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. According to the present invention, a plurality of specific dichroic dyes are selected, and by regulating the ratio of the specific dichroic dyes and the addition ratio of other components, the selected dichroic dyes are not easy to separate out and not easy to fade during the PDLC light adjusting film preparation process, such that the obtained PDLC light adjusting film has high off-state haze and high contrast, and the PDLC light adjusting film has characteristics of high brightness and high brightness. The selected dichroic dye can absorb part of scattered light, so that the on-state haze is further reduced; in addition, by adopting the composition disclosed by the invention to prepare the PDCP light adjusting film, the all-light light adjusting range of the light adjusting film can be greatly improved, and the requirement of the field on the light adjusting range of the light adjusting film is met.

Description

Technical Field

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

[0002] With the continuous expansion of scenes such as automobiles, buildings and outdoor, the application of dimming glass film is increasing. There are three types of dimming skylights commonly used in the market. The first is EC (electrochromic) dimming film, but due to its ultra-slow dimming speed and dark blue window problems, it has not been widely used; the second is SPD (suspended particle) dimming film, which has serious problems such as slow dimming response speed, 110V high voltage electric shock risk, dark blue color and high haze, and high cost, and cannot be promoted on a large scale; the third is PDLC dimming film. When the dimming film is powered off (OFF), the polymer liquid crystal material in the middle is in a disordered state, blocking light from penetrating the film. The effect seen at this time is a milky white opaque state; when the dimming film is powered on (ON), the polymer liquid crystal material in the middle of the film is orderly arranged under the action of the electric field, allowing light to pass through the film.

[0003] However, the color of pure PDLC film is single, and adding dyes to PDLC can make the color of dimming glass multi-color adjustable. Dyes refer to molecules with dichroic properties, which have different absorbances along the long and short axes of the molecules and show different colors, further realizing the switching of the PDLC film between the bright state and the dark state. However, dye PDLC with high performance (haze of the on state is less than 4%; haze of the off state is greater than 94%) has not been successfully prepared, which limits its application.

[0004] Therefore, how to provide a dye PDLC with high performance (on-state haze less than 4%; off-state haze greater than 94%) has become a problem that needs to be solved urgently. Summary of the invention

[0005] In order to solve the above technical problems, the present disclosure provides a dye PDLC composition and a PDLC dimming film. The present disclosure effectively improves the performance of the PDLC dimming film and broadens its application scenarios by adding two different dichroic molecules.

[0006] In a first aspect, the present disclosure provides a dye PDLC composition, comprising, by weight percentage:

[0007]

[0008] Wherein, the dichroic dye comprises anthraquinone-type dichroic dye and an azo-type dichroic dye in a mass ratio of 1:(2-5);

[0009] The polymer precursor comprises a prepolymer and a diluent in a mass ratio of 1:(2-6).

[0010] The present invention selects a variety of specific dichroic dyes, and by adjusting their ratios and the addition ratios of other components, the selected dichroic dyes are not easy to precipitate and fade during the preparation of the PDCL dimming film, so that the obtained PDLC dimming film has a higher off-state haze and a higher contrast, and the selected dichroic dyes will absorb part of the scattered light, thereby further reducing the on-state haze; in addition, the use of the composition disclosed in the present invention to prepare the PDCL dimming film can also greatly improve the full-light dimming range of the dimming film, meeting the requirements of the dimming range of the dimming film in the field.

[0011] For the dye PDLC composition, the content of the liquid crystal component is selected as 30%, 40%, 50%, 60% or 70%, etc., but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0012] The content of the dichroic dye may be selected as 3%, 4%, 5%, 6% or 7%, etc., but is not limited to the listed values, and other values ​​not listed within the range are also applicable.

[0013] The content of the polymer precursor can be selected as 25%, 30%, 35%, 37%, 40%, 42%, 45%, 50%, 55%, 60% or 65%, but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0014] The content of the photoinitiator can be selected as 0.5%, 1.0%, 1.5%, 2.0% or 2.5%, etc., but is not limited to the listed values, and other values ​​not listed within the range are also applicable.

