CN113773747B - Fair-faced concrete protective agent with lotus leaf effect and preparation method and application thereof - Google Patents
Fair-faced concrete protective agent with lotus leaf effect and preparation method and application thereof Download PDFInfo
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- CN113773747B CN113773747B CN202111159244.0A CN202111159244A CN113773747B CN 113773747 B CN113773747 B CN 113773747B CN 202111159244 A CN202111159244 A CN 202111159244A CN 113773747 B CN113773747 B CN 113773747B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
- C09D1/02—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances alkali metal silicates
- C09D1/04—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances alkali metal silicates with organic additives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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Abstract
The invention provides a bare concrete protective agent with lotus leaf effect, a preparation method and application thereof, wherein the bare concrete protective agent comprises a component A and a component B; the component A comprises a combination of aqueous reactive silicone emulsion and potassium silicate colloid stabilizer in specific parts, and the component B comprises a combination of potassium silicate colloid solution and potassium silicate colloid stabilizer in specific parts; the component A mainly comprising the water-based reactive organosilicon emulsion is matched with the component B mainly comprising the potassium silicate colloidal solution, so that the bare concrete protective agent can be distributed on the surface of the concrete and in capillaries after being applied to the surface of the bare concrete, and the reactive organosilicon, the potassium silicate and the concrete in the protective agent are mutually polymerized under the strong alkali environment, so that the bare concrete has the effects of aging resistance, high permeability, high filling and lotus leaf water repellency.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to a bare concrete protective agent with a lotus leaf effect, and a preparation method and application thereof.
Background
At present, the quantity of bridges and tunnels in China is huge, the bridges and tunnels are also increased at a high speed every year, the national maintenance cost for the bridge and the tunnel is high, and the market has huge protection demand on the fair-faced concrete. The fair-faced concrete is a decorative concrete, is a surface which is naturally formed by cast-in-place concrete and has a flat and smooth surface, uniform color and clear edges and corners and is directly used as a decorative surface, belongs to one-step casting molding, does not need any appearance decoration, only coats a transparent protective agent on the surface, and has a preparation process and cost which are higher than those of common concrete, so that the fair-faced concrete is different from common concrete and has a decorative effect. However, since concrete is formed by mixing cement, aggregate and a part of additives and then casting, if the concrete is exposed to severe environments such as air pollution, ultraviolet rays, acid rain, and the like for a long time, the surface of the concrete is carbonized and corroded by chloride, and then cracks are generated, thereby affecting the appearance quality and durability, and therefore, the durability of the concrete is generally improved by adopting a method of later repair and coating of a protective agent.
The protective agent for the fair-faced concrete at present mainly comprises a synthetic acrylic emulsion protective agent, a reactive organic silicon protective agent, a reactive inorganic silicon protective agent and the like. CN111018562A discloses an as-cast finish concrete protective agent and a preparation method thereof, wherein the as-cast finish concrete protective agent comprises the following components in parts by weight: fluorocarbon resin emulsion: 450-500 parts of a silane modifier: 20-25 parts of a photocatalyst: 30-45 parts of matting powder: 25-30 parts of a thickening agent: 20-30 parts of a defoaming agent: 1-2 parts of wetting agent: 2-3 parts of a dispersant: 10-15 parts of a cosolvent: 60-80 parts of a film forming additive: 20-30 parts of water and a proper amount of water. After the bare concrete protective agent disclosed by the invention is used, the corrosion resistance, impermeability, waterproofness, weather resistance and self-cleaning capability of the bare concrete are obviously improved. CN108947582A discloses an fair-faced concrete surface protective agent with a graffiti-preventing function and a using method thereof, wherein the protective agent consists of A, B components, wherein the A component is a mixed aqueous solution of fluosilicate, calcium silicate hydrate gel powder, cellulose ether, a polycarboxylic acid water reducing agent and a polyether modified silicon defoaming agent; the component B consists of modified nanometer silica sol and curing agent. The bare concrete protective agent with the scrawling prevention function, which is prepared by the invention, not only can meet the conventional requirements on the bare concrete protective agent, but also has a good scrawling prevention function; the anti-doodling layer formed after treatment has stronger resistance and better durability to destructive influence of internal and external adverse factors of the fair-faced concrete, and has strong adhesive force on the surface of the fair-faced concrete, is not easy to damage and bubble. CN108485400A discloses a bare concrete protective agent, which is prepared by weighing the following components in parts by weight: 80-120 parts of polyvinylidene fluoride emulsion, 10-12 parts of film forming auxiliary agent, 2-4 parts of wetting agent, 5-10 parts of cosolvent, 8-12 parts of zinc polyacrylate, 3-6 parts of dispersing agent, 15-22 parts of modifying additive, 18-24 parts of reinforcing auxiliary agent and 50-90 parts of water, mixing the polyvinylidene fluoride emulsion with the wetting agent, sequentially adding the cosolvent, the zinc polyacrylate and the dispersing agent, stirring and mixing to obtain No. 1 blank, mixing the modifying additive with the reinforcing auxiliary agent, adding the water and the film forming auxiliary agent, stirring and mixing to obtain No. 2 blank, and stirring and mixing the No. 1 blank with the No. 2 blank to obtain the fair-faced concrete protective agent. The bare concrete protective agent has the characteristics of reducing the corrosion of temperature, air and water to products, and improving the protective performance of bare concrete.
