CN110776801A - Preparation method of concrete corrosion-resistant waterproof coating - Google Patents
Preparation method of concrete corrosion-resistant waterproof coating Download PDFInfo
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- C09D151/00—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
- C09D151/08—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers grafted on to macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/006—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polymers provided for in C08G18/00
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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Abstract
The invention belongs to the technical field of waterproof paint, in particular to a preparation method of concrete corrosion-resistant waterproof paint, which takes water as solvent, has high strength, high wear resistance, impact resistance and corrosion resistance, is used for the concrete surface with excellent waterproof and seepage-proof performance, is used on the upstream surface, does not contain tar, asphalt and solvent, is nontoxic and pollution-free, can be used for drinking water engineering, has high tensile strength, large elongation, strong base layer deformation resistance, high bonding strength, wear resistance, sand and other medium impact resistance, chemical medium corrosion resistance, aging resistance and good high and low temperature resistance, can form a waterproof coating film at normal temperature after being coated, is adhered to a base layer, can not generate coating peeling, can not foam to lose strength, extensibility and elasticity, and solves the problem of waterproof construction on a damp concrete base surface.
Description
Technical Field
The invention belongs to the technical field of waterproof coatings, and particularly relates to a preparation method of a concrete corrosion-resistant waterproof coating.
Background
Nowadays, the polyurethane coating is called 'liquid rubber', is one of the waterproof coatings with the best comprehensive performance at present, and can be used for waterproofing and seepage-proofing of parts soaked for a long time. In terms of product variety and performance, most enterprises mainly produce the bi-component polyurethane waterproof coating at the beginning of the century, and only a few enterprises produce the single-component polyurethane waterproof coating, but in recent years, the enterprises producing the single-component products are increasing, and many enterprises can also produce the single-component and bi (multi) -component polyurethane waterproof coatings according to engineering requirements. In the product application field, the polyurethane waterproof coating is only originally used for waterproofing roofs, kitchens, toilets and the like, and is widely applied to waterproofing of underground engineering, high-speed rails, urban rail transit, bridges and other engineering. In addition, through the development of recent years, the environmental protection performance of the polyurethane waterproof coating is also greatly improved. As introduced by the industry, polyurethane waterproof coatings produced in early stage of China are all modified by tar, and the production and construction processes seriously harm the health of people. The national directive forbids the production of tar modified polyurethane waterproof paint in 1999. Polyurethane waterproofing coatings and polymer cement-based waterproofing coatings are the two most commonly used waterproofing materials in the construction field. However, the price of the polyurethane waterproof coating is higher, and the cost of the polyurethane waterproof coating is higher because the waterproof layer thickness of the polyurethane waterproof coating is required to be a little thicker than that of the polymer cement-based waterproof coating and the material consumption is naturally larger. In China, the price of raw materials used by the polyurethane waterproof coating is greatly higher than that of other products, so that the market share is influenced. Currently, the very hot single-component polyurethane waterproof coating (and single-component polyurethane paint) is called a product which can be coated by hands because of the convenient construction and simple operation. However, compared with the double-component polyurethane waterproof coating, because the single component does not participate in the B component with lower price and the packaging requirement is high, the price is generally much higher than that of the double component, and the double-component polyurethane waterproof coating is not in accordance with the economic strength of most regions in China and is difficult to be widely accepted. Those skilled in the art are keenly looking to develop corrosion and water resistant coatings for concrete to meet higher performance requirements and greater market demand.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a concrete corrosion-resistant waterproof coating and a preparation method thereof aiming at the defects in the prior art, and a paint film can be formed on the surface of concrete. The film has strong compactness, uniform distribution and strong binding capacity, and has low cost, and the obvious defects of water resistance, easy pollution and the like of the concrete surface are overcome.
