Potting glue, also known as electronic glue, is a wide name. Used for bonding, sealing, potting and coating protection of electronic components. The potting compound is liquid before uncured and has fluidity. The viscosity of the glue differs depending on the material, performance and production process of the product. The potting glue can be fully cured before it can realize its use value. After curing, it can be waterproof, dampproof, dustproof, insulated, heat conductive, confidential, anti-corrosive, temperature resistant and shockproof. There are many types of electronic potting glues. From the material types, the most common ones are the three most commonly used, namely epoxy resin potting glue, silicone resin potting glue, polyurethane potting glue, and these three materials. Potting glue can be subdivided into hundreds of different products.
Potting is a method in which a liquid polyurethane composite is mechanically or manually filled into a device equipped with electronic components and wires, and cured at room temperature or under heating to become a thermosetting polymer insulating material having excellent performance. Enhance the integrity of electronic devices, improve the resistance to external shocks and vibrations; improve the insulation between internal components and circuits, which is beneficial to miniaturization and light weight of devices; avoid direct exposure of components and circuits, and improve waterproof and moisture resistance of devices. .
   Epoxy potting compound has a wide range of applications, and the technical requirements vary widely. There are two types of curing conditions: room temperature curing and heat curing. There are two types of two components and one component from the dosage form.
   The room temperature curing epoxy potting compound is generally two-component, and can be cured without heating after potting, and has low requirements on equipment and is convenient to use. The disadvantage is that the composite has large viscosity, poor impregnation, short pot life, and is difficult to achieve automatic production, and the heat resistance and electrical properties of the cured product are not high. Generally used for low-voltage electronic device potting or not suitable for heat curing. Compared with the two-component heat curing potting compound, the outstanding advantage is that the required potting equipment is simple and convenient to use, and the quality of the potting glue has little dependence on equipment and process.
Heat curing two-component epoxy potting compound is the most widely used and widely used variety. The utility model has the advantages that the viscosity of the composite work is small, the processability is good, the application period is long, the impregnation property is good, and the comprehensive performance of the cured product is excellent, and the single-component epoxy potting material is suitable for the automatic production line of the high-voltage electronic device, which is a new development of foreign countries. Variety, heat curing.
   Room temperature vulcanized silicone rubber or silicone gel is used for potting of electrical and electronic components. It can protect against moisture, dust, corrosion and shock, and improve the performance and stability parameters. It is liquid before vulcanization and is easy to infuse. Easy to use. When silicone gel is used for potting, no low molecular weight, no stress shrinkage, deep vulcanization, no corrosion, transparent silica gel becomes transparent elastomer after vulcanization, and the components encapsulated in the adhesive layer are clearly visible. Use a needle to measure the component parameters one by one for easy detection and rework. There are also opaque gray or black, and the range of use is different.
   The room temperature vulcanized foamed silicone rubber is used in the memory magnetic core board of the electronic computer, and the tests such as vibration, impact, cold and heat alternating are fully met. The flame-resistant potting compound prepared on the basis of the addition of room temperature vulcanized silicone rubber is very effective for molding of products such as TV high-voltage caps and high-voltage cable sheaths. One-component room temperature vulcanized silicone rubber can be used as the surface coating protective material for the case where it is not required to be hermetically sealed or inconvenient to perform the impregnation and potting protection. The surface protection coating of general electronic components is performed by using room temperature vulcanized silicone rubber and internally coated with an addition silicone gel. Glass resin coated electronic appliances and instrument components are widely used.