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WO2008044668A1 - Revêtement en poudre, procédé pour la production d'un matériau revêtu et matériau revêtu - Google Patents

Revêtement en poudre, procédé pour la production d'un matériau revêtu et matériau revêtu Download PDF

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Publication number
WO2008044668A1
WO2008044668A1 PCT/JP2007/069654 JP2007069654W WO2008044668A1 WO 2008044668 A1 WO2008044668 A1 WO 2008044668A1 JP 2007069654 W JP2007069654 W JP 2007069654W WO 2008044668 A1 WO2008044668 A1 WO 2008044668A1
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WIPO (PCT)
Prior art keywords
synthetic resin
powder
carbon precursor
particles
mass
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.)
Ceased
Application number
PCT/JP2007/069654
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English (en)
Japanese (ja)
Inventor
Naomitsu Nishihata
Tatsuya Kawasaki
Kazuhiko Shimizu
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Kureha Corp
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Kureha Corp
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Filing date
Publication date
Application filed by Kureha Corp filed Critical Kureha Corp
Priority to JP2008538722A priority Critical patent/JP5430939B2/ja
Publication of WO2008044668A1 publication Critical patent/WO2008044668A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • C09D5/033—Powdery paints characterised by the additives
    • 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
    • C09D5/031—Powdery paints characterised by particle size or shape
    • 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
    • C09D5/033—Powdery paints characterised by the additives
    • C09D5/034—Charge control agents

Definitions

  • Powder coating method of producing painted article and painted article
  • the present invention relates to a powder coating containing a synthetic resin and a carbon precursor, and more particularly to a powder coating that can be coated on the surface of a substrate to form a semiconductive coating film. Further, the present invention relates to a coated article having a semiconductive coating film using the powder coating and a method for producing the same.
  • ESD Electrostatic discharge: ESD occurs.
  • the current generated during charge transfer generates electrostatic noise, which causes the electronic device to malfunction or causes electrostatic breakdown (ESD breakdown).
  • ESD electrostatic breakdown
  • Such electronic devices include electronic devices.
  • Electronic devices include semiconductor devices such as LSIs, system LSIs, and transistors; electronic components used around semiconductor devices; display devices such as CRTs, ELs, flat panel displays (liquid crystal panels, plasma displays, etc.); printed wiring boards Mechanical parts such as; including
  • a current due to electrostatic discharge generates a large voltage in the circuit to cause breakdown of the circuit.
  • the phenomenon of soft ESD which magnetically destroys semiconductor devices such as LSI, occurs due to the electromagnetic field generated by the discharge current excited by static electricity, and the occurrence of fire and explosion due to the spark at the time of discharge occurs.
  • What can not be neglected as a problem due to electrostatic discharge is the charging phenomenon of the human body due to friction. For example, due to friction between clothes, friction between car seats and clothes, etc., the human body is charged with static electricity. The charged static electricity is discharged when the human body contacts an electronic device.
  • the electrostatic discharge countermeasure technology is particularly attracting attention! /, For example, the semiconductor field, hard disk drive (HDD) field, liquid crystal display field and the like.
  • miniaturization of each component is in progress by high performance, high integration, and high density of electronic devices, and measures against electrostatic breakdown of electronic devices become extremely important issues. There is.
  • a method has been proposed in which a resin member in contact with an electronic device is formed using a resin composition to which a conductive filler is added.
  • the mechanical strength of the resin member may be insufficient, or the types of usable resin materials may be used. There was a problem that was limited.
  • the electronic device when the conductivity of a member in contact with the electronic device is too high, such as a carrier or a cassette manufactured using a metal material, the electronic device having electric shock or current leakage or charging contacts with the member. Sometimes it discharges rapidly and the circuit is broken.
  • the characteristics required of the ESD-compliant member are that the charge transfer rate is relatively slow and it is difficult to charge.
  • the charge transfer rate depends on the surface resistivity of the member.
  • the surface resistivity required for the member is a semiconductive region (electrostatic diffusion region) of 10 5 to 10 13 ⁇ / hole.
  • the unit of surface resistivity is generally expressed in ⁇ , but may be expressed in ⁇ / port. That is, the surface resistivity is a value obtained by dividing the potential gradient in the direction parallel to the current flowing along the surface of the test piece by the current per unit width of the surface. This value is equal to the surface resistance between two electrodes whose sides are the opposite sides of a square of 1 cm on each side. Therefore, conventionally, the unit of surface resistivity may be expressed by ⁇ / mouth, and in the present invention, the unit of surface resistivity is expressed by ⁇ / mouth.
  • a method of forming a semiconductive coating film on the surface of a resin member or a metal member can be considered. That is, by forming a coating film having a surface resistivity of 10 5 to 10 13 ⁇ / hole on the surface of the member, the charge transfer rate is controlled to prevent electrostatic breakdown.
  • a paint to which a conductive filler such as conductive carbon black, carbon fiber or metal fiber is added it is conceivable to use a paint to which a conductive filler such as conductive carbon black, carbon fiber or metal fiber is added.
  • paints containing conductive fillers have problems such as environmental pollution due to volatilization of the solvent, scratches on the surface resistivity of the coating, and falling particles from the coating!
  • the solution type paint contaminates the environment because the organic solvent volatilizes at the time of forming a coating film.
  • Coatings containing conductive carbon black which is a typical conductive filler, have difficulty in controlling the surface resistivity of the coating film within a desired range depending on the amount of conductive carbon black, structure, and dispersion state.
  • there are large variations in surface resistivity depending on the location Coatings with large variations in surface resistivity due to location are likely to be charged by friction V, sites and rapid charge transfer tend to occur, and sites are mixed, and electrostatic breakdown occurs from these minute areas. Sfc.
  • a general purpose conductive filler such as conductive carbon black is added to control the surface resistivity of the coating film to a semiconductive region because the volume resistivity of the conductive filler is too small. You need to reduce the amount. However, when the amount of conductive filler added is reduced, the formed coating film will have a variation in surface resistivity. The conductive filler significantly changes the surface resistivity of the coating film even with a slight change in the addition amount. When the addition amount of the conductive filler is increased, the conductivity of the coating becomes high, and a coating having a desired surface resistivity of the semiconductive region can not be obtained. [0014] Furthermore, an important problem in paints containing a conductive filler is that the amount of falling off powder from the coating is extremely high.
  • the conductive carbon black or metal powder tends to fall off. These dropped powders cause contamination of electronic devices such as semiconductor devices, short circuits of minute circuits, and performance degradation of electronic devices.