The invention is realized by the following technical scheme:
the technical scheme adopted by the invention for solving the problems is as follows:
a preparation method of a concrete corrosion-resistant waterproof coating comprises the following steps:
(1) preparing grafted vinyl ester resin modified nitrile rubber:
weighing 23-31 parts by weight of polyoxypropylene triol, drying at 70-80 ℃ under 500-666.6 Pa for 12-24 h, and then drying by using 4 x 10
-10Soaking a m molecular sieve for 24-48 h, uniformly dispersing 2.2-3.5 parts of 3, 3 '-dichloro-4, 4' -diphenylmethane diamine into dried polyoxypropylene trihydric alcohol, heating to 90-100 ℃, weighing 15-18 parts of nitrile rubber, uniformly stirring, slowly adding 12-13 parts of graft modified vinyl ester resin while stirring, heating to 105-110 ℃, refluxing and preserving heat for 30-40 minutes, and cooling to room temperature to obtain graft vinyl ester resin modified nitrile rubber A;
(2) preparing modified polyurethane emulsion: adding 12-14 parts of calcium ricinoleate into a reaction kettle with a thermometer, a stirring device and a gas guide tube, introducing nitrogen trickle, dehydrating for 1h at 70-80 ℃ under reduced pressure, cooling to room temperature, sequentially adding 24-27 parts of toluene diisocyanate, 13-15 parts of diethylene glycol, 1-2 parts of a chain extender and 1-3 parts of tartaric acid subjected to drying treatment, heating to 50-55 ℃, carrying out heat preservation reaction for 3h, cooling to room temperature, dropwise adding 3-4 parts of a prepared triethylamine aqueous solution with the mass fraction of 1%, stopping dropwise adding 1-2 parts of the triethylamine aqueous solution when the pH value of the solution is adjusted to 7-8 under vigorous stirring, and continuing to vigorously stir for 10min to obtain uniformly dispersed white emulsion to obtain modified polyurethane emulsion;
(3) preparation of polyurethane paste: adding 55-60 parts of the modified polyurethane emulsion obtained in the step (2) and 1.1-1.3 parts of sodium dodecyl sulfate into a four-neck flask, quickly stirring and emulsifying for 0.5h, dropwise adding a mixed solution consisting of 10-12 parts of methyl methacrylate, 5-8 parts of butyl acrylate and 2.3-4 parts of acrylic acid at 80 ℃ and 2.3-4.1 parts of acrylamide, dropwise adding 0.05-0.1 part of potassium persulfate, finishing dropwise adding within 2-3 h, carrying out heat preservation reaction for 2h at 80 ℃, cooling and discharging to obtain a polyurethane paste B;
(4) the preparation of the concrete corrosion-resistant waterproof coating comprises the following steps:
respectively weighing 50-60 parts of the grafted vinyl ester resin modified nitrile rubber A, 40-50 parts of polyurethane paste B and 10-15 parts of ethanol in parts by weight, respectively adding the materials into a reaction kettle in the sequence of B → ethanol → A, fully and uniformly stirring, then adding magnesium oxide accounting for 0.3 percent of the total weight, and uniformly stirring to obtain the concrete corrosion-resistant waterproof coating.
According to the scheme, the nitrile rubber is carboxyl-terminated liquid nitrile rubber, the carboxyl content is 0.045-0.057%, and the acrylonitrile content is 18-26%.
According to the scheme, the cross-linking agent is one of triethylene diamine, stannous octoate and zinc naphthenate.
According to the scheme, the preparation method of the graft modified vinyl ester resin comprises the following steps: adding 66-75 parts of bisphenol A and 65-77 parts of dimethylbenzene solvent into a reaction kettle, slowly adding 100-130 parts of 16 mass percent sodium hydroxide solution after dissolving, then dropwise adding 25-33 parts of chloroethanol, controlling the reaction temperature to be 95-100 ℃, then adding 22-33 parts of maleic anhydride, 13-15 parts of methacrylic acid, 0.05-0.1 part of dibutyltin maleate and 13-16 parts of styrene, protecting with nitrogen, keeping the reaction temperature to be 150-160 ℃, then adding 13-24 parts of polyoxypropylene monohydric alcohol and 15-22 parts of 2, 4-toluene diisocyanate, uniformly mixing at the temperature of 65-70 ℃, heating to 165-180 ℃, stirring for reaction for 0.5-1 h, and evaporating the solvent to obtain the polyoxypropylene graft modified vinyl ester resin.
