The Common Problems About Acid Silicone Sealant

1. Why does some acid silicone sealant make aluminum discolor after curing?

When the acid glue is cured, it releases acetic acid, which is corrosive to metal materials. The reason why it can be used on aluminum is that the surface of aluminum is coated with an oxide film or coating, and there is a layer of coating for protection. Therefore, in general, the discoloration of aluminum is not a problem of glue, which involves more problems of construction operation and the quality of aluminum itself. The quality of aluminum mainly refers to the unqualified coating layer of aluminum coating, such as poor adhesion, too thin film layer, etc., will affect the color change after sizing; Improper construction can also cause discoloration. If the aluminum is placed in a poorly ventilated environment after sizing, the acetic acid released by the solidification of the glass glue can not be dispersed in time, the local concentration is too high, and the corrosion of the aluminum is discolored for a long time.

2. The adhesive strip will turn white or yellow after curing, why?

Yellowing: In more cases, the yellowing of the rubber strip is caused by the influence of other materials in contact with glass glue, the most common is the glass glue played on some black rubber strips (sealed between glass and aluminum), because some of the quality of the rubber strip is poor, contact with glass glue makes it yellow, even imported rubber is no exception. Under normal circumstances, the rubber strip changes the color of glass glue, and the reason may be the material used in the rubber strip, which is the reaction between the filler and the acid glue to make the transparent rubber change color; It does not exclude the addition of precipitated or volatile substances in the rubber strip, polluting the glass strip.

Whitening: The white of glass sealant is mainly due to too much filler added in the sealant; If occasionally there is a white situation, many times it appears in some projects where the glue layer is too thin, so it is recommended to increase the thickness of glass glue appropriately when sizing to avoid similar situations.

Does the cured hyaluronic acid strip turn white after stretching?

Because many acid glue add solid filler to increase strength, the solid filler shows white after stretching, so it looks white; This situation mostly appears in domestic glue, due to the cost of the use of solid fillers and imported glue has a certain difference, but the performance of the glass glue and the actual use has no impact.

3. Acid silicone sealant inside crystallization?

This phenomenon only occasionally appears, mainly caused by the storage temperature is too low, because the additives added to the acid glue system have many high freezing point, although the additives have been integrated into the glue, but at a long time at low temperature will still be re-crystallized and precipitated, so the storage temperature to avoid too low.

4. Why the acid sealant extrusion process will break or small bubbles?

Storage temperature is too low: If it is acid glue (especially low-grade glue) stored at a lower temperature will form a lot of bubbles. The reason may be that after low temperature storage, the liquid raw material changes due to the shrinkage volume and forms more bubbles, so it is recommended that the storage temperature should not be lower than 0℃.

Formation in the canning process: in normal canning, there are often a small number of small bubbles in the tail of the loading glue, which is difficult to avoid in the current mode of operation, and will not have a substantial impact on the use: if there are more bubbles or flow interruption (large bubbles), it is caused by improper operation, which must be improved and should be avoided. However, this situation also has the probability of occurrence, if the phenomenon is rare or occasionally, it should be regarded as a chance event. Large bubbles should be avoided during operation.

5. Why does the acid glue bottle grow tall or have oil in the bottle after storage for a period of time?

There are two reasons for this problem, that is, it is related to the glue and the glue bottle.

First, the reason for the glue. The acidic glue on the market now, in addition to a few high-grade glue, other acidic glue are different degrees of adding a certain amount of filler to reduce costs, and the lower the grade of the glue, the more the amount of filler added, and the filler will react with the glue bottle, so that the glue bottle is tall, deformed and the bottle has oil; If high-grade glue may make the glue bottle react after 6 months, the relatively low-grade glue may react after 6 months.

Second, the glue bottle reason. The quality of the material of the plastic bottle itself is also the reason for the growth of height, the raw materials used in the bottle are also good and bad, the raw materials used are good, the trend of change of the plastic bottle is relatively slow. Such as good quality plastic bottles, loaded with high-grade plastic can be stored for 7-8 months without reaction; On the contrary, the use of poor quality plastic bottles, even if the better glue may be deformed in 2-3 months.