WO2024058734A1 - A surface primer with light color and electrical conductivity for application to automotive plastic surfaces - Google Patents

A surface primer with light color and electrical conductivity for application to automotive plastic surfaces Download PDF

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Publication number
WO2024058734A1
WO2024058734A1 PCT/TR2022/051200 TR2022051200W WO2024058734A1 WO 2024058734 A1 WO2024058734 A1 WO 2024058734A1 TR 2022051200 W TR2022051200 W TR 2022051200W WO 2024058734 A1 WO2024058734 A1 WO 2024058734A1
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Prior art keywords
surface primer
weight
range
component
primer
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Application number
PCT/TR2022/051200
Other languages
French (fr)
Inventor
Alper Kadir KADES
Original Assignee
Kanat Boyacilik Tic. Ve San. A.S.
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Publication of WO2024058734A1 publication Critical patent/WO2024058734A1/en

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Classifications

    • 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
    • C09D5/24—Electrically-conducting paints
    • 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
    • C01B32/15—Nano-sized carbon materials
    • C01B32/158—Carbon nanotubes
    • 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
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • 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
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • C08K3/041—Carbon nanotubes

Definitions

  • the invention relates to a surface primer with light color and electrical for applying base coat and top coat paints to automotive plastic surfaces by the electrostatic method.
  • Plastics are organic polymeric materials that are solid at room temperature and can be shaped and molded by pressure, temperature, mechanical and chemical means. It is ensured that it can be used in a wide variety of sectors by shaping plastics. One of the areas where plastics are used is the automotive industry.
  • Plastic surfaces used in the automotive sector can be TPO (PP/EPDM) based buffer surfaces, all kinds of plastic surfaces to be applied electrostatic base coat/top coat inside and outside the vehicle, etc. It is ensured that the painting process is applied on the plastic surfaces used in the automotive sector. Since plastic surfaces are not conductive like metals, it is not possible to apply the paint on these surfaces by electrostatic method.
  • TPO PP/EPDM
  • Conductive primers are used in the current art to apply paint to plastic surfaces used in the automotive industry. These conductive primers have a conductivity feature with the carbon black component they contain in their structure. For the conductive primer to have sufficient conductivity, the amount of carbon black used must be between 6% and 12% by weight. The carbon black used in this value causes the conductive primer to be very dark.
  • the conductive primer produced by another method known in the present art contains a multi-walled carbon nanotube known as graphite.
  • the multi-walled carbon nanotube component used in the conductive primer should be used at 5% by weight to provide the desired level of conductivity.
  • the use of this ratio of the multi-walled carbon nanotube component causes the conductive primer to be black and/or dark gray. All the problems mentioned above have made it necessary to make an innovation in the relevant technical field as a result.
  • the present invention relates to a surface primer with light color and electrical conductivity for the application of base coat and top coat paints to automotive plastic surfaces by electrostatic method.
  • the main object of the invention is to provide a surface primer that provides the conductive property of the automotive plastic surfaces in the primer layer and allows the application of the base coat and top coat paints to be applied to it by electrostatic method.
  • Another object of the invention is to provide a surface primer with light color.
  • Another object of the invention is to provide a surface primer with electrical conductivity.
  • the present invention is a surface primer with light color and electrical conductivity suitable for use in the application of base coat and top coat paints to automotive plastic surfaces by electrostatic method, comprising single-walled carbon nanotubes as components.
  • the surface primer comprises the single-walled carbon nanotube component at most 1% by weight.
  • the surface primer comprises the single-walled carbon nanotube component in the range of 0.1% to 1% by weight.
  • the single-walled carbon nanotube in the surface primer is dispersed in at least one plasticizer and/or at least one stabilizer.
  • the surface primer comprises an acrylic resin component in the range of 20% to 30% by weight.
  • the surface primer comprises a wetting component in the range of 0.2% to 1 .5% by weight.
  • the surface primer comprises a white pigment component in the range of 14% to 20% by weight.
  • the possible embodiment of the invention is that the said white pigment component of the surface primer is in rutile type form.
  • the surface primer comprises a rheology additive component in the range of 0.2% to 1% by weight.
  • the possible embodiment of the invention is that the rheology additive component of the surface primer is in the form of clay.
