DE2544860C3 - - Google Patents

Description

It is often necessary to protect sensitive surfaces by coating them with a protective paint To protect against abrasion. In the field of anti-abrasion protective coatings there are numerous: publications known (see. US-PS 36 87 882, 36 37 416, 36 42 681, 37 08 225, 34 60 956, 37 62 981 and 27 68 909 as well as JA-PSr. 49-117529).

In FR-PS 14 73 183 is a method for coating voi: glass fibers with a solution or Dispersion, which is an olefinic or copolymer, an organotitanium compound, preferably an orthotitanate, in combination with a '.' !! saturated silane, contains an epoxysilane or an aminosilane and optionally a plasticizer.

From "Farbe und Lack", No. 61 (1955), pp. 60 to 66, is the use of monomeric and polymeric Butyl titanate known for painting purposes. The butyl titanate can here in substance or optionally can be used together with pigments and other common additives without a polymeric binder as a paint.

The invention is based on the object of a method for producing abrasion-resistant coatings on plastic or metal substrates that provide paints with good corrosion and solvent resistance that have a low surface energy so that foreign particles do not easily adhere. This object is achieved by the invention.

The invention thus relates to a method for the production of abrasion-resistant coatings on plastic or metal substrates, which is characterized in that, optionally with a Primer precoated substrate made of a coating composition from a mixture

a) a titanium, aluminum or zirconium ester with at least two ester groups of the formula —OR on the metal atom, where R is a hydrocarbon radical with 1 to 18 carbon atoms,

b) an epoxy and / or acrylic silane and optionally

c) customary additives and / or fillers

applies and cures by exposure to UV light and / or electron beams and / or heat.

In the metal esters used according to the invention all metal valences are preferably saturated by ester groups, but other groups can also be used be present as long as at least two ester groups are present. There can be compounds of the general formula

R _n ¹ M (OR) ,,, - ,,

ίο are used, in which R has the meaning given in the claim, M represents a titanium, aluminum or zirconium atom, m is equal to the valence of M, π has the value O, 1 or 2, (m - / ^ has at least the value 2 and R 'is an organic or inorganic group bonded to M or a Complexing agents for saturating the free valences of M are compounds of the general formula

M (OR) _n

are generally preferred for their ready availability and advantageous properties. R preferably denotes an alkyl or acyl radical with 1 to 8 carbon atoms.

It is critical that the metal ester not be fully hydrolyzed or hydrolyzed to the point that it is less are present as two ester groups per metal atom on the metal ester. If the metal ester

jo is so largely hydrolyzed, the ambifunk fall tional silane and the metal ester together in insoluble form because the reactive sites for the

There is no silane on the ester. Component (a) should preferably be the coating

The mass must not be hydrolyzed. Although partially hydrolyzed esters can be used, the proportion of Water should not be greater than 0.5 equivalent per equivalent of metal ester. For example, a larger one leads Water content in masses containing titanium esters to form titanium dioxide, which is easily extracted from the mixture The use of hydrolyzed components has the further disadvantage that an additional step is precipitated the production of the coating compound is necessary.

Furthermore, hydrolyzed components do not have the required shelf life.

The reactive silanes used according to the invention as component (b) have the general formula

in which R ^{1 is} an acryloxy group of the general formula

R ⁴ O

in which R ^{J is} an alkylene radical having ^{1 to 8 carbon atoms and R 4 is} a hydrogen atom or a hydrocarbon radical having 1 to 8 carbon atoms (preferably = an alkyl radical), or an epoxy group of the general formula

