Surfactants

摘要

A particulate material for the production of a cement foam which material includes particles including, attached to the particle surface, a surfactant which renders the particles hydrophilic, the surfactant including a moiety which is hydrolysable under alkaline conditions, which surfactant, after loss of the moiety by alkaline hydrolysis, renders the particles partially hydrophobic.

主权项

1. A particulate material for the production of a cement foam which material comprises particles comprising, attached to the particle surface, a surfactant which renders the particles hydrophilic, the surfactant comprising a moiety which is hydrolysable under alkaline conditions, which surfactant, after loss of the moiety by alkaline hydrolysis, renders the particles partially hydrophobic, wherein the surfactant is of the general formula:
(A)qB-E-D  (I) wherein A represents a group attached to the group B and capable of attaching to the surface of a particle; and q is from 1 to 6; B represents a hydrophobic group capable of rendering the particle partially hydrophobic; E represents a group susceptible to alkaline hydrolysis; and D represents a hydrophilic group which renders the surfactant water soluble.