Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
  • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
  • B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
  • B29C35/041—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using liquids
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
  • B60S1/00—Cleaning of vehicles
  • B60S1/02—Cleaning windscreens, windows or optical devices
  • B60S1/04—Wipers or the like, e.g. scrapers
  • B60S1/32—Wipers or the like, e.g. scrapers characterised by constructional features of wiper blade arms or blades
  • B60S1/38—Wiper blades
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J3/00—Processes of treating or compounding macromolecular substances
  • C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J3/00—Processes of treating or compounding macromolecular substances
  • C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
  • C08J3/247—Heating methods
• • 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
  • B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
• • 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
  • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
  • B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
  • B05D7/02—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
  • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
  • B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
  • B29C35/041—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using liquids
  • B29C2035/042—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using liquids other than water
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
  • B29C71/02—Thermal after-treatment
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2021/00—Use of unspecified rubbers as moulding material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2033/00—Use of polymers of unsaturated acids or derivatives thereof as moulding material
  • B29K2033/04—Polymers of esters
  • B29K2033/12—Polymers of methacrylic acid esters, e.g. PMMA, i.e. polymethylmethacrylate
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
  • B29L2031/00—Other particular articles
  • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
  • B29L2031/305—Wipers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
  • B60S1/00—Cleaning of vehicles
  • B60S1/02—Cleaning windscreens, windows or optical devices
  • B60S1/04—Wipers or the like, e.g. scrapers
  • B60S1/32—Wipers or the like, e.g. scrapers characterised by constructional features of wiper blade arms or blades
  • B60S1/38—Wiper blades
  • B60S2001/3898—Wiper blades method for manufacturing wiper blades
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2307/00—Characterised by the use of natural rubber
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2311/00—Characterised by the use of homopolymers or copolymers of chloroprene
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
  • C08J2483/04—Polysiloxanes

Definitions

• the present invention relates to a method for producing a shaped article, in particular a vulcanized rubber molded article, for example a wiper blade or a gasket.
• the vulcanization of rubber moldings requires heat over a certain period of time.
• the heat is often applied by immersing the rubber molding in an indirect heat transfer medium, for example, a salt bath of one or more molten alkali metal nitrite and / or alkali metal nitrate salts.
• Alkali nitri-alkali metal nitrate salt melts are characterized in particular by a low melting range of 138-142 ° C, a high heat capacity and a high thermal conductivity.
• Alkali nitrile-alkali metal nitrate salt melts have a density of 1.9 kg / dm 3 to 2.0 kg / dm 3 , which is higher than the density of conventional rubber moldings, namely from 1.0 kg / dm 3 to 1, 5 kg / dm 3 , is. For this reason, rubber moldings tend to float on the melt and must be forced to submerge in the molten salt. However, this is on the one hand mechanically complex and on the other hand associated with the risk of deformation of the rubber profiles.
• nitrosamines contained in the rubber molding containing components such as vulcanization accelerators, UV stabilizers and heat stabilizers react to nitrosamines.
• alkali nitrite-alkali metal nitrate molten salts are classified as toxic and dangerous to fire due to their nitrite content in many European countries.
• the permissible nitrite content of waste water within the countries of the European Union currently varies greatly and must be observed when disposing of it.
• alkali nitrite-alkali metal nitrate salt melts absorb carbon dioxide, causing alkali carbonate to precipitate out of the melt at low temperatures. Since this can lead to deterioration of the vulcanization products and interruptions of the vulcanization process, the alkali carbonate content must be constantly monitored.
• the present invention is a process for producing a shaped body, in particular a vulcanized molded body, for example a rubber molded body, for example for sliding contact applications, which comprises the process steps:
• a silicone bath is understood in particular to mean a (dip) bath which comprises a silicone fluid.
• the silicone bath in the context of the present invention serves as, in particular indirect, heat transfer medium.
• silicone baths have the advantage that they do not have the aforementioned disadvantages of alkali nitrite-alkali metal nitrate salt melts.
• many silicone baths can advantageously be heated to temperatures of about 300 ° C.
• silicone baths generally have a lower or similar density than moldings to be treated, which is why moldings generally do not have to be forced by the application of a mechanical force for immersion in the silicone bath. This in turn has the advantage that a deformation of the shaped body during immersion can be avoided.
• the use of a heated silicone bath furthermore has the advantage that silicone molecules can be adsorbed on the surface of the shaped body during immersion in the silicone bath and / or can be partially or completely bound into a boundary layer of the shaped body close to the surface.
