Flameretardant mechanism of flameretardant asphaltbased on thermal analysis(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2019年02期
- Page:
- 47-56
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Flameretardant mechanism of flameretardant asphaltbased on thermal analysis
- Author(s):
- XIONG Jianping1; 2; PENG Wenju3; CHEN Yu4; XU Weian1
- （1. Guangxi Key Lab of Road Structure and Materials, Guangxi Transportation Research & ConsultingCO., LTD., Nanning 530007, Guangxi, China; 2. Postdoctoral Workstation, Guangxi CommunicationsInvestment Group CO., LTD., Nanning 530028， Guangxi, China; 3. CentralSouthern Safety &Environment Technology Institute CO., LTD., Wuhan 430051, Hubei, China； 4. Guangxi Beibu GulfInvestment Group CO., LTD., Nanning 530028, Guangxi, China ）
- Keywords:
- road engineering; flameretardant asphalt; thermal analysis; mechanism
- PACS:
- -
- DOI:
- -
- Abstract:
- To study the flameretardant mechanism of flameretardant asphalt, a base asphalt, single flameretardants, composite flameretardants, flameretardant asphalt, and warmmix flameretardant asphalts which made by the two flameretardants were studied， based on a comprehensive thermal analysis method. The three single flameretardants were considered as follows， decabromodiphenyl ethane (DBDPE), antimonous oxide (Sb2O3), and aluminum hydroxide (ATH). The two composite flameretardants applied were a selfdeveloped DBDPESb2O3 flameretardant and a DBDPESb2O3ATH flameretardant. The flameretardant asphalts were prepared by mixing the base asphalt and flameretardants using a highspeed shearing machine. The warmmix flameretardant asphalt was prepared by adding a Sasobit warmmixed agent to the composite flameretardant asphalt. By comparing and analyzing thermogravimetric （TG）, thermogravimetric derivative（DTG）, differential thermal analysis（DTA）, and other thermal analysis curves of various samples, a flameretardant mechanism that adding a flameretardant and a warmmix agent into the asphalt was presented. The results show that DBDPE is dominated by the gasphase flameretardant mechanism, and the flame retardance in a solid phase also plays a role. Hydrogen bromide（HBr）gas is produced, consuming free pyrolysis radicals from the asphalt and restraining the combustion process of the asphalt. Sb2O3 forms a blanket effect through sublimation heat absorption and steam formation at approximately 600 ℃, which acts as a gas flameretardant. Sb2O3 and DBDPE achieve a good coeffective flameretardant mechanism, and the heat curve slope of the Sb2O3DBDPE flameretardant asphalt decreases significantly compared with the base asphalt. ATH mainly shows a heatabsorbing flameretardant mechanism. The Al2O3 generated by ATH has a condensed phase flameretardant effect and an antismoking effect. The flameretardant effect of ATH under the conditions of a low dosage (less than 8%, mass fraction, the same below) is not clear. However, it can enlarge the flameretardant temperature range of the DBDPESb2O3 composite flameretardant and effectively promote a carbonizing reaction of the asphalt. The initial decomposition temperature of the DBDPESb2O3ATH composite flameretardant asphalt is similar to that of the base asphalt, although the final decomposition temperature increases by approximately 100 ℃ and retains 16.5% of the carbon residue. Therefore, the DBDPESb2O3ATH composite flameretardant shows a good flameretardant effect. Sasobit is able to inhibit the carbonated reaction of the asphalt and has an adverse effect on the flameretardant effect of the DBDPESb2O3ATH flameretardant. 3 tabs, 15 figs, 21 refs.
Last Update: 2019-04-01