Multi-effect stabilizer as well as preparation method and application thereof

Abstract

The invention relates to the technical field of cement paste auxiliaries, and provides a multi-effect stabilizer as well as a preparation method and application thereof. The multi-effect stabilizer provided by the invention is prepared from the following components in percentage by mass: 5 to 20 percent of polymer emulsion, 1 to 10 percent of nano silicon dioxide, 1 to 10 percent of cellulose ether, 0.5 to 5 percent of organosilane and the balance of water. The multi-effect stabilizer provided by the invention can significantly improve the stability and fluidity of the double-liquid cement paste, prolong the retarding time, improve the impermeability and acid corrosion resistance, and improve the durability. Results of the embodiment show that after the multi-effect stabilizer is added, the retarding time of the cement paste can reach 200h, and the weight loss of an obtained test piece is very small after the test piece is soaked in a sulfuric acid solution and clear water. In conclusion, the multi-effect stabilizer disclosed by the invention has important application value in the field of shield construction, can adapt to complex construction environments needing long-time delayed coagulation, and is suitable for environments with relatively high underground water level or relatively strong water acidity.

Description

Technical Field

[0001] The invention relates to the technical field of cement slurry additives, and in particular to a multi-effect stabilizer and a preparation method and application thereof. Background Art

[0002] Double liquid cement slurry is a special grouting material composed of cement and water glass as the main components. This slurry can solidify in a short time to form a structure with a certain strength. The use of this mixed slurry can achieve the purpose of rapid plugging and has a wide range of applications in engineering.

[0003] In shield tunnel construction, two-liquid cement slurry is a key construction material, and its stability and performance are crucial to the stability of tunnel engineering. However, the two-liquid cement slurry in the prior art has some shortcomings in terms of stability and construction effect. For example, traditional two-liquid cement slurry has problems in retarding time, impermeability and durability, which may lead to safety and quality problems such as stratum settlement and water seepage. In particular, after the cement slurry components of the two-liquid cement slurry are prepared, they need to be mixed with sodium silicate solution on site. If the retarding time of the cement slurry is not long enough, it is easy for the cement slurry components to solidify separately before being mixed with the sodium silicate solution.

[0004] Chinese patent CN105712648A discloses a highly efficient retarding water-reducing agent for concrete, which includes water-reducing agent, retarder and shrinkage-reducing agent. Through a specific component ratio, cement particles are dispersed, the workability of concrete is improved, and the durability of concrete is increased. However, the patent does not mention the anti-seepage effect and its direct correlation with shield double-liquid cement slurry.

[0005] Chinese patent CN117430371A discloses a sulphoaluminate cement retarder, whose components include tartaric acid, nano-silicon dioxide, polycarboxylic acid water reducer, pH regulator, sodium gluconate, dispersant, ferric nitrate, stabilizer and water. The retarder can make sulphoaluminate cement maintain a good retarding effect under high temperature conditions, and can make the cement more dense and improve the mechanical strength. However, the patent also does not mention the anti-seepage effect or the direct correlation with the shield double-liquid cement slurry.

[0006] In summary, there is an urgent need to provide a multi-effect stabilizer suitable for two-liquid cement slurry, which has a good retarding effect and can improve the anti-seepage performance and durability. Summary of the invention

[0007] In view of this, the present invention provides a multi-effect stabilizer and a preparation method and application thereof. The multi-effect stabilizer provided by the present invention can prolong the retarding time of the cement slurry components in the two-liquid cement slurry, improve the anti-permeability and acid corrosion resistance of the two-liquid cement slurry, thereby improving its durability, and can significantly improve the stability and fluidity of the two-liquid cement slurry.

[0008] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0009] A multi-effect stabilizer comprises the following components in mass fraction: 5% to 20% polymer emulsion, 1% to 10% nano silicon dioxide, 1% to 10% cellulose ether, 0.5% to 5% organic silane, and the balance is water; the solid content of the polymer emulsion is more than 30%.

[0010] Preferably, the polymer emulsion is one or more of polyvinyl alcohol emulsion, polyacrylate emulsion and polyacrylamide emulsion.

[0011] Preferably, the average particle size of the nano-silicon dioxide is less than 50 nm; and the organosilane includes one or more of γ-aminopropyltriethoxysilane, propyltrimethoxysilane and methyltrimethoxysilane.

