Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D183/00—Coating compositions based on 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; Coating compositions based on derivatives of such polymers
  • C09D183/04—Polysiloxanes

Definitions

• the invention relates to the use of solvent-, water- and emulsifier-free preparations for the friction-reducing coating of rubber profiles, comprising a curable siloxane and, as a carrier, low molecular weight volatile siloxanes.
• One of the most frequently used fixing techniques consists in pressing prefabricated profiled seals into the corresponding profiles of supports intended therefor, such as, for example, window frames and door frames.
• the profiled seals are customarily coated on the surfaces with friction-reducing coatings.
• silicones or fluorinated resins are added to the lubricant.
• Coatings of this type firstly have the disadvantage that the silicones are oils, of which it is known that they act as releasing agents. On account of their characteristic substance properties, releasing agents of this type are relatively easily removed and can, for example, lead to difficulties during the installation and in the subsequent coating of frames, vehicle body parts etc. The employment and use of silicone oils which are not firmly bound is therefore not desirable.
• One embodiment of the invention is the use of solvent-, water- and emulsifier-free preparations for the friction-reducing coating of rubber profiles, comprising:
• n is a number from 2 to 10, for the linear compounds and for the cyclic compounds preferably >4, and, if appropriate,
• compositions according to the invention can contain soluble dyes, colored pigments, delustering agents and other customary auxiliaries.
• Preferred delustering agents are those based on silicic acid, a particularly preferred black colored pigment is carbon black.
• the preparations according to the invention are utilizable for the customarily used materials of the sealing profiles such as elastomers made of natural or synthetic materials such as rubber, EPDM.
• the application to the substrates is carried out by the customary processes such as rolling, spreading with a doctor blade and in particular immersing or spraying.
• curable siloxanes (a) which can additionally be used according to the invention and the various curing conditions are described in the literature, in particular also in Walter Noll, “Chemie and TECH der Silikone” [Chemistry and Technology of the Silicones], Verlag Chemie GmbH, Weinheim, 1960.
• cured siloxane products also result from the addition reaction of ⁇ , ⁇ -vinylsiloxanes and hydrogensiloxanes.
• the catalyst used here is, for example, hexachloroplatinic acid.
• RTV room temperature vulcanizable rubber systems
• Constituents of such systems are, for example, alpha,omega-siloxanediols of medium viscosity and, as crosslinkers, for example, methyltriacetoxysilane and also ethoxysilanes.
• These systems can cure using condensation catalysts, such as, for example, dibutyltin dilaurate, to give a migration-stable film.
• alkoxypolysiloxanes and silica esters are also used, which then likewise form cured and elastic films with alpha,omega-siloxanediols.
• dibutyltin dilaurate is used as a condensation catalyst.
• silicic acid esters which can additionally be used as crosslinkers are compounds of the general formula
• R 2 is an alkyl radical, preferably C 1-4 radical, most preferably an ethyl radical and
• c has a value from 1.8 to 4. If the silicic acid ester is present in monomer form, c has the value 4 and falls with increasing degree of polymerization to values smaller than 4.
• carrier (b) low molecular weight silicone oils are used, which firstly assist the lubricant action of the film which is still present in liquid form, but also evaporate later on account of their high volatility.
• n is a number from 2 to 10, for the linear compounds preferably 2 to 5 and for the cyclic compounds preferably >4, particularly 5 and/or 6.
• Cyclic and linear siloxanes can be used on their own or as a mixture with one another, but preferably as a mixture with one another.
• the lubricant formulation has a flashpoint of > about 55° C., whereby the content of very low molecular weight siloxanes is thus limited.
• the lubricant formulation according to a+b according to the invention and, if appropriate, c can be applied in the immersion or spraying process.
• a spray application using extremely fine nozzles is preferred.
• a homogeneous and extremely thin lubricant film results. This firstly remains liquid up to the processing of the coated rubber profile, so that the drawing and sliding into window and door frames is possible without problems.
• the continuously manufactured coated rubber profile is rolled up and packed in plastic films. Using this measure prevents the easily volatile carrier from being able to evaporate prematurely and a not yet desirable curing of the film taking place.
• the silicone film dries so that a grip-resistant migration-stable film remains.
• This film imparts a silky lustrous finish to the rubber profile, at the same time serves as weather protection and can thus also improve the sealing ability of the entire profile.
• the preparation according to the invention was uniformly coated in a spraying chamber through which the EPDM strip was drawn at a rate of 20 m/min.
• the coated EPDM profile was then wound onto a spool. This spool was packed in a polyethylene film and heat-sealed. At a later point in time, this coated rubber profile was drawn into a wooden window frame. A very good lubricant action was discernible.
• This installed rubber profile was assessed with respect to its film condition after 14 days.
• the silicone coating showed a grip-resistant and dry condition. Liquid silicone was no longer discernible.
• Example 2 In an analogous manner to Example 1, a coating experiment was carried out using a silicone oil emulsion.
• the silicone oil emulsion from the prior art contains 35% of a dimethylpolysiloxane of viscosity 350 cP and 5% of a non-ionic emulsifier.
• the profiles coated in an analogous manner had to be blown off with compressed air after coating in order to guarantee a uniform distribution.
• the coated EPDM strip was then rolled onto a spool and packed in a plastic film and heat-sealed in the same manner. On inserting this strip into window and door frames a very greasy silicone film present in liquid form was discernible, which showed a good lubricant action and made possible insertion into the window frames.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Wood Science & Technology (AREA)
• Organic Chemistry (AREA)
• Paints Or Removers (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Sealing Material Composition (AREA)

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Citations (11)

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• 2002
  • 2002-04-17 ES ES02008603T patent/ES2206431T3/es not_active Expired - Lifetime
  • 2002-04-17 DE DE50200054T patent/DE50200054D1/de not_active Expired - Lifetime
  • 2002-04-17 AT AT02008603T patent/ATE250647T1/de not_active IP Right Cessation
  • 2002-04-17 EP EP02008603A patent/EP1336643B1/de not_active Expired - Lifetime
• 2003
  • 2003-04-15 US US10/413,882 patent/US20030199398A1/en not_active Abandoned

Patent Citations (14)

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