Preparation and characterization of three inorganic toughened phenolic foams for mine leak blocking
The phenolic foam commonly used to prevent spontaneous combustion of coal had the problems of poor toughness and low compressive strength.To improve the poor mechanical properties of phenolic foam,this study prepared three inorganic toughened phenolic foams and then investigated their foaming properties,mechanical properties,and thermal stability.The results showed that the curing time of nano-clay-toughened phenolic foam increased and the curing temperature decreased while the curing temperature of glass fiber and modified glass fiber-toughened phenolic foam changed less.Nano-clay could reduce the foaming multiplier of phenolic foam while glass fiber and modified glass fiber had less effect on the foaming multiplier,and the shrinkage of toughened phenolic foam was reduced.All the three toughening agents could improve the pulverization rate of phenolic foam,among which nano-clay had the best improvement effect.As the amounts of toughening agents were increased,the compressive strength of phenolic foam first increased and then stabilized.The compressive strength of phenolic foam was maximum when the amounts of nano-clay,glass fiber and modified glass fiber were 6%,4%and 4%respectively.The thermal stability of glass fiber and nano-clay toughened phenolic foams increased.
万方数据
维普
