FI65733B - FRAMEWORK FOR METAL FILMING IN METAL FILM BELAGD MIERALFIBERBANA - Google Patents

Description

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Patent, och raglrtwityral — n '7 amMcm wd ^ rf «* vtUkrUtoa puMemd 30.03.84 (32) (33) (31) Pnr4« «* jr etueMwi · —h | M prtorlut 02.02.76

Federal Republic of Germany Förbundsrepubliken Tyskland (DE) P 2603904.3 (71) Saint-Gobain Industries, 62, Bd Victor Hugo, F-92209 NeuMly sur Seine, France-Frankfurt (FR) (72) Bernd Steinkapf, Ludwigshafen-am-Rhein, Erich Michael Krzyzanowski, Frankenthal / Pfalz, Peter Hackenberg, Ludwigshafen-am-Rhein, Federal Republic of Germany Förbundsrepubliken Tyskland (DE) (74) Berggren Oy Ab (54) Method for the production of a coated mineral fiber web - Förfarande förstälande för metallfilm belagd mineralfiber-bana

Finnish patent No. 60,668 proposes the production of a mineral fiber web coated mainly with aluminum foil, which makes it possible to satisfy the following requirements:

The track must not be hot, ie. in terms of non-combustibility, it must be of at least order of magnitude better than conventional lines coated with organic glue.

In addition, the adhesive must not adversely affect the bond, fibers and / or bond between the mineral fiber web and the metal film. The track must not harden due to the use of glue, i.e. it must remain coiled.

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

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Finally, the adhesive used must be easy to apply.

Satisfying the notified requirements poses certain difficulties, as it must be borne in mind that meeting one requirement does not remove the conditions for meeting another.

The said Finnish patent thus relates to a mineral fiber web coated with a metal foil, which is made of a water glass-based adhesive to which mineral minerals have been added and which has the following composition in weight percent: 60-95% by weight of water glass 4-16 "mineral minerals 1-5" alkaline earth metals or zinc oxides or carbonates, aluminum oxides or hydroxides and / or barium sulphate 0-5 "pigments, as an aqueous dilution adapted to the application technique, the substances 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 Fe 2 O 2, FeO OH, TiO 2, C 2 O 2 ·

To further reduce the brittleness, known substances such as phosphates or borates of monovalent 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 track must be at least better than the class will be met by using only mineral ingredients.

Proper selection of the substances to be added to the water glass, their percentages and in particular the degree of fineness of the substances to be added, results in the formation of a permanent, well-adhesive film which does not become brittle, so that the ability to wind the coated mineral fiber web is completely good. The adhesive has no corrosion effect on the metal film, especially on the aluminum film.

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

The curing of the adhesive is achieved in the usual way by raising the temperature. In this case, substances must be added to the adhesive which give the adhesive sufficient storage stability and cause the adhesive to cure at temperatures that are technically comfortable to achieve, while maintaining the properties required of the adhesive, e.g. elasticity, even after curing. In order to achieve sufficient storability, it must be possible to prevent the various components of the adhesive from separating by sedimentation and the reaction between the components from taking place too early.

Admittedly, the adhesive used in accordance with that 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 premature or late curing. 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 heat release agents 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.

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The invention thus relates to a process for the production of a mineral film web coated with a metal film, which process uses a water glass-based adhesive to which clay minerals have been added and the composition of which is as follows: 60-95% by weight of water glass 4-16 "" clay minerals 1-5 "" oxides or carbonates of zinc, oxides or hydroxides of aluminum or barium sulphate, hereinafter briefly referred to as additives, pigments 0 to 5 "", in which case the most reactive substances are selected as additives or, in addition to or partially to replace additives, particularly fast-reacting substances are selected and combined as another adhesive component with this only shortly before or in connection with its use, and the process according to the invention is characterized in that primary aluminum phosphate is additionally used as a second component or as a partial substitute for additives.

According to this proposal, not only does the storage stability of the adhesive improve virtually unlimited, 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. In addition, 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. 60,668 can be combined with the properties resulting from the process technology for the product.

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

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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 alum FS 35%, MV 3.3 minium phosphate

Al <H2PO4) 3, FS 50% 7.0 parts kaolin <10 ^ u 1.0 parts A ^ O ^

Example II

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

According to the invention, the mineral fiber web is understood to mean all planar mineral fiber preparations, such as, for example, mats, gauze, blankets or tapes, in particular all windable mineral fiber preparations.

In accordance with Example I, too slow-reacting substances (oxides or carbonates of alkaline earth metals or zinc, aluminum oxides or hydroxides 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, 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: 6 65733

Both components are applied separately to each adhesive web. If this is not possible due to the excessive porosity of the second web, as in the case of felts, for example, both components can be applied to a metal foil before the webs are laminated to each other. If both components are liquid, these can also be mixed together in a spray device and sprayed simultaneously on the film and / or track just before laminating the tracks to each other. When using the powdered component, similar methods can be used. However, it has proven to be particularly advantageous when the use of powdered components improves 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 the above-mentioned patent. 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. Thus, penetration of both components is promoted. This procedure may be advantageous especially if one of the components, such as the acidic Aluminum Phosphate mentioned in the example, 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.

In the further development of the invention, it may be expedient, if necessary, to add to the at least one component, if desired during application, up to 10% of the sum of the two 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 this way; that the desired non-combustibility property of the final product is not lost.

Claims (1)

A process for producing a metal film-coated mineral fiber web using a water glass-based adhesive to which clay minerals have been added and having a composition by weight as follows: 60-95% water glass, 4-16% clay minerals, 1-5% alkaline earth metal or zinc oxides or zinc oxides , aluminum oxides or hydroxides or barium sulphate, hereinafter briefly referred to as additives, 0-5% pigments, in which case more rapidly reactive substances are selected as additives or particularly fast-reacting substances are selected in addition to or partially to replace the additives and are combined as a second adhesive component only shortly before or in connection with its use, characterized in that primary aluminum phosphate is used as a second component or as a partial substitute for additives. In the case of frameworks with a metal content of a minimum of 60% to 95% of the wattage, 4 to 16% of the wattage, 4 to 16% w / w, 5% jordalkalimetall- or zinc oxide eller -carbonate, alumina oxide ell -hydroxider or barium sulphate, for use in the manufacture of bulk materials, 0-5% However, a specific type of reactant material and a combination of materials and an additional limiting component are provided for the purpose of the application of the material, and the combination of an additional type of material or an additional material.