WO2017017034A1 - Method for treating surfaces by means of a blasting medium consisting of dry ice particles - Google Patents

Method for treating surfaces by means of a blasting medium consisting of dry ice particles Download PDF

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Publication number
WO2017017034A1
WO2017017034A1 PCT/EP2016/067585 EP2016067585W WO2017017034A1 WO 2017017034 A1 WO2017017034 A1 WO 2017017034A1 EP 2016067585 W EP2016067585 W EP 2016067585W WO 2017017034 A1 WO2017017034 A1 WO 2017017034A1
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WIPO (PCT)
Prior art keywords
carbon dioxide
blasting
dry ice
ice particles
particles
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PCT/EP2016/067585
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German (de)
French (fr)
Inventor
Thomas Böckler
Friedhelm Herzog
Andreas Donnerhack
Steven Powell
Original Assignee
Messer Group Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Messer Group Gmbh filed Critical Messer Group Gmbh
Priority to EP16745089.9A priority Critical patent/EP3325215A1/en
Publication of WO2017017034A1 publication Critical patent/WO2017017034A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/003—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods using material which dissolves or changes phase after the treatment, e.g. ice, CO2
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/06—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for producing matt surfaces, e.g. on plastic materials, on glass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/32—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks
    • B24C3/322—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks for electrical components
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/50—Carbon dioxide
    • C01B32/55—Solidifying

Definitions

  • the invention relates to a method for treating surfaces with a blasting agent of dry ice particles.
  • the irradiation of the surfaces with a blasting abrasive is an alternative to mechanical treatments such as grinding or brushing.
  • a blasting abrasive is an alternative to mechanical treatments such as grinding or brushing.
  • abrasive blasting agents such as sand, glass, corundum or plastic granules
  • non-abrasive blasting agents such as carbon dioxide snow or
  • Carbon dioxide pellets differentiated.
  • abrasive is here to be understood as an effect on a surface, which leads to a material removal from the treated surface, in particular to a roughening of the treated surface.
  • the treated with abrasive blasting materials have - in contrast to those treated with non-abrasive abrasives - roughened after treatment surface, so characterized by a material removal surface.
  • a treatment with abrasive abrasives is therefore particularly suitable to
  • Pre-treat surfaces for subsequent processing for example, for a paint or a coating.
  • the main disadvantage of conventional abrasive blasting agents is that the particles of the blasting medium occurring during the irradiation are carried off and contaminate the irradiated one
  • a ceramic surface treated with sandblasting has silicon carbide grains which, in particular, can break out under mechanical stress. Therefore, sandblasted ceramic surfaces are not currently under clean room conditions, as required especially in the semiconductor industry be used.
  • the break-out of particles, such as the mentioned silicon carbide particles constitutes a contamination that deleteriously interferes with the production processes for the production of semiconductor products and leads to errors in the product to be manufactured.
  • the risk of contamination by the use of abrasive blasting agents is also given, for example, in various applications in the food, medical and automotive sectors.
  • Blasting agent is used carbon dioxide in the form of snow or pellets.
  • Carbon dioxide snow is obtained by expansion of liquid carbon dioxide at a decompression nozzle and in its use as a blasting medium often radiated directly from the expansion nozzle at high speed, up to supersonic speed, on the surface to be treated.
  • the irradiation with carbon dioxide snow is particularly suitable for the removal of coatings and coatings of pressure-sensitive surfaces.
  • Carbon dioxide pellets are granules of carbon dioxide particles which are discharged in a carrier gas stream, usually compressed air, from a jet nozzle arranged in a jet gun onto the surface to be processed.
  • a carrier gas stream usually compressed air
  • liquid carbon dioxide is converted by relaxation into carbon dioxide snow. This is compressed into a cake and pressed through a die.
  • cylindrical or spherical particles with a certain distribution of length and diameter;
  • the pellets typically, the pellets have a length between 5 to 10 mm and a diameter of 2 to 5 mm.
