EP1023372A1 - Duroplastic molding materials for mold parts which can be electrostatically powder coated and a method for the production and use thereof - Google Patents

Duroplastic molding materials for mold parts which can be electrostatically powder coated and a method for the production and use thereof

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Publication number
EP1023372A1
EP1023372A1 EP98950028A EP98950028A EP1023372A1 EP 1023372 A1 EP1023372 A1 EP 1023372A1 EP 98950028 A EP98950028 A EP 98950028A EP 98950028 A EP98950028 A EP 98950028A EP 1023372 A1 EP1023372 A1 EP 1023372A1
Authority
EP
European Patent Office
Prior art keywords
weight
parts
molding compositions
coke
contain
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98950028A
Other languages
German (de)
French (fr)
Inventor
Reinert Hennersdorf
Edmund Heinrich
Erri Caleffi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mas Engineering Srl
Hexion GmbH
Original Assignee
Raschig GmbH
Mas Engineering Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Raschig GmbH, Mas Engineering Srl filed Critical Raschig GmbH
Publication of EP1023372A1 publication Critical patent/EP1023372A1/en
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
    • C08L61/04—Condensation polymers of aldehydes or ketones with phenols only
    • C08L61/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/045—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field on non-conductive substrates
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
    • C08L61/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
    • C08L61/26—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds
    • C08L61/28—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds with melamine
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
    • C08L61/34—Condensation polymers of aldehydes or ketones with monomers covered by at least two of the groups C08L61/04, C08L61/18 and C08L61/20
    • 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
    • C08K2201/00—Specific properties of additives
    • C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K

Definitions

  • Thermosetting molding compounds for molded parts which can be directly electrostatically powder-coated, processes for their production and their
  • the present invention relates to thermosetting molding compositions for the production of moldings which can be directly electrostatically powder-coated, their production and their use.
  • Electrostatic powder coating in particular powder coating, has been a process that has been known for a long time.
  • the powder coatings are brought to a special "spray gun" using compressed air.
  • the paint particles are negatively charged by the built-in high-voltage generator.
  • the paint particles are applied to the grounded workpiece and are deposited there.
  • the powder layers adhering well to the workpiece are then baked in an oven at temperatures of 150 - 200 ° C within 5 to 25 minutes. Because of the required electrical chargeability of the bodies to be coated and the high baking temperatures of the powder coating systems, the process was initially only used for metallic bodies.
  • plastic parts are often to be coated together with metal parts today (e.g. on-line painting in the automotive industry), it was necessary to modify the plastic parts so that they are also electrostatically chargeable and therefore suitable for powder coating.
  • the molded parts produced from it are sufficiently conductive, temperature-resistant and dimensionally stable to be processed into molded parts which can be powder-coated directly (Kunststoffe 86 (1996), pp. 1162-1164).
  • the metal balls and carbon fibers required are expensive, so that these molding compositions are only suitable for special applications.
  • modified polyphenol ether / polyamide blends with conductive carbon black are described, from which electrically conductive molded parts, such as. B. mudguards for the automotive industry, which are conductive enough to be electrostatically painted. Since the soot particles evenly distributed in the melt are isolated from each other, sufficient conductivity must be generated by percolation (re-agglomeration) of the soot particles into conductive webs which occur above the Vicat softening temperature (plastics 86 (1996), pp. 358-360). The necessary large amounts of conductive carbon black are comparatively expensive and the necessary exact adherence to the manufacturing conditions proves to be disadvantageous.
  • plastic molding compositions are described, from which galvanizable molded parts can be produced. It is believed that these are also suitable for electrostatic powder coating.
  • GB 1, 077.088 describes a plastic molding composition which contains conductive metal particles and conductive non-metallic particles, in particular graphite, and is suitable for electroplating. Since in the production of molded parts from such a mixture the upper layer accumulates in plastic and in particular contains only a few conductive metal particles and graphite, it is necessary for such molded parts to have an outer skin with a thickness of approx. 25 ⁇ m etched or ground off, to expose the conductive inner mass. In order to generate sufficient conductivity, it is proposed that 20 to 70% of the molding composition consist of conductive particles and at least 1%, preferably 35%, of which consist of metal particles. In this process, too, a complex pretreatment of the molded parts is necessary.
  • DE 28 25 735 C2 discloses a process for producing galvanized moldings which are free of metal particles and which consist of a soot-containing thermoplastic synthetic resin.
  • the carbon black used must have an oil absorption of not less than 200 ml / 100 g and a surface area of not less than 500 m 2 / g.
  • the amount of the carbon black is up to 100 parts by weight per 100 parts by weight of thermoplastic synthetic resin. If these regulations are not observed, a direct galvanic coating cannot be obtained. With this method, too, it is necessary, after degreasing, to activate the surfaces in a complex manner by etching with sodium hydroxide solution or chromic acid. The amount of soot to be used also makes the process uneconomical.
  • the so-called press skin is designed so that after degreasing without mechanical or chemical removal of the press skin, a direct electrostatic powder coating is possible and the inexpensive coke dust allows a great reduction in the amount of soot required.
  • Coke in the sense of this invention is understood to mean products obtained in high-temperature coking (900-1400 ° C.), which are also referred to as metallurgical coke, foundry coke or metallurgical coke, gas flame coal or also calcined petroleum dust coke. Depending on their origin, these products contain 0.2 to 10% ash and 90 to 99% carbon.
  • the coke, which is mostly coarse during coking, is ground to grain sizes of 0.01 to 0.3 mm, preferably 0.05 to 0.1 mm.
  • Carbon black is preferably the so-called conductivity carbon black with a specific surface area of approximately 80 to 1200 m 2 / g and an intrinsic conductivity of 0.01 to 0.5 S / cm, preferably 0.05 to 0.1 S / cm. which is also called flame black or furnace black from the production method. Carbon blacks with a higher rate of superficial oxygen and thus lower conductivity are less suitable.
