Preparation method of waterproof and weather-resistant water-based paint for roads

Abstract

The invention relates to the technical field of coatings, and discloses a preparation method of a waterproof and weather-resistant water-based coating for roads, and the waterproof and weather-resistant water-based coating for the roads is obtained by mixing 100 parts by weight of water-based epoxy resin, 2-5 parts by weight of 2, 4-diaminoalkanoic acid-6-(2, 4-dihydroxyphenyl)-1, 3, 5-triazine, 1-5 parts by weight of modified silicon dioxide and the like. In the thermocuring process of the epoxy resin coating, carboxyl of 2, 4-diamino alkanoic acid-6-(2, 4-dihydroxyphenyl)-1, 3, 5-triazine can participate in the curing reaction of epoxy resin, a good toughening effect is achieved, the water absorption rate is reduced, and the ultraviolet resistance and weather resistance are improved. After being modified, the nano silicon dioxide has better dispersity and compatibility in the coating, can play better reinforcing and toughening roles, and is beneficial to improving the impact strength and bending strength of the coating.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a method for preparing a waterproof and weather-resistant water-based coating for roads. Background Art

[0002] Epoxy resin coatings are widely used in the fields of roads and bridges, building decoration, electronic appliances, and ship transportation because of their good anti-corrosion properties, insulation properties, and mechanical strength. Epoxy resin coatings have poor toughness, and the paint film is prone to aging and cracking when exposed to the sun and rain outdoors for a long time, and the protective performance deteriorates. Therefore, it is necessary to improve the toughness of epoxy resin coatings, as well as their weather resistance properties such as water resistance, waterproofing, and UV resistance. Adding anti-UV absorbers to the coating can improve its anti-UV weathering properties. Common anti-UV absorbers include benzophenones, triazoles, triazines, and the like.

[0003] Nano silicon dioxide has a large specific surface area, high mechanical strength, and good heat resistance. It has important applications in toughening and modification of polymer materials such as epoxy resin, acrylic resin, and polyvinyl chloride. Chinese patent CN110819216B discloses a low-temperature curing powder coating and a preparation method thereof. The powder coating prepared by using modified nano silicon dioxide, a diamino ultraviolet absorber, a carboxyl-terminated polyester resin, and an epoxy resin as raw materials has good resistance to ultraviolet aging. However, this invention patent does not improve the water resistance, impact strength, flexural strength, and other properties of epoxy resin coatings. Summary of the invention

[0004] (I) Technical problems to be solved: The present invention provides a water-based epoxy coating for roads that is waterproof, wear-resistant, weather-resistant and UV-resistant.

[0005] (II) Technical solution: A method for preparing a waterproof and weather-resistant water-based coating for roads:

[0006] (1) Add isopropanol, 2-5 parts by weight of 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine, and sodium hydroxide aqueous solution into a reaction container, stir, add 100 parts by weight of nano-silicon dioxide, heat to 70-90° C., stir and modify for 3-6 hours, condense and reflux during stirring, filter, wash with isopropanol and water in turn, and dry to obtain modified silicon dioxide.

[0007] (2) Add 100 parts by weight of water-based epoxy resin, 2-5 parts by weight of 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine, 1-5 parts by weight of modified silica, 0.5-0.8 parts by weight of defoaming agent, and 0.2-0.4 parts by weight of leveling agent into a container, stir and mix well, and then add 2.7-3.4 parts by weight of curing agent to obtain a waterproof and weather-resistant water-based coating for roads.

[0008] Preferably, the mass fraction of the sodium hydroxide aqueous solution is 0.5-3%.

[0009] Preferably, the curing agent is 2-ethyl-4-methylimidazole or 2-methylimidazole.

[0010] Preferably, the preparation method of 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine is as follows: 1,4-dioxane, 160-184 parts by weight of aminoalkanoic acid, and 180-230 parts by weight of N,N-diisopropylethylamine are added to a reaction vessel, and a 1,4-dioxane solution containing 100 parts by weight of 2,4-dichloro-6-(2,4-dihydroxyphenyl)-1,3,5-triazine is added dropwise in an ice-water bath, and the mixture is stirred at room temperature for 2-3 hours, and then heated to 70-90°C and reacted for 8-12 hours. During the reaction, the mixture is condensed and refluxed, and the solvent is removed by distillation under reduced pressure, and the mixture is washed with ice water. The product is recrystallized in isopropanol to obtain 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine. The reaction formula is:

[0011]

[0012] Preferably, the structural formula of the condensed reflux aminoalkanoic acid is a is 9, 10 or 11.

