WO2021118404A1

WO2021118404A1 - Method for producing an artistic decorative coating on the surface of flat cork panels

Info

Publication number: WO2021118404A1
Application number: PCT/RU2020/000724
Authority: WO
Inventors: Денис Александрович ФОМАХИН
Original assignee: Общество С Ограниченной Ответственностью "Корк Хаус"
Priority date: 2019-12-11
Filing date: 2020-12-17
Publication date: 2021-06-17
Also published as: RU2729759C1

Abstract

A method for producing an artistic decorative coating on the surface of flat cork panels comprises the application of paint, and in-process drying, wherein a decorative coating is applied to a pre-cleaned and pre-polished surface of a corkboard, followed by the application of at least one layer of a water-soluble, acrylate-based lacquer which is coloured or is mixed with a filler in the form of finely dispersed cork, with the moist coating being displaced with hand tools to produce a decorative image. The invention makes it possible to simplify the procedure, to reduce the cost of a finished article and to retain the ecological properties of a material, and also to produce various decorative surfaces, including imitating the natural texture of wood, stone and other natural materials on the finished article.

Description

A method of obtaining an artistic decorative coating on the surface of flat cork panels

TECHNICAL FIELD The invention relates to a manual method for producing decorative images, allowing to obtain multi-color and / or multi-colored coatings on the surfaces of flat cork panels, as well as flat panels, the front surface of which is made of cork material and can be used in the field of interior decoration.

Prior art

Currently, when decorating buildings and interiors, environmentally friendly materials are in demand. One of these materials is cork, which has a number of positive properties, such as sound insulation, elasticity, and durability.

Cork material does not cause allergic conditions, does not accumulate substances harmful to humans, cork coverings are not adapted for the life of insects. Cork, or cork oak bark, has unique properties due to the fact that it is ~ 90% composed of air, enclosed in sealed cavities made of strong and elastic material, retains its elasticity and restorability under heavy loads even in aggressive environments. Cork panels are made from crushed bark granules, pressed into blocks at temperatures above 350 C without adding glue, after which they are cooled with steam and then stabilized for at least two weeks, and only after that are cut into panels of various thicknesses. The bark of cork oak contains a natural binder called suberin. Cork panels can be pressed into blocks with large-pore or fine-pored cork with a top layer in the form of natural cork veneer with a thickness of 0.4-1.0 mm.

The upper cork layer in the form of cork veneer up to 3 mm thick can also contain laminated boards, where the middle layer is MDF, chipboard, fiberboard, fiber board, polymer layer and lower cork layer.

There is a sufficient number of materials, the application of a decorative image to which is problematic. These include cork material due to its characteristic uneven absorption of the dye.

The application of a decorative image to such a material is traditionally carried out with preliminary surface preparation for the subsequent application of a decorative image.

It is possible to apply a decorative coating to the cork surface in various ways.

Methods of coating the surface of a cork material using UV printing are known.

A known method of manufacturing a floor panel (RF patent N ° 2529239 dated 02/09/2012, conventional priority: 02/22/2011, DE 102011012015.7, publ. 05/27/2014), containing a base plate, cork layer, soil and decorative layer. The method consists in the fact that for the formation of the soil, a liquid varnish system with a fraction of volatile components of a maximum of 10 vol.% Is applied to the cork layer and a decorative layer is applied and / or rolled onto the soil.

Before applying the lacquer system to form a primer, the cork layer is heated to a temperature of 40-60 ° C, preferably to about 50 ° C. The decor is printed by means of a printing device, which is guided over the surface and can be made in the form of an impression cylinder.

The known method of applying a decorative layer to a cork surface is lengthy. The decorative layer is applied to the cork surface by means of impression cylinders and to a pre-applied primer layer.

There is a known method of applying UV printing on the surface of flat cork panels (RF patent N ° 2592342 dated 06/03/2015), which includes a preliminary stage of preparing a graphic composition using a processor and appropriate software and a stage of printing a multicolor image on the panels by means of an inkjet printer having printing heads with nozzles emitting microdroplets of the required color onto the surface to be printed, and the processor controls the printer, while printing is carried out by applying a semi-primer layer to the surface of the cork panel, which is formed by applying the first printing layer with a double volume of white ink with a print head extended relative to other print heads, with sequential application of a double volume of color ink to obtain a decorative print layer.

Known methods for applying a decorative image by UV printing are complex, and also involve applying a polymerizable film layer of a coating to the material, which negatively affects the environmental properties of the material. As a result of application, a flat multi-color coating is obtained.

Known decorative board and a method for its manufacture according to the patent EP0294825 from 1987.06.12 publ. 1988.12.14 The decorative board comprises a cork board formed from a chipped cork bound by a binder resin, and a coating layer formed on said cork board formed by applying an opaque coating material containing a resin and a pigment component on a cork board to create a marble pattern in accordance with the difference in absorbent the abilities of the different parts of the specified base.

As the resin, it is preferable to use acrylic or urethane resins.

The disadvantage of the known solution is also the deterioration of the environmental properties of the material.

