WO2012087227A1 - Procédé de prétraitement d'objets en matière plastique avant revêtement - Google Patents

Procédé de prétraitement d'objets en matière plastique avant revêtement Download PDF

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Publication number
WO2012087227A1
WO2012087227A1 PCT/SE2011/051525 SE2011051525W WO2012087227A1 WO 2012087227 A1 WO2012087227 A1 WO 2012087227A1 SE 2011051525 W SE2011051525 W SE 2011051525W WO 2012087227 A1 WO2012087227 A1 WO 2012087227A1
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WO
WIPO (PCT)
Prior art keywords
chamber
chambers
microemulsion
specific surface
coating
Prior art date
Application number
PCT/SE2011/051525
Other languages
English (en)
Inventor
Owe Larsson
Romain BORDES
Original Assignee
MAGU E-Systems AB
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 MAGU E-Systems AB filed Critical MAGU E-Systems AB
Priority to EP11850874.6A priority Critical patent/EP2654975A4/fr
Publication of WO2012087227A1 publication Critical patent/WO2012087227A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/18—Hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D17/00—Detergent materials or soaps characterised by their shape or physical properties
    • C11D17/0008—Detergent materials or soaps characterised by their shape or physical properties aqueous liquid non soap compositions
    • C11D17/0017—Multi-phase liquid compositions
    • C11D17/0021—Aqueous microemulsions
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/20—Organic compounds containing oxygen
    • C11D3/2003—Alcohols; Phenols
    • C11D3/2006—Monohydric alcohols
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/20—Organic compounds containing oxygen
    • C11D3/2093—Esters; Carbonates
    • 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
    • B05D3/0486—Operating the coating or treatment in a controlled atmosphere
    • 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
    • B05D3/10—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 other chemical means
    • B05D3/101—Pretreatment of polymeric substrate
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
    • C11D2111/10—Objects to be cleaned
    • C11D2111/14—Hard surfaces
    • C11D2111/18—Glass; Plastics

