DE102012004278A1 - Coating composition, useful e.g. for wear resistant and antiadhesive surface coatings, comprises e.g. metal or semimetal oxide compounds, organosilane compounds, fluorinated polyether, and organosilanes with fluorine-containing side chains - Google Patents

Abstract

Coating composition comprises: (a) 0-90 mol-% of metal- or semimetal oxide compounds (I), and their hydrolysis and condensation products; (b) 10-99 mol-% of organosilane compounds (II) and their condensation products or mixed condensation products of the component (a), and mixtures of condensation products of various such organosilanes; (c) 0.05-10 wt.% of fluorinated polyether; (d) 0-3% of one or more organosilanes with fluorine-containing side chains, and their hydrolysis and condensation products; and (e) 0.05-20 wt.% of cyanamide or 0.05-10 wt.% of dicyandiamide. Coating composition, useful for wear-resistant and anti-adhesive surface coatings, comprises: (a) 0-90 mol-% of one or a mixture of several metal- or semimetal oxide compounds of formula (M(OR1) n) (I), and their hydrolysis and condensation products; (b) 10-99 mol-% of one or a mixture of several organosilane compounds of formula (R2 aSi(R3) 4 - a) (II) and their condensation products or mixed condensation products of the component (a), and mixtures of condensation products of various such organosilanes, whose organic radicals can react with each other; (c) 0.05-10 wt.% of one or more fluorinated polyether whose polymer chain is composed of tetrafluoroethylene and hexafluoropropylene oxide chains and has at least one hydrolyzable silyl radical connected via a pure carbon chain and their hydrolysis and condensation products or mixed condensation products with the components (a) and (b); (d) 0-3% of one or more organosilanes with fluorine-containing side chains, and their hydrolysis and condensation products or mixed condensation products with the components (a)-(c); and (e) 0.05-20 wt.% of cyanamide or 0.05-10 wt.% of dicyandiamide. M : B, Al, Si, Ti or Zr; R1 : 1-10C-alkyl, aryl, acyl or alkoxyalkyl; n : 2-4 R2 : 1-20C-alkyl, 1-20C-alkenyl or aryl (all optionally substituted with epoxy-, amino-, aminoalkylamino-, methacryl-, acryl-, isocyanato-, alkylcarbamato-, cyanato-, carboxylato- or chloro-groups); R3 : 1-10C-alkoxy, aryloxy, alkoxyalkoxy or Cl; and a : 1-3. An independent claim is included for a printing substrate contacting surface, comprising a substrate with structural inquiries, where the substrate is at least locally coated with a single component coating comprising the composition.

Description

The invention relates to a coating composition for abrasion-resistant and anti-adhesive surface coatings according to the preamble of claim 1 and its application, in particular in the printing industry.

Surfaces in which the adhesion of media to which the surface is regularly exposed are suppressed or at least hindered in many areas of the industry. Examples of these are machine parts which are easy to clean and reactors and lines coated against the adhesion of chemicals.

An example to be highlighted are printing substrate contacting surfaces. In printing machines and especially in perfecting rotary printing machines such transport or guide surfaces come with the often dust-bearing substrate, eg. As paper, cardboard or foil, or even with previously printed ink or paint in contact. If such surfaces were not provided with an anti-adhesive and, in particular, ink-repellent coating, then the so-called color build-up on the transport or guide surfaces and as a result of the impairment of subsequent printed images would occur. Substrate-contacting surfaces are often designed as exchangeable cylinder lift (so-called "jackets") for sheet-transporting cylinders. In addition, such surfaces were harder to clean.

