Gastight container

Abstract

The invention relates to a gastight, pressure-resistant storage and/or transport container ( 10 ) for low-molecular, reactive filling media, especially for hydrogen, oxygen, air, methane and/or methanol. Said container has a high filling pressure and is embodied in an essentially rotationally symmetric manner, having at least one connector cap ( 15 ) with a sealing device ( 16 ). The wall ( 12 ) of the container is essentially comprised of a thermoplastic synthetic material having at least one diffusion barrier ( 18, 19 ) system and/or a diffusion barrier and anti-corrosion system ( 18, 19 ). In order to offer protection for hydrogen and oxygen containers, the diffusion barrier system can be embodied in the form of at least one compact layer and/or can contain finely dispersed, distributed reactive nanoparticles ( 18 ) in the wall ( 12 ) of the container, in at least one composite film ( 28 ) and/or in at least one diffusion barrier layer ( 18 ).

1 . Gastight, pressure-resistant storage and/or transport container ( 10 ) for low-molecular-weight reactive filling media, in particular for hydrogen, oxygen, air, methane and/or methanol, with a high filling pressure, which container( 10 ) is designed substantially rotationally symmetrical and has at least one connection cap ( 14 ) with a sealing device ( 16 ), characterised in that 
 the container wall ( 12 ) in essence comprises a thermoplastic with at least one diffusion barrier system ( 18 ,  19 ) or a diffusion barrier and anticorrosion system ( 18 , 19 ).    
     
     
         2 . Container ( 10 ) in accordance with  claim 1 , characterised in that it is designed for a filling pressure of at least 150 bar, preferably at least 250 bar, and the container wall ( 12 ) comprises in essence polyethylene, polypropylene, acetyl butadiene styrene, polyamide or a polyester and is optionally also reinforced.  
     
     
         3 . Container ( 10 ) in accordance with  claim 1  or  claim 2 , characterised in that the entire surface of the diffusion barrier ( 18 ,  19 ) or diffusion barrier and anticorrosion system ( 18 ,  19 ) is formed as at least one compact layer, the thickness of which is preferably at the most approximately 500 μm, in particular at most approximately 20 μm, or in the case of deposited or vapour-deposited thin layers preferably 10-600 nm, in particular up to 100 nm.  
     
     
         4 . Container ( 10 ) in accordance with any of  claims 1  to  3 , characterised in that depending on the aggressivity and permeation ability of the filling substance ( 20 ) and the external atmosphere ( 24 ), the diffusion barrier layers ( 18 ) are arranged inside, outside and/or in the container wall itself ( 12 ).  
     
     
         5 . Container ( 10 ) in accordance with any of  claims 1  to  4 , characterised in that as a diffusion barrier layer ( 18 ), a prefabricated metal film ( 26 ) is applied or inserted, preferably as a metal-plastic composite film ( 26 ,  28 ) or a pure plastic composite film, or a ceramic, boronic, silicic and/or metal-containing layer, also a layer protected with a plastic layer, or a purely plastic layer is applied.  
     
     
         6 . Container ( 10 ) in accordance with  claim 5 , characterised in that a bag of a metal and plastic composite film ( 26 ,  28 ) cut to the internal dimensions of the container ( 10 ) or a pure plastic composite film with one or two openings accordingly is inserted in the container ( 10 ) and lies against the inside of the container wall ( 12 ) and/or a composite plastic film welded to size is applied on the outside of the container wall ( 12 ).  
     
     
         7 . Container ( 10 ) in accordance with any of  claims 1  to  4 , characterised in that a plasma-polymerised, apolar or polar organic diffusion barrier layer ( 18 ) on a hydrocarbon base is applied to the inside and/or outside the container wall ( 12 ).  
     
     
         8 . Container ( 10 ) in accordance with any of  claims 1  to  7 , characterised in that the diffusion barrier layer ( 18 ) is deposited on a previously plasma-treated and/or polished container wall ( 12 ).  
     
     
         9 . Container ( 10 ) in accordance with any of  claims 1  to  8 , characterised in that the diffusion barrier system ( 19 ) comprises finely dispersed passive or reactive nanoparticles ( 19 ) in the container wall ( 12 ), in at least one composite film ( 26 ,  28 ) and/or in at least one diffusion barrier layer ( 18 ) for adsorption of or reaction with permeating gas, which nanoparticles ( 19 ) preferably comprise titanium, palladium, iron, aluminium, magnesium, Mg 2 Ni, TiC, TiO 2 , Ti 3 Al, TiN, Ti 2 Ni, LaNi 5 H 6 , graphite, sheet silicate and/or carbon-containing nanotubes.  
     
     
         10 . Container ( 10 ) in accordance with  claim 9 , characterised in that the nanoparticles ( 19 ) are embedded in a matrix, in particular reactive Ti or passive TiN nanoparticles in a Si 3 N 4  matrix or passive TiO 2  nanoparticles in a SiO 2  matrix.