The Combined Action of Huntite and Hydromagnesite for Reducing Flammability of an Ethylene-Propylene Copolymer

Touré, Birane; Lopez-Cuesta, J. M.; Benhassaine, A.; Crespy, A.

doi:10.1080/10236669608233909

Cited by 23 publications

(5 citation statements)

References 4 publications

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“…[20][21][22] Huntite-hydromagnesite (HH), a naturally occurring mixed mineral, is mineral-based flame retardant like aluminum hydroxide (ATH) and magnesium hydroxide (MH). 23,24 The flame retardant behavior of HH is studied in various polymers such as EVA, [25][26][27][28][29][30][31] PP, 29 polyethylene, 32 ethylene propylene copolymer, 33 vinyl ester resin, 34 polyvinylchloride, 35 and thermoplastic polyurethane (TPU). 36,37 The general flame retardant mechanism of HH resembles to those of ATH and 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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“…The first [74] of the two studies gives details of the fire retardant effects of a blend of natural hydromagnesite and huntite with a 40:60 ratio. DTA measurements show how the polymer decomposes in nitrogen at between 400°C and 500°C and that the blend of hydromagnesite and huntite has endothermic decompositions above and below the polymer decomposition temperature.…”

Section: Effect Of Hydromagnesite / Huntite Mixtures On the Burning Bmentioning

confidence: 99%

The fire retardant behaviour of huntite and hydromagnesite – A review

Hollingbery

Hull

2010

Polymer Degradation and Stability

133

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Naturally occurring mixtures of hydromagnesite and huntite have found important industrial use. Their endothermic decomposition over a temperature range similar to that of commonly used polymers and their release of water and carbon dioxide, has led to such mixtures being successfully used as fire retardants. They have replaced aluminium hydroxide and magnesium hydroxide in many applications. The current understanding of the thermal decomposition mechanism of both minerals and their combination in natural mixtures has been reviewed and related to their fire retardant action. Both minerals contribute to the reduction in flammability of polymers although the extent of these interactions has not been fully investigated. However, the fire retardant mechanism of these minerals appears more complicated than either aluminium hydroxide or magnesium hydroxide. This paper critically examines the literature on the fire retardant behaviour of mixtures of hydromagnesite and huntite, providing information of particular use to formulators of fire retardant polymers using these minerals. It also highlights the gaps in understanding of the fire retardant mechanisms of mixtures of hydromagnesite and huntite and areas that require further research.

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“…16,17 The release of CO 2 also dilutes the oxygen concentration in the atmosphere and further slows the spread of fire. 17,18 The small improvement is considered good since the amount of dolomite is also small, i.e., up to 15 wt%. According to Mouritz and Gibson, most polymers required a high content of filler to show improvement in flammability effectively.…”

Section: Limiting Oxygen Indexmentioning

confidence: 99%

Flammability, Thermal and Mechanical Properties of Polybutylene Terephthalate/Dolomite Composites

Saidi¹,

Mazlan²,

Hassan³

et al. 2019

JPS

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The objective of this study is to determine the effects of dolomite content on flammability, thermal and mechanical properties of polybutylene terephthalate (PBT)/ dolomite composites. PBT and dolomite were blended together at different dolomite contents (5 wt%, 10 wt% and 15 wt%) via twin screw extruder prior to injection moulding. Limiting oxygen index (LOI) test was used to determine the flammability of the PBT composites. Degree of crystallisation (X c), glass transition (T g), melting (T m) and crystallisation (T c) temperatures were obtained using differential scanning calorimetry (DSC). Three types of mechanical tests were carried out, i.e., flexural, tensile and Izod impact. Morphological study was characterised using scanning electron microscope (SEM). LOI analysis showed that the incorporation of dolomite reduced the flammability of PBT composites. DSC results showed that dolomite has marginal effect on T g and T m of the PBT composites. On the other hand, T c and X c increased with increasing dolomite content which indicates that it can be used as a nucleating agent. The presence of dolomite increased the flexural properties, tensile strength and Young's modulus of PBT composites. However, the elongation at break and impact strength were significantly decreased due to poor adhesion between dolomite and PBT. PBT/D-15 composite was found to have the optimum mechanical properties compared with other PBT/dolomite composites. SEM micrograph revealed that dolomite is uniformly distributed at lower dolomite content but agglomerated at higher content.

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The Combined Action of Huntite and Hydromagnesite for Reducing Flammability of an Ethylene-Propylene Copolymer

Cited by 23 publications

References 4 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

The fire retardant behaviour of huntite and hydromagnesite – A review

Flammability, Thermal and Mechanical Properties of Polybutylene Terephthalate/Dolomite Composites

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