[0012] Preferably, the multi-effect stabilizer further comprises, by mass fraction: 0.5% to 5% of a phosphate dispersant and 0.5% to 5% of an organic amine retarder.

[0013] Preferably, the phosphate dispersant includes one or more of bisphenol A phosphate, oleamide phosphate betaine and nonylphenol polyether phosphate;

[0014] The organic amine retarder includes one or both of ethylenediaminetetramethylenephosphonic acid and diethylenetriaminepentamethylenephosphonic acid.

[0015] The present invention also provides a method for preparing the multi-effect stabilizer described in the above scheme, comprising the following steps:

[0016] The polymer emulsion, nano silicon dioxide, cellulose ether, organic silane and water are mixed to obtain the multi-effect stabilizer.

[0017] Preferably, the mixing includes: a first stirring of the polymer emulsion, then adding nano-silica, cellulose ether and organosilane for a second stirring, then adding water, and a third stirring of the resulting mixture to obtain the multi-effect stabilizer; the first stirring speed is 1000 to 2000 rpm, and the stirring time is 3 to 5 min; the second stirring speed is 800 to 1500 rpm, and the stirring time is 3 to 5 min; the third stirring speed is 1500 to 2500 rpm, and the stirring time is 10 to 15 min.

[0018] Preferably, when the multi-effect stabilizer also includes a phosphate dispersant and an organic amine retarder, before adding water, the phosphate dispersant and the organic amine retarder are also added and stirred at a low speed, and the rotation speed of the low-speed stirring is 500 to 1000 rpm, and the stirring time is 2 to 4 minutes.

[0019] The present invention also provides the use of the multi-effect stabilizer described in the above scheme or the multi-effect stabilizer prepared by the preparation method described in the above scheme in shield double-liquid cement slurry.

[0020] The present invention also provides a two-liquid cement slurry, comprising the multi-effect stabilizer described in the above scheme or the multi-effect stabilizer prepared by the preparation method described in the above scheme.

[0021] The invention provides a multi-effect stabilizer, comprising the following components in mass fraction: 5% to 20% of polymer emulsion, 1% to 10% of nano silicon dioxide, 1% to 10% of cellulose ether, 0.5% to 5% of organic silane, and the balance is water; the solid content of the polymer emulsion is more than 30%. The invention obtains the multi-effect stabilizer of the invention by strictly controlling the components and proportions of the multi-effect stabilizer, wherein the polymer emulsion can provide dispersibility and stability, improve the performance of the cement slurry, keep the cement slurry uniform and fluid during storage and construction, thereby improving the overall workability and long-term durability of the cement-based material; the nano-silicon dioxide can fill the tiny pores in the cement matrix, thereby increasing the density of the matrix, and the nano-silicon dioxide reacts chemically with the cement hydration product to generate more calcium silicate hydrate (CSH) gel, which is a major hydration product and contributes greatly to the strength; therefore, the addition of the nano-silicon dioxide can significantly improve the compressive strength and flexural strength of the cement-based material; the cellulose ether can improve the anti-seepage performance of the two-liquid two-liquid cement slurry, and the organosilane can improve the durability of the two-liquid cement slurry; further, the multi-effect stabilizer of the invention also includes a phosphate dispersant and an organic retarder, and the addition of the phosphate dispersant and the organic amine retarder can further improve the stability and construction performance of the two-liquid cement slurry.

[0022] In summary, the multi-effect stabilizer provided by the present invention can significantly improve the stability and fluidity of the two-liquid cement slurry, prolong the retarding time of the cement slurry components, and improve the anti-permeability and acid corrosion resistance of the two-liquid cement slurry, thereby improving its durability. The results of the embodiments show that the two-liquid cement slurry with the addition of the multi-effect stabilizer of the present invention has good stability and fluidity, and the retarding time of the cement slurry components can reach 200h, which is beneficial to construction operation and control. This retarding property makes the present invention have important application value in the field of shield construction, especially when long-term retarding is required to adapt to complex construction environments; at the same time, the two-liquid cement slurry with the addition of the multi-effect stabilizer of the present invention has good anti-permeability and resistance to groundwater acid corrosion, which can effectively prevent groundwater infiltration, and is particularly suitable for environments with high groundwater levels or strong acidic water quality; the multi-effect stabilizer provided by the present invention is suitable for various shield construction environments and has broad application prospects.

