WO1995033577A1 - Process for water-proofing metal elements, preferably large bobbins and product used with such process - Google Patents
Process for water-proofing metal elements, preferably large bobbins and product used with such process Download PDFInfo
- Publication number
- WO1995033577A1 WO1995033577A1 PCT/ES1994/000057 ES9400057W WO9533577A1 WO 1995033577 A1 WO1995033577 A1 WO 1995033577A1 ES 9400057 W ES9400057 W ES 9400057W WO 9533577 A1 WO9533577 A1 WO 9533577A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- preferably large
- seconds
- metal elements
- immersed
- dried
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
- B05D7/16—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies using synthetic lacquers or varnishes
- B05D7/18—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies using synthetic lacquers or varnishes based on cellulose derivatives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
Definitions
- the present invention refers to a process for protecting a metal element from corrosion, particularly in the form of a sheet metal coil or package and the product used for this purpose.
- Metal products are subject to oxidation when exposed to the aggression of environmental agents. This attack is much greater when subjected to saline, acidic, very humid environments, or any other highly corrosive conditions.
- the object of the present invention is a process that gives rise to a new concept of protection and the product used in said process; for which the idea of protection is based on nature itself, on the ideal conservation conditions of fossilized insects that have remained to this day.
- This concept of insulating a metallic element from the external oxidizing agents by generating a layer of plastic material allows virtually indefinite storage and. exposure of the protective layer / metal element set to any type of environment.
- This method is capable of covering all kinds of metal elements, but considering these as a volume and not as a surface, as is the case of a metal coil or a set consisting of sheets.
- a coil of sheet 12,000 Kg has an area of 12m 2.
- This sheet metal weight which has a market price of approximately $ 6,100, can be protected from oxidation with 12 kg of plastic, covering the entire surface of the coil with a thickness of 1,000 microns.
- the procedure consists, basically, in the immersion of the coil or the set of plates in a hot plastic bath that completely covers it, isolating it from the external agents, keeping it like this until it is removed, the protection, when its need for use be immediate
- the coating is made by a plasticized cellulosic ester that melts at 175 ° -190 ° C resulting in an elastic and transparent film so that the thickness can be regulated by the temperature obtaining a film that is much thinner the higher the temperature. In the case that a thicker layer is desired, the submersion of the piece in the plastic can be repeated.
- the plastic is composed of 30-33% cellulosic resins, 67-70% of plasticizers and additives that provide the protection qualities of the product. Said plastic is prepared by melting the resins and subsequently adding the plasticizers in a reactor with low agitation at 150 ° C.
- the coating has an antioxidant element and a non-stick compound and the piece is immersed in the bath for 20 seconds, then dried in room air for 30 seconds.
- Figure 1 is a perspective and elevational view of a guide bridge with the coil hanging from it and reservoir containing the plastic bath.
- Figure 2 is an elevation and perspective view in another variant in which a set of plates is arranged instead of a coil.
- the package or the coil is transported to a bath (4) containing hot plastic according to the described composition at a constant and suitable temperature by any heating system.
- the necessary tools (3) have been arranged to perfectly lift and move the metal parts.
- a subsequent cooling of the plastic, protective layer achieves a total embedding of the element until it is completely isolated from the outside.
- This cooling phase can be carried out by movement in the environment or by artificial measures such as ventilation etc.
- the protective material contained in the tank (4) can have any shade or color; It is also possible to record in the protection any type of inscription on the characteristics of the product contained or protected; In this way it is not necessary to break the coating to know what product it is and its most notorious characteristics.
Abstract
Process for water-proofing metal elements, preferably large bobbins, and product used with said process which comprises two phases: an immersion phase and a cooling/drying phase. In the first immersion phase, the metal element is immersed in a liquid plastic material bath during a short period of time but sufficiently long to obtain a hardened layer of small thickness and a penetration of the isolating agent into the material cracks, if any, while in the second phase the plastic film is cooled/dried by aeration which solidifies the synthetic layer formed around the material. Both operations can be carried out by using a crane or hoisting blocks and the tools appropriate to the shape and size of the element to be protected, and the plastic material presenting a tonality corresponding to the characteristics of the element, gravings can be performed before and/or after the cooling. The product for water-proofing metal elements is a plastified cellulosic ester which melts at 175°-190 °C forming a film which is all the more transparent and thin than the temperature is high, the part to be protected being immersed in the bath during 20 seconds and dried in ambient air during 30 seconds.
