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A kind of magnetic pearlescent pigment and preparation method thereof

A pearlescent pigment and magnetic technology, used in inorganic pigment processing, chemical instruments and methods, fibrous fillers, etc., can solve the problems of high equipment and operation requirements, difficult to grasp the proportion and other problems

Inactive Publication Date: 2011-12-07
WENZHOU UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above-mentioned method, when oxidizing ferrous iron with an oxidant, it is difficult to grasp the exact ratio, because the ferrous iron itself is easily oxidized when exposed to air; the reduction of mica / Fe in a reducing atmosphere 2 o 3 high demands on equipment and operation

Method used

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  • A kind of magnetic pearlescent pigment and preparation method thereof
  • A kind of magnetic pearlescent pigment and preparation method thereof
  • A kind of magnetic pearlescent pigment and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Put 100ml of boiled deionized water and 10g of mica in a beaker and stir it magnetically to form a suspension. In the case of nitrogen, a certain molar ratio of FeCl was pumped with a peristaltic pump 3 ·6H 2 O and FeCl 2 4H 2 The mixed solution of O is dropped into the beaker drop by drop, and the pH value is adjusted to be constant with a pH regulator. In this embodiment, five pH values ​​are set, namely pH=8.9, pH=9.2, pH=9.5, pH=9.8, pH =10.1, fix the other 4 factors, that is, the reaction temperature t=30°C, the NaOH concentration is 0.5mol / L, Fe 3+ :Fe 2+ =1.364:1, the stirring speed is υ=138r / min~51r / min, after the reactants are added dropwise, continue to stir for 0.5 hours to make the reaction more complete; then suction filtration, washing, 60 ℃ vacuum drying; finally in the tube In the furnace, calcine at 350°C for 3 hours under nitrogen gas. Fe under 5 different pH values ​​can be prepared altogether by the method of this embodiment 3 o 4 / Mica pear...

Embodiment 2

[0034] Put 100ml of boiled deionized water and 10g of mica in a beaker and stir it magnetically to form a suspension. In the case of nitrogen, a certain molar ratio of FeCl was pumped with a peristaltic pump 3 ·6H 2 O and FeCl 2 4H 2 The mixed solution of O is dropped into the beaker drop by drop, and the pH is adjusted to be constant at 9.2 by a pH regulator. In this embodiment, five NaOH concentration values ​​are set, which are 2mol / L, 1.5mol / L, 1.0mol / L, 0.5 mol / L, 0.25mol / L, fix the other three factors, that is, the reaction temperature t=30℃,, Fe 3+ :Fe 2+ =1.364:1, the stirring speed is υ=138r / min~51r / min, after the reactants are added dropwise, continue to stir for 0.5 hours to make the reaction more complete; then suction filtration, washing, 60 ℃ vacuum drying; finally in the tube In the furnace, calcine at 350°C for 3 hours under nitrogen gas. Fe under 5 different NaOH concentrations can be prepared altogether by the method of this embodiment 3 o 4 / Mica pe...

Embodiment 3

[0036] Put 100ml of boiled deionized water and 10g of mica in a beaker and stir it magnetically to form a suspension. In the case of nitrogen, a certain molar ratio of FeCl was pumped with a peristaltic pump 3 ·6H 2 O and FeCl 2 4H 2 The mixed solution of O is dripped in the beaker drop by drop, and utilizes the pH adjuster to regulate pH=9.2 constant, present embodiment sets 5 The molar concentration ratio of , fix the other 3 factors, that is, the reaction temperature t = 30 ℃, the NaOH concentration is 0.5mol / L, the stirring speed is υ = 138r / min~51r / min, after the reactant is added dropwise, continue to stir for 0.5 hours, so that The reaction is more complete; then suction filtration, washing, and vacuum drying at 60°C; finally, calcination in a tube furnace at 350°C for 3 hours under nitrogen. A total of 5 different Fe at a molar concentration ratio of 3 o 4 / Mica pearlescent pigment. The performance test results of the prepared pigments are shown in Table 3...

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Abstract

The invention discloses a magnetic pearlescent pigment and a preparation method thereof. The magnetic pearlescent pigment has black luster, and a substrate with a particle diameter of 10-60 μm is used as a coating substrate, and the substrate is coated with Fe3O4. The preparation method of the magnetic pearlescent pigment is to drip ferric and ferrous salt solutions into the mica suspension at a certain temperature, and under the protection of an inert gas, control the pH of the co-precipitation to allow the precipitated Iron ferric oxide is uniformly and densely deposited on the mica, and calcined in an inert atmosphere, so as to prepare the magnetic pearlescent pigment. The surface deposition of the magnetic pearlescent pigment prepared by the invention is smooth and dense, the coating rate is high, and the pearlescent effect is obvious. The preparation method realizes the co-deposition of ferric iron and ferrous iron, so that ferric ferric oxide can be uniformly coated on the sericite substrate. The invention is applicable to the preparation of various pearlescent pigments, and the introduction of the co-precipitation method and the control of the sintering atmosphere provides the possibility for the deposition and coating of oxides in different valence states.

Description

(1) Technical field [0001] The invention belongs to the field of decorative pigments such as paints, inks, printing and dyeing, and coatings, and in particular relates to a magnetic pearlescent pigment and a preparation method thereof. (2) Background technology [0002] Mica pearlescent pigments are made of natural mica flakes as the base material, and are formed by continuously coating one layer or alternately coating multiple layers of metal oxides through a special production process. This kind of oxide film has a higher light refraction index than the base material, and is itself transparent, so it interferes with the reflection and transmission of light. The luster of the film is as soft as pearls and gives a three-dimensional texture. Since the invention of DuPont in 1963, this kind of pigment has been rapidly developed and widely used as a functional material mica pearlescent pigment. With its stable performance, rich raw materials and safe and non-toxic characteristi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/00C09C3/06
Inventor 梁晓娟向卫东陈静陈仙德杨新宇张景峰林须泽徐燎
Owner WENZHOU UNIVERSITY
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