Classifications

• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D13/00—Electrophoretic coating characterised by the process
  • C25D13/22—Servicing or operating apparatus or multistep processes
• • 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
  • C09D5/08—Anti-corrosive paints
  • C09D5/088—Autophoretic paints
• • 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
  • C09D5/44—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for electrophoretic applications
  • C09D5/4488—Cathodic paints
  • C09D5/4496—Cathodic paints characterised by the nature of the curing agents
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
  • C09D7/40—Additives
  • C09D7/65—Additives macromolecular
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D13/00—Electrophoretic coating characterised by the process
  • C25D13/20—Pretreatment
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
  • C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
  • C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
  • C08L27/18—Homopolymers or copolymers or tetrafluoroethene

Definitions

• the invention relates to a method for producing a bonded coating on a workpiece made of steel using a cationic, cataphoretic or autophoretic functional group-containing dipping paint and a dip paint for this purpose.
• Tribologically loaded components such as bearing rings of plain or roller bearings, control pistons of valves, bushings, for example, universal joints and the like must be interpreted increasingly electrically insulating in addition to the friction or rolling load.
• ceramic coatings can be provided if layer deviations are accepted.
• powder coatings and other solid coatings can be provided which do not meet the requirements of uniform, thin layers, for example in the range of 1 to 10 micrometers.
• coating methods are limited to material compositions of the workpiece that include non-inexpensive steels such as 16MnCr5, C45, 100Cr6, 31 CrMoV9, 80Cr2, and the like.
• tribologically advantageous metal-containing carbon layers (aC: Me), which are applied by means of vapor deposition, can not be used because of their electrical conductivity.
• Metal-free carbon layers (aC: H, aC: H: a, ta.C: H, ta-C), in turn, are suitable with regard to their insulating properties and tribological properties, but have inadequate mechanical properties.
• the object of the invention is therefore to propose a method for producing sufficiently solid, thin and reproducible sliding layers and a corresponding coating agent for carrying out the method.
• the proposed method for producing a tribologically advantageous, electrically insulating and sufficient mechanical strength is provided in the form of an electrophoretic dip coating process for producing a bonded coating on a steel workpiece using a cationic, cataphoretic or autophoretic functional group-containing dip coating, wherein the dip paint for Producing the Gleitlacktik with a reduced coefficient of friction a tribologically active pigment is added and the lubricating varnish layer is applied to the workpiece under DC voltage in cationic wiring or by means of an electroless process (ACC) of the workpiece.
• ACC electroless process
• cataphoretic or autophoretic coatings can be provided.
• the tribologically active pigment which at a suitable proportion of, for example, 0.05 to 5 weight percent no disturbance tion of the structure of a binder of Gleitlack für, for example, a plastic resin and the like causes but is housed in the lattice quasi as a lubricant depot.
• the lubricant pigment reduces the actual coefficient of friction of the binder, so that it can be made resistant to abrasion despite a small layer thickness of the sliding layer covering of, for example, 1 to 10 micrometers.
• the tribologically active pigment forming the lubricant pigment can be formed from polytetrafluoroethylene (PTFE) in powder form or, for example, dispersed in water or dilute acid such as acetic acid.
• the lubricant pigment may be accompanied by finely divided boron nitride.
• the particle size of the lubricant pigment is advantageously 5 to 30 micrometers.
• a dispersion of the lubricant pigment can be prepared, for example, from 0.1 to 5% by weight of commercially available CERFLON (®) powder and / or commercially available under treatment on a cathodic dip coating process under the name Algoflon (®) D1223X.
• the pulverulent or preferably dispersed lubricant pigment is admixed, for example with stirring, to a binder dispersion.
• a binder dispersion This can be adjusted for better processability of a dip paint, for example with water and / or acid to a predetermined solids content of, for example, 30% by weight.
• functional groups for example acid radicals, hydroxyl radicals, amino radicals or the like, which can be provided with functional groups of the binder, for example ester and amide groups and the like, can be provided, for example by chemical grafting on the molecular skeleton of the PTFE. chemically crosslink.
• a hardener for example in the form of a silicon dioxide component, for example particles with a small diameter can be introduced into the binder dispersion and optionally anchored with the binder.
• a hardener for example in the form of a silicon dioxide component, for example particles with a small diameter
• it may be provided, for example, to silanize the silicon dioxide component and to produce a chemical compound to functional groups of the binder by means of this silanization.
• the preparation of the dipping paint from the binder dispersion, the lubricant pigment, optionally a curing agent and a coloring color pigment is carried out by setting a predetermined content of this and a predetermined acidic pH by means of water and preferably acetic acid.
• the dip paint produced in this way is preferably aged by stirring, for example, over three days.
• the workpieces can also be silanized in an advantageous manner to achieve better adhesion of the dip or the binder.
• the coating takes place in troughs in which an arrangement of the anodes is preferably designed such that their shape follows the outer spatial surface of the workpiece, so that uniformly small distances between the workpiece connected as a cathode and one or more anodes can be provided.
• the anodes may be coated with titanium or formed from titanium to improve their durability.
• the anode (s) may be formed as provided for flow and return anolyte cells.
• a very homogeneous, thin, bonded coating layer formed from the binder framework can be achieved.
• the lubricant pigment and optionally the hardener and / or color pigment with the binder in the binder dispersion, these are incorporated into the binder framework formed on the surface of the workpiece from the binder and deposited there sufficiently firmly.
• An improvement in the strength of the binder skeleton can be achieved by subsequent firing at for example 175 ° C. over a period of, for example, 20 minutes.
• the dip paint which is advantageous for the proposed process for producing a tribologically active, electrically insulating and abrasion-resistant bonded coating layer consists at least of one of cationic, cataphoretic or non-abrasive coatings. to form a binder resin-containing functional group-forming binder resin in a proportion of at least 36% by weight and at least 2% by weight of tribologically active pigment in an acetic aqueous dispersion.
• lubricant pigment 5-10% by weight of lubricant pigment are mixed with 0.1 to 0.25% by weight of acetic acid (10%) and 3 to 10% by weight of deionized water.
• the resulting mixture is added slowly, for example by means of a dropping funnel to 80 to 90 weight percent of a dispersion of an epoxy resin with respect to function and proportion known extent of cationic, kapadhetically effective functional groups. Thereafter, a setting of a solids content of 30% by weight by means of 3 to 10% by weight of deionized water.
• a commercial, not suitable for a cationic, cataphoretically or autophoretically effective dip coating process PTFE lubricating varnish for example, to produce thick overlays by spraying and the like can be used and modified this to a cationically, cataphoretically or autophoretically effective dipping process accessible dip.
• a commercially available, water-soluble PTFE lubricating varnish Klübertop series from. Klüber Lubrication Kunststoff KG
• 20% by weight of the PTFE bonded coating with 10% by weight of the above-described dispersion of the lubricant pigment of CERFLON (®) powder and / or Algoflon (®) D1223X are mixed slowly and filled with 70% by weight deionized water. It is then acidified with acetic acid (10% to 20%) to a pH value which is advantageous for dip coating.
• Means, for example, 5 microns thick, produced in this way can at Gleitlack Anlagenen frictional forces of 10N / mnn 2 coefficients of friction between 0.1 and 0.2, in particular between 0, 1 and 0.2 hours and scored wear of about 60 minutes to DIN 51834 become.

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

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• 2012
  • 2012-07-24 DE DE102012212981.2A patent/DE102012212981A1/de not_active Withdrawn
• 2013
  • 2013-05-29 WO PCT/EP2013/061034 patent/WO2014016015A2/fr not_active Ceased

Patent Citations (6)

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