Synthesis And Properties Of A Copolymer Of Boric Acid Ester Surfactant

Borate ester surfactant is a kind of special surfactants with excellent surfaceactivity, which possess many characteristic features compared with ordinary surfactants,e.g. antistatic, antiwear, flame retardancy, etc.. In the paper, novel non-ionic boratesurfmer BES and its BES/acrylamide copolymer P(BES-AM) were developed. Theeffects of several factors on polymerization were investigated, and optimized synthesistechniques were obtained. The structures of synthesized products were characterized byFT—IR, ¹H—NMR and intrinsic viscosity measurement. Using surface tension method,its surface physical-chemistry properties, e.g. surface activity, mixed solution effects.,were studied, and their applications in aqueous system, such as the metal corrosioninhibition were studied.The results showed that the intrinsic viscosity of copolymer borate P(BES-AM)was in the range of 0.23～0.87 mL·g^-1(calculated relative molecule weight was 4×10⁴～2×10⁵), andγ_cmc Was 30.5～40.5 mN·m^-1, cmc was 0.23～2.3 g·L^-1, which is close to thesurface activity of ordinary low-molecule-weight surfactants. P(BES-AM) also showedits good emulsification property which is even superior to Span-80. The mixed solutionsof P(BES-AM) with sodium dodecylbenzene sulfonate have obvious strong synergisticinteractions. P(BES-AM) has good metal corrosion inhibition property which is superiorto regular inhibitor OP-10, Tween-85. The inhibition effect of P(BES-AM) on thecorrosion of 45# carbon steel in 1 mol·L^-1 HCl solution at 30℃and 50℃exceed 87％.