Preparation method of impact-resistant high-strength polyurethane coating and application thereof in stone

Abstract

The application relates to the technical field of coatings, and discloses a preparation method of impact-resistant high-strength polyurethane coating and application of the impact-resistant high-strength polyurethane coating in stone materials. The preparation method comprises the following steps: taking tri(2-hydroxyethyl) isocyanurate, 2,2-dimethylol propionic acid, epichlorohydrin and N-benzyl ethanolamine as raw materials, and performing esterification reaction, substitution reaction and ring-opening reaction to obtain a triazine-based hyperbranched polyol. Taking phenyl dichlorophosphine and ethylene glycol as raw materials, substitution reaction is performed to obtain phenyl dihydroxy phosphine oxide. Taking polyethylene glycol as a soft segment, isophorone diisocyanate as a hard segment, phenyl dihydroxy phosphine oxide as a chain extender and the triazine-based hyperbranched polyol with a hydroxyl group as a terminal, a polyurethane emulsion is prepared, and further, the impact-resistant high-strength polyurethane coating is obtained. The polyurethane coating prepared by the application has good impact resistance, flame resistance and strength.

Description

Technical Field

[0001] This invention relates to the field of coating technology, specifically to a method for preparing an impact-resistant, high-strength polyurethane coating and its application in stone. Background Technology

[0002] Currently, with the continuous improvement of people's living standards and living environment in my country, the demand for building stone is also increasing. Before use, stone needs to be treated and then applied to interior and exterior walls, floors, kitchens, etc., bringing a beautiful and luxurious effect to buildings. After cutting and rough polishing, the stone is coated with paint and cured to obtain a finely polished stone surface. With the increasing use of stone, the requirements for the impact resistance and high strength of the coating are also increasing. Therefore, it is necessary to improve the strength and impact resistance of the coating to meet the current market demand.

[0003] Polyurethane coatings possess excellent mechanical strength and high chemical resistance, and are widely used in defense, chemical, and corrosion protection fields. For example, patent application number CN 118359988 A discloses a method for preparing modified waterborne polyurethane coatings. This invention uses polyurethane polyols, isocyanate monomers, and waterborne chain extenders as main raw materials. The resulting polyurethane coating exhibits good flame retardant properties and can be widely used in waterproof coatings, fire-retardant coatings, etc. However, it does not improve the impact resistance or strength of the polyurethane coating. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a method for preparing an impact-resistant, high-strength polyurethane coating and its application in stone materials. The prepared polyurethane coating exhibits good impact resistance, high strength, and flame retardant properties.

[0006] (II) Technical Solution

[0007] A method for preparing an impact-resistant high-strength polyurethane coating, the method being as follows:

[0008] (1) Vacuum-dehydrated polyethylene glycol, isophorone diisocyanate, and 0.08-1% dibutyltin dilaurate were added to a flask, stirred and dispersed, heated to 70-80℃, and reacted for 2-4 hours. Then, triazine hyperbranched polyol was added and the reaction continued for 1-2 hours. After the reaction was completed, phenyl dihydroxyphosphoric acid was added and reacted at 80-90℃ for 1-3 hours. Then, triethylamine was added to neutralize for 20-40 minutes, and the degree of neutralization was controlled to be 60-80%. Sodium bisulfite with a mass fraction of 25% was added to end-cap for 1-2 hours. Finally, deionized water was added to emulsify for 10-20 minutes to obtain a polyurethane emulsion.

[0009] (2) Add dispersant, wetting agent, defoamer, carbon black and thickener to polyurethane emulsion, stir and disperse at a speed of 1000-1500r / min for 30-60min, then add deionized water and stir to mix evenly to obtain impact-resistant high-strength polyurethane coating.

[0010] Preferably, the ratio of polyethylene glycol, isophorone diisocyanate, triazine hyperbranched polyol, and phenyl dihydroxyphosphoric acid oxide is 100g:(50-100)g:(10-50)g:(0.1-1)g.

[0011] Preferably, the ratio of the polyurethane emulsion, dispersant, wetting agent, defoamer, carbon black, and thickener is 100g:(2-4.5)g:(0.5-1)g:(0.1-0.4)g:(0.3-0.8)g:(0.4-0.8)g.

