LUBRICANT FOR CERAMIC EXTRUSION MOLDING, GREEN BODY COMPOSITION FOR CERAMIC EXTRUSION MOLDING, CERAMIC MOLDED ARTICLE, AND METHOD FOR PRODUCING CERAMIC MOLDED ARTICLE

摘要

The purpose of the present invention is to provide a lubricant for ceramic extrusion molding, which makes it possible to produce a ceramic extrusion-molded article having excellent lubricity, surface smoothness and shape-retaining properties when the lubricant is used in the molding of the ceramic extrusion-molded article and enables the reduction of cracking of the ceramic extrusion-molded article during the drying of the ceramic extrusion-molded article.The lubricant (D) for ceramic extrusion molding according to the present invention comprises a polyether (A) having a number average molecular weight of 6,000 to 30,000, wherein the polyether (A) is a polyether (A1) produced by adding an alkylene oxide to a compound having active hydrogen, an alkyl ether (A2) of the polyether (A1) and/or an ester (A3) of the polyether (A1), the alkylene oxide is ethylene oxide alone or a combination of ethylene oxide and an alkylene oxide having 3 carbon atoms, the ratio of the amount of ethylene oxide to the amount of the alkylene oxide having 3 carbon atoms is 30/70 to 100/0 by weight, and the kinematic viscosity of the polyether (A) is 200 to 20,000 (mm²/s) at 100˚C.