Preparation of Composite Semiconductor Micro-sheets with UV Shielding Performance and Its Application in Polypropylene

doi:10.7503/cjcu20220071

Abstract

Abstract:

In order to improve the aging resistance of polypropylene（PP）， Mica/MnO₂/TiO₂ composite semiconductor microsheet was synthesized by chemical liquid deposition method. Then， the microsheets were introduced into PP by physical blending method. The morphology， crystal structure and UV absorption properties were characterized by scanning electron microscopy（SEM）， X-ray diffraction（XRD）， Raman spectroscopy（RS）， UV-Vis diffuse reflection spectroscopy（UV-Vis DRS） and electronic universal testing. The influence of TiO₂contents， concentrations of MnO₂ and pH values on the morphology structure， UV shielding performance of microsheet and the anti-aging modification effect of the microsheet on PP were investigated. The results showed that the crystal type of TiO₂ in the microsheet could be transformed from anatase to rutile when the addition level of MnO₂ was 2.0%， the supporting amount of TiO₂ was 20%， and the pH value was 1.6. The microsheet had good coating condition and excellent UV shield performance. Compared with pure PP， after UV aging for 27 d， the amount of C=O produced by PP modified by composite semiconductor microsheet decreased， the surface morphology retention was higher. The UV aging resistance was significantly improved with a 38% increasing tensile strength retention rate.

Key words: Mica/MnO₂/TiO₂, Liquid phase deposition, UV shielding, Polypropylene

CLC Number:

O631

TrendMD:

JIANG Shenghan, CAO Changlin, XIAO Liren, YANG Tang, QIAN Qingrong, CHEN Qinghua. Preparation of Composite Semiconductor Micro-sheets with UV Shielding Performance and Its Application in Polypropylene[J]. Chem. J. Chinese Universities, 2022, 43(8): 20220071.

Figures/Tables 12

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