FI65734C - FOERFARANDE FOER FRAMSTAELLNING AV EN MED METALLFILM BELAGD MIERALFIBERPLATTA - Google Patents

Description

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Federal Republic of Germany-Forbundsrepubliken Tyskland (DE) P 2603905.4 (71) Saint-Gobain Industries, 62, Bd Victor Hugo, 92209 Neuiliy sur Seine, France-France (FR) (72) Bernd Steinkopf, Ludwigshafen-am-Rhein, Erich Michael Krzyzanowski, Frankenthal / Pfalz, Peter Hackenberg, Ludwigshafen-am-Rhein,

Federal Republic of Germany FSrbundsrepubliken Tyskland (DE) (74) Berggren Oy Ab (54) Method for the production of coated metal fiber board - Förfarande för f ramstäl In ing av en med metal Mm belagd minera1 f iberplatta

Finnish patent No. 60 667 proposes the production of a mineral fiber board coated with a metal film, mainly an aluminum film, for example as an insulating board, which makes it possible to satisfy the following requirements:

The tile must not be burning, ie. in terms of non-combustibility, it must be at least of the same quality as ordinary tiles coated with an organic adhesive.

In addition, the adhesive used to bond the mineral fiber board and the metal foil must not affect the fibers and / or their bonding.

The adhesive must also not have any detrimental effect on the metal film used for the coating, in particular on the aluminum foil, i.e. it must not cause substantial corrosion or slight local embrittlement and must not have any other detrimental effect.

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Finally, the adhesive used must be easy to apply.

Meeting these notified requirements poses certain difficulties, as it should be noted that meeting one requirement does not remove the conditions for meeting another.

Finnish Patent No. 60,667 thus relates to a mineral fiber tile coated with a metal foil, in particular an aluminum foil, in the manufacture of which a water glass-based glue with mineral minerals has been used as an adhesive for bonding the tile to the metal foil and having the following composition: 60-95% water glass, 4-16% , 1 to 5% of oxides or carbonates of alkaline earth metals or zinc, oxides or hydroxides of aluminum and / or barium sulphate, 0 to 5% of pigments, in the form of a water dilution adapted to the application technique, the substances to be added to the water glass being used as finely as possible.

Suitable mineral minerals are kaolin, clay, talc or similar mixtures of these additives.

If pigments are used, they are mainly Fe2C> 3, Fe OOH, T1O2, C ^ Oj ·

To further reduce the brittleness, known substances such as phosphates or borates of mono- or trivalent metals can be added for this purpose in a solution of up to 5% or in fine form.

The requirement that the non-combustibility of such a slab must be at least better than that of the class shall be met by the use of mineral constituents only.

By choosing the correct substances to be added to the water glass, their percentages and in particular the degree of fineness of the additives, a permanent film is formed which remains even during storage and does not become brittle. The adhesive has no corrosion effect on the metal film.

In particular, by selecting the amounts of alkaline earth metals and zinc oxides or carbonates, aluminas or hydroxides and / or barium sulphate within these limits, it is possible to ensure that the risk of embrittlement with regard to the applied adhesive is kept to a minimum.

The addition of mineral minerals further ensures that the adhesive used according to the invention is practically not likely to adversely affect the fibers and / or the bond.

It is particularly advantageous that the additions of earth minerals and pigments can complement or replace each other and by limiting the amount of water-tolerant substances as above, it has been possible to ensure that the adhesive remains elastic and flexible after drying. In this case, it is of particular importance to maintain the degree of drying in such a way that drying takes place under the conditions required for the reaction of the hardener.

Since the fillers in the adhesive are in a very finely divided form, the adhesive used according to the invention can of course be diluted by adding water and thus adjustable for easy application.

Since the adhesive used according to the invention does not cause corrosion in the metal film, but rather strengthens the film, this can be made relatively thin, as a result of which the film material cost can be saved.

The adhesive is applied mainly to the entire surface, as a result of which the strength of the metal film is increased.

The curing of the adhesive is achieved in the usual way by raising the temperature. To this end, substances must be added to the adhesive which give the adhesive sufficient storage stability and cause the adhesive to cure at temperatures which are technically convenient to achieve the properties required by the adhesive, for example elasticity, even after curing. In order to achieve sufficient storability 4 65734, it must be possible to prevent the different components of the adhesive from separating by segmentation and the reaction between the components taking place too early.

However, the adhesive used in accordance with the said Finnish patent fulfills its function very well in terms of its product properties.

However, it has been shown that the adhesive changes slightly, albeit slowly, during storage, as a result of which the working conditions of the equipment, in particular the temperature required for curing, must be adjusted according to the age of the adhesive to prevent curing too early or too late. An additional disadvantage due to curing due to temperature rise, although quite common, is the formation of significant amounts of water vapor, which must be removed from the thermal insulation materials in order to avoid changes in product properties.

The object of the invention is to propose the application of a method by means of which the storage stability of the adhesive could be made practically unlimited and its processing in the apparatus could be carried out under standard conditions.

This object can be solved by further developing the adhesive used in said patent into a spontaneously curable two-component adhesive.

