| 00:00:00 | The importance of particle size, shape, and rheology in the paints, coatings, and pigments industries |
| 00:01:32 | The importance of particle size, shape, and rheology in the paints, coatings, and pigments industries |
| 00:02:27 | Abstract |
| 00:03:10 | Outline |
| 00:04:00 | Opening quotation |
| 00:04:51 | Trends in the industry |
| 00:06:36 | General slide G G Sward & A E Jacobsen Chapter 3.4 “Particle Size Measurement” in Editor G G Sward “Paint Testing Manual: Physical and Chemical Examination of Paints, Varnishes” 13th Edition ASTM (1972) |
| 00:08:03 | Particle Size – early web reference! |
| 00:08:53 | Particle Size – early web reference! |
| 00:09:40 | Particle Size – early web reference! |
| 00:10:08 | Titanium dioxide |
| 00:11:41 | Titanium dioxide |
| 00:13:10 | Scattering Efficiency vs Refractive Index |
| 00:14:03 | Weber |
| 00:14:28 | Weber – extract formula |
| 00:15:00 | Optimum size (Weber) Calculations for RI and l |
| 00:16:20 | Hans H Weber and Gustav Mie |
| 00:16:32 | Scattering Coefficient – 1960 “TiO2 in linseed oil” (but the latter has an RI of ~ 1.48!) 2.73/1.795 ~ 1.52 Loney used 2.71/1.51 (page 14 of reference) |
| 00:17:52 | Ferranti Pegasus |
| 00:18:43 | Pegasus 2 |
| 00:19:12 | Philip Laven’s MiePlot – Freeware… http://www.philiplaven.com/mieplot.htm |
| 00:19:44 | Philip Laven’s MiePlot (using v 4.001) Up to 200mm |
| 00:20:10 | Compare with Loney (1960) Needs adjustment of scales |
| 00:20:33 | Fraunhofer approximation Scattering/Extinction Coefficient (K) |
| 00:21:13 | What does the scattering coefficient mean in practice? |
| 00:22:08 | Titanium dioxide Hiding power - due to scattering |
| 00:22:34 | Transparent TiO2? |
| 00:23:23 | Transparent TiO2? |
| 00:23:42 | Imaginary component - what’s probably correct? Depends on the type and coating For this material, then pitching around 0.1 – multiple scattering |
| 00:24:15 | 0 and 1 imaginary Smoother plot and reduces the maximum |
| 00:25:06 | TiO2 regarded as unsuited for size measurement… Henry Green “A photomicrographic method for the determination of particle size of paint and rubber pigments” J. Franklin Institute 637-66 (November 1921) |
| 00:26:01 | Particle Shape |
| 00:26:50 | Early literature reference |
| 00:27:30 | Rose (pages 18 and 19) |
| 00:28:20 | TiO2 |
| 00:29:24 | Metal flakes/bronzes |
| 00:30:43 | Don’t think that this alignment is easy… |
| 00:31:40 | Aluminum flake Breda and Lutz catalog |
| 00:32:07 | http://www.emd-performance-materials.com/en/plastics/know_how/know_how.html |
| 00:32:38 | KemFx KonFusion KF-04 Chameleon paint http://www.youtube.com/watch?v=tEq5p_feo7E |
| 00:33:24 | Zeta Potential |
| 00:35:10 | Reference |
| 00:37:04 | TiO2- High concentration measurements |
| 00:38:19 | Lambourne page 262 |
| 00:39:46 | Indications that there is a stability issue |
| 00:40:25 | Stability studies with Zeta3000HS plus titrator |
| 00:42:09 | Stability studies with Zeta3000HS plus titrator |
| 00:42:55 | Measurement with optimum conditions |
| 00:43:15 | Measurement with optimum conditions |
| 00:43:45 | Rheology |
| 00:44:52 | Untitled |
| 00:45:42 | Patton - 1968 |
| 00:46:21 | Richard R Eley |
| 00:47:06 | Coating |
| 00:48:22 | Transfer from container to applicator |
| 00:49:30 | Film formation |
| 00:49:59 | Flow-out of paint film |
| 00:51:25 | Flow-out of paint film |
| 00:52:15 | Shear rates of different processes |
| 00:53:07 | Links between the properties |
| 00:54:39 | Application examples Yield point from stress ramp |
| 00:55:10 | Application examples Yield stress and yield point from strain sweep |
| 00:55:56 | References |
| 00:56:28 | Contact Information |
This presentation will highlight the importance of 4 fundamental characterization parameters (size, shape, rheology, zeta potential) to the formulation and specification of coatings, paints, and pigments.