  • Carbon dioxide pellets therefore have an abrasive effect only on very soft surfaces; However, they have prevailed as a steel agent in the removal of surface-adhering coatings or contaminants, such as the Entlackung of
  • the effect of the carbon dioxide particles is based primarily on the cooling effect of the particle striking the surface at a temperature of -78.5 ° C., which leads to tensions within a coating resting on the surface and thus dissolves it from the substrate.
  • the mechanical effect of the particles on the surface which makes up the essential effect of abrasive blasting, plays only a minor role in carbon dioxide blasting due to the low hardness of the blasting particles. Consequently, the common methods for
  • Carbon dioxide surface treatment in particular, not suitable for treatment of metal or plastic workpieces where roughening of the treated surface is required.
  • the object of the present invention is therefore to specify a method for the treatment of surfaces, in particular for the abrasive treatment of workpiece surfaces, in which no carryover of blasting agent occurs.
  • the inventive method for treating surfaces with a blasting agent of dry ice particles is thus characterized in that the Blasting agent used dry ice particles are made from a solid carbon dioxide generated by freezing of liquid carbon dioxide solid carbon dioxide.
  • liquid carbon dioxide is introduced into a pressure-resistant reactor where it is brought into thermal contact with a heat transfer fluid in a still liquid state in a heat exchanger located in the reactor, the temperature of which is below the solidification temperature of carbon dioxide. Due to the thermal contact with the heat transfer fluid, the liquid carbon dioxide freezes to form a body of solid carbon dioxide. Preferably, no pressure is applied at any time during the treatment which is higher than the pressure of the liquid carbon dioxide when it is introduced into the reactor.
  • the solid carbon dioxide produced in this way is of vitreous form and has a considerably greater hardness and brittleness than carbon dioxide snow produced by relaxation of liquid carbon dioxide or carbon dioxide pellets produced therefrom.
  • the shaped body is then comminuted mechanically, for example by grinding or crushing, to form a blasting medium of the desired average grain size of, for example, 1 mm to 5 mm. Breaking or grinding results in particles with a sharp-edged surface contour, which still supports the abrasive action of the particles in use.
  • the dry ice particles produced according to the invention are particularly suitable for the abrasive surface treatment of metal or plastic surfaces, for example surfaces of aluminum, iron, steel, polyethylene, PVC or composite materials.
  • the blasting agent is discharged in a known manner in a carrier gas jet to a surface to be treated.
  • a carrier gas for example
  • Compressed air or a pressurized gas such as nitrogen or carbon dioxide gas used.
  • Dry ice particles are subcooled before irradiation of the surface. This ensures that the particles of the abrasive do not already sublime completely or partially before reaching the surface to be irradiated.
  • Supercooling is achieved by storing the particles before irradiation at a temperature below the sublimation temperature of the particles, and / or by discharging the particles in a carrier gas stream whose temperature is below the sublimation temperature.
  • the dry ice particles used as blasting agents are particularly suitable for roughening a surface, in particular a metal or plastic surface, as a pre-treatment before painting or coating. Due to their high hardness, the carbon dioxide particles produced according to the invention have an abrasive effect which is not substantially inferior to that of conventional abrasive blasting abrasives, such as, for example, glass or plastic granules. In addition, they succeed in removing coatings from surfaces which can not be removed with conventionally produced dry ice snow or dry ice pellets or only with considerable expenditure of energy and / or blasting agent.
  • dry ice particles obtained by comminuting a shaped article produced by freezing liquid carbon dioxide are solid
  • Carbon dioxide were obtained, preferably as a blasting abrasive
  • the dry ice particles prepared according to the invention combine the advantages of conventional abrasive blasting agents with those of conventionally obtained carbon dioxide particles.

