1625 Fluorocarbon Surfactant for Stone Protection: Application Mechanism and Formulation System Optimization
#Industry News
·2026-05-11 19:28:55
The bond energy of C-F bond is 485kJ/mol; fluorine atom features small atomic radius and extremely high electronegativity. The surface energy of fluorocarbon chain is ≤20mN/m, far lower than that of hydrocarbon and organosilicon, achieving superior hydrophobic and oleophobic dual repellency.
The water contact angle ranges from 120° to 135°, and the oil contact angle is over 90°, enabling the stone to resist stain adhesion and allow easy wiping clean.
It delivers excellent performance including acid and alkali resistance, UV resistance, salt corrosion resistance, freeze-thaw resistance, non-yellowing property and ultra-long weatherability.
Low surface tension penetration: It greatly reduces the interfacial tension of the system, rapidly penetrates into the 3~6mm capillary pores of the stone without blocking pores, and retains the air permeability of the stone.
Interfacial directional self-assembly: Fluorocarbon chains spontaneously migrate to the air-stone interface and arrange closely in a single molecule layer, forming an ultra-thin and dense protective film on both inner walls and surface.
Anchoring and bonding protection: The polar end forms hydrogen bonds or chemical bonds with hydroxyl groups of stone minerals; fluorocarbon chains face outward to form a low-energy barrier, blocking the invasion of water, oil stains, cement alkali, travertine and mold.
Long-term aging resistance by barrier effect: It cuts off the water-salt circulation, preventing stone efflorescence, weathering, frost heave, discoloration and pulverization peeling.
Organosilicon: Strong hydrophobicity, weak oleophobicity, prone to aging, ordinary stain resistance.
Fluorocarbon material: Excellent overall performance in hydrophobicity, oleophobicity, acid & alkali resistance, UV resistance and self-cleaning property, being the preferred material for high-end outdoor stone.
Mass fraction proportion:
Short-chain eco-friendly fluorocarbon surfactant (1625/1630): 1.0%~2.5%
Fluorosilicon modified acrylic resin: 8%~15% (for film formation & adhesion)
D30/D40 eco-friendly isoparaffin solvent: 80%~90%
Silane coupling agent: 0.3%~0.8% (for enhancing stone adhesion)
UV absorber + Antioxidant: 0.2%~0.5%
Leveling and wetting auxiliary agent: 0.1%~0.3%
Water-based fluorocarbon emulsion (solid content: 35%): 15%~25%
Non-ionic fluorocarbon surfactant: 0.5%~1.2%
Nano SiO₂ dispersion liquid: 2%~5% (for hardness improvement and wear resistance)
Non-ionic emulsifying dispersant: 0.4%~0.8%
pH regulator & Mildew inhibitor: Appropriate amount
Deionized water: Balance
Perfluorinated monomer: 52%~87%
Silane functional monomer: 1%~18%
Acrylic crosslinking monomer: 2%~50%
Initiator: 0.1%~2%
It integrates the ultra-low surface energy of fluorocarbon, strong penetration of silicone, high adhesion and superior weather resistance.
Fluorocarbon short-chain modification: Eliminate long-chain PFOA/PFOS, adopt C4~C6 short-chain fluorocarbon surfactants for faster penetration, environmental compliance and better compatibility.
Siloxane bridging modification: Introduce silane functional groups into fluorocarbon molecules to form covalent bonds with stone hydroxyl groups, extending the service life from 3~5 years to 10~15 years.
Coupling agent compounding: Combine silane coupling agent with titanate to significantly improve the interfacial bonding force of stone minerals.
Nano composite modification: Add 0.1%~0.3% nano SiO₂/TiO₂ to enhance film hardness, scratch resistance and UV shielding without affecting transparency.
Fluorocarbon & polyurethane compounding: Increase crosslinking density to improve wear resistance, scrub resistance and anti-trampling loss performance.
Solvent replacement: Replace xylene with D40 isoparaffin and bio-based ester solvents, featuring low odor, non-flammability and environmental compliance.
Water-based substitution for oil-based system: High-solid content water-based fluorocarbon system with VOC＜50g/L, avoiding hollowing and efflorescence of indoor wet-laid stone.
Strict control of surfactant dosage: 0.3%~2% for oil-based systems and 0.1%~0.5% for water-based systems; excessive dosage will cause shrinkage cavity, whitening and delamination.
Compound defoaming: Utilize the low-foam characteristic of fluorocarbon combined with a small amount of organosilicon defoamer to achieve pinhole-free and uniform leveling in brushing and spraying construction.
pH resistance adaptation: Use anionic surfactants for weakly alkaline marble; adopt non-ionic surfactants for general granite to avoid stone corrosion and discoloration.
Compound fluorocarbon surfactant with silicate barrier components to block the dissolution and precipitation of internal alkaline salts of stone, thoroughly solving common problems such as whitening, water spots and color difference of wet-laid stone.
Water contact angle: ≥120°
Oil contact angle: ≥95°
Acid and alkali resistance: No change after soaking in 5% acid and alkali solution for 48 hours
Artificial aging resistance: No yellowing and performance failure after ≥1000h aging test
Stone chromatic aberration ΔE＜1.0, colorless and transparent without covering natural texture
Penetration depth: 3~6mm, air permeable without pore blocking
The 1625 fluorocarbon stone protective agent realizes long-term protection through ultra-low surface energy dual repellency barrier and capillary penetration anchoring. The core formulation optimization consists of short-chain eco-friendly fluorocarbon surfactant, fluorosilicon hybrid film formation, nano reinforcement, silane anchoring and low VOC solvent, balancing five core indicators including penetration, stain resistance, weatherability, wear resistance and environmental performance.