[0013] (III) Technical effect: The 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine prepared by the present invention contains carboxyl groups. During the heating modification process, the carboxyl groups react with the surface of silica, thereby achieving surface modification of nano-silica, reducing the agglomeration of silica, and improving the dispersibility in water-based epoxy resin coatings.

[0014] The invention uses waterborne epoxy resin as a film-forming substance of the coating, adds 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine as an anti-ultraviolet absorber, and uses modified silicon dioxide as a toughening and reinforcing agent. After the modification, the nano silicon dioxide reduces agglomeration, has better dispersibility and compatibility in the waterborne epoxy resin coating, can play a better reinforcing and toughening role, and is beneficial to improving the mechanical properties of the coating such as impact strength and bending strength.

[0015] During the thermal curing process of the epoxy resin coating of the present invention, the carboxyl group of 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine can participate in the curing reaction of the epoxy resin, thereby improving the crosslinking degree and tightness of the molecular chain of the epoxy resin, inhibiting the entry of water molecules into the epoxy resin matrix, and at the same time introducing hydrophobic and flexible long-chain alkyl groups into the epoxy resin molecular chain, thereby playing a good toughening role, improving the impact strength and bending strength of the epoxy resin, and reducing the water absorption rate.

[0016] The 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine of the present invention contains an o-phenol triazine ring structure, which can absorb ultraviolet rays and convert light energy into chemical energy, so that the paint film has a higher ultraviolet absorption rate and a lower ultraviolet light transmittance, and exhibits good anti-ultraviolet performance. The epoxy resin water-based paint surface has better weather resistance and mechanical properties such as water resistance and anti-ultraviolet. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the infrared spectrum of 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine of Example 1. DETAILED DESCRIPTION

[0018] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] The preparation method of 2,4-dichloro-6-(2,4-dihydroxyphenyl)-1,3,5-triazine is as follows: add 120mL chlorobenzene, 30mmol cyanuric chloride to a reaction container, add 33mmol aluminum chloride and 36mmol resorcinol in an ice water bath, react for 8h, pour the solution into 120mL water, adjust the pH of the solution to 2, let it stand for 18h, filter it by suction, wash it with ether, dry it, add it to acetone, heat it and filter it, and obtain 2,4-dichloro-6-(2,4-dihydroxyphenyl)-1,3,5-triazine. The structural formula is

[0020] Water-based epoxy resin, Henan Shuizhihuan Industrial Co., Ltd. Nano-silicon dioxide, average particle size 15um, Shanghai Yingcheng New Materials Co., Ltd.

[0021] Embodiment 1:

[0022] (1) 40 mL of 1,4-dioxane, 17.3 g (86.07 mmol) of 11-aminoundecanoic acid, and 18 g of N,N-diisopropylethylamine were added to a reaction vessel, and 20 mL of a 1,4-dioxane solution containing 10 g of 2,4-dichloro-6-(2,4-dihydroxyphenyl)-1,3,5-triazine was added dropwise in an ice-water bath. The mixture was stirred at room temperature for 3 h, then heated to 75° C. and reacted for 12 h. The solvent was removed by distillation under reduced pressure, and the mixture was washed with ice water. The product was recrystallized from isopropanol to obtain 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine. Figure 1In the infrared spectrum, 3417 cm -1 It is the absorption peak of phenolic hydroxyl -OH, 2942cm -1 is an alkyl chain -CH 2 The absorption peak is 1722cm -1 It is the absorption peak of carboxyl carbonyl -C=O-.

[0023] (2) Add 30 mL of isopropanol, 40 mg of 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine, and 6 mL of a 0.5% sodium hydroxide aqueous solution into a reaction container, stir, add 2 g of nano-silica, heat to 80° C., stir and modify for 3 h, condense and reflux during stirring, filter, wash with isopropanol and water in turn, and dry to obtain modified silica.

[0024] (3) 100 g of waterborne epoxy resin, 2 g of 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine, 1 g of modified silica, 0.5 g of defoamer TEGO FOAMEX 825, and 0.4 g of leveling agent EfkaSL3034 were added to a container, stirred and mixed, and then 3.4 g of curing agent 2-ethyl-4-methylimidazole was added to obtain a waterproof and weather-resistant waterborne coating for roads.

