Process for preparing jointing foam

Details Process for preparing jointing foam Process for preparing jointing foam

1996-04-25

1998-12-22

Cooney, Jr., John M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521100, 521155, C08J 902

Patent

active

058520635

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a process for preparing jointing or in-situ foam. In-situ foam is understood to be a PUR rigid foam, which is produced at the point of application, that is to say on the spot.
In the building and construction industry foams are used to seal joints, e.g. when fitting windows and doors, between the building and the part being fitted. The foams are based on polyurethane and are expanded with Frigen, a fluorinated hydrocarbon. These foams have the advantage of simple application from a spray can and in addition they correspond to the constructional and mechanical requirements of the building industry.
In practice, despite the many advantages of such foams, doubts have been raised recently. These relate in the main to the use of a fluorinated hydrocarbon as propellant, but also to the plastic polyurethane which may produce problems during waste disposal. For this reason, many architects and clients are therefore returning to old, much more time-consuming methods and are again plugging these joints with mineral wool or organic plaits, wherein the efficiency of the measures depend to a larger extent on the care and qualifications of the worker carrying out the job than was the case when using foams.
In the light of the shortly-to-be-expected ban on fluorinated hydrocarbons the development of new, harmless foam products with identical or similar properties is reasonable.
Known systems differentiate between one-component and two-component systems.
One-component systems consist of moisture-hardening pre-polymers. In contrast to two-component systems, they take longer to harden because there is a reaction with atmospheric moisture. Their main area of use is in particular to seal cavities in buildings or to fasten door frames in place.
Two-component systems consist of a polyol and a polyisocyanate. Production of the foam takes place using easily transportable foaming machines, such as e.g. pressurised containers, by the casting or injection methods.
In both cases the components which are kept under pressure as an expandable mixture are delivered via a valve. A closed or open-celled foam is produced, depending on the blowing method. Intermediate states may also be obtained. Closed-cell foams have extremely low thermal conductivities, but in contrast open-celled foams absorb sound very effectively.
The present invention is based on the object of making available a method for preparing in-situ or jointing foams in which no harmful fluorinated hydrocarbons are used as propellant. The in-situ and jointing foams prepared in an environmentally friendly manner according to the invention are not produced by organic blowing gases, in contrast to conventional methods.
Processing the jointing foam is intended to be capable of taking place in accordance with normal building practice, in small units, in order to be able to fill geometrically complicated joints easily and uniformly in all areas. The method according to the invention is intended to be capable of being performed with multi-component systems by using multi-component spray nozzles or by means of spray-guns or small compressors.
Jointing foam according to the invention is intended for use mainly wherever jointless insulation made from sheets or other moulded items can be produced only unsatisfactorily or not at all. Typical applications are the filling of cavities in a building, e.g. between door frames, in the mining industry for consolidating loose rock and for thermal insulation of domestic appliances, containers and moulded items with complex geometries, also in the petroleum industry. The jointing foams produced according to the invention are also intended to be used for the rapid and relatively simple erection of emergency accommodation. The "igloos" which are prepared should provide good thermal insulation and therefore good protection against the cold, in contrast to tents.
The qualitatively high physical and chemical properties and the price level of in-situ and jointing foams currently on the market are intended to be retained. In parti

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