煤矿用高分子加固材料安全性评价方法研究
发布时间：2018-10-11 11:48
【摘要】：为了快速判断煤矿用高分子加固材料在使用时,是否会由于材料固化反应的放热量过大而引发材料分解乃至灾害,本论文选用四种常用高分子加固材料和实验室自制的聚氨酯类加固材料为实验原料,提出了两步法快速判断加固材料使用安全性的新方法。第一步利用两温度点(加固材料的最高反应温度和热分解温度)比较法测试加固材料的自身使用安全性。首先规范了实验室材料最高放热温度的测试方法；然后利用热分析技术测试了材料的放热量、比热容、理论最高反应温度、热分解温度；最后,通过分析计算得到材料的自身使用安全性。通过研究发现,加固材料最高放热温度值均出现于模具直径d=60mm处。各类加固材料用量达到300g以上时,在实验室条件下最高反应放热温度测试值最大且趋于平衡。加固材料的理论最高反应温度与实际实验测试的最高反应温度(Tmax)有很大的差距,且差距随Tmax变大而增大。加固材料的理论最高反应温度和热分解温度,决定了材料在大量使用时材料是否会分解。在第一步的基础上,通过ANSYS软件模拟加固材料注浆过程并结合注浆模拟实验,研究加固材料周围煤层温度场的变化规律。经研究发现,当加固材料边缘温度保持恒定时,一定时间后煤层的温度也逐渐趋于稳定；当加固材料直径一定时,随着边缘温度升高,煤层的温度增大；同一材料材料在注浆直径为50mm时,煤层边缘温度达到峰值；当加固材料最高反应温度小于120℃时,煤层边缘最高温度低于60℃,小于一般煤的临界自热温度。因此,我们认为芯部小于120℃的材料在注浆时安全的。
[Abstract]:In order to quickly determine whether the polymer reinforcement materials used in coal mines will cause material decomposition or even disaster due to the excessive heat release of the solidification reaction of the materials, In this paper, four kinds of commonly used polymer reinforcement materials and polyurethane reinforcement materials made by the laboratory are selected as experimental materials, and a new method to quickly judge the safety of reinforcement materials by two-step method is put forward. The first step is to compare the two temperature points (the maximum reaction temperature and the thermal decomposition temperature of the strengthened material) to test the safety of the reinforcing material. First, the test method of the maximum exothermic temperature of the laboratory material is standardized; then the exothermic heat, specific heat capacity, theoretical maximum reaction temperature, thermal decomposition temperature of the material are measured by using the thermal analysis technique. The safety of the material is obtained by analyzing and calculating. It is found that the maximum exothermic temperature of the reinforcing material appears at the d=60mm of die diameter. When the amount of various reinforcement materials is more than 300g, the test value of the highest reaction exothermic temperature under laboratory conditions is the largest and tends to be balanced. The theoretical maximum reaction temperature (Tmax) of the reinforced material is significantly different from that of the experimental test (Tmax), and the gap increases with the increase of Tmax. The theoretical maximum reaction temperature and thermal decomposition temperature of the reinforced material determine whether the material will decompose in a large number of applications. On the basis of the first step, through ANSYS software to simulate the grouting process of reinforcement material and combined with grouting simulation experiment, the variation law of temperature field of coal seam around the reinforcement material is studied. It is found that when the edge temperature of the reinforcement material is kept constant, the temperature of the coal bed tends to be stable after a certain time, and when the diameter of the reinforcement material is constant, the temperature of the coal bed increases with the increase of the temperature of the edge. When the grouting diameter of the same material is 50mm, the temperature of coal seam edge reaches the peak value, and when the maximum reaction temperature of reinforcement material is less than 120 鈩，
本文编号：2264076
[Abstract]:In order to quickly determine whether the polymer reinforcement materials used in coal mines will cause material decomposition or even disaster due to the excessive heat release of the solidification reaction of the materials, In this paper, four kinds of commonly used polymer reinforcement materials and polyurethane reinforcement materials made by the laboratory are selected as experimental materials, and a new method to quickly judge the safety of reinforcement materials by two-step method is put forward. The first step is to compare the two temperature points (the maximum reaction temperature and the thermal decomposition temperature of the strengthened material) to test the safety of the reinforcing material. First, the test method of the maximum exothermic temperature of the laboratory material is standardized; then the exothermic heat, specific heat capacity, theoretical maximum reaction temperature, thermal decomposition temperature of the material are measured by using the thermal analysis technique. The safety of the material is obtained by analyzing and calculating. It is found that the maximum exothermic temperature of the reinforcing material appears at the d=60mm of die diameter. When the amount of various reinforcement materials is more than 300g, the test value of the highest reaction exothermic temperature under laboratory conditions is the largest and tends to be balanced. The theoretical maximum reaction temperature (Tmax) of the reinforced material is significantly different from that of the experimental test (Tmax), and the gap increases with the increase of Tmax. The theoretical maximum reaction temperature and thermal decomposition temperature of the reinforced material determine whether the material will decompose in a large number of applications. On the basis of the first step, through ANSYS software to simulate the grouting process of reinforcement material and combined with grouting simulation experiment, the variation law of temperature field of coal seam around the reinforcement material is studied. It is found that when the edge temperature of the reinforcement material is kept constant, the temperature of the coal bed tends to be stable after a certain time, and when the diameter of the reinforcement material is constant, the temperature of the coal bed increases with the increase of the temperature of the edge. When the grouting diameter of the same material is 50mm, the temperature of coal seam edge reaches the peak value, and when the maximum reaction temperature of reinforcement material is less than 120 鈩，
本文编号：2264076
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