Colorful composite film
By designing a colorful composite film including multiple colorful layers, the problems of complex process, high cost and insufficient performance of traditional colorful materials are solved, and a higher reflectivity and a wider reflection spectrum are achieved, which significantly improves the colorful effect.
Patent Information
- Application Number
- CN202420552374.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-20
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-03-20
AI Technical Summary
Traditional colorful materials have complex processes, high equipment costs, low production efficiency, and low mechanical strength of the prepared coating, poor adhesion, insufficient reflectivity and reflection spectrum width, which limits practical applications.
A colorful composite film is designed, including a first substrate layer, a first color layer, a second color layer and a second substrate layer stacked in sequence, and the reflection spectrum peaks and troughs of the first color layer and the second color layer overlap to enhance the overall reflectivity and reflection spectrum width.
The reflectivity and reflection spectrum width of the colorful composite film are improved, the reflection effect is significantly enhanced, the problem of insufficient mechanical strength and adhesion is solved, and the production cost is reduced.
Smart Images
Figure CN222561805U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of composite films, and in particular relates to a colorful composite film. Background Art
[0002] Colorful materials refer to materials that show different colors as the viewing angle changes. Traditional colorful materials use the principle of light interference produced by multi-layer structures composed of different refractive indices, that is, as the viewing angle of the human eye changes, the material can produce a rainbow-colored effect. This technology has a significant colorful effect, but the process is complex, the equipment cost is high, and the production efficiency is low; at the same time, magnetron sputtering technology can also construct a multi-layer structure composed of different refractive indices, so that the material can achieve the same colorful effect, but the process is also complex, the equipment and raw materials are expensive, and the production efficiency is low.
[0003] In recent years, people have developed new colorful materials using the optical rotation, selectivity, light scattering, circular polarization dichroism and other characteristics of cholesteric liquid crystals. When the wavelength of the incident light matches the pitch of the cholesteric liquid crystal, the light is reflected, and the reflected light is circularly polarized light. The rotation direction of the circularly polarized light is consistent with the spiral structure of the cholesteric liquid crystal. Therefore, by changing the refractive index and pitch of the liquid crystal, the wavelength of its reflected light can be adjusted to achieve a colorful effect. Cholesteric liquid crystals are usually prepared from nematic liquid crystal materials and chiral agents, and the chiral additives can induce the nematic phase to transform into a cholesteric phase. This method is efficient and fast, with simple preparation equipment and low cost. However, the disadvantage is that the coating prepared by this method has low mechanical strength, poor adhesion, and the reflectivity and width of the reflection spectrum of the coating are insufficient, which greatly limits practical applications. Usually, there are compatibility issues between colorful coatings of different bands, so coatings of different bands cannot be directly mixed to achieve the purpose of increasing the spectral width. Utility Model Content
[0004] In order to solve all or part of the above technical problems, the utility model provides the following technical solutions:
[0005] The utility model provides a colorful composite film, which comprises a first substrate layer, a first colorful layer, a second colorful layer and a second substrate layer which are stacked in sequence, and a wavelength band where a peak in a reflected light spectrum of the first colorful layer and a wavelength band where a trough in a reflected light spectrum of the second colorful layer at least partially overlap.
[0006] The colorful paint of the utility model material can be any colorful paint in the prior art. When selecting the paint, it is selected based on the reflection spectrum characteristics of the above-mentioned paint. The purpose of such selection is to improve the overall reflectivity and reflection spectrum width of the colorful composite film, thereby making the reflection effect more obvious.
[0007] In some embodiments, the colorful composite film also includes an optical microcavity layer, which includes a plurality of reflective structures arranged in an array. The optical microcavity layer is disposed between the second colorful layer and the second substrate layer, and is at least used to enhance the colorful effects of the first colorful layer and the second colorful layer.
[0008] In some embodiments, the colorful composite film further comprises an ultraviolet absorption layer, which is disposed between the first substrate layer and the first colorful layer. The ultraviolet absorption layer is used to at least absorb ultraviolet light, reduce the risk of film aging, and increase the service life of the film.
[0009] The colorful composite film further comprises a heat absorption layer, which is arranged between the optical microcavity layer and the second substrate layer. The heat absorption layer is at least used for absorbing heat.
[0010] In some embodiments, the colorful composite film further includes an adhesive layer, which is used to bond the first substrate layer, the ultraviolet absorption layer, the first colorful layer, the second colorful layer, the optical microcavity layer, the heat absorption layer and the second substrate layer.
