Building silicone sealant plays a very important role in construction projects. It can effectively seal various materials and also has excellent weather resistance and durability. However, when choosing building silicone sealant, many factors need to be considered to ensure that the best product that meets the needs of the project.
1. Common silicone sealants and features:
(1) Silicone structural sealant
Use: For sealing and bonding of glass curtain walls, building doors and windows and other structures, joint sealing and waterproofing of building structures.
Features:
- It has good weather resistance and aging resistance, and can maintain its elasticity and sealing for a long time
- It has good chemical resistance and can resist corrosion from chemicals such as acids and alkalis
- It has good bonding properties and can firmly bond to different building material surfaces
(2) Silicone weather-resistant sealant
Use: For sealing the joints of doors and windows, curtain walls, glass curtain walls, concrete components and other building structures seam sealing.
Features:
- Weather resistance: It can resist the erosion of ultraviolet rays, high temperature and harsh environment, and maintain the long-term stability of sealing performance.
- Flexibility: It has good elasticity and aging resistance, and can adapt to changes under different construction conditions
(3) Anti-mildew silicone sealant
Use: For sealing various building surfaces, windows, glass, bathrooms, kitchens, etc., to prevent mold and water vapor from entering the sealed gaps, and play a role in anti-mildew, waterproof and moisture-proof.
Features:
- High-efficiency anti-mildew and waterproof: Anti-mildew silicone sealant has excellent waterproof and mildew resistance, which can effectively prevent water vapor and mildew from penetrating, and keep the sealant for long-term use.
- Silicone sealant has excellent weather resistance and elasticity, long service life, and is not easy to age and deteriorate.
(4) Fireproof silicone sealant
Use: For sealing fireproof doors and windows, fireproof isolation of buildings, sealing of cable ducts and other occasions requiring fireproof sealing
Features:
- Good fireproof performance: It has good fireproof performance and can effectively delay the spread of fire.
- High temperature resistance: It can maintain stable performance under high temperature environment and will not deform or crack.
- Good sealing performance: Fireproof silicone sealant has excellent sealing performance and can effectively prevent the penetration of external substances such as smoke.
2. Common problems of silicone sealant
(1) What is the reason for the yellowing of neutral transparent sealant?
The yellowing of transparent neutral sealant is due to defects in the sealant itself, mainly due to the amine groups contained in the cross-linking agent and the thickener. This amine group is the cause of yellowing. In addition, when transparent neutral sealant is used together with acid glass sealant, it may cause yellowing after curing. In addition, long-term storage or reaction with the substrate may also cause yellowing.
(2) Why does the back of the mirror have sealant marks on the mirror surface after glass sealant is applied?
The back of the mirror usually has mercury, pure silver and copper plating. Using acid glass sealant will cause mirror surface spots. Neutral sealant, such as alcohol type or ketoxime type, is more suitable. Selecting incompatible sealant will cause mirror corrosion. It is recommended to do a compatibility test before use.