[0023] The present invention also provides a method for preparing the multi-effect stabilizer of the above scheme. The preparation method provided by the present invention is simple to operate and easy to realize industrial production. Furthermore, the present invention accurately controls the order of adding raw materials and the stirring speed and time, further ensuring the performance of the multi-effect stabilizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the raw material ratio of the multi-effect stabilizer of the present invention;

[0025] Figure 2 The present invention is a schematic diagram of the process of preparing the multi-effect stabilizer. DETAILED DESCRIPTION

[0026] The invention provides a multi-effect stabilizer, comprising the following components in mass fraction: 5% to 20% of polymer emulsion, 1% to 10% of nano silicon dioxide, 1% to 10% of cellulose ether, 0.5% to 5% of organic silane, and the balance is water; the solid content of the polymer emulsion is more than 30%.

[0027] Unless otherwise specified, all raw materials / components used in the present invention are commercially available.

[0028] Figure 1 The schematic diagram of the raw material ratio of the multi-effect stabilizer of the present invention is shown below. Figure 1 Provide detailed explanation.

[0029] In terms of mass fraction, the multi-effect stabilizer provided by the present invention comprises 5% to 20% of the polymer emulsion, specifically 5%, 8%, 10%, 12%, 15% or 20%; the solid content of the polymer emulsion is preferably above 30%, specifically 30%, 40% or 50%; the polymer emulsion is preferably one or more of polyvinyl alcohol (PVA) emulsion, polyacrylic acid salt emulsion and polyacrylamide emulsion; the polyacrylamide emulsion can specifically be cationic, anionic, nonionic or zwitterionic; the present invention has no special requirements on the types of the polyvinyl alcohol emulsion, polyacrylic acid salt emulsion and polyacrylamide emulsion, and those familiar to those skilled in the art can be used.

[0030] In terms of mass fraction, the multi-effect stabilizer provided by the present invention includes 1% to 10% of nano-silicon dioxide, specifically 1%, 3%, 5%, 8% or 10%; the average particle size of the nano-silicon dioxide is preferably less than 50nm, specifically 5nm, 10nm, 20nm, 30nm or 40nm.

[0031] In terms of mass fraction, the multi-effect stabilizer provided by the present invention comprises 1% to 10% of cellulose ether, specifically 1%, 3%, 5%, 8% or 10%; the cellulose ether is preferably a low-viscosity cellulose ether, specifically, the viscosity of a 2wt% aqueous solution of the cellulose ether is 5mPa·s.

[0032] In terms of mass fraction, the multi-effect stabilizer provided by the present invention includes 0.5% to 5% of organic silane, specifically 0.5%, 1%, 2%, 3%, 4% or 5%; the organic silane preferably includes one or more of γ-aminopropyltriethoxysilane, propyltrimethoxysilane and methyltrimethoxysilane.

[0033] Calculated by mass fraction, the multi-effect stabilizer provided by the present invention includes a balance of water; the water is preferably deionized water.

[0034] In the present invention, the multi-effect stabilizer preferably also includes 0.5% to 5% of a phosphate dispersant, specifically 0.5%, 1%, 2%, 3%, 4% or 5%, by mass fraction; the phosphate dispersant preferably includes one or more of bisphenol A phosphate, oleamide phosphate betaine and nonylphenol polyether phosphate.

[0035] In the present invention, the multi-effect stabilizer preferably also includes 0.5% to 5% of an organic amine retarder, specifically 0.5%, 1%, 2%, 3%, 4% or 5%, by mass fraction; the organic amine retarder preferably includes one or two of ethylenediaminetetramethylenephosphonic acid and diethylenetriaminepentamethylenephosphonic acid.

[0036] The present invention also provides a method for preparing the multi-effect stabilizer described in the above scheme, comprising the following steps:

[0037] The polymer emulsion, nano silicon dioxide, cellulose ether, organic silane and water are mixed to obtain the multi-effect stabilizer.

[0038] Figure 2 The schematic diagram of the process of preparing the multi-effect stabilizer of the present invention is shown below. Figure 2 Provide detailed explanation.

