China Plastics ›› 2024, Vol. 38 ›› Issue (1): 21-27.DOI: 10.19491/j.issn.1001-9278.2024.01.004

• Materials and Properties • Previous Articles     Next Articles

Preparation of waterborne poly(urethane acrylic) heat⁃reflective coatings for asphalt pavement

LI Ningli1(), WANG Rui1, CHANG Zipan1, LI Peilong2()   

  1. 1.School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin 300401,China
    2.Key Laboratory of Highway Structure and Materials,Chang’an University,Xi’an 710064,China
  • Received:2023-07-23 Online:2024-01-26 Published:2024-01-22

Abstract:

Waterborne polyurethane (WPU) was prepared by using isophorone diisocyanate (IPDI), polypropylene glycol (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 analyzed 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 orthogonal experimental design by taking cooling value, viscosity value, and gloss as evaluation indexes. The cooling effect 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.

Key words: road works, waterborne poly(urethane acrylic acid) heat reflective coating, infrared spectrum, orthogonal experiment, cooling effect

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