DE2544860B2 - Process for the production of abrasion-resistant coatings on plastic or metal substrates - Google Patents

Description

It is often necessary to protect sensitive surfaces by coating them with a protective paint To protect against abrasion. There are numerous publications in the field of protective anti-abrasion coatings 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 glass fibers with a solution or Dispersion containing an olefin homo- or copolymer, an organotitanium compound, preferably an orthotitanate, in combination with an unsaturated silane, an epoxysilane or an aminosilane as well optionally contains a plasticizer, described.

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 together with pigments and other common additives without a polymeric binder as a paint be used.

The invention is based on the object of a method for producing abrasion-resistant coatings On plastic or metal substrates to create paints with good corrosion and solvent resistance which 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 producing 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 through ester groups saturated, but other groups can also be present as long as at least two ester groups available. There can be compounds of the general formula

R _n '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, η has the value 0.1 or 2, (m — n) at least the value 2 and R 'denotes an organic or inorganic group bonded to M or a complexing agent for saturating the free valences of M. Compounds of the general formula

M (OR) "

are generally preferred for their ready availability and advantageous properties. R preferably denotes an alkyl or acyl radical having 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 is so largely hydrolyzed, the ambifunctional silane and the metal ester fall together in insoluble form because the reactive sites for the silane on the ester are missing.

Component (a) of the coating composition should preferably 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 fails. The use of hydrolyzed components has the further disadvantage that an additional step in 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

[R '] "- Si- [R2] ₄ _"

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

CH ₂ = CCOR ³ -

R ⁴ O

in which R ^{3 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-Rf ₁₁ -

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, consisting 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 (CH2CH2O) * Z, in which Z is an aliphatic hydrocarbon radical with fewer than 10 carbon atoms or a hydrogen atom and k 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, assuming CH3CH2OCH3, the oxyhydrocarbon radical can have the formula

-O-CH2CH2OCH3

to 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,

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

γ-methacryloxypropyltrimethoxysilane, /? - (3,4-epoxycyclohexyl) ethyltrimethoxysilane and γ-glycidoxypropyltrimethoxysilane. The silanes can also be used in a mixture. Furthermore, additional connections be used with the functional

Groups of component (b) are cocondensable or copolymerizable.

The molar ratio of metal ester to reactive silanes depends on the composition of the coating material away. When using titanium star and

The molar ratio of epoxysilanes is generally 2: 1 to 1: 7, preferably 1: 4. When using The molar ratio of titanium esters and acryloxysilane is 1: 3 to 1:15, preferably 1: 3 to 1: 7 and especially about 1: 4. Further molar ratios of

Jo metal esters to reactive silanes are given in Table I. summarized.

Table I.

Coating compound

Molar ratio of metal ester to reactive silane
wide range preferred range

particularly

more preferred

area

Al-ester / epoxysilane
Al-ester / acryloxysilane
Zr ester / epoxysilane
Zr ester / acryloxysilane

1: 1 to 1: 5

1: 1 to 1:

: 3.5 to 1: 4.5

: 3.5 to 1: 4.5

1: 2 to 1: 5
1: 2 to 1: 5
1: 4
1: 4

1: 4
1: 4
1: 4
1: 4

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

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

To reduce the viscosity of the coating compound Solvents can be added, such as lower alcohols, lower carboxylic acids, halogenated ones Hydrocarbons or aromatic hydrocarbons such as ethanol, methanol, tert-butanol, chloroform, Methylene chloride, acetic acid, toluene, benzene, t> o Xylene, trichloroethane and 1,2-dichloroethane. The amount 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, γ-methacryloxypropyl-trimethoxysilane increases. ^{which was previously polymerized at 100 °} C. for 20 minutes via a free radical mechanism and then diluted to a 50 percent solution in ethanol, the viscosity of the coating material.

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.

Generally, after the coating is made, it is passed through a 10 micron filter filtered.

