As the name suggests, polyurethane potting glueIt is a kind of potting glue. When it comes to potting glue, there are three main types commonly used at present, namely epoxy potting glue, Organic siliconPotting glue, polyurethane potting glue . LearnBefore polyurethane potting glue, let’s talk about potting glue first. There are many types of potting glue, which can be divided into the three categories mentioned above in terms of material types. Potting glue made of these three materials can be subdivided into hundreds of products. Potting glue, also known as electronic glue, is a broad term mainly used for bonding, potting and coating protection of electronic components. Before curing, the potting glue is liquid and fluid. Potting glue‘s viscosity is based on product performance, original Differences in materials and production processesand vary. The use value of the potting glue can only be realized after it is completely cured. After curing, it can be waterproof, moisture-proof, dust-proof, insulating, hot, Seal , corrosion-resistant, temperature-resistant and shock-proof.
After introducing the potting glue, we begin to interpret the polyurethane potting glue. Polyurethane potting glue, also known asPUpotting glue, is generally two-component, divided into main agent and curing agent. The main components are polyvalent diisocyanate and polyether polyol, which are used in the catalyst (Triethylenediamine）crosslinking and solidification to form a polymer. PolyurethanePotting gluehas good bonding properties, insulation properties and weather resistance. Its hardness can be adjusted by adjusting the concentration of diisocyanate and polyether polyol. Proportion to change. The characteristic of polyurethane potting materials is that the hardness iscontrollable, moderate strength, good elasticity, water resistance, mildew proof, impact resistance, insulation and flame retardant Excellent resistance to electrical components, no corrosion to steel, aluminum, copper, tin, rubber, plastic, wood, etc.Materialhas good adhesion . The potting material can protect the installed and commissioned Good‘s electronic components are protected from vibration, corrosion, moisture and dust.
The application process of polyurethane potting glue is generally:
1. Preheating: The device to be poured please
font>60~80℃Bake1~2 hours,Remove device moisture;
2, mixing: weigh in proportionA, Bmaterial,Stir clockwise (or counterclockwise) in the same direction for 2~3minutes to minimize the mixing of air,Be sure to stir evenly at the bottom and edges of the container, otherwise there will be partial non-solidification.
3, defoaming: for potting The surface is required to be smooth and bubble-free, and the mixture should be vacuumed (≤-0.1Mpa) to remove bubbles smoothly, and mechanical measurement should be used. For those who mix potting, omit steps 2, 3 .
4, Pouring: Pour the mixture If the device has a complex structure or large volume, it should be poured in batches. The pouring bubbles can be purged with a hot air gun to eliminate surface bubbles.
5, solidification: 48~72h/ 23℃or 3~4h/ 60℃Can be cured, if the temperature is low, the curing time should be extended as appropriate;
6. Moisture and humidity will cause curing bubbles. It is recommended that the operating environment be controlled at 23±5℃, relative humidity<70%.
Elastic polyurethane pottingglueEpoxy resin potting glue that is different from the electronics industryand silicone potting glue, which overcomes the shortcomings of brittle epoxy resin and low strength of silicone resin. It has excellent water resistance, heat resistance, cold resistance, UV resistance, acid and alkali resistance, high and low temperature impact resistance, moisture resistance, environmental protection and high cost performance. It is an electronic component moreIdeal potting protective material. Polyurethane potting glue meets flame retardantV0level and environmental protection certification. It is used for circuit controllers and components in the electronics industry. Developed for long-term protection. Excellent insulation performance, Especially suitable for electronic circuit boards and components used in harsh environments（Such as moisture, vibration and corrosion), is suitable for various electronic components and microcomputer control boards Packages, such as pulse igniters, washing machine control boards, electric bicycle drive controllers, etc.
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