Description
Procedimiento de impermeabilización de elementos metálicos preferentemente grandes bobinas, y el producto utilizado para dicho procedimiento. La presente invención, como su nombre indica se refiere a un procediemiento para proteger de la corrosión un elemento metálico, particularmente presentado en forma de una bobina o paquete de chapa y el producto utilizado a tal fin. Waterproofing process of metallic elements, preferably large coils, and the product used for said process. The present invention, as the name implies, refers to a process for protecting a metal element from corrosion, particularly in the form of a sheet metal coil or package and the product used for this purpose.
Los productos metálicos están sometidos a oxidación cuando se exponen a la agresión de los agentes ambientales. Este ataque es mucho mayor cuando se someten a ambientes salinos, ácidos, con mucha humedad, o cualesquiera otras condiciones altamente corrosivas. Metal products are subject to oxidation when exposed to the aggression of environmental agents. This attack is much greater when subjected to saline, acidic, very humid environments, or any other highly corrosive conditions.
Se han generado algunos procedimientos que tienden a paliar con mayor o menor éxito esta degradación. Los más conocidos consisten en impregnaciones o inmersión en pasivantes; no obstante, estos procedimientos proporcionan protecciones de muy corta duración, o en condiciones de almacenamiento óptimas, pero resultan inadecuadas para espacios de tiempo largos, contra los agentes atmosféricos, como la lluvia, aire, sol o hielo, etc. Por otra parte los medios de protección tales como recubrimientos de lacas, pinturas, galvanizados, etc. resultan caros. Some procedures have been generated that tend to alleviate this degradation with greater or lesser success. The best known are impregnations or immersion in passivants; However, these procedures provide protections of very short duration, or in optimal storage conditions, but are unsuitable for long periods of time, against atmospheric agents, such as rain, air, sun or ice, etc. On the other hand the protection means such as coatings of lacquers, paints, galvanized, etc. They are expensive.
Resulta por ello evidente que se requiere otro tipo de protecciones que dilaten el periodo de protección prácticamente a indefinido y que a la vez no requieran costes elevados. También es importante lograr una protección que no requiera condiciones especiales de almacenamiento que no dafíe el medio ambiente, es decir, que no sea tóxico, ni maloliente, etc., y que sea
fácilmente reciclable. It is therefore evident that other types of protections are required that extend the protection period to almost indefinite and at the same time do not require high costs. It is also important to achieve protection that does not require special storage conditions that do not harm the environment, that is, that is not toxic, or smelly, etc., and that is easily recyclable
Estas condiciones se requieren en muchos materiales que por peso, volumen, forma, utilización, etc., no se consideran aptos para almecenamiento bajo techo en condiciones optimizadas de humedad o temperatura. These conditions are required in many materials that, by weight, volume, shape, use, etc., are not considered suitable for indoor storage under optimized conditions of humidity or temperature.
El objeto de la presente invención consite en un procediemiento que da lugar a un nuevo concepto de protección y el producto utilizado en dicho procedimiento; para lo cual la idea de protección esté basada en la propia naturaleza, en las condiciones ideales de conservación de los insectos fosilizados que han permanecido hasta nuestros días. Este concepto de aislamiento de un elemento metálico de los agentes oxidantes exteriores mediante la generación de una capa de material plástico permite el almacenamiento prácticamente indefinido y la. exposición del conjunto capa protectora/elemento metálico a cualquier tipo de ambientes. The object of the present invention is a process that gives rise to a new concept of protection and the product used in said process; for which the idea of protection is based on nature itself, on the ideal conservation conditions of fossilized insects that have remained to this day. This concept of insulating a metallic element from the external oxidizing agents by generating a layer of plastic material allows virtually indefinite storage and. exposure of the protective layer / metal element set to any type of environment.
Este método es capaz de recubrir todo tipo de elementos metálicos, pero considerando estos como un volumen y no como una superficie, como es el caso de una bobina de metal o un conjunto compuesto de chapas. una bobina de chapa de 12.000 Kg de peso tiene una superficie de 12m2. Este peso de chapa, que tiene un precio en el mercado de $ 6.100 aproximadamente, se puede proteger de la oxidación con 12 Kg de plástico, quedando recubierta toda le superficie de la bobina con un espesor de 1.000 micras. This method is capable of covering all kinds of metal elements, but considering these as a volume and not as a surface, as is the case of a metal coil or a set consisting of sheets. a coil of sheet 12,000 Kg has an area of 12m 2. This sheet metal weight, which has a market price of approximately $ 6,100, can be protected from oxidation with 12 kg of plastic, covering the entire surface of the coil with a thickness of 1,000 microns.