The protective agent and other reactive organosilicon protective agents in the prior art have good water repellency with lotus leaf effect; however, a layer of hydrophobic film can be formed only on the wall of the concrete capillary and the surface of the concrete, and the concrete capillary is hardly filled, so that the water permeability is high after long-term water immersion, and the concrete is not well protected for long-term under-liquid-level, liquid-level junction or long-term high-humidity environment; the other reactive inorganic silicon protective agent has good weather resistance, acid and alkali resistance and strong permeability, and reacts with the concrete to play a role in reinforcing the concrete, so that the surface of the concrete is more compact, the effect of protecting the concrete is achieved, and the water permeability is also poor.
Therefore, the development of the fair-faced concrete protective agent with high permeability, high filling and lotus leaf water repellency is a technical problem which needs to be solved urgently in the field.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the fair-faced concrete protective agent with the lotus leaf effect and the preparation method and the application thereof, wherein the fair-faced concrete protective agent comprises a component A and a component B; the component A comprises a combination of aqueous reactive silicone emulsion and potassium silicate colloid stabilizer in a specific part; the component B comprises a combination of potassium silicate colloidal solution and potassium silicate colloidal stabilizer in specific parts; the bare concrete protective agent has the effects of aging resistance, high permeability, high filling and lotus leaf water repellency.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides an fair-faced concrete protective agent with a lotus leaf effect, which comprises a component A and a component B;
the component A comprises the following components in parts by weight: 20-40 parts of water-based reactive organosilicon emulsion and 0.5-1 part of potassium silicate colloid stabilizer;
the component B comprises the following components in parts by weight: 20 to 40 parts by weight of a potassium silicate colloidal solution and 0.5 to 1.5 parts by weight of a potassium silicate colloidal stabilizer.
The aqueous reactive silicone emulsion can be 22 parts by weight, 24 parts by weight, 26 parts by weight, 28 parts by weight, 30 parts by weight, 32 parts by weight, 34 parts by weight, 36 parts by weight, 38 parts by weight, or the like.
The potassium silicate colloid stabilizer in the a component may be 0.55 parts by weight, 0.6 parts by weight, 0.65 parts by weight, 0.7 parts by weight, 0.75 parts by weight, 0.8 parts by weight, 0.85 parts by weight, 0.9 parts by weight, or 0.95 parts by weight, etc.
The potassium silicate colloid stabilizer in the B component may be 0.65 parts by weight, 0.8 parts by weight, 0.95 parts by weight, 1.05 parts by weight, 1.1 parts by weight, 1.15 parts by weight, 1.2 parts by weight, 1.25 parts by weight, 1.3 parts by weight, 1.35 parts by weight, 1.4 parts by weight, 1.45 parts by weight, or the like.
The potassium silicate colloidal solution may be 22 parts by weight, 24 parts by weight, 26 parts by weight, 28 parts by weight, 30 parts by weight, 32 parts by weight, 34 parts by weight, 36 parts by weight, 38 parts by weight, or the like.
The fair-faced concrete protective agent provided by the invention comprises a component A and a component B, wherein the component A comprises a combination of aqueous reaction type organic silicon emulsion and a potassium silicate colloid stabilizer in specific parts, the aqueous reaction type organic silicon emulsion can be hydrolyzed into organic polyol with a hydrophobic chain under an alkaline condition, the organic polyol can be self-condensed into an organic silicon polymer with a hydrophobic chain as a branched chain and a silicon-oxygen bond as a main chain under an alkaline environment, and simultaneously the organic polyol can be condensed with the main component of the silicon polyol in the fair-faced concrete, so that a coating film formed by the protective agent becomes a part of the concrete, the protection effect on the concrete is further enhanced, and the protective agent has excellent adhesive force, durability, weather resistance and hydrophobicity on the surface of the concrete.
