Black UV (ultraviolet) edge sealing adhesive for liquid crystal display without frames on four sides and preparation method of black UV edge sealing adhesive

By combining aliphatic polyurethane acrylate with nano-sized spherical silica powder to form an interpenetrating network structure, the problems of soft-hard imbalance and insufficient weather resistance of UV-cured black edge-sealing adhesive are solved, thus achieving the high screen-to-body ratio and durability requirements of four-sided borderless LCD displays.

CN121108924APending Publication Date: 2025-12-12HEFEI MICROCRYSTALLINE MATERIALS TECH CO LTD
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Patent Information

Application Number
CN202511345623.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-09-19
Publication Date
2025-12-12

AI Technical Summary

Technical Problem

Existing UV-curable black edge-sealing adhesives for four-sided borderless LCD displays suffer from problems such as low UV curing efficiency, imbalance between soft and hard properties, insufficient weather resistance, and difficulty in balancing cost. This results in weak edge sealing, easy deformation, and poor weather resistance, failing to meet the requirements of high screen ratio and durability.

Method used

An interpenetrating network structure is formed by combining aliphatic polyurethane acrylate with nano-sized spherical silica powder. This combines the flexibility of long-chain polyurethane acrylate with the rigidity of silica powder to improve the supporting strength and flexibility of the colloid, enhance water resistance, and select a high-efficiency photoinitiator to ensure rapid curing.

Benefits of technology

It achieves low shrinkage, excellent impact resistance and weather resistance of the edge sealing adhesive, ensuring the appearance stability and service life of the display screen, meeting the high-efficiency curing requirements of industrial production, and reducing production costs.

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Abstract

The invention discloses a black UV edge sealing adhesive for a liquid crystal display without a frame on four sides and a preparation method of the black UV edge sealing adhesive. The black UV edge sealing adhesive comprises the following raw materials: urethane acrylate, an acrylate diluent, a photoinitiator, a defoaming agent, a dispersing agent, a silane coupling agent, silica powder and carbon black. According to the invention, the flexible aliphatic polyurethane acrylate and the nanoscale spherical silica powder are selected and compounded to construct a'soft-hard 'interpenetrating network structure, so that the edge sealing adhesive is endowed with excellent properties: the UV curing time is short, the sizing is rapid, and the industrial efficient production requirement is met; after being cured, the colloid has high flexibility and strong supporting performance, rigid damage in the construction and using process is effectively reduced through the flexibility, the whole-face liquid crystal display can be stably lifted through the sufficient strength, and guarantee is provided for achieving the design that the four edges are free of frames; the volume shrinkage rate is low, obvious deformation caused by shrinkage of the edge of the display screen can be avoided, and the external dimension precision of a frameless product is guaranteed; the cable has good water resistance and weather resistance, and can play a role in a complex environment for a long time.
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