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
  • B05D7/53—Base coat plus clear coat type

Definitions

• the present invention relates to a multi-layer coating with a soft-feel effect and their use.
• soft feeling paints are understood to mean those paints that are characterized by a special feel (grip).
• the softfeel effect is based essential on a combination of braking and sliding action. This gives one touches an object coated with a softfeel varnish Impression of touching a leather or velvet-like object, regardless of the actual feel of the substrate.
• Soft feeling paints are used especially for painting plastics and for Automotive interior painting used.
• EP-0 669 352 B1 describes soft-feeling lacquers based on polyester / polyurethane. All Examples reveal a soft feeling lacquer that also contains the pigment. Application of this soft feeling varnish to a pigmented coating is not called.
• a particular problem with the soft feeling lacquers known to date is their adhesiveness on different substrates. Due to the rubber-elastic properties of a Soft feeling lacquers show such coatings on critical substrates (e.g. Plastic surfaces) poorer adhesion than comparable paints without a soft feeling effect. Adhesion promoters therefore very often have to be used in the field of plastic painting in order to achieve acceptable liability in this way.
• critical substrates e.g. Plastic surfaces
• the object of the present invention is to provide a pigmented coating with soft-feel effect and their use, with particular liability and the soft-feel effect compared to the known soft-feeling paints of the prior art Technology are improved.
• This object is achieved, according to the invention, by a multi-layer coating from a coloring first layer on the substrate and one another unpigmented second layer located above the first layer, the second layer entirely or partially of an unpigmented soft-feeling lacquer is available.
• the first, coloring layer can in principle be any layer, by a crosslinking or curing process of a pigmented coating composition based on organic solvents, water or powder is available.
• Varnishes which are known as so-called Basecoats "can be used for the multi-layer coating of car bodies.
• This multilayer coating of automobiles generally consists of a total of four different layers (electrocoat layer, filler layer, basecoat layer and clearcoat layer). It is the task of the basecoat layer to give the body the desired color and to provide a precisely defined adhesion to the filler layer. The latter property is particularly important for the stone chip resistance of a car paint.
• a preferred embodiment of the invention is the use of a pigmented water-based lacquer to form the first, color-imparting layer.
• a pigmented water-based lacquer to form the first, color-imparting layer.
• this embodiment makes it possible to significantly reduce solvent emissions, particularly when painting on plastic substrates.
• it is advantageous to briefly dry it (eg for 5 minutes at 60 ° C) before applying the unpigmented soft-feeling lacquer.
• the dry film thickness has the properties of the multi-layer coating according to the invention no decisive influence, it usually lies in one Range between 12 to 40 ⁇ m.
• any lacquer can be used which contains at least one binder which, due to its special chemical and physical properties, gives this layer the rubber-elastic properties necessary for the soft-feeling effect.
• binder are known per se and are already used for the production of pigmented soft feeling lacquers.
• the amount of this binder is usually in a range between 25 and 65% by weight, based on the solids content.
• unpigrued is understood to mean paints or coatings that do not contain any coloring pigments. Under the term color pigments "are not understood as matting agents that usually contain layered silicates or waxes.
• binders that give the second layer the soft feeling properties confer, such binders are based on polyester / polyurethane. These binders are described in detail in European Patent 0 669 352 and are described by the Bayer AG sold under the trade name Bayhydrol®.
• the soft-feel multi-layer coating according to the invention shows a significantly improved Haptics compared to the pigmented soft feeling lacquers of the prior art.
• Multi-layer painting is the separation of binders, which is for the actual Soft feeling effect are responsible, and the coloring pigment (s).
• the dry layer thickness of the second layer is usually in a range between 15 to 60 ⁇ m. In general, the thicker the dry layer thickness, the clearer the soft feeling effect becomes.
• Another embodiment of the invention is the use of a matting agent in the second, unpigmented layer. This causes an increase in the braking effect of the finished paint layer. This way it is possible to get the exact one Adjust braking and sliding effect of the multi-layer coating according to the invention.
