SE430987B - FIRE PROTECTIVE COATING SYSTEM AND WAY TO PROTECT BUILDINGS OF METAL, CONCRETE OR LIKE IN FIRE - Google Patents

Description

\ J '| 15 20 SO "ß 7812M74 2 This known fire protection coating system is built up of 3 layers, the blown graphite-containing component forming a middle layer, which is applied to a per se known corrosion protection layer (basic coating) and which is covered by a self-curing silicate layer.

This self-curing silicate coating layer is obtained from a mixture of silicic acid compounds, such as water glass, reactive metal powders, metal oxides or metal hydroxides, which together with the water glass form a water-insensitive layer. In order to obtain as high a water resistance as possible of the silicate layer, it is recommended to use as alkali-poor alkali silicate as possible.

The purpose of this cover layer is to prevent the entire fire protection system from being protected and, even after inflation in the event of a fire, to prevent the inflated layer barriers from coming loose. With this coating system, in fire tests according to DIN 4102 in small-scale fire tests (according to DIN 18082), fire resistance class F 30 has been achieved with great certainty. In these tests, the fire resistance time was approximately H0-H5 min. On the other hand, a protection for more than 60 minutes which would correspond to fire resistance class F 60 could not be achieved, as the protective effect in the active layer was not sufficient for this and also cracks appeared in the cover layer, especially when coating profiles at corners ech edges, which enabled the attack of heat during air access to the well-insulating with at a higher temperature still oxidation-sensitive intermediate layer, whereby the protective effect was quickly reduced.

It has now been found that these disadvantages can be eliminated and that on the basis of inflatable graphite a protective coating can be obtained with which fire resistance class F 60 can be achieved even with a coating over edges and corners, if a special phenolic resin is used for bonding the blow graphite in the active layer and in addition the mixture of the active layer is added with aluminum hydroxide as an additional component, which by the endothermic dewatering process occurring under the action of heat and the water vapor formed thereby exerts an additional protective effect and when the cover layer is not built on the basis of metal silicate which has become water insensitive by reaction with metals or metal oxides, without a cover layer of at least partially solid alkali silicate is used. The present invention thus relates to a fire protection coating system for building parts of metal, concrete or the like which consists of a per se known anti-corrosion base layer, a foaming fire protection and producing an active layer based on blown graphite and a mixture of a halogen-containing elastomer and a phenolic resin as a binder and a self-curing, silicate coating, which is characterized in that an alkylphenol-formaldehyde resin is used in the active layer based on blown graphite as a phenolic resin and that the active layer, present in an amount of at least H kg / m2, in addition contains 30-80 parts of aluminum hydroxide per 100 parts of blown graphite and the silicate cover layer is formed by mixing and curing 100 parts of K-water glass with 50-150 parts of solid Na water glass, 0.5-7 parts Pb3Ou in the presence of water as diluent, this coating may possibly be provided with mineral fiber material and / or alkali hydroxide.

The halogen-containing elastomers are suitably polychlorobutadiene, which may be degraded by mastication.

In order to obtain a good bonding of the blown graphite, 15-30 parts of blown graphite are preferably used, preferably 20-28 parts of polychlorobutadiene, regardless of whether it has been masticated or not.

The alkylphenol formaldehyde resin is suitably used in such amounts that 5-25 parts of alkylphenol-formaldehyde resin are added to 100 parts of blown graphite. It is particularly suitable to use t-butylphenol-formaldehyde resin, but also other alkylphenol-formaldehyde resins, eg octylphenol-formaldehyde resin, can be used to advantage: The use of this binder combination according to the invention is essential, since the blown graphite which is inflated very strongly only when held together sufficiently so that it does not come loose or cracks form at corners and to the building part. Polyquinbutadiene acts as a thermoplastic binder in edges, which would allow free access to heat, and the phenolic resin, on the other hand, as a coke former, which makes the layer firmer. Additional strength in the inflated state can further be obtained if the active layer is mixed with mineral fibrous materials, such as asbestos or rock wool with, for example, a fiber length of 0.5-10 mm. The amount of fibers per 100 parts of blown graphite can suitably amount to 5-20 parts. The binder mixture can of course be supplemented with customary stabilizing additives oxide of magnesium or zinc (acid acceptors).

Essential for a disturbance-free function of the active layer is also the cover layer, which on the one hand is to protect the active layer and hold it together during inflation and, on the other hand, prevent the active layer from inflation and in addition be sufficiently gas-permeable to allow 1 row passage of gases evolving.

All this is achieved if, in contrast to what has previously been the case, a cover layer is used, which does not form a smooth, solid pore-free coating, but instead a layer which, upon drying, is known to form pores, so that an unobstructed gas passage is allowed. This is achieved with the cover layer according to the invention on the basis of potassium and soda water glasses, preferably those with a modulus of (3,5, which contains Pb50u as flux. The amount of Pb5Ou can be kept relatively low and suitably amounts to 0 per 100 parts by weight of potassium water glass. 5-7 parts .D 1 I 'h) OJ (I) .J <1 p.

