CN112624660A - Air entraining agent for anti-freezing concrete in high-altitude area and preparation method thereof - Google Patents
Air entraining agent for anti-freezing concrete in high-altitude area and preparation method thereof Download PDFInfo
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- 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
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
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- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
- C08F283/065—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals on to unsaturated polyethers, polyoxymethylenes or polyacetals
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- 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
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/304—Air-entrainers
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Abstract
The invention discloses an air entraining agent for anti-freezing concrete in a high-altitude area, which is characterized by being prepared from the following components in percentage by mass: 10-25% of sodium fatty alcohol polyoxyethylene ether sulfate, 5-10% of sodium dodecyl sulfate, 1-5% of dodecyl betaine, 1-5% of cocamidopropyl hydroxysultaine, 1-5% of cocamidopropyl amine oxide, 1-5% of modified silicon resin polyether microemulsion and 50-70% of polycarboxylic acid air entraining agent. The air entraining agent prepared by the method has excellent air entraining and air stabilizing effects through design synthesis and reasonable blending of the proportion of each component, and is suitable for the anti-freezing concrete in high-altitude low-air-pressure areas.
Description
Technical Field
The invention relates to the field of air entraining agents for concrete. More particularly, the invention relates to an air entraining agent for anti-freezing concrete in a high-altitude area.
Background
The frost resistance of concrete is always an important component in the field of concrete durability research at home and abroad at present, and is one of the most serious problems in concrete engineering in severe cold regions, and the addition of an air entraining agent in concrete is one of key measures for improving the frost resistance of the concrete. Currently, the types of concrete air entraining agents commonly used are: (1) the rosin has the characteristics of simple preparation, low price, good foamability, large bubbles and the like; (2) the alkyl benzene sulfonate has the characteristics of good foamability, large bubbles, poor foam stability and the like; (3) saponins have the characteristics of good water solubility, deliquescence, good bubble structure and the like; (4) fatty acid and salts thereof have the characteristics of poor foamability, small bubbles and the like; (5) fatty alcohol polyoxyethylene ether sulfate has the advantages of both anionic and nonionic air entraining agents.
Although the concrete air entraining agent has various products, few concrete air entraining agents are suitable for frost-resistant concrete in high altitude areas (above an altitude of 3000m and below atmospheric pressure of 70 kPa), and the problems of high air entraining agent mixing amount, poor foamability, easy bubble breakage and poor foam stabilizing performance are often caused by low atmospheric pressure.
Disclosure of Invention
The invention aims to provide an air entraining agent for anti-freezing concrete in a high-altitude area, which fully exerts the synergistic effect of all components through synthesis and compounding technology, so that the air entraining agent has more excellent foaming and foam stabilizing properties.
To achieve these objects and other advantages in accordance with the present invention, there is provided an air entraining agent for anti-freeze concrete for a high altitude area, which is prepared from the following components in percentage by mass: 10-25% of sodium fatty alcohol polyoxyethylene ether sulfate, 5-10% of sodium dodecyl sulfate, 1-5% of dodecyl betaine, 1-5% of cocamidopropyl hydroxysultaine, 1-5% of cocamidopropyl amine oxide, 1-5% of modified silicon resin polyether microemulsion and 50-70% of polycarboxylic acid air entraining agent.
According to a preferred embodiment of the invention, the air entraining agent for the anti-freezing concrete in the high-altitude area is prepared from the following components in percentage by mass: 15-20% of sodium fatty alcohol polyoxyethylene ether sulfate, 8-10% of sodium dodecyl sulfate, 1-3% of dodecyl betaine, 1-3% of cocamidopropyl betaine, 2-4% of cocamidopropyl hydroxysulfobetaine, 1-3% of cocamidopropyl amine oxide, 1-3% of modified silicon resin polyether microemulsion and 60-65% of polycarboxylic acid air entraining agent.
A preparation method of an air entraining agent for anti-freezing concrete in a high-altitude area comprises the following steps:
1) at normal temperature, adding a polycarboxylic acid air entraining agent into production equipment according to the mass ratio, adding sodium dodecyl sulfate under the condition of the rotating speed of 120rpm, and stirring for 20-30 min;
2) adding sodium fatty alcohol-polyoxyethylene ether sulfate, and stirring for 15-20 min;
3) adding dodecyl betaine, cocamidopropyl hydroxysultaine, and cocamidopropyl amine oxide in sequence, and stirring for 15-20 min;
4) adding the modified silicon resin polyether microemulsion, and stirring until the mixture is transparent and bubble-free, thereby obtaining the target product, namely the air entraining agent for the anti-freezing concrete in the high-altitude area.
