| 摘要 |
PROBLEM TO BE SOLVED: To obtain a powdery cement dispersant with high concn. easy to handle by adding a polyalkylene glycol or a fatty acid having a specified number of C atoms to an aq. soln. of a polycarboxylic acid type high molecular compd. having a polyalkylene glycol chain and converting the aq. soln. into dry powder. SOLUTION: The powdery cement dispersant contains particles contg. 100 pts.wt. polycarboxylic acid type high molecular compd. having a polyalkylene glycol chain, about 0.2-30 pts.wt. polyalkylene glycol or 8-22C fatty acid and, optionally, about 0.1-30 pts.wt. inorg. powder and preferably has 5-2,000μm average particle diameter. The polycarboxylic acid type high molecular compd. is preferably a (meth)acrylic acid or maleic acid copolymer having a number average mol.wt. of about 2,000-50,000. The polyalkylene glycol is preferably a polyethylene glycol having a number average mol.wt. of 1,000-200,000 or a polypropylene glycol having a number average mol.wt. 2,000-6,000. |