Abstract

Surfaces must be partially roughened before being painted and coated. This usually is done by blasting the surface with sand or glass particles. In this type of pre-treatment sand or other blasting medium accumulates and can contaminate the part to be cleaned. In particular in the food, automotive, and medical sectors, entrainment of blasting medium is undesirable. According to the invention, during the treatment of surfaces a blasting material is used which consists of solid carbon dioxide obtained by freezing of liquid carbon dioxide. In this way a residue-free sublimating blasting medium is attained. By comparison with dry ice particles which have been produced by compression of carbon dioxide snow, the blasting medium according to the invention has a significantly higher hardness and ensures a substantially greater mechanical abrasion of the treated surface.

Description

Verfahren zum Behandeln von Oberflächen mit einem Strahlmittel aus  Process for treating surfaces with a blasting medium
Trockeneispartikeln  dry ice particles
Die Erfindung betrifft ein Verfahren zum Behandeln von Oberflächen mit einem Strahlmittel aus Trockeneispartikeln. The invention relates to a method for treating surfaces with a blasting agent of dry ice particles.
Zum Reinigen, Aktivieren oder Vorbehandeln von Werkstückoberflächen, For cleaning, activating or pretreating workpiece surfaces,
insbesondere von Maschinen, Anlagen oder Bauteilen, ist die Bestrahlung der Oberflächen mit einem Strahlmittel eine Alternative zu mechanischen Behandlungen wie beispielsweise Schleifen oder Bürsten. Dabei wird ein in der Regel aus festen Partikeln bestehendes Strahlmittel in einem Trägergasstrom mit hoher In particular of machinery, equipment or components, the irradiation of the surfaces with a blasting abrasive is an alternative to mechanical treatments such as grinding or brushing. Here is a usually consisting of solid particles blasting agent in a carrier gas stream with high
Geschwindigkeit auf die zu behandelnde Oberfläche abgestrahlt. Speed radiated to the surface to be treated.
Bei den Strahlmitteln wird zwischen sogenannten abrasiven Strahlmitteln, wie beispielsweise Sand, Glas, Korund oder Kunststoffgranulat, und sogenannten nicht- abrasiven Strahlmitteln, wie beispielsweise Kohlendioxidschnee oder In the blasting abrasive is between so-called abrasive blasting agents, such as sand, glass, corundum or plastic granules, and so-called non-abrasive blasting agents, such as carbon dioxide snow or
Kohlendioxidpellets, unterschieden. Als„abrasiv" soll hier eine Einwirkung auf eine Oberfläche verstanden werden, die zu einem Werkstoffabtrag von der behandelten Oberfläche, insbesondere zu einem Aufrauen der behandelten Oberfläche führt. Carbon dioxide pellets, differentiated. As "abrasive" is here to be understood as an effect on a surface, which leads to a material removal from the treated surface, in particular to a roughening of the treated surface.
Die mit abrasiven Strahlmitteln behandelten Werkstücke weisen - im Gegensatz zu den mit nicht-abrasiven Strahlmitteln behandelten - eine nach der Behandlung aufgeraute, also durch einen Werkstoffabtrag gekennzeichnete Oberfläche auf. Eine Behandlung mit abrasiven Strahlmitteln ist daher besonders geeignet, um The treated with abrasive blasting materials have - in contrast to those treated with non-abrasive abrasives - roughened after treatment surface, so characterized by a material removal surface. A treatment with abrasive abrasives is therefore particularly suitable to
Oberflächen für eine nachfolgende Bearbeitung, beispielsweise für eine Lackierung oder einer Beschichtung, vorzubehandeln. Der wesentliche Nachteil von üblichen abrasiven Strahlmitteln ist jedoch, dass die bei der Bestrahlung anfallenden Partikel des Strahlmittels verschleppt werden und zur Kontamination des bestrahlten Pre-treat surfaces for subsequent processing, for example, for a paint or a coating. The main disadvantage of conventional abrasive blasting agents, however, is that the particles of the blasting medium occurring during the irradiation are carried off and contaminate the irradiated one
Werkstücks führen können. Workpiece can lead.
