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The Difference Between Coupling Agents And Surfactants
Nov 07, 2018

In the process of coating manufacture, it is necessary to disperse hydrophilic polar material pigments and fillers into hydrophobic non-polar material organic base materials. In order to increase the affinity between inorganic substances and organic polymers, the surface of inorganic substances should be treated with coupling agents or other surfactants, so as to change it from hydrophilic to hydrophobic, thus promoting the interface between inorganic substances and organic substances.


Coupling agents and surfactants are similar in molecular structure and application performance, but there are also differences. The two are composed of two groups, hydrophobicity and hydrophobicity. Surfactants form monolayer on the surface of inorganic pigments and fillers by directional adsorption of hydrophilic groups in molecules. This is a physical adsorption phenomenon, which improves the dispersibility and wettability of pigments and fillers in the matrix. Therefore, it is only physical adsorption, so the migration of surfactants affects the gloss, appearance and adhesion. Coupling agent is the combination of chemical reaction and surface of inorganic pigments and fillers and crosslinking with polymer base materials. It combines two different kinds of substances and acts as a bridge. From the bonding strength, the dispersion process of pigments and fillers in the base materials is improved, and the range of interfacial free energy is reduced, the coupling agent is much better than the surface activity. Agent.


Hangzhou Jessica Chemicals Co,Ltd

Address: Hangzhou Jessica Chemicals Co.,Ltd 206 Zhenhua RD,West Lake Technological Park,Hangzhou,China

Tel: +86-571-87007704

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