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Citation: WU Fei, CAI Chun, CAO Zhi-Ping. Synthesis and Property of Breaking & Inhibiting Foam of Fluorine-containing Polysiloxanes[J]. Chinese Journal of Applied Chemistry, ;2007, 24(9): 1058-1061. shu

Synthesis and Property of Breaking & Inhibiting Foam of Fluorine-containing Polysiloxanes

WU Fei ^a,b ,
CAI Chun ^a,, ,
CAO Zhi-Ping ^b

1.
a Chemical Engineering College, Nanjing University of Science & Technology, Nanjing 210094;
2.
b Nanjing Sixin Science & Technology Company, Nanjing

Corresponding author: CAI Chun,
Received Date: 24 September 2006
Available Online: 5 December 2006

By reaction with Me₄NOH, a series of fluorine-containing polysiloxanes(PTFMS) were synthesized from D₄, D₃F and MDM with different contents [x(D^F)/%] of SiCH₃(CF₃CH₂CH₂)O chain of PTFMS. Parameters such as refractive index n_25℃^D, viscosity η^25℃ and surface free energy _D^25℃ were tested. The performance of breaking and inhibiting foam of single PTFMS and the mixture of PTFMS and silica in water- and oil-based systems were studied, respectively. Results show that with the increase of x(D^F), the value of η_D^25℃ decreases from 1.404 0 to 1.378 5, and the value of viscosity in both water- and oil-based systems increases from 58.13 mPa·s to 214.3 mPa·s, and value of surface free energy increases from 18.96 mN/m to 21.37 mN/m. In an oil-based system, the performance of breaking foam of single PTFMS and the mixture of PTFMS and silica is better than that of MD₀^FD₂₀M, and doesn't change obviously with the increase of x(D^F). The performance of foam inhibition for the compounds improve with the increase of x(D^F). Silica is not helpful for antifoaming function of PTFMS in the oil-based system, which lays a foundation for choosing antifoam in an oil-based system. In a water-based system, the performance of breaking and inhibiting foam of single PTFMS is poor. With the aid of silica, the breaking foam ability of PTFMS increases significantly, and the inhibiting foam ability becomes better at first, but then worse, so silica is helpful for antifoaming function of PTFMS in a water-based system.
- PTFMS,
- water-based system,
- oil-based system,
- breaking foam performance,
- inhibiting foam performance
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