The object of the present invention is to provide a manual method for applying decorative images, allowing to obtain a multicolor and / or multi-colored decorative textured coating on the surfaces of flat cork panels, as well as flat panels, the front surface of which is made of cork material in large quantities, without resorting to a complex printing method or laborious hand drawing while maintaining the environmental properties of the material to be coated.

Disclosure of invention

The technical result is to simplify the technological process, reduce the cost of the finished product and preserve the environmental properties of the material, as well as ensure the production of various decorative surfaces, including imitation of the natural texture of wood, stone and other natural materials on the finished product.

The technical result is achieved by the fact that the method of obtaining an artistic decorative coating on the surface of flat cork panels, including painting, interoperative drying, while the decorative coating is carried out on the previously cleaned and sanded surface of the cork board, at least one layer of water-soluble tinted or mixed with a filler in the form of a fine cork acrylate-based varnish is applied with a shift applied to wet coating with hand tools to obtain a decorative image.

Brief Description of the Drawings To illustrate the technical solution, the following figures are given:

FIG. 1 - a sample of the product obtained in accordance with the claimed solution, with a pattern imitating the texture of a radial cut of wood; Fig. 2 - a sample of the product obtained in accordance with the claimed solution, with a pattern that imitates the texture of a stone;

Fig. 3 - a sample of the product obtained in accordance with the claimed solution, with a pattern in the form of volumetric strips, separated by grooves.

Embodiments of the invention

Imitation refers to the reproduction of the texture and color of valuable wood or other materials on the surface of less valuable materials. In the claimed invention, imitation is understood as obtaining various kinds of decorative surfaces while maintaining the natural qualities of the cork material.

To create a decorative coating in the claimed invention, a water-soluble, tinted acrylate-based varnish is used. Varnish is a viscous water-soluble liquid. Drying of the varnish is carried out by evaporation of water, after which it forms an elastic coating characterized by high adhesion to the surface and mechanical strength. The composition of the varnish can be diluted with water to ensure the required viscosity. The varnish can be applied both in liquid and in pasty state.

Applying at least one layer of tinted acrylate lacquer to the surface of the cork material will change the natural color and texture of the surface of the cork panel. The decorative effect is created by the characteristics of the tinting layer (color, gloss, texture, etc.).

Liquid or paste-like water-borne acrylate varnish is applied with a roller, brush, spray or spatula.

Approximate consumption of tinted acrylate varnish for the first layer is approximately 100-150 ml / m2.

The application of shear forces to the varnish applied to the surface of the cork material makes it possible to obtain a relief textured surface due to its increased viscosity.

In addition, finely dispersed cork chips can be added to the varnish composition, giving additional volume to the finished coating.

The application of shear forces to the coating is carried out by means of various tools, for example, textured rollers, metal, rubber or plastic scrapers of various widths and blade shapes (smooth or serrated), brushes with natural or artificial bristles, textured spatulas to simulate a wood pattern, combs.

The drying time of the coating directly depends on the temperature and humidity of the surrounding air. At an ambient temperature of + 20 ° C and a humidity of 65%, the drying time is 0.5-3 hours.

Also accelerated drying is possible with a hair dryer or in a specialized oven. The water-borne varnish can be applied directly to the cork material (solid cork panel or top layer of cork veneer) or to a pre-painted surface. Pre-painting is carried out with a water-soluble acrylate-based stain, which allows you to preserve the environmentally friendly properties of the finished cork material.

On top of the applied lacquer layer, a paint layer made with a water-soluble acrylate-based stain can also be applied.

Examples of implementation of the invention: A cork panel containing a layer of compressed cork material and a top layer of natural cork veneer with a thickness of 1 mm was used as the basis for the coating.

To obtain a coating that imitates the natural texture of materials, we used tinted varnish on an acrylate basis, hand tools: a paint roller, brushes made of artificial and natural bristles, combs with wide and narrow teeth, textured spatulas to simulate a wood pattern, rubber or plastic scrapers of various widths and shapes blades (smooth or serrated).

Example 1. Imitation of wood texture (radial cut of wood):

To create a coating, the first layer of coating was applied to the previously cleaned and sanded surface of the cork panel - a water-soluble tinted varnish on an acrylate basis with a density of 1.0-1.1 kg / l of light shades with a paint roller. Then a comb was carried out along the entire length of the board to partially remove the applied coating and dried naturally from 1.5 to 3 hours at an ambient temperature within the range (+ 20 ° C - 25 ° C) and a humidity of no more than 65%. After the first stage of application, a coating was obtained in the form of embossed stripes.

Next, a second layer of coating was applied with a roller - varnish tinted with a brown pigment on an acrylate basis, after which it was carried out with an effort with a comb along the entire length of the board to partially remove and redistribute the second layer and then brushed, imitating thinner wood fibers. The second layer was similarly dried in a natural way from 1.5 to 3 hours at an ambient temperature within the range (+ 20 ° C - 25 ° C) and a humidity of not more than 65%.

A similar reapplication of the above layers is possible to obtain different wood textures.

The pigment for tinting the varnish is selected accordingly to obtain an imitation of a certain type of wood.

A realistic picture is obtained on the surface of the cork material, simulating the texture of wood in a radial cut.

