CS251161B1 - Panel with increased fire resistance - Google Patents

Abstract

The panel with increased fire resistance, which has a relatively low surface weight and significantly reduced formaldehyde release, consists of at least three layers, of which the middle layer is formed by a hardened mixture of at least 80 parts by volume of expanded perlite, 15 parts by volume of phenol-formaldehyde resin, a wetting agent and a catalyst in the form of formic acid amide. The middle layer is optionally reinforced with a middle reinforcing layer and sheathed with chipboard or reinforcing layers based on acrylate dispersion.

Description

The invention relates to a lightweight, hygienically sound panel with increased fire resistance, particularly suitable for interior partitions of buildings.

The hitherto known panels, suitable for interior partitions of buildings, do not solve the problem of hygienic safety and increase the fire resistance comprehensively. Silicone-based inner partitions have a high weight, which often does not allow use in light prefabricated buildings. Lightweight interior partitions are generally made of wood agglomerated materials bonded with urea-formaldehyde resins, which presents hygiene problems due to the release of free formaldehyde into the atmosphere. Also, the fire resistance of agglomerated wood panels is often not sufficient and therefore these panels have a limited usability character.

The drawbacks of these known panels are overcome by a panel according to the invention consisting of at least three layers, the outer shells of which are agglomerated fibreboard and particleboard materials which are connected to the central layer by their inner surfaces; The invention is based on the fact that the middle layer consists of a hardened mixture of at least 80 parts by volume of expanded perlite, 13 parts of phenol-formaldehyde resin, water, wetting agent and carboxylic acid amide catalyst and is reinforced by central reinforcement. According to a preferred particular embodiment of the invention, the panel layers of the panel are surface-closed with a strengthening

251 181 layer based on an acrylate dispersion.

The central part of the panel is manufactured continuously in the form of a sheet of expanded perlite coated with a phenolic resin, which guarantees a very low content of free formaldehyde. These panels make it possible to comply with a hygiene standard for the content of free formaldehyde in the air, i.e. 0.135 mg / m @ 2 of air, when used in buildings.

The surface treatment is usually carried out either in a single production process simultaneously with the sheathing of the central plate, then it is possible to speak of the surface treatment of the plates by lamination, enamelling, varnishing etc. or a double manufacturing process, for example leveling compounds which can be subsequently surface treated. The basic design of the partition panel can also be unpainted.

The panel according to the invention has a low bulk density, which is about 300 kg / m @ 2, thereby making the transport from the manufacturer to the processor or to the place of installation progressive. Another advantage lies in the fact that asbestos materials, which are also harmful in certain respects, are not used in the actual production, while maintaining the increased fire resistance parameters.

1 is a vertical cross-section of a panel coated with a laminated or enamelled chipboard, and FIG. 2 is a vertical cross-section of a panel having a central reinforcement layer in the middle of its thickness.

The panel according to the invention, which has increased fire resistance and is intended in particular for making interior partitions of buildings, consists in the first exemplary embodiment (FIG. 1) of three base layers,

- 3,251,161 coated with two shells 2 of a hardboard panel, top-laminated or enamelled, and a middle layer JL of a cured mixture comprising 80 parts by volume of expanded perlite, 13 parts by volume of phenol-formaldehyde resin, water, wetting agent and a catalyst which is formic acid amide. In this example, both sheaths 2, which are bonded to the middle layer 1 and which can improve the appearance of the panel, provide the necessary mechanical and physical properties to the panel.

In the second embodiment (FIG. 2), the middle layer 1 of the same composition as in the previous embodiment is provided with a middle reinforcing layer 2 in the middle of its thickness, which increases the flexural strength of the panel, increases its puncture resistance and the like. The reinforcement layers 4 are based on an acrylate dispersion and these reinforcement layers can be colored.

By combining the constructional modifications according to the invention, a wide variety of lightweight panels and possibly other building and lightweight prefabricated products can be produced having different properties and fields of application, e.g. .

Claims (2)

Panel having increased fire resistance, in particular for interior partitions of buildings, consisting of at least three layers, the exterior shells of which are mainly agglomerated particleboard or fibreboard, which are internally attached to the middle layer, characterized in that the middle layer / 1) consists of a hardened mixture of at least 80 parts by volume of expanded perlite, 13 parts by volume of phenol-formaldehyde resin, water, a formic acid amide catalyst wetting agent and is optionally reinforced with a medium reinforcing layer (3). Panel according to claim 1, characterized in that the middle layer (1) or the jacket (2) is provided on the outside with a reinforcing layer (4) based on an acrylate dispersion.