  • Patent Document 1 a composition for conductive coating containing carbon fibers finely divided into powders of lO ⁇ m or less and a synthetic resin as main components is disclosed. It is disclosed.
  • this coating composition has problems such as volatilization of the solvent and generation of falling off powder.
  • JP-A-61-148702 (patent document 2), a treatment agent comprising a binder resin, carbon black and a solvent is applied on a substrate, and an electroconductive agent obtained by applying an overcoat treatment agent thereon.
  • a treatment agent comprising a binder resin, carbon black and a solvent is applied on a substrate, and an electroconductive agent obtained by applying an overcoat treatment agent thereon.
  • this conductive material has problems such as control of the surface resistivity of the coating film, suppression of variations in surface resistivity depending on the place, and volatilization of the solvent. Further, in the method described in Patent Document 2, it is necessary to form an overcoat layer.
  • the average particle diameter is 2 to; Further, there is disclosed a fluorocarbon resin powder paint containing conductive carbon black and carbon fiber powder. Since the fluorocarbon resin powder coating does not use a solvent, it uses a conductive carbon black that alleviates the environmental pollution problem at the time of coating film formation, so control of the surface resistivity of the coating film and the location thereof are carried out. It is difficult to suppress the variation caused by the problem and there is also the problem of falling off powder.
  • JP-A-54-56640 (patent document 4) has carbon black dispersed in particles of a thermoplastic polymer and has an adhesive coating of carbon black on the surface of the particles. Fine particles are disclosed. This fine particle is used as a toner in electrostatic copying It is
  • JP-A-61-283624 discloses polymer particles in which fine particles treated with a coupling agent are attached to the surface of a polymer core having an average particle diameter of 0.7 to 300 111. It is described that a pigment such as carbon black is used as the fine particles.
  • the polymer particles are used for toners, paints, inks, carriers and the like.
  • Japanese Patent Application Laid-Open No. 63-93346 discloses synthetic resin microspheres obtained by a suspension polymerization method, and a coloring agent such as carbon is added to the synthetic resin microspheres. Containing is also described.
  • the synthetic resin microspheres are used for applications such as magnetic powder, powder coating, toner and the like.
  • Patent Document 7 Japanese Patent Application Laid-Open Nos. 2002-69334 (Patent Document 7) and 2002- 69379 (Patent Document 8) disclose inventions relating to a method of producing a powder coating, and carbon black as a black pigment is disclosed. It is also described to contain.
  • Patent Documents 4 to 8 contain carbon black, when used as a powder coating, the control of the surface resistivity of the coating film and the location change it. It is difficult to suppress variation, and there is also the problem of falling off powder. Furthermore, if a large amount of carbon black is contained, black contamination is likely to occur in the electronic device due to the contact with the coating film.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 4 180972
  • Patent Document 2 Japanese Patent Application Laid-Open No. 61-148702
  • Patent Document 3 Japanese Patent Application Laid-Open No. 62-227967
  • Patent Document 4 Japanese Patent Application Laid-Open No. 54-56640 (US Patent No. 4, 158, 634)
  • Patent Document 5 Japanese Patent Application Laid-Open No. 61-283624
  • Patent Document 6 Japanese Patent Application Laid-Open No. 63-93346
  • Patent Document 7 Japanese Patent Application Laid-Open No. 2002-69334
  • Patent Document 8 Japanese Patent Application Laid-Open No. 2002-69379
  • An object of the present invention is to solve the problem of environmental pollution due to volatilization of solvents such as resin materials and metal materials.
  • solvents such as resin materials and metal materials.
  • it When coated on the surface of a member formed of various materials, it has excellent surface smoothness, has a desired surface resistivity of a semiconductive region, and can form a coating film with extremely low falling off powder! To provide powder coatings.
  • Another object of the present invention is to form a coating film in which electrostatic discharge and electrostatic breakdown of the electronic device are significantly suppressed when the coating film is formed on the surface of a member used in contact with the electronic device. It is in providing a powder coating that can be
  • Another object of the present invention is to provide a method for producing a coated article in which a semiconductive coating film is formed by coating a powder coating having such excellent properties on the surface of an article to be coated, and It is an object of the present invention to provide a coated article having the semiconductive coating film.
  • the inventors of the present invention have found that, in a powder coating containing a synthetic resin and a conductive filler, the carbon content is 85 to 97 mass% as a conductive filler.
  • a carbon precursor with a volume resistivity of 1 X 10 to 1 X 10 8 ⁇ ⁇ ⁇ ⁇ (1 X 10 3 to 1 X 10 10 Q-cm) and specifying a synthetic resin and a carbon precursor I thought of a powder paint that was incorporated in proportions.
  • the form of the powder coating of the present invention includes a powder mixture of synthetic resin particles and carbon precursor particles, synthetic resin composition particles containing a synthetic resin and carbon precursor, or a mixture of these.
  • the powder coating of the present invention does not use a solvent, and therefore does not cause environmental pollution due to the volatilization of the solvent.
  • the powder coating of the present invention can preferably form a semiconductive coating having a surface resistivity of 1 ⁇ 10 8 to 1 ⁇ 10 13 ⁇ / hole.
  • the coating film formed by using the powder coating material of the present invention can control the surface resistivity precisely, and also has extremely few falling-off powder which is small in variation of the surface resistivity depending on the place.
  • the coating film can also impart properties such as chemical resistance and corrosion resistance to the object to be coated.
  • the powder coating of the present invention can be coated on the surface of an object to be coated by a fluid immersion method, a thermal spraying method or an electrostatic powder spraying method to form a semiconductive coating film. The present invention has been accomplished on the basis of these findings.
  • a powder coating comprising a synthetic resin and a conductive filler
  • the conductive filler has a carbon content of 85 to 97% by mass and a volume resistivity of 1 to 10 It is a carbon precursor of X 10 8 Q-m (1 X 10 3 to 1 X 10 10 Q-cm),
  • the content of the synthetic resin and the carbon precursor is 60 to 95% by mass of the synthetic resin and 5 to 40% by mass of the carbon precursor, and
  • Synthetic resin composition particles comprising a synthetic resin composition containing a synthetic resin and a carbon precursor and having an average particle diameter of 10 to 300 m, or
  • a method of producing a coated article characterized in that the above-mentioned powder coating is applied to the surface of an object to be coated to form a semiconductive coating film. Furthermore, according to the present invention, there is provided a coated article having a semiconductive coating film formed by the coating of the powder coating.
