How to choose the article LED lights pouring sealant material?

with the popularity of article LED lights and the enlargement of market capacity, choose a suitable LED soft light with potting glue for many article LED lights manufacturers one of the most headache problem. Pouring sealant chosen the right was made. It is reported that there are on the market at present (pu) pouring sealant was potting glue, epoxy resin and silicone potting glue three pouring sealant.

among them, although epoxy pouring sealant has good light transmittance and good stacking effect, can make the article LED soft light appearance after curing light, radian fruity. But it can only be - Use within 50 c to 550 c, easy to appear when in the high temperature toughness variation, a lot of times when more than 600 c, soft article lamp in softening, colloid prone to fracture cause; At the same time, the temperature is below - When 50 c, colloid harden brittle, article lamp slightly shaking will appear colloid stripping and embrittlement fracture phenomenon; Lamp bead light 400 - for a long time After 700 hours, the lamp bead at the top of the epoxy resin colloid to brown, falling light brightness and color temperature changes.

the light transmittance of polyurethane pouring sealant in the 85 - 92%, after curing light bar has good flexibility, colloid can be in - after curing Use for a long time between 250 c to 950 c; But because of the pu gel hardness can't is low, the product can only be applied to a glue type or half sleeve type soft article lamp. With lower temperature, the light of a larger flexibility of change; Potting, surface and environment humidity requirements of FPC is higher, if the humidity is too big, product surface prone to white fog and the phenomenon of adhesion strength is not enough; Used outdoors for a long time, usually 2 - colloid Three years appear yellowing phenomenon.

silicone potting glue is one of the most popular on the market at present potting glue, the cured gel hardness is adjustable, can be made into jelly type shoreA30 degrees of gel can also make it harder glue, so the silicone potting glue can be used to glue type article lamp, can also be used in a half sleeve type article lamp, can also be used for the whole article sleeve type lamp, colloid can be in - after curing Use between 450 c to 2000 c, and as the change of temperature, mechanical and physical properties of the product and no obvious change of optical performance is very suitable for cold regions such as Russia, northern Europe, North America. In addition, the silicone potting glue article lamp, ozone, ultraviolet radiation, acid and alkali resistance is better, can stay for a long time outdoor use yellowing; But the silicone potting glue is lower than that of epoxy, adhesion and FPC tall sex slightly low defects.