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Use of aluminum hydroxide in epoxy resin potting compounds

The function of potting material is to strengthen the integrity of electronic devices, improve the resistance to external shocks and vibrations; improve the insulation between internal components and circuits, which is beneficial to miniaturization and light weight of devices; avoid direct exposure of components and circuits, and improve device Waterproof and moisture resistant. It consists of a resin, a curing agent, a toughening agent, a filler

 

Fillers commonly used in epoxy potting materials are materials such as silica, alumina oxide , aluminum hydroxide, and magnesium hydroxide.

Both aluminum hydroxide and magnesium hydroxide are inorganic environmentally-friendly filled flame retardants. When heated (235 degrees of aluminum hydroxide, 325 degrees of magnesium hydroxide), water molecules are released to achieve the flame retardant effect of cooling and eliminating smoke meanwhile produced alumina and magnesia form a dense film to coat other substances, thereby isolating oxygen and functioning as a flame retardant. Therefore, the addition of this type of substance to the potting material has the dual effects of filling and flame retardancy, and the price is lower than that of alumina, which can reduce the product cost.

The aluminum hydroxide and magnesium hydroxide used in the potting compound require low oil absorption rate and uniform particle size. The laser particle size D50=15 micron is good, D90 should not exceed 40, otherwise the product is easy to precipitate, and the surface gloss is insufficient after curing.

Is it better to use aluminum hydroxide or magnesium hydroxide?

Adding aluminum hydroxide, the product has better fluidity and surface gloss, and the oil absorption rate is lower than that of magnesium hydroxide. The disadvantage is that the price is higher than magnesium hydroxide. The advantage of adding magnesium hydroxide is that the price is low, and other aspects are not as good as aluminum hydroxide. It is recommended for some small potting, then adding magnesium hydroxide; for large area potting, with aluminum hydroxide.

 

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