• the multilayer coating according to the invention is particularly preferably suitable for the Painting of plastic surfaces, especially of parts of the automotive interior trim. It is particularly advantageous for the latter area that parts of the interior panels with the same paint and the same devices can be coated, such as plastic attachments (e.g. bumpers).
• plastic attachments e.g. bumpers
• the mixture obtained in this way is ground in a bead mill to a granularity of 5 ⁇ m. Then 100 g of a commercially available thickener (Viscalex® HV 30 Paste 3%) and 60.0 g of fully demineralized water are added to the mixture. Then 40 g of a commercially available polyurethane dispersion (Bayhydrol® 2952 E) are added with stirring.
• the basecoat produced in this way is adjusted to a pH of 8 using Amietol® M21 and the viscosity is adjusted to 35 seconds at 20 ° C., measured with a DIN B4 beaker, by adding demineralized water.
• the basecoat described above is applied to a plastic plate using a spray gun made of Bayblend® T 85 (polycarbonate / ABS) with the dimensions 210 * 150 * 3 mm applied so that a dry layer thickness of 15 microns is obtained. Then this one Coat the layer for 2 minutes at room temperature and then 4 minutes dried long at 80 ° C. Then the soft feeling clear coat described above applied by means of a spray gun, so that a dry layer thickness of 55 microns is obtained. After a flash-off time of 5 minutes at room temperature, the coated plate dried at 80 ° C for 30 minutes.
• Bayblend® T 85 polycarbonate / ABS
• This mixture is then adjusted to the required millbase viscosity with 1.2 g of n-methylpyrrolidone and 2.4 g of fully demineralized water and ground to a particle size of 10 ⁇ m by means of a bead mill. Then 104 g of a commercially available polyester / polyurethane dispersion (Bayhydrol® PR 340) are added with stirring and the mixture thus obtained after adding 21.4 g of Pergopak® M4 and 6.8 g of a commercially available matting agent (OK 500 from Fa. Degussa) dispersed for 20 minutes. 14.0 g of butylglycol and 14.0 g of fully demineralized water are then added to this mixture with stirring.
• This lacquer composition is then adjusted to a viscosity of 45 seconds at 20.degree. C. with 5.2 g of deionized water using a DIN B4 beaker.
• a 75% solution of a commercially available polyisocyanate (Bayhydur® 3100) in solvent seam is easily used as the hardener for this mixture.
• the pigmented soft feeling varnish described above is applied using a spray gun a plastic sheet made of Bayblen® T 85 (polycarbonate / ABS) with the dimensions 210 * 150 * 3 mm applied so that a dry layer thickness of 60 microns becomes. After a flash-off time of 5 minutes at room temperature, the coating Dried at 80 ° C for 30 minutes.
• Bayblen® T 85 polycarbonate / ABS
• the finished coatings are examined in accordance with the tests given in Table 1 for adhesion, climatic resistance, abrasion resistance and care agent resistance.
• the abrasion resistance is examined with a crock meter with a linen cloth without load both dry and with ethanol.
• the resistance to care products is examined according to the Mercedes Benz specification DBL 7384, according to which various test solutions (plastic cleaner, tar remover, window cleaner, stain remover) are applied to a square felt (from the company Empa, St. Gallen, Switzerland) with an area of 2.25 cm 2 .
• the felt, so saturated, is moved back and forth on the test surface with a mass of 332 g using a device (test section: 30 to 50 mm). 170 double strokes are to be completed in 2 minutes.
• test solutions are then rinsed with deionized water.
• the remaining surface is assessed.
• Optics OK liability GT 0
• Optics OK liability GT 1-2 Crockmeter (dry linen cloth / no load ethanol) 100/10 100/8 Care product resistance DBL 7384 (MB specification)
• No abrasion visible on the board. No discoloration on the felt.
• Table 1 clearly shows that the multi-layer coating according to the invention with Softfeel effect significantly improved properties compared to the softfeel varnishes of the Has state of the art.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Wood Science & Technology (AREA)
• Paints Or Removers (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Professional, Industrial, Or Sporting Protective Garments (AREA)
• Cosmetics (AREA)
• Toys (AREA)
• Laminated Bodies (AREA)
• Prostheses (AREA)
• Materials For Medical Uses (AREA)

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Citations (2)

• 1999
  • 1999-03-31 DE DE19914807A patent/DE19914807C1/de not_active Withdrawn - After Issue
• 2000
  • 2000-02-15 AT AT00103045T patent/ATE372834T1/de not_active IP Right Cessation
  • 2000-02-15 EP EP00103045A patent/EP1040875B1/fr not_active Revoked
  • 2000-02-15 ES ES00103045T patent/ES2296577T3/es not_active Expired - Lifetime
  • 2000-02-15 DE DE50014640T patent/DE50014640D1/de not_active Expired - Fee Related

Patent Citations (2)

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