Current Status And Prospects Of Electronic Adhesives

      Electronic adhesives are indispensable auxiliary materials in the electronics industry. Through bonding, sealing, potting, coating, electrical conductivity, thermal conductivity, and insulation, they enhance the reliability, stability, and service life of electronic products. Their applications encompass a wide range of areas, including electronic component mounting, heat dissipation module installation, and high-voltage insulation protection, providing critical support for the operation of electronic equipment in complex environments. Electronic adhesives are primarily categorized into silicone, epoxy, acrylate, and polyurethane adhesives, with silicone and epoxy being widely used due to their superior performance. Electronic adhesives are at the top of the market, offering high added value, extensive technical expertise, and exceptional performance, earning them the status of the "crown jewel" of high-tech manufacturing.

    The electronic adhesive market can be divided into three main categories: electronics assembly, semiconductor packaging, and optical displays. (1) The electronics assembly industry generally includes smartphones, laptops/tablets, TWS earphones, smart speakers, wearable devices, AR/VR, automotive electronics/drone electronics, 5G communications, and the Internet of Things. Parts involved include cameras, speakers, cover plates, screens, and bezels. Key adhesive types include epoxy structural adhesives, two-component acrylic structural adhesives, UV adhesives, anaerobic adhesives, instant adhesives, polyurethane adhesives (structural adhesives, PUR adhesives), and silicone adhesives (three-proof, thermally conductive, sealing, and potting). (2) Semiconductor packaging applications can be divided into integrated circuit packaging and LED packaging. Adhesives used in IC packaging include underfill, chip adhesives/dam adhesives, die-bonding adhesives, and thermally conductive interface materials (polymers). Adhesives used in LED packaging include encapsulating silicone and epoxy adhesives. (3) Optical display adhesives (OCA/LOCA) facilitate the bonding of LCD or OLED displays, touch panels, cover plates, and other components, making them essential materials in display modules.

   As a key link in the electronics manufacturing industry chain, electronic adhesives have seen rapid growth in recent years, driven by technological upgrades and downstream demand. According to statistics and analysis by the China Adhesives and Adhesive Tape Industry Association, my country's total electronic adhesive consumption currently stands at approximately 20,000 tons, with a market size of approximately 12 billion yuan. This consumption accounts for approximately 0.2% of the adhesive industry's total output, and the market size accounts for approximately 10% of the industry's total output value. Calculated by application, semiconductor packaging adhesives and optical display adhesives account for a relatively large proportion of the market; by product system, acrylate, silicone, and epoxy systems account for a relatively large proportion of the market. Calculated by the market size of domestic and foreign brands, the overall self-sufficiency rate for electronic adhesives is only 30%, with semiconductor packaging and optical display adhesives having lower self-sufficiency levels, while lighting and electronic assembly adhesives have higher self-sufficiency levels.

      With the continuous expansion of electronic adhesive applications and ongoing innovation in downstream industry technologies and processes, the China Adhesives and Adhesive Tape Industry Association believes that the development trends of electronic adhesive technology in my country are as follows:
1. With the rapid development of miniaturization, integration, and portability in electronic products, the requirements for electronic adhesives' thermal conductivity, bonding properties, and special functionality are becoming increasingly stringent, and the functions of electronic adhesives will also become more diversified.

2. Based on process and performance requirements, underfills must possess the basic characteristics of easy handling, fast flow, fast curing, long service life, high bond strength, and low modulus, while also meeting requirements for fillability, compatibility, and reworkability.

3. Vigorously develop conductive adhesives that exhibit high conductivity, high bond strength, and high stability at room temperature curing, develop new conductive fillers, develop new conductive adhesive curing systems, and develop flexible conductive adhesives with excellent adhesion to stretchable substrates and electronic components.

4. Adhesives for optical displays require, in addition to basic properties such as high transmittance, low haze, a refractive index close to the substrate, and good adhesion, stable adhesion to curved surfaces, high flow and filling properties, dynamic and static bending properties, and improved optical performance.

5. High-purity, narrow molecular weight distribution matrix resins, compounded spherical fillers, specialized toughening technologies, specialized crosslinker structural design and preparation, and precise production processes are key to improving the quality and performance of electronic adhesives.

As a crucial material in the electronics industry, the development of electronic adhesives is deeply intertwined with technological advancements in downstream electronic information, semiconductors, and new energy sectors. The industry is currently experiencing three core trends: innovation-driven development, green transformation, and market expansion. In the future, it is expected to achieve a leap in both scale and quality through technological breakthroughs and expanded applications.