The bare concrete protective agent provided by the invention comprises a component A and a component B, wherein the component B comprises a combination of potassium silicate colloidal solution and potassium silicate colloidal stabilizer in specific parts, the potassium silicate colloidal solution is a pure inorganic substance, and can be self-condensed into a high-molecular inorganic polymer due to the silanol functional group, the high-molecular inorganic polymer can provide excellent weather resistance of a coating film, and after being mixed with the aqueous reaction type organic silicon emulsion in the component A, the potassium silicate colloidal solution and the aqueous reaction type organic silicon emulsion can be condensed into an organic-inorganic hybrid high-molecular polymer, and the organic-inorganic hybrid high-molecular polymer can also be condensed with concrete, so that the protective agent and the concrete are firmly and chemically combined; the potassium silicate colloidal solution can also play a role in filling capillary pores after entering the capillary pores of the concrete, so that the surface of the obtained concrete is more compact, and further, the infiltration of air and water vapor can be effectively prevented, and the function of protecting the concrete is played.
The fair-faced concrete protective agent provided by the invention comprises a component A and a component B, wherein both the component A and the component B also comprise potassium silicate colloid stabilizers in specific parts, and the potassium silicate colloid stabilizers can improve the compatibility of the component A and the component B and can prolong the construction time of the protective agent.
In summary, the protective agent comprising the component A mainly comprising the water-based reactive silicone emulsion and the component B mainly comprising the potassium silicate colloidal solution can be distributed on the surface of the fair-faced concrete when being constructed on the surface of the fair-faced concrete
After water in the protective agent is volatilized in a capillary tube, the reactive organosilicon, the potassium silicate and the concrete in the protective agent are polymerized mutually in a strong alkali environment to form a high polymer coating film with a hydrophobic branched chain, and the coating film is connected with the concrete through a chemical bond, so that the whole concrete surface has high weather resistance and strong dutchness hydrophobic effect, and the effects of protecting the concrete and prolonging the service life of the concrete are achieved; in addition, the coating film also has the characteristic of low gloss, so that the original color of concrete can be maintained.
The fair-faced concrete protective agent with the lotus leaf effect has the advantages that a protective agent coating film on the surface of the fair-faced concrete has extremely high hydrophobicity, water sprayed on the surface of the coating film can automatically gather into water drops, and dust and sludge falling on the surface of the coating film are stuck and rolled out of the surface of the fair-faced concrete by the rolling of the water drops.
In the present invention, the aqueous reactive silicone emulsion may be SILRES BS4004 available from Wacker corporation; the potassium silicate colloidal solution can be selected from ark100 of Australian chemical Co.Ltd in Shanghai; the potassium silicate colloid stabilizer can be selected from CS1 of Australian chemical Co., Ltd.
Preferably, the mass ratio of the component A to the component B is 1 (0.25-0.75), such as 1:0.3, 1:0.35, 1:0.4, 1:0.45, 1:0.5, 1:0.55, 1:0.6, 1:0.65 or 1: 0.7.
As a preferred technical scheme, when the mass ratio of the component A to the component B is 1 (0.25-0.75), the fair-faced concrete protective agent with excellent comprehensive performance can be obtained, on one hand, if the using amount of the component A is too high, the water permeability is reduced, and resources are wasted; on the other hand, if the amount of the A component is too low, a decrease in hydrophobicity and a decrease in water permeability may result.
Preferably, the molecular weight of the aqueous reactive silicone emulsion is 200-500, such as 230, 260, 290, 330, 360, 390, 430, 460 or 490.
Preferably, each of the a-component and the B-component independently further comprises a preservative and/or deionized water.
Preferably, the preservative is present in the a component in an amount of 0.1 to 0.3 parts by weight, such as 0.12 parts by weight, 0.14 parts by weight, 0.16 parts by weight, 0.18 parts by weight, 0.2 parts by weight, 0.22 parts by weight, 0.24 parts by weight, 0.26 parts by weight, or 0.28 parts by weight, and the like.
Preferably, the deionized water is contained in the component A in an amount of 58.7 to 79.4 parts by weight, for example, 59 parts by weight, 61 parts by weight, 63 parts by weight, 65 parts by weight, 67 parts by weight, 69 parts by weight, 71 parts by weight, 73 parts by weight, 75 parts by weight, 77 parts by weight, or the like.
