SU883240A1 - Consolidating composition, particularly, for salt-bearing rock - Google Patents

Description

I

The invention relates to a composition g for fixing a soil containing water-soluble salts for the purpose of arranging waterproof curtains, plugging tweezers and cavities in the walls of wells.

The known composition is l for storing the ground, comprising, in wt%: Urea resin 40-60. Oxalic acid 4-8 Hexamethylene tetramine 0.1-0.5 Water Else

The closest to the proposed technical essence and the achieved effect is the composition 2 for fixing the soil mainly in salt mines on the basis of a saturated solution; salt and synthetic agent with an initiator and a polymerization accelerator, in which, to improve the waterproofing properties of the soil, the components are introduced into the composition in parts by weight:

Saturated solution

salts.125-130

Synthetic

8-30,

containing a mixture of vinyl monometers in the following ratio, wt.%:

70-90

Acrylamide Salt

ten

5-20 acids up to 3

Calcium hydroxide 2-7 Polyacrylamide Polymerization initiator ammonium persulfate,% from-0.1-1.1%

15 . weight synthetic

Polymerization Accelerator - sodium hydrosulfate,% of H), 1-1.4% of Essa synthetic resin

20 The disadvantages of the known formulations are the low waterproofing properties of the fixed rock and the high consumption of the composition. 3 The purpose of the invention is to increase the hydr. Insulating properties of the fixed rock and reduce the consumption of the composition,. This goal is achieved by the fact that the composition for fixing predominantly salt-bearing rocks, including a saturated aqueous solution of salts included in the rock, or 14 mineralized water, acrylamide and / or methacrylamide, acrylates, initiator and accelerator of polymerization, additionally contains peraform or formaldehyde, calcium chloride or magnesium chloride, non-ionic high-molecular-weight water-soluble compounds and a pH regulator in the following ratio of components, parts by weight: A saturated aqueous solution of salts or mineralized water 70-90 Acrylamide and / or methacrylamide 10-30 Acrylates 0.4-6.0 Polymerization initiator0, 01-0.25 Polymerization accelerator0, 001-0.015 Paraform or formadehyde0, 3-3.0 Calcium chloride or magnesium chloride 0, 1- 1.0 Non-ionic high-molecular-weight water-soluble compounds 0, 2-1.4 pH regulator, which ensures that the composition contains polyvinyl alcohol or poly-ethylene oxide as non-ionic high-molecular water-soluble compounds, at least one component from the group: acrylic acid, methacrylic acid, with acrylic acid salt, methacrylic acid salt. In addition, when acrylic or methacrylic acid is used as acrylate as a regulator, the composition contains alkali. The use in the proposed compound of non-deficient eonyl monomers should expand the range of application of the composition and increase its hydroinsulation properties. 0 The addition of paraformaldehyde or formaldehyde to the soil fixation composition results in their reaction with the amide methyl derivatives, which then condense in the acidic medium during the polymerization of the monomers to form a water-insoluble spatial polymer. The use of a non-ionic high-molecular compound leads to an increase in the viscosity of the solutions, as a result of which the consumption of reagents is reduced when the solution is pumped into the soil. In addition, high molecular weight additives interact with the soil and polyacrylates to form hydrogen and the like. connection, resulting in increased adhesion of the composition to the ground. Replacing polyacrylamide with non-ionic high-molecular compounds promotes an increase in the molecular weight of the resulting polymer, since, unlike polyacrylamide, they do not cause chain breakage due to radial polymerization of acrylic monomers. The addition of highly soluble calcium or magnesium chloride instead of practically insoluble calcium hydroxide makes it possible to create additional bonds in the system using bivalent ions. The addition of an acid to the composition allows the pH of the solution to be adjusted to 4-6, which, in turn, allows you to adjust the polycondensation rate of methyl derivatives and the duration of polymerization of vinyl monomers. When used as acrylates of acrylic or methacrylic acids, alkali is used to adjust the pH of the polymerized solution, for example) NaOH, while the medium remains acidic in the pH range 4-6. Due to the possible formation of buffer solutions when introducing the components of the composition into different types of brines, it is impossible to indicate the quantitative consumption of the acid included in the composition for fixing the soil; therefore, acidity is controlled by the pH of the liquid phase and adjusted by introducing acid into the composition. polymerization. Use as acrylates in addition to salts of acrylic acid, acrylic and methacrylic acids, and

Also, mixtures of these acids with their salts allows one to more accurately control the rate of polycondensation and increase the adhesion of the composition to gruite.

The composition for fixing the soil containing salts is prepared as follows.

Acrylamide or methacrylamide is added to the salt solution obtained by dissolving the salts in the soil or brine directly from the soil. After the vinyl monomers are dissolved in the mineral salt solution, paraform or an aqueous formaldehyde solution is added to it (recalculated). 100% H-COH), the pI value of the solution is adjusted to 4-6 by adding an acidity regulator, for example, sulfuric, hydrochloric or acetic acid, or, if used as an acrylate or methacrylic acid, alkali, for example or NaOH or. An aqueous solution of a high-molecular compound polyvinyl alcohol or is then added. polyethylene oxide and calcium chloride or chlorine Tbtfj magnesium. After thoroughly mixing all the components, the polymerization initiator — ammonium persulfate and the polymerization accelerator — sodium hydrosulfate are introduced into the solution. The solution thus obtained is injected into the soil in which the polymerization of the monomers and the polycondensation of the polymers take place, as a result of which a durable, water-resistant compound, the polymer-primer, is formed.

