EP0668112A1 - Process for prepararing molded objects surfaces to be electrostatically painted - Google Patents
Process for prepararing molded objects surfaces to be electrostatically painted Download PDFInfo
- Publication number
- EP0668112A1 EP0668112A1 EP93420434A EP93420434A EP0668112A1 EP 0668112 A1 EP0668112 A1 EP 0668112A1 EP 93420434 A EP93420434 A EP 93420434A EP 93420434 A EP93420434 A EP 93420434A EP 0668112 A1 EP0668112 A1 EP 0668112A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- drying
- oven
- primer
- parts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
- B05D1/045—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field on non-conductive substrates
Definitions
- the present invention relates to the preparation of parts made of composite materials and more particularly of thermosetting material obtained by injection or compression or made of laminated material, for application, on at least some of the surfaces of said parts of paints of lacquer type or metallizing base covered with varnish by electro-static process.
- polyester parts obtained by injection, compression or lamination are used. Such polyester parts are not completely homogeneous so that their surfaces to be painted are porous.
- the improvements which are the subject of the present invention aim to remedy these drawbacks and allow the production of a process for the preparation of parts made of composite materials, significantly eliminating appearance defects during application either '' primer, or finishing paint by the electro-static process.
- This process uses an epoxy resin sealant in the form of a two-component liquid.
- the product layer forms a screen on the surfaces to be painted to fill porosity, craters and other appearance defects.
- a layer of conductive primer intended to facilitate the application of topcoats by electro-static process, is associated with the putty product so as to allow the attachment of priming and finishing paints projected by electro-static process.
- the putty product based on epoxy resins can be that sold commercially under the name "EUROXY" and distributed by the company B.A.S.F.
- This product is a two-component liquid product.
- the primary conductive product may be that sold under the reference "3035113" by the company AKZO.
- the layer of conductive primer is applied directly to the layer based on epoxy resin without any drying thereof, that is to say according to what is known in the art as "wet on”. wet”.
- the pieces are then baked in an oven between 80 and 160 °.
- the application of the layer of epoxy resin and of the layer of primary conductive product could be reversed by depositing the latter first on the raw part which is degreased or not, then the product based on epoxy resin before drying of the primary conductive. The pieces are then baked in an oven between 80 ° and 160 °.
- the epoxy resin-based product is applied to the raw parts which have been degreased or not, this layer is hardened in an oven and then the layer of conductive primer is applied directly to that of epoxy resin polymerized in an oven between 80 and 160 and this new layer is hardened in an oven under the same conditions as above.
- drying-cooking operations can be carried out in a tunnel or in an oven at temperatures between 80 and 160 for 20 to 30 minutes.
- Another solution consists in applying directly, on the degreased or not degreased blank, a layer of conductive primer based on the aforementioned epoxy resin.
- the prepared piece is dried and baked in a tunnel or an oven at temperatures between 80 and 160 ° for 20 or 30 minutes.
Abstract
Description
La présente invention se réfère à la préparation de pièces en matériaux composites et plus particulièrement en matière thermo-durcissable obtenues par injection ou compression ou réalisées en matière stratifiée, en vue de l'application, sur au moins certaines des surfaces desdites pièces de peintures du genre laques ou base métallisantes recouvertes de vernis par procédé électro-statique.The present invention relates to the preparation of parts made of composite materials and more particularly of thermosetting material obtained by injection or compression or made of laminated material, for application, on at least some of the surfaces of said parts of paints of lacquer type or metallizing base covered with varnish by electro-static process.
On sait qu'on utilise de plus en plus, par exemple dans les pièces la carrosseries automobile, des pièces réalisées en matériaux composites, en remplacement d'éléments en tôle, du fait que leur prix de revient est plus bas et que leur poids est inférieur. On utilise en particulier des pièces en polyester obtenues par injection, par compression ou stratification. De telles pièces en polyester ne sont pas totalement homogènes de telle sorte que leurs surfaces à peindre sont poreuses.We know that we are using more and more, for example in auto body parts, parts made of composite materials, replacing sheet metal elements, because their cost price is lower and their weight is inferior. In particular, polyester parts obtained by injection, compression or lamination are used. Such polyester parts are not completely homogeneous so that their surfaces to be painted are porous.
Si l'on applique directement de la peinture avec une couche d'apprêt ou non sur les surfaces en question, de l'air et des produits liquides (eau, solvant) sont emprisonnés dans les porosités. Au moment de la cuisson des peintures entre 70 ° C et 200 ° C ces éléments se volatilisent pour engendrer des défauts d'aspect constitués de petites bulles, de cratères, etc... On comprend aisément que ces défauts d'aspect sont inacceptables en particulier pour des pièces de véhicules automobiles ou autres éléments devant présenter une finition irréprochable.If paint is applied directly with a coat of primer or not on the surfaces in question, air and liquid products (water, solvent) are trapped in the porosities. When the paints are fired between 70 ° C and 200 ° C, these elements volatilize to generate appearance defects consisting of small bubbles, craters, etc. It is easy to understand that these appearance defects are unacceptable in particularly for motor vehicle parts or other elements which must have an impeccable finish.
