Reinforcing Condensed Phase Flame Retardancy through Surface Migration of Brucite@Zinc Borate-Incorporated Systems

Chen, Wendan; Li, Honghui; Li, Lü; Wang, Xuesong

doi:10.1021/acsomega.0c03916

Cited by 7 publications

(3 citation statements)

References 47 publications

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“…HRR and its peak PHRR are usually considered as the most effective and important parameters for reflecting the flame performance of materials [ 21 ]. Moreover, PHRR and THR are also important indicators.…”

Section: Resultsmentioning

confidence: 99%

Effects of different types of flame-retardant treatment on the flame performance of polyurethane/wood-flour composites

Wang

Zhao

et al. 2023

Heliyon

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Section: Resultsmentioning

confidence: 99%

Effects of different types of flame-retardant treatment on the flame performance of polyurethane/wood-flour composites

Wang

Zhao

et al. 2023

Heliyon

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“…Under air atmosphere, the This is because the thermal stability of the carbon layer produced by the first thermal degradation is poor, and the secondary oxidation reaction has occurred. 17,20 After the first degradation, the residual carbon loses weight again, and a broad weight loss peak appears, while the degraded EP composite material loses weight slowly under nitrogen atmosphere, and gradually tends to be flat. Moreover, compared with pure EP, the carbon residue of EP composites significantly increased.…”

Section: Tg Characterization Of B-hibd and Hibdmentioning

confidence: 99%

Synthesis of a novel type of high‐efficiency boron‐containing Schiff base flame retardant for epoxy resin

Guo

et al. 2022

Fire and Materials

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Boron-containing Schiff base flame retardant ((E)-2-([2,4-dihydroxybenzylidene]amino) ethyl dihydrogen borate (B-HIBD) was prepared easily and successfully. Thermogravimetric analysis (TGA) showed that when the additive amount was only 3 wt%, the introduction of B-HIBD significantly improved the thermal stability of epoxy resin (EP) composites. The cone calorimeter test showed that compared with pure EP, the peak of heat release rate (PHRR), total heat release (THR), smoke production rate (SPR)，total smoke production (TSP) ，and the releasing of CO for 3 wt% B-HIBD/EP reduced by 58.2, 18.3, 65.9, 51.2, and 28.4%, respectively, showing that B-HIBD could significantly enhance the fire safety of EP composites. This promotion has been embodied not only in the catalysis function of the Schiff base group containing benzene ring but also in borate participating in the carbon-forming process, promoting the dehydration and carbonization of the EP surface and delaying the transfer of mass and heat in the combustion process, which enhance performance for flame retardant. So it is an efficient strategy to develop a novel type of high-efficiency boron-containing Schiff base flame retardant to improve the fire safety for EP. K E Y W O R D S borate, boron-containing Schiff base, EP composites, fire safety, flame retardant mechanism 1 | INTRODUCTION Epoxy resin(EP) has been utilized widely in the fields of adhesive, coating, laminate, automotive, and construction industries due to its superior adhesion，insulation，mechanical toughness, and chemical resistance. However, EP has poor fire performance, which produces serious security risks and limits its industrial application. 1-4 Over recent decades, polymer materials have been required to meet the characteristics of good flame retardancy, flexible structure, and easy chemical modification. The development of new flame retardants is of great significance for the realization of long-term high-efficiency flame retardancy for polymer materials. Schiff base is a class of organic compounds obtained by dehydration condensation reaction of amine and aldehyde compound, containing functional imine group R 1 R 2 C=NR 3 . 5-8 Recently, great interest has risen in Schiff base group containing aromatic ring for flame retar-dant，which improves the thermal stability of EP effectively, enhances hydrogen bonding ability in thermal degradation process, and has an obvious carbonization tendency, which plays an important role in promoting the formation of residue char. 9 Wu et al. 10 designed a novel aromatic Schiff base "5-(benzylidene-amino)-isophthalic acid dimethyl ester (BA) as a self-crosslinking monomer of PET. It is found that BA n PETs can effectively enhance the char formation and has excellent flame retardancy property and non-dripping behavior. Magdy et al. 11 used Vanillin-Schiff's bases (VSB) as thermal stabilizers and co-stabilizers in air at 180 C for PVC (Polyvinyl chloride). It is found that VSB can impart high-efficiency thermal stability to PVC. In addition, Salen-based Schiff base...

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“…Moreover, ZB decomposes at high temperatures to form boron oxide, softened by heat and transforming into boron-containing glassy expansion coating. [36] The coating prevents heat exchange and flammable gases from escaping.…”

Section: Introductionmentioning

confidence: 99%

Preparation of melamine borate coated red phosphorus microcapsules and use of zinc borate as synergistic flame retardant in polyethylene

Liu

Zeng

et al. 2022

Vinyl Additive Technology

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Microcapsules (Mic-MBP) based on the melamine borate coated red phosphorus (RP) were prepared, and its synergistic flame retardant with zinc borate (ZB) on polyethylene (PE) was investigated. The flame retardant properties of the PE/20% Mic-MBP/10%ZB were superior to that of PE/20%RP/10%ZB. Furthermore, the limiting oxygen index of PE/20%Mic-MBP/10%ZB was 25.2%, and PE/20%Mic-MBP/10%ZB reached the UL-94V-0 rating. Compared with PE, the peak heat release rate (pk-HRR), total heat release (THR) and average effective heat of combustion (av-EHC) of PE/20%Mic-MBP/10%ZB had decreased. In addition, the flame retardant mechanism was investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), pyrolysis-gas chromatography-mass spectrometry (PY-GC-MS) and Fourier transform infrared spectroscopy (FT-IR). The results showed that the residual char of PE/20%Mic-MBP/10%ZB had thermal stability, and the formation of phosphorus free radicals and nonflammable gases effectively reduced the burning intensity of the gas phase. It indicated that Mic-MBP/ZB showed a condensed and gas phase flame retardant effect.

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Reinforcing Condensed Phase Flame Retardancy through Surface Migration of Brucite@Zinc Borate-Incorporated Systems

Cited by 7 publications

References 47 publications

Effects of different types of flame-retardant treatment on the flame performance of polyurethane/wood-flour composites

Effects of different types of flame-retardant treatment on the flame performance of polyurethane/wood-flour composites

Synthesis of a novel type of high‐efficiency boron‐containing Schiff base flame retardant for epoxy resin

Preparation of melamine borate coated red phosphorus microcapsules and use of zinc borate as synergistic flame retardant in polyethylene

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