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Effect of NACL on cationic/anionic interaction of cationic guar
This is from SOLVAY about cationic guar gum.
“If the formulation also contains an anionic rheology modifier, avoid adding it directly on top of a cationic guar (or vice versa), as this could lead to the formation of lumps or flocculates. Amphoterics and simple salts may first be added to the cationic guar to help screen this interaction and prevent
flocculation.
Does simple salts mean NACL?
If yes, how does NACL prevent cationic/anionic interaction?
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8 Replies
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Because in solution, you’ll have free chrolide and sodium ions that could interact with polymer’s ionic groups, shielding them.
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So isn’t the calcium in water doing the same thing?
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The problem with calcium as with any other divalent ion, is that it coils the anionic polymer or at least, doesn’t let it expand, impairing the hydration process. Monovalent ions like sodium don’t do this and also easier to be exchanged for another cation.
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@ketchito thanks
How will calcium effect cationic polymer like cationic guar?
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For instance, if you use calciul chloride, in the presence of a cationic polymer, calcium ions won’t interact directly with the polymer, but it’d be chloride ions since they have opposite charge to toe positive ones in the polymer. As I see it, chloride negative charges will attach and detach in solution like any other monovalent ion, without any detrimental effect. The problem would be if you add an anionic surfactant, since calcium ion would compete with the polymer to interact with the anionic surfactant.
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Thanks
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If i add NACL to hard water, then anionic polymer, would chloride interact with calcium and then anionic polymer expand fully or not?
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For that you need a chelant. Inorganic ions tend to attach and detach in solution, but chelants bind strongly to ions.
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