empilan NP6 marketed by the ALBRIGHT-WILSON Company,
- 0.57 Empicol ESB 3M marketed by the ALBRIGHT-WILSON Company.
- b) Production of the fluid composition by mixing:
- 30 g of coal dust,
- 35 g of fine S-DVB,
- 35 g of pre-gel from step (a) above.
Le mélange obtenu est d'apparence fluide et homogène et le reste pendant plus de trois semaines, jusqu'à son utilisation décrite ci-dessous.
- c) Fabrication d'un moule de fonderie de composition suivante en poids :
- 100 parties de sable siliceux de granulométrie 55 AFS,
- 7 parties de bentonite calcique activée,
- 3 partie de la composition fluide de l'étape (b) ci-dessus,
- 2 parties d'eau.
- c) Manufacture of a foundry mold of the following composition by weight:
- 100 parts of quartz sand 55 AFS,
- 7 parts of activated calcium bentonite,
- 3 part of the fluid composition of step (b) above,
- 2 parts of water.
On coule alors la fonte liquide dans le moule. Après refroidissement on constate une belle peau de pièce sans défaut et bien décapée.The liquid cast iron is then poured into the mold. After cooling, there is a beautiful skin of room without defect and well pickled.
Claims (17)
- Additive for foundry moulding sands capable of generating lustrous carbon, consisting of a fluid composition comprising:a liquid support composed of a mixture of water and at least one organic liquid, in which the water accounts for at least about 30% of the weight of the liquid support and/or at least 5% by weight of the fluid composition,particles of at least one substance, other than coal, for forming lustrous carbon during casting of the metal,the content of said liquid support being less than 60% by weight of the said composition and the content of the said particles being between 85% and 5% by weight of the said composition.
- Additive according to claim 1, characterised in that the organic liquid is chosen from among aromatic solvents and fatty acids.
- Additive according to either claim 1 or 2, characterised in that at least 50% by weight of the particles of the substance other than coal for forming lustrous carbon, are of a size smaller than about 500 microns.
- Additive according to any one of claims 1 to 3, characterised in that the particles of the substance other than coal for forming lustrous carbon, are particles made from a resinous compound such as polymer or copolymer particles or their mixtures, and having macromolecular chains which comprise carbon and hydrogen atoms to the extent of at least 80% of their weight.
- Additive according to claim 4, characterised in that the particles of the substance other than coal for forming lustrous carbon, , are made from polyolefins or their copolymers or derived copolymers.
- Additive according to any one of claims 1 to 5, characterised in that the particles of the substance other than coal for forming lustrous carbon, , have a capacity for generating lustrous carbon, to produce at least 15% by weight of their weight measured according to the method defined by German foundry industry in Bestimmung von Glanzkohlenstoff-V.D.G. p. 85, October 1980.
- Additive according to any one of claims 1 to 6, characterised in that the particles of the substance other than coal for forming lustrous carbon, , have a content of volatile materials of at least 50% measured according to ISO method 562-1981 and at least 80% of the said volatile materials are released between about 200°C and about 500°C.
- Additive according to any one of claims 1 to 7, characterised in that the particles of the substance other than coal for forming lustrous carbon, have a low content of polycyclic aromatic hydrocarbons and a sulphur content less than 3%.
- Additive according to any one of claims 1 to 8, characterised in that the fluid composition also comprises an appropriate quantity of one or more antisettling agents, flow agents or surfactants, to prevent settlement of the particles or separation of liquid phases.
- Additive according to claim 9, characterised in that the said agents are selected from among clays, bentonites, surfactants and polysaccharides.
- Additive according to any one of claims 1 to 10, characterised in that the fluid composition also comprises 1 to 50% by weight of coal dust having a particle size smaller than about 600 microns.
- Additive according to any one of claims 1 to 11, characterised in that the said fluid composition comprises up to about 50% by weight of a coke powder, about 80% by weight of which is constituted by particles of a size smaller than about 600 microns.
- Additive according to any one of claims 1 to 12, characterised in that the fluid composition comprises up to about 30% by weight of a porous granular siliceous or alumino-siliceous material, the particle size of which is smaller than 600 microns.
- Process for the preparation of an additive according to any one of claims 1 to 13, characterised in that particles of at least one substance other than coal for forming lustrous carbon, are incorporated into a liquid support, either wet or dry in the form of fine particles with 50% by weight of particles being smaller than about 500 microns, or by grinding in the wet phase with the said liquid support.
- Use of an additive according to any one of claims 1 to 13 for the preparation of a composition for casting in a foundry.
- Composition for casting in a foundry, based on sand, comprising an additive according to any one of claims 1 to 13.
