BE729003A - PROCESS FOR THE MANUFACTURING OF MOLDED INSULATING PARTS AND MOLDED INSULATING PARTS MANUFACTURED BY THIS PROCESS - Google Patents
PROCESS FOR THE MANUFACTURING OF MOLDED INSULATING PARTS AND MOLDED INSULATING PARTS MANUFACTURED BY THIS PROCESSInfo
- Publication number
- BE729003A BE729003A BE729003DA BE729003A BE 729003 A BE729003 A BE 729003A BE 729003D A BE729003D A BE 729003DA BE 729003 A BE729003 A BE 729003A
- Authority
- BE
- Belgium
- Prior art keywords
- resin
- mold
- rotating device
- insulating parts
- sep
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/40—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes epoxy resins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/04—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould
- B29C41/06—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould about two or more axes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/22—Making multilayered or multicoloured articles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2063/00—Use of EP, i.e. epoxy resins or derivatives thereof, as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2096/00—Use of specified macromolecular materials not provided for in a single one of main groups B29K2001/00 - B29K2095/00, as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/0058—Liquid or visquous
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/16—Fillers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
- B29L2031/3412—Insulators
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Description
<Desc/Clms Page number 1>
BREVET D'INVENTION PROCEDE DE FABRICATION DE PIECES ISOLANTES MOULEES ET PIECES ISOLANTES MOULEES FABRIQUEES SUI-
VANT CE PROCEDE.
Dans l'industrie électrique, des pièces isolan- tes moulées, notamment en résine epoxy, sont bien connues et appliquées aussi bien en basse qu'en haute tension, dans des installations à l'intérieur, et même à l'extéri- eur. Les pièces moulées en résine epoxy chargée, placées à l'extérieur, subissent une altération superficielle après un certain temps d'exposition aux intempéries. Pour des tensions électriques inférieures à 20 kV et pour des gradients de potentiel normaux, ce phénomène ne provoque
<Desc/Clms Page number 2>
aucune perturbation. Mais pour des tensions supérieures à
20 kV, l'altération superficielle des pièces isolantes don- ne lieu à des cheminements de courants électriques aux en- droits où le gradient de potentiel est élevé.
L'invention a pour but de remédier à ce dernier inconvénient. Il existe déjà des résines, par exemple des résines cycloaliphatiques qui sont beaucoup plus résistan- tes aux rayons ultra-violets que les résines epoxy, mais @ qui par contre présentent des propriétés mécaniques moins bonnes et qui en outre permettent difficilement le moulage de pièces dépassant environ 50 Kg. Or, les pièces isolan- tes pour installations à haute tension sont parfois plus lourdes que 50 Kg.
L'invention permet de se servir de ces résines aux propriétés connues même pour des pièces isolantes beau- coup plus lourdes que 50 Kg. Le procédé de fabrication de pièces isolantes moulées suivant l'invention est caractéri- sé en ce qu'on préchauffe un moule au moins à la tempéra- ture de fusion d'une résine, qu'on introduit dans le moule une quantité d'une première résine synthétique liquide, suffisante pour recouvrir d'une épaisseur prédéterminée les parois du moule, qu'on place le moule sur un dispositif tournant sur lequel il est tourné dans tous les sens afin de faire recouvrir les parois intérieures du moule par la résine liquide, qu'on porte le moule pendant qu'il tourne à la température de gélification de la dite résine,
qu'on arrête le dispositif tournant dès que la résine est
<Desc/Clms Page number 3>
gélifiée, qu'on coule à l'intérieur du moule une deuxième résine et qu'on porte le tout à une température suffisamment élevée pour provoquer le durcissement à la fois.de la pre- mière et de la deuxième résine:
L'invention est expliquée ci-après par rapport à un exemple d'une forme d'exécution en se référant au dessin annexé.
Un moule 1 pour un isolateur support est préchauf-- fé et placé sur un dispositif tournant. Ensuite il est rem- pli d'une quantité d'une résine cycloaliphatique préalable- ment fondue constitué par exemple par:
EMI3.1
<tb> Résine <SEP> cycloaliphatique <SEP> 100 <SEP> parties <SEP> en <SEP> poids
<tb>
<tb>
<tb> Anhydride <SEP> hexahydrophtalique <SEP> 80 <SEP> parties <SEP> en <SEP> poids
<tb>
<tb> Alumine <SEP> hydratée <SEP> 75 <SEP> parties <SEP> en <SEP> poids
<tb>
<tb>
<tb> Stabilisants <SEP> et <SEP> antioxydants <SEP> 22 <SEP> parties <SEP> en <SEP> poids
<tb>
La charge d'alumine hydratée améliore surtout la résistance au cheminement.
Le dispositif tournant est composé d'un plateau support 2, d'un premier axe rotatif 3 et d'un deuxième axe rotatif 4. Les deux axes 3 et 4 sont entraînés avec des vitesses différentes déterminées par des roues à en- grenages coniques 5 et 6. Lors de la double rotation impri- mée au moule par le dispositif tournant, celui-ci est tour- né dans tous les sens de façon que les parois intérieures du moule sont recouvertes d'une couche de résine d'épais- seur déterminée par la quantité de résine introduite dans le moule. Le dispositif tournant est placé de préférence à
<Desc/Clms Page number 4>
l'intérieur d'une armoire chauffante 7 dans laquelle est maintenue une température de 135 C. Cette disposition permet de préchauffer le moule en début d'opération lorsqu'on le fixe sur le dispositif tournant.
Ensuite la température de 135 C est suffisante pour provoquer la gélification de la résine cycloaliphatique.
