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Description

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.



In this specification, terms like humidified or saturated vapor mean the relative humidity of the environment at or near 100%.



One 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.



Main 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.



The 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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