Synthesis and properties of trisiloxane-based carboxylate surfactant
A new trisiloxane-based carboxylate surfactant,sodium heptamethyl trisiloxane propionate(TSO-SP),was synthesized by hydrosilylation and hydrolytic reaction of ester.The main raw materials were 1,1,1,3,5,5,5-heptamethyltrisiloxane(TSO)and ethyl acrylate(EA).The structure of the product was characterized by Fourier transform infrared spectrometer(FT-IR).Moreover,the surface tension,foaming property,defoam-ing property,emulsifying property,contacting angle and thermal stability of the surfactant were tested.Results showed that the critical micelle concentration(CMC)of the surfactant was 7.94×10-3 mol/L,and the minimum surface tension was 26.18 mN/m.The foaming volume of TSO-SP was 2 mL at the mass concentration of 2 g/L,and the stability rate of the form was 25%within 5 minutes.Antifoaming effect of TSO-SP from large to small was CTAB,SDBS,APG-0814.The emulsifying effect of TSO-SP on corn oil was much better than that of liq-uid paraffin,dimethicone(350 Pa·s)and cyclohexane.The solution of TSO-SP could wet the surface of solid paraffin wax at the mass concentration of 1 g/L,and the final equilibrium contact angle was 72°.The pyrolysis temperature of TSO-SP was 330 °C,which had good thermal stability.
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