  • the surface primer comprises at least one solvent component in the range of 50% to 60% by weight.
  • the surface primer comprises a singlewalled carbon nanotube dispersion in the range of 0.1% to 1% by weight; an acrylic resin in the range of 20% to 30% by weight; a wetting agent in the range of 0.2% to 1 .5% by weight; a white pigment in the range of 14% to 20% by weight; a rheology additive in the range of 0.2% to 1% by weight; and at least one solvent component in the range of 50% to 60% by weight.
  • the term "primer” refers to a chemical mixture that adheres to the surface it is applied, covers the scratches and mold defects on the surface, and provides a homogeneous surface.
  • base coat refers to the paint layer that gives the color and visual effect expected from the paint applied on the primer layer. With the varnish layer applied on the base coat layer, the paint application gamut with protection and decorative features is completed.
  • top coat refers to the paint layer applied to protect the surface and give it a decorative appearance.
  • the alternative to the base coat/varnish application gamut is top coat paint.
  • the "electrostatic method” is the process of applying electrically charged paint particles to a material grounded with the help of compressed air.
  • the term "light colored” refers to the surface being provided in a bright form by absorbing a large part of the light falling on the painted surface.
  • conductive refers to the situation where electrical current and/or heat is allowed to pass through the surface.
  • One of the innovative aspects of the invention is that it enables the application of surface primer to automotive plastic surfaces, ensures the application of base coat and top coat paints by electrostatic method, distributes homogeneously, and has light color and electrical conductivity.
  • the surface primer of the present invention comprises at least one component for obtaining the desired performances.
  • the surface primer of the present invention preferably comprises multiple components.
  • the surface primer of the present invention comprises a single-walled carbon nanotube (to be abbreviated as SWCNT) as a component to provide electrical conductivity.
  • SWCNT single-walled carbon nanotube
  • the single-walled carbon nanotube component of the invention is a single-rounded graphene layer.
  • the SWCNT component in the surface primer of the present invention is in the range of 0.1% to 1% by weight.
  • the SWCNT component ensures that the surface primer has the desired light color and electrical conductivity thanks to its use in the proportions determined in the surface primer.
  • the SWCNT component in the surface primer of the present invention is preferably dispersed in the plasticizer and/or stabilizer.
  • the surface primer of the present invention comprises an acrylic resin component.
  • the acrylic resin component is located to provide the paint-binding properties of the surface primer.
  • the acrylic resin within the surface primer is preferably in the form modified by the CPO chemical compound.
  • CPO is the abbreviation of the chlorinated polyolefin compound.
  • the acrylic resin is preferably modified with the CPO chemical compound, allowing the primer of the invention to adhere to low-energy surfaces.
  • the acrylic resin contained in the surface primer is preferably in the form modified by the CPO chemical compound, as well as in the form of hydroxy-function. Since the surface primer with the configurations mentioned in the invention contains free hydroxyl groups, it is used by combining with an aliphatic isocyanate hardener before application. Polyurethane bonds are formed after the reaction with the hardener. Polyurethane bonds increase the chemical, mechanical, and water resistance of the product.
  • the acrylic resin component in the surface primer of the present invention is in the range of 20% to 30% by weight.
  • the presence rates of the acrylic resin component for the surface primer of the invention are critical, allowing the acrylic resin component in the specified weight ratios to adhere strongly to the surface of the product of the invention.
  • the surface primer of the present invention comprises at least one wetting component.
  • Wetting agents are added to the surface primer in very small amounts and show very important effects during manufacturing, storage, application of surface primer, and improvement of surface primer film character.
  • the wetting agent also increases the brightness of the surface primer.
  • the wetting component used in the surface primer of the present invention is a high molecular weight copolymer.
  • the wetting component in the surface primer of the present invention is in the range of 0.2% to 1.5% by weight.
  • the wetting component has critical weight ratios, and the wetting component in the specified weight ratios must ensure the stable distribution of SWCNT grains in the product.
  • the surface primer of the present invention comprises at least one white coloring pigment component.
  • Pigments are finely powdered inorganic and organic compounds used in the production of various surface primers due to their color. Pigments are used to provide color and coverage in the surface primer. Covering directly depends on the difference between the refractive index of the pigment and the refractive index of the varnish. As the refraction index of the pigment grows, its coverage is strengthened.
