EP0062184B1 - Weather-proof covering for wall panels - Google Patents

Weather-proof covering for wall panels Download PDF

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Publication number
EP0062184B1
EP0062184B1 EP82102078A EP82102078A EP0062184B1 EP 0062184 B1 EP0062184 B1 EP 0062184B1 EP 82102078 A EP82102078 A EP 82102078A EP 82102078 A EP82102078 A EP 82102078A EP 0062184 B1 EP0062184 B1 EP 0062184B1
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EP
European Patent Office
Prior art keywords
covering
weatherproof
diisocyanate
diphenylmethane
covering according
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
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EP82102078A
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German (de)
French (fr)
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EP0062184A1 (en
Inventor
Hermann Dr. Gruber
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Bayer AG
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Bayer AG
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F13/00—Coverings or linings, e.g. for walls or ceilings
    • E04F13/02—Coverings or linings, e.g. for walls or ceilings of plastic materials hardening after applying, e.g. plaster

Definitions

  • the invention relates to a weatherproof covering of components, in particular lightweight components, which have free spaces at least in the outer region, the accesses from the outside of which make up more than 5% of the boundary surfaces in the cross-sectional area.
  • building materials with good thermal insulation are preferred, which can be achieved, among other things, by a large number of mostly open pores.
  • This group includes stones and slabs made of cement-bound wood wool, glass concrete or pumice, for example. These building materials are used a lot. With walls exposed to the weather, they have a serious disadvantage. They rot under the influence of moisture if they contain organic components or they are destroyed by frost and rain.
  • the surfaces are usually plastered.
  • hydraulically curing plasters are required, which are usually designed as two-layer cement or lime cement plasters, the first layer of water-repellent additives - such as. B. Stearate - contains.
  • the plastering of lightweight walls is not without problems.
  • the process is labor intensive and can only be rationalized to a certain degree.
  • a skilled craftsman is required for cleaning, who must work on the construction site in any wind and weather.
  • prefabrication of boards with mineral plaster has not proven itself, because due to the low tensile strength due to the deflection of the board, which cannot be completely avoided by transport and processing, it cracks, which can result in a reduction in quality to the point of uselessness.
  • the transport weight is increased by 5-50 kg / m 2 and the thermal insulation value is lowered, which also speaks against the use of a mineral plaster.
  • the invention is therefore based on the object of finding a weatherproof, aesthetically appealing cover for weather-affected walls or components, which has a low tightness against surface water, is economically applicable to lightweight materials with a large open pore content and in prefabricated components in addition to a high surface quality has sufficient elasticity against accidental deformation during processing.
  • the object is achieved in that for the waterproof thickening of the outer area is provided with a polyurethane mass increasing in volume by 30 to 300% during curing.
  • the free spaces have undercuts.
  • undercut free spaces can consist of production-related pores, partially covered cavities or subsequently created recesses such as undercut bores or grooves.
  • the required anchoring depth results from the thermal and mechanical stress depending on the materials.
  • the cover has an embossing that took place before the final hardening.
  • An embossing device makes it possible to design the surface of the component in order to achieve a special effect on the finished component.
  • the cover is provided with mineral granules before the final hardening.
  • the aesthetic appearance of the component can be significantly improved.
  • the cover contains fire-retardant additives.
  • the fire risk is reduced by the fire retardant additives.
  • polyurethane compositions to be used for the production of the covers according to the invention represent one-component or two-component systems known per se in polyurethane chemistry.
  • reaction products of any organic polyisocyanates with inferior amounts of compounds having hydrogen atoms which are reactive toward isocyanate groups in an equivalent ratio of isocyanate groups to isocyanate-reactive groups of 1.5: 1 to 15: 1 or using one more are particularly suitable according to the invention Larger excess of polyisocyanate, which excess can optionally be removed after the preparation of the prepolymers, for example by thin-layer distillation.
  • organic polyisocyanates with compounds having groups which are reactive toward isocyanate groups are used in an equivalent ratio of approximately 0.8: 1 to 1.2: 1.
  • the reaction components are mixed shortly before they are used.
  • the curing then takes place through the isocyanate addition reaction which occurs spontaneously between the isocyanate groups and the groups which are reactive toward isocyanate groups.
  • the NCO prepolymers are used, they are preferably cured by reaction with water contained in the substrate.
  • All polyisocyanates of polyurethane chemistry can be used both for the preparation of the NCO prepolymers and as a reaction component in the two-component systems, such as, for. B. hexamethylene diisocyanate, 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane, 2,4- and 2,6-tolylene diisocyanate and any mixtures of these isomers, 4,4'-diphenylmethane diisocyanate and 4,4'-dicyclohexylmethane diisocyanate.
  • Biurets, uretdiones, trimerizates and other reaction products of the monomeric polyisocyanates mentioned can also be used.
  • any compounds which are at least difunctional in the sense of the isocyanate addition reaction and have hydrogen atoms which are reactive toward isocyanate groups can be used.
  • polyether polyols known in polyurethane chemistry, such as those obtained by polymerization, copolymerization or block copolymerization of alkylene oxides, such as ethylene oxide, and / or propylene oxide using di- or polyfunctional active hydrogen atoms, such as, for. B. water, ammonia, ethylenediamine, ethylene glycol, trimethylolpropane, glycerol, pentaerythritol, sorbitol, phosphorous acid and phosphonic acids can be obtained.
  • Polyacetals such as, for. B. the polycondensation products of formaldehyde and diols or polyols of the type mentioned above, as can be obtained using acidic catalysts.
  • Preferred polyisocyanates for the preparation of the prepolymers are 4,4'-diphenylmethane diisocyanate or isomer mixtures of 4,4'- and 2,4'-diphenylmethane diisocyanate.
  • Particularly suitable polyisocyanate mixtures consist of a) 0-5% 2,2'-diisocyanate diphenylmethane, b) 20-80, preferably 30-70% 2,4'-diisocyanatodiphenylmethane and c) 80-20, preferably 70-30% 4, 4'-diisocyanatodiphenylmethane and / or higher than difunctional polyisocyanates of the diphenylmethane series.
  • This preferred polyisocyanate mixture has a viscosity of less than 200 cp at 20 ° C.
  • the particular advantage of the preferred polyisocyanate mixture is due to the fact that it can be used to produce solvent-free fillers that do not have any troublesome crystallization phenomena.
  • reaction products containing free isocyanate groups are prepared in a manner known per se by reacting the components in the proportions mentioned at 15-100 ° C., preferably 20-50 ° C.
  • the reaction products thus obtained generally have a viscosity of between 1,000 and 10,000 mpa.s at 20 ° C.
  • the fillers used in the process according to the invention generally contain 20-100% by weight, preferably 30-60%, of the reaction products mentioned.
  • the fillers can contain auxiliaries and additives.
  • auxiliaries and additives are, for example, catalysts used in polyurethane chemistry, such as. B. tertiary amines or organic metal compounds, plasticizers, especially those that are characterized by resistance to the alkaline components of the structures, such as. B. phosphoric acid esters, and reaction products of chlorosulfonated paraffins with phenol and phenol derivatives, pigments in powder form or as pastes, inorganic fillers, such as. B. sand, kaolin, chalk, barium sulfate, silicon dioxide, emulsifiers, flame retardants, anti-aging agents or adhesion promoters.
  • catalysts used in polyurethane chemistry such as. B. tertiary amines or organic metal compounds
  • plasticizers especially those that are characterized by resistance to the alkaline components of the structures, such as. B. phosphoric acid esters, and reaction products of chlorosulfonated paraffins
  • polyether polysiloxanes known from polyurethane foam chemistry can also be used to stabilize the foam structures resulting from the formation of carbon dioxide.
  • the fillers to be used in the method according to the invention are essentially solvent-free systems, the use of solvents is also included tel such as B. ethyl acetate, butyl acetate or xylene cannot be excluded in principle.
  • the usual inorganic adjusting agents such as B. highly disperse silicas or asbestos fibers can be used.
  • the use of chemically reactive thickeners is particularly preferred for the process according to the invention.
  • the preferred diisocyanates based on 4,4'-diphenylmethane diisocyanate or isomer mixtures with 2,4'-diphenylmethane diisocyanate the addition of up to 4% of diethyltoluenediamine or other sterically hindered aromatic diamines through chemical reaction with the isocyanate groups turns a pasty Consistency achieved.
  • Mixtures of isomers which contain at least 20% of the 2,4-diphenylmethane diisocyanate show a surprisingly favorable low viscosity for processing.
  • the leveling compound is applied in an amount of 250 to 5,000 g per square meter to the pre-wetted surface of the lightweight component using hand tools or, in the case of prefabrication, using machine application equipment.
  • mineral granules are distributed in a thin layer on the leveled surface or embossed.
  • a reaction takes place within 5-30 minutes with elimination of C0 2 7, which leads to hardening of the leveling compound with inflation within 1-3 hours.
  • the rate of hardening can be increased by spraying with water or by adding water vapor. After curing, it is possible to paint with emulsion paints or dyes containing solvents.
  • 1,000 g of polyalkylene oxide polyether based on trimethylolpropane and propylene oxide (molecular weight approx. 600) are mixed with 20 g of polyalkylene oxide-polysiloxane copolymer as a stabilizer, 100 g of amorphous silica and 3000 g of quartz sand (grain size 0.2 mm).
  • the two components are mixed and applied before processing.
  • the processing time is 20 'and the material consumption per m 2 of coated plate is 2.75 kg.
  • the freshly cured coating is sprinkled with quartz chips (0-2 mm) when fresh.
  • a construction panel is formed with a light-fast, tough and resilient, durable top f lächenstruk- structure containing a further decorative component by the bound mineral Einstreugut.
  • Example 1 900 g of a technical isomer mixture of diphenylmethane diisocyanate with a viscosity of 180 mPa / sec. and an NCO content of 31.5%. After mixing with component A from Example 1, the procedure is as in Example 1. The processing time is 40 minutes. After curing, a plaster-like, decorative, closed surface is obtained, which is protected from harmful light and weather influences by painting with commercially available emulsion paint. The panels produced in the manner described are suitable for facades, walls and as ceiling panels.
  • the moisture contained in the subsurface triggers a hardening reaction of the filler compound, which is completed in about 3 hours at 23 ° C.
  • the end product is a decorative component with a tough, elastic, impact-resistant and water-resistant coating.
  • the material consumption is 2.0 kg / m 2.
  • the coating is cured in a chamber that is saturated with hot water vapor.
  • the coating has hardened to such an extent that, after a further 20 minutes of cooling at 23 ° C., painting with a dispersion paint based on an acrylate-styrene copolymer can be carried out.
  • the following example describes the coating of a board made of cement-bound pumice building material.
  • An embossing stamp is placed on the freshly applied coating compound, which, after the structured surface coating has hardened, reveals the joint pattern of a masonry bond.
  • the coated pumice building board is cut in the form of clinker and bricked up as a heat-insulating veneer.
  • the thixotropic prepolymer containing isocyanate groups and composed in accordance with Example 3 is mixed with the same amount of aluminum oxyhydrate and leveled on the surface of a foam concrete slab wetted with water.
  • the cost of materials was 1,100 g / m 2 .
  • the hardening reaction which increases in volume, begins after about 10 minutes and is completed after about 5 hours. The volume increase is 285% in the area of the foam concrete pores and 30% in the area of the webs.
  • the surface of the coating is structured, but non-porous.
  • a Carstens water penetration test is carried out (Warmth and Moisture, Berlin 1960, Verlag Ernst, p. 30). After a test period of 3 days, water absorption is not discernible.
  • the fire test according to DIN 4102 shows fire class B 1 - flame retardant.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Polyurethanes Or Polyureas (AREA)
  • Laminated Bodies (AREA)
  • Aftertreatments Of Artificial And Natural Stones (AREA)
  • Building Environments (AREA)