CH ₂ CH-R ^S _B -

means in which R ^{5 represents} a divalent aliphatic, aromatic or aliphatic-aromatic hydrocarbon radical with fewer than 20 carbon atoms or a divalent radical with fewer than 20 carbon atoms, which is composed of C-, H-, N-, S- and O- Atoms (these atoms are the only ones that can appear in the skeleton of the divalent radicals). The oxygen atoms are in the form of ether bridges. No two heteroatoms should be linked to one another within the skeleton of the divalent hydrocarbon radical, m has the value 1, 2 or 3 and η has the value 1 or 2. R ² is an oxyhydrocarbon radical, preferably an alkoxy, acyl or acetoxy radical with 1 to 8 carbon atoms or a radical of the general formula (CHaCH ₂ O) ItZ, in which Z denotes an aliphatic hydrocarbon radical with fewer than 10 carbon atoms or a hydrogen atom and j is an integer with a value of at least 1. The oxyhydrocarbon radical is a hydrocarbon radical which optionally contains one nitrogen, sulfur or oxygen atom in the skeleton chain for every 2 carbon atoms in the skeleton chain, in which a hydrogen atom bonded to a carbon atom has been replaced by a divalent oxygen atom, which therefore still has a free valence. For example, if you start from CHjCHiOCHi, the oxyhydrogen radical can have the formula

-0-CH ₂ CH ₃ OCHj

ί have.

Specific examples of the hydrocarbon groups are aromatic groups such as phenyl, naphthyl and Benzothienyl group, and aliphatic linear, branched or cyclic radicals, including the cyclohexyl,

κι tetrahydrofuryl, dioxanyl, piperidyl, pyrrolidinyl and ethoxy-ethoxyethyl group. These oxyhydrocarbon radicals preferably contain 1 to 10 carbon atoms.
Specific examples of usable silanes are

π y-methacryloxypropyltrimethoxysilane, j3- (3,4-epoxycyclohexyl) ethyltrimethoxysilane and γ-glycidoxypropyltrimethoxysilane. The silanes can also be used in a mixture. Furthermore, additional connections that are used with the functional parts

2Ii groups of component (b) condensable or «! ■ are polymerizable.

The molar ratio of metallesitr to the reactive Silanes depends on the composition of the coating material. When using titanium star and

The molar ratio is generally 2Ί epoxysilanes 2: 1 to 1: 7, preferably 1: 4. When using Titanium star and acryloxysilane is the molar ratio 1: 3 to 1:15, preferably 1: 3 to 1: 7 and in particular about 1: 4. Further molar ratios of

«Ι Metal esters to reactive silanes are in Table I. summarized.

Table I.

Coverage measure Molecular relationship between metal esters and reactive silane preferred area particularly wide range more preferred area I: 2 to I: 5 I: 4 Al-ester / epoxy lan 1: I to 1: 5 I: 2 to I: 5 I: 4 Al-ester / acryloxysilane 1: I to I: IO I: 4 I: 4 Zr * ester / epoxysilane I: 3.5 to I: 4.5 I: 4 1: 4 Zr ester / acryloxysilane 1: 3.5 to 1: 4.5

The coating compounds can also contain conventional additives, for example pigments or dyes, Solvents (for component a), other viscosity regulators and spreading agents.

Furthermore, the coating composition can contain curing accelerators, fillers and polymeric modifiers be incorporated.

To reduce the viscosity of the coating composition, solvents can be added, such as lower alcohols, lower carboxylic acids, halogenated hydrocarbons or aromatic hydrocarbons, such as ethanol, methanol, tert-butanol, chloroform, methylene chloride, acetic acid, toluene, benzene, Xylene, trichloroethane and 1,2-dichloroethane. The amount of the added solvent depends on the metal ester used and the viscosity of the Coating mass from.

To increase the viscosity of the coating compound, oligomerized silanes can be added in an amount of 1 to 20 percent by weight, based on the coating compound. For example increases y-Melhacryloxypropyl-trimethoxysilane, which has been beforehand / polymerized via a free Radikalmechanisn us 20 minutes at 100 ⁰ C, and then diluted to a 50 percent solution in ethanol, the viscosity of the Beschichtungsmasce.

Leveling agents (surfactants) can also be used with advantage. Specific examples of usable Leveling agents are silicone-based surfactants and fluorocarbon-based surfactants. Preferably these are Leveling agent in an amount of approximately 0.3 percent by weight, based on the coating mass, admitted. However, larger or smaller amounts can also be added.

