阅读说明：本技术 一种多层滤光颜料 (Multilayer light filtering pigment ) 是由 任磊 于 2020-06-15 设计创作，主要内容包括：本发明提供一种多层滤光颜料,其为以下的片状多层结构：半反射层/第二介质层/半反射层/第一介质层/反射层/第一介质层/半反射层/第二介质层/半反射层。本发明在原有单次滤光结构的基础上构建差异二次滤光结构,从而获得更多的与现有产品差异化的产品；单次滤光形成主色调,差异二次滤光对主色调进行调色,把不需要的杂散光再次过滤；通过这样的结构可以获得更多更精准颜色的滤光材料。(The invention provides a multilayer light filtering pigment which is a flaky multilayer structure comprising the following components in parts by weight: semi-reflective layer/second dielectric layer/semi-reflective layer/first dielectric layer/semi-reflective layer/second dielectric layer/semi-reflective layer. The invention constructs a difference secondary filtering structure on the basis of the original single filtering structure, thereby obtaining more products differentiated from the existing products; the primary filtering forms a main tone, the difference secondary filtering colors the main tone, and filters the unnecessary stray light again; by the structure, more and more accurate color filtering materials can be obtained.)

1. A multilayer light filtering pigment characterized by: it is a sheet-like multilayer structure of:

semi-reflective layer/second dielectric layer/semi-reflective layer/first dielectric layer/semi-reflective layer/second dielectric layer/semi-reflective layer.

2. A multilayer filter pigment according to claim 1, wherein: the first dielectric layer and the second dielectric layer have different reference center wavelengths and different optical thicknesses.

3. A multilayer filter pigment according to claim 2, wherein: the first dielectric layer and the second dielectric layer are made of magnesium fluoride, silicon dioxide or cryolite.

4. A multilayer filter pigment according to any one of claims 1 to 3, wherein: the thickness of the first dielectric layer and the second dielectric layer is optical thickness QWOT, the value of the correspondingly selected reference wavelength lambda 0 is 300-800 nm, and the physical thickness is 100-5000 nm.

5. A multilayer filter pigment according to claim 4, wherein: the physical thickness and the optical thickness of the first dielectric layer and the second dielectric layer are close to but different from each other; or the optical thicknesses of the first dielectric layer and the second dielectric layer are different by multiple; or on the basis that the optical thicknesses of the first dielectric layer and the second dielectric layer are different in multiple, the physical thicknesses of the first dielectric layer and the second dielectric layer are close but different, so that the peak values of the reflectivity curves of the first dielectric layer and the second dielectric layer are close but not coincident.

6. A multilayer filter pigment according to claim 5, wherein: the physical thicknesses of the first dielectric layer and the second dielectric layer are close to but different from each other, and specifically include: the difference between the physical thicknesses of the first dielectric layer and the second dielectric layer is larger than 5 angstroms and smaller than 150 angstroms.

7. A multilayer filter pigment according to claim 1, wherein: the reflecting layer is made of aluminum or aluminum alloy.

8. A multilayer filter pigment according to claim 1, wherein: the semi-reflective layer is made of titanium, iron, silver or chromium.

9. A multilayer filter pigment comprising the multilayer filter pigment according to any one of claims 1 to 7, wherein an inducible reflective layer is added to the multilayer filter pigment, and wherein the inducible reflective layer is upgraded to an inducible multi-fold differential filter pigment: semi-reflective layer/second dielectric layer/semi-reflective layer/first dielectric layer/reflective layer/inducible reflective layer/first dielectric layer/semi-reflective layer/second dielectric layer/semi-reflective layer.

Technical Field

The invention relates to the technical field of light filtering pigments, in particular to a light filtering pigment sheet which is used for continuously changing color in a visible spectrum of products such as printing ink, paint and the like.

Background

Interference filters are known materials, and multilayer interference effect materials produced by the merck and basf processes by the liquid phase method are known as pearlescent pigments because of their surface having a layer of interference color resembling pearl luster.

The folex products company, in patent CN100475915C full dielectric optical variable pigments, discloses that a multilayer dichroic color-changing pigment is deposited on a flexible substrate in a gas phase manner, and the color-changing effect, color saturation and color sharpness of the multilayer dichroic color-changing pigment are more excellent than those of interference materials produced by a liquid phase method, but the product does not achieve the most excellent state effect because a 5-layer structure is adopted in the actual preparation process, and the folex products company continues to use integer multiples of QWPT as the structure basis.

Disclosure of Invention

In view of the background, it is desirable to provide a filter pigment with improved color shifting, color saturation and color sharpness.

The purpose of the invention is realized by the following technical scheme:

a multilayer light filtering pigment which is a platelet-shaped multilayer structure of:

semi-reflective layer/second dielectric layer/semi-reflective layer/first dielectric layer/semi-reflective layer/second dielectric layer/semi-reflective layer.

The principle of the invention is as follows: the differential secondary filtering method is to construct a secondary filtering system on the basis of 5 layers of filtering, namely primary filtering, which is described in the background art, and the filtering wave bands of the secondary filtering system and the primary filtering have corresponding differences. The 5-layer light filtering structure in the background art is as follows: the white light can be selected differently according to the thickness of the medium layer after the incident light passes through the normal filter cavity, and the white light is filtered into reflection curve product color separations with different colors; the differential secondary filtering system constructed by the invention performs differential secondary filtering on the basis of the original primary filtering. The first dielectric layer and the second dielectric layer select different reference center wavelengths, and the corresponding optical thickness and physical thickness are different; thereby obtaining a more specific reflection curve integration color. The optical thickness is expressed as: the first dielectric layer and the second dielectric layer select the same reference center wavelength, and the corresponding optical thickness and physical thickness are different at different N (multiple) values, thereby obtaining more special reflection integral color separation.

