Abstract
The purpose of the paper is to provide a non-phosphorus and nitrogen free calcium phosphate inhibitor maleic anhydride-allyloxy polyethoxy carboxylate. The approach is that synthesized monomer allyloxy polyethoxy carboxylate from allyloxy polyethoxy ether and chloracetic acid, and then prepared maleic anhydride-allyloxy polyethoxy carboxylate by free radical polymerization. Structures of allyloxy polyethoxy carboxylate and maleic anhydride-allyloxy polyethoxy carboxylate were characterized through FT-IR and 1H-NMR. Influence of monomer mole ratio in maleic anhydride-allyloxy polyethoxy carboxylate and viscosity-average molecular weight of maleic anhydride-allyloxy polyethoxy carboxylate on its calcium phosphate inhibition performance was discussed. Calcium tolerance and calcium phosphate inhibition capability of maleic anhydride-allyloxy polyethoxy carboxylate was compared with the latest generation of calcium phosphate inhibitor maleic anhydride-ammonium allylpolyethoxy sulphate, and other two kinds of known inhibitor acrylic acid/2-hydroxypropyl acrylate and acrylic acid/acrylamido-2-methyl-1-propane sulfonic acid. As a result, monomer mole ratio and viscosity-average molecular weight has great impact on property of maleic anhydride-allyloxy polyethoxy carboxylate. Calcium tolerance and calcium phosphate inhibition of maleic anhydride-allyloxy polyethoxy carboxylate is similar to maleic anhydride-ammonium allylpolyethoxy sulphate. The results reveal that maleic anhydride-allyloxy polyethoxy carboxylate is an excellent green calcium phosphate inhibitor.
Kurzfassung
Das Ziel dieser Arbeit ist die Bereitstellung eines phosphor- und stickstofffreien Kalziumphosphatinhibitors aus Maleinsäureanhydrid-Allyloxypolyethoxycarboxylat. Der Ansatz ist, dass aus Allyloxypolyethoxyether und Chloressigsäure synthetisiertes Allyloxypolyethoxycarboxylat-Monomer dann durch Radikalpolymerisation zu Maleinsäureanhydrid-Allyloxypolyethoxycarboxylat dargestellt wird. Die Strukturen von Allyloxypolyethoxycarboxylat und Maleinsäureanhydrid-Allyloxypolyethoxycarboxylat wurden durch FT-IR und 1H-NMR charakterisiert. Der Einfluss des molaren Verhältnisses an Monomer und Viskositätsmittel des Molekulargewichtes von Maleinsäureanhydrid-Allyloxypolyethoxycarboxylat auf die Leistung der Kalziumphosphatinhibition wird diskutiert. Die Kalziumtoleranz und das Leistungsvermögen der Kalziumphosphatinhibition von Maleinsäureanhydrid-Allyloxypolyethoxycarboxylat wurde mit der neuesten Generation von Kalziumphosphatinhibitoren, Maleinsäureanhydrid-Amoniumallyloxypolyethoxysulfat sowie mit zwei weiteren bekannten Inhibitoren, Acrylsäure/2-hydroxypropylacrylat und Acrylsäure/Acrylamido-2-methyl-1-propansulfonsäure, verglichen. Das molare Verhältnis an Monomer und das Viskositätsmittel des Molekulargewichtes haben eine große Auswirkung auf die Eigenschaften von Maleinsäureanhydrid-Allyloxypolyethoxycarboxylat. Die Kalziumtoleranz und die Kalziumphosphatinhibition von Maleinsäureanhydrid-Allyloxypolyethoxycarboxylat ist ähnlich wie die von Maleinsäureanhydrid-Amoniumallyloxypolyethoxysulfat. Die Ergebnisse machen deutlich, dass Maleinsäureanhydrid-Allyloxypolyethoxycarboxylat ein ausgezeichneter, grüner“ Kalziumphosphatinhibitior ist.
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