Flat laminated fire protection sheets

The invention relates to a flat fire debris material Of hydrous base, fiber-reinforced sodium silicate, which is provided with a protective layer.

Fire prevention materials of hydrous alkali metal silicates have long been known and are already being varied for the preventive fire protection used. They cause at high Temperatures, as arise, for. Example, in case of fire, by foam education, increase in volume and formation of a Blähdrucks excellent insulation against fire and smoke, and thus lead sealing of openings and passages in building structures ago at. Such materials and processes for their preparation are described, for. example, in DE-B 11 69 832. In said Publication is recommended that the fire protection plates against the Evaporation of water by plastic layers, eg., Poly ethylene coatings to protect. However, these are for carbon dioxide permeable, which by chemical reaction, the effectiveness of hydrous sodium silicate reduces. According to DE-A 16 21 799 are therefore firmly adhering (coating of epoxy resin / hardener Ge mix applied to the fire-resistant panels.

Commercial Fire Protection Boards, eg. B. Palusol BASF AG, a maximum of 4 mm thick. Problems arise, therefore, when constructively requires broader structural joints or joints with varying gap should be broad sealed, such as joints on fire protected attic stairs.

These problems are solved when at least a layer A combined hydrous, fiber-reinforced sodium silicate at least one layer B made of a flexible open-celled Foam.

The layer A is generally in the form of plates, z. B. may be 210 cm long, 110 cm wide and 1 to 5 mm thick. This can also already ge to 2 to 10 cm wide strips be cut.

The fire protection material consists of hydrous sodium silicate with a water content of 20 to 50, preferably from 25 to 40 wt .-%, which up to the glass reinforcing fibers in quantities of 2 20 wt .-% added. Further details on the structure and Manufacture of fire protection material are in the cited regulations described. The fire protection material is usually coated with an epoxy coating and with a protective layer, z. B. with an aluminum film or with a film made of polyester, Polyethylene, polyvinyl chloride or paper laminated.

Layer B consists of a flexible, open-cell foam. Suitable foams are made from condensation resins based on Melamine, urea and phenol-formaldehyde. particular preference are resilient foams based on melamine resin, as z. B. EP-B 71 672 are described. A suitable foam z. B. BASOTECT BASF AG. These foams have in general mean a specific weight of 5 to 100 g / l, in particular 8-20 g / l and a thickness of 5 to 50 mm, preferably from 10 to 30 mm.

You can reach the fire test according to DIN 4102 in general, Fire protection class B. 1

In addition to the flexibility effect brings the foam even his good qualities regarding thermal insulation and Soundproofing a; in case of fire beginning it prevents (continuous use temperatures up to 150 ° C) the passage of toxic fumes in the further development of the fire closes the from about 100 ° C which forms Silicate foam sure the joint to smoke.

A preferred sequence of layers is ABA, is sufficient in some cases a two composite AB; for very wide columns can also Composite BAB, ABAB or ABABA be low. The layers A and B can with a double-sided adhesive tape or with conventional Adhesives, z. B. based on acrylates, rubber or phenol resins are joined together.