According to a preferred embodiment of the invention, the air entraining agent for the anti-freeze concrete in the high-altitude area is prepared by the following method:
step A, adding 2-acrylamide-2-methylpropanesulfonic acid and deionized water into a reaction kettle according to the mass ratio of 1 (1-1.5), stirring and heating to obtain a solution A;
step B, adding ammonium persulfate into the solution A, respectively and simultaneously dropwise adding the deionized water mixed solution of N, N-dimethylacrylamide and sodium p-styrenesulfonate and methoxy polyethylene glycol acrylate, after dropwise adding, performing heat preservation reaction, and cooling to room temperature to obtain a solution B; wherein in the deionized water mixed solution of the N, N-dimethylacrylamide and the sodium p-styrenesulfonate, the mass ratio of the N, N-dimethylacrylamide to the deionized water is (1-1.5): 1.
and step C, finally adding liquid caustic soda into the solution B, and adjusting the pH value to 6-7 to obtain the polycarboxylic acid air entraining agent.
According to a preferred embodiment of the invention, the air entraining agent for the anti-freezing concrete in the high-altitude area comprises the following components, by mass, 1 (0.5-1.0) part (0.2-0.45) part (7.0-12.0) part (0.1-0.2) part (2-acrylamido-2-methylpropanesulfonic acid), N-dimethylacrylamide part (N, N-dimethylacrylamide), sodium p-styrenesulfonate, methoxy polyethylene glycol acrylate and ammonium persulfate.
According to a preferred embodiment of the invention, the molecular weight of the methoxy polyethylene glycol acrylate is 350-600.
According to a preferred embodiment of the invention, in the air entraining agent for the anti-freeze concrete in the high altitude area, in the step A, 2-acrylamido-2-methylpropanesulfonic acid and deionized water are added into a reaction kettle, stirred and heated to 55-65 ℃.
According to a preferred embodiment of the invention, in the step B, the dropping time is 2.5-3.5h, the temperature of the heat preservation reaction is 55-65 ℃, and the reaction time is 1-1.5 h.
According to a preferred embodiment of the invention, the air entraining agent for the anti-freeze concrete in the high-altitude area comprises:
a cylindrical body having a hollow interior;
the stirring shaft is vertically arranged in the cylinder body; the stirring shaft is connected to an output shaft of the motor, and is driven by the motor to rotate;
a plurality of stirring blades are distributed on the stirring shaft at intervals; the bottom of the stirring shaft is vertically connected with one end of a suction pipe, the suction pipe is arc-shaped, and the other end of the suction pipe, which is far away from the stirring shaft, is in contact with the inner wall of the cylinder body and does not abut against the inner wall of the cylinder body; the section of the suction pipe is triangular, one surface of the suction pipe is attached to the bottom of the inner wall of the cylinder, and suction holes are formed in the concave side of the suction pipe at intervals;
the stirring shaft and the suction pipe are both hollow and communicated, and the stirring shaft is connected with external air pumping equipment.
According to a preferred embodiment of the invention, the air entraining agent for the anti-freeze concrete in the high-altitude area has a triangular through hole, and the bottom of the through hole is attached to the bottom end of the suction pipe.
The invention at least comprises the following beneficial effects:
the air entraining agent with excellent air entraining and air stabilizing effects for the anti-freezing concrete in the high-altitude and low-air-pressure area can be prepared by adopting the materials of fatty alcohol polyoxyethylene ether sodium sulfate, lauryl betaine, cocamidopropyl hydroxysultaine, cocamidopropyl amine oxide, modified silicone polyether microemulsion and polycarboxylic acid air entraining agent through design synthesis and reasonable blending of the proportion of the components.
