Dye-PDLC composition and PDLC dimming film

Abstract

The present disclosure relates to the technical field of dimming films, and in particular to a dye-PDLC composition and a PDLC dimming film. In the present disclosure, a variety of specific dichroic dyes are selected, and by adjusting the ratio of the dyes and the addition ratio of other components, the dichroic dyes used are not prone to precipitation or fading during the preparation of the PDCL dimming film, thus enabling the resulting PDLC light dimming film to have a high off-state haze and a high contrast. Furthermore, the selected dichroic dyes will absorb part of the scattered light, thereby further reducing the on-state haze. Moreover, the use of the composition of the present disclosure to prepare a PDCL dimming film can also greatly increase the full light modulation range of the dimming film, and meet the requirements for the optical modulation range of the dimming films in the art.

Description

A dye PDLC composition and a PDLC dimming film

[0001] Cross-references

[0002] This application claims priority to Chinese Patent Application No. 202411574509.7, 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 disclosure relates to the field of dimming film technology, and in particular to a dye PDLC composition and a PDLC dimming film. Background Technology

[0004] With the continuous expansion of applications in automobiles, architecture, and outdoor settings, the use of dimming glass films is increasing. Currently, there are three commonly used dimming canopies on the market. The first is EC (electrochromic) dimming film, but it has not been widely used due to its extremely slow dimming speed and the problem of dark blue windows. The second is SPD (suspended particle) dimming film, which has serious problems such as slow dimming response speed, high voltage (110V) risk of electric shock, dark blue color, and high haze. It is also expensive and cannot be promoted on a large scale. The third is PDLC dimming film. When the dimming film is de-energized (OFF), the polymer liquid crystal material in the middle is in a disordered state, blocking light from passing through the film. The effect seen at this time is a milky white opaque state. When the dimming film is energized (ON), the polymer liquid crystal material in the middle of the film is arranged in an orderly manner under the action of the electric field, allowing light to pass through the film.

[0005] However, PDLC films on their own have a single color, while adding dyes to PDLCs allows for multi-color tunable switching of dimming glass. Dyes are molecules with dichroism, exhibiting different colors due to varying absorbance along their long and short axes, thus enabling the switching between bright and dark states of the PDLC film. However, high-performance dye-treated PDLCs (on-state haze less than 4%; off-state haze greater than 94%) have not yet been successfully fabricated, thus limiting their applications.

[0006] Therefore, how to provide a dye PDLC with high performance (on-state haze less than 4%; off-state haze greater than 94%) is a problem that urgently needs to be solved. Summary of the Invention

[0007] To address the aforementioned technical issues, this disclosure provides a dye PDLC composition and a PDLC dimming film. By adding two different dichroic molecules, this disclosure effectively improves the performance of the PDLC dimming film and broadens its application scenarios.

[0008] In a first aspect, this disclosure provides a dye PDLC composition comprising, by weight percentage:

[0009] The dichroic dyes include anthraquinone dichroic dyes and azo dichroic dyes in a mass ratio of 1:(2-5).

[0010] The polymer precursor comprises a prepolymer and a diluent in a mass ratio of 1:(2-6).

[0011] This disclosure selects a variety of specific dichroic dyes and, by adjusting their ratios and the addition ratios of other components, makes it difficult for the selected dichroic dyes to precipitate or fade during the preparation of the PDCL dimming film. This results in a PDCL dimming film with high off-state haze and high contrast. Furthermore, the selected dichroic dyes absorb some of the scattered light, thereby further reducing the on-state haze. In addition, using the composition disclosed in this disclosure to prepare the PDCL dimming film can significantly improve the full-light dimming range of the dimming film, meeting the requirements of the art for the dimming range of dimming films.

