Dye PDLC composition and PDLC dimming film

Abstract

The present invention relates to the technical field of dimming films, and in particular, to a dye PDLC composition and a PDLC dimming film. Based on the total weight of the dye PDLC composition being 100%, the dye PDLC composition comprises the following components in weight percentage: a liquid crystal composition 35-66%, an anthraquinone-type dichroic dye 3-7%, a polymer precursor 30-60%, a photoinitiator 0.05-3%, and a spacer 0.2-1%, the polymer precursor comprising an oligomer and a reactive diluent in a mass ratio of 1:(2-7). In the dye PDLC composition provided by the present invention, the components synergistically interact, and the PDLC dimming film prepared therefrom exhibits high off-state haze, low on-state haze, and low driving voltage, while also having excellent performance in light absorption and heat insulation, a wide full-light dimming range, and adjustable color.

Description

A dye PDLC composition and a PDLC dimming film

[0001] Cross-references

[0002] This application claims priority to Chinese Patent Application No. 202411574513.3, filed on November 6, 2024, entitled “A Dye PDLC Composition and PDLC Dimming Film”, the entire disclosure of which is incorporated herein by reference. Technical Field

[0003] This invention relates to the field of dimming film technology, and more particularly to a dye PDLC composition and a PDLC dimming film. Background Technology

[0004] In recent years, a large number of electric vehicle brands with internet DNA have entered the market. Benefiting from electrification and intelligentization, the penetration rate of panoramic sunroofs is increasing, and the integration of panoramic sunroofs into traditional vehicles is also gradually becoming a trend. However, panoramic glass sunroofs still suffer from the problem of increased interior temperature due to exposure to direct sunlight. Therefore, addressing the common pain points of current intelligent electric vehicle sunroof products, the main research objective is to intelligently adjust the light entering the vehicle to achieve a balance between visibility and heat while meeting the needs of users in various scenarios.

[0005] The current smart glass market includes products such as PDLC (polymer dispersed liquid crystal film) smart glass and electrochromic smart glass. Electrochromic smart glass suffers from problems such as complex film layer processes, slow response time (8-20s), and a bluish tint in dark states. While PDLC smart glass can freely switch 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%), thus limiting its applications.

[0006] Therefore, it is of great significance to provide a new PDLC dimming film with excellent performance. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention provides a dye-based PDLC composition and a PDLC dimming film. The components of the dye-based PDLC composition provided by this invention work synergistically, resulting in a PDLC dimming film with high off-state haze, low on-state haze, and low driving voltage. It also exhibits excellent properties such as light absorption and heat insulation, a wide range of dimming capabilities, and adjustable color.

[0008] In a first aspect, the present invention provides a dye PDLC composition, wherein, based on 100% of the total weight of the dye PDLC composition, the dye PDLC composition comprises the following components by weight percentage:

[0009] The polymer precursor comprises an oligomer and an active diluent in a mass ratio of 1:(2-7).

[0010] The content of the liquid crystal composition can be 35%, 40%, 45%, 50%, 55%, 60%, 66%, etc.

[0011] The content of the anthraquinone dichroic dye can be 3%, 4%, 5%, 6%, 7%, etc.

[0012] The content of the polymer precursor can be 30%, 35%, 40%, 45%, 50%, 55%, 60%, etc.

[0013] The content of the photoinitiator can be 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 1%, 2%, 3%, etc.

[0014] The content of the interstitial spacer can be 0.2%, 0.4%, 0.6%, 0.8%, 1%, etc.

[0015] The mass ratio of the oligomer to the reactive diluent can be 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, etc.

[0016] The dye PDLC composition provided by this invention exhibits synergistic effects among its components, enabling the preparation of a PDLC dimming film with high off-state haze, low on-state haze, and low voltage drive. This dimming film has an on-state haze of less than 2.5% and an off-state haze of greater than 95% at 48V, with a contrast ratio greater than 4. It also possesses excellent properties such as light absorption and heat insulation, a wide full-light dimming range, and adjustable color. Specifically:

[0017] The dye-based PDLC composition provided by this invention contains anthraquinone dichroic dyes. On one hand, the dyes absorb light, enabling the prepared PDLC dimming film to absorb light and insulate heat. On the other hand, anthraquinone dichroic dyes are dichroic molecules with different absorbance along their long and short axes, thus displaying different colors. This further enables the switching between bright and dark states of the PDLC dimming film and significantly improves the full-spectrum dimming range. Additionally, the PDLC dimming film can be multi-colored and customized to single colors such as black, yellow, red, purple, and blue, meeting the visual requirements of architecture, automobiles, high-speed rail, and aircraft. Furthermore, the liquid crystal composition provided by this invention has good miscibility with the anthraquinone dichroic dyes. The PDLC dimming film prepared in conjunction with other components is less prone to precipitation and fading during polymerization, resulting in lower on-state haze. The dyes also absorb some scattered light, further reducing on-state haze. The synergistic effect between the components results in a PDLC dimming film with higher off-state haze, lower on-state haze, and lower driving voltage.