[0039] In the present invention, the mixing preferably includes: first stirring the polymer emulsion, then adding nano-silicon dioxide, cellulose ether and organosilane for second stirring, then adding water, and third stirring the resulting mixture to obtain the multi-effect stabilizer; the first stirring speed is preferably 1000 to 2000 rpm, specifically 1000 rpm, 1300 rpm, 1500 rpm or 1800 rpm, and the stirring time is 3 to 5 min; the second stirring speed is 800 The stirring speed is 1500-2500 rpm, specifically 1500 rpm, 1800 rpm, 2000 rpm or 2500 rpm, and the stirring time is 10-15 min. The first stirring and the second stirring are both high-speed shear stirring. The nano silicon dioxide, cellulose ether and organosilane are preferably added in sequence. The third stirring speed is 1500-2500 rpm, specifically 1500 rpm, 1800 rpm, 2000 rpm or 2500 rpm, and the stirring time is 10-15 min.

[0040] In the present invention, when the multi-effect stabilizer further includes a phosphate dispersant and an organic amine retarder, before adding water, preferably, the phosphate dispersant and the organic amine retarder are added for low-speed stirring, and the rotation speed of the low-speed stirring is preferably 500 to 1000 rpm, specifically 600 rpm, 800 rpm or 1000 rpm, and the stirring time is 2 to 4 minutes. In a specific embodiment of the present invention, preferably, after the second stirring is completed, the phosphate dispersant and the organic amine retarder are added for low-speed stirring, and water is added after the low-speed stirring is completed.

[0041] The present invention also provides the use of the multi-effect stabilizer described in the above scheme or the multi-effect stabilizer prepared by the preparation method described in the above scheme in shield double-liquid cement slurry.

[0042] The present invention also provides a two-liquid cement slurry, comprising the multi-effect stabilizer described in the above scheme or the multi-effect stabilizer prepared by the preparation method described in the above scheme; the addition amount of the multi-effect stabilizer in the two-liquid cement slurry is preferably 2‰ to 5‰, more preferably 3‰.

[0043] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] In the following examples, the polyacrylamide emulsion used is EM533 (anionic emulsion), the solid content is greater than 40%, the average particle size of nano-silicon dioxide is less than 50 nm, and the viscosity of a 2 wt % aqueous solution of cellulose ether is 5 mPa·s.

[0045] Example 1

[0046] The components of the multi-effect stabilizer of this embodiment are as follows: 15% (150g) of polyacrylamide emulsion, 5% (50g) of nano-silicon dioxide, 5% (50g) of cellulose ether, 2% (20g) of organosilane, 1% (10g) of phosphate dispersant, 3% (30g) of organic amine retarder, and the balance is deionized water; wherein, the organosilane is γ-aminopropyltriethoxysilane, the phosphate dispersant is bisphenol A phosphate, and the organic amine retarder is ethylenediaminetetramethylenephosphoric acid.

[0047] The preparation method of the multi-effect stabilizer is as follows: First, add the polyacrylamide emulsion to the mixing container, use high-speed shear stirring, control the stirring speed at 2000 rpm, and stir for 5 minutes to ensure sufficient mixing. Then, add nano-silica, cellulose ether and organosilane in sequence, continue to use high-speed shear stirring, control the stirring speed at 1500 rpm, and stir for 3 minutes. Next, add phosphate dispersant and organic amine retarder, use low-speed stirring, control the stirring speed at 500 rpm, and stir for 2 minutes. Add deionized water to make the mixture reach the desired concentration. Stir the mixture thoroughly until it is uniform, use medium-speed stirring, control the stirring speed at 1500 rpm, and stir for 10 minutes to obtain a multi-effect stabilizer.

[0048] Example 2

[0049] The components of the multi-effect stabilizer of this embodiment are as follows: 15% (150g) of polyacrylamide emulsion, 5% (50g) of nano-silicon dioxide, 5% (50g) of cellulose ether, 2% (20g) of organic silane, 1.5% (15g) of phosphate dispersant, 4% (40g) of organic amine retarder, and the balance is deionized water; wherein, the organic silane is γ-aminopropyltriethoxysilane, the phosphate dispersant is bisphenol A phosphate, and the organic amine retarder is ethylenediaminetetramethylenephosphoric acid.