Preferably, the preservative is contained in the B component in an amount of 0.2 to 0.5 parts by weight, such as 0.23 parts by weight, 0.27 parts by weight, 0.3 parts by weight, 0.33 parts by weight, 0.36 parts by weight, 0.39 parts by weight, 0.42 parts by weight, 0.45 parts by weight, or 0.48 parts by weight.
Preferably, the deionized water content in the component B is 58-78.8 parts by weight, such as 60 parts by weight, 62 parts by weight, 64 parts by weight, 66 parts by weight, 68 parts by weight, 70 parts by weight, 72 parts by weight, 74 parts by weight, 76 parts by weight or 78 parts by weight.
Preferably, the preservative comprises 1,2 benzisothiazolin-3-one and/or 2-methyl-4 isothiazolin-3-one.
In a second aspect, the present invention provides a method for preparing the bare concrete protective agent according to the first aspect, wherein the method comprises the following steps:
(1) mixing the reactive silicone emulsion, a potassium silicate colloidal stabilizer, optionally deionized water, and optionally a preservative to obtain a component A; mixing a potassium silicate colloidal solution, a potassium silicate colloidal stabilizer, optionally deionized water, and optionally a preservative to obtain a B-component;
(2) and mixing the component A and the component B to obtain the bare concrete protective agent.
Preferably, the mixing in step (1) is carried out under stirring conditions, preferably at a rotation speed of 150 to 300r/min (e.g. 170r/min, 190r/min, 210r/min, 230r/min, 250r/min, 270r/min or 290 r/min).
Preferably, the mixing time in step (1) is 5-10 min, such as 5.5min, 6min, 6.5min, 7min, 7.5min, 8min, 8.5min, 9min or 9.5 min.
In a second aspect, the invention provides a construction method of a bare concrete protective agent, which comprises the following steps: and (3) coating the bare concrete protective agent on the surface of the bare concrete to finish the construction of the bare concrete protective agent.
Preferably, the coating time is 0-2 h and is not equal to 0, such as 0.2h, 0.4h, 0.6h, 0.8h, 1h, 1.2h, 1.4h, 1.6h or 1.8 h.
Compared with the prior art, the invention has the following beneficial effects:
the fair-faced concrete protective agent with the lotus leaf effect comprises a component A and a component B, wherein the component A comprises a combination of aqueous reaction type organic silicon emulsion and a potassium silicate colloidal stabilizer in specific parts, the component B comprises a combination of a potassium silicate colloidal solution and a potassium silicate colloidal stabilizer, the component A mainly comprising the aqueous reaction type organic silicon emulsion is selected to be matched with the component B mainly comprising the potassium silicate colloidal solution, and the potassium silicate colloidal stabilizer is added in a matching manner, so that the obtained protective agent can be distributed on the surface of concrete and in capillaries when the protective agent is constructed on the surface of fair-faced concrete; after the moisture in the protective agent is volatilized, the reactive organosilicon, the potassium silicate and the concrete in the film-formed protective agent are mutually polymerized in a strong alkali environment to form a high-molecular polymer coating film with a hydrophobic branched chain, and the coating film is connected with the concrete through a chemical bond, so that the whole concrete surface has high weather resistance and a strong lotus leaf hydrophobic effect, the effects of protecting the concrete and prolonging the service life of the concrete are achieved, and the coating film also has low gloss, and the original color of the concrete can be kept.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
An fair-faced concrete protective agent with a lotus leaf effect comprises a component A and a component B, wherein the component A and the component B are in a mass ratio of 1: 0.5;
the component A comprises the following components in parts by weight:
the component B comprises the following components in parts by weight:
the preparation method of the bare concrete protective agent provided by the embodiment comprises the following steps:
(1) mixing water-based reactive organosilicon emulsion (Wake corporation, SILRES BS 4004), potassium silicate colloid stabilizer (Shanghai Aolun chemical Co., Ltd., CS1), deionized water and 1, 2-benzisothiazolin-3-one to obtain component A; mixing potassium silicate colloidal solution (Shanghai Australian chemical Co., Ltd., ark100), potassium silicate colloidal stabilizer (Shanghai Australian chemical Co., Ltd., CS1), ionized water and 1, 2-benzisothiazolin-3-one to obtain component B;
(2) and mixing the component A and the component B for 5min under the stirring condition at the rotating speed of 150r/min to obtain the bare concrete protective agent.
