In protection for building facades, rail-transit skins, semiconductor insulation, and high-barrier plastic packaging, the "trilemma" is: "organic coatings can't break 9H, anti-corrosion fails before 1000h salt spray, barrier layers can't be thin yet non-brittle." Fluorocarbon/epoxy is hard but brittle; silicone resin heat-resists but hydrophilicity poor; CVD inorganic films are thin yet damage substrates. As smart city signage, EV battery laminates, and automotive IGBTs impose stricter demands for "inorganic ultra-hard, hydrophilic easy-clean, 800℃-rated, O₂/H₂O barrier," sourcing a perhydro polysilazane (PHPS), 20% solids in n-butyl ether, multi-mode curable at RT/moist/heat has become a key proposition for localizing high-end protective coatings.

Addressing this "inorganic ultra-hard hydrophilic film" pain point, IOTA (Anhui IOTA Silicone Oil Co., Ltd.) officially launches Perhydro Polysilazane IOTA PHPS (synonym: Nano Hydrophilic Super Hard Stain-Resistant Coating Material). With specs "colorless transparent liquid, solids 20% (tunable 2-20%), density 0.82-0.84 (20% soln)/1.16-1.31 (pure), cured density 1.6-2.0, hardness 3GPa (ammonia)/8-10GPa (HT), pencil 9H, visible >90%, cross-cut 0-grade, 800℃ heat," and backed by "Si-N perhydro backbone hydrolyzes to SiOx, multi-mode cure, inorganic ultra-hard hydrophilic," it emerges as the "Inorganic Armor Seed" for anti-graffiti, precious-metal anti-corrosion, rail vehicles, semiconductor insulation, and high-barrier packaging.

Molecular Precision: Perhydro Si-N Backbone Hydrolyzes to Ceramic

The core competitiveness of IOTA PHPS stems from its "≡SiH–NH– repeating units" perhydro polysilazane backbone that opens the inorganic door upon contact with water:

• Si-N Hydrolysis → SiOx Inorganic Film: Cure mechanism is Si-N hydrolysis: ≡Si–NH–Si≡ + H₂O → ≡Si–O–Si≡ + NH₃↑ Ammonia-catalyzed RT 7 days or moist 150℃×2h forms film; high-temp curing (>300℃) dehydrogenates then oxidizes, creating a dense SiOx network (>100nm)—hardness jumps to 8-10GPa, pencil 9H.
• Dual Cure Modes:
  • RT / Ammonia Cure: Coat, place in humid (RH>60%) or spray dilute ammonia; 7 days reaches 3GPa, 9H (ChungHwa)—fit for heat-sensitive plastics/aluminum laminates;
  • Moist 150℃×2h / HT ≥300℃: For metal, glass, rail vehicle parts; hardness 8-10GPa, modulus 100-130GPa, near-ceramic.
• 20% Solids Process-Friendly: n-Butyl ether solvent (xylene/dibutyl ether/CH₂Cl₂ alternative), 20% soln density 0.82-0.84, low viscosity—spin/ wipe/spray/dip, film >100nm controllable.
• Hydrophilic Easy-Clean + Ultra-Hard Stain-Resist: Surface Si–OH/Si–O⁻ yields hydrophilicity (<60°); graffiti / oil poorly adheres, rinses off with high-pressure water; meanwhile 9H pencil resists scratching—spray paint wipes away.

Performance Leap: From Anti-Graffiti to 800℃ Inorganic Armor

Used alone or in combination:

• Architectural Anti-Graffiti: Facade/signage coated—spray paint, marker, gum adhere extremely weakly; high-pressure water + brush restores, outperforming fluorocarbon self-clean.
• Precious Metal / Rail Anti-Corrosion: SiOx layer seals pinholes on Al/Cu/Mg; 1000h salt spray no red rust; rail skins resist acid rain and detergents.
• Semiconductor Insulation / Barrier: Inorganic dielectric/passivation layer, low leakage, 800℃ reflow-proof; Al-laminate, pharma blister, flexible OLED barrier (ultra-low WVTR).
• Electronic Circuit Protection: PCBA, IGBT copper bar coating—solder-heat resistant, salt-spray resistant, self-extinguishing.

Application Penetration: From Smart Signage to Battery Laminate

IOTA PHPS locks onto quadruple-sensitive scenarios: "ultra-hard + hydrophilic self-clean + high barrier + heat":

• Architecture & Municipal: Anti-graffiti walls, smart poles, road signs, subway wall panels.
• Rail Transit: HSR/metro Al car bodies, pantograph insulators, platform screen doors.
• Semiconductor & Electronics: Wafer temporary bonding, power module passivation, FPC barrier overlay.
• Packaging & Energy: Al laminate (Li-ion cell), pharma high-barrier film, flexible PV backsheet water barrier.

IOTA Process Guide: Block Water, Use Ammonia, Control Cure

• Substrate Prep: Degrease/deoxidize; Al/Mg alloy may first receive chrome-free passivation or MAO to anchor SiOx.
• Formulation & Apply: Use as-is (20% n-butyl ether) or dilute to 2-20% with xylene/dibutyl ether; spin/spray/dip/wipe, control wet film for dry >100nm.
• Cure 3-Choose: ①RT RH>60% or 2% ammonia spray, 7 days (plastic/laminate); ②moist 150℃×2h (general metal); ③HT 300-400℃×0.5-1h (rail/semiconductor, gives 8-10GPa).
• Don'ts & Storage: 0.5-10L metal drum, below 10℃ nitrogen-sealed (domestic 1yr, export 6mo); use quickly after opening; keep from water/alcohol/acid-base; dispose waste per hazardous regulations; cured coating solvent-unremovable.

Industry Expert Insight: Experts note that under the triple wave of "dual-carbon + smart city + automotive power semiconductors," inorganic polysilazanes are shifting from "lab CVD precursor" to "brush-on-ceramic" industrialization. IOTA PHPS—with "perhydro Si-N + 20% n-butyl ether + 9H/800℃"—aligns with international routes (AZ Electronic Materials / Wuxi Juhe PHPS), solving the layered pain of anti-graffiti/corrosion/barrier, while giving domestic rail, semiconductor, and new-energy packaging a one-stop "paint-on, fire-to-ceramic" base. This milestone signifies that domestic inorganic polysilazanes now possess hard power—from following to parallel running—on the "ultra-hard hydrophilic inorganic film" track.