• the water-repellent properties, the anti-adhesion properties and the sliding properties of the molded article can be continuously improved and the coefficient of friction of the molded article can be reduced persistently.
• step b) heat can be transferred to the shaped body during immersion in the silicone bath, through which the vulcanizable material of the shaped body is vulcanized. Therefore, the molding in step b) can be immersed in the silicone bath to vulcanize the vulcanizable material of the molding.
• silicone baths Compared to hot air, silicone baths have the advantage of a higher heat transfer and a more uniform heat action, due to which the molded body can be vulcanized faster and more uniformly than by the use of hot air. In addition, the molded body is protected by the silicone bath from damage by oxygen.
• rubber moldings for example of natural rubber, chloroprene rubber, ethyl Propylene-diene rubber (EPDM), ethylene-propylene rubber (EPM), and blends thereof which have comparable non-stick properties and water repellency properties as vulcanized silicone rubbers, without sacrificing the disadvantages associated with vulcanized silicone rubbers; such as high material costs, long vulcanization times and high requirements on the extrudability, which require the use of reinforcing agents to obtain the mold.
• EPDM ethyl Propylene-diene rubber
• EPM ethylene-propylene rubber
• the method comprises between method steps a) and b) the method step:
• thermosetting coating on the surface of the molding.
• thermosetting coating may be a thermosetting lubricious coating, especially a thermosetting lubricating varnish.
• lubricious coatings are often used to reduce the coefficient of friction of wiper blades and sliding window seals.
• the coating can be applied by applying a solvent-containing, in particular aqueous, coating composition to the surface of the shaped body and then removing the solvent by drying.
• the silicone bath can then be used to induce the polymerization of monomers and / or monomer adducts in the coating composition and / or the crosslinking of polymer chains in the coating composition.
• silicone molecules can be adsorbed on the surface of the coating and / or incorporated in a near-surface boundary layer of the coating partially or completely, chemically and / or physically.
• the water-repellent properties and the non-stick properties of the coating can be improved and the coefficient of friction of the coating can be reduced.
• heat can be transferred to the coating during immersion in the silicone bath, by which the coating is cured. Therefore, the molding in step b) can also be immersed in the silicone bath to cure the thermosetting coating.
• the coating can advantageously be hardened faster by the use according to the invention of a silicone bath than by the use of hot air.
• a more uniform heat effect on the coating can be achieved than by the use of hot air.
• the molded body and the coating are protected by the silicone bath from damage by oxygen. Insofar as the shaped body is not vulcanized prior to immersion in the silicone bath in process step b) or is vulcanized only partially in process step a1), the vulcanizable material can be simultaneously vulcanized in process step b) and the coating cured.
• the method between method steps a) and bO) or between method steps a) and b) comprises the method step:
• silicone molecules can be adsorbed on the surface of the shaped body in process step b) and into a boundary layer of the shaped body near the surface partially or completely, chemically and / or physically integrated, whereby the water-repellent Improved properties and the non-stick properties of the molding and the coefficient of friction of the molding can be reduced.
• the vulcanizable material can be vulcanized and the coating cured simultaneously in process step b)
• a better connection of the coating to the molding can be achieved.
• step b) the coating can optionally be cured with the incorporation of silicone molecules.
• the molding is therefore, if process step a1) is carried out, only partially vulcanized in process step a1).
• the temperature of the heated silicone bath and the immersion time that is, the period over which the rubber molded body is immersed in the silicone bath are dependent on the rubber material of the molded body and the mold, the molded body and / or the material of the coating and the layer thickness of the coating.
• the silicone bath may be heated in process step b), for example to a temperature of at least 150 ° C., in particular of at least 180 ° C., for example of at least 200 ° C.
• the immersion time over which the shaped body is immersed in the silicone bath is in a range from> 0.5 min to ⁇ 10 min, in particular from> 0.5 min to ⁇ 6 min , for example from> 0.9 min to ⁇ 3 min, and / or the silicone bath has a temperature in a range from> 150 ° C to ⁇ 300 ° C, for example from> 180 ° C to ⁇ 250 ° C, in particular from> 200 ° C to ⁇ 220 ° C, on.
• Such immersion time and silicone bath temperature has been found to be particularly advantageous for producing wiper blades for windshield wipers.
• the silicone bath may comprise both only one silicone and a mixture of two or more silicones.
• the density of moldings of conventional vulcanizable materials is usually in a range of> 1, 0 kg / dm 3 to ⁇ 1, 5 kg / dm 3 at room temperature (20 ° C).
