Effect of different humectants on the thermal stability and fire hazard of nitrocellulose

  • Ruichao Wei
  • Yaping He
  • Zheng Zhang
  • Junjiang He
  • Richard Yuen
  • Jian Wang
Article
  • 36 Downloads

Abstract

In order to ensure the thermal safety of nitrocellulose (NC) mixtures in the process of handing, storage, and usage, it is necessary to obtain the thermal stability and fire hazard of NC with different humectants. In this study, the thermogravimetry experiments with four heating rates (5, 10, 15, 20 C min−1) under nitrogen and air atmospheres were performed to investigate the thermal stability of two NC-humectants, namely NC-water and NC-ethanol mixtures, and pure NC. Moreover, the influence of humectants on the fire hazard of NC was evaluated by the ISO 5660 Cone Calorimeter test. The humectant, water or ethanol, can increase the activation energy and reduce the fire risk of NC. Compared with the NC with water, the NC with ethanol exhibits lower activation energy and higher fire hazard.

Keywords

Nitrocellulose Humectant Activation energy Thermal stability Fire hazard 

List of symbols

A

Pre-exponential factor

c

Specific heat/kJ kg−1°C−1

C

The orifice flow meter calibration constant

ab

Constants known as the compensation effect parameters

a1b1

Coefficients in describing critical heat flux

E

Activation energy/kJ mol−1

E0

Energy released per unit mass of O2 consumed/kJ kg−1

f(\( \alpha \))

The dependence of the reaction rate on the extent of conversion

g(\( \alpha \))

The integral form of the reaction model

hc

Convective heat transfer coefficient

k

Thermal conductivity/W m−1°C−1

mv

Evaporation content of humectant

mr

Mass loss range of decomposition of NC samples

\( \dot{m}_{{{\text{O}}_{2} }} \)

Mass flow rate of O2 after the ignition of the material/kg s−1

\( \dot{m}_{{{\text{O}}_{2} }}^{0} \)

Mass flow rates of O2 before the test/kg s−1

\( \Delta \)p

The orifice meter pressure differential

\( \dot{Q} \)

Heat release rate/kW

\( \dot{Q}^{''} \)

Heat release rate intensity measured from the cone calorimeter/kW m−2

\( \dot{q}^{''} \)

Incident radiant heat flux/kW m−2

t

Time

T

Temperature/°C

Te

Absolute temperature of the gas at the orifice meter

Ton

Onset decomposition temperature

Tm

Maximum decomposition temperature

T0

Initial temperature of the sample

R

Gas constant/J mol−1 K−1

w

Mass ratio measured in TG (= W/Wo)

W

Mass of the sample in TG/mg

Wo

Initial sample mass in TG/mg

x

Flashover propensity

Greek letters

\( \alpha \)

Extent of conversion

\( \beta \)

Heating rate

σ

Stefan–Boltzmann constant/W m−2 K−4

ε

Emissivity

ρ

Density/g m−2

Subscripts

av

Average

i

Different heating rates

ig

Ignition

on

Onset

Notes

Acknowledgements

This research was supported by the National Natural Science Foundation of China (No. 51376172) and the grant from the Research Grant Council of the Hong Kong Special Administrative Region, China (Contract Grant Number CityU 11301015).

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  • Ruichao Wei
    • 1
    • 2
  • Yaping He
    • 3
  • Zheng Zhang
    • 1
    • 2
  • Junjiang He
    • 1
    • 2
  • Richard Yuen
    • 2
  • Jian Wang
    • 1
  1. 1.State Key Laboratory of Fire ScienceUniversity of Science and Technology of ChinaHefeiPeople’s Republic of China
  2. 2.Department of Civil and Architectural EngineeringCity University of Hong KongHong KongPeople’s Republic of China
  3. 3.School of Computing, Engineering and MathematicsUniversity of Western SydneySydneyAustralia

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