[0011] In some embodiments, the thickness of the first colorful layer and the second colorful layer is 2-3 um. The thickness of the first colorful layer and the second colorful layer can be the same or different.
[0012] In some embodiments, the thickness of the first substrate layer and the second substrate layer is 25-50 um.
[0013] In some embodiments, the first substrate layer and the second substrate layer are PET layers, PE layers, PP layers, PI layers or PC layers.
[0014] In some embodiments, the thickness of the bonding layer is 1-2 um.
[0015] In some embodiments, the adhesive layer is made of UV curing glue or heat curing glue.
[0016] In some embodiments, the optical microcavity layer has a thickness of 10-20 um.
[0017] In some embodiments, the thickness of the ultraviolet absorption layer is 5-10 um, and the thickness of the heat absorption layer is 5-10 um.
[0018] The colorful composite film provided by the utility model can be obtained by the following method:
[0019] Take a first PET film, apply a first colorful coating on the first PET film using a wire rod, and then dry and cure using UV;
[0020] Take a second PET film, use a wire rod to scrape the second colorful paint on the second PET film, dry it and then UV cure it; wherein the peak of the central wave band of the first colorful paint coincides with the trough of the second colorful paint, and the peak of the central wave band of the second colorful paint coincides with the trough of the first colorful paint;
[0021] The first PET film and the second PET film are arranged with the sides coated with colorful coatings facing each other, and are bonded with UV adhesive and then cured to obtain a colorful composite film.
[0022] Compared with the prior art, the utility model has at least the following beneficial effects:
[0023] In the colorful composite film provided by the utility model, the colorful layer is located between the first substrate layer and the second substrate layer, thereby avoiding the problem of the colorful coating layer being directly in contact with the outside world and being damaged by friction, and at the same time solving the problem of low mechanical strength and poor adhesion caused by the colorful layer being located on the surface layer in the prior art;
[0024] In the colorful composite film provided by the utility model, two colorful layers with different central bands are arranged, so that the colorful composite film as a whole has a stronger reflectivity and a reflection spectrum width, thereby making the overall reflection effect of the composite film more obvious.
[0025] In the colorful composite film provided by the utility model, the ultraviolet absorption layer is located between the first substrate layer and the first colorful layer, which effectively reduces the aging effect of ultraviolet rays on organic matter and enhances the service life of the composite film;
[0026] In the colorful composite film provided by the utility model, the optical microcavity layer is located between the second substrate layer and the second colorful layer, and the optical microcavity layer includes a plurality of reflective structures arranged in an array, which can enhance the colorful effects of the first colorful layer and the second colorful layer;
[0027] In the colorful composite film provided by the utility model, the colorful composite film also includes a heat absorption layer, and the heat absorption layer is arranged between the optical microcavity layer and the second substrate layer, and can effectively absorb the heat generated by the optical radiation. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0029] Figure 1 This is a schematic diagram of the structure of the colorful composite film in one embodiment of the utility model;
[0030] 1-first substrate layer, 2-adhesive layer, 3-first colorful layer, 4-adhesive layer, 5-second colorful layer, 6-adhesive layer, 7-second substrate layer;
[0031] Figure 2 It is the reflection spectrum of the first colorful layer, the second colorful layer, and the colorful composite film as a whole. DETAILED DESCRIPTION
[0032] The technical solution of the present invention is described in detail below in conjunction with specific embodiments so that those skilled in the art can better understand and implement the technical solution of the present invention. The specific functional details disclosed herein should not be interpreted as being restrictive, but only as the basis for the claims and as a representative basis for teaching those skilled in the art to adopt the present invention in different ways in any appropriate detailed embodiment.
[0033] Example 1
[0034] like Figure 1 As shown, this embodiment provides a colorful composite film, including a first substrate layer 1, an adhesive layer 2, a first colorful layer 3, an adhesive layer 4, a second colorful layer 5, an adhesive layer 6 and a second substrate layer 7 arranged in sequence, wherein the first colorful layer 3 and the second colorful layer 5 use different colorful coatings. The utility model arranges the first colorful layer 3 and the second colorful layer 5 between the first substrate layer 1 and the second substrate layer 7, which can avoid the problem of coating damage caused by direct contact and friction between the colorful layer and the outside world, and solves the problem of low mechanical strength and poor adhesion caused by the colorful layer being located on the surface in the prior art.
[0035] The first colorful layer 3 and the second colorful layer 5 of the utility model are made of different colorful paints. Specifically, two colorful paints with different peak positions of reflection spectra and partially overlapping reflection spectra are selected to form the first colorful layer 3 and the second colorful layer 5 respectively.