El precio del plástico es de 2,8 $/Kg, por lo tanto, la relación costo del Kg de plástico/costo del Kg
de chapa a proteger (6.100 ÷ 12), es muy pequefía: The price of plastic is 2.8 $ / Kg, therefore, the cost ratio of plastic Kg / cost of Kg of sheet to protect (6,100 ÷ 12), it is very small:
2,8 $ / 508 $ = 0,0055 Por otra parte, el tiempo de aplicación del método es mínimo, ya que, en un minuto aproximadamente, la bobina queda recubierta, y protegida. $ 2.8 / $ 508 = 0.0055 On the other hand, the time of application of the method is minimal, since, in approximately one minute, the coil is covered, and protected.
Ensayos, con bobinas de mediano tamafío, se han efectuado en una empresa espafíola, con probetas de ensayo introducidas en niebla salina y atmósfera de amoniaco durante 700 horas. Extrapolando los resultados, se vió que podria garantizarse la protección de las bobinas por un periodo de 4 afíos. Tests, with medium-sized coils, have been carried out in a Spanish company, with test specimens introduced in saline fog and ammonia atmosphere for 700 hours. Extrapolating the results, it was seen that the protection of the coils could be guaranteed for a period of 4 years.
El procedimiento consiste, básicamente, en la inmersión de la bobina o el conjunto de chapas en un bafío de plástico caliente que la recubra por completo, aislándola de los agentes exteriores, manteniéndola así hasta que se quita, la protección, cuando su necesidad de uso sea inmediata. The procedure consists, basically, in the immersion of the coil or the set of plates in a hot plastic bath that completely covers it, isolating it from the external agents, keeping it like this until it is removed, the protection, when its need for use be immediate
El recubrimiento se hace mediante un éster celulósico plastificado que se funde a 175º-190ºC dando lugar a una película elástica y transparente de modo que el grosor puede regularse por la temperatura obteniendo una película tanto más fina cuanto mayor sea la temperatura. En el caso de que se desee una capa más gruesa se puede repetir la sumersión de la pieza en el plástico. El plástico esta compuesto por 30-33% Resinas celulósicas, 67-70% de plastificantes y aditivos que proporcionan las cualidades de protección del producto. Dicho plástico se prepara fundiendo las resinas y afíadiendo posteriormente los plastificantes en un reactor con baja agitación en 150ºC.
El recubrimiento lleva un elemento antioxidante y un compuesto antiadherente y la pieza se sumerge en el bafío durante 20 segundos secándose después al aire ambiente durante 30 segundos. The coating is made by a plasticized cellulosic ester that melts at 175 ° -190 ° C resulting in an elastic and transparent film so that the thickness can be regulated by the temperature obtaining a film that is much thinner the higher the temperature. In the case that a thicker layer is desired, the submersion of the piece in the plastic can be repeated. The plastic is composed of 30-33% cellulosic resins, 67-70% of plasticizers and additives that provide the protection qualities of the product. Said plastic is prepared by melting the resins and subsequently adding the plasticizers in a reactor with low agitation at 150 ° C. The coating has an antioxidant element and a non-stick compound and the piece is immersed in the bath for 20 seconds, then dried in room air for 30 seconds.
Se comprenderá mejor el objeto de la presente invención con ayuda de la descripción siguiente efectuada en base a un ejemplo práctico de realización. Dicha descripción se efectúa con ayuda de los dibujos anexos en los que: The object of the present invention will be better understood with the aid of the following description made on the basis of a practical embodiment. This description is made with the help of the attached drawings in which:
La figura 1 es una vista en perspectiva y alzado de un puente guía con la bobina colgando de él y depósito que contiene el bafío de plástico. Figure 1 is a perspective and elevational view of a guide bridge with the coil hanging from it and reservoir containing the plastic bath.
La figura 2 es una vista en alzado y perspectiva en otra variante en el que se dispone un conjunto de chapas en vez de una bobina. En la grúa puente (1) se transporta el paquete o la bobina hasta un bafío (4) que contiene plástico caliente según la composición descrita a temperatura constante y adecuada mediante cualquier sistema de calentamiento. En el cabezal (2) de dicho puente grúa se han dispuesto los útiles (3) necesarios para izar y mover perfectamente las piezas metálicas. Figure 2 is an elevation and perspective view in another variant in which a set of plates is arranged instead of a coil. In the bridge crane (1) the package or the coil is transported to a bath (4) containing hot plastic according to the described composition at a constant and suitable temperature by any heating system. In the head (2) of said crane bridge, the necessary tools (3) have been arranged to perfectly lift and move the metal parts.
