The Experts below are selected from a list of 2364 Experts worldwide ranked by ideXlab platform

Li Jie - One of the best experts on this subject based on the ideXlab platform.

  • Flame Retardancy of PET Textile Treated by Flame-Retardant Waterborne Polyurethane with Phosphorus-Nitrogen Effects
    Journal of Chemical Engineering of Chinese Universities, 2012
    Co-Authors: Li Jie
    Abstract:

    A flame retardant waterborne polyurethane(PU) was prepared by synthesizing reaction of N,N-bis(2-hydroxymethyl) aminoethyl phosphonic acid dimethyl ester and toluene diisocynate.Then it was smeared on the poly(ethylene terephthalate)(PET) Fabric,and the performance of flame retardant,resistance to launder,and thermo-gravimetric of the PU treated Fabric were investigated.The residue carbon layer after combustion was characterized by scanning electron microscopy(SEM) and energy dispersive spectrometer(EDS) as well.The results show that the LOI value of the PU treated flame-Resistant Fabric is enhanced 5.7% compared with that of the base Fabric,and the vertical combustibility could achieve GB/T5455-1997 B1 level.The cloth surface is clean after combustion and has good resistance to launder.After combustion,Fabric surface forms integrate and smooth carbon layer without holes.The content of P in residue carbon is far more than that in the original flame-Resistant Fabric,and the P enriched in residue carbon has strong ability of flame retardant.The fast thermal decomposition stage of the PU treated Fabric is shortened and the maximum decomposition speed is reduced 32.7% in the TG curve of the PU treated flame-Resistant Fabric.

  • Flame retardancy research of POLY TAFFETA textile containing phosphorus-nitrogen flame-retardant waterborne polyurethane
    Materials Science and Technology, 2011
    Co-Authors: Li Jie
    Abstract:

    To improve flame retardant Fabric,POLY TAFFETA Fabric was treated by flame retardant waterborne polyurethane(PU)with phosphorus-nitrogen synergy effects.The performance of thermal stability and flame retardant of the treated Fabric was investigated by TG,DSC and LOI,and the residue carbon layer was characterized by scanning electron microscopy(SEM)and energy dispersive spectrometer(EDS).The results show that,compared with the base Fabric,the flame-Resistant Fabric reduces starting decomposition temperature and improves the thermal stability under high temperature and decomposition temperature range broadens.The LOI value is increased 5.1%and the vertical combustibility could achieve GB/T5455-1997 B1 level.The Fabric surface is clean after the combustion and forms integrate and smooth carbon layer without holes.The content of P in residue carbon is more than that in flame-Resistant Fabric,which has strong retardant ability of flame.

  • Applied properties of water-based polyurethane containing phosphorus-nitrogen synergetic flame retardancy
    2011
    Co-Authors: Li Jie
    Abstract:

    A flame retardant waterborne polyurethane is prepared using N,N-bis(2-hydroxymethyl) aminoethyl phosphonic aciddimethyl ester and toluene diisocynate, and it is applied to fire proofing of polyester Fabric. The properties of flame retardancy,hydrostatic pressure, color change and tear strength are investigated. The residue carbon layer is characterized by scanning e-lectron microscopy (SEM) and energy dispersive spectrometer (EDS) as well. The results show that when the content offlame retardant mass percentage is 15%, the LOI value of the flame-Resistant Fabric is enhanced 5.1% compared with the baseFabric and the vertical combustibility can achieve GB/T5455—1997 B1 level. After combustion, Fabric surface forms integrateand smooth carbon layer without holes. The content of phosphorus in residue carbon is more than that in flame-Resistant Fabric,and phosphorus is enriched in residue carbon, which has good fire proofing. Along with the increase of the content of flame re-tardant, hydrostatic pressure is increased rapidly. Color change of the Fabric is less than 1.8 and Fabric shows the originalshade.

Jun Li - One of the best experts on this subject based on the ideXlab platform.

