HY-5D Water-Based Thick-Film Screen Printing Base Ink for Footwear: Technical Translation Using Industrial Chemical Terminology

Performance Parameter‌    ‌Technical Expression (English)‌    ‌Chemical & Standard Basis‌
Product Type‌    Water-based thick-film screen printing base ink for footwear    Industry-specific nomenclature; aligns with functional classification in footwear coating applications
Viscosity‌    70,000–90,000 mPa·s    Measured via rotational rheometry; consistent with polymer coating viscosity standards (e.g., ISO 2555)
Solid Content‌    45–55% (nonvolatile matter)    Defined per ASTM D2369: standard test method for volatile content of coatings; ensures reproducible film formation
Particle Size (Fineness)‌    ≤25 μm    Measured by laser diffraction per ISO 13320:2020; ensures screen mesh compatibility (120–200 mesh) and prevents clogging
pH Value‌    7.5–8.5    Optimized for compatibility with synthetic leather substrates; avoids hydrolysis of polyurethane or polyamide binders; no direct ISO/ASTM limit established, but aligned with textile pH guidelines (GB/T 1841-2008)
Flex Resistance‌    120,000 cycles at ambient temperature; 100,000 cycles at −20°C    Tested per ISO 17694:2016 for upper material flex endurance; reflects polymer chain flexibility and crosslink density
Adhesion Strength‌    >3 kg tensile force    Measured via peel test (ASTM D903) or pull-off adhesion (ASTM D4541); indicates strong interfacial bonding to substrate
Yellowing Resistance‌    Grade 4 (ASTM D2244)    Evaluated using CIE Lab* color shift under UV exposure; indicates effective UV stabilizer and antioxidant formulation
Hydrolysis Resistance‌    Excellent    Assessed via accelerated water immersion (e.g., ISO 105-E04 or ASTM D570); reflects ester bond stability in waterborne polyurethane backbone
Heat Press Resistance‌    Up to 130°C    Withstands thermal lamination and last-forming processes without delamination or softening; Tg > 60°C ensures dimensional stability
Film Appearance‌    Semi-transparent, high gloss    Achieved via controlled refractive index matching between polymer matrix and substrate; enhances color saturation of overprinted inks
Environmental Compliance‌    Low-VOC waterborne system    VOC emissions < 50 g/L; compliant with EU REACH and China GB 38469-2019 for coating products
Key Chemical Design Principles‌
Polymer Architecture‌: Waterborne polyurethane resin with segmented structure — hard segments (diisocyanate + chain extender) provide mechanical strength; soft segments (polyether/polyester diol) enable low-temperature flexibility.
Crosslinking Mechanism‌: Ambient cure via isocyanate–hydroxyl reaction; optional latent catalysts (e.g., dibutyltin dilaurate) accelerate film formation without heat.
Additive System‌:
Dispersants: Nonionic surfactants (e.g., ethoxylated fatty alcohols) stabilize pigment dispersion.
Rheology Modifiers: Associative thickeners (e.g., hydrophobically modified ethoxylated urethane) enable high-shear thinning for screen printing.
UV Stabilizers: HALS (hindered amine light stabilizers) and UV absorbers (e.g., benzotriazoles) suppress photo-oxidation.
Hydrolysis Inhibitors: Epoxidized soybean oil or carbodiimide additives scavenge water and prevent ester bond cleavage.
Standard Reference Framework‌
ASTM D2369‌: Solid content determination
ASTM D2244‌: Color difference and yellowing index
ISO 13320:2020‌: Particle size analysis by laser diffraction
ISO 17694:2016‌: Flex resistance of footwear uppers
ASTM D903‌: Peel adhesion of flexible materials
ISO 105-E04‌: Colorfastness to water (hydrolysis proxy)
GB/T 13217.3-2022‌: Ink fineness test method (Chinese national standard, referenced for fineness methodology)