Pressure vessel, liner and method for manufacturing a pressure vessel
Provided is a pressure vessel having an outer layer with an improved gas barrier property, a lightweight liner with an excellent gas barrier property, and a novel method for manufacturing a pressure vessel. The pressure vessel contains a liner and an outer layer of the liner, wherein the outer layer is configured by a composite material that contains a continuous fiber and a polyamide resin impregnated into the continuous fiber; the polyamide resin contains a structural unit derived from diamine and a structural unit derived from dicarboxylic acid; and 50 mol % or more of the structural unit derived from diamine is derived from xylylenediamine.
1. A pressure vessel comprising:
a liner and an outer layer of the liner,
wherein the outer layer is configured by a composite material that contains a continuous fiber and a polyamide resin impregnated into the continuous fiber, the outer layer having a void ratio of 10% or smaller;
the polyamide resin of the outer layer contains a structural unit derived from diamine and a structural unit derived from dicarboxylic acid; and
70 mol % or more of the structural unit derived from diamine is derived from metaxylylenediamine,
70 mol % or more of the structural unit derived from dicarboxylic acid is derived from adipic acid,
wherein the liner is composed of at least 50% by mass or more of a polyamide resin,
the polyamide resin of the liner comprises a structural unit derived from diamine and a structural unit derived from dicarboxylic acid, wherein 50 mol % or more of the structural unit derived from diamine is derived from xylylenediamine,
wherein 90% by mass or more of the polyamide resin used for the composite material and 90% by mass or more of the polyamide resin used for the liner are the same polyamide resin.
2. The pressure vessel of claim 1 , wherein the outer layer has a gas transmission coefficient at 23° C. and 50% relative humidity of 0.10 ml·mm/m 2 ·day·atm or smaller.
3. The pressure vessel of claim 1 , wherein the continuous fiber is at least one fiber selected from carbon fiber and glass fiber.
4. The pressure vessel of claim 1 , wherein the ratio of the continuous fiber in the outer layer is 10 to 80 V/V %.
5. A pressure vessel comprising:
a liner composed of a composite material having a polyamide resin impregnated into a continuous fiber,
the liner being the inner most layer of the pressure vessel and the only gas barrier layer in a body portion of the pressure vessel, and
the liner having a gas transmission coefficient at 23° C., 50% relative humidity of 0.10 cc·mm/m 2 ·day·atm or less.
6. The pressure vessel of claim 5 , wherein the polyamide resin contains a structural unit derived from diamine and a structural unit derived from dicarboxylic acid, and 50 mol % or more of the structural unit derived from diamine is xylylenediamine.
7. The pressure vessel of claim 6 , wherein 70 mol % or more of the structural unit derived from diamine is derived from metaxylylenediamine.
8. The pressure vessel of claim 6 , wherein 70 mol % or more of the structural unit derived from dicarboxylic acid is derived from a straight chain aliphatic am-dicarboxylic acid having 4 to 20 carbon atoms.
9. The pressure vessel of claim 6 , wherein 70 mol % or more of the structural unit derived from diamine is derived from metaxylylenediamine, and 70 mol % or more of the structural unit derived from dicarboxylic acid is derived from at least either one of adipic acid and sebacic acid.
10. The pressure vessel of claim 6 , wherein 70 mol % or more of the structural unit derived from diamine is derived from metaxylylenediamine, and 70 mol % or more of the structural unit derived from dicarboxylic acid is derived from adipic acid.
11. The pressure vessel of claim 5 , wherein the liner has a void ratio of 10% or smaller.
12. The pressure vessel of claim 5 , wherein the continuous fiber is at least one fiber selected from carbon fiber and glass fiber.
13. The pressure vessel of claim 5 , wherein the ratio of the continuous fiber in the liner is 10 to 80 V/V %.