ED driver power potting glue is suitable for potting protection of general electronic components, power modules and circuit boards, as well as potting of various electronic appliances, such as switching power supply, driving power supply, automotive HID lamp module power supply, automotive ignition system module power supply. , home appliance controllers, network transformers, etc. Many customers don't know much about the operation method of LED driver power potting glue, so that the main agent after curing is too soft or the surface is too sticky. Now we will explain the specific operation of LED driver power potting glue. Method and related.

Handling of the issue:
1. Before mixing: A and B components should be fully stirred manually or mechanically to avoid performance changes due to sedimentation of the filler.
2. Mixing: Weigh the two parts in a 1:1 ratio and put them into a clean container. Stir well, the error should not exceed 3%, otherwise it will affect the performance after curing.
3. Defoaming: Natural defoaming: The uniformly mixed gel is allowed to stand for 20-30 minutes, vacuum defoaming: vacuum degree is 0.08-0.1 MPa, vacuum is taken for 5-10 minutes.
4, perfusion: the glue should be filled in the operation time, otherwise it will affect the leveling. The surface of the substrate is kept clean and dry before potting.
5, curing: room temperature or heat curing can be. The curing speed of the glue has a great relationship with the curing temperature. It takes a long time to cure in the winter. It is recommended to cure by heating. It is cured at 80 ° C for 15-30 minutes, and it usually takes about 6-8 hours to cure at room temperature.

Remember a friend who asked me before:Why do the main agent too soft when the two-component potting glue is cured, sometimes the surface is too sticky?

The first method: rapid curing at 60-80 ° C for 1-2 hours; if no further curing occurs, the possible reasons: the mixing ratio is not right or the main agent is not stirred evenly before mixing. If the main agent or curing agent reacts with other chemicals (such as solvents, strippers, greases or other incompletely cured base agents), this also affects the curing effect. After curing, it is only partially hard and leaves a very soft part; this can happen if the main agent and curing agent are not mixed evenly after mixing. Re-test, mix the main agent and the curing agent evenly to form a homogeneous mixture, then pour it into another cup and stir it for a while.

A customer asked me some time ago: Why do I sometimes have small bubbles sometimes appearing when I have a potting glue?

1. When stirring, due to the air entering, the air is not completely removed during the potting of the potting compound and the entire curing process, and small bubbles appear. In the case of such a problem, it is recommended that after the main agent and the curing agent are stirred together, the vacuum is applied or the potted product is also allowed to preheat during the potting of the product; Curing in a low humidity environment will allow enough time for the air to escape.
2. Because of the gas generated by the reaction of moisture and curing agent, large bubbles appear. In response to this problem, we first identify several possible causes of this problem:
(1) The main agent has been used many times, and moisture is mixed in each stirring process; it may also be because the lid of the package is not tightly closed. To prove what the cause is, mix the base and curing agent in a dry cup and dry in an oven (60-80 ° C) as described. If the bubble still occurs, the main agent has deteriorated at this time, please do not use it again.
(2) The potting product contains too much moisture. In case of such problems, it is recommended to re-test the product after preheating.
(3) The surface of the mixture of the main agent and the curing agent reacts with the moisture in the surrounding air. If this problem is encountered, it should be cured in a dry environment; if the product allows, it can be cured in an oven after heating.
(4) The liquid main agent and curing agent mixture may be exposed to other chemicals (such as solvents, release agents, varnishes, glues, etc.) before curing; such problems should be ensured to remove these substances before the next test. .

Next, explain some ways to change the performance of the main agent:
Curing time / operating time   The operating time of most polyurethane potting compounds is 1-45 minutes. In some cases the maximum operating time may vary. But don't try to change the operation time by adding curing agent. Weifu can adjust the operation time. For manual operation, the operation time is about 45 minutes, and the curing time is about 4-24 hours. This time depends mainly on the main agent in the product. Type, temperature and amount of glue applied.

Viscosity Do not change the viscosity by adding more or less curing agent. Viscosity can be changed by:
(1) A low viscosity curing agent will lower the viscosity of the mixture, but this will also change the mechanical and thermal properties of the cured polyurethane.
(2) Weifu can increase the viscosity by adding a thixotropic agent, which also helps to improve the stability and thixotropy of the liquid base and curing agent mixture without changing its mechanical and thermal properties. Hardness Do not attempt to change the hardness by adding too much base or curing agent as this will have a negative impact on the mechanical properties of the cured polyurethane. The hardness can be slightly changed by using another type of curing agent. If you need another grade of hardness, use a different base.