钠盐微胶囊制备及其阻化性能研究
Study on preparation and resistance properties of sodium salt microcapsules
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摘要: 微胶囊包裹技术可以保护芯材并使芯材缓慢释放。为提高盐类阻化剂阻化效果，基于微胶囊包裹技术，采用融化分散冷凝法制备出微胶囊阻化剂；优选出常温下吸湿率最低的壁芯比，利用程序升温实验系统对添加不同质量分数阻化剂的不黏煤进行阻化性能测试。结果表明：随着添加微胶囊阻化剂质量分数的增大，煤样耗氧速率和CO释放速率先降低后增加，且在质量分数为15%时阻化效果最优；110 ℃时达到最大阻化率83%，整个温度范围内的平均阻化率为67%；相同质量分数下微胶囊阻化剂的阻化性能优于钠盐阻化剂；微胶囊阻化剂壁材在煤样升温过程中吸收热量，相变熔融后包裹在煤样表面并缓慢释放出芯材，能在煤温较高时保持优良的阻化效果。Abstract: The microencapsulation technology can protect the core material and make the core material release slowly. In order to improve the inhibition effect of salt inhibitor, microcapsule inhibitor was prepared by melting dispersion condensation method based on microencapsulation technology. The wall-core ratio with the lowest moisture absorption at room temperature is selected. The inhibition performance of non-caking coal with different mass fractions of inhibitor was tested by temperature programmed experimental system. The results show that with the increase of the mass fraction of microcapsule inhibitor, the oxygen consumption rate and CO release rate of coal sample decrease at first and then increase, and the inhibition effect is the best when the concentration is 15%. The maximum inhibition rate is 83% at 110 ℃, and the average inhibition rate in the whole temperature range is 67%. At the same concentration, the inhibition performance of microcapsule inhibitor is better than that of sodium salt inhibitor. The microencapsulated inhibitor wall material absorbs heat during the heating process of the coal sample, wraps it on the surface of the coal sample after phase transformation melting and slowly releases the core material, which can maintain an excellent inhibition effect when the coal temperature is high.
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Keywords:
- microcapsule /
- coal spontaneous combustion /
- inhibitor /
- oxygen consumption rate /
- resistance rate
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