Citation
(2010), "Understanding and testing the wet and dry properties of coatings", Pigment & Resin Technology, Vol. 39 No. 4. https://doi.org/10.1108/prt.2010.12939dac.002
Publisher
:Emerald Group Publishing Limited
Copyright © 2010, Emerald Group Publishing Limited
Understanding and testing the wet and dry properties of coatings
Article Type: Training From: Pigment & Resin Technology, Volume 39, Issue 4
Contents
Introduction to test methodology:
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principles of testing and correlation;
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quality control and specification;
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accuracy and precision;
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repeatability and reproducibility.
Properties of liquid coatings.
Rheology:
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definitions and units;
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types of rheological behaviour: shear thinning, thixotropy, extensional flow, etc.;
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factors influencing viscosity;
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measurement techniques; and
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overview of instruments: practical work.
Surface tension and flow
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wetting and contact angles;
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surface and interfacial tension;
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dynamic surface tension;
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surface tension gradients;
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control of spreading and flow;
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film defects: Bénard cells, craters, floating, flooding, orange peel, etc.;
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measurement of surface tension:characterisation tests; and practical work.
Properties of dry films:
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mechanical properties: modulus of elasticity; tensile strength; extensibility; impact strength and abrasion resistance; scratch resistance; and
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adhesion and adhesive performance: destructive and non-destructive test methods;
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resistance testing: durability and accelerated weathering; corrosion resistance testing;
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water permeability;
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appearance tests: gloss and sheen;
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opacity: contrast rations, scatter coefficients and tint methods.
Standards:
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purpose of standards;
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sources of standards: national standards, e.g. BSI; European standards EN; and international standards ISO;
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standard tests available at PRA.