EP1723209A1 - Perhydropolysilazane enthaltende beschichtungen für metall- und polymeroberflächen - Google Patents

Perhydropolysilazane enthaltende beschichtungen für metall- und polymeroberflächen

Info

Publication number
EP1723209A1
EP1723209A1 EP05707567A EP05707567A EP1723209A1 EP 1723209 A1 EP1723209 A1 EP 1723209A1 EP 05707567 A EP05707567 A EP 05707567A EP 05707567 A EP05707567 A EP 05707567A EP 1723209 A1 EP1723209 A1 EP 1723209A1
Authority
EP
European Patent Office
Prior art keywords
coating
perhydropolysilazane
rims
coating according
metal
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Withdrawn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
EP05707567A
Other languages
German (de)
English (en)
French (fr)
Inventor
Stefan Brand
Andreas Dierdorf
Hubert Liebe
Andreas Wacker
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.)
Clariant Finance BVI Ltd
Original Assignee
Clariant International Ltd
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 Clariant International Ltd filed Critical Clariant International Ltd
Publication of EP1723209A1 publication Critical patent/EP1723209A1/de
Withdrawn legal-status Critical Current

Links

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
    • 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
    • C09D183/16—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 in which all the silicon atoms are connected by linkages other than oxygen atoms
    • 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
    • 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
    • C09D183/02—Polysilicates
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31652—Of asbestos
    • Y10T428/31663—As siloxane, silicone or silane