  • the carbon black is composed of primary particles of approximately 30 to 100 nm in size, which in turn are combined to form primary aggregates of approximately 10 to 100 ⁇ m, which hold together relatively tightly and form the secondary aggregates of 0.1 to 2 mm in diameter from the commercially available carbon black powder. The secondary units are easily separated again during processing.
  • coke dust with an average particle size of less than 50 ⁇ m, preferably less than 10 ⁇ m, in particular 1 to 5 ⁇ m, can also be used. This should also fall under the term "soot" in the following.
  • the coke and soot, and, if appropriate, likewise mixed organic or inorganic fillers and, if appropriate, fibrous reinforcing materials are mixed with up to 1% by weight of conventional lubricants such as waxes, Sodium or magnesium stearates or palmitates added.
  • conventional lubricants such as waxes, Sodium or magnesium stearates or palmitates added.
  • a solid polyethylene glycol can be added to the mixture.
  • the mixture of the starting materials is then prepared in a manner known per se by means of calenders, kneaders or extruders to give molding compositions and then granulated.
  • molding compositions are further processed in a known manner by pressing, spraying, injection molding or injection molding to give molded parts, the processing method being practically unchanged compared to non-galvanizable thermosetting compositions.
  • the processability of the molding compositions for the individual molding processes is adjusted via the degree of precondensation of the curable resins, which, for. B. is measured with a torque rheometer.
  • compositions usually contain hardeners or inhibitors, stabilizers against UV light and temperature loads or other processing aids.
  • Organic and inorganic fillers are in particular additives of wood or cellulose flour, inorganic fillers or extenders, in particular calcium carbonate, aluminum oxide, silicon oxide, kaolin, talc or the like, and organic or inorganic pigments.
  • the masses can also be mixed in a known manner with fibrous materials, in particular glass fibers, carbon fibers but also natural fibers such as hemp or jute, in order to increase the mechanical strength.
  • the coke and soot content should be such that the molded parts have a surface resistance of ⁇ 10 6 ⁇ , preferably ⁇ 10 5 ⁇ , so that they can be directly electrostatically powder-coated without the prior application of an electrically conductive primer. Amounts of 5 to 30%, preferably 10 to 20% coke have been found to be sufficient.
  • the proportion of carbon black should be 1 to 20% by weight, preferably 2 to 10% by weight, in order to enable electrostatic powder coating. In special cases, up to 10% by weight, preferably 1 to 5% by weight, of metal powder with grain sizes of 0.01 to 0.3 mm, preferably 0.05 to 0.1 mm, can also be added. Copper, aluminum and iron powder are preferred. Mixtures that are too high have an effect negatively on the strength of the molded parts, the total amount of admixtures should not exceed 80% depending on the respective resin type.
  • the molded parts produced according to the invention only need to be degreased before the electrostatic powder coating in order to remove residues of the mold release agent.
  • An etching of the surface or the application of an additional conductive layer proves to be superfluous, since the molding compositions according to the invention do not produce an insulating press skin on the conductive molded parts during processing.
  • thermosetting molding compounds are suitable as thermosetting plastics, for example diallyl phthalate resins (DAP), epoxy resins (EP), urea formaldehyde resins (UF), melamine formaldehyde resins (MF), melamine phenol formaldehyde resins (MP), phenol formaldehyde unsaturated resins (PF) .
  • DAP diallyl phthalate resins
  • EP epoxy resins
  • UF urea formaldehyde resins
  • MF melamine formaldehyde resins
  • MP melamine phenol formaldehyde resins
  • PF phenol formaldehyde unsaturated resins
  • a molded part is produced from a phenolic resin molding compound of type PF 31 (according to DIN 7708 Part 2) and, after degreasing, subjected to electrostatic powder coating in a conventional powder coating system without further pretreatment.
  • the applied lacquer layer was stained and inhomogeneous; d. H. it did not meet the qualitative requirements.
  • Example 2 After degreasing, the molded part produced analogously to Example 1 was coated with an electrically conductive primer and then treated further as in Example 1. The electrostatically formed paint layer was good.
  • a customary composition of a phenolic resin molding compound (42 parts by weight of phenolic resin novolak, 7 parts by weight of hexamethylenetetramine, 8 parts by weight of wood flour, 30 parts by weight of chalk, 1.0 part by weight of MgO, 0, 4 parts by weight of metal stearates, 0.6 parts by weight of wax-like lubricants), 3 parts by weight of conductive carbon black and 8 parts by weight of coke dust were intimately mixed and then processed to a homogeneous molding composition on a heatable calender or extruder.
  • multi-purpose test specimens type A - ISO 3167; by injection molding according to ISO 10724; conditions according to DIN 7708 part 8) were produced on an injection molding machine. With a measuring distance of 160 mm, these molded parts had an electrical resistance of approx. 900 k ⁇ . The parts were degreased and painted electrostatically, a very good paint layer was formed.
  • a conventional composition of a melamine-phenolic resin molding composition (50 parts by weight of melamine-phenolic resin, 37 parts by weight of cell powder, 0.4 part by weight of metal stearate, 0.6 part by weight of wax-like lubricant) was mixed with 4 parts by weight.
  • Parts of conductive carbon black, 5 parts by weight of coke dust and 8 parts by weight of copper powder mixed intimately and as processed under example 3.
  • the multipurpose test specimens produced by the injection molding process had a measured electrical resistance of approx. 10 k ⁇ and, after degreasing the molded parts, were electrostatically painted without intermediate treatment with a conductive primer to obtain a good paint layer.
  • a usual composition of a free-flowing UP molding compound (20 parts by weight of crystalline unsaturated polyester resin, 2.5 parts by weight of diallyl phthalate, 33 parts by weight of chalk, 15 parts by weight of 6 mm short glass fiber, 0.5 parts by weight of dicumyl - Peroxide, 1 part by weight of metal stearate) were well homogenized with 8 parts by weight of conductive carbon black and 20 parts by weight of metallurgical coke and further treated as in Example 3.
  • the multipurpose test specimens produced by the injection molding process had an electrical resistance of approx. 600 ⁇ with a measuring distance of 160 mm and could be painted well electrostatically after degreasing without further pretreatment.