The sodium alcohol ether sulphate, the sodium dodecyl sulphate and the dodecyl betaine in the air entraining agent component mainly play a role in air entraining; cocamidopropyl betaine, cocamidopropyl hydroxysultaine and cocamidopropyl amine oxide can play a role in air entraining and air stabilizing; the modified silicon resin polyether microemulsion mainly plays a role in stabilizing gas; the polycarboxylic acid air entraining agent has good air entraining effect, fine and uniform bubbles and excellent air stabilizing performance; the components are reasonably proportioned and have synergistic effect, so that the air entraining and air stabilizing effects are better.
And the molecular structure of the polycarboxylic acid air entraining agent disclosed by the invention has hydrophilic sulfonic groups, lipophilic long carbon chains and benzene rings, and weakly hydrophilic polyester side chains and dimethylformamide groups, so that the polycarboxylic acid air entraining agent can well play a role in air entraining, has relatively high molecular weight and a certain tackifying effect, and can improve the wall thickness and viscoelasticity of bubbles so as to improve the stability of the bubbles.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic view of the structure of a production apparatus of the present invention.
FIG. 2 is a schematic view showing the connection relationship between the stirring shaft and the suction pipe in the present invention.
FIG. 3 is a schematic view of the structure of the straw of the present invention.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be constructed and operated in a particular orientation and thus are not to be considered limiting.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
Example 1
(1) Synthesis of polycarboxylic acid air entraining agent: adding 2-acrylamide-2-methylpropanesulfonic acid and deionized water (the mass ratio of the two is 1:1.2) into a reaction kettle, stirring and heating to 55 ℃ to obtain a solution A; then adding ammonium persulfate into the solution A, respectively and simultaneously dropwise adding a deionized water mixed solution of N, N-dimethylacrylamide and sodium p-styrenesulfonate (the mass ratio of the N, N-dimethylacrylamide to the deionized water is 1.2: 1) and methoxy polyethylene glycol acrylate with the molecular weight of 350 for 2.5h, after dropwise adding, continuing to perform heat preservation reaction at 55 ℃ for 1.5h, and then cooling to room temperature to obtain a solution B; finally, adding liquid caustic soda into the solution B, and adjusting the pH value to 6-7 to obtain a polycarboxylic acid air entraining agent; wherein the mass ratio of the 2-acrylamide-2-methylpropanesulfonic acid to the N, N-dimethylacrylamide to the sodium p-styrene sulfonate to the methoxy polyethylene glycol acrylate to the ammonium persulfate is 1:0.5:0.2:7.0: 0.1.
(2) Preparing an air entraining agent: at normal temperature, firstly adding 65% of polycarboxylic acid air entraining agent into production equipment according to the mass ratio, adding 10% of sodium dodecyl sulfate under the condition of the rotating speed of 120rpm, and stirring for 20 min; then adding 15% of fatty alcohol-polyoxyethylene ether sodium sulfate, and stirring for 15 min; then adding 3% of dodecyl betaine, 1% of cocamidopropyl betaine, 4% of cocamidopropyl hydroxysultaine and 1% of cocamidopropyl amine oxide in sequence, and stirring for 15 min; and finally, adding 1% of modified silicone polyether microemulsion, and stirring until the mixture is transparent and bubble-free to obtain the air entraining agent FY-1 for the anti-freezing concrete in the high altitude area.
Example 2
(1) Synthesis of polycarboxylic acid air entraining agent: adding 2-acrylamide-2-methylpropanesulfonic acid and deionized water (the mass ratio of the two is 1:1.2) into a reaction kettle, stirring and heating to 55 ℃ to obtain a solution A; then adding ammonium persulfate into the solution A, respectively and simultaneously dropwise adding a deionized water mixed solution of N, N-dimethylacrylamide and sodium p-styrenesulfonate (the mass ratio of the N, N-dimethylacrylamide to the deionized water is 1.2: 1) and methoxy polyethylene glycol acrylate with the molecular weight of 350 for 3.0h, after dropwise adding, continuing to perform heat preservation reaction at 55 ℃ for 1.5h, and then cooling to room temperature to obtain a solution B; finally, adding liquid caustic soda into the solution B, and adjusting the pH value to 6-7 to obtain a polycarboxylic acid air entraining agent; wherein the mass ratio of the 2-acrylamide-2-methylpropanesulfonic acid to the N, N-dimethylacrylamide to the sodium p-styrene sulfonate to the methoxy polyethylene glycol acrylate to the ammonium persulfate is 1:0.6:0.25:8.0: 0.12.