Definitions

  • the present invention relates to the field of coating objects. More specifically, the invention relates to a method for continuously cleaning and pre-treating objects made of plastic materials and/or metallic materials followed by a coating step. The invention also provides a system designed for carrying our said method. Finally, the invention provides a specific cleaning preparation to be used in the initial pre-treatment step and in the total coating process.
  • Plastic parts or objects are typically manufactured in several steps.
  • the first step comprises moulding or extrusion of the plastic object by any known plastic injection method
  • the second step comprises lacquering of the object by any generally known method
  • the third step comprises any generally known printing method.
  • plastic and/or metallic parts are typically manufactured in several steps.
  • the first step comprises moulding by any known method.
  • the product is packed on tape on reel, in container, or any other known packaging method after moulding.
  • the parts are then moved to the next station which is directed to surface treatment where the parts could be treated by any known method such as plasma treatment, and/or lacquering and/or decoration of the parts.
  • Products that are handled in free atmosphere are exposed to contamination due to logistic processes before surface treatment. They may accordingly be exposed to dust, fibres, protein, bacteria, hair, etc.
  • the product itself is typically electrically loaded due to friction etc, which increases adhesion of contaminating objects and compounds.
  • There are different methods in use for cleaning of surfaces. Examples of devices and methods in use are carbon fibre brushes, cupper wires, antistatic polarisation equipment, dry cleaning including surfactants, and blasting with fluids, ice crystals or sand. US 6030663, US 6200943, US 6297206,
  • Contamination before coating causes reject of finished parts for estetical reasons (for example loss of coating, uneven surface, etc.), optical reasons (for example lenses and displays are not transparent and/or does not have specified optical characteristics) and functional reasons (for example not specified isolation characteristics leading to battery and electricity problems).
  • estetical reasons for example loss of coating, uneven surface, etc.
  • optical reasons for example lenses and displays are not transparent and/or does not have specified optical characteristics
  • functional reasons for example not specified isolation characteristics leading to battery and electricity problems.
  • the plastics objects are conventionally lacquered in an open spray system, a dip system, Inmould labeling or Inmould Decoration Moulding system. These systems are open to the atmosphere. During the spray lacquering process, over-spray of paint occur. Such over-spray of paint constitutes an
  • WO 03/049929 a single tool for injection moulding as well as painting of an object is disclosed.
  • an injection moulding station the object is moulded between a turnable mould part and a stationary mould part.
  • the turnable mould part with the object is rotated 90° to another station where paint is applied to the object, with the object still placed on the turnable mould part.
  • the paint applied to the object is UV hardened and then the object is ejected from the turnable mould part.
  • the turnable mould part is rotated back to the injection moulding station to start the cycle again.
  • the advantage of the system of WO 03/049929 is that there is only one machine for production and painting of the plastic object without the need to transport the object from an injection moulding machine.
  • the injection moulding step is essentially faster than the painting and hardening step.
  • cycle times are expanded and productivity reduced.
  • the turnable movable part might be contaminated with paint and thus has to be cleaned from time to time in order to avoid damages of the objects during the injection moulding step.
  • WO 2005/075170 discloses a system for producing and coating an object, comprising a manufacturing machine and an object treatment device wherein said object treatment device comprises a painting station with means for applying a coating to a surface of said object, at least another station for treating said object and a conveyor which allows said object to move between the stations. Most stations (except the loading station) are typically located within an enclosure comprising means for creating a controlled atmosphere. Accordingly, the system of WO 2005/075170 is more efficient compared to the disclosure of WO 03/049929.
  • the present invention provides a method for producing and coating a specific surface of moulded plastic object, comprising the steps of: a) producing said object in a manufacturing machine according to per se known methods;
  • transferring said object into and through a tunnel comprising at least three, optionally four or five consecutive partially separated chambers in the direction A to E, where chambers A and E each comprises an opening to the surroundings, the consecutive chambers of the tunnel having a controlled atmosphere obtained by injection, said injection of controlled atmosphere being set up in such a way that the net air transport in said tunnel is directed from chamber B to A and out to the surroundings as well as from chamber E and out to the surroundings, during which transferring the object receives a treatment comprising: applying, in chamber A, a microemulsion comprising a cleaning agent to said specific surface;
  • the invention provides an apparatus for coating a surface of a moulded plastic object in accordance with the method of the first aspect, said apparatus comprising a tunnel comprising at least three, optionally four or five consecutive partially separated chambers in the direction A to E, where chambers A and E each comprises an opening to the surroundings, the consecutive chambers of the tunnel having means for achieving a controlled atmosphere obtained by injection, said injection of controlled atmosphere being set up in such a way that the net air transport in said tunnel is directed from chamber B to A and out to the surroundings as well as from chamber E and out to the surroundings,