[0012] Preferably, the preparation method of the triazine hyperbranched polyol is as follows:

[0013] S1. Tris(2-hydroxyethyl) isocyanurate, 2,2-dimethylolpropionic acid, p-toluenesulfonic acid, and hydroquinone were added to toluene solvent, stirred and mixed evenly, and the temperature was controlled at 100-120℃ for 5-10 h. After the reaction was completed, the mixture was cooled to room temperature, the pH was adjusted to 7-8 with 10% sodium carbonate, washed with deionized water, and dried to obtain intermediate 1.

[0014] S2. Add intermediate 1 to toluene solvent, stir and disperse, then add boron trifluoride diethyl ether catalyst and epichlorohydrin, react at 55-70℃ for 2-5h, then add 25% sodium hydroxide solution, raise the temperature to 75-85℃, and continue to react for 2-4h. After the reaction is completed, distill under reduced pressure, filter, wash with deionized water, and dry to obtain intermediate 2.

[0015] S3. Add intermediate 2 to toluene solvent, stir and disperse, then add N-benzylethanolamine, heat to 80-100℃, react for 4-10 h, after the reaction is completed, distill under reduced pressure, wash with deionized water, and dry to obtain triazine hyperbranched polyol.

[0016] Preferably, in step S1, the ratio of tris(2-hydroxyethyl) isocyanurate to 2,2-dimethylolpropionic acid is 1 g: (1.5-2) g; the amount of p-toluenesulfonic acid is 8-16% of the total mass of tris(2-hydroxyethyl) isocyanurate and 2,2-dimethylolpropionic acid; and the amount of hydroquinone is 6-10% of the total mass of tris(2-hydroxyethyl) isocyanurate and 2,2-dimethylolpropionic acid.

[0017] Preferably, in S2, the ratio of intermediate 1, boron trifluoride diethyl ether catalyst, and epichlorohydrin is 1g:(0.004-0.01)g:(4-4.5)g.

[0018] Preferably, in S3, the ratio of intermediate 2 to N-benzylethanolamine is 1g:(0.85-1)g.

[0019] Preferably, the method for preparing the phenyl dihydroxyphosphorus oxide is as follows:

[0020] Add phenylphosphonodichloro and ethylene glycol to tetrahydrofuran solvent, stir and disperse, then add N,N-dimethylaniline, heat to 120-130℃, and react for 8-12 hours. After the reaction is completed, adjust the pH to 7-8 with 10% sodium bicarbonate solution, filter, distill under reduced pressure, and dry to obtain phenyl dihydroxyphosphoric acid oxide.

[0021] Preferably, the ratio of phenylphosphonic dichloride to ethylene glycol is 1g:(1-1.5)g.

[0022] Preferably, the impact-resistant high-strength polyurethane coating prepared by the above method is used in stone.

[0023] (iii) Beneficial technical effects

[0024] This invention uses tris(2-hydroxyethyl) isocyanurate and 2,2-dimethylolpropionic acid as catalysts in a p-toluenesulfonic acid esterification reaction to obtain intermediate 1. Intermediate 1 is then substituted with epichlorohydrin under the catalysis of boron trifluoride diethyl ether to obtain intermediate 2. This intermediate 2 is then ring-opened with N-benzylethanolamine to obtain a triazine-based hyperbranched polyol. Using phenylphosphonodichlorohydrin and ethylene glycol as raw materials and N,N-dimethylaniline as a catalyst, phenyl dihydroxyphosphorus oxide is obtained through substitution. This invention also uses polyethylene glycol as the soft segment, isophorone diisocyanate as the hard segment, and phenyl dihydroxyphosphorus oxide as a chain extender to introduce hydroxyl-terminated triazine-based hyperbranched polyols to prepare a polyurethane emulsion. Finally, dispersants, wetting agents, deionized water, etc., are added and mixed evenly to obtain a high-strength, impact-resistant polyurethane coating.