(2) Preparing an air entraining agent: at normal temperature, firstly adding 64% of polycarboxylic acid air entraining agent in production equipment according to the mass ratio, adding 10% of sodium dodecyl sulfate under the condition of the rotating speed of 120rpm, and stirring for 20-30 min; then adding 16% of fatty alcohol-polyoxyethylene ether sodium sulfate, and stirring for 15-20 min; sequentially adding 2% of dodecyl betaine, 1% of cocamidopropyl betaine, 3% of cocamidopropyl hydroxysultaine and 2% of cocamidopropyl amine oxide, and stirring for 15-20 min; and finally, adding 2% of modified silicone polyether microemulsion, and stirring until the mixture is transparent and bubble-free to obtain the air entraining agent FY-2 for the anti-freezing concrete in the high altitude area.
Example 3
(1) Synthesis of polycarboxylic acid air entraining agent: adding 2-acrylamide-2-methylpropanesulfonic acid and deionized water (the mass ratio of the two is 1:1.2) into a reaction kettle, stirring and heating to 60 ℃ to obtain a solution A; then adding ammonium persulfate into the solution A, respectively and simultaneously dropwise adding a deionized water mixed solution of N, N-dimethylacrylamide and sodium p-styrenesulfonate (the mass ratio of the N, N-dimethylacrylamide to the deionized water is 1.2: 1) and methoxy polyethylene glycol acrylate with the molecular weight of 400, wherein the dropwise adding time is 3.0h, after the dropwise adding is finished, continuing to perform heat preservation reaction at 60 ℃ for 1.5h, and then cooling to room temperature to obtain a solution B; finally, adding liquid caustic soda into the solution B, and adjusting the pH value to 6-7 to obtain a polycarboxylic acid air entraining agent; wherein the mass ratio of the 2-acrylamide-2-methylpropanesulfonic acid to the N, N-dimethylacrylamide to the sodium p-styrene sulfonate to the methoxy polyethylene glycol acrylate to the ammonium persulfate is 1:0.7:0.3:9.0: 0.15.
(2) Preparing an air entraining agent: at normal temperature, adding 63% of polycarboxylic acid air entraining agent into production equipment according to the mass ratio, adding 9% of sodium dodecyl sulfate under the condition that the rotating speed is 120rpm, and stirring for 20 min; then 17 percent of fatty alcohol-polyoxyethylene ether sodium sulfate is added and stirred for 15 min; sequentially adding 2% of dodecyl betaine, 2% of cocamidopropyl betaine, 3% of cocamidopropyl hydroxysultaine and 2% of cocamidopropyl amine oxide, and stirring for 15-20 min; and finally, adding 2% of modified silicone polyether microemulsion, and stirring until the mixture is transparent and bubble-free to obtain the air entraining agent FY-3 for the anti-freezing concrete in the high altitude area.
Example 4
(1) Synthesis of polycarboxylic acid air entraining agent: adding 2-acrylamide-2-methylpropanesulfonic acid and deionized water (the mass ratio of the two is 1:1.2) into a reaction kettle, stirring and heating to 60 ℃ to obtain a solution A; then adding ammonium persulfate into the solution A, respectively and simultaneously dropwise adding a deionized water mixed solution of N, N-dimethylacrylamide and sodium p-styrenesulfonate (the mass ratio of the N, N-dimethylacrylamide to the deionized water is 1.2: 1) and methoxy polyethylene glycol acrylate with the molecular weight of 400, wherein the dropwise adding time is 3.5h, after the dropwise adding is finished, continuing to perform heat preservation reaction at 60 ℃ for 1.0h, and then cooling to room temperature to obtain a solution B; finally, adding liquid caustic soda into the solution B, and adjusting the pH value to 6-7 to obtain a polycarboxylic acid air entraining agent; wherein the mass ratio of the 2-acrylamide-2-methylpropanesulfonic acid to the N, N-dimethylacrylamide to the sodium p-styrene sulfonate to the methoxy polyethylene glycol acrylate to the ammonium persulfate is 1:0.8:0.35:10: 0.18.