  • said tunnel having a means for transferring a moulded plastic object to be coated from the entrance opening outside chamber A to the exit opening outside chamber E,
  • chamber A having means, such as one or more nozzles, for applying a microemulsion comprising a cleaning agent,
  • chamber B having means, such as one or more nozzles, for injecting a rinsing agent
  • optional chamber C having drying means such as a source of infrared radiation or means for injecting a drying agent, such as one or more nozzles, optional chamber D having temperature adjusting means such as heating or cooling means, and chamber E having per se known coating means.
  • drying means such as a source of infrared radiation or means for injecting a drying agent, such as one or more nozzles
  • optional chamber D having temperature adjusting means such as heating or cooling means
  • chamber E having per se known coating means.
  • the present invention provides a system for controlling an apparatus according any of claims 8 and 9, said system comprising:
  • a plurality of sensors for detecting presence and/or motion of an object to be coated
  • a plurality of sensors for detecting flow and direction of a gas stream;
  • injection means such as one or more nozzles, for injecting a rinsing agent in chamber B;
  • said plurality of sensors for detecting presence and/or motion of an object to be coated being set up to send information to the control and calculation means regarding when such an object is in a pre-determined position;
  • said plurality of sensors for detecting flow and direction of a gas stream being set up to send information to the control and calculation means regarding the gas flow in the chambers;
  • said plurality of temperature sensors being set up to send information to the control and calculation means regarding temperature in the chambers; said control and calculation means being set up to instruct said means for controlling application of a microemulsion comprising a cleaning agent in chamber A to apply said microemulsion when an object to be coated is transferred through chamber A;
  • control and calculation means being set up to instruct said means for controlling said injection means in chamber B to provide injection of said rinsing agent when an object to be coated is transferred through chamber B; optionally said control and calculation means being set up to instruct said means for controlling drying means in optional chamber C to provide drying when an object to be coated is transferred through chamber C;
  • the present invention provides a composition for cleaning a plastic surface when preparing said surface for coating and/or printing, said composition being useful in the method of the first aspect, said composition being an oil-in-water microemulsion comprising:
  • the present invention provides use of a composition according to the fourth aspect for cleaning a plastic surface when preparing said surface for coating and/or printing.
  • the present invention provides a method for producing and coating a specific surface of moulded plastic object, comprising the steps of: a) producing said object in a manufacturing machine according to per se known methods;
  • moulded plastic object relates to any kind of moulded plastic object intended to be coated such an outer cover of an electronic device such as a mobile phone, spectacle frames, or packages intended for containing cosmetics.
  • the present invention is well suited for production of coated plastic objects the surfaces of which have a high gloss.
  • the moulded plastic objects may be produced by any per se known method for producing a moulded plastic object, such as injection moulding, extrusion moulding, metal pouring or rolling mill.
  • the object is transferred through a tunnel comprising at least three and optionally four or five consecutive partially separated chambers.
  • the tunnel is arranged in an area have a controlled atmosphere such as a clean room.
  • the tunnel is also adapted for containing a controlled atmosphere.
  • Consecutive partially separated chambers is meant that the chambers are not isolated from each other or from the surroundings. Typically, they are separated by walls containing openings. These openings may in turn typically be partially sealed by air knives or slidable doors, which slidable doors may be automatic.
  • the controlled atmosphere may hence flow from one chamber to another and out into the clean room where the tunnel typically is located.
  • the net air transport in the tunnel is directed from chamber B through chamber A and out to the surroundings.
  • the tunnel comprises a chamber C and/or a chamber D the net air transport is directed from the chamber closest to chamber E, through remaining consecutive chambers and out to the surroundings through the partial opening in chamber A
  • volatile rinsing agent relates to an agent capable of removing the microemulsion comprising a cleaning agent.
  • the microemulsion typically is of the oil-in-water type, it is advantageous for cost and environmental reasons to use clean water and/or ethanol as a rinsing agent.
  • Carbon dioxide in liquid and/or gaseous form and nitrogen are two other examples of rinsing agents. Clean water is preferred.
  • chamber C as well as the drying step carried out there can be dispensed with. In that case the object to be coated is directly transferred to chamber D, in case temperature adjustment is needed, or directly to chamber E in case no temperature adjustment is needed. It is advantageous that all of the microemusion applied in chamber A is removed from the object to be coated during the rinsing step in chamber B.
  • the drying step optionally carried out in optional chamber C is typically carried out by one or more mechanisms selected from ethanol spraying, streams of air or nitrogen, heat typically produced by infrared radiation or other conventional heating sources.
  • a liquid rinsing agent is used in the rinsing step in chamber B, it is advantageous that the liquid rinsing agent is completely removed during the drying step in chamber C.
  • the temperature adjustment step optionally carried out in optional chamber D is carried out using conventional heating or cooling means. What is important to consider are the temperature requirements of the final coating step in chamber E.
