CN-121276833-B - Dye PDLC dimming film and application thereof

Abstract

The invention relates to the technical field of dimming films, and particularly discloses a dye PDLC dimming film and application thereof. The dye PDLC dimming film comprises two layers of transparent ITO conductive films and a dye PDLC composition with an intermediate layer, wherein the transmittance of the transparent ITO conductive films is 10.00% -70.00%, the a value is-5, the b value is-4-8, the contrast ratio of the dye PDLC dimming film is more than or equal to 20, the dark state transmittance is 0.00% -1.00%, and the bright state transmittance is 2.00% -20.00%. According to the invention, the dye PDLC dimming film prepared by optimizing the film material of the dye PDLC dimming film has excellent contrast ratio, dark state transmittance and bright state transmittance, and the problems of low contrast ratio and large chromatic aberration after long-time sunlight illumination of the existing dye PDLC dimming film can be obviously solved.

Inventors

• ZHAO XIAOXIANG
• LI ZHENGQIANG
• LI JINGLEI
• LIU LULU
• Qin Gengli

Assignees

• 石家庄诚志永华显示材料有限公司

Dates

Publication Date

20260505

Application Date

20251211

Claims (5)

1. 1. The dye PDLC dimming film is characterized by comprising two layers of transparent ITO conductive films and a dye PDLC composition with an intermediate layer, wherein the transmittance of the two layers of transparent ITO conductive films is 35.02% -53.20%, the haze is less than or equal to 0.63% -1.00%, the a value is minus 0.9% -0.85, the b value is minus 1.0% -0.07, the contrast ratio of the dye PDLC dimming film is more than or equal to 20, the dark state transmittance is 0.00% -1.00%, and the bright state transmittance is 2.00% -20.00%; the dye PDLC dimming film is obtained by UV light curing through light intensity irradiation energy of 10000-25000 mJ/cm 2 ; The dye PDLC composition comprises (by mass) a dichroic dye liquid crystal, photo-curing glue and a spacer, wherein the mass ratio of the dichroic dye liquid crystal is (30-70): (0.2-2); The dichromatic dye liquid crystal comprises the following raw material components, by mass, 1% -10% of dichromatic dye and 90% -99% of nematic liquid crystal; The clear point of the nematic liquid crystal is more than or equal to 110 ℃, the optical anisotropy is more than or equal to 0.2, and the dielectric anisotropy is more than or equal to 10; The nematic liquid crystal comprises, by mass, 60% -80% of a compound shown in formula 1, 5% -25% of a compound shown in formula 2 and 5% -25% of a compound shown in formula 3; The compound of formula 1 is selected from at least one of formulas 1-1 to 1-13: A compound of the formula 1-1, Formula 1-2, The formula is 1-3, Formula 1-4, Formula 1-5, Formulae 1 to 6, Formula 1-7, Formula 1-8, Formula 1-9, 1-10, Formula 1-11, 1-12, Formulas 1-13; the compound shown in the formula 2 is selected from at least one of the formula 2-1, the formula 2-2 or the formula 2-3: a compound of the formula 2-1, Formula 2-2, Formula 2-3; the compound shown in the formula 3 is at least one selected from the formula 3-1 or the formula 3-2: Formula 3-1, Formula 3-2.
2. 2. The dye PDLC dimming film of claim 1, wherein said transparent ITO conductive film has a sheet resistance of 5-250 Ω and a thickness of 50-250 μm.
3. 3. The dye PDLC dimming film of claim 1, wherein said dichroic dye comprises at least one of compounds of formula I-VII: A formula I, A formula II, A formula III, A formula IV, V (V), A formula VI, Formula VII; Wherein, the ~ Each independently selected from 、 、 、 Or (b) Any one of them; R 1 ~R 14 is independently selected from any one of H, straight-chain or branched-chain alkyl of 1-12 carbon atoms, alkoxy, alkylcarbonyl, alkoxycarbonyl, straight-chain or branched-chain alkenyl of 2-12 carbon atoms or alkenyloxy; Each X 1 、X 2 、X 3 、X 4 is independently selected from amino or hydroxy.
4. 4. The dye PDLC dimming film of claim 3, wherein said compound of formula I is selected from at least one of formula I-1 or formula I-2: a formula I-1, Formula I-2; the compound shown in the formula II is at least one selected from the formula II-1 or the formula II-2: Formula II-1, Formula II-2; The compound shown in the formula III comprises ; The compound shown in the formula IV is at least one selected from the formula IV-1 or the formula IV-2: a formula IV-1, Formula IV-2; the compound shown in the formula V is at least one selected from the formula V-1, the formula V-2 or the formula V-3: Formula V-1, Formula V-2, Formula V-3; The compound shown in the formula VI is at least one selected from the formula VI-1, the formula VI-2 and the formula VI-3: Of the formula VI-1, Of the formula VI-2, Formula VI-3; the compound shown in the formula VII is selected from at least one of a formula VII-1, a formula VII-2 or a formula VII-3: formula VII-1, Formula VII-2, VII-3。
5. 5. The application of the dye PDLC dimming film according to any one of claims 1-4 in preparing intelligent glass for automobiles, high-speed rails, airplanes or buildings.

