Preparation of a low‐phosphorous terpolymer as a scale, corrosion inhibitor, and dispersant for ferric oxide. Issue 6 (22nd September 2014)

• Record Type: Journal Article
• Authors: Chen, Yiyi; Zhou, Yuming; Yao, Qingzhao; Bu, Yunyun; Wang, Huchuan; Wu, Wendao; Sun, Wei
• Is Part Of: Journal of applied polymer science. Volume 132:Issue 6(2015:Mar. 15)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2014-09-22
• Subjects: Polymers -- Periodicals; Polymerization -- Periodicals; 668.9
• DOI: 10.1002/app.41447
• Languages: English
• ISSNs: 0021-8995

Abstract

<abstract abstract-type="main"> <title>ABSTRACT</title> <p>A novel low‐phosphorus terpolymer, used as scale, corrosion inhibitor, and dispersant for iron oxide, was prepared through free‐radical polymerization reaction of acrylic acid (AA), oxalic acid‐allypolyethoxy carboxylate (APEM), and phosphorous acid (H<sub>3</sub>PO<sub>3</sub>) in water with redox system of hypophosphorous and ammonium persulfate as initiator. Structure of the synthesized AA‐APEM‐H<sub>3</sub>PO<sub>3</sub> terpolymer was characterized by Fourier transform infrared spectrometer and <sup>1</sup>H‐NMR. The polymer possesses excellent scale inhibition performance for CaCO<sub>3</sub>, outstanding ability to disperse ferric oxide, and good corrosion inhibition properties. The study showed that AA‐APEM‐H<sub>3</sub>PO<sub>3</sub> exhibited excellent ability to control calcium carbonate scale, with approximately 90.16% CaCO<sub>3</sub> inhibition at a level of 8 mg/L AA‐APEM‐H<sub>3</sub>PO<sub>3</sub>. The data of the light transmittance showed that, compared to hydrolyzed polymaleic acid and polyepoxysuccinic acid, AA‐APEM‐H<sub>3</sub>PO<sub>3</sub> had superior ability to control iron ions scaling. The light transmittance of the solution was about 24.1% in the presence of the terpolymer when the dosage was 8 mg/L. Moreover, the corrosion inhibition efficiency could reach up to 79.77% at a dosage of 30 mg/L, with ethylene diamine tetra methylene phosphonic acid just 39.62%. Scanning electronic microscopy, transmission electron microscope, and X‐ray powder diffraction analysis were used to investigate the effect of AA‐APEM‐H<sub>3</sub>PO<sub>3</sub> on morphology of calcium carbonate scale. The low‐phosphorous terpolymer has also been proven to be effective inhibitor of calcium carbonate even at increasing solution temperature, pH, and Ca<sup>2+</sup> concentration. The proposed inhibition mechanism suggests the surface complexation and chelation between the functional groups P(O) (OH)<sub>2</sub>, COOH and Ca<sup>2+</sup>, with polyethylene glycol segments increasing its solubility in water. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. <bold>2015</bold>, <italic>132</italic>, 41447.</p> </abstract>