  • the white pigment component is added to provide light color within the surface primer.
  • the rutile type form compound is used as the white pigment component used in the surface primer of the present invention. As is known, the rutile form is a form of TiOs, in which the term rutile form refers also to the TiOs compound.
  • the refractive index of rutile pigment is higher than other species. This ensures that the covering of the primer used is strengthened.
  • the white pigment component in the surface primer of the present invention is in the range of 14% to 20% by weight. The white pigment weight ratios determined by the present inventors are critical for
  • the surface primer of the present invention comprises at least one rheology additive component.
  • the rheology additive component used in the surface primer of the present invention is in clay form.
  • the rheology additive component in the surface primer of the present invention is in the range of 0.2% to 1% by weight.
  • the surface primer of the present invention comprises at least one solvent component.
  • the solvent components used in the surface primer of the present invention preferably comprise one of the aromatic based and/or acetate compounds or a mixture thereof. Solvents allow adjustment of the surface primer viscosity. The solvents also facilitate the application of the surface primer to the surface by enabling the resin to be made into a solution.
  • the solvent components in the surface primer of the present invention are in the range of 50% to 60% by weight.
  • Table 1 Representation of the weight ratios of the raw materials within the surface primer.
  • the surface primer of the present invention is obtained as a result of the mixture of acrylic resin, wetting agent, white pigment, SWCNT dispersion, rheology additive, and solvents in predetermined weight ratios.
  • the surface primer obtained with the formulation given in the invention has the desired color and electrical conductivity values.
  • the surface primer with the configurations mentioned in the invention provides a conductivity of ⁇ 500 kQ when applied at a dry film thickness of 4 to 10 microns. This conductivity level enables the application of a base coat and/or top coat on the primer by electrostatic method.
  • the primer of the invention is light gray and the L value is > 68.
  • SWCNT dispersion is the most important component that must be dispersed for the production of the surface primer of the present invention.
  • the dispersion process is provided by a mixer.
  • parameters such as the geometry of the mixing knife, the boiler diameter ratio, the blade diameter ratio, the mixing time, etc. must be adjusted in appropriate proportions. It is preferred to use the cowless type agitator for the production of the surface primer of the present invention.
  • the boiler diameter/stirrer diameter ratio in the range of 3/1 to 2/1 for the production of the surface primer of the present invention. It is preferred that the mixing time for the production of the surface primer of the present invention is around 20 minutes. It is preferred that the tip speed for the production of the surface primer of the present invention is in the range of 12 to 18 meters/second. After premixing, the dispersion quality is increased by passing it through the zirconium bead-containing crushing machine. It is preferable to provide a crushing fineness of approximately 15 microns in the crushing machine for the production of the surface primer of the present invention.
  • the paint gamut is applied to automotive plastic surfaces in such a way that the following steps are carried out.
  • the surface primer with the configurations mentioned in the invention is applied to the PP-based buffer surface after flame etching.
  • a base coat is applied approximately 5 to 10 minutes after the application of the surface primer.
  • the base coat is applied at a value in the range of 10 to 20 microns.
  • Varnish is applied approximately 10 to 15 minutes after base coat application.
  • Varnish is applied at a value in the range of 25 to 40 microns.
  • the baking process is applied at 80 e C for 30 minutes.
  • the surface primer was washed with pressurized water on the top-coated plastic surfaces obtained by the electrostatic method before and after the application.
  • Pressurized water washing tests are applied at 11 .3 l/min flow rate and 60 e C. Pressure water washing tests are performed at a distance of 16.5 cm and 90 e . The washing test with pressurized water was performed on the Karcher HDS 10/20-4 M machine for approximately 1 minute.
  • Thermal shock tests were applied to the top-coated plastic surfaces obtained by the electrostatic method before and after the application of the surface primer. It was applied at 105 e C for 15 hours, for 30 minutes at ambient temperature at -40 e C for 8 hours, and for 30 minutes at ambient temperature. A thermal shock test was applied for 3 cycles. As a result of the said applications, no removal of the dye was observed after washing with pressurized water.
  • thermal aging was applied to the top-coated plastic surfaces obtained by the electrostatic method.
  • aging was applied at 80 e C for about 10 days.
  • adhesion loss was not observed.
  • no removal of the dye was observed after washing with pressurized water.

