A dimming and haze-adjusting film and preparation method thereof

Abstract

The present invention belongs to the technical field of functional films, and discloses a dimming and haze-adjusting film and a preparation method thereof. The dimming and haze-adjusting film comprises, from top to bottom, a first substrate layer, a first transparent conductive layer, a dimming and haze-adjusting layer, a second transparent conductive layer, and a second substrate layer. The raw material components for preparing the dimming and haze-adjusting layer include: a dichroic dye, a nematic liquid crystal, and a photocurable adhesive. The present invention optimizes the structure of the dimming and haze-adjusting film, selects the raw material components of the dimming and haze-adjusting layer, and especially controls the ratio of azo dyes and anthraquinone dyes in the dichroic dyes and the components of the photocurable adhesive, so that the prepared dimming and haze-adjusting film has good visible light transmittance, haze and contrast when the power is on and off, and has excellent weather resistance. The dimming and haze-adjusting film adopts UV curing, has high production efficiency, can avoid the negative effects of UV light during the curing process, and is conducive to production.

Description

Technical Field

[0001] The invention belongs to the technical field of functional films, and in particular relates to a dimming and haze-adjusting film and a preparation method thereof. Background Art

[0002] The dimming and haze-adjusting film belongs to the PDLC (polymer dispersed liquid crystal) technical solution. It is necessary to add dichroic dyes to the PDLC material to achieve both dimming and haze adjustment. At present, some monochrome azo dichroic dyes have poor weather resistance, and the contrast of anthraquinone dichroic dyes is relatively poor compared to azo. Therefore, in order to meet the customer's contrast and weather resistance requirements, azo and anthraquinone are usually mixed. The dimming and haze-adjusting film is mainly used in car skylights, and the application conditions are relatively harsh. Even if azo and anthraquinone are mixed, the weather resistance still does not meet the customer's requirements. The main reason is that the dye itself is particularly afraid of UV, and conventional dimming and haze-adjusting films will be exposed to UV during the production process, which will have a certain negative impact on the dye during the curing process. If UV curing is not used, the production efficiency is relatively low. Therefore, it is urgent to develop a dimming and haze-adjusting film that is conducive to production and has excellent weather resistance and contrast. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the above-mentioned prior art. To this end, the present invention provides a dimming and haze-adjusting film and a preparation method thereof. The dimming and haze-adjusting film provided by the present invention is not only easy to produce but also has excellent weather resistance and contrast.

[0004] The invention provides a light-adjusting and haze-adjusting layer.

[0005] Specifically, a dimming and haze-adjusting layer includes the following raw material components by weight percentage: 1.0%-5.0% of a dichroic dye, 36.0%-59.0% of a nematic phase liquid crystal, and 38.0%-62.0% of a photocurable adhesive;

[0006] The dichroic dye comprises an azo dye and an anthraquinone dye, and the mass ratio of the azo dye to the anthraquinone dye is (1-3):1;

[0007] The photocurable adhesive comprises, by weight, 45-70 parts of acrylic monomers, 25-50 parts of polyurethane acrylic oligomers and 0.5-2 parts of photoinitiators, wherein the polyurethane acrylic oligomers comprise difunctional polyurethane acrylate oligomers and trifunctional polyurethane acrylate oligomers.

[0008] Preferably, the dimming and haze-adjusting layer comprises the following raw material components by weight: 1.8%-3.6% of dichroic dye, 38%-58.2% of nematic liquid crystal and 40%-60% of photocurable adhesive.

[0009] Preferably, the nematic liquid crystal is a fluorinated nematic liquid crystal. The fluorinated nematic liquid crystal has a biphenyl structure with greater rigidity and better stability, and has good compatibility with azoanthraquinone mixed dyes. Further preferably, the △n of the fluorinated nematic liquid crystal is 0.15-0.3; more preferably, the △n of the fluorinated nematic liquid crystal is 0.22-0.25, the clearing point is ≥118°C, and the freezing point is ≤-40°C.

[0010] Preferably, the mass ratio of the azo dye to the anthraquinone dye is (1-2.5): 1. By controlling the mass ratio of the azo dye to the anthraquinone dye and using it in combination with a nematic phase liquid crystal having a fluorinated biphenyl structure with good stability, not only can the compatibility be improved, sufficient reaction can be performed, and stability is good; but also the weather resistance and contrast can be significantly improved.