According to the invention, the coating compound is applied to substrates made of plastic or metal in order 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 will. Examples are lenses for glasses, sunglasses, optical instruments, lamps, watch crystals, Plastic discs, signs and decorative surfaces. Metal surfaces can be corrosion resistant be equipped, with the shine on decorative metal strips and the surface of Mirroring can be preserved. Furthermore, the coating composition can be colored and used as a paint Surfaces are applied.

Those base materials to which the coating compound does not exhibit good natural adhesion, can nevertheless be coated well if their surface is first pretreated, for example by roughening the surface (mechanical, solvent, chemical etching, oxidation etc.) and applying a primer.

The coating composition can be applied to the substrate in any desired thickness. Coatings 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 applying firstly a layer of the coating composition onto the substrate and then partially cured, for example by Iminütiges heating to about 75 ⁰ C. Subsequently, a second layer is applied. This process can be repeated until the desired coating thickness 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 temperatures of 130 to 170 ° C, preferably at about 150 ⁰ C. In contrast, epoxysilane Metal Lester coating compositions can within about 16 at temperatures of 75 to 100 ⁰ C to Cured for 40 hours. An increase in the curing temperature shortens the curing time.

The curing time of the coating compound at the temperatures mentioned can be increased by adding a small amount of an accelerator can be reduced significantly. The accelerators are preferred used in an amount of approximately 0.4 to 2.5 percent by weight, based on the coating composition. Specific examples of accelerators that can be used are mineral acids such as hydrochloric acid, nitric acid or Sulfuric acid, also Lewis acids, such as boron trifluoride and aluminum trichloride.

All coating compositions which contain titanium esters can be removed by irradiation with ultraviolet light Harden. The irradiation should preferably be carried out under a protective gas such as nitrogen or carbon dioxide. helium or argon, since oxygen inhibits curing. The one used to cure the coatings necessary time changes it., inversely to the intensity of the light. For example, the irradiation with the light of 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 cured 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 inversely with the strength of the electron beam source. The irradiation can be carried out, for example, that the coated substrate by an inert gas flushed chamber leads to which an electron beam 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 motor that oscillates them back and forth

jo drives an arm 16. The shaker plate 14 oscillates at a frequency of 1.25 rev / sec and a stroke of 3.75 cm.

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

• Ti weights 28, which are placed on a rod 30 and by a ring 32 can be supported. The rod 30 is connected to the grinding block 24. The weights 28 are supported by arms 36 directly above the sanding block 24 with the aid of a bearing 34. The camp 34 allows unrestricted vertical movement while there is horizontal movement of the sanding block 24 prevented.

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

hi) movements are counted with the aid of a counter 38. After 100 cycles (1 cycle includes a complete forward and backward movement) the oscillating Shaking plate stopped and the surface 22 of the coated substrate 18 visually checked for scratches.

(Vi seeks, the weights 28 are then either gradually increased or decreased, and the process is carried out with a new, not sharpened Test sample repeated.

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: With a sharp blade will make a series of parallel incisions in the coated surface, each about 0.318 cm apart, and another similar series of incisions at right angles to them, which are also about 0.318 cm apart, generated. So will be around 50 Squares cut into the cured coating. A piece of tape is firmly coated on the Surface pressed so that the entire cross-cut area is covered. The tape will then Quickly peeled off the substrate by hand at an angle of 90 °. The adhesive strength is given in Values from 0 to 100%. For each square removed during the test, the recorded value for the Adhesion strength reduced by 2%.

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

Table II example 1

Tetraisopropyl titanate and γ-methacryloxypropyltrimethoxysilane are mixed in a molar ratio of 1:10! and stirred at room temperature. The coating compound is applied to a plate made of polydiallyl glycol carbon and by irradiation with ultraviolet Lichl cured within 15 minutes.

