DE8802288U1 - Inorganic insulation board - Google Patents

Description

Description

The invention relates to an inorganic insulation board with an insulation layer made of mineral fibers, in particular rock wool, and with at least one one-sided covering layer.

Insulation boards, especially those that are at least temporarily exposed to suspended materials such as cement, mortar, etc., are known in various designs in the state of the art. The problem that arises with such insulation boards is that the insulation board, or more precisely its insulation layer, must have particularly preferred properties, such as dynamic rigidity, low heat and/or sound conductivity, etc., which are, however, endangered by the fact that the penetration of solid particles into the insulation layer causes so-called bridging, which can then lead to a drastic deterioration of the properties mentioned. For this reason, the insulation layer is provided with an impermeable cover layer on its endangered side.

It is known to provide covering layers for such applications made of cements* such as Portland or magnesia cement with appropriate reinforcements or fillers. It is also known to provide aqueous inorganic solutions of water glass or silica sol as the basis of the covering layer mass.

DS-PB 33 40 556 discloses a DKmm system for separating joints between in-situ concrete shells of partition walls, as well as an insulation board made of mineral fibers, coated with a closed-surface layer of inorganic materials, based on water glass. This publication points out that insulation boards are also often used in separating joints in construction, e.g. in separating joints between terraced houses, which is why, with the exception of a small amount of binding agent present in the boards, no organic materials are used in order to meet the requirements for fire protection. When water glass is used as the base of the layer, the resistance to re-dissolution is also sufficient, since when protecting against poured concrete, the latter briefly places a heavy load on the layer, but then sets and no longer places any load on the layer. Penetrating rainwater would flow vertically through the insulation layer in the case of a separating joint without causing any damage.

However, all cover layers known in the state of the art have the disadvantage that they only change into the gel state after the removal of the aqueous phase, i.e. through particularly costly drying, and then form more or less solvatable phases, i.e. are still relatively susceptible to re-dissolution.

This disadvantage of susceptibility to re-dissolution is particularly noticeable in the case of Öäörtßlattert used in joints in accordance with DE-PS 33 40 556. The penetrating rainwater can come into contact with the covering layer and thereby contribute significantly to rotting and thus destruction of the insulation as a whole by partially "dissolving" the layer.

Furthermore, the heat resistance of the insulation material used is relatively low or organic substances are still present, albeit in small quantities, so that an influence on the flammability class of the insulation layer can hardly be avoided. The use of such covering layers on insulation layers that meet the requirements of fire protection panels is therefore not possible.

But also from the point of view that such insulation boards are often processed in areas that are subsequently hardly accessible, the requirement of a particularly high resistance to re-dissolution, which has not yet been satisfactorily met, is particularly important.

The object of the invention is therefore to create an organic insulation board which, in order to avoid the disadvantages mentioned above, does not contain any organic substances, is sufficiently resistant to mechanical stress, is heat-insulating, sound-absorbing, largely resistant to dissolution, can be used on fire protection boards, can be produced cost-effectively and allows any processing.

This object is achieved according to the invention by the features of the main claim.

In the insulation board according to the invention, the necessary strength against mechanical loads in the woSdötlienen is achieved by the fibers of the insulation layer, which are oriented perpendicular to the main plane of the insulation board and which preferably consists of rock wool, but can also consist of glass wool. The covering layer itself also contributes to a certain extent to the strength against

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mechanical stresses. The strength of the inventive insulation board thus guaranteed enables any desired processing«

The area of application of insulation boards coated in this way is determined primarily by the properties of the insulation material, provided that the applied top layer can withstand the associated loads. The top layer must therefore be optimally adapted to the properties of the insulation material. The main purpose of using such insulation boards is to exploit their thermal insulation and sound absorption properties. For the top layer, the resistance to ,; re-dissolution and the high heat resistance are of particular interest, as this can significantly increase the area of application of the insulation board, so that it is also possible to use it in damp areas and in the fire protection sector. By varying the thickness of the insulation layer, the insulation board can be adapted to a wide range of thermal insulation and sound absorption requirements.

These also have rectangular dimensions with standard commercial dimensions. Step folds can be provided on their edges so that when several insulation panels are laid, overlapping zones are created that represent a kind of labyrinth seal against external media. This creates a closed-surface, protective covering layer on one side of the insulation system.

The material used for the top layer, consisting of a suspension of a mineral mixture and silicophosphate, not only strengthens the bond of the already crystalline cross-linked

but also contributes to a particular extent to the bonding of the top layer to the insulation layer, i.e. the surface of the mineral fibre fleece, so that no further measures are necessary to bond the top layer to the insulation layer.