[0012] For dye PDLC compositions, the content of the liquid crystal component can be selected as 30%, 40%, 50%, 60% or 70%, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0013] The content of dichroic dyes can be selected as 3%, 4%, 5%, 6% or 7%, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0014] The content of the polymer precursor can be selected as 25%, 30%, 35%, 37%, 40%, 42%, 45%, 50%, 55%, 60% or 65%, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0015] The content of photoinitiator can be selected as 0.5%, 1.0%, 1.5%, 2.0%, or 2.5%, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0016] The content of spacer particles can be selected as 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, or 0.8%, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0017] The mass ratio of the anthraquinone dichroic dye and the azo dichroic dye can be selected as 1:2, 1:3, 1:4 or 1:5, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0018] The mass ratio of the prepolymer to the diluent can be selected as 1:2, 1:3, 1:4, 1:5 or 1:6, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0019] The following are preferred technical solutions of this disclosure, but are not intended to limit the technical solutions provided by this disclosure. The technical objectives and beneficial effects of this disclosure can be better achieved through the following technical solutions.

[0020] As a preferred technical solution of this disclosure, the anthraquinone-type dichroic dye includes one or more compounds represented by general formula I;

[0021] R1-R2 each independently represent any one of the following: straight-chain or branched alkyl, alkenyl, alkoxy, enalkoxy, alkyl carbonyl, alkoxy carbonyl, alkyl carbonyloxy, or alkoxy carbonyloxy, consisting of 1-7 carbon atoms.

[0022] A1 and A2 are each selected independently. Any one of them.

[0023] Preferably, the compound represented by general formula I is selected from one or more compounds represented by IA1-IA3 or IB1-IB3;

[0024] As a preferred technical solution of this disclosure, the azo dichroic dye includes:

[0025] At least one compound represented by general formula II;

[0026] In at least one compound represented by general formula III;

[0027] and, at least one compound represented by general formula IV;

[0028] Among them, R3-R 10 Each of the following groups independently represents any one of the following: straight-chain or branched alkyl, alkenyl, alkoxy, enalkoxy, alkyl carbonyl, alkoxy carbonyl, alkyl carbonyloxy, or alkoxy carbonyloxy; a1-a2 and b1-b2 each independently represent 0, 1, or 2; Z1-Z4 each independently represent any one of the following: ester, cyclohexyl, phenyl, ester-phenyl, or phenylcyclohexyl.

[0029] Preferably, in the compounds represented by general formula II, the compounds represented by general formula III, and the compounds represented by general formula IV, R4, R5, R7, R8, and R... 10Each of R4, R5, R7, and R8 independently represents a substituent other than methyl, and more preferably, one or more of them represent ethyl groups. 10 It represents isobutyl or isopentyl.

[0030] Preferably, a1-a2 and b1-b2 each independently represent 0 or 1.

[0031] Preferably, Z2 and / or Z4 represent phenyl.

[0032] The mixing ratio of azo dichroic dyes can be selected according to the actual required color.

[0033] Preferably, the mass ratio of the compound represented by general formula II, the compound represented by general formula III, and the compound represented by general formula IV is (0.8-1.2):(0.8-1.2):(1.6-2.5), for example, 0.8:0.9:2.2, 0.9:0.8:2.1, 0.8:0.8:1.6, 0.8:1.0:1.7, 0.8:1.9:1.6, or 1.2:1.2:2.5, etc., but is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0034] As a preferred technical solution of this disclosure, the compound represented by general formula II is selected from one or more of the compounds represented by IIA1-IIA3 and IIB1-IIB3;

[0035] As a preferred technical solution of this disclosure, the compound represented by general formula III is selected from one or more of the compounds represented by IIIA1-IIIA3 and IIIB1-IIIB3;

[0036] As a preferred technical solution of this disclosure, the compound represented by general formula IV is selected from one or more compounds represented by IV1-IV6;

[0037] As a preferred technical solution of this disclosure, the liquid crystal composition includes a nematic liquid crystal composition;

[0038] Preferably, the nematic liquid crystal composition comprises at least one compound represented by general formula V, at least one compound represented by general formula VI, and at least one compound represented by general formula VII;

[0039] Among them, R 11A3 represents a straight-chain alkyl group with 1-12 carbon atoms, a straight-chain alkoxy group with 1-12 carbon atoms, or a straight-chain alkenyl group with 1-12 carbon atoms; A3 represents a benzene ring or cyclohexane; X1 and Y1 each independently represent H, F, or Cl; a3 and b3 each independently represent 0 or 1, and not both simultaneously 0.

