Preparation of waterborne poly(urethane acrylic)heat-reflective coatings for asphalt pavement
Waterborne polyurethane(WPU)was prepared by using isophorone diisocyanate(IPDI),polypropylene gly-col(PPG)as raw materials,and it was further modified by using an acrylic monomer and a crosslinking agent to prepare the waterborne poly(urethane acrylic acid)(WPUA)lotion.The functional groups of the as-prepared WPUA were ana-lyzed by Fourier-transform infrared spectroscopy.The hardness and adhesion of the WPUA film was measured by using pencil hardness and hundred grid marking methods,respectively,and its hydrophobicity of WPUA film was tested by a water contact angle meter.The optimum formulation of the WPUA heat-reflective coating was determined through or-thogonal experimental design by taking cooling value,viscosity value,and gloss as evaluation indexes.The cooling ef-fect of the WPUA heat-reflective coating was investigated by using indoor solar radiation simulation devices and outdoor solar irradiation experiments.The results indicated that the WPUA film not only exhibited good hydrophobicity but also obtained an improvement in adhesion and hardness.The optimal preparation formulation of the WPUA heat reflective coating was determined to a WPUA lotion with 30 wt%solid content,16 wt%rutile titanium dioxide,2 wt%quartz sand,and 4%hollow glass beads.The WPUA heat-reflective coating presents a significant cooling effect both indoors and outdoors.
国家科技期刊平台
NSTL
万方数据
维普
