29-12-2016 дата публикации
Номер: US20160376517A1
Принадлежит:
A method of lubricating an expandable rubber bladder is described for use during a vulcanization of a green tire within a metal press. The method can include applying compositions in the form of emulsions of silicone oils to the inner surface of the green tires and/or to the outer surface of the vulcanization bladders to facilitate the molding-demolding thereof during the manufacture of the tires. 1. A method lubricating an expandable rubber bladder use during a vulcanization of a green tire within a metal press , the outer surface of bladder , brought to be in contact with the inner face of green tire , with a mold release agent composition (I) in the form of an oil-in-water emulsion comprising:(a) at least one reactive polyorganosiloxane (A) comprising, per molecule, at least two ≡SiOH silanol groups;(b) at least one crosslinking agent (B) having, per molecule, at least three ≡SiH units;{'sub': 1', '6', '3', '8', '6', '10', '7', '15, '(c) at least one non-reactive linear polyorganosiloxane oil (C) which is a linear homopolymer or copolymer which has, per molecule, monovalent organic substituents, which are identical to or different from one another, bonded to the silicon atoms, and which are selected from the group consisting of C-Calkyl, C-Ccycloalkyl, C-Caryl and C-Calkylaryl radicals;'}(d) glass beads (D) as spherical amorphous filler;(e) at least one surfactant (E);(f) optionally at least one additive (F) selected from the group consisting of: a film-forming polymer, a complementary lubricant, an antifriction agent, a coalescence agent, a wetting or dispersing agent, a mineral filler, an antifoam agent, a thickener, a stabilizer, an acidifying agent, a biocide and an antifungal agent;(g) optionally at least one dehydrogenation-condensation catalyst (G), and (h) water (H),the amounts of surfactant(s) and of water being sufficient to obtain an oil-in-water emulsion; method making it possible to obtain an expandable rubber bladder that is lubricated on its outer ...
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