Study on the influencing factors of reaction temperature and foaming ratio of phenolic resin foam filling material
The rapid foaming performance and high foaming ratio of phenolic resin foam can help it fill the large cavity of coal mine caving area in a very short time with a certain supporting ability.Foaming agent and additives agent are the main factors affecting phenolic resin foam.Physical foaming agent and chemical foaming agent were compared from foaming factor,maximum reaction temperature,compressive strength,curing time,bubble structure and other indicators.The results show that the effect of chemical foaming agent is better than physical foaming agent with same amount,while better foaming effect can be obtained when the two are mixed.With the addition of foaming agent,the foaming factor of phenolic resin foam increases,and when the foaming factor exceeds 40 times,its compressive strength will be lower than the standard index requirements,and it is the best when the foaming ratio is 25-40 times.The addition of additives with high calorific value can effectively reduce the maximum reaction temperature,however,excessive addition will prolong the curing time of phenolic resin foam,resulting in slow molding,affecting the construction effect.Therefore,when the amount of additives added is between 10％and 15％,it can effectively reduce the maximum reaction temperature and have little effect on the curing time.
万方数据
维普
