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Novel nonionic siloxane surfactants

✍ Scribed by R Wersig; G Sonnek; C Niemann

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Weight
489 KB
Volume
6
Category
Article
ISSN
0268-2605

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✦ Synopsis

A new method for ethoxylation without application of pressure is described. Butynediololigo(oxyethy1ene) [H(OCH2CH2),-OCH2-C= C-CH20(CH2CH,0),H with n = 1-16] has been prepared in the presence of an electrophilic catalyst in a specially developed reciruculating apparatus. The products have been characterized by NMR and IR spectroscopy.

New nonionic silicone surfactants have been synthesized by hydrosilylation of these butynediololigo(oxyethylenes) with defined siloxanes and polysiloxanes. Protection of the hydroxyl group before hydrosilylation was not necessary. Hydrosilylation was carried out in the presence of a solvent. It has been possible to obtain surfactants with a surface tension of about 21-22 mN m-' and an interfacial tension of 2 mN m-'.

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