COMPOSITION OF CROSSLINKABLE ELASTOMER SILICONE OILS FOR TREATMENT BY IMPREGNATION OF FIBROUS MATERIALS

摘要

The invention relates to a hydrosilylation (polyaddition)-vulcanizing elastomer silicone composition, especially of the bicomponent type (called RTV-2), useful for treating fibrous materials (in particular flexible supports such as woven or nonwoven supports). The aim of said invention is to produce a liquid 100% RTV-2 silicone composition for impregnating woven or nonwoven fibrous supports, which are core- and surface-treated to give improved properties in terms of mechanical reinforcement, water repellence, waterproofing, aspect, flameproofing and above all resistance to capillary rise. Said aim is achieved, whereby the crosslinkable liquid elastomer silicone composition comprises (a) a vinylated polyorganosiloxane (POS), (b) at least one hydrogenated POS, (c) a platinum catalyst, (d) optionally a coupling agent, (e) optionally a mineral filler, (f) optionally a crosslinking inhibitor, and optionally a POS resin and functional additives. Said composition is characterised in that it has a dynamic viscosity between 1,000 and 7,000 mPa.s, at 25 DEG C, more preferably between 2,000 and 5,000 mPa.s at 25 DEG C before crosslinking and, after overall crosslinking by thermal effect (i. e. curing at 150 DEG C for 30 minutes in a ventilated oven) has at least one of the following mechanical properties: a Shore A hardness of at least 2, preferably between 5 and 65, a breaking strength of at least 0.5 N.mm<-1>,< >preferably of at least 1.0 N.mm<-1 >and more preferably of at least 2 N.mm<-1>, and a breaking elongation of at least 50%, preferably of at least 100% and more preferably of at least 200%. Said invention also relates to the composite which is fully impregnated by means of a 100% RTV-2 silicone liquid.