WATER-REDUCING AGENT FOR CEMENT
    10.
    发明专利

    公开(公告)号:JPH03187960A

    公开(公告)日:1991-08-15

    申请号:JP21943590

    申请日:1990-08-21

    摘要: PURPOSE:To improve the flowability of a cement composition in a state reduced in the ageing change of the flowability by employing a bisphenol compound as a phenol compound in a small amount in a reducing agent containing an aromatic aminosulfonic acid.the phenol.formaldehyde condensate. CONSTITUTION:The water-reducing agent for cement contains as a main component the formaldehyde condensate of 4-aminobenzene sulfonic acid or a salt thereof and a bisphenol compound or salt thereof. The remained monomer (the aromatic aminosulfonic acid) in the aromatic aminosulfonic acid mixing agent is reduced, and polar groups and a steric property are imparted to the hydrophobic skeleton, thereby permitting to improve the flowability of the cement composition without deteriorating the flowability ageing reduction- preventing effect thereof. The bisphenol compound includes bisphenols A, S and F.