[0011] Preferably, the dichroic dye comprises 12-20 parts of red azo, 26-35 parts of yellow azo, 12-18 parts of violet azo, and 32-50 parts of blue anthraquinone by weight.

[0012] Preferably, the photocurable adhesive comprises, by weight, 50-70 parts of acrylic monomer, 25-45 parts of polyurethane acrylic oligomer and 0.5-2 parts of photoinitiator; further preferably, the photocurable adhesive comprises, by weight, 55-70 parts of acrylic monomer, 28-42 parts of polyurethane acrylic oligomer and 0.8-2 parts of photoinitiator; more preferably, the photocurable adhesive comprises, by weight, 60-70 parts of acrylic monomer, 28-38 parts of polyurethane acrylic oligomer and 0.8-1.5 parts of photoinitiator.

[0013] Preferably, in the photocurable adhesive, the acrylic monomer is selected from one or a combination of methyl methacrylate, hydroxyethyl methacrylate, isobornyl acrylate, 2-acrylic acid-2-hydroxy-3-phenoxy lactone, 2-phenoxyethyl acrylate, 1,6-hexanediol diacrylate, and trimethylolpropane tri(meth)acrylate.

[0014] Preferably, in the photocurable adhesive, the difunctional polyurethane acrylate oligomer includes one or a combination of Guangdong Boxing New Materials B-296, Changxing Chemical 6123, Changxing Chemical 6172-1 or Sartomer CN8003 NS.

[0015] Preferably, in the photocurable adhesive, the trifunctional polyurethane acrylate oligomer includes at least one of Sartomer CN929, Guangdong Boxing B-374, Guangdong Boxing B-375, Changxing Chemical DR-U010, and Changxing Chemical DR-U026.

[0016] Preferably, in the photocurable adhesive, the polyurethane acrylate oligomer further includes a tetrafunctional polyurethane acrylate oligomer.

[0017] Preferably, the tetrafunctional polyurethane acrylate oligomer includes at least one of Sartomer CN8007 NS and Changxing Chemical DR-U052.

[0018] Preferably, in the photocurable adhesive, the photoinitiator includes one or a combination of TPO, 819, OXE01, 907, OXE02, and OXE03.

[0019] Preferably, the photocurable adhesive further comprises a surfactant or an auxiliary agent.

[0020] Preferably, the surfactant or auxiliary agent is selected from at least one of mercaptoacrylate, acrylic acid phosphate, methacrylate lauryl ester, and a silane coupling agent.

[0021] It should be noted that, according to the coating method and precision requirements, the raw material components of the dimming and haze-adjusting layer may also include spacer particles; the spacer particles may be glass beads of a certain size. If spacer particles are added, the mass of the spacer particles accounts for 0.5%-1.2% of the mass of the light-curing adhesive. The spacer particles may be selected from polystyrene black powder with a particle size of 10-30 microns. Under a microscope, the polystyrene black powder is observed to be uniform spherical particles, which can accurately control the thickness of the diaphragm.

[0022] The invention also provides a method for preparing a light-adjusting and haze-adjusting layer.

[0023] Specifically, a method for preparing a dimming and haze-adjusting layer comprises the following steps:

[0024] Mixing a dichroic dye and a nematic liquid crystal to prepare a dye liquid crystal material;

[0025] Weighing acrylic monomer, polyurethane acrylic oligomer and photoinitiator, mixing, and preparing adhesive material;

[0026] The dye liquid crystal material is mixed with the adhesive material, and then cured under ultraviolet light in the 380-400nm band to obtain a light-adjusting and haze-adjusting layer.

[0027] Preferably, the curing temperature is 20-35°C, and the intensity of the ultraviolet light is 15-30mw / cm 2 The curing time is 120-300s; further preferably, the curing temperature is 20-30°C, and the intensity of the ultraviolet light is 20-30mw / cm 2 , the curing time is 120-240s.

[0028] The invention also provides a light-adjusting and haze-adjusting film.

[0029] Specifically, a dimming and haze-adjusting film includes, from top to bottom, a first substrate layer, a first transparent conductive layer, the dimming and haze-adjusting layer, a second transparent conductive layer and a second substrate layer.

