DD213663A1 - FLOOR LEVELING - Google Patents

Abstract

Floor leveling compound for application on solid soils mainly of cement or anhydrite screed as follow-up or renovation work with the aim of minimizing damage in the leveling layer and increasing the adhesion to gypsum. The object, in addition to the improvement of the strengths to improve the swelling and shrinkage, is achieved according to the invention that the starting material from 50 to 99.8 parts of anhydrite and exciter salts, zero to 50 parts Feinstzuschlagstoffen, 0.1 to 1 parts plasticizer and 0, 1 to 1 parts of a primer.

Description

VEB Leuna-Werke

 !! Walter UlbrichtH

LP 8280

Title of the invention Floor leveling compound Field of application of the invention

The floor leveling compound is applied on solid floors, which are mainly made of cement or anhydrite screed. In this case, mostly flow screed is used in the sense of a rational construction method. Practice now shows that balancing weights are required for the conventional, hand-smoked screed, as well as for the flowing screed in certain paellen. For example. by follow-on work in rooms with, freshly laid screed by ignoring the Aushaertzeiten the surfaces damaged.

The renovation of worn screeds as well as all floor floors requires compensation before hatching.

Characteristic of the known technical solutions Balancing masses are traditionally and generally known

made on the basis of plaster. These balancing weights have the apparent advantage of hardening after a short time. Thus, the floor covering laying trades are capable of repairing damage in the short term and of starting the laying of the covering after a reasonable waiting time. After an initial, seemingly good appearance, however, many Paellen suffer damage. The leveling layers are broken down into small pieces under the covering and finally ground to dust by further stress. So in the end the covering must be removed and the damaged area repaired again. This renovation work is very expensive. ,

Gypsum leveling compounds have at least the following basic disadvantages: they do not achieve the required final strengths in order to be able to withstand the expected loads in thin layers. Furthermore, gypsum compounds are sensitive to subsequent moisture caused by water-soluble adhesives. And finally, gypsum masses, at the moment of solidification, increase their volume up to 1.5 % (linear 0.5 %). This volume increase has expired after 1 hour and leads to an initially not noticeable separation of solid floor and leveling compound.

This disadvantage in the adhesion should be compensated by the addition of hydrated lime for balancing and leveling compounds based on gypsum (DE-OS 2,437,544). The disadvantage is 'that, despite improved adhesion to the base, there is the damage mentioned in the compensatory layer'

It is now known to apply a flowable binder composition of preferably anhydrite with a water / binder ratio of 0.38 to 0.75 on a water-absorbing layer with semi-permeable separating layer (DE-OS 2 319 069; DD-AP 112 490; OE-PS 336 856). This' binder mass does not contain a plasticizer and is probably much stronger than a leveling coat. Also

- 3 - the water-absorbing layer is not a screed.

Furthermore, it is known to lay a dry screed of prefabricated panels offset in two layers and compensate the Pugen with a composite mass, at the same time a thin layer covers the · upper'Plattenlage (DE-OS 2,550,252). The disadvantage here is that in the balancing mass additionally .zugfestigkeitssteiger substances in the form of glass fibers must be introduced and prefabricated plates form the basis. ~.

Object of the invention

The aim of the invention is to avoid damage in the leveling layers by stress on the floor, although the layers are applied very thinly, and to considerably increase the adhesion of the leveling compound to the substrate.

Explanation of the essence of the invention

The object was to ~ improve the adhesive, bending and compressive strengths of the leveling compound and to make the swelling and shrinkage behavior at low-boiling consistency and good processability favorable.

It has surprisingly been found that compared to gypsum a finely ground natural anhydrite stone, the exciter salts, a plasticizer, adhesion promoters and Feinstzuschlagstoffe are mixed as Bodenausgleichsmasse to solve the problem is best suited. According to the invention, the leveling compound consists of 50 to 99.8 parts of natural anhydrite and exciter salts, zero to 50 parts of ultrafine aggregates of zero to 1 mm, 0.1 to 1 part of a plasticizer and 0.1 to 1 parts of a PVAc-based adhesion promoter,

Preferably, a solid is used as plasticizer.

