摘要:
The present invention relates to a multilayer tube comprising, in its radial direction from the outside inwards: an outer layer formed from a polyamide, a layer formed from a copolyamide, a layer formed from an EVOH, a layer formed from a copolyamide, an inner layer formed from a polyamide, the layers being successive and adhering to one another in their respective contact region. Advantageously, the inner layer is formed by a compound based on a polyamide and electrically conducting carbon black, producing a surface resistivity of less than 106 Ω/?. The outside diameter of these tubes may range from 6 to 110 mm and the wall thickness may be from 0.5 to 5 mm. Advantageously, the petrol tube according to the invention has an outside diameter ranging from 6 to 12 mm and a total wall thickness of 0.36 mm to 1.95 mm, namely: a thickness of 50 to 700 μm for the polyamide outer layer, a thickness of 10 to 150 μm for the copolyamide layers, a thickness of 10 to 200 μm for the EVOH layer, a thickness of 100 to 500 μm for the polyamide inner layer possibly filled with electrically conducting carbon black. The tube of the present invention has a very low permeability to petrol, particularly to hydrocarbons and their additives, and in particular to alcohols, such as methanol and ethanol, or to ethers, such as MTBE or ETBE. These tubes also have good resistance to engine lubrication oils and fuels.
摘要:
The present invention relates to a multilayer structure comprising the following successive layers: a polyamide or HDPE (high-density polyethylene) layer; a tie layer; an impact-modified EVOH layer; optionally, a tie layer; and a polyamide or polyamide/polyolefin blend or polyolefin layer, the latter layer possibly containing fillers in order to make it antistatic; and such that the impact-modified EVOH layer is a blend based on EVOH and at least one modifier chosen from: a) functionalized ethylene/alkyl (meth)acrylate copolymers; b) products resulting from the reaction of (i) a copolymer of ethylene and of an unsaturated monomer X grafted or copolymerized with (ii) a polyamide; c) blends of a) and b); d) polyamides, preferably PA-6; e) blends of a) and d); f) elastomers, preferably EPR, EPDM and NBR, these elastomers possibly being functionalized; g) S-B-M triblocks; h) triblocks formed from a poly(butyl acrylate) block between two PMMA blocks; and i) linear or star S-B-S block copolymers, these optionally being hydrogenated (they are then denoted by S-EB-S).
摘要:
The present invention relates to a multilayer tube comprising, in its radial direction from the outside inwards: a polyamide outer layer (1); an inner layer (2) of a composition comprising, the total being 100%, 5 to 30% by weight of a blend (A) comprising: a polyethylene carrying epoxy functional groups, an impact modifier chosen from elastomers and very low-density polyethylenes, the said impact modifier being completely or partly functionalized; 95 to 70% by weight of a blend (B) comprising: a fluoropolymer (B1), a functionalized fluoropolymer (B2), the proportion of (B2) being between 1 and 80% by weight of (A)+(B), the layers being successive and adhering to one another in their respective contact region. The inner layer is the layer in contact with the fluid being transported. The layer (2) may be conductive. It is also possible to place a polyamide layer (3) beside the layer (2), which layer becomes the inner layer. The tube of the present invention has a very low permeability to petrol, particularly to hydrocarbons and to their additives, in particular alcohols such as methanol and ethanol, or even ethers such as MTBE or ITBE. These tubes also exhibit good resistance to fuels and to lubricating oils for engines. This tube exhibits very good mechanical properties at low temperature and at high temperature. The invention also relates to the use of these tubes for transporting petrol.
摘要:
The present invention relates to a structure successively comprising: a layer of barrier polymer, a tie layer comprising, the total being 100%: 1 to 80% of at least one polyethylene carrying epoxy functional groups, 99 to 20% of at least one viscous polymer compatible with the polyethylene carrying epoxy functional groups, a polyethylene layer, and optionally another tie layer and a layer of barrier polymer, the layers adhering in their respective contact zones. This structure is of use in preparing devices for the storage or transfer of fluids, in particular in motor vehicles. The invention also relates to these devices. These devices can be pipes, tanks, bottles or containers in which the layer of barrier polymer is in contact with the stored or transported fluid. These structures can comprise other layers composed of other materials.