[0040] Among them, R 12 Z5 represents a straight-chain alkyl group, a straight-chain alkoxy group, or a straight-chain alkenyl group with 1-12 carbon atoms; Z6 and Z6 each independently represent -CH2CH2-, CH=CH-, -CF2O-, -OCF2-, -CH2O-, -OCH2-, -CO-O-, -O-CO-, -C2F4-, -CF=CF-, or -CH=CH-CH2O-; X2 represents H, F, or Cl; a4, b4, and c1 each independently represent 0 or 1, and a4 and b4 are not simultaneously 0 or 1.

[0041] Among them, R 13 and R 14 Each of the following can independently represent a straight-chain alkyl group with 1-12 carbon atoms, a straight-chain alkoxy group with 1-12 carbon atoms, or a straight-chain alkenyl group with 1-12 carbon atoms.

[0042] As a preferred technical solution of this disclosure, the compound represented by general formula V is selected from one or more of the compounds represented by VA1-VA7, VB1-VB3, VC1-VC5, VD1-VD3, VE1-VE5, VF1-VF5, VG1-VG5, VH1-VH5, VI1-VI5 or VJ1-VJ5.

[0043] Preferably, the compound represented by general formula V is selected from one or more of VA2-VA6, VC2-VC5, VE2-VE5, VF2-VF5, VG2-VG5 or VH2-VH5.

[0044] As a preferred technical solution of this disclosure, the compound represented by general formula VI is selected from one or more of the compounds represented by VIA1-VIA5, VIB1-VIB5, VIC1-VIC5, VID1-VID5, VIE1-VIE5 or VIF1-VIF5;

[0045] Preferably, the compound represented by the general formula VI is selected from one or more of VIA2-VIA5, VIC2-VIC5, VID2-VID5, or VIE2-VIE5.

[0046] As a preferred technical solution of this disclosure, the compound represented by general formula VII is selected from one or more compounds represented by VIIA1-VIIA20;

[0047] Preferably, the compound represented by general formula VII is selected from one or more of VIIA3, VIIA13, VIIA15 or VIIA20.

[0048] As a preferred technical solution of this disclosure, the prepolymer includes one or more of polyurethane acrylate, epoxy acrylate, acrylic prepolymer, polyester acrylate, polyether acrylate, polybutadiene acrylate, or polyamide.

[0049] As a preferred technical solution of this disclosure, the diluent includes one or more of the following: 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.

[0050] As a preferred technical solution of this disclosure, the photoinitiator includes one or more of benzoin and its ethers, benzoyl dialkyl ketals, aromatic ketones, oxime esters, thioxanthones, or phosphine oxides, preferably one or more of aromatic ketones, oxime esters, or phosphine oxides.

[0051] Preferably, the photoinitiator comprises one or more of 2-hydroxy-2-methyl-1-phenyl-1-propanone, 2-benzyl-2-dimethylamino-1-(4-morpholinylphenyl)-1-butanone, 1-hydroxycyclohexyl-phenyl ketone, 2,2-dimethoxy-2-phenylacetophenone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide, 2-isopropylthioxanthonone, 2,4-diethylthioxanthonone, tetraethylmiel's ketone, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, or OXE-01.

[0052] As a preferred technical solution of this disclosure, the spacer particles include silicon sphere spacers and / or plastic sphere spacers.

[0053] As a preferred technical solution of this disclosure, the particle size of the spacer particles is 10-30μm, such as 10μm, 15μm, 20μm, 25μm or 30μm, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable, with 10-20μm being the preferred size.

[0054] In a second aspect, this disclosure provides a PDLC dimming film prepared using the dye PDLC composition as described in the first aspect.

