DE2451805A1 - Composite, thermally insulating, wall coating (stucco) - comprises polyurethane foam, reinforced, mineral, stucco, and an optional acrylic binder - Google Patents

Abstract

A heat-insulating coating for (outside) walls (facades) comprises (a) a flame-resistant polyurethane foam, as thermally insulating layer, which may be directly foamed Onto the wall, with the simultaneous use of an adhesion adjuvant (I), or indirectly applied in form of foam slabs, followed by treatment with a (I); and (b) a mineral, glass-fabric-reinforced, coating, up to 25 mm. thick. The coating comprises with standard DIN 4108.

Description

Thermal insulation @assadenputz The full thermal insulation corresponds to the Experience about 2 to 3 times the minimum insulation value according to DIN 4108. You so far Usual heat-insulating facade plasters mostly use as a heat-insulating element expanded polystyrene. The measured values for type PS 20 according to DIN 52612 are enclosed 10 ° C: # = 0.029 kcal / m # h # ° C. The application on the mural is with a Series of work steps coupled: 1. Gluing the individual polystyrene plates with a dispersion adhesive / cement mixture 2. Filling the panels with a dispersion / cement mixture 3. Insertion of glass fabric 4. Fill in the glass fabric with the mixture Point 2 5. Applying the course plaster These steps are detailed very complex and expensive.

Further heat-insulating facade insulation are the so-called curtains Facade. In this process, you can basically differentiate between 2 versions: a) Polystyrene as a heat insulating element directly on the wall former b) as a correct flammable or flame-retardant version: phenolic resin bonded glass or rock wool as a heat insulating element. These are attached with a so-called rear-ventilated facade. The outer facade usually consists of plastic-coated sheets, anodized Al sheets, asbestos cement panels, etc.

Version b is even more expensive than version a.

Further options for full thermal protection are offered by the so-called.

Sandwich elements, e.g.

a) Outside: concrete middle: polystyrene Inside: concrete b) Outside: metal or Asbestos-cement facade center: polystyrene Inside: wood or plasterboard panels The aforementioned However, there are always large construction options for heat-insulating facades Defects. All elements with polystyrene have the disadvantage that this is only temporary on c @. 100 ° C heated, otherwise it will melt.

In the case of facades, this must be assumed that with sin @ m possibly

Brand di @ @samte facade from @@@ elzen can. The F @ ssade becomes dadurc @ destroyed and can lead to the spread of edges.

De @ legislators therefore have these systems in principle for buildings from 20 m prohibited or only approved in individual cases. For higher structures are provisional Due to the risk of fire, only systems with inserts made of rock or glass wool are permitted. These h @@ en, on the other hand, have a worse @ armedämmwert, so they are only in @ i @ keren To address layers again as Vollwar @@@ chutz.

The inventive facade plaster is not responsible for this. The individual products of the Auf @ aus of the thermally insulating Fass @d @ nputzes are with their Especially @ naft are all known for themselves on the market and come to the in a variety of ways Mission. The combination of the different materials but in the invention Kind of put together, result in a simple way of a heat-insulating incombustible Facade protection that fully meets the requirements of the term full thermal insulation.

Polyurethane of the type "flame retardant" is used as a thermal insulation layer or "fire retardant". The polyurethane thermal insulation layers are either direct Appropriately in a multi-component spraying system on the masonry to be protected sprayed on using an adhesion promoter and foamed or as foamed / extruded Material in sheet form glued to the masonry with an adhesive. as Adhesive is used here using adhesion promoters (polymethacrylates) of the below @ plaster described has been used. An adhesion promoter is then applied to this polyurethane layer (Polymethacrylate) sprayed on to create a bond between the plastic layer and to improve the subsequent layer of plaster.

A plaster layer up to 25 mm thick is then expediently applied a mineral plaster applied either by machine or by hand. The plaster should reduce subsequent weather-related thermal occurrences Tensions with fillers, such as Bl'e.htor (Perlite), plastic or mineral Fibers, etc., so as to prevent cracks from occurring. That too spec. The weight of the plaster should not be too high and should be less than 1. Also should the plaster expediently be a so-called mineral single layer plaster, especially with Application to be able to work in one step if possible. Of course this plaster should also be structurable.

This plaster is laid on a case-by-case basis, in the case of butes over 10 m total height Always use sheets of glass fabric for mechanical reinforcement of the facades. The inventive Structure of the heat-insulating facade plaster represents a rel. simple and cheap System represents a non-flammable full thermal protection.

This non-combustibility is due to 1. Non-combustibility of the mineral wall former and 2. the mineral exterior plaster of up to 25 mm Thickness.

The heat-insulating foam insulation, which in itself is very flame-retardant made of polyurethane cannot burn because there is no access to oxygen. Self when the mineral external plaster is broken out, in extreme cases (welding torch temperatures approx. 1100 to 1200 ° C) only small charring without significant smoke development was observed. Small errors of this kind can be easily repaired. The foamed polyurethane melts In addition, in contrast to polystyrene, it does not when heated, but essentially retains its for # stability.

Further advantages of the facade plaster according to the invention are e.g. mechanical strength, compressive strength and the ability to diffuse water vapor. Here, the male exterior plaster is particularly noticeable compared to the previous ones Superstructures made with plastic plaster. The water vapor diffusivity decreases here in accordance with the building physics knowledge for the entire wall, inside out. For systems with polystyrene / dispersion adhesive / plastic plaster sometimes the dreaded "water accumulation" occurs in the insulating layer. This reduces the function of the insulating layer.

Another major advantage is its extremely low level Thermal conductivity of the flame-retardant polyurethane, # = 0.020 kcal / mh 00. With the combination described, it is easily possible to use the heat-insulating one Keep the layer approx. 30% thinner than polystyrene in order to achieve the same thermal insulation value to reach.

The great dimensional stability of the polyurethane compared to the polystyrene is also of great advantage. The linear displacement between 20000 and + 150 ° C is not more than 2%.

Claims (1)

Pantent claims: Thermally insulating facade plaster with 2 to 3 times Factor according to DIN 4108 as full thermal protection characterized in that the thermal insulation Layer of fire retardant foam insulation made of polyurethane that both foamed directly onto the mural using an adhesion promoter as is also glued indirectly in plate form, then with an adhesion promoter is treated and coated with a mineral plaster up to 25 mm thick, glass fabric is used as reinforcement and this structure in its entirety results in a non-flammable full thermal protection. 2. that as an adhesion promoter essentially Polymel-hacrylate be used. -3. that the mineral plaster expanded clay and / or mineral or plastic fibers can contain and is very low-tension. 4. that in the mineral plaster of higher structures glass fabric for reinforcement is embedded 5. that a so-called structurable single layer plaster is used as plaster 6. that the application of the polyurethane with multi-component injection units is used he follows.