Abstract
Melamine formaldehyde (MF) foam is kind of fire-retardant material and has great potential in acoustic and thermal insulation area. In this article, MF resin foam was prepared by microwave radiation. We discussed the thermal stability of MF foam and the effect of different emulsifiers on its morphology, apparent density, fire-retardancy and mechanical property. The decomposition temperature of MF foam we prepared is nearly 400℃ and the constitution of residue after combustion is made up of carbon and graphite. Emulsifier influenced the apparent density of MF foam and using coemulsifiers can get flexible foam with uniform cell size, good morphology and low apparent density. When the fire-retardant MF foam’s apparent density is low of 5.53 kg/cm-3, its value of LOI can reach 32.4. The mechanical property of foam is consistent with apparent density.
Highlights
Melamine formaldehyde (MF) foam is a kind of thermosetting plastic and has attracted much attention all over the world
In the IR spectrum of MF resin foam without aging and MF foam aging 2h in 120°C, it appears a new peak at 3440 cm-1, which represents the stretching vibration of O-H and N-H band with the peak of primary amine disappeared
Through the analysis of emulsifier influenced on MF foam morphology, apparent density and compressive modulus changes as well as fire-retardancy we got that emulsifier is very important to the foaming process
Summary
MF foam is a kind of thermosetting plastic and has attracted much attention all over the world. Can produce flexible MF foam [2] This kind of MF foam has a skeleton of length/diameter (L/D) to 15 or even higher and can be practically used in acoustic area [3,4] due to its three-dimensional network structure and high cell-opening ratio. Different kinds of emulsifiers had different fields of application and apparent density caused by emulsifiers will affect the fire-retardancy and mechanical property. We discussed the cell morphology with different emulsifiers under the radiation of microwave and apparent density, fire-retardancy and mechanical property caused by emulsifiers. These experimental results will provide significant theoretical foundation for producing superior MF foam
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