Dye PDLC (Polymer Dispersed Liquid Crystal) composition and PDLC dimming film

Abstract

The invention relates to the technical field of dimming films, in particular to a dye PDLC composition and a PDLC dimming film. Based on the total weight of the dye PDLC composition as 100%, the dye PDLC composition comprises the following components in percentage by weight: 35-66% of a liquid crystal composition, 3-7% of an anthraquinone dichroic dye, 30-60% of a polymer precursor, 0.05-3% of a photoinitiator and 0.2-1% of a spacer, and the polymer precursor comprises an oligomer and a reactive diluent in a mass ratio of 1: (2-7). According to the dye PDLC composition provided by the invention, all the components have a synergistic effect, and a PDLC dimming film prepared from the dye PDLC composition has relatively high off-state haze, relatively low on-state haze and relatively low driving voltage, and also has excellent properties of light absorption, heat insulation, wide all-light dimming range, color adjustability and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of dimming films, and in particular to a dye PDLC composition and a PDLC dimming film. Background Art

[0002] In recent years, a large number of electric vehicle brands with Internet genes have entered the market. Benefiting from electric intelligence, the penetration rate of panoramic skylights is getting higher and higher. In addition, it will gradually become a trend for traditional cars to be equipped with panoramic skylights. However, the panoramic glass skylight still has the problem of rising temperature inside the car due to exposure to the sun. Therefore, in view of the common pain points of the current smart electric vehicle skylight products, how to intelligently adjust the light entering the car and achieve a balance between vision and heat while meeting the needs of users in multiple scenarios has become the main research goal.

[0003] The existing smart glass market includes products such as PDLC (polymer dispersed liquid crystal film) smart glass and electrochromic smart glass. Electrochromic smart glass has problems such as complex film layer process, slow response time (8-20s), and blue color in dark state. Although PDLC smart glass can achieve free switching between transparency and haze, it does not block light, does not insulate heat, has a narrow viewing angle, and a narrow full-light dimming range (10-15%), which limits its application.

[0004] Therefore, it is of great significance to provide a new PDLC dimming film with excellent performance. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a dye PDLC composition and a PDLC dimming film. The components of the dye PDLC composition provided by the present invention act synergistically, and the PDLC dimming film prepared by using the dye PDLC composition has high off-state haze, low on-state haze and low driving voltage, and has excellent properties such as light absorption and heat insulation, wide full-light dimming range and adjustable color.

[0006] In a first aspect, the present invention provides a dye PDLC composition, wherein the total weight of the dye PDLC composition is 100%, and the dye PDLC composition comprises the following components in weight percentage:

[0007]

[0008] The polymer precursor comprises an oligomer and an active diluent in a mass ratio of 1:(2-7).

[0009] Wherein, the content of the liquid crystal composition can be 35%, 40%, 45%, 50%, 55%, 60%, 66% and the like.

[0010] The content of the anthraquinone-type dichroic dye may be 3%, 4%, 5%, 6%, 7%, etc.

[0011] The content of the polymer precursor may be 30%, 35%, 40%, 45%, 50%, 55%, 60%, etc.

[0012] The content of the photoinitiator can be 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 1%, 2%, 3%, etc.

[0013] The content of the interstitial particles may be 0.2%, 0.4%, 0.6%, 0.8%, 1%, etc.

[0014] The mass ratio of the oligomer to the reactive diluent may be 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, etc.

[0015] The components of the dye PDLC composition provided by the present invention work synergistically, and the PDLC dimming film with high off-state haze, low on-state haze and low voltage drive can be prepared by using the composition. The dimming film has an on-state haze of less than 2.5% at 48V, an off-state haze of greater than 95%, and a contrast ratio of greater than 4. It also has excellent properties such as light absorption and heat insulation, a wide full-light dimming range, and adjustable colors. Specifically:

