Application of wireless charging commercial display organic silicon pressure-sensitive adhesive in the consumer electronics industry

With the development of the times, concepts such as 5G, artificial intelligence, virtual reality, and big data have entered the public eye with the advancement of technology, driving a new round of upgrading and popularization of consumer electronics.

1. 5G technology is driving the rapid growth of global smartphones that have entered stock replacement, with China accounting for the majority of shipments.

2. The wireless charging field has become a hot topic again with Apple joining the WPC alliance, and it is expected that the market size will exceed 10 billion US dollars by 2024.

The size of TV panels is growing at a rate of about 1 inch per year, driving the demand growth rate for LCD screens to remain at 5-8% in the next three years. OLED flexible screens have also become popular due to their better compatibility with wearable devices and rapid market growth. Although the panel industry has fully entered the era of localization, the demand for localization of optical materials remains very strong.

01

What are the functions of pressure-sensitive adhesives in different fields

The manufacturing process of electronic devices is mostly sophisticated, with multi-step processes and high complexity of components, which have given rise to many supporting industries. Pressure sensitive adhesive materials play a crucial role in different fields.

Pressure sensitive adhesive is a type of adhesive material that produces viscous flow through slow and appropriate external forces, achieving close contact with the surface of the object being adhered, generating intermolecular forces, and achieving interfacial bonding.

knowledge

Pressure sensitive adhesive function

① In the field of wireless charging, pressure-sensitive adhesive tape helps to bond, fix, and protect the modules of the receiving and transmitting ends, enabling them to achieve energy efficiency.

② In the field of display, optical pressure-sensitive adhesive is used inside the screen to bond various optical materials, ensuring their optical transparency even under high temperature and humidity conditions, and guaranteeing the clarity of imaging.

③ Protect various "delicate" electronic components (such as screens and their parts) during the manufacturing process and shipping process to prevent them from being damaged due to scratches and bumps that may occur during transportation.

Organic silicon pressure-sensitive adhesive is widely used in the preparation of various electronic industry protective films, providing comprehensive protection for the transportation, manufacturing, and use of precision components.

02

Characteristics and Selection of Organic Silicon Pressure Sensitive Adhesive

There are various types of protective films, and ordinary protective films have simple structures without functional layers. The substrate and pressure-sensitive adhesive are their main components. Select different substrates according to different application scenarios and functional requirements, commonly including PET, PE, OPP, PI, TPU, PVC, etc. The pressure-sensitive adhesives used for protective films can be divided into polyurethane (PU), acrylic, and silicone types, with vastly different physical and chemical properties.

Organic silicon pressure-sensitive adhesive has become the top choice in the field of electronic protective films due to its advantages in high and low temperature resistance, weather resistance, exhaust, and transparency.

Viscosity is usually the primary consideration when choosing silicone pressure-sensitive adhesives. Viscosity is different from adhesive force. The commonly referred to "adhesive force" generally refers to the peeling force between the substrate and the protective film. Viscosity also includes initial adhesion, holding adhesion, and cohesion, which are all factors that customers need to consider comprehensively when choosing pressure-sensitive adhesives. The backing of the substrate, the thickness and formula of the adhesive coating can also affect the adhesion of the pressure-sensitive adhesive.

The world's second largest silicone manufacturer, Wacker Chemie, offers a range of different (high, medium, low) adhesive strengthsOrganic silicon pressure-sensitive adhesiveProduct: DEHESIVE ® PSA 845T、DEHESIVE ® PSA 847M、DEHESIVE ® PSA 846L and DEHESIVE ® PSA 765 CN。 Different adhesive requirements can be achieved through mutual matching, among which DEHESIVE ® PSA 765 CN is a high value product that does not contain solvents and has the advantage of localized production and supply.

In addition to stable adhesion performance, this series of products also has the following characteristics

Similar viscosity, good mixing uniformity

1. Good viscosity regulation stability

2. Good coating appearance

3. Longer bath life

4. Can achieve low-temperature curing

In addition to the conventional adhesive requirements, application performance is another key factor in selecting pressure-sensitive adhesives

For example:

1. Shipping protection of components (such as polarizing film): the die-cutting ability, silicon transfer, residual adhesive, and wet heat aging performance of the protective film. The transfer or residue of silicone pressure-sensitive adhesive can cause changes to the surface of the protected object, damaging its original unique properties. Wacker DEHESIVE ® PSA 845T、DEHESIVE ® Even after aging for several days under high temperature and high humidity (85 ℃/85% RH) conditions, PSA 847M medium high viscosity products will not exhibit adverse phenomena such as backing delamination. And it has stable adhesion and excellent die-cutting performance.

2. Process protection of components (such as vapor deposition coatings, screen printing): silicon transfer and aging performance under extreme conditions. Silicon pressure-sensitive adhesive needs to withstand special conditions of certain processes to ensure that the process functionalizes specific target components without affecting other components.

For example:

With the increasing demand for shooting effects, the process of functional coating on the lens has become particularly important. The coating process usually needs to withstand temperatures of 200 ℃ or even higher ® PSA 845T can withstand this temperature for a short period of time, maintaining sufficient adhesion and cohesion to ensure that the bonding process does not warp and avoid steam affecting other parts. At the same time, there is no residual adhesive after peeling, and there is less silicon transfer, which will not have adverse effects on subsequent processing.

3. Terminal protection for electronic products (such as tempered film for mobile phones): The transparency, wettability, and exhaust properties of the adhesive. DEHESIVE ® The excellent exhaust performance of PSA 765 CN endows the protective film with good adhesion, making it an ideal choice for protecting smart devices.