Description

Die Erfindung betrifft eine wetterfeste Abdeckung von Bauelementen, insbesondere Leichtbauelementen, die mindestens im Außenbereich Freiräume besitzen, deren Zugänge von außen in der Querschnittsfläche mehr als 5 % der Begrenzungsflächen ausmachen.The invention relates to a weatherproof covering of components, in particular lightweight components, which have free spaces at least in the outer region, the accesses from the outside of which make up more than 5% of the boundary surfaces in the cross-sectional area.

Für Fassaden und Außenwände werden Baustoffe mit guter Wärmedämmung bevorzugt, die unter anderem durch eine Vielzahl meist offener Poren erreicht werden kann. Zu diese Gruppe gehören Steine und Platten beispielsweise aus zementgebundener Holzwolle, Glasbeton oder Bims. Diese Baustoffe werden viel eingesetzt. Bei witterungsbeaufschlagten Wänden haben sie einen schwerwiegenden Nachteil. Sie verrotten nämlich unter dem Einfluß von Feuchtigkeit, wenn sie organische Bestandteile enthalten oder sie werden durch Frost und Regen zerstört.For facades and exterior walls, building materials with good thermal insulation are preferred, which can be achieved, among other things, by a large number of mostly open pores. This group includes stones and slabs made of cement-bound wood wool, glass concrete or pumice, for example. These building materials are used a lot. With walls exposed to the weather, they have a serious disadvantage. They rot under the influence of moisture if they contain organic components or they are destroyed by frost and rain.