[0016] The dye PDLC composition provided by the present invention contains anthraquinone-type dichroic dyes. On the one hand, the dye absorbs light, so that the prepared PDLC dimming film can absorb light and insulate heat. On the other hand, the anthraquinone-type dichroic dye is a molecule with dichroism, and has different absorbances along the long axis and short axis of the molecule to show different colors, which can further realize the switching between the bright state and the dark state of the PDLC dimming film, and can greatly improve the full light dimming range of the dimming film. In addition, the color of the PDLC dimming film can be adjusted in multiple colors, and can be customized to black, yellow, red, purple, blue and other monochromes to meet the requirements of buildings, cars, high-speed railways and airplanes for perception. At the same time, the liquid crystal composition provided by the present invention has good mutual solubility with the anthraquinone-type dichroic dye, and the PDLC dimming film prepared by coordinating with other components is not easy to precipitate during the polymerization process, and is not easy to fade, so as to have a lower open-state haze, and the dye will absorb part of the scattered light, which can further reduce the open-state haze. The synergistic effect between the components makes the prepared PDLC dimming film have a higher off-state haze, a lower open-state haze and a lower driving voltage.

[0017] As a preferred technical solution of the present invention, the anthraquinone-type dichroic dye includes any one or more of a dichroic dye having a structure shown in formula I, a dichroic dye having a structure shown in formula II, a dichroic dye having a structure shown in formula III, or a dichroic dye having a structure shown in formula IV;

[0018] in,

[0019]

[0020]

[0021] Wherein, A1 to A8 are each independently selected from any one or more of the following structures:

[0022]

[0023] R1 to R8 are each independently selected from any one or more of a straight chain or branched alkyl group, alkenyl group, alkoxy group, alkenyloxy group, alkylcarbonyl group, alkoxycarbonyl group, alkylcarbonyloxy group or alkoxycarbonyloxy group having 1 to 12 carbon atoms; m1 is 0, 1 or 2.

[0024] The dichroic dye described in the present invention refers to a light absorbing compound whose absorption properties depend on the polarization direction of the compound and the light. The anthraquinone-type dichroic dye compound provided by the present invention has an elongated shape, similar to the shape of the liquid crystal compound, and is significantly longer in one spatial direction (longitudinal axis) than in the other two spatial directions. Among them, the dichroic dye of the structure shown in formula I provides yellow in the system, the dichroic dye of the structure shown in formula II provides red in the system, the dichroic dye of the structure shown in formula III provides purple in the system, and the dichroic dye of the structure shown in formula IV provides blue in the system. The present invention makes a specific selection of dichroic dyes according to the target color, which can greatly improve the full light dimming range of the PDLC dimming film and meet the requirements of the dimming range of the dimming film in the art.

[0025] As a preferred technical solution of the present invention, A1 to A8 are independently selected from any one or more of the following structures:

[0026]

[0027]

[0028] As a preferred technical solution of the present invention, m1 is 1 or 2.

[0029] As a preferred technical solution of the present invention, the dichroic dye having the structure shown in Formula I includes any one or more of the compounds shown in Formulas I-1 to I-14:

[0030]

[0031]

[0032]

[0033] As a preferred technical solution of the present invention, the dichroic dye having the structure shown in formula II includes any one or more of the compounds shown in formulas II-1 to II-16:

[0034]

[0035]

[0036] As a preferred technical solution of the present invention, the dichroic dye having the structure shown in formula III includes any one or more of the compounds shown in formulas III-1 to III-10:

[0037]

[0038]

[0039] As a preferred technical solution of the present invention, the dichroic dye having the structure shown in formula IV includes any one or more of the compounds shown in formulas IV-1 to IV-12:

[0040]

[0041]

[0042] The dye PDLC composition provided by the present invention is a composition with positive dielectric anisotropy, wherein an anthraquinone type dichroic dye is used as a guest and a liquid crystal composition is used as a host, and the liquid crystal composition used as a host is preferably a nematic liquid crystal composition.

[0043] As a preferred technical solution of the present invention, the liquid crystal composition comprises any one or more of the compounds of the structure shown in Formula V:

[0044]

[0045] Among them, R 11 Selected from C1~C 12 Straight chain alkyl, C1~C 12 Straight chain alkoxy or C2~C 12 Any one or more of the straight-chain alkenyl groups;

[0046] A9 is selected from a benzene ring and / or a cyclohexyl ring;

[0047] X1 and Y1 are each independently selected from any one of H, F or Cl atoms; a3 and b3 are each independently 0 or 1, and are not 0 at the same time.

