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

摘要/Abstract

摘要：

钛白粉初品的水润湿分散性对无机包膜及应用性能至关重要。鉴于硫酸法和氯化法钛白初品表面性质的不同，对其进行钛白粉分散性的差异性能研究。对比分析了两种钛白粉浆料的黏度、粒度分布和Zeta电位差异，采用SEM、FT-IR、XPS、TG及表面接触角测量等方法对不同初品进行了形貌和结构表征。结果表明，在相同的浓度、pH、分散剂及其投加量条件下，硫酸法初品相较于氯化法初品在打浆后的黏度更低，Zeta电位的绝对值更高。XPS、TG及表面能的分析结果均表明，硫酸法初品具有更多的表面羟基和更高的表面能，因此更容易被水润湿和分散，展现出更优的分散性能。此外，在分散剂A质量分数为0.2%、TiO₂质量浓度为700 g/L条件下，硫酸法初品浆料黏度为138 mPa·s、Zeta电位为-62 mV；氯化法初品浆料黏度为4 927 mPa·s、Zeta电位为-28.4 mV，表明硫酸法初品的浆料黏度较低，分散性更好，水湿润分散性也更为优异。通过分析研究不同工艺制备的钛白初品的表面结构，建立了表面结构与水分散性之间的构效关系，这为开发高端钛白粉提供了借鉴和思路。

关键词: 二氧化钛, 表面羟基, 分散性, 黏度

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

中图分类号:

TQ621.1

全远霞, 全学军, 柯良辉, 李礼. 硫酸法和氯化法钛白初品表面性能和分散性能研究[J]. 无机盐工业, 2024, 56(11): 123-131.

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.

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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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