Effects of two kinds of viscoelastic surfactants on thickening and rheological properties of a self-thickening acid

Abstract

The self-thickening agent (TZXJ) consisting of acrylamide (AM), 1-carboxy-N, N′-dimethyl-N-(3-methyl-acrylamidopropyl) ethanaminium (CBMAA-1), [2-(Methacryloyloxy)ethyl]trimethylammonium chloride (DMC) and N, N′-dimethyl octadecyl allyl ammonium chloride (DOAC) was synthesized and characterized. Effects of two kinds of surfactants 2-(bis(2-hydroxyethyl)(octadecyl)ammonio)acetate (ODB) and N,N,N-trimethyloctadecan-1-aminium bromide (STAB) on thickening performance, temperature resistance and shear resistance of TZXJ acid solution were studied via six-speed rotational viscometer and HAAK MARSⅢ Rheometer. Results showed that the ODB and STAB as accelerators can greatly enhance the thickening ability and temperature resistance of TZXJ self-thickening acid. After TZXJ self-thickening spent acid with accelerators was sheared at 140 °C for 60 min, the apparent viscosity of spent acid can reach 204 mPa s. It was found that the research results provided a new research idea that a small amount of long-chain cationic or amphoteric surfactants may greatly improve the application performance of hydrophobic associative polymeric self-thickening acid.