CS231948B1 - Fireproof foammaking silicon layer with a smooth surface and a continual method of its preparation - Google Patents

Description

It is an object of the present invention to provide a fire-resistant, smooth-surface, fire-resistant foamed silicate layer for protecting wood, plastic or any other combustible materials. The invention also relates to a continuous process for the preparation of this layer.

Increasing the fire resistance of flammable materials such as wood or hardboard is commonly accomplished by coating inorganic salts such as ammonium phosphates, sodium tetraborate or alkali silicates.

and

Another possibility is the application of formaldehyde-urea condensates which are filled with active inorganic substances, for example diatomaceous earth, ammonium sulfate or perlite. The effect of these substances on sustained thermal exposure is low.

A higher effect is achieved by protecting the combustible material with a fire-retardant layer containing alkali silicates, a small amount of surfactants, and substances containing bound water, such as magnesium ammonium phosphate hexahydrate. This fire-retardant is poured onto the non-woven glass staple and can be applied directly to flammable materials without gluing. After drying, the resulting fire protection layer is coated with epoxy paints against surface effects.

By the effect of fire, the silicate layer described above creates a low thermal conductivity foam.

The foam is stable up to 900 ° C. In this case, the heat resistance of the wood increases three-fold. A disadvantage of said silicate layer is its rough surface and discontinuous manufacturing process.

The aforementioned disadvantages of the prior art are eliminated by a smooth surface fire-retardant layer based on alkali silicates containing surfactants and water-binding substances applied in suspension to the non-woven glass staple of the present invention, which consists of a water suspension glass having a weight of 1000 g per m ^{2 of} nonwoven staple fibers, the suspension comprising 40 to 80 wt. % water,

0.1 to 120 wt. % finely ground fireclay and optionally 0.0001 to 10 wt. % of a plasticizer, such as an aqueous solution of sodium bis- (2-ethylhexyl) -a-sulfobutanediolate at a concentration of 43 to 55 wt. %, based on the weight of the waterglass applied to the nonwoven staple lined with an aluminum foil having a thickness of 0.01 to 0.5 mm, which layer is coated on its surface with an epoxy paint layer or a polyolefin plastic coating.

It is an object of the present invention to provide a continuous process for preparing a smooth-surface, fire-resistant, foam-forming silicate layer comprising the step of adding to a waterglass containing 40 to 80 wt. 0.1 to 120 wt. % finely ground fireclay and optionally 0.001 to 10 wt. % of a plasticizer such as an aqueous solution of sodium bis- (2-ethylhexyl) -a-sulfobutanediolate at a concentration of 43 to 55 wt. %, the resulting suspension weighing 1,000 g to 5,000 g per 1 m ^{2 of} nonwoven staple fiber is continuously applied to a moving nonwoven glass staple, backed with an aluminum foil with a thickness of 0.01 to 0.5 mm, then the raw fire protection foil is dried and after maturing they are coated with an epoxy paint or a polyolefin plastic coating.

In order to illustrate the subject matter of the invention, examples are given without limiting the scope of the invention. \

Examples

1. A 50 ° Bé water glass (water content of 50% by weight) and a finely ground chamotte in an amount of 3% by weight are charged into an industrial mixer. % by weight of water glass. A suspension corresponding to a dose of 3,225 g of suspension per 1 m ^{2 of} moving glass nonwoven staple of 550 g / m ² , backed with aluminum foil, is dispensed through the mixer. After the suspension has been soaked in the staple, the raw fire-resistant foaming foil is passed through a drying box and equal to rollers (kslanders).

Formatting and maturing of cut sizes follows. · The last treatment is the application of epoxy paint on the prepared film.

2. 44 ° Bé water glass, finely ground Samot, is dispensed into the industrial mixer,

Even in an amount of 6 wt. % and 1 wt. % sodium bis- (2-ethylhexyl) sulfobutanediolate in the form

50% aqueous solution (% by weight means); raw material doses are by weight

About water glass. 2640 g of suspension per 1 m moving glass staple of 450 g / m ² , supported by an aluminum foil, are metered through the mixer outlet. After the suspension has been soaked in the staple, the raw fire-resistant foaming foil is passed through a drying box and straightening rolls (calenders). The last modification is wrapping the produced foil with a polyolefin plastic wrap.

3. In a blender, mix 50 ° Bé water glass with finely ground sheaot in an amount of 100% by weight. % by weight of water glass. The resulting thick suspensions are directly applied to a wood panel which should be protected from the effects of fire. After drying of the fire-fighting foam layer, its surface is protected against the effects of external influences by coating with an epoxy paint.

4. Charge a 52 ° Bé water glass and finely ground chamotte in an amount of 10% by weight into a vessel equipped with a stirrer. %, based on the total weight of the waterglass. After mixing from the mixing vessel, the batch is dosed onto a non-woven glass staple of weight

300 g / m ² , backed with 0.5 mm thick aluminum foil, suspension of 2,000 g / lm ^{2 of} nonwoven staple fiber.

After the suspension has been soaked in the staple, the raw fire-resistant foam-forming silicate layer is dried and finally coated with an epoxy paint protective layer.

The effect of the invention is manifested in particular by the fact that the thickness of the original film with a smooth surface is increased from 5 to 30 times after foaming in the range from 250 [deg.] C. to 1050 [deg.] C. after foaming.

Specifically, a fire-resistant foam-forming silicate film having a smooth surface of 2.5 mm thickness was produced by the process of Example 1, but its heat exposure increased to 30 mm in 4 minutes by heat exposure at 800 ° C.

According to the second embodiment, a fire-resistant silicate foil with a smooth surface of 1.7 mm was produced and its thickness increased to 9 mm in 6 minutes at a temperature of 400 ° C.

A fire-resistant foam-forming silicate film of 1.5 mm thickness was produced by the method of Example 4 and its thickness increased to 8 mm in 3 minutes at a temperature of 900 ° C.

Claims (2)

CLAIMS 1. An alkali silicate-based, fire-resistant, flame-retardant layer comprising a surfactant and a water-binding agent applied in suspension to a non-woven staple fiber, characterized in that it comprises a waterglass suspension weighing 1000 g to 5 000 g. g per 1 m @ 3 of nonwoven staple, the suspension comprising 40 to 80 wt. % water, 0.1 to 120 wt. % finely ground Samota and optionally 0.0001 to 10 wt. % of a plasticizer, such as an aqueous solution of sodium bis- (2-ethylhexyl) sulfobutanediolate in a concentration of 43 to 55 wt. %, based on the weight of the waterglass, which is applied to a nonwoven ♦ glass staple, backed with an aluminum foil of 0.01 to 0.5 mm thickness and is coated on its surface with an epoxy paint layer or a polyolefin plastic coating. 2. A process for the continuous preparation of a fire-resistant foamed silicate layer and a smooth surface according to claim 1, characterized in that it is added to a waterglass containing from 40 to 80 wt. 0.1 to 120 wt. % finely ground Samota and optionally 0.001 to 10 wt. % of a plasticizer, such as an aqueous solution of sodium bis- (2-ethyl-hexyl) -a-sulfobutanediol at a concentration of 43 to 55 wt. %, based on the weight of the waterglass, the resulting suspension weighing from 1000 g to 5,000 g per m ^{2 of} nonwoven staple fiber is continuously applied to a moving nonwoven glass staple, backed with an aluminum foil with a thickness of 0.01 to 0.5 mm, Then, the fire protection foils are au- tomatic and after maturing they are coated with an epoxy paint or polyolefin plastic cover.