[0015] The content of the spacer particles can be selected from 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7% or 0.8%, etc., but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0016] The mass ratio of the anthraquinone dichroic dye and the azo dichroic dye is selected, for example, 1:2, 1:3, 1:4 or 1:5, but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0017] The mass ratio of the prepolymer to the diluent may be 1:2, 1:3, 1:4, 1:5 or 1:6, etc., but is not limited to the listed values, and other values ​​not listed within the range are also applicable.

[0018] The following are preferred technical solutions of the present disclosure, but are not intended to be limitations of the technical solutions provided by the present disclosure. Through the following technical solutions, the technical objectives and beneficial effects of the present disclosure can be better achieved and realized.

[0019] As a preferred technical solution of the present disclosure, the anthraquinone-type dichroic dye includes one or more compounds shown in general formula I;

[0020]

[0021] wherein R1-R2 each independently represent any one of a straight chain or branched chain alkyl, alkenyl, alkoxy, alkenyloxy, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy or alkoxycarbonyloxy group having 1 to 7 carbon atoms;

[0022] A1 and A2 are each independently selected from

[0023] Any one of .

[0024] Preferably, the compound represented by the general formula I is selected from one or more of the compounds represented by IA1-IA3 or IB1-IB3;

[0025]

[0026]

[0027] As a preferred technical solution of the present disclosure, the azo dichroic dye comprises:

[0028] At least one compound represented by the general formula II;

[0029] At least one compound represented by the general formula III;

[0030] and, at least one compound of formula IV;

[0031]

[0032] Among them, R3-R 10 Each independently represents any one of a straight chain or branched alkyl, alkenyl, alkoxy, alkenyloxy, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy or alkoxycarbonyloxy group having 1 to 7 carbon atoms; a1-a2, b1-b2 each independently represent 0, 1 or 2; Z1-Z4 each independently represents any one of an ester group, cyclohexyl, phenyl, esterphenyl or phenylcyclohexyl group.

[0033] Preferably, in the compound represented by the general formula II, the compound represented by the general formula III and the compound represented by the general formula IV, R4, R5, R7, R8 and R 10 Each independently represents a substituent other than a methyl group. More preferably, one or more of R4, R5, R7 and R8 represents an ethyl group. 10 represents isobutyl or isopentyl.

[0034] Preferably, a1-a2 and b1-b2 each independently represent 0 or 1.

[0035] Preferably, Z2 and / or Z4 represent phenyl.

[0036] The mixing ratio of the azo dichroic dye can be selected according to the actual desired color.

[0037] Preferably, the mass ratio of the compound represented by the general formula II, the compound represented by the general formula III and the compound represented by the 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 the range are also applicable.

[0038] As a preferred technical solution of the present disclosure, the compound represented by the general formula II is selected from one or more of the compounds represented by IIA1-IIA3 and IIB1-IIB3;

[0039]

[0040] As a preferred technical solution of the present disclosure, the compound represented by the general formula III is selected from one or more of the compounds represented by IIIA1-IIIA3 or IIIB1-IIIB3;

[0041]

[0042]

[0043] As a preferred technical solution of the present disclosure, the compound represented by the general formula IV is selected from one or more of the compounds represented by IV1-IV6;

[0044]

[0045] As a preferred technical solution of the present disclosure, the liquid crystal composition includes a nematic liquid crystal composition;

[0046] 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;

[0047]

[0048] Among them, R 11 represents a straight-chain alkyl group of 1 to 12 carbon atoms, a straight-chain alkoxy group of 1 to 12 carbon atoms, or a straight-chain alkenyl group of 1 to 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 are not 0 at the same time;

[0049]

[0050] Among them, R 12 represents a straight-chain alkyl group of 1-12 carbon atoms, a straight-chain alkoxy group of 1-12 carbon atoms, or a straight-chain alkenyl group of 1-12 carbon atoms; Z5 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 0 or 1 at the same time;

[0051]

[0052] Among them, R 13 and R 14 Each independently represents a straight-chain alkyl group having 1 to 12 carbon atoms, a straight-chain alkoxy group having 1 to 12 carbon atoms, or a straight-chain alkenyl group having 1 to 12 carbon atoms.

