Electronic potting glue is a widely used term for bonding, sealing, potting and coating protection of electronic components.Potting glue is liquid and liquid before curing. The viscosity of the glue is different according to the material, performance and production process of the product.After complete curing, it can realize its use value. After curing, it can play the role of waterproof, moisture-proof, dustproof, insulation, heat conduction, confidentiality, corrosion prevention, temperature resistance and shock resistance.At present, there are many kinds of electronic potting adhesives in the market. From the material type, the most common ones are mainly two kinds, namely epoxy resin potting adhesives and polyurethane potting adhesives.The selection of potting adhesives will directly affect the operation precision and timeliness of electronic products. How to choose potting adhesives suitable for enterprise products among many kinds of potting adhesives has become a technical difficulty.The following Xinjia silica gel to give you a specific analysis:
First, epoxy resin
Advantages: epoxy resin potting glue is more rigid, there are very few modified epoxy resin slightly soft.The greater advantage of the material is that the material has better adhesion and better insulation, and the curing material has good acid and alkaline resistance.Epoxy resin is generally resistant to temperature 100℃.Material can be used as transparent material, with good light transmittance.The price is relatively cheap.
Disadvantages: resistance to cold and heat change ability is weak, easy to produce cracks after cold and heat shock, resulting in water vapor from cracks into electronic components, moisture resistance is poor;After curing, the colloid hardness is higher and more brittle, higher mechanical stress is easy to strain electronic components;Epoxy resin can not be opened due to high hardness after potting and curing, so the product is a "lifetime" product, which can not be replaced.Transparent epoxy resin materials generally have poor weather resistance and are prone to yellowing under light or high temperature conditions.
Application: Generally used in LED, transformer, regulator, industrial electronics, relays, controllers, power modules and other non-precision electronic devices potting.
Two, polyurethane
Advantages: polyurethane potting glue has excellent low temperature resistance, the material is slightly soft, the general potting material has good adhesion, adhesion between epoxy resin and silicone.It has good waterproof, moisture-proof and insulation properties.
Disadvantages: poor resistance to high temperature and easy to bubble, must use vacuum defoaming;After curing, the colloidal surface is not smooth and poor toughness, anti-aging ability, earthquake resistance and ultraviolet light are very weak, colloidal easy to change color.
Application: It is generally used in the potting of electronic components with low calorific value.Transformer, anti-current coil, converter, capacitor, coil, inductor, rheostat, linear engine, fixed rotor, circuit board, LED, pump, etc.
With the great strides in the development of electronic science and technology, because of its many excellent performance, silicone rubber will undoubtedly become a better potting material for the protection of sensitive circuits and electronic devices.
Do you still want to know what kind of sealant advantages and differences, welcome to consult our Xinjia, we will give you a comprehensive answer.