[0025] The high-strength, impact-resistant polyurethane coating prepared by this invention contains a hyperbranched polyol structure. The branched structure of this polyurethane coating can disperse more impact energy when subjected to impact, thereby improving the impact resistance of the coating. The benzene ring and six-membered ring structures present act as rigid structures, and their introduction into the polyurethane coating can enhance its strength and impact resistance. Furthermore, the polyurethane coating prepared by this invention contains a large amount of phosphorus and nitrogen elements, which are flame-retardant elements; their introduction into the polyurethane coating can improve its flame-retardant properties. The polyurethane coating prepared by this invention exhibits good flame-retardant properties, impact resistance, and high strength. Attached Figure Description

[0026] Figure 1 It is the reaction route for triazine-based hyperbranched polyols;

[0027] Figure 2 It is the reaction route of phenyl dihydroxyphosphorus oxide. Detailed Implementation

[0028] To make the technical problem to be solved, the technical solution, and the comparative effects of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it.

[0029] The dispersant is AMP-95;

[0030] The wetting agent is wetting agent OP-10;

[0031] The defoamer is defoamer BYK-066;

[0032] The thickener is TT-935.

[0033] Example 1

[0034] (1) 10g of tris(2-hydroxyethyl) isocyanurate, 15g of 2,2-dihydroxymethylpropionic acid, 2g of p-toluenesulfonic acid and 2g of hydroquinone were added to toluene solvent, stirred and mixed evenly, and the temperature was controlled at 100℃. The reaction was carried out for 10h. After the reaction was completed, the mixture was cooled to room temperature, the pH was adjusted to 8 with 10% sodium carbonate, washed with deionized water and dried to obtain intermediate 1.

[0035] (2) Add 6g of intermediate 1 to toluene solvent, stir and disperse, then add 0.05g of boron trifluoride diethyl ether catalyst and 26g of epichlorohydrin, react at 60℃ for 4h, then add 25% sodium hydroxide solution, raise the temperature to 80℃, and continue to react for 4h. After the reaction is completed, distill under reduced pressure, filter, wash with deionized water, and dry to obtain intermediate 2.

[0036] (3) Add 20g of intermediate 2 to toluene solvent, stir and disperse, then add 18g of N-benzylethanolamine, heat to 100℃, react for 8h, after the reaction is completed, distill under reduced pressure, wash with deionized water, dry, and obtain triazine hyperbranched polyol.

[0037] (4) Add 20g of phenylphosphonic dichloride and 30g of ethylene glycol to tetrahydrofuran solvent, stir and disperse, then add 5 drops of N,N-dimethylaniline, heat to 125℃, react for 8h, after the reaction is completed, adjust the pH to 7 with 10% sodium bicarbonate solution, filter, distill under reduced pressure, and dry to obtain phenyl dihydroxyphosphoric acid oxide.

[0038] (5) 50g of polyethylene glycol after vacuum dehydration, 25g of isophorone diisocyanate, and 0.09% dibutyltin dilaurate were added to a flask, stirred and dispersed, heated to 80℃ and reacted for 2h. Then 5g of triazine hyperbranched polyol was added and the reaction continued for 2h. After the reaction was completed, 0.05g of phenyl dihydroxyphosphoric acid was added and reacted at 85℃ for 3h. Then triethylamine was added to neutralize for 20min and the degree of neutralization was controlled to be 80%. Sodium bisulfite with a mass fraction of 25% was added to end-cap for 1h. Finally, deionized water was added to emulsify for 20min to obtain polyurethane emulsion.

[0039] (6) Add 4.5g of dispersant, 0.8g of wetting agent, 0.2g of defoamer, 0.6g of carbon black and 0.5g of thickener to 100g of polyurethane emulsion, stir and disperse at 1500r / min for 40min, then add 20g of deionized water and stir to mix evenly to obtain impact-resistant high-strength polyurethane coating.