  • the present invention when it is applied to the surface of a member formed of various materials such as resin materials and metal materials which are free from environmental pollution due to volatilization of the solvent, the surface smoothness is excellent and a desired semiconductive region is obtained.
  • the present invention provides a powder coating which can have a surface resistivity of less than 10% and can form a coating film with extremely low falling off powder.
  • a coating film when a coating film is formed on the surface of a member used in contact with an electronic device, a coating film in which electrostatic discharge and electrostatic breakdown of the electronic device are significantly suppressed is formed. it can.
  • a method of producing a coated article for forming a semiconductive coating film by coating a powder coating having such excellent properties on the surface of a coated article, and the semiconductive A paint having a coating film is provided.
  • the powder coating of the present invention can be applied not only to the fields of electrostatic discharge and electrostatic destruction of electronic devices, but it can be used for antistatic prevention, electrostatic prevention, radio wave interference prevention, dust adsorption prevention, It can be used to coat various articles in a wide range of technical fields that require surface characteristics such as conductivity imparting and surface resistivity of a semiconductive region.
  • the conductive filler has a carbon content of 85 to 97% by mass, and a volume resistivity of 1 ⁇ 10 to 1 ⁇ 10 8 Qm (1 ⁇ 10 3 to 1 ⁇ 10 1. ⁇ ′ cm.
  • the carbon precursor of) is used.
  • Carbon type conductive FILLER one such as a conductive carbon black and graphite, generally, a carbon content of force 9 mass% or more, a volume resistivity 1 X 10_ 4 ⁇ 'm ( l X 10_ -cm 2 ⁇ ) degree
  • very small conductive fillers which are different from the carbon precursors used in the present invention.
  • the true density of the carbon precursor used in the present invention is usually 1.20 to 1.60 g / cm 3 .
  • the carbon precursor used in the present invention can be obtained by firing an organic substance at a temperature of 400 to 900 ° C. in an inert atmosphere.
  • Such carbon precursors may be heated, for example, (1) petroleum tar, petroleum pitch, coal tar, coal pitch, and other pitches and tars to carry out aromatization and polycondensation, if necessary, A method of oxidizing in an oxygen atmosphere in an oxygen atmosphere and further heating and calcining in an inert atmosphere; (2) a thermoplastic resin such as polyacrylonitrile or polyvinyl chloride is insolubilized in an oxygen atmosphere; (3) A method of heating / baking in an inert atmosphere after heat curing of a thermosetting resin such as phenol resin or furan resin; and the like.
  • carbon content is 85 to 97% by mass, and carbonization is completely achieved to obtain a carbon precursor // a carbon precursor.
  • the carbon content of the resulting fired body increases as the firing temperature increases.
  • the carbon content of the carbon precursor can be easily controlled by properly setting the firing temperature.
  • the carbon content of the carbon precursor used in the present invention is in the range of 85 to 97% by mass. When the carbon content of the carbon precursor is too low, the volume resistivity is increased, and it becomes difficult to make the surface resistivity of the obtained coating film 1 ⁇ 10 13 ⁇ / hole or less.
  • the volume resistivity of the carbon precursor is lXlOlX loSQ .mdXloS lXlC ⁇ Q'cm) 1 ⁇ 10 2 ⁇ ; 1 ⁇ 10 7 ⁇ ⁇ ⁇ (1 ⁇ 10 4 ⁇ ; 1 ⁇ 10 9 ⁇ -cm), more preferably 1 ⁇ 10 2 ⁇ ; 1 ⁇ 10 6 ⁇ ⁇ ⁇ (1 ⁇ 10 4 ;; 1 ⁇ 10 8 ⁇ ′ cm).
  • the volume resistivity of the carbon precursor is in the above range, it is possible to form a coating film having a desired surface resistivity and a small variation in surface resistivity depending on places.
  • the shape of the carbon precursor is granular, flake-like, rod-like, amorphous or the like, and is preferably non-fibrous.
  • the average particle size of the carbon precursor is preferably 5 to 100 m, more preferably 10 to 75 111, and still more preferably 15 to 30 111. If the average particle size of the carbon precursor is too large, the unevenness of the coating film may increase during powder coating, or dispersion of surface resistivity may occur due to poor dispersion, which is not preferable. When the average particle diameter of the carbon precursor is in the above range, a good coating film can be obtained S in terms of surface properties, surface resistivity, suppression of falling off powder, and the like.
  • Coating film thickness (or preferably (or 20 to 2000 ⁇ m, more preferably (or 30 to 500 ⁇ m, particularly preferably 40 to 300 111).
  • the upper limit of the maximum particle diameter of the carbon precursor is The lower limit value of the minimum particle diameter of the carbon precursor is also related to the amount of the separated powder, and is preferably about 1 am in view of the film thickness.
  • the average particle diameter of the carbon precursor is 10 to 75 111
  • the content of particles having a particle diameter of 106 m or more is 5% by mass or less
  • the particles having a particle diameter of 4.7 or less are The content is preferably 10% by mass or less.
  • the average particle diameter of the carbon precursor is 15 to 30 m
  • the content of particles having a particle diameter of 75 m or more is 5% by mass or less
  • the content of particles having a particle diameter of 4.7 m or less is It is preferable that it is 8 mass% or less.
  • the particle size distribution of the carbon precursor is such that the content of particles 4 or more times the average particle diameter is 5% by mass or less, and the content of particles 1 ⁇ 4 or less of the average particle diameter is 8 mass It is preferable to be less than%.
  • the synthetic resin used in the present invention is preferably one suitable for powder coating, and specific examples thereof include polyamide, polyacetal, thermoplastic polyester (polybutylene terephthalate, polyethylene terephthalate etc.), polyethylene (high Density polyethylene, low density polyethylene Tyrene, linear low density polyethylene, ultra low density polyethylene etc.), polypropylene, polyisobutylene, polyisoprene, polybutene, poly p-xylene, poly chloride, poly vinylidene chloride, polycarbonate (PC), modified polyphenylene ether, Polyurethane, Polydimethyl siloxane, Poly acetate bur, Polystyrene, Methyl polyacrylate, Methyl poly methacrylate, ABS resin, Polyphenyl sulfonic acid (PPS), Polyether ether ketone (PEEK), Polyether ketone, Polyphenyl sulfonic acid ketone Polyphenylene rufidosulfone, polyether di
  • heat flowable fluororesin examples include tetrafluoroethylene / hexafluoropropylene copolymer (FEP), tetrafluoroethylene / perfluoroalkyl ether copolymer (PFA), Polychlorotrifluorethylene, polyvinylidene fluoride (PVDF), fluorinated biidene / hexafluoropropylene / tetrafluoroethylene copolymer, polyvinyl fluoride, ethylene / tetrafluoroethylene copolymer Polymer (ETFE), Ethylene / Cloper Trifluoroethylene Copolymer, Propylene / Tetrafluoroethylene Copolymer, Tetrafluorofluoroethylene / Perfluoroalkylperfluorovinylone Ether Copolymer , Vinylidene fluoride / hexafluoropropylene copolymer, vinylidene fluoride / he
  • thermoplastic resin PEEK, PPS, PEI, PC, fluorocarbon resin (FEP, PFA, ETFE, etc.), acrylic resin (polymethyl methacrylate, polymethyl acrylate, etc.) are preferable as the thermoplastic resin.