[0055] This disclosure obtains a PDLC dimming film with high off-state haze, low on-state haze, and high contrast by controlling the liquid crystal composition, the type and content of dichroic dyes, the addition ratio of polymer monomers, and the type and content of photoinitiators.

[0056] As a preferred technical solution of this disclosure, the PDLC dimming film has a haze of >94% in the off state, such as 95%, 96%, 97%, 98%, or 99%; a haze of <4% when powered on at 60V, such as 1%, 2%, or 3%; and a contrast ratio greater than 8, such as 9, 10, 11, or 12, but is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0057] The technical solution provided in this disclosure has the following advantages compared with the prior art:

[0058] (1) This disclosure selects a variety of specific dichroic dyes and adjusts their ratio and the addition ratio of other components to make the selected dichroic dyes less likely to precipitate and fade during the preparation of PDCL dimming film, thereby making the obtained PDLC dimming film have high off-state haze and high contrast. In addition, the selected dichroic dyes will absorb some of the scattered light, thereby further reducing the on-state haze.

[0059] (2) This disclosure significantly improves the full-light dimming range of the dimming film by selecting two specific dichroic dyes, thereby meeting the requirements of the art for the dimming range of the dimming film.

[0060] (3) The dimming film prepared using the dye PDLC composition disclosed herein can be customized into monochrome colors such as black, yellow, red, purple or blue according to actual needs, to meet the visual requirements of buildings, automobiles, high-speed rail and airplanes. Detailed Implementation

[0061] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0062] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure, but this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of this disclosure.

[0063] Examples 1-10 of this disclosure provide a dye PDLC composition, the content of each component is expressed as a mass percentage, and the specific content is shown in Table 1.

[0064] Table 1

[0065] Table 1 shows the specific composition and content of the liquid crystal components in each embodiment, as shown in Table 2. The total liquid crystal component content is assumed to be 100%.

[0066] Table 2

[0067] Table 1 shows the specific composition of the anthraquinone-type dichroic dyes and azo-type dichroic dyes in each embodiment, as well as the mass ratio of each component. Table 3 shows the mass ratio of each component.

[0068] Table 3

[0069] In Table 1, polyurethane acrylate was selected as the prepolymer in each embodiment.

[0070] Table 1 shows the specific composition of the diluent in each embodiment, and the content of each component in the dye PDLC composition is shown in Table 4.

[0071] Table 4

[0072] In Table 1, the photoinitiator in each embodiment was phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide.

[0073] In Table 1, the spacer particles in each embodiment are all silicon spheres with a particle size of 20 μm.

[0074] Comparative Example 1

[0075] This comparative example provides a dye PDLC composition, which is the same as the dye PDLC composition in Example 3, except that: no azo dichroic dye is added, and the missing mass is made up by anthraquinone dichroic dye.

[0076] Comparative Example 2

[0077] This comparative example provides a dye PDLC composition, which is the same as the dye PDLC composition in Example 3, except that: no anthraquinone dichroic dye is added, and the missing mass is made up by azo dichroic dye in proportion.

[0078] Comparative Example 3

[0079] This comparative example provides a dye PDLC composition, which is the same as the dye PDLC composition in Example 3, except that the mass ratio of IB3: IIB2: IIIB2: IV1 in Table 3 is 3.8:0.9:0.8:2.1.

[0080] Application examples

[0081] PDLC dimming films were prepared using the dye PDLC compositions obtained in Examples 1-10 and Comparative Examples 1-3, respectively. The preparation method of the PDLC dimming film includes:

[0082] Anthraquinone-type dichroic dyes and azo-type dichroic dyes are mixed with liquid crystal components to obtain the first mixture;

[0083] The prepolymer is mixed with a diluent to obtain a second mixture;

[0084] The first mixture is mixed with the second mixture to obtain the third mixture;

[0085] The third mixture is mixed with a photoinitiator and spacer particles to obtain a dye PDLC composition;

[0086] The obtained dye PDLC composition was uniformly coated between two layers of transparent ITO conductive film, and then successively cut and cured under ultraviolet light (80mw / cm). 2 PDLC dimming film was obtained at 80s.

