Pigment of multi-gradition discolour at diffierent direction and production process thereof

Abstract

The invention provides a multilayer disclour pigment with different colors according to different viewing angle and its producing method, using synthetic thin glass plate as a substrate, alternatively coating the surface of the thin glass plate with at least three metal oxide layers with refractivity greater than 1.8 and less than 1.8, where the metal oxide layer with refractivity less than 1.8 is always between the other two ones with refractivity greater than 1.8. The invention uses chemical hydrolyzation process to alternatively coat high- and low- refractivity oxide layers on the surface of the thin glass plate. It has low price, wide color change range, and simple manufacture process.

Description

technical field [0001] The invention relates to a color-changing pigment, in particular to a color-changing pigment showing different interference colors with different viewing angles; the invention also relates to a production method of the color-changing pigment. Background technique [0002] Multi-layer color-changing pigments will show color changes between two or more strong interference colors with different viewing angles. At present, most of the angle-dependent pigments are coated with metal oxides and non-metal oxides on the surface of the substrate by gas phase method, plasma splashing or wet chemical method to form a multi-layer structure. Due to the difference of the substrate, the production method of the pigment It is also different, but there are problems such as complicated process, high price, and small range of color changes. [0003] 1. The multi-layer color-changing pigment with opaque metal foil or metal oxide as the substrate adopts the method of vacuu...

AI Technical Summary

Problems solved by technology

This process has the problem of difficulty in effectively dispersing the substrate in the reactor, and it is also difficult to control the addition of metering. In addition, the use of organometallic compounds also has environmental problems.

The manufacturing process of this pigment is complicated, the equipment requirements are high, the substrate preparation cost is high, and the process control precision is high, so the product also has the problem of high price and limited wide use

[0005] 3. The color-changing pigment with artificially synthesized silica as the substrate (the substrate is prepared by coating a certain concentration of water glass on a special equipment, and drying and peeling), through a wet chemical process, hydrolysis Soluble inorganic metal compounds and soluble non-metallic compounds generate hydrated metal oxides, which are deposited on the substrate, and can be alternately coated with low-refractive-index metal oxides and high-refractive-index metal oxides on the substrate. Because it is a wet chemical method, it is easy to operate and control the optical thickness of the required cladding layer, the process is simple, and it is easy to produce on a large scale. It can also be coated with a layer of high refractive index metal oxide on the surface of the silica substrate The effect of color flop is obtained, but because the required thickness of the substrate is less than 1 micron, generally in the range of 200-500nm, this brings great difficulties to the preparation of the substrate, the cost of preparing the substrate is high, and the output is low. Low, so the pigment also has the problems of high cost and not widely used

It can be seen that its color change range is very small, and it still belongs to the category of ordinary color-changing pigments, and the problem of different colors with angles has not been solved.