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Construction Guide for UV Optical Adhesive

Release time:

2026-01-23 01:03

Construction Guide for UV Optical Adhesive

The coating and curing process of UV optical adhesives is a critical step in achieving optical-grade bonding. The procedure encompasses several stages, including adhesive preparation, coating application, alignment and lamination, UV curing, and post-processing. Precise control at each stage directly affects the final product’s optical performance and bonding reliability.

I. Preparation and Pre-treatment of Adhesive Solution

Before use, the UV optical adhesive must undergo liquid formulation, which mainly includes:

1. Component Mixing: According to the formulation, uniformly mix the prepolymers, active monomers, photoinitiators, and various additives under appropriate conditions.

2. Degassing Treatment: Remove air bubbles from the adhesive solution by means of standing, centrifugation, or vacuum degassing to ensure that the cured adhesive layer is free of defects.

3. Viscosity Adjustment: Adjust the adhesive solution to an appropriate application viscosity based on the coating method and substrate characteristics.

II. Adhesive Coating Method

The coating method should be selected based on the bonding area, adhesive layer thickness, and product structure.

1. Dispensing Process: This process is suitable for precise glue application in localized, small-area, or complex-structure areas and can be integrated with automated dispensing equipment.

2. Scraper/Roller Coating: Commonly used for uniform coating over large areas, with controllable adhesive layer thickness, suitable for panel-type optical components;

3. Screen Printing: This method enables precise graphical application of adhesive and is suitable for bonding applications that require regional isolation or structural constraints.

During the coating process, it is essential to strictly control the amount of adhesive applied to avoid insufficient adhesive, excessive overflow, or uneven thickness. At the same time, pay close attention to environmental cleanliness to prevent dust and impurities from contaminating the process.

III. Alignment and Fit Control

After applying the adhesive, optical components need to be aligned and bonded:

1. Visual alignment system: Utilizing a CCD camera and a motion platform to achieve micron-level alignment, ensuring component positioning accuracy.

2. Bonding method: Methods such as roll pressing, flat-plate pressing, or vacuum bonding can be employed to gradually apply pressure, allowing the adhesive to spread evenly and expelling any air bubbles.

3. Gap Control: Especially for the full-lamination process, it is essential to ensure that the adhesive layer thickness is uniform and consistent, thereby avoiding optical interference phenomena such as Newton’s rings.

IV. Ultraviolet Curing Process

Curing is the critical step in which the liquid adhesive transforms into a solid adhesive layer:

1. Light Source Matching: Select an appropriate UV light source (such as mercury lamps or LEDs) based on the absorption wavelength of the photoinitiator, and ensure that the light intensity distribution is uniform.

2. Curing parameters—such as irradiation time, light intensity, and curing atmosphere (e.g., nitrogen protection)—must be optimized based on the adhesive layer thickness and material properties.

3. Segmented curing: For thicker adhesive layers or complex structures, a staged curing strategy can be employed to prevent the surface from curing too quickly, which might leave the interior partially unreacted.

V. Post-Curing Treatment and Inspection

After curing is complete, the following steps must be performed:

1. Visual Inspection: Visually or with the aid of optical instruments, check the adhesive layer for bubbles, cracks, impurities, or excess adhesive.

2. Performance Testing: Includes determination of adhesion strength, testing of light transmittance and haze, and evaluation of resistance to environmental aging, among others;

3. Cleaning and Protection: Remove surface residues and, if necessary, apply a protective coating or seal the edges.

4. Packaging and Storage: Perform dust-proof and light-protected packaging in a clean environment to ensure stable product performance during transportation and storage.

VI. Key Points for Process Control

1. Environmental Control: Temperature, humidity, and cleanliness levels must meet process requirements.

2. Equipment Maintenance: Regularly calibrate the coating equipment, UV light source, and alignment system;

3. Process Recording: Fully document the process parameters for each batch to facilitate traceability and optimization.

4. Personnel Training: Operators must master the material properties and equipment operating procedures, and possess the ability to troubleshoot on-site issues.

VII. Summary

The coating and curing of UV optical adhesives represent a systematic process that integrates materials science, precision engineering, and process control. From adhesive preparation to final inspection, every stage is closely interconnected, and any deviation could compromise product performance. As optical components evolve toward thinner, lighter, and more reliable designs, the corresponding coating processes must also continuously advance toward higher precision, greater efficiency, and enhanced consistency.

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B-2111D (Aliphatic Polyurethane Acrylate)	Good adhesion to various substrates, high elongation, and resistance to high- and low-temperature shocks; aliphatic polyurethane acrylate.	UV liquid optical adhesive, UV adhesive
B-2116 (Aliphatic Polyurethane Acrylate)	Good adhesion to plastics, excellent flexibility, acid resistance, high elongation at break, and alkali resistance; aliphatic polyurethane acrylate.	UV glue
B-215 (Aliphatic Polyurethane Acrylate)	Good adhesion to glass/metal, excellent flexibility, water resistance, acid resistance; aliphatic polyurethane acrylate.	Glass/Metal UV Adhesive
B-2621 (Aliphatic Polyurethane Acrylate)	High molecular weight, excellent adhesion to plastics, good flexibility, resistant to strong acids and strong bases, and low curing shrinkage—aliphatic polyurethane acrylate.	Odor-Reducing UV Adhesive

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