[0048] As a preferred technical solution of the present invention, the compound of the structure shown in Formula V includes any one or more of the compounds shown in Formulas V1 to V35:

[0049]

[0050]

[0051] As a preferred technical solution of the present invention, the compound represented by the structure of formula V is selected from any one or more of the compounds represented by formulas V2 to V17, V23 to V27 or V31 to V35. Among them, the compounds represented by V2 to V17 can better improve the mutual solubility of the liquid crystal composition, the compounds represented by V23 to V27 can more effectively improve the refractive index anisotropy of the liquid crystal composition, and the compounds represented by V31 to V35 can better improve the clearing point of the liquid crystal composition.

[0052] As a preferred technical solution of the present invention, the liquid crystal composition comprises any one or more of the compounds of the structure shown in Formula VI:

[0053]

[0054] Among them, R 12 Selected from C1~C 12 Straight chain alkyl, C1~C 12 Straight chain alkoxy or C2~C 12 any one or more of the straight-chain alkenyl groups; Z5 and Z6 are each independently selected from any one or more of -CH2CH2-, -CH=CH-, -CF2O-, -OCF2-, -CH2O-, -OCH2-, -CO-O-, -O-CO-, -C2F4-, -CF=CF-, -CH=CH-CH2O- or a CC single bond; X2 is selected from any one of H, F or Cl atoms; a4, b4 and c1 are each independently selected from 0 or 1, and a4 and b4 are not 0 or 1 at the same time.

[0055] As a preferred technical solution of the present invention, the compound of the structure shown in formula VI includes any one or more of the compounds shown in formulas VI1 to VI30:

[0056]

[0057]

[0058] As a preferred technical solution of the present invention, the compound represented by the structure of formula VI is selected from any one or more of the compounds represented by formulas VI3 to VI5, VI7 to VI17 or VI22 to VI25. Among them, the compounds represented by formulas VI3 to VI5 can better improve the mutual solubility of the liquid crystal composition, and the compounds represented by formulas VI7 to VI17 and VI22 to VI25 can better increase the solubility of the liquid crystal composition in the polymer precursor.

[0059] As a preferred technical solution of the present invention, the liquid crystal composition comprises any one or more of the compounds of the structure shown in formula VII:

[0060]

[0061] Among them, R 13 and R 14 Each independently selected from C1 to C 12 Straight chain alkoxy or C2~C 12 Any one or more of the straight-chain alkenyl groups.

[0062] As a preferred technical solution of the present invention, the compound of the structure shown in formula VII includes any one or more of the compounds shown in formulas VII1 to VII20:

[0063]

[0064] As a preferred technical solution of the present invention, the compound of the structure represented by formula VII is selected from any one or more of the compounds represented by formula VII3, VII5, VII13, VII15 or VII20. The preferred compound can more effectively increase the solubility of the liquid crystal composition in the polymer precursor.

[0065] As a preferred technical solution of the present invention, the liquid crystal composition comprises any one or more of the compounds of the structure shown in Formula VIII:

[0066]

[0067] Among them, R 15 and R 16 Each independently selected from C1 to C 12 Straight chain alkyl, C1~C 12 Straight chain alkoxy or C2~C 12 any one or more of the straight-chain alkenyl groups, X3 is selected from any one of H, F or Cl atoms, and a5 is selected from 0 or 1.

[0068] As a preferred technical solution of the present invention, the compound of the structure represented by formula VIII includes any one or more of the compounds represented by formulas VIII1 to VIII18:

[0069]

[0070] As a preferred technical solution of the present invention, the compound of the structure represented by formula VIII is selected from any one or more of the compounds represented by formula VIII9, VIII10, VIII11, VIII13, VIII14, VIII15, VIII16 or VIII18. The preferred compound can more effectively increase the refractive index anisotropy and mutual solubility of the liquid crystal composition.

[0071] As a preferred technical solution of the present invention, the liquid crystal composition has a clearing point >70°C, a melting point <-20°C, an optical anisotropy of 0.12-0.3, and a dielectric anisotropy >7.

[0072] As a preferred technical solution of the present invention, the number average molecular weight of the oligomer is 300-800, for example, 300, 400, 500, 600, 700, 800, etc.

