Industry dynamic

The difference between organosilicon plus forming potting sealant and condensation potting sealant

2021-01-06
Silicone potting sealant is divided into a single component and two-component potting sealant according to the main material and additives and can be divided into condensation type and molding potting sealant according to the curing reaction. So today we're going to talk about the difference between silicone potting and condensation.
In general, the waterproof potting glue is condensed, and the formed potting glue is generally used for heat conduction potting. Condition type potting glue shrinkage is severe, at the same time, it will release a certain amount of alcohol, curing time is also very long, so adding molding is more environmentally friendly, adding molding potting glue can do food-grade, can be heated curing or room temperature curing.
What is silicone condensed potting sealant?
Silicone condensation type sealant is a kind of silicone rubber cured by moisture in the air and mixed catalyst. The curing time mainly depends on the amount of catalyst. The more the amount of catalyst, the faster the curing speed will be. However, the curing process will shrink and a by-product is released.
Add molding silicone potting glue and compared with the traditional type of condensation potting silicone rubber, vulcanizing process by-products produced no small molecules, crosslinking structure is easy to control, sulfide product shrinkage of small, superior product performance, can be at room temperature curing, but also under the condition of heat vulcanization, deep and fast curing, products with good performance, low viscosity, good fluidity, pouring, pumping and static mixing are available, and possesses the advantages of process simplified, fast and high efficiency and energy saving. Therefore, it has developed rapidly since its appearance and has a tendency to replace condensed silicone potting materials.
What is silicone plus molding potting glue?
Add molding potting sealant to use curing agent, curing process will not produce any by-products. Once a curing agent is added, they solidify on their own, even in an airtight container that does not need to be opened to the atmosphere. Silicone two-component plus molding potting sealant can be cured at room temperature if necessary can also be heated to speed up the curing speed, and the cured colloid will not have any adverse effects. Single component plus molded silica gel usually requires heat curing.
At the same time, attention should be paid to the uncured adhesive in the mixing process or production process should avoid contact with the following chemicals: nitrogen, sulfur, phosphorus, arsenic, organic tin curing agent, stabilizer, epoxy resin curing agent, vulcanized rubber and condensation silica gel, otherwise, it will inhibit curing lead to curing is not complete.
Silicone plus molding potting sealant also requires good chemical balance to achieve the appropriate physical properties of the cured colloid. So both components should be thoroughly stirred before weighing them out. It is also important to get the mix right. Mixing two batches of glue is not recommended because it is usually manufactured in a set.
The difference between silicone molding potting sealant and condensation potting sealant

The biggest difference between them is that the condensed version produces small molecules, while the additive version does not, and this determines the difference in their performance. Thermal pouring sealant and molding pouring sealant has also been a potting waterproof a difficult problem, at the same time easy to poisoning (curing glue not dry or slow) curing, curing agent and chemical compounds such as S, P, N is very easy to reach, in spite of this, the advantages of organic silicon and molding pouring sealant too obvious, gel strength, no corrosion, no shrinkage, good electric insulation performance.