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Chinese Journal of Materials Research  2021, Vol. 35 Issue (6): 449-457    DOI: 10.11901/1005.3093.2020.209
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Preparation of Halloysite Based Layer-by-Layer Coating on Flexible Polyurethane Foam and Its Performance of Flame Retardant and Smoke Suppression
PAN Ying, ZHAO Hongting()
College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
Cite this article: 

PAN Ying, ZHAO Hongting. Preparation of Halloysite Based Layer-by-Layer Coating on Flexible Polyurethane Foam and Its Performance of Flame Retardant and Smoke Suppression. Chinese Journal of Materials Research, 2021, 35(6): 449-457.

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Abstract  

The halloysite based coating was fabricated on the surface of flexible polyurethane foam (PUF) using layer-by-layer self-assembled method, which then was characterized by scanning electron microscope (SEM) with energy-dispersive X-ray (EDX) spectrometers, thermogravimetric analysis and cone test. The effect of the prepared coating on the performance of the coated PUF, such as thermal stability, flame retardancy and smoke suppression were investigated. The results show that the coating is composed of halloysite, sodium alginate and polyethyleneimine. The halloysite particles were uniformly dispersed in the coating on PUF. Due to the presence of halloysite based coating, the decomposition of the coated PUF could be retarded to certain extent at high temperature, hence the char residues were significantly increased while decomposed. In comparison to the bare PUF, the peak heat release rate, peak smoke production rate and total smoke production were reduced 57.3%, 58.9% and 80.7% respectively for the PUF with halloysite based coating. This indicated that the coating (namely PU-3) could enhance the thermal stability and fire safety.

Key words:  composite      flexible polyurethane foam      layer-by-layer self-assembly      flame retardancy     
Received:  04 June 2020     
ZTFLH:  TQ328.3  
Fund: Zhejiang Province Natural Sciences (Youth) Foundation(LQ19E030018)
About author:  ZHAO Hongting, Tel: 13656631588, E-mail: info-iem@hdu.edu.cn

URL: 

https://www.cjmr.org/EN/10.11901/1005.3093.2020.209     OR     https://www.cjmr.org/EN/Y2021/V35/I6/449

Fig.1  Schematic of construction of halloysite based layer-by-layer coating on PUF
Sample

PEI

(mass fraction, %)

Halloysite

(mass fraction, %)

Alginate

(mass fraction, %)

BL

Weight gain

(mass fraction, %)

PU-0----0
PU-10.51.00.316.7
PU-20.51.00.3216.1
PU-30.51.00.3329.1
Table 1  Concentration of dipping solution and mass gain of the coated PUF with different BL number are listed
Fig.2  SEM images of PU-0 (a, e, i), PU-1 (b, f, j), PU-2 (c, g, k) and PU-3 (d, h, l)
Fig.3  EDX spectra of PU-0 (a) and PU-3 (b)
Fig.4  TG (a) and DTG (b) curves of PU-0, PU-1, PU-2 and PU-3 at air atmosphere
SampleT-5%/℃Tmax1/℃Tmax2/℃

Residue at 700℃/%,

mass fraction

PU-02652993848.1
PU-126530140110.3
PU-226430040715.7
PU-326129840921.5
Table 2  TGA data of the PUF under nitrogen atmosphere
Fig.5  HRR (a), THR (b), SPR (c) and TSR (d) curves of PU-0, PU-1, PU-2 and PU-3
Fig.6  Photo of char residues of PU-0 (a), PU-1 (b), PU-2 (c) and PU-3 (d) after cone test and (e) mass loss of PU foams during cone test
Fig.7  SEM images of PU-1 (a, d), PU-2 (b, e) and PU-3 (c, f) after cone tests
Fig.8  Real-time images of burning tests for PU-0 (a, b), PU-1 (c, d, e), PU-2 (f, g, h) and PU-3 (i, j, k). 10 s after ignition (a, c, f, i), 30 s after ignition (b, d, g, j) and char residues after burning (e, h, k)
Fig.9  3D TG-FTIR spectra of gasified pyrolysis products for (a) PU-0 and (b) PU-3
Fig.10  Intensity of characteristic peak for pyrolysis products of PU-0 and PU-3
Fig.11  Model of smoke generation from the burning treated PU foam
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