Low-energy Preparation Method and Characterization of Insulated Sandwich Panel from Rigid PU Foam Wastes

摘要

This article introduces a low-energy preparation method of the insulated sandwich panel from rigid Polyurethane foam wastes through three technological processes of foam cutting, mixture of particles and adhesive, and curing and moulding. It is featured by curing at normal temperature, low energy consumption and simple technologies due to the application of adhesive with the main composition of unsaturated resin that cures at normal temperature. The mechanical property, moisture permeability and thermal insulation of finished products depend on the size and dosage of foam particles and adhesive consumption. Results of tensile test, moisture-permeability test and coefficient of thermal conductivity test on different samples show that the effect of foam particle size can be neglected because it has less influence on the tensile strength, moisture permeability and thermal insulation of insulated sandwich panel;;that the tensile strength increases with more foam particles and adhesive used;;that the dosage of adhesive is also negligible when its effect on moisture permeability and thermal insulation is evaluated, while the moisture permeability and thermal insulation increase with more foam particles used.