SMD processing adhesive is also known as SMD processing red glue, usually red (also yellow or white) paste in a uniform distribution of hardener, pigment, solvent and other adhesives, mainly used to SMD processing components fixed in the printed board, generally with a dot glue or stencil printing method to distribute. After affixing the components into the oven or reflow oven to heat hardening.
The difference between thermally conductive potting encapsulant and thermally grease
Generally speaking, the thermal conductivity silicone grease with the larger thermal conductivity coefficient is coated with the same thickness of thermal grease, the smaller the thermal resistance, the better the thermal conductivity.
The method is very simple is to put the pencil lead into the milky white thermal conductive silica gel grinding, grinding and thermal conductive silica gel mix, such as grinding bad after a certain level, the thermal paste will turn black and grey, then high purity graphite thermal conductive silica gel is made. But to pay attention to one point, in the whole process of making to pay attention to the strength of the grinding pencil, or pencil core particles are very large in turn will affect the actual effect of heat transfer. The same principle of putting creamy heat dissipation paste into the middle of two pieces of aluminium rubbing can also be made of aluminium heat-conducting silicone. In addition, the guys can also try to make their own preservatives for other raw materials, such as tin, copper, etc.
SMT red glue has viscosity fluidity, temperature characteristics, wetting characteristics, etc.. According to this characteristic of red glue, so in production, the purpose of using red glue is to make the parts firmly attached to the PCB surface to prevent it from falling off.
According to the weight, mix it with the ratio of A:B=1:1 and then mix it well. Note that in order to ensure the good performance of the product, A component and B component in the 1:1 mixture before, need to be fully mixed, and then weighed and sampled for the ratio, and then the rubber with a good mix before the gluing and potting.