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N 'd' fb CI * UI jtarhet in heat. It is also possible to increase the alkali content - the cover layer mass before application by adding alkali lye, preferably sodium hydroxide solution, as a good durability of the KQC and Na 2 O in the cover layer to SiO 2 in the cover layer should generally be 25-} 5:70, the weight ratio K2O: Na2O is about 2: 1. the mass is obtained before application. The application of the fire protection coating system according to the invention, which also forms the subject of the present invention, takes place by the coating layers being applied in succession. The per se known, anti-corrosion base layer is applied in the usual way as the bottom layer. As an anti-corrosion primer, alkyd resin-based coatings are especially suitable. Other systems, e.g. epoxy resin varnishes can also be used. This is followed by drying of the active layer after drying. The constituents of the active layer are then diluted with organic solvents such as aromatic hydrocarbons (benzene, toluene, xylene) or with Poon nuAuTv 55 g 55e12s4v ~ 1 mixtures thereof with ketones, preferably acetone or methyl ethyl ketone and such hydrocarbons, that spreadable or sprayable mass is formed. The amount of solvent usually amounts to about 100-200 parts per 100 parts of blown graphite. This compound can be applied with a spray gun or by filling, which must be taken into account when adding the amount of solvent. A sufficient protective effect, i.e. to safely achieve fire resistance class F 60, is obtained only when the active layer in dry form amounts to at least H kg / m2. Suitably applied between Ä and 5 kg / mg, which can be done in one or more applications.

Of course, a larger amount of application can also be used, but for amounts above 5 kg / m2, however, economic reasons and the layer thickness of the coating tolerable to the building component also play a role.

When the active layer has dried, this is coated with the cover layer, which is applied in the aqueous phase, whereby water serves as a diluent. The calivate glass was used in the preparation of the mixture to be suitably applied in the form of an aqueous solution, e.g. with a concentration of 30-H5% by weight, which can then be charged with soda water glass in solid form. The other constituents, such as Pb3Ou and possibly asbestos fibers and alkali hydroxide, are also mixed in solid form, after which the mixture is diluted with water to the required consistency.

Based on approximately Ä0% aqueous solutions of K-water glass, in most cases an additional 30-100 parts of water per 100 parts of K-water glass are required to obtain a soluble mass. The amount of asbestos fibers can amount to 30 parts and solid alkali hydroxide e.g. about 10 parts.

After application, in contrast to that according to Austrian patent specification 330320, the cover layer does not have a rigid structure, it instead has a porous structure which in heat provides an elastically flexible layer for protection of the foamed active layer below.

Testing of the fire protection coating according to the invention has taken place according to DIN U102 / Bl.2 resp. ÖNORM B 3800 / lei 2. In this case, the temperature in the interior of a with a coating according to kn 10 f \ J \) 1 b! C) 78126ë7-1 6 provided profile carrier of steel (type IPB 180) for 60 minutes on average does not exceed -HOOOC resp. nowhere exceed 50 ° C.

The invention is further illustrated by reference to the following examples.

Example 1. active layer with the following composition parts by weight blown graphite 20 parts by weight of polychlorobutadiene, masticated parts by weight of t-butylphenol-formaldehyde resin 10 parts by weight of asbestos fibers H8 parts by weight 2 parts by weight of aluminum hydroxide stabilizer (sterically hindered phenol, magnesium oxide) " DIN Ä102 (resp. ÖNORM B 5800) on two with sandblasting and priming by means of zinc chromate alkyd resin lacquer corrosion-treated IPB carrier 180 with a length of 5 ml a layer thickness of about 5 mm (thickness in the dry state) = ü .5 kg / m2 application rate in dry condition in 2 rounds. After drying, the cover layer was applied with the following composition (in a homogeneous mixture to a thickness of about 0.5 mm with a brush: 100 parts by weight of caliphate glass, solid (weight modulus 1.85 in the form of aqueous solution) 85 parts by weight of baking soda water glass, solid (weight modulus 5.5 finely ground) caustic soda manja (Pb3Ou) asbestos fibers 11 parts by weight _, parts by weight 21 parts by weight 61 parts by weight by the fire protection authority performed fire protection test according to ü102 or ÖNORM B 5800 showed a fire resistance class F 60. water 10 20 30 35 7812647-1 Example 2. active layer with the following. composition 100 parts by weight of blow graphite .24 parts by weight of polychlorobutadiene 10 parts by weight of t-butylphenol-formaldehyde resin 10 parts by weight of asbestos fibers In 55 parts by weight of aluminum hydroxide 2 parts by weight of stabilizer (sterically hindered phenol, magnesium oxide) 150 parts by weight of solvent (80% toluene, 10% acetone, 10% acetone, 10% was sprayed on a sandblasted and for corrosion protection with zinc-chromate-alkyd resin lacquer based steel plate (500x500xH mm) in a layer thickness (dry to lstând) of about 5 mm, which corresponds to a coating amount (in the dry state) of 5.0 kg / m2. After drying, the cover layer was sprayed with the same composition and application thickness as in Example 1. The plate was provided on the back with an approximately 30 mm thick stone wool mat against heat radiation. In fire tests in a standardized test furnace (DIN 18082), fire resistance class (DIN ü102) F 60 was obtained.

