1.Silicone sealant has poor adhesion to some building materials (such as aluminum, aluminum-plastic plate, plastic steel, etc.).

This phenomenon is explained in two sentences “the diversity of building materials and the instability of sealant".

First of all, the diversity of building materials: there are many kinds of building materials on the market, such as sprayed aluminum and anodized aluminum. Spraying aluminum is also divided into electrophoresis, fluorocarbon and other coatings, with different surface properties. Therefore, it is necessary to know the advantages and disadvantages of adhesion through experiments. The general raw material of plastic steel profile is PVC (polyvinyl chloride), and plasticizer and filler are also added. However, there are many manufacturers and different materials, so there is also great uncertainty.

Moreover, the instability of sealant: as a chemical product, many factors affecting the quality cannot be directly observed. We will also find that sometimes there is poor adhesion from the previous test results; This also requires us to conduct compatibility test before construction.

Note: the non stick materials of customers are actually related to the diversity of building materials.

2.  Neutral transparent (ketoxime type) will also turn yellow or even red after curing.

The yellowing of neutral transparent glue is due to the defects of the glue itself, which is mainly caused by the crosslinking agent and tackifier in the neutral glue. The reason is that these two raw materials contain "amino" and "vinyl". Amino and vinyl are very easy to cause yellowing. Therefore, many imported famous brand glass adhesives also turn yellow. In addition, if neutral transparent adhesive is used together with acid glass adhesive, it may turn yellow after curing; It may also be caused by the long storage time of the glue or the reaction between the glue and the substrate.

Ketoxime transparent will turn yellow in varying degrees after curing for about 20 days. The yellowing trend will intensify with the increase of time

Here, the yellowing of ketoxime adhesive is not a problem in individual factories, but a problem in the whole industry of a product, including foreign manufacturers. Although yellowing is an inherent defect of current products, the curing environment also has a great impact on yellowing. First, ketoxime adhesive can not coexist peacefully with acid adhesive. It doesn't take three days to beat them together, and ketoxime adhesive will seriously turn yellow, That is, ketoxime acid intolerance; In addition, placing the cured ketoxime adhesive in a dark and humid corner will also make it turn yellow until it turns red.

3. Is there any chemical reaction when neutral glue is mixed with silica gel glue from other factories?

If the silica gel of other factories has been completely cured, generally no chemical reaction will occur again; If the silica gel of other factories has not been cured and mixed with the adhesive of our company, chemical reaction will occur. It is not recommended to mix the silicone adhesive of different manufacturers.

4.  If you accidentally get the glue on the glass, what can you use to clean it?

If the glue is not cured, wipe the cloth strip quickly: if the glue is cured, you can only scrape the glue away with a knife.

5.  What is the best temperature for construction?

The construction environment shall be well lit and clean. The best environmental conditions for construction are: temperature 15 ℃ ~ 27 ℃, relative humidity 40% ~ 80%. Even if the above conditions are not met, the temperature of 4C ~ 40 ℃ and the relative humidity of not less than 30% shall not be exceeded. Construction cannot be carried out when it rains or snows.