Beispielsweise weist eine mit Sandstrahlung behandelte keramische Oberfläche Siliciumcarbid-Körner auf, die insbesondere bei mechanischer Beanspruchung herausbrechen können. Daher sind sandgestrahlte Keramikoberflächen zurzeit nicht unter Reinraumbedingungen, wie sie insbesondere in der Halbleiterindustrie verlangt werden, einsetzbar. Insbesondere für die Lithographie, etwa für die EUV- Lithographie, stellt das Ausbrechen von Partikeln, wie beispielsweise der erwähnten Siliciumcarbid-Partikel, eine Kontamination dar, die die Produktionsprozesse zur Herstellung von Halbleiterprodukten empfindlich stört und zu Fehlern im zu fertigenden Produkt führt. Die Gefahr der Kontaminationen durch Verwendung abrasiver Strahlmittel ist auch beispielsweise in verschiedenen Anwendungen im Lebensmittel-, Medizin- und Automotivbereich gegeben. For example, a ceramic surface treated with sandblasting has silicon carbide grains which, in particular, can break out under mechanical stress. Therefore, sandblasted ceramic surfaces are not currently under clean room conditions, as required especially in the semiconductor industry be used. Especially for lithography, such as for EUV lithography, the break-out of particles, such as the mentioned silicon carbide particles, constitutes a contamination that deleteriously interferes with the production processes for the production of semiconductor products and leads to errors in the product to be manufactured. The risk of contamination by the use of abrasive blasting agents is also given, for example, in various applications in the food, medical and automotive sectors.
Im Gegensatz zu den vorgenannten abrasiven Strahlmitteln sublimiert als Strahlgut verwendetes Kohlendioxid rückstandsfrei von der Werkstückoberfläche. Als In contrast to the abovementioned abrasive blasting abrasives, carbon dioxide used as blasting material sublimates without residue from the workpiece surface. When
Strahlmittel wird dabei Kohlendioxid in Form von Schnee oder Pellets eingesetzt. Blasting agent is used carbon dioxide in the form of snow or pellets.
Kohlendioxidschnee wird durch Entspannung von flüssigem Kohlendioxid an einer Entspannungsdüse gewonnen und in seinem Einsatz als Strahlmittel oft direkt aus der Entspannungsdüse mit hoher Geschwindigkeit, bis hin zur Überschallgeschwindigkeit, auf die zu behandelnde Oberfläche abgestrahlt. Die Bestrahlung mit Kohlendioxidschnee eignet sich insbesondere zur Entfernung von Belägen und Beschichtungen von druckempfindlichen Oberflächen. Carbon dioxide snow is obtained by expansion of liquid carbon dioxide at a decompression nozzle and in its use as a blasting medium often radiated directly from the expansion nozzle at high speed, up to supersonic speed, on the surface to be treated. The irradiation with carbon dioxide snow is particularly suitable for the removal of coatings and coatings of pressure-sensitive surfaces.
Bei Kohlendioxidpellets handelt es sich um ein Granulat aus Kohlendioxidpartikeln, das in einem Trägergasstrom, meist Pressluft, aus einer in einer Strahlpistole angeordneten Strahldüse auf die zu bearbeitende Oberfläche ausgetragen wird. Zur Herstellung der Kohlendioxidpellets wird flüssiges Kohlendioxid durch Entspannung in Kohlendioxidschnee überführt. Dieser wird zu einem Kuchen komprimiert und durch eine Matrize gepresst. Als Resultat entstehen zylindrische oder kugelförmige Partikel mit einer gewissen Verteilung an Länge und Durchmesser; typischerweise besitzen die Pellets eine Länge zwischen 5 bis 10 mm und einen Durchmesser von 2 bis 5 mm. Die Trockeneispellets besitzen einen Härtewert (nach Leeb) von lediglich etwa HL=180, was ungefähr der Härte von Gips entspricht. Kohlendioxidpellets wirken daher nur bei sehr weichen Oberflächen abrasiv; sie haben sich allerdings als Stahlmittel bei der Entfernung von auf Oberflächen anhaftenden Beschichtungen oder Verunreinigungen durchgesetzt, wie beispielswiese der Entlackung von Carbon dioxide pellets are granules of carbon dioxide particles which are discharged in a