CN113072321A - Capillary crystalline modified waterproof agent for concrete - Google Patents
Capillary crystalline modified waterproof agent for concrete Download PDFInfo
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- CN113072321A CN113072321A CN202110428435.6A CN202110428435A CN113072321A CN 113072321 A CN113072321 A CN 113072321A CN 202110428435 A CN202110428435 A CN 202110428435A CN 113072321 A CN113072321 A CN 113072321A
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- 239000004567 concrete Substances 0.000 title claims abstract description 54
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 39
- 239000002041 carbon nanotube Substances 0.000 claims abstract description 33
- 229910021393 carbon nanotube Inorganic materials 0.000 claims abstract description 33
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 19
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims abstract description 17
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims abstract description 17
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims abstract description 17
- 239000003961 penetration enhancing agent Substances 0.000 claims abstract description 13
- 238000002425 crystallisation Methods 0.000 claims abstract description 12
- 230000008025 crystallization Effects 0.000 claims abstract description 12
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims abstract description 10
- 235000002906 tartaric acid Nutrition 0.000 claims abstract description 10
- 239000011975 tartaric acid Substances 0.000 claims abstract description 10
- HXKKHQJGJAFBHI-UHFFFAOYSA-N 1-aminopropan-2-ol Chemical compound CC(O)CN HXKKHQJGJAFBHI-UHFFFAOYSA-N 0.000 claims abstract description 8
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052783 alkali metal Inorganic materials 0.000 claims abstract description 7
- 150000001340 alkali metals Chemical class 0.000 claims abstract description 7
- 239000004094 surface-active agent Substances 0.000 claims abstract description 7
- 238000004078 waterproofing Methods 0.000 claims description 27
- 238000003756 stirring Methods 0.000 claims description 20
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 12
- ITCAUAYQCALGGV-XTICBAGASA-M sodium;(1r,4ar,4br,10ar)-1,4a-dimethyl-7-propan-2-yl-2,3,4,4b,5,6,10,10a-octahydrophenanthrene-1-carboxylate Chemical compound [Na+].C([C@@H]12)CC(C(C)C)=CC1=CC[C@@H]1[C@]2(C)CCC[C@@]1(C)C([O-])=O ITCAUAYQCALGGV-XTICBAGASA-M 0.000 claims description 12
- 239000006185 dispersion Substances 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 239000008367 deionised water Substances 0.000 claims description 7
- 229910021641 deionized water Inorganic materials 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 239000002048 multi walled nanotube Substances 0.000 claims description 3
- IVKNZCBNXPYYKL-UHFFFAOYSA-N 2-[2-[2-[2-[2-[2-[2-[2-[2-[2-[4-(2,4,4-trimethylpentan-2-yl)phenoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethanol Chemical compound CC(C)(C)CC(C)(C)C1=CC=C(OCCOCCOCCOCCOCCOCCOCCOCCOCCOCCO)C=C1 IVKNZCBNXPYYKL-UHFFFAOYSA-N 0.000 claims description 2
- 239000004115 Sodium Silicate Substances 0.000 claims description 2
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 2
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 2
- PAZHGORSDKKUPI-UHFFFAOYSA-N lithium metasilicate Chemical compound [Li+].[Li+].[O-][Si]([O-])=O PAZHGORSDKKUPI-UHFFFAOYSA-N 0.000 claims description 2
- 229910052912 lithium silicate Inorganic materials 0.000 claims description 2
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 2
- XYRAEZLPSATLHH-UHFFFAOYSA-N trisodium methoxy(trioxido)silane Chemical compound [Na+].[Na+].[Na+].CO[Si]([O-])([O-])[O-] XYRAEZLPSATLHH-UHFFFAOYSA-N 0.000 claims description 2
- 230000004048 modification Effects 0.000 claims 1
- 238000012986 modification Methods 0.000 claims 1
- 229940083575 sodium dodecyl sulfate Drugs 0.000 claims 1
- 235000019333 sodium laurylsulphate Nutrition 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 6
- 230000035699 permeability Effects 0.000 abstract description 4
- 230000003487 anti-permeability effect Effects 0.000 abstract description 2
- 230000007797 corrosion Effects 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 abstract description 2
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 7
- 238000002156 mixing Methods 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 7
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- FWVCSXWHVOOTFJ-UHFFFAOYSA-N 1-(2-chloroethylsulfanyl)-2-[2-(2-chloroethylsulfanyl)ethoxy]ethane Chemical compound ClCCSCCOCCSCCCl FWVCSXWHVOOTFJ-UHFFFAOYSA-N 0.000 description 1
- HDETVIAMQNTONT-UHFFFAOYSA-N C[SiH2]O.[Na] Chemical compound C[SiH2]O.[Na] HDETVIAMQNTONT-UHFFFAOYSA-N 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052909 inorganic silicate Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000005543 nano-size silicon particle Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 230000007928 solubilization Effects 0.000 description 1
- 238000005063 solubilization Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/65—Water proofers or repellants
