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    • 65. 发明公开
    • Cement admixture and cement composition
    • Zementzusatzmittel sowie Zementzusammensetzung enthaltend dasselbe
    • EP2263984A2
    • 2010-12-22
    • EP10179840.3
    • 2002-05-28
    • NIPPON SHOKUBAI CO., LTD.
    • Yamashita, AkihikoTanaka, HiromichiHirata, TsuyoshiUno, ToruOnda, Yoshiyuki
    • C04B24/26C04B28/02C08L33/14C08L29/10C08F218/18C08F220/28C08F290/06
    • C08L51/08C04B24/2647C04B40/0039C04B2103/408C08F283/06C08F290/06C08F290/062C08L71/02C04B24/267C04B24/2694C04B28/02C08L2666/14C08L2666/24C08L2666/02C08L2666/04
    • It is an object of the present invention to provide a cement admixture capable of exhibiting high cement dispersing ability at low addition levels, in particular capable of displaying excellent initial dispersing ability and dispersion retaining ability even in a high water reducing ratio range, and a cement composition in which this admixture is used.
      A cement admixture comprising
      two polymers, namely a polymer (A) and a polymer (B), as essential constituents in a ratio of polymer (A) to polymer (B) between 1 to 99/99 to 1% by mass,
      wherein the polymer (A) is a polymer comprising, as essential constituent units, a constituent unit (I) derived from an unsaturated (poly)alkylene glycol ether monomer (a) and a constituent unit (II) derived from an unsaturated monocarboxylic acid monomer (b) and
      wherein the constituent units (I) and (II) each accounts for not less than 1% by mass relative to all constituent units but the constituent unit (I) accounts for not more than 50 mole percent relative to all constituent units and,
      wherein the polymer (B) is an oxyalkylene group- or polyoxyalkylene group- and carboxyl group-containing polymer.
    • 本发明的目的是提供一种能够以低添加量表现出高水泥分散能力的水泥混合物,特别是即使在高减水比范围内也能显示优异的初始分散能力和分散保持能力,以及水泥 使用该混合物的组合物。 作为聚合物(A)与聚合物(B)的比例在1〜99/99〜1质量%之间的作为聚合物(A)和聚合物(B)的两种聚合物的水泥混合物,其中, 聚合物(A)是以不饱和(聚)亚烷基二醇醚单体(a)和不饱和一元羧酸单体(b)为原料的构成单元(II)作为必须构成单元的构成单元(I) ),其中,相对于所有构成单元,构成单元(I)和(II)各自占不少于1质量%,但构成单元(I)相对于所有构成单元不超过50摩尔% 其中聚合物(B)是氧化烯基或聚氧化烯基和含羧基的聚合物。