DE102020116883A1 - One-component coating agent for coating substrates - Google Patents

Abstract

One-component coating agent (1) for the anti-slip and/or wear-inhibiting coating of substrates (4) with a liquid binder (2) and hard particles (3), the binder (2) being silane-modified, in particular silane-catalyzed.

Description

The present invention relates to a one-component coating agent for the slip-inhibiting and / or wear-inhibiting coating of substrates with a liquid binder and hard particles. Further objects of the invention form a floor element with such a coating and a method for producing a coated substrate, in particular a coated floor.

Known coating agents for slip-inhibiting and / or wear-inhibiting coating are used for coating substrates in highly frequented areas in which there is usually a risk of slipping. In such coatings, acrylates or two-component polyurethanes are usually used as binders. To coat a substrate, such as a floor element that can be laid or a floor, a layer of the binding agent is first applied to the substrate. Since the binder as such does not have adequate slip-inhibiting and / or wear-inhibiting properties, hard particles are scattered onto the binder layer after the binder has been applied, which give the coating a surface structure. This surface structure and the hardness of the hard particles give the coating anti-slip and / or wear-inhibiting properties.

The labor-intensive scattering of the hard particles results in a very uneven appearance and a coating with a very coarse and rough surface and rough feel. As a result, the correspondingly coated substrates are very susceptible to dirt and difficult to clean. In addition, the merely scattered hard particles are not bound very firmly into the binder layer, which hardens slowly or, as in the case of acrylates, non-hardening, so that the hard particles can detach from it after prolonged exposure. Likewise, the entire coating agent can become detached from the substrate in the event of prolonged and high-frequency stress, so that regular renewal of the entire coating is necessary.

Especially in hygienically sensitive areas, such as hospital corridors or floors of food processing production facilities, where a long shelf life and good cleaning properties are important due to the high stress on the floors, especially with the aggressive chemical cleaning agents typically used there, the known coatings have proven to be appropriate proved disadvantageous.

The object of the present invention is therefore to provide a coating agent for coating substrates which is easy to process and which leads to an abrasion-resistant, permanent coating, as well as a floor element with such a coating and a method for producing a correspondingly coated substrate.

In the case of a one-component coating agent of the type mentioned at the outset, this object is achieved in that the binder is silane-modified, in particular silane-catalyzed.

The curing behavior of the coating agent is improved by the silane modification of the binder. The silane modification causes faster and stronger curing, i.e. H. a faster chemical irreversible crosslinking reaction in which the liquid binder changes to a solid end state. The silane modification provides a highly adhesive coating agent which can form a firm bond with absorbent and non-absorbent substrates. The silane-modified binding agent as a matrix of the coating agent can also ensure that the hard particles are securely bound after curing. A coating agent is achieved which is abrasion-resistant in the cured state. Hard particles do not loosen from the hardened coating material, even with prolonged and high-frequency exposure. The hardened coating agent itself does not come off the substrate. In this way, the coating agent leads to a permanent coating. The silane-modified binder can preferably be designed as a silane-catalyzed binder, which is silane-modified in such a way that the silane modifications serve as a catalyst.

As a one-component coating agent, the hard particles are already mixed with the binding agent. The hard particles therefore do not have to be applied separately to the binder as a further component when coating a substrate. The one-component coating agent can in this way simply be applied to the substrate in the manner of a paint, for example by means of paint rollers, brushes, spatulas, spraying methods or pouring over. The one-component coating agent can therefore be processed in a particularly simple and rapid manner.

In addition to substrates used as floor coverings, the coating agent can also be applied to other substrates, for example to surfaces of walls, wall elements, doors and / or sanitary facilities, such as urinals. It can be, in particular, smooth, metal substrates, such as, for example Steel surfaces. The coating agent can make the substrates easy to clean and thus protect them from contamination that contributes to wear, such as corrosive fingerprints, for example. In addition, the coating agent can have a wear-inhibiting effect due to its corrosion-inhibiting properties.