[0053] As a preferred technical solution of the present disclosure, the compound represented by the 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;

[0054]

[0055]

[0056]

[0057] Preferably, the compound represented by the general formula V is selected from one or more of VA2-VA6, VC2-VC5, VE2-VE5, VF2-VF5, VG2-VG5 or VH2-VH5.

[0058] As a preferred technical solution of the present disclosure, the compound represented by the 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;

[0059]

[0060]

[0061] 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.

[0062] As a preferred technical solution of the present disclosure, the compound represented by the general formula VII is selected from one or more of the compounds represented by VIIA1-VIIA20;

[0063]

[0064] Preferably, the compound represented by the general formula VII is selected from one or more of VIIA3, VIIA13, VIIA15 or VIIA20.

[0065] As a preferred technical solution of the present disclosure, the prepolymer includes one or more of polyurethane acrylate, epoxy acrylate, acrylic prepolymer, polyester acrylate, polyether acrylate, polybutadiene acrylate or polyamide.

[0066] As a preferred technical solution of the present invention, the diluent includes 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.

[0067] As a preferred technical solution of the present disclosure, the photoinitiator includes one or more of benzoin and its ethers, benzil dialkyl ketals, aromatic ketones, oxime esters, thioxanthones or phosphine oxides, preferably one or more of aromatic ketones, oxime esters or phosphine oxides.

[0068] Preferably, the photoinitiator includes 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, di(2,4,6-trimethylbenzoyl)-phenylphosphine oxide, 2-isopropylthioxanthone, 2,4-diethylthioxanthone, tetraethyl Michler's ketone, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide or OXE-01.

[0069] As a preferred technical solution of the present disclosure, the spacer particles include silicon ball spacers and / or plastic ball spacers.

[0070] As a preferred technical solution of the present disclosure, the particle size of the spacer particles is 10-30μm, for example 10μm, 15μm, 20μm, 25μm or 30μm, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable, preferably 10-20μm.

[0071] In a second aspect, the present disclosure provides a PDLC dimming film prepared using the dye PDLC composition as described in the first aspect.

[0072] The present invention obtains a PDLC dimming film with higher off-state haze, lower on-state haze and higher contrast by controlling liquid crystal components, the type and content of dichroic dyes, the addition ratio of polymer monomers and the addition type and content of photoinitiators.

[0073] As a preferred technical solution disclosed in the present invention, the off-state haze of the PDLC dimming film is greater than 94%, such as 95%, 96%, 97%, 98% or 99%; the 60V powered haze is less than 4%, such as 1%, 2% or 3%; the contrast ratio is greater than 8, such as 9, 10, 11 or 12, but is not limited to the listed values, and other values ​​not listed within the above range are also applicable.

[0074] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0075] (1) The present invention selects a variety of specific dichroic dyes, and by adjusting their ratios and the addition ratios of other components, the selected dichroic dyes are not easy to precipitate and fade during the preparation of the PDCL dimming film, thereby making the obtained PDLC dimming film have a higher off-state haze and a higher contrast, and the selected dichroic dyes will absorb part of the scattered light, thereby further reducing the on-state haze;

[0076] (2) The present disclosure significantly improves the full light dimming range of the dimming film by selecting two specific dichroic dyes, meeting the requirements of the dimming range of the dimming film in the art;

[0077] (3) The dimming film prepared by using the dye PDLC composition disclosed in the present invention can be customized into a single color such as black, yellow, red, purple or blue according to actual needs to meet the visual requirements of buildings, cars, high-speed trains and airplanes. DETAILED DESCRIPTION

[0078] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0079] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure 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 disclosure, rather than all of the embodiments.

[0080] Examples 1-10 of the present disclosure respectively provide a dye PDLC composition, and the content of each component is expressed in mass percentage, and the specific content is shown in Table 1.

[0081] Table 1

[0082]

[0083]

[0084] In Table 1, the specific composition and content of the liquid crystal components in each embodiment are shown in Table 2, wherein the total amount of the liquid crystal components is 100%.