Example 5.

Ill tt active layer having the following composition parts by weight blow graphite parts by weight polychlorobutadiene parts by weight t-butylphenol-formaldehyde resin 10 parts by weight asbestos fibers 80 parts by weight 2 parts by weight 170 parts by weight solvent (according to Example 2) (dry charge 5.2 kg / m 2) was provided in the same manner in Example 2 with the same cover layer on an aluminum hydroxide stabilizer (according to Example 2) a steel plate and tested in a test furnace for its fire protection ability. Here, too, fire resistance class F 60 could be achieved. 78126ë7 ~ 1 Example H.

A 10% by weight parts by weight parts by weight 7 parts by weight 2 parts by weight 2 parts by weight are actively used in the following composition with blown graphite polychlorobutadiene t-butylphenol-formaldehyde resin asbestos fibers aluminum hydroxide stabilizer (according to Example 2) solvent according to Example 1 5 kg / m2) was tested according to Example 2 with the same cover layer on a steel plate in a test furnace with respect to the fire protection properties. Here, too, fire resistance class F 60 could be achieved.

Claims (2)

78126l + '7-1 “I Patentkrav. An anti-corrosion coating system for metal, concrete or similar components consisting of a per se known anti-corrosion primer, a foaming fire protection producing active layer based on blown graphite and a mixture of a halogen-containing elastomer and a phenolic resin, as binder and a self-curing, silicate coating, characterized in that an alkyl-phenol-formaldehyde resin is used in the active layer based on blown graphite as phenolic resin and that the active layer, which is present in an amount of at least 4 kg / mg, also contains 50-80 parts of aluminum hydroxide per 100 parts of blown graphite and the silicate cover layer formed by mixing and curing 100 parts of K-water glass with 30-150 parts of solid Na ~ water glass, 0.5-10 parts? B5O_ in the presence of water as diluent, wherein this topsheet may optionally be in admixture with mineral fiber material and / or alkali hydroxide. Coating system according to claim 1, characterized in that the halogen-containing elastomer consists of a polychlorobutadiene, which may be degraded by mastication. 5. A laying system according to claim 2, characterized in that the active layer contains 15-30 parts of polychlorobutadiene per 100 parts of blown graphite. Coating system according to one of Claims 1 to 5, characterized in that the active layer comprises 5 to 25 parts of alkylphenol-formaldehyde resin per 100 parts of blown graphite. Coating system according to one of Claims 1 to 8, characterized in that the active layer contains 5-20 parts of mineral fiber per 100 parts of blown graphite. Coating system according to one of Claims 1 to 10, characterized in that the alkylphenyl-formaldehyde resin is a tert-butylphenol-formaldehyde resin. Coating system according to one of Claims 1 to 6, characterized in that the cover layer contains 0.5-7 parts of Pb 3 Ou per 100 parts of K-water glass. 7812647-1 IQ Method of protecting metal, concrete or similar components in the event of fire using a fire protection system according to any one of claims 1 to 7 by application as a result of a primer, an active layer and a cover layer, characterized in that after application of a per se known anti-corrosion primer a mixture is sprayed on, which contains blown graphite, a chlorinated elastomer, an alkylphenyl-formaldehyde resin, aluminum hydroxide in an amount of 30-80 parts of blown graphite, optionally a mineral fiber, common stabilizer for chlorobutadiene and diluted with organic solvents, so that a coating of at least U kg / m2 dry active layer is obtained, whereupon after drying the active layer a mixture of 100 parts of K-water glass in aqueous solution together with 30-130 parts of solid Na-water glass, 0.5-10 parts of -Pb30u and optionally mineral fibrous material and solid alkali hydroxide, if desired with water as solvent. 9. A method according to claim 8, characterized in that the mixture used for applying the cover layer is further added with 30-100 parts of water per 100 parts of K-water glass present in aqueous solution. 78126LU7 ~ 1 Summary of three-layer fire-retardant coating system, the lower layer consisting of an anti-corrosion layer, intermediate layer t of a fire-foaming foam-based layer containing a halogen-containing elastomer and an alkylphenyl-formaldehyde as binder and also containing contains a content of 30-80 parts of aluminum hydroxide per 100 parts of blown graphite and as a cover layer such a base of potassium and sodium water glass with a content of 0.5-10 parts of Pb5Ou. With this coating system, building components are protected for more than 60 minutes.