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Types of Liquid Optical Adhesive

Release time:

2026-01-20 16:55

Liquid optical adhesives are a class of specialty adhesive materials characterized by high transparency, excellent bonding performance, and superior environmental resistance, making them widely used in display modules, optical devices, and electronic packaging. Based on their curing mechanisms, compositional features, and application scenarios, liquid optical adhesives can be classified into the following major types.

I. Room-Temperature-Curing Liquid Optical Adhesive

These optical adhesives typically cure at room temperature or moderate temperatures, often using acrylic-based resin systems. They feature low curing shrinkage and excellent yellowing resistance. Their application process is relatively straightforward, making them suitable for production environments with modest requirements for curing equipment. They are widely used in conventional optical bonding applications such as full-lamination of display panels and touch-screen assembly.

II. UV-Curable Liquid Optical Adhesive

This type of adhesive cures rapidly under UV irradiation, with the curing process primarily driven by photoinitiator-induced polymerization. Its key advantages are fast curing speed and high production efficiency, making it well suited for automated continuous production lines. However, due to the limited penetration depth of UV light, effective deep-layer curing in thicker adhesive layers or complex structural areas must be ensured through process optimization.

III. Thermosetting Liquid Optical Adhesive

Thermosetting optical adhesives require heat to initiate the crosslinking reaction, and the curing temperature can be adjusted according to the formulation. These adhesives typically exhibit thorough cure and excellent deep-cure performance, making them suitable for optoelectronic components with thicker structures or those that are insensitive to temperature changes. However, the thermosetting process is energy-intensive and may introduce internal stresses due to temperature fluctuations.

IV. Composite-Curing Liquid Optical Adhesive

Composite curing systems combine the advantages of photoinitiated and thermally induced curing: surface drying is typically achieved via UV irradiation, followed by thermal treatment to complete deep-layer curing. This approach balances curing efficiency with curing depth, making it well suited for applications that demand high bond strength, reliability, and production efficiency, such as in-vehicle displays and high-end camera modules.

V. Functional Specialty Liquid Optical Adhesive

In addition to the aforementioned general types, there are also liquid optical adhesives with special functions, such as:

1. Conductive optical adhesive: Maintains high light transmittance while providing electrical conductivity, and is used for transparent circuit interconnections or electromagnetic shielding applications.

2. High-temperature-resistant optical adhesive: Maintains stable performance in high-temperature environments, making it suitable for applications such as engine-compartment displays and industrial instrumentation.

3. High-refractive-index optical adhesives: with tunable refractive indices, used in specialized optical designs and emerging fields such as augmented reality.

VI. Summary

Liquid optical adhesives come in a wide variety of types, and their selection requires a comprehensive consideration of multiple factors, including curing conditions, bonding requirements, production efficiency, and service environment. With the continuous innovation in optical and electronic products, liquid optical adhesives are steadily advancing toward faster curing, higher reliability, multifunctional integration, and environmental friendliness, thereby meeting ever-increasing application demands.

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Bossin Recommended Products – Liquid Optical Adhesive
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-2111D	Aliphatic polyurethane acrylate	Excellent adhesion, high elongation, and resistance to thermal shock at both high and low temperatures.
B-2116	Aliphatic polyurethane acrylate	Excellent adhesion, good flexibility, acid and alkali resistance, and excellent tensile strength.
B-215	Aliphatic polyurethane acrylate	Good adhesion, good flexibility, water resistance, acid resistance
B-2621	Aliphatic polyurethane acrylate	Excellent adhesion, excellent resistance to strong acids and strong bases, and low curing shrinkage.
Single Product Recommendation
Product Model/English Abbreviation	Product Name/Product Type	Product Features
BM1105 (OPPEA)	O-Phenylphenoxyethyl acrylate	Low shrinkage, adhesion, low volatility, and high refractive index
BM1210 (PHEA)	2-Phenoxyethyl acrylate	Low shrinkage, heat resistance, excellent adhesion, high refractive index
BM1211 (HPMA)	Hydroxypropyl methacrylate	HEMA-free, high strength, low irritation, high adhesion
BM2101M (10EO-BPADMA)	Ethoxylated Bisphenol A Dimethacrylate	Low irritancy, flexibility, high strength, and heat resistance
BM2224 (EO-HDDA)	Ethoxy-1,6-hexanediol diacrylate	Excellent adhesion to plastics, good dilutability, and low volatility.

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