Novel mining flame-retardant sealing and filling type grouting material

Abstract

The invention discloses a novel mining flame-retardant sealing and filling type grouting material, and relates to the technical field of borehole sealing. The novel mining flame-retardant sealing and filling type grouting material is prepared by mixing a certain proportion of inorganic salt materials, a certain proportion of cellulose viscous materials and water, does not lose water and is not oxidized in a gel state in a conventional environment, has full elasticity and firm strength in a physical reaction, does not collapse after being cured, and is high in durability. The invention also has the characteristics of easily available raw materials, no toxicity, no corrosion, no pollution and the like, is low in cost, and meets the safety requirements of coal mine use scenes.

Description

Technical Field

[0001] The invention relates to the technical field of drilling hole sealing, in particular to a novel flame retardant sealing grouting material for mining. Background Art

[0002] Sealing is an important technology in drilling for gas extraction in coal mines, and the sealing of the borehole directly affects the extraction effect. Sealing processes include cement mortar sealing, wooden wedge yellow mud sealing, polyurethane foam sealing (GSS sealing bag) and synthetic resin and cement slurry pressure grouting. In the above-mentioned sealing processes, sealing materials are the most important material guarantee for the quality of drilling sealing. At present, the sealing materials widely used in my country are mostly gel-like materials obtained by mixing hydroxypropyl cellulose, hydroxyethyl cellulose, methyl cellulose, hydroxypropyl methyl cellulose, etc. with water in a certain proportion. Since the cellulose raw material is taken from plants, it is easy to deteriorate, precipitate, hydrate, etc., resulting in poor durability of the overall material and failure to achieve the best use effect. In addition, the existing powder materials also have certain problems in terms of uniformity, water retention, and easy generation of bubbles during the dissolution process and gel formation process.

[0003] The patent with publication number CN114854097B discloses an environmentally friendly and degradable gel drilling sealing material for mining and a preparation method thereof, and proposes that the material is prepared by fully stirring and mixing water, modified cellulose ether and additives in a mass ratio of 100:(2-3):(0.5-0.6), wherein the modified cellulose ether is a non-ionic cellulose ether surface-treated with glyoxal, and the additives include a suspending agent, a retarder, an accelerator, a stabilizer, a water retaining agent, an anti-foaming agent and a filler, and the mass percentages of each component to water are: 0.3-0.4%, 0.01-0.02%, 0.01-0.03%, 0.08-0.1%, 0.03-0.05%, 0.04-0.06% and 0-0.1%. Firstly, the additive materials of the modified formula are very complex, and the preparation process is complicated and costly; secondly, the formula attempts to solve the problem that the sealing material retains a large amount of water after the swelling reaction, causing water and glue stratification, and the problem of easy foaming during use. Water retaining agents, anti-foaming agents, fillers and other additives are added. Experiments have found that the effect is not satisfactory. The sealing material made using this formula and process still has water and glue stratification.

[0004] In addition, the materials used in the coal mining field require higher safety, and the existing materials are mostly aniline materials, and the flame retardancy, strength, durability, and corrosion resistance of the materials cannot meet the standards for use in coal mines. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a new type of flame-retardant sealing grouting material for mining. The material is made of inorganic salt materials combined with cellulose viscous materials. It will not lose water or oxidize when stored under normal conditions. It has full elasticity and strong strength under physical reaction and will not collapse after curing.

[0006] 5. To achieve the above purpose, the present invention is implemented through the following technical scheme: the sealing grouting material includes water, masterbatch and auxiliary materials, and the mass ratio is: 100: (2-4): (0.6-0.8); the masterbatch is a mixture of 80-90 parts by weight of hydroxypropyl methylcellulose, 50-60 parts by weight of sodium silicate, 18-25 parts by weight of acrylamide and 1-10 parts by weight of inorganic mineral powder.

[0007] Preferably, the auxiliary material is any one or both of sodium bicarbonate or citric acid.

[0008] Preferably, the hydroxypropyl methylcellulose has a gel point of 20 to 30 minutes, a gel time of 40 to 60 minutes, and a 3% viscosity greater than 600,000 Pa.s.

[0009] Preferably, the inorganic mineral powder is made of water-quenched blast furnace slag, which is processed by drying, grinding, screening and the like, and has a particle size of 60 to 80 meshes.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] (1) The present invention adopts inorganic salt materials combined with cellulose viscous materials and water. The materials have full elasticity under physical reaction. After curing, the materials have strong strength and high durability. The properties will not decline for 2-4 years after curing.