In addition, printing substrate-contacting surfaces are often provided with a structuring, i. H. they comprise a substrate, e.g. As a sheet, with structure surveys in the micrometer range. The structure surveys can z. B. be galvanically generated or thermally sprayed. Their purpose is to guide the substrate by preventing a relative movement between substrate and guide surface due to the roughness of the surface produced by them and thus a deterioration of the printed image by shearing or smearing. The described use of anti-adhesive and especially ink-repellent so-called functional coatings in the printing industry poses at least two demands on the coating systems: on the one hand, they must be able to be applied to microstructured surfaces and adhere there permanently, and, on the other hand, they must be extremely resistant to abrasion, so that they are durable Resistant to stress through the substrate transport or contact without damage. To illustrate, industrial presses such as the Speedmaster SM 102 from Heidelberger Druckmaschinen AG print up to 18,000 sheets of paper per hour. This corresponds to a contact frequency (guide surface with successive arc) of 5 Hz.

In addition to the mentioned transport or guide surfaces come in printing machines and other components / components with printing inks or paints in contact, such. B. paint / lacquer trays, doctor blades, squeegee trays or grippers. Again, functional coatings can prevent fouling or facilitate cleaning.

A tensioning mechanism for jackets is out of the US Pat. No. 7,641,194 B2 and an automatic switching mechanism is out of the US 7,287,750 B2 known.

The two materials that have been used most frequently in the production of such anti-adhesive coatings in industrial applications are on the one hand silicone [poly (diorganylsiloxane), usually polydimethylsiloxane], and on the other hand perfluorinated polyolefins, usually polytetrafluoroethene. The latter has been widely used under the trade name TEFLON ™, among others in the coating of equipment in the chemical industry. Numerous patents and publications describe the application of silicones (eg NL 6610980 . US 5716444 A . US Pat. No. 5,736,249 ) and perfluorinated polymers (eg. AE Feiring, JF Imbalzano, DL Kerbow, Adv. Fluoroplast., Plast. Closely. 1994, 27. ), as well as mixtures of both (eg US 3592790 A . JP 62260787 A2 . JP 01167393 A2 . JP 02182767 A2 . EP 681013 A3 . US 5631042 A ).

Common to both materials is a low surface energy of about 20 mN / m, a temperature stability of over 200 ° C. and a low mechanical hardness. A disadvantage of both systems is the poor solubility in other media, so that the application of the coating mostly from emulsion, from the vapor phase or (in the case of fluoropolymers) from very expensive perfluorinated solvents.

Both polymer families have also been used to modify organic polymer coatings (e.g. JP 11124497 A2 ).

Coatings with higher mechanical hardness can be prepared in conventional organic solvents by joint hydrolysis and condensation of various organyl-substituted silanes ("sol-gel process") (eg. DE 44 44 780 A1 . US 4684577 A ). Another advantage of this method is the stable covalent attachment of the polysiloxane formed on polar substrates. Extremely low surface energies - and thus extremely anti-adhesive effect - are not achieved with such systems.

The use of silanes with perfluorinated organic residue allows the covalent attachment of perfluoroalkyl groups on various polar material surfaces such as glass, ceramics, metals and metal oxides. With such compounds coatings with very low surface energies (below 20 mN / m) can be produced, which can also be thermally charged to 300 ° C or even higher. Some patents describe the application of such compounds by vapor deposition (eg. US 5166000 A1 . EP 571896 ) or from solution (eg JP 09087402 A2 ), resulting in very thin (in extreme cases monomolecular) layers. Coatings which are composed exclusively of fluoroalkylsilanes have the disadvantage that the abrasion resistance of the thin layers is generally insufficient to maintain the antiadhesive effect under mechanical stress for a prolonged period of time.

In DE 195 44 763 A1 and WO 97/02005 A1 describes coatings of organyl-substituted and perfluorinated silanes, which are to be prepared by sol-gel method. There are described fluorine compounds having fluorine atoms bonded to aliphatic carbon atoms, with chains of 8 to 18 carbon atoms being particularly preferred. However, co-hydrolysis and condensation of long-chain perfluoroalkylsilanes with other functionalized silanes (cocondensation) is not possible in conventional solvents since the former are insoluble in conventional solvents and therefore lead to phase separation. From an ecological point of view, the use of long-chain perfluorinated hydrocarbons has been critical for several years, as it has been found worldwide in nature, especially in plants and animals enrichments. These chemical compounds, especially perfluorooctanoic acid are not degradable in the environment.