[0050] The preparation method of the multi-effect stabilizer is as follows: First, add the polyacrylamide emulsion to the mixing container, use high-speed shear stirring, control the stirring speed at 2000 rpm, and stir for 5 minutes to ensure sufficient mixing. Then, add nano-silica, cellulose ether and organosilane in sequence, continue to use high-speed shear stirring, control the stirring speed at 1500 rpm, and stir for 3 minutes. Next, add phosphate dispersant and organic amine retarder, use low-speed stirring, control the stirring speed at 500 rpm, and stir for 2 minutes. Add deionized water to make the mixture reach the desired concentration. Stir the mixture thoroughly until it is uniform, use medium-speed stirring, control the stirring speed at 1500 rpm, and stir for 10 minutes to obtain a multi-effect stabilizer.

[0051] Example 3

[0052] Other conditions are the same as those in Example 2, except that the percentage of each component in the multi-effect stabilizer is changed to: polyacrylamide emulsion 15% (150 g), nano-silicon dioxide 5% (50 g), cellulose ether 5% (50 g), organosilane 2% (20 g), phosphate dispersant 2% (20 g), organic amine retarder 5% (50 g), and the balance is deionized water.

[0053] The preparation method is the same as that of Example 2.

[0054] Example 4

[0055] The components of the multi-effect stabilizer of this embodiment are as follows: 10% (100g) of polyacrylamide emulsion, 5% (50g) of nano-silicon dioxide, 5% (50g) of cellulose ether, 2% (20g) of organic silane, 2% (20g) of phosphate dispersant, 2% (20g) of organic amine retarder, and the balance is deionized water; wherein, the organic silane is propyltrimethoxysilane, the phosphate dispersant is oleamide phosphate betaine, and the organic amine retarder is diethylenetriamine pentamethylene phosphoric acid.

[0056] The preparation method is the same as that of Example 2.

[0057] Example 5

[0058] Other conditions are the same as those in Example 4, except that the percentage of each component in the multi-effect stabilizer is changed to: polyacrylamide emulsion 15% (150 g), nano-silicon dioxide 5% (50 g), cellulose ether 5% (50 g), organosilane 3% (30 g), phosphate dispersant 2% (20 g), organic amine retarder 3% (30 g), and the balance is deionized water.

[0059] The preparation method is the same as that of Example 2.

[0060] Example 6

[0061] Other conditions are the same as those in Example 4, except that the percentage of each component in the multi-effect stabilizer is changed to: polyacrylamide emulsion 20% (200 g), nano-silicon dioxide 10% (100 g), cellulose ether 10% (100 g), organosilane 5% (50 g), phosphate dispersant 3% (30 g), organic amine retarder 4% (40 g), and the balance is deionized water.

[0062] The preparation method is the same as that of Example 2.

[0063] Example 7

[0064] The components of the multi-effect stabilizer of this embodiment are as follows: 20% (200g) of polyacrylamide emulsion, 10% (100g) of nano-silicon dioxide, 10% (100g) of cellulose ether, 5% (50g) of organosilane, 5% (50g) of phosphate dispersant, 5% (50g) of organic amine retarder, and the balance is deionized water; wherein the organosilane is methyltrimethoxysilane, the phosphate dispersant is nonylphenol polyether phosphate, and the organic amine retarder is diethylenetriaminepentamethylenephosphonic acid.

[0065] The preparation method is the same as that of Example 2.

[0066] Example 8

[0067] Other conditions are the same as those in Example 7, except that the percentage of each component in the multi-effect stabilizer is changed to: polyacrylamide emulsion 15% (150 g), nano-silicon dioxide 7% (70 g), cellulose ether 7% (70 g), organosilane 3% (30 g), phosphate dispersant 3% (30 g), organic amine retarder 3% (30 g), and the balance is deionized water.

[0068] The preparation method is the same as that of Example 2.

[0069] Example 9

[0070] Other conditions are the same as those in Example 7, except that the percentage of each component in the multi-effect stabilizer is changed to: polyacrylamide emulsion 10% (100 g), nano-silicon dioxide 5% (50 g), cellulose ether 5% (50 g), organosilane 2% (20 g), phosphate dispersant 2% (20 g), organic amine retarder 2% (20 g), and the balance is deionized water.

[0071] The preparation method is the same as that of Example 2.

