Study on preparation and resistance properties of sodium salt microcapsules

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.

Keywords

• microcapsule
• coal spontaneous combustion
• inhibitor
• oxygen consumption rate
• resistance rate