  • controlled atmosphere relates to gas compositions normally used in clean rooms, for instance when manufacturing semiconductor structures. Hence, the amount of particles in the controlled atmosphere should be very low. Clean air or inert gasses such as nitrogen or argon or mixtures thereof could be used. The skilled person knows how to select a suitable controlled atmosphere for a given situation.
  • the transferring of the moulded plastic object through said tunnel comprising chambers A - E is done in such a way that no reloading is carried out during the whole transfer operation and that the specific surface is only exposed to said microemulsion comprising a cleaning agent, said volatile rinsing agent, gaseous agents and the coating
  • the object to be coated is hung under a conveyor (in case the object to be coated is to be coated from many directions).
  • the object may be hung in such a way that it can be rotated in order to further improve coating from many different directions.
  • the object can be arranged on a transporter such as a transport belt (in case the coating is to be applied from above).
  • the conveyor or transport belt typically runs through the whole tunnel and no reloading is therefore necessary.
  • the microemulsion comprising a cleaning agent that is applied in chamber A is an oil-in-water microemulsion comprising: a) 19 - 25% (wt) of a non-ionic surfactant component;
  • the non-ionic surfactant component is selected from the group of Berol 533, Berol 535, Berol 537, Berol Ox 91 -4, Berol OX 91 -6, AG6202, 2EH2PO4EO, Span 20, Span 80, Span 65, Span 85, Tween 20, Tween 80, Tween 65, Tween 85, Ethylan 1003, and Ethylan 1005.
  • the hydrophobic component is selected from the group of isopropyl myristate, Methyl octanoate, heptane and cyclohexane.
  • the volatile rinsing agent in chamber B that is capable of removing said microemulsion from said specific surface is selected from pure water, pure ethanol, nitrogen, and liquid or gaseous carbon dioxide.
  • the drying step in chamber C is carried out in a stream of air, nitrogen and/or carbon dioxide, optionally in combination with heat.
  • All chemicals used in relation to the present invention are of high, and preferably the highest commercially available quality and purity. It is especially important that the rinsing agent has a high purity.
  • the present invention provides an apparatus for coating a surface of a moulded plastic object in accordance with the method of the first aspect
  • said apparatus comprising a tunnel comprising at least three and optionally four or five consecutive partially separated chambers in the direction A to E, where chambers A and E each comprise an opening to the surroundings, the consecutive chambers of the tunnel having means for achieving a controlled atmosphere obtained by injection, said injection of controlled atmosphere being set up in such a way that the net air transport in said tunnel is directed from chamber B to A and out to the surroundings as well as from chamber E and out to the surroundings,
  • said tunnel having a means for transferring a moulded plastic object to be coated from the entrance opening outside chamber A to the exit opening outside chamber E,
  • chamber A having means, such as one or more nozzles, for applying a microemulsion comprising a cleaning agent,
  • chamber B having means, such as one or more nozzles, for injecting a rinsing agent
  • drying means such as a source of infrared radiation or means for injecting a drying agent, such as one or more nozzles,
  • means for achieving a controlled atmosphere typically relates to means for specific injection of said atmosphere in defined locations, Typically, such means could be nozzles for injecting gasses. In order to achieve the desired net transport of controlled atmosphere, such nozzles are arranged close to the opening between chambers D and E (or alternatively C and E in case chamber D is missing, or B and E in case both chambers C and D re missing). Hence an elevated pressure is obtained which initiates the gas transport.
  • the means for injecting a microemulsion comprising a cleaning agent, as well as the means for injecting a rinsing agent could be any nozzle suitable for injecting liquids, preferably aqueous liquids.
  • the nozzles are arranges in any suitable way in order to facilitate application of the microemulsion/rinsing agent.
  • any means for injecting gasses in chambers B and C are ordinary nozzles that could be arranged in any suitable way.
  • the drying means in chamber C is any suitable source of infrared radiation that is arranged in such a way that the area to be coated is efficiently dried.
  • the heating and/or cooling means of chamber E are also of standard type.
  • chambers A - E are separated by separation means selected from the group of air knives and automatic sliding doors set up to open when an object to be coated is about to pass.
  • the present invention provides a system for controlling an apparatus according any of claims 8 and 9, said system comprising:
  • a plurality of sensors for detecting presence and/or motion of an object to be coated
  • a plurality of sensors for detecting flow and direction of a gas stream;
  • injection means such as one or more nozzles, for injecting a rinsing agent in chamber B;
  • said plurality of sensors for detecting presence and/or motion of an object to be coated being set up to send information to the control and calculation means regarding when such an object is in a pre-determined position; said plurality of sensors for detecting flow and direction of a gas stream being set up to send information to the control and calculation means regarding the gas flow in the chambers;
  • said plurality of temperature sensors being set up to send information to the control and calculation means regarding temperature in the chambers; said control and calculation means being set up to instruct said means for controlling application of a microemulsion comprising a cleaning agent in chamber A to apply said microemulsion when an object to be coated is transferred through chamber A;
  • control and calculation means being set up to instruct said means for controlling said injection means in chamber B to provide injection of said rinsing agent when an object to be coated is transferred through chamber B; said control and calculation means being set up to instruct said means for controlling drying means in chamber C to provide drying when an object to be coated is transferred through chamber C;