[0072] Test Case

[0073] 1. Test of retarding effect

[0074] The multi-effect stabilizer prepared in Examples 1 to 3 was tested for its slow setting effect, and the specific steps are as follows:

[0075] Add 300g cement powder and 30g sodium bentonite powder to a clean mixing container, use a low-speed stirrer to mix the cement powder and sodium bentonite powder evenly, slowly add 843.5g water, and continue stirring to avoid the formation of lumps. After the cement slurry is mixed evenly, add 3g of the prepared multi-effect stabilizer and continue stirring for at least 5 minutes to ensure that the stabilizer is completely dispersed in the cement slurry. Observe the retarding effect and record the initial setting time of the cement slurry. The test results are shown in Table 1.

[0076] Comparative experiment: Other conditions are the same, only the multi-effect stabilizer is not added, and the initial setting time of cement slurry is tested.

[0077] Table 1 Test results of retarding time

[0078] project Slow setting time / h Example 1 96 Example 2 120 Example 3 200 Comparative experiment ＜8

[0079] It can be seen from the data in Table 1 that after adding the multi-effect stabilizer of the present invention, the retarding time of the cement slurry is greatly prolonged and can reach 200 hours.

[0080] 2. Acid corrosion resistance test

[0081] The acid corrosion resistance test of the multi-effect stabilizer prepared in Examples 4 to 6 was carried out, and the specific steps are as follows:

[0082] Add 300g cement powder and 30g sodium bentonite powder to a clean mixing container, and use a low-speed stirrer to mix the cement powder and sodium bentonite powder evenly. Slowly add 843.5g water while continuing to stir to avoid the formation of lumps. After the cement slurry is mixed evenly, add 3g of the prepared multi-effect stabilizer and continue stirring for at least 5min to ensure that the stabilizer is completely dispersed in the cement slurry. Slowly add the water glass solution to the already stirred cement slurry while continuing to stir, pour the resulting two-liquid cement slurry into the test block mold, and cure for 7 days. Prepare a sulfuric acid solution with a pH value of 2 to 3, remove the cured cement test block from the mold, clean the surface, immerse the test block in the sulfuric acid solution, soak for 15±0.5h, and after soaking, wash the test block, dry it, and weigh it to calculate the weight loss percentage before and after sulfuric acid immersion. The test results are shown in Table 2.

[0083] Comparative experiment: other conditions are the same, only the multi-effect stabilizer is not added, and the acid corrosion resistance of the test piece is tested.

[0084] Table 2 Acid corrosion resistance test results

[0085] project Acid corrosion resistance effect (mass loss percentage before and after sulfuric acid immersion) Example 4 2％ Example 5 1％ Example 6 Less than 0.5% Comparative experiment ＞5％

[0086] According to the data in Table 2, it can be seen that after adding the multi-effect stabilizer of the present invention, the weight loss of the obtained double-liquid cement slurry sample before and after sulfuric acid immersion is very small, indicating that it has excellent acid corrosion resistance.

[0087] 3. Impermeability test

[0088] The acid corrosion resistance test of the multi-effect stabilizer prepared in Examples 7 to 9 was carried out, and the specific steps are as follows:

[0089] In a clean mixing container, first add 300g cement powder and 30g sodium bentonite powder, and use a low-speed stirrer to mix the cement powder and sodium bentonite powder evenly. Slowly add 843.5g water while continuing to stir to avoid the formation of lumps. After the cement slurry is mixed evenly, add 3g of the prepared multi-effect stabilizer and continue stirring for at least 5 minutes to ensure that the stabilizer is completely dispersed in the cement slurry. Slowly add the water glass solution to the already stirred cement slurry while continuing to stir. Pour the resulting two-liquid cement slurry into the test block mold and cure for 7 days. Prepare a clean water tank, remove the cured cement test block from the mold, and clean the surface. Immerse the test block in 20℃ clean water for 24h. After soaking, clean the test block and weigh it. Place the saturated test piece in a blast drying oven controlled at (105±5)℃, dry it for 24h, take out the test piece, cool it to room temperature, weigh it, and calculate the weight loss percentage. The test results are shown in Table 3.

[0090] Comparative experiment: other conditions are the same, only the multi-effect stabilizer is not added, and the impermeability of the specimen is tested.