[0073] As a preferred technical solution of the present invention, the oligomer includes any one or more of polyurethane acrylate, epoxy acrylate, acrylic prepolymer, polyester acrylate, polyether acrylate, polybutadiene acrylate and polyamide.

[0074] As a preferred technical solution of the present invention, the active diluent is selected from any one or more of methyl methacrylate, hydroxyethyl methacrylate, 1,4-butanediol diacrylate, 4-hydroxybutyl acrylate, 2-hydroxypropyl methacrylate, ethyl methacrylate, n-octyl methacrylate, 2-dodecyl acrylate, 1,6-hexanediol diacrylate, trimethylolpropane triacrylate, isobornyl acrylate, isobornyl methacrylate, hydroxydicyclopentene, dicyclopentenyl acrylic acid or N-acryloylmorpholine.

[0075] As a preferred technical solution of the present invention, the photoinitiator is selected from any one or more of benzoin and its ether photoinitiators, benzil dialkyl ketal photoinitiators, aromatic ketone photoinitiators, oxime ester photoinitiators, thioxanthone photoinitiators or phosphine oxide photoinitiators.

[0076] As a preferred technical solution of the present invention, the photoinitiator is selected from any one or more of aromatic ketone photoinitiators, oxime ester photoinitiators or phosphine oxide photoinitiators.

[0077] As a preferred technical solution of the present invention, the photoinitiator is selected from any one or more of 2-hydroxy-2-methyl-1-1 phenylpropanone, 2-benzyl-2-2 dimethylamino-1-(4-morpholinylphenyl)-1-butanone, 1-hydroxycyclohexyl-phenyl ketone, 2,2-dimethoxy-2-phenylacetophenone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, di(2,4,6-trimethylbenzoyl)-phenylphosphine oxide, 2-isopropylthioxanthone, 2,4-diethylthioxanthone or tetraethyl Michler's ketone or OXE-01.

[0078] As a preferred technical solution of the present invention, the particle size of the spacers is 10-30 μm, such as 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, etc., preferably 10-20 μm.

[0079] As a preferred technical solution of the present invention, the spacers include silicon ball spacers and / or plastic ball spacers.

[0080] In a second aspect, the present invention provides a PDLC dimming film, wherein the PDLC dimming film is prepared from the dye PDLC composition described in the first aspect.

[0081] The present invention obtains a PDLC dimming film with higher off-state haze, lower on-state haze and lower driving voltage by controlling the types and contents of liquid crystal compositions, dyes, polymer precursors, photoinitiators and the like.

[0082] The technical solution provided by the embodiment of the present invention has the following advantages compared with the prior art:

[0083] 1. The components of the dye PDLC composition provided by the present invention act synergistically, and the PDLC dimming film prepared using the dye PDLC composition has higher off-state haze, lower on-state haze and lower driving voltage, and also has excellent properties such as light absorption and heat insulation, wide full-light dimming range and adjustable color.

[0084] 2. The PDLC dimming film provided by the present invention has an on-state haze of less than 2.5% at 48V, an off-state haze of greater than 95%, and a contrast ratio of greater than 4. DETAILED DESCRIPTION

[0085] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0086] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0087] Examples 1-6

[0088] This embodiment provides a dye PDLC composition, and the composition of the dye PDLC composition is shown in Table 1:

[0089] Table 1

[0090]

[0091]

[0092] The compositions of the liquid crystal compositions in Examples 1-4 are shown in Table 2:

[0093] Table 2

[0094] Compound Example 1 Example 2 Example 3 Example 4 V2 22％ 22％ 15％ 15％ V17 8％ 8％ 10％ 10％ V25 10％ 10％ 10％ 10％ V9 12％ 12％ 10％ 10％ Ⅵ4 6％ 6％ 6％ 6％ Ⅵ5 5％ 5％ 7％ 7％ Ⅵ17 5％ 5％ 7％ 7％ Ⅶ3 5％ 5％ 9％ 9％ Ⅶ5 12％ 12％ 9％ 9％ Ⅶ15 4％ 4％ 7％ 7％ Ⅷ9 4％ 4％ 4％ 4％ Ⅷ10 4％ 4％ - - Ⅷ11 3％ 3％ 3％ 3％ Ⅷ13 - - 3％ 3％

