摘要:
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.
摘要:
The present invention relates to the use for storing or transporting chemicals of a structure comprising an inner layer in contact with the fluid to be stored or transported, consisting of a fluoropolymer onto which an unsaturated monomer has been grafted by irradiation and, directly attached to the latter, a polyolefin outer layer. According to a variant, the structure comprises a fluoropolymer, preferably PDVF, layer placed beside the radiation-grafted fluoropolymer. The invention also relates to a structure having a central layer consisting of a radiation-grafted fluoropolymer and, directly attached to the latter, a polyolefin outer layer and a polyolefin inner layer. The polyolefin inner layer is the layer in contact with the chemicals. According to a variant, the radiation-grafted fluoropolymer layer is replaced with a layer of a blend of a fluoropolymer, preferably PVDF, and of a radiation-grafted fluoropolymer.
摘要:
The present invention relates to a method for radiation grafting a compound by irradiation, that can be grafted onto a fluoropolymer, so as to prevent destabilization of the fluorinated polymer. Said method comprises the following steps: a) the fluoropolymer is mixed in the melted state thereof with a graftable compound; b) the mixture obtained in a) is converted into films, plates, granulates or powder; c) the products from step b) are subjected to photonic (γ) or electronic (β) irradiation in a dose of between 0.5 and 15 Mrad; and d) optionally, the products from step c) are washed and/or a degassed. According to said method, a stabilizing agent is added to the fluorinated polymer. Said stabilizing agent can be an antioxidant, a graftable metal salt, or a combination of the two. The invention also relates to structures comprising at least one layer of said mixtures and at least one layer of another material, and to the use of said structures to obtain a barrier effect. Said structures act as a barrier to a plurality of fluids, especially to petrol and to air-conditioning fluids, and can take the form of bottles, tanks, containers, pipes, and all kinds of recipients. They can also be transformed into films used to produce packaging.
摘要:
The present invention relates to a method for the radiation grafting of a compound that can be grafted onto a fluoropolymer, so as to prevent destabilization of the fluoropolymer, comprising the following steps: a) the fluoropolymer is melt-blended with a graftable compound; b) the blend obtained at a) is formed into films, sheets, granules or powder; c) the products from step b) are subjected to photon (γ) or electron (β) irradiation with a dose of between 0.5 and 15 Mrad; and d) optionally, the products from step c) are subjected to a washing and/or a degassing operation, and in which a stabilizer is blended into the fluoropolymer. The stabilizer may be an antioxidant, a graftable metal salt or else a combination of the two. The invention also relates to structures comprising at least one layer of these blends and at least one layer of another material. The invention also relates to the use of these structures in order to obtain a barrier effect. These structures form a barrier to many fluids and in particular to petrol and to air-conditioning fluids. These structures may be made in the form of bottles, tanks, containers, pipes, hoses and receptacles of all kinds. They may also be converted into films from which packaging is made.
摘要:
The present invention relates to a process for grafting an unsaturated monomer onto a fluoropolymer, having the steps of: a) melt blending the fluoropolymer with the unsaturated monomer; b) forming the blend obtained in a) into films, sheets, granules or powder; c) exposing the products from step b), in the absence of air, to photon (γ) or electron (β) irradiation with a dose of between 1 and 15 Mrad; and d) optionally treating the product obtained at c) in order to remove all or part of the unsaturated monomer that has not been grafted onto the fluoropolymer. Structures made with these materials are barriers to many fluids and in particular to petrol and to air-conditioning fluids and may be formed into bottles, tanks, containers, pipes, hoses and vessels of all sorts. They may also be converted into films with which packaging is made.
摘要:
The present invention relates to a process for grafting an unsaturated monomer onto a fluoropolymer, having the steps of: a) melt blending the fluoropolymer with the unsaturated monomer; b) forming the blend obtained in a) into films, sheets, granules or powder; c) exposing the products from step b), in the absence of air, to photon (y) or electron (β) irradiation with a dose of between 1 and 15 Mrad; and d) optionally treating the product obtained at c) in order to remove all or part of the unsaturated monomer that has not been grafted onto the fluoropolymer. Structures made with these materials are barriers to many fluids and in particular to petrol and to air-conditioning fluids and may be formed into bottles, tanks, containers, pipes, hoses and vessels of all sorts. They may also be converted into films with which packaging is made.
摘要:
The present invention relates to a process for oxidizing a fluoropolymer, comprising the steps of: a) forming a fluoropolymer is into a film, a sheet, granules or powder; b) exposing the products from step a), in the presence of oxygen, to photon (γ) or electron (β) irradiation with a dose of between 1 and 15 Mrad; and c) optionally treating the product obtained in b) in order to remove all or some of the by-product impurities. The oxidized fluoropolymer thus obtained may be used as such or in a blend with at least one polymer. Structures comprising at least one layer of this oxidized fluoropolymer and at least one layer of another material may be formed into bottles, tanks, containers, pipes, hoses and vessels of all sorts. They may also be converted into films with which packaging is made. The invention also relates to the oxidized fluoropolymer.
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 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 invention relates to a copolymer of VDF and at least one monomer that is copolymerizable with VDF, having a VDF weight content of at least 50%, preferably at least 75%, onto which at least one unsaturated polar monomer is radiation grafted, characterized in that the VDF copolymer has, before grafting, the following characteristics: a crystallization temperature Tc (measured by DSC according to the standard ISO 11357-3) ranging from 50 to 120° C., preferably from 85 to 110° C.; a yield strength σY ranging from 10 to 40 MPa, preferably from 10 to 30 MPa; and a melt viscosity η (measured with a capillary rheometre at 230° C. and 100 s−1) ranging from 100 to 1500 Pa·s, preferably from 400 to 1200 Pa·s. The invention also relates to a blend comprising this modified copolymer and a PVDF.This modified copolymer or the blend may be combined with a thermoplastic polymer, an elastomer or an inorganic material.