  • a common composition of an epoxy resin molding compound (20 parts by weight of epoxy resin, 10 parts by weight of epoxy resin hardener, 1 part by weight of hardness catalyst, 43 parts by weight of mineral fillers, 0.4 parts by weight of metal stearate, 0.6 parts by weight) .
  • Parts of wax-like lubricants were intimately mixed with 10 parts by weight of conductive carbon black and 15 parts by weight of coke dust and treated as in Example 3.
  • the multipurpose test specimens produced in the injection molding process had an electrical resistance of approx. 500 ⁇ over a measuring distance of 160 mm and, after degreasing, could be painted well electrostatically without the application of a conductive primer.

Abstract

The invention relates to duroplastic molding materials used to produce mold parts for direct electrostatic powder coating. The molding materials are comprised of hardenable resins, fillers and process materials, whereby the molding materials contain 5-30 wt. % coke with a particle size ≤ 0.3 mm and at least 1-20 wt. % soot. The invention also relates to a method for producing electrostatically powder coated mold parts.

Description

Duroplastische Formmassen für Formteile, welche direkt elektrostatisch pulverbeschichtbar sind, Verfahren zu ihrer Herstellung und ihre Thermosetting molding compounds for molded parts which can be directly electrostatically powder-coated, processes for their production and their
Verwendunguse
Gegenstand der vorliegenden Erfindung sind duroplastische Formmassen zur Herstellung von Formteilen, welche direkt elektrostatisch pulverbeschichtbar sind, ihre Herstellung und ihre Verwendung.The present invention relates to thermosetting molding compositions for the production of moldings which can be directly electrostatically powder-coated, their production and their use.
Die elektrostatische Pulverbeschichtung, insbesondere die Pulveriackierung ist ein seit langem bekanntes Verfahren. Dabei werden die Pulverlacke mit Hilfe von Druckluft zu einer speziellen "Lackierpistole" gebracht. Hier erhalten die Lackteilchen durch den eingebauten Hochspannungsgenerator eine negative Aufladung. Durch das Arbeiten der "Pistole" werden die Lackpartikel auf das geerdete Werkstück aufgebracht und schlagen sich dort nieder. Die gut auf dem Werkstück haftenden Pulverschichten werden anschließend in einem Ofen bei Temperaturen von 150 - 200 °C innerhalb von 5 bis 25 Minuten eingebrannt. Wegen der erforderlichen elektrischen Aufladbarkeit der zu beschichtenden Körper und der hohen Einbrenntemperaturen der Pulverbeschichtungssysteme wurde das Verfahren zunächst nur für metallische Körper verwendet.Electrostatic powder coating, in particular powder coating, has been a process that has been known for a long time. The powder coatings are brought to a special "spray gun" using compressed air. Here, the paint particles are negatively charged by the built-in high-voltage generator. By working the "gun", the paint particles are applied to the grounded workpiece and are deposited there. The powder layers adhering well to the workpiece are then baked in an oven at temperatures of 150 - 200 ° C within 5 to 25 minutes. Because of the required electrical chargeability of the bodies to be coated and the high baking temperatures of the powder coating systems, the process was initially only used for metallic bodies.
Da heute jedoch häufig Kunststoffteile zusammen mit Metallteilen beschichtet werden sollen (z. B. On-Iine-Lackieren in der Automobilindustrie), war es nötig, die Kunststoffteile so zu modifizieren, daß sie ebenfalls elektrostatisch aufladbar und damit für eine Pulverbeschichtung geeignet sind.However, since plastic parts are often to be coated together with metal parts today (e.g. on-line painting in the automotive industry), it was necessary to modify the plastic parts so that they are also electrostatically chargeable and therefore suitable for powder coating.
Dazu ist es bekannt, die Kunststoffteile in einem getrennten Arbeitsschritt mit einem leitfähigen Primer zu grundieren (Kunststoffe 86 (1996), S. 350 - 353). Als solche kommen mit leitfähigen Partikeln wie Metallpulver oder -fasern, Kohlen- stoffasern oder Leitruß dotierte Grundierungen in Frage. Um eine ausreichende Leitfähigkeit zu erhalten, müssen die Primer sehr stark mit den leitfähigen Stoffen versetzt sein, so daß ihre Festigkeit leidet. Da der Primer darüber hinaus in einem Spritzverfahren aufgetragen werden muß, ist die Gleichmäßigkeit der Beschichtung bei komplizierten Formen nur mit Mühe zu erreichen. Eine Alternative bilden Polyamide, die mit leitfähigen Metall- oder Keramikkügel- chen und Kohlenstoffasem dotiert sind. Die daraus hergestellten Formteile sind ausreichend leitfähig, temperaturbeständig und formstabil, um zu direkt pulverlak- kierbaren Formteilen verarbeitet zu werden (Kunststoffe 86 (1996), S. 1162 - 1164). Die benötigten Metallkügelchen und Kohlefasern sind jedoch teuer, so daß diese Formmassen sich nur für spezielle Anwendungen eignen.For this purpose, it is known to prime the plastic parts in a separate step with a conductive primer (Kunststoffe 86 (1996), pp. 350-353). Primers doped with conductive particles such as metal powder or fibers, carbon fibers or conductive carbon black are suitable as such. In order to obtain sufficient conductivity, the primers must be very heavily mixed with the conductive substances so that their strength suffers. Since the primer must also be applied in a spraying process, the uniformity of the coating is difficult to achieve with complicated shapes. An alternative are polyamides that are doped with conductive metal or ceramic beads and carbon fibers. The molded parts produced from it are sufficiently conductive, temperature-resistant and dimensionally stable to be processed into molded parts which can be powder-coated directly (Kunststoffe 86 (1996), pp. 1162-1164). However, the metal balls and carbon fibers required are expensive, so that these molding compositions are only suitable for special applications.