• the silicone bath has a density which is less than or equal to the density of the molded body to be immersed or the vulcanizable material of the molded body to be immersed.
• the silicone bath therefore has a density which is less than or equal to the density of the molded body or the vulcanizable material of the molded body to be immersed, in particular at the temperature to which the silicone bath is heated in process step b) ,
• the density of the silicone bath can advantageously be determined not only by a suitable selection of the silicones for the silicone bath, but also by a suitable silicone bath
• Amount ratio of the silicones of the silicone bath are adjusted to each other.
• the silicone bath at room temperature (20 ° C) has a density in a range of> 0.67 g / cm 3 to ⁇ 1, 15 g / cm 3 , for example of> 0.94 kg / dm 3 to ⁇ 1, 1 1 kg / dm 3 , in particular from> 0.94 kg / dm 3 to ⁇ 1, 00 kg / dm 3 , on.
• This has the advantage that the thawing chen of a shaped body, which at room temperature (20 ° C) has a density in a range of> 1, 00 kg / dm 3 to ⁇ 1, 5 kg / dm 3 , can be simplified.
• the silicone bath at room temperature (20 ° C) has a kinematic viscosity of> 10-10 "6 m 2 -s ⁇ 1 to ⁇ 2000-10 " 6 m 2 -s "1 , for example of> 25-10 "6 m 2 -s " 1 to ⁇ 1000-10 "6 m 2 -s " 1 , in particular of> 50-10 "6 m 2 -s " 1 to ⁇ 500-10 "6 m 2 -s "1 on.
• the silicone bath comprises a phenylmethylpolysiloxane and / or a polydimethylsiloxane (PDMS).
• the silicone bath may be based on a phenylmethylpolysiloxane and / or polydimethylsiloxane.
• the silicone bath may consist of a phenylmethylpolysiloxane and / or polydimethylsiloxane.
• the silicone bath can furthermore include reactive constituents which participate in the vulcanization reaction on the surface of the shaped body or in the hardening reaction on the surface of the coating, in particular by addition reaction with unsaturated ethylene groups, for example isoprene, chloroprene and / or diene groups, include.
• unsaturated ethylene groups for example isoprene, chloroprene and / or diene groups
• the silicone bath in particular in addition to the phenylmethylpolysiloxane and / or polydimethylsiloxane, may comprise at least one functionalized polysiloxane.
• the silicone bath comprises, in particular in addition to the phenylmethylpolysiloxane and / or polydimethylsiloxane, at least one functionalized polysiloxane selected from the group consisting of mercapto-functionalized polysiloxanes, vinyl-functionalized polysiloxanes, hydrogen-functionalized polysiloxanes and mixtures thereof ,
• the silicone bath may comprise at least one functionalized polysiloxane selected from the group consisting of mercapto-functionalized dimethylpolysiloxane, vinyl-functionalized dimethylpolysiloxane, hydrogen-functionalized dimethylpolysiloxane, and mixtures.
• the silicone bath may comprise at least one vinyldimethyl-terminated polydimethylsiloxane and / or at least one vinylmethylsiloxane copolymer, for example one or more of the trade names PS 445, PS 424, PS 255 from United Chemical Technologies, Bristol, PA, USA , distributed products.
• PS445 is a low molecular weight vinyl-terminated dimethylpolysiloxane
• PS424 is a low molecular weight poly (dimethylsiloxane) (7.5%) (methylvinylsiloxane) copolymer
• PS255 is a poly (dimethylsiloxane) (0, 1). 0.3%) (methylvinylsiloxane) high molecular weight copolymer.
• the silicone bath may contain at least one mercapto-functionalized polysiloxane, for example one or both of those sold under the trade names PS 405 and PS 849 by United Chemical Technologies, Bristol, PA , sold products.
• PS 405 is a branched polydimethylsiloxane having mercaptopropyl groups at the branching points and PS 849 a poly (dimethylsiloxane) - (1 -3%) (methylmercaptopropylsiloxane) copolymer.
• the silicone bath may comprise at least one hydrogen-functionalized polysiloxane, in particular dimethylpolysiloxane, for example the product marketed under the trade name PS 120 by United Chemical Technologies, Bristol, PA, USA, include.
• PS 120 is a hydrogen-functionalized dimethylpolysiloxane of low molecular weight.
