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WO2001085360A2 - Procede de revetement - Google Patents

Procede de revetement Download PDF

Info

Publication number
WO2001085360A2
WO2001085360A2 PCT/GB2001/002038 GB0102038W WO0185360A2 WO 2001085360 A2 WO2001085360 A2 WO 2001085360A2 GB 0102038 W GB0102038 W GB 0102038W WO 0185360 A2 WO0185360 A2 WO 0185360A2
Authority
WO
WIPO (PCT)
Prior art keywords
paint
precursor
plastic
coated
pigment
Prior art date
Application number
PCT/GB2001/002038
Other languages
English (en)
Other versions
WO2001085360A3 (fr
Inventor
Mark P. Kearns
Antonio Marcilla Gomis
Original Assignee
The Queen's University Of Belfast
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 The Queen's University Of Belfast filed Critical The Queen's University Of Belfast
Priority to AU2001256473A priority Critical patent/AU2001256473A1/en
Publication of WO2001085360A2 publication Critical patent/WO2001085360A2/fr
Publication of WO2001085360A3 publication Critical patent/WO2001085360A3/fr

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
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/20—Compounding polymers with additives, e.g. colouring
    • C08J3/203—Solid polymers with solid and/or liquid additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/0427—Coating with only one layer of a composition containing a polymer binder
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/043—Improving the adhesiveness of the coatings per se, e.g. forming primers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/03—Powdery paints
    • 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
    • B05D3/08—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 flames
    • 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
    • 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
    • B05D3/14—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 electrical means
    • B05D3/141—Plasma treatment
    • B05D3/142—Pretreatment