According to the scheme, the chain extender is polyoxyethylene polyamine or polyoxypropylene polyamine.
The invention has the beneficial effects that:
the invention utilizes the modification treatment of polyurethane and grafted vinyl ester resin modified nitrile rubber to form interpenetrating networks, so that the performance of the interpenetrating networks is improved to different degrees compared with that of single resin. The corrosion-resistant waterproof coating for the concrete disclosed by the invention has better alkali resistance and permeability, can fully infiltrate a wall surface base layer, enables the base layer to be compact, improves the interface adhesive force of a smooth base layer, endows the coating with excellent characteristics of high adhesive strength and corrosion resistance by the components of the nitrile rubber and the vinyl ester, is willing to ensure that cement napping is firm and reliable, and improves the adhesive strength of putty or plastering mortar and the wall surface base layer. The coating has the advantages that hollowing and cracking of the leveling layer are effectively prevented, the construction quality is improved, the coating is suitable for interface treatment of a base layer before putty scraping or plastering of concrete, aerated concrete and brick-concrete wall surfaces, and has good thermal stability and excellent ultraviolet resistance, a protective film can not crack or crack under sunlight, the coating has better impact resistance due to the introduction of rubber components, and the characteristics of high elasticity of organic materials, good durability of inorganic materials and the like are integrated. After coating, an elastic waterproof coating layer can be formed, and the waterproof coating has the advantages of simple and convenient construction, preparation of color coating according to requirements and the like.
Compared with the prior art, the invention has the following advantages:
the concrete corrosion-resistant waterproof coating disclosed by the invention is environment-friendly and safe, convenient to construct, wide in application range and obviously superior to construction of complex parts. After curing, a seamless and complete elastic waterproof layer is formed, the waterproof and anti-permeability capability of the building engineering is improved, and the coating film has high strength and extensibility and strong adaptability to cracking or stretching of a base layer. The maintenance is simple and convenient, only the local maintenance of the damaged part is needed, and the original waterproof effect can be still achieved.
Detailed Description
The invention is illustrated by the following specific examples, which are not intended to be limiting.
Example 1
A preparation method of a concrete corrosion-resistant waterproof coating comprises the following steps:
(1) preparing grafted vinyl ester resin modified nitrile rubber:
weighing 31 parts of polyoxypropylene triol, drying at 80 ℃ under the vacuum of 666.6Pa for 12h, and then drying by using 4X 10
-10Soaking a molecular sieve m for 24 hours, uniformly dispersing 2.2 parts of 3, 3 '-dichloro-4, 4' -diphenylmethane diamine into dried polyoxypropylene trihydric alcohol, heating to 90 ℃, weighing 15 parts of nitrile rubber, uniformly stirring, slowly adding 12 parts of grafted modified vinyl ester resin into the mixture under stirring, uniformly stirring, heating to 105 ℃, refluxing and preserving heat for 40 minutes, and cooling to room temperature to obtain grafted vinyl ester resin modified nitrile rubber A;
