Coating liquid and antireflection film

By combining hollow silica nanoparticle dispersion and silica sol, an antireflective membrane with a multi-level nanoporous structure was prepared, which solved the problems of insufficient mechanical strength and adhesion in the existing technology and achieved an antireflective effect with low refractive index, high hardness and durability.

CN122080717APending Publication Date: 2026-05-26PEKING UNIV YANGTZE RIVER DELTA INST OF OPTOELECTRONICS
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Patent Information

Application Number
CN202610190604.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-10
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing antireflective coatings, while maintaining low refractive index and broadband antireflective properties, struggle to simultaneously achieve excellent mechanical strength, adhesion, and environmental stability.

Method used

By combining hollow silica nanoparticle dispersion, silica sol, organic temporary binder and film-forming aid, and by controlling the component ratio and process, an antireflective membrane with a multi-level nanoporous structure is prepared. Combined with organic binder and inorganic network, mechanical strength and adhesion are ensured.

Benefits of technology

While achieving a low refractive index, the antireflective coating also possesses high hardness, good adhesion, and durability, making it suitable for large-area optical substrates and adaptable to various process requirements.

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Abstract

The invention relates to the technical field of optical functional films, and discloses a coating liquid and an antireflection film. The coating liquid comprises the following components in parts by volume: 1-3 parts of hollow silicon dioxide nanoparticle dispersion liquid with the solid content of 15-25%; 3-5 parts of silica sol; 1-3 parts of a coalescing agent; and 8-12 parts of an organic temporary adhesive aqueous solution with a solid content of 0.05-0.2%. According to the preparation method disclosed by the invention, the antireflection film which not only can keep low refractive index, but also has good mechanical strength, adhesive force and durability can be prepared by combining the hollow particle skeleton responsible for optical performance with the silicon dioxide sol binder responsible for mechanical strength and assisting process control components such as the organic temporary binder and the coalescing agent. The effective refractive index of the antireflection film can be regulated and controlled to be 1.20-1.35 through the formula proportion, so that the antireflection film can be well matched with the refractive index of air and an optical substrate. The anti-reflection film provided by the invention has good mechanical strength, adhesive force and environmental stability while keeping low refractive index and broadband anti-reflection performance.
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