Um solche Schäden zu vermeiden werden üblicherweise die Oberflächen verputzt. Für Außenwände sind hydraulisch härtende Putze erforderlich, die meist als zweischichtige Zement- bzw. Kalkzementputze ausgeführt werden, wobei die erste Schicht wasserabweisende Zuschlagstoffe - wie z. B. Stearate - enthält.To avoid such damage, the surfaces are usually plastered. For external walls, hydraulically curing plasters are required, which are usually designed as two-layer cement or lime cement plasters, the first layer of water-repellent additives - such as. B. Stearate - contains.

Das Verputzen von Leichtbauwänden ist nicht ohne Problematik. Der Arbeitsvorgang ist arbeitsaufwendig und läßt sich nur bis zu einem gewissen Grade rationalisieren. Für das Putzen ist ein geübter Handwerker erforderlich, der bei jedem Wind und Wetter auf der Baustelle arbeiten muß. Denn eine Vorfabrikation von Platten mit mineralischem Putz hat sich nicht bewährt, da dieser infolge der geringen Zugfestigkeit bei der durch Transport und Verarbeitung nicht ganz vermeidbaren Durchbiegung der Platte Risse bekommt, die eine Qualitätsminderung bis zur Unbrauchbarkeit zur Folge haben können. Im Übrigen wird das Transportgewicht um 5-50 kg/m2 erhöht und der Wärmedämmwert erniedrigt, was auch gegen die Verwendung eines mineralischen Putzes spricht.The plastering of lightweight walls is not without problems. The process is labor intensive and can only be rationalized to a certain degree. A skilled craftsman is required for cleaning, who must work on the construction site in any wind and weather. Because prefabrication of boards with mineral plaster has not proven itself, because due to the low tensile strength due to the deflection of the board, which cannot be completely avoided by transport and processing, it cracks, which can result in a reduction in quality to the point of uselessness. Incidentally, the transport weight is increased by 5-50 kg / m 2 and the thermal insulation value is lowered, which also speaks against the use of a mineral plaster.

Weiter sind Versuche bekannt, kunstharzgebundene Putze für Leichtbauplatten einzusetzen.Attempts are also known to use synthetic resin-bound plasters for lightweight building boards.

Durch die Grobporigkeit der meisten Leichtbaustoffe ist der Bedarf an Kunstharzputz sehr groß, wodurch ein wirtschaftlicher Einsatz nicht mehr gegeben ist.Due to the coarse pores of most lightweight building materials, the need for synthetic resin plaster is very high, which means that they are no longer economically viable.

Der Erfindung liegt daher die Aufgabe zugrunde eine wetterfeste, ästhetisch ansprechbare Abdeckung von wetterbeaufschlagten Wänden bzw. Bauelementen zu finden, die bei geringem Gewicht eine hohe Dichtigkeit gegen Oberflächenwasser aufweist, auf Leichtbaustoffen mit großen offenem Porenanteil wirtschaftlich anwendbar ist und bei vorgefertigten Bauelementen neben einer hohen Oberflächengüte genügend Elastizität bei unbeabsichtigter Verformung während der Verarbeitung aufweist.The invention is therefore based on the object of finding a weatherproof, aesthetically appealing cover for weather-affected walls or components, which has a low tightness against surface water, is economically applicable to lightweight materials with a large open pore content and in prefabricated components in addition to a high surface quality has sufficient elasticity against accidental deformation during processing.

Die Aufgabe wird erfindungsgemäß dadurch gelöst, daß zur wasserdichten Abdickung der Außenbereich mit einer während der Aushärtung im Volumen um 30 bis 300 % zunehmenden Polyurethanmasse versehen ist.The object is achieved in that for the waterproof thickening of the outer area is provided with a polyurethane mass increasing in volume by 30 to 300% during curing.

Für den Fachmann ist es überraschend, daß durch das Eindringen der Polyurethanmasse in die von außen zugängigen Freiräume des Au- ßenbereiches vom Bauelement mit anschließender Volumenvergrößerung von 30-300 %, vorzugsweise von 100-200 %, eine intensive Verbindung mit dem Leichtbauelement entsteht, so daß schon eine Abdeckung von geringer Dicke, die gerade ausreichend für die Abdichtung gegen Oberflächenwasser ist, nicht mehr abplatzt. Die notwendige offene Fläche der Freiräume von mehr als 5 %, vorzugsweise von 10-30 %, der projezierten Abdeckung entsteht meistens schon bei der Fertigung der Leichtbauplatten. Es ist aber auch möglich, entsprechende Nuten oder Bohrungen nachträglich anzubringen. Die dünne Schicht kann beispielsweise durch einen Spachtel in geringer Stärke direkt auf das Bauelement aufgezogen werden und erhält ihre endgültige Dicke erst nach der Volumenvergrößerung. Der Materialverbrauch ist gering. Leichtbauplatten auch großer Dimensionen können schon im Werk beschichtet werden, da sie wegen ihrer schlagfesten Oberfläche und geringen Bruchempfindlichkeit auch während des Transportes ihre Qualität beibehalten. Ebenfalls ermöglichen die hervorragenden Materialeigenschaften ohne Quaiitätseinbuße die weitere Verarbeitung an der Baustelle.It is surprising for the person skilled in the art that the penetration of the polyurethane mass into the externally accessible open spaces of the exterior of the component with subsequent volume increase of 30-300%, preferably 100-200%, results in an intensive connection with the lightweight component that even a cover of small thickness, which is just sufficient for sealing against surface water, no longer flakes off. The necessary open area of the free spaces of more than 5%, preferably 10-30%, of the projected cover mostly arises during the manufacture of the lightweight panels. However, it is also possible to retrofit corresponding grooves or bores. The thin layer can, for example, be applied directly to the component with a thin spatula and only gets its final thickness after the volume has been increased. The material consumption is low. Lightweight construction boards, even of large dimensions, can be coated in the factory, because their impact-resistant surface and low sensitivity to breakage keep their quality even during transport. The excellent material properties also allow further processing at the construction site without sacrificing quality.

In einer besonderen Ausführungsform weisen die Freiräume Hinterschneidungen auf.In a special embodiment, the free spaces have undercuts.

