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Titanium dioxide for plastics and ink and preparation method thereof

A technology of titanium dioxide and ink, applied in the direction of ink, chemical instruments and methods, applications, etc., can solve the problems of reduced weather resistance, high production cost, and damage to the continuity of products, so as to improve weather resistance, gloss, lubricity and The effect of good fluidity and excellent dry powder fluidity

Active Publication Date: 2021-08-24
CHONGQING TITANIUM IND OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The photochemical activity of titanium dioxide pigment is the main factor affecting the weather resistance. Because titanium dioxide itself has some lattice defects, there are many photoactivation points on its surface, which have a slight absorption of visible light and ultraviolet spectrum. Under the long-term irradiation of ultraviolet light, if With the action of catalysts such as water, titanium dioxide can undergo continuous oxidation-reduction reactions to generate hydroxyl and peroxyl radicals. They are highly active and can oxidize organic polymers in products, resulting in polymer chain scission and degradation. , destroy the continuity of the product and reduce the weather resistance of the product
[0005] The silicon coating process has high temperature requirements. In order to achieve better weather resistance, the silicon coating temperature generally requires ≥80°C, and some even reach a slight boiling state. If the coating process is not well controlled, the slurry after coating should be filtered and washed with water. Difficult, the coating material has a false thickening phenomenon when washing, which has high requirements for production equipment, high production cost, and under high temperature conditions, the silicon reactivity is high, the reaction speed is difficult to control, and the density of the formed film layer is not uniform , the improvement of the weather resistance of titanium dioxide is not obvious
And silicon oxide is also known as white carbon black, and its refractive index is only about 1.5. Coating silicon oxide will reduce the gloss of titanium dioxide
[0006] Coating a layer of zirconia on the surface of titanium dioxide particles can improve the weather resistance and gloss of titanium dioxide, but as we all know, the cost of zirconium coating is high, and the hardness of zirconia is high, reaching about 7.5, which is used in the production process of plastic and ink products. In the process, the wear and tear on the production equipment is too large, thus increasing the production cost

Method used

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  • Titanium dioxide for plastics and ink and preparation method thereof
  • Titanium dioxide for plastics and ink and preparation method thereof
  • Titanium dioxide for plastics and ink and preparation method thereof

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preparation example Construction

[0028] Specifically, the preparation method of titanium dioxide for plastics and printing inks comprises the following steps:

[0029] S1. Pretreatment: Add sodium silicate solution into water, then add rutile titanium dioxide to beat and disperse to obtain a titanium dioxide slurry with a concentration of 300-800g / L; grind and classify the titanium dioxide slurry to obtain a titanium dioxide particle size D50 of 0.25- 0.45μm, D90≤0.8μm titanium dioxide slurry;

[0030] S2. Inorganic coating:

[0031] ①Coating zinc oxide: control the temperature of the titanium dioxide slurry obtained in step S1 to 55-75°C, and add zinc salt solution and alkali solution at a constant speed for 60-180 minutes to maintain the pH of the slurry at 8.0-10.0, and react for 60-120 minutes; The temperature of the slurry system in the zinc oxide coating process is maintained at 55-75°C; the amount of the zinc salt solution added is calculated as the TiO in the slurry in terms of ZnO 2 0.5~1.5% of mas...

Embodiment 1

[0044] Add prepared sodium silicate dispersant to deionized water, then add rutile titanium dioxide particles, perform beating and dispersion treatment, and obtain titanium dioxide slurry with a concentration of 600g / L. The titanium dioxide slurry was subjected to wet grinding, and the ground slurry was classified to obtain the classified slurry: the particle size D50 of the titanium dioxide particles in the slurry was 0.35 μm, and the D90 was 0.75 μm. Put the slurry into the coating equipment with stirring device, start the stirring device, heat and maintain the temperature of the slurry at 60°C; add zinc chloride with a concentration of 100g / L to the slurry at a constant speed and co-current within 100 minutes Solution and a sodium hydroxide solution with a mass fraction of 15%, maintain the pH value of the slurry at 8.0 to 10.0, and the amount of zinc chloride solution added is calculated as ZnO in the slurry TiO 2 1.0% of the mass, react for 100 minutes; add a sodium metaa...

Embodiment 2

[0046] Add prepared sodium silicate dispersant to deionized water, then add rutile titanium dioxide particles, perform beating and dispersion treatment, and obtain titanium dioxide slurry with a concentration of 600g / L. The titanium dioxide slurry was subjected to wet grinding, and the ground slurry was classified to obtain the classified slurry: the particle size D50 of the titanium dioxide particles in the slurry was 0.35 μm, and the D90 was 0.75 μm. Put the slurry into the coating equipment with stirring device, start the stirring device, heat and maintain the temperature of the slurry at 60°C; add zinc chloride with a concentration of 150g / L to the slurry at a uniform speed and co-current within 60 minutes Solution and a sodium hydroxide solution with a mass fraction of 15%, maintain the pH value of the slurry at 8.0 to 10.0, and the amount of zinc chloride solution added is calculated as ZnO in the slurry TiO 2 0.5% of the mass, react for 60 minutes; add a sodium metaalum...

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Abstract

The invention belongs to the field of chemical industry, and in particular relates to a titanium dioxide used for plastics and inks and a preparation method thereof, comprising the following steps: performing beating, grinding and grading pretreatment on rutile titanium dioxide, and then carrying out inorganic coating with zinc oxide and aluminum oxide, Reprocessing and finally organic coating to obtain the product. The titanium dioxide for plastics and inks prepared by the method of the invention has good weather resistance and glossiness, and can well satisfy subsequent use.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to titanium dioxide for plastics and inks and a preparation method thereof. Background technique [0002] Titanium dioxide (commonly known as titanium dioxide) is currently the best white pigment in the world. It not only has very stable physical and chemical properties, but also has excellent optical and electrical properties such as high refractive index, best hiding power, best whiteness and brightness, and is widely used. Used in coatings, plastics, papermaking, ink, electronics and other fields, it is called "industrial monosodium glutamate". [0003] Weather resistance refers to the ability of products containing titanium dioxide pigments to resist the effects of sunlight and the atmosphere when exposed to outdoor climates, and to avoid discoloration, chalking, and loss of gloss. The photochemical activity of titanium dioxide pigment is the main factor affecting the weather r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/36C09C3/10C09C3/06C08L23/12C08L27/06C08K9/10C08K3/22
CPCC08K3/22C08K9/10C08K2003/2241C09C1/3653C09C1/3676C09C1/3692C09C3/06C09C3/10C09D11/03C09D11/38C08L23/12C08L27/06
Inventor 肖勇丽淦文军赵北东李开娟和柳
Owner CHONGQING TITANIUM IND OF PANGANG GROUP
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