Additives for waterborne coatings

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1 Additives for waterborne coatings Wernfried Heilen 1 Introduction 2 Wetting- and dispersing additives 2.1 Modes of action Pigment wetting Grinding Stabilisation Electrostatic stabilisation Steric stabilisation Electrosteric stabilisation Influences on formulation Viscosity Colour strength Compatibility Stability 2.2 Chemical structures Polyacrylate salts Fatty acid and fatty alcohol derivatives Acrylic-copolymers Maleic anhydride copolymers Alkyl phenol ethoxylates Alkyl phenol ethoxylate replacements 2.3 Wetting and dispersing additives in different market segments Architectural coatings Direct-grind Pigment concentrates Wood and furniture coatings Direct grind Pigment concentrates Industrial coatings Direct grind Pigment concentrates Printing inks Direct grind Pigment concentrates 2.4 Tips and Tricks 2.5 Test methods Particle size Colour strength Rub-out Viscosity Zeta potential 2.6 Summary 2.7 Literature 3 Defoaming of coating systems 3.1 Defoaming mechanisms Foam Causes of foam Types of foam 3.2 Defoamers

2 3.2.1 Composition of defoamers Defoaming mechanisms Defoaming by drainage/slow defoaming Entry barrier/entry coefficient Bridging mechanism Spreading mechanism Bridging stretching mechanism Bridging dewetting mechanism Spreading fluid mechanism Spreading wave mechanism Effect of fillers on the performance of defoamers 3.3 Chemistry and formulation of defoamers Active ingredients in defoamers Silicone oils (polysiloxanes) Mineral oils Vegetable oils Polar oils Molecular defoamerss (gemini surfactants) Hydrophobic particles Emulsifiers Solvents Defoamer formulations Suppliers of defoamers 3.4 Product recommendations for different binders Acrylic emulsions Styrene acrylic emulsions Vinyl acetate based emulsions Polyurethane dispersions 3.5 Product choice according to field of application Influence of the pigment volume concentration (PVC) Method of incorporating the defoamer Application of shear forces during application Surfactant content of the formulation 3.6 Tips and tricks 3.7 Summary 3.8 Literature 4 Rheology modifiers 4.1 General assessment of rheology modifiers Market overview Basic characteristics of the different rheological additives 4.2 Requirements for rheology modifiers Rheology Example of application 4.3 Ethoxylated and hydrophobically modified urethanes Synthesis of HEUR Associative properties of HEUR additives From self association to associative behaviour Hydrophobic/hydrophilic equilibrium of waterborne coatings Improved colour acceptance with HEUR 4.4 Alkali swellable emulsions: ASE and HASE Synthesis ASE HASE Interaction between binders Thixotropy and HASE 4.5 Outlook

3 4.6 Literature 5 Substrate wetting additives 5.1 Mechanism of action Water as a solvent Surface tension Reason of the surface tension Effect of the high surface tension of water Substrate wetting additives are surfactants Mode of action of substrate wetting additives Further general properties of substrate wetting additives/side effects 5.2 Chemical structure of substrate wetting additives Basic properties of substrate wetting additives Chemical structure of substrate wetting additives important in coatings Polyethersiloxanes Gemini surfactants Fluoro surfactants Acetylenediols and modifications Sulfosuccinate Alkoxylated fatty alcohols Alkylphenol ethoxylates (APEO) 5.3 Application of substrate wetting additives Basic properties of various chemical classes Reduction of static surface tension Possible foam stabilisation Effective reduction in static surface tension versus flow Reduction of dynamic surface tension Which property correlates with which practical application? Craters Wetting and atomisation of spray coatings Rewettability, reprintability, recoatability Flow Spray mist uptake 5.4 Use of substrate wetting additives in different market sectors 5.5 Tips und tricks Successful use of substrate wetting additives in coatings Metallic shades 5.6 Test methods for measuring surface tension Static surface tension Dynamic surface tension Dynamic versus static Further practical test methods Wedge spray application One spray path Crater test Draw down Spray drop uptake Analytical test methods 5.7 Literature 6 Improving performance with co-binders 6.1 Preparation of co-binders Secondary dispersions Polyester dispersions Polyurethane dispersions 6.2 Applications of co-binders Co-binders for better property profiles

