DE2161416A1 - Coating compound - Google Patents

Description

"Coating compound "

The invention relates to coating compositions for the surfaces of buildings and other structures, in particular on masses that are mixed with water to the consistency of a paste, whereupon they can be used to cover blankets, Walls and other surfaces of structures are used.

Plastic plastering compounds for building and decorative purposes are known; they usually consist of gelatin and special fillers, usually including gypsum mortar. The plaster is mixed with water and then on applied to the surfaces in question, where it is then a textured or smooth coating. When drying the plaster gives a fairly hard surface, but such surfaces are sensitive to water and when washed off they soften and there is a risk of damage.

It has now been found that coatings with a dry surface can be produced in which the surface is water-resistant.

209825/1051

2 1 6 U 1 6

is constant or washable, if you do this with an inventive Plaster used, in addition to a water-soluble polymeric substance with hydroxyl groups and fillers as much Glyoxal contains that this forms crosslinks with the polymeric substance and the coating becomes water-resistant after drying Surface.

The polymeric material can be a natural product or an artificial product, natural for economic reasons or modified natural polymeric materials are preferred. An example of a suitable polymeric material is Gelatine, as it is already used in the usual plastic plastering compounds. In addition to gelatin, for example starch and cellulose ether are also suitable.

With the polymeric material, the filler and others as the case may be existing components of the dry mass, such as the additives usual for plastic plaster masses, can Glyoxal can be mixed in the dry state, after which the mass is then used in the normal way by mixing it mixed with water and applied with a brush, trowel or spray gun or other suitable means applies the surface in question.

The proportion of glyoxal is not critical, but enough must be used that the applied coating has a sufficiently water-resistant surface after drying; Excess glyoxal does not do any harm, but it does mean unnecessary effort. The preferred amount of glyoxal is 3 to 18%, preferably 5 to 10 % of the weight of the polymeric material.

Dyes, e.g. natural earth colors, fungicides, bactericides and opacifying agents can optionally also be used.

20982 5/1051

21 61 A 16

Three examples of coating compositions according to the invention are given below:

example

White ground casting mortar mica powder asbestos fiber gelatine (technical) Glyoxal

639 parts by weight 187 "105"

53

49 "

4.9

example

White ground mortar mica powder Asbestos fiber strength

Glyoxal

639 parts by weight 187 105

43 4.3

example

Weißgrund Gieönörtel mica powder Asbestos fiber cellulose ether glyoxal

639 parts by weight 187 105

40 "

The content of these approaches of gelatin, starch or cellulose ether can depend on the desired viscosity of the plaster and the degree of crosslinking generated.

PATEI TAKSP HIGH:

20982W1051

Claims (2)

216U16 PATE Ή TANSP RÜ CHE 1) Coating compound for application to the surface of buildings and other components according to. "Mixing with water, containing a finely divided! Filler, a water-soluble polymeric substance with a content of hydroxyl groups such as gelatin, and optionally gypsum mortar, characterized by a content of glyoxal in an amount sufficient to form crosslinks with the polymeric substance and ™ to give the coating a water-resistant surface after drying. 2) coating composition according to claim 1, characterized in that the glyoxal content is 3 to 18, preferably 5 to 10% of the weight of the polymeric substance. 86XXIV 20982 5/1051