DE880720C - Method and device for covering surfaces with polycondensation products - Google Patents
Method and device for covering surfaces with polycondensation productsInfo
- Publication number
- DE880720C DE880720C DED6648D DED0006648D DE880720C DE 880720 C DE880720 C DE 880720C DE D6648 D DED6648 D DE D6648D DE D0006648 D DED0006648 D DE D0006648D DE 880720 C DE880720 C DE 880720C
- Authority
- DE
- Germany
- Prior art keywords
- polycondensation products
- melt
- melted
- gas stream
- wire
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
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
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
- B05B7/1606—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air
- B05B7/1613—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air comprising means for heating the atomising fluid before mixing with the material to be sprayed
- B05B7/162—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air comprising means for heating the atomising fluid before mixing with the material to be sprayed and heat being transferred from the atomising fluid to the material to be sprayed
- B05B7/1626—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air comprising means for heating the atomising fluid before mixing with the material to be sprayed and heat being transferred from the atomising fluid to the material to be sprayed at the moment of mixing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
- B05B7/168—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed with means for heating or cooling after mixing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
- B05B7/18—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the material having originally the shape of a wire, rod or the like
-
- 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
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
- B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
- B05D3/0413—Heating with air
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Nozzles (AREA)
Description
Verfahren und Vorrichtung zum Oberziehen von Oberflächen mit Polykondensationsprodukten Um beliebige Oberflächen mit Schichten aus art-, fremden Stoffen zu überziehen, kann man entweder eine Lösung des Stoffes in flüchtigen Lösungsmitteln anwenden oder den Überzugsstoff in Form eines fertigen Flächengebildes auf die zu überziehende Oberfläche aufkleben oder das Überzugsmaterial in festem, feinpulverisiertem oder in geschmolzenem Zustand aufbringen und zu einem geschlossenen Überzug durch Wärme verschmelzen. Für die Ausübung des letztgenannten Verfahrens kamen bisher eine verhältnismäßig geringe Anzahl schmelzbarer Natur- oder Kunstharze in Frag. Da es sich hier zum Teil um härtbare Harze handelt, bestand der Nachteil, daß die für das Schmelzen notwendige Temperatur den Härtungsvorgang so weit teilt, däß ein gleichmäßiges Auftragen der Schmelze oft nicht mehr möglich ist. Außerdem erfordern derartige Harzschichten noch eine nachträgliche Behandlung, um Beständigkeit gegen aggressive Chemikalien, Lösungsmittel od. dgl. herzustellen.Method and device for covering surfaces with polycondensation products To cover any surface with layers of foreign materials, you can either use a solution of the substance in volatile solvents or the coating material in the form of a finished sheet onto the one to be coated Glue the surface or the coating material in solid, finely powdered or Apply in the molten state and form a closed coating by heat merge. For the exercise of the last-mentioned procedure, there have so far been a proportionate one small number of fusible natural or synthetic resins in frag. Since this is the Part to curable resins, there was the disadvantage that the melting necessary temperature divides the hardening process so far that an even application the melt is often no longer possible. In addition, such resin layers require a subsequent treatment to ensure resistance to aggressive chemicals, Solvent or the like. To produce.
Es wurde nun gefunden, daß sich ohne derartige Nachteile widerstandsfähige Schichten auf beliebigen Oberflächen, insbesondere auf Metall, Holz, Papier, Textilien, keramischen Körpern, Beton und Stein, herstellen lassen, indem man lineare synthetische Polykondensationsprodukte mit kurzem Schmelzpunktsintervall, insbesondere Polyamide, Polyester, Polyanhydride, , Polyurethane, im Schmelzfluß-auf die Oberflachen aufbringt. Es hat sich gezeigt, daß man einen gleichmäßigen Überzug auf der zu bedeckenden Oberfläche erzielen kann, wenn man das. Polykondensationsprodukt direkt aus dem festen Zustand heraus mittels eines entsprechend angewärmten Gasstromes als- feinverteilte Schmelze auf die Oberfläche durch Aufspritzen aufbringt.It has now been found that they are resistant without such disadvantages Layers on any surface, especially on metal, wood, paper, textiles, ceramic bodies, concrete and stone, by making linear synthetic Polycondensation products with a short melting point interval, especially polyamides, Polyesters, polyanhydrides, , Polyurethanes, in the melt flow-on the Applying surfaces. It has been shown that a uniform coating can be obtained can be achieved on the surface to be covered if the. Polycondensation product directly from the solid state by means of a correspondingly heated gas flow as a finely divided melt applied to the surface by spraying.