[0091] Table 3 Impermeability test results

[0092] project Impermeability test (percentage of weight loss before and after immersion in water) Example 7 2％ Example 8 4％ Example 9 5％ Comparative experiment ＞5％

[0093] According to the data in Table 3, it can be seen that after adding the multi-effect stabilizer of the present invention, the weight loss of the obtained two-liquid cement slurry sample before and after being immersed in clean water is very small, indicating that it has excellent anti-seepage performance.

[0094] In addition, the multi-effect stabilizers of Examples 4 to 9 were tested for their retarding performance, and the results showed that they had excellent retarding effect. The multi-effect retarders of Examples 1 to 3 and 7 to 9 were tested for their acid corrosion resistance, and the results showed that the weight loss of the specimens before and after immersion in sulfuric acid was very small. The multi-effect stabilizers of Examples 1 to 6 were tested for their impermeability, and the results showed that the weight loss of the specimens before and after immersion in clean water was very small.

[0095] In summary, the multi-effect stabilizer provided by the present invention can significantly improve the stability and fluidity of two-liquid cement slurry, prolong the retarding time of cement slurry components, improve the anti-permeability and acid corrosion resistance of two-liquid cement slurry, and thus improve its durability; the stabilizer is particularly suitable for environments with high groundwater levels or highly acidic water, and can effectively resist the acid corrosion of groundwater.

[0096] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A multi-effect stabilizer, characterized in that: The invention comprises the following components in mass fraction: 5% to 20% of polymer emulsion, 1% to 10% of nano silicon dioxide, 1% to 10% of cellulose ether, 0.5% to 5% of organic silane, and the balance is water; the solid content of the polymer emulsion is more than 30%.

2. The multi-effect stabilizer according to claim 1, characterized in that: The polymer emulsion is one or more of polyvinyl alcohol emulsion, polyacrylate emulsion and polyacrylamide emulsion.

3. The multi-effect stabilizer according to claim 1, characterized in that: The average particle size of the nano-silicon dioxide is less than 50 nm; the organic silane includes one or more of γ-aminopropyltriethoxysilane, propyltrimethoxysilane and methyltrimethoxysilane.

4. The multi-effect stabilizer according to claim 1, characterized in that: Calculated by mass fraction, the multi-effect stabilizer also includes: 0.5% to 5% of a phosphate dispersant and 0.5% to 5% of an organic amine retarder.

5. The multi-effect stabilizer according to claim 4, characterized in that: The phosphate dispersant includes one or more of bisphenol A phosphate, oleic acid amide phosphate betaine and nonylphenol polyether phosphate; The organic amine retarder includes one or both of ethylenediaminetetramethylenephosphonic acid and diethylenetriaminepentamethylenephosphonic acid.

6. The method for preparing the multi-effect stabilizer according to any one of claims 1 to 3, characterized in that: The following steps are involved: The polymer emulsion, nano silicon dioxide, cellulose ether, organic silane and water are mixed to obtain the multi-effect stabilizer.

7. The preparation method according to claim 6, characterized in that: The mixing comprises: first stirring the polymer emulsion, then adding nano-silicon dioxide, cellulose ether and organosilane for second stirring, then adding water, and third stirring the obtained mixture to obtain the multi-effect stabilizer; the rotation speed of the first stirring is 1000-2000 rpm, and the stirring time is 3-5 min; the rotation speed of the second stirring is 800-1500 rpm, and the stirring time is 3-5 min; the rotation speed of the third stirring is 1500-2500 rpm, and the stirring time is 10-15 min.

8. The preparation method according to claim 7, characterized in that: When the multi-effect stabilizer also includes a phosphate dispersant and an organic amine retarder, before adding water, the phosphate dispersant and the organic amine retarder are also added and stirred at a low speed, and the rotation speed of the low-speed stirring is 500-1000 rpm, and the stirring time is 2-4 minutes.

9. Use of the multi-effect stabilizer according to any one of claims 1 to 5 or the multi-effect stabilizer prepared by the preparation method according to any one of claims 6 to 8 in shield double-liquid cement slurry.

10. A two-liquid cement slurry, characterized in that: The invention comprises the multi-effect stabilizer according to any one of claims 1 to 5 or the multi-effect stabilizer prepared by the preparation method according to any one of claims 6 to 8.

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