Construction and Scale Inhibition Behavior of Phosphorus⁃free Green Carboxyl⁃terminated Hyperbranched Polyester

doi:10.19491/j.issn.1001-9278.2021.11.009

Abstract

Abstract:

Carboxyl terminated hyperbranched polyester as a phosphorus?free green scale inhibitor was successfully prepared through esterification with itaconic acid， triethanolamine and succinic acid as reaction monomers， and its scale inhibition and dispersion ability under different influence factors was studied by a static scale inhibition experiment. The biodegradability and ecological effects of the scale inhibitor were also determined. The results indicated that the scale inhibitor not only had good dispersibility for Fe₂O₃ but also had good scale inhibiting effect for CaCO₃ and CaSO₄ under wide temperature and pH ranges. When the dosage of scale inhibitor was 20 and 12 mg/L， the scale inhibition efficiency for CaCO₃ and CaSO₄ reached 93.8 % and 96.2 %， respectively. The XRD and SEM analysis showed that the scale inhibitor not only effectively destroyed the regularity of calcium scale crystal but also reduced the crystallinity of calcium scale. This can effectively inhibit the growth of calcium scale， achieving the purpose of scale inhibition and dispersion. In addition， the scale inhibitor had excellent biodegradability with a biodegradation rate of 67.2 % after 28 days. Moreover， the scale inhibitor does not affect the growth of microorganisms of water.

Key words: itaconic acid, industrial circulating water, carboxyl terminated hyperbranch, biodegradability, scale inhibitor and dispersant

CLC Number:

TQ 325

LI Meilan, HE Jiao, GONG Wei, HE Xiaoni, LAI Qian, LIU Bailing. Construction and Scale Inhibition Behavior of Phosphorus⁃free Green Carboxyl⁃terminated Hyperbranched Polyester[J]. China Plastics, 2021, 35(11): 55-63.

Figures/Tables 14

Fig.1. Preparation of phosphorus?free green carboxyl terminated hyperbranched polyester

Fig.2. FTIR spectra of phosphorus?free green carboxyl terminated hyperbranched polyester

Fig.3. 1H?NMR spectra of phosphorus?free green carboxyl terminated hyperbranched polyester

Fig.4. Influence of phosphorus?free green carboxyl terminated hyperbranched polyester concentration on scale inhibition efficiency

Fig.5. Relationship between scale inhibition efficiency of phosphorus?free green carboxyl terminated hyperbranched polyester and pH of solution

Fig.6. Effect of temperature on scale inhibition of phosphorus?free green carboxyl terminated hyperbranched polyester

项目	透光率/%	Zeta电位/mV
H₂O	94.2	-5.2
衣康酸	67.1	-13.4
无磷型绿色端羧基超支化聚酯	29.6	-24.7

Tab.1. Dispersion performance of phosphorus?free green carboxyl terminated hyperbranched polyester

Fig.7. XRD spectra of calcium sulfate scale

Fig.8. SEM of calcium sulfate scale

Fig.9. Relationship of electric conductivity of solution and calcium sulfate nucleation time

Fig.10. XRD spectra of CaCO3

Fig.11. SEM of CaCO3

Fig.12. Biodegradability of phosphorus free green carboxyl terminated hyperbranched polyester

项目	细菌/个·g^-1	放线菌/个·g^-1	真菌/个·g^-1
对照组	9.13×10⁷	4.71×10³	5.03×10⁵
端羧基超支化阻垢剂	9.81×10⁷	3.96×10³	5.27×10⁵

Tab.2. Microbial growth of phosphorus free green carboxyl terminated hyperbranched polyester after 21 days of scale inhibition in circulating water （simulated）

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