(2) preparing modified polyurethane emulsion: adding 12 parts of calcium ricinoleate into a reaction kettle with a thermometer, a stirring device and a gas guide tube, introducing nitrogen trickle, dehydrating for 1h at 70 ℃ under reduced pressure, cooling to room temperature, sequentially adding 24 parts of toluene diisocyanate, 13 parts of diethylene glycol, 1 part of a chain extender and 1 part of tartaric acid subjected to drying treatment, heating to 50 ℃, carrying out heat preservation reaction for 3h, cooling to room temperature, dropwise adding 4 parts of prepared triethylamine aqueous solution with the mass fraction of 1%, and stopping dropwise adding 1 part of triethylamine aqueous solution when the pH value of the solution is adjusted to 7 under vigorous stirring, and continuing to stir vigorously for 10min to obtain uniformly dispersed white emulsion to obtain modified polyurethane emulsion;
(3) preparation of polyurethane paste: adding 55 parts of the modified polyurethane emulsion obtained in the step (2) and 1.1 parts of sodium dodecyl sulfate into a four-neck flask, quickly stirring and emulsifying for 0.5h, dropwise adding a mixed solution consisting of 10 parts of methyl methacrylate, 5 parts of butyl acrylate and 2.3 parts of acrylic acid and 2.3 parts of acrylamide at 80 ℃, dropwise adding 0.05 part of potassium persulfate, finishing dropwise adding within 2h, carrying out heat preservation reaction at 80 ℃ for 2h, cooling and discharging to obtain a polyurethane paste B;
(4) the preparation of the concrete corrosion-resistant waterproof coating comprises the following steps:
respectively weighing 60 parts of the grafted vinyl ester resin modified nitrile rubber A, 50 parts of polyurethane paste B and 10 parts of ethanol in parts by weight, respectively adding the materials into a reaction kettle in the sequence of B → ethanol → A, fully and uniformly stirring, then adding 0.3 percent of magnesium oxide by weight, and uniformly stirring to obtain the concrete corrosion-resistant waterproof coating.
According to the scheme, the nitrile rubber is carboxyl-terminated liquid nitrile rubber, the carboxyl content is 0.045%, and the acrylonitrile content is 18%.
According to the scheme, the cross-linking agent is zinc naphthenate.
According to the scheme, the preparation method of the graft modified vinyl ester resin comprises the following steps: adding 66 parts of bisphenol A and 65 parts of dimethylbenzene solvent into a reaction kettle, slowly adding 100 parts of 16 mass percent sodium hydroxide solution after dissolving, dropwise adding 25 parts of chloroethanol, controlling the reaction temperature to be 95 ℃, adding 22 parts of maleic anhydride, 13 parts of methacrylic acid, 0.05 part of dibutyltin maleate and 13 parts of styrene, protecting with nitrogen, keeping the reaction temperature at 150 ℃, adding 13 parts of polyoxypropylene monohydric alcohol and 15 parts of 2, 4-toluene diisocyanate, uniformly mixing at 65 ℃, heating to 165 ℃, stirring for reacting for 0.5h, and evaporating the solvent to obtain the polyoxypropylene grafted modified vinyl ester resin.
According to the scheme, the chain extender is polyoxyethylene polyamine or polyoxypropylene polyamine.
Example 2
A preparation method of a concrete corrosion-resistant waterproof coating comprises the following steps:
(1) preparing grafted vinyl ester resin modified nitrile rubber:
weighing 31 parts of polyoxypropylene trihydric alcohol by weight, drying for 24 hours at 80 ℃ under the vacuum of 500Pa, and then drying by using 4 multiplied by 10
-10Soaking the m molecular sieve for 48 hours, uniformly dispersing 3.5 parts of 3, 3 '-dichloro-4, 4' -diphenylmethane diamine into dried polyoxypropylene trihydric alcohol, heating to 100 ℃, weighing 18 parts of nitrile rubber, uniformly stirring, slowly adding 13 parts of graft modified vinyl ester resin into the mixture under stirring, uniformly stirring, heatingRefluxing and preserving the temperature for 30 minutes at 110 ℃, and cooling to room temperature to obtain grafted vinyl ester resin modified nitrile rubber A;
