Preparation and Application for EPS Foam of Melamine-Bis[Tetrakis (Hydroxymethyl) Phosphonium] Sulfate Flame Retardant

doi:10.11901/1005.3093.2017.336

Chinese Journal of Materials Research

2018, Vol. 32

Issue (8): 584-590 DOI: 10.11901/1005.3093.2017.336

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Preparation and Application for EPS Foam of Melamine-Bis[Tetrakis (Hydroxymethyl) Phosphonium] Sulfate Flame Retardant

Zhengzhou WANG^1,²(

), Ting YANG¹, Lifei HU¹

1 School of Materials Science and Engineering, Tongji University, Shanghai 200092, China
2 Key laboratory Advanced Civil Engineering Materials, Ministry of Education (Tongji University), Shanghai 200092, China

Cite this article:

Zhengzhou WANG, Ting YANG, Lifei HU. Preparation and Application for EPS Foam of Melamine-Bis[Tetrakis (Hydroxymethyl) Phosphonium] Sulfate Flame Retardant. Chinese Journal of Materials Research, 2018, 32(8): 584-590.

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Abstract

The flame retardant of melamine-bis[tetrakis (hydroxymethyl) phosphonium] sulfate (MTHPS) was synthesized via reflux reaction with tetrakis hydroxymethyl phosphonium sulfate and melamine as raw materials and then characterized by FTIR and NMR. Beads of pre-expandable polystyrene (EPS) were coated with the MTHPS containing thermosetting phenolic resin, and then with which as raw material, the halogen-free flame retardant EPS foam was prepared via steam foaming and molding process. The effect of MTHPS-content on the flame retardancy, mechanical properties and thermal conductivity of the EPS foams were assessed. It is found that the flame-retardant EPS foam with 50 phr MTHPS presents a limiting oxygen index 34.0% and a V-0 rating for vertical flammability test according to the UL 94 standard. The compressive strength and flexural strength of the flame retardant foam increase with the increasing MTHPS content.

Key words: organic polymer materials expandable polystyrene foam MTHPS flame retardation

Received: 31 August 2017

ZTFLH:

TB324

Fund: Supported by National Natural Science Foundation of China (No. U1205114)

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	Zhengzhou WANG
	Ting YANG
	Lifei HU

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.336 OR https://www.cjmr.org/EN/Y2018/V32/I8/584

Table 1 Formulations of THPSM flame retardant EPS foam

Fig.1 FTIR of melamine (a) and MTHP (b)

Fig.2 Nuclear magnetic resonance carbon spectrum of MTHPS

Fig.3 Synthetic route of MTHPS

Table 2 LOI and UL 94 test results of MTHPS flame retardant EPS foams

Fig.4 HRR curve of foams

Fig.5 Carbon photographs of foam samples E0 (a); EPR (b) and S4 (c) after cone calorimetry

Fig.6 Effect of MTHPS loading on flexible strength of flame retardant EPS

Fig.7 Effect of MTHPS loading on compressive strength of flame retardant EPS

Fig.8 TG curve (a) and DTG curve (b) of MTHPS

Fig.9 TGA curve (a) and DTG curve (b) of foam samples

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