Industry dynamic

What is potting adhesive? What are the three most common types of sealants used in the electronics industry?

2021-01-05
Potting means that liquid polyurethane composite is mechanically or manually injected into the device with electronic components and circuits and solidified under normal temperature or heating conditions to become a thermosetting polymer insulating material with excellent properties.
Potting glue, also known as electronic glue, is mainly used for bonding, sealing, potting, and coating. Thus the electronic and electrical components have the moisture-proof, dust-proof, anti-corrosion, shockproof effect, and improve the performance and stability parameters, and it is liquid before vulcanization, easy to perfusion, easy to use.
Most of the current electronic products are potting silicone potting, polyurethane potting, and epoxy potting. Because these three kinds of glue can be chosen for different products. Its adhesion is very good, in the sealing waterproof is also very good. Here are the differences between the three types of potting sealants
Silicone pouring sealant
Long-term effective protection of sensitive circuits and electronic components is undoubtedly playing an increasingly important role in today's sophisticated and highly demanding electronic applications. Two-component silicone sealant is undoubtedly one of the best choices. Organosilicone potting material has stable dielectric insulation, which is an effective guarantee to prevent environmental pollution and can eliminate the stress caused by impact and vibration in a wide range of temperature and humidity.
Polyurethane potting sealant
Elastic polyurethane potting compound overcomes the commonly used the brittle epoxy resin and silicone resin, low intensity, the disadvantages of poor adhesion, excellent water resistance, heat resistance, cold resistance, resistance to ultraviolet radiation, acid and alkali resistance, high and low-temperature impact resistance, moisture-proof, environmental protection, high-cost performance, is the ideal electronic potting protection materials.
Epoxy resin pouring sealant
The epoxy potting adhesive has good fluidity and is easy to penetrate into the clearance of the product. It can be cured at room temperature or medium temperature with moderate curing speed. After curing, no bubbles, smooth surface, gloss, high hardness; Good acid and alkaline resistance, moisture-proof, waterproof, oil-proof and dust-proof, moisture and heat resistance and atmospheric aging; It has good electrical and physical properties of insulation, compression resistance, high bonding strength.
Among them, silicone potting sealant can be divided into the two-component condensed organosilicon potting sealant and two-component heat-conducting silicone potting sealant.
Condensed type potting sealant is transparent, black and white, widely used for potting protection of high-power electronic components, module power supply, circuit board and LED.

Molding heat conduction pot-sealant is gray, widely used in heat dissipation, flame retardant, high-temperature requirements of products such as automotive electronics, HID stabilizer, power module, sensor, circuit board, transformer, amplifier.