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<p>Addressing the technological challenges in the automotive industry concerning energy consumption, environmental protection, aging susceptibility, and safety, this study focuses on the lightweighting and UV-resistant modification of polypropylene (PP)-the most widely used and highest-volume polymeric material in automotive plastics. Such design holds critical significance for the green transformation of the automotive industry. The research employs hollow glass beads (HGB) and titanium dioxide (TiO<sub>2</sub>) as functional fillers, and successfully develops a novel PP-based composite material through surface grafting modification of HGB using tetrabutyl titanate (TBT). The results indicate that the coupling agent TBT uniformly coated the surface of HGB via chemical bonding, significantly enhancing the interfacial interaction between the filler and the PP matrix, thereby laying the foundation for improved mechanical properties of the material. The self-lubricating effect of TiO<sub>2</sub> effectively reduces intermolecular friction within the system, elevating the MFR of the composite material to 15.43&#xa0;g/10min, thus significantly improving its processability. After undergoing 100&#xa0;h of artificial accelerated hygrothermal aging tests, pure PP specimens exhibit obvious cracking and performance degradation, whereas the PP/TBT-HGB/TiO<sub>2</sub> (0.50 wt%) composite material shows no visible surface cracks and maintains excellent mechanical property retention, with a flexural strength of 59.54&#xa0;MPa, flexural modulus of 1842&#xa0;MPa, tensile strength of 35.24&#xa0;MPa, impact strength of 23.58 kJ/m<sup>2</sup>, and a reduced density of 0.886&#xa0;g/cm<sup>3</sup>. Compared to traditional PP materials, this composite material not only meets the lightweighting demands of the automotive industry but also enhances weather resistance through the synergistic UV-resistant effect of TiO<sub>2</sub>. Its balance of low density and excellent mechanical properties demonstrates significant engineering application advantages in terms of achieving carbon neutrality goals and optimizing overall performance.</p>

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Preparation and properties of lightweight UV-resistant polypropylene composites using TBT modified HGB in conjunction with TiO2

  • 期刊论文

  • 发表日期：

    2025年12月4日

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  • Guxia Wang,
  • Haohao Li,
  • Yipeng Li,
  • Liyang Ding,
  • Yakun Lan,
  • Dan Li,
  • Shengwei Guo

摘要

Addressing the technological challenges in the automotive industry concerning energy consumption, environmental protection, aging susceptibility, and safety, this study focuses on the lightweighting and UV-resistant modification of polypropylene (PP)-the most widely used and highest-volume polymeric material in automotive plastics. Such design holds critical significance for the green transformation of the automotive industry. The research employs hollow glass beads (HGB) and titanium dioxide (TiO2) as functional fillers, and successfully develops a novel PP-based composite material through surface grafting modification of HGB using tetrabutyl titanate (TBT). The results indicate that the coupling agent TBT uniformly coated the surface of HGB via chemical bonding, significantly enhancing the interfacial interaction between the filler and the PP matrix, thereby laying the foundation for improved mechanical properties of the material. The self-lubricating effect of TiO2 effectively reduces intermolecular friction within the system, elevating the MFR of the composite material to 15.43 g/10min, thus significantly improving its processability. After undergoing 100 h of artificial accelerated hygrothermal aging tests, pure PP specimens exhibit obvious cracking and performance degradation, whereas the PP/TBT-HGB/TiO2 (0.50 wt%) composite material shows no visible surface cracks and maintains excellent mechanical property retention, with a flexural strength of 59.54 MPa, flexural modulus of 1842 MPa, tensile strength of 35.24 MPa, impact strength of 23.58 kJ/m2, and a reduced density of 0.886 g/cm3. Compared to traditional PP materials, this composite material not only meets the lightweighting demands of the automotive industry but also enhances weather resistance through the synergistic UV-resistant effect of TiO2. Its balance of low density and excellent mechanical properties demonstrates significant engineering application advantages in terms of achieving carbon neutrality goals and optimizing overall performance.