Example 1. A known composition of a soil curing compound is prepared on the basis of a saturated aqueous solution of potassium and sodium chlorides and a peroxide with an initiator and a polymerization accelerator. This composition in the amount of 0.1 m is pumped into the soil represented by sylvinite, clays, silicates and carbonates. After 30 days, the bridge from the soil fixed with this composition turned out to be destroyed, and the soil brines began to flow into the mine workings.

Example 2. To 80 weight.h. brine containing 23.3% sodium chloride and 10% potassium chloride, obtained by dissolving sylvinites in water, is added with stirring 18 parts by weight of crystalline acrylamide; 2 parts by weight of acrylic acid 1.2 parts by weight paraform: 0 ,.

832406

in magnesium chloride {1.4 parts by weight of polyvinyl alcohol, the pH of the solution is adjusted to 5 by the addition of potassium hydroxide. The mass of 5 thus obtained is stirred for 30 minutes until all components are completely dissolved. Then, while the mixer is running, 0.04 parts by weight of ammonium persulfate and 0.006 parts by weight of sodium thiosulfate are added. Solution for 10 min

mixed and pumped into the soil, represented by sylvinite, silicates, carbonates. At the same time, the consumption of the composition was reduced by 15%, 15 and the tightness of the bridges of fixed soil was not broken even after 8 months.

Example 3. To 90 weight.h. saline water containing the following cations and anions, mg / l: Na or K 440.0; NH 0.2; , 2; , 2; , 01; SGBZZ, and S0p06.6, add 30 parts by weight. methacrylamide, 25 6 weight.h. acrylic acid, I weight.h. polyethylene oxide, 1 weight.h. calcium chloride, 3 weight.h. (in terms of 100% P-SON) aqueous formformate. The resulting solution has a 3Q pH of 4.1. The solution is thoroughly mixed and 0.225 parts by weight is added. ammonium persulfate. Then, the prepared mass is pumped into the fixed space of the trunk below the zone of the flow of saline water. At the same time, the water quenching in the lower horizons ceased and reliable hydro insolation of the trunk was achieved.

.P m ime 4. To 7P weight.h. 10.3 parts by weight of sodium chloride and 10% potassium chloride, 10 parts by weight, are added with stirring. acrylamide; 0.4 parts by weight acrylic acid; 0.3 weight.h. paraform; 0.2 weight.h.

45 polyvinyl alcohol 0.1 weight.h. calcium chloride, the pH of the resulting composition of 4.6. This mixture is thoroughly mixed for 20 minutes, then with the stirrer added

Claims (2)

50 0.05 weight.h. ammonium persulfate and 0.015 weight.h. sodium thiosulfate. Such a composition is pumped into the sylvinite reservoir, from which groundwater is displaced by pre-compressed air. After polymerization and polycondensation, the composition was solid. waterproof system that does not pass. ground water. 7883240 Thus, the proposed composition makes it possible to fix the rocks containing chloride-type ores — sylvin, sylvinite, halite, and also mineralized water. 5 The claims of J. Composition for fixing predominantly saline rocks, including a saturated water solution of salts included in the rock, or saline water, acrylamide and / or methacrylamide, acrylates, initiator and polymerization accelerator, characterized in that, in order to increase hydroisol The national quality of the fixed rock and the reduction of the composition pd, it additionally contains paraforms or formaldehyde, calcium chloride or magnesium chloride, non-anthropogenic macromolecules pbNo; ib) compound bromide and pH regulator at the next component ratio, parts by weight: Saturated water solution of salts or saline water 70-90 Acrylamide and / or methacrylamide 10-30 Acrylates0.4-0.6 Polymerization initiator0, 01-0.25 Polymerization accelerator 0.001-0.015 ni in the course of the year Para or formaldehyde 0, 3–3.0 Calcium chloride or magnesium chloride 0.1–1.0 Non-ionogenic high-molecular water-soluble compounds 0.2–1.4 pH regulator providing pH 4-6 2 The composition of POP.1 is different in that it contains polyvigric alcohol or polyethylene oxide as non-ionic high-molecular water-soluble compounds. 3. Composition on. Claims 1 and 2, casting by the fact that, as quality acrylates, it contains at least one component from the group: acrylic slots, methacrylic acid, rilic acid salt, salt of methacrylic slots, 4. The composition according to claims 1-3, characterized in that when used as acrylates of acrylic and methacrylic acid, it contains alkali as a pH regulator. Sources of information that are considered in the examination 1. Authors certificate of the USSR 534547, cl. E 02 D 3/12, 1974. 2. Authors certificate USSR 395543, cl. E 02 D 3/12, 1971.