  • control and calculation means being set up to instruct said means for controlling temperature adjusting means to provide a pre-determined temperature adjustment using data from said plurality of temperature sensors when an object to be coated is transferred through chamber D.
  • the motion sensors, sensors for detecting flow and direction of gas streams as well as different control means are all standard components. The skilled person could easily select suitable such components.
  • the control and calculation means is typically a micro-computer or a personal computer using standard interfaces.
  • the present invention provides a composition for cleaning a plastic surface when preparing said surface for coating and/or printing, said composition being useful in the method of the first aspect, said composition being an oil-in-water microemulsion comprising:
  • the non-ionic surfactant component is selected from the group of Berol 533, Berol 535, Berol 537, Berol Ox 91 -4, Berol OX 91 -6, AG6202, 2EH2PO4EO, Span 20, Span 80, Span 65, Span 85, Tween 20, Tween 80, Tween 65, Tween 85, Ethylan 1003, and Ethylan 1005.
  • non-ionic surfactants selected from the group of Berol 533, Berol 535, Berol 537, Berol Ox 91 -4, Berol OX 91 -6, AG6202, 2EH2PO4EO, Span 20, Span 80, Span 65, Span 85, Tween 20, Tween 80, Tween 65, Tween 85, Ethylan 1003, and Ethylan 1005. All these non-ionic surfactants are easy to obtail.
  • Berol 533, Berol 535, Berol 537, Berol OX 91 -4, Berol OX 91 -6, Ethylan 1003, Ethylan 1005, AG6202 and 2EH2PO4EO are all readily available from Akzo Nobel Surface Chemistry AB, SE.
  • Span 20, Span 80, Span 65, Span 85, Tween 20, Tween 80, Tween 65 and Tween 85 are all readily available from Croda International PLC. Particularly good results have been obtained for Berol 535, Berol OX 91 -4 and Berol OX 91 -6.
  • the hydrophobic component is selected from the group of isopropyl myristate, Methyl octanoate, heptane and cyclohexane.
  • the present invention provides use of a composition according to the fourth aspect, for cleaning a plastic surface when preparing said surface for coating and/or printing.
  • Figure 1 discloses an apparatus according to the second embodiment of the present invention.
  • FIG. 1 an apparatus 10 according for carrying out the method of the first aspect of the present invention is shown.
  • An object to be coated 12 is attached to a conveyor 14.
  • the conveyor 14 typically transports said object 12 through the whole apparatus 10 without any reloading operation. It is advantageous that the object 12 is hung under the conveyor 14 as it then is possible to coat the object 12 from several directions at the same time. In certain cases the object is mounted on a holder enabling rotation of the object (embodiment not shown). The holder is then transported through the tunnel by the conveyor. It is of course also possible to arrange the object 12 on top of the conveyor 14, or on a transport belt, especially if it is only desirable to coat the object 12 from above. Furthermore, irrespective of how the objects are transported through the tunnel, it is of course possible to treat more than one object at a time in a chamber of the tunnel.
  • the apparatus 10 shown in Figure 1 is a tunnel comprised of five consecutive chambers A, B, C, D and E. Chambers A and E both have partial openings 16, 18 to the surroundings outside the apparatus 10. There is a partial opening 20 between chambers A and B, a partial opening 22 between chambers B and C, a partial opening 24 between chambers C and D and a partial opening between chamber D and E. As already indicated, the term "partial opening" indicates that the openings are not completely sealed.
  • these openings 16, 18, 20, 22, 24, 26 may be partially sealed by air knives or slidable doors, which slidable doors may be automatic.
  • the controlled atmosphere may hence flow from one chamber to another and out into the clean room where the tunnel typically is located.
  • Object detectors 28, 30, 32, 34, 36, 38 monitor the presence of an object to be coated and typically sends signals to a control and calculation means 202 (only shown in Figure 2) in order to initiate door openings and/or treatment steps in the different chambers A - E.
  • Chambers A, B, C and D are all associated with pre-treatment of the surface of the object 12 to be coated.
  • Chamber E is associated with the actual coating operation.
  • the pre-treatment of the object 12 to be coated that is carried out in chamber A is application of a microemulsion comprising a cleaning agent.
  • a microemulsion comprising a cleaning agent.
  • the advantage of applying such a microemulsion is that such an emulsion is a good solvent for any kind of contamination that may be present on the surface to be coated.
  • Microemulsions that could be used in connection with the present invention will be further described later on.
  • the microemulsion is injected into chamber A from different nozzles 40.
  • the embodiment shown in Figure 1 is focused on injection of the microemulsion as such an application is very efficient. However, it is of course possible to apply the microemulsion in other ways such as dipping the object into the emulsion or pouring the emulsion over the object.
  • the pre-treatment carried out in chamber B is rinsing.
  • the rinsing step can be carried out by injecting liquid or gaseous rinsing agents through rinsing nozzles 42.
  • suitable liquid rinsing agents are clean water, ethanol or liquid carbon dioxide.
  • Suitable gaseous rinsing agents are nitrogen or gaseous carbon dioxide.
  • drying step In case a liquid rinsing agent such as water or ethanol has been used, it is advantageous to include a drying step. Typically, such a drying step is carried out in chamber C. Any suitable means for drying can be used. Typical examples of drying means are a source 44 of infrared radiation or gas streams blowing over the object 12 to be coated. In case carbon dioxide or another gaseous rinsing agent has been used in chamber B, it is not necessary to include any chamber C or the associated drying step.
