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Qing Zhang - Practical High Throughput Formulating and Analysis of Architectural Paints for Improved Pigment Efficiency, Performance and Balance of Properties

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Qing Zhang - Practical High Throughput Formulating and Analysis of Architectural Paints for Improved Pigment Efficiency, Performance and Balance of Properties

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Qing Zhang

Associate Scientist

Dow Chemical Company

Phone: 610-244-6621

Website: http://coatings.dow.com/en

Co-Authors: James Bohling, Stephanie Bortko

 

Abstract

High throughput research methods have become more widely used in architectural coating industry research in recently years. This technique combines state-of-the-art automated paint formulation, testing and the critical statistical analysis of the results to allow significantly more variables to be explored and the results to be mapped out more fully than could be achieved by employing traditional approaches. 

Titanium Dioxide (TiO2) is the predominant pigment used in architectural coatings however its light scattering efficiency decreases at higher concentration loadings in dried paint films due to crowding of the TiO2 particles.  Properties such as hiding, stain resistance and exterior durability can suffer as a result of this and related issues. Among the approaches developed to address these issues, adsorbing latex polymer has been proved to be very efficient to increase the light scattering efficiency of TiO2 by forcing the pigment into a more uniform distribution in the dried paint film yielding not only higher pigment efficiency but also improved barrier properties.

In this work, a high throughput investigation of waterborne architectural coatings formulated with conventional and adsorbing latex binders along with opaque polymers were conducted. The study covers a large formulation space (from semigloss to flat) and several important formulating variables including the levels of TiO2, opaque polymer and extender, the type of rheology modifier, and the type of binder, etc. The impacts of adsorbing latex polymer on some of the key paint properties including hiding, stain resistance, scrub resistance, and burnish resistance in different formulation spaces are mapped and summarized. One of the interesting findings from this study was a synergistic effect between the adsorbing latex polymer and opaque polymer, resulted in enhanced burnish resistance at equal hiding.

 

Biography

 

Dr. Qing Zhang is currently an associate scientist in Dow Coating Materials in Dow Chemical Company in Collegeville, PA. He got his Bachelor and Master degree in Tsinghua University in Beijing, China, and his PhD degree in Cornell University in Ithaca, NY. Dr. Zhang started his career at Dow in 2011 in the Architecture Coatings group in Dow Coating Materials. Since then he has been working on Dow’s Evoque Precomposite technology and Next Generation Opaque Polymer technology. He has co-authored 12 peer reviewed journal papers and 5 issued US patents

 

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