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What are the factors that cause abnormal curing of silicone encapsulant?


Silicone encapsulant can effectively protect electronic equipment products, and play the role of waterproof, moisture-proof, dust-proof, insulation, thermal conductivity, and anti-corrosion. There are two ways to cure silicone potting adhesive: room temperature curing and heating curing. If the phenomenon of silicone potting adhesive is not cured, what factors will cause it?


1.  Proportioning problems    

Human factors or the errors of measuring tools cause the wrong proportion of glue. The larger the proportion of A and B components to glue, the more we need to pay attention to the accuracy of the weighing and the accuracy of the electronic scale. For example, A:B = 10:1 products, the B component control weight should be more accurate.

2.  Curing temperature

The decrease in curing temperature is also a factor that causes the curing speed of silicone potting adhesive to slow down. What is more affected is the time that affects the receipt time or the time to enter the next process. Especially for users without heating conditions, it is necessary to avoid that winter cooling causes curing to slow down the situation, pay attention to good receipt time or control the time to do the next process.


3.  Poisoning

The use of the environment there are factors that make the catalyst poisoning, such as organic compounds containing phosphorus, sulfur, nitrogen, or with the addition of silica gel at the same time using polyurethane, epoxy resin, unsaturated polyester, condensation type room temperature vulcanization silicone rubber and other products, will lead to catalyst catalytic activity decline, in serious cases, direct failure, can not be cured is still a liquid state, so choose to use silicone potting adhesive products first their own products can not contain the above material components.


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