MULTILAYER STRUCTURE FOR TRANSPORTING OR STORING HYDROGEN
A multilayer structure for transporting hydrogen, including, from the inside, a sealing layer and at least one composite reinforcement layer, an innermost composite reinforcement layer being wound around the sealing layer, the sealing layer being a composition predominantly of: a polyamide thermoplastic polymer PA11, up to less than 15% by weight of impact modifier, up to 1.5% by weight of plasticizer relative to the total weight of the composition, the composition being devoid of nucleating agent and of polyether block amide (PEBA), and at least one of the composite reinforcement layers being a fibrous material in the form of continuous fibers, which is impregnated with a composition predominantly of at least one polymer P2j, (j=1 to m, m being the number of reinforcement layers), the structure being devoid of an outermost layer and adjacent to the outermost layer of a composite reinforcement layer made of a polyamide polymer.
1 . A multilayer structure intended for transporting, distributing, or storing hydrogen, comprising, from the inside to the outside, at least one sealing layer and at least one composite reinforcement layer,
an innermost composite reinforcement layer being wound around said sealing layer,
said sealing layer consisting of a composition comprising:
a thermoplastic polyamide polymer PA11,
up to less than 15% by weight of impact modifier relative to the total weight of the composition,
up to 1.5% by weight of plasticizer relative to the total weight of the composition,
said composition being devoid of nucleating agent and polyether block amide (PEBA),
and at least one of said composite reinforcement layers consisting of a fibrous material in the form of continuous fibers, which is impregnated with a composition predominantly comprising at least one polymer P2j, j=1 to m, m being the number of reinforcement layers, in particular an epoxide resin or epoxide-based resin,
said structure being devoid of an outermost layer and adjacent to the outermost composite reinforcement layer made of a polyamide polymer.
2 . The multilayer structure according to claim 1 , wherein each reinforcement layer comprises the same type of polymer, in particular an epoxide resin or epoxide-based resin.
3 . The multilayer structure according to claim 1 , wherein it has a single reinforcement layer.
4 . The multilayer structure according to claim 1 , wherein said polymer P2j is an epoxide resin or epoxide-based resin.
5 . The multilayer structure according to claim 3 , wherein said multilayer structure is composed of a single reinforcement layer and said polymer P2j is an epoxide resin or epoxide-based resin.
6 . The multilayer structure according to claim 1 , wherein the fibrous material of the composite reinforcement layer is selected from glass fibers, carbon fibers, basalt fibers or basalt-based fibers, or a mixture thereof.
7 . The multilayer structure according to claim 1 , wherein said structure further comprises at least one outer layer consisting of a fibrous material made of continuous glass fibers, which is impregnated with a transparent amorphous polymer, said layer being the outermost layer of said multilayer structure.
8 . A method for producing a multilayer structure as defined in wherein it comprises a step of preparing the sealing layer by extrusion blow molding, rotational molding, injection molding and/or extrusion.
9 . The method for producing a multilayer structure according to claim 8 , wherein it comprises a step of filament winding of the reinforcement layer around the sealing layer.