Investigation of the Performance of Fumed Silica as Flow Additive in Polyester Powder Coatings
Source abstract
Abstract
Fumed silica is one of the most commonly used flow additives in the powder coating industry. To investigate the influence of the properties of fumed silica on powder coatings, three different types of fumed silica, Aerosil R812, R972, and R8200, were selected and introduced to an ultra-high-gloss powder paint by the dry-blending method with preset mixing conditions and times. Their effect on the powder flowability, coating application related properties and film properties were carefully studied. The angle of repose (AOR) and bed expansion height data, which represent the semi-dynamic and dynamic flowability of powders respectively, show a strong flowability enhancement for the powders with additives, and R812 exhibits the best performance compared to 8200 and R972, mainly due to its high hydrophobicity and specific surface area. For the ultra-high-gloss powder paint, all the flow additives cause slight gloss reductions, surface roughness increase and a significant effect on the distinctness of image (DOI). The addition of R972 is beneficial to the transfer efficiency of powders compared with the other two, while the additives impose only a minor influence in the Faraday cage effect. The melting and curing dynamics, i.e., gel time, and inclined plate flow, are not affected by the flow additives.
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Research context
OpenAlex topics: Polymer Foaming and Composites · Fluid Dynamics and Heat Transfer · Heat and Mass Transfer in Porous Media
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
Particle Technology Research Center, Department of Chemical & Biochemical Engineering, The University of Western Ontario, London, ON N6A 5B9, Canada
Funding
Evonik Corporation (USA) and the Natural Sciences and Engineering Research Council of Canada (NSERC)
References (56)
Show source-provided references
1. Acrylic/polyester hybrid powder coating system having excellent weather durability10.1016/S0300-9440(98)00004-6 ↗
2. A powder coating progress review
3. Flosbach, C., Matten, S., and Donnermeyer, J. (2014). Process for the preparation of a powder coating composition. (074576), US Patent.
4. Clariant revolutionizes powder coating aesthetics and performance with new additives
5. Powder coatings additives
6. Influence of additives on interfacial phenomena during film formation of powder coatings10.1007/BF02730032 ↗
7. Adhesion and aggregation of fine particles10.1016/S0032-5910(01)00386-2 ↗
8. An invited review: Van der waals and other cohesive forces affecting power fluidization10.1016/0032-5910(89)80001-4 ↗
9. Flow properties of fine powders in powder coating10.1016/j.partic.2009.05.007 ↗
10. The relationship between attractive interparticle forces and bulk behaviour in dry and uncharged fine powders10.1080/17461390500402657 ↗
11. Investigation of the recyclability of powder coatings10.1016/j.powtec.2011.03.016 ↗
12. Types of gas fluidization10.1016/0032-5910(73)80037-3 ↗
13. Antonyuk, S. (2019). Improved Flowability of Ultrafine, Cohesive Glass Particles by Surface Modification Using Hydrophobic Silanes. Particles in Contact, Springer.10.1007/978-3-030-15899-6 ↗
14. Study on fluidization mechanism and agglomerating behavior of ultrafine powders
15. Fumed silica–rheological additive for adhesives, resins, and paints10.1002/1521-3900(200209)187:1<573::AID-MASY573>3.0.CO;2-1 ↗
16. Parametric study of fine particle fluidization under mechanical vibration10.1016/j.powtec.2005.10.002 ↗
17. The effect of mechanical vibration on gas fluidization of a fine aeratable powder10.1016/j.cherd.2007.10.002 ↗
18. Gas–solid fluidization in a centrifugal field10.1002/aic.690470509 ↗
19. Magnetic fluidization of Group C powder (I)—Mechanism
20. Study on magnetic fluidization of group C powders10.1016/0032-5910(96)83162-7 ↗
21. Enhanced fluidization of nanoparticles in an oscillating magnetic field10.1002/aic.10479 ↗
22. Fluidization of fine particles in a sound field and identification of group C/A particles using acoustic waves10.1016/j.powtec.2005.11.005 ↗
23. Improvement of the fluidizability of cohesive powders through mixing with small proportions of group A particles10.1002/cjce.5450830602 ↗
24. Fluidization of mixed SiO2 and ZnO nanoparticles by adding coarse particles10.1016/j.powtec.2014.07.045 ↗
25. Hirotaka, N., and Masakatsu, U. (2013). Powder-coated aluminum building material for outdoor use. (CN103154415 A).
26. Craven, J.M. (1983). Powder coating composition for automotive topcoat. (4402983), US Patent.
27. Gao, S., Zhu, X.P., Zhang, H., and Zhu, J. (2016, January 7–9). Powder coating of plastic components. Proceedings of the SPE Automotive Composites Conference & Exhibition, Novi, MI, USA.