carrier gas stream, usually compressed air, from a jet nozzle arranged in a jet gun onto the surface to be processed. To produce the carbon dioxide pellets, liquid carbon dioxide is converted by relaxation into carbon dioxide snow. This is compressed into a cake and pressed through a die. As a result arise cylindrical or spherical particles with a certain distribution of length and diameter; Typically, the pellets have a length between 5 to 10 mm and a diameter of 2 to 5 mm. The dry ice pellets have a hardness value (according to Leeb) of only about HL = 180, which roughly corresponds to the hardness of gypsum. Carbon dioxide pellets therefore have an abrasive effect only on very soft surfaces; However, they have prevailed as a steel agent in the removal of surface-adhering coatings or contaminants, such as the Entlackung of
Metalloberflächen, der Fassadenreinigung oder dem Beseitigen grober Metal surfaces, facade cleaning or eliminating coarse
Verschmutzungen an Maschinen. Vorrichtungen und Verfahren zum Behandeln von Oberflächen mit CO2- Schneestrahlen oder Trockeneispellets wurden vielfach beschrieben und finden sich beispielsweise in den Druckschriften WO 99/043470 A, WO 00/74897 A1 , Dirt on machines. Devices and methods for treating surfaces with CO 2 snow jets or dry ice pellets have been described many times and can be found, for example, in the publications WO 99/043470 A, WO 00/74897 A1, US Pat.
WO2004/033154 A1 , DE 199 26 1 19 A1 , DE 10 2005 054 246, US 5 445 553 A, US 4 962 891 A1 , US 5 61 6 067 A1 . WO2004 / 033154 A1, DE 199 26 1 19 A1, DE 10 2005 054 246, US Pat. No. 5,445,553 A, US Pat. No. 4,962,891 A1, US Pat. No. 5,661,667 A1.
Die Wirkung der Kohlendioxidpartikel beruht vorwiegend auf dem Kälteeffekt der mit einer Temperatur von -78,5°C auf die Oberfläche auftreffenden Teilchen, der zu Spannungen innerhalb einer auf der Oberfläche aufliegenden Beschichtung führt und diese dadurch vom Untergrund löst. Die mechanische Einwirkung der Partikel auf die Oberfläche, die die wesentliche Wirkung der abrasiven Strahlgüter ausmacht, spielt bei Kohlendioxidstrahlen aufgrund der geringen Härte der Strahlpartikel nur eine untergeordnete Rolle. Demzufolge sind die gängigen Verfahren zur The effect of the carbon dioxide particles is based primarily on the cooling effect of the particle striking the surface at a temperature of -78.5 ° C., which leads to tensions within a coating resting on the surface and thus dissolves it from the substrate. The mechanical effect of the particles on the surface, which makes up the essential effect of abrasive blasting, plays only a minor role in carbon dioxide blasting due to the low hardness of the blasting particles. Consequently, the common methods for
Oberflächenbehandlung mit Kohlendioxid insbesondere nicht für eine Behandlung von Werkstücken aus Metall oder Kunststoff geeignet, bei denen ein Anrauen der behandelten Oberfläche erforderlich ist. Carbon dioxide surface treatment, in particular, not suitable for treatment of metal or plastic workpieces where roughening of the treated surface is required.
Verschiedentlich wurde daher versucht, die Vorteile von abrasiven Strahlmitteln mit denen von Kohlendioxid dadurch zu verbinden, dass ein oder mehrere mineralische Strahlmittel zusammen mit Kohlendioxidpartikeln in einem Trägergasstrom auf eine Oberfläche ausgetragen werden. Ein solches Verfahren wird beispielsweise in der DE 10 2012 017 906 A1 beschrieben. Auch wenn die Reinigungswirkung dadurch verbessert werden kann, ergibt sich jedoch auch hier das Problem der Various attempts have therefore been made to combine the advantages of abrasive blasting agents with those of carbon dioxide in that one or more mineral blasting agents are discharged together with carbon dioxide particles in a carrier gas stream on a surface. Such a method is described for example in DE 10 2012 017 906 A1. Even if the cleaning effect can be improved by this, however, the problem arises here as well
Verschleppung von Strahlmittel. Carryover of blasting media.
