A dryer and its preparation method, a water-emulsified air-drying alkyd resin and its preparation method, and a coating

Abstract

The present invention provides a drier, a preparation method thereof, a water-emulsified air-drying alkyd resin, a preparation method thereof, and a coating, belonging to the technical field of coatings. The preparation method of the drier comprises the following steps: (1) Mixing sodium hydroxide, an organic acid and water and carrying out a saponification reaction to obtain a saponification product; (2) Adding a manganese source solution to the saponification product obtained in the step (1) and carrying out a displacement reaction to obtain an intermediate product; (3) Mixing the intermediate product obtained in the step (2) with an amine compound and a solvent to obtain the drier. The present invention prepares a coordination complex drier of manganese ions by reacting manganese with an organic acid and an amine compound. The drier does not contain cobalt elements, is harmless to the human body, and has a good drying effect, capable of shortening the drying time of the coating film. The results of the examples show that for the coating composed of the drier prepared by the present invention, its surface drying time is 100 min or less.

Description

Technical Field

[0001] The present invention belongs to the technical field of coatings, and particularly relates to a drier, a preparation method thereof, a water-emulsified air-drying alkyd resin, a preparation method thereof, and a coating. Background Art

[0002] Conventional alkyd resin coatings generally use organic solvents such as benzene and hydrocarbons. However, organic solvents are volatile, which can pollute the air. In response to the call for developing environmentally friendly coatings, scholars have carried out research on waterborne alkyd resin coatings. Waterborne alkyd resin coatings save more than 80% of the organic solvents in the solvent-based coating formulation and are environmentally friendly coatings that reduce pollution and save resources. However, the main solvent of waterborne alkyd resin coatings is water. The latent heat of vaporization of water is higher than that of organic solvents, and the relative evaporation rate is slow, resulting in too long drying time of the coating film.

[0003] To shorten the drying time, driers are generally added. The existing driers are cobalt-based driers, which will cause drier loss due to hydrolysis in the coating. To compensate for the drier loss caused by hydrolysis, more driers are often added. However, in recent years, the International Agency for Research on Cancer of the World Health Organization has listed cobalt and cobalt compounds in the list of Group 2B carcinogens. Therefore, there is an urgent need for a drier with excellent drying effect and cobalt-free. Summary of the Invention

[0004] The purpose of the present invention is to provide a drier, a preparation method thereof, a water-emulsified air-drying alkyd resin, a preparation method thereof, and a coating. The drier prepared by the present invention does not contain cobalt element and can shorten the drying time of the coating.

[0005] To achieve the above-mentioned invention purpose, the present invention provides the following technical solutions:

[0006] The present invention provides a preparation method of a drier, comprising the following steps:

[0007] (1) Mix sodium hydroxide, organic acid and water and carry out saponification reaction to obtain a saponification product;

[0008] (2) Add a manganese source solution to the saponification product obtained in the step (1) and carry out a displacement reaction to obtain an intermediate product;

[0009] (3) Mix the intermediate product obtained in the step (2) with an amine compound and a solvent to obtain a drier.

[0010] Preferably, the mass ratio of sodium hydroxide to organic acid in the step (1) is 1:(1-5).

[0011] Preferably, the temperature of the saponification reaction in the step (1) is 50-150°C.

[0012] Preferably, the saponification reaction in step (1) takes 2 to 3 hours.

[0013] Preferably, the mass ratio of the manganese source in the manganese source solution in step (2) to the organic acid in step (1) is 1:(2 - 10).

[0014] The present invention provides a drier prepared by the preparation method described in the above technical solution.

[0015] The present invention also provides a preparation method of a water-emulsified air-drying alkyd resin, including:

[0016] Mixing the drier with an alkyd resin, a surfactant and water, and then carrying out emulsification to obtain a water-emulsified air-drying alkyd resin; the drier is the drier described in the above technical solution.

[0017] Preferably, the temperature of the emulsification is 50 - 60 °C, the pressure of the emulsification is 80 - 120 MPa, and the time of the emulsification is 20 - 40 min.

[0018] The present invention also provides a water-emulsified air-drying alkyd resin prepared by the preparation method described in the above technical solution.

[0019] The present invention also provides a coating, including the water-emulsified air-drying alkyd resin, additives and fillers described in the above technical solution.

[0020] The present invention provides a preparation method of a drier, including the following steps: (1) Mixing sodium hydroxide, an organic acid and water, and then carrying out a saponification reaction to obtain a saponification product; (2) Adding a manganese source solution to the saponification product obtained in step (1), and carrying out a displacement reaction to obtain an intermediate product; (3) Mixing the intermediate product obtained in step (2) with an amine compound and a solvent to obtain a drier. The present invention prepares a coordination complex drier of manganese ions by reacting manganese with an organic acid and an amine compound. This drier does not contain cobalt elements, is not harmful to the human body, and has a good drying effect, and can shorten the drying time of the coating film. The results of the examples show that for the coating composed of the drier prepared by the present invention, its surface drying time is 100 min or less. Detailed Embodiments

[0021] The present invention provides a preparation method of a drier, including the following steps:

[0022] (1) Mixing sodium hydroxide, an organic acid and water, and then carrying out a saponification reaction to obtain a saponification product;

[0023] (2) Adding a manganese source solution to the saponification product obtained in step (1), and carrying out a displacement reaction to obtain an intermediate product;

[0024] (3) Mix the intermediate product obtained in step (2) with an amine compound and a solvent to obtain a drying agent.