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Abstract

The invention relates to a surface primer with light color and conductivity suitable for use in the application of base coat and top coat paints to automotive plastic surfaces by the electrostatic method, comprising single-walled carbon nanotube dispersion as a component.

Description

A SURFACE PRIMER WITH LIGHT COLOR AND ELECTRICAL CONDUCTIVITY FOR APPLICATION TO AUTOMOTIVE PLASTIC SURFACES
TECHNICAL FIELD
The invention relates to a surface primer with light color and electrical for applying base coat and top coat paints to automotive plastic surfaces by the electrostatic method.
BACKGROUND
Plastics are organic polymeric materials that are solid at room temperature and can be shaped and molded by pressure, temperature, mechanical and chemical means. It is ensured that it can be used in a wide variety of sectors by shaping plastics. One of the areas where plastics are used is the automotive industry.
Plastic surfaces used in the automotive sector can be TPO (PP/EPDM) based buffer surfaces, all kinds of plastic surfaces to be applied electrostatic base coat/top coat inside and outside the vehicle, etc. It is ensured that the painting process is applied on the plastic surfaces used in the automotive sector. Since plastic surfaces are not conductive like metals, it is not possible to apply the paint on these surfaces by electrostatic method.
Conductive primers are used in the current art to apply paint to plastic surfaces used in the automotive industry. These conductive primers have a conductivity feature with the carbon black component they contain in their structure. For the conductive primer to have sufficient conductivity, the amount of carbon black used must be between 6% and 12% by weight. The carbon black used in this value causes the conductive primer to be very dark.
The conductive primer produced by another method known in the present art contains a multi-walled carbon nanotube known as graphite. The multi-walled carbon nanotube component used in the conductive primer should be used at 5% by weight to provide the desired level of conductivity. The use of this ratio of the multi-walled carbon nanotube component causes the conductive primer to be black and/or dark gray. All the problems mentioned above have made it necessary to make an innovation in the relevant technical field as a result.
BRIEF DESCRIPTION OF THE INVENTION
The present invention relates to a surface primer with light color and electrical conductivity for the application of base coat and top coat paints to automotive plastic surfaces by electrostatic method.
The main object of the invention is to provide a surface primer that provides the conductive property of the automotive plastic surfaces in the primer layer and allows the application of the base coat and top coat paints to be applied to it by electrostatic method.
Another object of the invention is to provide a surface primer with light color.
Another object of the invention is to provide a surface primer with electrical conductivity.
In order to achieve all the aforementioned objectives, the present invention is a surface primer with light color and electrical conductivity suitable for use in the application of base coat and top coat paints to automotive plastic surfaces by electrostatic method, comprising single-walled carbon nanotubes as components.
In the preferred embodiment, the surface primer comprises the single-walled carbon nanotube component at most 1% by weight. Preferably, the surface primer comprises the single-walled carbon nanotube component in the range of 0.1% to 1% by weight.
Preferably the single-walled carbon nanotube in the surface primer is dispersed in at least one plasticizer and/or at least one stabilizer.
The possible embodiment of the invention is that the surface primer comprises an acrylic resin component in the range of 20% to 30% by weight.
The possible embodiment of the invention is that the surface primer comprises a wetting component in the range of 0.2% to 1 .5% by weight. The possible embodiment of the invention is that the surface primer comprises a white pigment component in the range of 14% to 20% by weight.
The possible embodiment of the invention is that the said white pigment component of the surface primer is in rutile type form.
The possible embodiment of the invention is that the surface primer comprises a rheology additive component in the range of 0.2% to 1% by weight.
The possible embodiment of the invention is that the rheology additive component of the surface primer is in the form of clay.
The possible embodiment of the invention is that the surface primer comprises at least one solvent component in the range of 50% to 60% by weight.
The possible embodiment of the invention is that the surface primer comprises a singlewalled carbon nanotube dispersion in the range of 0.1% to 1% by weight; an acrylic resin in the range of 20% to 30% by weight; a wetting agent in the range of 0.2% to 1 .5% by weight; a white pigment in the range of 14% to 20% by weight; a rheology additive in the range of 0.2% to 1% by weight; and at least one solvent component in the range of 50% to 60% by weight.
DETAILED DESCRIPTION OF THE INVENTION
In this detailed description, a surface primer of the invention with light color and electrical conductivity for applying base coat and top coat paints to automotive plastic surfaces by the electrostatic method is explained with examples that do not have any limiting effect only for a better understanding of the subject.
In the invention, the term "primer" refers to a chemical mixture that adheres to the surface it is applied, covers the scratches and mold defects on the surface, and provides a homogeneous surface.
In the invention, the term "base coat" refers to the paint layer that gives the color and visual effect expected from the paint applied on the primer layer. With the varnish layer applied on the base coat layer, the paint application gamut with protection and decorative features is completed.