Aufgabe der vorliegenden Erfindung ist daher, ein Verfahren zur Behandlung von Oberflächen, insbesondere zur abrasiven Behandlung von Werkstückoberflächen, anzugeben, bei dem keine Verschleppung von Strahlmittel auftritt. The object of the present invention is therefore to specify a method for the treatment of surfaces, in particular for the abrasive treatment of workpiece surfaces, in which no carryover of blasting agent occurs.
Diese Aufgabe wird durch ein Verfahren mit den Merkmalen des Patentanspruchs 1 gelöst. Vorteilhafte Ausgestaltungen sind in den Unteransprüchen angegeben. This object is achieved by a method having the features of patent claim 1. Advantageous embodiments are specified in the subclaims.
Das erfindungsgemäße Verfahren zum Behandeln von Oberflächen mit einem Strahlmittel aus Trockeneispartikeln ist also dadurch gekennzeichnet, dass die als Strahlmittel verwendeten Trockeneispartikel aus einem durch Einfrieren von flüssigem Kohlendioxid erzeugten Formkörper aus festem Kohlendioxid hergestellt werden. The inventive method for treating surfaces with a blasting agent of dry ice particles is thus characterized in that the Blasting agent used dry ice particles are made from a solid carbon dioxide generated by freezing of liquid carbon dioxide solid carbon dioxide.
Zur Herstellung der Trockeneispartikel wird flüssiges Kohlendioxid in einen druckfesten Reaktor gefüllt und dort im weiterhin flüssigen Zustand an einem im Reaktor befindlichen Wärmetauscher mit einem Wärmeträgerfluid in thermischen Kontakt gebracht, dessen Temperatur unterhalb der Erstarrungstemperatur von Kohlendioxid liegt. Durch den Wärmekontakt mit dem Wärmeträgerfluid gefriert das flüssige Kohlendioxid zu einem Formkörper aus festem Kohlendioxid. Bevorzugt wird während der Behandlung zu keinem Zeitpunkt ein Druck angelegt, der höher als der Druck des flüssigen Kohlendioxids beim Einfüllen in den Reaktor ist. Das auf diese Weise hergestellte feste Kohlendioxid ist von glasartiger Gestalt und besitzt eine erheblich größere Härte und Sprödigkeit als durch Entspannung von flüssigem Kohlendioxid erzeugter Kohlendioxidschnee oder hieraus erzeugte Kohlendioxidpellets. Der Formkörper wird anschließend mechanisch, beispielsweise durch Zermahlen oder Brechen, zu einem Strahlmittel der gewünschten durchschnittlichen Korngröße von beispielsweise 1 mm bis 5 mm zerkleinert. Durch Brechen oder Zermahlen entstehen Partikel mit einer scharfkantigen Oberflächenkontur, durch welche die abrasive Wirkung der Partikel im Einsatz noch unterstützt wird. To produce the dry ice particles, liquid carbon dioxide is introduced into a pressure-resistant reactor where it is brought into thermal contact with a heat transfer fluid in a still liquid state in a heat exchanger located in the reactor, the temperature of which is below the solidification temperature of carbon dioxide. Due to the thermal contact with the heat transfer fluid, the liquid carbon dioxide freezes to form a body of solid carbon dioxide. Preferably, no pressure is applied at any time during the treatment which is higher than the pressure of the liquid carbon dioxide when it is introduced into the reactor. The solid carbon dioxide produced in this way is of vitreous form and has a considerably greater hardness and brittleness than carbon dioxide snow produced by relaxation of liquid carbon dioxide or carbon dioxide pellets produced therefrom. The shaped body is then comminuted mechanically, for example by grinding or crushing, to form a blasting medium of the desired average grain size of, for example, 1 mm to 5 mm. Breaking or grinding results in particles with a sharp-edged surface contour, which still supports the abrasive action of the particles in use.
