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Monday, 23 September 2019
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Raw materials & technologies, Raw materials

Microencapsulated ammonium polyphosphate with boron-modified phenolic resin

Monday, 9 May 2016

Researchers from China University of Petroleum, Beijing, prepared microencapsulated ammonium polyphosphate that might be used as an intrinsic flame retardants in coatings.

Microencapsulated ammonium polyphosphate with boron-modified phenolic resin. Source: Henrik Gerold Vogel/pixelio.de

Microencapsulated ammonium polyphosphate with boron-modified phenolic resin. Source: Henrik Gerold Vogel/pixelio.de

Ammonium polyphosphate (APP) was encapsulated with boron-modified phenolic resin (BPF) by in situ polymerisation with the goal of improving its hydrophobicity, thermal stability, and compatibility in polymers. The chemical and physical features of APP microcapsules were characterised by Fourier transform infrared, X-ray photoelectron spectroscopy, scanning electron microscopy, inductively coupled plasma, and laser particle sizing. The hydrophobicity was assessed by the water contact angle. The residues from thermogravimetric analyser and muffle burner were investigated.

Particle size distribution became more narrow

The results showed that the APP microcapsules with BPF shell had been achieved successfully. The shell encapsulation rate mainly depended on the amount of crosslinking agent when the ratio of APP/BPF was constant. The mean particle size increased and the particle size distribution became more narrow. The hydrophobicity of APP was improved and the improvement degree mainly depended on the amount and adding rate of crosslinking agent and the conditions of heat curing. A good thermal stability and high residue char rate at high temperature were noticed for APP microcapsules. It suggests that these microcapsules might be used as an intrinsic flame retardant.

The study is published in: Journal of Applied Polymer Science, Volume 133, Issue 30, August 10, 2016

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