[0087] Performance testing:

[0088] (a) Apply a 60V, 50Hz sine wave to the PDLC dimming films prepared in Examples 1-10 and Comparative Examples 1-3, 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. The test results are shown in Table 5.

[0089] Table 5

[0090] (II) Color difference analysis was performed on the PDLC dimming films prepared in Examples 1-10 and Comparative Examples 1-3, respectively. The method was as follows: the PDLC composition of the dye to be tested was uniformly coated between two layers of transparent conductive film using a coating machine to obtain a sample; before UV curing, the L*, a*, and b* values ​​of the sample were measured and recorded as L0*, a0*, and b0*; after UV curing, the L*, a*, and b* values ​​of the sample were measured again and recorded as L1*, a1*, and b1*, and the values ​​of ΔL*, Δa*, and Δb* were further calculated, where: ΔL*=L0*-L1*; Δa*=a0*-a1*; Δb*=b0*-b1*;

[0091] Calculate the total color difference value ΔE using the following formula: ΔE=[(ΔL*) 2 +(Δa*) 2 +(Δb*) 2 ] 1 / 2

[0092] The data results are shown in Table 6.

[0093] Table 6

[0094] When ΔE < 2, it is generally imperceptible to the human eye, thus meeting the requirements for color difference change.

[0095] Through the above tests on the film, this disclosure found that the PDLC dimming film obtained in Examples 1-10 has low on-state haze (haze <4% at 60V), high off-state haze (>94%), and high contrast (>8); and after UV curing, the color change is relatively small. This indicates that the PDLC dimming film prepared using the dye PDLC composition of this disclosure has high contrast, good optical performance, and good light stability.

[0096] Comparative Example 1 contained only anthraquinone dichroic dyes, resulting in low contrast of the PDLC dimming film; Comparative Example 2 contained only azo dichroic dyes, resulting in poor lightfastness, and when only azo compounds were used, a gray-black PDLC film could not be obtained; In Comparative Example 3, the anthraquinone dichroic dyes were not added within the appropriate proportion range, which also resulted in low contrast of the obtained PDLC dimming film, and a gray-black PDLC film could not be obtained.

[0097] 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.

[0098] The above description is merely a specific embodiment of this disclosure, enabling those skilled in the art to understand or implement it. 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 this disclosure. Therefore, this disclosure 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, By weight percentage, it includes: The dichroic dyes include anthraquinone dichroic dyes and azo dichroic dyes in a mass ratio of 1:(2-5). The polymer precursor comprises a prepolymer and a diluent in a mass ratio of 1:(2-6).

2. The dye PDLC composition according to claim 1, characterized in that, The anthraquinone dichroic dyes include one or more compounds represented by general formula I; R1-R2 each independently represent any one of the following: straight-chain or branched alkyl, alkenyl, alkoxy, enalkoxy, alkyl carbonyl, alkoxy carbonyl, alkyl carbonyloxy, or alkoxy carbonyloxy, consisting of 1-7 carbon atoms. A1 and A2 are each selected independently. Any one of them; Preferably, the compound represented by general formula I is selected from one or more compounds represented by IA1-IA3 or IB1-IB3; 3. The dye PDLC composition according to claim 1, characterized in that, The azo dichroic dyes include: At least one compound represented by general formula II; At least one compound represented by general formula III; and, at least one compound represented by general formula IV; Among them, R3-R 10 Each of the following groups independently represents any one of the following: straight-chain or branched alkyl, alkenyl, alkoxy, enalkoxy, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy, or alkoxycarbonyloxy, consisting of 1 to 7 carbon atoms; a1-a2 and b1-b2 each independently represent 0, 1, or 2; Z1-Z4 each independently represent any one of the following: ester, cyclohexyl, phenyl, ester-phenyl, or phenylcyclohexyl. Preferably, in the compounds represented by general formula II, the compounds represented by general formula III, and the compounds represented by general formula IV, R4, R5, R7, R8, and R... 10 Each of R4, R5, R7, and R8 independently represents a substituent other than methyl, and more preferably, one or more of them represent ethyl groups. 10 Represents isobutyl or isopentyl; Preferably, a1-a2 and b1-b2 each independently represent 0 or 1; Preferably, Z2 and / or Z4 represent phenyl.