• the aforementioned vinyl-, mercapto- and hydrogen-functionalized polysiloxanes of vinyl-functionalized polysiloxanes take part in the vulcanization reaction on the surface of the vulcanizable material, which is, for example, natural rubber; Chloroprene rubber; a mixture of natural rubber and
• the vulcanizable material comprises at least one component selected from the group consisting of natural rubber, synthetic rubbers, in particular isoprene rubber, chloroprene rubber, ethylene-propylene-diene rubber (EPDM), ethylene-propylene rubber (EPM), Silicone rubbers, vulcanizable thermoplastic elastomers and mixtures thereof.
• the vulcanizable thermoplastic elastomers may be selected from the group consisting of polydienes such as polybutadiene and / or polyisoprene natural rubber, diene copolymers such as copolymers of butadiene and / or isoprene with other copolymerizable monomers, for example selected from the group consisting of styrene, ⁇ - Methylstyrene, acrylates, methylisopropenyl, ketones, isobutylene, acrylonitrile, unsaturated carboxylic acids and mixtures thereof, halogenated rubbers such as polychloroprene and / or fluorinated rubbers, copolymers of one or more monoolefins with a monomer which adds unsaturated groups to the copolymer, for example Example Ethylene / propylene / dicyclopentadiene terpolymer, sulfur vulcanizable polyurethane rubbers, butyl
• It may be the mixtures of, for example, natural rubber / butadiene-styrene copolymer blends and / or copolymer blends of a saturated copolymer of ethylene and / or propylene with an unsaturated copolymer of ethylene and / or propylene and a monomer containing unsaturated groups in the Copolymer inserts act.
• the vulcanizable material may contain one or more additives, for example, antioxidants, processing aids, plasticizers, vulcanization accelerators, UV stabilizers, heat stabilizers, sulfur, sulfur donors, peroxides, metal oxides such as magnesium oxide, calcium oxide, zinc oxide, organic acids such as stearic acid, and / or Soot.
• additives for example, antioxidants, processing aids, plasticizers, vulcanization accelerators, UV stabilizers, heat stabilizers, sulfur, sulfur donors, peroxides, metal oxides such as magnesium oxide, calcium oxide, zinc oxide, organic acids such as stearic acid, and / or Soot.
• thermosetting coating may in particular comprise one or more polymerizable and / or crosslinkable components, for example a methylated iminomelamine aminoplast, for example hexamethoxymethylmelamine.
• thermosetting coating may comprise one or more, in particular lubricating, fillers, for example graphite.
• the weight of the fillers, particularly graphite, of the thermosetting coating to the weight of the polymerizable and / or crosslinkable components of the thermosetting coating in a ratio in a range of 0.40 to 0.50, in particular 0.45 to 0.48 , for example, from about .46.
• a ratio has proved to be advantageous in order to permanently integrate the graphite particles in the polymer matrix and to achieve excellent abrasion resistance on hydrophobic and hydrophilic glass panes.
• thermosetting coating may comprise one or more thickening agents, for example selected from the group consisting of polyacrylates, cellulosic polymers, vinyl acetate-maleic acid copolymers, styrene-maleic acid copolymers, hydroxyethylene polymers, polyethylene glycols, hydroxypropylene polymers, polyvinyl alcohols, polyacrylamide and acrylamide copylymers and mixtures of which include.
• thickening agents for example selected from the group consisting of polyacrylates, cellulosic polymers, vinyl acetate-maleic acid copolymers, styrene-maleic acid copolymers, hydroxyethylene polymers, polyethylene glycols, hydroxypropylene polymers, polyvinyl alcohols, polyacrylamide and acrylamide copylymers and mixtures of which include.
• the solvent-containing coating composition for producing the coating in process step bO) at least one solvent selected from the group consisting of glycol ethers, for example butyl glycol and / or diethylene glycol butyl ether (butylcarbitol), 2-methoxypropanol, propylene glycol, ethanol, isopropanol, water and mixtures thereof.
• glycol ethers for example butyl glycol and / or diethylene glycol butyl ether (butylcarbitol), 2-methoxypropanol, propylene glycol, ethanol, isopropanol, water and mixtures thereof.
• the molding in process step a) and / or the immersion in process step b) can be carried out both continuously and discontinuously, in the form of a so-called batch process.
• either process step a) and b) are carried out both continuously or both discontinuously.
• the process steps a) and b) are particularly preferably carried out both continuously.
• the silicone is preferably removed by a technique by which silicone molecules adsorbed on the molding surface or incorporated in a surface boundary layer and / or a coating optionally applied to the molding are not removed or damaged.
