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Coating compositions containing molybdenum disulfide

Datetime:2016/7/11 20:33:21hit:10500

Coating compositions containing molybdenum disulfide. Coating compositions which do not contain metal powders and which contain, as coloring component, 0.001 to 30% by weight of at least one organic pigment and/or of a polymer-soluble dye and/or of a pearlescent pigment and 0.001 to 30% by weight of molybdenum disulfide, based on the coating produced therewith, are suitable, for example, for coloring surfaces, especially metal surfaces.

 

EXAMPLE 1
In a 500 ml glass bead mill, 15.5 g of molybdenum (IV) sulfide (ex Fluka AG) having a particle size smaller than 350 m and 0.5 g of 1,2-octanediol are stirred in 120 ml of water. To the suspension are added 400 g of glass balls having a diameter of 3.5-4.0 mm and the mixture is ground for 9 hours at a temperature of ca. 20 C. and at a stirring rate of 320 rpm. The speed of the metal propeller mixer (5.5 cm diameter) is 0.92 m/sec. The molybdenum disulfide suspension is separated from the glass balls and then washed with a small amount of water and filtered. The filter residue is washed with cold water and dried at 70-80 C. in a vacuum drier, affording 15.2 g of a grey molybdenum disulfide which, when pulverised, can be readily incorporated in automotive laquers which are then stoved. Scanning electron photomicrographs of the conditioned molybdenum disulfide show particles of marked flake-like to platelet appearance. A particle size determination made with a granulometer of type 715E 598, supplied by CILAS, Marcoussis/FR, shows that 85% of the particles have a size of 6 to 24 m and a median size of 9.6 m.


EXAMPLE 2
3 g of the molybdenum disulfide obtained according to Example 1 and 3 g of copper phthalocyanine pigment, C.I. Pigment Blue 15:3, are stirred into 20 g of a mixture of the following composition: 50 g of Solvesso 150® (mixture of aromatic hydrocarbons, ESSO), 15 g of butylacetate, 5 g of Exkin II® (ketoxime-based levelling agent), 25 g of methyl isobutyl ketone and 5 g of silicone oil (1% in Solvesso 150®). After complete dispersion has been attained, 48.3 g of Baycryl L 530® (acrylic resin; 51% in xylene/butanol 3:1) and 23.7 g of Maprenal TTX® (melamine resin; 55% in butanol) are added. The batch is briefly homogenised and the resultant coating composition is then sprayed on to a metal sheet and stoved for 30 minutes at 130 C. The finish so obtained has a lustrous blue metallic shade of excellent fastness properties. The lacquer is distinguished by very good flow properties and excellent dispersion of the pigments.