[0030] Preferably, the first substrate layer and the second substrate layer are UV-proof PET films. The use of UV-proof PET films can effectively block UV light below 380nm, thereby preventing UV light from damaging the dichroic dye and ensuring that the dye is not affected by UV light during the curing process.

[0031] Preferably, the thickness of the PET film is 50-188 μm; further preferably, the thickness of the PET film is 125-188 μm.

[0032] Preferably, the visible light transmittance of the PET film is ≥90%, the UV blocking rate of the PET film is ≥99%, and the haze of the PET film is ≤1%. Further preferably, the haze of the PET film is ≤0.5%.

[0033] Preferably, the thickness of the dimming and haze adjusting layer is 10-30 μm.

[0034] Preferably, the square resistance of the first transparent conductive layer and the second transparent conductive layer is 40-100Ω.

[0035] Preferably, the first transparent conductive layer and the second transparent conductive layer are ITO conductive films.

[0036] The invention also provides a method for preparing the light-adjusting and haze-adjusting film.

[0037] Specifically, a method for preparing a dimming and haze-adjusting film comprises the following steps:

[0038] Mixing a dichroic dye and a nematic liquid crystal to prepare a dye liquid crystal material;

[0039] Weighing acrylic monomer, polyurethane acrylic oligomer and photoinitiator, mixing, and preparing adhesive material;

[0040] Mixing the dye liquid crystal material with the adhesive material to prepare a light-adjusting and haze-adjusting layer material;

[0041] A first transparent conductive layer and a second transparent conductive layer are processed on one side of a first substrate layer and a second substrate layer respectively; then the dimming and haze-adjusting layer material is placed between the first transparent conductive layer and the second transparent conductive layer; and then cured by ultraviolet light to obtain a dimming and haze-adjusting film.

[0042] Preferably, the wavelength of the ultraviolet light is 380-400 nm. After the light-curing adhesive is mixed with the dye liquid crystal, the curing reaction is more complete and the curing effect is better under ultraviolet light within this wavelength range.

[0043] Preferably, the curing temperature is 20-35°C, and the intensity of the ultraviolet light is 4-30mw / cm 2 The curing time is 120-300s; further preferably, the curing temperature is 20-30°C, and the intensity of the ultraviolet light is 10-30mw / cm 2 , the curing time is 120-240s.

[0044] Preferably, after UV curing, the process further includes the steps of sheeting and edge sealing. Specifically, the steps of sheeting and edge sealing are: the dimming and haze-adjusting film is made into a sheet sample, and then edge sealed with an anti-UV tape or UV glue. Edge sealing of the dimming and haze-adjusting film can effectively block the influence of adverse factors such as UV, oxygen and moisture, and effectively protect the dimming and haze-adjusting film from all directions.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] (1) The dimming and haze-adjusting film provided by the present invention comprises a first substrate layer, a first transparent conductive layer, a dimming and haze-adjusting layer, a second transparent conductive layer and a second substrate layer, wherein the raw material components of the dimming and haze-adjusting layer prepared include: dichroic dyes, nematic liquid crystals and photocurable adhesives. The present invention optimizes the structure, selects the raw material components of the dimming and haze-adjusting layer, and especially controls the ratio of azo dyes and anthraquinone dyes in the dichroic dyes, as well as the components of the photocurable adhesives, so that the prepared dimming and haze-adjusting film has good visible light transmittance, haze and contrast when the power is on and off, and has excellent weather resistance and aging resistance.

[0047] (2) The dimming and haze-adjusting film provided in the embodiment of the present invention is cured by UV, which has high production efficiency and can avoid the negative impact of UV light during the curing process, thus facilitating production. DETAILED DESCRIPTION

[0048] In order to make the technical scheme of the present invention more clearly understood by those skilled in the art, the following embodiments are listed for illustration. It should be pointed out that the following embodiments do not limit the protection scope of the present invention.

[0049] Unless otherwise specified, the raw materials, reagents or devices used in the following examples can be obtained from conventional commercial sources or by existing known methods.

