| abstract |
The invention discloses a hot-melt adhesive powder for polyethylene/polyurethane foam and a preparation method and application thereof. The powder is calculated by weight percentage: polyethylene modified by polar monomers 30%-99.5%, polyethylene 0-65%, ethylene-vinyl acetate copolymer 0-30%, functional additives 0.5%-5%; adopt twin-screw extrusion process to extrude, blend and granulate, and obtain hot melt adhesive by mechanical grinding powder. The powder has good processability and excellent adhesion to polyethylene/polyurethane foam. It is used in spraying and winding thermal insulation pipes. Before the polyurethane foam is cured, the powder is sprayed or sprayed on the surface of the polyurethane foam, which can improve the performance. The interlayer bonding force of the polyethylene outer sheath/polyurethane foam layer makes the shear strength of the polyethylene outer sheath/polyurethane foam layer greater than 0.2MPa, which meets the requirements of the standard GB/T34611 for tangential shear strength. |