Study On Low Temperature Resistance Of Emulsion Explosive With Oil Phase Materials

As we all know,the water-in-oil structure of emulsion explosives is a thermodynamically unstable system,and the overall stability of emulsion explosives is often affected by the temperature of the external environment.For example,the use of conventional emulsion explosives in high-cold areas will cause the phenomenon of rejection of explosion due to poor low temperature resistance of emulsion explosives,which will bring huge safety hazards and property losses to the engineering project.Starting from the oil phase material,the continuous phase of emulsion explosives,it is of great significance to study the influence of oil phase materials on the low temperature resistance of emulsion explosives.This article selects 8 kinds of oil phase materials,the models are PI-3,PA-165,PSW-803,PF=530,PF-1,PT-3,PT-30,PT-40.Through the density,droplet melting point,and nuclear magnetic resonance experimental analysis of the above eight oil phase materials,the physical and chemical properties of the eight oil phase materials are compared.Among them,there are a lot of alkane structures in the material composition of the oil phase materials,including PA-165 and PF-530,PF-1 and PT-40 contain benzene ring structure,and the peak intensity of PT-40 is low.Eight kinds of oil phase materials were prepared into emulsion explosives,and the 8 groups of emulsion explosives were stored frozen at-20℃ for 5d and 15d to observe the physical state,and the emulsification of 5d and 15d was measured by the conductivity meter.The conductivity change of the explosive and the formaldehyde method were used to determine the crystallization rate of emulsion explosives after 15 days of cryopreservation.Comprehensive analysis determined that the emulsion explosives with better low temperature resistance were PF-1 emulsion explosives,PF-530 emulsion explosives,and PA-165.Type emulsion explosives,and use the microscopic observation method and Image J image processing software for the three groups of emulsion explosives to determine the internal microstructure parameters of the emulsion explosive system after 15 days of low-temperature freezing.Thermal decomposition experiments were performed on the latex matrix prepared from the three oil phases,and the Ozawa method,KAS method,and Kissinger method were used to calculate the activation energy of the three groups of emulsion explosives for the experimental results.Finally,the detonation velocity of the three groups of emulsion explosives was measured by the detonation velocity meter to determine the detonation performance of the three groups of emulsion explosives.Based on the above experimental results,the influence of oil phase materials on the low temperature resistance of emulsion explosives is analyzed.The experimental results are as follows:(1)In the cryopreservation experiment,the emulsion explosives prepared from 8 kinds of oil phase materials,except the PT-3 type emulsion explosive,became hard under the condition of low temperature storage at-20℃,the other types of emulsion explosives remained soft;In the rate experiment,the conductivity test value of the PF-1 emulsion explosive is the smallest,indicating that its crystallization is the smallest.It can still ensure a good state after being stored at-20℃ for 15 days,followed by PF-530.In the experiment of determining the crystallization rate by the formaldehyde method,the PF-1 emulsion explosive has the smallest crystallization rate after being stored at-20℃ for 15 days.The comprehensive conductivity experiment can determine that PF-1 oil is in the eight oil phases.Phase-prepared emulsion explosives have the best stability in low-temperature environments.From the molecular structure analysis,the emulsion explosives prepared from oil-phase materials with a three-dimensional structure of benzene ring in the material composition have relatively better stability in low-temperature environments.(2)The activation energy values of the three latex matrices calculated by Ozawa method,KAS method,and Kissinger method,PF-1 type latex matrix are 78.913kJ·mol-1,90.285 kJ·mol-1,82.259 kJ·mol-1,respectively-1;PF-530 type latex matrix is 90.887 kJ·mol-1,107.554 kJ·mol-1,103.297 kJ·mol-1,PA-165 type latex matrix is109.086 kJ·mol-1,132.815 kJ·mol-1,134.101 kJ·mol-1.(3)Comparing the detonation velocity of three emulsion explosives,the average detonation velocity of PF-1 emulsion explosive is 3937.67 m·s-1,the average detonation velocity of PF-530 emulsion explosive is 4027.3 m·s-1,PA-165 emulsion The average detonation velocity of explosives is 4123m-s-1.Figure[18]table[24]reference[90]...