[0095] The composition of the liquid crystal composition in Examples 5-6 is shown in Table 3:

[0096] Table 3

[0097]

[0098]

[0099] Through testing, it was found that the Cp of the liquid crystal composition provided in Examples 1 and 2 was 117.8, Δn was 0.239, and Δε was 17.4; the Cp of the liquid crystal composition provided in Examples 3 and 4 was 114.7, Δn was 0.244, and Δε was 14.6; the Cp of the liquid crystal composition provided in Examples 5 and 6 was 104.6, Δn was 0.235, and Δε was 14.8.

[0100] The dichroic dyes described in Examples 1 and 2 are mixtures of compounds represented by formulas I-5, I-1, II-1, III-1, and IV-3, and the mass ratio of the compounds represented by formulas I-5, I-1, II-1, III-1, and IV-3 is 0.3:0.3:1.2:0.7:1.6;

[0101] The dichroic dyes described in Examples 3 and 4 are mixtures of compounds represented by formulas I-5, II-2, III-2, IV-1, and IV-4, and the mass ratio of the compounds represented by formulas I-5, II-2, III-2, IV-1, and IV-4 is 0.8:1.3:0.7:0.9:1.2;

[0102] The dichroic dye described in Examples 5 and 6 is a mixture of compounds represented by formula I-5, II-7, III-4, and IV-12, and the mass ratio of the compounds represented by formula I-5, II-7, III-4, and IV-12 is 1.2:0.9:1.3:2.2.

[0103] The composition of the active diluent described in Examples 1-6 is shown in Table 4:

[0104] Table 4

[0105]

[0106]

[0107] The oligomer described in Examples 1-6 is polyurethane acrylate, and the interstitial particle size is 20 μm; the photoinitiator is phenyl bis (2,4,6-trimethylbenzoyl) phosphine oxide.

[0108] Embodiment 7-8

[0109] This embodiment provides a PDLC composition, and the composition of the dye PDLC composition is the same as that of Example 1. The difference from Example 1 is that in this embodiment, the content of the anthraquinone dichroic dye is 3% (Example 7) and 7% (Example 8), and the other components are reduced or increased in the same proportion.

[0110] Comparative Example 1

[0111] This comparative example provides a PDLC composition. The composition of the dye PDLC composition is the same as that of Example 1. The difference from Example 1 is that in this comparative example, no dichroic dye is added.

[0112] Comparative Examples 2-3

[0113] This comparative example provides a PDLC composition, and the composition of the dye PDLC composition is the same as that of Example 1. The difference from Example 1 is that in this comparative example, the content of the anthraquinone-type dichroic dye is 1% (Comparative Example 2) and 10% (Comparative Example 3), and the other components are increased or decreased in the same proportion.

[0114] Application Examples

[0115] The PDLC dimming film was prepared using the PDLC composition provided in the examples and comparative examples, and the preparation method was as follows:

[0116] (1) uniformly mixing a formulated amount of a dichroic dye and a liquid crystal composition to obtain a mixture A;

[0117] (2) uniformly mixing the active diluent and the oligomer to obtain a mixture B;

[0118] (3) Mixing the mixture A and the mixture B at room temperature to obtain a mixture C; adding a photoinitiator and a spacer to the mixture C and stirring evenly at room temperature in the dark to obtain a dye PDLC composition;

[0119] (4) The obtained dye PDLC composition is uniformly coated between two transparent substrates with ITO conductive layers, and a PDLC dimming film is obtained after cutting and UV curing.

[0120] Performance Testing

[0121] (1) The dimming films prepared in the examples and comparative examples were subjected to a 60V, 50Hz sine wave to test the haze and transmittance in the switching state, the contrast of the films was calculated, and the changes in the appearance of the samples were observed.

