Method for evaluating flame retardant for inhibiting asphalt thermal cracking to generate volatile organic compounds

Abstract

The invention relates to a method for evaluating a flame retardant for inhibiting asphalt thermal cracking to generate volatile organic compounds, belongs to the technical field of asphalt material fire safety, and solves the problems that asphalt smoke is difficult to collect by adopting other volatile organic compound analysis methods, and other asphalt flame retardancy evaluation methods cannotspecifically evaluate the volatile organic compound inhibition effect of a flame retardant on asphalt pyrolysis. The method comprises the following steps: weighing asphalt and a flame-retardant modified asphalt sample, putting the weighed asphalt and flame-retardant modified asphalt sample into a tube furnace cracker for cracking, and setting the cracking temperature to be 550 DEG C, the crackerpressure to be 12psi and the cracking time to be 28s; setting programmed heating, starting from 40 DEG C, keeping the temperature for 5 minutes, heating to 270 DEG C at a speed of 5 DEG C / min, and keeping the temperature for 5 minutes; then, guiding pyrolysis fragments into an efficient capillary column to be separated, adopting carrier gas helium, setting the column head pressure to be 7 psi, andthe split ratio to be 25: 1; and finally, obtaining a cracking chromatogram of the thermal cracking volatile organic compound, and obtaining the name and kurtosis value of each substance through contrastive analysis of a mass spectrum library, so as to realize qualitative and quantitative contrastive analysis of the asphalt and the flame-retardant modified asphalt thermal cracking volatile organic compound.

Description

technical field [0001] The invention relates to a method for evaluating flame retardants to inhibit asphalt pyrolysis to produce volatile organic compounds, and belongs to the technical field of fire safety of asphalt materials. Background technique [0002] Asphalt is a complex mixture of polymers widely used in the fields of roads and bridges, building construction and composite material preparation. The main elements contained are carbon and hydrogen, and there are also a small amount of sulfur, nitrogen and oxygen atoms. However, under burning conditions, asphalt materials will release a large amount of heat and toxic fumes, which seriously endanger personal safety. The flammability of asphalt materials is a major safety issue in the application of asphalt in various fields. When a fire breaks out, the temperature rises sharply, and the asphalt materials participate in the combustion to promote the development of the fire, which can lead to heavy casualties and property...

AI Technical Summary

Problems solved by technology

The pyrolysis gas chromatography-mass spectrometry test can rapidly heat the asphalt sample, and can set the pyrolysis temperature, directly collect the volatile pyrolysis products, and obtain the pyrolysis chromatogram of the volatile organic compounds in the pyrolysis of asphalt, which can be qualitatively and quantitatively compared and studied asphalt The relationship between the composition, structure and physical properties of flame-retardant modified asphalt thermal cracking volatile organic substances, so as to solve the problem of collecting asphalt fume with other volatile organic compound analysis methods, and also solve the problem that other asphalt flame-retardant performance evaluation methods cannot specifically evaluate the flame retardancy. Inhibitory effect of fuel on volatile organic compounds produced during asphalt pyrolysis