Flame retardant and mechanical properties of wood-plastic composites with multi-layer sandwich structures

GUO Yujia; XU Jingwen; CHEN Wenli; FAN Qi; SUN Lichao; WANG Qingwen

Volume 41 Issue 7

Jul. 2024

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GUO Yujia, XU Jingwen, CHEN Wenli, et al. Flame retardant and mechanical properties of wood-plastic composites with multi-layer sandwich structures[J]. Acta Materiae Compositae Sinica, 2024, 41(7): 3738-3747.

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GUO Yujia, XU Jingwen, CHEN Wenli, et al. Flame retardant and mechanical properties of wood-plastic composites with multi-layer sandwich structures[J]. Acta Materiae Compositae Sinica, 2024, 41(7): 3738-3747.

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Flame retardant and mechanical properties of wood-plastic composites with multi-layer sandwich structures

GUO Yujia¹,
XU Jingwen¹,
CHEN Wenli¹,
FAN Qi^{1
,
,},
SUN Lichao^{1, 2
,
,},
WANG Qingwen^{1, 2}

1.
Key Laboratory for Biobased Materials and Energy of Ministry of Education (South China Agricultural University), Guangzhou 510642, Guangdong, China
2.
Guangdong Laboratory of Lingnan Modern Agriculture,Guangzhou 510642, Guangdong, China

Funds: Guangdong Basic and Applied Basic Research Foundation (No. 2021A1515011014); Research and Development Program in Key Areas of Guangdong Province (No. 2020B0202010008)

Received Date: 2023-09-04
Accepted Date: 2023-10-21
Rev Recd Date: 2023-10-08

Available Online: 2023-11-11

Publish Date: 2024-07-15

Abstract

Abstract

In order to solve the problems of high flame-retardant addition and deterioration of mechanical properties in the modification of wood-plastic composites (WPCs) by traditional expandable graphite, flame-retardant reinforced wood-plastic composites with a multilayered sandwich structure were prepared by laminated hot pressing process and structure optimization design using poplar wood flour (WF), high-density polyethylene (HDPE), expandable graphite (EG) and nano-silicon dioxide (n-SiO₂) as the main raw materials. And the appropriate characterization and equipment such as cone calorimeter, vertical burner, limiting oxygen index tester and mechanical testing machine were used to investigate the effects of single layer, double layer and triple layer sandwich structures on the flame retardant and mechanical properties of wood-plastic composites, respectively. The experimental results showed that compared with the control wood-plastic composite (WPC-0), the multilayer structure wood-plastic composites exhibited significant reduction of peak heat release rate, total heat release rate, smoke production rate and total smoke production, and remarkable improvement of residue yield in the cone test when the contents of EG in the flame-retardant layer and n-SiO₂ in the reinforcement layer were 10% and 5%, respectively. Among all the multilayer wood-plastic composites, WPC-E3B with a triple layer sandwich structure improved its LOI from 20.8% to 30.6% and passed the UL-94 test with a V-0 rating. Moreover, it also showed better mechanical properties compared with WPC-0, such as a 61.9% increase in impact strength and 16.2% and 13.4% increases in tensile and flexural strength, respectively.
- wood-plastic composites,
- expandable graphite,
- nano-silica,
- sandwich structure,
- flame retardancy,
- mechanical properties
Long Abstrsct
Innovation Points

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References(35)

References

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