  • FEP fluorocarbon resin
  • PFA polymethyl acrylate
  • ETFE ETFE
  • acrylic resin polymethyl methacrylate, polymethyl acrylate, etc.
  • thermosetting resin An epoxy resin is preferred as the thermosetting resin.
  • acrylic resin and Powder coatings made of epoxy resin and epoxy resin are excellent in preventing electrostatic breakdown and chemical resistance while suppressing the generation of falling powder, and in the case where the object to be coated is a metal material, it is effective in preventing corrosion. It is possible to form a coating that can impart properties.
  • a fluorine resin it is also excellent in releasability, so it is preferable to form a surface layer such as a fixing roller, a pressure roller, and a developing roller, which are disposed in an image forming apparatus such as an electrophotographic copying machine. It is possible to obtain body paint S.
  • the form of the powder coating of the present invention is
  • Synthetic resin composition particles comprising a synthetic resin composition containing a synthetic resin and a carbon precursor and having an average particle diameter of 10 to 300 m, or
  • the average particle diameter of the synthetic resin particles is preferably 10 to 300 111, preferably 20 to 250 111. More preferably, it is 30 to 200 m.
  • the synthetic resin particles are thermoplastic resin particles
  • the synthetic resin particles having a desired particle diameter can be prepared by pulverizing and classifying as necessary.
  • thermosetting resin particle When the synthetic resin particle is a thermosetting resin particle, a synthetic resin particle having a desired particle diameter is prepared by pulverizing an uncured thermosetting resin and classifying it as required. can do. Crushing and classification of the thermosetting resin is preferably performed at a temperature lower than the curing temperature of the thermosetting resin! /. If the melt viscosity of the uncured thermosetting resin is too low, it may be partially cured before and after the grinding step to maintain the particle shape. Therefore, the uncured thermoplastic resin particles include partially cured (semi-cured) thermosetting resin particles which are not completely cured thermosetting resin particles alone.
  • the carbon precursor can be adjusted to a desired particle size by grinding and classifying as necessary. The preferred average particle size of the carbon precursor is as described above.
  • the form of the powder coating of the present invention is a synthetic resin composition particle having an average particle diameter of 10 to 300 m, which is a synthetic resin composition containing a synthetic resin and a carbon precursor, a thermoplastic resin It is possible to adopt a method of melt-kneading the carbon precursor and the carbon precursor, pulverizing the obtained kneaded product, and classifying as required.
  • the carbon precursor was dispersed by a method of mixing one or more kinds of polymerizable monomers forming the thermoplastic resin and the carbon precursor, and subjecting the obtained polymerizable monomer composition to suspension polymerization. Synthetic resin composition particles can be synthesized.
  • the synthetic resin is a thermosetting resin
  • the uncured thermosetting resin and the carbon precursor are melt-kneaded under temperature conditions at which the thermosetting resin does not substantially cure, and the obtained kneading is performed
  • the synthetic resin composition particles can be prepared by pulverizing the material and classifying it as necessary.
  • the melt viscosity of the thermosetting resin is too low, it may be partially cured at the time of melt-kneading. Therefore, the uncured thermosetting resin also includes a partially cured thermosetting resin which is not completely cured.
  • the average particle diameter of the synthetic resin composition particles is preferably 10 to 300 m, more preferably 20 to 250/111, and still more preferably 30 to 200/111. In many cases, by using synthetic resin composition particles having an average particle diameter of about 30 to 100 ⁇ m, it is possible to obtain a coating film having excellent properties.
  • the powder coating of the present invention is usually in the form of a powder mixture of synthetic resin particles and carbon precursor particles, and synthetic resin composition particles containing a synthetic resin and a carbon precursor, It may be a mixture of these if desired.
  • the powder coating composition of the present invention can contain various additives such as a curing accelerator, a filler, a colorant, a lubricant, and an interface modifier, as required.
  • the various additives are independently added to the synthetic resin particles or the synthetic resin composition particles, if desired, as desired.
  • thermosetting resin When the powder coating of the present invention is applied to an object to be coated with low heat resistance such as a synthetic resin member, it is preferable to use a low temperature curing type thermosetting resin as the synthetic resin.
  • a thermosetting resin and a thermosetting resin In order to prepare synthetic resin particles or synthetic resin composition particles using a low temperature curing type thermosetting resin, it is necessary to use a thermosetting resin and a thermosetting resin in order to avoid an early thermal curing in the kneader at the time of granulation. Dry mixing with various additives to be added according to the above method, melt-kneading with a kneader, pulverizing, and then adding a curing agent, dry-mixing, and employing a method of pulverizing and classifying this Is desirable.
  • the powder coating of the present invention is a metal material such as iron, aluminum, nickel, titanium, copper, etc .; Group metal alloys, alloys of metals and carbon or silicon, etc .; glass, ceramics such as chinaware; synthetic resin materials; coating on surfaces of objects to be coated (also referred to as members or substrates) it can.
  • the object to be coated may, if necessary, be subjected to pretreatment such as sand blast treatment, etching treatment, primer treatment, etc., in order to improve the adhesion strength with the coating film.
  • the method of applying the powder coating of the present invention is not particularly limited, and various powder coating methods can be employed. Among these, the fluid immersion method, the thermal spraying method, the electrostatic powder spraying method and the like are preferable. As other powder coating methods, there are, for example, a spray scattering method and an electrostatic fluid immersion method.
  • the thermal spraying method is a method of forming a coating film by spraying a material to be coated while melting the powder coating together with high temperature gas.