4 Drying time Adhesion Hardness-flexibility balance Gloss Co-binders for pigment pastes 6.3 Summary 6.4 Literature 7 Deaerators 7.1 Mode of action of deaerators Dissolution of microfoam Rise of microfoam bubbles in the coating film How to prevent microfoam in coating films How deaerators combat microfoam Deaerators promote the dissolution or formation of small microfoam bubbles How deaerators promote the dissolution of microfoam bubbles 7.2 Chemical composition of deaerators 7.3 Main applications according to binder systems 7.4 Main applications according to market segments 7.5 Tips and tricks 7.6 Evaluating the effectiveness of deaerators Test method for low to medium viscosity coating formulations Test method for medium to high viscosity coating formulations Further test methods for microfoam 7.7 Conclusion 7.7 Literature 8 Flow additives 8.1 Mode of action Mode of action in waterborne systems without co-solvents Sagging Total film flow Mode of action in waterborne systems with co-solvents Mode of action in an example of a thermosetting waterborne system with cosolvents Surface tension gradients Summary 8.2 Chemistry of active ingredients Polyether siloxanes Polyacrylates Side effects of polyether siloxanes Slip 8.3 Film formation 8.4 Main applications by market segment Industrial metal coating Electrophoretic coating Waterborne coatings Industrial coatings Architectural coatings Flat and semi-gloss emulsion paints High gloss emulsion paints 8.5 Conclusion 8.6 Test methods Measurement of flow Measuring flow and sagging by DMA Measuring the surface slip properties 8.7 Literature

5 9 Wax additives 9.1 Raw material wax Natural waxes Waxes from renewable raw materials Waxes from fossilised sources Semi-synthetic and synthetic waxes Semi-synthetic waxes Synthetic waxes 9.2 From wax to wax additives Wax and water Wax emulsions Wax dispersions Micronized wax additives 9.3 Wax additives for the coating industry Acting mechanism Coating properties Surface protection Gloss reduction Texture and structure Rheology control 9.4 Summary 10 Light stabilizers for waterborne coatings 10.1 Introduction 10.2 Light and photo-oxidative degradation 10.3 Stabilization options for polymers UV absorbers Radical scavengers Antioxidants Sterically hindered amines 10.4 Light stabilizers for waterborne coatings Market overview Application fields and market segments Application specific product selection 10.5 Conclusions 10.6 Test methods and analytical determination UV absorbers HALS Weathering methods and evaluation criteria Accelerated exposure tests Further evaluation criteria 10.7 Literature 11 In-can and dry film preservation 11.1 Sustainable and effective in-can and dry film preservation 11.2 In-can preservation Types of active ingredients Selection of active ingredients for the preservation system Plant hygiene 11.3 Dry film preservation Conventional dry film preservatives New, old actives Improvements in the ecotoxicological properties 11.4 External determining factors 11.5 Prospect 11.6 Literature

6 12 Hydrophobing agents 12.1 Mode of action Capillary water-absorption Hydrophobicity How hydrophobing agents work 12.2 Chemical structures Linear polysiloxanes and organofunctional polysiloxanes Silicone resins/silicone resin emulsions Other hydrophobing agents Production of linear polysiloxanes Production of silicone resin emulsions Secondary emulsification process Primary emulsification process 12.3 Waterborne architectural paints Synthetic emulsion paints Silicate emulsion paints Emulsion paints with silicate character (SIL-paints) Siloxane architectural paints with strong water-beading effect Silicone resin emulsion paints 12.4 Conclusions 12.5 Appendix Facade protection theory according to Künzel Measurement of capillary water-absorption (w-value) Water vapour diffusion (s d -value) Simulated dirt pick-up Pigment-volume concentration (PVC): 12.6 Literature Authors Index

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