Method for evaluating flame retardant effect of nano composite flame retardant on pitch

A nano-composite and evaluation method technology, applied in the field of flame-retardant asphalt, to achieve good economic benefits, improve long-term performance, and save operating costs

Inactive Publication Date: 2018-12-11
NANJING FORESTRY UNIV
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Problems solved by technology

[0009] In view of the fact that other commonly used test methods such as oxygen index, horizontal and vertical combustion are difficult to comprehensively and objectively evaluate the flame

Method used

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Embodiment Construction

[0013] The invention provides a method for evaluating the flame retardant effect of a nanocomposite flame retardant on asphalt, and the specific implementation steps are as follows:

[0014] (1) Heating the asphalt to 165°C, adding different dosages of nano-composite flame retardants in a certain proportion to prepare flame-retardant modified asphalt;

[0015] (2) Using asphalt and adding different dosages of nanocomposite flame-retardant modified asphalt, prepare a 10cm×10cm×1cm sample, wrap the bottom surface and surrounding sides of the sample with tin foil, so as not to reduce the loss of sample quality, and press the sample with a steel grid on top of the specimen to avoid warping and expansion of the specimen;

[0016] (3) Lay mineral wool fiber blankets on the bottom of the asphalt and samples with different dosages of nano-composite flame-retardant modified asphalt to simulate the heating conditions and boundary conditions of the asphalt when a fire occurs on the aspha...

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Abstract

The invention discloses a method for evaluating the flame retardant effect of a nano composite flame retardant on pitch, and belongs to the technical field of flame retardance. The method solves the problem that other common testing methods such as oxygen indexes, horizontal and vertical burning cannot comprehensively and objectively evaluate the flame retardant effect of the nano composite flameretardant on pitch. Firstly, the nano composite flame retardant is added according to a certain proportion to prepare pitch and a flame retardant modified pitch cone calorimeter sample; then, the bottom face and the surrounding side faces of the sample are wrapped with tin foils, and the sample is pressed by a steel mesh grid; then the combustion time, the heat releasing rate, the effective combustion heat, the mass loss rate, the fuming amount and the smoke toxicity of pitch and the modified pitch sample in which the nano composite flame retardant at different thermal irradiation powers are tested respectively; and finally, after combustion of the sample is ended, the testing results are analyzed, the influences of the nano composite flame retardant to combustion parameters of the pitch sample are compared, the flame retardant and the smoke inhibition effects of the nano composite flame retardant on pitch are evaluated, and evidences are provided for researching and developing efficient nano composite flame retardants.

Description

technical field [0001] The invention relates to a method for evaluating the flame retardant effect of a nanocomposite flame retardant on asphalt, belonging to the technical field of flame retardant asphalt. Background technique [0002] The flammability of asphalt is a major safety issue faced by asphalt pavement in tunnels. In order to make the asphalt pavement give full play to its own advantages and meet the requirements of the special pavement environment in the tunnel, that is, the requirements of flame retardancy, researchers mainly adopt The method of adding various flame retardants and smoke suppressants to reduce or delay the heat and toxic smoke generated by the asphalt pavement during the tunnel fire process, minimize the thermal decomposition of the asphalt pavement and participate in the combustion, and improve the fire safety of the asphalt pavement in the tunnel. [0003] However, at present, there is no unified standard requirement for the evaluation of aspha...

Claims

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Application Information

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IPC IPC(8): G01N5/04G01N25/00G01N25/20G01N7/16G01N31/12
CPCG01N5/04G01N7/16G01N25/00G01N25/20G01N31/12
Inventor 许涛王斯文张韩帅夏文静
Owner NANJING FORESTRY UNIV
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