[0018] As a preferred embodiment of the present invention, the anthraquinone-type dichroic dye includes any one or more of the following: dichroic dyes with the structure shown in Formula I, dichroic dyes with the structure shown in Formula II, dichroic dyes with the structure shown in Formula III, or dichroic dyes with the structure shown in Formula IV.

[0019] in,

[0020] Wherein, A1 to A8 are each independently selected from any one or more of the following structures:

[0021] R1 to R8 are each independently selected from any one or more of straight-chain or branched alkyl, alkenyl, alkoxy, enalkoxy, alkyl carbonyl, alkoxy carbonyl, alkyl carbonyloxy, or alkoxy carbonyloxy groups with 1 to 12 carbon atoms; m1 is 0, 1, or 2.

[0022] The dichroic dyes described in this invention refer to light-absorbing compounds whose absorption properties depend on the polarization direction of the compound and the light. The anthraquinone-type dichroic dye compounds provided by this invention have elongated shapes, similar to those of liquid crystal compounds, and are significantly longer in one spatial direction (longitudinal axis) than in the other two spatial directions. Specifically, the dichroic dye with the structure shown in Formula I provides yellow in the system, the dichroic dye with the structure shown in Formula II provides red, the dichroic dye with the structure shown in Formula III provides purple, and the dichroic dye with the structure shown in Formula IV provides blue. This invention allows for specific selection of dichroic dyes based on the target color, which can significantly improve the full-spectrum dimming range of PDLC dimming films, meeting the requirements of the art for the dimming range of dimming films.

[0023] As a preferred embodiment of the present invention, A1 to A8 are each independently selected from any one or more of the following structures:

[0024] In a preferred embodiment of the present invention, m1 is 1 or 2.

[0025] As a preferred embodiment of the present invention, the dichroic dye with the structure shown in Formula I includes any one or more of the compounds shown in Formulas I-1 to I-14:

[0026] As a preferred embodiment of the present invention, the dichroic dye with the structure shown in Formula II includes any one or more of the compounds shown in Formulas II-1 to II-16:

[0027] As a preferred embodiment of the present invention, the dichroic dye with the structure shown in Formula III includes any one or more of the compounds shown in Formulas III-1 to III-10:

[0028] As a preferred embodiment of the present invention, the dichroic dye with the structure shown in Formula IV includes any one or more of the compounds shown in Formulas IV-1 to IV-12:

[0029] The dye PDLC composition provided by the present invention is a positive dielectric anisotropic composition, wherein anthraquinone dichroic dye is used as the guest and liquid crystal composition is used as the host, and the liquid crystal composition used as the host is preferably a nematic liquid crystal composition.

[0030] As a preferred embodiment of the present invention, the liquid crystal composition comprises any one or more compounds with the structure shown in Formula V:

[0031] Among them, R 11 Selected from C1 to C 12 Straight-chain alkyl groups, C1-C 12 Straight-chain alkoxy or C2-C 12 Any one or more of the straight-chain alkenyl groups;

[0032] A9 is selected from benzene rings and / or cyclohexane rings;

[0033] 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 not both 0 at the same time.

[0034] As a preferred embodiment of the present invention, the compound with the structure shown in Formula V includes any one or more of the compounds shown in Formulas V1 to V35:

[0035] As a preferred embodiment of the present invention, the compound with the structure shown in Formula V is selected from any one or more of the compounds shown in Formulas V2 to V17, V23 to V27, or V31 to V35. Specifically, the compounds shown in V2 to V17 can better improve the miscibility of the liquid crystal composition, the compounds shown in V23 to V27 can more effectively improve the refractive index anisotropy of the liquid crystal composition, and the compounds shown in V31 to V35 can better improve the clearing point of the liquid crystal composition.

[0036] As a preferred embodiment of the present invention, the liquid crystal composition comprises any one or more compounds with the structure shown in Formula VI:

[0037] Among them, R 12 Selected from C1 to C 12 Straight-chain alkyl groups, C1-C 12 Straight-chain alkoxy or C2-C 12 Z5 and Z6 are each independently selected from any one or more of the straight-chain alkenyl groups, -CH=CH-, -CF2O-, -OCF2-, -CH2O-, -OCH2-, -CO-O-, -O-CO-, -C2F4-, -CF=CF-, -CH=CH-CH2O- or CC single bonds; 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 simultaneously 0 or 1.