[0036] like Figure 2As shown, in one embodiment of the present invention, the peak of the reflection spectrum of the first colorful layer 3 is 600nm, the spectrum width is 100nm, and the reflectivity is 42%; the peak of the second colorful layer 5 is 645nm, the spectrum width is 100nm, and the reflectivity is 44.7%. That is, the peak position of the central band of the reflection spectrum of the first colorful layer 3 coincides with the trough position of the central band of the reflection spectrum of the second colorful layer 5, and the peak position of the central band of the reflection spectrum of the second colorful layer 5 coincides with a trough position of the central band of the reflection spectrum of the first colorful layer 3, and the central band of the reflection spectrum of the whole colorful composite film obtained thereby has a peak at 625nm, a spectrum width of 150nm, and a reflectivity of 54.9%. The technical solution provided by the present invention can simply solve the problems of low reflectivity and narrow reflection spectrum width of the colorful film in the prior art, making the reflection effect of the composite film more obvious; it also solves the problem of poor direct mixing effect caused by the incompatibility of two different colorful coatings.
[0037] The colorful layer in the utility model can be formed by any colorful coating known in the prior art, and the selection can be made according to the combination of the above-mentioned required reflection spectrum characteristics.
[0038] In the embodiment 1 of the present invention, the first substrate layer 1 and the second substrate layer 7 are made of PET film, which has good mechanical properties, transparency and chemical resistance. Of course, in other embodiments, the first substrate layer and the second substrate layer can also be made of other materials, such as PE layer, PP layer, PI layer or PC layer.
[0039] In the first embodiment of the present invention, the adhesive layers 2, 4, and 6 are made of light-curing adhesive, which can be cured quickly and has high bonding strength, good weather resistance, and optical properties. Of course, in other embodiments, the adhesive layers 2, 4, and 6 may also be made of other types of adhesive, such as heat-curing adhesive, as long as they have at least a bonding effect.
[0040] In Example 1 of the present invention, the thickness of the first substrate layer and the second substrate layer is, for example, 25-50um; the thickness of the adhesive layer is, for example, 1-2um; the thickness of the first colorful layer and the second colorful layer is, for example, 2-3um. When the thickness of the first colorful layer and the second colorful layer is within this range, an effective colorful effect can be produced. If the thickness is too low, the colorful effect will not be obvious. If it is too thick, the colorful effect gain effect relative to the 2-3um colorful layer is not significant.
[0041] The composite colorful film of this embodiment can be prepared by the following method:
[0042] A PET film with a film thickness of 500 μm was taken as the first substrate layer 1, and a wire rod was used to scrape the first colorful paint (coating thickness was 10 μm) on the PET film. The solid content of the first colorful paint was 25%, and UV glue was used as the adhesive. After the scraping was completed, it was dried at a temperature of 75°C for 1 minute, and then 500 mj / cm 2 The first colorful layer 3 is obtained by curing with a mercury lamp with energy. The peak position of the reflection spectrum of the first colorful layer 3 is measured to be 600nm, the width of the reflection spectrum is 100nm, and the reflectivity is 44.7%; another PET film with a thickness of 500um is taken as the second substrate layer 7, and a wire rod is used to scrape the second colorful paint on the PET film (the coating thickness is 10um). The solid content of the second colorful paint is 25%, and UV glue is used as the adhesive. After the scraping is completed, it is first dried at a temperature of 75°C for 1min, and then heated at 500mj / cm 2 The second colorful layer 5 is obtained by curing with a mercury lamp with an energy of 500mj / cm2. The peak position of the reflection spectrum of the first colorful layer 5 is measured to be 645nm, the reflection spectrum width is 100nm, and the reflectivity is 42%. Two PET films with one side composited with the colorful layer are arranged facing each other, extruded and bonded using UV glue, and cured with a mercury lamp with an energy of 500mj / cm2 to obtain a colorful composite film. The peak of the reflection spectrum of the colorful composite film is 625nm, the spectrum width is 150nm, and the reflectivity is 54.9%.
[0043] Example 2
[0044] The present embodiment provides a colorful composite film, comprising a first substrate layer, an ultraviolet absorption layer 3, a first colorful layer 4, a second colorful layer 6, an optical microcavity layer 8, and a second substrate layer 10 arranged in sequence, wherein the first colorful layer 3 and the second colorful layer 4 use different colorful coatings.
