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Power adapter filling and glue requirements
time2019/05/11
- Power adapter glue and glue requirements are waterproof, thermal conductivity, insulation strength, environmental protection, flame retardant requirements. As for the other parameters, you have to fill it yourself.
Power adapter glue and glue requirements, this is simple to say, it may be that the customer asks for glue, it may be that others are looking for glue in the glue. To be sure, there are several major purposes and requirements for potting:
1. Waterproof, potting glue will tightly wrap the electrical part of the whole power adapter and completely isolate it from the outside world; what water, moisture, acid and alkali salt can not meet the circuit components, can improve the waterproof, moisture and corrosion resistance. Therefore, the glue you choose should have good fluidity. If the fluidity is not good, how can it be deeply penetrated and completely sealed? Then the adhesive force should be provided. Otherwise, the hot and cold alternately with the components after the potting is not used, the power adapter Life performance is also affected.
2, thermal conductivity, power adapter is a power product, is the conversion, control, outward output energy. The adapter works hot, such as switch tubes, transformers, electrolytic capacitors, inductors, etc. Which are not heat-emitting devices and are afraid of heat devices, what should I do? It is necessary to conduct the heat as soon as possible and conduct as much as possible. Therefore, the glue definitely requires good thermal conductivity. It can be said that the higher the thermal conductivity of the rubber, the better. Filling a good thermal conductivity glue can put each component on the outside to dissipate heat, which not only improves life but also simplifies design.
3, insulation strength, this is easy to handle. Basically all of the glue is not electrically conductive, but it should be noted that the curing reaction of the AB glue like epoxy may not be completely conductive. Also, in order to save sand in it, it is hard to say. First, is your sand processed by dehydration treatment, or is it that your sand will interfere with curing by other elements; whether the ratio of the AB agent is reasonable, whether the mixture is sufficiently uniform, and whether other conditions are available.
4, environmental requirements, adapters have generally been certified. It depends on whether the products provided are consistent with the certification. The price difference between environmentally friendly and non-environmental materials is still quite a lot.
5, flame retardant requirements, generally look at the flame retardant test in UL. Generally required 94-V0 or more.
6, other parameters are more, you have to fill it yourself. The main thing is that your supplier should be constant, his supply should be stable, and the process should be stable. Otherwise the dispersion is too large.