PSBR powder bitumen modifier, based on styrene-butadiene rubber grafted with the monomer such as styrene, is a powder styrene butadiene rubber product dedicated to bitumen modification. Compared with SBS modified bitumen, PSBR powder modified bitumen exhibits a stable shell-core structure without the addition of stabilizer, and is especially suitable for being used in north China because of excellent low temperature performance. PSBR powder modified bitumen can improve the high temperature performance of the bitumen as well as bitumen ductility to produce modified bitumen with high viscosity. With good storage stability, PSBR powder modified bitumen, which can be directly used to emulsify and produce emulsified bitumen that is modified, has been adopted by many large coil plants. The high-grade road surface modified bitumen produced by using PSBR powder manifests excellent low-temperature ductility, appropriate high temperature softening point, as well as good mixing and construction performance, and has seen wide application in Tibet, Qinghai Province, Gansu Province, Shanxi Province, Shanxi Province, and the northeastern China.
Technical Index
Index Model | GS-1 | 1502 | 1588 |
Appearance | White Powder | White Powder | White Powder |
Particle Size (Mesh) | ＜20 | ＜40 | ＜60 |
Moisture Mass Fraction, % | ≤2 | ≤2 | ≤2 |
Molecular Weight | 250,000 -300,000 | 200,000 -300,000 | 200,000 -300,000 |
Tensile Strength, MPa | 20 | 21 | 27 |
Elongation at Break, % | 300 | 320 | 380 |
Bound Styrene Mass Fraction, % | 22.5-24.5 | 22.5-24.5 | 22.5-24.5 |
Dried Rubber Content, % | ≥55 | ≥75 | ≥99 |
Raw Rubber Mooney Viscosity, ML+4 | 50-70 | 38-68 | 65-70 |
Stress at 300% Elongation, MPa | 10-15 | 10-15 | 15-25 |
