CN112251059A - Cement-based spraying material and preparation method and application thereof - Google Patents
Cement-based spraying material and preparation method and application thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
- C09D1/06—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances cement
- C09D1/08—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances cement with organic additives
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Abstract
The invention relates to a cement-based spraying material and a preparation method and application thereof, wherein the cement-based spraying material comprises 60-80 parts of cement, 20-50 parts of organic monomer, 1-5 parts of cross-linking agent, 1-5 parts of initiator, 1-5 parts of coagulant, 1-3 parts of water reducing agent and 60-100 parts of water; the organic monomer is one or more of acrylamide, acrylic acid, butyl acrylate and ethylene glycol; the cross-linking agent is one or more of N, N-dimethyl bisacrylamide, triethylene diammonium, ethylene glycol dimethacrylate, carbodiimide and azopropanil cross-linking agent. When the cement-based spraying material is used, the powder material and the liquid material are uniformly mixed to obtain the cement-based spraying material, so that the cement-based spraying material is short in hardening time and high in deformation resistance.
Description
Technical Field
The invention relates to the technical field of spraying materials, in particular to a cement-based spraying material and a preparation method and application thereof.
Background
Spontaneous combustion of coal is one of the main natural disasters of mines in China. Along with the gradual increase of coal mining depth, the gas management risk in the mine is higher and higher, and high-efficient administration is more and more difficult. The underground air leakage control is one of the main means for preventing harmful gas from flowing into a production area and preventing spontaneous combustion and fire of a coal bed, and the spraying treatment on the surface of the coal mine tunnel effectively solves the problems of tunnel surface cracking and flammable gas leakage, and is favorable for improving the underground safe production.
At present, although the existing underground cement-based spraying material for the coal mine has a certain supporting function, the existing underground cement-based spraying material has the defects of long solidification time and poor flexibility, the early-stage bearing capacity of the material is poor, a spraying layer is easy to crack under pressure, even the phenomenon of falling off occurs, and great hidden danger is brought to safe production.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a cement-based spraying material and a preparation method and application thereof, and the obtained spraying material has short hardening time and high deformation resistance, and is suitable for the rapid protection of the tunnel surface of underground engineering such as coal mines, tunnels and the like, the support protection of the rock surface, the cracking prevention, air leakage prevention, water leakage prevention and the like of the coal and rock surface.
The invention is realized by the following technical scheme:
the cement-based spraying material comprises, by mass, 60-80 parts of cement, 20-50 parts of organic monomers, 1-5 parts of a cross-linking agent, 1-5 parts of an initiator, 1-5 parts of a coagulant, 1-3 parts of a water reducing agent and 60-100 parts of water;
the organic monomer is one or more of acrylamide, acrylic acid, butyl acrylate and ethylene glycol; the cross-linking agent is one or more of N, N-dimethyl bisacrylamide, triethylene diammonium, ethylene glycol dimethacrylate, carbodiimide and azopropanil cross-linking agent.
Preferably, the water reducing agent is a naphthalene water reducing agent.
Preferably, the initiator is one or more of potassium persulfate, sodium sulfite, cumene hydroperoxide and ammonium persulfate.
Preferably, the coagulant is one or more of calcium chloride, sodium carbonate, sodium chloride, calcium fluoride and calcium fluoroaluminate.
A preparation method of a cement-based spraying material comprises the following steps:
step 1, uniformly mixing 60-80 parts of cement, 1-3 parts of water reducing agent, 1-5 parts of initiator and 1-5 parts of coagulant to obtain powder;
uniformly mixing 20-50 parts of organic monomer, 1-5 parts of cross-linking agent and 60-100 parts of water to obtain a liquid material, wherein the organic monomer is one or more of acrylamide, acrylic acid, butyl acrylate and ethylene glycol; the cross-linking agent is one or more of N, N-dimethyl bisacrylamide, triethylene diammonium, ethylene glycol dimethacrylate, carbodiimide and azopropanil cross-linking agent;
and 2, when in use, uniformly mixing the powder and the liquid to obtain the cement-based spraying material.
Further, the water reducing agent in the step 1 is a naphthalene water reducing agent.
Further, the initiator in the step 1 is one or more of potassium persulfate, sodium sulfite, cumene hydroperoxide and ammonium persulfate.
Further, the coagulant in step 1 is one or more of calcium chloride, sodium carbonate, sodium chloride, calcium fluoride and calcium fluoroaluminate.
A cement-based spray material obtained by the method for producing a cement-based spray material according to any one of the above.
