NL1015865C2 - Colored coating. - Google Patents

Description

Colored coating.

The present invention relates to a colored coating with a transparent lacquer containing transparent particles in a single layer, wherein the layer thickness of the transparent lacquer is smaller than the thickness of the transparent particles, in particular for a plate-shaped construction element.

U.S. Pat. No. 2,963,378 discloses a reflective coating in which transparent glass balls with a diameter of 10 to 50 µm are embedded in a transparent lacquer. According to this American publication, it is essential that the glass beads comprise a reflective metallic coating over a hemisphere in order to achieve a strong reflection. In the cover layer, several millions of such glass balls provided with a reflective layer are kept per cubic inch.

The glass balls, which are provided with a reflective layer, according to the said American patent, provide a strong reflective effect of the cover layer. The glass balls are no longer transparent and can only reflect the incident light. It is not possible to change the color of the cover layer with the aid of the covering layer according to the said American patent.

It is the object of the present invention to provide the surface of a plate-shaped structural element with a coating such that it shows a different color depending on the angle at which one looks at the surface.

This object is achieved according to the invention in that the transparent lacquer has a different color from the basic color of the surface of the plate-shaped structural element, that the proportion of the surface provided with transparent particles is between 10% and 50% of the total surface and that the basic color of the surface 25 is visible through the transparent particles.

In the case of a structural element coated in this way, the basic color of the surface is visible through the transparent particles, while in the area of the surfaces provided with a transparent lacquer a mixed color appears consisting of the basic color and the color of the paint. It is clear that the surface of the plate-shaped construction element can comprise a thin layer of basic color.

If one looks in the direction transversely to the plane, then essentially the ground color visible through the transparent particles appears. With an oblique viewing direction, mainly the mixing color appears, and with a flat viewing direction (along the plane)] & 15 8 § s

I 2 I

I appears essentially in the color of the transparent lacquer. Thus one of the I is created

I view direction dependent changing color effect. In particular with a construction I

I element with a profiled surface, for example with a roof tile with flat water

I drain and round ribs arranged between them or at a roof tile with a waveform

If the surface area is 5 mig, the surface structure comes as a result of the difference

I lending color impressions clearly forward. I

I Depending on the choice of the base color and the color of the transparent lacquer

I desired color combinations can be achieved. A red base color and a blue I

For example, transparent lacquer lead to different I depending on the viewing direction

I 10 violet color tones. A red base color and a red-brown transparent lacquer distract I

Depending on the viewing direction to various chestnut-colored hues. I

It should be noted that from U.S. Pat. No. 2,354,018, a reference I

A reflective foil is known on which glass balls lie next to each other. The bullets are I

I according to this American publication so close together that it is a continuous I

Forming a surface layer. The glass balls are embedded in a flexible layer. I

The object of the present invention cannot be achieved with the cover layer I

I which is known from the aforementioned US patent US 2.354.018, because the glasses I

I balls form a continuous coating. In contrast to this known coating, I

Surface that I. Shares between the transparent particles in the cover layer according to the invention

I 20 cannot be covered with transparent particles. Moreover, the transparent part I

Icels according to the present invention embedded in a transparent lacquer layer, wherein I

A certain color can be given to the transparent lacquer layer. These characteristics I

I cannot be derived from the aforementioned document US 2.354.018. I

The varying color effect of the coating depends on the proportion of the total

Ial surface that is provided with transparent particles. Preferably it is I

I share that the transparent particles make up the total area between 10% and I

I 50% of the total area. In the for use in the coating according to the invention

I transparent lacquer therefore contains relatively few transparent particles, so that more I

Any other transparent particles cannot come to lie on top of each other. Forming I

Agglomerates of transparent particles depend on the method used

I for applying the coating. I

The transparent particles are preferably colorless. However, colored I

I transparent particles are used, creating extra color effects. I

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An optimum alternating color effect is achieved if the transparent particles comprise a substantially constant size. In this way a uniform color effect, which only depends on the viewing direction, is achieved

A coating layer which is particularly advantageous for cost reasons is possible when the transparent particles are substantially spherical. Here it is possible to use glass balls or glass beads.