Bei Freiräumen mit Hinterschneidungen verkeilt sich die von der Oberfläche eingedrungene Polyurethanmasse nach der Volumenvergrößerung und hält die dünne Abdeckung fest. Dabei können diese hinterschnittenen Freiräume aus fertigungsbedingten Poren, teilweise abgedeckten Hohlräumen oder nachträglich erzeugten Ausnehmungen wie hinterschnittene Bohrungen oder Nuten bestehen. Die notwendige Verankerungstiefe ergibt sich aus der wärmebedingten und mechanischen Beanspruchung in Abhängigkeit von den Materialien.In open spaces with undercuts, the polyurethane mass penetrated from the surface wedges after the volume has been increased and holds the thin cover in place. These undercut free spaces can consist of production-related pores, partially covered cavities or subsequently created recesses such as undercut bores or grooves. The required anchoring depth results from the thermal and mechanical stress depending on the materials.

In einer weiteren Ausführungsform besitzt die Abdeckung eine vor der entgültigen Aushärtung erfolgte Prägung.In a further embodiment, the cover has an embossing that took place before the final hardening.

Durch eine Prägevorrichtung ist es möglich, die Oberfläche des Bauelements zu gestalten, um am fertigen Bauteil einen besonderen Effekt zu erzielen.An embossing device makes it possible to design the surface of the component in order to achieve a special effect on the finished component.

In einer anderen Ausführungsform ist die Abdeckung vor der endgültigen Aushärtung mit mineralischem Granulat versehen.In another embodiment, the cover is provided with mineral granules before the final hardening.

Durch das Abstreuen der Abdeckung vor der Aushärtung mit mineralischem Granulat kann das ästhetische Aussehen des Bauelements wesentlich verbessert werden.By sprinkling the cover with mineral granules before curing, the aesthetic appearance of the component can be significantly improved.

In einer möglichen Ausführungsform enthält die Abdeckung feuerhemmende Zuschlagstoffe.In one possible embodiment, the cover contains fire-retardant additives.

Durch die feuerhemmenden Zuschlagstoffe wird die Brandgefahr herabgesetzt.The fire risk is reduced by the fire retardant additives.

Die zur Herstellung der erfindungsgemäßen Abdeckungen einzusetzenden Polyurethanmassen stellen in der Polyurethanchemie an sich bekannte Einkomponenten- oder Zweikomponentensysteme dar.The polyurethane compositions to be used for the production of the covers according to the invention represent one-component or two-component systems known per se in polyurethane chemistry.

Im Falle der Verwendung von Einkomponentensystemen eignen sich erfindungsgemäß insbesondere Umsetzungsprodukte von beliebigen organischen Polyisocyanaten mit unterschüssigen Mengen an Verbindungen mit gegenüber Isocyanatgruppen reaktionsfähigen Wasserstoffatomen in einem Äquivalentverhältnis von Isocyanatgruppen gegenüber Isocyanat-reaktionsfähigen Gruppen von 1,5: 1 bis 15: 1 oder unter Verwendung eines noch größeren Überschusses an Polyisocyanat, welcher Überschuß gegebenenfalls im Anschluß an die Herstellung der Präpolymeren, beispielsweise durch Dünnschichtdestillation, entfernt werden kann.In the case of the use of one-component systems, reaction products of any organic polyisocyanates with inferior amounts of compounds having hydrogen atoms which are reactive toward isocyanate groups in an equivalent ratio of isocyanate groups to isocyanate-reactive groups of 1.5: 1 to 15: 1 or using one more are particularly suitable according to the invention Larger excess of polyisocyanate, which excess can optionally be removed after the preparation of the prepolymers, for example by thin-layer distillation.

Bei der Verwendung von Zweikomponentensystem kommen organische Polyisocyanate mit Verbindungen mit gegenüber Isocyanat- gruppen reaktionsfähigen Gruppen in einem Äquivalentverhältnis von ca. 0,8 : 1 bis 1,2 : 1 zum Einsatz. Hierbei erfolgt die Durchmischung der Reaktionskomponenten kurz vor ihrer Verwendung. Die Aushärtung erfolgt dann durch die zwischen den Isocyanatgruppen und den gegenüber Isocyanatgruppen reaktionsfähigen Gruppen spontan ablaufende Isocyanat-Additionsreaktion. Im Falle der Verwendung der NCO-Präpolymeren erfolgt deren Aushärtung vorzugsweise durch Reaktion mit im Substrat enthaltenem Wasser.When using a two-component system, organic polyisocyanates with compounds having groups which are reactive toward isocyanate groups are used in an equivalent ratio of approximately 0.8: 1 to 1.2: 1. The reaction components are mixed shortly before they are used. The curing then takes place through the isocyanate addition reaction which occurs spontaneously between the isocyanate groups and the groups which are reactive toward isocyanate groups. If the NCO prepolymers are used, they are preferably cured by reaction with water contained in the substrate.

Sowohl zur Herstellung der NCO-Präpolymeren als auch als Reaktionskomponente in den Zweikomponentensystemen können alle beliebigen Polyisocyanate der Polyurethanchemie eingesetzt werden, wie z. B. Hexamethylendiisocyanat, 1-lsocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexan, 2,4- und 2,6-Toluylendiisocyanat sowie beliebige Gemische dieser Isomeren, 4,4'-Diphenylmethandiisocyanat und 4,4'-Dicyclohexylmethandiisocyanat. Verwendbar sind ebenfalls NCO-Gruppen enthaltende Biurete, Uretdione, Trimerisate und andere Umsetzungsprodukte der genannten monomeren Polyisocyanate.All polyisocyanates of polyurethane chemistry can be used both for the preparation of the NCO prepolymers and as a reaction component in the two-component systems, such as, for. B. hexamethylene diisocyanate, 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane, 2,4- and 2,6-tolylene diisocyanate and any mixtures of these isomers, 4,4'-diphenylmethane diisocyanate and 4,4'-dicyclohexylmethane diisocyanate. Biurets, uretdiones, trimerizates and other reaction products of the monomeric polyisocyanates mentioned can also be used.

