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What can we do when silicone potting sealant does not cure?

2021-01-06
The use of potting glue sometimes does not solidify the phenomenon, and this phenomenon is known as the potting glue poisoning phenomenon. What are the reasons for silicone potting sealant poisoning and not curing? Today, let's talk about the causes and solutions of this phenomenon.
Analysis of the cause of poisoning and non-curing of silicone potting sealant
The first reason: may be due to the error of measuring instruments or human factors caused by the glue proportion error.
The second reason: the product has exceeded or is close to the shelf life, resulting in failure or loss of efficiency or improper storage of the catalyst in the product caused by failure or loss of efficiency.
A third reason: when using the environment containing phosphorus, sulfur, nitrogen, and other organic compounds, and alkynes and more vinyl compounds or Sn, Pb, Hg, As and other elements of ionic compounds, a two-component and molding silicone potting contact more than a certain amount of compound will have an inhibitory effect on adhesive curing reaction, the colloid not cure or cure.
The fourth reason: the use of polyurethane, epoxy resin, unsaturated polyester, condensation type room temperature vulcanized silicone rubber, and other products at the same time with silica gel.
The fifth reason: curing temperature is not enough or time is not enough to cause the curing is not complete.
The sixth reason: internal direct contact, such as the circuit board contains not clean rosin flux, etc., or the plasticizer used in the sealing glue contact insulating plastic contains toxic substances, will occur in the contact part of the curing or curing is incomplete.
What are the solutions to potting sealant poisoning and curing
1. Completely and accurately distribute the ratio.
2, the container must be clean, it is best to use a glass container.
3. Mix well.
4, use according to the storage period, no expired potting glue.
5, pay attention to the temperature and humidity, if necessary, heating and curing.
6, the use of molding sealing glue should avoid contact with organic compounds containing phosphorus, sulfur, nitrogen, or with molding silicone at the same time using polyurethane, epoxy resin, unsaturated polyester, condensation type room temperature vulcanized silicone rubber, and other products, to prevent the occurrence of poisoning and curing phenomenon.

Above in order to solve the last question, general silicone potting glue will join in the resistance to agents in the colloid, joined the resistance agent in the organic silicon potting glue, no longer by sulfur, phosphorus, nitrogen and the influence of materials such as tin, and had no effect on there, can be more widely applicable to all kinds of electronic components, have the effect of waterproof sealing, thermal conductivity, flame retardant.