[0012] (2) After solidification, the new material provided by the present invention can effectively insulate and cool down in a high-temperature environment. It does not burn or support combustion at 800°C. After the temperature is lowered, it remains unchanged, does not collapse, and does not lose water.

[0013] (3) The initial gel point of the novel material provided by the present invention is adjustable within 30 minutes, the gel time is less than 60 minutes, and the 3% viscosity exceeds 600,000 mPa.s.

[0014] (4) The novel material provided by the present invention does not require the addition of water-retaining agents and anti-foaming agents. By blending the various components, the water-retaining performance in the gel state can be improved and the amount of bubbles generated during the slurrying process can be reduced.

[0015] (5) The raw materials of the new material provided by the present invention are easy to obtain, non-toxic, non-corrosive, and non-polluting, low-cost, and meet the safety requirements of coal mine usage scenarios. DETAILED DESCRIPTION

[0016] The preferred embodiments of the present invention are described below. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the protection scope of the present invention.

[0017] The present invention provides four technical solutions: a novel flame retardant sealing grouting material for mining, specifically including the following embodiments:

[0018] Example 1

[0019] The sealing and plugging material comprises water, a master batch and an auxiliary material, with a mass ratio of 100:2:0.6; the master batch is a mixture of 80 parts by weight of hydroxypropyl methylcellulose, 50 parts by weight of sodium silicate, 18 parts by weight of acrylamide and 8 parts by weight of inorganic mineral powder; and the auxiliary material is sodium bicarbonate.

[0020] Example 2

[0021] The sealing and plugging material comprises water, a master batch and an auxiliary material, with a mass ratio of 100:4:0.8; the master batch is a mixture of 80 parts by weight of hydroxypropyl methylcellulose, 60 parts by weight of sodium silicate, 25 parts by weight of acrylamide and 8 parts by weight of inorganic mineral powder; and the auxiliary material is citric acid.

[0022] Example 3

[0023] The sealing and plugging material comprises water, a master batch and auxiliary materials, with a mass ratio of 100:3:0.7; the master batch is a mixture of 90 parts by weight of hydroxypropyl methylcellulose, 50 parts by weight of sodium silicate, 18 parts by weight of acrylamide and 5 parts by weight of inorganic mineral powder; the auxiliary materials are sodium bicarbonate and citric acid.

[0024] Example 4

[0025] The sealing and plugging material comprises water, a masterbatch and an auxiliary material, with a mass ratio of 100:2:0.8; the masterbatch is a mixture of 90 parts by weight of hydroxypropyl methylcellulose, 60 parts by weight of sodium silicate, 25 parts by weight of acrylamide and 5 parts by weight of inorganic mineral powder; the auxiliary material is one or both of sodium bicarbonate and citric acid.

[0026] It has been tested that when Examples 1 to 4 are used in construction, their slurries are close to water, have good permeability, and react at low heat when generating gel, without generating high temperature of polymer polymerization reaction, and the final gel is non-toxic, has high strength and elasticity, is not easy to break, has good water retention effect, and has high adaptability. Therefore, it is suitable for large-scale use underground, especially for preventing hidden fire sources of small kilns from invading the main mining working face, realizing oxygen isolation and leak plugging, and is also suitable for filling tunnels, plugging cracks in broken coal and rock masses, and filling caving spaces.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A new type of flame retardant filling grouting material for mining, characterized by: The sealing grouting material comprises water, a masterbatch and auxiliary materials, and the mass ratio is 100:(2-4):(0.6-0.8); the masterbatch is prepared by mixing 80-90 parts by weight of hydroxypropyl methylcellulose, 50-60 parts by weight of sodium silicate, 18-25 parts by weight of acrylamide and 1-10 parts by weight of inorganic mineral powder.

2. The novel flame retardant sealing grouting material for mining according to claim 1 is characterized in that: The auxiliary material is one or both of sodium bicarbonate and citric acid.

3. The novel flame retardant sealing grouting material for mining according to claim 1 is characterized in that: The hydroxypropyl methylcellulose has a gel point of 20 to 30 minutes, a gel time of 40 to 60 minutes, and a 3% viscosity greater than 600,000 Pa.s.

4. The novel flame retardant sealing grouting material for mining according to claim 1 is characterized in that: The inorganic mineral powder is made from water-quenched blast furnace slag, which is processed by drying, grinding, screening and other processes, and has a particle size of 60 to 80 meshes.