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

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 and to the melting point (117 to 120 ° C) dissolved in 80 g of toluene at a temperature of 8O ⁰ C. Dissolution takes 1/2 hour and the solution is filtered through Whatman # 1 filter paper. The solution is then mixed with γ-glycidoxypropyltrimethoxysilane in the molar ratio given in Table II, applied to 5 × 5 × 0.16 cm plates made of polydiallyl glycol carbonate and cured at 85 ° C. for 16 hours. The coatings obtained (3 to 5 microns) are clear, flat, transparent and resistant to abrasion.

The results are summarized in Table II.

Example 2

Molar ratio of metal ester to reactive silane
Abrasion resistance, g / cm ²

1: 1
704

1: 1056 1: 3
1408

1: 4
1760

1: 5
1408

1: 7
352

1: 10 0

Examples 9 to

Aluminum isopropoxide is dissolved in toluene as described above, and γ-methacryloxypropyltrimethoxysilane is added. The mixture is applied to plates made of polydiallyl glycol carbonate and ^{cured in an oven at 150 1} C for 60 minutes. All coatings are clear, flat and transparent. The results are summarized in Table III.

Table III

example
9 10

11

12th

14th

16

17th

18th

Molar ratio of metal ester to
reactive silane
Abrasion Resistance, kg, g / cm
Adhesion strength,%

: 1 1: 2 1: 3 1: 4 1: 5 1: 7 1: 10 1: 15 1: 20 1: 30

845 2112 1197 1760 100 100 100 100

1056 845 704 704 493 100 100 100 100 100

Example 19

A 5 cm 5 cm χ 0.64 cm slab made from a Polycarbonate made from bisphenol A and phosgene is washed with anhydrous ethanol and then with a dried fiber-free cloth. A coating compound of the following composition is then applied:

Tetraisopropyl titanium 2g ) '- glycidoxypropyltrimethoxysilane 3g ) '- methacryloxypropyltrimethoxy- silane 3g Conc. Hydrochloric acid 4 drops Silicone-based leveling agent 1 drop

The plate is heated for 15 minutes in an oven at 15O ⁰ C. 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

bo clear, flat, transparent, firmly bound to the substrate and very abrasion resistant.

Examples 20 to 29

There are coating compounds made of tetraisopropylb5 titanate and j'-methacryloxypropyltrimethoxysilane in different molar ratios in beakers at room temperature. The coating compositions obtained are then referred to in example 19

used plastic plates applied and cured. The cured coatings (about 3 to 5 Microns thick) are clear, even, transparent and firmly attached to the

10

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

Table IV

example 21 22nd 23 24 25th 26th 27 28 29 20th 1: 2 1: 3 1: 4 1: 5 1: 7 1: 10 1: 15 1:20 1:30 Molar ratio of metal ester to 1: 1 reactive silane 211 1056 2112 1760 1056 985 704 633 211 Abrasion resistance, g / cm ² 140 100 100 100 100 100 100 100 100 100 Adhesion strength,% 100

Examples 30-38

There are coating compounds made of tetraisopropyl titanate and γ-glycidoxypropyltrimethoxysilane in various Molar ratios made in beakers at room temperature. The coating compositions obtained are applied to plates made of polydiallyl glycol carbonate and according to Example 1 4 minutes in irradiated with UV light from a distance of approximately 7.5 cm. Then the hardening takes 16 hours Heating to 85 ° C completed. The coatings have properties similar to those above mentioned coatings. Table V summarizes the results.

Table V

example
30 31

32

33

34

37

Molar ratio of metal ester to
reactive silane
Abrasion resistance, g / cm ²
Adhesion strength,%

: 0.5 1: 1.5 1: 4 1: 5 1: 6 1: 10 1: 15 1: 20 1: 30

2253 2464 1408 1267 281 422 211 140
100 100 100 100 100 100 100 100

Comparative Examples A and B.

There were coated substrates with commercially available coating compositions with the aid of the oscillating Abrasion device examined with regard to its abrasion resistance. The results are summarized in Table VI.

Table VI

Comparative example A.