  • This temperature adjustment step is carried out in chamber D and involves using means 48 for increasing the temperature as well as means 46 for reducing the temperature. Any suitable means adapted for the particular controlled atmosphere of the tunnel may be used. However, in case the object already has a suitable temperature it is also possible to exclude chamber D and the associated temperature adjustment treatment.
  • the actual coating treatment is carried out in chamber E by any suitable coating method.
  • flow 52 is associated with the pre-treatment part of the process.
  • the flow starts from nozzles 56 close to the partial opening into chamber E.
  • the apparatus 10 comprises a chamber D
  • nozzles 56 are located there.
  • nozzles 56 are located in chamber C.
  • both chambers C and D are absent, nozzles 56 are located in chamber B.
  • Nozzles 58 for starting flow 54 are always located in chamber E.
  • control system 200 for the apparatus 10 shown in Figure 1 is shown. Accordingly, the central part system 200 is a control and calculation means 202. The control and
  • calculation means 202 is typically a personal computer or a microcomputer, and receives information from a variety of sensors. Examples of such sensors that are shown in Figure 2 are a location or motion sensor 204 for detecting and monitoring position and movement of an object to be coated, gas flow detection means 206 for determining amount and direction of a gas flow and temperature sensors 212.
  • the control and calculation means 202 uses the information obtained from these sensors for controlling the apparatus 10 by sending instructions to a plurality of means, such as means 208 for controlling application of a microemulsion comprising a cleaning agent, means 210 for controlling injection of rinsing agent, means 214 for controlling drying means and means 216 for controlling temperature adjustment means.
  • the sensors and means used in the system are of standard type and any commercially available such means and sensors could be included.
  • the system renders it possible to automatize the process shown in Figure 1 . Furthermore, such a system also leads to increased efficiency and reduced environmental impact as chemicals are only injected when needed, and temperature is only adjusted when needed.
  • Another important part of the present invention is the microemulsion comprising a cleaning agent that is applied in chamber A. In order to minimize the amount of rejects it is believed that it is important to remove all
  • the cleaning water-in-oil microemulsion or oil in water composition according to the present invention affects the surface of plastic and metallic objects in such a way that adhesion is prevented.
  • Inclusion of a cleaning step using the cleaning composition of the invention before coating leads to higher productivity, higher yield but lower manufacturing costs.
  • the fact that the combined cleaning and coating process is carried out in an enclosure and in a controlled atmosphere decreases environmental problems and hazards as well as energy consumption.
  • yield increased from 69 % to 97%. The yield was measure on wear resistance (Ericsen test), optical effect (permeable for UV/visual light), surface defects per mm 2 (measured by optical equipment) and influence of adhesion in the interface between coating and substrate (steel wool test).
  • a rinsing step is carried out with a volatile rinsing agent in order to remove the microemulsion.
  • suitable rinsing agents may be pure water and ethanol as well as air, nitrogen and carbon dioxide in gaseous and supercritical form. A supercritical liquid is under such a high pressure that the border between liquid and gas has disappeared. The pressure and
  • thermodynamical critical point temperature point above which supercritical liquids are formed.
  • the density of the gas phase becomes more and more similar to the density of the liquid phase until they are indistinguishable.
  • Supercritical liquids may diffuse through solid materials as a gas but they may also dissolve other compounds as a liquid.
  • the density of a supercritical liquid may be regulated by changing temperature and/or pressure.
  • Supercritical C02 may occur at pressures above 70 bar and at temperatures above room
  • Liquid rinsing agents such as water and ethanol are removed in a separate drying step that may comprise drying by heating or by a gas flow. In case gaseous or supercritical rinsing agents are used it is possible to dispense with a separate drying step.
  • Oil-in-water microemulsions are preferred in connection with the present invention in comparison with water-in-oil microemulsions.
  • Oil-in-water microemulsions contains a
  • Plastic objects were dipped into one of the microemulsions above. Then they were immersed twice in ethanol. After each immersion, the objects were flushed with air. Finally, the objects were coated with lacquer.
  • Example 8 Pre-treatment and subsequent coating of plastic objects Surfaces of some plastic objects (10 surfaces of polycarbonate and 10 surfaces of polyamide 12, size: 100 x 35 mm, grooves in a square pattern) were processed in a tunnel comprising five consecutive chambers A - E. The following steps were carried out: Chamber A: The surfaces were each sprayed with 0.8 ml of the plastic objects.
  • microemulsion of example 7 for 1 .5 seconds at a temperature of 20°C.
  • the microemulsions were allowed to interact with the surfaces for 20 seconds.
  • Chamber B The surfaces were sprayed three times and each time during 2 seconds with totally 450 ml water at a temperature of 20°C.
  • Chamber C The surfaces were heated by infrared radiation during 140 seconds at a temperature of 40 °C.
  • Chamber D The surfaces were cooled in a controlled atmosphere comprising pure air for 180 seconds. Their temperature after cooling was 20 °C. There was a steady flow of pure air from chamber D through chambers C, B, and A out to the surroundings. The dryness of the surfaces were checked before the final coating step. Furthermore, one polycarbonate surface and one polyamide 12 surface were removed for further measurements.
  • Chamber E The surfaces were coated with an organic solvent-based lacquer and thereafter cured in a heated chamber. There was a steady flow of pure air from chamber E out to the surroundings.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Cleaning By Liquid Or Steam (AREA)

