Please wait.'

Page is loading'


Home  > Raw materials & technologies  > Applications  > Effects of nonionic surfactants on stabili...

Friday, 15 December 2017
pdf
Raw materials & technologies, Applications

Effects of nonionic surfactants on stability of latex in cement paste

Tuesday, 5 December 2017

To clarify why surfactants affect the stability of latex in cement pastes and why many latexes qualified in standard stability tests still coagulate when mixed with cement, several kinds of nonionic surfactants were selected to study the interactions among cement, latex and surfactant.

Effects of nonionic surfactants on stability of latex in cement paste. Source: Stefan Körber - Fotolia.com

Effects of nonionic surfactants on stability of latex in cement paste. Source: Stefan Körber - Fotolia.com

Results show that a higher affinity of surfactant to polymer contributes to a higher stability of latex in cement paste.

Phenyl better than alkyl

When surfactants have similar hydrophilic group with each other, surfactants with phenyl in hydrophobic group can more effectively improve stability of styrene-acrylate (SA) latex in cement paste than that with n-alkyl. With the same hydrophobic group (octyl phenyl) in molecules, surfactants with shorter hydrophilic group show better stabilisation effect on SA latex. The combined action of high Ca2+ concentration, high solid concentration, and mechanical shear during agitation process of cement paste is the decisive factor causing coagulation of latex.

The study is published in: Applied Polymer Science, Volume 135, Issue 10, March 10, 2018

top of page
Comments (0)
Add Comment

Post comment

You are not logged in

register