One-component silicone sealant is the main agent and curing agent together. It is cured by contact with moisture in the air. It is highly dependent on air humidity. During curing, it gradually cures from the surface to the inside, and the curing depth is limited to 6mm. Too thick glue layer is difficult to solidify in the deep part; two-component glue is divided into two parts AB, which need to be proportioned when used. When curing, the inside and outside are solidified at the same time, which can be used for thicker glue.

1. Under what circumstances should one-component silicone sealant be used, and vice versa?

Silicone sealant is generally single-component, and it is convenient to operate a single piece. Our exterior wall aluminum panels and insulating glass use this kind. There are many structural adhesives that use two components, such as the hollow glass sub-frame, the glue and the curing agent are injected in proportion, the curing is fast, and the speed can be adjusted.

2. When the two-component silicone sealant group A and group B are mixed, what is it that reacts and cures?

The principle is the same as the one-component reaction of silicone glue with water, one is water in the air and the other is water in the curing agent. Using organosilanes with hydrolyzable groups as crosslinking agents, under the action of catalysts such as tin compounds or titanium compounds, it condenses with the hydroxyl end of the base rubber dihydroxy polydimethylsiloxane to form acetoxime groups, which are combined with The trace moisture in the curing agent is hydrolyzed into silanol, and the silanol and acetoxime group are then condensed to finally form a network structure.

3. Which two-component silicone sealant or one-component silicone sealant dries quickly?

Because the single-component is a stable ratio, it is generally cured on the surface for 20 minutes at room temperature, and the total curing time is specified to be 12 hours before being used on the wall.

If the two-component ratio is correct, the curing time is about the same as the one-component curing time; if the ratio is incorrect, it means that there is too much curing agent and the curing time will be very fast.

4. What is the difference between single and two-component silicone glue?

Most of the single-component packaging is supported, the capacity is limited, and it is more convenient to use on the construction site; the two-component packaging is in barrels, and most of the glass processing plants are fully automatic equipment for continuous production, and The curing needs to be fast and efficient, and there are also two-component structural adhesives that are directly used on the construction site, but the operation is not very convenient. The main reason is that the one-component curing is slow and easy to operate, and the two-component curing is more troublesome when used on the construction site.

6. What does one-component silicone structural sealant mean?

A silicone structural adhesive used to bond glass and aluminum attached frames when making glass curtain walls. Single component: refers to the packaging method of this kind of glue, which is to pack the product in a packaging bottle (or packaging bag), and directly squeeze it out and apply it on the bonding surface of the glass and aluminum frame. The corresponding is two-component, two-component is the product is packaged in two packages, before use can be used after mixing.

Silicone: It means that the main chemical component of this sealant is silicone instead of other chemical components such as polyurethane or polysulfide.

Structural sealant: refers to the purpose of this sealant, that is, it is used to bond glass and aluminum frame when making glass curtain wall. Corresponding to the weather-resistant sealant, the weather-resistant sealant is not used for bonding, but for caulking and sealing.