Delaying foaming-type polymer sealing material for mining

Abstract

The invention discloses a delaying foaming-type polymer sealing material for mining. The sealing material is composed of a component A and a component B, wherein the component A comprises ingredients in parts by mass as follows: 35-55 parts of polytetramethylene ether polyol, 15-25 parts of glycerol, 15-25 parts of castor oil, 5-10 parts of sodium silicate, 0.01-3.0 parts of a delaying catalyst, 1.5-3.0 parts of a foam stabilizer, 1.0-6.0 parts of a foaming agent and 5-20 parts of a flame retardant; the component B comprises the ingredients in parts by mass as follows: 75-90 parts of polymethylene polyphenyl polyisocyanate and 10-25 parts of inorganic particles; and the mass ratio of the component A to the component B is 100 parts to 100-200 parts. The delaying foaming-type polymer sealing material for mining overcomes defects such as over high reaction speed and short sealing length of a traditional material; and compared with an ordinary polyurethane sealing material, the delaying foaming-type polymer sealing material for mining has the advantages that the extraction concentration can be increased by over 23%, the extraction purity is increased by over 15.5%, the gas extraction rate in a mine is increased, the extraction cost is reduced, and the labor intensity of workers is reduced.

Description

technical field [0001] The invention relates to a polymer sealing material for coal mines and a preparation method thereof. Background technique [0002] In recent years, with the increase of coal mining depth, in order to improve the efficiency of gas (coal bed methane) drainage and prevent the occurrence of gas disasters, it is necessary to prolong the gas drainage time, or take effective anti-permeability measures to increase the negative pressure of the drainage system , increase the sealing depth and ensure the sealing quality. Therefore, the sealing depth of drilling is the key. If the sealing depth is too shallow, the sealing length cannot exceed the stress concentration zone of the roadway. Under the action of negative pressure, the drilling can form a loop through the cracks and the external space, causing air to enter the drilling through the cracks. In turn, the concentration of gas drainage is reduced, and the time of drilling gas drainage is shortened, and even...

AI Technical Summary

Problems solved by technology

Currently, rigid polyurethane material is used as the plugging material for gas drainage boreholes, which has the following disadvantages: 1) The high humidity environment in coal mines will affect the reaction time, resulting in increased foaming ratio and fast reaction time, which seriously affects the gas consumption. The quality of drainage drilling sealing; 2) The reaction speed of the existing polyurethane material is too fast, and the material starts to react or even completes the reaction before reaching the sealing position, resulting in insufficient sealing depth

The outside air easily enters the gas drainage borehole through the crack channel of the loose ring around the hole under the action of the negative pressure of drainage, which affects the sealing effect of the borehole; 3) The cost of the existing polyurethane sealing material in the coal mine is high, and the price is 2 About 10,000 yuan / ton