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Epoxy resin cures heat and damages electronic components, try liquid silicone?

Date:2020-03-31

Epoxy resin is a general term for a class of polymers containing two or more epoxy groups in the molecule. Because of its low price, good modification ability, good insulation performance and good surface properties, it is well received by consumers.
What is liquid silicone rubber?

 

Silicone (Silica gel; Silica) alias: Silicic acid gel is a highly active adsorbent material, which is an amorphous substance with a chemical molecular formula of mSiO2·nH2O; it does not react with any substance except strong alkali and hydrofluoric acid. Insoluble in water and any solvent, non-toxic and tasteless, chemically stable. In terms of material form, according to people's different uses, a kind of silica gel was produced, and the silica gel was electronically potted.

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So compared to the epoxy potting electrical components, liquid silicone potting shows his advantages and market.

 

1 The line shrinkage is small, with a minimum of 0.1%. After the liquid substance solidifies into a solid substance, the shrinkage between the silica gel molecules is almost small as the temperature changes. Then for electronic components LED circuit boards, LCD screens, due to its excellent line shrinkage, electronic components are 100% perfect protection. On the contrary, the influence of the linear shrinkage performance of the resin with the change of the environment will lead to the exposure of the components, which is not worth the loss.

2 Does not exotherm during curing, and has minimal stress on electronic components. Many customers often damage electronic components because of the heat of curing of the resin. The temperature of the electronic components can not be very high, which requires a higher level of material for better application. Silica gel can be cured at room temperature without any damage to electronic components. It can be seen that the influence of the reaction by-products of the substance on the product is also enormous.

3 Not easy to crack. Due to the excellent curing characteristics of silica gel, it is resistant to high and low temperature, weathering, ozone, water, flame retardant, non-toxic, non-corrosive and physiologically inert. It has good resistance to cold and heat shock and withstands heat and heat of -60 °C-200 °C. Impact, no cracking, maintain elasticity, strong sealing performance, excellent moisture/waterproof performance, elastic body after curing, good impact resistance, UV resistance and weather resistance, etc., so the time for silicone potting protects components long.

4 The thermal conductivity after curing is higher. The thermal conductivity of the resin after curing is very low, only 0.3w/m.K to 0.6w/m.K. When the electronic device is working, the temperature of the electronic component rises and is easy to expand, which is easily damaged by the action of stress, is not resistant to low temperature, and is highly toxic. The thermal conductivity of the transparent potting compound is about 0.17~0.37, the thermal conductivity of black/white/ash is about 0.6~0.8 (adding heat conductive material), and the other is about 1-4.0. Therefore, for some components with high thermal conductivity requirements, silicone is your best choice.

5 Repairability is very good. The repairability of the resin is very poor. If the resin is cracked for a long time, it is a problem to clean the resin without damaging the electronic components.

6 Environmental FDA. With the improvement of people's living standards, the requirements for environmentally friendly materials are getting higher and higher. The toxicity of the resin itself makes silicone more and more important.

So, if you want to try silica gel, you may want to search for the following keywords:

Engine control module silicone potting, ignition coil and ignition module silicone potting, power system module silicone potting, brake system module silicone potting, exhaust emission control module silicone potting, power system silicone potting, lighting system silicone irrigation Sealing, various sensor silicone potting, connector silicone potting, integrated circuit silicone potting, micro-membrane component silicone potting, thick film component silicone potting, electronic assembly silicone potting or whole machine for potting, glue layer Inner component silicone potting and so on.

TypeInfo: Silicone Usage

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