There are many types of silicone potting adhesive, different types of silicone potting adhesive in the temperature performance, waterproof performance, insulation performance, optical performance, adhesion performance of different materials and soft and hard and other aspects have great differences. Silicone potting glue can be added with some functional fillers to give it conductive, thermal and magnetic properties. The mechanical strength of silicone potting glue is generally poor, and it is just by borrowing this performance that it can reach "pry open" for maintenance, that is, if a component is faulty, only need to pry open the potting glue, replace the new original, can continue to use. The color of silicone potting glue can be adjusted according to the need. Transparent or opaque or colored. Silicone potting adhesive in shock performance, electrical performance, waterproof performance, high and low temperature resistance, anti aging performance and other aspects are very good.
Two - group silicone potting adhesive is the most common, including condensation type and additive type. The general condensation type has poor adhesion to components and potting cavity, and volatile low-molecular substances will be produced in the curing process, and the shrinkage rate is obvious after curing. The additive (also called silicone gel) has minimal shrinkage and no low molecules are generated during curing. It can be heated to cure quickly.
Polyurethane potting adhesive
PU potting glue and PU potting glue, usually by poly vinegar, polyether and poly diolefin oligomer polyol and diisocyanate, diol or binary amine as chain extender, after step by step polymerization. Potting adhesive can usually be prepared by prepolymer method and one-step process.
The characteristics of polyurethane sealing materials are low hardness, moderate strength, good elasticity, water resistance, mildew prevention, shockproof, transparent, excellent electrical insulation and flame resistance, no corrosion of electrical components, steel, aluminum, copper, tin and other metals, as well as rubber, plastic, wood and other materials have good adhesion. Potting materials protect installed and adjusted electronic components and circuits from vibration, corrosion, moisture and dust.
LED potting glue
LED potting glue is a kind of LED packaging material, with high refractive index and high light transmittance, can play a role in protecting LED chip to increase the light flux of LED, small viscosity, easy defoaming, suitable for potting and molding, so that LED has good durability and reliability.