EP1258296A1 - Pulverbeschichtetes poröses Substrat und Verfahren zur Pulverbeschichtung eines porösen Substrats - Google Patents

Pulverbeschichtetes poröses Substrat und Verfahren zur Pulverbeschichtung eines porösen Substrats Download PDF

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Publication number
EP1258296A1
EP1258296A1 EP01201888A EP01201888A EP1258296A1 EP 1258296 A1 EP1258296 A1 EP 1258296A1 EP 01201888 A EP01201888 A EP 01201888A EP 01201888 A EP01201888 A EP 01201888A EP 1258296 A1 EP1258296 A1 EP 1258296A1
Authority
EP
European Patent Office
Prior art keywords
substrate
powder coating
coating composition
powder
porous
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01201888A
Other languages
English (en)
French (fr)
Inventor
Wilhelm Hendrik Kaptijn
Richard Antonius Bayards
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke DSM NV
Original Assignee
DSM NV
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 DSM NV filed Critical DSM NV
Priority to EP01201888A priority Critical patent/EP1258296A1/de
Priority to AU2002311663A priority patent/AU2002311663A1/en
Priority to PCT/NL2002/000312 priority patent/WO2002094453A2/en
Publication of EP1258296A1 publication Critical patent/EP1258296A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • 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
    • B05D3/02—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 baking
    • B05D3/0209—Multistage baking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/06—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to wood
    • 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
    • B05D3/02—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 baking
    • B05D3/0218—Pretreatment, e.g. heating the substrate
    • B05D3/0227—Pretreatment, e.g. heating the substrate with IR heaters
    • 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
    • B05D3/06—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 radiation
    • B05D3/061—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 radiation using U.V.
    • B05D3/065—After-treatment
    • B05D3/067—Curing or cross-linking the coating

