Plasticizer in the application of porcelain blanks Analysis

Foreword and other ceramic products, porcelain products make the edge of the child because of its structure and the different processes, the plasticity of the blank can be demanding. With the porcelain industry in China's rapid development, the industry has been in use for high plasticity clay increasingly scarce raw materials, however, the development of power transmission, the insulation of electrical porcelain child's increasingly high performance requirements, the product structure is more complex, its molding process process on the blank plasticity of clay materials are increasingly high requirements, relying on the clay materials can not meet the manufacturing process on the blank plasticity request. Therefore, finding a high plasticity clay in the case of declining raw material increased plasticity method blank porcelain workers has become an urgent task. Dextrin used in the ceramic blank, CMC, PVA and other adhesives can increase the plasticity of mud body strength and progress, but there is an effective role in a short time, there will be some left after burning residual ash or pores, affecting porcelain electrical properties and mechanical properties of materials defects. Since 1994, the author on how to progress a lot plasticity blank test, the ultimate porcelain blank by adding plasticizers 1303, the plasticity of the blank has been progress, product inspection pass rate also billet rise. In this paper, the effect of this blank plasticizers and its application for the first volume. impact modifier
Plasticizers exist between clay particles due to their van der Waals, electrostatic attraction and local edge side of the capillary force of suction and plasticity. This capillary force turned around three forces, mainly in the plastic range of the water content, the heap together form a water film on the particle surface, the surface tension of the water under the action firmly attracted to the sludge material has good plasticity. The external force, the dislocation between layers of clay particles, until the water film breaks, cracked mud when the size of the external force can be expressed mud plasticity merits. By a layer of bentonite (SiO4) tetrahedron layers (AlO8) octahedra, has a strong affinity for water, water resulting from the expansion, damage to the structure layers, the particles are dispersed into very fine particles, which has a strong plasticity. However, the water absorption capacity of bentonite is too strong pressure filter and the ceramic body was dried slurry difficulties during sintering because the decomposition of salts tend to produce more gas to sintering tends to produce defects, also contain higher amounts of alkali metal ions such Na2O deterioration of the electrical properties of ceramic materials will, therefore, the use of the ceramic body is not too large. plasticizer
 1303 plasticizer is through the bentonite washing, grinding and other processing step process makes the clay particles are more refined, and admixtures added in two steps, first, to replace part of Na + Ca2 +, increases the binding of clay particles water, using the ratio of Ca-Na-clay high clay bound water, the second is the combination of water fully aligned. Through deep processing of bentonite, clay particles fully destroy the structure and changing clay interlayer cations adsorbed species in the plasticity of the clay water under pressure can develop within a larger amount of water released to form a continuous film of water to make mud with higher yield value, and further progress in the plasticity of bentonite. With about 1% of a plasticizer can achieve with 3% bentonite plasticizing effect.