The cement-based spraying material is applied to the underground coal mine, the cement-based spraying material is used for spraying the surface of a roadway in the underground coal mine, the spraying distance is 1-3 m, and the spraying thickness is 2-10 mm.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention relates to a cement-based spraying material, which is prepared by selecting one or more of acrylamide, acrylic acid, butyl acrylate and ethylene glycol as an organic monomer, one or more of N, N-dimethyl-dipropionamide, triethylene-diammonium, ethylene glycol dimethacrylate, carbodiimide and a nitrogen propylene crosslinking agent as a crosslinking agent, simultaneously matching cement, an initiator, a water reducing agent, a coagulant and water, mixing the two at a certain ratio, carrying out polymerization and crosslinking reaction under the action of the initiator under the conditions of room temperature and cement hydration heat, wherein the hydration heat of the cement can promote the polymerization reaction of the organic monomer, the copolymerization reaction of the organic monomer and the crosslinking agent and the crosslinking reaction in a system, and the reactions can lead the organic monomer to become a macromolecular chain polymer and be bonded with partial ions in the cement, providing the final spray material with the required toughness; meanwhile, the reaction heat of organic reaction also promotes the further hardening of the cement, and the hardening time is further shortened under the action of the accelerator.
The invention relates to a method for preparing cement-based spraying material, which comprises the steps of uniformly mixing solid auxiliary materials of an initiator, a water reducing agent and a coagulant with cement to obtain powder, and uniformly mixing an organic monomer, a cross-linking agent and water to obtain liquid material, wherein the solid auxiliary materials of the initiator, the water reducing agent and the coagulant are mixed when the spraying material is used on site, the organic monomer, the cross-linking agent and the water are subjected to polymerization and cross-linking reaction under the action of the initiator under the conditions of room temperature and cement hydration heat, the hydration heat of the cement can promote the polymerization reaction of the organic monomer, the copolymerization reaction of the organic monomer and the cross-linking agent and the cross-linking reaction in a system, and the reactions can enable the organic monomer to become macromolecular chain polymer and be bonded with partial ions in the cement. Meanwhile, the reaction heat of the organic reaction promotes the further hardening of the cement, the hardening time is further shortened under the action of the coagulant, the breaking elongation of the obtained spraying material can reach 38% -53%, the breaking elongation of the pure cement spraying material is extremely low, the flexibility of the spraying material is increased, the deformation resistance of the material is improved, the hardening time and the flexibility of the spraying material can be adjusted according to the use environment and requirements, the application in a complex environment is met, the cement spraying material is a coal mine safety functional material, and the safety production in a coal mine is improved.
Drawings
FIG. 1 is a schematic view of a sample of a spray material obtained in example 1 of the present invention.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The invention relates to a concrete rapid and flexible spraying material for cement-based coal mining, which is prepared from the following raw materials in parts by weight:
60-80 parts of cement, 20-50 parts of organic monomer, 1-5 parts of cross-linking agent, 1-5 parts of initiator, 1-3 parts of naphthalene water reducer, 1-5 parts of coagulant and 60-100 parts of water.
The organic monomer is one or more of acrylamide, acrylic acid, butyl acrylate and ethylene glycol; the cross-linking agent is one or more of N, N-dimethyl bisacrylamide, triethylene diammonium, ethylene glycol dimethacrylate, carbodiimide and azopropanil cross-linking agent; the initiator is one or more of potassium persulfate, sodium sulfite, cumene hydroperoxide and ammonium persulfate; the coagulant is one or more of calcium chloride, sodium carbonate, sodium chloride, calcium fluoride and calcium fluoroaluminate.
Correspondingly, the invention also provides a preparation method of the rapid flexible cement-based mining spraying material, which comprises the following steps:
1) stirring and mixing 60-80 parts of cement, 1-5 parts of initiator, 1-3 parts of naphthalene water reducer and 1-5 parts of coagulant for 10-30 min, wherein the auxiliary materials are solid and are firstly mixed with the cement to obtain a component A or powder A;
2) stirring and mixing 20-50 parts of organic monomer, 1-5 parts of cross-linking agent and 60-100 parts of water for 20-40 min, wherein the organic monomer and the cross-linking agent are both liquid, are soluble in water and do not react in water, and are completely dissolved to obtain a component B or a liquid material B;
when the spraying device is used on site, the component A or the powder material A is poured into a stirring bin of the spraying device, the stirring is started to be performed at a low speed until the stirring is uniform, the component B or the liquid material B is slowly added, the stirring is performed while the component B or the liquid material B is added, the stirring time is 2-3 min, then the surface of a roadway is sprayed under a coal mine, the spraying distance is 1-3 m, the spraying thickness is 2-10 mm, the spraying distance is generally determined according to the underground space and the working pressure of the spraying device, the thickness is determined according to the underground requirement, and different thicknesses have certain influence on the flexibility of the material.