[0040] Example 2

[0041] (1) 10g of tris(2-hydroxyethyl) isocyanurate, 20g of 2,2-dihydroxymethylpropionic acid, 4g of p-toluenesulfonic acid and 1.5g of hydroquinone were added to toluene solvent, stirred and mixed evenly, and the temperature was controlled at 110℃. The reaction was carried out for 5h. After the reaction was completed, the mixture was cooled to room temperature, the pH was adjusted to 7 with 10% sodium carbonate, washed with deionized water and dried to obtain intermediate 1.

[0042] (2) Add 6g of intermediate 1 to toluene solvent, stir and disperse, then add 0.05g of boron trifluoride diethyl ether catalyst and 25g of epichlorohydrin, react at 60℃ for 4h, then add 25% sodium hydroxide solution, raise the temperature to 80℃, and continue to react for 3h. After the reaction is completed, distill under reduced pressure, filter, wash with deionized water, and dry to obtain intermediate 2.

[0043] (3) Add 20g of intermediate 2 to toluene solvent, stir and disperse, then add 18g of N-benzylethanolamine, heat to 100℃, react for 8h, after the reaction is completed, distill under reduced pressure, wash with deionized water, dry, and obtain triazine hyperbranched polyol.

[0044] (4) Add 20g of phenylphosphonic dichloride and 25g of ethylene glycol to tetrahydrofuran solvent, stir and disperse, then add 5 drops of N,N-dimethylaniline, heat to 120℃, react for 10h, after the reaction is completed, adjust the pH to 8 with 10% sodium bicarbonate solution, filter, distill under reduced pressure, and dry to obtain phenyl dihydroxyphosphoric acid oxide.

[0045] (5) Add 50g of polyethylene glycol after vacuum dehydration, 40g of isophorone diisocyanate, and 0.08% dibutyltin dilaurate to a flask, stir and disperse, heat to 70℃, react for 4h, then add 10g of triazine hyperbranched polyol, continue to react for 1h, after the reaction is completed, add 0.2g of phenyl dihydroxyphosphoric acid oxide, react at 90℃ for 1h, then add triethylamine to neutralize for 40min, control the degree of neutralization to 60%, add 25% sodium bisulfite to end cap for 2h, and finally add deionized water to emulsify for 10min to obtain polyurethane emulsion.

[0046] (6) Add 3.5g of dispersant, 0.8g of wetting agent, 0.4g of defoamer, 0.5g of carbon black and 0.6g of thickener to 100g of polyurethane emulsion, stir and disperse at 1500r / min for 50min, then add 16g of deionized water and stir to mix evenly to obtain impact-resistant high-strength polyurethane coating.

[0047] Example 3

[0048] (1) 10g of tris(2-hydroxyethyl) isocyanurate, 18g of 2,2-dihydroxymethylpropionic acid, 3g of p-toluenesulfonic acid and 2.5g of hydroquinone were added to toluene solvent, stirred and mixed evenly, and the temperature was controlled at 120℃. The reaction was carried out for 6h. After the reaction was completed, the mixture was cooled to room temperature, the pH was adjusted to 8 with 10% sodium carbonate, washed with deionized water and dried to obtain intermediate 1.

[0049] (2) Add 6g of intermediate 1 to toluene solvent, stir and disperse, then add 0.024g of boron trifluoride diethyl ether catalyst and 25g of epichlorohydrin, react at 60℃ for 5h, then add 25% sodium hydroxide solution, raise the temperature to 80℃ and continue to react for 4h. After the reaction is completed, distill under reduced pressure, filter, wash with deionized water and dry to obtain intermediate 2.

[0050] (3) Add 20g of intermediate 2 to toluene solvent, stir and disperse, then add 20g of N-benzylethanolamine, heat to 80℃, react for 10h, after the reaction is completed, distill under reduced pressure, wash with deionized water, dry, and obtain triazine hyperbranched polyol.

[0051] (4) Add 20g of phenylphosphonic dichloride and 20g of ethylene glycol to tetrahydrofuran solvent, stir and disperse, then add 5 drops of N,N-dimethylaniline, heat to 130℃, react for 12h, after the reaction is completed, adjust the pH to 7 with 10% sodium bicarbonate solution, filter, distill under reduced pressure, and dry to obtain phenyl dihydroxyphosphoric acid oxide.