Weiterhin sind mit leitfähigem Ruß modifizierte Polyphenolether/Polyamid-Blends beschrieben, aus denen sich elektrisch leitfähige Formteile, wie z. B. Kotflügel für die Automobilindustrie, fertigen lassen, die genügen leitfähig sind, um elektrostatisch lackiert zu werden. Da die gleichmäßig in der Schmelze verteilten Rußpartikel gegeneinander isoliert sind, muß durch eine Perkolation (Re-agglomera- tion) der Rußteilchen zu leitfähigen Bahnen, welche oberhalb der Vicat-Erwei- chungs-Temperatur zeitabhängig eintritt, eine ausreichende Leitfähigkeit erzeugt werden (Kunststoffe 86 (1996), S. 358 - 360). Die notwendigen großen Mengen an Leitruß sind vergleichsweise teuer und die notwendige genaue Einhaltung der Herstellungsbedingungen erweist sich als nachteilig.Furthermore, modified polyphenol ether / polyamide blends with conductive carbon black are described, from which electrically conductive molded parts, such as. B. mudguards for the automotive industry, which are conductive enough to be electrostatically painted. Since the soot particles evenly distributed in the melt are isolated from each other, sufficient conductivity must be generated by percolation (re-agglomeration) of the soot particles into conductive webs which occur above the Vicat softening temperature (plastics 86 (1996), pp. 358-360). The necessary large amounts of conductive carbon black are comparatively expensive and the necessary exact adherence to the manufacturing conditions proves to be disadvantageous.
Weiterhin sind eine Reihe von Kunststofformmassen beschrieben, aus denen galvanisierbare Formteile hergestellt werden können. Es wird angenommen, daß diese auch für eine elektrostatische Pulverbeschichtung geeignet sind.Furthermore, a number of plastic molding compositions are described, from which galvanizable molded parts can be produced. It is believed that these are also suitable for electrostatic powder coating.
In der GB 1 ,077,088 ist eine Kunststofformmasse beschrieben, welche leitende Metallpartikel und leitende nichtmetallische Partikel, insbesondere Graphit, enthält und für eine Galvanisierung geeignet ist. Da bei der Herstellung von Formteilen aus einer solchen Mischung die Oberschicht sich an Kunststoff anreichert und insbesondere nur noch wenige leitende Metallpartikel und Graphit enthält, ist es erforderlich, daß bei solchen Formteilen eine Außenhaut mit einer Dicke von ca. 25 μm abgeätzt oder abgeschliffen wird, um die leitfähige Innenmasse freizulegen. Um eine ausreichende Leitfähigkeit zu erzeugen, wird vorgeschlagen, daß 20 bis 70 % der Formmasse aus leitfähigen Partikeln bestehen und mindestens 1 %, vorzugsweise 35 %, davon aus Metallpartikeln besteht. Auch in diesem Verfahren ist eine aufwendige Vorbehandlung der Formteile erforderlich. Aus der DE 28 25 735 C2 ist ein Verfahren zur Herstellung metallpartikelfreier, galvanisierbarer Formteile bekannt, welche aus einem rußhaltigen thermoplastischen Kunstharz bestehen. Der verwendete Ruß muß dabei eine Ölabsorption von nicht weniger als 200 ml/100 g und eine Oberfläche von nicht weniger als 500 m2/g aufweisen. Die Menge des Rußes beträgt bis zu 100 Gew.-Teile pro 100 Gew.-Teile thermoplastisches Kunstharz. Werden diese Bestimmungen nicht eingehalten, läßt sich eine direkte galvanische Beschichtung nicht erhalten. Auch bei diesem Verfahren ist es notwendig, nach der Entfettung die Oberflächen durch Ätzen mit Natronlauge oder Chromsäure aufwendig zu aktivieren. Die zu verwendenden Rußmengen machen das Verfahren zusätzlich unwirtschaftlich.GB 1, 077.088 describes a plastic molding composition which contains conductive metal particles and conductive non-metallic particles, in particular graphite, and is suitable for electroplating. Since in the production of molded parts from such a mixture the upper layer accumulates in plastic and in particular contains only a few conductive metal particles and graphite, it is necessary for such molded parts to have an outer skin with a thickness of approx. 25 μm etched or ground off, to expose the conductive inner mass. In order to generate sufficient conductivity, it is proposed that 20 to 70% of the molding composition consist of conductive particles and at least 1%, preferably 35%, of which consist of metal particles. In this process, too, a complex pretreatment of the molded parts is necessary. DE 28 25 735 C2 discloses a process for producing galvanized moldings which are free of metal particles and which consist of a soot-containing thermoplastic synthetic resin. The carbon black used must have an oil absorption of not less than 200 ml / 100 g and a surface area of not less than 500 m 2 / g. The amount of the carbon black is up to 100 parts by weight per 100 parts by weight of thermoplastic synthetic resin. If these regulations are not observed, a direct galvanic coating cannot be obtained. With this method, too, it is necessary, after degreasing, to activate the surfaces in a complex manner by etching with sodium hydroxide solution or chromic acid. The amount of soot to be used also makes the process uneconomical.
Es stellte sich daher die Aufgabe, Formmassen zur Herstellung von Formteilen zur direkten elektrostatischen Pulverbeschichtung zu finden, welche ohne Anätzen und sonstige umständliche Vorbehandlung eine direkte Verwendung zur elektrostatischen Pulveriackierung ermöglichen und sich aus vergleichsweise preiswerten Ausgangsprodukten herstellen lassen.It was therefore the task of finding molding compositions for the production of moldings for direct electrostatic powder coating which, without etching and other cumbersome pretreatment, enable direct use for electrostatic powder coating and which can be produced from comparatively inexpensive starting products.
Die Aufgabe wird durch die Merkmale des Hauptanspruchs und der Nebenansprüche gelöst und durch die Merkmale der Unteransprüche gefördert.The object is achieved by the features of the main claim and the secondary claims and promoted by the features of the subclaims.