• A) 0–90 Mol-% eines oder einer Mischung mehrerer Metall- oder Halbmetallalkoxide der allgemeinen Formel M(OR<1>)n, worin M B, Al, Si, Ti oder Zr, R<1>C1-C10-Alkyl, Aryl, Acyl oder Alkoxyalkyl und n eine Zahl von 2 bis 4 bedeuten, sowie Hydrolyse- und Kondensationsprodukte davon,
• B) 10–99 Mol-% eines oder einer Mischung mehrerer Organosilane der allgemeinen Formel R<2>aSi(R<3>)4-a, worin R<2>C1-C20-Alkyl-, C1-C20-Alkenyl- oder Arylgruppen, die jeweils voneinander unabhängig mit Epoxy-, Amino-, Aminoalkylamino-Methacryl-, Acryl-, Isocyanato-, Alkylcarbamato-, Cyanato-, Carboxylato- und Chlorogruppen substituiert sein können, bedeutet, R<3>C1-C10-Alkoxy, Aryloxy, Alkoxyalkoxy oder Cl bedeutet und a eine Zahl im Bereich von 1 bis 3 darstellt, sowie Hydrolyse- und Kondensationsprodukten davon oder gemischte Kondensationsprodukte mit den unter A) beschriebenen Verbindungen, sowie Mischungen von Kondensationsprodukten verschiedener solcher Organosilane, deren organische Reste miteinander reagieren können, und
• C) 0,05–10% eines oder mehrerer fluorierter Polyether, dessen Polymerkette aus Tetrafluorethylenoxid- oder Hexafluorpropylenoxid-Ketten aufgebaut ist und der über mindestens einen über eine reine Kohlenstoffkette angebundenen hydrolysierbaren Silyl-Rest verfügt, sowie von Hydrolyse- und Kondensationsprodukten davon oder gemischte Kondensationsprodukte mit den unter A) und B) genannten Verbindungen,
• D) 0–3% eines oder mehrerer Organosilane mit fluorhaltiger Seitenkette, sowie von Hydrolyse- und Kondensationsprodukten davon oder gemischten Kondensationsprodukten mit den unter A) bis C) genannten Verbindungen.

The DE 100 04 132 A1 already describes a coating composition for transparent, abrasion resistant and antiadhesive surface coatings, with the ingredients

• A) 0-90 mol% of one or a mixture of a plurality of metal or semimetal alkoxides of the general formula M (OR <1>) n, in which MB, Al, Si, Ti or Zr, R <C1> C1-C10-alkyl, Aryl, acyl or alkoxyalkyl and n is a number from 2 to 4, and hydrolysis and condensation products thereof,
• B) 10-99 mol% of one or a mixture of several organosilanes of the general formula R 2 aSi (R 3) 4-a, in which R 2 is C 1 -C 20 -alkyl-, C 1 -C 20 -alkenyl- or aryl groups which may each be independently substituted with epoxy, amino, aminoalkylamino-methacrylic, acrylic, isocyanato, alkylcarbamato, cyanato, carboxylato and chloro groups, R <C> C1-C10-alkoxy , Aryloxy, alkoxyalkoxy or Cl and a represents a number in the range of 1 to 3, and hydrolysis and condensation products thereof or mixed condensation products with the compounds described under A), as well as mixtures of condensation products of various such organosilanes whose organic groups can react with each other , and
• C) 0.05-10% of one or more fluorinated polyethers, the polymer chain of which is composed of tetrafluoroethylene oxide or hexafluoropropylene oxide chains and which has at least one hydrolyzable silyl radical attached via a pure carbon chain, as well as hydrolysis and condensation products thereof or mixed ones Condensation products with the compounds mentioned under A) and B),
• D) 0-3% of one or more organosilanes with fluorine-containing side chain, and of hydrolysis and condensation products thereof or mixed condensation products with the compounds mentioned under A) to C).