[0052] (5) Add 50g of vacuum-dehydrated polyethylene glycol, 50g of isophorone diisocyanate, and 1% by mass of dibutyltin dilaurate to a flask, stir and disperse, heat to 75℃, react for 3h, then add 15g of triazine hyperbranched polyol, continue to react for 1h, after the reaction is completed, add 0.3g of phenyl dihydroxyphosphoric acid oxide, react at 80℃ for 2h, then add triethylamine to neutralize for 30min, control the degree of neutralization to 70%, add 25% by mass of sodium bisulfite to end-cap for 2h, and finally add deionized water to emulsify for 10min to obtain polyurethane emulsion.

[0053] (6) Add 2g of dispersant, 1g of wetting agent, 0.1g of defoamer, 0.5g of carbon black and 0.8g of thickener to 100g of polyurethane emulsion, stir and disperse at 1500r / min for 30min, then add 20g of deionized water and stir to mix evenly to obtain impact-resistant high-strength polyurethane coating.

[0054] Example 4

[0055] (1) 10g of tris(2-hydroxyethyl) isocyanurate, 18g of 2,2-dihydroxymethylpropionic acid, 2g of p-toluenesulfonic acid and 2g of hydroquinone were added to toluene solvent, stirred and mixed evenly, and the temperature was controlled at 115℃. The reaction was carried out for 8h. After the reaction was completed, the mixture was cooled to room temperature, the pH was adjusted to 7 with 10% sodium carbonate, washed with deionized water and dried to obtain intermediate 1.

[0056] (2) Add 6g of intermediate 1 to toluene solvent, stir and disperse, then add 0.04g of boron trifluoride diethyl ether catalyst and 24g of epichlorohydrin, react at 70℃ for 2h, then add 25% sodium hydroxide solution, raise the temperature to 85℃, and continue to react for 2h. After the reaction is completed, distill under reduced pressure, filter, wash with deionized water, and dry to obtain intermediate 2.

[0057] (3) Add 20g of intermediate 2 to toluene solvent, stir and disperse, then add 17g of N-benzylethanolamine, heat to 90℃, react for 6h, after the reaction is completed, distill under reduced pressure, wash with deionized water, dry, and obtain triazine hyperbranched polyol.

[0058] (4) Add 20g of phenylphosphonic dichloride and 25g of ethylene glycol to tetrahydrofuran solvent, stir and disperse, then add 5 drops of N,N-dimethylaniline, heat to 125℃, react for 10h, after the reaction is completed, adjust the pH to 8 with 10% sodium bicarbonate solution, filter, distill under reduced pressure, and dry to obtain phenyl dihydroxyphosphoric acid oxide.

[0059] (5) 50g of polyethylene glycol after vacuum dehydration, 40g of isophorone diisocyanate, and 0.1% dibutyltin dilaurate were added to a flask, stirred and dispersed, heated to 75°C, and reacted for 2h. Then 20g of triazine hyperbranched polyol was added and reacted for another 2h. After the reaction was completed, 0.4g of phenyl dihydroxyphosphoric acid was added and reacted at 85°C for 3h. Then triethylamine was added to neutralize for 20min, and the degree of neutralization was controlled to be 80%. Sodium bisulfite with a mass fraction of 25% was added to end-cap for 1h. Finally, deionized water was added to emulsify for 15min to obtain a polyurethane emulsion.

[0060] (6) Add 3g of dispersant, 0.5g of wetting agent, 0.2g of defoamer, 0.3g of carbon black and 0.5g of thickener to 100g of polyurethane emulsion, stir and disperse at 1000r / min for 50min, then add 15g of deionized water and stir to mix evenly to obtain impact-resistant high-strength polyurethane coating.

[0061] Example 5

[0062] (1) 10g of tris(2-hydroxyethyl) isocyanurate, 18g of 2,2-dihydroxymethylpropionic acid, 3g of p-toluenesulfonic acid and 2g of hydroquinone were added to toluene solvent, stirred and mixed evenly, and the temperature was controlled at 110℃. The reaction was carried out for 8h. After the reaction was completed, the mixture was cooled to room temperature, the pH was adjusted to 8 with 10% sodium carbonate, washed with deionized water and dried to obtain intermediate 1.