Überraschenderweise wurde gefunden, daß durch die Kombination von Leitruß in den Mengen von 1 bis 20 Gew.-%, vorzugsweise 2 bis 10 Gew.-%, und Koks in den Mengen von 5 bis 30 Gew.-%, vorzugsweise 10 bis 20 Gew.-%, beim Einsatz in duroplastischen Formmassen und den daraus hergestellten Formteilen die sogenannte Preßhaut so beschaffen ist, daß nach einer Entfettung ohne mechanische oder chemische Entfernung der Preßhaut eine direkte elektrostatische Pulveriackierung möglich ist und der preiswerte Koksstaub eine starke Reduzierung der benötigten Rußmengen erlaubt.Surprisingly, it was found that the combination of conductive carbon black in the amounts of 1 to 20% by weight, preferably 2 to 10% by weight, and coke in the amounts of 5 to 30% by weight, preferably 10 to 20% by weight .-%, when used in thermosetting molding compounds and the molded parts made from them, the so-called press skin is designed so that after degreasing without mechanical or chemical removal of the press skin, a direct electrostatic powder coating is possible and the inexpensive coke dust allows a great reduction in the amount of soot required.
Obwohl die Wirkung des Kokszusatzes noch nicht abschließend geklärt ist, wird angenommen, daß die körnige und poröse Struktur einer Entmischung entgegenwirkt und dadurch auch in der Oberflächenschicht eine durchgehende Leitfä- higkeit der Kokskörner erhalten bleibt. Der zugesetzte Ruß scheint leitfähige Brücken zwischen den Kokskörnern zu bilden.Although the effect of the coke additive has not yet been conclusively clarified, it is assumed that the granular and porous structure counteracts segregation and thus also a continuous guide in the surface layer. ability of the coke grains is retained. The added soot appears to form conductive bridges between the coke grains.
Unter Koks im Sinne dieser Erfindung werden bei Hochtemperaturverkokung (900 - 1400°C) erhaltene Produkte verstanden, die auch als metallurgischer Koks, Gießereikoks oder Hüttenkoks, Gasflammkohle oder auch calcinierter Petrol- staubkoks bezeichnet werden. Je nach ihrer Herkunft enthalten diese Produkte 0,2 bis 10 % Asche und 90 bis 99 % Kohlenstoff. Der beim Verkoken meist grobstückig anfallende Koks wird auf Korngrößen von 0,01 bis 0,3 mm, vorzugsweise 0,05 bis 0,1 mm, vermählen.Coke in the sense of this invention is understood to mean products obtained in high-temperature coking (900-1400 ° C.), which are also referred to as metallurgical coke, foundry coke or metallurgical coke, gas flame coal or also calcined petroleum dust coke. Depending on their origin, these products contain 0.2 to 10% ash and 90 to 99% carbon. The coke, which is mostly coarse during coking, is ground to grain sizes of 0.01 to 0.3 mm, preferably 0.05 to 0.1 mm.
Unter Ruß wird vorzugsweise der sogenannte Leitfähigkeitsruß mit einer spezifischen Oberfläche von ca. 80 bis 1200 m2/g und einer Eigenleitfähigkeit von 0,01 bis 0,5 S/cm, vorzugsweise 0,05 bis 0,1 S/cm, verstanden, welcher von der Herstellungsweise auch als Flammruß oder Furnaceruß bezeichnet wird. Gasruße mit einer höheren Rate an oberflächlichem Sauerstoff und somit geringerer Leitfähigkeit sind weniger geeignet. Der Ruß setzt sich aus Primärteilchen von ca. 30 bis 100 nm Größe zusammen, die wiederum zu Primäraggregaten von ca. 10 bis 100 μm vereinigt sind, welche relativ fest zusammenhalten und die Sekundäraggregate von 0,1 bis 2 mm Durchmesser des handelsüblichen Rußpulvers bilden. Bei der Verarbeitung werden die Sekundäraggregate leicht wieder aufgetrennt.Carbon black is preferably the so-called conductivity carbon black with a specific surface area of approximately 80 to 1200 m 2 / g and an intrinsic conductivity of 0.01 to 0.5 S / cm, preferably 0.05 to 0.1 S / cm. which is also called flame black or furnace black from the production method. Carbon blacks with a higher rate of superficial oxygen and thus lower conductivity are less suitable. The carbon black is composed of primary particles of approximately 30 to 100 nm in size, which in turn are combined to form primary aggregates of approximately 10 to 100 μm, which hold together relatively tightly and form the secondary aggregates of 0.1 to 2 mm in diameter from the commercially available carbon black powder. The secondary units are easily separated again during processing.
Anstelle von Ruß kann auch ein Koksstaub mit durchschnittlicher Teilchengröße von unter 50 μm, vorzugsweise unter 10 μm, insbesondere 1 bis 5 μm verwendet werden. Dieser soll im folgenden ebenfalls unter den Ausdruck "Ruß" fallen.Instead of soot, coke dust with an average particle size of less than 50 μm, preferably less than 10 μm, in particular 1 to 5 μm, can also be used. This should also fall under the term "soot" in the following.
Um eine gleichmäßige und schnelle Durchmischung mit den härtbaren Harzen sowie eine gute Verarbeitbarkeit zu gewährleisten, werden der Koks und Ruß sowie ggf. ebenfalls untergemischte organische oder anorganische Füllstoffe und ggf. faserförmige Verstärkungsstoffe noch mit bis zu 1 Gew.-% üblichen Gleitmitteln wie Wachsen, Natrium- oder Magnesiumstearaten, oder -palmitaten versetzt. Zur Erhöhung der Hydrophilie kann der Mischung noch von 0,5 bis 3 Gew.-% eines festen Polyethylenglycols zugeführt werden. Die Mischung der Ausgangsmaterialien wird dann in an sich bekannter Weise mittels Kalander, Kneter oder Extruder zu Formmassen aufbereitet und anschließend granuliert.In order to ensure uniform and rapid mixing with the hardenable resins and good processability, the coke and soot, and, if appropriate, likewise mixed organic or inorganic fillers and, if appropriate, fibrous reinforcing materials, are mixed with up to 1% by weight of conventional lubricants such as waxes, Sodium or magnesium stearates or palmitates added. To increase the hydrophilicity, from 0.5 to 3% by weight of a solid polyethylene glycol can be added to the mixture. The mixture of the starting materials is then prepared in a manner known per se by means of calenders, kneaders or extruders to give molding compositions and then granulated.
