SK107496A3 - Coating system for cement-grouted floors - Google Patents

Abstract

A coating system for cement-grouted floors consists of an elastic floating layer that lies on the floor and is made of one or several inorganic binders, an organic cement-compatible polymer and optionally organic or inorganic fillers, and of a covering layer made of one or several inorganic binders and optionally cement-compatible polymers and inorganic aggregates.

Description

Technical field

The present invention relates to a screed system for cement-bonded floors, which overlap defects and lines in the surface and which can be passed mainly by vehicles.

BACKGROUND OF THE INVENTION

In practice, screed systems are known which overlap defects and lines on the surface of concrete masonry or cement-bonded floors, which both prevent the defects from spreading further, and ensure a smooth and jet-free surface, preventing the penetration of dirt, anti-icing salts, solvents and air pollutants. In particular, the surface of such coated surfaces should be mechanically well loaded and, in particular, should allow passage.

In the case of known screed systems, a base of organic binders, possibly of plastic and of cement-compatible additives is usually applied to the concrete substrate, or even unevenness is followed. A layer of plastic is then applied to the base to which a strength-enhancing fabric or web of glass or synthetic fibers can be added as an addition. A covering layer of chemically and mechanically stable material with a high modulus of elasticity, typically 3000 to 10,000 n / mn, is then applied to this plastic layer. This coating generally consists of an organic binder and an inorganic filler which determines the hardness.

Two-component reactive plastics (e.g. EP, EP-PU, PU, PMH, spontaneously vulcanizing rubber and polyester) are preferably used as organic binders. Quartz sand or corundum of suitable grain size is used as the filler for the coating, thereby achieving hardness and non-slipiness of the coating (European Patent Specification No. EP 0475000-A1, British Patent Specification No. GB 045409 A, Swiss Patent Specification No. CH No. 659813 A5 and German Patent Specification No. DE 38 38 320 A1).

Since the plastic layers adhere relatively poorly to the cement-bonded surface, it is proposed to roughen the surface by brushing, sanding or drilling and to apply special adhering bases, which makes the process more expensive. In addition, the coatings themselves are relatively expensive because of their low mechanical strength for the relatively thick layer. The incorporation of increased load capacity is also favorable.

It is therefore an object of the invention to provide a coating system that is valuable, easy to apply and, above all, provides sufficient strength to be passed through. The invention solves this problem.

systems whereby the liner cover must be applied to the fabric or fleece

SUMMARY OF THE INVENTION

According to the invention, the screed system for cement-bonded floors consists of:

(a) an elastic floating layer laid on the floor of at least one inorganic binder and of a cement-compatible polymer and, optionally, of an organic or inorganic filler; b, a covering layer of at least one inorganic binder and optionally of a polymer of cement-compatible polymer and also an inorganic additive .

It has surprisingly been found that a relatively hard layer of predominantly inorganic binder, such as cement and Efa-filler, which contains only a relatively small amount of a cement-compatible organic polymer as an additional binder and possibly an inorganic or organic filler, even at high sufficient strength, does not break or tear, so that such layers cover cracks and do not break when passing.

The layer referred to as a primer or a float generally consists of 5 to 50% by weight of inorganic binder, 5 to 60% of organic polymer and 0 to 80% of filler. For example, cement or Efa-fillers are also used as inorganic binders. A particularly suitable aqueous dispersion of acrylates is used as the organic filler. As filler, sand, small stone particles, slag meal, fly ash and optionally finely powdered organic materials can be used.

The cover layer is essentially of the same products as the base layer, but to increase the strength, the proportion of inorganic binder is increased to 5 to 70% by weight and the proportion of organic polymers correspondingly reduced to 3 to 50%. In addition, it contains 10 to 70% by weight of a hard inorganic powder, such as quartz sand, corundum and teat flour, as a filler. In order to make the surface particularly hard and durable, it is additionally sprinkled with coarse filler material, which in addition to the particular hardness also results in an increased non-slipiness of such floors.

To apply the coating system of the present invention, the surface to be treated is free of impurities such as sand, dust, oil and grease residues and coatings or friable pieces, as well as coatings by rotating steel brushes and the like. The floor is then moistened, avoiding the build-up of foreign particles. In the case of very dry or highly absorbent substrates, priming is possible to prevent moisture from being drawn from the floating layer.

The cement, polymer dispersions and additives are mixed in the necessary proportions and mixed with water until a workable mass is obtained, which is then sprayed onto the floor surface, applied with a spatula or brush. The cement hardens slowly at low temperatures and practically does not harden at 4 ° C, so that at least 8 to 10 ° C, preferably room temperature, must be maintained during processing. In extreme weather conditions (strong drafts, direct sunlight), it may be appropriate to cover the finished layer with a foil until it cures to prevent premature drying or washing with water.

After the floating layer has hardened, the covering layer is applied in the same way and, if necessary, still sprinkled with the corresponding sand or corundum while it is still wet.

The screed systems according to the invention are resilient, so that they can also pass under normal stress. Optionally, the fabric or nonwoven is also inserted into the base layer for reinforcement, whereupon only approximately half the thickness of the respective layer is first applied in the usual manner, the fabric or nonwoven is laid and the rest of the coating mass is applied. As a rule, the composition is prepared so that it is pasty to the point of penetrating the fabric or fleece while achieving a firm adhesion of the entire treatment layer.

they are hard and sufficiently durable and can be after additional can as well

Industrial usability

The screed system for cement-bound floors comprises an elastic floating floor layer laid on the floor of at least one inorganic binder and a polymer compatible with cement and optionally an organic or inorganic filler and a cover layer of at least one inorganic binder and optionally a polymer compatible with cement as also from an inorganic additive.

Claims (7)

PATENT 1. A screed system for cement-bonded floors, comprising: (a) an elastic floating layer laid on the floor of at least one inorganic binder and a cement-compatible polymer and, where appropriate, an organic or inorganic filler; (b) a covering layer of at least one inorganic binder and, where appropriate, of a cement-compatible polymer as well as an inorganic additive A screed system for cement-bonded floors according to claim 1, characterized in that it comprises a floating layer with an embedded fabric or web with an organic or inorganic fiber material. A screed system for cement-bound floors according to claim 1 a 2, characterized in that it comprises an additional base layer between the floor and the floating layer. A screed system for cement-bonded floors according to claim 1 to 3, characterized in that it comprises a covering layer sprinkled with inorganic material. A screed system for cement-bound floors according to claim 1 to 4, characterized in that it contains cement or an Efa-filler as inorganic binder. A screed system for cement-bonded floors according to claim 1 to 5, characterized in that it contains an aqueous acrylate dispersion as polymer. A cementitious screed screed system according to claim 1 to 6, characterized in that the floating layer has a thickness of 1 to 10, preferably 2 to 6 mm and a covering layer of 3 to 20, preferably 5 to 10 mm.