In the invention, the term "top coat" refers to the paint layer applied to protect the surface and give it a decorative appearance. The alternative to the base coat/varnish application gamut is top coat paint.
In the invention, the "electrostatic method" is the process of applying electrically charged paint particles to a material grounded with the help of compressed air.
In the invention, the term "light colored" refers to the surface being provided in a bright form by absorbing a large part of the light falling on the painted surface. The CIE L*a*b* color values and 3-D color coordinates are listed below: L* - Lightness coordinate (L* =0 indicates black and L* =100 is white), a* - is red/green coordinate, +a* indicates red, - a* indicates green, b* - is the yellow/blue coordinate and +b* indicates yellow, -b* indicates blue.
In the invention, the term "conductive" refers to the situation where electrical current and/or heat is allowed to pass through the surface.
One of the innovative aspects of the invention is that it enables the application of surface primer to automotive plastic surfaces, ensures the application of base coat and top coat paints by electrostatic method, distributes homogeneously, and has light color and electrical conductivity.
The surface primer of the present invention comprises at least one component for obtaining the desired performances. The surface primer of the present invention preferably comprises multiple components.
The surface primer of the present invention comprises a single-walled carbon nanotube (to be abbreviated as SWCNT) as a component to provide electrical conductivity. As is known in the art, the single-walled carbon nanotube component of the invention is a single-rounded graphene layer.
The SWCNT component in the surface primer of the present invention is in the range of 0.1% to 1% by weight. The SWCNT component ensures that the surface primer has the desired light color and electrical conductivity thanks to its use in the proportions determined in the surface primer.
The SWCNT component in the surface primer of the present invention is preferably dispersed in the plasticizer and/or stabilizer.
The surface primer of the present invention comprises an acrylic resin component. The acrylic resin component is located to provide the paint-binding properties of the surface primer.
The acrylic resin within the surface primer is preferably in the form modified by the CPO chemical compound. Here, the term CPO is the abbreviation of the chlorinated polyolefin compound. The acrylic resin is preferably modified with the CPO chemical compound, allowing the primer of the invention to adhere to low-energy surfaces.
The acrylic resin contained in the surface primer is preferably in the form modified by the CPO chemical compound, as well as in the form of hydroxy-function. Since the surface primer with the configurations mentioned in the invention contains free hydroxyl groups, it is used by combining with an aliphatic isocyanate hardener before application. Polyurethane bonds are formed after the reaction with the hardener. Polyurethane bonds increase the chemical, mechanical, and water resistance of the product.
The acrylic resin component in the surface primer of the present invention is in the range of 20% to 30% by weight. The presence rates of the acrylic resin component for the surface primer of the invention are critical, allowing the acrylic resin component in the specified weight ratios to adhere strongly to the surface of the product of the invention.
The surface primer of the present invention comprises at least one wetting component. Wetting agents are added to the surface primer in very small amounts and show very important effects during manufacturing, storage, application of surface primer, and improvement of surface primer film character. The wetting agent also increases the brightness of the surface primer. The wetting component used in the surface primer of the present invention is a high molecular weight copolymer. The wetting component in the surface primer of the present invention is in the range of 0.2% to 1.5% by weight. For the surface primer of the invention, the wetting component has critical weight ratios, and the wetting component in the specified weight ratios must ensure the stable distribution of SWCNT grains in the product.
The surface primer of the present invention comprises at least one white coloring pigment component. Pigments are finely powdered inorganic and organic compounds used in the production of various surface primers due to their color. Pigments are used to provide color and coverage in the surface primer. Covering directly depends on the difference between the refractive index of the pigment and the refractive index of the varnish. As the refraction index of the pigment grows, its coverage is strengthened. The white pigment component is added to provide light color within the surface primer. The rutile type form compound is used as the white pigment component used in the surface primer of the present invention. As is known, the rutile form is a form of TiOs, in which the term rutile form refers also to the TiOs compound. The refractive index of rutile pigment is higher than other species. This ensures that the covering of the primer used is strengthened. The white pigment component in the surface primer of the present invention is in the range of 14% to 20% by weight. The white pigment weight ratios determined by the present inventors are critical for obtaining the desired light colored surface primer.
The surface primer of the present invention comprises at least one rheology additive component. The rheology additive component used in the surface primer of the present invention is in clay form. The rheology additive component in the surface primer of the present invention is in the range of 0.2% to 1% by weight.