Diese Formmassen werden in bekannter Weise durch Pressen, Spritzen, Spritz- giessen oder Spritzprägen zu Formteilen weiterverarbeitet, wobei die Verarbeitungsweise gegenüber nicht galvanisierbaren duroplastischen Massen praktisch unverändert ist. Die Verarbeitbarkeit der Formmassen für die einzelnen Formgebungsverfahren wird über den Vorkondensationsgrad der härtbaren Harze eingestellt, der z. B. mit einem Drehmomentrheometer gemessen wird.These molding compositions are further processed in a known manner by pressing, spraying, injection molding or injection molding to give molded parts, the processing method being practically unchanged compared to non-galvanizable thermosetting compositions. The processability of the molding compositions for the individual molding processes is adjusted via the degree of precondensation of the curable resins, which, for. B. is measured with a torque rheometer.
Die Massen enthalten in üblicher weise Härter oder Inhibitoren, Stabilisationsmit- tel gegen UV-Licht und Temperaturbelastung oder andere Verarbeitungshilfsmittel.The compositions usually contain hardeners or inhibitors, stabilizers against UV light and temperature loads or other processing aids.
Als organische und anorganische Füllstoffe sind insbesondere Zusätze von Holzoder Zellulosemehl, anorganische Füllstoffe oder Extender, insbesondere Calciumcarbonat, Aluminiumoxid, Siliciumoxid, Kaolin, Talkum oder ähnliches, sowie organische oder anorganische Pigmente anzusehen. Die Massen können, um die Festigkeit zu erhöhen, in bekannter Weise auch noch mit faserförmigen Materialien, insbesondere Glasfasern, Kohlenstoffasern aber auch Naturfasern wie Hanf oder Jute versetzt sein, um die mechanische Festigkeit zu erhöhen.Organic and inorganic fillers are in particular additives of wood or cellulose flour, inorganic fillers or extenders, in particular calcium carbonate, aluminum oxide, silicon oxide, kaolin, talc or the like, and organic or inorganic pigments. In order to increase the strength, the masses can also be mixed in a known manner with fibrous materials, in particular glass fibers, carbon fibers but also natural fibers such as hemp or jute, in order to increase the mechanical strength.
Der Gehalt an Koks und Ruß sollte so bemessen sein, daß die Formteile einen Oberflächenwiderstand von < 106 Ω, vorzugsweise < 105 Ω, aufweisen, so daß sie ohne vorherige Aufbringung einer elektrisch leitfähigen Grundierung direkt elektrostatisch pulverbeschichtbar sind. Mengen von 5 bis 30 %, vorzugsweise 10 bis 20 % Koks, haben sich als ausreichend erwiesen. Der Rußanteil soll 1 bis 20 Gew.-%, vorzugsweise 2 bis 10 Gew.-%, betragen, um eine elektrostatische Pulverbeschichtung zu ermöglichen. In Sonderfällen kann auch bis zu 10 Gew.-%, vorzugsweise 1 bis 5 Gew.-%, Metallpulver mit Korngrößen von 0,01 bis 0,3 mm, vorzugsweise 0,05 bis 0,1 mm, beigemengt werden. Kupfer, Aluminium und Eisenpulver werden bevorzugt angewendet. Zu hohe Beimengungen wirken sich negativ auf die Festigkeit der Formteile aus, die Gesamtmenge der Beimengungen sollte abhängig von dem jeweiligen Harztypen 80 % nicht überschreiten.The coke and soot content should be such that the molded parts have a surface resistance of <10 6 Ω, preferably <10 5 Ω, so that they can be directly electrostatically powder-coated without the prior application of an electrically conductive primer. Amounts of 5 to 30%, preferably 10 to 20% coke have been found to be sufficient. The proportion of carbon black should be 1 to 20% by weight, preferably 2 to 10% by weight, in order to enable electrostatic powder coating. In special cases, up to 10% by weight, preferably 1 to 5% by weight, of metal powder with grain sizes of 0.01 to 0.3 mm, preferably 0.05 to 0.1 mm, can also be added. Copper, aluminum and iron powder are preferred. Mixtures that are too high have an effect negatively on the strength of the molded parts, the total amount of admixtures should not exceed 80% depending on the respective resin type.
Die erfindungsgemäß hergestellten Formteile brauchen vor der elektrostatischen Pulverbeschichtung lediglich noch entfettet zu werden, um Reste der Formtrennmittel zu entfernen. Eine Abätzung der Oberfläche oder das Aufbringen einer zusätzlichen leitfähigen Schicht erweist sich als überflüssig, da die erfindungsge- mässen Formmassen beim Verarbeiten keine isolierende Preßhaut auf den leitfähigen Formteilen erzeugen.The molded parts produced according to the invention only need to be degreased before the electrostatic powder coating in order to remove residues of the mold release agent. An etching of the surface or the application of an additional conductive layer proves to be superfluous, since the molding compositions according to the invention do not produce an insulating press skin on the conductive molded parts during processing.
Als duroplastische Kunststoffe sind prinzipiell alle technisch wichtigen, gebräuchlichen duroplastischen Preßmassen geeignet, beispielsweise seien genannt Diallylphthalatharze (DAP), Epoxydharze (EP), Hamstofformaldehydharze (UF), Melaminformaldehydharze (MF), Melaminphenolformaldehydharze (MP), Phenolformaldehydharze (PF) und ungesättigte härtende Polyesterharze. Besonders bevorzugt sind Phenolformaldehydharze wegen ihrer Preiswertigkeit, leichten Verarbeitbarkeit und günstigen Produkteigenschaften.In principle, all technically important, customary thermosetting molding compounds are suitable as thermosetting plastics, for example diallyl phthalate resins (DAP), epoxy resins (EP), urea formaldehyde resins (UF), melamine formaldehyde resins (MF), melamine phenol formaldehyde resins (MP), phenol formaldehyde unsaturated resins (PF) . Phenol formaldehyde resins are particularly preferred because of their inexpensive nature, easy processability and favorable product properties.
