May 01, 2025
Silanes work by chemically forming a siloxane (Si-O-Si) network anchored to the pore walls of concrete without clogging them. When applied, small silane molecules (e.g., isobutyl triethoxysilane) penetrate the concrete surface, react with moisture, and form a hydrophobic layer. This layer repels water and harmful ions (like chlorides) while allowing vapor to escape—a critical feature for preventing freeze-thaw damage and corrosion.
Isobutyl Triethoxysilane
Structure: Branched C4 alkyl chain.
Advantages: Deep penetration (3–5 mm), excellent for cold climates (works down to -50°C).
Use Case: Ideal for bridges in freezing regions.
n-Butyl Triethoxysilane
Structure: Straight-chain C4 alkyl.
Advantages: Balanced cost and performance, moderate hydrophobicity (contact angle: 115–120°).
Use Case: General-purpose protection for urban buildings.
Isooctyl Triethoxysilane
Structure: Branched C8 alkyl chain.
Advantages: Superior UV resistance and chloride barrier (95% reduction), with 25+ years of service life.
Use Case: Coastal infrastructure (e.g., seawalls, harbors).
n-Octyl Triethoxysilane
Structure: Straight-chain C8 alkyl.
Advantages: Highest hydrophobicity (contact angle: 130–135°) and heat resistance (>300°C).
Use Case: High-temperature environments (e.g., industrial chimneys).
| Property | Isobutyl | n-Butyl | Isooctyl | n-Octyl |
|---|---|---|---|---|
| Penetration Depth | 3–5 mm | 2–4 mm | 4–6 mm | 3–5 mm |
| Water Repellency | Good | Moderate | Excellent | Best |
| UV Resistance | 15–20 years | 15–20 years | 25–30 years | 25–30 years |
| Used For | Cold climates | Urban buildings | Marine zones | High-heat areas |
Step 1: Assess the environment (e.g., coastal, industrial, or cold regions).
Step 2: Prioritize key properties:
Need deep penetration? → Isobutyl triethoxysilane.
Fighting salt corrosion? → Isooctyl triethoxysilane.
Extreme heat? → n-Octyl triethoxysilane.
Step 3: Verify compliance with standards like ASTM C1585 (water absorption) or EN 1062-3 (alkali resistance).
Sino-Sina possesses extensive production and R&D capabilities, enabling the supply of all four silanes (isobutyl triethoxysilane, n-butyl triethoxysilane, isooctyl triethoxysilane, and n-octyl triethoxysilane) to enhance concrete durability. Its solutions have been successfully applied in numerous critical infrastructure projects across China, including bridges, nuclear power plants, and port concrete structures.
The above data does not constitute a warranty or guarantee of product performance.
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