Carboxylate surfactants are the oldest surfactants, they are still widely used in various fields. For example, soap that commonly used in daily life is a typical carboxylate surfactant.
The surfactants having carboxylate (-COO-) functional group.
——CnH2n+1: alkyl carboxylate;
——CnH2n-1: alkenyl carboxylate;
( CH2CH2O ) m: saturated fatty alcohol polyoxyethylene ether carboxylate;
( CH2CH2O ) m: unsaturated fatty alcohol polyoxyethylene ether carboxylate;
——: phenol polyoxyethylene ether carboxylate;
——Rosin acid and its derivatives: abietates;
——Naphthenic base: naphthenate;
——: lactoyl lactate;
——, R1: EO, PO or EO/PO: amide polyether carboxylate;
——Amino group: amino acid salt. As follows:
——: alanine salt;
——: glycine salt;
——: lysine salt;
——: beta-alanine salt;
——: phenylalanine salt;
——Hydrolyzed protein salts (mixtures of amino acid salts).