METHOD FOR PREPARATION OF HYDROXYALKYLALKYLCELLULOSE ETHERS WITH HIGH FLOW RESISTANCE FOR JOINT COMPOUND

摘要

Provided are a method for preparing a hydroxyalkylalkylcellulose for a joint compound, a hydroxyalkylalkylcellulose for a joint compound prepared by the method which is used to improve flow resistance and to prevent sagging when applied to a join compound, and a joint compound containing the hydroxyalkylalkylcellulose. The method comprises the steps of injecting an alkali metal hydroxide into cellulose in ratio of 0.5-4 mol to cellulose, stirring the mixture, and injecting an alkylene oxide into the mixture in a ratio of 0.3-1.0 mol to cellulose to perform first reaction; and injecting an alkali metal hydroxide into the obtained one in a ratio of 0.5-3 mol to cellulose, dispersing it, and injecting an alkyl halide to it in a ratio of 1-2.5 mol to the added alkali metal hydroxide to perform second reaction to prepare a hydroxyalkylalkylcellulose. Preferably the first reaction is carried out at 60-110 deg.C, and the second reaction is carried out at 50-120 deg.C.