FI60668B - MEDICAL METAL FOUNDRY MINERAL FERTILIZER - Google Patents

Description

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Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) P 2U60509.2 (71) Saint-Gobain Industries, 62, Bd Victor-Hugo, F-92209 Neuilly sur Seine, France-Frankfurt (FR) (72) Bemd Steinkopf, Ludwigshafen-am- Hhein, Erich Michael Krzyzanowski, Frankenthal / Pfalz, Federal Republic of Germany-Förbundsrepubliken Germany (DE) (7l) Berggren Oy Ab (5l) Mineral fiber web coated with metal foil - Med en metallfolie overdragen mineralfiberbana

The invention relates to a mineral fiber web coated with a metal film.

It is known to use an organic adhesive as a binder or adhesive for attaching a metal film to such mineral fiber webs (U.S. Patent Nos. 2,890,147 and 3,276,928).

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

Methods for making glass and mineral fiber insulation refractory are already known from German Patent 957,465; it uses soluble silicates, i.e. an inorganic substance, and the silicate is slightly alkaline, and the substance is applied to the outer surface of the insulating material. Thus, only the coating of the corresponding insulation board is performed here.

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The most preferred composition of such a silicate is one in which one part by weight of Na 2 O corresponds to 3.2-3.65 (most preferably 3> * 0 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.

Technicians have long been preoccupied with the problem of how mineral-fiber preparations could be impregnated with inorganic substances and thus greatly reduce their flammability.

U.S. Pat. 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 may result in the destruction or corrosion of glass fibers due to the high sodium concentration in commercially available sodium silicates. This patent states the conditions that should be imposed on 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 glass-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 components of the binder or coating material must 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.

4. The composition of such an inorganic binder or coating shall not have a corrosive effect on the metal.

6 0 6 6 8 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 required 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 mentions that clay or other water-soluble or water-dispersible metal silicates, carbonates, hydroxides or oxides commonly found 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 resin binder of the mineral fibers burns.

The impregnating agent used in the preparation of this layer contains comminuted inorganic material and a binder phase consisting of 5 to 95% by weight of silica sol and 95 to 5% by weight of bentonite, and the total content of the impregnating agent is 2 to 25% by weight. The material produced thus contains 1-20% by weight of silicic acid sol and 1-15% by weight of bento-4,60668 rivets, 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 Pat. No. 1,919,764 discloses a method of manufacturing refractory insulation sheets and moldings in which such moldings are treated with a solution of diatomaceous earth and 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 web coated with a metal film, primarily an aluminum film, which meets the following requirements:

Hainan must be non-combustible, i.e. the degree of non-combustibility must be at least one order of magnitude higher than ordinary webs coated with organic glue.

In addition, the adhesive used to bond the mineral fiber web and the metal film must not damage the fibers and / or their adhesion. The web must not harden from the use of the adhesive, i.e. it must be possible to roll it.

The adhesive must also not have any detrimental effect on the metal film used as the coating, 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 poses certain difficulties, as care must be taken not to make it impossible to meet one requirement.

5,60668

The invention therefore relates to a mineral fiber web coated with a metal film attached to a water glass-based binder and 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 1-5% 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 dissolved or finely divided form diluted in water in a proportion suitable for the application technique used, diluted with water whereby the water glass additives are as fine 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,

TiCl 2, c ^ o ^.

Phosphates or borates are intended to reduce brittleness.

The requirement that the degree of non-combustibility of such a web be improved to at least one class is met by the use of mineral ingredients only.

By selecting suitable additives for the water glass, in a suitable percentage and a certain degree of comminution, a uniform, well-adhesive film which does not become brittle can be produced so that it can always be wound on a roll. The adhesive does not cause corrosion in the metal film, specifically in 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.

6 60668

It is particularly advantageous that clay minerals and dyes can be used complementary or substituting 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.

Thus, since the adhesive used according to the invention does not corrode the metal film, but even strengthens and stiffens it, it can be chosen to be relatively thin, for example about 10 cm, so that the film material can be saved and also ensures that the web is as it is. always bendable on a roll.

The adhesive can be applied to the entire surface. But it is expedient to apply it as transverse lines on the surface of the mineral fiber web or possibly as spots according to a pattern of your choice. Several methods of applying the adhesive are available, for example, from the German utility model application 1 88l 215.

The implementation examples are described in more detail below; the abbreviation FS denotes the proportion of solids and the abbreviation M.V. moolisuh-ratio. The percentages given are by weight.

Example I

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

2.5% ZnO <1 / U

Example II

86% soda water glass FS 35% MV 3.3

8% clay <5 / U

3 l MgO <10 / U

3% Fe 2 O 2 <1 / U

Example III

85% potassium glass FS 29% MV 4.1 7% talc <10 ^ u

Claims (4)

7 4. ai ooh 5 / U 6 0 6 6 8 4. sodium polyphosphate According to the patent application, mineral fiber webs are understood to mean all flat mineral fiber preparations such as carpets, nonwovens, blankets or strips. Mineral fibrous web coated with a metal film attached with 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 1-5% alkaline earth or zinc oxides or hydroxides or aluminas or hydroxides and / or barium sulphate 0-5% pigment 0-5% phosphates or borates of metals of value 1-3 in dissolved or finely divided form, suitable for application techniques, diluted with water, the water glass additives being as fine as possible. Mineral fibrous web according to Claim 1, characterized in that the clay mineral substances are kaolin, clay or the like, talc or a mixture thereof. Mineral fiber web according to Claim 1 or 2, characterized in that the pigment is Pe 2 O 2, FeO OH, TiO 2, Cr 2 O 2. Mineral fiber web according to Claims 1 to 3, characterized in that the binder mixture contains 1 to 5% of MgO, MgCO 2, Cr 2 O 3, Al 2 O 3, AlO (OH).