Synergistic flame-retardant and smoke suppression effect of nano-TiO2 in transparent intumescent fire-retardant coatings

doi:10.16265/j.cnki.issn1003-3033.2022.07.1535

Abstract

Abstract:

In order to improve the flame retardancy and smoke suppression efficiency of transparent intumescent fire-retardant coatings, flexible phosphate ester (PPE) and nano titanium dioxide (TiO₂) were applied as raw materials to synthesize nano-composite flexible PPE flame retardant, which was compounded with amino resin to obtain transparent intumescent fire-retardant coatings. Based on the cabinet method and tunnel method test, the synergistic effect, flame retardancy, smoke suppression and aging resistance of nano-TiO₂ in the transparent fire-retardant coatings was analyzed by Fourier transform infrared spectroscopy, smoke density instrument and scanning electron microscope. The results show that the addition of nano-TiO₂ can effectively improve the char-forming ability, flame retardancy and smoke suppression performance of the coating, and promote the formation of more cross-linking structures and aromatic structures in the combustion process of the coating, and maintain a high transmittance. When the mass ratio of PPE and nano-TiO₂ was 99.7∶0.3, the coating shows the best synergistic effect. Compared with the coating without nano-TiO₂, the flame spread ratio and smoke density of the coating decreased by 69.5% and 83.3%, respectively. The carbon residual rate reached 38.9% at 700 ℃.

Key words: transparent intumescent fire-retardant coatings, nano-TiO₂, phosphate ester (PPE), synergistic effect, flame retardant performance

YI Liang, YANG Qian, YAN Long, WANG Ning, XU Zhisheng. Synergistic flame-retardant and smoke suppression effect of nano-TiO₂ in transparent intumescent fire-retardant coatings[J]. China Safety Science Journal, 2022, 32(7): 63-69.

Figures/Tables 12

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References 16

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试样	TiPPE0	TiPPE1	TiPPE2	TiPPE3	TiPPE4
酸值/(mg KOH·g^-1)	364.3±5	348.6±5	328.3±4	304.5±5	296.1±5
m_P∶m_T	100∶0	99.9∶0.1	99.8∶0.2	99.7∶0.3	99.5∶0.5

样品编号	MTiPPE0	MTiPPE1	MTiPPE2	MTiPPE3	MTiPPE4
质量损失/g	2.5±0.5	2.4±0.3	2.1±0.2	2.0±0.2	2.3±0.2
炭化体积/cm³	22.3±0.5	18.0±0.5	13.7±0.5	11.8±0.4	16.2±0.5
火焰传播比值	23.6±0.5	19.5±0.5	12.2±0.6	7.2±0.8	15.7±1.0
膨胀倍数	45.0±3	60.0±3	97.5±5	105.0±5	72.5±2

样品	初始分解温度/℃	质量损失率/%				700 ℃时的残炭率/%
样品	初始分解温度/℃	50~210 ℃	210~330 ℃	330~540 ℃	540~700 ℃	700 ℃时的残炭率/%
MTiPPE0	194.7	5.9	21.5	31.7	8.7	32.1
MTiPPE1	194.8	6.0	20.12	32.7	7.6	33.7
MTiPPE2	196.1	4.6	19.71	32.4	9.1	34.2
MTiPPE3	234.8	2.7	19.64	32.6	6.1	38.9
MTiPPE4	198.8	5.61	18.12	30.9	14.1	37.3

Synergistic flame-retardant and smoke suppression effect of nano-TiO₂ in transparent intumescent fire-retardant coatings

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[1]	LI Yaozhuang, FENG Yuwei, XU Zhisheng, YAN Long, JIA Hongyu. Effect of clam shell bio-filler on flame retardancy and smoke suppression properties of intumescent fire retardant coatings [J]. China Safety Science Journal, 2020, 30(7): 41-47.
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[3]	YANG Jian, YIN Tubing, LIU Kewei, LIU Zhixiang, CHEN Chong. Study on factors affecting strength of tailings backfill body with response surface method [J]. China Safety Science Journal, 2017, 27(12): 103-109.