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Thermosensitive microencapsulation retarder for preventing and controlling spontaneous combustion of coal and preparing method of retarder

A microencapsulation, temperature-sensitive technology, applied in microcapsule preparations, microsphere preparation, chemical instruments and methods, etc., can solve the problems of low resistance efficiency, poor thermal stability and safety, and short resistance life, etc. Achieve the effect of enhancing stability, increasing activation energy and low cost

Active Publication Date: 2018-11-02
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the nature of this type of inhibitor, it often has problems such as poor moisture resistance, thermal stability and safety, resulting in low inhibitory efficiency and short inhibitory life.

Method used

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  • Thermosensitive microencapsulation retarder for preventing and controlling spontaneous combustion of coal and preparing method of retarder
  • Thermosensitive microencapsulation retarder for preventing and controlling spontaneous combustion of coal and preparing method of retarder
  • Thermosensitive microencapsulation retarder for preventing and controlling spontaneous combustion of coal and preparing method of retarder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The core material of the microcapsules in this example uses catechin with strong reducibility and certain thermal stability combined with a small amount of ascorbic acid and anthocyanin. The chemical structure of catechin itself can effectively capture and eliminate The key groups lipoxygen free radicals, ascorbic acid and anthocyanins can well reduce the oxidative damage of catechins in the process of preparation, storage and transportation, and improve the stability of catechins. The combination of the three has a synergistic effect. Effectiveness; PEG-2000 and PEG-1500 are selected as the wall material of microcapsules, both of which are solid at room temperature. The melting point of PEG-2000 is about 51°C, and the melting point of PEG-1500 is about 46°C. It has good thermal stability and high ignition point. . The PEG material itself is easy to absorb water. After spraying on the surface of the coal body, it can keep the surface of the coal body moist. When the tem...

Embodiment 2

[0048] The microcapsule core material selected in this embodiment is 25.5g of catechin, 1.5g of ascorbic acid, and 3g of anthocyanin; the selected microcapsule wall material is 25g of PEG-8000, and its melting point is about 60°C; 5g of PEG-6000, its The melting point is around 57°C. Other preparation conditions and preparation steps are identical with embodiment 1. The mass ratio of the prepared microcapsule inhibitor core material and wall material reached 1:1, that is, the core material accounted for 50% of the mass, and when the temperature was higher than 59°C, the wall material became molten and released the core material.

[0049] The performance test is carried out to the microcapsule inhibitor that present embodiment makes, and the results are as follows:

[0050] (1) Water resistance test

[0051] Since the physical hydrophobicity of the material is the same as that of Example 1, the results of the water barrier test are the same, and the prepared microcapsules hav...

Embodiment 3

[0059] The core material of microcapsules selected in this example is 45g of catechin, 3g of ascorbic acid, and 3g of anthocyanin; the wall material of microcapsules selected is 3g of PEG-8000, whose melting point is about 60°C; 6g of PEG-10000, whose melting point is 61 ℃ or so. Other preparation conditions and preparation steps are identical with embodiment 1. The mass ratio of the core material to the wall material of the prepared microcapsule inhibitor reaches 17:3, that is, the core material accounts for 85% of the mass. When the temperature is higher than 61°C, the wall material becomes molten and releases the core material.

[0060] The microcapsules that present embodiment makes carry out performance test, and result is as follows:

[0061] (1) Water resistance test

[0062] Since the physical hydrophobicity of the material is the same as that of Example 1 and Example 2, the results of the water barrier test are the same, and the prepared microcapsules have very good...

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Abstract

The invention discloses a thermosensitive microencapsulation retarder for preventing and controlling spontaneous combustion of coal and a preparing method of the retarder. The retarder comprises corematerials and a wall material coating the core materials; the core materials are prepared from, by weight, 85-90% of catechin, 5-8% of ascorbic acid and 2-10% of anthocyanin, and the wall material ispolyethylene glycol. The preparing method comprises the steps of firstly, heating the wall material to be molten, grinding the core materials into fine powder, then adding the core materials into thewall material in the molten state in batch until the mass ratio of the wall material to the core materials reaches the standard, then adding a thickener and a cross-linking agent, after the materialsare fully mixed, slowly cooling a mixed system until a solid product is obtained, and finally, crushing and sieving the solid product to obtain the thermosensitive microencapsulation retarder. The retarder is rich in source of preparation raw materials, environmentally friendly, simple in preparing technology, low in cost, good in thermal stability, low in water-absorbing property and convenient to store, the retarding efficiency is improved, the retarding time is shortened, and the retarder helps to achieve efficient prevention and control of the spontaneous combustion of the coal.

Description

technical field [0001] The invention belongs to the field of spontaneous combustion and chemical retardation for fire prevention and extinguishing in coal mines, and relates to a chemical inhibitor, in particular to a temperature-sensitive microencapsulated chemical inhibitor material for preventing coal spontaneous combustion and a preparation method thereof. Background technique [0002] Coal spontaneous combustion is one of the main natural disasters that threaten the safety of coal mining. According to statistics, about 80% of the coal seams that have been mined in my country have a high propensity for spontaneous combustion; mines that exploit thick coal seams basically have the problem of coal spontaneous combustion, and on average, more than 100 working faces are closed each year, resulting in major economic losses and safety. Hidden danger. In addition to destroying coal resources, the toxic and harmful gases produced by coal spontaneous combustion pose a serious thr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F5/08C09K15/08B01J13/04
CPCB01J13/046C09K15/08E21F5/08
Inventor 戚绪尧焦庚新白子明黄敬姬有仓辛海会白成武宋润权
Owner CHINA UNIV OF MINING & TECH
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