Preparation method of full-wavelength ultraviolet shielding pearlescent pigment

Abstract

The invention discloses a preparation method of a full-wavelength ultraviolet shielding pearlescent pigment, and relates to the technical field of pearlescent pigments. The preparation method specifically comprises the following steps: S1, stirring and dissolving sodium hydroxide in water to obtain a sodium hydroxide solution and a pretreated base material, then adding reaction aid particles, stirring and dispersing, and heating to 50-65 DEG C to obtain a reaction base solution; s2, dropwise adding a TiCl4 aqueous solution into the reaction base solution, heating to 80 DEG C after dropwise adding, and carrying out heat preservation crystallization for 2 hours; and S3, then adding a ZnCl2 solution, then adding a Na2CO3 solution to adjust the pH value to be neutral, carrying out suction filtration after the reaction is completed, washing a filter cake with deionized water until no Cl <-> exists in the filtrate, drying and crushing the filter cake, removing reaction auxiliary agent particles, and calcining. The invention discloses a preparation method of a full-wavelength ultraviolet shielding pearlescent pigment, which is characterized in that reaction aid particles are added into a reaction solution, so that the pH value of the reaction solution can be adjusted, Cl <-> in the reaction solution can be removed, and the problem that a large amount of chlorine-containing wastewater is generated is avoided.

Description

technical field [0001] The invention relates to the technical field of pearlescent pigments, in particular to a preparation method of full-wavelength ultraviolet shielding pearlescent pigments. Background technique [0002] In recent years, with the gradual destruction of the ozone layer and the increase of ultraviolet radiation, the intensity of ultraviolet rays on the ground has continued to increase. Excessive exposure to ultraviolet rays will lead to redness, swelling, peeling and aging of the human body. In severe cases, it will cause skin cancer. Ultraviolet rays have strong penetrating ability , can cause skin tanning, aging and DNA damage, so research on anti-ultraviolet products has gradually become a hot field. [0003] Pearlescent pigments are named for their soft luster like pearls. The main preparation method is to uniformly coat a single layer or multiple layers of metal oxide on the surface of the substrate, so that the light can undergo multiple reflections a...

AI Technical Summary

Problems solved by technology

[0004] The existing pearlescent pigment production process is mainly the liquid phase deposition method, that is, in the aqueous solution state, the hydrolysis reaction of the metal salt is used to generate the corresponding metal oxide or hydroxide, and the hydrolyzed product is separated by Coulomb force and van der Waals force. Adsorbed on the surface of the substrate, the metal salts in it are mainly chloride salts, and the main by-product generated after hydrolysis of chloride salts is HCl, which will reduce the pH value of the reaction system and affect the progress of the reaction. Therefore, in the prior art The excess H is usually neutralized by adding an additional alkaline substance + , to achieve the effect of stabilizing the pH, but it is difficult to accurately control the dropping rate of the alkaline substance in the actual operation process, and it cannot affect the Cl in the reaction solution. - For removal, a large amount of Cl will be produced - waste water