Definitions

  • the invention relates to a wholly or partly powder coated substrate.
  • the invention further relates to a method for powder coating a substrate and to the use of the method for powder coating a substrate, especially a porous substrate.
  • a powder coated substrate is known from the article:
  • the purpose of the invention is to overcome the above indicated disadvantages and to provide a powder coated porous substrate and a method for powder coating a substrate with a powder coating composition, and especially a method for powder coating a porous substrate.
  • porous substrate a substrate that when being powder coated by the standard electrostatic spraying powder coating method visible blisters occur.
  • a standard DSM UV powder coating composition is applied in a layer with a thickness of 90-110 ⁇ m, onto the substrate with a Tribo gun (Nordson Tribo gun, type Tribomatic II Handgun).
  • the standard DSM UV powder coating composition consists of the following components (by weight): 830 parts Uracross® P3125 polyester resin (DSM Resins), 170 parts Uracross® P3307 (DSM Resins), 10 parts Irgacure® 2959 (Ciba Specialty Chemicals Inc.) and 6.7 parts Byk® 361 (Byk Cera). Thereafter the powder coating composition is melted in an infrared oven (Triab IR machine medium wave IR lamps, temperature IR controlled at the coating surface) during 2 minutes at a temperature of 100°C. Six seconds after leaving the infrared oven the molten powder coating composition is cured by means of UV-radiation (Triab UV machine, UV lamp Fusion H-bulb (120 W/cm) UV doses 1000 mJ/cm 2 )
  • the above described method is used to powder coat a substrate. It has appeared to be especially advantageous for porous substrates or heat-sensitive (either porous or non-porous) substrates.
  • the type of heating source is not critical. Commercial equipment as for example a thermal oven, thermal convection oven, IR-radiation or NIR-radiation can be used. However it has been found that the method according to the invention can be advantageously performed by applying infrared (IR) radiation or near infrared (NIR) radiation as the heating source. IR-, and NIR- radiation are especially suitable to pre-heat, in a well-controlled manner, specific areas.
  • IR-, and NIR- radiation are especially suitable to pre-heat, in a well-controlled manner, specific areas.
  • An additional advantage of the use of (N)IR-radiation is that, when large substrates are involved, the resulting energy costs will be lower than when other means are used.
  • the preheating of the substrate is effected until the desired maximum temperature (T max ) is reached.
  • the desired maximum temperature can for example depend on the nature of the substrate and/or the properties of the powder coating composition. When a substrate is heat-sensitive the desired maximum temperature will generally be lower than when the substrate is not heat-sensitive.
  • a heat-sensitive substrate is a substrate that under the influence of increased temperature during a prolonged period of time shows changes in dimension, structure and/or colour. It can even occur that upon the action of increased temperature the substrate degrades in more or less extent.
  • An indication whether a substrate is heat-sensitive can for example be obtained by exposing the substrate during for example 10 minutes to a temperature of for example 180°C.
  • the method according to the invention has appeared to be especially advantageous for these heat-sensitive substrates because by applying this method no disadvantageous effects of the heating have been observed.
  • the properties of the powder coating composition determine amongst other things, the flow of the molten powder coating composition. A certain level of flow should be reached to obtain a (powder) coated substrate with acceptable appearance and properties. The level of flow necessary to reach this goal is different for most powder coating compositions, therefore no specific indication can be given in this respect, however it can be easily determined by the skilled man. The desired maximum temperature can easily, without any undue burden, be determined by the man skilled in the art.
  • the desired maximum temperature should at least be 5°C above the melting temperature of the powder coating composition. The reason for this is to be sure that the whole powder coating composition is molten. Preferably the desired maximum temperature is at least 25°C higher than the melting temperature of the powder coating composition.
  • the melting temperature can be determined by standard DSC-techniques, for example a DSC 2920 from TA Instruments. The DSC-measurement is performed with modulated DSC. The heating and cooling rate is 1°C/min, the modulation amplitude is 0.159 °C/60 seconds ("heat-only mode"). In case of a crystalline component the end of the melting peak is used to determine the melting temperature (T melt ). In case of an amorphous component the glass transition temperature (T g ) is used to determine the melting temperature.
  • the duration of the preheating step (a) is not particularly critical and can be chosen between wide ranges.
  • the duration and heat power will in most cases depend on the nature of the substrate by the fact that for some substrates a longer time is needed to reach the desired maximum temperature than for others. Amongst other things this is determined by the heat capacity of the substrate.
  • the duration can for example be chosen between 0,1 and 1800 seconds, preferably between 1 and 600 seconds, more preferred between 2 and 300 seconds.
  • the substrates that especially benefit from the invention are the porous substrates.
  • the substrates that benefit most from the invention are the porous, heat-sensitive substrates.
  • porous substrates heat-sensitive or not
  • heat sensitive substrates are wood, for example hardwood, hard board, wood composites, for example particle board, high, medium or low density fiber board, plywood and other substrates that contain a significant amount of wood.
  • porous, heat sensitive substrates include all kinds of solid wood, veneer, chip wood, wood composite material, cork, paper, cardboard or plastic, for example SMC.
  • the invention is also suitable for traditional heat resistant (either porous or not) substrates, for example metal, (galvanized) steel, cast iron, other alloys, glass, ceramic and bricks.
