November 28, 2022, 02:22:44 PM
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Topic: Fumed silica reaction with Phosphoric acid esters  (Read 2416 times)

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ioannis

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Fumed silica reaction with Phosphoric acid esters
« on: May 06, 2022, 08:36:46 AM »
Hi all,
I am having issues in some of my formulations. I am using Aerosil R972 (Silane, dichlorodimethyl-, reaction products with silica) in a paint solvent-bourne system for its anti-settling, anti-sagging and corrosion resistance properties. Lately I observed clusters on the paint surface after the addition of a solution of polymeric phosforic acid ester (DISPERBYK-110) as a wetting and dispersing additive. Is it possible that silica reacts with the phosphoric acid ester to cause silica particle clusters?

Thanks in advance,

Ioannis

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Re: Fumed silica reaction with Phosphoric acid esters
« Reply #1 on: May 06, 2022, 05:08:02 PM »
I would say yes. Wetting means it has hydrophobic groups, which easily react with silan compounds.

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