Answer: Addition-type liquid silicone rubber, also known as high-power LED encapsulation glue.
Answer analysis:
This encapsulation glue has a series of excellent properties, making it an ideal choice for high-power LED encapsulation. The following is a detailed analysis of high-power LED encapsulation glue:
Definition and characteristics
Definition: High-power LED encapsulation glue refers to addition-type liquid silicone rubber used for light-emitting diodes with large rated working currents.
Features:
1. Colorless and transparent: The encapsulation glue remains colorless and transparent before and after curing, which helps to maintain the optical properties of the LED.
2. No low-molecular by-products: No low-molecular by-products are produced during the curing process, reducing the potential impact on LED performance.
3. Low stress: The colloid stress after curing is small, which helps to protect the LED chip from mechanical stress damage.
4. Deep vulcanization: It can achieve deep vulcanization to ensure the uniformity and integrity of the encapsulation layer.
5. No corrosion: It is non-corrosive to the LED chip and its surrounding materials, ensuring the safety of the encapsulation process.
6. Resistance to cold and hot shock, high temperature aging and UV radiation: It has excellent weather resistance and can adapt to various harsh environmental conditions.
Product classification
High-power LED encapsulation glue can be mainly divided into two-component addition-type silicone rubber, which includes two types: elastic silicone gel and silicone rubber. The two are slightly different in performance and application:
Elastic silicone gel: low strength, very low hardness, still has excellent adhesion after curing, suitable for potting of LEDs with PC lenses, etc.
Silicone rubber: high strength, high temperature resistance, reflow soldering, suitable for potting without PC lenses.
Application field
High-power LED encapsulation glue is widely used in various fields that require high-power and high-performance LEDs, such as lighting, display, automotive electronics, aerospace, etc. Especially in the encapsulation process of high-power LED lamp beads, this encapsulation glue plays a vital role.
Brand and model examples
There are many brands and models of high-power LED encapsulation glue on the market, such as Kraft K-5508, K-5508L, K-5508T series, and Dow Corning OE-6650AB, OE-6550, etc. These products have excellent performance and broad application prospects.
Precautions for use
When using high-power LED encapsulation glue, you need to pay attention to the following points:
* Strictly follow the product instructions to ensure that the mixing ratio and curing conditions are correct.
* Stir thoroughly before use to ensure that the colloid is uniform and free of bubbles.
* Pay attention to safety precautions to avoid contact between the glue and the skin and eyes.
* Although the cured colloid has excellent performance, it is still necessary to avoid long-term exposure to extreme environmental conditions.
In summary, high-power LED encapsulation glue is one of the key materials in the high-power LED packaging process and is of indispensable importance. By selecting the right encapsulation glue and using it correctly, the performance and quality of LED products can be fully guaranteed.