Preparation of Nano-Sized Polydimethylsiloxane Emulsion
Dimethyl silicone emulsion was prepared with polydimethylsiloxane(PDMS),three types of polyethylene glycol monoisotridecyl ether and sodium dodecyl benzene sulfonate as emulsifier,and water as dispersion medium,by mechanical emul-sification.The influences of the mass ratio of nonionic emulsifier,the amount of the nonionic emulsifier,stirring speed and the emulsification time on the emulsion performance were studied.The results show that when the ratio of emulsifier is m(1303)∶m(1307)∶m(1310)=1∶2∶1,nonionic emulsifier amount is 12%(relative to PDMS),stirring speed is 2 000 r/min,and the emul-sification time is 90 min.Under these conditions,the particle sizes of PDMS emulsion range from 100 to 600 nm,the emulsion appearance is milky white liquid with blue light,the water dispersibility is grade 5 and the centrifugal stability and dilution stabil-ity are good.
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