Effects of magnesium hydroxide and its synergistic systems on the flame retardance of polyformaldehyde

Liu, Yuan; Wang, Zhangyu; Wang, Qi

doi:10.1002/app.36330

Cited by 27 publications

(20 citation statements)

References 14 publications

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“…TGA is widely used to investigate the thermal stability of polymer. 31,32 Figures 5 and 6 display that the TGA and derivative thermogravimetric (DTG) curves of PP/TPU, PP/TPU/EG, and PP/TPU/EG/RPM with different amounts of RPM under a flow of nitrogen at a heating rate of 10°C min −1 , respectively. The TGA and DTG data for PP/TPU and its flame-retardant composites, including decomposition temperatures of 10% and 50% mass loss, onset temperature of TGA, and peak temperature of DTG, are listed in Table 3.…”

Section: Resultsmentioning

confidence: 99%

Synergistic effects of red phosphorus masterbatch with expandable graphite on the flammability and thermal stability of polypropylene/thermoplastic polyurethane blends

Wang

et al. 2019

Polymers and Polymer Composites

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The flammability characterization and synergistic effects of red phosphorus masterbatch (RPM) with expandable graphite (EG) in flame-retardant polypropylene (PP)/thermoplastic polyurethane (TPU) composites are investigated by limiting oxygen index, UL-94 testing, cone calorimeter tests, thermal gravimetric analysis, Fourier transform infrared (FTIR), and scanning electron microscopy. The results show that the flame retardancy of PP/TPU/EG/RPM composites is greatly influenced by RPM. The synergistic effects between RPM and EG take place in the flame-retardant composites. The presence of RPM with EG decreases significantly the heat release rates and total heat release, and UL-94 V-0 rating is achieved when suitable amount of RPM substitutes for EG in the PP/TPU/EG/RPM composites. The T onset and T 10 wt% of the composites are improved because of the presence of RPM. The FTIR spectra show that the incorporation of RPM improves the thermo-oxidative stability of PP/TPU at higher temperatures. The morphological observations indicate the reinforcement of thermal stability, and flame-retardant performance is attributed to the compact and stable char layers promoted by RPM with EG acted as an effective heat barrier and thermal insulation.

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Section: Resultsmentioning

confidence: 99%

Synergistic effects of red phosphorus masterbatch with expandable graphite on the flammability and thermal stability of polypropylene/thermoplastic polyurethane blends

Wang

et al. 2019

Polymers and Polymer Composites

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“…So far, there are still poorly understood about flame‐retardant POM. Relevant research mainly focuses on the application of flame‐retardant additives that include inorganic flame retardants (magnesium hydroxide, aluminum hydroxide, silica, clay), nitrogen‐containing compound (ME), and phosphorus‐nitrogen synergistic flame retardants (red phosphorus and ME, ammonium polyphosphate) . A high amount of inorganic flame retardants is needed to reach a satisfactory flame retardancy.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of siloxane‐containing benzoxazine and its synergistic effect on flame retardancy of polyoxymethylene

Feng

Kang

et al. 2019

Polymers for Advanced Techs

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A type of trialkoxysilane‐containing naphtholoxazine compound (Naph‐boz) was successfully synthesized and combined with ammonium polyphosphate/melamine (APP/ME) as an intumescent flame retardant (IFR) to improve the flame‐retardant efficiency of polyoxymethylene (POM). The Underwriters Laboratories 94 (UL94) vertical burning test, limiting oxygen index (LOI), cone calorimeter, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and Raman spectral analysis were used to study the flame‐retardant properties and related mechanism. The results showed that the formulation with 20 wt.% of APP, 6 wt.% of ME, and 4 wt.% of Naph‐boz passed UL94 V‐1 rating, and the LOI value was improved to 40.3%. Compared with pure POM, the IFR with Naph‐boz had greater reduction in peak heat release rate (lower 74.9%) and total heat release (lower 40.2%). SEM images showed that compact and reinforcing charred layer was formed during the POM/IFR/4Naph‐boz samples combustion, which was beneficial at reducing and maintaining low combustion parameters throughout the cone calorimeter test. The synergistic flame‐retardant effect between Naph‐boz and APP/ME was considered as the reason for the improvement in flame retardancy POM. Furthermore, because of the Naph‐boz was conducive to the compatibility between the flame retardants and matrix, the notched Izod impact strength of POM/IFR/4Naph‐boz composite was higher than that of POM/IFR system.