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

) '- Glycidoxypropyltrimelhoxysilane 6.0 g

Boron trifluoride ether complex 4 drops

Leveling agent based on silicone I drops

Wl

b ^r >

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 8 hours. The resulting coating (approximately 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 was dissolved in 167 g of toluene at 75 ⁰ C. The warm solution is using

a Buchner funnel and Whatman No. 1 filter paper.

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.

Zirconium isopropoxide toluene solution 12.0 g

y-methacryloxypropyltrimethoxy-

silane 6.0 g

Silicone-based flow control agent 1 drop

The coated substrate is cured at 140 ° C. for 60 minutes. The resulting coating (about 3 to 5 microns thick) is clear, flat, transparent and firmly bonded to the substrate. The coating is also abrasion-resistant (it shows an abrasion resistance of 845 g / cm ² ), very solvent-resistant and very corrosion-resistant.

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 are mixed with 67 g of anhydrous ethanol;

b) 28.4 g (0.1 mol) of tetraisopropyl titanate are added to solution (a).

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

Hydrolyzed tetraisopropyl titanate

Solution 5.0 g

γ-methacryloxypropyltrimethoxysilane 6.0 g

Silicone-based leveling agent 0.26 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 60 minutes at 150 ° C hardened. The resulting coating (about 3 to 5 microns thick) is clear, flat, transparent, and abrasion resistant firmly bound to the substrate.

Example 43

Polyester panels are made with a dilute solution of sulfuric acid in anhydrous ethanol etched. The coating compound from Example 42 is applied to the etched polyester plates and 60 Cured for minutes at 150 ° C. The coatings obtained (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) 2 minute immersion in chloroform,

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

c) roughening the surface with fine sandpaper,

d) Roughening the surface with aluminum oxide abrasive powder

and then coated in each case with the coating composition from Example 42 and at 150 ° C. for 60 minutes hardened.

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

Example 45

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 following composition

Tetraisopropyl titanate 2 g

y-methacryloxypropyltrimethoxy-

silane 6 g

Silicone-based flow control agent 1 drop

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 composition of tetraisopropyl titanate and j'-methacryloxypropyltrimethoxysilane in a molar ratio 1: 4 is applied to a plate made of the polycarbonate according to Example 19 and 20 minutes Heated to 150 ° C and then 15 minutes with UV light at a distance of about 7.5 cm irradiated.

The solvent resistance of the cured coating is determined as follows: four or five small puddles of solvent are applied to the surface of the plate and take about 20 minutes allowed to act. Then the pools are 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 χ 10 cm χ 0.13 cm sheet made of polyester is coated with a solution of amidated and epoxidized polybutadiene primed in methanol. Then a coating compound of the following composition

Tetraisopropyl titanate 2.0 g

γ-glycidoxypropyltrimethoxysilane 6.0 g Leveling agent based on silicone! Drops

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 give away the coating compound. The coating is cured at 75 ° C for 16 hours.

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

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

Examples 48 to 51

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

36 g) '- giacidoxypropyltrimethoxysilane are divided into 3 parts A, B and C. Part A is 5.0 g Triethanolamine chelate of bis-titanium isopropoxide

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

Cl ₂ Ti (O (CH ₂ ) ₃ CH ₃ ) 2 "

and Part C with 8.0 g of chlorodibutoxyaluminum solution

CIAl (O (CH ₂ ) jCH ₃ ),
offset. : a

The metal esters of B and C are as solutions in methylene chloride 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> '-glycide oxypropyltrimethoxysilane and 4.5 g of a polymeric titanate with basic building blocks of the formula

O- (CH ₂ )., CH.,

0- (CH ₂ IjCH.,

made and mixed with a drop of the middle of the gradient.

Plates made of polydiallyl glycol carbonate (about 7.7 7.7 0.16 cm) are coated with anhydrous ethano washed and dried with a lint-free cloth. The coating solutions are applied to the planner 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 it is optionally precoated with a primer Substrate 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 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.