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The preparation process of UV optical adhesive

Release time:

2026-01-22 10:59

The preparation process of UV optical adhesive

As an important class of functional adhesive materials, UV optical adhesives have their preparation processes and quality control directly influencing the performance of the final products. The following provides a systematic overview of the manufacturing process of UV optical adhesives, covering aspects such as raw material selection, formulation development, production process flow, and performance verification.

I. Composition of Main Ingredients

The formulation of UV optical adhesives is based on a variety of functional raw materials:

1. Prepolymers: As the skeletal material of the system, the type and amount of prepolymers determine the mechanical properties and environmental stability of the cured product. Commonly used prepolymers include acrylate-based polymers, epoxy-modified acrylates, and polyurethane acrylates. The choice among these depends on requirements for hardness, flexibility, and adhesion.

2. Active Monomers: These monomers serve a dual role, both diluting the formulation and participating in crosslinking. The functionality of the monomer influences the curing speed and network density. Monofunctional monomers can adjust flexibility, while polyfunctional monomers help enhance the curing rate and hardness.

3. Photoinitiators: These are the core components that trigger photopolymerization reactions. They must be matched to the wavelength of the UV light source used, while also taking into account their solubility in the system and reaction efficiency. Common types include radical-type and cationic photoinitiators.

4. Functional additives: To improve process adaptability and final performance, it is often necessary to add leveling agents, defoamers, antioxidants, adhesion promoters, and other such additives. Although used in small quantities, these additives play a crucial role.

II. Key Points in Formulation Design

Formula design must comprehensively consider the performance requirements of the application scenario:

1. Mechanical Property Control: By adjusting the types and ratios of prepolymers and monomers, the hardness, toughness, and adhesion to different substrates of the adhesive layer can be regulated.

2. Optimization of Curing Efficiency: The selection and dosage of photoinitiators, along with the combination of monomer functionalities, collectively influence the curing speed and degree of completion.

3. Optical Performance Assurance: All raw materials shall have high purity and excellent light transmittance, ensuring that the cured adhesive layer exhibits high light transmittance and low haze.

4. Enhanced Durability: By adding antioxidants, UV absorbers, and other additives, the adhesive layer’s stability is improved under long-term exposure to environmental conditions such as prolonged sunlight and high humidity and heat.

III. Production Process Flow

The production of UV optical adhesives mainly includes the following steps:

1. Ingredients and Mixing: Accurately weigh each ingredient according to the recipe, and add them to the mixing equipment under conditions of light shielding or low illumination. During the mixing process, it is necessary to control the temperature and stirring speed to ensure that all ingredients are evenly dispersed.

2. Degassing Treatment: The mixed adhesive solution must undergo vacuum degassing or centrifugal degassing to remove air bubbles introduced during the mixing process, ensuring that the adhesive layer is free of defects after curing.

3. Filtration and Purification: A multi-stage filtration system is employed to remove potential particulate impurities from the adhesive solution, ensuring product cleanliness and optical uniformity.

4. Performance Testing: Conduct tests on intermediate products—including viscosity, curing speed, light transmittance, and preliminary adhesion strength—to ensure they meet the predefined specifications.

5. Filling and Packaging: Perform sub-packaging in a clean environment, use light-proof and sealed packaging, and clearly label information such as batch number, storage conditions, and expiration date.

IV. Quality and Process Control

To ensure product consistency, a comprehensive control system must be established during production:

1. Raw Material Testing: Conduct incoming inspections of raw materials to ensure purity and stable performance.

2. Production Records: Record key parameters of the production process, such as temperature, mixing time, vacuum level, and others.

3. Sample Retention Testing: Retain samples of each batch of products for long-term aging and reliability testing.

4. Comprehensive Inspection: Conduct final comprehensive performance verification before filling, covering items such as optical properties, mechanical performance, and environmental durability.

V. Summary

The preparation of UV optical adhesives is a systematic engineering endeavor that integrates material formulation, chemical processing techniques, and quality control. From the careful selection of raw materials and scientific formulation ratios to precision manufacturing, every step directly influences the final product’s performance in terms of optical transparency, bonding reliability, and environmental adaptability. As application demands continue to rise, the preparation processes will keep evolving toward higher purity, improved performance, and greater consistency.

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Key Technologies for Preparing UV Optical Adhesives

Common forms of UV optical adhesives and their applicable fields