Definitions

  • the present invention relates to the coating based on perhydropolysilazane for producing an easy-to-clean protective coating for metal or plastic surfaces.
  • the coating shows particularly good properties as a protective coating for rims, in particular aluminum rims.
  • a disadvantage of aluminum rims is their susceptibility to corrosion and their tendency to become dirty. In addition, scratches are much more noticeable on the shiny surface of an aluminum rim than on a steel rim.
  • Aluminum rims are therefore provided with a coating at the end of the manufacturing process, which usually consists of a pretreatment of the aluminum (chromate or chromate-free), a primer, a pigmented base coat and finally a clear coat. This complex coating is necessary in order to achieve an adequate
  • WO 02 / 088269A1 describes the use of a perhydropolysilazane solution for the production of hydrophilic, dirt-repellent surfaces.
  • the use in the automotive sector (on the body and the rims) is also described there, with perhydropolysilazane solutions with a weight fraction of 0.3 to 2% being recommended.
  • perhydropolysilazane solutions with a weight fraction of 0.3 to 2% being recommended.
  • a highly diluted solution with a weight fraction of only 0.5% perhydropolysilazane is used, with which a very thin coating of approximately 0.2 microns layer thickness on steel is obtained.
  • Such a thin coating is, on the one hand, unsuitable for preventing the scratching of the paint surface and, moreover, is not able to guarantee adequate corrosion protection and to prevent brake dust from being eaten.
  • the thin layer is not sufficient to level the relatively inhomogeneous clear lacquer layer and to obtain a really smooth, glass-like surface that is easy to clean.
  • the present invention had for its object to develop a coating with which it is possible to have rims with a hard, scratch-resistant
  • a perhydropolysilazane solution can be used to produce sufficiently thick protective layers which protect the rim from corrosion, scratching and corrosion of the brake dust and also make the rim easier to clean.
  • the invention therefore relates to a coating for surfaces, in particular for metal and polymer surfaces, containing at least perhydropolysilazane of the formula 1
  • n is an integer and n is such that the polysilazane has a number average molecular weight of 150 to 150,000 g / mol, as well as a solvent and a catalyst and optionally one or more co-binders.
  • the coating according to the invention is particularly suitable for producing an easy-to-clean protective coating on rims, in particular aluminum rims.
  • Another object of the invention is the use of the above-mentioned coating containing at least one perhydropolysilazane of the formula 1 in one.
  • a formulation contains a co-binder as an additional component, which further increases the flexibility of the perhydropolysilazane without losing properties such as the high scratch resistance, anti-corrosion effect and the scratch-resistant surface Production of an easy-to-clean protective coating on rims, especially aluminum rims.
  • the hardened coating preferably has a thickness of at least 1 micrometer, preferably 2 to 20 micrometers, particularly preferably 3 to 10 micrometers, and ensures adequate protection against corrosion, scratching and the ingestion of brake dust on the rim and thereby also makes the rims even lighter are clean.
  • the co-binder can either be an organopolysilazane of the formula 2,
  • R ', R ", R'” can be the same or different and are either hydrogen or organic radicals, with the proviso that R ', R “and R'” must not be hydrogen at the same time and in which n is so dimensioned is that the organopolysilazane has a number average molecular weight of 150 to 150,000 g / mol
  • lacquers such as cellulose derivatives, e.g. Cellulose acetobutyrate, polyester or modified polyester, phenolic or melamine resins, acrylates, epoxies or polyisocyanates.
  • Particularly suitable solvents for the perhydropolysilazane formulation are organic solvents which contain no water and no reactive groups (such as hydroxyl or amine groups). These are, for example, aliphatic or aromatic hydrocarbons, halogenated hydrocarbons, esters such as ethyl acetate or butyl acetate, ketones such as acetone or methyl ethyl ketone, ethers such as tetrahydrofuran or dibutyl ether, and also mono- and _.polyalkylene glycol dialyl ethers (GIymes) _or mixtures of these solvents.
  • a further component of the perhydropolysilazane formulation can be additives, e.g. Viscosity of the formulation, substrate wetting, film formation or that
  • Influence ventilation behavior or be organic and inorganic UV absorbers.
  • the coating according to the invention contains 1 to 40% by weight of at least one perhydropolysilazane of the formula (I), in particular 5 to 30% by weight, preferably 10 to 20% by weight, and 0.001 to 5% by weight, preferably 0, 01 to 2 wt .-% of a catalyst.
  • Suitable catalysts are N-heterocyclic compounds, such as 1-methylpiperazine, 1-methylpiperidine, 4,4'-trimethylene dipiperidine, 4,4'-trimethylene (1-methylpiperidine), diazobicyclo- (2,2,2) octane, cis- 2,6-dimethylpiperazine.
  • Suitable catalysts are mono-, di- and trialkylamines such as methylamine, dimethylamine, trimethylamine, phenylamine, diphenylamine and triphenylamine, DBU (1,8-diazabicyclo (5,4,0) -7-undecene), DBN (1,5- Diazabicyclo (4,5,0) -5-nonen), 1, 5,9-triazazyclododecane and 1, 4,7-triazazyclononane.
  • DBU 1,8-diazabicyclo (5,4,0) -7-undecene
  • DBN 1,5- Diazabicyclo (4,5,0) -5-nonen
  • 1, 5,9-triazazyclododecane 1, 4,7-triazazyclononane.
  • Suitable catalysts are organic and inorganic acids such as acetic acid, propionic acid, butyric acid, valeric acid, maleic acid, stearic acid, hydrochloric acid, nitric acid, sulfuric acid, phosphoric acid, chloric acid and hypochlorous acid.
  • Suitable catalysts are metal carboxylates of the general formula (RCOO) nM of saturated and unsaturated, aliphatic or alicyclic -CC 22 carboxylic acids and metal ions such as Ni, Ti, Pt, Rh, Co, Fe, Ru, Os, Pd, Ir, and Al ; n is the charge of the metal ion.
  • Suitable catalysts are acetylacetonate complexes of metal ions such as Ni, Pt, -Pd, Al and Rh - .._ _ .. _ - ... , ,
  • Suitable catalysts are metal powders such as Au, Ag, Pd or Ni with a particle size of 20 to 500 nm.
  • Suitable catalysts are peroxides such as hydrogen peroxide, metal chlorides and organometallic compounds such as ferrocene and zirconocene.
  • the coating with the polysilazane formulation can be carried out by methods which are usually used in painting. This can be spraying, dipping or flooding, for example. A thermal aftertreatment can then be carried out in order to accelerate the curing of the coating. Depending on the perhydropolysilazane formulation and catalyst used, curing takes place at room temperature, but can be accelerated by heating. Before the coating is applied, a primary layer can first be applied, for example to improve the adhesion.