Example 2
An fair-faced concrete protective agent with a lotus leaf effect comprises a component A and a component B in a mass ratio of 1: 0.25;
the component A comprises the following components in parts by weight:
the component B comprises the following components in parts by weight:
the preparation method of the bare concrete protective agent provided by the embodiment comprises the following steps:
(1) mixing water-based reactive organosilicon emulsion (Wake corporation, SILRES BS 4004), potassium silicate colloid stabilizer (Shanghai Australian chemical Co., Ltd., CS1), deionized water and 1, 2-benzisothiazolin-3-one to obtain component A; mixing potassium silicate colloidal solution (Shanghai Australian chemical Co., Ltd., ark100), potassium silicate colloidal stabilizer (Shanghai Australian chemical Co., Ltd., CS1), ionized water and 1, 2-benzisothiazolin-3-one to obtain component B;
(2) and mixing the component A and the component B for 5min under the stirring condition at the rotating speed of 150r/min to obtain the bare concrete protective agent.
Example 3
An fair-faced concrete protective agent with a lotus leaf effect comprises a component A and a component B in a mass ratio of 1: 0.75;
the component A comprises the following components in parts by weight:
the component B comprises the following components in parts by weight:
the preparation method of the bare concrete protective agent provided by the embodiment comprises the following steps:
(1) mixing water-based reactive organosilicon emulsion (Wake corporation, SILRES BS 4004), potassium silicate colloid stabilizer (Shanghai Australian chemical Co., Ltd., CS1), deionized water and 1, 2-benzisothiazolin-3-one to obtain component A; mixing potassium silicate colloidal solution (Shanghai Australian chemical Co., Ltd., ark100), potassium silicate colloidal stabilizer (Shanghai Australian chemical Co., Ltd., CS1), ionized water and 1, 2-benzisothiazolin-3-one to obtain component B;
(2) and mixing the component A and the component B for 5min under the stirring condition at the rotating speed of 150r/min to obtain the bare concrete protective agent.
Comparative example 1
An as-cast finish concrete protective agent with a lotus leaf effect is different from the agent in the embodiment 1 only in that the agent is completely composed of the component A, the component B is not added, and other components, the using amount and the preparation method are the same as those in the embodiment 1.
Comparative example 2
An as-cast finish concrete protective agent with a lotus leaf effect is different from the agent in the embodiment 1 only in that the agent is completely composed of a component B, a component A is not added, and other components, the using amount and the preparation method are the same as those in the embodiment 1.
Comparative example 3
An fair-faced concrete protective agent with a lotus leaf effect comprises a component A and a component B in a mass ratio of 1: 0.5;
the component A comprises the following components in parts by weight:
21 parts by weight of aqueous reaction type organic silicon emulsion
0.3 part by weight of preservative
78.2 parts by weight of deionized water;
the component B and the preparation method are the same as in example 1.
Comparative example 4
An fair-faced concrete protective agent with a lotus leaf effect comprises a component A and a component B in a mass ratio of 1: 0.5;
the component B comprises the following components in parts by weight:
potassium silicate colloidal solution 22.1 parts by weight
77.1 parts by weight of deionized water
0.3 part by weight of preservative;
the component A and the preparation method are the same as in example 1.
Comparative example 5
A blank test board, a water permeability test board, without any substance;
the preparation process of the blank test plate comprises the following steps: the asbestos-free fiber cement pressurized Ete board special for standard building coating test is selected.
And (3) performance testing:
(1) water permeability: testing according to a water permeability testing method in standard GH/T9755-2014 synthetic resin emulsion exterior wall paint;
(2) weather resistance (artificial aging): the artificial accelerated aging test is carried out according to the test method in GB/T1865-2009 xenon arc radiation for artificial accelerated aging and artificial radiation exposure filtration of colored paint and varnish, and the evaluation standard is set to be that the water permeability and the contact angle are not changed before and after the test and no chromatic aberration is generated before and after the test.
(3) Contact angle: the determination is carried out according to GB/T30447 and 2013' method for measuring contact angle of nano film
The bare concrete protective agents provided in examples 1 to 3 and comparative examples 1 to 5 were tested according to the test method, and the test results are shown in table 1:
TABLE 1
| Water permeability | Weather resistance (h) | Contact angle (°) | |
| Example 1 | 0.7 | ＞1000 | 150 |
| Example 2 | 0.6 | ＞1000 | 150 |
| Example 3 | 0.5 | ＞1000 | 150 |
| Comparative example 1 | 1.4 | ＞1000 | 150 |
| Comparative example 2 | 2.8 | ＞1000 | 0 |
| Comparative example 3 | 0.8 | ＞1000 | 150 |
| Comparative example 4 | 0.8 | ＞1000 | 150 |
| Comparative example 5 | ＞4 | / | 0 |
As can be seen from the data in table 1:
the fair-faced concrete protective agent with the lotus leaf effect provided by the invention has an excellent waterproof effect, and can effectively reduce the water permeability of concrete.