[0085] Table 2

[0086]

[0087]

[0088]

[0089] In Table 1, the specific compositions of the anthraquinone dichroic dye and the azo dichroic dye in each embodiment and the mass ratios of the compositions are shown in Table 3.

[0090] Table 3

[0091]

[0092]

[0093] In Table 1, the prepolymer in each example is polyurethane acrylate.

[0094] In Table 1, the specific composition of the diluent in each example and the content of each component in the dye PDLC composition are shown in Table 4.

[0095] Table 4

[0096]

[0097] In Table 1, the photoinitiator in each example is phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide.

[0098] In Table 1, the spacer particles in each embodiment are all silicon sphere spacers with a particle size of 20 μm.

[0099] Comparative Example 1

[0100] This comparative example provides a dye PDLC composition, which refers to the dye PDLC composition in Example 3, except that no azo dichroic dye is added, and the missing quality is supplemented by anthraquinone dichroic dye.

[0101] Comparative Example 2

[0102] This comparative example provides a dye PDLC composition, which refers to the dye PDLC composition in Example 3, except that no anthraquinone dichroic dye is added, and the missing mass is supplemented by an azo dichroic dye in proportion.

[0103] Comparative Example 3

[0104] This comparative example provides a dye PDLC composition, which refers to the dye PDLC composition in Example 3, except that in Table 3, the mass ratio of IB3:ⅡB2:ⅢB2:Ⅳ1 is 3.8:0.9:0.8:2.1.

[0105] Application Examples

[0106] The dye PDLC compositions obtained in the above examples 1-10 and comparative examples 1-3 are respectively used to prepare PDLC dimming films, and the preparation method of the PDLC dimming films comprises:

[0107] Mixing anthraquinone dichroic dye and an azo dichroic dye with a liquid crystal component to obtain a first mixed material;

[0108] mixing the prepolymer with a diluent to obtain a second mixed material;

[0109] Mixing the first mixed material with the second mixed material to obtain a third mixed material;

[0110] Mixing the third mixed material with the photoinitiator and the spacer particles to obtain a dye PDLC composition;

[0111] The obtained dye PDLC composition was uniformly coated between two layers of transparent ITO conductive films, and then cut and cured by UV light (80 mw / cm 2 , 80s) to obtain the PDLC dimming film.

[0112] Performance Test:

[0113] (I) A 60V, 50Hz sine wave was applied to the PDLC dimming films prepared in Examples 1-10 and Comparative Examples 1-3, and the haze and transmittance in the switching state were tested. The contrast of the films was calculated, and the changes in the appearance of the samples were observed. The test results are shown in Table 5.

[0114] Table 5

[0115]

[0116]

[0117] (II) The PDLC dimming films prepared in Examples 1-10 and Comparative Examples 1-3 were subjected to color difference analysis, respectively, by the following method: the dye PDLC composition to be tested was uniformly coated between two layers of transparent conductive films by a coating machine to obtain a sample; before UV curing, the L*, a*, and b* values ​​of the sample were measured, recorded as L0*, a0*, and b0*; after UV curing, the L*, a*, and b* values ​​of the sample were measured again, recorded as L1*, a1*, and b1*, and the ΔL*, Δa*, and Δb* values ​​were further calculated, wherein:

[0118] ΔL*=L0*-L1*;

[0119] Δa*=a0*-a1*;

[0120] Δb*=b0*-b1*;

[0121] Calculate the total color difference ΔE according to the following formula:

[0122] ΔE=[(ΔL*) 2 +(Δa*) 2 +(Δb*) 2 ] 1 / 2

[0123] The data results are shown in Table 6.

[0124] Table 6

[0125]

[0126]

[0127] When ΔE<2, the human eye cannot detect it, thus meeting the color difference change requirement.

[0128] Through the above tests on the films, the present disclosure found that the PDLC dimming films obtained in Examples 1-10 have lower on-state haze (60V powered haze <4%), higher off-state haze (>94%), and higher contrast (>8); and after UV curing, the color change is relatively small, which shows that the PDLC dimming film prepared using the dye PDLC composition disclosed in the present disclosure has high contrast, good optical properties and good light resistance stability.