[0038] As a preferred embodiment of the present invention, the compound with the structure shown in Formula VI includes any one or more of the compounds shown in Formulas VI1 to VI30:

[0039] As a preferred embodiment of the present invention, the compound with the structure shown in Formula VI is selected from any one or more of the compounds shown in Formulas VI3-VI5, VI7-VI17, or VI22-VI25. Specifically, the compounds shown in Formulas VI3-VI5 can better improve the miscibility of the liquid crystal composition, while the compounds shown in Formulas VI7-VI17 and VI22-VI25 can better increase the solubility of the liquid crystal composition in the polymer precursor.

[0040] As a preferred embodiment of the present invention, the liquid crystal composition comprises any one or more compounds with the structure shown in Formula VII:

[0041] Among them, R 13 and R 14 Each is independently selected from C1 to C2. 12 Straight-chain alkoxy or C2-C 12 Any one or more of the straight-chain alkenyl groups.

[0042] As a preferred embodiment of the present invention, the compound with the structure shown in Formula VII includes any one or more of the compounds shown in Formulas VII1 to VII20:

[0043] As a preferred embodiment of the present invention, the compound with the structure shown in Formula VII is selected from any one or more of the compounds shown in Formulas VII3, VII5, VII13, VII15, or VII20. This preferred compound can more effectively increase the solubility of the liquid crystal composition in the polymer precursor.

[0044] As a preferred embodiment of the present invention, the liquid crystal composition comprises any one or more compounds with the structure shown in Formula VIII:

[0045] Among them, R 15 and R 16 Each is independently selected from C1 to C2. 12 Straight-chain alkyl groups, C1-C 12 Straight-chain alkoxy or C2-C 12 It consists of any one or more straight-chain alkenyl groups, X3 is selected from any one of H, F or Cl atoms, and a5 is selected from 0 or 1.

[0046] As a preferred embodiment of the present invention, the compound with the structure shown in Formula VIII includes any one or more of the compounds shown in Formulas VIII1 to VIII18:

[0047] As a preferred embodiment of the present invention, the compound with the structure shown in Formula VIII is selected from any one or more of the compounds shown in Formulas VIII9, VIII10, VIII11, VIII13, VIII14, VIII15, VIII16, or VIII18. This preferred compound can more effectively increase the refractive index anisotropy and miscibility of the liquid crystal composition.

[0048] As a preferred embodiment 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.

[0049] As a preferred embodiment of the present invention, the number average molecular weight of the oligomer is 300-800, for example, it can be 300, 400, 500, 600, 700, 800, etc.

[0050] As a preferred embodiment 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.

[0051] As a preferred embodiment of the present invention, the reactive 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, dodecyl 2-acrylate, 1,6-hexanediol diacrylate, trimethylolpropane triacrylate, isobornyl acrylate, isobornyl methacrylate, hydroxybicyclopentene, dicyclopentenyl acrylate, or N-acryloylmorpholine.

[0052] As a preferred embodiment of the present invention, the photoinitiator is selected from any one or more of benzoin and its ether photoinitiators, benzoyldialkyl ketal photoinitiators, aromatic ketone photoinitiators, oxime ester photoinitiators, thioxanthone photoinitiators, or phosphine oxide photoinitiators.

[0053] As a preferred embodiment of the present invention, the photoinitiator is selected from any one or more of aromatic ketone photoinitiators, oxime ester photoinitiators, or phosphine oxide photoinitiators.

[0054] As a preferred embodiment 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-isopropylthioxanthanone, 2,4-diethylthioxanthanone, or tetraethylmiechone, or OXE-01.

[0055] As a preferred embodiment of the present invention, the particle size of the spacer is 10-30 μm, such as 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, etc., preferably 10-20 μm.

[0056] As a preferred embodiment of the present invention, the spacer includes silicon ball spacers and / or plastic ball spacers, etc.

[0057] In a second aspect, the present invention provides a PDLC dimming film, which is prepared from the dye PDLC composition described in the first aspect.

[0058] This invention obtains a PDLC dimming film with high off-state haze, low on-state haze, and low driving voltage by controlling the types and contents of liquid crystal composition, dye, polymer precursor, photoinitiator, etc.

[0059] The technical solution provided by the embodiments of the present invention has the following advantages compared with the prior art:

[0060] 1. The dye PDLC composition provided by the present invention has a synergistic effect among its components, and the PDLC dimming film prepared by it has high off-state haze, low on-state haze and low driving voltage, while having excellent properties such as light absorption and heat insulation, wide full-light dimming range and adjustable color.