  • the electrostatic powder spraying method uses a gun that directs the powder coating carried by air to the object to be grounded (the tip of which has a high voltage and the needle electrode is incorporated). It is a method of blowing by As a result, the powder discharged from the gun is charged and attracted to the object to be coated by the force of high voltage and the minute current (corona discharge) flowing from the gun tip needle electrode toward the object to be coated. A coated powder layer is formed. Then, bake this applied powder layer
  • the spraying temperature is Although different depending on the type, in the case of a crystalline synthetic resin, it is preferable to carry out in a temperature range of 10 ° C. to 120 ° C. higher than the crystal melting point.
  • an adhesive layer is previously formed on the surface of an object to be coated, and then synthetic resin composition particles containing a synthetic resin and a carbon precursor are prepared.
  • the coating can also be fixed by depositing (powder coating) and then baking.
  • the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer not only uncured liquid or semi-liquid resin such as epoxy resin but also liquid or semi-liquid substance such as amines and ethers may be used. Force S.
  • the film thickness of the coating film formed using the powder coating material of the present invention is preferably 20 to 2000 m, preferably 30 to 500 ⁇ 111, and more preferably 40 to 300 ⁇ 111. If the thickness of the coating is too thin, the smoothness of the coating may be impaired, and pinholes and cracks may be generated locally. When the thickness of the coating film is too thick, in addition to the fact that it takes time to apply, foaming occurs and it becomes difficult to obtain a dense coating film immediately.
  • the behavior of individual carbon precursors in the molten synthetic resin is stable. Force S, uniform and less variation in surface resistivity It is important in forming a coating film.
  • the carbon precursor has a true density of 1.20 to 1.60 g / cm 3 .
  • the density in the molten state of many synthetic resins is 1.;! To 2.2 g / cm 3 .
  • the powder coatings of the present invention containing carbon precursors have stable behavior of the individual carbon precursors in the molten synthetic resin, since their densities overlap or approximate each other. The density in the molten state of the synthetic resin and the true density of the carbon precursor are separately measured.
  • the density in the molten state of the synthetic resin can be measured by measuring the specified volume at the melting temperature and the weight at that time and dividing the weight by the volume.
  • the true density of the carbon precursor is measured by the butanol method according to the method defined in JIS: R7212 (Test method of carbon black).
  • the powder coating of the present invention has a carbon content of 85 to 97% by mass as a conductive filler, and the volume resistivity is 1 ⁇ 10 to 1 ⁇ 10 8 ⁇ ⁇ ⁇ (1 ⁇ 10 3 to 6) Containing a carbon precursor of IX lC ⁇ Q 'cm);
  • the proportion of the carbon precursor is 5 to 40% by mass based on the total amount of the synthetic resin and the carbon precursor. From the viewpoint of reducing the film strength and the amount of falling powder, Preferably, it is 5 to 30% by mass.
  • the ratio of the carbon precursor is too large, the surface smoothness of the coating film is reduced due to the increase in the coating film viscosity at the time of baking. If the ratio of the carbon precursor is too small, the force to lower the surface resistivity of the coating S makes it difficult to control the surface resistivity within the range of 1 ⁇ 10 8 to 1 ⁇ 10 13 ⁇ / port. It becomes difficult to force S.
  • the surface resistivity of the coating film formed using the powder coating of the present invention is preferably 1 ⁇ 10 8 to 10
  • the ratio of the synthetic resin in the powder coating of the present invention is 60 to 95% by mass based on the total amount of the synthetic resin and the carbon precursor. If the proportion of the synthetic resin is too large, the surface resistivity of the coating can not be lowered, and it becomes difficult to obtain a coating having the desired surface resistivity of the semiconductive region S. If the proportion of the synthetic resin is too small, the surface resistivity becomes too low, and it becomes difficult to obtain a coating film having the desired surface resistivity of the semiconductive region. In addition, when the proportion of the synthetic resin is too small, the flowability of the powder coating decreases.
  • the particle size distribution of the sample is measured in accordance with the Japan Industrial Standard JIS: Test method specified in ⁇ 0069! (Sieve of chemical product! /, Divided test method), and is represented in the integrated percentage graph. Next, the point at which the integrated percentage is 50% was read from the graph to give an average particle size.
  • the carbon content of the carbon precursor was measured in accordance with the method for determining carbon and hydrogen specified in the appendix of JIS: 8813 (Coals and cokes-elements analysis method). The unit is mass fraction (%).
  • the surface resistivity is 10 6 ⁇ / mouth or more, according to JIS: K6911, a constant voltage device (manufactured by Kikusui, product name 300-1A type), an ammeter (Keithley product, product name 616), and a sample It measured by the applied voltage 100 V using the cell (Yokogawa Hewlett Packard company make, brand name 1608A type
  • the surface resistivity is less than 10 6 ⁇ / mouth, it is measured using Mitsubishi Chemical's Hyrester UP, trade name, in accordance with JIS: K7194.
  • the solution was dropped into an aqueous solution, stirred and dispersed, and cooled to obtain a spherical pitch compact. Further, filtration was performed to remove water, and naphthalene in the pitch compact was extracted and removed with about 6 times volume of n-hexane in the spherical pitch compact.
  • the spherical pitch compact obtained in this manner was oxidized at a temperature of 260 ° C. for 1 hour while passing through heated air to obtain an oxidized pitch.
  • the oxidized pitch was treated in a nitrogen stream at 580 ° C. for 1 hour and then ground to obtain a carbon precursor A.
  • the average particle diameter is ⁇ ⁇ ⁇ ⁇ -10), 25 111 (eight)
  • each carbon precursor A obtained in this manner was 91.0% by mass.
  • the particle size is larger than 100 m! /, The particles are sieved, divided and removed.
  • a spherical pitch compact obtained in the same manner as in the method for producing carbon precursor particles A of Production Example 1 was oxidized at a temperature of 260 ° C. while passing through heated air for oxidation treatment to obtain oxidized pitch.
  • the oxidized pitch was treated in a nitrogen stream at 680 ° C. for 1 hour, and then ground to obtain carbon precursor particles B-25 having an average particle diameter of 25 in.
  • the carbon content of this carbon precursor particle was 95.0% by mass. After the grinding process, large particles were sifted off using a mesh with an opening size of 106 m.
  • the carbon content, the true density, and the volume resistivity of each of the carbon precursor particles obtained above are summarized in Table 1.
  • the carbon contents, true density, and volume resistivity of conductive carbon black (Ketjen black) and graphite are summarized in Table 2.