Un posterior enfriamiento de la capa plástica, protectora logra un embebido total del elemento hasta quedar totalmente aislado del exterior. Esta fase de enfriamiento puede realizarse por el movimiento en el ambiente o por medidas artificiales como ventilación etc. A subsequent cooling of the plastic, protective layer achieves a total embedding of the element until it is completely isolated from the outside. This cooling phase can be carried out by movement in the environment or by artificial measures such as ventilation etc.
El material de protección contenido en la cuba (4) puede presentar cualquier tonalidad o color;
igualmente es posible grabar en la protección cualquier tipo de inscripción sobre las características del producto contenido o protegido; de este modo no es necesario romper el recubrimiento para poder saber de que producto se trata y sus características más notorias. The protective material contained in the tank (4) can have any shade or color; It is also possible to record in the protection any type of inscription on the characteristics of the product contained or protected; In this way it is not necessary to break the coating to know what product it is and its most notorious characteristics.
Una vez descrita suficientemente la naturaleza del presente invento, así como una forma, de llevarlo a la práctica, sólo nos queda por afíadir que en su conjunto y partes que lo componen es posible introducir cambios de forma, materiales y de disposición, siempre y cuando dichas alteraciones no varíen sustancialmente las características del invento que se reivindican a continuación
Once the nature of the present invention has been sufficiently described, as well as a way of putting it into practice, we can only say that as a whole and its component parts it is possible to introduce changes in form, materials and layout, provided said alterations do not substantially vary the characteristics of the invention claimed below.
Claims
1.- Procediemiento de impermeabilización de elementos metálicos, preferentemente grandes bobinas, caracterizado porque consta esencialmente de dos fases: una de inmersión y otra de enfriamiento/secado. De las cuales en la primera de ellas se sumerge el elemento metálico en un bafío de material plástico en estado líquido, durante un corto periodo de tiempo, pero en todo caso suficiente para lograr una capa endurecida de ligero espesor y una penetración del aislante en las posibles grietas del material, mientras que en la segunda fase se enfría/seca la película plástica por aireación que solidifica la capa sintética, creada en torno a él, realizándose ambas operaciones con ayuda de una grúa o polipasto y los útiles adecuados a. la forma y dimensiones del elemento a proteger, y porque el material plástico presenta una tonalidad acorde en correpondencia con las características del elemento, practicándose incluso antes y/o después del enfriado grabaciones correspondientes con éstas. 1.- Procedure for waterproofing metallic elements, preferably large coils, characterized in that it consists essentially of two phases: one of immersion and another of cooling / drying. Of which in the first of them the metallic element is immersed in a bath of plastic material in a liquid state, for a short period of time, but in any case sufficient to achieve a hardened layer of slight thickness and a penetration of the insulator in the possible cracks of the material, while in the second phase the plastic film is cooled / dried by aeration that solidifies the synthetic layer, created around it, both operations being carried out with the help of a crane or hoist and the appropriate tools a. the shape and dimensions of the element to be protected, and because the plastic material has a hue in accordance with the characteristics of the element, being made even before and / or after cooling corresponding recordings with them.
2.- Procediemiento de impermeabilización de elementos metálicos, preferentemente grandes bobinas, según la reivindicación anterior, caracterizado porque el grosor del recubrimiento puede regularse por la temperatura obteniendo una película tanto más fina cuanto mayor sea la temperatura y porque la pieza se sumerge en el bafío durante 20 segundos, secándose después a través de medios de secado bien artificiales bien el aire ambiente siendo la duración del secado en el último caso de 30 segundos. 2. Method of waterproofing metal elements, preferably large coils, according to the preceding claim, characterized in that the thickness of the coating can be regulated by the temperature obtaining a film that is much thinner the higher the temperature and because the piece is immersed in the bath for 20 seconds, the ambient air is then dried through artificially well drying means, the drying time being in the latter case of 30 seconds.
3.- Producto utilizado para un procedimiento de impermeabilización de elementos metálicos, preferentemente grandes bobinas caracterizado porque se prepara a base de un éster celulósico plastificado que se funde a 175º-190ºC preferentemente compueto por 30-33% resinas celulósicas, 67-70% de plastificantes y aditivos que proporcionan las cualidades de protección del producto. 3.- Product used for a waterproofing process of metallic elements, preferably large coils characterized in that it is prepared based on a plasticized cellulosic ester that melts at 175 ° -190 ° C preferably composed of 30-33% cellulosic resins, 67-70% plasticizers and additives that provide the product's protective qualities.