Sowohl zur Herstellung der NCO-Präpolymeren als auch als Reaktionskomponente in den Zweikomponentensystemen können beliebige, im Sinne der Isocyanat-Additionsreaktion mindestens difunktionelle Verbindungen mit gegenüber Isocyanatgruppen reaktionsfähigen Wasserstoffatomen eingesetzt werden. Vorzugsweise werden die entsprechenden Hydroxyl- oder Sulfhydrylgruppen aufweisenden Polymerisations-oder Polykondensationsprodukte mit einem Molekulargewicht von 150 bis 10 000, vorzugsweise 1 000 bis 5 000, eingesetzt. Beispiele hierfür sind die in der Polyurethanchemie bekannten Polyetherpolyole, wie sie durch Polymerisation, Copolymerisation oder Blockcopolymerisation von Alkylenoxiden, wie Ethylenoxid, und/ oder Propylenoxid unter Verwendung von di-oder polyfunktionellen aktive Wasserstoffatome aufweisenden Startermolekülen, wie z. B. Wasser, Ammoniak, Ethylendiamin, Ethylenglykol, Trimethylolpropan, Glycerin, Pentaerythrit, Sorbit, phosphorige Säure und Phosphonsäuren erhalten werden können. Geeignet sind auch Polyacetale, wie z. B. die Polykondensationsprodukte aus Formaldehyd und Diolen bzw. Polyolen der vorstehend genannten Art, wie sie unter Verwendung von sauren Katalysatoren erhalten werden können.Both for the preparation of the NCO prepolymers and as a reaction component in the two-component systems, any compounds which are at least difunctional in the sense of the isocyanate addition reaction and have hydrogen atoms which are reactive toward isocyanate groups can be used. The corresponding hydroxyl or sulfhydryl group-containing polymerization or polycondensation products having a molecular weight of 150 to 10,000, preferably 1,000 to 5,000, are preferably used. Examples of these are the polyether polyols known in polyurethane chemistry, such as those obtained by polymerization, copolymerization or block copolymerization of alkylene oxides, such as ethylene oxide, and / or propylene oxide using di- or polyfunctional active hydrogen atoms, such as, for. B. water, ammonia, ethylenediamine, ethylene glycol, trimethylolpropane, glycerol, pentaerythritol, sorbitol, phosphorous acid and phosphonic acids can be obtained. Polyacetals, such as, for. B. the polycondensation products of formaldehyde and diols or polyols of the type mentioned above, as can be obtained using acidic catalysts.

Bevorzugte Polyisocyanate zur Herstellung der Präpolymeren sind 4,4'-Diphenylmethandiisocyanat bzw. Isomerengemische von 4,4'- und 2,4'-Diphenylmethandiisocyanat. Besonders gut geeignete Polyisocyanatgemische bestehen aus a) 0-5 % 2,2'-Diisocyanatdiphenylmethan, b) 20-80, vorzugsweise 30-70 % 2,4'-Diisocyanatodiphenylmethan und c) 80-20, vorzugsweise 70-30 % 4,4'-Diisocyanatodiphenylmethan und/oder höher als difunktionellen Polyisocyanaten der Diphenylmethanreihe. Dieses bevorzugte Polyisocyanatgemisch weist bei 20 °C eine Viskosität von weniger als 200 cp auf. Der besondere vorteil der bevorzugten Polyisocyanatmischung ist darin begründet, daß sich mit ihrer Hilfe lösungsmittelfreie Spachtelmassen herstellen lassen, die keine störenden Kristallisationserscheinungen aufweisen.Preferred polyisocyanates for the preparation of the prepolymers are 4,4'-diphenylmethane diisocyanate or isomer mixtures of 4,4'- and 2,4'-diphenylmethane diisocyanate. Particularly suitable polyisocyanate mixtures consist of a) 0-5% 2,2'-diisocyanate diphenylmethane, b) 20-80, preferably 30-70% 2,4'-diisocyanatodiphenylmethane and c) 80-20, preferably 70-30% 4, 4'-diisocyanatodiphenylmethane and / or higher than difunctional polyisocyanates of the diphenylmethane series. This preferred polyisocyanate mixture has a viscosity of less than 200 cp at 20 ° C. The particular advantage of the preferred polyisocyanate mixture is due to the fact that it can be used to produce solvent-free fillers that do not have any troublesome crystallization phenomena.

Die Herstellung der freie Isocyanatgruppen aufweisenden Umsetzungsprodukte erfolgt auf an sich bekannte Weise durch Umsetzung der Komponenten in den genannten Mengenverhältnissen bei 15-100 °C, vorzugsweise 20-50 °C. Die so erhaltenen Umsetzungsprodukte weisen bei 20 °C im allgemeinen eine zwischen 1 000 und 10 000 mpa.s liegende Viskosität auf.The reaction products containing free isocyanate groups are prepared in a manner known per se by reacting the components in the proportions mentioned at 15-100 ° C., preferably 20-50 ° C. The reaction products thus obtained generally have a viscosity of between 1,000 and 10,000 mpa.s at 20 ° C.

Die beim erfindungsgemäßen Verfahren zum Einsatz gelangenden Spachtelmassen enthalten im allgemeinen 20-100 Gew.-%, vorzugsweise 30-60 % der genannten Umsetzungsprodukte.The fillers used in the process according to the invention generally contain 20-100% by weight, preferably 30-60%, of the reaction products mentioned.

Daneben können die Spachtelmassen Hilfs-und Zusatzstoffe enthalten. Es handelt sich hierbei beispielsweise um in der Polyurethanchemie gebräuchliche, Katalysatoren wie z. B. tertiäre Amine oder organische Metallverbindungen, Weichmacher, insbesondere solche, die sich durch Beständigkeit gegenüber den alkalischen Bestandteilen der Bauwerke auszeichnen, wie z. B. Phosphorsäureester, sowie Umsetzungsprodukte von chlorsulfonierten Paraffinen mit Phenol und Phenolderivaten, Pigmente in Pulverform oder als Pasten, anorganische Füllstoffe, wie z. B. Sand, Kaolin, Kreide, Bariumsulfat, Siliciumdioxid, Emulgatoren, Flammschutzmittel, Alterungsschutzmittel oder Haftvermittler. Zur Stabilisierung der durch Kohlendioxidbildung entstehenden Schaumstrukturen können auch die aus der Polyurethanschaumstoffchemie bekannten Polyetherpolysiloxane mitverwendet werden. Obwohl es sich bei den beim erfindungsgemäßen Verfahren einzusetzenden Spachtelmassen im wesentlichen um lösungsmittelfreie Systeme handelt, ist die Mitverwendung von Lösungsmittel wie z. B. Ethylacetat, Butylacetat oder Xylol nicht grundsätzlich auszuschließen.In addition, the fillers can contain auxiliaries and additives. These are, for example, catalysts used in polyurethane chemistry, such as. B. tertiary amines or organic metal compounds, plasticizers, especially those that are characterized by resistance to the alkaline components of the structures, such as. B. phosphoric acid esters, and reaction products of chlorosulfonated paraffins with phenol and phenol derivatives, pigments in powder form or as pastes, inorganic fillers, such as. B. sand, kaolin, chalk, barium sulfate, silicon dioxide, emulsifiers, flame retardants, anti-aging agents or adhesion promoters. The polyether polysiloxanes known from polyurethane foam chemistry can also be used to stabilize the foam structures resulting from the formation of carbon dioxide. Although the fillers to be used in the method according to the invention are essentially solvent-free systems, the use of solvents is also included tel such as B. ethyl acetate, butyl acetate or xylene cannot be excluded in principle.

