| 摘要 |
<p>: Additive for inorganic binders, such as cements, calcium sulfate, magnesia cement and the like, which comprises, as the active ingredient, a water-soluble salt of a mixed resin consisting of an aromatic aminosulfonic acid, urea, melamine and formaldehyde, the molar ratio, in the resin, of aromatic aminosulfonic acid to the total amount of melamine and urea being (0.2 to 1.0) : 1.0 and the molar ratio of melamine to urea being from 0.75 : 0,25 to 0.30 : 0.70, and also building materials, having increased flowability and early strength, in which this additive is present.</p> |