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Sealing Material Composition (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
A permeable crystallization type modified waterproof agent for concrete comprises the following raw materials in percentage by mass: 25-35% of alkali metal organic silicate, 4-6.5% of surfactant, 6.5-9.5% of modified carbon nanotube penetration enhancer, 3.8-6.6% of tartaric acid, 5.2-7.8% of diethanol monoisopropanolamine, 1-2.5% of ethylene glycol and 37-45% of water. The carbon nano tube grafted polyvinylpyrrolidone adopted by the invention can improve the strength and the whole anti-permeability and anti-seismic performance of concrete; the invention has strong permeability, enhances the compactness, strength and hardness of the concrete, and achieves the waterproof effect with the same service life as the concrete in the real sense; the invention is green and environment-friendly, and has concrete workability and corrosion resistance. Low temperature resistance, wide application in construction of various structural engineering and concrete pouring, simple production process, low cost and easy large-scale production.
Description
Technical Field
The invention relates to a concrete waterproofing agent, in particular to a capillary crystalline waterproofing agent for concrete.
Background
The traditional concrete is a heterogeneous porous material, a large number of micro-structural defects exist in the traditional concrete, the micro-defects can be expanded into a water seepage channel of later-stage concrete under certain conditions, water resistance is very important in the technical field of building engineering, and a waterproof material is also an important functional material in the building engineering. With the continuous development and progress of society and science and technology, building engineering puts higher requirements on waterproof quality. To date, there are five main approaches to the construction of water-proof engineering: asphalt waterproofing, additive waterproofing, elastic coiled material waterproofing, paint waterproofing and soaking waterproofing. In the waterproof methods, the additive waterproof can improve the workability of concrete and improve the freeze-thaw resistance, the compactness and the impermeability of the concrete, is suitable for pumping concrete and thin-wall waterproof structures, and has the advantages of low cost, simple and convenient construction, good durability and the like.
In recent years, the building waterproof material industry in China has been greatly developed, but the problems existing at present are still very serious. The leakage rate of the building is high, and the quality of the waterproof engineering is difficult to ensure. The statistics of construction leakage by the construction department show that the leakage rate of the engineering is about 60%, and at present, the leakage rate is not improved obviously. The development of novel waterproof materials and the improvement of waterproof quality become urgent matters in the building waterproof industry.
CN110723986A discloses a cement surface permeable crystallization plugging type rigid waterproof agent which is characterized by comprising the following components in parts by weight: 1-90 parts of an inorganic silicate composite hardening agent; 1-5 parts of polyether polyol gel; 1-10 parts of a silane coupling filler; 5-10 parts of a penetrating agent T; 3-9 parts of a nano silicon catalyst. The waterproof agent obtained by the process method has the advantages of strong permeability, long service life and acid and alkali resistance. But the compatibility of each component is poor, the components are unstable, the film forming property is poor, and the waterproof structural strength is not high.
Disclosure of Invention
The invention aims to solve the technical problems that the defects in the prior art are overcome, and a capillary crystalline modified waterproof agent for concrete is provided; the water-proofing agent can be added into concrete mixture to obviously raise strength and impermeability of concrete.
The technical scheme adopted by the invention for solving the technical problems is as follows: a permeable crystallization type modified waterproof agent for concrete comprises the following raw materials in percentage by mass: 25 to 35 percent of alkali metal organic silicate, 4 to 6.5 percent of surfactant, 6.5 to 9.5 percent of modified carbon nano tube penetration enhancer, 3.8 to 6.6 percent of tartaric acid, 5.2 to 7.8 percent of diethanol monoisopropanolamine, 1 to 2.5 percent of glycol and 37 to 45 percent of water.
The permeable crystallization type modified waterproof agent for concrete is preferably prepared from the following raw materials in percentage by mass: 29 to 33 percent of alkali metal organic silicate, 4.5 to 6.2 percent of surfactant, 6.8 to 9.2 percent of modified carbon nano tube penetration enhancer, 4 to 6.3 percent of tartaric acid, 5.6 to 7.4 percent of diethanol monoisopropanolamine, 1.2 to 2 percent of glycol and 40 to 43 percent of water.
