During recent years, the interest in using solvent-based alkyd paints has increased. They are used primarily in the decorative and protective industry, especially in stains and primers for exterior use. One significant problem of using solvent-borne alkyd paints is their high volatile organic compounds emissions, leading to stricter regulations on their use in certain regions. With public awareness and the industry showing higher responsibility towards the environment, alkyd emulsions with lower volatile organic compounds have been gaining attention.
Emulsifiers are used in solvent-based alkyd paints to stabilize the mixture and prevent separation. They help maintain the homogeneity of the paint, improve the application properties, and enhance the durability of the film. The choice of emulsifier depends on various factors such as the intended application and desired properties of the paint film. A recent study shows the emulsifier can also serve as a volatile organic compound reducer in solvent-borne paint by promoting the inclusion of water to replace part of the organic solvents in the paint formulation
Chemnol-318 is Sauradip’s new and environmentally friendly film-forming polysaccharide emulsifier, formulated to improve incorporation of water into solvent-borne alkyd paints. By adding Chemnol 318 into the formulation, 10% of the organic solvent can be replaced with water without causing any significant change in the performance. It can further substitute 20-30% of the solvent with minor effect on the viscosity and gloss of the paint. Subsequently, the volatile organic compounds coming from the organic solvent and overall cost can be reduced.
Chemnol 318 prevents the development of cracks in the film by forming hydrogen bonds with the alkyd to prevent evaporation of the water. This results in a harder film due to molecular interactions with the alkyd, aiding the formation and stabilization of the water-in-oil emulsion
| No | Test | Without water addition | 10% Water addition | 20% Water addition | 30% Water addition |
|---|---|---|---|---|---|
|
1 |
Viscosity in KU at 28°C |
60 |
69 |
81 |
83 |
|
2 |
Opacity |
Control |
99.92 |
99.56 |
100 |
|
3 |
Whiteness Index |
62.95 |
63.05 |
63.43 |
63.59 |
|
4 |
Grinding (Hagman) |
7 |
7 |
7 |
7 |
|
5 |
Specific Gravity |
1.09 |
1.12 |
1.13 |
1.14 |
|
6 |
Drying Time |
|
|
|
|
|
|
Touch Dry |
2 Hrs |
2 Hrs |
2 Hrs |
2 Hrs |
|
|
Hard Dry |
6 Hrs |
6 Hrs |
6 Hrs |
6 Hrs |
|
7 |
Gloss at 60° |
94.9 |
93 |
91.5 |
88 |
|
|
Stability at 60°C (15 Days) |
|
|
|
|
|
1 |
Viscocity in Ku at 28°C |
58 |
66 |
78 |
80 |
|
2 |
Opacity |
Control |
99.98 |
99.56 |
100.1 |
|
3 |
Whiteness Index |
53.26 |
53.48 |
53.47 |
53.85 |
|
4 |
Syneresis |
No |
No |
No |
No |
|
5 |
Separation |
Slightly |
Slightly |
Slightly |
Slightly |
|
6 |
Setting |
Soft |
Soft |
Soft |
Soft |
|
7 |
Drying Time |
|
|
|
|
|
|
Touch Dry |
2 Hrs |
2 Hrs |
2 Hrs |
2 Hrs |
|
|
Hard Dry |
6 Hrs |
6 Hrs |
6 Hrs |
6 Hrs |
|
8 |
Grinding (Hagman) |
7 |
7 |
7 |
7 |
|
9 |
Gloss at 60° |
97 |
98 |
93 |
86 |
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