Magnesium aluminum silicate is often used as a thickener, but also a good emulsion stabilizer and suspending agent. The combination of organic gum and magnesium aluminum silicate can bring out the best characteristics of both, which can be used for the bonding of different powders (talc, pigments and pharmaceuticals), and is a disintegrating agent for tablets. Magnesium aluminum silicate is a hydrophilic colloid, and has pseudo-plasticity and fluidity, it is the viscosity improver and thickener of cream, lotion shampoo, hair care products, it can suspend and disperse the powdered pigment to make the product get the best color, fine and smooth organization. Used as a thickener for toothpaste, it can be used together with CMC, which can improve the thixotropy and dispersibility of toothpaste.
Magnesium aluminum silicate can also be effectively used in pharmaceuticals, can control the pouring properties of oral suspensions and emulsions, which helps to get a uniform dose of the product. It is also used in tablet production. In metal and automotive polishes, tile and glass cleaners to suspend friction agents therein and stabilize emulsions. Used in white shoe polish to suspend pigments to prevent product hardening. Used in toothpaste, it has good compatibility with natural and synthetic gums and can improve the structure of strips.
203 g of crystalline magnesium chloride such as is used as a food additive,
containing 46% MgCl2, is dissolved in 600 ml of water, to which 96 g of
caustic soda dissolved in 250 ml of water is added with stirring and a solution
comprising 50 ml of water with 207 g of sodium silicate (Na2O, 9%, SiO2,
29%) is further added and is then vigorously stirred to produce basic sodium
magnesium silicate (which is designated as Slurry A).
Secondly 593 g of aluminum sulfate containing 17.2% Al2O3, dissolved in
1,700 ml of water is gently added with stirring to 216 g of caustic soda
dissolved in 600 ml of water, to which 50 ml of water added to 207 g of
sodium silicate (Na2O 9%, SiO2, 29%) is slowly added and is then vigorously
stirred to produce tetrabasic dialuminum silicate (which is designated as
Slurry B). Slurry A and Slurry B are mixed up vigorously with stirring for 3
hours at room temperature. The thus obtained white gel-like precipitate is
washed by decantation to remove free alkali, sodium sulfate, sodium chloride,
etc. produced as reaction by-products. The residue is filtered and dried at
105°-110°C and 340 g of white powder of fine particle size is obtained as the
final product. The molar ratio of MgO to Al2O3, to SiO2, in this product is
approximately 1: 1: 2.
203 g of crystalline magnesium chloride such as is used as a food additive,
containing 46% MgCl2, and 593 g of aluminum sulfate containing 17.2%
Al2O3, are dissolved in 2,300 ml of water, to which a solution comprising 272
g of caustic soda with 800 ml of water, is slowly added with stirring.
Thereafter, a solution comprising 414 g of sodium silicate (Na2O, 9%, SiO2,
29%) with 100 ml of water is added, the mixture is heated and is stirred for
five hours, while keeping the temperature at 60°C. When the reaction mixture
becomes neutral it is allowed to cool and to stand, the supernatant fluid is
withdrawn and the white gel-like precipitate is washed by decantation to
remove the impurities and dried at 105°-110°C and 350 g of white powder of
fine particle size is obtained as the final product (almasilate).