The invention thus relates to a method for producing a mineral film tile coated with a metal foil in accordance with Finnish Patent No. 60,667, in which method a water glass-based adhesive to which an earth mineral substance has been added is used as the adhesive, the composition of which is as follows: 60-95% by weight of water glass, 4- 16% by weight of earth minerals, 1-5% by weight of oxides or carbonates of alkaline earth metals or zinc, aluminas or hydroxides or barium sulphate, hereinafter briefly referred to as additives, 0-5% by weight of pigments, and it is proposed that the fastest reactants are selected as additives or, in addition to or partially to replace them, 5 65734 reactants are selected particularly rapidly and are combined as a second component of the adhesive only shortly before or during use, and the process according to the invention is characterized by in addition or in part as a substitute for primary aluminum phosphate.

According to this proposal, the storage life of the adhesive is not only improved to a practically unlimited extent, but also its handling in the equipment can take place under standard conditions. Furthermore, the increase in the curing temperature has only a secondary or no significance, and the enrichment of steam in the product can be avoided. Besides, thermal curing no longer limits the execution speed of the equipment.

In addition, it has surprisingly been found that, in accordance with the proposal according to the invention, the properties of the adhesive required in Finnish Patent No. 60,667 can be combined with the properties resulting from the process technology in terms of the product.

In further developing the invention, it is expedient to use a metal film coated with a fiberglass gauze, in which case it is expedient to use a metal film having a fiberglass gauze attached to its surface using an adhesive according to the above-mentioned patent.

In the following, the working examples are clarified in more detail, in which case the proportion of solid is denoted by the abbreviation FS and the molar ratio is indicated by the abbreviation MV. The parts indicated are parts by weight.

Example I

Component 1 Component 2 72.0 parts of soda water glass, 20.0 parts of primary aluminum 7.0 parts of kaolin <10, u, »/ Al (H-PO.) ,, FS 50%

1.0 part AljO ^ * 4 J

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Example II

Component 1 Component 2 89.5 parts of soda water glass 10 parts of primary aluminum FS 35%, MV 3.3 phosphate 8.0 parts of kaolin <10 ^ Al (H2PO4) 3 'FS 50% 2.5 parts of ZnO <1

By mineral fiber board in accordance with the present invention is meant all planar, non-coiled, rigid, semi-rigid and soft mineral fiber products, such as lamellar boards, plywood boards or the like.

In the process according to Example I, the reactants which are too slow (oxides or carbonates of alkaline earth metals or zinc, oxides or hydroxides of aluminum and / or barium sulphate) are replaced by fast-reacting primary aluminum phosphate.

Following the procedure of Example II, an additional component is added to the adhesive.

Depending on the reaction rate of each component and the state of their aggregates, different working methods come into play. When working with immediately reactive components, the components may only be joined immediately at the time of gluing.

This can happen, for example, in the following ways:

Both components are applied separately to the film and tile. If this is not possible due to the excessive porosity of the slab, both components can be applied to the metal foil before the slab and film are joined together. If both components are liquid, these can also be mixed together in a spray device and sprayed simultaneously on the film and / or tile shortly before the layers are joined together. When using a powdered component, similar methods can be used. However, it has proved to be particularly advantageous when the powdered component is used to improve the adhesion to the metal film by using metal films with a glass fiber gauze applied to the surface, for example by means of an inorganic adhesive according to Finnish Patent No. 60,667. The treatment of the powdered component is then not substantially different from the working method of using two liquid components which are applied on top of each other.

Also when using two liquid components, it may be advantageous to use a metal film coated with glass fiber gauze to improve the mixing of both components when applying the adhesive. This promotes the penetration of both components. This procedure may be advantageous especially if one of the components, such as the acidic aluminum phosphate mentioned in the examples, would corrode the metal film. The use of metal foils coated with fiberglass gauze can also be justified for economic reasons, because in this case very thin metal foils can be used without disturbing the work.

From the point of view of further development of the invention, it may be most expedient, if necessary, to add to the at least one component, if desired during application, up to 10% of the total amount of both components, based on the sum of the two components.

Such organic elasticity enhancers are, for example, polyacrylates or synthetic gums, which are most preferably used in the form of an aqueous dispersion. When selecting substances, it must be taken into account that they are chemically compatible with the components and the adhesive in question. The quantities to be added must, of course, be dimensioned in such a way that the desired non-combustibility property of the final product is not lost.

Claims (1)

65734 Claim A method for producing a metal film-coated mineral fiber board using a water glass-based adhesive to which clay minerals have been added and having a composition by weight of: 60-95% water glass, 4-16% clay minerals, 1-5% alkaline earth metal or zinc oxides, or carbides oxides or hydroxides or barium sulphate, hereinafter briefly referred to as additives, 0-5% pigments, the fastest reactants being selected as additives or, in addition to or partially replacing them, particularly fast reactants being selected and combined as a second adhesive component only shortly before its use or in connection with its use, characterized in that primary aluminum phosphate is additionally used as a second component or as a partial substitute for additives. Fertilizers for framställning av en med en metallfilm belagd mineralfiberlat, vid vilket förfarande et head vattenglas baserat lim andändes, where it is försatt with lermineralämnen and with up to a maximum of 50%, wattage, 1-4%, jordalkalimetall- eller zinkoxider eller -carbonater, aluminaiumoxider ell -hydroxider elli bariumium sulfat, för vilka i det feldede i korthet användes biennningen tillsatsmaterial, 0- 5% special purpose is to react with the material and to combine the material with an adhesive with the same type of material, and the combination of the material with the original material.