Definitions

  • the present invention relates to a process for coating a material and in particular to a process for coating a surface, particularly but not exclusively for coating a plastic material .
  • the present invention is directed towards overcoming these problems and in particular to providing a cheaper and more versatile process for coating various surfaces including plastic materials.
  • the powdered plastic has a small particle size which can be obtained by any conventional process, for example, mechanical or cryogenic grinding.
  • the powdered plastic has a particle size with a diameter of less than 0.01 mm. This will produce a high quality surface finishing paint. A larger particle size could be used where an intermediate surface finishing paint is required.
  • suitable polymers are useable in the present invention, such as polyethylene, polypropylene, nylon, etc.
  • the paint precursor to be melted can be a dry blend of the powdered plastic and pigment, or a ground masterbatch with these constituents.
  • the paint precursor contains powdered plastic and pigment in a ratio range of between 4:1 and 19:1 respectively.
  • the powdered plastic and pigment is in a ratio range of between : 1 and 9:1.
  • the ratio of the powdered plastic to pigment chosen depends on the effect desired such as, the thickness of the paint layer, the covering power of the pigment and its effect on the concentration of the liquid paint and the physical strength of the coating required. Different coatings ranging from translucent to opaque may be obtained by changing the concentration and/or covering power of the pigment.
  • the constituents of the paint precursor are thoroughly mixed prior to melting. This promotes uniform properties and colour throughout the paint precursor and helps prevent the formation of agglomerates.
  • the constituents of the paint precursor can be mixed by fluidising the precursor in a conventional fluidising column.
  • the constituents of the paint precursor may be blended by other systems of mixing, for example, high shear dry blending, shaking, or dispensing (by weight or volume) the constituents in an entraining stream.
  • the constituents of the paint precursor are blended prior to fluidising the precursor in the fluidising column. This helps further reduce the formation of agglomerates.
  • the size of the precursor particles is determined prior to delivery of the precursor to the fluidising column.
  • the paint precursor is then melted to form a dispersion of liquid paint droplets.
  • this is done in a heat exchanger using hot air as the heating medium.
  • the heat exchanger also acts as a spraying device using the hot air as a propellant gas to apply the liquid paint to the surface to be coated.
  • the paint precursor is heated prior to melting, for example by warming the air stream to the fluidising column.
  • the pigment of the paint precursor may be of any type.
  • the pigment is compatible with the powdered plastic of the paint precursor.
  • the type of pigment may also be chosen to provide a liquid paint with special effects, for example metallic or pearl effects.
  • the process of the present invention can be used to paint any suitable surface to provide a temporary or permanent coating.
  • Such surfaces include plastic, metal, glass, ceramic, etc.
  • the process can be used to coat metal such as the inside of a metal shell or mould, pre-moulding, to provide a coating attachable to the moulding material, e.g. as a colour scheme, to thicken an area of the moulding or to add any protective-like coating.
  • the plastic material could be a thermoplastic material.
  • the powdered plastic of the paint precursor is the same polymer as the plastic material to be coated.
  • the powdered plastic of the paint precursor is a polymer which is compatible with the plastic material to be coated. . .
  • the plastic material to be coated- is treated prior to being coated.
  • this includes heating the surface of the plastic material, preferably to a temperature which will melt the surface. This improves the adhesion of the liquid paint to the plastic material.
  • any temperature below the melting point of the plastic material may be used, however, the limiting temperature and treatment time will be that which will assure no shape distortion of the plastic material.
  • the treatment of the plastic material may further include flame, plasma, corona and/or chemical etching of the surface of the plastic material to be coated. These treatments of the surface of the plastic material to be coated are particularly useful when the powdered plastic of the paint precursor is not the same or is not compatible with the plastic material to be coated.
  • the treatment of the plastic material prior to being coated improves the compatibility and adhesion of the liquid paint to the plastic material providing a more resistant coating.
  • the liquid paint and surface such as a plastic material to be coated can be oppositely charged to improve the distribution of the liquid paint on the surface and promote its adherence thereto.
  • the present process is applied in a patterned manner, e.g. through a template or similar,, to provide a patterned coating.
  • the coating is useable as an adhesive between the surface to which it is applied, and a second surface, e.g. two plastic parts or plates.
  • the paint precursor includes one or more additives or filler materials such as a UN-adsorber, microwave, etc., glass microspheres, antibacterial agent, etc. Such substances are known in the art, and enhance the properties of the coating.
  • Fig 1 shows a schematic illustration of the process according to the present invention.
  • polyethylene (PE) polymer is ground into a powder with a particle size having a diameter of less than 0.01 mm.
  • the powdered PE is then mixed in a feeder column 2 with a pigment in a ratio of 9:1 respectively.
  • the mixture is subsequently shear dry blended to form a paint precursor 1.
  • a polyethylene (PE) article 13 is to be coated and polyethylene (PE) was chosen to form the powdered plastic of the paint precursor 1 because of its compatibility therewith.
  • the paint precursor 1 is fed from the feeder column 2 through a sieve (not shown) to a fluidising column 3 by way of a paint precursor inlet pipe 4.
  • the sieve controls and determines the precursor particle size fed to the fluidising column 3.
  • the fluidising column 3 further includes an air inlet pipe 5 at the base of the column 3, a perforated plate 6 positioned intermediate the base of the column 3 and the paint precursor inlet pipe 4 such that the outer perimeter of the plate 6 lies flush with the internal perimeter of the column 3, an air outlet pipe 7 at the top of the column 3, and a paint precursor delivery pipe 8.
  • a system of valves (not shown) to control the flow of air and a filter is placed in the air outlet pipe 7. Air is fed through the pipe 5 and passes through the perforated plate 6, the paint precursor 1, and exits the outlet pipe 7.
  • the paint precursor 1 in the column 3 takes on the properties of a fluid. This is commonly termed , ⁇ fluidisation" . In this way the pigment and powdered PE mix more thoroughly giving a paint precursor 1 with more uniform properties. Fluidising the paint precursor 1 also prevents the formation of agglomerates.
  • the paint precursor 1 is then delivered through the pipe 8 to a heater 9 where it comes into contact with a hot air stream passing through the heater 9 from a hot air inlet 10. This melts the precursor 1 to form a dispersion of liquid paint droplets 11. . .. : . .
  • the liquid paint 11 so formed is sprayed from the outlet 12, using the hot air as a propulsion gas, onto the plastic article 13 to be coated.
  • the distance between the outlet 12 and the article 13 must be closely controlled to obtain optimum results. If the outlet 12 is held too far from the article 13 then the liquid paint 11 is exposed to the ambient air for too long, rapidly reducing the temperature of the liquid paint 11 and encouraging the onset of early solidification. If the outlet 12 is held too near the article 13, it may cause distortion of the article 13 due to the force and temperature of the liquid paint 11 being sprayed and the hot air.
  • any suitable gas such as nitrogen may be used instead of air during the fluidising and melting steps. This in particular would prevent fire risks which may be experienced during the melting of the paint precursor 1.
  • the pigment and powdered PE may be control fed to the fluidising column 3 through different pipes to control, adjust or affect the paint precursor 1. It will further be appreciated that the air fed to the fluidising column may be pre-heated to increase the temperature of the paint precursor 1 prior to melting. Having the melting process as a two step process instead of one is more efficient.
  • the liquid paint 11 and the article 13 to be coated may also be oppositely charged to improve the distribution of the liquid paint 11 on the article 13 and promote its adherence thereto.
  • the process of the present invention can be used to coat any plastic material.
  • the powdered plastic of the paint precursor 1 is the - same polymer as the plastic material to be coated.
  • the powdered plastic of the paint precursor 1 is a polymer which is compatible with the plastic material to be coated.- ' • •