The surface primer of the present invention comprises at least one solvent component. The solvent components used in the surface primer of the present invention preferably comprise one of the aromatic based and/or acetate compounds or a mixture thereof. Solvents allow adjustment of the surface primer viscosity. The solvents also facilitate the application of the surface primer to the surface by enabling the resin to be made into a solution. The solvent components in the surface primer of the present invention are in the range of 50% to 60% by weight.
Table 1. Representation of the weight ratios of the raw materials within the surface primer.
Figure imgf000007_0001
Figure imgf000008_0001
When Table 1 is examined, it is seen that the surface primer of the present invention is obtained as a result of the mixture of acrylic resin, wetting agent, white pigment, SWCNT dispersion, rheology additive, and solvents in predetermined weight ratios.
The surface primer obtained with the formulation given in the invention has the desired color and electrical conductivity values.
The surface primer with the configurations mentioned in the invention provides a conductivity of <500 kQ when applied at a dry film thickness of 4 to 10 microns. This conductivity level enables the application of a base coat and/or top coat on the primer by electrostatic method.
The primer of the invention is light gray and the L value is > 68.
In order to obtain the surface primer with the configurations mentioned in the invention, the components must be dispersed in good order. SWCNT dispersion is the most important component that must be dispersed for the production of the surface primer of the present invention. By dispersing the SWCNT dispersion component well, it can have the desired electrical conductivity values. The dispersion process is provided by a mixer. For the quality of the dispersion to be high, parameters such as the geometry of the mixing knife, the boiler diameter ratio, the blade diameter ratio, the mixing time, etc. must be adjusted in appropriate proportions. It is preferred to use the cowless type agitator for the production of the surface primer of the present invention. It is preferred to use the boiler diameter/stirrer diameter ratio in the range of 3/1 to 2/1 for the production of the surface primer of the present invention. It is preferred that the mixing time for the production of the surface primer of the present invention is around 20 minutes. It is preferred that the tip speed for the production of the surface primer of the present invention is in the range of 12 to 18 meters/second. After premixing, the dispersion quality is increased by passing it through the zirconium bead-containing crushing machine. It is preferable to provide a crushing fineness of approximately 15 microns in the crushing machine for the production of the surface primer of the present invention. The paint gamut is applied to automotive plastic surfaces in such a way that the following steps are carried out. The surface primer with the configurations mentioned in the invention is applied to the PP-based buffer surface after flame etching. A base coat is applied approximately 5 to 10 minutes after the application of the surface primer. The base coat is applied at a value in the range of 10 to 20 microns. Varnish is applied approximately 10 to 15 minutes after base coat application. Varnish is applied at a value in the range of 25 to 40 microns. After applying the varnish application, the baking process is applied at 80eC for 30 minutes.
Some tests are applied to evaluate the paint gamut obtained as a result of the processes applied at the ratios specified above.
TESTS
The tests in which the paint gamut formed as a result of applying the surface primer described in the description and then the layers applied by the electrostatic method on automotive plastic surfaces are evaluated are explained below.
The components and values given in Table 1 are used as samples in the tests, and the total weight ratio of the whole product is equal to 100%.
Humidity Test
A humidity test in accordance with ASTM D 4585 standards was applied to the top-coated plastic surfaces obtained by the electrostatic method before and after the application of the surface primer. According to the results, no blister was observed in the paint even after 500 hours of the samples with surface primer applied, and no adhesion loss was experienced.
Washing Test with Pressurized Water
The surface primer was washed with pressurized water on the top-coated plastic surfaces obtained by the electrostatic method before and after the application.
Pressurized water washing tests are applied at 11 .3 l/min flow rate and 60eC. Pressure water washing tests are performed at a distance of 16.5 cm and 90e. The washing test with pressurized water was performed on the Karcher HDS 10/20-4 M machine for approximately 1 minute.
As a result of the washing test with pressurized water, no opening in the paint was observed.
Thermal Shock Test
Thermal shock tests were applied to the top-coated plastic surfaces obtained by the electrostatic method before and after the application of the surface primer. It was applied at 105eC for 15 hours, for 30 minutes at ambient temperature at -40eC for 8 hours, and for 30 minutes at ambient temperature. A thermal shock test was applied for 3 cycles. As a result of the said applications, no removal of the dye was observed after washing with pressurized water.
Thermal Aging Test
After the application of the surface primer, thermal aging was applied to the top-coated plastic surfaces obtained by the electrostatic method. In the thermal aging test, aging was applied at 80eC for about 10 days. As a result of the thermal aging test, adhesion loss was not observed. In addition, no removal of the dye was observed after washing with pressurized water.
The scope of protection of the invention is specified in the attached claims and cannot be limited to those explained for sampling purposes in this detailed description. It is evident that a person skilled in the art may exhibit similar embodiments in light of the above-mentioned facts without drifting apart from the main theme of the invention.

