Study On Preparation And Properties Of Architectural Ceramic Compound Dispersant

In the industrial of architectural ceramics, the quality and efficiency of ceramicswas enhanced by adding dispersant to the slurry. Ceramic dispersant can also reducethe required water content in the ceramic slurry, and decrease energy consumption. Atpresent, inorganic dispersant is broadly used, but it does not have excellent effects onstability of ceramic slurry and grinding. Polymer dispersant can meet the requirementof ceramic slurry with high performance, but the cost is high. The aim of the thesiswas to get dispersants with good dispersion and low cost by blending inorganic andpolymer dispersants.We choose four dispersants (sodium tripolyphosphate, six partial sodiumphosphate, sodium polyacrylate and (TH-204) out of11dispersants by analyzing theireffects on flow time, thickening degree, dispersion of ceramic slurry. Then weinvestigated the properties of ceramic slurry by blending the four different dispersants,and optimizing the blending ratios. Meanwhile, the dispersion mechanism of blendingdispersants was studied according to the results of SEM and TEM.The results show that the property of dispersant wasn’t excellent when they wereused individually. For example, by adding0.4%six partial sodium phosphate, thefluidity of ceramic slurry was36s, but the thickening degree is1.17, on whichcondition, it is difficult to mould and process. Compared with single dispersant, thecompound dispersant has advantages in fluidity with low water contents. The optimalblending ratio of sodium tripolyphosphate, six partial sodium phosphate, sodiumpolyacrylate and TH-204is5:4:5:6, the best composite dispersion agent dosage is0.6%, the flowing time is36s and the thickening degree is1.89. Meanwhile, theblending dispersants can improve the plasticity of ceremic slurry. For example, theplasticity degree of ceramic slurry was0.43by adding0.4%the compound dispersant.The flexural strength of ceramic body was1.35MPa and28.3MPa, respectively,before and after sintering by adding0.6%blending dispersants. The results of SEMshowed that flocculating constituent was destroyed after the addition of compounddispersant. The average size of particle was10μm and the surface of the particle wassmooth without adhering flaky grain after adding the compound dispersant, i.e. thecompound dispersant has a good dispersing effect.