Review a process-based approach to polyurethane flame-retardant selection, from the required fire test to chemistry, dispersion and production trials.
Jiacheng Dai 
Explore how polyurethane fillers change viscosity, settling, abrasion and mixing, and what those changes mean for pumps, recirculation and dosing equipment.
Jiacheng Dai 
Review applications for polyester-based polyurethane, its service-condition trade-offs and the material-conditioning and processing requirements behind selection.
Jiacheng Dai 
Compare polyether and polyester polyols through service conditions, hydrolysis behavior, mechanical properties and metering-line processing requirements.
Jiacheng Dai 
Compare amine and diol chain extenders for polyurethane, including material-selection trade-offs and the temperature, ratio and equipment changes needed when switching.
Jiacheng Dai 
Understand polyurethane exotherm peaks and review how formulation, part geometry, temperature and heat removal affect cure and finished-part quality.
Jiacheng Dai 
Review polyol and isocyanate equivalent-weight calculations, connect them to isocyanate index, and identify common errors in polyurethane formulation math.
Jiacheng Dai 
Explore polyurethane elastomer chemistry, material types, hardness and mechanical properties, with production considerations for selecting a processing route.
Jiacheng Dai 
Explore dual-density polyurethane sole production, from the two-layer design and pouring sequence to the metering and reaction controls needed for consistent molding.
Jiacheng Dai 
Compare dynamic and high-pressure impingement mixing for polyurethane, including shot size, viscosity, cleaning, maintenance and process-selection trade-offs.
Jiacheng Dai 
