Utilization of Magnesium Hydroxide Produced by Magnesia Hydration as Fire Retardant for Nylon 6-6,6

Abstract

Abstract:The present work investigates the use of magnesium hydroxide, produced by magnesia hydration, as a fire retardant in polymers. The hydration was carried out in an autoclave, at temperature of 130°C for 1 hour, and the product was further submitted to cominution in a jet mill. The solids were characterized with regard to their chemical composition, particle size distribution, surface area and morphology. The performance evaluation of the hydroxide as a flame retardant for a copolymer of nylon 6-6,6 was carried out according to the UL94 specifications for vertical burning tests. V-0 flammability rating at 1.6 mm (60% magnesium hydroxide-filled nylon composite) and at 3.2 mm (40% magnesium hydroxide filled nylon composite) were achieved. Mechanical properties were maintained at the desired values. These results indicate that the hydroxide obtained from magnesia hydration can be successfully employed as a fire retardant for nylon 6-6,6.

A systemic investigation on the hydroxylation behavior of caustic magnesia and magnesia sinter

“…Depending on the application aimed at, MgO hydroxylation can be either valuable or undesired and, in both cases, the knowledge of how this process occurs can be highly useful. The hydroxylation process must be efficient for the production of fertilizers [1,18], animal and human nutrition [1,27], watertreatment input [1,28], medicaments [1,27,28], fast-hardening Sorel and MgO-based cements [1,[29][30][31] and anti-flame agents for polymer composites [32][33][34] and generates particles of controllable size distribution, specific surface area and shape at competitive costs. On the other hand, it must be avoided or at least minimized in applications to refractory [10,13,14,16,[35][36][37][38][39][40] and abrasive [1] materials and optic and electronic devices.…”

“…8j). Studies have demonstrated this reaction can produce other compounds, as aluminum-magnesium double layered hydroxide, known as hydrotalcite [36,45,47,48], or particles of suitable morphology to act as mechanical reinforcement in polymeric composites [27,32,33,34].…”

Kinetics and mechanistic analysis of caustic magnesia hydration

“…Magnesium hydroxide has found several industrial applications typically ranging from pulp and paper production to the fields of pharmaceutical and wastewater treatment, for example. In recent years, there has been observed also a growing interest concerning the use of magnesium hydroxide powders as flame retardant and smoke‐suppressing additives to produce polymers 1, 2. The application of magnesium hydroxide as a flame retardant requires a very high quality Mg(OH) 2 powder with regard both to chemical purity and physical properties of the solid such as particle size, surface area, morphology, etc.…”

Kinetic study of photocatalytic degradation of Ifos famide in a microchannel and simulation

“…HM is a relevant magnesium material that has broad applicability, from flame retardant for polymers to neutralizing agent for effluent treatment. Its use as neutralizing agent is increasing in some countries because magnesium hydroxide has a high alkalinity (27%) when compared to traditional agents (calcium and sodium hydroxide) [19,20,21,22].…”