(2) preparing modified polyurethane emulsion: adding 14 parts of calcium ricinoleate into a reaction kettle with a thermometer, a stirring device and a gas guide tube, introducing nitrogen trickle, dehydrating for 1h at 80 ℃ under reduced pressure, cooling to room temperature, sequentially adding 27 parts of toluene diisocyanate, 15 parts of diethylene glycol, 2 parts of a chain extender and 3 parts of tartaric acid subjected to drying treatment, heating to 55 ℃, carrying out heat preservation reaction for 3h, cooling to room temperature, dropwise adding 4 parts of prepared triethylamine aqueous solution with the mass fraction of 1%, and stopping dropwise adding 1 part of triethylamine aqueous solution when the pH value of the solution is adjusted to 8 under vigorous stirring, and continuing to stir vigorously for 10min to obtain uniformly dispersed white emulsion to obtain modified polyurethane emulsion;
(3) preparation of polyurethane paste: adding 60 parts of the modified polyurethane emulsion obtained in the step (2) and 1.3 parts of sodium dodecyl sulfate into a four-neck flask, quickly stirring and emulsifying for 0.5h, dropwise adding a mixed solution consisting of 12 parts of methyl methacrylate, 8 parts of butyl acrylate and 4 parts of acrylic acid and 4.1 parts of acrylamide at 80 ℃, dropwise adding 0.1 part of potassium persulfate, finishing dropwise adding within 2h, carrying out heat preservation reaction at 80 ℃ for 2h, cooling and discharging to obtain a polyurethane paste B;
(4) the preparation of the concrete corrosion-resistant waterproof coating comprises the following steps:
respectively weighing 60 parts of the grafted vinyl ester resin modified nitrile rubber A, 50 parts of polyurethane paste B and 15 parts of ethanol in parts by weight, respectively adding the materials into a reaction kettle in the sequence of B → ethanol → A, fully and uniformly stirring, then adding 0.3 percent of magnesium oxide by weight, and uniformly stirring to obtain the concrete corrosion-resistant waterproof coating.
According to the scheme, the nitrile rubber is carboxyl-terminated liquid nitrile rubber, the carboxyl content is 0.057%, and the acrylonitrile content is 26%.
According to the scheme, the cross-linking agent is triethylene diamine.
According to the scheme, the preparation method of the graft modified vinyl ester resin comprises the following steps: adding 75 parts of bisphenol A and 77 parts of dimethylbenzene solvent into a reaction kettle, dissolving, slowly adding 130 parts of 16 mass percent sodium hydroxide solution, dropwise adding 33 parts of chloroethanol, controlling the reaction temperature at 100 ℃, adding 33 parts of maleic anhydride, 15 parts of methacrylic acid, 0.1 part of dibutyltin maleate and 16 parts of styrene, protecting with nitrogen, keeping the reaction temperature at 160 ℃, adding 24 parts of polyoxypropylene monohydric alcohol and 22 parts of 2, 4-toluene diisocyanate, uniformly mixing at 70 ℃, heating to 180 ℃, stirring, reacting for 1 hour, and evaporating the solvent to obtain the polyoxypropylene grafted modified vinyl ester resin.
According to the scheme, the chain extender is polyoxyethylene polyamine.
Comparative example 1
This comparative example compares to example 2 in step (4) the grafted vinyl ester resin modified nitrile rubber is omitted except that the process steps are the same.
Comparative example 2
This comparative example compares to example 2 in step (2) calcium ricinoleate is omitted except that the process steps are the same.
Comparative example 3
This comparative example is compared with example 2, the magnesium oxide in step (4) is omitted, except that the process steps are otherwise identical.
Comparative example 4
This comparative example compares to example 2 in step (2) the chain extender is omitted except that the process steps are otherwise the same.
Comparative example 5
This comparative example compares to example 2 in step (3), omitting acrylamide, except that the process steps are the same.