(2) Preparing an air entraining agent: at normal temperature, firstly adding 62% of polycarboxylic acid air entraining agent into production equipment according to the mass ratio, adding 9% of sodium dodecyl sulfate under the condition that the rotating speed is 120rpm, and stirring for 20-30 min; then adding 18% of fatty alcohol-polyoxyethylene ether sodium sulfate, and stirring for 15-20 min; sequentially adding 1% of dodecyl betaine, 3% of cocamidopropyl betaine, 2% of cocamidopropyl hydroxysultaine and 3% of cocamidopropyl amine oxide, and stirring for 15-20 min; and finally, adding 2% of modified silicone polyether microemulsion, and stirring until the mixture is transparent and bubble-free to obtain the air entraining agent FY-4 for the anti-freezing concrete in the high altitude area.
Example 5
(1) Synthesis of polycarboxylic acid air entraining agent: adding 2-acrylamide-2-methylpropanesulfonic acid and deionized water (the mass ratio of the two is 1:1.2) into a reaction kettle, stirring and heating to 65 ℃ to obtain a solution A; then adding ammonium persulfate into the solution A, respectively and simultaneously dropwise adding a deionized water mixed solution of N, N-dimethylacrylamide and sodium p-styrenesulfonate (the mass ratio of the N, N-dimethylacrylamide to the deionized water is 1.2: 1) and methoxy polyethylene glycol acrylate with the molecular weight of 600, wherein the dropwise adding time is 3.0h, after the dropwise adding is finished, continuing to perform heat preservation reaction at 60 ℃ for 1.5h, and then cooling to room temperature to obtain a solution B; finally, adding liquid caustic soda into the solution B, and adjusting the pH value to 6-7 to obtain a polycarboxylic acid air entraining agent; wherein the mass ratio of the 2-acrylamide-2-methylpropanesulfonic acid to the N, N-dimethylacrylamide to the sodium p-styrene sulfonate to the methoxy polyethylene glycol acrylate to the ammonium persulfate is 1:0.9:0.4:11.0: 0.2.
(2) Preparing an air entraining agent: at normal temperature, adding 61% of polycarboxylic acid air entraining agent in production equipment according to the mass ratio, adding 8% of sodium dodecyl sulfate under the condition of the rotating speed of 120rpm, and stirring for 20-30 min; then adding 19% of fatty alcohol-polyoxyethylene ether sodium sulfate, and stirring for 15-20 min; sequentially adding 3% of dodecyl betaine, 2% of cocamidopropyl betaine, 4% of cocamidopropyl hydroxysultaine and 1% of cocamidopropyl amine oxide, and stirring for 15-20 min; and finally, adding 2% of modified silicone polyether microemulsion, and stirring until the mixture is transparent and bubble-free to obtain the air entraining agent FY-5 for the anti-freezing concrete in the high altitude area.
Example 6
(1) Synthesis of polycarboxylic acid air entraining agent: adding 2-acrylamide-2-methylpropanesulfonic acid and deionized water (the mass ratio of the two is 1:1.2) into a reaction kettle, stirring and heating to 65 ℃ to obtain a solution A; then adding ammonium persulfate into the solution A, respectively and simultaneously dropwise adding a deionized water mixed solution of N, N-dimethylacrylamide and sodium p-styrenesulfonate (the mass ratio of the N, N-dimethylacrylamide to the deionized water is 1.2: 1) and methoxy polyethylene glycol acrylate with the molecular weight of 600, wherein the dropwise adding time is 3.5h, after the dropwise adding is finished, continuing to perform heat preservation reaction at 60 ℃ for 1.0h, and then cooling to room temperature to obtain a solution B; finally, adding liquid caustic soda into the solution B, and adjusting the pH value to 6-7 to obtain a polycarboxylic acid air entraining agent; wherein the mass ratio of the 2-acrylamide-2-methylpropanesulfonic acid to the N, N-dimethylacrylamide to the sodium p-styrene sulfonate to the methoxy polyethylene glycol acrylate to the ammonium persulfate is 1:1.0:0.45:12.0: 0.2.
(2) Preparing an air entraining agent: at normal temperature, 60% of polycarboxylic acid air entraining agent is added into production equipment according to the mass ratio, 8% of sodium dodecyl sulfate is added under the condition that the rotating speed is 120rpm, and the mixture is stirred for 20-30 min; then adding 20% of fatty alcohol-polyoxyethylene ether sodium sulfate, and stirring for 15-20 min; sequentially adding 1% of dodecyl betaine, 3% of cocamidopropyl betaine, 2% of cocamidopropyl hydroxysultaine and 3% of cocamidopropyl amine oxide, and stirring for 15-20 min; and finally, adding 3% of modified silicone polyether microemulsion, and stirring until the mixture is transparent and bubble-free to obtain the air entraining agent FY-6 for the anti-freezing concrete in the high altitude area.
