改善沥青的低温屈挠性可减轻沥青低温下的发硬，发脆，龟裂，提高公路，卷材的使用寿命。
Hardening, embrittling and cracking at low temperature of bitumen can be reduced due to improved flexing so as to extend the service life of road and rolling material.
采用上述方式处理的模具经过低温时效后延迟了龟裂纹的出现，采用本发明的技术方案使模具的寿命大为延长。
The mold which is treated by adopting the way delays the emergence of craquelure after low-temperature aging, and by adopting the technical scheme, the service life of the mold is greatly prolonged.
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