Index of emulsifier for waterproof coating – Stearyl trimethyl ammonium chloride

2021-09-25   Pageview:113

Chemical composition: octadecyl trimethyl ammonium chloride (1831)

Technical indicators:
Appearance: light yellow solid
Active matter content, %: 70±2.0
Free amine content, %: ≤2.0
pH value (10% aqueous solution): 6.0 ~ 8.0

 

 

 

 

 

 

 

 

 

 

 

When the pH value is higher than 10, the high concentration of electrolyte will worsen the colloidal state. Acrylic thickeners are suitable for architectural coatings, inks, industrial paints, automotive paints and textile printing. The polymer emulsion completely dissolved in alkaline medium constitutes the first generation of water-soluble flexographic ink and gravure printing ink. The thickening structure of alkali swelling emulsion thickeners depends on the pH value.

Associative thickener
Associative thickeners have a different mechanism than hydrated gel thickeners. The associative structure contains emulsion particles and pigment/filler particles. Compared with cellulose and acrylate thickeners, the molecular weight of associative thickeners is much lower, and its hydrophilic end or side chain Forms water-soluble polymers, usually with a structure similar to polymeric surfactants
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Similar to surfactants, the hydrophilic chain of the associative thickener extends into the water, while the hydrophobic end is adsorbed on the surface of the pigment/filler and the surface of the emulsion particle, or is partially dispersed in water to form micelles. The thickening principle is: the thickening mechanism of the cross-linking-associative thickener formed by the micelles in the water phase, and is connected in parallel with the emulsion particles and the pigment/filler particles.

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