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Dependence of the air-drying exothermic effect on the double bond in alkyd resins

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Abstract

The widely used alkyd resin suffers not only the flammability but also the autoignition of resin waste. Its autoignition should result from the air-drying exothermic effect due to autoxidation and conversion of double bond. However, the air-drying exothermic effect is seldom studied. In this study, five soybean oil-based alkyd resins were synthesized. The content of double bond measured by the titration method increased linearly with increasing the molar fraction of maleic anhydride. After air-drying, the infrared spectroscopy absorption peak for the double bond disappeared. Considering that the curing originated from the conversion of chemical bonds, the exothermic effect was theoretically analyzed to be 1163–1455 kJ mol−1 double bond based on the air-drying mechanisms and the differences among chemical bond energies. According to thermodynamics principles, the air-drying exothermic effect was also derived from the measured heat of combustion. When the content of double bond increased from 2.19 mol kg−1 resin to 2.56 mol kg−1 resin, the exothermic effect linearly increased from 1352 kJ mol−1 double bond or 2.96 kJ g−1 resin to 2508 kJ mol−1 double bond or 6.42 kJ g−1 resin. The steady and unsteady autoignition theoretical analyses implied that due to the air-drying exothermic effect the alkyd resin waste with a certain thickness would catch fire within one working day.

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Abbreviations

DB:

Amount of double bond in resin (mol kg−1)

V :

Volume (L)

C :

Concentration (mol L−1)

m :

Mass (kg)

ΔH r :

Heat of curing reaction (kJ g−1)

ΔH C :

Heat of combustion (kJ g−1)

δ :

Damkohler number

θ :

Dimensionless temperature

E :

Activation energy (kJ mol−1)

R :

Gas constant

k :

Heat conductivity (Wm−1 K−1)

ρ :

Density (kg m−3)

T :

Temperature (K)

T cr :

Critical ignition temperature (K)

r 0 :

Half thickness (mm)

Q ’’’ :

Exothermic rate (kW m−3)

t c :

Curing time (h)

t ig :

Ignition time (h)

α :

Thermal diffusivity (m2 s)

C p :

Heat capacity (J kg−1 K−1)

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Acknowledgements

This work was supported by [National Natural Science Foundation of China] (Grant Number [51306097, 51906182]) and [Natural Science Foundation of Shandong Province, China] (Grant Number [ZR2019MEE114]).

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Authors and Affiliations

  1. School of Resource and Environmental Engineering, Wuhan University of Science and Technology, 947 Heping Avenue, Qingshan District, Wuhan, 430081, China

    Yong Wang, Jinxiang Zhang, Bo Zhao, Ying Lu, Jie Wang & Xuepeng Jiang

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  1. Yong Wang
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  2. Jinxiang Zhang
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  3. Bo Zhao
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  5. Jie Wang
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Contributions

YW was involved in the conception of the work and the writing and revision of the manuscript. JZ, BZ, and YL were involved in the acquisition and analysis of data. JW and XJ were involved in the interpretation of data.

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Correspondence to Yong Wang.

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Wang, Y., Zhang, J., Zhao, B. et al. Dependence of the air-drying exothermic effect on the double bond in alkyd resins. J Therm Anal Calorim 147, 7785–7791 (2022). https://doi.org/10.1007/s10973-021-11084-8

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