The wear resistance of non-reinforced, functional coatings based on such a coating composition can be used for demanding applications, such. As the production of anti-adhesive coatings on substrate contacting surfaces are insufficient.

One possible solution has been the addition of solid microparticles or nanoparticles to the coating composition which provide the necessary abrasion resistance in the formed coating. Such nanoparticles, z. As PTFE, ceramic, metal or glass particles can be expensive and thereby burden the cost of the coating. Examples can be found in the disclosures JP 11-165399 . JP 2001-260561 . DE 10 2005 037 338 or DE 10 2006 023 375 ,

The use of the substances cyanamide and dicyandiamide for the crosslinking of epoxy systems is known. The use of the substances cyanamide and dicyandiamide to improve the wear resistance of coatings prepared by the sol-gel process, however, is not yet known.

The object of the invention is an opposite to that from the DE 100 04 132 A1 known composition with respect to their wear resistance improved composition for a mechanically strong, abrasion-resistant coating with strong anti-adhesive action against polar and non-polar media provide. Another object of the invention is to be compared to that of the DE 100 04 132 A1 known composition to provide improved composition in terms of their hardness and modulus of elasticity. Another object of the invention is to be compared to that of the DE 100 04 132 A1 known composition in terms of their wear resistance, hardness and / or their modulus of elasticity to provide improved composition that meets the high demands, especially on the wear resistance, for use in the printing industry and there above all for use as a coating of substrate contacting surfaces.

To solve these tasks, the applicants carried out joint extensive examinations and complex practical tests.

• A) 0–90 Mol-% eines oder einer Mischung mehrerer Metall- oder Halbmetallalkoxide der allgemeinen Formel M(OR<1>)n, worin M B, Al, Si, Ti oder Zr, R<1>C1-C10-Alkyl, Aryl, Acyl oder Alkoxyalkyl und n eine Zahl von 2 bis 4 bedeuten, sowie Hydrolyse- und Kondensationsprodukte davon,
• B) 10–99 Mol-% eines oder einer Mischung mehrerer Organosilane der allgemeinen Formel R<2>aSi(R<3>)4-a, worin R<2>C1-C20-Alkyl-, C1-C20-Alkenyl- oder Arylgruppen, die jeweils voneinander unabhängig mit Epoxy-, Amino-, Aminoalkylamino-, Methacryl-, Acryl-, Isocyanato-, Alkylcarbamato-, Cyanato-, Carboxylato- und Chlorogruppen substituiert sein können, bedeutet, R<3>C1-C10-Alkoxy, Aryloxy, Alkoxyalkoxy oder Cl bedeutet und a eine Zahl im Bereich von 1 bis 3 darstellt, sowie Hydrolyse- und Kondensationsprodukten davon oder gemischte Kondensationsprodukte mit den unter A) beschriebenen Verbindungen, sowie Mischungen von Kondensationsprodukten verschiedener solcher Organosilane, deren organische Reste miteinander reagieren können,
• C) 0,05–10% eines oder mehrerer fluorierter Polyether, dessen Polymerkette aus Tetrafluorethylenoxid- oder Hexafluorpropylenoxid-Ketten aufgebaut ist und der über mindestens einen über eine reine Kohlenstoffkette angebundenen hydrolysierbaren Silyl-Rest verfügt, sowie von Hydrolyse- und Kondensationsprodukten davon oder gemischte Kondensationsprodukte mit den unter A) und B) genannten Verbindungen,
• D) 0–3% eines oder mehrerer Organosilane mit fluorhaltiger Seitenkette, sowie von Hydrolyse- und Kondensationsprodukten davon oder gemischten Kondensationsprodukten mit den unter A) bis C) genannten Verbindungen, und sich auszeichnet durch den Bestandteil
• E) 0,05–20 Gew% Cyanamid oder 0,05–10 Gew% Dicyandiamid.

