EP0719365B1 - Process for gluing cut sections of mineral wool panel - Google Patents

Abstract

The process for gluing cut sections of mineral wool panel, especially lamellar mineral wool panel, on a backing using an adhesive mortar, involves first precoating the entire surface of the cut sections with a thin layer of adhesive mortar or aqueous plastic dispersion and, after setting, either applying adhesive mortar in beads or toric form and gluing to the backing or pressing the cut sections into an adhesive layer that was machine-sprayed onto the backing beforehand either in beads and/or in toric form or over the full surface.

Description

The present invention relates to a method for gluing the cut surfaces of mineral wool panels, in particular mineral wool lamella panels to a substrate with an adhesive mortar, and to pretreated mineral wool panels suitable for carrying out the method.

DE-A-40 32 769 describes a thermal insulation system, preferably mineral fiber insulation material with panels of fiber-reinforced insulation material, in which the majority of the reinforcement fibers run essentially parallel to one another. Relatively expensive e.g. Two-component PUR adhesive or bitumen emulsion adhesive used. Another disadvantage here is the full-surface gluing, which means increased expenditure of material and time.

DE-A-41 10 454 describes a thermal insulation system in which the mineral fiber insulation material is wetted on one side with a hydrophilizing solution so that it is permeable to air. In particular, alkali water glass is used as the hydrophilizing solution with and without fillers. Hydrophilization can lead to water accumulation, which worsens thermal insulation. If the side edge is hydrophilized and glued, undesirable thermal bridges can occur.

DE-A-34 44 815 describes a building wall and ceiling structure which is intended for external facades and whose work effort for its manufacture on the construction site and its material expenditure should be less. This is achieved in that the superstructures are delivered to the construction site as prefabricated parts that only need to be processed by painters.

Mineral wool panels, in particular mineral wool laminate panels, have cut surfaces in which the fibers are predominantly arranged perpendicular to the surface. This arrangement of the fibers to the surface results in constant abrasion of the finest fiber fragments during transport and processing on the construction site, which prevent a good bond between the adhesive and the surface.

While mineral wool panels with lying fibers or polystyrene panels are usually mechanically punctured and / or bulged with adhesive mortar and then glued to the substrate, it has so far been necessary to process the mineral wool laminate panels as follows:

In the first step, the adhesive mortar is applied to the cut surface of the lamellar plate either by hand or by machine at the construction site. In a second step, the mortar must then be worked into the surface of the plate using a notched trowel. In a third stage, the panels pretreated in this way are then applied to the wall with a joint offset. In the fourth and final stage, the finishing coat is applied after the reinforcement has been carried out.

In particular, work steps 1 and 2 are very time-consuming and can only be carried out very poorly on the scaffolding. When working in and removing the adhesive mortar, it always falls excess mortar, which should be collected in a container if possible. This is so cumbersome, especially on scaffolding, that this coating is preferably carried out at ground level. However, this means that the freshly coated slab must be transported onto the scaffold by hand, keeping it as horizontal as possible so that the mortar does not fall down again.

The invention has set itself the task of simplifying and improving the method for gluing the cut surfaces of mineral wool panels, in particular mineral wool lamella panels on a substrate with an adhesive mortar, where possible the manual or mechanical point and / or bead-shaped usual from other panels Application of the adhesive mortar should be used.

This task can be surprisingly easily achieved by first precoating the entire surface of the cut surface with a thin layer of adhesive mortar or aqueous plastic dispersion and, after setting, applied either adhesive and / or beaded adhesive mortar and glued to the substrate or pressed into an adhesive layer that was previously sprayed onto the surface by machine in a dot and / or bead shape or over the entire surface.

The precoating can already be carried out at the factory, so that the precoated mineral wool panels are already available at the construction site, which are then either punctiformly and / or beadedly applied with adhesive mortar in the known manner and glued to the substrate or pressed into an adhesive layer. that was previously sprayed onto the surface by machine in the form of a dot or a bead or over the entire surface.

Since usually only an approx. 50% coating is sufficient for the usual point and / or bead application of adhesive mortar, the mortar consumption is greatly reduced in the method according to the invention. The consumption for the previous thin layer with adhesive mortar or aqueous plastic dispersion is significantly less than the amount of mortar required for the full-surface gluing in the method previously used.

Furthermore, there is no need to collect, recycle or dispose of excess mortar that has been removed, so that this leads to further material savings.

In particular, if the thin layer of adhesive mortar or aqueous plastic dispersion is applied at the factory, this can be done very efficiently by machine, so that further wage and labor costs can be saved.

In the further embodiment of the method according to the invention, the pre-coated mineral wool lamella plates are glued to the substrate in that the substrate is mechanically coated in a punctiform and / or bead-like manner or over the entire surface with adhesive mortar. This mechanical application of the adhesive mortar is preferably carried out by means of conventional spray guns in connection with continuous mixers or plastering machines which work according to the mixing and conveying principle. The pre-coated mineral wool lamellar panels are pressed into the adhesive mortar layer applied over part or all of the surface.

