| abstract |
The invention concerns a lubricating composition, in the form of an oil-in-water emulsion, based on siioxane and not releasing hydrogen comprising: (a) a polydiorganosiloxane oil non-reactive to the lubricating properties having a dynamic viscosity of the order of 5.10 −2 to 30.10 2 Pa.s at 25° C.; (b) a polyorganosiloxane resin bearing, before emulsification, condensable hydroxyl substituents and comprising before emulsification at least two syloxyl units selected among those of formula (R 0 ) 3 SiO 1/2 (M); (R 0 ) 2 SiO 2/2 (D); R 0 SiO 3/2 (T) and SiO 4/2 (Q), one at least of said units being a T or Q unit, formulae wherein: R 0 represents a monovalent organic substituent, the average number per molecule of organic radicals R 0 for a silicon atom ranging between 1 and 2; and said resin having a weight content of hydroxyl substituents ranging between 0.1 and 1 0 wt. %, and, preferably between 0.2 and 5 wt. %; (c) a crosslinking agent soluble in the silicone phase comprising at least two functions capable of reacting with the polyorganosiloxane resin (b); a condensation catalyst capable of catalysing the reaction of constituent (b) with constituent (c); (e) a surfactant; and (f) water. |