Preferably the diameter of the spherical transparent particles is in the range between 30 µm and 500 µm. The diameter of the spherical transparent particles must not be more than approximately three times the thickness of the cured lacquer layer. In this way, on the one hand, weatherproof encapsulation of the transparent particles is achieved, and on the other hand, only a thin layer of lacquer is required.

Transparent lacquers according to the invention consist of organic or inorganic materials. Organic materials are polymers, for example acrylates or styrene acrylates, which can be applied as aqueous acrylate dispersions or aqueous styrene acrylate dispersions. It is clear that polymers dissolved in organic solvents can also be used. Solvent-free two-component systems such as polyurethanes are also suitable. For applications where a particularly high resistance to ultraviolet rays is required, the transparent lacquer may consist of organic material. Systems based on silica sol or water glass are particularly suitable for this purpose.

The embodiment of the invention is described below with reference to seven exemplary embodiments.

Embodiment example 1

On a plate-shaped structural element, namely a hardened concrete roof brick with a first color layer with a red base color, after curing this first color layer a cover layer is applied which consists of a transparent lacquer with transparent particles contained therein. Colorless glass balls are used as transparent particles. . The transparent lacquer used is 100 g of an aqueous acrylate dispersion with a solids content of 40% by weight, to which 10 g of an aqueous pigment suspension with a content of 5 g of blue cobalt-Spinell pigment was added. To 110

4 I

g of this blue pigmented acrylic dispersion was 15 g of glass balls with an I

diameter of 90 µm ± 20 µm added. Of the finished coating mixture, 115 l

g / m2 sprayed on the concrete roof brick. After the sprayed layer has hardened, I

there is a layer of transparent lacquer with an average thickness of I between the glass balls

5 is approximately 30 µm, the thickness of the I being formed due to the capillary force

the layer adjacent to the glass balls is slightly larger, so that the glass balls are affected by weather

fixed. In this first example, the glass balls covered about 1

10% of the coated surface. I

10 Example of implementation 2 I

On a hardened concrete roof brick with a first color layer with a red base I

After the first color layer has hardened, a coating is applied which is made from an I

transparent varnish containing colorless glass balls. As transparent I

15 lacquer became 100 g of an aqueous acrylate dispersion with a solids content of 40 l

% by weight, to which 10 g of an aqueous pigment suspension with a content of I

0.5 g black iron oxide pigment (Bayfeirox 306) and 4.5 g red-brown iron oxide pigment

ment mixing (Bayferrox 655) were added. To 110 g of this dark red I

brown pigmented acrylic dispersion became 45 g of glass balls with a slide

20 meters of 90 pm ± 20 pm added. 130 g / m2 I of the finished coating mixture

sprayed on the concrete roof brick. After the sprayed layer has hardened, I

between the glass balls a lacquer layer of transparent lacquer with an average thickness of about 1

40 µm, the thickness of the I being formed due to the capillary force

the layer adjacent to the glass balls is slightly larger, so that the glass balls are affected by weather

25 are permanently embedded. In this second example, the glass balls covered about 1

30% of the coated surface. I

Embodiment example 3 I

30 On a cured concrete roof brick with a first color layer with a red base I

After the first color layer has hardened, a top layer has been applied which is made from a layer

transparent varnish containing colorless glass balls. As transparent I

The varnish became 100 g of an aqueous acrylate dispersion with a solids content of 40 l

101 ^ 0 ^ 5 I

5% by weight, to which 2 g of an aqueous pigment suspension with a content of 1 g of blue cobalt-Spinell pigment was added. To 102 g of this blue pigmented acrylic dispersion was added S0 g of glass balls with a diameter of 90 µm ± 20 µm. 46 g / m2 of the finished coating mix was sprayed onto the concrete roof brick. After the sprayed-on layer had hardened, the average thickness of the transparent lacquer layer was approximately 14 µm. The glass balls covered about 12% of the coated surface.

Embodiment example 4 10

On a cured concrete roof brick with a first color layer with a red base color, after curing this first color layer, a cover layer was applied which consisted of a transparent lacquer with colorless glass balls contained therein. The transparent lacquer used was 100 g of an aqueous acrylate dispersion with a solids content of 40% by weight, to which 2 g of an aqueous pigment suspension with a content of 1 g of blue cobalt-Spinell pigment had been added. To 102 g of this blue-pigmented acrylic dispersion, 50 g of glass balls with a diameter of 90 µm ± 20 µm were added. 92 g / m2 of this finished coating was sprayed onto the concrete roof brick. After the sprayed-on layer had hardened, the average thickness of the transparent lacquer layer was approximately 35 µm. The glass balls covered about 24% of the coated surface.