Zur Einstellung einer pastösen Konsistenz in der Spachtelmasse können die üblichen anorganischen Stellmittel wie z. B. hochdisperse Kieselsäuren oder Asbestfasern verwendet werden. Besonders bevorzugt für das erfindungsgemäße Verfahren ist die Mitverwendung von chemischreaktiven Verdickungsmitteln. Im Falle der bevorzugt einzusetzenden Diisocyanate auf Basis 4,4'-Diphenylmethandiisocyanat bzw. lsomerengemische mit 2,4'-Diphenylmethandiisocyanat wird durch Zusatz von bis zu 4 % von Diethyltoluylendiamin oder anderen sterisch gehinderten aromatischen Diaminen durch chemische Reaktion mit den Isocyanat-Gruppen eine pastöse Konsistenz erreicht. Isomerengemische, die mindestens 20 % des 2,4-Diphenylmethandiisocyanats enthalten, zeigen eine für die Verarbeitung überraschend günstige niedrige Viskosität.To set a pasty consistency in the filler, the usual inorganic adjusting agents such. B. highly disperse silicas or asbestos fibers can be used. The use of chemically reactive thickeners is particularly preferred for the process according to the invention. In the case of the preferred diisocyanates based on 4,4'-diphenylmethane diisocyanate or isomer mixtures with 2,4'-diphenylmethane diisocyanate, the addition of up to 4% of diethyltoluenediamine or other sterically hindered aromatic diamines through chemical reaction with the isocyanate groups turns a pasty Consistency achieved. Mixtures of isomers which contain at least 20% of the 2,4-diphenylmethane diisocyanate show a surprisingly favorable low viscosity for processing.

Zur Verarbeitung der Spachtelmasse wird mit Handgeräten bzw. im Falle der Vorfertigung mit maschinellen Auftragsgeräten die Spachtelmasse in einer Menge von 250 bis 5 000 g pro Quadratmeter auf die vorgenäßte Oberfläche des Leichtbauteiles aufgetragen. In einer besonderen Ausführungsform werden nach dem Auftragen der Spachtelmasse mineralische Granulate in dünner Schicht auf der gespachtelten Oberfläche verteilt oder eine Prägung vorgenommen. Innerhalb von 5-30 Minuten erfolgt eine Reaktion unter C027Abspaltung, die innerhalb von 1-3 Stunden zur Härtung der Spachtelmasse unter Aufblähen führt. Durch Besprühen mit Wasser oder durch Zuführung von Wasserdampf kann die Härtungsgeschwindigkeit gesteigert werden. Nach der Härtung ist ein Anstrich mit Dispersionsfarben bzw. lösungsmittelhaltigen Farbstoffen möglich.To process the leveling compound, the leveling compound is applied in an amount of 250 to 5,000 g per square meter to the pre-wetted surface of the lightweight component using hand tools or, in the case of prefabrication, using machine application equipment. In a special embodiment, after application of the filler, mineral granules are distributed in a thin layer on the leveled surface or embossed. A reaction takes place within 5-30 minutes with elimination of C0 2 7, which leads to hardening of the leveling compound with inflation within 1-3 hours. The rate of hardening can be increased by spraying with water or by adding water vapor. After curing, it is possible to paint with emulsion paints or dyes containing solvents.

Beispiel 1example 1

Eine Leichtbauplatte aus zementgebundener Holzwolle, entsprechend DIN 1104, wird mit Wasser benetzt und mit einer Zweikomponenten-Beschichtungsmasse, die wie folgt zusammengesetzt ist, gespachtelt :A lightweight board made of cement-bonded wood wool, according to DIN 1104, is wetted with water and filled with a two-component coating compound, which is composed as follows:

Komponente AComponent A

1 000 g Polyalkylenoxid-Polyether auf Basis Trimethylolpropan und Propylenoxid (Molgewicht ca. 600) werden mit 20 g Polyalkylenoxid-Polysiloxan-Copolymer als Stabilisator, 100 g amorpher Kieselsäure und 3000 g Quarzsand (Körnung 0,2 mm) gemischt.1,000 g of polyalkylene oxide polyether based on trimethylolpropane and propylene oxide (molecular weight approx. 600) are mixed with 20 g of polyalkylene oxide-polysiloxane copolymer as a stabilizer, 100 g of amorphous silica and 3000 g of quartz sand (grain size 0.2 mm).

Komponente BComponent B

1 350 g eines Biuretpolyisocyanats auf der Basis Hexamethylendiisocyanat mit einem NCO-Gehalt von 21,5 Gew.-%, gelöst in 148,5 g Diphenylkresylphosphat werden mit 1,5 g Dibutylzinndilaurat als Katalysator versetzt.1,350 g of a biuret polyisocyanate based on hexamethylene diisocyanate with an NCO content of 21.5% by weight, dissolved in 148.5 g of diphenyl cresyl phosphate, are mixed with 1.5 g of dibutyltin dilaurate as a catalyst.

Die beiden Komponenten werden vor der Verarbeitung miteinander gemischt und aufgetragen. Die Verarbeitungszeit ist 20' und der Materialverbrauch pro m2 beschichtete Platte beträgt 2,75 kg. Die noch nicht ausgehärtete Beschichtung wird im frischen Zustand mit Quarzsplitt (0-2 mm) abgestreut. Nach der Aushärtung ist eine Bauplatte entstanden mit einer lichtechten, zähelastischen, strapazierfähigen Oberflächenstruk- tur, die durch das gebundene mineralische Einstreugut eine weitere dekorative Komponente enthält.The two components are mixed and applied before processing. The processing time is 20 'and the material consumption per m 2 of coated plate is 2.75 kg. The freshly cured coating is sprinkled with quartz chips (0-2 mm) when fresh. After curing, a construction panel is formed with a light-fast, tough and resilient, durable top f lächenstruk- structure containing a further decorative component by the bound mineral Einstreugut.

