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
  • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
  • B05D7/50—Multilayers
  • B05D7/52—Two layers
  • B05D7/54—No clear coat specified
  • B05D7/542—No clear coat specified the two layers being cured or baked together
• • 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
  • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
  • B05D7/02—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber
• • 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
  • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
  • B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects

Definitions

• This invention relates to a method for lacquering a surface, a first layer of a product containing a coloured pigment and a second layer of a product containing a coloured pigment being successively applied to a surface, one covering the other, on the one hand, and to a section made of synthetic material made according to such a method, on the other hand.
• the field of application of the invention is more particularly the surfaces of doors, windows or porches.
• the underlying material may be both thermosetting and thermoplastic synthetic material.
• thermosetting and thermoplastic synthetic material for manufacturing the section made of synthetic material, in most cases use is made of polyvinyl chloride (PVC).
• Sections made of a polymer matrix, such as PVC, for instance, are used more and more. They are used, for instance, for manufacturing window sections, doors, etc...
• the great advantage of such sections is their low weight and their resistance to corrosion.
• reinforcing fibres are added to the polymer matrix, however they do have the disadvantage that the resistance to shock of the sections equipped with such reinforcing elements is strongly reduced, moreover these fibres are very expensive.
• the RAL-standard is an internationally agreed standard that is used to indicate identical colours, RAL 6009, for instance, stands for pine foliage and RAL 5012 for steel blue.
• the purpose of the present invention is to provide a method for lacquering surfaces of synthetic material according to which less infrared radiation is absorbed by the polymer matrix, so that less deformation will occur and there will no longer be any difference in colour with respect to the RAL-standard.
• the purpose of the invention is attained by providing a method for lacquering a surface, a first layer of a product containing a coloured pigment and a second layer of a product containing a coloured pigment being successively applied to the surface, one covering the other, the second layer containing no carbon black and the first and the second layer together producing a predetermined colour. Because of this a surface with a predetermined colour is obtained, absorbing far less infrared radiation.
• the predetermined colour is a RAL-colour, because of which surfaces may be produced having the exact colour according to the RAL-standard.
• the great advantage of this method is that the method described in the present invention is universally applicable.
• the colour of the first and the second layer both belong to the same RAL-group of colours.
• the second layer is applied before the first layer will be dry.
• the first layer and/or the second layer are dispersed with polyamide particles, because of which a granular aspect is obtained.
• the said surface is a section made of synthetic material, preferably made of polyvinyl chloride.
• Another object of the present invention is a section made of synthetic material, provided with at least two layers of coating with a coloured pigment, the upper layer containing no carbon black and in combination with the underlying layer producing a predetermined colour, this predetermined colour belonging to the RAL-standard.
• the colours of the two layers belong to the same RAL-colour group.
• the underlying layer is a dark coating that under influence of the sun causes a rise in temperature of the surface with respect to the ambient temperature of minimum 65°C.
• the underlying layer is a semidark coating, that under the influence of the sun produces a rise in temperature of the surface ranging from 30°C to 50°C with respect to the ambient temperature.
• sections made of synthetic material of the colour RAL 5007 (light blue) or, for instance, RAL 1013 (pearl white) may be produced, having far less chance to reach their Vicat temperature.
• said sections are provided for manufacturing doors, windows and porches.
• the section made of synthetic material has to be provided with a covering layer containing a coloured pigment (including carbon black) of liquid paint on a basis of thermoplastic resins, which paint contains a thermosetting polymer with hydroxyl and/or carboxyl groups, a hardener for interlacing the polymer and possibly containing a thermoplastic polyamide resin powder dispersed in the paint.
• a coloured pigment including carbon black
• the product ensuring interlacing also known as hardener, consists of aliphatic isocyanates. As an alternative it might also be aliphatic or cycloaliphatic, the use of diisocyanates and tri-isocyanates being preferred. In this case the combined polymer has a hydroxide and/or carboxyl/isocyanate function known as polyurethane.
• polyamides examples include polyamide PA-6.6., polyamide-6.10. and polyamide PA-6.12. Mixtures are possible. usually they are PA-11, PA-12, PA-6/12 and/or PA-12.12., separated or as mixtures, in short, preferably polyamides having 10 to 13 carbon atoms per carbon amide group.
• the powders are obtained by grinding or direct polymerization in order to obtain the desirable granulometric dimensions.
• the final aspect of the first layer may be either a smooth structure or a granulated structure and any structure in between.
• the first layer is applied by means of a spray unit, the sections made of synthetic material being introduced into an automated spray unit, with an automatic conveying system.
• the visual aspect of the coloured surfaces is more uniform than when using a manual treatment.
• Applying the first layer may be carried out in a number of successive steps, for instance, a first layer containing pigment (including carbon black) may be applied in two phases.
• the second layer containing coloured pigment (the cold pigment layer) that contains no carbon black is applied wet-on-wet, i.e. without the first layer being dried.
• the grains of polyamide are dispersed in the top layer.
• both layers have been applied to the section made of synthetic material, they have to undergo a post hardening.
• This process sometimes is described as "curing".
• this post hardening occurs within half an hour after the spraying operation and at a temperature of 80°C maximum. This is done, because it has been found that by not waiting too long after applying the coloured layers, the best results are obtained from an aesthetic point of view.
• the temperature for this post hardening is preferably chosen between 40°C and 80°C.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Wood Science & Technology (AREA)
• Paints Or Removers (AREA)
• Laminated Bodies (AREA)
• Application Of Or Painting With Fluid Materials (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=32660552

Family Applications (1)

Country Status (2)

Citations (6)

• 2003
  • 2003-02-12 BE BE2003/0096A patent/BE1015357A5/nl not_active IP Right Cessation
• 2004
  • 2004-02-10 EP EP04075418A patent/EP1447146A1/de not_active Withdrawn

Patent Citations (6)

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