[0129] Comparative Example 1 contains only anthraquinone-type dichroic dyes, resulting in a low contrast ratio of the PDLC dimming film; Comparative Example 2 contains only azo-type dichroic dyes, resulting in poor light resistance stability, and when only azo compounds are contained, a PDLC film with a gray-black appearance cannot be obtained; in Comparative Example 3, the anthraquinone-type dichroic dye is not added within an appropriate proportion range, which also results in a low contrast ratio of the obtained PDLC dimming film, and a PDLC film with a gray-black appearance cannot be obtained.

[0130] 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.

[0131] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. 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 disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dye PDLC composition, characterized in that: In terms of weight percentage, it includes: Wherein, the dichroic dye comprises anthraquinone-type dichroic dye and an azo-type dichroic dye 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-type dichroic dye comprises one or more compounds represented by general formula I; wherein R1-R2 each independently represent any one of a straight chain or branched chain alkyl, alkenyl, alkoxy, alkenyloxy, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy or alkoxycarbonyloxy group having 1 to 7 carbon atoms; A1 and A2 are each independently selected from Any of the following: Preferably, the compound represented by the general formula I is selected from one or more of the 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 the general formula II; At least one compound represented by the general formula III; and, at least one compound of formula IV; Among them, R3-R 10 Each independently represents any one of a straight chain or branched alkyl, alkenyl, alkoxy, alkenyloxy, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy or alkoxycarbonyloxy group having 1 to 7 carbon atoms; a1-a2 and b1-b2 each independently represent 0, 1 or 2; Z1-Z4 each independently represents any one of an ester group, a cyclohexyl group, a phenyl group, an ester phenyl group or a phenylcyclohexyl group; Preferably, in the compound represented by the general formula II, the compound represented by the general formula III and the compound represented by the general formula IV, R4, R5, R7, R8 and R 10 Each independently represents a substituent other than a methyl group. More preferably, one or more of R4, R5, R7 and R8 represents an ethyl group. 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 compound represented by the general formula II is 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 compound represented by the general formula III is selected from one or more of the compounds represented by IIIA1-IIIA3 or IIIB1-IIIB3; 6. The dye PDLC composition according to any one of claims 3 to 5, characterized in that: The compound represented by the general formula IV is selected from one or more of the compounds represented by IV1-IV6; 7. The dye PDLC composition according to any one of claims 1 to 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 represents a straight-chain alkyl group of 1 to 12 carbon atoms, a straight-chain alkoxy group of 1 to 12 carbon atoms, or a straight-chain alkenyl group of 1 to 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 are not 0 at the same time; Among them, R 12 represents a straight-chain alkyl group of 1-12 carbon atoms, a straight-chain alkoxy group of 1-12 carbon atoms, or a straight-chain alkenyl group of 1-12 carbon atoms; Z5 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 0 or 1 at the same time; Among them, R 13 and R 14 Each independently represents a straight-chain alkyl group having 1 to 12 carbon atoms, a straight-chain alkoxy group having 1 to 12 carbon atoms, or a straight-chain alkenyl group having 1 to 12 carbon atoms; Preferably, the compound represented by the 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; Preferably, the compound represented by the 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; Preferably, the compound represented by the general formula VII is selected from one or more of the compounds represented by VIIA1-VIIA20; 8. The dye PDLC composition according to any one of claims 1 to 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 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; Preferably, the photoinitiator comprises one or more of benzoin and its ethers, benzil dialkyl ketals, aromatic ketones, oxime esters, thioxanthones or phosphine oxides, preferably one or more of aromatic ketones, oxime esters or phosphine oxides; Preferably, the spacer particles include silicon ball spacers and / or plastic ball spacers; Preferably, the particle size of the spacer particles is 10-30 μm, preferably 10-20 μm.

9. A PDLC dimming film, characterized in that: The method is prepared by using the dye PDLC composition according to any one of claims 1 to 8.

10. The PDLC dimming film according to claim 9, characterized in that: The PDLC dimming film has an off-state haze of >94%, a 60V powered haze of <4%, and a contrast ratio of greater than 8.

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