The permeable crystallization type modified waterproof agent for concrete is more preferably prepared from the following raw materials in percentage by mass: 29.5 to 32.8 percent of alkali metal organic silicate, 4.8 to 6 percent of surfactant, 7 to 9 percent of modified carbon nano tube penetration enhancer, 4.3 to 6.1 percent of tartaric acid, 5.9 to 7.1 percent of diethanol monoisopropanolamine, 1.4 to 1.8 percent of glycol and 41 to 42.5 percent of water.
Preferably, the alkali metal organic silicate is one or more of sodium silicate, sodium methyl silicate, and lithium silicate.
Preferably, the surfactant is one or more than two of AES, OP-10, sodium dodecyl benzene sulfonate and sodium dodecyl sulfate.
Preferably, the tartaric acid, diethanolisopropanolamine and ethylene glycol are all technical grades.
Preferably, the preparation method of the modified carbon nanotube penetration enhancer comprises the following steps: dispersing the carbon nano tube in deionized water under the stirring state to obtain carbon nano tube dispersion liquid; heating to 60-70 ℃, dropwise adding a polyvinylpyrrolidone solution, and stirring for reaction for 2-3 h; dropwise adding sodium abietate and a silane coupling agent, stirring and reacting for 1-1.5 h, ultrasonically dispersing for 15-30 min, and drying at 90-100 ℃ to obtain the product.
Preferably, the carbon nanotube is a multi-wall carbon nanotube with the diameter of 10-20nm and the length of 5-15 μm.
Preferably, the concentration of the carbon nanotube dispersion is 10.0g/L to 20.0 g/L.
Preferably, the concentration of the polyvinylpyrrolidone solution is 60.0 g/L-100.0 g/L, and the mass ratio of the polyvinylpyrrolidone solution to the carbon nanotubes is 1: 1.6-2.2, more preferably 1: 1.8-2.1.
Preferably, the mass ratio of the sodium abietate to the carbon nano tube is 1: 4.2-5.2, and more preferably 1: 4.6-5.1.
Preferably, the mass ratio of the silane coupling agent to the carbon nano tube is 1: 4.2-5.2, and more preferably 1: 4.6-5.1.
This example was a capillary crystalline modified waterproofing agent for concrete, which was prepared by mixing the raw materials uniformly.
Compared with the prior art, the invention has the following advantages:
(1) the carbon nano tube is adopted to graft the polyvinylpyrrolidone, the polyvinylpyrrolidone has excellent dispersibility, emulsibility, solubilization and permeability, the carbon nano tube has good flexibility and has the characteristics of high modulus and high strength, and the carbon nano tube and the polyvinylpyrrolidone are compounded and cooperated to improve the strength of concrete and the integral anti-permeability and anti-seismic performance.
(2) The water-proofing agent has strong permeability, can generate a chemical reaction with free alkali in concrete to generate an irreversible compound silica eutectic, and the eutectic has growth property, can grow along concrete capillary pores when being contacted with water and calcareous ions in the concrete again, so that all pores of the concrete are blocked.
(3) The waterproof agent is green and environment-friendly, improves concrete workability and resists corrosion. Low temperature resistance, etc., can be widely applied to the construction of various structural engineering and concrete pouring, has simple production process and low cost, and is easy for large-scale production.
Detailed Description
The present invention will be further described with reference to examples and comparative examples.
The starting materials used in the examples of the present invention and comparative examples were obtained from conventional commercial sources.
Tartaric acid, diethanolisopropanolamine and ethylene glycol used below are all technical grade; the carbon nano-tube is a multi-wall carbon nano-tube with the diameter of 10-20nm and the length of 5-15 mu m.
Example 1
The permeable crystallization type modified waterproof agent for concrete in the embodiment comprises the following raw materials in percentage by mass:
the preparation method of the modified carbon nano tube penetration enhancer comprises the following steps: under the stirring state, 15g of carbon nano tube is dispersed in 1L of deionized water to obtain carbon nano tube dispersion liquid with the concentration of 15.0 g/L; heating to 60 ℃, dropwise adding 100mL of 75.0g/L polyvinylpyrrolidone solution, and stirring for reaction for 3 h; dropwise adding 3.0g of sodium abietate and 3.0g of silane coupling agent, stirring and reacting for 1.2h, ultrasonically dispersing for 30min, and drying at 95 ℃ to obtain the product.
