试验表明，采用复合催化法很容易制备聚合速度快且软化点适宜的壳法用热塑性酚醛树脂。
The results showed that a kind of fast curing novolac for shell process whose softing point is reasonable was easily prepared by compound catalysis .
试验表明，采用复合催化法很容易制备聚合速度快且软化点适宜的壳法用热塑性酚醛树脂。
The results showed that a kind of fast curing novolac for shell process whose softing point is reasonable was easily prepared by compound catalysis.
采用沥青薄膜加热试验和紫外线老化试验，对沥青的针入度、软化点、延度和粘度等性能指标进行了试验研究。
By thin film oven test and ultraviolet photooxidation test, asphalt performance indices were studied, including penetration, softening point, ductility and viscosity.
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