Specifically, the water permeability of the bare concrete protective agent provided by the embodiments 1 to 3 is 0.5 to 0.7, the weather resistance test is more than 1000h, and the contact angle can reach 150 °.
Comparing example 1 with comparative examples 1-2, it can be found that the protective agent obtained by singly adopting the component A has small reduction on the water permeability; the protective agent obtained by singly adopting the component B not only has small reduction on water permeability, but also has lower contact angle.
Comparing example 1 with comparative examples 3 to 4, it can be seen that the water permeability of the fair-faced concrete protectant obtained without adding the potassium silicate colloidal stabilizer is improved.
Comparative example 5 is a concrete without any protecting agent, and it can be seen that the water permeability is high, indicating that the water-repellent effect itself is poor.
In conclusion, only the protective agent obtained by mixing the component A and the component B has low water permeability, high weather resistance and strong hydrophobicity.
The applicant states that the invention is illustrated by the above examples to provide a dry concrete protectant with lotus leaf effect and its preparation and use, but the invention is not limited to the above examples, i.e. it does not mean that the invention must be implemented by the above examples. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (9)
1. The fair-faced concrete protective agent with the lotus leaf effect is characterized by comprising a component A and a component B;
the component A comprises the following components in parts by weight: 20-40 parts of aqueous reactive organosilicon emulsion, 0.5-1 part of potassium silicate colloid stabilizer, 0.1-0.3 part of preservative and 58.7-79.4 parts of deionized water; the water-based reactive organosilicon emulsion can be hydrolyzed into organic polyol with a hydrophobic chain under an alkaline condition, the organic polyol can be self-condensed into an organosilicon polymer with a branched chain being a hydrophobic chain and a main chain only containing silicon-oxygen bonds under an alkaline environment, and the organic polyol is condensed with the main component of the silanol in the fair-faced concrete;
the component B comprises the following components in parts by weight: 20-40 parts of potassium silicate colloidal solution, 0.5-1.5 parts of potassium silicate colloidal stabilizer, 0.2-0.5 part of preservative and 58.7-79.4 parts of deionized water;
the mass ratio of the component A to the component B is 1 (0.25-0.75).
2. The fair-faced concrete protectant according to claim 1, wherein the molecular weight of the aqueous reactive silicone emulsion is 200-500.
3. The bare concrete protectant according to claim 1, wherein the preservative comprises 1,2 benzisothiazolin-3-one and/or 2-methyl-4 isothiazolin-3-one.
4. A method for preparing the bare concrete protectant according to claim 1, comprising the steps of:
(1) mixing aqueous reaction type organic silicon emulsion, potassium silicate colloid stabilizer, deionized water and preservative to obtain a component A; mixing the potassium silicate colloidal solution, the potassium silicate colloidal stabilizer, deionized water and the preservative to obtain a component B;
(2) and mixing the component A and the component B to obtain the bare concrete protective agent.
5. The method for preparing as-cast finish concrete protectant according to claim 4, wherein the mixing in step (1) is performed under stirring.
6. The preparation method of the bare concrete protective agent according to claim 5, wherein the mixing in the step (1) is carried out under the stirring condition with the rotating speed of 150-300 r/min.
7. The preparation method of the bare concrete protective agent according to claim 4, wherein the mixing time in the step (1) is 5-10 min.
8. A construction method of the bare concrete protective agent is characterized by comprising the following steps: the bare concrete protective agent as claimed in claim 1 is coated on the surface of the bare concrete, and the construction of the bare concrete protective agent is completed.
9. The construction method of the bare concrete protective agent according to claim 8, wherein the coating time is 0-2 h and is not equal to 0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111159244.0A CN113773747B (en) | 2021-09-30 | 2021-09-30 | Fair-faced concrete protective agent with lotus leaf effect and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111159244.0A CN113773747B (en) | 2021-09-30 | 2021-09-30 | Fair-faced concrete protective agent with lotus leaf effect and preparation method and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113773747A CN113773747A (en) | 2021-12-10 |
| CN113773747B true CN113773747B (en) | 2022-09-16 |
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