This example was a capillary crystalline modified waterproofing agent for concrete, which was prepared by mixing the raw materials uniformly.
Example 2
The permeable crystallization type modified waterproof agent for concrete in the embodiment comprises the following raw materials in percentage by mass:
the preparation method of the modified carbon nano tube penetration enhancer comprises the following steps: dispersing 12g of carbon nano tube in 1L of deionized water under the stirring state to obtain carbon nano tube dispersion liquid with the concentration of 12.0 g/L; heating to 65 ℃, dropwise adding 100mL of 60.0g/L polyvinylpyrrolidone solution, and stirring for reaction for 2 h; dropwise adding 2.4g of sodium abietate and 2.4g of silane coupling agent, stirring and reacting for 1.5h, ultrasonically dispersing for 20min, and drying at 98 ℃ to obtain the product.
This example was a capillary crystalline modified waterproofing agent for concrete, which was prepared by mixing the raw materials uniformly.
Example 3
The permeable crystallization type modified waterproof agent for concrete in the embodiment comprises the following raw materials in percentage by mass:
the preparation method of the modified carbon nano tube penetration enhancer comprises the following steps: dispersing 18g of carbon nano tube in 1L of deionized water under the stirring state to obtain carbon nano tube dispersion liquid with the concentration of 18.0 g/L; heating to 64 ℃, dropwise adding 100mL of polyvinylpyrrolidone solution with the concentration of 90.0g/L, and stirring for reaction for 2.5 h; dropwise adding 3.6g of sodium abietate and 3.6g of silane coupling agent, stirring and reacting for 1.5h, ultrasonically dispersing for 25min, and drying at 100 ℃ to obtain the product.
This example was a capillary crystalline modified waterproofing agent for concrete, which was prepared by mixing the raw materials uniformly.
Example 4
The permeable crystallization type modified waterproof agent for concrete in the embodiment comprises the following raw materials in percentage by mass:
the preparation method of the modified carbon nano tube penetration enhancer comprises the following steps: dispersing 16g of carbon nano tubes in 1L of deionized water under the stirring state to obtain 16.0g/L carbon nano tube dispersion liquid; heating to 68 ℃, dropwise adding 100mL of 80.0g/L polyvinylpyrrolidone solution, and stirring for reaction for 2 h; dropwise adding 3.2g of sodium abietate and 3.2g of silane coupling agent, stirring and reacting for 1h, ultrasonically dispersing for 15min, and drying at 90 ℃ to obtain the product.
This example was a capillary crystalline modified waterproofing agent for concrete, which was prepared by mixing the raw materials uniformly.
Example 5
The permeable crystallization type modified waterproof agent for concrete in the embodiment comprises the following raw materials in percentage by mass:
the preparation method of the modified carbon nano tube penetration enhancer comprises the following steps: under the stirring state, 20g of carbon nano tube is dispersed in 1L of deionized water to obtain carbon nano tube dispersion liquid with the concentration of 20.0 g/L; heating to 70 ℃, dropwise adding 100mL of polyvinylpyrrolidone solution with the concentration of 100.0g/L, and stirring for reaction for 2.5 h; 4.0g of sodium abietate and 4.0g of silane coupling agent are dripped, stirred and reacted for 1 hour, ultrasonically dispersed for 25min, and dried at the temperature of 92 ℃ to obtain the product.
This example was a capillary crystalline modified waterproofing agent for concrete, which was prepared by mixing the raw materials uniformly.
Comparative example
The waterproof agent of the comparative example comprises the following raw materials: 60g of sodium methyl silanol, 109 g of OP-109 g, 6.84g of carbon nano tube, 3.42g of polyvinylpyrrolidone, 1.37g of sodium abietate, 1.37g of silane coupling agent, 8g of tartaric acid, 13g of diethanol monoisopropanolamine, 3.2g of ethylene glycol and 78g of water; the water repellent of this comparative example was produced by uniformly mixing the raw materials used.
The raw materials used in this comparative example were completely identical to those of example 5; the preparation method is basically the same, and the difference is that the carbon nano tube, the polyvinylpyrrolidone, the sodium abietate and the silane coupling agent are not prepared into the modified carbon nano tube penetration enhancer in advance.