The binder is advantageously a silane-modified, in particular a one-component, polyether. With a silane-modified polyether, a hard, but still flexible coating can be achieved after curing. A silane-modified polyether as a binder can lead to a chemical-resistant coating after curing. The resistance of the coating that can be achieved by means of the silane-modified polyether, in particular with regard to the resistance to active chemicals, such as, for example, aggressive chemical cleaning agents, can be improved. The shelf life of the coating agent can be improved by using a one-component, silane-modified polyether. In contrast to multi-component polyethers, in which a chemical reaction begins after the individual components have been mixed, which limits the processing time of the binding agent and thus the coating agent and prevents storage after mixing, with a one-component polyether there is no reaction between several components so that both the processing time and the storage time can be increased accordingly.

It is also advantageous if the polyether is an amino-silane-modified, in particular amino-silane-catalyzed, polyether for crosslinking the coating agent with the substrate. Aminosilane-modified polyethers have the surprising effect that an amino-functional silane can achieve excellent adhesion properties on different substrates. In particular on smooth substrates, a considerable increase in the adhesion properties compared to non-aminosilane-modified polyethers can be achieved, which leads to further resistance of the coating. In particular, residual nitrogen groups of the amino-silane-catalyzed polyether can, as catalysts, contribute to better curing of the coating agent when the binding agent reacts with atmospheric moisture.

Furthermore, the coating agent can be enriched with silver ions and / or one or more biocides. The coating agent can be provided with antimicrobial properties, in particular permanently, by means of silver ions and / or the biocide. Several biocides diversify the antimicrobial properties of the coating agent so that an effect against different microbes can be achieved. The silver ions and / or the biocide can be dissolved in the binder. The hard particles can be free of silver ions and / or biocides, i. H. not be enriched with these, but rather have them on their surface through wetting with the binding agent. After the coating agent has hardened, the coating, in particular on its surface, can also have antimicrobial properties.

A preferred embodiment of the coating agent provides that it is solvent-free. In contrast to known coating agents, in which solvents or isocyanates are added, the solvent-free binder can prevent health and environmental hazards, especially when processing the coating agent and when using and cleaning appropriately coated substrates. Especially in hygienically sensitive areas, such as hospital corridors or floors of food processing production facilities, where a long shelf life with good cleaning properties and avoidance of health and environmental hazards is important due to the high stress on the substrates, these can be achieved with the coating agent according to the invention. The coating agent can additionally or alternatively be free of adhesion promoters. In particular, it is possible to dispense with the addition of solvents, which additionally have adhesion-promoting properties, and / or adhesion promoters, such as GLYMO, in a manner that is gentle on the material, health and / or the environment.

A preferred embodiment provides that the hard particles are made of glass, corundum, silicon carbide, silicon nitride and / or polymethyl methane acrylate. Due to the hardness of these hard particles made of glass, corundum, silicon carbide, silicon nitride and / or polymethyl methane acrylate, a substrate can be protected from wear and tear in a simple manner by the coating agent. The hard particles also have a hardness which makes them and thus also the coating material abrasion-resistant, ie abrasion from the surface of the individual hard particles is largely avoided. Optical signs of wear and tear of the cured coating agent can be avoided. In particular, by using hard corundum particles, a matt surface can be achieved even after the coating agent has hardened, which does not require any post-processing to achieve a non-glossy surface. A running-in of the cured coating agent in order to achieve a uniform Achieving surface wear impression can be avoided.

It is further advantageous if the hard particles are microparticles, preferably with particle sizes in the range from 5 μm to 60 μm, particularly preferably in the range from 20 μm to 30 μm. The individual microparticles can have an irregular shape, and the particle size of each microparticle can correspond to the mean radius of the microparticle. Thus, the microparticles can be essentially ellipsoidal or spherical. By using microparticles as hard particles, an optically homogeneous impression of the coating agent can be achieved, in particular in the cured state. Furthermore, in the cured state of the coating, a largely constant feel can be achieved. By using the microparticles, a surface of the cured coating agent can be achieved which is characterized by a low roughness with simultaneous slip-inhibiting and / or wear-inhibiting properties. Due to the low roughness, impurities can settle more poorly and the cleanability can be improved.