In the fast flexible cement-based mining spraying material, the organic monomer and the cross-linking agent can be subjected to polymerization and cross-linking reaction under the action of the initiator at room temperature and cement hydration heat. The hydration heat of cement can promote the polymerization reaction of organic monomer, the copolymerization reaction of organic monomer and cross-linking agent and the cross-linking reaction in the system, and these reactions can make the organic monomer become macromolecular chain polymer and bond with partial ions in the cement, so as to provide the material with required toughness. Meanwhile, the reaction heat of the organic reaction also promotes the further hardening of the cement, and the hardening time is further shortened under the action of the accelerator.
Example 1
70 parts of cement and 2 parts of cement in a mass ratio of 1: 1 part of potassium persulfate/sodium sulfite, 1 part of naphthalene water reducer and 2 parts of water reducer in a mass ratio of 1: the sodium carbonate/calcium chloride of 1 is poured into a stirrer to be stirred and mixed for 30min to obtain the component A. 30 parts of acrylamide, 2 parts of N, N-dimethyl bisacrylamide and 60 parts of water are stirred and mixed for 40min, and the component B is obtained after complete dissolution. Pouring the component A into a stirring bin of spraying equipment, starting to stir at a low speed, simultaneously adding the component B, stirring while adding, stirring for 2min, and then spraying and ramming, wherein the spraying distance is 1.5m, and the spraying thickness is 3 mm.
Example 2
And pouring 60 parts of cement, 3 parts of ammonium persulfate, 1 part of naphthalene water reducer and 1 part of calcium fluoroaluminate into a stirrer, and stirring and mixing for 30min to obtain a component A. 40 parts of acrylic acid, 4 parts of azopropenin cross-linking agent and 70 parts of water are stirred and mixed for 30min, and the component B is obtained after complete dissolution. Pouring the component A into a stirring bin of spraying equipment, starting to stir at a low speed, simultaneously adding the component B, stirring while adding, stirring for 2min, and then spraying and ramming, wherein the spraying distance is 2m, and the spraying thickness is 2 mm.
Example 3
70 parts of cement and 4 parts of cement in a mass ratio of 1: pouring 1 part of potassium persulfate/sodium sulfite, 2 parts of naphthalene water reducer and 3 parts of sodium carbonate into a stirrer, and stirring and mixing for 20min to obtain a component A. Mixing 40 parts of the following raw materials in parts by mass: 1, 3 parts of N, N-dimethyl bisacrylamide and 70 parts of water are stirred and mixed for 30min, and the component B is obtained after complete dissolution. Pouring the component A into a stirring bin of spraying equipment, starting to stir at a low speed, simultaneously adding the component B, stirring while adding, stirring for 2min, and then spraying and ramming, wherein the spraying distance is 3m, and the spraying thickness is 4 mm.
Example 4
Pouring 80 parts of cement, 5 parts of cumene hydroperoxide, 3 parts of naphthalene water reducing agent and 5 parts of calcium chloride into a stirrer, and stirring and mixing for 10min to obtain a component A. And stirring and mixing 20 parts of butyl acrylate, 1 part of triethylene diammonium and 100 parts of water for 20min, and completely dissolving to obtain the component B. Pouring the component A into a stirring bin of spraying equipment, starting to stir at a low speed, simultaneously adding the component B, stirring while adding, stirring for 3min, and then spraying and ramming, wherein the spraying distance is 1m, and the spraying thickness is 8 mm.
Example 5
65 parts of cement, 1 part of potassium persulfate, 2 parts of naphthalene water reducer and 4 parts of calcium fluoride are poured into a stirrer to be stirred and mixed for 10min, and the component A is obtained. 50 parts of ethylene glycol, 5 parts of ethylene glycol dimethacrylate and 80 parts of water are stirred and mixed for 20min, and the component B is obtained after complete dissolution. Pouring the component A into a stirring bin of spraying equipment, starting to stir at a low speed, simultaneously adding the component B, stirring while adding, stirring for 3min, and then spraying and ramming, wherein the spraying distance is 3m, and the spraying thickness is 10 mm.