Die Gefahr einer Überhitzung der Schmelze' oder einer störenden Einwirkung des Luftsauerstoffes ist dadurch ausgeschlossen, und .es erübrigt sich auch die vorherige Herstellung einer Schmelze in einem besonderen Vorratsbehälter und die Zuführung durch erwärmte Leitungen.The risk of overheating of the melt or a disruptive effect of atmospheric oxygen is excluded, and it is also unnecessary previous production of a melt in a special storage container and the Feed through heated lines.
Wie gefunden wurde, genügt es 'zur Erzielung eines gleichmäßigen Überzuges, einen .auf Temperaturen oberhalb des Schmelzpunktes des_Polykondensationsproduktes vorgewärmten Gastrom über das' feste Polykondensat zu leiten, hierdurch eine-bestimmte Schicht zu schmelzen und im Schmelzzustand sofort weiterzuführen. Eine Beschleunigung des Aufschmel-. zens der Polykondensate läßt sich noch dadurch erzielen, daß der Oberfläche strahlende Wärme, gegebenenfalls unter Benutzung entsprechender Reflektoren, zugeführt wird.As has been found, it is sufficient to achieve a uniform coating one. to temperatures above the melting point of the polycondensation product To direct preheated gas flow over the 'solid polycondensate, thereby a certain Melt the layer and continue immediately in the melted state. An acceleration of the melting. zens of the polycondensates can still be achieved in that the Radiant heat on the surface, if necessary using appropriate reflectors, is fed.
- _ Das im Schmelzfluß zu spritzende Polykondensat befindet sich zweckmäßig in Draht-, Stab- oder Bandform oder ähnlichen Gebilden, wobei die Oberfläche einer Schmalseite. sich. jeweils im Strömungsweg des erwärmten Gasstromes befindet. -Der Nachschub des Stabes oder Bandes erfolgt automatisch mit Hilfe von Druckluft oder Elektrizität. Da der Werkstoff außerhalb der Spritzvorrichtung bei gewöhnlicher Temperatur gehalten und nur jeweils eine kleine Menge in kurzer Zeit bis zum Schmelzen erhitzt wird, - so ist eine weitgehende Schonung des Werkstoffes gewährleistet.- _ The polycondensate to be sprayed in the melt flow is appropriate in wire, rod or ribbon form or similar structures, the surface of a Narrow side. themselves. each located in the flow path of the heated gas stream. -Of the The rod or tape is replenished automatically with the aid of compressed air or Electricity. Since the material is outside the spray device with ordinary Maintained temperature and only a small amount in a short time until it melts is heated, - this ensures extensive protection of the material.
Während der Zuführung wird das Polykondensat gegebenenfalls durch eine Vörwärmzone geleitet, deren Temperatur jedoch stets unterhalb des Schmelzintervalls des Stoffes liegen muß.During the supply, the polycondensate is if necessary through a preheating zone is passed, but its temperature is always below the melting range of the material must lie.
Bei Anwendung von höherschmelzenden Polykon-. densationsprodukten ist es- vorteilhaft, die -zu überziehende Fläche in an sich bekannter Weise anzuwärmen, gegebenenfalls kurz vor bzw. während des Aufspritzens der Schmelze. Zu diesem -Zweck kann an- der Austrittsöffnung des Spritzgerätes noch eine Heizvorrichtung zur Abgabe strahlender Wärme, die gegebenenfalls durch Anbringung von Reflektoren noch auf die zu überziehende Fläche konzentriert wird, angeordnet sein. Dies hat den Vorteil, daß die aus der Spritzvorrichtung austretende Schmelze bis zum Auftreffen auf die zu überziehende Oberfläche keine wesentliche Temperaturerniedrigung erfährt, so daß der gebildete Überzug sehr gleichmäßig wird.When using higher melting polycon-. densation products It is advantageous to warm up the surface to be coated in a manner known per se, possibly shortly before or during the spraying of the melt. To this end At the outlet opening of the spray device, a heating device can also be used for delivery radiating warmth, which may be caused by attaching reflectors the area to be covered is concentrated. This has the advantage that the emerging from the spray device melt until it hits the surface to be coated does not experience any significant temperature decrease, so that the coating formed is very uniform.
Gegebenenfalls kann nach beendetem Auftrag der Schmelze eine derartige Vorrichtung noch benutzt werden, um die Oberfläche des Überzuges zu glätten. Für das Verfahren eignen sich besonders unlösliche Polykondensationsprodukte, z. B. die durch Kondensation eines Diisocyanates mit einem Glykol erhaltenen Polyurethane, wie etwa das Polyurethan aus i . 6-Hexandüsocyanat und i . 4-Butylenglycol (Schmelzpunkt 188 bis igo°C), ferner das Polycaprolactam (Schmelzpunkt 2q.o°C) oder das Polyhexamethylendiaminadipat (Schmelzpunkt 250°C).If necessary, after the application of the melt has ended, such a coating can be used Device can still be used to smooth the surface of the coating. For the process are particularly suitable for insoluble polycondensation products, e.g. B. the polyurethanes obtained by condensation of a diisocyanate with a glycol, such as the polyurethane from i. 6-hexane diisocyanate and i. 4-butylene glycol (melting point 188 to igo ° C), also the polycaprolactam (melting point 2q.o ° C) or the polyhexamethylene diamine adipate (Melting point 250 ° C).