Abstract

L'invention porte sur un procédé de fabrication et de revêtement d'une surface spécifique d'un objet en matière plastique moulé, ledit procédé comportant les étapes suivantes : a) la fabrication dudit objet dans une machine de fabrication selon des procédés connus ; b) le transfert dudit objet dans et à travers un tunnel comportant au moins trois, facultativement quatre ou cinq chambres partiellement séparées, consécutives dans la direction allant de A à E, les chambres A et E comportant chacune une ouverture vers l'environnement, les chambres consécutives du tunnel ayant une atmosphère contrôlée obtenue par injection, ladite injection d'atmosphère contrôlée étant établie de manière que le transport d'air net dans ledit tunnel soit dirigé de la chambre D à la chambre A et vers l'environnement, ainsi qu'à partir de la chambre E et vers l'environnement. Pendant ledit transfert, l'objet reçoit un traitement comportant : l'application, dans une chambre A, d'une microémulsion comportant un agent de nettoyage pour ladite surface spécifique ; le rinçage, dans la chambre B, de ladite surface spécifique avec un agent de rinçage volatile pouvant éliminer ladite microémulsion de ladite surface spécifique ; le séchage facultatif, dans la chambre C, d'une manière telle que ledit agent de rinçage volatil est éliminé de ladite surface spécifique ; le réglage facultatif, dans la chambre D, de la température de ladite surface spécifique à la température de l'étape de revêtement ultérieure ; c) le transfert dudit objet en matière plastique moulé de l'une quelconque des chambres B à D à la chambre E et le revêtement de ladite surface spécifique selon des procédés connus.
PCT/SE2011/051525 2010-12-21 2011-12-16 Procédé de prétraitement d'objets en matière plastique avant revêtement WO2012087227A1 (fr)

