Chinese Journal of Applied Chemistry ›› 2017, Vol. 34 ›› Issue (4): 430-435.DOI: 10.11944/j.issn.1000-0518.2017.04.160260

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Influence of 3-Aminopropyltriethoxysilane on Natural Aging Property of Polyurethane/Al-Sm2O3 Composite Coatings

ZHANG Weiganga*(),XU Guoyueb,XUE Lianhaia,CHEN Yaxia   

  1. aCollege of Materials and Chemical Engineering,Chuzhou University,Chuzhou,Anhui 239000,China
    bCollege of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China
  • Received:2016-06-21 Accepted:2016-09-05 Published:2017-03-31 Online:2017-03-31
  • Contact: ZHANG Weigang
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.40772033), University Natural Science Research Key Project of Anhui Province(No.KJ2016A535), Research Projects of Chuzhou University(No.2015PY02), Scientific Research Start Foundation Project of Chuzhou University(No.2015qd15)

Abstract:

Polyurethane(PU)/Al-Sm2O3 composite coatings were modified by silane coupling agent 3-aminopropyltriethoxysilane(KH550). The variation of natural aging property before and after modification was systematically investigated from the perspectives of functional properties and mechanical properties. The results indicate that the stability of infrared emissivity of PU/Al-Sm2O3 composite coatings for natural aging is significantly enhanced after KH550 modification. The infrared emission of modified coatings is significantly lower than that of unmodified coatings under the same conditions. The dispersion of Sm2O3 particles on the coatings' surface is more uniform after modified by KH550. The near-infrared light absorption intensity has increased, and this leads to a 1.06 μm near-infrared reflectivity of modified coatings, which is significantly lower than that of unmodified coatings. The coatings' hardness has good stability for natural aging before and after modification. The hardness can maintain for 3 H. The adhesion strength and impact strength of the unmodified coatings are significantly affected by natural aging, but it can be significantly strengthened after KH550 modification to maintained at 1 grade and 50 kg·cm after natural aging for 4 months, respectively.

Key words: composite coatings, infrared emissivity, near-infrared reflectivity, natural aging property, mechanical properties