  • the invention therefore furthermore relates to a process for producing a protective layer on a rim, the polysilazane solution which may contain co-binders being applied to the rim by suitable processes such as spraying or dipping and then hardened.
  • the hardened coating has a thickness of at least 1 micrometer, preferably 2 to 20 micrometers, particularly preferably 3 to 10 micrometers, and ensures excellent protection of the surfaces against corrosion and scratching. With rims coated in this way, brake dust is prevented from seizing in and cleaning is made considerably easier.
  • the coating according to the invention can also be applied to surfaces that have already been painted, e.g. on rims on which clear varnish has already been applied to additionally protect the rim from scratching, corrosion or the ingestion of brake dust.
  • Perhydropolysilazane solution can also be used as the only protective layer that replaces the commonly used clear lacquer.
  • the coating cures at room temperature and below, but can can be accelerated by increasing the temperature.
  • the coating is preferably cured at a temperature in the range from 10 to 200 ° C., in particular 25 to 160 ° C., preferably 80 to 150 ° C.
  • the maximum possible temperature for curing essentially depends on the substrate to which the coating is applied. In the case of metals such as aluminum, these can be higher temperatures, from 180 to 200 ° C or higher.
  • the coating is applied to an already existing lacquer layer (either basecoat or clear lacquer), it is advisable to work at a lower temperature so that the lower lacquer layer does not soften, preferably at 25 to 160 ° C, particularly preferably at 80 to 150 ° C.
  • the air humidity also has an influence on the curing of the coating.
  • faster curing takes place, which can be an advantage, conversely curing in an atmosphere with little humidity, for example in a drying cabinet, results in a slow and even curing process. Therefore, the coating according to the invention can be cured at a relative atmospheric humidity of 0 to 100%.
  • Coating with the perhydropolysilazane formulation can be followed by a further aftertreatment with which the surface energy of the coating is adjusted. In this way, either hydrophilic or hydrophobic surfaces can be created that influence the tendency to soiling.
  • the perhydropolysilazanes used are products from
  • the average molar mass of the perhydropolysilazane is approximately 2000 g / mol.
  • NP110-20 is a 20%
  • NL120A-20 is a 20%
  • NP 140-005 is a 0.5% perhydropolysilazane solution in xylene and Pegasol AN 45, the 4,4'-trimethylene-bis-
  • the aluminum rims are commercially available aluminum rims, as can be obtained from the car accessories trade, parts of these rims that were obtained by sawing entire rims or test sheets made of a suitable material. The coating was either sprayed with a commercially available
  • Spray gun or carried out by diving in a commercially available diving apparatus Spray gun or carried out by diving in a commercially available diving apparatus.
  • a non-pretreated aluminum sheet of the alloy AlMgSi 0.5 is coated with a 0.5% perhydropolysilazane solution NP 140-005 (Clariant Japan) by spraying. To cure the coating, leave it at room temperature and normal humidity for 5 days before testing. The result is a coating with a layer thickness of 0.2 ⁇ m.
  • Example 1 coating of an aluminum rim by spraying
  • a commercially available aluminum rim is 20% with a solution consisting of 97 parts Perhydropolysilazane solution NP110-20 (Clariant Japan), 2.4 parts Tego Protect 5001 (Tego Chemie), 0.5 part Byk 411 and 0.1 part Byk 333 (Byk-Chemie) coated by spraying.
  • the mixture is then vented in air for about 10 minutes and then dried at 80 ° C. for 60 minutes.
  • the result is a clear, transparent and crack-free coating on the surface.
  • the gloss level of the coated rim has increased by 5 gloss units compared to the uncoated rim.
  • Example 2 coating a coated sheet with basecoat and clearcoat by dipping
  • a painted aluminum sheet which is provided with a commercially available pigmented basecoat and a clearcoat, is placed in an immersion apparatus which contains a solution consisting of 97 parts of 20% perhydropolysilazane solution NP110-20 (Clariant Japan), 2.4 parts of Tego Protect 5001 (Tego Chemistry),
  • Example 3 coating of a polished aluminum sheet by spraying
  • a polished aluminum sheet is coated with a 20% perhydropolysilazane solution NL110A-20 (Clariant Japan) by spraying.
  • the mixture is then vented in air for about 10 minutes and then dried at 130 ° C. for 60 minutes.
  • the result is a clear, transparent, crack-free coating.
  • Example 4 coating of a polished aluminum sheet by dipping
  • a polished aluminum sheet is immersed in a diving apparatus filled with a 20% perhydropolysilazane solution NL110A-20 (Clariant Japan) and pulled out at a speed of 120 cm / min. The mixture is then vented in air for about 10 minutes and in a drying cabinet for 60 minutes at 180 ° C dried. The result is a clear, transparent and crack-free coating.
  • Example 5 coating of a polished aluminum sheet by spraying
  • a polished aluminum sheet is coated with a solution consisting of 100 parts of 20% perhydropolysilazane solution NL110A-20 (Clariant Japan) and 3.5 parts of polymethylpolysilazane by spraying. The mixture is then vented in air for about 10 minutes and then dried at 130 ° C. for 60 minutes. The result is a clear, transparent, crack-free coating.
  • a non-pretreated aluminum sheet of the alloy AlMgSi 0.5 is coated with a 20% perhydropolysilazane solution NP110-20 (Clariant Japan) by spraying. The mixture is then vented in air for about 10 minutes and dried at 130 ° C. for 60 minutes. The result is a clear, transparent, crack-free coating with a layer thickness of 2.6 ⁇ m.
  • Several sheets obtained in this way are subjected to a salt spray test according to ISO 7253 and a condensate test according to ISO 6270. After 1000 h, there are no traces of corrosion either in the salt spray test or in the condensed water test, while an uncoated comparative sheet is badly corroded.
  • the coated sheet from Comparative Example 1 shows clear signs of corrosion.
  • a coated aluminum rim from Example 1 is mounted on the front axle of a commercially available car. On the other side there is a rim of the same type which is not provided with the additional coating according to the invention. The car is then driven several thousand kilometers under everyday conditions. During this time the
  • the coated rim can Dirt can be easily removed with a paper towel or with a water jet, while this is not possible on the uncoated rim. Eating of brake dust is not observed on the coated rim, while over time black spots are observed on the uncoated rim, which can only be removed with difficulty or not at all by cleaning.
  • the scratch resistance is determined by repeated loading (five double strokes) with a steel wool of type 00 and a force of 3 N. The scratch is assessed visually according to the following scale: very good (no scratches), good (few scratches), satisfactory (significant scratches), sufficient (badly scratched) and poor (very badly scratched).