[0050] Example 1

[0051] A dimming and haze-adjusting layer comprises the following raw material components by weight percentage: 2.1% of dichroic dye, 49.9% of nematic phase liquid crystal, 47.6% of curing adhesive and 0.4% of spacer particles;

[0052] The dichroic dye includes an azo dye and an anthraquinone dye, wherein the mass ratio of the azo dye to the anthraquinone dye is 2.38:1; in parts by weight, the dye specifically includes 18 parts of red azo dye, 30 parts of yellow azo dye, 18 parts of purple azo dye and 48 parts of blue anthraquinone dye;

[0053] The nematic phase liquid crystal is a fluorinated nematic phase liquid crystal, the △n of the fluorinated nematic phase liquid crystal is 0.24, the clearing point is 121° C., and the freezing point is less than -40° C.

[0054] The photocurable adhesive comprises, by weight, 66 parts of acrylic monomers, 33 parts of polyurethane acrylate oligomers and 1 part of photoinitiator. Specifically, it comprises: 20 parts of methyl methacrylate, 28 parts of 2-acrylic acid-2-hydroxy-3-phenoxy lactone, 18 parts of 1,6-hexanediol diacrylate, 15 parts of difunctional polyurethane acrylate oligomers (7 parts of Sartomer CN8003 NS and 8 parts of Changxing Chemical 6123), 15 parts of trifunctional polyurethane acrylate oligomers (10 parts of Sartomer CN929 and 5 parts of Changxing Chemical DR-U026), 3 parts of tetrafunctional polyurethane acrylate oligomers (Sartomer CN8007 NS), and 1 part of OXE01;

[0055] The spacer particles are polystyrene black powder with a particle size of about 20 microns.

[0056] A method for preparing a dimming and haze-adjusting layer comprises the following steps:

[0057] The dichroic dye and the nematic phase liquid crystal are mixed to prepare the dye liquid crystal material; the acrylic monomer, the polyurethane acrylic oligomer and the photoinitiator are weighed and mixed to prepare the adhesive material;

[0058] The dye liquid crystal material, adhesive material and spacer particles are mixed and then cured under ultraviolet light in the 395nm band. The curing temperature is 25℃ and the intensity of the ultraviolet light is 25mw / cm 2 The curing time is 180s to obtain a dimming and haze-adjusting layer.

[0059] Example 2

[0060] The difference between Example 2 and Example 1 is that the photocurable adhesive includes 58 parts of acrylic monomer, 42 parts of polyurethane acrylate oligomer and 1 part of photoinitiator by weight. Specifically including: 20 parts of methyl methacrylate, 28 parts of 2-acrylic acid-2-hydroxy-3-phenoxy lactone, 10 parts of 1,6-hexanediol diacrylate, 20 parts of difunctional polyurethane acrylate oligomer (10 parts of Sartomer CN8003 NS and 10 parts of Changxing Chemical 6123), 20 parts of trifunctional polyurethane acrylate oligomer (10 parts of Sartomer CN929 and 10 parts of Changxing Chemical DR-U026), 2 parts of tetrafunctional polyurethane acrylate oligomer (Sartomer CN8007 NS), 1 part of OXE01. The remaining raw materials and preparation methods are the same as those in Example 1.

[0061] Example 3

[0062] The difference between Example 3 and Example 1 is that the dichroic dye includes an azo dye and an anthraquinone dye, and the mass ratio of the azo dye to the anthraquinone dye is 2.8:1; in terms of weight, it specifically includes 18 parts of red azo dye, 30 parts of yellow azo dye, 18 parts of purple azo dye, 18 parts of blue azo dye and 30 parts of blue anthraquinone dye.

[0063] Comparative Example 1

[0064] The difference between Comparative Example 1 and Example 1 is that the ditropic dye includes an azo dye and an anthraquinone dye, the mass ratio of the azo dye to the anthraquinone dye is 0.9:1; by weight, it specifically includes 18 parts of red azo dye, 18 parts of yellow azo dye, 18 parts of purple azo dye, 12 parts of yellow anthraquinone dye and 48 parts of blue anthraquinone dye. The remaining raw materials and preparation method are the same as in Example 1.

