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Optical pigment and its preparation method

A pigment and optical technology, which is applied in the field of optical pigments and its preparation, can solve the problems of reduced interference color saturation, weak pigment light interference, and increased scattering rate, and achieve the effects of reduced dosage, good hiding power, and reduced thickness

Active Publication Date: 2014-07-09
SHANTOU LONGHUA PEARL LUSTRE PIGMENTS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The main purpose of the present invention is to overcome the defects of existing pearlescent pigments and provide a new optical pigment. Ratio increases, so that the light interference of the pigment becomes weaker, and the saturation of the interference color decreases, so that the present invention is more suitable for practical use, and has industrial utilization value

Method used

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  • Optical pigment and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] This example illustrates how the optical pigments of the present invention are prepared.

[0069] Put a certain amount of substrate into the reaction kettle, add an appropriate amount of pure water, stir and heat up to 70-80°C, adjust the kettle liquid to a certain pH value with acid or alkali, and then add it in at a certain rate A certain concentration of high refractive index metal salt solution (such as titanium tetrachloride or ferric chloride), while adding lye dropwise to maintain the pH value of the kettle liquid, when coating a certain interference color, stop feeding; then slowly add The lye raises the pH value of the still liquid to 8-9, then metering in a certain concentration of water glass solution at a certain rate, and at the same time metering in a metal salt (a soluble metal that can generate high refractive index oxides) at a certain rate Salt) aqueous solution, the feeding rate can be changed according to the needs, and then add dilute hydrochloric a...

Embodiment 2

[0075] This example further illustrates how the optical pigment of the present invention is prepared.

[0076] Put a certain amount of substrate into the reaction kettle, add an appropriate amount of pure water, stir and heat up to 70-80°C, adjust the pH value of the kettle liquid to 8-9 with lye, and then slowly drop in at a certain rate A certain amount of water glass solution is added dropwise to maintain the pH value of the kettle liquid at the same time. After adding, adjust the kettle liquid to a certain pH value with the acid solution, and then add a high Refractive index metal salt solution (such as titanium tetrachloride or ferric chloride), while adding lye dropwise to maintain the pH value of the kettle liquid, when coating a certain interference color, stop feeding; then slowly add lye to raise the kettle The pH value of the solution reaches 8-9, and then metered in a certain concentration of water glass solution at a certain rate, and at the same time metered in a...

Embodiment 3

[0085] Take 100 grams of synthetic mica powder with a particle size of 10-60 microns as the substrate, and put it into a 2000 ml reaction kettle, stir and raise the temperature to 75°C, adjust the pH value of the kettle liquid to 3.2 with hydrochloric acid (30%), and then Add dropwise ferric chloride solution (100g (FeCl 3 ) / L), while adding sodium hydroxide solution (NaOH, 15%) dropwise to maintain a constant pH until the interference color of the substrate is light yellow, and then adjust the pH of the kettle liquid with sodium hydroxide solution (NaOH, 15%) to 9, then drip water glass solution (30g (SiO 2 ) / L), while adding dropwise titanium tetrachloride solution (200g(TiCl 4) / L), the dropping rate makes the ratio of silicon dioxide to titanium dioxide 100:12, and at the same time, drop hydrochloric acid solution (30%) to keep the pH of the kettle liquid constant until the substrate reaches the interference color green, and then use hydrochloric acid solution (30%) the p...

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Abstract

The invention relates to an optical pigment comprising a substrate and a coating layer coating the substrate. The substrate is at least successively coated with three coating matters. The three coating matters are successively selected from titanium dioxide, stannic oxide, ferric oxide, ferroferric oxide, cobaltous oxide, cobalt sesquioxide, zirconium dioxide, chromic oxide or a mixture and a compound thereof; silicon dioxide; and aluminum oxide, bismuth trioxide or a mixture or compound thereof. The optical pigment provided by the invention overcomes the defects of small particle diameter reflecting surface and low color saturation due to small pigment particles in the prior art. At the same time, the invention also relates to a preparation method of the optical pigment, the preparation method overcomes the defects of ''layer lamination '' of the coating layer in the prior art, meanwhile the coating amount of the coating layer is reduced, and the number of particles per unit weight is increased, so that color of the prepared pigment is more full, rich and varied.

Description

technical field [0001] The invention relates to a product used in the fields of ceramics, cosmetics, coatings, printing, plastics, special paper, chemical industry, etc., in particular to an optical pigment used in the above fields. Furthermore, the present invention also relates to a preparation method of the above-mentioned optical pigment. Background technique [0002] The characteristic of the interference color pearlescent pigment is that one or more metal oxides are coated on the surface of a sheet-shaped substrate once or more times, through the multiple refraction, reflection and transmission of visible light on the interface between the metal oxide and the substrate, By adjusting the geometric thickness or optical thickness of the coated metal oxide, light interference is formed on the surface of the pigment particles, so that the pigment particles have interference colors and color the products. This color gives a sense of depth, giving it a pearl-like sheen. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/40C09C1/00C09C1/24C09C3/06
Inventor 付建生张军礼刘越刘挺
Owner SHANTOU LONGHUA PEARL LUSTRE PIGMENTS CO LTD
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