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Hollow glass secondary sealant used improper hazards

Hollow glass secondary sealant used improper hazards

- "Iridescent" phenomenon and "oil flow" phenomenon
In the previous issue, “White Cloud Online” answered how to correctly select the hollow glass secondary sealant to share the importance of insulating glass secondary sealant. Hollow glass sealant has a great influence on the quality and service life of insulating glass. Hollow glass structural sealant is even directly related to curtain wall safety issues. Therefore, we must choose the right product for the product.

 

Insulating glass second sealant improper use will cause what problems? “Baiyun Online” expert group summarized the problems caused by the improper use of the second sealant, and can be divided into the following two categories: one is the loss of the function of the hollow glass, which means that the original function of the insulating glass is lost; the other involves The safety problem of insulating glass applications is that the outer sheet of the insulating glass falls. Regarding the first type of problem, this issue of “Baiyun Online” has caused serious loss of function of insulating glass for hollow glass secondary sealant filled with mineral oil, and has collected some cases for sharing.


Case 1: Insulating glass "iridescence" phenomenon.

 

 

Hollow glass as a whole of the curtain wall of a project

 

  Shortly after the completion of a project, the hollow glass exhibited an iridescent phenomenon.

 

 

"Iridescent" phenomenon Insulating glass

 

A partial enlargement of the hollow glass of the “iridescence” phenomenon of a certain project.

 

The migration of the oil trace at the interface of the hollow glass cavity can be seen from the figure above.

Case 2: Insulating glass “oil flow” phenomenon

 

 

The phenomenon of "oil flow" in hollow glass

 

A black oil spot appears on the upper part of the insulating glass shown in the figure above, and there is a noticeable grease on the lower part of the oil spot.

 

The “bizarre” phenomenon in the above two cases is that the second sealant used in the insulating glass is filled with mineral oil, and the mineral oil is commonly called white oil. It is an alkane material and has poor compatibility with the silicone sealant after a certain period of time. Will migrate, seep out.

 

The "iridescence" phenomenon is caused by the migration of mineral oil into the hollow glass interior. The reason for the phenomenon of “oil flow” is the migration of mineral oil, which dissolves the hollow glass and seals the butyl rubber, resulting in black oil spots or traces of oil.

 

At present, the market is fiercely competitive, and some manufacturers have to sacrifice their product performance and quality in order to win customers at low prices. Some low-quality and low-priced products have appeared on the market. Insulating glass sealant filled with mineral oil is a “very effective” method for the bad manufacturers to reduce the production cost of insulating glass sealants. Because the silicone base polymer accounts for a large proportion of the cost of the silicone sealant, reducing the silicone base polymer content can reduce the cost; the bad manufacturer replaces the silicone base polymer with part of the low-priced mineral oil, and at the same time, the mineral Oil also significantly reduces the viscosity of the sealant, so the formulation can be heavily filled with filler to further reduce the silicone base polymer content. If the content of the silicone base polymer decreases, the durability of the silicone adhesive will inevitably decrease. At the same time, the use of "oil-filled rubber" followed by the migration of mineral oil inside the hollow glass has a great negative impact on the sealing performance of a butyl rubber, which can cause premature failure of the hollow glass. For example, “oil-filled rubber” is used for the bonding of hollow glass structures, which poses a huge safety risk to curtain walls. In this "Baiyun Online" appeal to everyone must reject "oil-filled plastic."

 

In this issue, “Baiyun Online” shared some cases of severe phenomena in the use of hollow glass secondary sealant filled with mineral oil. The next issue of “Baiyun Online” will continue to answer if the use of hollow glass secondary sealant caused improper use of insulating glass loss of other phenomena, so stay tuned!