Beispiel 2Example 2

Anstelle der im Beispiel 1 verwendeten Komponente B werden 900 g eines technischen Isomerengemisches von Diphenylmethandiisocyanat mit einer Viskosität von 180 mPa/Sek. und einem NCO-Gehalt von 31,5 % eingesetzt. Nach der Vermischung mit der Komponente A von Beispiel 1 wird wie in Beispiel 1 verfahren. Die Verarbeitungszeit beträgt 40 Minuten. Nach der Härtung erhält man eine putzähnliche, dekorative, geschlossene Oberfläche, die durch einen Anstrich mit handelsüblicher Dispersionsfarbe von schädlichen Licht- und Wettereinflüssen geschützt wird. Die in der beschriebenen Weise hergestellten Platten sind für Fassaden, Wände und als Deckenplatten geeignet.Instead of component B used in Example 1, 900 g of a technical isomer mixture of diphenylmethane diisocyanate with a viscosity of 180 mPa / sec. and an NCO content of 31.5%. After mixing with component A from Example 1, the procedure is as in Example 1. The processing time is 40 minutes. After curing, a plaster-like, decorative, closed surface is obtained, which is protected from harmful light and weather influences by painting with commercially available emulsion paint. The panels produced in the manner described are suitable for facades, walls and as ceiling panels.

Beispiel 3Example 3

Eine Mehrschicht-Leichtbauplatte bestehend aus einem Kern von 15 mm Polystyrol-Schaum und einer Schale von jeweils 5 mm zementgebundener Holzwolle nach DIN 1104, wird mit Wasser befeuchtet und mit einer Spachtelmasse folgender Zusammensetzung beschichtet :

  • 1000 g eines Polyisocyanat-Prepolymers, hergestellt aus 100 g eines Gemisches aus 30 Gew.-% 2,4'-Diisocyanatodiphenylmethan und 70% 4,4'-Diisocyanatodiphenylmethan (NCO-Gehalt ca. 31 %) umgesetzt mit 40 g eines Polypropylenglykolethers (Molgewicht ca. 1 000) und 40 g eines Polyethers gestartet mit Ethylendiamin (Molgewicht ca. 3 700) werden mit einer Lösung von 10 g Diethyltoluylendiamin in 90 g eines Polyalkylenglykolethers gemischt. Die Mischung erstarrt innerhalb von 5 bis 10 Min. zu einem thixotropen Gel. Nach Abschluß der Gelbildung werden 2000 g Quarzsand (Körnung 0,2 mm) zugemischt. Der Materialverbrauch beträgt 1 600 g/m2.
A multilayer lightweight board consisting of a core of 15 mm polystyrene foam and a shell of 5 mm each of cement-bound wood wool according to DIN 1104 is moistened with water and coated with a filler with the following composition:
  • 1000 g of a polyisocyanate prepolymer, made from 100 g of a mixture of 30% by weight of 2,4'-diisocyanatodiphenylmethane and 70% 4,4'-diisocyanatodiphenylmethane (NCO content approx. 31%) reacted with 40 g of a polypropylene glycol ether ( Molecular weight about 1,000) and 40 g of a polyether started with ethylenediamine (molecular weight about 3,700) are mixed with a solution of 10 g of diethyltoluenediamine in 90 g of a polyalkylene glycol ether. The mixture solidifies to a thixotropic gel within 5 to 10 minutes. After the gel formation is complete, 2000 g of quartz sand (grain size 0.2 mm) are added. The material consumption is 1,600 g / m 2.

Die im Untergrund enthaltene Feuchtigkeit löst eine mit Volumenvergrößerung verbundene Härtungsreaktion der Spachtelmasse aus, die bei 23 °C in ca. 3 Stunden abgeschlossen ist.The moisture contained in the subsurface triggers a hardening reaction of the filler compound, which is completed in about 3 hours at 23 ° C.

Das Endprodukt ist ein dekorativ wirkende Bauteil mit einer zähelastischen, schlagfesten und wasserbeständigen Beschichtung.The end product is a decorative component with a tough, elastic, impact-resistant and water-resistant coating.

Beispiel 4Example 4

Eine Leichtbauplatte aus zementgebundener Holzwolle entsprechend DIN 1104, Materialstärke 20 mm, wird mit einer Spachtelmasse gemäß Beispiel 3 beschichtet.A lightweight board made of cement-bound Wood wool according to DIN 1104, material thickness 20 mm, is coated with a filler according to Example 3.

Der Materialverbrauch beträgt 2,0 kg/m2. Die Aushärtung der Beschichtung erfolgt in einer Kammer, die mit heißem Wasserdampf gesättigt ist.The material consumption is 2.0 kg / m 2. The coating is cured in a chamber that is saturated with hot water vapor.

Bereits nach 12 Min. ist die Beschichtung soweit ausgehärtet, daß nach weiteren 20 Min. Abkühlung bei 23°C ein Anstrich mit einer Dispersionsfarbe auf der Basis eines Acrylat-Styrol-Copolymerisates durchgeführt werden kann.After just 12 minutes, the coating has hardened to such an extent that, after a further 20 minutes of cooling at 23 ° C., painting with a dispersion paint based on an acrylate-styrene copolymer can be carried out.

Im Vergleich zu unbehandelten Holzwolle-Leichtbauplatten wird eine Biegezugprüfung in Anlehnung an DIN 1164 durchgeführt.

  • unbehandelt 0,81 N/mm2
  • beschichtet 1,87 N/mm2
In comparison to untreated wood wool lightweight boards, a bending tensile test based on DIN 1164 is carried out.
  • untreated 0.81 N / mm 2
  • coated 1.87 N / mm 2

Daraus ergibt sich, daß die Biegezugfestigkeit der Leichtbauplatte durch die erfindungsgemäße Abdeckung deutlich gesteigert wird.It follows that the bending tensile strength of the lightweight board is significantly increased by the cover according to the invention.

Beispiel 5Example 5

Im folgenden Beispiel soll die Beschichtung einer Platte aus zementgebundenem Bimsbaustoff beschrieben werden.The following example describes the coating of a board made of cement-bound pumice building material.

Der angefeuchtete Untergrund wird mit 2,1 kg/m2 einer Beschichtungsmasse versehen, die wie folgt zusammengesetzt ist :

  • 1 600 g eines Prepolymers auf der Basis 2,4-Toluylendiisocyanat und Polyalkylenoxid-Polyether MG 1 000, NCO-Gehalt 6,5 % Viskosität 165 000 mPa.s werden mit 400 g der 75 %igen Lösung eines Toluylendiisocyanat/Trimethylolpropan-Adduktes, NCO-Gehalt 13 %, gemischt.
The moistened substrate is provided with 2.1 kg / m 2 of a coating composition which is composed as follows:
  • 1,600 g of a prepolymer based on 2,4-tolylene diisocyanate and polyalkylene oxide polyether MG 1,000, NCO content 6.5% viscosity 165,000 mPa.s are mixed with 400 g of the 75% solution of a tolylene diisocyanate / trimethylolpropane adduct, NCO content 13%, mixed.