  • a carbon precursor particle A-25 is prepared from polyether ether ketone (PEEK) having an average particle diameter of 150 am, and carbon precursor particles A-25 having an average particle diameter of 25 in, which are prepared by grinding using a freezing pulverizer.
  • a powder paint was prepared by mixing 5% by mass and PEEK at a mass ratio of 95% by mass. The powder paint was spray-coated on the surface of the sandblasted steel plate with an electrostatic spray device at an applied voltage of 60000 V at a jet amount of the powder paint of 270 g / min. Next, the film was heated and fluidized and baked at 385 ° C. for 20 minutes, and then cooled in the air.
  • a powder coating was prepared in the same manner as in Example 1 except that the mass ratio of each component constituting the powder coating was changed to 10% by mass of carbon precursor particles A-25 and 90% by mass of PEEK. , Made an evaluation. As a result, a smooth coated surface with a film thickness of 23 ( ⁇ 111 is obtained, the surface resistivity of the coating film is stable at 1 x 10 10 to 1 x 10 U Q / mouth, and the amount of falling powder is 200 pieces / It was a small Revenore at cm 3
  • a powder coating was prepared in the same manner as in Example 1 except that the mass ratio of each component constituting the powder coating was changed to 20% by mass of carbon precursor particles A-10 and 80% by mass of PEEK. , Made an evaluation. As a result, a smooth coated surface with a film thickness of 50 ⁇ ⁇ is obtained, and the surface resistivity of the coating film is stable at 1 ⁇ 10 9 to 1 ⁇ 10 ⁇ ⁇ / mouth, and the amount of falling powder is 210 pieces / cm. It was a low level at three . From the comparison with Example 2, even when the film thickness becomes thin, it can be seen that the amount of the falling off powder changes and that!
  • a powder coating was prepared in the same manner as in Example 1 except that the mass ratio of each component constituting the powder coating was changed to 20% by mass of carbon precursor particles A-25 and 80% by mass of PEEK. , Made an evaluation. As a result, a smooth coated surface with a film thickness of 22 ( ⁇ 111 is obtained, the surface resistivity of the coating film is stable at 1 X 10 9 to 1 X 10 ⁇ ⁇ ⁇ / mouth, and the amount of falling powder is 220 pieces / It was a small Revenore at cm 3 .
  • a powder coating was prepared in the same manner as in Example 1 except that the mass ratio of each component constituting the powder coating was changed to 20% by mass of carbon precursor particles A-75 and 80% by mass of PEEK. , Made an evaluation. As a result, a smooth coated film surface with a film thickness of 35 ( ⁇ 111 is obtained, the surface resistivity of the coated film is stable at 1 X 10 9 to 1 X 10 ⁇ ⁇ ⁇ / mouth, and the amount of falling powder is 230 It was a small Revenore at / cm 3 .
  • a powder coating was prepared in the same manner as in Example 1 except that the mass ratio of each component constituting the powder coating was changed to 20% by mass of carbon precursor particles A-25 and 80% by mass of PEEK. And evaluated. As a result, a smooth coated surface with a film thickness of 1000 ⁇ ⁇ is obtained, the surface resistivity of the coating film is stable at 1 ⁇ 10 9 to 1 ⁇ 10 ⁇ ⁇ / mouth, and the amount of falling powder is 200 pieces / cm 3. It was a small Revenore.
  • a powder coating was prepared in the same manner as in Example 1 except that the mass ratio of each component constituting the powder coating was changed to 20% by mass of carbon precursor particles A-25 and 80% by mass of PEEK. , Made an evaluation. As a result, a smooth coated surface with a film thickness of 1800 ⁇ ⁇ is obtained, and the surface resistivity of the coating film is stable at 1 ⁇ 10 9 to 1 ⁇ 10 ⁇ ⁇ / mouth, and the amount of falling powder is 260 particles / cm 3. It was a small Revenore.
  • a powder coating was prepared in the same manner as in Example 1 except that the mass ratio of each component constituting the powder coating was changed to 20% by mass of the carbon precursor particles B-25 and 80% by mass of PEEK. , Made an evaluation. As a result, a smooth coated surface with a film thickness of 25 ( ⁇ 111 is obtained, the surface resistivity of the coating film is stable at 1 x 10 8 ⁇ / mouth, and the amount of falling powder is small at 210 particles / cm 3 Met.
  • a powder coating was prepared in the same manner as in Example 1 except that the mass ratio of each component constituting the powder coating was changed to 30% by mass of the carbon precursor particles A-25 and 70% by mass of PEEK. , Made an evaluation. As a result, a smooth coated surface of film thickness 20 ( ⁇ 111 is obtained, and the surface resistivity of the coating film is stable at 1 x 10 8 to 1 x 10 9 ⁇ / mouth, and the amount of falling powder is 250 pieces / It was a little ⁇ schoolore at cm 3 .
  • a powder coating material As a powder coating material, a tetrafluoromethane / perfluoroalkyl ether copolymer (PFA) with an average particle diameter of 90 am, which was pulverized by a pulverizer, and carbon precursor particles A 25 as carbon powder A powder coating was prepared by mixing precursor particles A-25 in a proportion by mass of 10% by mass and PFA in a proportion of 90% by mass.
  • the powder coating was spray-coated on the surface of the sandblasted steel plate with an electrostatic spray device at an applied voltage of 6000 V at a spray amount of 240 g / min of the powder coating. Then, after heat fluidizing and baking the coating at 380 ° C. for 20 minutes, Cooled in.
  • the coating film thus obtained was subjected to visual surface evaluation, film thickness measurement, surface resistivity measurement, and dropout powder amount measurement.
  • a smooth coated surface with a film thickness of 90 ⁇ 111 is obtained, the surface resistivity of the coating is stable at 1 X 10 U Q / mouth, and the amount of falling powder is small at 180 pcs / cm 3 ! there were.
  • a powder coating is prepared in the same manner as in Example 10, except that the mass ratio of each component constituting the powder coating is changed to 40% by mass of carbon precursor particles A 25 and 60% by mass of PFA. I made an evaluation. As a result, a smooth coated surface of 12 ( ⁇ 111 is obtained, and the surface resistivity of the coating is stable at 1 x 10 8 to 1 x 10 9 ⁇ / mouth, and the amount of falling powder is 280 particles / cm 3 It was a little Le Venore.
  • carbon precursor particles A-25 As a powder coating, carbon precursor particles A-25, a tetrafluoroethylene / hexafluoropropylene copolymer (FEP) with an average particle diameter of 120 m, which was ground by a grinder, and carbon precursor particles A-25, A powder paint was prepared by mixing 10% by mass of 25 and 90% by mass of FEP.
