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Optical interference pigments are produced by a series of pigmentation processes such as crushing, grading, and surface treatment of optical films with interference structures. It successfully used the properties of optical films to produce a variety of dynamic interference colors. This unique flake pigment maintains all optical properties of the optical film. As long as the angle of observation and the angle of incidence of the light are different, each piece of pigment will reflect a colorful change of color toward the mirror surface. The accurate use of optical interference technology allows precise control of color changes.
The optical film is formed according to the requirements of the film structure, and the materials with different refractive indexes are alternately deposited on the same carrier under high vacuum conditions. The material is evaporated into the carrier in the form of molecules or atoms. In order to ensure the uniformity and compactness of the film, the consistency of the evaporation rate must be strictly controlled; and in order to control the color index of the film system, the thickness of the film must be changed. It is controlled in the range of Angstroms (1 Angstrom = 10-1 nm = 10-7 mm). This shows the precision and specificity of optical film production.
Membrane design to meet the spectral requirements of the premise, the number of membrane layers should be as small as possible to reduce production costs. At present, the ideal light interference pigment film is a 5-layer symmetric structure as shown in FIG. 2 , with a film thickness of about 1 μm, and an opaque reflection layer in the middle (which can be regarded as a common base for two upper and lower interference chambers). It is a symmetrical transparent colorless dielectric layer and a translucent metal layer, so that both the upper and lower sides of the diaphragm have the same interference color. By changing the thickness of the transparent dielectric layer, the color of the film system can be changed to obtain various colors of light interference pigments. Since the film is made under a high vacuum, all the materials used are colorless or transparent inorganic materials, and the generated light interference pigments have stable performance, dense structure, no fading, strong weather resistance, and good shear resistance. The requirements for the particle size of the ink are arbitrary.
At present, there are interference pigments prepared by chemically coating natural mica sheets and metal aluminum sheets as substrates, and interference pigments produced by utilizing the characteristics of the liquid crystal sheets. However, neither color nor physical properties can compare with light interference pigments. They are mainly used in the coatings industry and are difficult to meet the demanding requirements of printing inks for flake pigments.
The dynamic color-changing effects of printed products of light-variable inks cannot be duplicated with high-definition scanners, color copiers, and other equipment; in addition, its design and production technologies are highly specialized; the production process is complicated; the investment is huge; and it is difficult to imitate. It is used by more than 70 countries in the world for currency security. Since the use of 100 RMB in the 99 edition, the security mark has not been copied on counterfeit money, and it has become an important publicity mark for newspapers and magazines to identify serious fake RMB. In addition can also be widely used in various types of securities, famous trademarks, documents and documents, product packaging and other printed materials security.
At present, only the United States can produce thin-film light interference pigments, and there are only a handful of companies that use U.S. pigments to produce optically variable inks. Domestic Huizhou City Sunlight Science and Technology Co., Ltd. has successfully developed and mass-produced light interference pigments and optical variable inks in batches. The products have international advanced level. Has been used in a number of famous cigarette packaging and important documents of security printing.
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2 We can design the membrane system according to the need, reasonably calculate the material and film thickness of the optional film, and change the N and d values ​​to achieve the predetermined reflectance spectrum and optical performance index. Realize the desire of people to control and select the reflective spectrum and optical properties of the object surface.