Method for preparing alpha-Fe2O3-coated pearlescent pigment by low-temperature catalysis

A pearlescent pigment and low-temperature catalysis technology, applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of complex process and high energy consumption, and achieve the effect of simple preparation process, energy saving and pure color

Inactive Publication Date: 2013-02-06
HEBEI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alkali neutralization method in the chemical liquid phase deposition method is currently the most common method used in the industrial production of pearlescent pigments in the world. This method uses ferric salt as raw material, the product quality is stable, and the pollution is less. However, this method has complex processes and energy consumption. Large and other disadvantages

Method used

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  • Method for preparing alpha-Fe2O3-coated pearlescent pigment by low-temperature catalysis
  • Method for preparing alpha-Fe2O3-coated pearlescent pigment by low-temperature catalysis

Examples

Experimental program
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Effect test

Embodiment 1

[0016] First, weigh 10g of mica particles, put them into a four-necked flask in an electronic constant temperature water bath, add 300ml of deionized water, raise the temperature of the solution to 75°C, adjust the pH of the solution to 3.5, and add 0.2ml of Slowly add 25ml of 0.5mol / L FeCl at the speed of / min 3 Solution, add 1.52mol / L NaOH solution at the same time to keep the pH of the solution constant, after the addition is completed, press Fe 2+ with Fe 3+ The molar ratio is 0.04:1 by adding FeCl 2 Solution, the pH value of the mixed solution was adjusted to 7 with NaOH solution, and the temperature of the mixed solution was raised to 100° C. to react for 2 hours, then suction filtered, washed and dried to finally obtain the mica pearlescent pigment. X-ray diffraction results show that the oxide coated on the mica is α-Fe 2 o 3 (Such as figure 1 shown), and the coating layer is dense and uniform (such as figure 2 shown).

Embodiment 2

[0018] First, weigh 10g of mica particles, put them into a four-neck flask in an electronic constant temperature water bath, add 300ml of deionized water, raise the temperature of the solution to 75°C, adjust the pH of the solution to 3.5, and add 0.5ml of Slowly add 25ml of 0.5mol / L Fe at the speed of / min 2 (SO 4 ) 3 Solution, add 1.52mol / L NaOH solution at the same time to keep the pH of the solution constant, after the addition is completed, press Fe 2+ with Fe 3+ The molar ratio of 0.04:1 was added to FeSO 4 solution, adjust the pH value of the mixed solution to 7 with NaOH solution, and raise the temperature of the mixed solution to 100°C for 2 hours of reaction, then suction filter, wash and dry, and finally obtain dense, uniform and stable α-Fe 2 o 3 Encapsulated Pearlescent Pigment, α-Fe 2 o 3 The coverage rate is 9.09%.

Embodiment 3

[0020] First, weigh 10g of mica particles, put them into a four-neck flask in an electronic constant temperature water bath, add 300ml of deionized water, raise the temperature of the solution to 75°C, adjust the pH of the solution to 3.5, and add 0.5ml of Slowly add 25ml of 0.5mol / L Fe(NO 3 ) 3 Solution, add 1.52mol / L NaOH solution at the same time to keep the pH of the solution constant, after the addition is completed, press Fe 2+ with Fe 3+ The molar ratio is 0.04:1 by adding FeCl 2 solution, adjust the pH value of the mixed solution to 7 with NaOH solution, and raise the temperature of the mixed solution to 100°C for 2 hours of reaction, then suction filter, wash and dry, and finally obtain dense, uniform and stable α-Fe 2 o 3 Encapsulated Pearlescent Pigment, α-Fe 2 o 3 The coverage rate is 9.09%.

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Abstract

The invention discloses a method for preparing an alpha-Fe2O3-coated pearlescent pigment by low-temperature catalysis, which comprises the following steps: by using granular mica as a substrate, Fe<3+> salts as a reactant material and ferrites as a catalyst, firstly coating Fe(OH)3 on the mica, adding the catalyst, and directly converting at 90-103 DEG C to obtain the alpha-Fe2O3-coated pearlescent pigment. According to the invention, the alpha-Fe2O3-coated pearlescent pigment is directly synthesized at low temperature, thereby avoiding the high-temperature calcination step adopted in the traditional method, simplifying the preparation technique and saving the energy. The invention has the advantage of simple preparation technique, and is easy for large-scale industrial production.

Description

technical field [0001] The invention relates to a low-temperature catalytic method for preparing mica iron oxide pearlescent pigments, which belongs to the technical field of pigment preparation. Background technique [0002] Mica iron oxide pearlescent pigment is an important kind of colored pearlescent pigment. It has excellent characteristics such as soft luster, good decorative effect, non-toxicity, light resistance, heat resistance, wear resistance, and good chemical stability. It is used in decorative coatings for high-end cars, military Equipment camouflage coatings, plastics, leather, ink printing, ceramics, rubber, toys, cosmetics, decorations and other fields are widely used. In the prior art, there are mainly two methods for preparing mica pearlescent pigments: chemical vapor coating and chemical liquid deposition. Vapor phase coating technology is a technology developed from MOCVD (metal vapor deposition). Wang Xianxiang et al. used this method to prepare mica i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C3/06C09C1/28C09C1/40
Inventor 魏雨韩丽红
Owner HEBEI NORMAL UNIV
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