| 摘要 |
PURPOSE:To obtain a self-leveling aqueous composition capable of keeping high fluidity for a long term, attaining excellent workability and excellent strength development by using a cement mixed with natural type 11 anhydrous gypsum in a specific ratio as a base material and an acrylic dispersing agent having a specific structure. CONSTITUTION:This self-leveling aqueous composition is obtained by blending 0.1-3 pts.wt. acrylic dispersing agent, 30-300 pts.wt. setting accelerator for gypsum, shrinkage reducing agent, thickener, defoaming agent and aggregate and 30-60 pts.wt. water based on 100 pts.wt. base material having the cement mixed with the natural type 11 anhydrous gypsum in the weight ratio of 40/60 to 80/20. The acrylic dispersing agent is obtained carrying out aqueous radical copolymerixation of 45-65mol% monomer expressed by a formula I [R<1> is H or methyl; M<1> is alkali (alkaline earth) metal, ammonium or an organic amine], 8-23mol% monomer expressed by a formula II (X is -SO3M<1> or a formula VI and M<3> is M<1>), 3-25% monomer expressed by a formula III [R<2> and R<3> each is R<1>; (m) is 1-30], 5-25mol% monomer expressed by a formula IV [R<4> is R<1>, R<5> is 1-3C alkyl and (n) is 5-50] and 3-15mol% monomer expressed by a formula V (R<6> is R<1> and R<7> is R<5>). |
