There are different methods for preparing micro-filtration membranes based on Kaolin. Almost all of them use Amijel as the binder. I wanna use another binder. I think Polysaccharide base materials could do the job. I am not sure about different celluloses, PEG, PVP,...
P.S. Corn starch & similar materials can't be used as Amijel. I wonder if one of these can be useful: Xanthan gum, Pectin, Guar gum, Agar-agar.
P.S. I already have Methocel.
I would appreciate if anyone help me with this.
Dear Sajad,
The following paper covers the answer to your question:
Applied Clay Science
Volume 23, Issues 5–6, October 2003, Pages 257–264
Influence of deagglomeration and carboxymethyl cellulose binders on rheological behaviour of kaolin suspensions
S.I. Conceiçãoa, b, J.L. Velhoa, J.M.F. Ferreira, b,
Abstract
http://www.sciencedirect.com/science/article/pii/S016913170300125X
The influence of adding two carboxymethyl cellulose (CMC) binder/thickening agents with different molecular weights on the rheological behaviour of kaolin suspensions has been investigated in the presence of ammonium polycarbonate as dispersant.
Ball milling performed deagglomeration of the kaolin. The suspensions were prepared at different solid contents from 20 to 45 vol.%, and the rheological measurements were made on these suspensions (nondiluted systems) and compared with those performed on suspensions containing the same solid volume fractions but derived from a more concentrated one (45 vol.%) by adding the required amounts of water (diluted systems). The experimental results showed that at given solid loading, diluted systems are less viscous and pack better than nondiluted ones. This indicates that in the range of solid concentration studied, increasing the solid volume fraction enhances deagglomeration of kaolin particles.
The rheological effects of adding CMC binder/thickening agents strongly depended on the amount added, molecular weight (MW), and the suspension preparation procedure. The strong thickening effect was generally observed for the higher MW CMC, followed by the mixture of both, although a different sequence has been observed for the more concentrated and nondiluted systems. Slip casting experiments were also performed in order to correlate the flow characteristics of the suspensions with their ability towards packing.
Hoping this will be helpful,
Rafik
Dear Sajad,
The following paper covers the answer to your question:
Applied Clay Science
Volume 23, Issues 5–6, October 2003, Pages 257–264
Influence of deagglomeration and carboxymethyl cellulose binders on rheological behaviour of kaolin suspensions
S.I. Conceiçãoa, b, J.L. Velhoa, J.M.F. Ferreira, b,
Abstract
http://www.sciencedirect.com/science/article/pii/S016913170300125X
The influence of adding two carboxymethyl cellulose (CMC) binder/thickening agents with different molecular weights on the rheological behaviour of kaolin suspensions has been investigated in the presence of ammonium polycarbonate as dispersant.
Ball milling performed deagglomeration of the kaolin. The suspensions were prepared at different solid contents from 20 to 45 vol.%, and the rheological measurements were made on these suspensions (nondiluted systems) and compared with those performed on suspensions containing the same solid volume fractions but derived from a more concentrated one (45 vol.%) by adding the required amounts of water (diluted systems). The experimental results showed that at given solid loading, diluted systems are less viscous and pack better than nondiluted ones. This indicates that in the range of solid concentration studied, increasing the solid volume fraction enhances deagglomeration of kaolin particles.
The rheological effects of adding CMC binder/thickening agents strongly depended on the amount added, molecular weight (MW), and the suspension preparation procedure. The strong thickening effect was generally observed for the higher MW CMC, followed by the mixture of both, although a different sequence has been observed for the more concentrated and nondiluted systems. Slip casting experiments were also performed in order to correlate the flow characteristics of the suspensions with their ability towards packing.
Hoping this will be helpful,
Rafik
Dear Rafik.
Thanks for your help. That definitely was helpful. It could give me the idea of what variable influence the rheological behavior of Kaolin paste.