Currently in building ceramic body used in the formulation additives are mainly two.
one is body enhancer , mainly used to increase the strength of the body , is mainly used in low viscosity carboxymethylcellulose is CMC; a coagulant solution species are primarily used to reduce the viscosity of the mud , reducing the moisture content of the mud to reduce the spray drying tower granulation step water slurry fuel consumption , is used in ceramic manufacturers coagulant solution of sodium silicate and the three main sodium tripolyphosphate.
Lignosulfonate and organic additives is added to the formulation is beneficial to reduce the mud flow , and because it has some adhesive properties, can achieve the purpose of increasing green strength .
Lignosulfonate and organic additives are not long molecular chain Lignosulfonate can be dissolved in water , Na + ions ionized and lignin sulfonate ion , lignin sulfonate ions and adsorption on the surface of the raw material particles from the reaction of Ca2 + Ca- lignin , dissolved in water Na + instead of Ca2 + adsorbed on the surface of raw material particles , adsorbed on the particle surface portion of bound water is released, the slurry thus increased mobility . Also instead of Na + Ca2 + adsorbed on the surface of the raw material grains ξ- potential of the particles increases , the repulsive force between the particles increases, face to face with the formation of particles , the slurry to increase the number of free water , the slurry will be increased mobility .
Function Sodium lignosulfonate added in an amount as increasing the strength of the body is constantly increasing .
adding green strength 20,30,40 kilograms were 0.90MPa, 0.98MPa, 1 .06 MPa, lignin sulfonate described reinforcing effect of the body and is obviously advantageous to reduce the flow rate of the mud , can be used to increase the strength of the body .