Influence of zinc borate on the flame retardancy and thermal stability of intumescent flame retardant polypropylene composites

Cao, Feng; Zhang, Yi; Liang, Dong; Liu, Siwei; Chi, Zhenguo; Xu, Jiarui

doi:10.1016/j.jaap.2015.07.019

Cited by 70 publications

(55 citation statements)

References 36 publications

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“…1 In the literature, ZnB was used solely as flame retardant additive in polyvinylchloride 2,3 and polyurethane. 4 It was used as synergistic additive with intumescent, [5][6][7][8][9] phosphorus, [10][11][12][13][14][15] silicon, 16 and mineral-based flame retardants [17][18][19][20][21][22] in various matrix materials including polypropylene (PP), 5,6,8,9,17,19 polyethylene, 7 polycarbonate, 10,15,16 poly(methyl methacrylate), 11 epoxy resin, 12 polyamide, 13,14 ethylene propylene diene copolymer, 18 and ethylene vinyl acetate (EVA). [20][21][22] Huntite-hydromagnesite (HH), a naturally occurring mixed mineral, is mineral-based flame retardant like aluminum hydroxide (ATH) and magnesium hydroxide (MH).…”

Section: Introductionmentioning

confidence: 99%

Influence of zinc borate on flame retardant and thermal properties of polyurethane elastomer composites containing huntite‐hydromagnesite mineral

2017

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Summary The effect of zinc borate (ZnB) was studied on the flame retardant and thermal properties of thermoplastic polyurethane containing huntite‐hydromagnesite. The flame retardant properties of thermoplastic polyurethane–based composites were investigated using limiting oxygen index, vertical burning test (UL 94), thermogravimetric analysis, and mass loss calorimeter. No remarkable effect of ZnB was observed on the flammability properties of composites. UL 94 rating did not change regardless of the added amount of ZnB, and the slight increase in limiting oxygen index value was observed at ratio of 1:1. The adjuvant effect of ZnB was observed during the mass loss calorimeter studies by increasing the barrier effect of the residue in the condensed phase and by increasing the formation of incombustible gasses in the gas phase. The highest fire performance was achieved at ratio of 1:1.

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Section: Introductionmentioning

confidence: 99%

Influence of zinc borate on flame retardant and thermal properties of polyurethane elastomer composites containing huntite‐hydromagnesite mineral

2017

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“…Third, zinc borate would decompose to form ZnO, B 2 O 3 , and water vapor during combustion process. The B 2 O 3 would participate to form cross‐link network in the formed char residues and thus enhance the compactness of char residues . Consequently, the improved char residues coated on the surface of SiFs could further enhance the flame retardancy properties by effectively preventing the permeability of oxygen gas and hindering the heat diffusion into the flame zone.…”

Section: Resultsmentioning

confidence: 99%

“…On the basis of the above analysis, a possible flame-retardant mechanism of MAHP/ZB in SiFs is summarized in Figure 14 participate to form cross-link network in the formed char residues and thus enhance the compactness of char residues. 49 Consequently, the improved char residues coated on the surface of SiFs could further enhance the flame retardancy properties by effectively preventing the permeability of oxygen gas and hindering the heat diffusion into the flame zone. Furthermore, the water vapor released would act as protective gas layer by diluting the volatile gas.…”

Section: Flame-retardant Mechanismmentioning

confidence: 99%

Flame retardancy and smoke suppression of silicone foams with microcapsulated aluminum hypophosphite and zinc borate

Kang

Wang

Deng

et al. 2020

Polymers for Advanced Techs

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The flame‐retardant microcapsules were successfully fabricated with an aluminum hypophosphite (AHP) core. Fourier transform infrared (FTIR) and X‐ray photoelectron spectroscopy (XPS) were used to verify that AHP was encapsulated in the microcapsules, and thermogravimetry analysis showed that microencapsulated AHP (MAHP) possessed higher thermal stability than that of AHP. Then, a flame‐retardant and smoke suppression system for silicone foams (SiFs) was obtained through a synergistic effect of MAHP and zinc borate (2ZnO·3B2O3·3.5H2O). The mechanical properties, flame retardance, and smoke suppression of SiFs with MAHP and zinc borate were tested using the tensile test, limiting oxygen index (LOI) test, UL‐94 test, and cone calorimeter test. The mechanical properties indicated that the tensile strength and elongation at break of SiFs could evidently improve with the incorporation of MAHP. Compared with pure SiF, SiF8 with 4.5‐wt% MAHP and 1.5‐wt% zinc borate could achieve an LOI value of 30.7 vol% and an UL‐94 V‐0 rating, the time to ignition amplified almost six times, the peak heat release rate and total heat release were 51.10% and 46.00% less than that of pure SiF, respectively, the fire performance index increased nearly 13 times, and the fire growth index value was only 13.18% of pure SiF. Moreover, the partial substitution of zinc borate imparted a substantial improvement in both flame retardancy and smoke suppression. Especially, the peak smoke production rate and total smoke production of SiF8 were merely 38.46% and 38.84% of pure SiF.

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“…The flammability of polymers is of importance as this limit their functionality as fire protection materials. In recent years, flame‐retardants (FR) have aroused a great attention and been considered as most promising candidates to substitute halogen‐containing flame‐retardants due to its environmental friendly properties . Reduction in flammability is obtained by incorporation of various fillers and additives that can act in various modes.…”

Section: Introductionmentioning

confidence: 99%

Flame‐retardancy and physico‐thermomechanical properties of irradiated ethylene propylene diene monomer inorganic composites

Raslan

Elnaggar

Fathy³

2017

Vinyl Additive Technology

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The ethylene propylene diene terpolymer (EPDM)/flameretardant composites filled with aluminum hydroxide (ATH), magnesium carbonate (MgC) and zinc borate (ZnB) were prepared at different contents 15, 30, and 40 wt%, and irradiated with different gamma radiation doses, namely 50 and 100 kGy. Mechanical properties, Thermogravimetric analysis (TGA), limiting oxygen index (LOI) and swelling in motor and brake oils of the prepared composites were evaluated. Experimental results emphasized that flame resistant particles retard degradation and flammability of the composites. It has been established that the results showed that the particle size of inorganic fillers clearly have a significant effect on the whole properties of the prepared polymer composites hence zinc borate was the best. Moreover, significant alterations in characterization of polymer composites characters have been occurred due to irradiation remarkably at a dose of 50 kGy. J. VINYL ADDIT. TECHNOL., 00:000-000,

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Influence of zinc borate on the flame retardancy and thermal stability of intumescent flame retardant polypropylene composites

Cited by 70 publications

References 36 publications

Influence of zinc borate on flame retardant and thermal properties of polyurethane elastomer composites containing huntite‐hydromagnesite mineral

Influence of zinc borate on flame retardant and thermal properties of polyurethane elastomer composites containing huntite‐hydromagnesite mineral

Flame retardancy and smoke suppression of silicone foams with microcapsulated aluminum hypophosphite and zinc borate

Flame‐retardancy and physico‐thermomechanical properties of irradiated ethylene propylene diene monomer inorganic composites

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