硫酸法和氯化法钛白初品表面性能和分散性能研究

doi:10.19964/j.issn.1006-4990.2023-0596

Abstract

Abstract:

The water wettability and dispersibility of titanium dioxide is very important for the inorganic coating and application performance.Based on the different surface properties of titanium dioxide prepared by sulfuric acid method and chlorination method，the dispersion difference of titanium dioxide was studied in this paper.The slurry viscosity，particle size distribution and zeta potential of the two kinds of titanium dioxide were compared and analyzed.The morphology and structural properties of the different products were characterized by SEM，FT-IR，XPS，TG and surface contact angle measurement.The results showed that at the same concentration，the same pH，the same dispersant and its dosage，the viscosity of the titanium dioxide by sulfuric acid method was lower than that of the chlorination method after beating，and the absolute value of zeta potential was higher.XPS，TG and surface energy showed that the titanium dioxide by sulfuric acid method had more surface hydroxyl groups and surface energy，which was easier to be wetted and dispersed by water，and had better dispersion performance.In addition，when the dosage of dispersant A was 0.2% and the concentration of TiO₂ was 700 g/L，the viscosity of the sulfuric acid method initial slurry was 138 mPa·s with a Zeta potential of -62 mV，and the viscosity of the chloride method initial slurry was 4 927 mPa·s，with a Zeta potential of -28.4 mV.The results showed that the slurry viscosity of the sulfuric acid method was lower，the dispersion was better，and the water wetting dispersion was better.The structure-activity relationship between surface structure and water dispersity was established by analyzing the surface structure of titanium dioxide with different processes，which provided reference and ideas for the development of high-end titanium dioxide.

Key words: titanium dioxide, surface hydroxyl group, dispersibility, viscosity

CLC Number:

TQ621.1

QUAN Yuanxia, QUAN Xuejun, KE Lianghui, LI Li. Study on surface characteristics and dispersion properties of titanium dioxide base particles by sulfate and chloride processes[J]. Inorganic Chemicals Industry, 2024, 56(11): 123-131.

Figures/Tables 12

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样品	物种	电子结合能/eV	XPS分峰拟合面积	表面物种数/（个·nm^-2）
1^#氯化法钛白初品	Ti—O	529.39	184 073.01	6.89
1^#氯化法钛白初品	Ti—OH	531.35	59 405.32	2.22
2^#硫酸法钛白初品	Ti—O	529.43	144 208.37	6.45
2^#硫酸法钛白初品	Ti—OH	530.49	50 092.13	2.24

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Study on surface characteristics and dispersion properties of titanium dioxide base particles by sulfate and chloride processes

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