[0063] (2) Add 6g of intermediate 1 to toluene solvent, stir and disperse, then add 0.06g of boron trifluoride diethyl ether catalyst and 27g of epichlorohydrin, react at 55℃ for 4h, then add 25% sodium hydroxide solution, raise the temperature to 75℃, continue to react for 3h, after the reaction is completed, distill under reduced pressure, filter, wash with deionized water, dry, and obtain intermediate 2.

[0064] (3) Add 20g of intermediate 2 to toluene solvent, stir and disperse, then add 18g of N-benzylethanolamine, heat to 100℃, react for 4h, after the reaction is completed, distill under reduced pressure, wash with deionized water, dry, and obtain triazine hyperbranched polyol.

[0065] (4) Add 20g of phenylphosphonic dichloride and 25g of ethylene glycol to tetrahydrofuran solvent, stir and disperse, then add 5 drops of N,N-dimethylaniline, heat to 125℃, react for 10h, after the reaction is completed, adjust the pH to 7 with 10% sodium bicarbonate solution, filter, distill under reduced pressure, and dry to obtain phenyl dihydroxyphosphoric acid oxide.

[0066] (5) 50g of polyethylene glycol after vacuum dehydration, 30g of isophorone diisocyanate, and 0.08% dibutyltin dilaurate were added to a flask, stirred and dispersed, heated to 75°C, and reacted for 4h. Then 25g of triazine hyperbranched polyol was added and the reaction continued for 1.5h. After the reaction was completed, 0.5g of phenyl dihydroxyphosphoric acid was added and reacted at 85°C for 3h. Then triethylamine was added for neutralization for 40min, and the degree of neutralization was controlled to be 80%. Sodium bisulfite with a mass fraction of 25% was added for end-capping for 1h. Finally, deionized water was added for emulsification for 15min to obtain polyurethane emulsion.

[0067] (6) Add 4.5g of dispersant, 0.8g of wetting agent, 0.4g of defoamer, 0.8g of carbon black and 0.4g of thickener to 100g of polyurethane emulsion, stir and disperse at 1200r / min for 60min, then add 10g of deionized water and stir to mix evenly to obtain impact-resistant high-strength polyurethane coating.

[0068] Comparative Example 1

[0069] The difference between this comparative example and Example 1 is that in step (5), diethylene glycol is used instead of phenyl dihydroxyphosphorus oxide.

[0070] The coating was applied to a glass plate to obtain a 1.5 mm thick coating. The coating was formed at 23°C and 60% relative humidity, cured for 4 days, demolded, and then cured for 3 days under standard experimental conditions to obtain the coating film.

[0071] The tensile strength of the coating was tested in accordance with GB / T16777-1997.

[0072] The impact resistance of the coating was tested in accordance with GB / T 1732-2020.

[0073] The limiting oxygen index of the coating was tested in accordance with GB / T2406.

[0074] Table 1:

[0075] Tensile strength (MPa) Impact resistance (kg / cm) Oxygen index (%) Example 1 5.46 50 26 Example 2 6.03 50 27 Example 3 7.16 50 29 Example 4 7.92 50 31 Example 5 8.39 50 32 Comparative Example 1 5.04 45 23

[0076] As shown in the table, the polyurethane coating prepared by this invention has good impact resistance, strength and flame retardant properties.

