Abstract:

A paint residue modified high⁃density polyethylene waterproof board was prepared using high⁃density polyethylene （PE⁃HD） as a matrix resin， solid waste paint residue as a filling modifier， and silane coupling agent （KH⁃560） as an interface modifier. The effects of paint residue content and silane coupling agent dosage on the impermeability， mechanical properties， and thermal aging resistance of the composite material were studied. The experimental results indicated that the elongation at break of the modified PE⁃HD waterproof board decreased significantly with increasing paint residue content， and its tensile strength and contact angle exhibited an initial gradual increase at paint residue levels ≤ 4 wt%， followed by a sharp decline at higher concentrations. The thermal aging resistance of the modified PE⁃HD waterproof board remained largely unaffected by paint residue content. The addition of KH⁃560 improved fracture elongation， demonstrating its effectiveness in enhancing interfacial bonding between the PE⁃HD matrix and paint residue filler. This work highlights the potential of repurposing industrial paint residue into functional additives for polymer composites， offering a sustainable solution for high⁃performance waterproofing materials.

Key words: solid waste paint residue, waterproof board, high density polyethylene