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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)
  • Application Of Or Painting With Fluid Materials (AREA)
EP05707567A 2004-03-04 2005-02-22 Perhydropolysilazane enthaltende beschichtungen für metall- und polymeroberflächen Withdrawn EP1723209A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410011212 DE102004011212A1 (de) 2004-03-04 2004-03-04 Perhydropolysilazane enthaltende Beschichtungen für Metall- und Polymeroberflächen
PCT/EP2005/001827 WO2005085374A1 (de) 2004-03-04 2005-02-22 Perhydropolysilazane enthaltende beschichtungen für metall- und polymeroberflächen

Publications (1)

Publication Number Publication Date
EP1723209A1 true EP1723209A1 (de) 2006-11-22

Family

ID=34895030

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05707567A Withdrawn EP1723209A1 (de) 2004-03-04 2005-02-22 Perhydropolysilazane enthaltende beschichtungen für metall- und polymeroberflächen

Country Status (15)

Country Link
US (1) US20070196672A1 (ru)
EP (1) EP1723209A1 (ru)
JP (1) JP2007526377A (ru)
KR (1) KR20060134098A (ru)
AR (1) AR047919A1 (ru)
AU (1) AU2005219519A1 (ru)
BR (1) BRPI0508437A (ru)
CA (1) CA2558512A1 (ru)
DE (1) DE102004011212A1 (ru)
IL (1) IL177866A0 (ru)
PL (1) PL380573A1 (ru)
RU (1) RU2374284C2 (ru)
TW (1) TW200533721A (ru)
WO (1) WO2005085374A1 (ru)
ZA (1) ZA200605342B (ru)

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AU2005219519A1 (en) 2005-09-15
TW200533721A (en) 2005-10-16
AR047919A1 (es) 2006-03-01
WO2005085374A1 (de) 2005-09-15
PL380573A1 (pl) 2007-02-19
JP2007526377A (ja) 2007-09-13
BRPI0508437A (pt) 2007-07-24
DE102004011212A1 (de) 2005-09-29
IL177866A0 (en) 2006-12-31
RU2006134985A (ru) 2008-04-10
KR20060134098A (ko) 2006-12-27
ZA200605342B (en) 2007-12-27
CA2558512A1 (en) 2005-09-15
RU2374284C2 (ru) 2009-11-27
US20070196672A1 (en) 2007-08-23

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