Es werden 2 g Dibutylzinndilaurat, 20 g Polyalkylenoxid-Polysiloxan-Copolymer und 120 g amorphe Kieselsäure sowie 1 600 g Quarzsand eingearbeitet.2 g of dibutyltin dilaurate, 20 g of polyalkylene oxide-polysiloxane copolymer and 120 g of amorphous silica and 1,600 g of quartz sand are incorporated.

Auf die frisch aufgetragene Beschichtungsmasse wird ein Prägstempel gesetzt, der nach der Aushärtung der strukturierten Oberflächenbeschichtung das Fugenbild eines Mauerwerksverbandes erkennen läßt. Die beschichtete Bimsbauplatte wird in Form von Klinkern geschnitten und als wärmedämmende Verblendschale vermauert.An embossing stamp is placed on the freshly applied coating compound, which, after the structured surface coating has hardened, reveals the joint pattern of a masonry bond. The coated pumice building board is cut in the form of clinker and bricked up as a heat-insulating veneer.

Beispiel 6Example 6

Das entsprechend Beispiel 3 zusammengesetzte thixotrope, Isocyanatgruppen enthaltende Prepolymer wird mit der gleichen Menge Aluminiumoxihydrat vermischt und auf die mit Wasser benetzte Oberfläche einer Schaumbetonplatte aufgespachtelt. Der Materialaufwand betrug 1 100 g/m2. Die Härtungsreaktion, die unter Volumenvergrößerung verläuft, beginnt nach etwa 10 Minuten und ist nach ca. 5 Stunden abgeschlossen. Im Bereich der Schaumbetonporen beträgt die Volumenvergrößerung 285 %, im Bereich der Stege 30 %. Die Oberfläche der Beschichtung ist strukturiert, aber porenfrei. Es wird eine Wassereindringprüfung nach Carstens vorgenommen (Wärme und Feuchtigkeit, Berlin 1960, Verlag Ernst, S. 30). Nach einer Prüfdauer von 3 Tagen ist eine Wasseraufnahme nicht erkennbar. Die Brandprüfung nach DIN 4102 ergibt Brandklasse B 1 - schwerentflammbar.The thixotropic prepolymer containing isocyanate groups and composed in accordance with Example 3 is mixed with the same amount of aluminum oxyhydrate and leveled on the surface of a foam concrete slab wetted with water. The cost of materials was 1,100 g / m 2 . The hardening reaction, which increases in volume, begins after about 10 minutes and is completed after about 5 hours. The volume increase is 285% in the area of the foam concrete pores and 30% in the area of the webs. The surface of the coating is structured, but non-porous. A Carstens water penetration test is carried out (Warmth and Moisture, Berlin 1960, Verlag Ernst, p. 30). After a test period of 3 days, water absorption is not discernible. The fire test according to DIN 4102 shows fire class B 1 - flame retardant.

Claims (8)

1. Weatherproof covering for building units, in particular light-weight building units, which have, at least in the outer region, empty spaces, the entrances to which from the outside have cross- sectional areas which constitute more than 5 % of the outer surfaces, characterised in that to obtain a waterproof covering the outer region is provided with a polyurethane composition which increases in volume by 30% to 300% during hardening.
2. Weatherproof covering according to Claim 1, characterised in that the empty spaces have undercuts.
3. Weatherproof covering according to Claim 1 and 2, characterised in that the covering is embossed, the embossment having been carried out before the final hardening.
4. Weatherproof covering according to Claim 1 and 2, characterised in that the covering is provided with mineral granules before the final hardening.
5. Weatherproof covering according to Claim 1-4, characterised in that the covering contains fire-retarding additives.
6. Weatherproof covering according to Claim 1-5, characterised in that the covering consists of isocyanate-group-containing prepolymers based on diphenylmethane diisocyanate and polypropylene glycol ethers.
7. Weatherproof covering according to Claim 1-5, characterised in that the covering consists of isocyanate-group-containing prepolymers obtained from isomer mixtures of diphenylmethane-4,4-diisocyanate and diphenylmethane-2,4-diisocyanate having a minimum content of 20 % of diphenylmethane-2,4-diisocyanate.
8. Weatherproof covering according to Claim 6 and 7, characterised in that the prepolymers containing isocyanate groups are in a gel-like and thixotropic state as a result of partial reaction with sterically hindered aromatic diamines.
EP82102078A 1981-03-26 1982-03-15 Weather-proof covering for wall panels Expired EP0062184B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3111958 1981-03-26
DE19813111958 DE3111958A1 (en) 1981-03-26 1981-03-26 WEATHERPROOF COVER FOR WALL ELEMENTS

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EP0062184A1 EP0062184A1 (en) 1982-10-13
EP0062184B1 true EP0062184B1 (en) 1984-12-19

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EP82102078A Expired EP0062184B1 (en) 1981-03-26 1982-03-15 Weather-proof covering for wall panels

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EP (1) EP0062184B1 (en)
JP (1) JPS57175788A (en)
DE (2) DE3111958A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1235042A1 (en) * 2001-02-14 2002-08-28 Dieter Dipl.-Ing. Mainka Facade plaster system for better use of ambient heat in heat-storing external building elements

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1071928B (en) * 1959-12-24 Anneliese Knust, geb. Zenk, Langenholzen über Alfeld/Leine Process for the production of a multilayer composite lightweight construction panel
NO125857B (en) * 1968-01-11 1972-11-13 Incentive Ab
GB1248286A (en) * 1968-01-31 1971-09-29 Fujisawa Pharmaceutical Co Method for promoting plant development
JPS529019A (en) * 1975-07-10 1977-01-24 Nippon Oils & Fats Co Ltd Repair materials for stones
JPS5213519A (en) * 1975-07-24 1977-02-01 Brother Ind Ltd Building materials consisting of natural stones
DE7808701U1 (en) * 1978-03-22 1978-08-17 Kali-Chemie Ag, 3000 Hannover BUILDING PLATE
DE7818003U1 (en) * 1978-06-16 1978-09-28 Saarpor Klaus Eckhardt Gmbh Neunkirchen Kunststoffe Kg, 6680 Neunkirchen WALL OR CEILING PANEL

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JPH0229636B2 (en) 1990-07-02
EP0062184A1 (en) 1982-10-13
DE3261581D1 (en) 1985-01-31
JPS57175788A (en) 1982-10-28
DE3111958A1 (en) 1982-10-07

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