Comparative example: the novel polyether air entraining agent AE is a Japanese imported product.
And (3) verifying the implementation effect:
the performance test of the air entraining agent for the anti-freezing concrete in the high-altitude areas of the embodiments 1-6 and the novel polyether air entraining agent AE imported from Japan of the comparative example is carried out, and the test is carried out in a tunnel engineering laboratory on a Wuyi highway in Xinjiang, wherein the altitude is about 3000m and the atmospheric pressure is about 70 kPa.
The concrete mixing proportion is as follows: 360kg/m3 cement, 421kg/cm3 broken stone with the thickness of 5-10 mm and 631kg/cm broken stone with the thickness of 10-20 mm3794kg/cm of sand in zone II with fineness modulus of 2.63The water-gel ratio is 0.44, and the water reducing agent is 3.6kg/m30.36g/m of air entraining agent3. The test results are shown in Table 1.
TABLE 1 test results
As can be seen from Table 1, the air entraining agent prepared by the air entraining agents prepared in the embodiments 1 to 6 of the invention has obviously better air entraining property and air stability than the comparative example AE, the prepared concrete has slightly better fluidity and slump retention property, and the strength guarantee rate of more than 95 percent is also provided although the compressive strength of 7d and 28d is slightly lower than that of the comparative example AE.
The production equipment used in examples 1 to 6 were identical and all included:
a cylindrical body 1 which is cylindrical and hollow inside; the stirring shaft 2 is vertically arranged in the cylinder body; the stirring shaft 2 is connected to an output shaft of the motor, and the stirring shaft 2 is driven by the motor to rotate; a plurality of stirring blades 3 are distributed on the stirring shaft 2 at intervals; the bottom of the stirring shaft 2 is vertically connected with one end of a suction pipe 4, the suction pipe 4 is arc-shaped, and the other end of the suction pipe 4, which is far away from the stirring shaft 2, is in contact with the inner wall of the cylinder body 1 and does not abut against the inner wall; the section of the suction pipe 4 is triangular, one surface of the suction pipe is attached to the bottom of the inner wall of the cylinder 1, suction holes 5 are formed in the concave side of the suction pipe 4 at intervals, and the suction holes 5 are close to the bottom of the inner wall of the cylinder 1; the through hole is triangular, and the bottom of the through hole is attached to the bottom end of the suction pipe; the stirring shaft 2 and the suction pipe 4 are both hollow and communicated, and the stirring shaft 2 is connected with external air pumping equipment.
In the above embodiment, the stirring shaft 2 is driven by the motor to rotate, so as to drive the stirring blade 3 and the suction pipe 4 to rotate, the stirring blade 3 and the suction pipe 4 will stir and mix the liquid that is input at the same time, and when the liquid after mixing needs to be sucked out, the stirring shaft 2 is kept to rotate. Straw 4 will be at rotatory in-process will the liquid of 1 bottom of barrel is all concentrated and is scraped together, restarts exhaust equipment will scrape this liquid together and absorb away via suction hole 5, and this is because this air entraining agent is comparatively thick, adopts conventional straw, will unable whole absorption come out, can cause the waste of a large amount of products, and this straw 5 both can absorb the product of bottom in addition, can also stir, kills two birds with one stone.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (10)
1. The air entraining agent for the anti-freezing concrete in the high-altitude area is characterized by being prepared from the following components in percentage by mass: 10-25% of sodium fatty alcohol polyoxyethylene ether sulfate, 5-10% of sodium dodecyl sulfate, 1-5% of dodecyl betaine, 1-5% of cocamidopropyl hydroxysultaine, 1-5% of cocamidopropyl amine oxide, 1-5% of modified silicon resin polyether microemulsion and 50-70% of polycarboxylic acid air entraining agent.
