FI60667C - MEDAL METAL FOOLS OEVERDRAGEN MINERALFIBERPLATTA - Google Patents

Description

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Patent neddelat ^ w (51) Kv.lk.3 / lnt.ci.3 B 32 B 15/121, FINLAND —FINLAND (21) P * t * nttlh »k * nHi * - PatMitiMSknlng 753549 (22) Hakamitpllvl - Amttknlngidag l6.12.79 * '(23) Aikupllvt — Glltifhctsdag l6.12.75 (41) Tullut | ulkl * «ktl - Bllvlt offwttlig 21.06. j6

Patent and registration authorities ........

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Patent-och registerstyrelien v 'An «ök» n utltgd och uii.ikrifi.ri published 30.11.81

(32) (33) (31) Pjrydetey atuoikaui —B «gird prloritat 20.12.7U

Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) P 2460508.1-43 (71) Saint-Gobain Industries, 62, Bd Victor-Hugo, 92209 Neuilly sur Seine,

France-Frankrike (FR) (72) Bernd Steinkopf, Ludvigshafen-am-Rhein, Erich Michael Krzyzanovski, Frankenthal / Pfalz, Federal Republic of Germany-Förbundsrepubliken lyskland (DE) (7U) Berggren Oy Ab (54) mineral mineral plate

The invention relates to a mineral fiber board coated with a metal film and used as an insulating sheet or the like.

It is known to use an organic adhesive as a binder or adhesive for attaching a metal film to such mineral fiberboards (U.S. Patent Nos. 2,899,147 and 3,276,928).

However, the use of such organic adhesives has the disadvantage that the mineral fiber boards coated with them no longer meet the requirements for the non-combustibility of heat and sound insulating materials.

One of the methods for making glass and mineral fiber insulations refractory is already known from German patent publication 957 465i, which uses water-soluble silicates, i.e. an inorganic substance, and the silicate is slightly alkaline and the substance is applied to the outer surface of the insulator. Thus, only the coating of the corresponding insulation board is performed here.

4 2 60667

The most preferred composition of such a silicate is one in which one part by weight corresponds to 3.2-3.65 (most preferably 3, -4) parts by weight of SiO 2 ·

The main purpose of the measure was to achieve the desired fire resistance, but at the same time to prevent the silicates from corroding the glass or mineral fibers due to their strong alkalinity. In addition, efforts were made to treat the insulating materials in such a way that the treatment of the insulating materials would no longer cause harmful skin irritation.

The problem of how mineral fiber preparations could be impregnated with inorganic substances and thus greatly reduce their flammability has long preoccupied technicians.

U.S. Patent No. 3,002,857 already mentions that the use of water glass or sodium silicate as a binder component in the manufacture of coated or bonded glass fiber products can result in the destruction or corrosion of glass fibers due to the high sodium concentration in commercially available sodium silicates.

This patent specification states the conditions that should be met for the assembly of glass fiber or film coatings or binders: 1. The constituents of the binder assembly must adhere well to the upper surface of the glass fibers or glass film below the temperature at which the fiber-forming glass melts. This adhesion must take place in a relatively short time, in about 0.25-60 minutes and at a temperature below 650 ° C, mainly between 315-650 ° C · 2. The binder or coating must be able to withstand moisture and must not swell on the mineral fiberboard in humid conditions. .

3. The constituents of the binder or coating material shall not corrode the glass fibers, as is the case with sodium silicate, when they are in the form of an assembly in which they are applied to the surfaces of the glass fibers or glass films. They must also not adversely affect the strength, flexibility or other desirable properties of the glass fibers or films.

3 60667 4. The composition of such an inorganic binder or coating shall not corrode the metal.

5- This substance should be able to be manufactured at low cost and from relatively readily available materials and should be applied with standard equipment so as to result in an improved product without a significant increase in cost.

To solve this problem, U.S. Patent No. 3,002,857 suggests that the materials in the composition be in the form of an aqueous system and react with the glass fiber surfaces at the relatively high temperatures indicated above to form a glassy material that adheres firmly to the glass fiber surfaces.

Not only is it necessary to use the stated uneconomically high temperatures in the manufacture of such a coating, such a binder or coating material produces only a coating of private fibers, possibly only on the upper surface, which reacts with glass or other mineral fibers. Apparently, no uniform layer is formed on the surface of the product made from the fibers thus treated, but only a firmly attached cover covering each private fiber, which transforms the fibers so that the requirements are met.

U.S. Pat. No. 3,002,857 also already mentions that clay or other water-soluble or water-dispersible metal silicates, carbonates, hydroxides or oxides commonly present in glass can be used as fillers.

U.S. Pat. Nos. 3,286,785 and 3,906,065 disclose a sound and heat insulating sheet made of mineral fibers with a thick layer on at least one side, the function of which is primarily to act as the main or sole load-bearing element extending over the sheet and thus as the sole sheet. as a guarantor of the integrity of the structure in the event that the non-impregnated layer beneath it weakens, softens or melts and the mineral fiber resin binder burns.

