Preparation and optimization of PP/PC light diffusing materials for ultraviolet shielding effect

doi:10.19491/j.issn.1001-9278.2023.08.002

Abstract

Abstract:

In this paper， PP/PC blends were prepared by using a laboratory⁃made internal mixer， and their microstructure， rheological properties， mechanical properties， and optical properties were characterized by topography analysis， rheological test， tensile test， notch impact strength test， and optical test. The UV shielding effect of UV⁃P filled PP/PC compounds was studied. The results indicated that there was a threshold of dispersed phase content in the coupling performance of light transmittance and haze. There was a threshold for the addition amount of UV⁃P according to the UV shielding effect. The tensile and impact strength of the as⁃prepared blends reached 30.40 MPa and 44.85 J/m， respective， at a PC content of 3 wt%. When 0.1 phr UV⁃P was incorporated， the blends presented an average transmittivity of 1.04 % in the UV region， a transmittance of 83.39 %， and a haze of 93.65 %. The blends developed in this work exhibited a good scattering effect and strong absorption of ultraviolet light.

Key words: light diffusing material, polypropylene, polycarbonate, ultraviolet shielding effect

CLC Number:

TQ317.6

WANG Wenhui, ZHU Huihao, LI Guo, WANG Yu, WU Fan, LIN Zhenbin, MA Yulu, XIE Linsheng. Preparation and optimization of PP/PC light diffusing materials for ultraviolet shielding effect[J]. China Plastics, 2023, 37(8): 8-12.

Figures/Tables 7

Fig.1. SEM images of PP/PC blends with different PC contents

PC相含量/%	$D ¯$ /μm	D₁₀/μm	D₅₀/μm	D₉₀/μm
1	0.469	0.19	0.45	0.76
3	4.301	2.21	3.57	5.79
5	5.018	2.51	4.93	7.83
10	6.208	2.54	4.98	9.77
20	12.726	3.75	11.03	21.10
30	15.835	3.21	11.57	30.54

PC相含量/%	$D ¯$ /μm	D₁₀/μm	D₅₀/μm	D₉₀/μm
1	0.469	0.19	0.45	0.76
3	4.301	2.21	3.57	5.79
5	5.018	2.51	4.93	7.83
10	6.208	2.54	4.98	9.77
20	12.726	3.75	11.03	21.10
30	15.835	3.21	11.57	30.54

Tab.1. Particle size distribution of PP/PC blends with different PC contents

Fig.2. Dynamic rheological properties of PP/PC blends with different PC contents

Fig.3. Tensile and notched impact strength of PP/PC blends with different PC contents

Fig.4. Optical properties of PP/PC blends with different PC contents

Fig.5. Ultraviolet spectra of the composites with different UV⁃P contents

Fig.6. Light transmittance and haze of the composites with different UV⁃P contents

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