  • the porous substrate is wood it has appeared to be advantageous to dry the wooden substrate before step a) in the method for powder coating according to the invention, to reach a humidity of the substrate between 8-22% (borders inclusive). In case this additional drying step is performed it has appeared to give a lower risk for the formation of blisters.
  • the humidity can be determined with the aid of a hygrometer.
  • powder coating composition is generally meant the final composition that is suitable for application onto a substrate.
  • the powder coating composition generally comprises one or more resins with functional groups and/or one or more curing agents.
  • the powder coating composition can in addition to this also comprise one or more of the following: photo-initiator, pigment, and other generally used coating additives.
  • (powder) coating is generally meant the resulting product from the curing of the (powder) coating composition.
  • the length of time can be chosen in a wide range, for example between 0,1 and 300 seconds. Preferably this length of time is between 1 and 120 seconds, more preferred between 2 and 20 seconds.
  • step (a) After that the substrate has been preheated until the desired maximum temperature (T max ) in step (a), the power of the heating source is in step b) either reduced or switched off. This can be effected before, simultaneously with or after that the powder coating composition has been applied onto the preheated substrate.
  • the powder coating composition is cured in step c).
  • the curing of the powder coating composition can be effected by radiation curing, for example electron beam radiation (EB) or ultraviolet radiation (UV). It is preferred to effect the curing by the use of UV radiation.
  • Standard UV light sources are suitable for curing the coating, for example medium pressure mercury-, iron doped mercury-, and/or gallium doped mercury-vapor lamps. Hardening of the coating is normally very quick. It can take between 1 millisecond and 25 seconds. Preferably it takes less than 10 seconds, more preferably less than 5 seconds.
  • the temperature at which the curing takes place is not especially critical and can vary within wide ranges. Curing can for example take place at elevated temperatures, but it is also possible to cure at lower temperatures, for example room temperature or below. However when the temperature during the curing step becomes too low the properties of the final coating are not satisfactory. The lowest possible temperature that still gives acceptable coating properties depends on the powder coating composition. This can be easily determined by the man skilled in the art.
  • the preferred temperature range for curing is 15-200 °C, more preferred 20-175°C and most preferred between 25-150°C.
  • the thickness of the powder coating layer can vary between wide ranges. Generally it is between 5 and 500 ⁇ m, preferably the thickness is between 10 and 200 ⁇ m, more preferred between 50 and 100 ⁇ m.
  • the powder coating composition can be applied onto the substrate in a repeated cycle of step a), b) and step c). By repeating step a), b) and step c) several layers of the powder coating composition are applied onto the substrate. This can be desirable when the powder coating layer is very thin and where full coverage is desired or in case layers with several colours or compositions should be applied.
  • the method for powder coating a substrate according to the invention has always the proviso that after step a) and before step c) the temperature of the substrate should not increase. In case these requirements are not met the appearance and properties of the final coating are not satisfactory in that blisters are visible.
  • the temperature of the substrate will, at a fixed point in time, not be the same when measured along the thickness of the substrate.
  • the temperature of the substrate will show a kind of temperature profile along the thickness.
  • the temperature of the coating composition can be determined by use of a high performance infrared thermometer (Raynger MX4 from the firm Raytek). In certain cases, which can be easily determined by the man skilled in the art, it is advantageous in the method for powder coating according to the invention to allow the applied powder coating composition on the substrate sufficient time to flow after the powder coating composition is applied in step b) and before the curing of step c) is effected.
  • the length of time that is used depends on the nature and properties of both the substrate and the powder coating composition. The length of time can vary between wide ranges but is mostly relatively short, for example between 0,1 and 900 seconds, preferably between 0,5 and 240 seconds, more preferred between 1 and 120 seconds.
  • the method for powder coating a substrate according to the invention can sometimes benefit from the addition, after step b), of an additional step (b2) that consists of the mildly heating the powder coating composition during the application of the powder coating composition, to compensate for the cooling action of the powder-gun, such as to reach a slowly decreasing temperature of the substrate top-layer with the applied powder coating composition, with the proviso that after step a) and before step c) the temperature of the substrate should not increase.
  • the additional step 2b can be very valuable when powder coating a porous, heat-sensitive substrate.
  • heat-sensitive substrates cannot be pre-heated to very high temperatures, there is most of the time only a limited margin between the desired maximum temperature and the melting temperature of the powder coating composition.
  • the result of this limited margin is that the temperature of the top-layer of the substrate together with the composition can become too low because of the cooling action due to the application of the cold powder with a powder gun and the air flow of the powder gun.
  • additional (mild) heating during the spraying of the powder coating composition onto the substrate. It is also possible to consider preheated air upon spraying.
