Composite pressure vessel with a monolayer liner
A composite pressure vessel that includes a monolayer liner and a reinforcing structure arranged on top of the liner. The liner is made by injection moulding and includes at least two shells weldable together. Each shell is made of a polymer composition including at least 45% by weight of an aromatic polyamide relative to the total weight of the polymer composition, and at least 10% by weight of an aliphatic polyamide relative to the total weight of the polymer composition.
1. A composite pressure vessel comprising a monolayer liner and a reinforcing structure arranged on top of the liner, the liner being made by injection moulding, the liner comprising at least two shells weldable together,
wherein each shell is made of a polymer composition, wherein the polymer composition for each shell is a blend comprising:
at least 45% by weight of an aromatic polyamide relative to the total weight of said polymer composition, wherein the aromatic polyamide is a polyphtalamide (PPA), and
at least 10% by weight of an aliphatic polyamide relative to the total weight of said polymer composition, wherein the maximum content of aromatic group-containing repeating units in an aliphatic polyamide is 0 mol % based on 100 mol % repeating units in the aliphatic polyamide.
2. The composite pressure vessel according to claim 1 , wherein said polymer composition comprises from 65 to 90% by weight of aromatic polyamide relative to the total weight of said polymer composition, and from 10 to 35% by weight of aliphatic polyamide relative to the total weight of said polymer composition.
3. The composite pressure vessel according to claim 2 , wherein the aliphatic polyamide is selected from a PA6, PA6.6, PA6.12, PA4.6, PA11, and/or PA12.
4. The composite pressure vessel according to claim 1 , wherein the aromatic polyamide is selected from PA6T, PA6T/61 and/or PA 6T/61/66.
5. The composite pressure vessel according to claim 1 , wherein the aliphatic polyamide is selected from a PA6, PA6.6, PA6.12, PA4.6, PA11, and/or PA12.
6. The composite pressure vessel according to claim 5 , wherein the aliphatic polyamide is a PA6 or/and PA6.6.
7. The composite pressure vessel according to claim 1 , wherein the reinforcing structure is a filament winding or a tape winding.
8. A vehicle comprising a composite pressure vessel as claimed in claim 1 .
9. The composite pressure vessel according to claim 1 , weight ratio between the aromatic polyamide and the aliphatic polyamide is comprised between 1.4 and 9.