  • Modeling the transmitted and stored energy in multilayer protective clothing under low-level radiant exposure
    Applied Thermal Engineering, 2016
    Co-Authors: Yun Su, Jiazhen He, Jun Li
    Abstract:

    Abstract A finite difference model was introduced to simulate the transmitted and stored energy in firefighters' protective clothing exposed to low-level thermal radiation. The model domain consists of a three-layer fire-Resistant Fabric system (outer shell, moisture barrier, and thermal liner), the human skin, and the air gap between clothing and the skin. The model accounted for the relationship between the transmitted heat during the exposure and the discharged heat during the cooling-down period. The numerical model predictions were compared with experimental data. Additionally, the parameters that affect the transmitted and stored energy of protective clothing were investigated. The results demonstrate that for the typical multilayer firefighter protective clothing, the transmitted heat during exposure and the discharged heat after exposure totally determine the skin burn under low-level heat exposure, especially for third-degree skin burns. The findings obtained in this study can be used to engineer Fabric systems that provide better protection for the stored thermal burn.

Donald J Ergstrom - One of the best experts on this subject based on the ideXlab platform.

  • numerical simulation of transient heat transfer in a protective clothing system during a flash fire exposure
    Numerical Heat Transfer Part A-applications, 2010
    Co-Authors: Ahmed Ghazy, Donald J Ergstrom
    Abstract:

    A finite volume model was developed to simulate the transient heat transfer in a protective clothing system. The model domain consists of a fire-Resistant Fabric, the human skin, and the air gap between the Fabric and the skin. The model uses a more sophisticated treatment of the air gap compared to previous models: it accounts for transient combined conduction-radiation heat transfer within the air gap and includes the variation in the air gap properties with temperature. Predictions were obtained for the temperature and heat flux distributions in the Fabric, skin, and air gap as a function of time, as well as the time to receive skin burn injuries. The numerical model was used to explore the physics of heat transfer in protective clothing, which could potentially be used to improve the performance of this clothing. This study illustrates the dependence of the temporal behavior of the heat fluxes on the specific model assumptions, as well as the associated sensitivity of skin burn predictions to these as...

Yun Su - One of the best experts on this subject based on the ideXlab platform.

  • Modeling the transmitted and stored energy in multilayer protective clothing under low-level radiant exposure
    Applied Thermal Engineering, 2016
    Co-Authors: Yun Su, Jiazhen He, Jun Li
    Abstract:

    Abstract A finite difference model was introduced to simulate the transmitted and stored energy in firefighters' protective clothing exposed to low-level thermal radiation. The model domain consists of a three-layer fire-Resistant Fabric system (outer shell, moisture barrier, and thermal liner), the human skin, and the air gap between clothing and the skin. The model accounted for the relationship between the transmitted heat during the exposure and the discharged heat during the cooling-down period. The numerical model predictions were compared with experimental data. Additionally, the parameters that affect the transmitted and stored energy of protective clothing were investigated. The results demonstrate that for the typical multilayer firefighter protective clothing, the transmitted heat during exposure and the discharged heat after exposure totally determine the skin burn under low-level heat exposure, especially for third-degree skin burns. The findings obtained in this study can be used to engineer Fabric systems that provide better protection for the stored thermal burn.

Wen Ren - One of the best experts on this subject based on the ideXlab platform.

  • OPTIMIZATION OF THE FRACTAL-LIKE ARCHITECTURE OF POROUS FIBROUS MATERIALS RELATED TO PERMEABILITY, DIFFUSIVITY AND THERMAL CONDUCTIVITY
    Fractals, 2017
    Co-Authors: Boqi Xiao, Jintu Fan, Wei Wang, Hanxin Chen, Deshun Zhao, Xian Zhang, Wen Ren
    Abstract:

    In this study, the optimization of the fractal-like architecture of porous fibrous materials related to permeability, diffusivity, and thermal conductivity was analyzed by applying the established theoretical models. It was observed that the ratio of dimensionless permeability over dimensionless effective diffusivity decreased with the decrease of porosity and tortuosity fractal dimension, respectively, which implied that lower porosity and tortuosity fractal dimension were beneficial to wind/water Resistant Fabric, as it reduced the ratio of dimensionless permeability over dimensionless effective diffusivity. Besides, it was found that the ratio of the dimensionless total effective thermal conductivity over dimensionless effective diffusivity increased with tortuosity fractal dimension, which implied lower tortuosity fractal dimension was beneficial to clothing insulation, as it reduced the ratio of dimensionless total effective thermal conductivity over dimensionless effective diffusivity. The optimization results indicated that Fabrics with more aligned fibers were preferred for protective clothing, as the low tortuosity fractal dimension implied fibers in the fibrous materials should be more aligned.