摘要:
The present invention relates to a multilayer hose for compressed air comprising, in this order:an outer layer (1) made of polyamide,optionally an intermediate layer (2) of a polymer having a flexural modulus of less than 500 MPa,an inner layer (3) of a polymer having a flexural modulus of greater than 1100 MPa, the inner layer (3) being in contact with the compressed air.
摘要:
The present invention relates to a multilayer hose for compressed air comprising, in this order: an outer layer (1) made of polyamide, optionally an intermediate layer (2) of a polymer having a flexural modulus of less than 500 MPa, an inner layer (3) of a polymer having a flexural modulus of greater than 1100 MPa, the inner layer (3) being in contact with the compressed air.
摘要:
The present invention relates to a multilayer tube comprising, in succession in its radial direction from the outside inwards: a nylon-11 or nylon-12 polyamide outer layer (1); a tie layer (2); an optional EVOH layer (3); an optional layer (4) made of PA-6 or a PA-6/polyolefin blend having a PA-6 matrix and polyolefin dispersed phase; an inner layer (5) based on PA-6 in contact with the transported fluid, comprising by weight, the total being 100%: 40 to 65% (advantageously 45 to 60%) of PA-6, 1 to 20% (advantageously 5 to 15%) of HDPE, 10 to 30% (advantageously 15 to 25%) of at least one polymer P1 chosen from impact modifiers and polyethylenes, either or both of the HDPE and the P1 being completely or partly functionalized and 5 to 30% (advantageously 15 to 30% and preferably 17 to 24%) of an electrically conductive material. The tube of the present invention has a very low permeability to petrol, particularly to hydrocarbons and to their additives, in particular alcohols such as methanol and ethanol or else ethers such as MTBE or ETBE. These tubes also have a very good resistance to fuels and lubricating oils for engines.This tube has very good mechanical properties at low temperature or at high temperature. The invention also relates to the use of these tubes for transporting petrol.
摘要:
The present invention relates to a multilayer tube comprising, in its radial direction from the outside inwards: an outer layer (1) made of a polyamide, a tie layer (2) comprising, by weight: 1 to 50% of an impact modifier chosen from elastomers and very low density polyethylene, the said impact modifier being completely or partly functionalized, per 99 to 50% of at least one copolyamide 6/12 respectively, an optional EVOH layer (3), optionally a tie layer, an inner layer (4) made of PA 12, PA 6 or a PA 6-polyolefin compound with a PA 6 matrix and a dispersed polyolefin phase, the layers being successive and adhering to one another in their respective contact zones. The inner layer is the layer in contact with the fluid being transferred. According to one embodiment of the invention, the inner layer (4) contains an electrically conducting material, producing a surface resistivity of less than 106Ω. According to another embodiment of the invention, the inner layer (4) contains essentially no electrically conducting material and the tube includes a layer (4a) that adheres to the layer (4), this layer is made of polyamide and contains an electrically conducting material producing a surface resistivity of less than 106Ω This layer (4a) becomes the inner layer. These tubes may have an outside diameter of 6 to 110 mm and a thickness of around 0.5 to 5 mm.
摘要:
The present invention relates to a structure successively comprising: a first layer of high density polyethylene (HDPE), a tie layer, a second layer of EVOH or of a blend based on EVOH, optionally a tie layer, a third layer of a blend comprising, by weight, the total being 100%: 50 to 90% of polyamide (A) having a conversion temperature of at most 230° C., 1 to 30% of high density polyethylene (HDPE), 5 to 30% of an impact modifier chosen from elastomers and very low density polyethylenes, at least one of the HDPE and of the impact modifier being functionalized, in all or part, the layers being coextrudable. The present invention also relates to devices for the transfer or storage of fluids and more particularly to pipes, tanks, conduits, bottles and containers composed of the above structure in which the layer of the blend of polyamide (A) and of HDPE is in direct contact with the fluid present or transported