Description

Dye PDLC dimming film and application thereof Technical Field The invention relates to the field of dimming films, and relates to a dye PDLC dimming film and application thereof. Background The polymer dispersed liquid crystal film (i.e., PDLC film) is milky-white in appearance when not energized, becomes transparent after energized, and is widely used in smart glass, sunroof, etc. because it can rapidly switch states at a lower voltage. Recently, various dichroic dyes are added into polymer dispersed liquid crystals, so that the appearance color of the PDLC can be changed, the control of light transmittance can be improved, and the contrast can be improved. The dichromatic dye shows different colors through different light absorption in the major axis direction and the minor axis direction of the dye molecule. When the electric field is applied, the liquid crystal molecules in the liquid crystal microdroplet are uniformly arranged along the direction of the electric field, the dye molecules are also orderly arranged along with the liquid crystal main body, at the moment, light is transmitted, the dye PDLC presents a transparent state, the transmittance is higher, and the state is defined as a bright state. Light passing through the major axis and the minor axis of dye molecules is absorbed and transmitted respectively, so that the transmittance is lower, namely, the light transmitted through the dye PDLC is less than that of the common PDLC. The ratio of light transmittance in bright state to dark state is the contrast ratio of PDLC. The current PDLC dimming film still has the problem of low contrast. With the improvement of contrast, the visual conversion effect is better when the transparent state and the dark state of the dye PDLC are switched. At present, the contrast of dye PDLC is about 10, the visual effect is poor, the blocking rate to sunlight is poor in the dark state, and a high-contrast dye PDLC dimming film needs to be developed, wherein the contrast is more than or equal to 20, so that sunlight is fully blocked in the dark state, and the bright state can clearly penetrate the scene outside the window, so that the application in the field of automobile windows is satisfied. The current PDLC dimming film has serious limitation in contrast improvement due to limitations of factors such as an ITO substrate, a dichroic dye, and a liquid crystal composition, and it is difficult to achieve excellent black display and high contrast effects. In addition, the current PDLC dimming film has poor sunlight tolerance, the contrast and chromatic aberration of the dye PDLC dimming film are larger after long-time sunlight irradiation, and when the dye PDLC dimming film is applied to outdoor or extreme environments such as vehicle-mounted backdrop, building curtain walls and the like, the PDLC dimming film is inevitably exposed to long-time sunlight irradiation conditions, ultraviolet rays and the like contained in sunlight are easy to cause degradation of dye and polymer matrixes, so that the fading or color drift of the PDLC dimming film is influenced, the use experience of consumers is influenced, and therefore, the improvement of the contrast and chromatic aberration variation stability of the dye PDLC dimming film after long-time sunlight is important. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a dye PDLC dimming film and application thereof. The dye PDLC dimming film has the advantages of dark state transmittance of 0.00% -1.00%, bright state transmittance of 2.00% -20.00% and contrast of 20 or more, can maintain higher contrast and lower color difference change after long-time sunlight illumination, has excellent sunlight tolerance performance, and can be widely applied to the fields of intelligent glass of automobiles, high-speed rails, airplanes or buildings and the like. In order to achieve the above purpose, the invention adopts the following technical scheme: The invention provides a dye PDLC dimming film which comprises two layers of transparent ITO conductive films and a dye PDLC composition with an intermediate layer, wherein the transmittance of the transparent ITO conductive films is 10.00% -70.00%, the a value is-5, the b value is-4-8, the contrast ratio of the dye PDLC dimming film is more than or equal to 20, the dark state transmittance is 0.00% -1.00%, and the bright state transmittance is 2.00% -20.00%. Compared with the prior art, the invention has the following advantages: (1) According to the invention, a dye PDLC dimming film with dark state transmittance of 0.00% -1.00% and bright state transmittance of 2.00% -20.00% can be prepared by selecting two specific transparent ITO conductive films and matching with a dye PDLC composition after UV light curing, and the contrast ratio of the dye PDLC dimming film is more than or equal to 20; (2) The dye PDLC dimming film provided by the invention can maintain higher contrast and lower color differen