28. Improving flowability of cohesive particles by partial coating on thesurfaces10.1002/cjce.20179 ↗
29. Group C+ particles: Enhanced flow and fluidization of fine powders with nano-modulation10.1016/j.ces.2019.06.056 ↗
30. Characterization of powder flow: Static and dynamic testing10.1016/j.powtec.2009.05.001 ↗
31. Li, W., Franco, D.C., Yang, M.S., Zhu, X., Zhang, H., Shao, Y., Zhang, H., and Zhu, J. (2019). Comparative study of the performances of Al(OH)3 and BaSO4 in ultrafine powder coatings. Processes, 7.10.3390/pr7050316 ↗
32. Bao, D. (2013). Effects of Additive Modification on Flow Properties of Fine Coating Particles. [Master’s Thesis, UWO].
33. Fluidization of powders showing degrees of cohesiveness—I. Bed expansion10.1016/0009-2509(84)80006-8 ↗
34. Xue, D. (2013). Study on Fine Powder Coating with Modified Additive. [Master’s Thesis, UWO].
35. ASTM D4217-07 (2013) (2013). Standard Test Method for Gel Time of Thermosetting Coating Powder, ASTM International.
36. ASTM D4242-07 (2017) (2017). Standard Test Method for Inclined Plate Flow for Thermosetting Coating Powder, ASTM International.
37. A novel methodology for the evaluation of distinctness of image of glossy surfaces10.1016/j.porgcoat.2008.06.008 ↗
38. Comparative evaluation of negatively and positively charged submicron particles as flow conditioners for a cohesive powder
39. The role of interparticle forces in the fluidization of fine particles10.1016/S0032-5910(97)03270-1 ↗
40. Effect of silica nanoparticles on the bulk flow properties of fine cohesive powders10.1016/j.ces.2013.06.056 ↗
41. Improving the antifouling properties of polypropylene surfaces by melt blending with polyethylene glycol diblock copolymers
42. A facile method to prepare superhydrophobic fluorinated polysiloxane/ZnO nanocomposite coatings with corrosion resistance10.1016/j.apsusc.2014.11.100 ↗
43. Effect of ambient relative humidity and surface modification on the charge decay properties of polymer powders in powder coating10.1109/TIA.2002.807234 ↗
44. Influence of humidity on current waveform and light emission of a low-frequency discharge controlled by a dielectric barrier10.1109/94.536733 ↗
45. Breaking through the faraday cage
46. Biris, A.S., De, S., Yurteri, C.U., Mazumder, M.K., and Sims, R.A. (2002, January 13–18). Parametric study of the Faraday cage effect of charged particles and its implications in the powder coating process. Proceedings of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No. 02CH37344), Pittsburgh, PA, USA.
47. Numerical investigation of powder trajectories and deposition in tribocharge powder coating10.1109/28.968167 ↗
48. The characteristics of particle charging and deposition during powder coating processes with ultrafine powder10.1088/0022-3727/42/6/065201 ↗
49. Curing of polyester powder coating modified with rutile nano-sized titanium dioxide studied by DSC and real-time FT-IR10.1007/s10973-011-1855-4 ↗
50. Curing of a thermosetting powder coating by means of DMTA, TMA and DSC10.1016/S0032-3861(03)00059-4 ↗
51. An investigation into the curing of epoxy powder coating systems10.1007/s10973-015-4411-9 ↗
52. Gloss reduction in low temperature curable hybrid powder coatings10.1016/S0300-9440(02)00197-2 ↗
53. Gloss and texture control of powder coated films10.1080/02726350290057804 ↗
54. Gooch, J.W. (2011). Distinctness-of-Image. Encyclopedic Dictionary of Polymers, Springer.10.1007/978-1-4419-6247-8 ↗
55. Visual gloss scaling and multidimensional scaling analysis of painted specimens10.1002/col.5080120606 ↗
56. The Role of Varnishes in Modifying Light Reflection from Rough Surfaces—A Study of Changes in Light Scattering Caused by Variations in Varnish Topography and Development of a Drying Model10.1179/sic.2008.53.3.170 ↗