According to the invention, this object is achieved by a coating solution which contains the following constituents:

• A) 0-90 mol% of one or a mixture of a plurality of metal or semimetal alkoxides of the general formula M (OR <1>) n, in which MB, Al, Si, Ti or Zr, R <C1> C1-C10-alkyl, Aryl, acyl or alkoxyalkyl and n is a number from 2 to 4, and hydrolysis and condensation products thereof,
• B) 10-99 mol% of one or a mixture of several organosilanes of the general formula R 2 aSi (R 3) 4-a, in which R 2 is C 1 -C 20 -alkyl-, C 1 -C 20 -alkenyl- or aryl groups which may each be substituted independently of one another with epoxy, amino, aminoalkylamino, methacrylic, acrylic, isocyanato, alkylcarbamato, cyanato, carboxylato and chloro groups, R <3> denotes C1-C10- Alkoxy, aryloxy, alkoxyalkoxy or Cl and a is a number in the range of 1 to 3, and hydrolysis and condensation products thereof or mixed condensation products with the compounds described under A), and mixtures of condensation products of various such organosilanes, the organic radicals react with each other can,
• C) 0.05-10% of one or more fluorinated polyethers, the polymer chain of which is composed of tetrafluoroethylene oxide or hexafluoropropylene oxide chains and which has at least one hydrolyzable silyl radical attached via a pure carbon chain, as well as hydrolysis and condensation products thereof or mixed ones Condensation products with the compounds mentioned under A) and B),
• D) 0-3% of one or more organosilanes with fluorine-containing side chain, and of hydrolysis and condensation products thereof or mixed condensation products with the compounds mentioned under A) to C), and is characterized by the constituent
• E) 0.05-20% by weight of cyanamide or 0.05-10% by weight of dicyandiamide.

Preferred embodiments of the coating solution according to the invention are defined in the subclaims.

The addition according to the invention of cyanamide or dicyandiamide and their direct chemical action in the sol / gel system to be crosslinked with free silanol groups or other reactive groups leads to an advantageous increase in the degree of crosslinking and, as a result, to an increase in wear resistance and hardness of the the coating solution producible functional coating, the other surface properties are substantially retained. Further advantages of the invention will become apparent from the use of commercially available and reproducible in their quality substances cyanamide or dicyandiamide and thereby easy preparation of the coating solution without additional intermediate steps. In addition, no residues or precipitates occur advantageously in the preparation according to the invention in an advantageous manner. Finally, the desired degree of crosslinking can be controlled via the added amount (within the percentage ranges specified in process step E) of cyanamide or dicyandiamide, and thereby z. B. the ratio of hardness to flexibility of the producible functional coating can be adjusted in an advantageous manner.

As a preferred coating composition for the purposes mentioned, in particular for use as a coating of printing material surfaces, a coating composition having 6-8% by weight of cyanamide or 2-3% by weight of dicyandiamide could be determined in the extensive investigations and complex practical tests.

The addition or addition of cyanamide or dicyandiamide is preferably carried out during the hydrolysis of the silanes used or preferably after the condensation step.

Coatings based on the described composition can be applied to a variety of substrates such as glass, stone, ceramics, polymers, metals, alloys, wood, etc. by means of common coating methods such as spraying, dipping, knife coating, flooding. The resulting antiadhesive layers can be used in countless areas of the industry.