[0025] Embodiment 2:

[0026] (1) 40 mL of 1,4-dioxane, 16 g of 10-aminodecanoic acid, and 23 g of N,N-diisopropylethylamine were added to a reaction vessel, and 20 mL of a 1,4-dioxane solution containing 10 g of 2,4-dichloro-6-(2,4-dihydroxyphenyl)-1,3,5-triazine was added dropwise in an ice-water bath. The mixture was stirred at room temperature for 2 h, and then heated to 90° C. and reacted for 8 h. During the reaction, the mixture was condensed and refluxed, and the solvent was removed by distillation under reduced pressure. The mixture was washed with ice water, and the product was recrystallized from isopropanol to obtain 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine.

[0027] (2) Add 40 mL of isopropanol, 70 mg of 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine, and 5 mL of a 3% sodium hydroxide aqueous solution into a reaction container, stir, add 2 g of nano-silica, heat to 70° C., stir and modify for 6 h, condense and reflux during stirring, filter, wash with isopropanol and water in turn, and dry to obtain modified silica.

[0028] (3) 100 g of waterborne epoxy resin, 3.5 g of 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine, 3 g of modified silica, 0.8 g of defoamer TEGO FOAMEX 825, and 0.2 g of leveling agent EfkaSL3034 were added to a container, stirred and mixed, and then 3 g of curing agent 2-ethyl-4-methylimidazole was added to obtain a waterproof and weather-resistant waterborne coating for roads.

[0029] Embodiment 3:

[0030] (1) 50 mL of 1,4-dioxane, 18.4 g of 12-aminododecanoic acid, and 21.3 g of N,N-diisopropylethylamine were added to a reaction vessel, and 25 mL of a 1,4-dioxane solution containing 10 g of 2,4-dichloro-6-(2,4-dihydroxyphenyl)-1,3,5-triazine was added dropwise in an ice-water bath. The mixture was stirred at room temperature for 3 h, and then heated to 70° C. and reacted for 12 h. During the reaction, the mixture was condensed and refluxed, and the solvent was removed by distillation under reduced pressure. The mixture was washed with ice water, and the product was recrystallized from isopropanol to obtain 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine.

[0031] (2) Add 40 mL of isopropanol, 100 mg of 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine, and 5 mL of a 2% sodium hydroxide aqueous solution into a reaction container, stir, add 2 g of nano-silica, heat to 90° C., stir and modify for 4 h, condense and reflux during stirring, filter, wash with isopropanol and water in turn, and dry to obtain modified silica.

[0032] (3) 100 g of waterborne epoxy resin, 5 g of 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine, 5 g of modified silica, 0.8 g of defoamer TEGO FOAMEX 825, and 0.2 g of leveling agent EfkaSL3034 were added to a container, stirred and mixed, and then 2.7 g of curing agent 2-methylimidazole was added to obtain a waterproof and weather-resistant waterborne coating for roads.

[0033] Comparative Example 1:

[0034] (1) Add 100 g of water-based epoxy resin, 0.5 g of defoamer TEGO FOAMEX 825, and 0.4 g of leveling agent EfkaSL3034 into a container, stir and mix, and then add 3.4 g of curing agent 2-ethyl-4-methylimidazole to obtain a waterproof and weather-resistant water-based coating for roads.

[0035] Comparative Example 2:

[0036] (1) 100 g of waterborne epoxy resin, 2 g of 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine (prepared according to the method of Example 1), 0.5 g of defoamer TEGO FOAMEX 825, and 0.4 g of leveling agent EfkaSL3034 were added to a container, stirred and mixed, and then 3.4 g of curing agent 2-ethyl-4-methylimidazole was added to obtain a waterproof and weather-resistant waterborne coating for roads.

[0037] Comparative Example 3:

[0038] (1) 100 g of waterborne epoxy resin, 1 g of modified silica (prepared according to the method of Example 1), 0.5 g of defoamer TEGO FOAMEX 825, and 0.4 g of leveling agent EfkaSL3034 were added to a container, stirred and mixed, and then 3.4 g of curing agent 2-ethyl-4-methylimidazole was added to obtain a waterproof and weather-resistant waterborne coating for roads.

[0039] Comparative Example 4:

[0040] (1) 100 g of waterborne epoxy resin, 2 g of 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine (prepared according to the method of Example 1), 1 g of nano-silicon dioxide, 0.5 g of defoamer TEGO FOAMEX 825, and 0.4 g of leveling agent EfkaSL3034 were added to a container, stirred and mixed, and then 3.4 g of curing agent 2-ethyl-4-methylimidazole was added to obtain a waterproof and weather-resistant waterborne coating for roads.