4. The dye PDLC composition according to claim 3, characterized in that, The compounds represented by general formula II are selected from one or more of the compounds represented by IIA1-IIA3 and IIB1-IIB3; 5. The dye PDLC composition according to claim 3 or 4, characterized in that, The compounds represented by general formula III are selected from one or more of the compounds represented by IIIA1-IIIA3 and IIIB1-IIIB3; 6. The dye PDLC composition according to any one of claims 3-5, characterized in that, The compound represented by general formula IV is selected from one or more compounds represented by IV1-IV6; 7. The dye PDLC composition according to any one of claims 1-6, characterized in that, The liquid crystal composition includes a nematic liquid crystal composition; Preferably, the nematic liquid crystal composition comprises at least one compound represented by general formula V, at least one compound represented by general formula VI, and at least one compound represented by general formula VII; Among them, R 11 A3 represents a straight-chain alkyl group with 1-12 carbon atoms, a straight-chain alkoxy group with 1-12 carbon atoms, or a straight-chain alkenyl group with 1-12 carbon atoms; A3 represents a benzene ring or cyclohexane; X1 and Y1 each independently represent H, F, or Cl; a3 and b3 each independently represent 0 or 1, and not both simultaneously 0. Among them, R 12 Z5 represents a straight-chain alkyl group, a straight-chain alkoxy group, or a straight-chain alkenyl group with 1-12 carbon atoms; Z6 and Z6 each independently represent -CH2CH2-, CH=CH-, -CF2O-, -OCF2-, -CH2O-, -OCH2-, -CO-O-, -O-CO-, -C2F4-, -CF=CF-, or -CH=CH-CH2O-; X2 represents H, F, or Cl; a4, b4, and c1 each independently represent 0 or 1, and a4 and b4 are not simultaneously 0 or 1. Among them, R 13 and R 14 Each of the following can independently represent a straight-chain alkyl group with 1-12 carbon atoms, a straight-chain alkoxy group with 1-12 carbon atoms, or a straight-chain alkenyl group with 1-12 carbon atoms; Preferably, the compound represented by general formula V is selected from one or more compounds represented by VA1-VA7, VB1-VB3, VC1-VC5, VD1-VD3, VE1-VE5, VF1-VF5, VG1-VG5, VH1-VH5, VI1-VI5, or VJ1-VJ5. Preferably, the compound represented by general formula VI is selected from one or more compounds represented by VIA1-VIA5, VIB1-VIB5, VIC1-VIC5, VID1-VID5, VIE1-VIE5, or VIF1-VIF5; Preferably, the compound represented by general formula VII is selected from one or more compounds represented by VIIA1-VIIA20; 8. The dye PDLC composition according to any one of claims 1-7, characterized in that, The prepolymer includes one or more of polyurethane acrylate, epoxy acrylate, acrylic prepolymer, polyester acrylate, polyether acrylate, polybutadiene acrylate, or polyamide; Preferably, the diluent comprises one or more of the following: 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; Preferably, the photoinitiator comprises one or more of benzoin and its ethers, benzoyl dialkyl ketals, aromatic ketals, oxime esters, thioxanthones, or phosphine oxides, and more preferably one or more of aromatic ketals, oxime esters, or phosphine oxides; Preferably, the spacer particles include silicon sphere spacers and / or plastic sphere spacers; Preferably, the particle size of the spacer particles is 10-30 μm, and more preferably 10-20 μm.

9. A PDLC dimming film, characterized in that, It is prepared using the dye PDLC composition as described in any one of claims 1-8.

10. The PDLC dimming film according to claim 9, characterized in that, The PDLC dimming film has a haze of >94% when off, a haze of <4% when powered on at 60V, and a contrast ratio of >8.

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