[0065] Comparative Example 2

[0066] The difference between Comparative Example 2 and Example 1 is that the photocurable adhesive includes 66 parts of acrylic monomer, 33 parts of polyurethane acrylate oligomer and 1 part of photoinitiator by weight. Specifically including: 20 parts of methyl methacrylate, 28 parts of 2-acrylic acid-2-hydroxy-3-phenoxy lactone, 18 parts of 1,6-hexanediol diacrylate, 25 parts of difunctional polyurethane acrylate oligomer (11 parts of Sartomer CN8003 NS and 14 parts of Changxing Chemical 6123), 8 parts of tetrafunctional polyurethane acrylate oligomer (Sartomer CN8007 NS), 1 part of OXE01. The remaining raw materials and preparation method are the same as those in Example 1.

[0067] Example 4

[0068] A dimming and haze-adjusting film comprises, from top to bottom, a first substrate layer (PET substrate film, 188 microns), a first transparent conductive layer, the dimming and haze-adjusting layer (25 microns), a second transparent conductive layer and a second substrate layer (PET substrate film).

[0069] A method for preparing a dimming and haze-adjusting film is as follows:

[0070] (1) Selecting 2 rolls of transparent PET base film with a center thickness of 188 μm as the first substrate layer and the second substrate layer, the UV blocking rate is 99%, the total light transmittance is 90%, and the haze is 0.5%;

[0071] (2) sputtering an ITO film on one side of two rolls of PET base film by magnetron sputtering, with a square resistance of 60Ω, to complete the production of the first transparent conductive layer and the second transparent conductive layer;

[0072] (3) Weighing a dichroic dye, a nematic liquid crystal, a curing adhesive and spacer particles according to the ratio of Example 1 to prepare a dye liquid crystal material and an adhesive material, respectively, and then fully mixing the dye liquid crystal material, the adhesive material and the spacer particles to prepare a dimming and haze adjusting material;

[0073] (4) Add the dimming and haze-adjusting material between the first transparent conductive layer and the second transparent conductive layer, and finally use 395nm ultraviolet light to cure and roll up. The curing temperature is 25°C and the UV light intensity is 25mw / cm 2 , the curing time is 180s.

[0074] (5) Prepare a sheet sample and seal the four sides with 395nm UV glue.

[0075] Example 5

[0076] The difference between Example 5 and Example 4 is that in step (3) of Example 5, the dichroic dye, nematic liquid crystal, curing adhesive and spacer particles are weighed according to the ratio of Example 2, and the remaining structures and steps are the same as Example 4.

[0077] Example 6

[0078] The difference between Example 6 and Example 4 is that in step (3) of Example 6, the dichroic dye, nematic liquid crystal, curing adhesive and spacer particles are weighed according to the ratio of Example 3, and the remaining structures and steps are the same as Example 4.

[0079] Comparative Example 3

[0080] The difference between Comparative Example 3 and Example 4 is that in step (3) of Comparative Example 3, the dichroic dye, nematic liquid crystal, curing adhesive and spacer particles are weighed according to the ratio of Comparative Example 1, and the remaining structures and steps are the same as Example 4.

[0081] Comparative Example 4

[0082] The difference between Comparative Example 4 and Example 4 is that in step (3) of Comparative Example 4, the dichroic dye, nematic liquid crystal, curing adhesive and spacer particles are weighed according to the ratio of Comparative Example 2, and the remaining structures and steps are the same as Example 4.

[0083] Product effect testing

[0084] The dimming and haze-adjusting films prepared in Examples 4-6 and Comparative Examples 3-4 were tested for basic performance and aging performance. They mainly included visible light transmittance, haze and color in the power-off state and the power-on state, and xenon lamp aging and double 85 tests after the dimming and haze-adjusting films were prepared into dimming and haze-adjusting glass. Xenon lamp test conditions: at 55°C, irradiation intensity: 500W / m 2 , irradiation for 1000h.

[0085] Double 85 test: Place at 85% humidity and 85°C for 1000 hours to evaluate the change rate of visible light transmittance, haze and color under power on and off before and after the experiment.

[0086] After testing, before the aging test and the double 85 test, the performance of the dimming and haze-adjusting films prepared in Examples 4-6 and Comparative Examples 3-4 is shown in Table 1. The performance change rates of the experimental evaluations are shown in Tables 2 and 3.