In general, the coating compound is passed through a 10-microphone filter after it has been produced filtered.

According to the invention, the coating compound is applied to substrates made of plastic or metal! applied to to give them abrasion resistance, solvent resistance and corrosion resistance. In general can use both rigid and flexible substrates

be coated. Soft base materials, such as Plastics can be made scratch-resistant and abrasion-resistant. Examples of this are lenses for glasses. Sunglasses, optical instruments, lamps, watch crystals, plastic discs, signs and decorative Surfaces. Metal surfaces can be made corrosion-resistant, with the gloss on decorative metal strips and the surface of mirrors can be preserved. Furthermore, the Coating mass can be colored and applied as a paint on surfaces.

Those base materials to which the coating compound no gulc shows natural adhesion, can still be coated well, though its surface is first pretreated, for example by roughening the surface (mechanically, by solvents, by chemical etching. Oxidation, etc.) and applying a primer.

The coating compound can be applied to the substrate in jeuci girwüiisciiicii thickness uüfgciiugcii wciueii. !> (. · Layers 3 to 5 microns thick give excellent abrasion resistance. However, thicker coatings (up to 20 microns and more) can be obtained by applying more layers to the substrate. This can be achieved by using first applying a layer of the coating compound to the substrate and then partially hardening it, for example by heating to about 75 ° C. for one minute. Then a second layer can be applied. This process can be repeated until the desired thickness of the coating is achieved. These multiple coatings show a significantly higher abrasion resistance than a single coating.

The coating can be cured by various methods, for example by Heat, ultraviolet light, or electron beams. The method to be used depends on the coating mass and the substrate to be coated.

All coating compositions used according to the invention can be cured by the action of heat. The curing time and temperature depends on the type of coating compound. For example, the acryloxysilane metal Lester coating compositions need Aushärungszeiten of 30 to 60 minutes at Temperaluren from 130 to 170 ⁰ C, preferably at about 150 ⁰ C. In contrast, epoxysilane Metallestcr coating compositions can within about 16 at temperatures of 75 to 100 ° C to Cured for 40 hours. An increase in the curing temperature shortens the curing time.

The curing "" eit of the coating compound in the The temperatures mentioned can be significantly reduced by adding a small amount of an accelerator will. The accelerators are preferably used in an amount of about 0.4 to 2.5 percent by weight, based on the coating mass, used. Specific examples of accelerators that can be used are Mineral acids such as hydrochloric acid, nitric acid or sulfuric acid, and also Lewis acids such as boron trifluoride and aluminum trichloride.

All coating compositions that contain titanium esters can be irradiated with ultraviolet light Harden. The irradiation should preferably be carried out under a protective gas such as nitrogen, carbon dioxide or helium or argon, since oxygen inhibits curing. The one used to cure the coatings necessary time changes inversely with the intensity of the light. For example, the irradiation with light from a 275 watt UV lamp through a quartz glass filter into a chamber flushed with nitrogen, containing the coated substrate. The quartz glass filter is permeable to ultraviolet Light in the range of approximately 2000 to 4000 Å units. The curing time can take 5 to 20 Minutes depending on the distance of the light source from the substrate. Acryloxysilane metal ester coating compositions can also be hardened by irradiation with electron beams. Here, too, the irradiation is preferably under a protective gas such as nitrogen, carbon dioxide, helium or argon. The hardening of the Coating time changes vice versa the strength of the electron beam source. The irradiation can be carried out, for example, that one leads the coated substrate through a chamber flushed with an inert gas, on you an electron tri;! i! is directed.

The coatings can be cured within 4 seconds.

The abrasion resistance of the coating obtained is demonstrated by the oscillating abrasion test. This test is carried out with the device shown in the figure.

The device 10 consists of a shaking plate 14 in a housing 12. The shaking plate 14 is with connected to a Μύίοι who swaying them back and forth drives via an arm 16. The shaker plate 14 oscillates at a frequency of 1.25 rev / sec and one 3.75 cm stroke.

