Process for impregnating electrical coils, and selected...

C - Chemistry – Metallurgy – 08 – L

Patent

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C08L 63/02 (2006.01) C08K 3/00 (2006.01) C08L 63/00 (2006.01) C08L 63/04 (2006.01) C09D 163/02 (2006.01) C09D 163/04 (2006.01) H01B 3/40 (2006.01) H01F 41/12 (2006.01)

Patent

CA 2242053

A process for impregnating an electrical coil which comprises a winding comprising two or more layers consisting of more than one turn of an electrically conducting wire-form material with a polymer material which electrically insulates the individual turns of the wire-form material from one another with the aid of a thermally curable epoxy resin composition, which composition is solid at room temperature and comprises the following constituents: (a) an epoxy resin which is solid at room temperature, selected from (a1) polyglycidyl ethers based on novolaks; (a2) diglycidyl ethers based on bisphenols, and (a3) mixtures of more than one of components (a1) and (a2); (b) a crosslinking agent for component (a); (c) a suitable accelerator for the reaction of component (a) and component (b); (d) from 15 to 70 percent by weight, based on the overall weight of the composition, of filler selected from (d1) calcium carbonate, (d2) quartz flour, (d3) wollastonite whose particles have an average ratio of length to cross-section which is less than 5:1; (d4) mixtures of components (d1), (d2) and (d3) and (d5) mixtures of components (d1), (d2), (d3) and (d4) with other inorganic fillers; and which also preferably comprises (e) from 10 to 60 percent by weight, based on the overall weight of the composition, of inorganic reinforcements in the form of acicular or fibrillar particles with a length of from 0.05 to 2.5 mm which have an average ratio of length to cross-section of 5:1 or more, the overall amount of component (d) and (e) being not more than 80 percent by weight, based on the overall weight of the composition, inter alia does away with the need to use sacrificial moulds and reduces by a multiple the curing time required for completing the coating of the coils, reducing it to the region of a few minutes.

Méthode pour imprégner une bobine électrique, comprenant un enroulement constitué d'une ou de plusieurs couches, composé de plus d'une spire d'un matériau conducteur formant un câble, avec un matériau polymérique isolant électriquement les unes des autres les spires individuelles du matériau formant le câble, grâce à une composition de résine époxyde thermoréticulable, laquelle est solide à la température de la pièce et renferme les constituants suivants : A) résine époxyde solide à la température de la pièce, choisie parmi (A1) des éthers polyglycidyliques à base de novolaques, (A2) des éthers de diglycidyle à base de bisphénols, (A3) des mélanges de plus d'un des constituants (A1) et (A2); B) un réticulant pour le constituant A; C) un accélérateur approprié pour la réaction du constituant A et du constituant B; D) 15 à 70 % en poids, basé sur le poids total de la composition, d'une charge choisie parmi du (D1) carbonate de calcium, de la (D2) farine de quartz, de la (D3) wollastonite, dont les particules présentent un rapport moyen longueur/section transversale inférieur à 5/1, des mélanges (D4) des constituants D1, D2 et D3, et des mélanges (D5) des constituants D1, D2, D3 et D4, avec d'autres charges minérales; E) de préférence, 10-60 % en poids, basé sur le poids total de la composition, de renforts minéraux sous forme de particules aciculaires ou fibrillaires, d'une longueur de 0.05-2,5 mm, présentant un rapport moyen longueur/section transversale de 5/1 ou plus, la quantité totale des constituants D et E ne dépassant pas 80 % en poids, basé sur le poids total de la composition. Parmi les avantages de cette méthode, il y a celui des moules qui ne sont plus perdus, et la réduction, par un facteur multiple, du temps de réticulation nécessaire pour parachever le revêtement des bobines, qui n'est plus que de quelques minutes.

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