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Journal
2013 | 11 | 6 | 953-959
Article title

Preparation of low initial expansion temperature expandable graphite and its flame retardancy for LLDPE

Content
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EN
Abstracts
EN
To get expandable graphite (EG) flame retardant for Liner Low-Density Polyethylene (LLDPE) with low initial expansion temperature and high dilatability, the effects of various factors on dilatability were investigated including the dosages of oxidant KMnO4, intercalating reagent H2SO4, assistant intercalating reagent acetic acid (HAc) and reaction temperature. Feasible conditions were obtained according to the results of L9 (34) experiments and single factor experiments. EG with an initial expansion temperature of 160°C and expansion volume of 460 mL g−1 could be prepared according to the mass ratio of material graphite C: KMnO4: 100% H2SO4: HAc = 1.0: 0.4: 5.0: 1.0 (H2SO4 should be diluted to the mass concentration of 75% before the intercalation reaction); the reaction time was 1.0 hour at 25°C. It was found that reaction temperature and H2SO4 dosage were the most important influence factors for dilatability. The limiting oxygen index could be improved to 28.1% by adding 30% of the prepared EG to LLDPE, and the synergistic anti-flame capability of 20% EG with 10% Ammonium polyphosphate (APP) (I) can reach to 33.9%. According to thermal gravimetric and differential thermal analysis results, 70% LLDPE /10% APP (I) /20% EG synergistic anti-flame system shows higher residual carbon and thermal stability. [...]
Publisher

Journal
Year
Volume
11
Issue
6
Pages
953-959
Physical description
Dates
published
1 - 6 - 2013
online
28 - 3 - 2013
Contributors
author
  • College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, People’ Republic of China, pxy833@163.com
author
  • College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, People’ Republic of China
author
  • College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, People’ Republic of China
author
  • College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, People’ Republic of China
References
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.-psjd-doi-10_2478_s11532-013-0227-2
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