A particular advantage results from the extremely simple and cost-effective production of a covering layer according to the invention on an insulating layer. For this purpose, a silicophosphate solution is used as a liquid inorganic substance, which is thermally crosslinked and thus forms a water-insoluble phase. Solid phases of the variable composition nSiO2.mP205.qH2O are formed from the aqueous solution at just 90 ^° C, which crosslink to form crystalline silicophosphates at higher temperatures.

To produce a top layer, the silicophosphate solution is added to a mineral mixture consisting of pigments, possibly other fillers and a surface-active substance, e.g. a sulfonate, which improves the distribution on the surface of the mineral fiber fleece and the adhesion to the mineral fibers. This suspension is then sprayed onto the thin layer using a conventional dyeing system for dispersions in a particularly cost- and time-saving manner and then cross-linked, i.e. cured, at an elevated temperature, preferably above 180°C. In principle, it is of course also conceivable to provide an insulation layer with a top layer on both sides and/or on its edges if necessary.

As already mentioned, a layer can be incorporated into the insulation board, which, in combination with other boards, forms a kind of labyrinth seal.

The insulation panels can be attached to the respective substrate using any fastening material, but can also be concreted in place.

Further preferred embodiments of the present invention emerge from the subclaims.

The invention is explained further below using an exemplary embodiment with reference to the only drawing, which shows a section of an insulation panel according to the invention in a perspective view.

The figure shows an insulation board, designated 1 overall. It is made up of an insulation layer 2 and a cover layer 3. The insulation layer 2 can consist of rock wool or glass wool.

Two adjacent edges 4 and 6 have a step fold 7, which forms an upper overhanging step 8 in the area shown, which interacts with a lower step of another adjacent insulation board (not shown), thereby forming a type of labyrinth seal. This prevents suspension-like materials from penetrating deep into the insulation board. So-called bridging is therefore reliably prevented.

The top layer 3 is sprayed onto the insulation layer 2 and cross-linked at about 200°C. Due to the mineral mixture, which consists of 2 parts water, 0.8 parts red, inorganic pigment (e.g. Bayferroz, red), 0.02 parts surfactant (e.g. a sulfonate such as Hoechit-Hostapur and possibly 6 parts chalk powder)

There is no need for an additional bonding agent to connect the insulation layer 2 with the covering layer 3. About 20 GT of silicophosphate are then added to the mineral mixture to produce an approx. 30% solution.

This composition, in particular through the use of silicophosphate solution which is thermally cross-linked, has proven to be particularly resistant to redissolution, as has been shown by dissolution tests which, in the case of ground dry substances which have been thermally treated in the same way, have shown silicophosphate to be 30% more resistant to redissolution than sodium water glass.

The features of the invention disclosed in the above description, in the figure and in the claims can be essential for the realization of the invention in its various embodiments, both individually and in any combination.

Insulation board l Insulation layer 2 Top layer 3

Edge 4

Edge 6

Shiplap 7

Claims (9)

RADEX-HERAKLITH Industriebeteiligungs AG, Vienna, Austria Inorganic insulation board Protection claims: 1. An organic insulation board with an insulation layer made of mineral fibers, in particular rock wool, and with at least one cover layer on one side, characterized in that the cover layer (3) consists of crystalline cross-linked silicophosphate plates which are arranged in an irregular position relative to one another, and a mineral mixture with which the cover layer (3) is adhered to the mineral fiber surface of the insulation layer (2) . 2. Insulating board according to claim 1, characterized in that when the insulating layer (2) is formed from rock wool or glass wool, the fibers are oriented essentially perpendicular to the main plane of the insulating board. 3. Insulating panel according to claim 1 and 2, characterized in that the thickness of the insulating layer (2) is adapted to the required thermal insulation and/or sound absorption. 4. Insulating panel according to claims 1 to 3, characterized in that the preferably rectangular dimensions of the insulating panel (1) are adapted to standard commercial dimensions. 5. Insulating panel according to claims 1 to 4, characterized in that the edges (e.g. 4, 6) of the insulating panel (1) have a step fold (7). 6. Insulation board according to claims 1 to 5, characterized in that two adjacent edges (e.g. 4, 6) of an insulation board (1) have a projecting shoulder (8) of the step fold (7) on the side of the insulation board provided with the cover layer (3) and the other adjacent edges have a corresponding shoulder on the uncoated side of the insulation board. 7. Insulating board according to one or more of the preceding claims 1 to 6, characterized in that the cover layer (3) consists of a suspension which contains the mineral mixture and the silicophosphate. 8. Insulating board according to claim 7, characterized in that the mineral mixture consists of a suspension containing pigments, preferably inorganic color pigments, further fillers, preferably chalk powder, and a surface-active substance, preferably a sulfonate. 9. Insulating board according to one of claims 1 to 8, characterized in that the covering layer (3) has a temperature load limit which corresponds to that of fire protection boards ¹ .