[0122] The test results are shown in Table 5:

[0123] Table 5

[0124] project 0V haze 0V transmittance 48V fog 48V Transmittance Contrast Example 1 95.42％ 4.46％ 2.03％ 19.21％ 4.3 Example 2 95.25％ 4.75％ 2.05％ 19.38％ 4.1 Example 3 95.90％ 3.96％ 2.11％ 18.80％ 4.7 Example 4 95.96％ 3.94％ 2.28％ 18.41％ 4.7 Example 5 96.13％ 3.01％ 2.13％ 17.16％ 5.7 Example 6 96.62％ 3.06％ 2.16％ 17.75％ 5.8 Example 7 95.72％ 5.05％ 2.67％ 20.23％ 4.0 Example 8 96.34％ 2.57％ 1.97％ 15.93％ 6.2 Comparative Example 1 95.67％ 63.85％ 3.51％ 83.97％ 1.3 Comparative Example 2 96.32％ 26.89％ 2.67％ 63.95 2.3 Comparative Example 3 65.29％ 1.17％ 3.05％ 9.36％ 8.0

[0125] From the results in Table 5, it can be found that the PDLC dimming film prepared by using the dye PDLC composition provided by the present invention has a high off-state haze of more than 95%, a low haze when powered at 48V, preferably less than 2.5%, a low driving voltage, and a contrast ratio greater than 4. From the comparison between Example 1 and Comparative Example 1, it can be found that when the dichroic dye of the present invention is not added, the contrast ratio of the dimming film is as low as 1.3; from the comparison between Example 1 and Comparative Example 2, it can be found that when too little dichroic dye is added, the contrast improvement effect is poor, and when too much dichroic dye is added, although the contrast ratio is improved, the solubility is reduced, and the uniformity of the prepared PDLC film is poor.

[0126] (2) The dimming films prepared in the examples and comparative examples were subjected to color difference analysis, and the method was as follows: the dye PDLC composition was coated onto two transparent substrates with ITO conductive layers by a coating machine, and the L*, a*, and b* values ​​of the samples were tested before UV curing, which were recorded as L0*, a0*, and b0*; after UV curing, the L*, a*, and b* values ​​of the films were measured again, which were recorded as L1*, a1*, and b1*, and the ΔL*, Δa*, and Δb* values ​​were further calculated, where:

[0127] ΔL*=L0*-L1*;

[0128] Δa*=a0*-a1*;

[0129] Δb*=b0*-b1*;

[0130] Calculate the total color difference ΔE according to the following formula:

[0131] ΔE=[(ΔL*) 2 +(Δa*) 2 +(Δb*) 2 ] 1 / 2 ;

[0132] When ΔE<2, the human eye cannot detect it, thus meeting the color difference change requirement.

[0133] The results are shown in Table 6:

[0134] Table 6

[0135]

[0136]

[0137] It can be found from Tables 5 and 6 that the PDLC dimming film prepared using the dye PDLC composition provided by the present invention has a lower on-state haze, a higher off-state haze, and a higher contrast; and after UV curing, the color change is relatively small, which shows that the PDLC dimming film prepared by the present invention has a high contrast, good optical properties and good light resistance stability.

[0138] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0139] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments described herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dye PDLC composition, characterized in that: Taking the total weight of the dye PDLC composition as 100%, the dye PDLC composition includes the following components in weight percentage: The polymer precursor comprises an oligomer and an active diluent in a mass ratio of 1:(2-7).

2. The dye PDLC composition according to claim 1, characterized in that The anthraquinone-type dichroic dye includes any one or more of a dichroic dye having a structure shown in formula I, a dichroic dye having a structure shown in formula II, a dichroic dye having a structure shown in formula III, or a dichroic dye having a structure shown in formula IV; in, Wherein, A1 to A8 are each independently selected from any one or more of the following structures: R1 to R8 are each independently selected from any one or more of a straight chain or branched alkyl group, alkenyl group, alkoxy group, alkenyloxy group, alkylcarbonyl group, alkoxycarbonyl group, alkylcarbonyloxy group or alkoxycarbonyloxy group having 1 to 12 carbon atoms; m1 is 0, 1 or 2.

