DE694037C - Process for the production of masses containing gypsum - Google Patents

Description

Process for the production of gypsum-containing masses ki- new buildings and at Mending small damage in old buildings is largely used in plaster. In this case, the fired material is usually mixed with water and used Set the plaster of paris from Kristallisa.tioÜserseheinungen, d. H. let harden: There the work generally has to be carried out with a certain amount of care, d. H. require a certain amount of time to carry out the craftsmanship, this is fast Setting of the plaster is a disadvantage in such work.

Attempts have therefore been made to start the setting process by adding animal glue to slow down and actually has a certain something with this way of working Advantage achieved. However, the plaster of paris retains its known brittleness after it has set in the event of mechanical stress, be it through pressure or impact.

It has now been found that for the surface design of walls, Doors, decorations and the like delay the setting time of the plaster as desired it can be done with the plaster of paris in a dry state or in a state mixed with water in anhydrous or almost anhydrous organic solvents. insoluble, water-soluble cellulose ether added.

Furthermore, the surprising finding was made that an in anhydrous or nearly anhydrous organic solvents insoluble, water-soluble cellulose ethers containing plaster after setting a more elastic and thus against mechanical Influences largely resistant structure, creating such a plaster of paris except for the production of decorations also especially for mending damaged ones Walls and for laying electrical cables etc. by filling the cavities is usable.

The addition of the water-soluble cellulose ether to the plaster of paris can do both by mixing in dry form as well as by adding to by aqueous slurry . obtained gypsum paste.

The latter embodiment of the method allows a very strong Dilution of the Plaster of paris, there. the addition of water-soluble cellulose ethers thickens the pulp to a creamy mass, which can also be used with a brush if necessary can be processed. This also allows new plaster of paris to be used Achieve effects.

It is known in order to. Production of hard and elastic masses Plaster of paris with solutions of binding agents or materials in completely or almost anhydrous to mix organic solvents, as such binders among other things water-soluble cellulose eggiths are also intended to serve.

Apart from the fact that water-soluble cellulose ethers are as good as insoluble in completely or almost anhydrous organic solvents; whereby the known process with water-soluble cellulose ethers as binders cannot be carried out at all; the result will be. nis of the present method, namely the delay in the setting of gypsum compounds, is not achieved by the known method, since the gypsum mixes obtained after this solidify to form hard compounds after just a few minutes. Example, 0.26 parts by weight of sodium cellulose glycolate are dissolved in 5o1 of water, whereupon with this solution. z oo leg plaster of paris can be put on. The latter is thereby obtained plastically deformable for about z minutes. If one wishes to keep the plaster of paris deformable for one hour, 0.460 parts by weight * of sodium cellulose glycolate are used. When using other known water-soluble cellulose ethers, similar times result.

Claims (1)

PATEN'fANSPRUCIi: Process for the production of gypsum-containing compounds for Filling or surface design of masonry, walls, doors, decorations and the like, while extending the setting time of the plaster of paris, characterized in that the fired plaster of paris in a dry state or in a state mixed with water in an anhydrous state or almost anhydrous organic solvents insoluble, water-soluble Ccllulose ether added.