  • the invention further relates to a wholly or partly powder coated porous substrate wherein in the powder coating no blisters are present with a size larger than 30 ⁇ m. It is generally accepted that blisters with a size larger than 30 ⁇ m are at least visible. It is preferred to have no blisters present with a size larger than 15 ⁇ m. It is even more preferred to have no visible (by the naked eye) blisters at all present.
  • the thickness of the finally obtained powder coating on the substrate is chosen on demand. Usually depending on the final application wherein the wholly or partly powder coated substrate will be used. However it is preferred that the thickness of the powder coating is between 10 and 1000 ⁇ m, because between these ranges the best appearance of the coated substrate can be obtained.
  • the substrate can be coated with one or with various layers of coating compositions mostly depending on the final thickness or properties that is/are desired.
  • the coating compositions used can all have the same composition and properties or they can have different compositions and properties, for example different colours or different outdoor resistance.
  • the various coating compositions that are used to apply the various layers can even belong to different kinds of systems, for example one layer can be obtained after applying a powder coating composition and the other layer or layers can be obtained by applying another powder coating composition or even a wet coating composition. No real limitations exist in the combination of coating compositions.
  • the preferred substrate comprises one or more coating layer(s) wherein the only or first layer is the powder coating layer.
  • the more preferred substrate consists of only one coating layer.
  • Coating compositions are applied onto a substrate for various reasons, for example to protect the substrate against weather influences (ageing, discoloration) or to give the substrate a better appearance.
  • various powder coating compositions can be chosen.
  • powder coating compositions exist that result in a clear coat or powder coating compositions that on the other hand result in a pigmented coat.
  • Substrates that have an attractive appearance of themselves are preferably powder coated with a clear coat. Examples of this kind of substrates are all kinds of wood.
  • Substrates whose appearance can be improved are preferably coated with a pigmented coat.
  • the invention further relates to the coating and the powder-coated substrate that is obtainable by the method according to the invention, which method is described above.
  • a powder coating composition with a melting temperature of approximately 100°c was used. it had the following composition: COMPONENT PARTS (BY WEIGHT) REMARKS URACROSS® P 3125 830 EX DSM COATING RESINS URACROSS® P 3307 170 EX DSM COATING RESINS IRGACURE® 2959 10 EX CIBA SPECIALTY CHEMICALS INC. BYK® 361 6,7 EX BYK CERA
  • the deal was pre-heated by means of IR-radiation to 150°C in 1 minute.
  • the powder coating composition was sprayed onto the substrate upon which the substrate was cooled down to 120°C, in such a way that no outgassing from the deal occurred.
  • the coating was melted to a homogeneous, well-flown film and was subsequently cured by means of UV-radiation (1 J/cm2). The result is shown in photograph 1.
  • the oak was pre-heated by means of IR-radiation to 150°C in 1 minute.
  • the powder coating composition was sprayed onto the substrate, subsequently it was cooled down to 120°C, in such a way that no outgassing from the oak occurred.
  • the powder coating composition was melted to a homogeneous well-flown film and subsequentlycured by means of UV-radiation (1 J/cm2).
  • the oak was sprayed with the powder coating composition at room temperature. Thereaftere the powder coating composition was melted at 100°C by means of IR-radiation, followed by UV-curing (1 J/cm2). The result is shown in photograph D.
  • the oak was pre-heated in 10 min. to 120°C in an oven. Due to transport from oven to spray cabin and spraying with the powder coating composition the temperature of the substrate became under the melting temperature of the powder coating composition. As a result of that the powder coating composition did not show proper melting of the top layer. To obtain a homogeneous film the coated oak was heated up again by means of IR-radiation in 2 minutes to 120°C and then cured by UV-radiation (1 J/cm2). The result is shown in photograph E.
  • Walnut was pre-heated by means of IR-radiation to 150°C in 1 minute.
  • the powder coating composition was sprayed and the sprayed substrate was cooled down to 120°C, in such a way that no out gassing from the walnut occurred.
  • the coating was melted to a homogeneous well-flown film and subsequently cured by UV-radiation (1 J/cm2). The result is shown in photograph III.
  • the walnut was sprayed with the powder coating composition at room temperature. Subsequently the powder coating composition was melted at 100°C by means of IR-radiation, followed by UV-curing (1 J/cm2). The result is shown in photograph G.
  • the walnut was pre-heated in 10 min. to 120°C. Due to transport from oven to spray cabin and spraying with the powder coating composition, the temperature of the substrate became under the melting temperature of the powder coating composition and the top layer of the powder coating composition did not show proper melting. To obtain a homogeneous film the powder coated walnut was heated up again by means of IR-radiation in 2 minutes to 120°C and then cured by means of UV-radiation (1 J/cm2). The result is shown in photograph H.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)
EP01201888A 2001-05-18 2001-05-18 Pulverbeschichtetes poröses Substrat und Verfahren zur Pulverbeschichtung eines porösen Substrats Withdrawn EP1258296A1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP01201888A EP1258296A1 (de) 2001-05-18 2001-05-18 Pulverbeschichtetes poröses Substrat und Verfahren zur Pulverbeschichtung eines porösen Substrats
AU2002311663A AU2002311663A1 (en) 2001-05-18 2002-05-15 Powder coated porous substrate and a method for powder coating a porous substrate
PCT/NL2002/000312 WO2002094453A2 (en) 2001-05-18 2002-05-15 Powder coated porous substrate and a method for powder coating a porous substrate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01201888A EP1258296A1 (de) 2001-05-18 2001-05-18 Pulverbeschichtetes poröses Substrat und Verfahren zur Pulverbeschichtung eines porösen Substrats