The impregnating agent used in the manufacture of this layer contains 11,60667 of comminuted inorganic material and a binder phase consisting of 5 to 95% by weight of silicic acid sol and 95 to 5% by weight of bentonite, and the total solids content of the impregnating agent is 2 to 25% by weight. The material produced thus contains 1-20% by weight of silica sol and 1-15% by weight of bentonite, in addition to which it may also contain gray clay and feldspar. Additives can also be used. However, such impregnating agents are very expensive and their use is practically advisable only in special cases.

Finally, German Offenlegungsschrift No. 1,919,764 discloses a method of manufacturing refractory insulation boards and moldings in which such moldings are treated with diatomaceous earth. with a solution of water glass to form an insulating cover layer. It is clear from the detail that the molding must be kept in a vibrating motion during the treatment with the diatomaceous earth-water glass solution and the molding must be completely immersed in this solution, that this is not a coating that meets certain requirements. Mortgages in particular have proven to be quite fragile.

The invention is intended to produce a mineral fiber board coated with a metal film, primarily an aluminum film, to be used as an insulating sheet or the like, which meets the following requirements:

The plate must be non-combustible, i.e. the degree of non-combustibility must be at least one order of magnitude higher than that of ordinary sheets coated with an organic adhesive.

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

The adhesive must also not have any detrimental effect on the metal film used as the coating, in particular the aluminum film, i.e. it must not substantially corrode this or even in some places become brittle or otherwise have an adverse effect.

Finally, the adhesive must still be easy to apply.

Meeting these requirements presents certain difficulties, as care must be taken to ensure that compliance with one requirement does not make it impossible to meet another.

The invention therefore relates to a mineral fiber board coated with a metal film, in particular an aluminum film, attached to a water-glass-based binder, characterized in that the binder used contains clay minerals in addition to water glass and has the following composition by weight: 60-95% water glass 4-16% clay minerals 5% alkaline earth or zinc oxides or carbonates, aluminas or hydroxides and / or barium sulphate 0-5% dyes 0-5% phosphates or borates of metals of value 1-3 in solution or finely divided form suitable for application techniques, diluted with water, where water additives are as fine-grained as possible.

Suitable clay minerals are kaolin, clay or the like talc, or mixtures of these additives.

If dyes are used, they are mainly Fe 2 O 2, FeO OH, TiO 2, Cr 2 O 3 «

Phosphates or borates are intended to reduce brittleness.

The requirement that the degree of non-combustibility of such a sheet be improved to at least one grade higher is met by the use of mineral components only.

By selecting suitable additives for the water glass, in a suitable percentage and a certain degree of comminution, a well-adhering film can be produced which remains even when stored and does not become brittle. The adhesive does not corrode the metal film, especially the aluminum film.

In particular, the choice of the amounts of alkaline earth alkali and zinc oxides or carbonates, aluminum oxides or hydroxides and / or barium sulphate within the stated limits ensures that the risk of embrittlement of the adhesive used for the coating is kept to a minimum.

The addition of clay minerals ensures that the adhesive used according to the invention cannot in practice damage the fibers and / or their adhesion.

It is particularly advantageous that clay minerals and dyes can be used to complement or replace each other and that limiting the water-resistant substances ensures that the adhesive remains elastic and flexible. In this case, it is also very important that the degree of dryness is kept such that drying takes place under the conditions necessary for the reaction of the hardener.

The adhesive according to the invention, due to the very fine fillers present, can be diluted simply by adding water and thus made easy to apply.

Since the adhesive used according to the invention does not corrode the metal film, but even strengthens it, it can be chosen to be relatively thin, rm ^ a means a saving of the film material.

The adhesive is most preferably applied to the entire surface, which increases the strength of the metal film.

The following working examples are intended to illustrate the matter; the abbreviation PS denotes the proportion of solid and the abbreviation M.V. denote the molar ratio. Percentages refer to weight percentages.

Example I

89.5% soda water glass, PS 35% MV 3.3 8% kaolin <10 μl

2.5% ZnO <1 / U

Example II

86% soda water glass 35% MV 3.3

8% clay <5 / U

3% MgO <10 ju 3% Pe 2 O 5 c 1 / u

Claims (4)

7 60667 Example III 85. potassium water glass PS 29% MV 4.1 7. talc> 10 4. Al OOH> 5 / U 4. sodium polyphosphate Mineral fiber board coated with a metal film attached to a water-based binder, characterized in that the binder used contains, in addition to water glass, clay minerals and has the following composition by weight: 60-95 f water glass 4-16% clay minerals 1-5 l alkaline earth or zinc oxides or hydroxides or aluminas or hydroxides and / or barium sulphate 0-5% pigment 0-5% of phosphates or borates of 1-3 values in dissolved or finely divided form suitable for application techniques, diluted with water, whereby the water glass additives are as fine as possible. Mineral fiber board according to Claim 1, characterized in that the clay mineral substances are kaolin, clay or the like, talc or a mixture thereof. Mineral fiber board according to Claim 1 or 2, characterized in that the pigment is Pe 2 O-, FeO OH, TiO Cr 2 O 3. Mineral fiber board according to Claims 1 to 3, characterized in that the binder mixture contains 1 to 5% of MgO, MgCO 2, Cr 2 O 2, Al., 0.1 Al (OH).