The advantage of this invention is that perfluoropolyether doped, organically modified silica sols by addition of cyanamide / dicyandiamide coatings give higher hardness and significantly better wear behavior under demanding loads, without the others DE 100 04 132 A1 known Layer properties negatively influence. Furthermore, there is the advantage in the commercial, inexpensive access of these substances with reproducible qualities. Since the incorporation into the formulations without residues and without precipitation is possible and no coating quality deteriorating polysiloxane occur, can be produced by means of the invention in mass production coatings.

embodiments

example 1

At room temperature, 300 ml of sec-butanol, 300 ml of methoxy-propanol and 100 ml of n-pentanol are introduced into the mixture. This is followed by stirring in the following order the addition of 100 ml of tetraethoxy silane, 50 ml of methyltriethoxysilane and 25 ml Glycidoxypropylsilan and 100 ml of a solution of 1.0% by volume of perfluoropolyether silane "Fluorolink S10" on. The final part is 100 ml of a 0.1% trifluoroacetic acid solution. This mixture is stirred for a further three hours and stored for three days before use.

A coating of the solution on polyethylene terephthalate film by means of Filmzieh-Rakel (wet layer thickness: 25 microns). After venting the solvent, the system is thermally crosslinked over a period of t = 15 min at a temperature of T = 130 ° C. The result is a clear, colorless layer.

Results of the layer characterization:

• • Abrasion resistance: "Taber Abraser 5131" from TABER Industries (friction wheels CS-10, contact force 25 N) - gloss measurement / reflectometer "REFO 3-D" - initial gloss: 170 - Loss loss after 100 cycles Taber Abraser: 10% - Loss after 500 cycles Taber Abraser: 18%
• Anti-Adhesiveness: Contact Angle Measurement (KRÜSS Drop Shape Analysis System Data DAS 10 / Mk2) - Contact angle against water: 110 ° - Contact angle against n-hexadecane: 68 °

Example 2

250 ml of the sol / gel solution from Example 1 are introduced into a 1 liter glass vessel. With stirring, the addition of 0.5 g of the cyanamide powder "F 1000". After further stirring for a period of two hours, this coating system is ready for use.

The coating of this sol / gel solution on PET film by means of a doctor blade, comparable to Example 1.

In this case, a clear, colorless layer is obtained.

Results of the layer characterization:

• • abrasion resistance: - initial gloss: 170 - Loss loss after 100 cycles Taber Abraser: 6% - Loss after 500 cycles Taber Abraser: 12%
• • Anti-adhesiveness: - Contact angle against water: 111 ° - Contact angle against n-hexadecane: 67 °

Example 3

The procedure of Example 2 is maintained. In this case, instead of adding the cyanamide with continuous stirring, the addition of 0.5 g of the dicyandiamide "1-cyanoganidine". The resulting solution is stirred for a further two hours at room temperature and can then be used.

A knife coating on polyethylene terephthalate film and subsequent thermal crosslinking at T = 130 ° C results in a clear, colorless layer.

Results of the layer characterization:

• • abrasion resistance: - initial gloss: 172 - Loss loss after 100 cycles Taber Abraser: 4% - Loss loss after 500 cycles Taber Abraser: 9%
• • Anti-adhesiveness: - Contact angle against water: 112 ° - Contact angle against n-hexadecane: 68 °

Example 4

Coating of Q panels (aluminum test panels) with sol / gel solutions from Examples 1 to 3 and comparison of the abrasion resistance and the anti-adhesiveness.

Aluminum test panels "A-46" were coated by means of SATA minijet with the sol / gel solutions of Examples 1 to 3 and thermally crosslinked after solvent evaporation at T = 150 ° C.

