塗料
Thickener and stabiliser for water-based paint
- Background
Paints have played a role in the everyday life of mankind for tens of thousands of years.
More than 50 years ago, most liquid paints were solvent-based with strong odor and hazard to human health and the environment.
With the growing awareness for health and the environment in the late seventies, water-based paints which are free of organic solvents came out.
- Thickeners in Paints
Thickeners and stabilizers are essential ingredients for water-based paints. They give the desired rheological properties and contribute to the overall stability of the product. Depending on the required application, various thickener systems are available.
Xanthan gum is the right choice for applications where a high yield value and pseudoplastic behavior are required.
Xanthan gum can be used as an ingredient for paints certified under different ecolabels.
- Functions & Features & Advantages
Xanthan gum is a very effective stabilizer, soluble in both cold and hot water, stable at a wide range of pH, and is generally inert to other chemicals.
The addition of xanthan gum to water changes the rheological properties from Newtonian to pseudoplastic, thus exhibiting high viscosity at rest but thinning under shear stress.
The high viscosity at low shear rates and at rest results in stable suspensions of insoluble ingredients.
This enables good stabilisation of the paint during storage, as well as good adherence to the wall.
Paint thickened with xanthan gum exhibits shear thinning properties during application with a brush, roller or spray, but with minimised dripping in between applications.
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