Example 6
Pouring 75 parts of cement, 5 parts of ammonium persulfate, 3 parts of naphthalene water reducer and 3 parts of calcium fluoroaluminate into a stirrer, and stirring and mixing for 30min to obtain a component A. 50 parts of butyl acrylate, 2 parts of carbodiimide and 90 parts of water are stirred and mixed for 20min, and the component B is obtained after complete dissolution. Pouring the component A into a stirring bin of spraying equipment, starting to stir at a low speed, simultaneously adding the component B, stirring while adding, stirring for 3min, and then spraying and ramming, wherein the spraying distance is 2m, and the spraying thickness is 6 mm.
The performance of the materials in the above embodiments is tested according to the test standards in the test methods of GBT1346/2011 cement standard consistency water consumption, setting time and stability test method, GB/T17671-1999 cement mortar strength test and GB/T16777-2008 building waterproof paint test method, the performance indexes are listed in Table 1, and as shown in figure 1, the flexibility of the spraying material is increased, and in addition, the hardening time is also shortened.
TABLE 1
| Serial number | Initial setting time/min | Final setting time/h | 28d compressive strength/MPa | Elongation at break/% |
| Example 1 | 17 | 2.5 | 32 | 46 |
| Example 2 | 16 | 2 | 27 | 53 |
| Example 3 | 26 | 3 | 36 | 38 |
| Example 4 | 22 | 3 | 43 | 39 |
| Example 5 | 15 | 2.5 | 27 | 51 |
| Example 6 | 14 | 2 | 30 | 47 |
While the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The cement-based spraying material is characterized by comprising, by mass, 60-80 parts of cement, 20-50 parts of an organic monomer, 1-5 parts of a cross-linking agent, 1-5 parts of an initiator, 1-5 parts of a coagulant, 1-3 parts of a water reducing agent and 60-100 parts of water;
the organic monomer is one or more of acrylamide, acrylic acid, butyl acrylate and ethylene glycol; the cross-linking agent is one or more of N, N-dimethyl bisacrylamide, triethylene diammonium, ethylene glycol dimethacrylate, carbodiimide and azopropanil cross-linking agent.
2. The cement-based spray material as claimed in claim 1, wherein the water reducing agent is a naphthalene water reducing agent.
3. The cement-based gunning material according to claim 1, wherein the initiator is one or more of potassium persulfate, sodium sulfite, cumene hydroperoxide and ammonium persulfate.
4. The cement-based gunning material as claimed in claim 1, wherein the set accelerator is one or more of calcium chloride, sodium carbonate, sodium chloride, calcium fluoride and calcium fluoroaluminate.
5. The preparation method of the cement-based spraying material is characterized by comprising the following steps of:
step 1, uniformly mixing 60-80 parts of cement, 1-3 parts of water reducing agent, 1-5 parts of initiator and 1-5 parts of coagulant to obtain powder;
uniformly mixing 20-50 parts of organic monomer, 1-5 parts of cross-linking agent and 60-100 parts of water to obtain a liquid material, wherein the organic monomer is one or more of acrylamide, acrylic acid, butyl acrylate and ethylene glycol; the cross-linking agent is one or more of N, N-dimethyl bisacrylamide, triethylene diammonium, ethylene glycol dimethacrylate, carbodiimide and azopropanil cross-linking agent;
and 2, when in use, uniformly mixing the powder and the liquid to obtain the cement-based spraying material.
6. The method for preparing a cement-based spraying material according to claim 5, wherein the water reducing agent in step 1 is a naphthalene water reducing agent.
7. The method for preparing a cement-based spray material according to claim 5, wherein the initiator in the step 1 is one or more of potassium persulfate, sodium sulfite, cumene hydroperoxide and ammonium persulfate.
8. The method for preparing a cement-based spray material as claimed in claim 5, wherein the set accelerator in step 1 is one or more of calcium chloride, sodium carbonate, sodium chloride, calcium fluoride and calcium fluoroaluminate.
9. A cement-based spray coating material obtained by the method for producing a cement-based spray coating material according to any one of claims 5 to 8.
10. The application of the cement-based spraying material in a coal mine well according to claim 9, wherein the cement-based spraying material according to claim 9 is sprayed on the surface of a roadway in the coal mine well, the spraying distance is 1-3 m, and the spraying thickness is 2-10 mm.
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| CN115180888A (en) * | 2022-05-31 | 2022-10-14 | 中国矿业大学 | Mine wind-blocking polymer cement mortar material and preparation method and application thereof |
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Application publication date: 20210122 |