Use of a hose based on an irradiation-grafted fluoropolymer for transporting petrol in a service station
The present invention relates to a hose having a layer consisting of a fluoropolymer onto which an unsaturated monomer has been irradiation-grafted and, a polyolefin outer layer. The hose is useful for transporting petrol in a service station. In one embodiment a fluoropolymer, preferably PDVF, layer is placed beside the irradiation-grafted fluoropolymer. The hose may consist of a irradiation-grafted fluoropolymer inner layer and a polyolefin outer layer, or multilayer hose with either a central irradiation-grafted fluoropolymer layer and polyolefin inner and outer layers, or a polyolefin central layer and irradiation-grafted fluoropolymer inner and outer layers. The irradiation-grafted fluoropolymer layer may be replaced with a layer of a blend of a fluoropolymer, preferably PVDF, and of an irradiation-grafted fluoropolymer. It may also be covered with a fluoropolymer.
1 . A hose having at least an inner and an outer layer comprising a layer consisting of a polyolefin and a layer consisting of a fluoropolymer onto which an unsaturated monomer has been irradiation-grafted.
2 . The hose according to claim 1 wherein said polyolefin layer is directly attached to said irradiation-grafted fluoropolymer.
3 . The hose of claim 2 wherein said inner layer consists of said fluoropolymer onto which an unsaturated monomer has been irradiation-grafted, and said outer-layer consists of said polyolefin.
4 . The hose according to claim I wherein a layer of a functionalized polyolefin having functional groups capable of reacting with the functional groups irradiation-grafted onto the fluoropolymer is placed between the irradiation-grafted fluoropolymer layer and the polyolefin layer.
5 . The hose according to claim 4 , in which the functional polyolefin is either an ethylene/unsaturated epoxide copolymer or a polyolefin grafted with an unsaturated epoxide.
6 . The hose according to claim 1 comprising a central layer consisting of a polyolefin and an irradiation-grafted fluoropolymer outer layer and an irradiation-grafted fluoropolymer inner layer.
7 . The hose according to claim 1 , wherein at least one irradiation-grafted fluoropolymer layer is replaced with a layer of a blend of a fluoropolymer and of an irradiation-grafted fluoropolymer.
8 . The hose according to claim 1 , in which at least one irradiation-grafted fluoropolymer layer is covered with a fluoropolymer layer.
9 . The hose according to claim 1 comprising a central layer consisting of an irradiation-grafted fluoropolymer inner layer and an irradiation-grafted fluoropolymer inner layer.
10 . The hose according to claim 1 wherein said irradiation-grafted fluoropolymer layer is replaced with a layer consisting of a blend of a fluoropolymer and an irradiation-grafted fluoropolymer.
11 . The hose according to claim 9 wherein said fluoropolymer comprises polyvinylidene fluoride.
12 . The hose according to claim 1 further comprising a fluoropolymer layer attached directed to the irradiation-grafted fluoropolymer.
13 . The hose according to claim 1 comprising a central layer consisting of an irradiation-grafted fluoropolymer and, directly attached thereto, a polyolefin outer layer and a polyolefin inner layer.
14 . The hose according to claim 1 , in which the unsaturated monomer possesses at least one C═C double bond and at least one polar functional group selected from the group consisting of a carboxylic acid, carboxylic acid salt, carboxylic acid anhydride, epoxide, carboxylic acid ester, silyl; carboxylic amide, hydroxyl, and isocyanate functional group.
15 . The hose according to claim 14 , in which the unsaturated monomer possesses only a single C═C double bond.
16 . The hose according to claim 14 , in which the unsaturated monomer is an unsaturated carboxylic acid anhydride.
17 . The hose according to claim 16 , in which the unsaturated monomer is maleic anhydride.
18 . The hose according to claim 14 , in which the unsaturated monomer is undecylenic acid or zinc, calcium or sodium undecylenates.
19 . The hose according to claim 1 , in which the inner layer is in contact with a fluid to be transported and further comprises carbon black, carbon nanotubes or any other additive capable of making it conductive in order to prevent the accumulation of static electricity.
20 . A process for transporting petrol in a service station in order to convey the fluid from the storage tank to the petrol dispenser and from the petrol dispenser into the customer's car of a hose comprising using a hose having at least an inner and an outer layer comprising a layer consisting of a polyolefin and a layer consisting of a fluoropolymer onto which an unsaturated monomer has been irradiation-grafted.