Vehicle pressurized gas tank

Abstract

A pressurized tank comprising at least one composite reinforced structure at least partially covered by a protective coating, wherein the protective coating comprises at least two polyurea-based protective layers, at least one of the one or more polyurea-based protective layers further comprising a flame retardant which is an expander, the polyurea being a reaction product of at least one curing agent and at least one resin, the at least one resin of the first polyurea-based protective layer being different from the at least one resin of the second polyurea-based protective layer, and the protective layer containing the expander being the outermost layer of the coating. The present application also relates to a method for preparing such a tank and a vehicle comprising the same.

Claims

1. - A composite reinforced structure at least partially covered by a protective coating, wherein the protective coating comprises at least two polyurea-based protective layers, - A protective layer based on one or more polyureas, further comprising at least one flame retardant which is an expander, wherein the polyurea is a reaction product of at least one curing agent and at least one resin. (i) The resin is an aromatic or aliphatic polyamine compound in which at least one alcohol group is selectively substituted, (ii) The curing agent is an aromatic, cycloaliphatic, heterocyclic, alicyclic, or aliphatic polyisocyanate compound, and reaction products thereof in the form of aliphatic or aromatic oligomers. At least one resin of the first polyurea-based protective layer differs from at least one resin of the second polyurea-based protective layer. One or more polyurea-based protective layers, the outermost layer of the coating, containing a swelling agent. A pressurized tank, including a pressurized tank.

2. - Liner, and - A composite reinforced structure at least partially covered by a protective coating, wherein the protective coating comprises at least two polyurea-based protective layers. - A protective layer based on one or more polyureas, further comprising at least one flame retardant which is an expander, wherein the polyurea is a reaction product of at least one curing agent and at least one resin. (i) The resin is an aromatic or aliphatic polyamine compound in which at least one alcohol group is selectively substituted, (ii) The curing agent is an aromatic, cycloaliphatic, heterocyclic, alicyclic, or aliphatic polyisocyanate compound, and reaction products thereof in the form of aliphatic or aromatic oligomers. At least one resin of the first polyurea-based protective layer differs from at least one resin of the second polyurea-based protective layer. One or more polyurea-based protective layers, the outermost layer of the coating, containing a swelling agent. A pressurized tank according to claim 1, characterized by including the following:

3. The tank according to claim 1 or 2, characterized in that the overall thickness of the protective coating is 12 mm or less, particularly 8 mm or less, specifically 4 mm or less, and the overall thickness is 1 mm or more.

4. The tank according to any one of claims 1 to 3, characterized in that the leavening agent is selected from the group consisting of halogen compounds, phosphorus compounds, boron compounds, metal hydroxides, and metal oxides, and mixtures of at least two thereof.

5. The tank according to any one of claims 1 to 4, characterized in that at least one polyurea-based protective layer comprises at least one filler in the form of particles or fibers, wherein the filler is selected from ceramics, metals, metal oxides, plastics, and mixtures thereof.

6. The tank according to any one of claims 1 to 5, characterized in that at least one polyurea-based protective layer does not contain a flame retardant which is a swelling agent.

7. The tank according to any one of claims 1 to 6, characterized in that at least one polyurea-based protective layer comprises at least one additive selected from wetting agents such as UV absorbers, light stabilizers, antioxidants, dispersants, surfactants, plasticizers, defoamers, and shock absorbers.

8. A tank according to any one of claims 1 to 7, comprising at least one cylindrical central portion and two dome-shaped ends, wherein a protective covering covers the cylindrical central portion of the tank.

9. A tank according to any one of claims 1 to 8, comprising at least one cylindrical central portion and two dome-shaped ends, wherein at least one polyurea-based layer of protective covering covers the ends of the tank.

10. A tank according to any one of claims 1 to 9, characterized in that the curing agents for each polyurea-based layer are interchangeable or identical.

11. A tank according to any one of claims 1 to 10, characterized in that at least one curing agent is selected from an α-hydro-ω-hydroxypoly[oxy(methyl-1,2-ethanediyl)] polymer having 1,1'-methylenebis(isocyanatobenzene), a reaction mass of 4,4'-methylenediphenyl diisocyanate (MDI) and o-(p-isocyanatobenzyl)phenyl isocyanate, 4,4'-methylenediphenyl diisocyanate (MDI), and an oligomer of 4,4'-methylenediphenyl diisocyanate (MDI).

12. The tank according to any one of claims 1 to 11, characterized in that at least one polyurea-based layer is obtained from a resin selected from the group consisting of polyoxypropylenediamine, diethylmethylbenzenediamine, glyceryl poly(oxypropylene)triamine, polyalkylamine, and polyarylamine, and at least one polyurea-based layer is obtained from a resin selected from the group consisting of diethylmethylbenzenediamine and oleylamine derivatives.

13. A vehicle comprising the tank according to any one of claims 1 to 12.

14. a) The process of obtaining the mandrel, b) A step of wrapping a composite reinforcing structure around at least a portion of the mandrel in order to obtain a hollow body, c) A step of forming a protective coating on at least a portion of the surface of a composite reinforced structure, c1) A step of depositing a mixture (D) of at least one resin and at least one curing agent as defined in any one of claims 1 to 13 onto at least a portion of a composite reinforced structure, wherein the stoichiometric ratio of the resin to the curing agent is 2:1 to 1:2, and a step of polymerization of the mixture (D) to obtain a first polyurea-based protective layer. c2) A step of depositing a mixture (I) of at least one resin, at least one curing agent, and at least one flame retardant as defined in any one of claims 1 to 13 onto at least a portion of the surface of a hollow body coated with a protective layer obtained from step c1), wherein the stoichiometric ratio of the resin to the curing agent is 2:1 to 1:2, preferably 1:1; and a step of polymerizing the mixture (I) to obtain a second polyurea-based protective layer, wherein at least one resin of the mixture (D) is different from at least one resin of the mixture (I), comprising the steps of forming and A method for preparing a tank according to any one of claims 1 to 12, characterized by including the following:

15. a) The process of obtaining the mandrel which is the liner, b) A step of wrapping a composite reinforcing structure around at least a portion of the liner in order to obtain a hollow body, c) A step of forming a protective coating on at least a portion of the surface of a composite reinforced structure, c1) A step of depositing a mixture (D) of at least one resin and at least one curing agent as defined in any one of claims 1 to 14 onto at least a portion of a composite reinforced structure, wherein the stoichiometric ratio of the resin to the curing agent is 2:1 to 1:2, and a step of polymerization of the mixture (D) to obtain a first polyurea-based protective layer. c2) A step of depositing a mixture (I) of at least one resin, at least one curing agent, and at least one flame retardant as defined in any one of claims 1 to 14 onto at least a portion of the surface of a hollow body coated with a protective layer obtained from step c1), wherein the stoichiometric ratio of the resin to the curing agent is 2:1 to 1:2, preferably 1:1; and a step of polymerizing the mixture (I) to obtain a second polyurea-based protective layer, wherein at least one resin of the mixture (D) is different from at least one resin of the mixture (I), comprising the steps of forming and A method for preparing a tank according to claim 14, characterized by including the following.

16. A method for preparing a tank according to claim 14 or 15, characterized in that steps c1 and c2 are carried out in succession, and a protective layer of polyurea base obtained from mixture (I) is on the outside of the coating.

17. A method for preparing a tank according to any one of claims 14 to 16, characterized in that at least one additional coating step of a mixture of at least one resin and at least one curing agent is performed between step c1) and step c2).

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