The hot melt adhesive used in low-temperature diapers is essentially a thermoplastic adhesive, but to adapt to low-temperature processes and improve safety, a specific formulation system is usually adopted.
Main Resin: Mostly ethylene-vinyl acetate copolymer (EVA) or polyolefin resins (such as polyethylene and polypropylene). These materials have low melting points (typically between 80℃ and 120℃), making them suitable for low-temperature hot melt processes.
Tackifying Resin: Commonly used are rosin resin derivatives or C5/C9 petroleum resins to enhance adhesion; some high-end products use hydrogenated petroleum resins to reduce odor.
Waxes or Softeners: Such as microcrystalline wax, paraffin wax, or low-molecular-weight polyethylene, used to adjust flowability, curing speed, and flexibility.
Antioxidants and Stabilizers: Prevent the hot melt adhesive from aging and degrading during high-temperature melting or long-term use.