Die beim erfindungsgemäßen Verfahren als Strahlmittel eingesetzten The used in the process according to the invention as a blasting agent
Trockeneispartikel besitzen mit einem gemessenen Härtewert (nach Leeb) von beispielsweise HL=400 bis HL=420 und darüber eine ähnlich große Härte wie bekannte abrasive Strahlmittel, sublimiert jedoch rückstandsfrei von einer With a measured hardness value (according to Leeb) of, for example, HL = 400 to HL = 420 and above, dry ice particles have a similar hardness as known abrasive blasting agents, but sublimate without leaving any residue
behandelten Oberfläche. Somit wird ein Verschleppen von Strahlmittel und eine dadurch verursachte Kontamination der behandelten Oberfläche wirksam treated surface. Thus, carrying over of blasting agent and thereby causing contamination of the treated surface becomes effective
unterbunden. Auf diese Weise können Insbesondere von der Halbleiterindustrie geforderte Reinraumbedingen erfüllt werden. Die erfindungsgemäß hergestellten Trockeneispartikel sind insbesondere zur abrasiven Oberflächenbehandlung von Metall- oder Kunststoffoberflächen, beispielsweise Oberflächen aus Aluminium, Eisen, Stahl, Polyethylen, PVC oder Verbundwerkstoffen geeignet. Das Strahlmittel wird in bekannter Weise in einem Trägergasstrahl auf eine zu behandelnde Oberfläche ausgetragen. Als Trägergas kommt beispielsweise prevented. In this way, in particular, clean room conditions required by the semiconductor industry can be met. The dry ice particles produced according to the invention are particularly suitable for the abrasive surface treatment of metal or plastic surfaces, for example surfaces of aluminum, iron, steel, polyethylene, PVC or composite materials. The blasting agent is discharged in a known manner in a carrier gas jet to a surface to be treated. As a carrier gas, for example
Druckluft oder ein unter Druck stehendes Gas, beispielsweise Stickstoff oder Kohlendioxidgas zum Einsatz. Compressed air or a pressurized gas, such as nitrogen or carbon dioxide gas used.
Eine besonders vorteilhafte Ausgestaltung der Erfindung sieht vor, dass die A particularly advantageous embodiment of the invention provides that the
Trockeneispartikel vor der Bestrahlung der Oberfläche unterkühlt werden. Dadurch wird gewährleistet, dass die Partikel des Strahlmittels nicht bereits ganz oder teilweise vor Erreichen der zu bestrahlenden Oberfläche sublimieren. Die Dry ice particles are subcooled before irradiation of the surface. This ensures that the particles of the abrasive do not already sublime completely or partially before reaching the surface to be irradiated. The
Unterkühlung wird dadurch erzielt, dass die Partikel vor der Bestrahlung bei einer Temperatur unterhalb der Sublimationstemperatur der Partikel bevorratet werden, und/oder dass die Partikel in einem Trägergasstrom ausgetragen werden, dessen Temperatur unterhalb der Sublimationstemperatur liegt. Supercooling is achieved by storing the particles before irradiation at a temperature below the sublimation temperature of the particles, and / or by discharging the particles in a carrier gas stream whose temperature is below the sublimation temperature.