2. The air entraining agent for the anti-freeze concrete in the high-altitude area according to claim 1, which is prepared from the following components in percentage by mass: 15-20% of sodium fatty alcohol polyoxyethylene ether sulfate, 8-10% of sodium dodecyl sulfate, 1-3% of dodecyl betaine, 1-3% of cocamidopropyl betaine, 2-4% of cocamidopropyl hydroxysulfobetaine, 1-3% of cocamidopropyl amine oxide, 1-3% of modified silicon resin polyether microemulsion and 60-65% of polycarboxylic acid air entraining agent.
3. A method for preparing the air-entraining agent for anti-freeze concrete for the high altitude area according to any one of claims 1 to 2, comprising the steps of:
1) at normal temperature, adding a polycarboxylic acid air entraining agent into production equipment according to the mass ratio, adding sodium dodecyl sulfate under the condition of the rotating speed of 120rpm, and stirring for 20-30 min;
2) adding sodium fatty alcohol-polyoxyethylene ether sulfate, and stirring for 15-20 min;
3) adding dodecyl betaine, cocamidopropyl hydroxysultaine, and cocamidopropyl amine oxide in sequence, and stirring for 15-20 min;
4) adding the modified silicon resin polyether microemulsion, and stirring until the mixture is transparent and bubble-free, thereby obtaining the target product, namely the air entraining agent for the anti-freezing concrete in the high-altitude area.
4. The air entraining agent for the anti-freeze concrete in the high-altitude area according to claim 3, wherein the polycarboxylic acid air entraining agent is prepared by the following method:
step A, adding 2-acrylamide-2-methylpropanesulfonic acid and deionized water into a reaction kettle according to the volume ratio, stirring and heating to obtain a solution A;
step B, adding ammonium persulfate into the solution A, respectively and simultaneously dropwise adding the deionized water mixed solution of N, N-dimethylacrylamide and sodium p-styrenesulfonate and methoxy polyethylene glycol acrylate, after dropwise adding, performing heat preservation reaction, and cooling to room temperature to obtain a solution B;
and step C, finally adding liquid caustic soda into the solution B, and adjusting the pH value to 6-7 to obtain the polycarboxylic acid air entraining agent.
5. The air entraining agent for the anti-freeze concrete in the high-altitude area as claimed in claim 4, wherein the mass ratio of the 2-acrylamide-2-methyl propane sulfonic acid, the N, N-dimethyl acrylamide, the sodium p-styrene sulfonate, the methoxy polyethylene glycol acrylate and the ammonium persulfate is 1 (0.5-1.0): 0.2-0.45): 7.0-12.0): 0.1-0.2.
6. The air entraining agent for anti-freeze concrete in high altitude areas as claimed in claim 3, wherein the molecular weight of the methoxypolyethylene glycol acrylate is 350-600.
7. The air entraining agent for the anti-freeze concrete in the high altitude area as claimed in claim 3, wherein in the step A, 2-acrylamido-2-methylpropanesulfonic acid and deionized water are added into a reaction kettle and stirred to raise the temperature to 55-65 ℃.
8. The air entraining agent for the anti-freeze concrete in the high altitude area as claimed in claim 3, wherein in the step B, the dropping time is 2.5-3.5h, the temperature of the heat preservation reaction is 55-65 ℃, and the reaction time is 1-1.5 h.
9. The air entraining agent for anti-freeze concrete for high altitude areas according to claim 3, wherein the production equipment comprises:
a cylindrical body having a hollow interior;
the stirring shaft is vertically arranged in the cylinder body; the stirring shaft is connected to an output shaft of the motor, and is driven by the motor to rotate;
a plurality of stirring blades are distributed on the stirring shaft at intervals; the bottom of the stirring shaft is vertically connected with one end of a suction pipe, the suction pipe is arc-shaped, and the other end of the suction pipe, which is far away from the stirring shaft, is in contact with the inner wall of the cylinder body and does not abut against the inner wall of the cylinder body; the section of the suction pipe is triangular, one surface of the suction pipe is attached to the bottom of the inner wall of the cylinder, suction holes are formed in the concave side of the suction pipe at intervals, and the suction holes are close to the bottom of the inner wall of the cylinder;
the stirring shaft and the suction pipe are both hollow and communicated, and the stirring shaft is connected with external air pumping equipment.
10. The air entraining agent for anti-freeze concrete in high altitude areas according to claim 9, wherein the through holes are triangular and the bottom thereof is attached to the bottom end of the suction pipe.
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