Potting compound potting process Potting glue operation process What to pay attention to when using potting glue

Potting compound potting process Potting glue operation process What to pay attention to when using potting glue

Potting compound is often used for bonding, sealing, potting or coating protection of electronic components, transformers or motor coils. The potting glue is liquid before curing, and the viscosity of the glue varies according to the components, dosage and production process of the product. The potting glue can realize its use value only after it is completely cured. When it comes to potting glue, do you know what potting means? What’s the process like? Let’s look down.

What is potting

Potting is to mechanically or manually pour a liquid compound into a device containing electronic components or circuits, and then solidify it into a thermosetting polymer thermally conductive insulating material with excellent performance under normal temperature or heating conditions. It can strengthen the integrity of electronic components and improve the resistance to external shock and vibration; improve the insulation between internal components and lines, which is conducive to the miniaturization and light weight of components; avoid direct exposure of components and lines, and improve the The waterproof and moisture-proof performance of the device improves the stability.

The quality of potting material products and the design of related product structures, the selection and assembly of some components are closely related to the potting materials used, but the potting process is often a factor that cannot be ignored.

Potting compound operation process

At present, the common methods of potting mainly include manual vacuum potting and mechanical vacuum potting, and mechanical vacuum potting can be divided into A and B components are mixed and deaerated first and then potted, and firstly deaerated and then mixed. Two cases are closed. In contrast, mechanical vacuum potting equipment has large investment and high maintenance costs, but it is obviously superior to manual vacuum potting process in terms of product consistency and reliability.

1、Manual vacuum potting process

  1. A & B part weighing and mixing
  2. Vacuum defoaming
  3. Specimen preheating
  4. Atmospheric pressure potting, vacuum defoaming
  5. Heat curing

2、Mechanical vacuum potting process: it is divided into A and B components, which are mixed and deaerated first and then potted;

(1) The A and B components are mixed and deaerated first and then the potting process:

  1. A & B part weighing and mixing
  2. Vacuum defoaming
  3. Specimen preheating
  4. Atmospheric pressure potting, vacuum defoaming
  5. Heat curing

(2) Process flow of mixed potting and encapsulation of components A and B after defoaming

  1. A & B part vacuum defoaming
  2. Weighing and mixing
  3. Specimen preheating
  4. Heat curing

As one of the protection methods for electronic products, the potting process plays the role of moisture-proof, mildew-proof and salt-fog resistance for electronic products, which increases the reliability of electronic products in harsh environments, and is irreplaceable for other protection processes. With the development of science and technology, potting materials are constantly being improved and updated, and potting materials with higher comprehensive performance are constantly being developed, and the potting process will also be used in a wider range of fields.

What to pay attention to when using potting compound

The potting structure and process of potting glue are not complicated, but you need to master the correct operation steps. Some users do not pay attention to the operation process and ignore many details, resulting in unsatisfactory curing effect. Therefore, the potting glue should be poured according to the following steps when using it, so that the potting glue can exert better performance.

1、Pay attention to the weighing ratio according to the weight ratio

Weigh the potting compound A component and the potting compound B component according to a certain weight ratio, and try to be as accurate as possible to reduce errors. Once the error is too large, it will affect the performance of the product. The quality of the selection also needs to be guaranteed, so that it is safer to use.

2、Be careful to operate in a specific temperature environment

The operating time is not only related to the product formula, but also mainly affected by the temperature. The high temperature will speed up the curing speed, and the operating time will be shortened accordingly. The low temperature will slow the curing speed, and the operating time will be extended accordingly.

3、Pay attention to the mixing technology

Some users will find that the potting compound cures less than ideally. It is not that there is a problem with the quality of the product, but that the skills are not mastered during the mixing process. When stirring, you need to use a professional stirring rod to stir at a uniform speed in one direction. Not too fast or too slow, just three minutes.

4、Do not forget to vacuum out air bubbles

Mixed and stirred components A and B of the potting glue can be directly poured or poured into the container to be cured, either at room temperature or by heating. If the potting height is thick and the appearance of the product after potting and curing is high, it can be vacuumized according to the situation to extract the air bubbles before potting.

5、Pay attention to the careful use of specific materials, chemicals, curing agents and plasticizers

Certain materials, chemicals, curing agents and plasticizers can hinder the curing of the potting compound, mainly including: organotin and other organometallic compounds containing organotin catalysts Silicone rubber sulfur, polysulfides, polysulfones or Other Sulfur-Containing Items Amine, Urethane or Amine-Containing Items Unsaturated Hydrocarbon Plasticizers Some Flux Residues.

6、The components A and B of the potting glue should be sealed and stored separately, so that they can be used and prepared immediately. The mixed rubber should be used up at one time to avoid waste.

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