hazardous chemical sealing

Breakthrough in material modification achieved by introducing perfluoroalkyl side chains (C6F13-):   98% concentrated sulfuric acid immersion for 30 days, mass change rate <0.3% Compression modulus attenuation rate <10% at 180℃   A 10,000m³ concentrated sulfuric acid storage tank foundation in Shandong Dongying Refining and Chemical Project had acid leakage, and a "three-stage protection system" was adopted:   Base treatment: phosphoric acid solution etches the concrete surface to increase mechanical bite force Transition layer: epoxy primer containing glass flakes (thickness 200μm) Main layer: fluorine-modified polyurethane grouting liquid (fluorine content 18%) Key construction parameters:   Grouting temperature controlled at 40-50℃ (optimal range of NCO reaction activity) Segmented pressure grouting, each section maintains a pressure of 1.2MPa for 10 minutes Acceptance test shows: acid penetration is reduced from 15L per day to 0.02L, meeting GB 50046-2018 Severe corrosion protection requirements.   Technical matrix for selection Recommended formula for corrosive media Characteristics Expected life Concentrated sulfuric acid Fluoride content ≥ 15% 10 years Crude oil NCO content 22% 8 years Alkaline solution Polyether structure 12 years