Die Polykondensationsprodukte können gegebenenfalls reit Zusätzen von Pigmenten, Metallpulver, Füllstoffen, Weichmachern versetzt werden. Ferner kann man die Oberflächeneigenschaften der aufgetragenen Überzüge durch Aufstreuen von Sand, Mörtel, Graphit, Metall od. dgl. besonderen Erfordernissen anpassen.The polycondensation products can optionally contain additives be mixed with pigments, metal powder, fillers, plasticizers. Furthermore can the surface properties of the applied coatings by sprinkling on Adapt sand, mortar, graphite, metal or the like to special requirements.
In der Abbildung ist eine Vorrichtung zur Ausübung des Verfahrens dargestellt. Einer Spritzpistole wird das zu verspritzende Polykondensationsprodukt in norm eines Drahtes e von etwa 2 mm Stärke mit Hilfe- der Fördereinrichtung h zugeführt. Das obere Ende des Drahtes wird in. einer Vorwärmzone g und d bis kurz unterhalb des -Schmelzintervalls erwärmt (im Fall des obenerwähnten Polyurethans wird beispielsweise die Temperatur dieser Vorwärmzone auf etwa 175 bis i8o°C eingestellt). Auf das freie Ende des Drahtes trifft der durch eine geeignete Düse zugeführte und mit Hilfe der Heizspirale f auf Zoo bis 250°C erwärmte Gasstrom, der z. B. aus Stickstoff oder aus Kohlensäure bestehen kann. Hierdurch wild die Spitze des Kunststoffdrahtes schmelzbar-flüssig und von dem Gasstrom in diesem Zustand auf die zu überziehende Oberfläche A aufgespritzt. Die in dieser Weise aus der Spritzvorrichtung hindurchgeschleuderten Schmelztröpfchen des Kunststoffes treten dabei durch die beheizte Zone hindurch, die von der an der Austrittsöffnung des Spritzgerätes angeordneten zusätzlichen Heizspirale c hergestellt wird.In the picture is a device for performing the procedure shown. The polycondensation product to be sprayed becomes a spray gun in the standard of a wire e of about 2 mm thickness with the aid of the conveyor h fed. The upper end of the wire is briefly in a preheating zone g and d heated below the melting interval (in the case of the above-mentioned polyurethane For example, the temperature of this preheating zone is set to around 175 to 180 ° C). The wire fed through a suitable nozzle meets the free end of the wire with the help of the heating coil f on zoo to 250 ° C heated gas stream, the z. B. from nitrogen or can consist of carbonic acid. This wildly the tip of the plastic wire meltable-liquid and from the gas flow in this state to the one to be coated Surface A sprayed on. Those thrown through in this way from the spray device Melt droplets of the plastic pass through the heated zone, the additional ones arranged at the outlet opening of the sprayer Heating coil c is made.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DED6648D DE880720C (en) | 1940-09-27 | 1940-09-27 | Method and device for covering surfaces with polycondensation products |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DED6648D DE880720C (en) | 1940-09-27 | 1940-09-27 | Method and device for covering surfaces with polycondensation products |
Publications (1)
Publication Number | Publication Date |
---|---|
DE880720C true DE880720C (en) | 1953-06-25 |
Family
ID=7031787
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DED6648D Expired DE880720C (en) | 1940-09-27 | 1940-09-27 | Method and device for covering surfaces with polycondensation products |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE880720C (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0586912A2 (en) * | 1992-09-08 | 1994-03-16 | MAN Nutzfahrzeuge Aktiengesellschaft | Spray nozzle |
WO1995021028A1 (en) * | 1994-02-07 | 1995-08-10 | Linssen Johannes Joseph Gerard | Method for applying material to a substrate and apparatus for the implementation of the method |
-
1940
- 1940-09-27 DE DED6648D patent/DE880720C/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0586912A2 (en) * | 1992-09-08 | 1994-03-16 | MAN Nutzfahrzeuge Aktiengesellschaft | Spray nozzle |
EP0586912A3 (en) * | 1992-09-08 | 1994-11-30 | Man Nutzfahrzeuge Ag | Spray nozzle. |
WO1995021028A1 (en) * | 1994-02-07 | 1995-08-10 | Linssen Johannes Joseph Gerard | Method for applying material to a substrate and apparatus for the implementation of the method |
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