[0087] Table 1

[0088]

[0089] Table 2 Performance after xenon lamp test

[0090]

[0091] Table 3 Performance after dual 85 test

[0092]

[0093] As shown in Table 1, the dimming and haze-adjusting film provided by the embodiment of the present invention has a visible light transmittance of less than 2.3% in the off state, as low as 1.5%, and a haze of greater than 97%, as high as 98.5%. The visible light transmittance in the on state is greater than 30%, as high as 35%, and the haze is less than 3.3%, as low as 1.5%.

[0094] After xenon lamp aging, the performance change rate of the dimming and haze-adjusting film provided by the embodiment of the present invention is between 2.5% and 5.6%, and the performance change rate of the dimming and haze-adjusting film provided by the comparative example is between 7.5% and 9.5%.

[0095] After the double 85 test, the performance change rate of the dimming and haze-adjusting film provided by the embodiment of the present invention is between 2.6% and 5.6%, and the performance change rate of the dimming and haze-adjusting film provided by the comparative example is between 7.8% and 9.2%.

[0096] As can be seen from Tables 1 to 3, the dimming and haze-adjusting film provided in the embodiment of the present invention adopts UV curing, which has high production efficiency and can avoid the negative effects of UV light during the curing process, which is beneficial to production. In addition, the dimming and haze-adjusting film provided in the embodiment of the present invention has good visible light transmittance, haze and contrast under power on and off, and has excellent weather resistance and aging resistance.

[0097] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A dimming and haze-adjusting layer, characterized in that: The raw material components include, by weight percentage: 1.8%-3.6% of dichroic dye, 38%-58.2% of nematic phase liquid crystal and 40%-60% of photocurable adhesive; The dichroic dye comprises an azo dye and an anthraquinone dye, and the mass ratio of the azo dye to the anthraquinone dye is (2.38-3):1; The photocurable adhesive comprises, by weight, 45-70 parts of acrylic monomers, 25-50 parts of polyurethane acrylic oligomers and 0.5-2 parts of photoinitiators, wherein the polyurethane acrylic oligomers include difunctional polyurethane acrylate oligomers, trifunctional polyurethane acrylate oligomers and tetrafunctional polyurethane acrylate oligomers.

2. The dimming and haze-adjusting layer according to claim 1, characterized in that: In the photocurable adhesive, the acrylic monomer is selected from one or a combination of methyl methacrylate, hydroxyethyl methacrylate, isobornyl acrylate, 2-acrylic acid-2-hydroxy-3-phenoxy lactone, 2-phenoxyethyl acrylate, 1,6-hexanediol diacrylate, and trimethylolpropane tri(meth)acrylate.

3. The method for preparing a dimming and haze-adjusting layer according to any one of claims 1 to 2, characterized in that: The following steps are involved: Mixing a dichroic dye and a nematic liquid crystal to prepare a dye liquid crystal material; Weighing acrylic monomer, polyurethane acrylic oligomer and photoinitiator, mixing, and preparing adhesive material; The dye liquid crystal material is mixed with the adhesive material, and then cured under ultraviolet light in the 380-400nm band to obtain a light-adjusting and haze-adjusting layer.

4. A dimming and haze-adjusting film, characterized in that: From top to bottom, it includes in sequence a first substrate layer, a first transparent conductive layer, the dimming and haze-adjusting layer according to any one of claims 1 to 2, a second transparent conductive layer and a second substrate layer.

5. The dimming and haze-adjusting film according to claim 4, characterized in that: The first substrate layer and the second substrate layer are UV-resistant PET films.

6. The method for preparing the dimming and haze-adjusting film according to claim 4 or 5, comprising the following steps: Mixing a dichroic dye and a nematic liquid crystal to prepare a dye liquid crystal material; Weighing acrylic monomer, polyurethane acrylic oligomer and photoinitiator, mixing, and preparing adhesive material; Mixing the dye liquid crystal material with the adhesive material to prepare a light-adjusting and haze-adjusting layer material; A first transparent conductive layer and a second transparent conductive layer are processed on one side of a first substrate layer and a second substrate layer respectively; then the dimming and haze-adjusting layer material is placed between the first transparent conductive layer and the second transparent conductive layer; and then cured by ultraviolet light to obtain a dimming and haze-adjusting film.

7. The preparation method according to claim 6, characterized in that: The curing temperature is 20-35°C, the intensity of the ultraviolet light is 4-30mw / cm², and the curing time is 120-300s.

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