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)

Abstract

L'invention concerne un procédé permettant d'appliquer un revêtement sur une surface Les différentes étapes de ce procédé consistent à mélanger un polymère de plastique en poudre avec un pigment pour former un précurseur de peinture, à faire fondre ce précurseur pour former une peinture liquide et à appliquer cette peinture liquide sur la surface qui doit recevoir le revêtement. Pour le revêtement des matières plastiques, le matériau plastique peut être un matériau thermoplastique. Le plastique en poudre du précurseur est de préférence le même polymère que le matériau plastique à recouvrir. Cette invention vise à offrir un procédé meilleur marché et plus polyvalent pour le revêtement de diverses surfaces, notamment de surfaces plastiques. L'invention concerne également un dispositif permettant la mise en oeuvre de ce procédé.
PCT/GB2001/002038 2000-05-11 2001-05-10 Procede de revetement WO2001085360A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001256473A AU2001256473A1 (en) 2000-05-11 2001-05-10 Coating process

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB0011284.7A GB0011284D0 (en) 2000-05-11 2000-05-11 Coating process
GB0011284.7 2000-05-11

Publications (2)

Publication Number Publication Date
WO2001085360A2 true WO2001085360A2 (fr) 2001-11-15
WO2001085360A3 WO2001085360A3 (fr) 2002-04-04

Family

ID=9891337

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2001/002038 WO2001085360A2 (fr) 2000-05-11 2001-05-10 Procede de revetement

Country Status (3)

Country Link
AU (1) AU2001256473A1 (fr)
GB (1) GB0011284D0 (fr)
WO (1) WO2001085360A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004011531A1 (fr) * 2002-07-26 2004-02-05 H.B. Fuller Company Procedes polyvalents de preparation et d'utilisation de nouvelles particules composites dans des compositions de revetement en poudre
WO2009076689A3 (fr) * 2007-12-14 2009-12-23 High Tech Coatings Gmbh Procédé de fabrication d'un revêtement polymère
EP2221116A1 (fr) * 2009-02-20 2010-08-25 BÜFA Gelcoat Plus GmbH & Co. KG Procédé d'application d'une résine réactive, notamment d'une résine de polyester ou de vinyle pour un revêtement de gel à la surface d'un élément de formage

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4958058A (en) * 1989-02-08 1990-09-18 General Electric Company Transverse flow laser spray nozzle
US5585426A (en) * 1994-10-05 1996-12-17 Nexus Corporation Process for imparting an electrostatic charge to powders to render them useful for coating application
DE19612974A1 (de) * 1996-04-01 1997-10-02 Hoechst Ag Pulverbeschichtungen mit vom Betrachtungswinkel abhängigem Farbeindruck
WO1998008614A1 (fr) * 1996-08-30 1998-03-05 Bernecki Thomas F Application de polymere au moyen de gaz chauds

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004011531A1 (fr) * 2002-07-26 2004-02-05 H.B. Fuller Company Procedes polyvalents de preparation et d'utilisation de nouvelles particules composites dans des compositions de revetement en poudre
US7105201B2 (en) 2002-07-26 2006-09-12 H.B. Fuller Licensing & Financing, Inc. Versatile processes for preparing and using novel composite particles in powder coating compositions
US7622072B2 (en) 2002-07-26 2009-11-24 Valspar Sourcing, Inc. Versatile processes for preparing and using novel composite particles in powder coating compositions
EP2267063A1 (fr) * 2002-07-26 2010-12-29 Valspar Sourcing, Inc. Procédés polyvalents de préparation et d'utilisation de nouvelles particules composites dans des compositions de revêtement en poudre
WO2009076689A3 (fr) * 2007-12-14 2009-12-23 High Tech Coatings Gmbh Procédé de fabrication d'un revêtement polymère
CN101896740A (zh) * 2007-12-14 2010-11-24 高科涂层有限公司 制备聚合物涂层的方法
JP2011506064A (ja) * 2007-12-14 2011-03-03 ハイ テク コーティングス ゲゼルシャフト ミット ベシュレンクテル ハフツング ポリマーコーティングを形成する方法
EP2221116A1 (fr) * 2009-02-20 2010-08-25 BÜFA Gelcoat Plus GmbH & Co. KG Procédé d'application d'une résine réactive, notamment d'une résine de polyester ou de vinyle pour un revêtement de gel à la surface d'un élément de formage

Also Published As

Publication number Publication date
AU2001256473A1 (en) 2001-11-20
WO2001085360A3 (fr) 2002-04-04
GB0011284D0 (en) 2000-06-28

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