Priority Applications (1)

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EP11850874.6A EP2654975A4 (fr) 2010-12-21 2011-12-16 Procédé de prétraitement d'objets en matière plastique avant revêtement

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SE1051353-9 2010-12-21

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103394482A (zh) * 2013-08-14 2013-11-20 耀安电池电源科技（深圳）有限公司 一种纽扣电池清洗机
JP2019099601A (ja) * 2017-11-28 2019-06-24 Ｊｘｔｇエネルギー株式会社 Ｗ／ｏエマルジョン洗浄液を使用する洗浄方法

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US4465715A (en) * 1980-06-30 1984-08-14 Toyoda Gosei Co., Ltd. Process for the pretreatment of a polyolefin product before coating
US5156687A (en) * 1989-08-28 1992-10-20 Nippon Paint Co., Ltd. Method for painting pretreatment of plastic formings and cleaner for painting pretreatment
WO1995004608A1 (fr) * 1993-08-11 1995-02-16 Henkel Corporation Composition et procede destines a un traitment prealable a la peinture de matieres plastiques
JP2002239482A (ja) * 2001-02-19 2002-08-27 Tonen Chem Corp 熱可塑性樹脂成形体の洗浄方法およびこれを利用した熱可塑性樹脂微多孔膜の製造方法
US20020164426A1 (en) * 1999-09-23 2002-11-07 Ennis Thomas James Method of adhering coatings to substrates
WO2005075170A1 (fr) * 2004-02-03 2005-08-18 Linde Aktiengesellschaft Dispositif d'application de revetement sur une surface
US20090281012A1 (en) * 2008-05-09 2009-11-12 Rhodia Inc. Cleaning compositions incorporating green solvents and methods for use

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US5536532A (en) * 1992-11-13 1996-07-16 Oaks; Robert E. Painted polyvinyl chloride articles and process for producing the same

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US4465715A (en) * 1980-06-30 1984-08-14 Toyoda Gosei Co., Ltd. Process for the pretreatment of a polyolefin product before coating
US5156687A (en) * 1989-08-28 1992-10-20 Nippon Paint Co., Ltd. Method for painting pretreatment of plastic formings and cleaner for painting pretreatment
WO1995004608A1 (fr) * 1993-08-11 1995-02-16 Henkel Corporation Composition et procede destines a un traitment prealable a la peinture de matieres plastiques
US20020164426A1 (en) * 1999-09-23 2002-11-07 Ennis Thomas James Method of adhering coatings to substrates
JP2002239482A (ja) * 2001-02-19 2002-08-27 Tonen Chem Corp 熱可塑性樹脂成形体の洗浄方法およびこれを利用した熱可塑性樹脂微多孔膜の製造方法
WO2005075170A1 (fr) * 2004-02-03 2005-08-18 Linde Aktiengesellschaft Dispositif d'application de revetement sur une surface
US20090281012A1 (en) * 2008-05-09 2009-11-12 Rhodia Inc. Cleaning compositions incorporating green solvents and methods for use

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103394482A (zh) * 2013-08-14 2013-11-20 耀安电池电源科技（深圳）有限公司 一种纽扣电池清洗机
JP2019099601A (ja) * 2017-11-28 2019-06-24 Ｊｘｔｇエネルギー株式会社 Ｗ／ｏエマルジョン洗浄液を使用する洗浄方法

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EP2654975A4 (fr) 2015-04-15

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