Claims

CLAIMS A surface primer with light color and electrical conductivity suitable for use in the application of base coat and top coat paints to automotive plastic surfaces by the electrostatic method, comprising single-walled carbon nanotubes as components. A surface primer according to claim 1 , characterized in that the single-walled carbon nanotube component is at most 1% by weight. A surface primer according to claim 1 , characterized in that it comprises a singlewalled carbon nanotube component in the range of 0.1 to 1% by weight. A surface primer according to any one of the preceding claims, characterized in that the single-walled carbon nanotube is dispersed in at least one plasticizer and/or at least one stabilizer. A surface primer according to claim 1 , characterized in that it comprises an acrylic resin component in the range of 20% to 30% by weight. A surface primer according to claim 1 , characterized in that it comprises a wetting component in the range of 0.2% to 1 .5% by weight. A surface primer according to claim 1 , characterized in that it comprises a white pigment component in the range of 14% to 20% by weight. A surface primer according to claim 1 , characterized in that the said white pigment component is in rutile type form. A surface primer according to claim 1 , characterized in that it comprises a rheology additive component in the range of 0.2% to 1% by weight. A surface primer according to claim 1 , characterized in that the said rheology additive component is in the form of clay. A surface primer according to claim 1 , characterized in that it comprises at least one solvent component in the range of 50% to 60% by weight. A surface primer according to any one of the preceding claims, characterized in that it comprises a single-walled carbon nanotube dispersion in the range of 0.1% to 1% by weight; an acrylic resin in the range of 20% to 30% by weight; a wetting agent in the range of 0.2% to 1 .5% by weight; a white pigment in the range of 14% to 20% by weight; a rheology additive in the range of 0.2% to 1% by weight; and at least one solvent component in the range of 50% to 60% by weight.
PCT/TR2022/051200 2022-09-14 2022-10-27 A surface primer with light color and electrical conductivity for application to automotive plastic surfaces WO2024058734A1 (en)

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TR2022/014241 2022-09-14
TR2022/014241A TR2022014241A2 (en) 2022-09-14 2022-09-14 A SURFACE PRIMER WITH LIGHT COLOR AND ELECTRICAL CONDUCTIVITY FOR APPLICATION TO AUTOMOTIVE PLASTIC SURFACES

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104403397A (en) * 2014-11-26 2015-03-11 东风商用车有限公司 Carbon nano tube composite primer for vehicle and preparation and use methods thereof
CN107573779A (en) * 2017-09-27 2018-01-12 芜湖春风新材料有限公司 A kind of CNT electrostatic spraying priming paint, preparation method and applications
WO2022115004A1 (en) * 2020-11-30 2022-06-02 Михаил Рудольфович ПРЕДТЕЧЕНСКИЙ Priming composition for creating a light electrically conductive priming coating
EP4032621A1 (en) * 2019-09-20 2022-07-27 Kansai Paint Co., Ltd Aqueous white conductive primer coating composition and method of forming multilayered coating film using same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104403397A (en) * 2014-11-26 2015-03-11 东风商用车有限公司 Carbon nano tube composite primer for vehicle and preparation and use methods thereof
CN107573779A (en) * 2017-09-27 2018-01-12 芜湖春风新材料有限公司 A kind of CNT electrostatic spraying priming paint, preparation method and applications
EP4032621A1 (en) * 2019-09-20 2022-07-27 Kansai Paint Co., Ltd Aqueous white conductive primer coating composition and method of forming multilayered coating film using same
WO2022115004A1 (en) * 2020-11-30 2022-06-02 Михаил Рудольфович ПРЕДТЕЧЕНСКИЙ Priming composition for creating a light electrically conductive priming coating

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