Another embodiment provides that the hard particles are silane-modified hard particles, in particular silane-modified corundum particles. The silane modification of the hard particles makes it possible to avoid agglomeration of the hard particles and in particular a settling of the hard particles on the bottom of a coating agent layer applied to a substrate. The silane-modified hard particles can float in the coating agent during the crosslinking of the silane-modified binder. In this way, the silane-modified hard particles can be distributed evenly on the surface of the coating agent applied to the substrate and form an extremely wear-resistant layer there. A self-organizing arrangement of the silane-modified hard particles on the surface of the coating agent applied to the substrate can be achieved in this way. As a result of this self-organization of the silane-modified hard particles on the surface, a large-area and uniform coverage of the surface with the hard particles can be achieved. Uneven agglomeration of the hard particles, as is the case when the hard particles are sprinkled on with known coating agents, can be avoided. Exposure of the hardened binder can be avoided. The use of silane-modified corundum particles has proven to be particularly advantageous. With silane-modified corundum particles, anti-slip properties can be achieved in damp rooms, even if the surface is inclined at angles of inclination in the range of 19 ° to 27 ° (slip resistance value R 11 according to DIN 51130).

In the case of a floor element of the type mentioned at the outset, in order to achieve the above object, it is proposed that it have a coating of the coating agent described above, which results in the advantages described in connection with the coating agent.

In this context it is particularly advantageous if the coating of silane-modified binders and hard particles has a total layer thickness in the range from 50 μm to 60 μm. A total layer thickness of 50 µm to 60 µm of the cured coating agent has a slip-resistant and / or wear-inhibiting effect in a material-saving manner. A correspondingly thin coating with a total layer thickness in the range from 50 µm to 60 µm can also be sufficiently flexible so as not to have a diminishing effect on the mechanical flexibility of the floor element. In this way, a coated floor element can still be flexible when it is being laid.

In a method of the type mentioned at the outset, in order to achieve the above-mentioned object, it is proposed that a liquid coating agent of the type described above is applied to the substrate.

The features described in connection with the one-component coating agent according to the invention can also be used individually or in combination in the process. The same advantages result which have already been described.

Preferably, no additives, such as a primer to be applied to the substrate, additional curing agents or sealants are used to coat the substrate. The liquid coating agent can be applied directly to the, in particular previously cleaned, substrate in the manner of a paint. Mixing or adding additives immediately before and / or after the application of the coating agent can be dispensed with. The coating agent can harden on the substrate in the manner described above and thus coat the substrate in a slip-resistant and / or wear-resistant manner.

It is also advantageous if amino-functional groups of the coating agent hydrolyze to adhere to the substrate by chemical bonding to OH groups on the surface of the substrate. By hydrolyzing the amino-functional groups of the coating agent, a chemical bond is created between the coating agent and the substrate during curing, so that the coating Adheres to the substrate with stable removal. By hydrolyzing the amino-functional groups, reliable adhesion to substrates of various compositions, for example vinyl, linoleum, rubber, rubber, wood or concrete, can be achieved. The method according to the invention and the one-component coating agent can in this way be used for coating various different substrates.

• 1 ein Bodenelement mit einer Beschichtung aus dem erfindungsgemäßen einkomponentigen Beschichtungsmittel.

In the following, details and advantages of a one-component coating agent according to the invention, a floor element according to the invention and a method according to the invention will be explained using the exemplary embodiment of the invention shown schematically in the single figure. It shows:

• 1 a floor element with a coating of the one-component coating agent according to the invention.

the 1 shows a one-component coating agent according to the invention 1 , which is used for anti-slip and / or wear-resistant coating on a floor element 4th is applied as a substrate.

With the floor element 4th it can be an element for laying the floor of a room, such as a tile, a wooden plank, a linoleum board or a vinyl sheet. The coating agent can likewise 1 can also be applied directly to the floor of a room or another substrate in order to coat it directly.

