Al（OH）3@Zn（OH）2双层包覆氧化铁黄合成及其耐热性能研究

doi:10.19964/j.issn.1006-4990.2021-0220

Abstract

Abstract:

The iron oxide yellow pigment was coated with double layer heterogeneous Al（OH）₃/Zn（OH）₂ by coprecipitation method to improve its heat resistance.The microstructure of iron oxide yellow pigment before and after coating was character-ized by XRD,TG-DTA,FT-IR,SEM & EDS technologies.The research results showed that the heat resistance of iron oxide yellow pigment coated with 40% of Al（OH）₃ was better,and the optimal coating amount was 30% when the second layer was coated with Zn（OH）₂,and the color difference of the sample was 1.84 at 240 ℃.XRD results showed that coating of Al（OH）₃ and Zn（OH）₂ did not change the characteristic peak of iron oxide yellow,and they may be coated on the surface of iron oxide yellow in amorphous form.SEM,EDS and FT-IR tests showed that Al（OH）₃/Zn（OH）₂ had successfully coated the iron yellow pigment.In addition,the flake structure was corresponding to the nucleation of Al（OH）₃ itself,and the agglomeration occured after zinc hydroxide coating.TG-DTA characterization showed that the sample with coating was heated and dewatered in two steps.The low temperature endothermic peak was corresponding to the dehydration of the coating material,while the high temperature endothermic peak tended to higher temperature,which was corresponding to the improvement of the heat resistance of the coating pigment.

Key words: iron oxide yellow, aluminium hydroxide, zinc hydroxide, coating, heat resistance

CLC Number:

TQ138

ZHOU Kai,PAN Guoxiang,LI Jinhua,XIA Shengjie,XU Minhong,SHEN Hui,KOSO Aoki. Study on preparation and heat resistance of iron oxide yellow coated with double layer Al（OH）₃@Zn（OH）₂[J]. Inorganic Chemicals Industry, 2022, 54(2): 50-53.

Figures/Tables 6

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Table 1

References 15

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样品	ΔL	Δa	Δb	ΔE
FeOOH	-8.96	5.13	-12.18	15.97
Fe-0.15Al	-5.03	3.26	-6.57	8.89
Fe-0.25Al	-3.60	2.61	-5.02	6.70
Fe-0.4Al	-2.70	1.89	-4.02	5.20
Fe-0.4Al-0.1Zn	-1.64	1.17	-2.34	3.08
Fe-0.4Al-0.2Zn	-0.78	1.34	-1.49	2.15
Fe-0.4Al-0.3Zn	-0.94	0.84	-1.35	1.84
Fe-0.4Al-0.4Zn	-1.68	0.93	-2.16	2.89
Fe-0.4Al-0.5Zn	-1.49	0.96	-2.14	2.78

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on preparation and heat resistance of iron oxide yellow coated with double layer Al（OH）₃@Zn（OH）₂

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Study on preparation and heat resistance of iron oxide yellow coated with double layer Al（OH）3@Zn（OH）2