Cement additive, method for producing the same, and cement composition
    100.
    发明授权
    Cement additive, method for producing the same, and cement composition 失效
    水泥添加剂,其制造方法和水泥组合物

    公开(公告)号:US5854318A

    公开(公告)日:1998-12-29

    申请号:US759435

    申请日:1996-12-05

    摘要: A cement additive is added to increase flowability of a cement composition and to prevent a slump loss, but those characters are insufficient, or the cement additive becomes ununiform in the cement composition and causes a trouble of the hardening inferiority. Thus, to solve the subjects, the present invention provides a cement additive composed of a crosslinked polymer in which, between main chains having a water-soluble polymer structure of a molecular weight from 500 to 100,000, a bond having as a structural unit at least one group selected from divalent groups as shown in the following formula (I) is formed. ##STR1## �In the formula (I), R.sup.1 and R.sup.2 independently denote any one of the following. ##STR2## However, R.sup.1 may not be required in a case of that R.sup.2 is the following. ##STR3## Moreover, R and R' independently denote an alkyl group of carbon number of 1 to 5.!

    摘要翻译: 添加水泥添加剂以增加水泥组合物的流动性并防止坍落度损失,但是这些特性不足,或者水泥添加剂在水泥组合物中变得不均匀并导致硬化劣化的问题。 因此,为了解决问题,本发明提供一种由交联聚合物组成的水泥添加剂,其中在分子量为500至100,000的水溶性聚合物结构的主链之间,至少具有结构单元的键 形成如下式(I)所示的选自二价基团的一个基团。 (I)[式(I)中,R 1和R 2各自独立地表示以下任何一个。 但是,在R2的情况下,可能不需要R1。 此外,R和R'独立地表示碳数为1〜5的烷基。]