The coating agent 1 is applied directly to the floor element in the manner of a color, in particular without any further additives 4th applied to cure on this. In this way, the in 1 Structure of the coated floor element shown 10 from coating agents 1 and floor element 4th .

The coating agent 1 has a binding agent that is liquid before it hardens 2 as well as hard particles 3 on. The hard particles 3 are to provide a one-component coating agent 1 even before the coating agent is applied 1 in the binder 2 solved. During the crosslinking, the hard particles, in particular the silane-modified, float 3 in the likewise silane-modified binder 2 on, so that all originally with the still liquid binder 2 mixed hard particles 3 self-organizing the surface of the coating after curing of the coating agent 1 form.

As in 1 can be seen, show the hard particles 3 different shapes, but are essentially spherical and ellipsoidal. The hard particles 3 are designed as microparticles with a particle size in the range from 5 µm to 60 µm. The self-organizing hard particles 3 in this way form a surface of the coating from the coating agent 1 , which is characterized by a low roughness and accordingly a low susceptibility to dirt. In addition, the resulting structure of the surface of the coating, together with the hardness of the individual hard particles 3 , a particularly slip-resistant and wear-resistant surface of the coating.

After the coating agent has hardened 1 is the floor element 4th with a coating of the coating agent 1 provided, which has a total layer thickness G in the range from 50 µm to 60 µm. In relation to the thickness of the uncoated floor element 4th this total layer thickness is so small that it essentially does not have a negative effect on the mechanical flexibility of the floor element 4th affects. Thus, the coated floor element 10 essentially the same mechanical flexibility as the uncoated floor element 4th before coating with the coating agent 1 on. Despite the comparatively small total layer thickness G exhibits the coating from the coating agent 1 sufficient hardness and connection with the floor element 4th as a substrate that the coating can be used even if the coated floor element is subject to major complaints 10 has a long shelf life and thus has a non-slip and wear-resistant effect over a long period of use.

With the aid of the one-component coating agent described above 1 , the coated floor element 10 and the process for producing a coated substrate 4th a coating agent for coating substrates, which is easy to process and which leads to an abrasion-resistant, permanent coating, as well as a floor element with such a coating and a method for producing a correspondingly coated substrate is specified.

List of reference symbols

1

Coating agents

2

binder

3

Hard particles

4th

Floor element

10

coated floor element

G

Total layer thickness

Claims (10)

One-component coating agent for the slip-resistant and / or wear-resistant coating of substrates (4) with a liquid binder (2) and hard particles (3), characterized in that the binder (2) is silane-modified, in particular silane-catalyzed. One-component coating agent according to Claims 1 , characterized in that the binder (2) is a silane-modified, in particular a one-component, polyether (2). One-component coating agent according to Claim 2 , characterized in that the polyether (2) is an amino-silane-modified, in particular amino-silane-catalyzed, polyether (2) for crosslinking the coating agent (1) with a substrate (4). One-component coating agent according to one of the preceding claims, characterized in that it is solvent-free. One-component coating agent according to one of the preceding claims, characterized in that the hard particles (3) are made of glass, corundum, silicon carbide, silicon nitride and / or polymethyl methane acrylate. One-component coating agent according to one of the preceding claims, characterized in that the hard particles (3) are microparticles, preferably with particle sizes in the range from 5 µm to 60 µm, particularly preferably in the range from 20 µm to 30 µm. One-component coating agent according to one of the preceding claims, characterized in that the hard particles (3) are silane-modified hard particles (3), in particular silane-modified corundum particles. Floor element with a coating of a coating agent (1) according to one of the Claims 1 until 7th . Method for producing a coated substrate (4), in particular a coated floor, characterized in that a liquid coating agent (1) according to one of the Claims 1 until 7th is applied to the substrate (4). Procedure according to Claim 9 , characterized in that amino-functional groups of the coating agent (1) hydrolyze to adhere to the substrate (4) by chemical bonding to OH groups on the surface of the substrate (4).

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