Si l'on doit réparer les défauts d'aspect considérés, on perd tout le bénéfice de la réalisation des pièces à base de polyester puisqu'il faut alors effectuer des réparations par masticage, puis faire un ponçage et redéposer une couche de peinture.If we have to repair the appearance defects considered, we lose all the benefit of the production of polyester-based parts since it is then necessary to make repairs by puttying, then make a sanding and redeposit a layer of paint.
Les perfectionnements qui font l'objet de la présente invention visent à remédier à ces inconvénients et à permettre la réalisation d'un procédé de préparation de pièces en matériaux composites, éliminant de façon significative les défauts d'aspect lors de l'application soit d'apprêt, soit de peinture de finition par le procédé électro-statique.The improvements which are the subject of the present invention aim to remedy these drawbacks and allow the production of a process for the preparation of parts made of composite materials, significantly eliminating appearance defects during application either '' primer, or finishing paint by the electro-static process.
A cet effet le procédé suivant l'invention consiste :
- - à pulvériser un produit liquide à base de résines époxy en vue de réaliser une couche d'étanchéité ;
- - à appliquer directement sur le revêtement époxy sans séchage-cuisson, une couche de primaire conducteur pour l'application finale d'un apprêt et/ou d'une peinture ;
- - à placer la pièce apprêtée dans une enceinte de séchagecuisson ;
- - et à appliquer au moins une couche de finition provisoire ou définitive par procédé électrostatique ou non.
- - spraying a liquid product based on epoxy resins in order to produce a sealing layer;
- - to apply directly to the epoxy coating without drying-firing, a layer of conductive primer for the final application of a primer and / or a paint;
- - place the prepared part in a drying drying chamber;
- - And to apply at least one provisional or final top coat by electrostatic process or not.
Ce procédé utilise un produit de masticage à base de résine époxy se présentant sous la forme d'un liquide à deux composants.This process uses an epoxy resin sealant in the form of a two-component liquid.
La couche de produit constitue un écran sur les surfaces à peindre comble les porosités, cratères et autres défauts d'aspect. Une couche de primaire conducteur, destinée à faciliter l'application des couches de finition par procédé électro-statique, est associée au produit de masticage de manière a permettre t'accrochage des peintures d'apprêt et de finition projetées par procédé électro-statique.The product layer forms a screen on the surfaces to be painted to fill porosity, craters and other appearance defects. A layer of conductive primer, intended to facilitate the application of topcoats by electro-static process, is associated with the putty product so as to allow the attachment of priming and finishing paints projected by electro-static process.
Le produit de masticage à base de résines époxy peut être celui vendu dans le commerce sous la dénomination "EUROXY" et distribué par la Société B.A.S.F.The putty product based on epoxy resins can be that sold commercially under the name "EUROXY" and distributed by the company B.A.S.F.
Ce produit est un produit liquide bi-composant.This product is a two-component liquid product.
Le produit primaire conducteur peut-être celui vendu sous la référence "3035113" par la Société AKZO.The primary conductive product may be that sold under the reference "3035113" by the company AKZO.
Ces produits sont particulièrement intéressants du fait qu'ils sont chimiquement compatibles si bien qu'ils assurent ainsi une bonne adhérence entre couches.These products are particularly advantageous because they are chemically compatible so that they thus ensure good adhesion between layers.
Le procédé ci-dessus peut être mis en oeuvre directement sur des pièces brutes à condition que celles-ci soient exemotes de toute graisse.The above process can be carried out directly on the raw parts provided that these are free of any grease.
Dans le cas contraire il faut commencer par pratiquer un dégraissage des pièces brutes par exemple avec une solution alcaline ou au moyen de solvants liquides ou encore par des jets de vapeur, puis à rincer les pièces à l'eau de ville, à effectuer ensuite un autre rinçage à l'eau déminéralisée, puis à sécher les pièces en étuve entre 100 et 160°. A la sortie de l'étuve il est nécessaire de refroidir les pièces entre 20 et 90 °.Otherwise, it is necessary to start by degreasing the raw parts, for example with an alkaline solution or by means of liquid solvents or with steam jets, then rinse the parts with tap water, then carry out a another rinse with demineralized water, then dry the parts in an oven between 100 and 160 °. At the exit of the oven it is necessary to cool the pieces between 20 and 90 °.
Dans le procédé décrit plus haut la couche de primaire conducteur est appliquée directement sur la couche à base de résine époxy sans aucun séchage de celui-ci c'est-à-dire suivant ce que l'on appelle dans la technique en "mouillé sur mouillé".In the process described above, the layer of conductive primer is applied directly to the layer based on epoxy resin without any drying thereof, that is to say according to what is known in the art as "wet on". wet".
Les pièces sont alors cuite en étuve entre 80 et 160°.The pieces are then baked in an oven between 80 and 160 °.
Bien entendu on pourrait inverser l'application de la couche de résine époxy et de la couche de produit primaire conducteur en déposant cette dernière en premier sur la pièce brute dégraissée ou non puis le produit à base de résine époxy avant séchage du primaire conducteur. Les pièces sont ensuite cuite en étuve entre 80 ° et 160 °.Of course, the application of the layer of epoxy resin and of the layer of primary conductive product could be reversed by depositing the latter first on the raw part which is degreased or not, then the product based on epoxy resin before drying of the primary conductive. The pieces are then baked in an oven between 80 ° and 160 °.
