Condensation type power supply potting compound common problems and solutions

Power supply commonly used products are polyurethane, silicone epoxy resin will be used individually. At present, the common brands of power potting glue are Dow Corning, Huitian and Tianzhongshan. The common scheme is to add molding potting glue, but with the increase of customer requirements and the unique advantages of condensation potting glue, condensation potting glue is gradually accepted by customers. The following Tianzhong Xiaobian compiled the common problems of condensation type power potting glue for everyone.

Condensation Power Encapsulation Performance:

The cured product has excellent resistance to high and low temperature impact, weatherability, adhesion (sealing), shock resistance, and insulation properties.

The prone problems in the application:

1. The operation time is too long or too short;

2. Inhomogeneous mixing, resulting in partial curing;

3 glue pollution shell, etc., not easy to clean;

4. When heating is not complete, it is easy to foam expansion;

5.The component A is layered and layered, and it can easily cause changes in performance without stirring.

6. It can only be cured at room temperature and takes longer.

The main component of the 10:1 glue curing agent is organosiloxane, which has high hydrolytic activity and is easily hydrolyzed to produce white silica (the main component of quartz and wollastonite). Therefore, it is required that the glue be stored in a cool and dry place, and the curing agent should be kept open for as long as possible. If there is a large amount of precipitation of the curing agent or the container is broken, stop using it.

Display Potting Adhesive Problems and Solutions

First, the A component of the sedimentation layered, without stirring and easy to cause changes in performance.

main performance:

1.A bucket is opened on the surface and there is a colorless transparent silicone oil on the surface; (pigment and filler settlement)

2. The surface color is grayish; (pigment sedimentation)

3. According to the mixing ratio, the operation time is longer or even the surface is sticky; (filler settlement, the actual ratio changes)

4. Solidified product color grayish; (pigment sedimentation)

5. The cured product is brittle. (filler settlement, reduced colloidal strength)

solution:

Stir the A component before use, in particular stir it up and down, and make it even and even. It is recommended to use an electric mixer for stirring.

Second, uneven mixing, resulting in partial curing slow or not cured;

main performance:

1. At the same time, the glues that are dispensed at the same time have inconsistent curing time, some are cured faster, and some are cured for a long time.

2. After curing, there is a groove in the surface of the glue, and the glue in the groove does not solidify;

3. There is a local phenomenon of no curing;

solution:

Stirring is strengthened, and the stirring time is about 2-5 minutes, so that the glue is completely mixed. When using agitator, it is necessary to pay attention to whether it can stir all the rubber.

Third, after the curing of the contaminated plastic hard to clean up

main performance:

1. The shell is contaminated with glue and hard to clean after curing;

solution:

1. Pay attention to the operation when gluing, avoid contamination, clean before uncured;

Fourth, slow curing rate analysis:

1. The ratio is wrong, the amount of curing agent is too small;

2. The product is used across seasons, and the summer formula is put into use in winter;

3. The curing agent is hydrolyzed;

4. The curing agent exceeds the storage period;

5.A component is not stirred evenly, the use of the above part will slow down the curing rate;

6. The mixing process did not stir evenly and some of the curing speeds were slow.

Fifth, the curing speed is faster

1. The proportion of curing agent is not right, and the amount is too much;

2 mixed glue uneven;

3. The mixing time is too long and the temperature rises;

4. Operating environment temperature is high;