Embodiment Example 5 After curing of this first color layer, a cover layer was applied to a cured concrete roof brick with a first color layer with a red base color, which layer consisted of a transparent lacquer with colorless glass balls contained therein. The transparent lacquer used was 100 g of an aqueous acrylate dispersion with a solids content of 40% by weight, to which 2 g of an aqueous pigment suspension with a content of 1 30 g of blue cobalt-Spinell pigment had been added. To 102 g of this blue-pigmented acrylic dispersion, 80 g of glass balls with a diameter of 90 µm ± 20 µm were added. 61.5 g / m2 of the finished coating mix was sprayed onto the concrete roof brick. After the sprayed layer had hardened, the average thickness was 1 .mu.m.

4 5 ^ ϋ V

I 6 I

I the transparent lacquer layer approximately 25 μηι. The glass balls covered approximately 25% of the I

I coated surface. I

I Embodiment example 6 I

I 5 I

I On a cured concrete roof brick with a first color layer with a red base I

After the first color layer has hardened, a cover layer is applied which consists of an I

There was a transparent varnish containing colorless glass balls. As transparent I

I lacquer became 100 g of an aqueous acrylic dispersion with a solids content of 40 l

I used 10% by weight, to which 2 g of an aqueous pigment suspension with a content of 1 l

1 g of blue cobalt Spinell pigment was added. To 102 g of this blue pig

The acrylic dispersion became 80 g glass balls with a diameter of 90 µm ± 20 µm

I I

added. From the finished coating mixture, 115.4 g / m was applied to the concrete roof brick

I sprayed. After the sprayed-on layer had hardened, the average thickness was I

The transparent lacquer layer approximately 60 µm. The glass balls covered approximately 47% of the I

I coated surface. I

I Example of implementation 7 I

With vigorous stirring, 360 g of a silica sol with 50% solids were added

I part with a BET surface of 160 m2 / g 20 g iron oxide pigment (Bayer BF 110), 600 I

I g glass balls with a diameter of 90 µm ± 20 µm and 40 g silicone resin (aqueous I

I emulsion with 50% solids content). From this mixture, 200 g / m2 I

I on a cured concrete roof brick with a first color layer with a black base color I

Sprayed. After curing the sprayed on inorganic layer, the average was 1

The thickness of the transparent lacquer layer is approximately 30 µm. The glass balls covered more I

I then 50% of the coated surface. I

In the drawing, a structural element I is provided with a coating

10 according to the invention shown in cross-section. A plate-shaped construction I

Element 12, here a concrete roof brick, comprises a first color layer 14 with a red base I

I color. This first color layer 14 is covered with a cover layer which is made of a transparent lacquer I

I I

7 16 with transparent particles 18 present There are glass balls used here as transparent particles 18.

Claims (7)

8 I Conclusions I 1. Colored coating with a transparent lacquer containing transparent particles in a single layer, the layer thickness of the transparent lacquer being smaller than the thickness of the transparent particles, in particular for a plate-shaped structural element, with the characterized in that the transparent lacquer (16) has a different color from the basic door of the surface of the plate-shaped structural element (12), that the proportion of the surface provided with transparent particles (18) is between 10% and 50% of the total surface area and that the basic color of the surface is visible through the transparent particles. I A colored coating according to claim 1, characterized in that the transparent particles (18) are colorless. I The colored coating according to claim 1 or 2, characterized in that the transparent particles (18) have a substantially constant size. I Colored coating according to one of claims 1 to 3, characterized in that the transparent particles (18) are substantially spherical. I 20 I The colored coating according to claim 4, characterized in that the diameter of the spherical transparent particles is in the range between 30 µm and 500 µm. I ^ The colored coating according to any of claims 1 to 5, characterized in that the transparent lacquer (16) consists of organic material such as acrylate or polyurethane. I Colored coating according to one of claims 1 to 5, characterized in that the transparent lacquer (16) consists of organic material such as silicon dioxide or silicate. I ******* I 1 0 1 ^ 9 $ £ I