Effect of oleic acid on improving flame retardancy of brucite in low‐density polyethylene composite

Abstract

Brucite was modified with oleic acid (OA) and the effect of OA on flame retardancy of brucite in low-density polyethylene (LDPE) composites was investigated. Fourier transform infrared spectroscopy, X-ray diffraction, and particle size analysis were used to examine the structural changes of the OA modified brucite. Flammability of the LDPE/brucite composites with different OA content was characterized by thermogravimetric analysis, limiting oxygen index (LOI), UL-94 test, and microscale combustion calorimetry. The results showed that when brucite was modified with OA, magnesium oleate was formed on the brucite surface. The brucite particle size and the relative intensity of the (101) diffraction peak of brucite decreased. When the content of OA and brucite in the composite were 6 and 40 phr respectively, the prepared LDPE composite displayed better flame retardancy than the corresponding OA free LDPE composite: the LOI value increased from 22.2% to 24.9%, and the peak heat release rate decreased from 678 to 546 kW/m 2 . The influence of OA on the improvement of flame retardancy of brucite in LDPE/brucite composite was due to the efficient dispersion of brucite in LDPE matrix and the structural changes of brucite, caused by the reaction of OA with brucite.

Application of the PAPP/MCA/APP intumescent flame retardant system in polypropylene

“…12,13 However, high flame retardancy can be achieved only when the amount of these halogen-free flame retardants added to the polymer is high in some cases. [14][15][16][17] As reported in literature, the prepared PP composite cannot reach the UL-94 V0 level even when the addition amount of APP reached 30%. 18 Such a high addition amount directly leads to a significant decrease in the mechanical properties of polymer materials.…”

“…Ammonium polyphosphate (APP), piperazine pyrophosphate (PAPP), Al(OH) 3 , Mg(OH) 2 , melamine cyanurate (MCA) and others are all commercial halogen‐free flame retardants 12,13 . However, high flame retardancy can be achieved only when the amount of these halogen‐free flame retardants added to the polymer is high in some cases 14–17 . As reported in literature, the prepared PP composite cannot reach the UL‐94 V0 level even when the addition amount of APP reached 30% 18 .…”

Flame retardancy ofbiodegradablepolylactic acid with piperazine pyrophosphate and melamine cyanurate as flame retardant

“…11,12 Lots of halogen-free flame retardants, including magnesium hydroxide, melamine polyphosphate, phytic acid, ammonium polyphosphate (APP), 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide derivatives (DOPO), aluminum hypophosphite (AHP), and so on, can be applied in PLA. [13][14][15][16][17] During the combustion process, the decomposition products of these flame retardants enter the gas phase or condensed phase to prevent the continuous combustion of PLA, leading to the good flame retardancy of the PLA composites. [18][19][20] Usually, to achieve the good flame retardancy effect, the loading of flame retardant is above 20%, which can greatly reduce the mechanical properties of PLA composites.…”

Preparation of DOPO‐derived magnesium phosphate whisker and its synergistic effect with ammonium polyphosphate on the flame retardancy and mechanical property of epoxy resin

“…Lots of additive flame retardants have been developed and most of these flame retardants contain some elements, including halogen, phosphorus, magnesium, nitrogen, aluminum, and so forth 9–16 . With the decomposition of flame retardants during the burning process, the formation of the protective layer, the absorption of the released heat, and the generation of non‐flammable gases can efficiently improve the flame retardancy of materials 17–19 .…”