Potting glue is a kind of composite material that is liquid before curing, has certain fluidity, and solidifies under certain time, heating or other conditions to form an elastomer. Its main function is to be used for bonding, sealing, potting, and coating protection of electronic components, and to play the role of waterproof, moisture-proof, dust-proof, corrosion-proof, and shock-proof. With the development of the electronic and electrical industry, potting adhesives have also been more and more widely used.
In recent years, with the development of the electronic and electrical industry, people have paid more attention to the stability of products. In order to protect electronic products from the erosion of the natural environment and prolong their service life, more stringent requirements have been put on the weather resistance, heat dissipation, and earthquake resistance and water resistance of electronic appliances. stringent requirements. The basic characteristics of silicone potting compound are most suitable for the performance required by electronic appliances. Therefore, silicone potting compound has been used more and more in the industry, and has been recognized by more and more customers.
However, silicone potting adhesives are divided into single and double components according to the packaging form, and are divided into ordinary potting adhesives and heat-conducting potting adhesives according to product characteristics. With so many differentiating categories, users will inevitably be dazzled and at a loss as to what to do. How to choose a suitable silicone potting compound has become a big problem for users.
One- and Two-Component Potting Compounds
The advantage of one-component potting glue is that it is convenient for construction and does not require large investment in equipment. However, because the curing of the one-component potting glue is from the surface to the inside, there is a problem of slow curing for the glue point with a large potting depth, which leads to a longer construction period.
The two-component potting glue requires professional glue mixing equipment for sizing. The curing speed is fast, and the elastomer can be formed in a short time, which is more suitable for continuous production in the workshop. Therefore, most factories use two-component potting glue.
Ordinary potting compound and heat conduction potting compound
Ordinary potting adhesives have a thermal conductivity of 0.2W/(m·K) and have good fluidity. They are mainly used for covering and positioning of components, and play the role of shockproof, waterproof, and dustproof.
Thermally conductive potting adhesive is a product modified by adding thermally conductive fillers on the basis of ordinary potting adhesives. The thermal conductivity is generally above 0.4 W/(m·K), and can even reach 1.5 W/(m·K). However, as the thermal conductivity increases, the fluidity of the potting compound also shows a downward trend. Thermally conductive potting adhesives are mainly used for potting and sealing protection of power supplies that require high heat dissipation. When selecting thermally conductive potting adhesives, there are generally requirements for the flame retardant performance of the product, and the flame retardant grade of the product is required to reach V-1 or above. It has a good flame retardant and heat conduction effect, and ensures the safety of power supply products.
