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How much do you know about silicone sealant?

Aug 06,2020 | Views: 702

SILICONE SEALANT is a part of SILICONE .It is mainly divided into deacetic acid type, dealcohol type, deammonia type and deoxime type. Glass glue is the common name of silicone sealant, because users buy silicone sealant mainly used in the bonding and sealing of glass, so it is called glass glue. The chemical composition of polydimethylsiloxane, silicon dioxide polymers can be called silicone. Silicone sealant is a kind of ointment that solidifies into a tough rubber-like solid material once it comes into contact with water in the air.


First.Classification of silicone sealant


One component and two components.


A one-component silicone sealant whose solidification is caused by a change in physical properties due to contact with moisture in the air;


Two-component means that silicone sealant is divided into two groups, A and B. Any of the two groups alone cannot form curing, but once the two groups of glue are mixed, curing will occur.


One component silicone glass glue is common in the market. One - component silicone glass glue is divided into acetic sealant and neutral sealant according to their properties. Acetic sealant is mainly used for general bonding between glass and other building materials. And the neutral sealant overcame the acetic sealant corrosion metal materials and alkaline materials reaction characteristics, so the scope of application is wider, its market price is slightly higher than acid gum. A special kind of glass glue on the market is silicone structure sealant, because it is directly used in the metal and glass structure of glass curtain wall or non-structural bonding assembly, so the quality requirements and product grade is the highest in glass glue, its market price is also the highest.


1. Mainly used for metal and glass structural or non-structural adhesive assembly of glass curtain wall.


2. It can connect the glass directly with the surface of the metal component to form a single assembly component, so as to meet the design requirements of the curtain wall with full or semi-hidden frame.


3. Structural adhesive sealing of insulating glass.



Second.The use of silicone sealant


1. Use: One-component silicone sealant can be used immediately. It is easy to punch it out of the bottle with a rubber gun, and the surface can be trimmed with spatula or wood chips.


2. sticking to the time: silicone sealant curing process is from the surface to inner development, different characteristics of the silicone table dry time and curing time is different (details please refer to the fourth article of curing time of the technical parameters of content), so if you want to repair was carried out on the surface must be conducted before the glass glue dry table (acid gel, neutral cellophane tape shall generally be in 5 to 10 minutes, neutral mixed glue shall generally be in 30 minutes). If you use colored paper to cover a certain area, after gluing, be sure to remove the skin before it forms.


3.Curing time: The curing time of glass glue increases with the increase of adhesion thickness. For example, acetic silicone sealant with a thickness of 12mm May take 3-4 days to solidify, but the outer layer of 3mm has been solidified within about 24 hours. When bonded to glass, metal, or most wood, it has a 20 pound/inch peel strength after 72 hours at room temperature. If the place that USES glass glue is partly or completely closed, so, cure time is decided by airtight degree. In an absolutely sealed place, it is possible to remain uncured forever. If the temperature is raised, the glass glue will become soft. The gap between metal and metal bonding surface should not exceed 25mm. In all kinds of bonding occasions, including under closed conditions, the bonding effect should be thoroughly checked before the use of the bonded equipment. During the curing process, acid glass glue will produce a smell due to the evaporation of acetic acid, which will disappear in the curing process, and there will be no peculiar smell after curing.


4. Bonding:


A. Clean the metal and plastic surfaces completely, remove grease, and then apply sandpaper to the rubber surfaces except for the plastic surfaces, which are rinsed with acetone first, and then rubbed with acetone. When using acetone, please follow the cautions of using this solvent.


B. Apply the glass glue evenly to the surface of the ready object. If you are gluing two surfaces together, place one side in place first and then squeeze the other side with enough force to squeeze out air, but be careful not to squeeze out the glass glue.


C. The adhesive device was placed at room temperature and allowed to solidify.


5, sealing: silicone glass glue used for sealing occasions, also according to the above steps, the glass glue forced into the joint surface or gaps, so that the glass glue and the surface fully contact.


6. Cleaning: The glass adhesive can be wiped off with cloth or paper towel before curing, after curing, it must be scraped off with scraper or swabbed with solvent such as xylene and acetone.

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