Black dichroic dye composition and a pdlc light control film and a preparation method and application thereof

By using anthraquinone dichroic dyes with hydroxyl substituents in the PDLC dimming film, the dye order is improved and the problem of low dye order and color drift in the prior art is solved through precise formulation. This results in a PDLC dimming film with high contrast and high color stability, which is suitable for smart dimming glass in automobiles and buildings.

CN122405028APending Publication Date: 2026-07-17HAINING MODERN CHEM CO LTD
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Patent Information

Application Number
CN202610509903.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-17
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing black PDLC dimming films suffer from problems such as low dye order, color drift, low contrast, and poor light-blocking effect, which limits the performance of high-end intelligent dimming devices.

Method used

Yellow, red, purple, and blue anthraquinone dichroic dyes with hydroxyl substituents are used to enhance the orderliness of dye molecules by forming hydrogen bonds with liquid crystal molecules through hydroxyl groups. PDLC dimming films are prepared through precise proportioning and photocuring processes to ensure synchronous dye orientation and constant absorption ratio.

Benefits of technology

It achieves high contrast, high color stability and excellent on/off transmittance, meeting the performance requirements of high-end dimming devices. It has good color consistency in bright and dark states, with a transmittance-to-contrast ratio of 15-25, on/off transmittance of 25-35% and off transmittance of 1.0-2.5%.

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Abstract

The present application relates to the technical field of PDLC dimming film, in particular to a black dichroic dye composition, a PDLC dimming film and a preparation method and application thereof. The black dichroic dye composition comprises the following dichroic dyes: yellow anthraquinone dichroic dye, red anthraquinone dichroic dye, purple anthraquinone dichroic dye and blue anthraquinone dichroic dye; the dye molecules of the dichroic dyes all contain at least one hydroxyl substituent. The dimming film prepared from the black dichroic dye composition has an on-state transmittance of 25-35%, an off-state transmittance of 1.0%-2.5%, a transmittance contrast (T on / T off ) of 15-25 under the conditions of a total dye concentration of 4.8-6.0 wt%, a device thickness of 20 μm and a driving voltage of 60 V, and meets the requirements of high-end dimming devices for high on-off contrast.
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Citation Information

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