Hydrophobic Inorganic Oxide Pigments via Polymethylhydrosiloxane Grafting: Dispersion in Aqueous Solution at Extraordinarily High Solids Concentrations

Guo, Yijun; Mishra, Manish K.; Wang, Futianyi; Jankolovits, Joseph; Kusoglu, Ahmet; Weber, Adam Z.; Van Dyk, Ant; Beshah, Kebede; Bohling, James C.; Roper III, John A.; Radke, Clayton J.; Katz, Alexander

doi:10.1021/acs.langmuir.8b01898

Title: Hydrophobic Inorganic Oxide Pigments via Polymethylhydrosiloxane Grafting: Dispersion in Aqueous Solution at Extraordinarily High Solids Concentrations

Journal Article · Tue Aug 28 00:00:00 EDT 2018 · Langmuir

DOI:https://doi.org/10.1021/acs.langmuir.8b01898· OSTI ID:1571112

Guo, Yijun ^[1];

^[1]; Wang, Futianyi ^[1]; Jankolovits, Joseph ^[1];

^[2];

^[2]; Van Dyk, Ant ^[3]; Beshah, Kebede ^[3]; Bohling, James C. ^[3]; Roper III, John A. ^[3]; Radke, Clayton J. ^[1];

^[1]

Univ. of California, Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
The Dow Chemical Company, Midland, MI (United States)

Building on the recent demonstration of aqueous-dispersible hydrophobic pigments that retain their surface hydrophobicity even after drying, we demonstrate the synthesis of surface-modified Ti-Pure R-706 (denoted R706) titanium dioxide-based pigments, consisting of a thin (one to three monolayers) grafted polymethylhydrosiloxane (PMHS) coating, which (i) are hydrophobic in the dry state according to capillary rise and dynamic vapor sorption measurements and (ii) form stable aqueous dispersions at solid contents exceeding 75 wt % (43 vol %), without added dispersant, displaying similar rheology to R706 native oxide pigments at 70 wt % (37 vol %) consisting of an optimal amount of conventional polyanionic dispersant (0.3 wt % on pigment basis). Additionally, the surface-modified pigments have been characterized via ²⁹Si and ¹³C cross-polarization/magic angle spinning solid-state NMR spectroscopy; infrared spectroscopy; thermogravimetric and elemental analyses; and ζ potential measurements. On the basis of these data, the stability of the surface-modified PMHS-R706 aqueous dispersions is attributed to steric effects, as a result of grafted PMHS strands on the R706 surface, and depends on the chaotropic nature of the base used during PMHS condensation to the pigment/polysiloxane interface. The lack of water wettability of the surface-modified oxide particles in their dry state translates to improved water-barrier properties in coatings produced with these surface-modified pigment particles. Finally, the synthetic approach appears general as demonstrated by its application to various inorganic-oxide pigment particles.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1571112

Journal Information:: Langmuir, Vol. 34, Issue 39; ISSN 0743-7463

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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