[0061] 2. The PDLC dimming film provided by this invention has a haze of less than 2.5% in the on state and a haze of more than 95% in the off state at 48V, and a contrast ratio of more than 4. Detailed Implementation

[0062] To better understand the above-mentioned objectives, features, and advantages of the present invention, the solutions of the present invention will be further described below. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0063] Many specific details are set forth in the following description in order to provide a full understanding of the invention, but the invention may also be practiced in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the invention, and not all embodiments.

[0064] Examples 1-6

[0065] This embodiment provides a dye PDLC composition, the composition of which is shown in Table 1:

[0066] Table 1

[0067] The compositions of the liquid crystal compositions in Examples 1-4 are shown in Table 2:

[0068] Table 2

[0069] The compositions of the liquid crystal compositions in Examples 5-6 are shown in Table 3:

[0070] Table 3

[0071] Tests revealed that the liquid crystal compositions provided in Examples 1 and 2 had a Cp of 117.8, a Δn of 0.239, and a Δε of 17.4; the liquid crystal compositions provided in Examples 3 and 4 had a Cp of 114.7, a Δn of 0.244, and a Δε of 14.6; and the liquid crystal compositions provided in Examples 5 and 6 had a Cp of 104.6, a Δn of 0.235, and a Δε of 14.8.

[0072] 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, wherein 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.

[0073] 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, with a mass ratio of 0.8:1.3:0.7:0.9:1.2.

[0074] The dichroic dyes described in Examples 5 and 6 are mixtures of compounds represented by formulas I-5, II-7, III-4, and IV-12, with a mass ratio of 1.2:0.9:1.3:2.2.

[0075] The composition of the reactive diluents described in Examples 1-6 is shown in Table 4:

[0076] Table 4

[0077] The oligomers described in Examples 1-6 are polyurethane acrylates with a spacer particle size of 20 μm; the photoinitiator is phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide.

[0078] Examples 7-8

[0079] This embodiment provides a PDLC composition. The composition of the dye PDLC composition is the same as that in 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), respectively, and the other components are reduced or increased proportionally.

[0080] Comparative Example 1

[0081] This comparative example provides a PDLC composition, the composition of which is the same as that of Example 1. The difference from Example 1 is that no dichroic dye is added in this comparative example.

[0082] Comparative Examples 2-3

[0083] This comparative example provides a PDLC composition, the composition of which is the same as that of Example 1. The difference from Example 1 is that the content of anthraquinone dichroic dye in this comparative example is 1% (Comparative Example 2) and 10% (Comparative Example 3), and the other components are increased or decreased in the same proportion.

[0084] Application examples

[0085] PDLC dimming films were prepared using the PDLC compositions provided in the examples and comparative examples, and the preparation methods are as follows:

[0086] (1) After mixing the dichroic dye and the liquid crystal composition in the specified amount evenly, mixture A is obtained;

[0087] (2) After the reactive diluent and oligomer are mixed evenly, mixture B is obtained;

[0088] (3) Mix mixture A and mixture B at room temperature to obtain mixture C; add photoinitiator and spacer to mixture C and stir evenly at room temperature in the dark to obtain dye PDLC composition;

[0089] (4) The obtained dye PDLC composition is uniformly coated between two transparent substrates with an ITO conductive layer, and then cut and cured with ultraviolet light to obtain a PDLC dimming film.

[0090] Performance testing

[0091] (1) Apply a 60V, 50Hz sine wave to the dimming films prepared in the examples and comparative examples to test the haze and transmittance in the switching state, calculate the contrast of the film, and observe the changes in the appearance of the samples.

[0092] The test results are shown in Table 5:

[0093] Table 5

[0094] Table 5 shows that the PDLC dimming film prepared using the dye PDLC composition provided by this invention has a high off-state haze of over 95%, and a low haze of less than 2.5% when powered at 48V. It also exhibits a low driving voltage and a contrast ratio greater than 4. A comparison between Example 1 and Comparative Example 1 reveals that the contrast ratio of the dimming film is low (1.3) when the dichroic dye of this invention is not added. A comparison between Example 1 and Comparative Example 2 shows that when too little dichroic dye is added, the contrast improvement effect is poor; when too much dichroic dye is added, although the contrast ratio increases, the solubility decreases, resulting in poor uniformity of the prepared PDLC film.

