| abstract |
The invention relates to the adhesive bonding of fibrous materials, in particular of flexible supports, such as woven supports or nonwoven supports, comprising at least one silicone coating obtained by the application of a coat or by impregnation. The aim of the invention is to provide an improved process for combining together fiber/silicone composite parts using a silicone elastomer, which process has to be economical and not very expensive to carry out. n This aim is achieved by the invention, which relates to a process for the adhesive bonding of fibrous supports, this process being of the type of those consisting in causing the supports to be adhesively bonded to overlap one another, a silicone-based adhesive thermosetting by radical crosslinking using at least one peroxide being inserted between the supports over at least a portion of the region of overlap. The process is characterized in that it consists essentially in employing at least one silicone adhesive selected from Pumpable Silicone Elastomers (PSE) or Liquid Silicone Rubbers (LSR): e.g. MDD Vi M, comprising as filler silica treated with a silicone M OH DM OH , which are thermosetting by radical crosslinking using at least one peroxide, which are liquid at ambient temperature and which have a Brookfield viscosity η at 25° C.≧100 Pa·s and an extrusion rate Er in g.min −1 ≦−50; in directly forming and deploying this liquid adhesive on at least one of the supports to be adhesively bonded in their region of overlap; in holding the supports in intimate contact in their region of overlap comprising at least one layer of adhesive, so as to prevent any trapping of air at the interface; and in heating the supports thus held in intimate contact, so as to make possible the adhesive bonding of the supports by crosslinking of the adhesive. |