- Process for preparation of a composition for casting in a foundry , characterised in that a quantity of at least 0.05% by weight of an additive according to any one of claims 1 to 13 is mixed with the foundry sand, either directly or through a premix with other materials.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9715239A FR2771663B1 (en) | 1997-12-03 | 1997-12-03 | FLUID COMPOSITION CAPABLE OF PRODUCING GLOSSY CARBON DURING CASTING OF METAL AND PROCESS FOR PREPARING THE SAME |
| FR9715239 | 1997-12-03 | ||
| PCT/FR1998/002602 WO1999028064A1 (en) | 1997-12-03 | 1998-12-02 | Fluid composition capable of producing shiny carbon during metal casting and preparation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1035931A1 EP1035931A1 (en) | 2000-09-20 |
| EP1035931B1 true EP1035931B1 (en) | 2006-06-21 |
Family
ID=9514114
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98958311A Expired - Lifetime EP1035931B1 (en) | 1997-12-03 | 1998-12-02 | Fluid composition capable of producing shiny carbon during metal casting and preparation method |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US6506817B1 (en) |
| EP (1) | EP1035931B1 (en) |
| JP (1) | JP2001524389A (en) |
| AT (1) | ATE330732T1 (en) |
| BR (1) | BR9814749A (en) |
| CY (1) | CY1105280T1 (en) |
| DE (1) | DE69835027T2 (en) |
| ES (1) | ES2268803T3 (en) |
| FR (1) | FR2771663B1 (en) |
| PT (1) | PT1035931E (en) |
| WO (1) | WO1999028064A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2771663B1 (en) | 1997-12-03 | 2000-02-18 | Manfred Buchler | FLUID COMPOSITION CAPABLE OF PRODUCING GLOSSY CARBON DURING CASTING OF METAL AND PROCESS FOR PREPARING THE SAME |
| US7507284B2 (en) * | 2004-09-17 | 2009-03-24 | The Hill And Griffith Company | Sandcasting pattern coating compositions containing graphite |
| DE102007020586A1 (en) * | 2007-05-02 | 2008-11-06 | Ashland-Südchemie-Kernfest GmbH | Coating materials for casting molds and cores to avoid reaction gas defects |
| DE102009041677A1 (en) * | 2009-09-16 | 2011-03-24 | Süd-Chemie AG | Foundry additive based on graphite |
| US8426494B2 (en) * | 2009-10-06 | 2013-04-23 | Amcol International Corp. | Lignite urethane based resins for enhanced foundry sand performance |
| US8436073B2 (en) | 2009-10-06 | 2013-05-07 | Amcol International | Lignite-based foundry resins |
| US8853299B2 (en) * | 2009-10-06 | 2014-10-07 | Amcol International Corp. | Lignite-based urethane resins with enhanced suspension properties and foundry sand binder performance |
| EP3856431A4 (en) * | 2018-09-28 | 2022-06-15 | Imerys USA, Inc. | Production of foundry premix composition |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH551236A (en) * | 1968-11-07 | 1974-07-15 | Reinshagen & Vogt Ravensberger | MOLDING COMPOUNDS FOR CASTING MOLDS. |
| AT314749B (en) * | 1970-12-02 | 1974-04-25 | Reichhold Chemie Ag | Molding additive for the production of molds and cores for foundry purposes |
| US4174225A (en) * | 1976-04-12 | 1979-11-13 | Ab Nynas-Petroleum | Manufacturing moulds or mould cores |
| JPS5820344A (en) * | 1981-07-27 | 1983-02-05 | Kao Corp | Powdered coating agent |
| AU613437B2 (en) * | 1988-01-12 | 1991-08-01 | Borden (Uk) Limited | Foundry moulding composition |
| US5027890A (en) * | 1988-01-12 | 1991-07-02 | Borden (Uk) Limited | Foundry moulding composition |
| DE3841473A1 (en) * | 1988-12-09 | 1990-06-13 | Heinze Gerald | Moulding sand for foundry purposes |
| EP0549547A1 (en) * | 1991-12-24 | 1993-06-30 | Laviosa Chimica Mineraria S.P.A. | Green moulding sands containing fatty acids and trigycerides |
| DE19643514A1 (en) * | 1996-10-22 | 1998-04-23 | Metallgesellschaft Ag | Process for producing molding sand for foundry purposes |
| FR2771663B1 (en) | 1997-12-03 | 2000-02-18 | Manfred Buchler | FLUID COMPOSITION CAPABLE OF PRODUCING GLOSSY CARBON DURING CASTING OF METAL AND PROCESS FOR PREPARING THE SAME |
-
1997
- 1997-12-03 FR FR9715239A patent/FR2771663B1/en not_active Expired - Lifetime
-
1998
- 1998-12-02 ES ES98958311T patent/ES2268803T3/en not_active Expired - Lifetime
- 1998-12-02 PT PT98958311T patent/PT1035931E/en unknown
- 1998-12-02 JP JP2000523025A patent/JP2001524389A/en active Pending
- 1998-12-02 AT AT98958311T patent/ATE330732T1/en not_active IP Right Cessation
- 1998-12-02 EP EP98958311A patent/EP1035931B1/en not_active Expired - Lifetime
- 1998-12-02 DE DE69835027T patent/DE69835027T2/en not_active Expired - Lifetime
- 1998-12-02 WO PCT/FR1998/002602 patent/WO1999028064A1/en active IP Right Grant
- 1998-12-02 BR BR9814749-8A patent/BR9814749A/en not_active Application Discontinuation
-
2000
- 2000-06-02 US US09/586,371 patent/US6506817B1/en not_active Expired - Fee Related
-
2006
- 2006-09-20 CY CY20061101347T patent/CY1105280T1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| ATE330732T1 (en) | 2006-07-15 |
| DE69835027D1 (en) | 2006-08-03 |
| BR9814749A (en) | 2000-10-03 |
| FR2771663A1 (en) | 1999-06-04 |
| FR2771663B1 (en) | 2000-02-18 |
| WO1999028064A1 (en) | 1999-06-10 |
| CY1105280T1 (en) | 2010-03-03 |
| EP1035931A1 (en) | 2000-09-20 |
| DE69835027T2 (en) | 2007-01-11 |
| PT1035931E (en) | 2006-11-30 |
| JP2001524389A (en) | 2001-12-04 |
| US6506817B1 (en) | 2003-01-14 |
| ES2268803T3 (en) | 2007-03-16 |
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