[0077] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for preparing an impact-resistant, high-strength polyurethane coating, characterized in that, The preparation method of the impact-resistant high-strength polyurethane coating is as follows: (1) Vacuum-dehydrated polyethylene glycol, isophorone diisocyanate, and 0.08-1% (w / w) dibutyltin dilaurate are added to a flask, stirred and dispersed, heated to 70-80℃, and reacted for 2-4 hours. Then, triazine hyperbranched polyol is added, and the reaction continues for 1-2 hours. After the reaction is complete, phenyl dihydroxyphosphorus oxide is added, and the reaction is carried out at 80-90℃ for 1-3 hours. Finally, triethylamine is added to neutralize the reaction for 20- After 40 minutes, the neutralization degree is controlled at 60-80%. 25% sodium bisulfite is added for end-capping for 1-2 hours. Finally, deionized water is added for emulsification for 10-20 minutes to obtain a polyurethane emulsion. The ratio of polyethylene glycol, isophorone diisocyanate, triazine hyperbranched polyol, and phenyl dihydroxyphosphoric acid oxide is 100g:(50-100)g:(10-50)g:(0.1-1)g. (2) Add dispersant, wetting agent, defoamer, carbon black and thickener to polyurethane emulsion, stir and disperse at a speed of 1000-1500r / min for 30-60min, then add deionized water and stir to mix evenly to obtain impact-resistant high-strength polyurethane coating. The preparation method of the triazine-based hyperbranched polyol is as follows: S1. Tris(2-hydroxyethyl) isocyanurate, 2,2-dimethylolpropionic acid, p-toluenesulfonic acid, and hydroquinone were added to toluene solvent, stirred and mixed evenly, and the temperature was controlled at 100-120℃ for 5-10 h. After the reaction was completed, the mixture was cooled to room temperature, the pH was adjusted to 7-8 with 10% sodium carbonate, washed with deionized water, and dried to obtain intermediate 1. S2. Add intermediate 1 to toluene solvent, stir and disperse, then add boron trifluoride diethyl ether catalyst and epichlorohydrin, react at 55-70℃ for 2-5h, then add 25% sodium hydroxide solution, raise the temperature to 75-85℃, and continue to react for 2-4h. After the reaction is completed, distill under reduced pressure, filter, wash with deionized water, and dry to obtain intermediate 2. S3. Add intermediate 2 to toluene solvent, stir and disperse, then add N-benzylethanolamine, heat to 80-100℃, react for 4-10 h, after the reaction is completed, distill under reduced pressure, wash with deionized water, and dry to obtain triazine hyperbranched polyol. The preparation method of the phenyl dihydroxy phosphorus oxide is as follows: Add phenylphosphonodichloro and ethylene glycol to tetrahydrofuran solvent, stir and disperse, then add N,N-dimethylaniline, heat to 120-130℃, and react for 8-12 hours. After the reaction is completed, adjust the pH to 7-8 with 10% sodium bicarbonate solution, filter, distill under reduced pressure, and dry to obtain phenyl dihydroxyphosphoric acid oxide.

2. The method for preparing the impact-resistant high-strength polyurethane coating according to claim 1, characterized in that, The ratio of the polyurethane emulsion, dispersant, wetting agent, defoamer, carbon black, and thickener is 100g:(2-4.5)g:(0.5-1)g:(0.1-0.4)g:(0.3-0.8)g:(0.4-0.8)g.

3. The method for preparing the impact-resistant high-strength polyurethane coating according to claim 1, characterized in that, In S1, the ratio of tris(2-hydroxyethyl) isocyanurate to 2,2-dimethylolpropionic acid is 1 g: (1.5-2) g; the amount of p-toluenesulfonic acid is 8-16% of the total mass of tris(2-hydroxyethyl) isocyanurate and 2,2-dimethylolpropionic acid; and the amount of hydroquinone is 6-10% of the total mass of tris(2-hydroxyethyl) isocyanurate and 2,2-dimethylolpropionic acid.

4. The method for preparing the impact-resistant high-strength polyurethane coating according to claim 1, characterized in that, In S2, the ratio of intermediate 1, boron trifluoride diethyl ether catalyst, and epichlorohydrin is 1g:(0.004-0.01)g:(4-4.5)g.

5. The method for preparing the impact-resistant high-strength polyurethane coating according to claim 1, characterized in that, In S3, the ratio of intermediate 2 to N-benzylethanolamine is 1g:(0.85-1)g.

6. The method for preparing the impact-resistant high-strength polyurethane coating according to claim 1, characterized in that, The ratio of phenylphosphonic dichloride to ethylene glycol is 1g:(1-1.5)g.

7. The application of the impact-resistant high-strength polyurethane coating prepared by the method according to claim 1 in stone materials.

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