Guideline of trade associations - VdL Verband der Lackindustrie e.V.

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10 Properties of coatings such as thermoplasticity, hardness, mechanical resistance, UV resistance, resistance to heat and chemicals etc. are essentially influenced by the binder. Characterization of coating materials and coatings by statement of the binder basis is therefore meaningful, both in practice and standardization, and is also common practice. Decisive for the suitability in duplex systems is, however, the special formulation with optimum adaptation of suitable binders from a large number of possibilities within the binder classes and the pigment composition. Depending on the application case, priming, intermediate and top coats will be used, or top coats also directly. Paint coatings on zinc coatings not normally require pigmentation with active pigments. The use of such pigments is, however, possible and may be advantageous in special cases. The coating materials for a coating system and their application are to be adapted to each other. The materials should, if possible, originate from one and the same manufacturer. For duplex systems only such coating materials must be used for which a confirmation of the manufacturer on their suitability on a hot-dip galvanized zinc coating is available. Coating materials with optimum formulation give coatings with good adhesion. The requirements to the surface preparation/surface treatment depend on the coating material. Liquid and powder coating materials are listed in tables 2 and 3. Epoxy resin coatings with high mechanical resistance and good resistance to chemicals are preferably used inside buildings because of their typical chalking under UV exposure, under natural weathering conditions normally together with UV-resistant top coats. The colour stability and the remaining properties will be influenced by the binder basis, but exceptionally by the formulation of the products Advice can be taken from the technical papers issued by the manufacturers.
11 Table 2: Binder basis and film formation of the mainly used liquid coating materials for duplex systems Liquid coating materials Binder basis Volatile matter Symbol 1-pack (1K) coating materials Acrylic resins Acrylic resins Vinyl chloride copolymers 2-pack (2K) coating materials Epoxy resins EP + Polyamino compounds Epoxy resin combinations EP/hydrocarbon resins + polyamino compounds Polyurethane resins Acrylic resins + aliphatic poly- isocyanate AY AY PVC EP EP/ comb PUR organic solvents 1) water 2) organic solvents 1) organic solvents 1) organic solvents 1) organic solvents 1) Type of film formation physically drying physically drying (by coalescence) physically drying Curing by chemical reaction Curing by chemical reaction/physi cally drying Curing by chemical reaction 1) Different composition , adapted to binder, application and drying conditions 2) Low amounts of organic solvents technically required
Page 1 and 2: Guideline of Trade Associations Cor
Page 3 and 4: 3 Contents Page 1 Field of applicat
Page 5 and 6: EN ISO 2360 Non-conductive coatings
Page 7 and 8: 5 Composition and properties of dup
Page 9: To retard the possible formation of
Page 13 and 14: 13 5.3.3 Special notes for powder c
Page 15 and 16: 15 Surface preparation: � Washing
Page 17 and 18: 17 � Ammonia solution wash with w
Page 19 and 20: 19 Hot-dip galvanizing Priming coat
Page 21 and 22: 21 10 Use of duplex systems in stee
Page 23 and 24: 23 They are to be prepared in repre

Guideline of trade associations - VdL Verband der Lackindustrie e.V.

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