[0045] In Example 2 of the utility model, the ultraviolet absorption layer is located between the first substrate layer and the first colorful layer. The ultraviolet absorption layer has the function of absorbing ultraviolet rays, which can effectively reduce the aging effect of ultraviolet rays on organic matter and improve the aging resistance of the composite film. The ultraviolet absorption layer can be made of any ultraviolet absorption material in the prior art, such as nano titanium dioxide, nano zinc selenide, salicylic acid esters, benzophenone ultraviolet absorbers, benzotriazole ultraviolet absorbers, substituted acrylonitrile ultraviolet absorbers, triazine ultraviolet absorbers, etc.
[0046] The optical microcavity layer is located between the second substrate layer and the second colorful layer, and is composed of a plurality of reflective structural units arranged in an array, and has the function of enhancing the colorful effect. The optical microcavity layer can be any optical microcavity material in the prior art, such as magnesium fluoride, calcium fluoride, barium fluoride, lithium niobate, lithium tantalate, sapphire and other crystal materials.
[0047] The heat absorption layer is located between the optical microcavity layer and the second substrate layer, and has the function of absorbing infrared rays, thereby achieving the effect of reducing heat transmission. The heat absorption layer can be made of any heat absorption material in the prior art, such as indium tin oxide composite materials, antimony tin oxide, cesium-doped tungsten bronze, lanthanum hexaboride and other nanomaterials with heat absorption function and their composites.
[0048] The various aspects, embodiments, features and examples of the present invention should be considered as illustrative in all aspects and are not intended to limit the present invention, the scope of which is defined solely by the claims. Other embodiments, modifications and uses will be apparent to those skilled in the art without departing from the spirit and scope of the present invention as claimed.
[0049] In addition, the inventor of the present invention also conducted experiments with other raw materials, process operations, and process conditions described in this specification with reference to the aforementioned embodiments, and obtained relatively ideal results.
[0050] Although the utility model has been described with reference to illustrative embodiments, it will be understood by those skilled in the art that various other changes, omissions and / or additions may be made without departing from the spirit and scope of the utility model, and the elements of the embodiments may be replaced by substantial equivalents. In addition, many modifications may be made without departing from the scope of the utility model to adapt specific situations or materials to the teachings of the utility model. Therefore, it is not intended herein to limit the utility model to the disclosed specific embodiments for performing the utility model, but it is intended that the utility model will include all embodiments within the scope of the appended claims. In addition, unless specifically stated, any use of the terms first, second, etc. does not indicate any order or importance, but uses the terms first, second, etc. to distinguish one element from another element.
Claims
1. A colorful composite film, characterized in that: The colorful composite film includes a first substrate layer, a first colorful layer, a second colorful layer and a second substrate layer stacked in sequence, and the peak band of the reflected light spectrum of the first colorful layer and the trough band of the reflected light spectrum of the second colorful layer at least partially overlap.
2. The colorful composite film according to claim 1, characterized in that: The colorful composite film also includes an optical microcavity layer, which includes a plurality of reflective structures arranged in an array. The optical microcavity layer is disposed between the second colorful layer and the second substrate layer, and is at least used to enhance the colorful effects of the first colorful layer and the second colorful layer.
3. The colorful composite film according to claim 2, characterized in that: The colorful composite film further comprises an ultraviolet absorption layer, and the ultraviolet absorption layer is arranged between the first substrate layer and the first colorful layer.
4. The colorful composite film according to claim 3, characterized in that: The colorful composite film further comprises a heat absorption layer, and the heat absorption layer is arranged between the optical microcavity layer and the second substrate layer.
5. The colorful composite film according to claim 4, characterized in that: The colorful composite film further comprises an adhesive layer, which is used to bond the first substrate layer, the ultraviolet absorption layer, the first colorful layer, the second colorful layer, the optical microcavity layer, the heat absorption layer and the second substrate layer.
6. The colorful composite film according to claim 1, characterized in that: The thickness of the first colorful layer and the second colorful layer is 2-3um.
7. The colorful composite film according to claim 1, characterized in that: The thickness of the first substrate layer and the second substrate layer is 25-50 um.
8. The colorful composite film according to claim 1, characterized in that: The first substrate layer and the second substrate layer are PET layers, PE layers, PP layers, PI layers or PC layers.
9. The colorful composite film according to claim 5, characterized in that: The thickness of the bonding layer is 1-2 um.
10. The colorful composite film according to claim 5, characterized in that: The bonding layer uses UV curing glue or heat curing glue.
11. The colorful composite film according to claim 2, characterized in that: The optical microcavity layer has a thickness of 10 to 20 um.
12. The colorful composite film according to claim 4, characterized in that: The thickness of the ultraviolet absorption layer is 5-10um, and the thickness of the heat absorption layer is 5-10um.