• a technique by which silicone molecules adsorbed on the molding surface or incorporated in a surface boundary layer and / or a coating optionally applied to the molding are not removed or damaged.
• the removal of adhering, in particular excess, silicone of the silicone bath by wiping the shaped body with a textile, for example, a cotton fabric or fleece done.
• the method between the method steps b) and c) can comprise the method step cO) cooling the shaped body, in particular to room temperature.
• the method may further include method step d): dividing the shaped article into at least two, in particular a plurality, of molded article parts.
• method step d) dividing the shaped article into at least two, in particular a plurality, of molded article parts.
• wiper blades and / or seals, in particular sliding window seals can be produced by the method according to the invention by first producing a shaped body in the form of a double profile or multiple profile, which is then cut, in particular cut, along the longitudinal axis into two or more individual profiles.
• the shaped body may be a wiper blade for a windshield wiper, for example a motor vehicle, or a seal, in particular for sealing two mutually displaceable elements, for example a sliding window, for example a motor vehicle.
• a wiper blade for a windshield wiper for example a motor vehicle
• a seal in particular for sealing two mutually displaceable elements, for example a sliding window, for example a motor vehicle.
• Example 1 a One of the double profiles extruded from a rubber material having a composition according to Table 1 was immersed for 2 minutes in a silicone bath heated to a temperature of 210 ° C.
• the heat transferred to the double profile by the silicone bath is sufficient to cure the rubber material of the double profile within 2 minutes.
• the rubber material of the double profile was fully vulcanized.
• the surface of the double profile was even and strongly water repellent.
• An adhesive tape applied to the surface of the double profile was easily removed again, which is an indication of good non-stick properties of the surface.
• the double profile was then cut along the longitudinal axis into two individual profiles and mounted on a windshield wiper system.
• the profiles had a uniform wiping behavior without wiping strips.
• One of the two coated double profile pieces was immersed for 2 minutes in a 210 ° C heated, phenylmethylpolysiloxane-based (Dow Corning 510, Dow Corning, Germany) silicone bath.
• the vulcanization of the rubber material was carried out simultaneously with the curing of the coating.
• MEK methyl ethyl ketone
• the double profile was cut along the longitudinal axis into two individual profiles.
• the cut edges showed no damage to the coating and no splintering of the coating from the cut edge.
• the profiles mounted on a windscreen wiper system exhibited uniform wiping behavior without wiping strips.
• the other of the two coated double profile pieces was treated with hot air at a temperature of 150 ° C for 10 minutes in a hot air oven, whereby the coating cured. This resulted in a hardened coating tion with a layer thickness of 4 ⁇ and a composition according to Table 3.
• the cured coating was rubbed with a cotton wool moistened with methyl ethyl ketone (MEK) under the same conditions as in the previous example. After 30 to 40 double rubs, erosion of the coating was observed.
• MEK methyl ethyl ketone
• EPDM Ethylene propylene diene rubber
• One of the double profiles extruded from a rubber material having a composition according to Table 4 was immersed in a silicone bath heated to a temperature of 220 ° C. for 1.4 minutes.
• the heat transferred to the double profile by the silicone bath is sufficient to vulcanize the rubber material of the double profile within 1, 4 minutes. After removing the double profile from the silicone bath and cooling the double profile, the rubber material of the double profile was fully vulcanized. The surface of the double profile was even and strongly water repellent. After rubbing the double profile with a jean, its surface was dry, not greasy and still highly water repellent. An adhesive tape applied to the surface of the double profile was easily removed again, which is an indication of good non-stick properties of the surface.
• the double profile was then cut along the longitudinal axis into two individual profiles and mounted on a windshield wiper system.
• the profiles had a uniform wiping behavior without wiping strips.
• One of the two coated double profile pieces was immersed in a 220 ° C heated, phenylmethylpolysiloxane-based (Dow Corning 510, Dow Corning, Germany) silicone bath for 1.4 minutes.
• the vulcanization of the rubber material was carried out simultaneously with the curing of the coating.
• the cured coating was rubbed with a cotton wool moistened with methyl ethyl ketone (MEK) under the same conditions as in the Comparative Example to determine the degree of cure. Ablation of the coating was not observed even after 150 double rubs.
• MEK methyl ethyl ketone
• the double profile was cut along the longitudinal axis into two individual profiles.
• the cut edges showed no damage to the coating and no splintering of the coating from the cut edge.
• the profiles mounted on a windscreen wiper system exhibited uniform wiping behavior without wiping strips.

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