Publications (1)

Publication Number Publication Date
EP1258296A1 true EP1258296A1 (de) 2002-11-20

Family

ID=8180342

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01201888A Withdrawn EP1258296A1 (de) 2001-05-18 2001-05-18 Pulverbeschichtetes poröses Substrat und Verfahren zur Pulverbeschichtung eines porösen Substrats

Country Status (3)

Country Link
EP (1) EP1258296A1 (de)
AU (1) AU2002311663A1 (de)
WO (1) WO2002094453A2 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107670938A (zh) * 2016-08-01 2018-02-09 苏州考斯丹五金制品有限公司 板材表面粉末固化的紫外加红外辐照加热设备
CN107983609A (zh) * 2017-11-28 2018-05-04 山东宜居新材料科技有限公司 一种uv印刷木塑制品的制备方法
CN110496753A (zh) * 2019-09-18 2019-11-26 粉饰科技(广东)有限公司 一种基材表面涂装工艺、处理方法及复合材料
WO2022031930A1 (en) * 2020-08-05 2022-02-10 Keyland Polymer Material Sciences, Llc Coated panels provided via cured power, and associated methods and production apparatus

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3161530A (en) * 1959-08-10 1964-12-15 Minnesota Mining & Mfg Coated pipe and process
US4905760A (en) * 1987-10-26 1990-03-06 Ico, Inc. Sucker rod coupling with protective coating
DE19533858A1 (de) * 1995-09-13 1997-07-03 Ihd Inst Fuer Holztechnologie Verfahren zum elektrostatischen Beschichten von Holz und Holzwerkstoffen
WO1997047398A1 (de) * 1996-06-07 1997-12-18 Basf Coatings Ag Mit pulverlack beschichteter wärmeempfindlicher werkstoff
WO1999014254A1 (en) * 1997-09-17 1999-03-25 Dsm N.V. Powder paint binder composition

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3161530A (en) * 1959-08-10 1964-12-15 Minnesota Mining & Mfg Coated pipe and process
US4905760A (en) * 1987-10-26 1990-03-06 Ico, Inc. Sucker rod coupling with protective coating
DE19533858A1 (de) * 1995-09-13 1997-07-03 Ihd Inst Fuer Holztechnologie Verfahren zum elektrostatischen Beschichten von Holz und Holzwerkstoffen
WO1997047398A1 (de) * 1996-06-07 1997-12-18 Basf Coatings Ag Mit pulverlack beschichteter wärmeempfindlicher werkstoff
WO1999014254A1 (en) * 1997-09-17 1999-03-25 Dsm N.V. Powder paint binder composition

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107670938A (zh) * 2016-08-01 2018-02-09 苏州考斯丹五金制品有限公司 板材表面粉末固化的紫外加红外辐照加热设备
CN107983609A (zh) * 2017-11-28 2018-05-04 山东宜居新材料科技有限公司 一种uv印刷木塑制品的制备方法
CN110496753A (zh) * 2019-09-18 2019-11-26 粉饰科技(广东)有限公司 一种基材表面涂装工艺、处理方法及复合材料
WO2022031930A1 (en) * 2020-08-05 2022-02-10 Keyland Polymer Material Sciences, Llc Coated panels provided via cured power, and associated methods and production apparatus

Also Published As

Publication number Publication date
WO2002094453A3 (en) 2003-12-31
AU2002311663A1 (en) 2002-12-03
WO2002094453A2 (en) 2002-11-28

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