TABLE 1 Performance test results of concrete corrosion-resistant waterproof coating materials of examples and comparative examples
| Item | Example 1 | Example 2 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 |
| Tensile strength MPa | 12.3 | 11.5 | 9.3 | 6.1 | 4.3 | 5.4 | 8.9 |
| Tear Strength N/mm | 40.4 | 39.7 | 25.3 | 35.1 | 33.2 | 34.1 | 33.7 |
| Low temperature flexibility-35 deg.C | Without cracks | Without cracks | Without cracks | Without cracks | Without cracks | Without cracks | Without cracks |
| Water impermeability for 120min | 0.4MPa water impermeability | 0.4MPa water impermeability | 0.4MPa water impermeability | 0.4MPa water impermeability | 0.3MPa water impermeability | 0.4MPa water impermeability | 0.4MPa water impermeability |
| Water absorption% | 3.2 | 3.1 | 2.9 | 3.1 | 3.2 | 3.3 | 3.4 |
| Combustion performance | Non-burning droppings | Non-burning droppings | Non-burning droppings | Non-burning droppings | Non-burning droppings | Non-burning droppings | Non-burning droppings |
| Concrete peel strength N/mm | 3.5 | 3.6 | 3.1 | 3.3 | 3.4 | 3.5 | 3.5 |
| Alkali-resistant saturated calcium hydroxide solution for 500h | Without peeling | Without peeling | Without peeling | Without peeling | Without peeling | Without peeling | Without peeling |
| Wet peel strength N/mm | 0.5 | 0.5 | 0.5 | 0.5 | 0.4 | 0.4 | 0.4 |
| Impact resistance kg m | 2.1 | 2.3 | 2.2 | 2.0 | 1.8 | 1.9 | 1.9 |
| 750 pieces of abrasion resistance, 500r/mg | 23 | 26 | 29 | 31 | 32 | 30 | 33 |
| High wind dynamic deformation capacity 10000 times | Without cracks | Without cracks | Without cracks | Without cracks | Without cracks | Without cracks | Without cracks |
| Tensile strength retention in acid treatment 2% sulfuric acid solution for 168 h% | 83 | 84 | 78 | 74 | 69 | 73 | 75 |
| Tensile strength retention rate of alkali treatment saturated calcium hydroxide solution for 168 hours% | 88 | 87 | 82 | 80 | 79 | 81 | 78 |
Note: low temperature bendability was tested as 10.2.2 in GB/T16777-1997; the water impermeability is tested according to 11.2.2 in GB/T16777-1997, and the tensile strength and the elongation at break are tested according to 6.9 in GB/T19250-2013; the tearing strength is tested according to 6.10 in GB/T19250-2013; the low-temperature flexibility is tested according to GB/T1677 chapter 14; the wet base bond strength was tested in GB/T16777-2008, Chapter 8; the bonding strength with concrete is tested according to the method A of 7.1 in GB/T16777-2008; the water absorption rate is tested according to 6.15 in GB/T19250-2013; alkali resistance was tested according to GB/T9265-2009; the peel strength with concrete was tested according to GB/T2790-1995; the combustion performance was tested according to GB/T8626-2007, using a vertical combustion test method.
As can be seen from Table 1, the corrosion-resistant waterproof coating for concrete in each example has good adhesion, corrosion resistance, flexibility and impact resistance, and has very good corrosion resistance.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and changes can be made without departing from the inventive concept of the present invention, and these modifications and changes are within the protection scope of the present invention.