  • the powder coating was spray-coated on the surface of the sand-blasted steel plate by an electrostatic spray device at an applied voltage of 60000 V at a spray amount of 210 g / min of the powder coating. Next, the film was heated, fluidized, and baked at 360 ° C. for 20 minutes, and then cooled in the air.
  • FEP tetrafluoroethylene / hexafluoropropylene copolymer
  • a powder coating was prepared in the same manner as in Example 12 except that the mass ratio of each component constituting the powder coating was changed to 40% by mass of carbon precursor particles A-25 and 60% by mass of FEP. , Made an evaluation. As a result, a smooth coated surface with a film thickness of 110 ⁇ ⁇ is obtained, the surface resistivity of the coating film is stable at 1 ⁇ 10 8 to 1 ⁇ 10 9 ⁇ / mouth, and the amount of falling powder is 270 particles / cm 3. The level was small.
  • a powder coating was prepared by mixing £ at a mass ratio of 90% by mass.
  • the powder paint was spray-coated on the surface of a sandblasted steel plate with an electrostatic spray device at an applied voltage of 60000 V at a spray amount of 230 g / minute of powder paint.
  • the film was heated, fluidized, and baked at 360 ° C. for 20 minutes and then cooled in the air.
  • the coated film was subjected to visual surface evaluation, film thickness measurement, surface resistivity measurement and dropout powder measurement.
  • a smooth coated surface with a film thickness of 100 ⁇ m was obtained, the surface resistivity of the coating film was stable at 1 ⁇ 10 11 ⁇ / mouth, and the amount of falling powder was a small level at 190 particles / cm 3 .
  • a powder coating was prepared in the same manner as in Example 14 except that the mass ratio of each component constituting the powder coating was changed to 40% by mass of carbon precursor particles A-25 and 60% by mass of ETFE. And evaluated. As a result, a smooth coated surface with a film thickness of 110 ⁇ ⁇ is obtained, the surface resistivity of the coating film is stable at 1 ⁇ 10 8 to 1 ⁇ 10 9 ⁇ / mouth, and the amount of falling powder is 270 particles / cm. It was a small Revenore with three .
  • a polycarbonate precursor (PPS) with an average particle diameter of 155 m pulverized by a grinder and carbon precursor particles A-25, carbon precursor particles A-25 in 10% by mass, PPS Were mixed at a mass ratio of 90% by mass to prepare a powder coating.
  • the powder coating was spray-coated on the surface of a sandblasted steel plate with an electrostatic spray apparatus at an applied voltage of 60000 V at a spray amount of 230 g / min of the powder coating.
  • the film was heated and fluidized, baked at 350 ° C. for 20 minutes, and then cooled in the air. With respect to the coating film thus obtained, visual surface evaluation, film thickness measurement, surface resistivity measurement and dropout powder amount measurement were performed.
  • a smooth coated surface with a film thickness of ⁇ ⁇ ⁇ ⁇ is obtained, the surface resistivity of the coating is stable at 10 1Q ⁇ ; 10 U Q / mouth, and the amount of falling powder is a small level at 210 particles / cm 3
  • the surface resistivity of the coating is stable at 10 1Q ⁇ ; 10 U Q / mouth, and the amount of falling powder is a small level at 210 particles / cm 3
  • polyether imide with an average particle diameter of 125 ⁇ m was crushed by a grinder A powder paint was produced by mixing (PEI) and carbon precursor particles A-25 in a mass ratio of 10% by mass of carbon precursor A-25 and 90% by mass of PEI.
  • the powder paint was spray-coated on the surface of the sandblasted steel plate with an electrostatic spray device at an applied voltage of 60000 V at a spray amount of powder paint of 230 g / min.
  • the film was heated and fluidized and baked at 365 ° C. for 20 minutes, and then cooled in the air.
  • surface evaluation by visual observation, film thickness measurement, surface resistivity measurement and dropout powder amount measurement were performed.
  • a smooth coated surface with a film thickness of 100 ⁇ m is obtained, the surface resistivity of the coating is stable at 1 ⁇ 10 1Q to 1 ⁇ 10 U Q / mouth, and the amount of falling powder is 170 / cm 3, which is small. It was a level.
  • PC polycarbonate
  • the powder paint was spray-coated at a spray amount of 210 g / minute of powder paint onto the surface of a sandblasted steel plate with an electrostatic spray device at an applied voltage of 60000V.
  • the coating was heated, fluidized, and baked at 300 ° C. for 20 minutes, and then cooled in the air.
  • surface evaluation by visual observation, film thickness measurement, surface resistivity measurement and dropout powder amount measurement were performed.
  • a smooth coated surface with a film thickness of 140 ⁇ m is obtained, the surface resistivity of the coating is stable at 1 ⁇ 10 1Q to 1 ⁇ 10 U Q / mouth, and the amount of falling powder is 180 / cm 3 and is small. It was a level.
  • the mixture After dry blending of phenolic curing agent and carbon precursor particles A-25 to epoxy resin, the mixture is melt mixed and dispersed (120 ° C) with a twin screw mixer, and cooled and pulverized to obtain an average particle size SO ⁇ m Obtained powder paint.
  • the proportion of each component was 10% by mass of the carbon precursor particles A-25, and 90% by mass of the total amount of the epoxy resin and the curing agent.
  • the powder coating was spray-coated on the surface of a sandblasted steel plate by an electrostatic sprayer at an applied voltage of 60000 V at a spray amount of powder of 230 g / min. Next, the film was heated, fluidized, and baked at 200 ° C. for 15 minutes, and then cooled in the air.
  • the coating film thus obtained was subjected to visual surface evaluation, film thickness measurement, surface resistivity measurement, and powder removal amount measurement.
  • a smooth coated surface with a film thickness of 160 ⁇ 111 is obtained, and the surface resistivity of the coating film was stable at 1 ⁇ 10 10 to 1 ⁇ 10 U Q / mouth, and the amount of falling powder was 170 pieces / cm 3, which is a small level of schoolore.
  • the mixture After curing the curing agent (dodecanedioic acid) and carbon precursor particles A-10 in an acrylic resin, the mixture is melt mixed and dispersed (100 ° C.) with a twin-screw mixer, and cooled and pulverized to obtain an average particle size.
  • a powder coating of diameter ⁇ ⁇ ⁇ was obtained.