In den beigefügten Beispielen ist die Erfindung näher beschrieben, ohne daß darin jedoch eine Beschränkung gesehen wird. The invention is described in more detail in the accompanying examples, without however being regarded as a limitation.
BeispieleExamples
Beispiel 1 (Vergleich)Example 1 (comparison)
Aus einer Phenolharz-Formmasse vom Typ PF 31 (nach DIN 7708 Tl. 2) wird ein Formteil hergestellt und nach der Entfettung ohne weitere Vorbehandlung in einer üblichen Pulveriackieranlage einer elektrostatischen Pulveriackierung unterzogen. Die aufgetragene Lackschicht war fleckig und inhomogen; d. h. sie genügte den qualitativen Anforderungen nicht.A molded part is produced from a phenolic resin molding compound of type PF 31 (according to DIN 7708 Part 2) and, after degreasing, subjected to electrostatic powder coating in a conventional powder coating system without further pretreatment. The applied lacquer layer was stained and inhomogeneous; d. H. it did not meet the qualitative requirements.
Beispiel 2 (Vergleich)Example 2 (comparison)
Das analog zu Beispiel 1 hergestellte Formteil wurde nach der Entfettung mit einem elektrisch leitfähigen Primer beschichtet und anschließend wie unter Beispiel 1 weiter behandelt. Die elektrostatisch gebildete Lackschicht war gut.After degreasing, the molded part produced analogously to Example 1 was coated with an electrically conductive primer and then treated further as in Example 1. The electrostatically formed paint layer was good.
Beispiel 3Example 3
Zu einer üblichen Zusammensetzung einer Phenolharz-Formmasse (42 Gew.- Teile Phenolharz-Novolak, 7 Gew.-Teile Hexamethylentetramin, 8 Gew.-Teile Holzmehl, 30 Gew.-Teile Kreide, 1 ,0 Gew.-Teile MgO, 0,4 Gew.-Teile Metallstea- rate, 0,6 Gew.-Teile wachsartige Gleitmittel) wurden 3 Gew.-Teile Leitruß und 8 Gew.-Teile Koksstaub innig gemischt und anschließend auf einen beheizbaren Kalander oder Extruder zu einer homogenen Formmasse verarbeitet. Nach Granulierung der Formmasse wurden auf einer Spritzgießmaschine sogenannte Vielzweckprobekörper (Typ A - ISO 3167; durch Spritzgießen nach ISO 10724; Bedingungen nach DIN 7708 Tl. 8) hergestellt. Diese Formteile hatten bei einer Meßstrecke von 160 mm einen elektrischen Widerstand von ca. 900 kΩ. Die Teile wurden entfettet und direkt elektrostatisch lackiert, es bildete sich eine sehr gute Lackschicht aus.To a customary composition of a phenolic resin molding compound (42 parts by weight of phenolic resin novolak, 7 parts by weight of hexamethylenetetramine, 8 parts by weight of wood flour, 30 parts by weight of chalk, 1.0 part by weight of MgO, 0, 4 parts by weight of metal stearates, 0.6 parts by weight of wax-like lubricants), 3 parts by weight of conductive carbon black and 8 parts by weight of coke dust were intimately mixed and then processed to a homogeneous molding composition on a heatable calender or extruder. After the molding compound had been granulated, so-called multi-purpose test specimens (type A - ISO 3167; by injection molding according to ISO 10724; conditions according to DIN 7708 part 8) were produced on an injection molding machine. With a measuring distance of 160 mm, these molded parts had an electrical resistance of approx. 900 kΩ. The parts were degreased and painted electrostatically, a very good paint layer was formed.
Beispiel 4Example 4
Eine übliche Zusammensetzung einer Melamin-Phenolharz-Formmasse (50 Gew.- Teile Melamin-Phenolharz, 37 Gew.-Teile Zellmehl, 0,4 Gew.-Teile Metallstearat, 0,6 Gew.-Teile wachsartige Gleitmittel) wurde mit 4 Gew.-Teilen Leitruß, 5 Gew.- Teilen Koksstaub und 8 Gew.-Teilen Kupferpulver innig gemischt und wie unter Beispiel 3 weiterverarbeitet. Die im Spritzgießverfahren hergestellten Vielzweckprobekörper hatten einen gemessenen elektrischen Widerstand von ca. 10 kΩ und wurden nach der Entfettung der Formteile ohne Zwischenbehandlung mit leitfähigem Primer unter Erhalt einer guten Lackschicht elektrostatisch lackiert.A conventional composition of a melamine-phenolic resin molding composition (50 parts by weight of melamine-phenolic resin, 37 parts by weight of cell powder, 0.4 part by weight of metal stearate, 0.6 part by weight of wax-like lubricant) was mixed with 4 parts by weight. Parts of conductive carbon black, 5 parts by weight of coke dust and 8 parts by weight of copper powder mixed intimately and as processed under example 3. The multipurpose test specimens produced by the injection molding process had a measured electrical resistance of approx. 10 kΩ and, after degreasing the molded parts, were electrostatically painted without intermediate treatment with a conductive primer to obtain a good paint layer.
Beispiel 5Example 5
Eine übliche Zusammensetzung einer rieselfähigen UP-Formmasse (20 Gew.- Teile kristallines ungesättigtes Polyesterharz, 2,5 Gew.-Teile Diallylphthalat, 33 Gew.-Teile Kreide, 15 Gew.-Teile 6mm Kurzglasfaser, 0,5 Gew.-Teile Dicumyl- peroxid, 1 Gew.-Teile Metallstearat) wurden mit 8 Gew.-Teilen Leitruß und 20 Gew.-Teilen metallurgischem Koks gut homogenisiert und wie in Beispiel 3 weiterbehandelt. Die im Spritzgießverfahren hergestellten Vielzweckprobekörper hatten bei einer Meßstrecke von 160 mm einen elektrischen Widerstand von ca. 600 Ω und ließen sich nach der Entfettung ohne weitere Vorbehandlung gut elektrostatisch lackieren.A usual composition of a free-flowing UP molding compound (20 parts by weight of crystalline unsaturated polyester resin, 2.5 parts by weight of diallyl phthalate, 33 parts by weight of chalk, 15 parts by weight of 6 mm short glass fiber, 0.5 parts by weight of dicumyl - Peroxide, 1 part by weight of metal stearate) were well homogenized with 8 parts by weight of conductive carbon black and 20 parts by weight of metallurgical coke and further treated as in Example 3. The multipurpose test specimens produced by the injection molding process had an electrical resistance of approx. 600 Ω with a measuring distance of 160 mm and could be painted well electrostatically after degreasing without further pretreatment.