3. The dye PDLC composition according to claim 1 or 2, characterized in that: The dichroic dye of the structure shown in Formula I includes any one or more of the compounds shown in Formulas I-1 to I-14: And / or, the dichroic dye having the structure shown in formula II includes any one or more of the compounds shown in formula II-1 to II-16: And / or, the dichroic dye having the structure shown in formula III includes any one or more of the compounds shown in formulas III-1 to III-10: And / or, the dichroic dye having the structure shown in formula IV includes any one or more of the compounds shown in formulas IV-1 to IV-12:

4. The dye PDLC composition according to any one of claims 1 to 3, characterized in that: The liquid crystal composition comprises any one or more of the compounds of the structure shown in Formula V: Among them, R 11 Selected from C1~C 12 Straight chain alkyl, C1~C 12 Straight chain alkoxy or C2~C 12 Any one or more of the straight-chain alkenyl groups; A9 is selected from a benzene ring and / or a cyclohexyl ring; X1 and Y1 are each independently selected from any one of H, F or Cl atoms; a3 and b3 are each independently 0 or 1, and are not 0 at the same time; Preferably, the compound of the structure shown in Formula V includes any one or more of the compounds shown in Formulas V1 to V35:

5. The dye PDLC composition according to any one of claims 1 to 4, characterized in that: The liquid crystal composition comprises any one or more of the compounds of the structure shown in formula VI: Among them, R 12 Selected from C1~C 12 Straight chain alkyl, C1~C 12 Straight chain alkoxy or C2~C 12 any one or more of the straight-chain alkenyl groups; Z5 and Z6 are each independently selected from any one or more of -CH2CH2-, -CH=CH-, -CF2O-, -OCF2-, -CH2O-, -OCH2-, -CO-O-, -O-CO-, -C2F4-, -CF=CF-, -CH=CH-CH2O- or a CC single bond; X2 is selected from any one of H, F or Cl atoms; a4, b4 and c1 are each independently selected from 0 or 1, and a4 and b4 are not 0 or 1 at the same time; Preferably, the compound of the structure represented by formula VI includes any one or more of the compounds represented by formulas VI1 to VI30:

6. The dye PDLC composition according to any one of claims 1 to 5, characterized in that: The liquid crystal composition comprises any one or more of the compounds of the structure shown in formula VII: Among them, R 13 and R 14 Each independently selected from C1 to C 12 Straight chain alkoxy or C2~C 12 Any one or more of the straight-chain alkenyl groups; Preferably, the compound of the structure represented by formula VII includes any one or more of the compounds represented by formulas VII1 to VII20:

7. The dye PDLC composition according to any one of claims 1 to 6, characterized in that: The liquid crystal composition comprises any one or more of the compounds of the structure shown in Formula VIII: Among them, R 15 and R 16 Each independently selected from C1 to C 12 Straight chain alkyl, C1~C 12 Straight chain alkoxy or C2~C 12 Any one or more of the straight-chain alkenyl groups of , X3 is selected from any one of H, F or Cl atoms, and a5 is selected from 0 or 1; Preferably, the compound of the structure represented by formula VIII includes any one or more of the compounds represented by formulas VIII1 to VIII18:

8. The dye PDLC composition according to any one of claims 1 to 7, characterized in that: The number average molecular weight of the oligomer is 300-800; and / or, the oligomer comprises any one or more of polyurethane acrylate, epoxy acrylate, acrylic prepolymer, polyester acrylate, polyether acrylate, polybutadiene acrylate and polyamide; And / or, the active diluent is selected from any one or more of methyl methacrylate, hydroxyethyl methacrylate, 1,4-butanediol diacrylate, 4-hydroxybutyl acrylate, 2-hydroxypropyl methacrylate, ethyl methacrylate, n-octyl methacrylate, 2-dodecyl acrylate, 1,6-hexanediol diacrylate, trimethylolpropane triacrylate, isobornyl acrylate, isobornyl methacrylate, hydroxydicyclopentene, dicyclopentenyl acrylic acid or N-acryloylmorpholine.

9. The dye PDLC composition according to any one of claims 1 to 8, characterized in that: The photoinitiator is selected from any one or more of benzoin and its ether photoinitiators, benzil dialkyl ketal photoinitiators, aromatic ketone photoinitiators, oxime ester photoinitiators, thioxanthone photoinitiators or phosphine oxide photoinitiators; And / or, the particle size of the interstitial particles is 10-30 μm.

10. A PDLC dimming film, characterized in that: The PDLC dimming film is prepared from the dye PDLC composition according to any one of claims 1 to 9.

Images