What is silicone sealant？What is silicone sealant use for?
Silicone sealant is a paste-like building sealing material composed of base rubber, filler, curing agent and other additives. It will solidify and become elastic rubber material after being used. Connected to the building base material, it plays the role of sealing, waterproof and leakproof, and is mainly used for caulking and sealing of building joints. As a kind of construction adhesive, it is significantly different from other construction adhesives such as glue in terms of form and application. Other construction adhesives are generally fluid and are mainly used for bonding and pasting construction decoration materials and have no sealing effect.
The Use of Silicone Sealant
Silicone sealants are frequently used in construction, such as
Window silicone sealant
Anti-mildew bathroom silicone sealant
Antifungal silicone sealant
General purpose silicone sealant
Transparent silicone sealant
Structural silicone sealant
Weather silicone sealant
Fireproof silicone sealant
The appropriate sealants can be selected according to the application scenes, if you have no idea which silicone sealant to use, welcome to consult us.
What is the curing mechanism of silicone sealant?
1. One-component silicone sealant: It cures by absorbing moisture in the air, and gradually solidifies from the outside to the inside. The curing rate is related to the ambient climate. The higher the temperature and humidity, the faster the curing.
2. Two-component silicone sealant: Part A is the base material, and Part B is the curing agent. They are mixed according to the specified ratio and then cured synchronously. The curing rate is related to the temperature. The higher the temperature, the faster the curing.
Our company's one-component products: door and window sealant, curtain wall sealant, container sealant, precast concrete panel joint sealant, solar panel silicone sealant, electronic sealant, silicone bathroom sealant, fireproof sealant.
Two-component products include insulating glass sealant, silicone structural and potting compound for electronics.
What are the classifications of silicone sealants?
Silicone sealant can be divided into 4 types according to curing type: neutral silicone, acetoxy silicone, deamidation type and deacetone type.
Silicone sealants are cured by condensation and desorption of volatile small molecules through chemical reactions, and silicone sealant can be classified according to the different desorption of small molecules.
1. Neutral silicone, this kind of product is neutral, according to the different small molecules released during the curing process, it is divided into alcohol (environmental protection and non-corrosive, also called non-corrosive silicone sealant) and deoxime (non-corrosive to most materials).
2. Acetoxy silicone: deacidifying type, releasing acetic acid when curing, this kind of product is acidic, has a sour taste, has certain corrosiveness to some metal materials, and also has certain irritation and corrosiveness to the human body, suitable for white glass and anodized aluminum and other materials.
3. Deamidation type: ammonia smell, ultra-low modulus, good elongation but poor adhesion, suitable for highways and airstrips
4. Acetone-free type: odorless, fast curing, long storage period, high temperature resistance (300°C), but the production process is complicated and the cost is high, mainly used in the electronics industry
Silicone sealants can also be divided into high modulus and low modulus:
-High modulus silicone sealant: high modulus means high strength, and high modulus of silicone sealant means that it has high hardness and strength. It usually has high and low temperature performance and good anti-aging performance.
Silicone adhesive with high modulus can be used under higher pressure and temperature when used, and also has good adhesion and wear resistance.
-Low modulus silicone sealant: Low modulus means low strength. Low modulus of silicone sealant means that its hardness and strength are relatively low. It is generally soft, viscous and compressible for applications requiring a highly flexible, form-fitting seal. Such as lighting roof, and places with relatively large displacement.
What are the advantages and disadvantages of silicone sealants?
What are the advantages of silicone sealant?
1. Good weather resistance: The main component of silicone sealant is polysiloxane. Since ultraviolet rays cannot destroy the silicon-oxygen bond, silicone sealant has good anti-ultraviolet performance, suitable for outdoor applications, and can effectively resist the influence of ultraviolet rays and ozone, will not easily change due to atmospheric changes. When used outdoors, it has good resistance to aging and prolongs the service life.
2. Strong adhesion, wide application range, bonding with different materials, resisting certain extrusion and vibration, and exerting good mechanical properties.
3. High-quality silicone sealant have good temperature resistance, can be used at low temperatures of minus 50 or 60 degrees, and can perform stably at temperatures of about 150 degrees.
4. Silicone sealant is very environmentally friendly
After choosing a good quality silicone sealant, there will be no pungent smell during construction, only a faint mellow smell. The smell does not affect health and does not induce disease. Operators do a good job of protection and do not have to worry about affecting their health.
What are the disadvantages of silicone sealant?
1. Can't be paintable
2. Cure is slower when used at low temperatures. The curing speed can be accelerated by heating without affecting the adhesion and curing speed.
FAQ:
1.When should you not use silicone sealant?
-Silicone sealants are not suitable for completely sealed environments, because the change of its physical state depends on the moisture in the air, but it is not suitable for construction in places soaked in water for a long time.
-when using silicone sealant, make sure that the cleanliness of the surface of the substrate, if the surface of the substrate is too dirty, the silicone sealant will not be very strong after curing,
-Because of the content of the silicone sealant, it is not suitable for bonding copper, brass, magnesium and other metals.
-If you need to paint over the substrate after sealing the gap, you should not use silicone.
2. Is silicone sealant permanent?
Not really, the general validity period of silicone sealant is 10-25 years, it depends on the environment and climate.
Such as we have antas 172 is a kind of neutral silicone for general purpose. We guarantee the validity over 10 years. antas 193 is a specific product for outside glass. validity over 25 years.
3. Why does silicone sealant crack?
There are many reasons for sealant cracking, such as poor quality sealant, improper construction, more reasons can be found in articles below, or contact us directly and our technique will provide solution for you. Send inquiry!
4. What about the colors of silicon sealant, can you customize color of sealants?
Yes, we have more than 100 colors can be chosen in our color chart and our factory offer customize color of silicone sealant, if you have any demand, just feel free to contact us.
5. What is the difference between silicone and sealant?
Sealant and silicone sealant are not comparable, the two are inclusive, please refer to the article for details.