Detection of water resistance
The water-proofing agents prepared in comparative example and examples 1-5 were added to concrete in an amount of 2% (based on the total weight of the cementitious material), and tested according to GB18445-2012 "cement-based permeable crystalline water-proofing material", JC474-2008 "mortar, concrete water-proofing agent", and GB8076-2008 "concrete admixture specification", and the test results are shown in table 1.
TABLE 1 Performance test results for comparative examples and examples 1-5 coatings
As can be seen from Table 1, the tested concrete of 5 samples of examples doped with the aqueous capillary crystalline waterproofing agent of the invention has a penetration height ratio below 25% and a significant increase in penetration depth; the water permeation resistance pressure ratio is also improved to about 338%; the compressive strength ratio of 7d to 28d is more than 105%, the water absorption in 48 hours is less than 50%, all indexes are obviously superior to those of a comparative example, and the performance of the whole tested concrete is better.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present specification describes embodiments, such descriptions are provided for clarity only, and those skilled in the art should be able to take the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments that can be understood by those skilled in the art.
Claims (10)
1. A permeable crystallization type modified waterproof agent for concrete is characterized by comprising the following raw materials in percentage by mass: 25-35% of alkali metal organic silicate, 4-6.5% of surfactant, 6.5-9.5% of modified carbon nanotube penetration enhancer, 3.8-6.6% of tartaric acid, 5.2-7.8% of diethanol monoisopropanolamine, 1-2.5% of ethylene glycol and 37-45% of water.
2. A capillary crystalline modifying and waterproofing agent for concrete according to claim 1, wherein said alkali metal organic silicate is one or more of sodium silicate, sodium methyl silicate and lithium silicate.
3. A capillary crystalline modifying and waterproofing agent according to claim 1 or 2, wherein the surfactant is one or more of AES, OP-10, sodium dodecylbenzenesulfonate and sodium dodecylsulfate.
4. A capillary crystalline modifying waterproofing agent for concrete according to claim 1 or 2 wherein the tartaric acid, diethanol monoisopropanolamine and ethylene glycol are all technical grades.
5. A capillary crystalline modifying waterproofing agent for concrete according to claim 3 wherein the tartaric acid, diethanol monoisopropanolamine and ethylene glycol are all technical grades.
6. A capillary crystalline modified waterproofing agent for concrete according to any one of claims 1 to 5, wherein the modified carbon nanotube penetration enhancer is prepared by a method comprising: dispersing the carbon nano tube in deionized water under the stirring state to obtain carbon nano tube dispersion liquid; heating to 60-70 ℃, dropwise adding a polyvinylpyrrolidone solution, and stirring for reaction for 2-3 h; dropwise adding sodium abietate and a silane coupling agent, stirring and reacting for 1-1.5 h, ultrasonically dispersing for 15-30 min, and drying at 90-100 ℃ to obtain the product.
7. The permeable crystallization type modified waterproof agent for concrete according to claim 6, wherein the carbon nanotubes are multiwalled carbon nanotubes with the diameter of 10-20nm and the length of 5-15 mu m.
8. A capillary crystalline modifying and waterproofing agent for concrete according to claim 5 or 6, wherein the concentration of the carbon nanotube dispersion is 10.0 to 20.0 g/L; the concentration of the polyvinylpyrrolidone solution is 60.0 g/L-100.0 g/L, and the mass ratio of the polyvinylpyrrolidone solution to the carbon nano tube is 1: 1.6-2.2.
9. A capillary crystalline modified waterproofing agent for concrete according to claim 5 or 6, wherein the mass ratio of the sodium abietate to the carbon nanotubes is 1: 4.2 to 5.2; the mass ratio of the silane coupling agent to the carbon nano tube is 1: 4.2-5.2.
10. The capillary crystalline modification waterproofing agent for concrete according to claim 7, wherein the mass ratio of the sodium abietate to the carbon nanotubes is 1: 4.2 to 5.2; the mass ratio of the silane coupling agent to the carbon nano tube is 1: 4.2-5.2.
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| CN202110428435.6A CN113072321A (en) | 2021-04-21 | 2021-04-21 | Capillary crystalline modified waterproof agent for concrete |
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| CN202110428435.6A CN113072321A (en) | 2021-04-21 | 2021-04-21 | Capillary crystalline modified waterproof agent for concrete |
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| CN113072321A true CN113072321A (en) | 2021-07-06 |
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| CN202110428435.6A Pending CN113072321A (en) | 2021-04-21 | 2021-04-21 | Capillary crystalline modified waterproof agent for concrete |
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Application publication date: 20210706 |