Surfactant composition for gypsum plaster boards
AssigneeLafarge Platres
InventorsDaniel Martin, Robert Garcin, Serge Sabio
Life of this patent
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Abstract
The invention concerns a gypsum plaster composition, including alkylsuphates of formula H(CH2)nOSO−M+, wherein: n is from 6 to 16 and the average number of carbon atoms in the alkylsulphate composition nm ranges between 10 and 11, and M is a monovalent cation. The invention also concerns a method for preparing the plaster composition and a gypsum plaster board obtainable from said composition. The invention further concerns a method for making gypsum plaster boards. The invention is useful for producing lightened gypsum plaster boards.
Claims14
Gypsum composition comprising, in combination with gypsum and water, a surfactant composition comprising alkyl sulfates of formula H(CH2)nOSO3−M+,
- in which n is from 6 to 16, the mean number of carbon atoms in the alkyl sulfate composition nm being between 10 and 11, and M is a monovalent cation.
Process for the manufacture of a gypsum composition according to one of the preceding claims, is comprising the stages of:
- preparing a gypsum slurry from gypsum and water;
- forming a foam from a surfactant composition comprising alkyl sulfates of the formula H(CH2)nOSO3−M+,
- in which n is a number between 6 and 16, the mean number of carbon atoms in the alkyl sulfate composition nm being between 10 and 11, and M is a monovalent cation, and water;
- and
- mixing the gypsum slurry and the surfactant foam.
Process for the manufacture of gypsum boards, comprising the stages of:
- preparing a gypsum slurry from gypsum and water;
- forming a foam from a surfactant composition comprising alkyl sulfates of formula H(CH2)nOSO3−M30 ,
- in which n is a number between 6 and 16, the mean number of carbon atoms in the alkyl sulfate composition nm being between 10 and 11, and M is a monovalent cation, and water;
- and
- mixing the gypsum slurry and the surfactant foam;
- pouring the gypsum composition between two layers of external material;
- drying the gypsum board.
Dependencies are inferred from the claim text.