Preferably, the first dielectric layer may be magnesium fluoride (MgF)₂) Silicon dioxide (SiO)₂) Cryolite (Na)₂AlF₆) And the like. The free fluoride ion is forbidden under the regulation of a plurality of sanitary safety of European Union, and if the free fluoride ion is forbidden, the magnesium fluoride material can be abandoned, and other materials do not have negative influence on human bodies and environment. These types of materials may also be selected for the second dielectric layer, and the first dielectric layer and the second dielectric layer may be selected from the same or different materials.

Preferably, the thicknesses of the first dielectric layer and the second dielectric layer can use optical thickness QWOT, and the value of the correspondingly selected reference wavelength lambda 0 is 300-800 nm; the physical thickness is selected to be 100-5000 nm.

Preferably, the reflective layer is made of aluminum material or aluminum alloy material, and the final reflectivity of the filter material is higher and the color single color saturation is higher due to the effect of the aluminum material or aluminum alloy material as the reflective layer.

Preferably, the semi-reflecting layer material can be selected from a titanium material or a chromium material.

Preferably, the physical thickness and the optical thickness of the first dielectric layer and the second dielectric layer are close to but different from each other, namely, the near-peak difference filtering is performed; or the optical thicknesses of the first dielectric layer and the second dielectric layer are in multiple difference, namely optical multiple difference filtering; or on the basis that the optical thicknesses of the first dielectric layer and the second dielectric layer are different in multiple, the physical thicknesses of the first dielectric layer and the second dielectric layer are close but different, so that the peak values of the reflectivity curves of the first dielectric layer and the second dielectric layer are close but not coincident, namely the combination of two schemes of near-peak difference filtering and optical multiple difference filtering.

Specifically, the physical thicknesses of the first dielectric layer and the second dielectric layer are close to each other, which means that: the difference between the physical thicknesses of the first dielectric layer and the second dielectric layer is greater than or equal to 5 angstroms and less than or equal to 150 angstroms, namely: the physical thickness of the first dielectric layer-the physical thickness of the second dielectric layer is more than or equal to 150 angstroms and more than or equal to 5 angstroms.

Near peak difference filtering: the first dielectric layer and the second dielectric layer are relatively close to each other in terms of physical thickness or optical thickness, for example, the first dielectric layer is 2000 angstroms, the second dielectric layer is 2005 angstroms or the first dielectric layer is 2005 angstroms, and the second dielectric layer is 2000 angstroms, so that monochromaticity upgrading and fine adjustment of color hue are performed on the basis of filtering, integrating and color separation of a single normal wave cavity.

Optical power difference filtering: the optical thickness of the first dielectric layer and the second dielectric layer is selected by multiple difference, such as 2QWOT for the first dielectric layer and 4QWOT for the second dielectric layer, or 4QWOT for the first dielectric layer and 2QWOT for the second dielectric layer.

The combination of the two schemes of near-peak difference filtering and optical multiple difference filtering can obtain the filtering material with special color shade by using not only the optical multiple difference filtering but also the near-peak difference filtering in practical implementation.

In addition: the design of the multiple difference filtering pigment can also be realized by adding a magnetic layer, namely, an inducible reflecting conducting layer is added on the basis of the difference secondary filtering, and the design is upgraded to the design of the inducible multiple difference filtering pigment: semi-reflective layer/second dielectric layer/semi-reflective layer/first dielectric layer/reflective layer/inducible reflective layer/first dielectric layer/semi-reflective layer/second dielectric layer/semi-reflective layer.

Compared with the prior art, the invention has the following advantages:

constructing a difference secondary filtering structure on the basis of the original single filtering structure, thereby obtaining more products differentiated from the existing products; the primary filtering forms a main tone, the difference secondary filtering colors the main tone, and filters the unnecessary stray light again; by the structure, more and more accurate color filtering materials can be obtained.

In addition, three times of differential filtering or multiple times of differential filtering can be constructed in the same way, and a product with higher color precision is obtained;

the requirement of optical anti-counterfeiting is the comprehensive embodiment of product technology and product design, and the color required by background design can be better simulated by the scheme of differential secondary filtering, so that the consistency of the product color and the background design is more fit, for example, an integral color consistent with the dominant hue of the background is designed, and from the anti-counterfeiting angle, the color at an angle of 0 degree is consistent with the background color, so that the anti-counterfeiting product is not reproducible.

Drawings

FIG. 1 is a graph of the reflectance integrated color curve of a single-pass 5-layer structured filter pigment according to one embodiment of the present invention;

FIG. 2 is a reflection-integral color curve of a multilayer filter pigment with a differential secondary filter layer added on the basis of a single filtering in one embodiment of the present invention;

FIG. 3 is a chromaticity coordinate position of a single-pass filter 5-layer structure of filter pigments according to one embodiment of the present invention;

FIG. 4 is a chromaticity coordinate of a multilayer filter pigment with a differential secondary filter layer added on the basis of a single filtering in accordance with one embodiment of the present invention;

FIG. 5 is a plot of the integrated color of the single-pass 5-layer structure of filter pigments according to example two of the present invention;

fig. 6 is a reflection-integral color curve of a multilayer filter pigment with a differential secondary filter layer added on the basis of a single filtering in the second embodiment of the invention.

FIG. 7 is a chromaticity diagram coordinate location of a single filtered 5-layer structure filter pigment of a second example of the present invention;

fig. 8 is a chromaticity diagram coordinate position of the multilayer filter pigment after adding a differential secondary filter layer on the basis of the single filtering in the second embodiment of the invention.

Detailed Description