A new coalescing agent for high performance waterborne paint 3rd February 2020
By Marina C. Passarelli, Juliane P. Santos, Natália F. Paula, Robson A. Pagani, Rafael A. Caldato, Raquel da Silva and Silmar B. Barrios
The experts at Oxiteno explain the science behind their new low VOC, high-performance coalescing agent for waterborne paint. &n
- Stage 1: Evaporation of water and packaging of polymer particles.
- Stage 2: Evaporation of water and deformation of particles with formation of a transparent and brittle film.
- Stage 3: Coalescence or interdiffusion of polymer chains from one particle to another, promoting the formation of a continuous, homogeneous film with high mechanical strength. Coalescence will only occur if the Glass Transition Temperature (Tg) of the polymer is below room temperature.
Results at a glance
Hardness development data show that paint formulated with ULTRAFILM 5000 develops greater hardness than paint formulated with Competitor 2 (2,2,4-trimethyl-1,3-pentanediol diisobutyrate), although both coalescing agents have a boiling point around 280oC. After 7 days of drying, paint formulated with ULTRAFILM 5000 has a hardness similar to paint formulated with Competitor 1 boiling at 254oC (Figure 3).
The excellent hardness evolution of ULTRAFILM 5000 formulated inks is a differential of ULTRAFILM 5000 from market coalescing agents with a boiling point greater than 280oC, allowing it to be used to formulate low VOC interior and exterior paints.
- Gilbert JA. The Waterborne Symposium 2016.
- Barrios SB. Manual Descomplicado de Tecnologia de Tintas, Blucher, São Paulo, 2017.
- GS-11-Green Sea™ Environmental Standard for Paints and Coatings, Edição 2.1, 12 Julho, 2013.
- Juhué D et al, J Polymer Sci Part B 1995;33:1123–33.
ULTRAFILM 5000 is a registered trademark of Oxiteno.