Magnetic pearlescent pigment and preparation method thereof

A pearlescent pigment and magnetic technology, applied in the direction of inorganic pigment treatment, chemical instruments and methods, fibrous fillers, etc., can solve problems such as difficult to grasp the ratio, high equipment and operation requirements

Inactive Publication Date: 2009-06-03
WENZHOU UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 i

Method used

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  • Magnetic pearlescent pigment and preparation method thereof
  • Magnetic pearlescent pigment and preparation method thereof
  • Magnetic pearlescent pigment and preparation method thereof

Examples

Experimental program
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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 C ( Fc 3 + ) / C ( Fc 2 + ) = 1.2 : 1 , 1.4:1, 1.6:1, 1.8:1 and 2.0:1, fix the other three factors, that is, the reaction temperature t=30°C, the NaOH concentration is 0.5mol / L, and the stirring speed is υ=13...

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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 takes a substrate with a particle diameter of 10-60mum as a cladding substrate, and the substrate is clad with Fe3O4. The preparation method of the magnetic pearlescent pigment comprises the following steps: dropwise adding ferric iron salt solution and ferrous iron salt solution to mica suspension at a certain temperature; controlling pH value for coprecipitation to deposit the precipitated ferroferric oxide evenly and compactly on the mica under the protection of inert gas; calcining in an inert atmosphere to prepare the magnetic pearlescent pigment. The prepared magnetic pearlescent pigment has a flat and compact deposition surface, high cladding rate and obvious pearlescent effect. The preparation method helps realize coprecipitation of the ferric iron and the ferrous iron and cause the ferroferric oxide to clad a sericite substrate evenly. The preparation method is suitable for the preparation of various pearlescent pigments, and a coprecipitation method and sintering atmosphere control are introduced to provide the possibility of depositing and cladding the oxides with different valences.

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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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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