Zv, eckmaessigerweise the Feinstzuschlagstoffe consist of quartz sand, wood flour, brick dust, glass powder or mixtures

 - 4 -

the same. It is advantageous to continuously reduce the proportions of ultrafine aggregates under higher stress. This results in no disadvantages in the swelling and shrinkage behavior.

Preferably, the floor leveling compound is ready premixed, so that only a water addition is required on the site.

It is advantageous that the water / binder factor for the inventive floor leveling compound is preferably 0.30.

Exemplary embodiment Example 1

99 parts by weight of finely ground anhydrite, containing 1.5 parts by weight of sulfidic initiator salts and 0.3 parts by weight of a solid plasticizer with 1 part of a commercial PVAc latex emulsion and 28 parts of water to duennfluessiger consistency by 2 -minutiges ,. brought vigorous stirring. The thus prepared balancing mass was on a defective

  2

Anhydrite screed pours, whereby surfaces are treated up to 1 m. Due to the good absorbency, the mass already started after 5 min. Existing transitions were post-glazed with a spatula. After 4 hours, the leveling compound was sufficiently hardened to be handled with care: the surface was completely free of cracks, bumps and distortions at the transitions.To test the adhesion, screed plates of dimension 100-100 χ 20 were applied by means of a template Agelglelchsmasseschichten 25 mm in diameter with 5 mm strength applied.With a suitable adhesive, a PUR-2-component system was used, were glued to steel Stempei, which in turn mechanically

were connected to the tester for tensile strength. The adhesive strength in 80% of the samples was over 8 kp / cm, there was a breaking out of the screed from the plate; i.e. the compound leveling compound - screed persisted in these cases.

Characteristics of the balancing mass:

Compressive strength = 42.8 MPa (28 d) Bending tensile strength = 8.6 MPa 1! Adhesive strength = 0.8 MPa H

In comparison, a commercial gypsum balance on anhydrite screed yielded the following characteristics:

Compressive strength = 25,7 MPa (28 d) Flexural strength = 5,6 MPa II Adhesive strength = 0,15 MPa H

Example 2 '

99 parts by weight of finely ground anhydrite, containing 1.5 parts by weight of sulfatic excitation salts and 0.3 parts by weight of a solid plasticizer were mixed with 1 part of a commercially available PVAc - latex emulsion, 100 parts by weight of fine quartz sand 0 to 0, 5 mm and 35 parts of water to a dessous consistency brought by two-minute, vigorous stirring. The processing and production of the Pruefkoerpers was carried out as in Example 1. The prepared according to Example 2 leveling compound is mainly due to the material obtained by the leaning material savings for repair surfaces greater than 1 m or use for potting smooth Zimmerflaechen.

Characteristics of the balancing mass

Compressive strength 30 2 MPa (28 d) flexural strength = 6 3 MPa U adhesiveness O, 65 MPa Ji

The moderate leveling compound was with a screed fracture fraction of 30 % in the adhesive strengths under the values measured in Example 1; However, compared to conventional plaster balancing masses, a 4 times higher adhesive strength was measured here as well. '

Claims (5)

invention claim Floor leveling compound for application to solid floors predominantly made of cement or anhydrite screed, characterized in that it consists of a finely ground natural anhydrite stone, stimulating salts, a plasticizer, coupling agents and superfine aggregates, with 50 to 99.8 parts of natural anhydrite and exciter salts Hull to 50 parts ultrafine aggregates zero to 1 mm, 0.1 to 1 parts of a preferably solid plasticizer and 0.1 to 1 parts of a coupling agent based on PVAc are ground. 2. Floor leveling compound according to item 1, characterized in that the Feinstzuschlagstoffe quartz sand, wood flour, clay, glass powder or mixtures thereof are the same. 3 .. floor leveling compound according to item 1 and 2, characterized in that the proportions of Feinstzuschlagstoffe are reduced in terms of recipe constantly at higher stress. 4. Floor leveling compound according to item 1 and 3, characterized 'characterized in that it is present as ready pre-mixed leveling compound. 5. floor leveling compound according to item 1 to 4, characterized in that a water / binder factor of 0.30 is maintained.