Results of the layer characterization:

• • Liability: - Crosshatch: - Example 1: Gt = 0 - Example 2: Gt = 0 - Example 2: Gt = 0
• • abrasion resistance: - Loss loss after 100 cycles: - Example 1: 15% - Example 2: 7% - Example 3: 4% Mass loss after 100 cycles: - Example 1: 0.001 g - Ex. 2: 0,000 g - Ex. 3: 0.000 g
• • Anti-adhesiveness: - Contact angle against water: - Example 1: 1100 - Ex. 2: 111 ° - Example 3: 112 ° Contact angle against n-hexadecane: - Ex. 1: 67 ° - Ex. 2: 68 ° - Example 3: 68 °

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 7641194 B2 [0006]
• US 7287750 B2 [0006]
• NL 6610980 [0007]
• US 5716444 A [0007]
• US 5736249 A [0007]
• US 3592790 A [0007]
• JP 62260787 A2 [0007]
• JP 01167393 A2 [0007]
• JP 02182767 A2 [0007]
• EP 681013 A3 [0007]
• US 5631042 A [0007]
• JP 11124497 A2 [0009]
• DE 4444780 A1 [0010]
• US 4684577 A [0010]
• US 5166000 A1 [0011]
• EP 571896 [0011]
• JP 09087402 A2 [0011]
• DE 19544763 A1 [0012]
• WO 97/02005 Al [0012]
• DE 10004132 A1 [0013, 0017, 0017, 0017, 0025]
• JP 11-165399 [0015]
• JP 2001-260561 [0015]
• DE 102005037338 [0015]
• DE 102006023375 [0015]

Cited non-patent literature

• AE Feiring, JF Imbalzano, DL Kerbow, Adv. Fluoroplast., Plast. Closely. 1994, 27. [0007]

Claims (8)

Coating composition for abrasion resistant and antiadhesive surface coatings, with the components: A) 0-90 mol% of one or a mixture of a plurality of metal or semimetal alkoxides of the general formula M (OR <1>) n, in which MB, Al, Si, Ti or Zr, R <C1> C1-C10-alkyl, Aryl, acyl or alkoxyalkyl and n is a number from 2 to 4, and hydrolysis and condensation products thereof, B) 10-99 mol% of one or a mixture of several organosilanes of the general formula R 2 aSi (R 3) 4-a, in which R 2 is C 1 -C 20 -alkyl-, C 1 -C 20 -alkenyl- or aryl groups which may each be substituted independently of one another with epoxy, amino, aminoalkylamino, methacrylic, acrylic, isocyanato, alkylcarbamato, cyanato, carboxylato and chloro groups, R <3> denotes C1-C10- Alkoxy, aryloxy, alkoxyalkoxy or Cl and a is a number in the range of 1 to 3, and hydrolysis and condensation products thereof or mixed condensation products with the compounds described under A), and mixtures of condensation products of various such organosilanes, the organic radicals react with each other can, C) 0.05-10% of one or more fluorinated polyethers whose polymer chain is made up of tetrafluoroethylene oxide or hexafluoropropylene oxide chains and which has at least one hydrolyzable silyl radical attached via a pure carbon chain, as well as hydrolysis and condensation products thereof or mixed ones Condensation products with the compounds mentioned under A) and B), D) 0-3% of one or more organosilanes with fluorine-containing side chain, and of hydrolysis and condensation products thereof or mixed condensation products with the compounds mentioned under A) to C), marked through the component E) 0.05-20% by weight of cyanamide or 0.05-10% by weight of dicyandiamide. Coating composition according to claim 1, characterized by 6-8% by weight of cyanamide or 2-3% by weight of dicyandiamide. Coating composition according to claim 1, characterized in that the metal or semimetal oxides are tetraalkoxysilanes. Coating composition according to claim 2, characterized in that the tetraalkoxysilane is tetraethylorthosilicate. Use of the coating composition of claim 1 for the coating of substrates. Use according to claim 6, characterized in that as substrates ceramics, polymers, metals or alloys are coated. Substrate-contacting surface, comprising a substrate with structure elevations, characterized in that on the substrate at least locally a one-component coating with a coating composition according to one of claims 1 to 4. Substrate contacting surface according to claim 7, characterized in that it is designed as a removable cylinder lift for sheet transporting cylinders of a perfecting rotary printing press.