LED large family as an important one LED soft light at night in the city beautification, architectural lighting and vehicle lighting and beautiful aspects of the application more and more. With the popularity of LED flexible strips, more and more manufacturers are faced with the problem of choosing a suitable LED soft strip encapsulant.
At present, there are three kinds of products of epoxy resin potting compound, polyurethane potting glue and silicone potting glue. These three products have their own different characteristics. The epoxy resin potting compound generally has a good light transmittance for the packaged product of the AB component. Generally, the light transmittance is between 85 and 92%; the light stacking effect has a good stacking effect, and the light bar has a smooth curved curvature. It can be used in the range of -5 ° C to 55 ° C; however, because the Tg point of the epoxy resin itself is low, the toughness tends to deteriorate at high temperatures. When the temperature exceeds 60 ° C, the soft strip rubber softens and the colloid is liable to break. At the same time, when the temperature is lower than -5 degrees Celsius, the colloid will become hard and the brittle light bar will shake slightly, and the phenomenon of colloidal peeling and embrittlement will occur. After the lamp is lit for 400-700 hours, the epoxy resin gel above the lamp bead becomes Yellowish brown causes the brightness of the light to drop and the color temperature to change.
Polyurethane potting compound is also called PU glue. Generally, the light bar of AB packaging product has a light transmittance of 85-92%. The light bar has good flexibility. After curing, the colloid can be used for a long time between -25 ° C and 95 ° C. However, due to the hardness of the polyurethane colloid can not be very low, the product can only be applied to the epoxy type or semi-casing type flexible strips with the decrease of the temperature, the flexibility of the strip changes greatly; when filling the FPC surface and If the humidity is too high, the surface of the product is prone to white fog and insufficient adhesion. The long-term use of colloids in the outdoors usually causes yellowing in 2-3 years.
Silicone potting compound is generally a single component or AB component package product, the light transmittance is generally 84-92%. After curing, the hardness of the gel can be adjusted. It can be used as a jelly-type gel or as a shoreA30 degree. Harder glue, so silicone encapsulant can be used for Epoxy type light strips or semi-casing type light strips. It can also be used for full-casing type light strips after curing. The colloid can be used at -45 ° C to 200 ° C. There is no significant change in the mechanical and physical properties and optical properties of the product as it is used and as a function of temperature. It is very suitable for use in cold regions such as Russia, Northern Europe and North America; silicone potting lamp strips are resistant to ozone, ultraviolet light, acid and alkali, etc. Outdoor use can maintain non-yellowing for a long time; but silicone potting glue also exists with FPC. The adhesion is lower than that of the epoxy stack.
In terms of market development, the trend of silicone potting compounds to replace other products is increasingly obvious. If it is a light bar that needs to be used in harsh environments, it is necessary to use silicone potting glue.
HOME SAFES
HOME SAFES , a kind of storage box for important documents and valuables.
Details:
Home Safe is a kind of an anti-drilling, an anti-burglar and an anti-force safe;
It provides security solution for valuables at home;
Car safes, wall safes, floor safes, drawer safes and cabinets are also available;
The safe is a side door safe with an independently installed board
Home Safe
Home Safe,Electronic Safe For Home,Home Safe Cabinet,Safe Locker
YONGFA INTELLIGENT TECHNOLOGY SECURITY CO., LTD. , http://www.yongfa-safe.com