Il importe d'interrompre le procédé au moment où une gélification suffisante de la première résine est at- teinte et avant la polymérisation. A ce moment, on coule à l'intérieur du moule garni de la première résine, une deu- xième résine, par exemple une résine epoxy chargée de fari- ne de quartz liquéfiée par chauffage et on place le moule dans un four de durcissement où la polymérisation des deux @ résines s'achève, en assurant en même temps une liaison in- time entre les deux résines. Le démoulage peut se faire soit avant soit après la polymérisation complète des résines.
<Desc / Clms Page number 1>
PATENT FOR THE MANUFACTURING OF MOLDED INSULATING PARTS AND MOLDED INSULATING PARTS MANUFACTURED SUI-
BEFORE THIS PROCESS.
In the electrical industry, molded insulating parts, in particular in epoxy resin, are well known and applied both at low and high voltage, in indoor installations, and even outdoors. The parts molded in filled epoxy resin, placed outside, undergo a surface deterioration after a certain time of exposure to the elements. For electrical voltages below 20 kV and for normal potential gradients, this phenomenon does not cause
<Desc / Clms Page number 2>
no disturbance. But for voltages greater than
20 kV, the superficial alteration of the insulating parts gives rise to the flow of electric currents in places where the potential gradient is high.
The object of the invention is to remedy this latter drawback. There are already resins, for example cycloaliphatic resins which are much more resistant to ultraviolet rays than epoxy resins, but which on the other hand have poorer mechanical properties and which, moreover, make it difficult to mold parts exceeding. approximately 50 Kg. However, insulating parts for high voltage installations are sometimes heavier than 50 Kg.
The invention makes it possible to use these resins with known properties even for insulating parts much heavier than 50 kg. The method of manufacturing molded insulating parts according to the invention is characterized in that a preheating is done. mold at least at the melting temperature of a resin, which is introduced into the mold a quantity of a first liquid synthetic resin, sufficient to cover the walls of the mold with a predetermined thickness, which one places the mold on a rotating device on which it is turned in all directions in order to cover the interior walls of the mold with the liquid resin, that the mold is carried while it rotates at the gelation temperature of said resin,
stop the rotating device as soon as the resin is
<Desc / Clms Page number 3>
gelled, that a second resin is poured inside the mold and the whole is brought to a temperature high enough to cause hardening of both the first and the second resin:
The invention is explained below with respect to an example of an embodiment with reference to the accompanying drawing.
A mold 1 for a support insulator is preheated and placed on a rotating device. Then it is filled with a quantity of a previously molten cycloaliphatic resin consisting for example of:
EMI3.1
<tb> Cycloaliphatic <SEP> resin <SEP> 100 <SEP> parts <SEP> in <SEP> weight
<tb>
<tb>
<tb> Hexahydrophthalic anhydride <SEP> <SEP> 80 <SEP> parts <SEP> in <SEP> weight
<tb>
<tb> Alumina <SEP> hydrated <SEP> 75 <SEP> parts <SEP> in <SEP> weight
<tb>
<tb>
<tb> Stabilizers <SEP> and <SEP> antioxidants <SEP> 22 <SEP> parts <SEP> in <SEP> weight
<tb>
The hydrated alumina filler especially improves the resistance to tracking.
The rotating device is composed of a support plate 2, a first rotary axis 3 and a second rotary axis 4. The two axes 3 and 4 are driven at different speeds determined by bevel gear wheels 5 and 6. During the double rotation imparted to the mold by the rotating device, the latter is turned in all directions so that the interior walls of the mold are covered with a layer of thick resin. determined by the amount of resin introduced into the mold. The rotating device is preferably placed at
<Desc / Clms Page number 4>
inside a heating cabinet 7 in which a temperature of 135 ° C. is maintained. This arrangement makes it possible to preheat the mold at the start of the operation when it is fixed on the rotating device.
Then the temperature of 135 C is sufficient to cause gelation of the cycloaliphatic resin.
It is important to interrupt the process when sufficient gelation of the first resin is reached and before polymerization. At this moment, a second resin, for example an epoxy resin filled with quartz flour liquefied by heating, is poured inside the mold filled with the first resin and the mold is placed in a curing oven where the polymerization of the two resins is completed, ensuring at the same time an intimate bond between the two resins. Demoulding can be done either before or after the complete polymerization of the resins.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE729003 | 1969-02-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
BE729003A true BE729003A (en) | 1969-08-27 |
Family
ID=3854354
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE729003D BE729003A (en) | 1969-02-27 | 1969-02-27 | PROCESS FOR THE MANUFACTURING OF MOLDED INSULATING PARTS AND MOLDED INSULATING PARTS MANUFACTURED BY THIS PROCESS |
Country Status (1)
Country | Link |
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BE (1) | BE729003A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0160298A2 (en) * | 1984-05-01 | 1985-11-06 | Old Town Canoe | Improved rotational molding method |
US4913944A (en) * | 1984-05-01 | 1990-04-03 | Old Town Canoe Company | Boat hull |
WO2004065093A1 (en) * | 2003-01-24 | 2004-08-05 | Almar Packaging Solutions (Pty) Limited | A rotational moulding machine |
-
1969
- 1969-02-27 BE BE729003D patent/BE729003A/en unknown
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0160298A2 (en) * | 1984-05-01 | 1985-11-06 | Old Town Canoe | Improved rotational molding method |
EP0160298A3 (en) * | 1984-05-01 | 1987-08-26 | Old Town Canoe | Improved rotational molding method |
US4913944A (en) * | 1984-05-01 | 1990-04-03 | Old Town Canoe Company | Boat hull |
WO2004065093A1 (en) * | 2003-01-24 | 2004-08-05 | Almar Packaging Solutions (Pty) Limited | A rotational moulding machine |
US7306443B2 (en) | 2003-01-24 | 2007-12-11 | Almar Packaging Solutions (Pty) Limited | Rotational moulding machine |
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