Dans un autre mode d'exécution, on applique sur les pièces brutes dégraissées ou non le produit à base de résine époxy, on fait durcir en étuve cette couche puis on applique la couche de primaire conducteur directement sur celle de résine époxy polymérisée en étuve entre 80 et 160 et l'on durcit en étuve cette nouvelle couche dans les mêmes conditions que précédemment.In another embodiment, the epoxy resin-based product is applied to the raw parts which have been degreased or not, this layer is hardened in an oven and then the layer of conductive primer is applied directly to that of epoxy resin polymerized in an oven between 80 and 160 and this new layer is hardened in an oven under the same conditions as above.
Dans une autre variante correspondant au dépôt en première phase de la couche de primaire conducteur on peut faire sécher en étuve celle-ci entre 80 et 160° avant la pulvérisation du produit à base résine époxy, la pièce apprêtée étant ensuite passée en étuve de cuisson toujours dans les mêmes conditions de température.In another variant corresponding to the deposition in the first phase of the primer layer conductive it can be dried in an oven between 80 and 160 ° before spraying the product based on epoxy resin, the primed part then being passed into a baking oven always under the same temperature conditions.
Ces opérations de séchage-cuisson peuvent s'effectuer en tunnel ou en étuve à des températures situées entre 80 et 160 pendant 20 à 30 minutes.These drying-cooking operations can be carried out in a tunnel or in an oven at temperatures between 80 and 160 for 20 to 30 minutes.
Une autre solution consiste à appliquer directement, sur la pièce brute dégraissée ou non, une couche d'apprêt conducteur à base de la résine époxy précédemment citée. La pièce ainsi apprêtée est séchée et cuite dans un tunnel ou une étuve à des températures entre 80 et 160° pendant 20 ou 30 minutes.Another solution consists in applying directly, on the degreased or not degreased blank, a layer of conductive primer based on the aforementioned epoxy resin. The prepared piece is dried and baked in a tunnel or an oven at temperatures between 80 and 160 ° for 20 or 30 minutes.
Claims (8)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9210662A FR2695048B1 (en) | 1992-09-02 | 1992-09-02 | Process for the preparation of molded parts surfaces to be covered with electrostatic paint. |
EP93420434A EP0668112A1 (en) | 1992-09-02 | 1993-10-29 | Process for prepararing molded objects surfaces to be electrostatically painted |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9210662A FR2695048B1 (en) | 1992-09-02 | 1992-09-02 | Process for the preparation of molded parts surfaces to be covered with electrostatic paint. |
EP93420434A EP0668112A1 (en) | 1992-09-02 | 1993-10-29 | Process for prepararing molded objects surfaces to be electrostatically painted |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0668112A1 true EP0668112A1 (en) | 1995-08-23 |
Family
ID=26134770
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93420434A Withdrawn EP0668112A1 (en) | 1992-09-02 | 1993-10-29 | Process for prepararing molded objects surfaces to be electrostatically painted |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0668112A1 (en) |
FR (1) | FR2695048B1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2695048B1 (en) * | 1992-09-02 | 1994-10-14 | Manducher Sa | Process for the preparation of molded parts surfaces to be covered with electrostatic paint. |
FR2713518B1 (en) * | 1993-12-14 | 1996-01-26 | Applic Peintures Ste Indle | Method for electrostatically coating an epoxy resin on plastic objects. |
IT1276480B1 (en) * | 1995-07-07 | 1997-10-31 | Fiat Auto Spa | IMPROVED PAINTING METHOD APPLICABLE ON ELEMENTS MADE OF PLASTIC MATERIAL, PARTICULARLY AUTOMOTIVE COMPONENTS |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
UST982004I4 (en) * | 1974-12-23 | 1979-05-01 | Powder coated resinous article | |
FR2695048A1 (en) * | 1992-09-02 | 1994-03-04 | Manducher Sa | Preparing articles moulded from polyester compsns. for finish coating - by applying a liq. epoxy primer compsn. to fill porosity and surface defects |
-
1992
- 1992-09-02 FR FR9210662A patent/FR2695048B1/en not_active Expired - Fee Related
-
1993
- 1993-10-29 EP EP93420434A patent/EP0668112A1/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
UST982004I4 (en) * | 1974-12-23 | 1979-05-01 | Powder coated resinous article | |
FR2695048A1 (en) * | 1992-09-02 | 1994-03-04 | Manducher Sa | Preparing articles moulded from polyester compsns. for finish coating - by applying a liq. epoxy primer compsn. to fill porosity and surface defects |
Also Published As
Publication number | Publication date |
---|---|
FR2695048B1 (en) | 1994-10-14 |
FR2695048A1 (en) | 1994-03-04 |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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Owner name: PEGUFORM FRANCE |
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Effective date: 19970314 |
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18D | Application deemed to be withdrawn |
Effective date: 19970925 |