Method for microwave and hydrothermal-assisted preparation of high-chroma cobalt blue/clay mineral hybrid pigment

A clay mineral, microwave hydrothermal technology, applied in chemical instruments and methods, inorganic pigment processing, dyeing physical processing, etc., can solve problems such as non-ideal and non-equilibrium conditions, and achieve improved sample blue value and high tinting strength. , the effect of reducing production energy consumption

Active Publication Date: 2019-01-11
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high temperature and high pressure, the medium water is in a critical state, and the physical and chemical reaction properties of the reactants in the water are greatly changed, so the preparation reaction is carried out in a non-ideal and non-equilibrium state.

Method used

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  • Method for microwave and hydrothermal-assisted preparation of high-chroma cobalt blue/clay mineral hybrid pigment
  • Method for microwave and hydrothermal-assisted preparation of high-chroma cobalt blue/clay mineral hybrid pigment
  • Method for microwave and hydrothermal-assisted preparation of high-chroma cobalt blue/clay mineral hybrid pigment

Examples

Experimental program
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Effect test

Embodiment 1

[0029] First, 1.09 g of kaolinite, 2.91 g of cobalt nitrate and 7.52 g of aluminum nitrate were added to 50 mL of water. After stirring and dissolving, the pH value of the system was adjusted to 8 with NaOH; the reaction solution was transferred to a microwave hydrothermal reactor (microwave reactor The power is 700W), reacted at 240°C for 1 h and cooled to room temperature to obtain the precursor; the precursor was centrifuged and washed at 900°C for 1 h to obtain a high-chroma cobalt blue / kaolinite hybrid pigment, corresponding to The sample number is S1. See Table 1 for the L*, a*, and b* color values ​​of S1.

Embodiment 2

[0031] First, 1.09 g of halloysite, 2.91 g of cobalt nitrate and 15.04 g of aluminum nitrate were added to 50 mL of water. After stirring and dissolving, the pH value of the system was adjusted to 12 with NaOH, and the reaction solution was transferred to a microwave hydrothermal reactor (microwave reactor The power is 800W), reacted at 240°C for 0.5 h and then cooled to room temperature to obtain the precursor; the precursor was centrifuged and washed at 900°C for 2 h to obtain a high-chroma cobalt blue / halloysite hybrid pigment. The corresponding sample number is S2. See Table 2 for the L*, a*, and b* color values ​​of S2.

Embodiment 3

[0033] Add 2.18 g of dickite, 2.91 g of cobalt acetate and 6.84 g of aluminum sulfate into 50 mL of water, stir and dissolve, adjust the pH value of the system to 10 with NaOH, and transfer the reaction solution to a microwave hydrothermal reactor (microwave reactor’s The power is 600W), reacted at 200°C for 2 h and then cooled to room temperature to obtain the precursor; the precursor was centrifuged and washed at 800°C for 0.5 h to obtain a high-chroma cobalt blue / dickite hybrid pigment, corresponding to The sample number is S3. See Table 2 for the L*, a*, and b* color values ​​of S3.

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Abstract

The invention discloses a method for microwave and hydrothermal-assisted preparation of a high-chroma cobalt blue/clay mineral hybrid pigment. The method comprises the following steps: uniformly dispersing natural clay mineral in water, adding soluble a Co<2+> salt and an Al<3+> salt, performing stirring to achieve dissolving, and adjusting the pH value of the obtained solution to 8-12 by a NaOH solution; transferring the obtained reactant material into a microwave reactor, and carrying out a hydrothermal reaction to obtain a precursor; and centrifuging and washing the precursor, and carryingout high-temperature calcination to obtain the high-chroma cobalt blue/clay mineral hybrid pigment. The method combines the technological advantages of a microwave heating technology and a traditionalhydrothermal technology, so the method has the advantages of short reaction period, and low temperature of calcination for forming spinel cobalt blue, and the obtained pigment product has the advantages of high crystal phase purity, excellent weather resistance and bright color, has a blue value b<*> being higher than -70, and can be comparable to blue organic pigments.

Description

technical field [0001] The present invention relates to a preparation method of cobalt blue / clay mineral hybrid pigment, relates to a microwave hydrothermal assisted preparation method of high chroma cobalt blue / clay mineral hybrid pigment, and belongs to the preparation technology of nano spinel hybrid pigment field. Background technique [0002] Cobalt blue, also known as cobalt aluminate, is an important spinel-type environmentally friendly inorganic pigment, which has broad application prospects in the fields of high-temperature resistant coatings, ceramic pigments and engineering plastics. At present, the solid phase method is the traditional preparation method of cobalt blue pigment, but because the reaction rate is affected by the diffusion kinetics, the material reaction is time-consuming and energy-consuming, and the color of the cobalt blue pigment obtained is not bright enough. At the same time, due to the high price of cobalt compounds, cobalt blue pigments have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/40C09C1/42C09C1/00C09C3/04C09C3/06
CPCC01P2006/62C01P2006/63C01P2006/64C09C1/00C09C1/0081C09C1/407C09C1/42C09C3/006C09C3/04C09C3/06
Inventor 牟斌王爱勤张安杰王晓雯惠爱平
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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