Die als Strahlmittel verwendeten Trockeneispartikel eignen sich besonders zum Anrauen einer Oberfläche, insbesondere einer Metall- oder Kunststoffoberfläche, als Vorbehandlung vor einer Lackierung oder Beschichtung. Aufgrund ihrer großen Härte besitzen die erfindungsgemäß hergestellten Kohlendioxidpartikel eine abrasive Wirkung, die dem von konventionellen abrasiven Strahlmitteln, wie beispielsweise Glas oder Kunststoffgranulat, nicht wesentlich nachsteht. Zudem gelingt es mit ihnen, Beschichtungen von Oberflächen zu entfernen, die mit konventionell hergestelltem Trockeneisschnee oder Trockeneispellets nicht oder nur mit erheblichem Aufwand an Energie und/oder Strahlmittel entfernt werden können. The dry ice particles used as blasting agents are particularly suitable for roughening a surface, in particular a metal or plastic surface, as a pre-treatment before painting or coating. Due to their high hardness, the carbon dioxide particles produced according to the invention have an abrasive effect which is not substantially inferior to that of conventional abrasive blasting abrasives, such as, for example, glass or plastic granules. In addition, they succeed in removing coatings from surfaces which can not be removed with conventionally produced dry ice snow or dry ice pellets or only with considerable expenditure of energy and / or blasting agent.
Erfindungsgemäß werden Trockeneisteilchen, die durch Zerkleinern eines durch Einfrieren von flüssigem Kohlendioxid hergestellten Formkörpers aus festem According to the invention, dry ice particles obtained by comminuting a shaped article produced by freezing liquid carbon dioxide are solid
Kohlendioxid gewonnen wurden, bevorzugt als Strahlmittel zur abrasiven Carbon dioxide were obtained, preferably as a blasting abrasive
Behandlung von Oberflächen, beispielsweise zum Anrauen von Oberflächen aus Metall oder Kunststoff vor einer nachfolgenden Bearbeitung, eingesetzt. Die erfindungsgemäß hergestellten Trockeneisteilchen verbinden aufgrund ihrer großen Härte und dem Umstand, dass sie rückstandsfrei von einer behandelten Oberfläche sublimieren, die Vorzüge konventioneller abrasiver Strahlmittel mit denen von konventionell gewonnenen Kohlendioxidpartikeln. Treatment of surfaces, for example, for roughening surfaces of metal or plastic before subsequent processing used. Due to their high hardness and the fact that they sublime residue-free from a treated surface, the dry ice particles prepared according to the invention combine the advantages of conventional abrasive blasting agents with those of conventionally obtained carbon dioxide particles.

Claims

Patentansprüche claims
1 . Verfahren zum Behandeln von Oberflächen mit einem Strahlmittel aus 1 . Process for treating surfaces with a blasting medium
Trockeneispartikeln,  Dry ice particles,
dadurch gekennzeichnet,  characterized,
dass die als Strahlmittel verwendeten Trockeneispartikel aus einem durch Einfrieren von flüssigem Kohlendioxid erzeugten Formkörper aus festem Kohlendioxid hergestellt werden.  that the dry ice particles used as blasting agents are produced from a solid carbon dioxide shaped body produced by freezing of liquid carbon dioxide.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die als Strahlmittel verwendeten Trockeneispartikel vor der Bestrahlung der Oberfläche unterkühlt werden. 2. The method according to claim 1, characterized in that the dry ice particles used as blasting agents are subcooled before the irradiation of the surface.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, das die als 3. The method according to claim 1 or 2, characterized in that the
Strahlmittel verwendeten Trockeneispartikel zum Anrauen einer Oberfläche als Vorbehandlung vor einer Lackierung oder Beschichtung eingesetzt werden.  Used blasting abrasive dry ice particles for roughening a surface as a pre-treatment before painting or coating.
4. Verwendung von Trockeneispartikeln, die aus einem durch Einfrieren von 4. Use of dry ice particles from a freeze
flüssigem Kohlendioxid erzeugten festen Kohlendioxid-Formkörper hergestellt wurden, zur abrasiven Behandlung von Oberflächen.  liquid carbon dioxide produced solid carbon dioxide moldings were prepared for the abrasive treatment of surfaces.
PCT/EP2016/067585 2015-07-25 2016-07-22 Method for treating surfaces by means of a blasting medium consisting of dry ice particles WO2017017034A1 (en)

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DE102015009676.1A DE102015009676A1 (en) 2015-07-25 2015-07-25 Process for treating surfaces with a dry ice blasting abrasive
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