| The emulsion matrix is a thermodynamically unstable system and its internal phase droplets are made up of supersaturated aqueous solutions of inorganic salts such as ammonium nitrate.During the remote distribution of emulsion matrix,natural storage and transportation vibration are the main factors that affect the stability of the emulsion matrix.For the emulsion matrix with poor quality,the natural vibration of long-term storage and long-distance transportation will cause the instability of the emulsion matrix.Once emulsion matrix becomes unstable,its storage time and explosive performance are reduced which will threat the safety of the blasting project.Therefore,it is very necessary to study the stability mechanism of the emulsion matrix to explore the reasons for the instability of the emulsion matrix caused by natural storage and transportation vibration.The result could help the promotion of remote distribution technology and the development of high stability emulsion matrix.1.Study on particle size of emulsion matrix.The feasibility and instrumental error of measuring average particle size by laser particle size analyzer was verified by systematical experiments.A variety of emulsion matrice were prepared by using laboratory equipments.The effect of shearing speed,emulsifying temperature and dynamic viscosity of oil phase on the average particle size of emulsion matrice was studied.Based on the emulsification theory of general emulsions,the breaking process of internal droplets of emulsion matrix was preliminarily analyzed and the role of surfactants in the emulsification process was thoroughly studied.2.Study on instability mechanism of emulsion matrix suffering natural storageFirstly,the possible instability mechanism of emulsion matrix was analyzed theoretically.The theoretical results were verified by the change of the particle size of emulsion matrix which was tested by laser particle size analyzer.X-ray diffraction and differential scanning calorimetry had been further explored for qualitative and quantitative analysis of emulsion matrix which has been crystallized.The mechanism of natural storage instability of emulsion matrix was analyzed and demonstrated.Finally,four factors including average diameter of internal droplets,surfactant concentration,and dynamic viscosity of oil phase,were used to study its influence on the natural storage stability of emulsion matrix.3.Study on instability mechanism of emulsion matrix suffering natural storageTransportation vibration experiments were performed by using a simulated transportation shaker.Through the change of the particle size of the internal phase droplets and the crystallization behavior during the aging process of the latex matrix,the instability mechanism of the emulsion matrix caused by transportation vibration were analyzed.Finally,the effects of internal phase average particle size,surfactant type,surfactant concentration,and oil phase dynamic viscosity on the vibration stability of emulsion matrix transportation were studied.4.Study on sloshing behavior of emulsion matrixThe sloshing behavior of the emulsion matrix during actual transportation was studied using CFD simulation software.The tested physical properties of the emulsion matrix were used as the basic modeling parameters.And the authenticity and accuracy of the simulation calculation were verified by comparing the result of simulation with real experiments.Then the effects of the acceleration and deceleration,the centripetal motion when turning and the bumpy motion caused by uneven road on the sloshing of the emulsion matrix liquid were studied respectively.Finally,the methods of reducing the sloshing of the emulsion matrix during transportation was studied and comprehensively analyzed. |
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