El modo de preparación es fundir las resinas y afíadir posteriormente los plastificantes en reactor con baja agitación a 150ºC. The way of preparation is to melt the resins and subsequently refine the plasticizers in a reactor with low agitation at 150 ° C.
4.- Producto según la reivindicación 3 caracterizado porque el recubrimiento lleva un elemento antioxidante y un compuesto antiadherente. 4. Product according to claim 3 characterized in that the coating has an antioxidant element and a non-stick compound.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP94916993A EP0736334A1 (en) | 1994-06-06 | 1994-06-06 | Process for water-proofing metal elements, preferably large bobbins and product used with such process |
| PCT/ES1994/000057 WO1995033577A1 (en) | 1994-06-06 | 1994-06-06 | Process for water-proofing metal elements, preferably large bobbins and product used with such process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/ES1994/000057 WO1995033577A1 (en) | 1994-06-06 | 1994-06-06 | Process for water-proofing metal elements, preferably large bobbins and product used with such process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1995033577A1 true WO1995033577A1 (en) | 1995-12-14 |
Family
ID=8284906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/ES1994/000057 WO1995033577A1 (en) | 1994-06-06 | 1994-06-06 | Process for water-proofing metal elements, preferably large bobbins and product used with such process |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0736334A1 (en) |
| WO (1) | WO1995033577A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1008876C2 (en) * | 1998-04-14 | 1999-10-15 | Hoogovens Staal Bv | Method for shielding stacked metal strip, thus shielded stack and sprayable plastic, suitable for use in this method. |
| FR2781703B1 (en) * | 1998-07-30 | 2000-09-22 | Lorraine Laminage | TREATMENT PROCESS LIMITING OVEROXIDATION OF THE SHORES OF A HOT-ROLLED AND SHEET METAL STRIP AT THE EXIT OF A STRIP TRAIN |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE428073C (en) * | 1924-12-02 | 1926-04-22 | Neuwalzwerk Akt Ges Fa | Method for covering wire meshes and the like like |
| US2350744A (en) * | 1940-12-19 | 1944-06-06 | Eastman Kodak Co | Gelation coating process |
| US2661307A (en) * | 1949-01-19 | 1953-12-01 | Westinghouse Electric Corp | Process for applying a completely polymerizable thermosetting resinous composition to an electrical member |
| US2919208A (en) * | 1955-11-03 | 1959-12-29 | Dow Chemical Co | Coating metal articles |
| US2978098A (en) * | 1958-04-29 | 1961-04-04 | Republic Foil Inc | Coating aluminum foil with silicone |
| GB1254848A (en) * | 1968-01-22 | 1971-11-24 | English Electric Co Ltd | Process for coating articles with resin |
| US3904785A (en) * | 1974-01-11 | 1975-09-09 | Gen Electric | Method for insulating electric armature windings |
| US5094891A (en) * | 1990-02-02 | 1992-03-10 | A. O. Smith Corporation | Vertical dip thin perimeter manufacturing method and facility for coating vehicle structural components |
-
1994
- 1994-06-06 EP EP94916993A patent/EP0736334A1/en not_active Withdrawn
- 1994-06-06 WO PCT/ES1994/000057 patent/WO1995033577A1/en not_active Application Discontinuation
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE428073C (en) * | 1924-12-02 | 1926-04-22 | Neuwalzwerk Akt Ges Fa | Method for covering wire meshes and the like like |
| US2350744A (en) * | 1940-12-19 | 1944-06-06 | Eastman Kodak Co | Gelation coating process |
| US2661307A (en) * | 1949-01-19 | 1953-12-01 | Westinghouse Electric Corp | Process for applying a completely polymerizable thermosetting resinous composition to an electrical member |
| US2919208A (en) * | 1955-11-03 | 1959-12-29 | Dow Chemical Co | Coating metal articles |
| US2978098A (en) * | 1958-04-29 | 1961-04-04 | Republic Foil Inc | Coating aluminum foil with silicone |
| GB1254848A (en) * | 1968-01-22 | 1971-11-24 | English Electric Co Ltd | Process for coating articles with resin |
| US3904785A (en) * | 1974-01-11 | 1975-09-09 | Gen Electric | Method for insulating electric armature windings |
| US5094891A (en) * | 1990-02-02 | 1992-03-10 | A. O. Smith Corporation | Vertical dip thin perimeter manufacturing method and facility for coating vehicle structural components |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0736334A1 (en) | 1996-10-09 |
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