A coated substrate 18 to be examined is first firmly attached to the top of the shaking plate 14 Attached with the help of a double-coated strip. An abrasive 20 is applied against the coated surface 22 of the substrate 18 and pressed against the bottom of an abrasive block 24 with the help of a double-coated Strips attached. The abrasive 20 is made of No. 3/0 steel wool. The bottom 26 of the sanding block 24 measures 2.5 cm by 2.5 cm and the area of abrasive 20 that is in pressure contact with surface 22 is therefore about 2.5 cm 2.5 cm. The desired abrasion force is controlled by the Weights 28 which are placed on a rod 30 and supported by a ring 32. The rod 30 is with connected to the grinding block 24. The weights 28 are with the help of a bearing 34 directly above the Grinding block 24 held by arms 36. The bearing 34 allows unrestricted vertical movement, while preventing horizontal movement of the sanding block 24.

The abrasion resistance is measured by placing a coated substrate 18 as described above attached to the top of the rocker plate 14, the abrasive 20 against the coated surface 22 presses and applies a predetermined grinding force with the help of the weights 28. Then the shaker plate 14 set in motion. The number of complete oscillating movements is counted with the aid of a counter 38. After 100 cycles (1 cycle includes a complete forward and backward movement) the oscillating Shake plate stopped and the surface 22 of the coated substrate 18 visually inspected for scratches. The weights 28 are then either gradually increased or decreased, and that The procedure is repeated with a new, unpolished test sample.

The maximum weight (including sanding block 24. Rod 30. Ring 32 and weights 28). that the Abrasive 20 can be applied without any visible scratches on the test sample after 100 cycles cause is recorded.

The value for the abrasion resistance can be given in g / cm ² .

The adhesive strength of the cured coating on the substrate is determined as follows: A sharp blade is used to make a series of parallel incisions about 0.318 cm apart in the coated surface. and made another similar series of incisions at right angles thereto, also about 0.318 cm apart. So about 50 squares are cut into the cured coating. A piece of adhesive tape is pressed firmly onto the coated surface so that the entire cross-cut area is covered. The tape is then removed by hand from the substrate idSLM augir / .ijgcii at an angle of 90 " . The HiififeMigkeii is given in values from 0 to 100%. reduced.

The following examples illustrate the invention. Parts and percentages relate to weight, unless stated otherwise.

Table Il Example I.

Tetraisopropyl titanate and j'-methacryloxypropyltrimpthoxysilane are mixed in a molar ratio of 1:10 and stirred at room temperature. The coating massc is placed on a plate made of polydiallyl glycol carbonate and exposed to ultraviolet light cured within 15 minutes.

The 3 to 5 micron thick coating is smooth, clear, transparent, firmly bonded to the substrate and abrasion resistant.

The experiment is carried out with a molar ratio of the components of 1: 4 with comparable results repeated.

Examples 2 to 8

Aluminum isopropoxide (0.1 mol) is heated to the melting point (117 to 120 "C) and dissolved in 80 g of toluene at a temperature of 80 ° C. The dissolution takes 1/2 hour, and the solution is filtered through a Whatman filter paper No. 1. The solution is then mixed iiiii y-GiyuiHiÄVjü'ujiyiii iiMcinOXySilän in the molar ratio given in Table II, applied to 5x5x0.16 cm polydiallylglycol carbonate plates and cured for 16 hours at 85 ° C. The coatings obtained (3 to 5 microns ) are clear, flat, transparent and abrasion-resistant.

The results are summarized in Table II.

Hot example

2

Molar ratio metal ester / u reactive silane 1: 1 1: 2 1: 3 1: 4 1: 5 1: 7 1:10

Abrasion resistance, g / cnr 704 1056 1408 1760 1408 352 0

■; '' ■ ti

Examples 9-18

Aluminum isopropoxide is dissolved in toluene as described above and mixed with j'-melhaeryloxypropyltrimethoxysilane offset. The mixture is applied to plates made of polydiallyl glycol carbonate and in one Oven hardened at 150 ° C for 60 minutes. All coatings are clear, just unc '. transparent. In Table III the results are summarized.