[0041] Comparative Example 5:

[0042] (1) Add 40 mL of 1,4-dioxane, 7.66 g (86.07 mmol) of β-alanine, and 18 g of N,N-diisopropylethylamine to a reaction vessel, and dropwise add 20 mL of a 1,4-dioxane solution containing 10 g of 2,4-dichloro-6-(2,4-dihydroxyphenyl)-1,3,5-triazine in an ice-water bath. Stir and react at room temperature for 3 h, then heat to 75°C and react for 12 h. Distill under reduced pressure to remove the solvent, wash with ice water, and recrystallize the product in isopropanol to obtain 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine. The structural formula is:

[0043]

[0044] (2) Add 30 mL of isopropanol, 40 mg of 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine, and 6 mL of a 0.5% sodium hydroxide aqueous solution into a reaction container, stir, add 2 g of nano-silica, heat to 80° C., stir and modify for 3 h, condense and reflux during stirring, filter, wash with isopropanol and water in turn, and dry to obtain modified silica.

[0045] (3) 100 g of waterborne epoxy resin, 2 g of 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine, 1 g of modified silica, 0.5 g of defoamer TEGO FOAMEX 825, and 0.4 g of leveling agent EfkaSL3034 were added to a container, stirred and mixed, and then 3.4 g of curing agent 2-ethyl-4-methylimidazole was added to obtain a waterproof and weather-resistant waterborne coating for roads.

[0046] The water-based paint (without adding curing agent) was placed at room temperature for 30 days to observe the dispersion of the emulsion.

[0047] Table 1

[0048] Dispersion Example 1 No stratification, no precipitation Example 2 No stratification, no precipitation Example 3 No stratification, no precipitation Comparative Example 1 No stratification, no precipitation Comparative Example 2 No stratification, no precipitation Comparative Example 3 No stratification, no precipitation Comparative Example 4 No stratification, with obvious sediment Comparative Example 5 No stratification, no precipitation

[0049] It can be seen from the above table that the water-based coatings prepared in Examples 1-3 and Comparative Examples 3-4 have no precipitation and good dispersibility. This is mainly because the nano-silicon dioxide is surface-modified with 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine, which reduces the agglomeration and improves the dispersibility in water-based epoxy resin coatings, making it difficult to form precipitates.

[0050] The silicon dioxide added in Comparative Example 4 has not been surface modified, has poor dispersibility in the waterborne epoxy resin coating, and is easily agglomerated and forms precipitates.

[0051] Spray the water-based paint on the tinplate surface and cure it at 85℃ for 5h to form a paint film. Use a UV-visible spectrophotometer and a transmittance tester to test the transmittance of the paint film to ultraviolet light at 365nm. The smaller the transmittance, the greater the ultraviolet light absorption rate, and the better the anti-ultraviolet performance.

[0052] The water-based coating was cast into a mold, cured at 85°C for 8 hours, and cooled to room temperature to form a casting specimen. The impact strength and flexural strength were tested according to the national standard GB / T 2567-2021.

[0053] Weigh the casting sample and record it as m 0 , completely immersed in water for 72 hours, the water temperature is 25℃, take out the casting sample, absorb the surface moisture with filter paper, weigh it, record it as m 1 , calculate the water absorption rate Q. The calculation formula is Q = (m 1 -m0 ) / m 0 ×100%.

[0054] Table 2

[0055]

[0056] It can be seen from the above table that the waterborne epoxy resin coating of Comparative Example 1 has high UV transmittance and water absorption, poor UV resistance, waterproofness and weather resistance, and low impact strength and bending strength, and poor toughness.

[0057] The water-based epoxy resin coating of Example 1-3 is added with 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine, which contains long-chain alkyl and carboxyl groups. The carboxyl groups can participate in the curing reaction of the epoxy resin, improve the crosslinking degree and tightness of the epoxy resin molecular chain, and inhibit the entry of water molecules into the epoxy resin matrix. At the same time, the hydrophobic and flexible long-chain alkyl groups are introduced into the epoxy resin molecular chain, which plays a good toughening role, improves the impact strength and bending strength of the epoxy resin, and reduces the water absorption rate. 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine contains an o-phenol triazine ring structure It can absorb ultraviolet rays and convert light energy into chemical energy, so that the paint film has higher ultraviolet absorption rate and lower ultraviolet light transmittance, showing good anti-ultraviolet performance. In addition, nano-silica is surface-modified with 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine to reduce agglomeration, improve its dispersibility and compatibility in water-based epoxy resin coatings, and play a better role in reinforcement and toughening, which is beneficial to improve the mechanical properties of the coating such as impact strength and flexural strength.

