Study on properties of recycled polypropylene for automobile exterior parts

doi:10.19491/j.issn.1001-9278.2023.01.017

Abstract

Abstract:

In this study， a series of recycled polypropylene （RPP） materials were prepared by adding different amounts of post⁃consumer recycled polypropylene （PCR⁃PP） into virgin polypropylene （VPP）. The effect of the loading of PCR⁃PP on the tensile， bending， compression， and impact properties of RPP materials was investigated. The internal mechanism for the property degradation of RPP materials was studied by DSC， melting flow index， and scanning electron microscopy. The results indicated that the ageing resistance， crystallization performance， and machining properties of RPP materials decreased gradually with an increase in the PCR⁃PP content， resulting in a decrease in the strength properties and plasticity. When the content of PCR⁃PP was less than 30 %， the RPP materials presented strength and plasticity retention rates of above 90 %. The physical properties of RPP material can meet the requirements of automotive industry if reinforcing agents are used in the products. The research results obtained from this work provides an important data support for the practical application of RPP materials in the automotive industry.

Key words: automotive industry, polypropylene, recycled material, recycled content, mechanical property

CLC Number:

TQ325.1⁺4

ZHAO Yiquan, DONG Jinghan, ZHANG Tongzhu, WANG Yanmeng, DIAO Shuai, LI Minghe, XU Changzhu. Study on properties of recycled polypropylene for automobile exterior parts[J]. China Plastics, 2023, 37(1): 112-118.

Figures/Tables 9

样品	密度/g·cm^-3	灰分/%
RPP⁃HI 0	0.992	14.8
RPP⁃HI 10 %	0.995	14.9
RPP⁃HI 30 %	0.996	15.5
RPP⁃HI 50 %	0.998	15.9

Tab.1. Density and ash content of recycled polypropylene

Fig.1. Tensile， bending and compressive strength of the recycled polypropylene materials

Fig.2. Tensile and bending modulus of the recycled polypropylene

Fig.3. Elongation at break and yield elongation of recycled polypropylene

Fig.4. Impact strength of recycled polypropylene at 23 ℃

Fig.5. Impact strength of recycled polypropylene materials at -30 ℃

Fig.6. DSC heating curves of recycled polypropylene

Fig.7. Oxidation induction time of the recycled polypropylene

Fig.8. Tensile fracture morphology of the recycled polypropylene

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