Claims (5)
1. The preparation method of the concrete corrosion-resistant waterproof coating is characterized by comprising the following steps of:
(1) preparing grafted vinyl ester resin modified nitrile rubber:
weighing 23-31 parts by weight of polyoxypropylene triol, drying at 70-80 ℃ under 500-666.6 Pa for 12-24 h, and then drying by using 4 x 10
-10Soaking a m molecular sieve for 24-48 h, uniformly dispersing 2.2-3.5 parts of 3, 3 '-dichloro-4, 4' -diphenylmethane diamine into dried polyoxypropylene trihydric alcohol, heating to 90-100 ℃, weighing 15-18 parts of nitrile rubber, uniformly stirring, slowly adding 12-13 parts of graft modified vinyl ester resin while stirring, heating to 105-110 ℃, refluxing and preserving heat for 30-40 minutes, and cooling to room temperature to obtain the graft vinyl ester resin modified vinyl esterA nitrile rubber A;
(2) preparing modified polyurethane emulsion: adding 12-14 parts of calcium ricinoleate into a reaction kettle with a thermometer, a stirring device and a gas guide tube, introducing nitrogen trickle, dehydrating for 1h at 70-80 ℃ under reduced pressure, cooling to room temperature, sequentially adding 24-27 parts of toluene diisocyanate, 13-15 parts of diethylene glycol, 1-2 parts of a chain extender and 1-3 parts of tartaric acid subjected to drying treatment, heating to 50-55 ℃, carrying out heat preservation reaction for 3h, cooling to room temperature, dropwise adding 3-4 parts of a prepared triethylamine aqueous solution with the mass fraction of 1%, stopping dropwise adding 1-2 parts of the triethylamine aqueous solution when the pH value of the solution is adjusted to 7-8 under vigorous stirring, and continuing to vigorously stir for 10min to obtain uniformly dispersed white emulsion to obtain modified polyurethane emulsion;
(3) preparation of polyurethane paste: adding 55-60 parts of the modified polyurethane emulsion obtained in the step (2) and 1.1-1.3 parts of sodium dodecyl sulfate into a four-neck flask, quickly stirring and emulsifying for 0.5h, dropwise adding a mixed solution consisting of 10-12 parts of methyl methacrylate, 5-8 parts of butyl acrylate and 2.3-4 parts of acrylic acid at 80 ℃ and 2.3-4.1 parts of acrylamide, dropwise adding 0.05-0.1 part of potassium persulfate, finishing dropwise adding within 2-3 h, carrying out heat preservation reaction for 2h at 80 ℃, cooling and discharging to obtain a polyurethane paste B;
(4) the preparation of the concrete corrosion-resistant waterproof coating comprises the following steps:
respectively weighing 50-60 parts of the grafted vinyl ester resin modified nitrile rubber A, 40-50 parts of polyurethane paste B and 10-15 parts of ethanol in parts by weight, respectively adding the materials into a reaction kettle in the sequence of B → ethanol → A, fully and uniformly stirring, then adding magnesium oxide accounting for 0.3 percent of the total weight, and uniformly stirring to obtain the concrete corrosion-resistant waterproof coating.
2. The preparation method of the concrete corrosion-resistant waterproof coating material according to claim 1, wherein the nitrile rubber is carboxyl-terminated liquid nitrile rubber, the carboxyl content is 0.045-0.057%, and the acrylonitrile content is 18-26%.
3. The method for preparing the concrete corrosion-resistant waterproof coating material according to claim 1, wherein the cross-linking agent is one of triethylene diamine, stannous octoate and zinc naphthenate.
4. The preparation method of the concrete corrosion-resistant waterproof coating material according to claim 1, wherein the preparation method of the graft modified vinyl ester resin comprises the following steps: adding 66-75 parts of bisphenol A and 65-77 parts of dimethylbenzene solvent into a reaction kettle, slowly adding 100-130 parts of 16 mass percent sodium hydroxide solution after dissolving, then dropwise adding 25-33 parts of chloroethanol, controlling the reaction temperature to be 95-100 ℃, then adding 22-33 parts of maleic anhydride, 13-15 parts of methacrylic acid, 0.05-0.1 part of dibutyltin maleate and 13-16 parts of styrene, protecting with nitrogen, keeping the reaction temperature to be 150-160 ℃, then adding 13-24 parts of polyoxypropylene monohydric alcohol and 15-22 parts of 2, 4-toluene diisocyanate, uniformly mixing at the temperature of 65-70 ℃, heating to 165-180 ℃, stirring for reaction for 0.5-1 h, and evaporating the solvent to obtain the polyoxypropylene graft modified vinyl ester resin.
5. The preparation method of the concrete corrosion-resistant waterproof coating material according to claim 1, wherein the chain extender is polyoxyethylene polyamine or polyoxypropylene polyamine.
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