Flame Retardant Formulations of Long Glass Fiber Reinforced Polypropylene
Publish Time: 2018-12-17 Origin: Site
Bromine/ antimony flame retardant LGFPP
Beijing Aerospace Kane Chemical Industry and others use Octabromodiphenyl ethane (ODOPE) and Sb2O3, and add expandable graphite (EG) to produce flame retardant LGFPP.
1. Formula
Table 3 Component mass fraction of EG synergistic ODOPE flame-retardant LGFPP (%)
Sample number | PP | GF | ODOPE | Sb2O3 | EG |
1# | 70 | 30 | 0 | 0 | 0 |
2# | 53 | 30 | 14 | 3 | 0 |
3# | 53 | 30 | 13.2 | 2.8 | 1 |
4# | 53 | 30 | 12.4 | 2.6 | 2 |
5# | 53 | 30 | 11.5 | 2.5 | 3 |
6# | 53 | 30 | 10.7 | 2.3 | 4 |
7# | 53 | 30 | 9.9 | 2.1 | 5 |
2. Process
The PP, ODOPE, Sb2O3, EG was added to the high speed mixer in a certain proportion, and then added to the twin-screw extruder (temperature 250 ℃, screw speed 300r/min) for melt compounding; then enters LGF impregnation mould (temperature 260 ℃). The LGF is dispersed, fully impregnated, pulled out by die traction, water-cooled, air-dried, and granulated, finally the flame-retardant LGFPP particle is obtained, then it will be injected into samples.
3. Flame retardant effect
Table 4 LOI and vertical combustion grade of sample 1#~7#
Formula | LOI / % | vertical combustion grade |
1# | 20.0 | |
2# | 23.6 | V-0 |
3# | 23.7 | V-0 |
4# | 24.0 | V-0 |
5# | 24.7 | V-0 |
6# | 23.2 | V-1 |
7# | 22.9 | V-2 |
4. Other performance changes
Table 5 MFR and mechanical properties of sample 1#~7#
Item | Sample number | ||||||
1# | 2# | 3# | 4# | 5# | 6# | 7# | |
MFR / (g·10min-1) | 24.2 | 38.5 | 36.7 | 34.3 | 31.8 | 30.6 | 29.2 |
Tensile strength / MPa | 94.7 | 85.4 | 84.2 | 81.5 | 80.9 | 78.5 | 76.1 |
Bending strength / MPa | 139.2 | 134.3 | 131.4 | 129.9 | 127.8 | 125.3 | 122.5 |
notch impact strength / （KJ·m-2） | 16.8 | 15.2 | 14.9 | 13.2 | 10.5 | 9.4 | 7.7 |