Table III

example 10 Il 12th 13th 14th 15th 16 17th 18th 9 I: 2 1: 3 1: 4 1: 5 1: 7 I: 10 1: 15 1:20 1:30 Molar ratio of metal ester to 1: 1 reactive silane 2112 1197 1760 845 1056 845 704 704 493 Abrasion Resistance, kg, g / cm 845 100 100 100 100 100 100 100 100 100 Adhesion strength,% 100

Example 19

A 5 cm 5 cm χ 0.64 cm plate made of a polycarbonate made of bisphenol A and phosgene is made with washed with anhydrous ethanol and then dried with a lint-free cloth. Sodaine becomes a coating compound the following composition applied:

Tetraisopropyl titanate 2g y-Glycidoxypropyltrimethoxysilane 3g y-methacryloxypropyltrimethoxy- silane 3g Conc. Hydrochloric acid 4 drops Silicone-based leveling agent 1 drop

The plate is heated ^{to 150 °} C. in an oven for 15 minutes. For complete curing, the coated plate is placed in a chamber flushed with nitrogen and irradiated with ultraviolet light. The cured coating (about 3 to 5 microns thick) is clear, flat, transparent, firmly bonded to the substrate and very resistant to abrasion.

Examples 20 to 29

There are coating compounds made of tetraisopropyl titanate and j'-Methacryloxypropyltrimethoxysüan in different molar ratios in beakers at room temperature. The coating masses obtained are then referred to in example 19

used plastic plate !! applied and cured. The cured resealings (about 3 to "5 microns thick) are clear, flat, transparent, and firm to the

10

Substrate bound. They are very solvent-resistant and corrosion-resistant. In Table IV are the results / usammcngefalii.

Table IV

Hupiel 21 22nd I: 4 24 25th 2 B 27 2X 2 ') 20th I: 2 I: 3 I: 5 I: 7 I: 10 I: 15 I: 20 I: 30 Molecular ratio of metal ester to 1: 1 2112 reactive silane 211 1056 100 ! 760 1056 ^l ) H5 704 633 211 Abrasion resistance, g / cm ' 140 100 100 100 100 100 100 100 100 Adhesion strength,% 100

Examples 30 to 38

Coating masses are prepared from tetraisopropyl litanate and v-Olv ('irlnxynrnnv! Lnmcfhnvvsjl: in' Π ^v cr different molar ratios in beakers at room temperature. The coating masses obtained are applied to plates made of polydiallyl glycol carbonate and, according to Example I, at a distance of about 7 minutes , 5 cm irradiated with UV light. Then have the curing gene by I6stündi urs Frhil / rn UiIfR ¹ I ⁰ C "vrrvnlktänrlipl. the Rrsrhirhliin similar properties to the above-mentioned coatings. In Table V, the results are summarized.

Table V

example 31 32 .13 34 35 36 37 3 X 30th I: 1.5 I: 4 I: 5 I: 6 I: OK 1:15 I: 20 I: 30 Molar ratio of metal esters to 1: 0.5 reactive silane 2253 2464 1408 1267 281 422 211 140 Abrasion resistance, g / cm ³ 2253 100 100 100 100 100 100 100 100 Adhesion strength,% 100

Comparative Examples Λ and B

Substrates coated with commercially available coating compositions were made with the aid of the oscillating Abriebsvorrichlung examined with regard to their abrasion resistance. The results are summarized in Table VI.

Table VI

Comparative example Λ

Ii

Coating compound
Substrate

Abrasion resistance, g / cm ²

Melamine resin
Made of polycarbonate
Bisphenol A and phosgene

140

Silicone fluorocarbon resin
Polymethyl methacrylate

704

Example 39

A 5 cm by 5 cm by 0.16 cm plate of polydiallyl glycol carbonate is washed with anhydrous ethanol and dried with a lint-free cloth. A coating compound of the composition given below is placed in a beaker at Produced at room temperature and applied to the substrate.