The bonding of the mineral wool laminate panels carried out in this way can be carried out by two people in a time-saving manner. A first person sprays the adhesive mortar in a punctiform and / or bulge or area, while the second person presses the pre-coated plates into this adhesive mortar layer. This creates a permanent, full-surface connection between the plate and the substrate.

This method has the advantage that larger, coherent areas can be machine-applied with adhesive mortar, which represents a considerable time saving compared to the adhesive method, in which the plates have to be individually coated and glued. At the same time, this process guarantees partial or full surface bonding of the lamella plates.

The method according to the invention makes it possible to compensate for unevenness of the substrate more easily and better than in the case of full-area gluing so far, especially since mortar is pressed out laterally when pressed and thus gets into the plane joint plane. There this mortar is noticeable as a thermal bridge.

In particular when the cut surfaces are pretreated at the factory with the thin layer of adhesive mortar or aqueous plastic dispersion, other qualities of adhesive mortar can also be used than the relatively expensive special mixtures used hitherto. In particular, low-viscosity, well-wetting and quick-setting mortar mixtures can be used. This simplifies and accelerates the application and setting of the thin layer of mortar, so that intermediate storage times before setting can be shortened or avoided entirely. Aqueous plastic dispersions, such as polyvinyl acetate, can also be used. Commercially available dispersions for primers are particularly suitable as primers inside and outside, in particular all alkali-resistant organic adhesives and adhesive emulsions.

In a preferred embodiment of the method according to the invention, the cut surfaces are blown dust-free before the thin layer of adhesive mortar or aqueous plastic dispersion is applied, since this improves wetting and Adhesion of the adhesive mortar on the mineral surface leads. This is also easy to carry out in the factory, while such additional measures are more difficult to carry out on the construction site, in particular if workplace hygiene aspects are taken into account.

In principle, the method according to the invention can be used with all mineral wool panels, in particular mineral wool lamella panels which, due to the manufacture, have a perpendicular arrangement of the fibers to the surface and whose surfaces are not bonded well with adhesive mortar due to the hydrophobization of the mineral wool and the dust residues on the surface. Of course, the method can also be used for other surfaces that result from cutting fibrous material and therefore present similar difficulties when gluing as the mineral wool laminated panels.

In particular when the cut surfaces are pretreated at the factory with the thin layer of adhesive mortar or aqueous plastic dispersion, it is possible and entirely sensible to coat both sides of the mineral wool panels. This has the advantage that it is not necessary to ensure that the correct side is glued on the construction site. Furthermore, material pretreated on both sides can easily be glued on the outside with additional material.

Since the pre-coated mineral wool panels can be prefabricated, transported and traded in larger quantities, these mineral wool panels, the cut surfaces of which are precoated with a thin set layer of adhesive mortar or aqueous plastic dispersion, are the subject of the invention.

The process according to the invention and the precoated mineral wool sheets obtained as an intermediate product are explained in more detail in the example below.

example

A lamellar plate RP-PL, WD according to DIN 18165, Al according to DIN 4102 T.1 and WLG 0.45 according to DIN 4108 was used. The tear resistance> 100 kN / m ² was measured according to DIN 18165. The dimensions of the plate were 1200 x 200 mm. The plate thickness was 100 mm. Other commercial thicknesses of 20 to 240 mm were also used. At least one of the cut surfaces with fibers oriented perpendicular to the surface was coated with a 2 to 4 mm thick layer of a commercially available adhesive mortar (MF 700 from the applicant). After this thin layer had set, this area was spotted and / or beaded with additional adhesive mortar (MF 700) and then glued to the substrate. The adhesive strength of these boards to the substrate was better and more uniform than with a conventionally bonded mineral wool lamella board, to which adhesive mortar was first applied in the usual manner and then the mortar was worked into the surface structure by hand using a notched trowel. Various other qualities can also be used as adhesive mortar. The adhesive mortar MF 700 also fulfills the requirements of fire protection.

Similar good results were achieved when using aqueous plastic dispersion based on polyvinyl acetate (neturasit® isoliergrund, sold by the applicant).

The adhesive properties were further improved after the cut surface had been blown dust-free with compressed air before the thin layer of mortar was applied.

Depending on the type of adhesive used, there is a dry or temporary storage period before the adhesive sets. After the coating has hardened, the lamella plate is stored ready for dispatch.

The processes described above can also be carried out on an assembly line.

Claims (3)

1. A method for the bonding of cut surfaces of mineral wool sheets, especially mineral wool lamellar sheets, to a substrate by means of an adhesive mortar, characterized in that said cut surfaces are first precoated with a thin layer of adhesive mortar or aqueous plastic dispersion on the whole surface thereof, and either, after curing, are provided with adhesive mortar applied at points and/or in lines and bonded to the substrate, or, after curing, are pressed into an adhesive layer which was preliminarily machine-sprayed onto the substrate at points and/or in lines or on the whole surface thereof.
2. The method according to claim 1, characterized in that said cut surfaces are freed from dust by blowing prior to the application of said thin layer of adhesive mortar.
3. Mineral wool sheets, especially mineral wool lamellar sheets, characterized in that the cut surfaces thereof are precoated with a thin cured layer of adhesive mortar or aqueous plastic dispersion.