Phase Change Material (PCM) Coating
topic
Phase change material coatings microencapsulate n-paraffins (C16–C22, melting point 18–32°C) in polymer shells (melamine-formaldehyde or polyurea, 2–8 µm diameter) at 50–80% core content, dispersed in acrylic binder at 30–60 g/m² dry add-on via padding or knife coating. Latent heat storage of 80–180 kJ/kg moderates skin-fabric microclimate temperature fluctuations by 3–5°C, delaying thermal discomfort onset by 15–30 minutes (ISO 11092 dynamic test). Microcapsule rupture resistance exceeds 10,000 flex cycles (IWS TM 112). Wash durability of 25–50 cycles at 40°C is achievable with cationic binder systems. Applications include activewear, protective workwear, and smart bedding. Outlast technology (NASA-derived) dominates the commercial PCM textile market.
Role
Provides passive thermoregulation in performance apparel and bedding, buffering body temperature fluctuations during activity transitions and sleep cycles without electronic components or external power, improving wearer comfort and sleep quality.