摘要:
The present invention relates to a PTC composition comprising, by weight, the total being 100%: A) 40 to 80% of PVDF; B) 0 to 40% (advantageously 10 to 40%) of an acrylic or styrene polymer; C) 0 to 40% of an epoxy resin; D) 0 to 60% of at least one metal oxide; E) 0 to 25% of a carbonaceous conductive filler D+E being equal to at least 10%. To prepare the composition of the invention, the various constituents are blended in such a way that (A) is in the melt state, then the product obtained is extruded, moulded or injection-moulded or else deposited on a substrate. Once the composition has been converted into an article, for example into a sheet or bar, it is provided with at least two electrodes that serve as the power lead-in and return, respectively. The composition may also be placed between two conducting plates that serve as the power lead-in and return, respectively.
摘要:
The present invention relates to a composition comprising, by weight, the total being 100%: A) 40 to 80% of PVDF; B) 10 to 40% of PMMA; and C) 10 to 40% of a conductive filler. This composition has a PTC effect and is advantageously used in the form of a film (paint) covering a substrate. The composition of the invention is dissolved in a solvent and then spread over a substrate and the solvent evaporated. The metal terminals for connection to the electrical circuit may be placed at the ends of the coating before or after application. The invention also relates to a composite, namely the substrate covered with the PTC composition described above.
摘要:
A fluid transport tube comprising at least an inner layer, an outer protective layer, and an intermediate temperature regulator device connected to a source of voltage and suitable for heating the transported fluid towards an equilibrium or reference temperature by using a positive temperature coefficient thermistor presenting electrical resistance that is automatically controlled by temperature and that is connected to the source of voltage via at least two conductor elements delivering the current needed for heating it, wherein each conductor element is a metal wire that is supported by a textile ply wound around the inner layer of the tube, and wherein said inner layer is based: on at least one elastomer; or on at least one thermoplastic elastomer selected from the group consisting of ionomers and olefin-based thermoplastic elastomers having a cross-linked elastomer phase.
摘要:
An oil-based masterbatch in the form of granules containing carbon nanotubes. Also, a method for preparing an oil-based masterbatch in the form of granules containing carbon nanotubes. Also, the use of an oil-based masterbatch in the form of granules containing carbon nanotubes for manufacturing an aqueous or organic viscoelastic fluid, intended for drilling in underground formations.
摘要:
The present invention relates to a masterbatch in agglomerated solid form comprising: a) carbon nanofibers and/or nanotubes and/or carbon black, the content of which is between 15 wt % and 40 wt %, preferably between 20 wt % and 35 wt %, relative to the total weight of the masterbatch; b) at least one solvent; c) at least one polymer binder, which represents from 1 wt % to 40 wt %, preferably from 2 wt % to 30 wt % relative to the total weight of the masterbatch. The present invention also relates to a concentrated masterbatch, characterized in that it is obtained by eliminating all or part of the solvent from the masterbatch described previously.It also relates to a process for preparing said masterbatches and to the uses of the latter, especially in the manufacture of an electrode or of a composite material for an electrode.
摘要:
A method for manufacturing a thermoplastic composition including: a polyester resin (c); a mixture including a copolymer (a) of an α-olefin and of a monomer having an ethylenic unsaturation and an epoxy function, as well as a core-shell compound (b); characterized in that said method includes a first step of manufacture the mixture of (a) and (b) by extrusion at a temperature at which the copolymer (a) is in the molten state and at a maximum temperature of 60 to 180° C.; a second step of manufacturing the thermoplastic composition by extrusion or by mixing the polyester resin (c) with the mixture of (a) and (b) produced in the first step.
摘要:
An oil-based masterbatch in the form of granules containing carbon nanotubes. Also, a method for preparing an oil-based masterbatch in the form of granules containing carbon nanotubes. Also, the use of an oil-based masterbatch in the form of granules containing carbon nanotubes for manufacturing an aqueous or organic viscoelastic fluid, intended for drilling in underground formations.
摘要:
The present invention relates to a composite of carbon nanotubes and of graphenes in agglomerated solid form comprising: a) carbon nanotubes, the content of which represents from 0.1% to 50% by weight, preferably from 10% to 40% by weight relative to the total weight of the composite; b) graphenes, the content of which represents from 0.1% to 20% by weight, preferably from 1% to 10% by weight relative to the total weight of the composite; and c) a polymer composition comprising at least one thermoplastic polymer and/or one elastomer. The present invention also relates to a process for preparing said composite, its use for the manufacture of a composite product, and also to the various applications of the composite product.
摘要:
The invention relates to a method for producing a composite material, that comprises: a—preparing a carbon nanotube-based master mixture according to a method that comprises: mixing the carbon nanotubes in the form of a powder and at least one thermoplastic and/or elastomer polymer matrix in the form of a powder, the amount of carbon nanotubes representing from 2 to 30 wt % relative to the total weight of the powdery mixture; and implementing said mixture into an agglomerated solid physical form; and B—placing said master mixture into a thermoplastic and/or elastomer polymer mixture. The invention also relates to the use of the above master mixture for implementing said method.
摘要:
The subject of the present invention is a process for preparing a precomposite based on nanotubes, comprising bringing said nanotubes into contact with at least one given plasticizing agent.It also relates to a precomposite thus obtained, and to its use for conferring at least one electrical, mechanical and/or thermal property on a polymer material.It also relates to the use of a given plasticizer for improving the dispersion and/or mechanical properties and/or electrical conductivity and/or thermal conductivity of nanotubes in a polymer matrix.