[0058] In Comparative Example 2, 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine was added, and the UV transmittance and water absorption of the paint film were reduced, and the UV resistance and water resistance were better than those of Comparative Example 1, and the toughness was increased, and the impact strength and flexural strength became larger. However, no modified nano-silica was added, resulting in lower impact strength and flexural strength than those of Example 1.

[0059] In Comparative Example 3, modified silica was added, and the impact strength and bending strength became larger, but 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine was not added, and the toughness of the epoxy resin coating was poor, which was lower than that of Example 1, and the ultraviolet light transmittance and water absorption were large, and the anti-ultraviolet performance and water resistance were poor. However, the ultraviolet light transmittance of Comparative Example 3 was slightly lower than that of Comparative Example 1, which may be because the surface of the modified silica contained a small amount of 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine, which could slightly absorb ultraviolet light and reduce the ultraviolet light transmittance of the paint film.

[0060] The nano-silicon dioxide added in Comparative Example 4 has not been surface modified, is easy to agglomerate, has poor dispersibility, and has poor compatibility with epoxy resin, resulting in poor reinforcement and toughening effects, and the impact strength and flexural strength are lower than those in Example 1.

[0061] Comparative Example 5: 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine prepared using β-alanine as a raw material does not contain hydrophobic and flexible alkyl long chains, resulting in poor toughness of the epoxy resin and high water absorption.

Claims

1. A method for preparing a waterproof and weather-resistant water-based coating for roads, characterized in that: The preparation method is as follows: (1) adding isopropanol, 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine, and sodium hydroxide aqueous solution into a reaction container, stirring, adding nano-silicon dioxide, heating to a modification temperature, stirring for modification, filtering, washing, and drying to obtain modified silicon dioxide; (2) adding 100 parts by weight of a waterborne epoxy resin, 2-5 parts by weight of 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine, 1-5 parts by weight of modified silica, 0.5-0.8 parts by weight of a defoamer, and 0.2-0.4 parts by weight of a leveling agent into a container, stirring and mixing, and then adding 2.7-3.4 parts by weight of a curing agent to obtain a waterproof and weather-resistant waterborne coating for roads; The structural formula of the 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine is:

2. The method for preparing the waterproof and weather-resistant water-based paint for roads according to claim 1, characterized in that: The modification temperature in (1) is 70-90°C and the modification time is 3-6h.

3. The method for preparing the waterproof and weather-resistant water-based paint for roads according to claim 1, characterized in that: The amount of nano-silicon dioxide in (1) is 100 parts by weight, and the amount of 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine is 2-5 parts by weight.

4. The method for preparing the waterproof and weather-resistant water-based paint for roads according to claim 1, characterized in that: The mass fraction of the sodium hydroxide aqueous solution is 0.5-3%.

5. The method for preparing the waterproof and weather-resistant water-based paint for roads according to claim 1, characterized in that: The preparation method of 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine comprises the following steps: adding 1,4-dioxane, aminoalkanoic acid and N,N-diisopropylethylamine into a reaction container, dripping a 1,4-dioxane solution of 2,4-dichloro-6-(2,4-dihydroxyphenyl)-1,3,5-triazine in an ice water bath, stirring for reaction, performing reduced pressure distillation, washing and recrystallization to obtain 2,4-diaminoalkanoic acid-6-(2,4-dihydroxyphenyl)-1,3,5-triazine.

6. The method for preparing the waterproof and weather-resistant water-based paint for roads according to claim 5, characterized in that: The reaction is first carried out at room temperature for 2-3 h, and then at 70-90° C. for 8-12 h.

7. The method for preparing the waterproof and weather-resistant water-based paint for roads according to claim 5, characterized in that: The amount of 2,4-dichloro-6-(2,4-dihydroxyphenyl)-1,3,5-triazine used is 100 parts by weight, the amount of aminoalkanoic acid used is 160-184 parts by weight, and the amount of N,N-diisopropylethylamine used is 180-230 parts by weight.

8. The method for preparing the waterproof and weather-resistant water-based paint for roads according to claim 7, characterized in that: The structural formula of the aminoalkanoic acid is a is 9, 10 or 11.

9. The method for preparing the waterproof and weather-resistant water-based paint for roads according to claim 1, characterized in that: The curing agent in (2) is 2-ethyl-4-methylimidazole or 2-methylimidazole.

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