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GYPSUM MIXTURE PERMANENTLY RESISTING DAMP

[Category : - CHEMISTRY- CONSTRUCTION HOME IMPROVEMENT]
[Viewed 1465 times]

The present invention relates to a process for the production of a thermally resistant gypsum blend for the production of plasterboards, wherein the dry component of the gypsum blend is made by mixing dry plaster with a powdered adjuvant, and then the wet component of the gypsum blend is prepared by mixing liquid chemicals and water, then mixing dry and wet ingredients thus prepared, and also relates to a gypsum plasterboard made of gypsum mixture according to the invention. rnPlasterboard sheets made of plaster and paperboards having a sandwich structure are widely used in the construction industry, as they can be used easily, quickly and simply to build partition walls or even wall elements of dry built buildings having a load bearing framework. Walls with good thermal insulation and soundproofing properties can be built of these boards by using e.g. mineral wool. rnHowever, plasterboard has the essential property of vapor-balancing, ie. absorbing high ambient humidity, and allows moisture in the ambient air for drier environments, thus controlling the humidity of the room's air space. While this property is favourable for eg. living rooms, it can be a drawback for wet rooms eg. bathrooms and kitchens, as gypsum absorbing large amount of moisture swells, the shape of the wall structure is distorted and its resistance decreases. rnTherefore, in wet rooms, especially in bathrooms and kitchens, impregnated gypsum plasterboard sheets are used, which have limited absorbent capacity.rnThus, it is an object of the present invention to provide a gypsum blend being permanently resistant the environments saturated by moisture and having moisture absorption of at most 2% on at least 40 °C in an environment of 100% relative humidity and measured by means of a standard 40 * 40 * 160 mm solid gypsum brick test body.rnOur aim is also to reduce mist absorption on the surface of gypsum brick test body as well in the event of a decrease in the environmental moisture concentration to avoid surface solubility and spreadability when continuously contacting with water or dampish environment, and standard capillary water absorption does not exceed a value of 2%, and the gypsum test body regain its original, dry mass after removed from water. rnIt is also an object of the invention to provide a plasterboard containing a gypsum mixture according to the invention, which has the advantageous properties of the gypsum mixture of the present invention even without an isolating layer well known in the prior art. rnIn this specification, terms like humidified or saturated vapor mean the relative humidity of the environment at or near 100%. rnOne of the greatest advantages of plasterboard made of saturated vapor resistant gypsum mixture according to the invention is that its thickness does not change, so it does not swell that would lead to deterioration of stability. Of course, for production of plasterboard made of saturated vapor resistant gypsum mixture according to the invention gypsum mixture is filled in between two impregnated sheets of paper, too, but this impregnation serves to protect the paper against moisture yet present in the mixture up to setting.rnMain advantage of the gypsum mixture according to the present invention is that it is permanently resistant to the environments saturated by moisture while having a moisture absorption of at most 2% on at least 40 °C in an environment of 100% relative humidity, in the event of a decrease in the environmental moisture concentration the surface solubility of the gypsum mixture also decreases, spreadability does not occur even continuously contacting with water or dampish environment, and plasterboards containing a gypsum mixture according to the invention also have those advantageous properties of the gypsum mixture according to the present invention.rnThe invention provides a process for producing of gypsum mixture permanently resistant to saturated vapor e.g. for making plasterboards, comprising the step of making dry component of a gypsum mixture by mixing dry plaster with a powdered admixture, then preparing a wet component of the gypsum blend by mixing liquid chemicals and water, and mixing the dry and wet ingredients thus prepared.

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