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“…Recently, much interest has been attracted into its application as a flame retardant [5]. Many reports have described magnesium hydroxide as a new inorganic retardant which is more effective and environment friendly than the widely used traditional inorganic retardant-aluminium hydroxide [9][10][11][12][13][14][15][16][17][18][19]. The capability of its firepreventing is usually attributed to the absorption of heat during its thermal decomposition when the produced water molecule turns from liquid state into gas phase.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Different Diameter Nano-Mg(OH)₂Powders and Their Non-isothermal Kinetics of Thermal Decomposition

et al. 2014

Integrated Ferroelectrics

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The 0.1 mol•L −1 MgSO 4 liquor and 5 mol•L −1 NaOH liquor were prepared by MgSO 4 ·5H 2 O and NaOH as raw materials, and then different diameter nano-Mg(OH) 2 powders were prepared by chemical precipitation. The DTA-TG curves data obtained was by SDT 2960 simultaneous DSC-TGA analysis apparatus. The mensuration conditions were that rise temperature velocity was 15 • C·min −1 , gas was air. The kinetics was calculated by DTA-TG curves data and dα dt = k(1−α) n kinetics model. The results shown that nano-Mg(OH) 2 powders shape were stick or spherical, their diameter were 7, 12, 20, 40, 70 nm. Their thermal decomposition reaction apparent activation energies were 188. 065, 195.935,202.493, 210.178, 297.527KJ·mol −1 , the apparent activation energy increase with Mg(OH) 2 diameter. Their frequency factors were 2.721 × 10 15 , 9.246 × 10 15 , 4.251 × 10 16 , 6.067 × 10 16 , 3.866 × 10 23 , the frequency factors increase with diameter Mg(OH) 2 . Their reaction progression were 0.8296, 0.9321, 0.8743, 1.0275, 0.8903, the reaction progressions were fluctuated in 0.9108 (average) about.

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Effects of magnesium hydroxide and its synergistic systems on the flame retardance of polyformaldehyde

Cited by 27 publications

References 14 publications

Synergistic effects of red phosphorus masterbatch with expandable graphite on the flammability and thermal stability of polypropylene/thermoplastic polyurethane blends

Synergistic effects of red phosphorus masterbatch with expandable graphite on the flammability and thermal stability of polypropylene/thermoplastic polyurethane blends

Synthesis of siloxane‐containing benzoxazine and its synergistic effect on flame retardancy of polyoxymethylene

Preparation of Different Diameter Nano-Mg(OH)₂Powders and Their Non-isothermal Kinetics of Thermal Decomposition

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Effects of magnesium hydroxide and its synergistic systems on the flame retardance of polyformaldehyde

Cited by 27 publications

References 14 publications

Synergistic effects of red phosphorus masterbatch with expandable graphite on the flammability and thermal stability of polypropylene/thermoplastic polyurethane blends

Synergistic effects of red phosphorus masterbatch with expandable graphite on the flammability and thermal stability of polypropylene/thermoplastic polyurethane blends

Synthesis of siloxane‐containing benzoxazine and its synergistic effect on flame retardancy of polyoxymethylene

Preparation of Different Diameter Nano-Mg(OH)2Powders and Their Non-isothermal Kinetics of Thermal Decomposition

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Preparation of Different Diameter Nano-Mg(OH)₂Powders and Their Non-isothermal Kinetics of Thermal Decomposition