Process for the production of a multicoat refinish

Details Process for the production of a multicoat refinish Process for the production of a multicoat refinish

1996-03-06

1997-11-04

Dudash, Diana

Coating processes

Restoring or repairing

427142, 427421, 4274071, B05D 102, B05D 136, B05D 716

Patent

active

056837453

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a process for the production of a multicoat refinish, in which cleaning, sanding and, if desired, application of a knifing filler and/or filler material, and the adjacent areas, bearing the old finish, are prepared for the application of a refinish, by an appropriate pretreatment, special-effect pigments is applied by spraying to the prepared damage site and to the adjacent areas bearing the old finish, with a coat thickness such that the basecoat is opaque in the region of the damage site and gradually runs out in the adjacent region of the old finish, (2), resulting basecoat and, if desired, to the adjacent area not coated with a basecoat but bearing the old finish, and subsequently ambient temperature and 140.degree. C., preferably at temperatures below 100.degree. C., particularly preferably at temperatures below 80.degree. C.
The repair of damage sites in a finish is commonly carried out by thorough cleaning of the damage site, sanding, optional knife-filling and application of a repair filler to the damage site. The damage site is then coated. Frequently, however, color differences are to be expected in a panel repair of this type. The repair of metallic finishes is a particular problem, since the color and the brightness of the effect depend heavily on the manner of processing. Decisive factors in this context include the nozzle width of the spraygun and the spray pressure. The nature of dilution and the spray viscosity also have an influence on color and effect.
If color differences are to be expected in such a panel repair and there is no delimitation of the area by trim strips or edges, it may be advantageous and economic to compensate the color differences by so-called blending into the adjacent section, the spray coat gradually running out.
In the case of blending in, the respray coat is opaque in the damage site and gradually runs out in the adjacent areas, i.e. the coating thickness gradually decreasing to 0 .mu.m from the edge of the damage site outwards, using special-effect finishes such as metallic basecoats. After this, the whole area is then covered with a clearcoat until delimitations are reached. In this context, the damage site is usually recoated opaquely at a reduced spraygun pressure of about 2 bar and the blend-coating area is coated over thinly, gradually running out, at a reduced pistol pressure of about 1 bar ("misting out"). Low-solids, conventional special-effect finishes are normally employed for this repair to the damage site. After initial drying of the basecoat produced in this way, the repair site and the adjacent sections are resprayed totally with a clearcoat and, after any flash-off time which may be necessary, are dried together with the previously applied layers at temperatures of, preferably, between ambient temperature and 100.degree. C.
Furthermore, it is common in such a panel repair, if color differences are to be expected and there is no delimitation of the area by trim strips or edges, to follow the conventional preparatory work by prespraying with a heavily diluted clearcoat. The damage site is then resprayed opaquely at reduced spraygun pressure (about 2 bar) with the basecoat composition, and then the blend-coating area is recoated thinly, gradually running out, at about 1 bar spraygun pressure ("misting out"). This process is also followed, after initial drying of the basecoat produced in this way, by a total respray of the repair site and the adjacent sections with a clearcoat and, after any flash-off time which may be necessary, by drying together with the previously applied coats at temperatures of, preferably, between ambient temperatures and 100.degree. C.
In the abovementioned processes which are usual for the production of a refinish, the spraygun is normally held at right angles to the substrate surface for the application of the individual coats of paint. For misting out, the gun is often rotated out of this right-angled position to the mist region, in order to achieve a finer transition. In the course of the ble

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