Beispiel 6Example 6
Eine übliche Zusammensetzung einer Epoxidharz-Formmasse (20 Gew.-Teile Epoxidharz, 10 Gew.-Teile Epoxidharzhärter, 1 Gew.-Teil Härtekatalysator, 43 Gew.-Teile mineralische Füllstoffe, 0,4 Gew.-Teile Metallstearat, 0,6 Gew.-Teile wachsartige Gleitmittel) wurden mit 10 Gew.-Teilen Leitruß und 15 Gew.-Teilen Koksstaub innig vermischt und wie unter Beispiel 3 weiterbehandelt. Die im Spritzgießverfahren hergestellten Vielzweckprobekörper hatten bei einer Meßstrecke von 160 mm einen elektrischen Widerstand von ca. 500 Ω und ließen sich nach der Entfettung ohne Aufbringung eines leitfähigen Primer gut elektrostatisch lackieren. A common composition of an epoxy resin molding compound (20 parts by weight of epoxy resin, 10 parts by weight of epoxy resin hardener, 1 part by weight of hardness catalyst, 43 parts by weight of mineral fillers, 0.4 parts by weight of metal stearate, 0.6 parts by weight) . Parts of wax-like lubricants) were intimately mixed with 10 parts by weight of conductive carbon black and 15 parts by weight of coke dust and treated as in Example 3. The multipurpose test specimens produced in the injection molding process had an electrical resistance of approx. 500 Ω over a measuring distance of 160 mm and, after degreasing, could be painted well electrostatically without the application of a conductive primer.

Claims

Patentansprüche claims
1. Duroplastische Formmassen zur Herstellung von Formteilen für die direkte elektrostatische Pulverbeschichtung, enthaltend härtbare Harze, Ruß, Füllstoffe und Hilfsstoffe, dadurch gekennzeichnet, daß sie 5-30 Gew.-% Koks mit einer Korngröße < 0,3 mm und 1 bis 20 Gew.-% Ruß enthalten.1. Thermosetting molding compositions for the production of moldings for direct electrostatic powder coating, containing curable resins, carbon black, fillers and auxiliaries, characterized in that they contain 5-30 wt .-% coke with a grain size <0.3 mm and 1 to 20 wt .-% contain soot.
2. Duroplastische Formmassen gemäß Anspruch 1 enthaltend:2. Thermosetting molding compositions according to claim 1 containing:
20 - 60 Gew .-% härtbare Harze20-60% by weight curable resins
5 - 30 Gew.-% Koks5-30% by weight coke
1 - 20 Gew.-% Ruß1 - 20% by weight of carbon black
5 - 50 Gew.-% Füll- und Verstärkungsstoffe5 - 50% by weight fillers and reinforcing materials
0,1 - 5 Gew.-% Hilfsstoffe0.1 - 5 wt .-% excipients
3. Duroplastische Formmassen nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß sie bis zu 1 Gew.-% Gleitmittel und/oder 0,5 bis 3 Gew.-% Poly- ethylenglykol enthalten.3. Thermosetting molding compositions according to claim 1 or 2, characterized in that they contain up to 1 wt .-% lubricant and / or 0.5 to 3 wt .-% polyethylene glycol.
4. Duroplastische Formmassen nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß sie bis zu 10, vorzugsweise 1 bis 5 Gew.-% Metallpulver enthalten.4. Thermosetting molding compositions according to claim 1 to 3, characterized in that they contain up to 10, preferably 1 to 5 wt .-% metal powder.
5. Duroplastische Formmassen nach Anspruch 1 bis 4, dadurch gekennzeichnet, daß sie 10 bis 20 Gew.-% Koks und 2 bis 10, vorzugsweise 3 bis5. Thermosetting molding compositions according to claims 1 to 4, characterized in that they contain 10 to 20% by weight of coke and 2 to 10, preferably 3 to
5 Gew. % Ruß enthalten.Contain 5% by weight of carbon black.
6. Verfahren zur Herstellung von direkt elektrostatisch pulverbeschichteten Formteilen aus duroplastischen Formmassen nach den Ansprüchen 1 bis 5, wobei die härtbaren Harze mit den Füllstoffen, Hilfsstoffen und den Kohlepulvern zu einer einheitlichen Masse vermischt und in üblicher Weise geformt und gehärtet werden, dadurch gekennzeichnet, daß die Formteile nach einer Entfettung direkt elektrostatisch pulverbeschichtet werden. 6. A process for the production of directly electrostatically powder-coated molded parts from thermosetting molding compositions according to claims 1 to 5, wherein the curable resins are mixed with the fillers, auxiliaries and the carbon powders to a uniform mass and shaped and cured in the usual way, characterized in that After degreasing, the molded parts are directly electrostatically powder-coated.
7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß die härtbaren Harze vorpolymerisiert sind.7. The method according to claim 6, characterized in that the curable resins are prepolymerized.
8. Verwendung von duroplastischen Formmassen gemäß Ansprüchen 1 bis 5 zur Herstellung von direkt elektrostatisch pulverbeschichtbaren Formteilen. 8. Use of thermosetting molding compositions according to claims 1 to 5 for the production of directly electrostatically powder-coated moldings.
EP98950028A 1997-09-29 1998-09-12 Duroplastic molding materials for mold parts which can be electrostatically powder coated and a method for the production and use thereof Withdrawn EP1023372A1 (en)

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