What Is LSR Application in 3C Accessory?

 Liquid silicone adhesive refers to a layer of liquid silicone coated on metal, rubber, plastic, and other materials. It uses some properties of liquid silicone itself to play a good hand feeling, aging resistance, good release, anti-slip, dustproof, waterproof, and sealing functions. The liquid silicone coating process generally includes three parts: bottom treatment, bottom coating, and liquid silicone. The following steps are detailed.

Treatment of the bottom: The bottom surface of the liquid silicone should be treated well before the package. It is mainly to ensure that the surface of the coated rubber is smooth and flawless, so as not to crack the adhesive when the force is applied; In addition, it is necessary to test whether the surface of the adhesive is clean and whether there is no oil. If there is oil, it needs to be cleaned with xylene and other solvents.

Primer: Generally liquid silicone is non-stick with other materials (except solid silicone), so the material at the bottom is the corresponding primer. Different bottom material corresponding to the substrate is not the same, should be based on the bottom material to choose the correct substrate. When the bottom coating, pay attention to each piece of the coated surface to be coated, and to be coated as thin as possible, such as the bottom coating agent on the surface of the coated conjunctiva is not stuck to the hand can enter the next step.

Liquid silicone encapsulation: This part of the general use of the scraping or gluing process. The scraping method is generally the first to adjust the glue after stirring vacuum coated on the surface of the coated and then scraping flat. The glue-filling method is to pump the glue into the finished mold after vacuuming. After curing, the adhesive adheres to the surface under the action of the base coating agent. Pay attention to ensure that there are no bubbles during the process. Injection molding is also a kind of glue-filling method, but it is automated. If the surface of the rubber parts is uneven, some also need to be polished and polished.

1.Application of liquid silicone in mobile phones and other 3C products' waterproof structural parts

Liquid silicone generally through the secondary molding process and mobile phones and other 3C product structural parts are combined to form waterproof structural parts. Mobile phone waterproof structural parts have a wide range of material applicability, metal, plastic, glass, and other materials can be realized by using the secondary forming method.

2.Application in battery shell waterproof products

Taking PC+TPU+LSR silicone rubber material as an example, the waterproof mechanism can be formed through the process of two-color injection molding + +LIM molding. The formed waterproof battery case has the following features: waterproof, dustproof, and anti-fall functions of the mobile phone; Surface traceless, and no spraying surface treatment; Waterproof grade up to 7. Liquid silicone is formed on the back of the battery shell to seal the battery compartment, which provides sufficient waterproof performance under the premise of multiple disassemblies.

3.Application in kasai waterproof products

Taking plastic + soft rubber +LSR silicone rubber material as an example, the waterproof mechanism can be formed through the combination of two-color injection molding + +LIM molding + spraying process. The characteristics of the formed stopper waterproof products are as follows: TPU and LIM minimal interval molding, surface spraying highlight, and waterproof grade up to 7. Liquid silicone is formed on the back of the double color card plug, which is used for waterproof USB, SIM card, and SD card slots, easy to replace, and has stable waterproof performance.

4. Application of metal Cato waterproof products

Taking powder metallurgy +LSR silicone material as an example, waterproof mechanism parts can be formed through the combination of MIM molding + +LIM molding + spraying process. The formed waterproof Cato has the following characteristics: metal molding in a silicone mold, simple structure, high strength, and waterproof grade up to 5.