Polyurethane potting glue concept and operation process

1. Introduction to polyurethane potting glue

As the name suggests, polyurethaneelectronic potting glueIt is a kind of potting glue. There are currently three most commonly used potting glues, namely epoxy resin potting glue, silicone resin potting glue, and polyurethane potting glue. Before reading about polyurethane potting glue, let’s talk about potting glue first. There are many types of potting glue, which can be divided into above according to the type of materialThree kinds, these three kinds of potting glue can be subdivided into hundreds of products. Potting glue, also known as electronic glue, is widely used for sealing, potting and coating protection of electronic components. Before curing, the potting glue is liquid and fluid. The viscosity of adhesives varies based on product properties, materials and production processes. 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, Heat, corrosion resistance, temperature resistance and shock resistance.

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. PolyurethaneirrigationSealing glue has good bonding properties, insulation properties and weather resistance. Its hardness can be changed by adjusting the content of diisocyanate and polyether polyol. Mainly used for polyurethane potting materials, with low hardness, moderate strength, good elasticity, water resistance, mildew resistance, impact resistance, transparency, excellent electrical insulation and flame retardancy, no corrosion to electrical components, and no corrosion to steel , aluminum, copper, tin and rubber, plastic, wood, etc. have good adhesion. Potting materials protect installed and commissioned electronic components and circuits from vibration, corrosion, moisture and dust.

2. Polyurethane potting glueIt is recommended to use craft

1. Preheating: The poured device should be baked at 60-80℃ 1~2hours,Remove Device moisture.

2, mixing: weigh in proportion A, BMaterial, Stir clockwise (or counterclockwise) in the same direction2~3minutes, Try to minimize the mixing of air, and pay attention to stirring 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℃or3~4h/60℃Can be cured, if the temperature is low, the curing time should be extended as appropriate.

6, moisture and humidity can cause Curing bubbles, the operating environment is recommended to be controlled at 23±5℃, relative humidity<70%.

3. Excellent performance of polyurethane potting glue

Polyurethane elastic potting material is different from epoxy resin potting glue and organic siliconResin potting glue, which overcomes the shortcomings of low-strength epoxy resin and poor adhesion 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 ideal potting protection material for electronic components. Polyurethane potting glue satisfies Flame retardantV0grade, environmentally friendly（SGS)certification, andROCH Certification,is a long-term certification for precision circuit controllers and components in the electronics industry developed for protection. Excellent electrical insulation properties,Especially suitable for sealing electronic circuit boards and components used in harsh environments（Such as moisture, vibration and corrosiveness). It is suitable for packaging of various electronic components and microcomputer control boards, such as Washing machine control panel, electric bicycle drive controller, etc.

Title of this article: Concept and operation process of polyurethane potting glue

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