| abstract |
The invention concerns bonding of fibrous materials, in particular flexible supports such as woven supports or nonwoven supports comprising at least one silicone coating obtained by surface application or impregnation. The invention aims at providing an improved method for assembling fiber/silicone composites by means of a silicone elastomer, said method being economical and capable of being implemented at low cost. Therefor, the invention concerns a method for bonding fibrous supports, said method consisting in causing the supports to be bonded to overlap, an adhesive made of silicone capable of being heat-cured by free radical crosslinking with at least one peroxide being inserted between the supports, over at least part of the overlapping zone. The method is characterized in that it essentially consists in using at least one adhesive selected among pumpable elastomer silicone or liquid silicone rubbers, for instance MDDViM, filled with silica treated with MOHDMOH silicone, capable of being heat-cured by free radical crosslinking with at least one peroxide, liquid at room temperature and having a Brookfield viscosity η at 25°C ≥ 100 Pa's and an extrusion speed Ve in g.min-1 ≤ 50, in directly forming said adhesive and placing it on at least one of the supports to be bonded, in their overlapping zone; in maintaining in close contact the supports in their overlapping zone comprising at least one adhesive layer, so as to prevent air from being trapped at the interface; and in heating the supports thus maintained in close contact, so as to enable the supports to be bonded by crosslinkage of the adhesive. |