[0095] (2) Color difference analysis was performed on the dimming films prepared in the examples and comparative examples. The method was as follows: the dye PDLC composition was coated onto two transparent substrates with ITO conductive layers using a coating machine. Before UV curing, the L*, a*, and b* values ​​of the samples were tested and recorded as L0*, a0*, and b0*. After UV curing, the L*, a*, and b* values ​​of the film were measured again and recorded as L1*, a1*, and b1*. The values ​​of ΔL*, Δa*, and Δb* were further calculated, where: ΔL*=L0*-L1*; Δa*=a0*-a1*; Δb*=b0*-b1*.

[0096] Calculate the total color difference value ΔE using the following formula: ΔE=[(ΔL*) 2 +(Δa*) 2 +(Δb*) 2 ] 1 / 2 ;

[0097] When ΔE < 2, it is generally imperceptible to the human eye, thus meeting the requirements for color difference change.

[0098] The results are shown in Table 6:

[0099] Table 6

[0100] Tables 5 and 6 show that the PDLC dimming film prepared using the dye PDLC composition provided by the present invention has low on-state haze, high off-state haze, and high contrast. Furthermore, the color change is minimal after UV curing. This indicates that the PDLC dimming film prepared by the present invention has high contrast, good optical performance, and good light stability.

[0101] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0102] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily 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 invention. Therefore, the present invention is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dye PDLC composition, characterized in that, Based on the total weight of the dye PDLC composition as 100%, the dye PDLC composition comprises the following components by weight percentage: The polymer precursor comprises oligomers and reactive diluents in a mass ratio of 1:(2-7).

2. The dye PDLC composition according to claim 1, characterized in that, The anthraquinone-type dichroic dyes include any one or more of the following: dichroic dyes with the structure shown in Formula I, dichroic dyes with the structure shown in Formula II, dichroic dyes with the structure shown in Formula III, or dichroic dyes with the 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 straight-chain or branched alkyl, alkenyl, alkoxy, enalkoxy, alkyl carbonyl, alkoxy carbonyl, alkyl carbonyloxy, or alkoxy carbonyloxy groups with 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 with 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 dyes with the structure shown in Formula II include any one or more of the compounds shown in Formulas II-1 to II-16: And / or, the dichroic dyes with the structure shown in Formula III include any one or more of the compounds shown in Formulas III-1 to III-10: And / or, the dichroic dyes with the structure shown in Formula IV include 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 1-3, characterized in that, The liquid crystal composition comprises any one or more compounds with the structure shown in Formula V: Among them, R 11 Selected from C1 to C 12 Straight-chain alkyl groups, C1-C 12 Straight-chain alkoxy or C2-C 12 Any one or more of the straight-chain alkenyl groups; A9 is selected from benzene rings and / or cyclohexane rings; 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 not both 0 at the same time; Preferably, the compound with 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 1-4, characterized in that, The liquid crystal composition comprises any one or more compounds with the structure shown in Formula VI: Among them, R 12 Selected from C1 to C 12 Straight-chain alkyl groups, C1-C 12 Straight-chain alkoxy or C2-C 12 Z5 and Z6 are each independently selected from any one or more of the straight-chain alkenyl groups, namely -CH2CH2-, -CH=CH-, -CF2O-, -OCF2-, -CH2O-, -OCH2-, -CO-O-, -O-CO-, -C2F4-, -CF=CF-, -CH=CH-CH2O- or CC single bonds; 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 simultaneously 0 or 1; Preferably, the compound with the structure shown in Formula VI includes any one or more of the compounds shown in Formulas VI1 to VI30:

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

7. The dye PDLC composition according to any one of claims 1-6, characterized in that, The liquid crystal composition comprises any one or more compounds with the structure shown in Formula VIII: Among them, R 15 and R 16 Each is independently selected from C1 to C2. 12 Straight-chain alkyl groups, 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; Preferably, the compound with the structure shown in Formula VIII includes any one or more of the compounds shown in Formulas VIII1 to VIII18:

8. The dye PDLC composition according to any one of claims 1-7, characterized in that, The number-average molecular weight of the oligomer is 300-800; And / or, the oligomers include any one or more of polyurethane acrylates, epoxy acrylates, acrylic prepolymers, polyester acrylates, polyether acrylates, polybutadiene acrylates, and polyamides; And / or, the reactive 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, dodecyl 2-acrylate, 1,6-hexanediol diacrylate, trimethylolpropane triacrylate, isobornyl acrylate, isobornyl methacrylate, hydroxybicyclopentene, dicyclopentenyl acrylate, or N-acryloylmorpholine.

9. The dye PDLC composition according to any one of claims 1-8, characterized in that, The photoinitiator is selected from any one or more of benzoin and its ether photoinitiators, benzoyldialkyl 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 1-9.

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