Tetraisopropyl titanate 1.75 g

γ-glycidoxypropyltrimethoxysilane 6.0 g

Boron trifluoride ether complex 4 drops

Silicone-based flow control agent 1 drop

The coated substrate is placed in a chamber flushed with nitrogen and, as in Example 1, irradiated with UV light for 4 minutes at a distance of 7.5 cm. Curing is then completed by heating to 85 "C for about hours. The resulting coating (about 3 to 5 microns thick) is clear, transparent and firmly bonded to the substrate. The coating is also very abrasion-resistant (it shows an abrasion resistance of 1760 g / cm ² ) very solvent-resistant and very corrosion-resistant.

Example 40

33 g of zirconium isopropoxide are dissolved in 167 g of toluene at 75.degree. The warm solution is using

Il

a Buchner funnel and Whatman filter paper No. I filtered.

A 5 cm by 5 cm by 0.16 cm plate of polydiallyl glycol carbonate is washed with anhydrous ethanol and dried with a lint-free cloth. A coating measure of those given below Composition is prepared in a beaker at room temperature and placed on the substrate applied.

Zirconium isopropoxide toluene solution 12.0 g

y-methacryloxypropyltrimethoxy-

silane 6.0 g

Leveling agent based on silicone I drops

The coated substrate is cured for 60 minutes at 140 ° C. The coating obtained (about 3 to 5 Micron thick) is clear, flat, transparent and firmly bound to the substrate. The coating is also abrasion-resistant (it shows an abrasion resistance of 845 g / O IT »2 ^ caIit löct iniTfiTiil Inlkinctnn / luT nn / l ml-tf LrtrrKii'int '

Example 41

A coating composition is made using partially hydrolyzed tetraisopropyl titanate. The tetraisopropyl titanate is hydrolyzed as follows:

a) 4.7 g of 37 percent (concentrated) hydrochloric acid 67 g of anhydrous ethanol are added;

b) 28.4 g (0.1 mol) of tetraisopropyl titanate are in the Solution (a) given.

The hydrolysis is carried out at room temperature for about 15 minutes. The following components are then mixed together at room temperature.

Hydrolyzed Tetraisopropyl Titanium

Solution 5.0 g

y-methacryloxypropyltrimethoxysilane b.O g

Silicone-based leveling agent 0.2b g

Example 42

A 5 cm by 7 cm by 0.16 cm plate of aluminum is cleaned with an abrasive pad and water, washed with anhydrous ethanol and dried with a lint-free cloth. The coating composition of Example 42 is applied to the surface of the Aluminum plate applied and cured at 150 ° C for 60 minutes. The coating obtained (about 3 to 5 Micron thick) is clear, flat, transparent, abrasion-resistant and firmly bonded to the substrate.

Example 43

Polyester plates are etched with a dilute solution of sulfuric acid in anhydrous ethanol. The coating compound from Example 42 is applied to the etched polyester plates and ^{cured at 150 °} C. for 60 minutes. The resulting coatings (about 3 to 5 microns thick) are clear. flat, transparent, abrasion-resistant and firmly bonded to the substrate.

Example 44

Acrylic polymer sheets are pretreated by

a) immersion in chloroform for 2 minutes,

b) immersion in dichloromethane (30 seconds at 25 ° C),

c) Roughening the surface with fine sandpaper.

d) Roughening the surface with aluminum oxide grinding powder

and then each coated with the coating kinase from Example 42 and ^{cured at 150 °} C. for 60 minutes.

The coatings obtained (about 3 to 5 microns thick) are clear, even, transparent, scratch-resistant, solvent-resistant and firmly bound to the substrate.