A sample is shown in Fig. 1.

Example 2.

Imitation of stone texture:

To create the cover, we selected a cork panel that already had “flaws”: sinks, recesses.

On the previously cleaned and sanded surface of the cork panel, the first layer of paint coating was applied - a water-soluble tinted varnish on an acrylate basis with a density of 1.0-1.1 kg / l of a dark shade with a paint roller. After applying the coating layer, the board was dried naturally from 1.5 to 3 hours at an ambient temperature within the range (+20 ° C - 25 ° C) and humidity no more than 65%. Next, a second layer of coating was applied with a roller - an acrylate-based varnish tinted with a pigment of light shades, after which the coating was removed with a scraper blade, while the paint of the second layer remained only in the irregularities and cavities inherent in the surface of the natural veneer. The second layer was similarly dried in a natural way from 1.5 to 3 hours at an ambient temperature within the range (+ 20 ° C - 25 ° C) and a humidity of not more than 65%.

Thus, a surface was obtained that imitates the surface of a stone - a monochromatic coating with veins and blotches of a different color (Fig. 2).

Example 3.

A mixture of cork chips and a transparent or colored varnish (binder) was preliminarily prepared. For this, a mixture of cork chips with a particle diameter of up to 0.63 mm and cork dust was used. Depending on the desired decorative pattern and the tool used to create the pattern, the components can be selected in different proportions. It has been experimentally established that it is most advisable to use the following percentage range of the mixture per 100 g of the finished mixture: cork chips are taken 2-8%, varnish 92-98%. The mixture is thoroughly mixed with a mixer or by hand until a homogeneous mass is obtained.

The facing veneer of the cork panel was previously painted with a water-soluble acrylate-based stain with a density of 1.0-1.1 kg / l in a dark shade using a paint roller. After applying the coating layer, the board was dried naturally for 1.5 to 3 hours at an ambient temperature within the range (+20 ° C - 25 ° C) and a humidity of not more than 65%. Then on top of the first layer of coating with a spatula, a mixture of cork chips and varnish was applied in a uniform layer. Then, immediately or after a few minutes, it was carried out with pressure on the applied surface with a metal comb with teeth, the coating was partially removed. As a result, a pattern was obtained in the form of well-visible volumetric stripes separated by grooves (Fig. 3). The second layer was similarly dried until complete curing in a natural way from 1.5 to 3 hours at an ambient temperature within the range (+ 20 ° C - 25 ° C) and a humidity of no more than 65%.

After the volumetric strips have completely solidified and cured, they can be trimmed with a dry spatula to remove excess protrusions, irregularities, or left as they are, and an additional layer of transparent or colored strengthening agent can be applied to obtain a greater decorative effect.

The panel is then dried again until the applied coating has completely solidified. Similarly, other textures can be obtained using various types of tools that provide a shear of the applied coating, for example, a tangential cut of wood. In this case, a textured spatula to simulate a wood pattern and a brush can be used to obtain the desired texture. The decorative image obtained using the method according to the claimed invention simulates with a high degree of accuracy the natural texture and color of wood or stone on a flat surface of the cork material.

Other decorative items for interior decoration, different in appearance, can also be created. The use of high-viscosity varnish as a coloring coating makes it possible to obtain an embossed decorative coating. The addition of a filler in the form of finely dispersed cork chips to the varnish additionally enhances the visually observed volumetric pattern. The method is easy to use. The use of environmentally friendly materials on a water-soluble basis allows you to preserve the natural properties of the cork.

Claims

CLAIM

1. A method of obtaining an artistic decorative coating on the surface of flat cork panels, including painting, interoperative drying, characterized in that the decorative coating is carried out on a previously cleaned and polished surface of a cork board, at least one layer of water-soluble tinted or mixed with a filler is applied in the form of a finely dispersed acrylate-based varnish cork with shearing applied to the wet coating with hand tools to obtain a decorative image.

2. A method of obtaining an artistic decorative coating on the surface of flat cork panels according to claim 1, characterized in that textured rollers, metal, rubber or plastic scrapers of various widths and blade shapes, brushes with natural or artificial bristles, textured spatulas are used as hand tools to simulate a tree pattern, combs.

3. A method of obtaining an artistic decorative coating on the surface of flat cork panels according to claim 1, characterized in that the coating is dried for 1-3 hours at an ambient temperature in the range of 20 ° C -25 ° C and a humidity of not more than 65%.

4. A method of obtaining an artistic decorative coating on the surface of flat cork panels according to claim 1, characterized in that a layer of water-soluble tinted acrylate-based varnish is applied over a layer of water-soluble acrylate-based stain.

5. A method of obtaining an artistic decorative coating on the surface of flat cork panels according to claim 1, characterized in that the coating layer is applied repeatedly.

6. A method of obtaining an artistic decorative coating on the surface of flat cork panels according to claim 5, characterized in that, at least one layer of varnish contains a filler in the form of a finely dispersed cork.

7. A method of obtaining an artistic decorative coating on the surface of flat cork panels according to claim 6, characterized in that it contains a layer of transparent varnish applied over a varnish layer with fine cork crumbs.