THICKENER FOR GYPSUM PLASTER AND GYPSUM PLASTER CONTAINING THE SAME

摘要

The present invention relates to a thickener for gypsum plaster, including hydroxyl ethyl methyl cellulose (HEMC) whose degree of substituent of methyl groups (DS) is 1.0 to 1.5 and degree of substituent of hydroxyl ethyl groups (MS) is 0.2 to 0.4 and hydroxyl ethyl cellulose whose degree of substituent of hydroxyl ethyl groups (MS) is 1.6 to 3.5, and a gypsum plaster including the same wherein the provided thickener for gypsum plaster is made by mixing hydroxyl ethyl methyl cellulose with certain degree of substituent and hydroxyl ethyl cellulose, thereby providing gypsum plaster which has good water retention property at high temperatures and improved workability, working time and resistance to sagging.