Example 45

A 5 cm by 5 cm by 0.16 cm pintle made of polydiallyl glycol carbonate is washed with anhydrous ethanol and dried with a lint-free cloth, ι "· A coating compound of the following composition

Teiraisopropyl titanate 2 g

y-methacryloxypropyltrimethoxy-

silane 6 g

Leveling agent based on silicone! Drops

is then applied to the plate and cured according to Example 41 within about 8 seconds. the The resulting coating (about 3 to 5 microns thick) is clear, flat, transparent, resistant to abrasion and solvents - '"> and is firmly bound to the substrate.

Example 46

A coating mass of tetraisopropyl titanate and γ-methacryloxypropyltrimethoxysilane in the molar

iii ratio I: 4 is on a plate made of the polycarbonate according to Example! 19 applied and ^{heated to 150 0} C for 20 minutes and then irradiated for 15 minutes with UV light at a distance of about 7.5 cm.

π The solvent resistance of the cured coating is determined as follows: four or five small pools of solvent are placed on the Applied to the surface of the plate and allowed to act for about 20 minutes. Subsequently, the laugh

in wiped dry, and the surface of the coating visually examined for damage. It was found that the coating of the following solvents is not attacked:

a) water

b) ethanol

c) methanol

d) acetone

e) 2-butanone

f) chloroform g) dimethylformamide h) conc. hydrochloric acid i) toluene

Example 47

A 10 cm by 10 cm by 0.13 cm sheet of polyester is primed with a solution of amidated and epoxidized polybutadiene in methanol. then becomes a coating compound of the following composition

Tetraisopropylthiyanate 2.0 g

γ-glycidoxypropyltrimethoxysilane 6.0 g Silicone-based flow control agent 1 drop

applied to the plate and partially at 75 ° C for 1 minute hardened. The coated plate is cooled to room temperature (25 ° C) and covered with a second layer the coating compound provided. The coating is cured at 75 ° C for 16 hours.

The coating (about 8 microns thick) is clear, flat, flexible, transparent, and is firm to the substrate bound. The coating is also abrasion resistant (they

shows an abrasion resistance of 1408 g / cm ³ ), very solvent-resistant and very corrosion-resistant.

Examples 48-51

These examples explain the use of various Metal esters that contain at least two ester groups per metal atom.

36 g of y-glacidoxypropyltrimethoxysilane are used in 3 Shares A, B and C divided. Part A is 5.0 g Triethanolamine chelate of bis-titanium isopropoxide

[(OHCH ₂ CH ₂ J ₂ N] ₂ Ti (OC ₃ H ₇ ):.,
Part B with 8.5 g of dichlorodibutoxytitanate solution

and Part C with 8.0 g of chlorodibutoxyaluminum solution

ClAI (O (CHj) ₃ CH i) j added.

The metal esters of B and C are as solutions in Methyler.clilorid with a solids content of 25 Weight percent added. 2 drops of an oligomeric leveling agent based on fluorocarbon are used as Coating auxiliaries added.

The coating solution D is made from 6.0 g of γ-glycidoxypropyltrimethoxysilane and 4.5 g of a polymeric titanate with basic building blocks of the formula

O- (CH ₂ )., CH.,

O- (CH ₂ ), CH.,

prepared and mixed with a drop of flow control agent.

Polydiallyl glycol carbonate plates (approximately 7.7 7.7 χ 0.16 cm) are washed with anhydrous ethanol washed and dried with a lint-free cloth. The coating solutions are applied to the plates applied and cured in an oven at 85 ° C for 16 hours.

The coatings obtained are in all cases flat, transparent, solvent-resistant and have a very good appearance good abrasion resistance against steel wool No. 3/0.

1 sheet of drawings

Claims (1)

Claim: Process for the production of abrasion-resistant coatings on plastic or metal substrates, characterized in that the optionally precoated with a primer substrate from a coating composition a mixture of a) a titanium, aluminum or zirconium ester with at least two ester groups of the formula —OR on the metal atom, where R is a hydrocarbon radical with 1 to 18 carbon atoms means, b) an epoxy and / or acryloxylsilane and optionally c) customary additives and / or fillers applies and cures by exposure to UV light and / or electron beams and / or heat.