  • the proportion of each component was 10% by mass of the carbon precursor particles A-10, and 90% by mass in total of the acrylic resin and the curing agent.
  • the powder coating was spray-coated on the surface of the sandblasted steel plate with an electrostatic spray device at an applied voltage of 60000 V at a spray amount of 230 g / min of the powder coating. Next, the film was heated and fluidized, baked at 180 ° C.
  • the coating film thus obtained was subjected to visual surface evaluation, film thickness measurement, surface resistivity measurement, and dropout powder measurement.
  • a smooth coated surface with a film thickness of ⁇ ⁇ is obtained, the surface resistivity of the coating film is stable at 1 ⁇ 10 10 to 1 ⁇ 10 U Q / mouth, and the amount of falling powder is small at 180 particles / cm 3 Met.
  • a powder coating was prepared in the same manner as in Example 1 except that 20% by mass of conductive carbon black was used instead of 5% by mass of carbon precursor particles A-25 as the conductive filler. . After powder coating of the powder coating, a smooth coated surface with a film thickness of 250 ⁇ 111 was obtained. The surface resistivity of the coating film was in the range of 1 ⁇ 10 3 to 1 ⁇ 10 ⁇ ⁇ / mouth, and the measured values showed large variations depending on the measurement location. The amount of falling powder was as large as 2800 pieces / cm 3 .
  • a powder coating was prepared in the same manner as in Example 1 except that 20% by mass of conductive carbon black was used instead of 5% by mass of carbon precursor particles A-25 as the conductive filler. .
  • the powder coating was powder coated to obtain a smooth coated surface with a thickness of 100.
  • the surface resistivity was in the range of 1 ⁇ 10 3 to 1 ⁇ 10 ⁇ ⁇ / mouth, and the measured values showed large variations depending on the measurement location. As the film thickness became thinner, the amount of falling powder was extremely high at 5800 pieces / cm 3 .
  • a powder coating was prepared in the same manner as in Example 1, except that 20% by mass of graphite was used in place of the 5% by mass of carbon precursor particles A-25 as the conductive filler. After powder coating of the powder coating, a smooth coated surface with a thickness of 230 111 111 was obtained.
  • the surface resistivity of the coating film was in the range of 1 ⁇ 10 3 to 1 ⁇ 10 ⁇ ⁇ / mouth, and the measured value showed a large variation depending on the measurement location.
  • the amount of falling powder was as large as 2200 pieces / cm 3 .
  • a powder coating was prepared in the same manner as in Example 1, except that 20% by mass of graphite was used in place of the 5% by mass of carbon precursor particles A-25 as the conductive filler. After powder coating of the powder coating, a smooth coated surface with a thickness of 100 was obtained. The surface resistivity of the coating film was in the range of 1 ⁇ 10 3 to 1 ⁇ 10 ⁇ ⁇ / mouth, and the measured value showed a large variation depending on the measurement location. As the film thickness decreased, the amount of falling powder increased to 5000 pieces / cm 3
  • PEEK Polyether ether ketone, manufactured by Victrex MC, trade name "PEEK 150 P"
  • ETFE Tetrafluoroethylene / ethylene copolymer
  • PEI Polyetherimide, manufactured by GE Plastics, product name "Ultem 1010"
  • PPS Polyphenylene Russuide, manufactured by Kureha, trade name "Fortron KPS W203J PC: Polycarbonate, manufactured by Teijin Chemicals, trade name" Panlight L-1225 WXJ
  • Epoxy resin made by Yuka Shell Epoxy Co., product name "Epicoat 1004"
  • Phenol curing agent manufactured by Meiwa Chemical Co., Ltd., trade name "DL-92"
  • Conductive carbon black manufactured by Lion, product name "Ketjen Black EC600JDJ
  • the formed coating film has a smooth surface and a small amount of falling off powder with less variation in surface resistivity.
  • Comparative Examples 1 to 4 using a powder coating containing conductive carbon black or graphite it can be seen that the surface resistivity of the coating varies widely, and the amount of dropped powder is also large.
  • the powder coating composition of the present invention can be applied not only to the fields of electrostatic discharge and electrostatic destruction of electronic devices, but it can be used for antistatic prevention, electrostatic prevention, radio wave interference prevention, dust adsorption prevention, It can be used to coat various articles in a wide range of technical fields that require surface characteristics such as conductivity imparting and surface resistivity of a semiconductive region.

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Abstract

L'invention concerne un revêtement en poudre comprenant une résine synthétique et une matière de charge conductrice. Dans le revêtement en poudre, la matière de charge conductrice est un précurseur du carbone ayant une teneur en carbone de 85 à 97 % en masse et une résistivité volumique de 1 x 10 à 1 x 108 Ω•m (1 x 103 à 1 x 1010 Ω•cm). La résine synthétique et le précurseur du carbone sont présents en proportions de 60 à 95 % en masse de la résine synthétique pour 5 à 40 % en masse du précurseur du carbone. Le revêtement en poudre est sous la forme : d'un mélange de poudres comprenant des particules de la résine synthétique ayant un diamètre moyen des particules de 10 à 300 µm et des particules du précurseur du carbone ayant un diamètre moyen des particules de 5 à 100 µm; de particules de composition de résine synthétique comprenant une composition de résine synthétique composée de la résine synthétique et du précurseur du carbone et ayant un diamètre moyen des particules de 10 à 300 µm; ou d'un mélange de ceux-ci. L'invention concerne également un procédé servant à produire un matériau revêtu en utilisant le revêtement en poudre. L'invention concerne en outre un matériau revêtu.
PCT/JP2007/069654 2006-10-10 2007-10-09 Revêtement en poudre, procédé pour la production d'un matériau revêtu et matériau revêtu Ceased WO2008044668A1 (fr)

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WO2014208314A1 (fr) 2013-06-28 2014-12-31 ダイセル・エボニック株式会社 Poudre de résine laminaire et peinture la contenant
US9051476B2 (en) 2010-12-30 2015-06-09 Ticona Llc Powder containing a polyoxymethylene polymer for coating metallic substrates
CN114854252A (zh) * 2022-05-06 2022-08-05 郑斌 一种环保可回收抗热型防水粉末涂料及其制备方法
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CN114854252A (zh) * 2022-05-06 2022-08-05 郑斌 一种环保可回收抗热型防水粉末涂料及其制备方法
CN117304749A (zh) * 2023-10-07 2023-12-29 格林斯达(北京)环保科技股份有限公司 一种乙烯-四氟乙烯共聚物粉末涂料及其制备方法

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