[0025] Unless otherwise specified, the present invention does not have special limitations on the sources of the various raw materials, and commercially available products well-known to those skilled in the art can be used.

[0026] In the present invention, sodium hydroxide, an organic acid, and water are mixed and then subjected to a saponification reaction to obtain a saponification product.

[0027] In the present invention, the organic acid preferably includes pyroligneous acid, neodecanoic acid, or isononanoic acid.

[0028] In the present invention, the mixing of sodium hydroxide, the organic acid, and water is preferably as follows: First, mix sodium hydroxide and a part of water to obtain a sodium hydroxide solution, and then add the organic acid and the remaining part of water. Since a large amount of heat is released when sodium hydroxide dissolves in water, by using the mixing method of the present invention, first mixing sodium hydroxide with water and then adding the organic acid and the remaining water can avoid the reaction from being too violent caused by directly adding sodium hydroxide, which is beneficial to the smooth progress of the reaction.

[0029] In the present invention, the mass concentration of the sodium hydroxide solution is preferably 10-15%, more preferably 11-14%.

[0030] In the present invention, the mass ratio of sodium hydroxide to the organic acid is preferably 1:(1-5), more preferably 1:(2-4).

[0031] In the present invention, the mass ratio of the organic acid to the remaining part of water is preferably 1:(2-4), more preferably 1:(2-3).

[0032] By limiting the amounts of the various raw materials within the above ranges in the present invention, the various raw materials can be fully dissolved, and sodium hydroxide and the organic acid can react fully.

[0033] In the present invention, the temperature of the saponification reaction is preferably 50-150°C, more preferably 100-120°C; the time of the saponification reaction is preferably 2-3 h. By limiting the temperature and time of the saponification reaction within the above ranges in the present invention, sodium hydroxide and the organic acid can react fully.

[0034] After obtaining the saponification product, in the present invention, a manganese source solution is added to the saponification product to carry out a displacement reaction to obtain an intermediate product.

[0035] In the present invention, the manganese source in the manganese source solution preferably includes manganese sulfate, manganese acetate, or manganese chloride.

[0036] In the present invention, the solvent in the manganese source solution is preferably water; the mass concentration of the manganese source solution is preferably 10-30%, more preferably 20%. In the present invention, the temperature of the manganese source solution is preferably 70-90°C, more preferably 80°C. By limiting the temperature of the manganese source solution within the above range in the present invention, it is possible to avoid a large impact on the temperature of the system when adding.

[0037] In the present invention, the mass ratio of the manganese source to the organic acid in the manganese source solution is preferably 1:(2-10), more preferably 1:(4-8). By limiting the mass ratio of the manganese source to the organic acid in the manganese source solution within the above range in the present invention, it is possible to make the two react fully.

[0038] In the present invention, the temperature of the displacement reaction is preferably the same as the temperature of the saponification reaction. In the present invention, the end point of the displacement reaction is preferably the stratification of the solution. In the present invention, during the displacement reaction, manganese undergoes a displacement reaction with sodium in the saponification product.

[0039] After the displacement reaction is completed, in the present invention, it is preferred to stratify the solution obtained from the displacement reaction, take the upper soap solution, and obtain an intermediate product.

[0040] The present invention has no special limitation on the operation of the stratification, and the technical solutions for stratification well-known to those skilled in the art can be adopted.

[0041] After obtaining the intermediate product, in the present invention, the intermediate product is mixed with an amine compound and a solvent to obtain a drier.

[0042] In the present invention, the solvent is preferably an alcohol solvent; the alcohol solvent preferably includes ethanol, ethylene glycol, n-hexanol or isopropanol.

[0043] In the present invention, the amine compound preferably includes ethyl p-aminobenzoate, 4-imino-2-pentanone, 3-(N-ethylamino)heptane or 3-methyl-2-(N-methylamino)pentane.

[0044] In the present invention, the mixing of the intermediate product with the amine compound and the solvent is preferably as follows: First, the intermediate product is mixed with a part of the solvent to obtain a soap solution-solvent system; then the amine compound and the remaining solvent are mixed to obtain an amine-solvent system; finally, the soap solution-solvent system and the amine-solvent system are mixed to obtain a drier. By adopting the mixing method of the present invention, each component can be mixed more fully.

[0045] In the present invention, in the soap solution - solvent system, the mass ratio of the soap solution to the solvent is preferably 1:(20 - 30), more preferably 1:(22 - 28); in the amine - solvent system, the mass ratio of the amine compound to the solvent is preferably 1:(1 - 4); when the soap solution - solvent system and the amine - solvent system are mixed, the volume ratio of the soap solution - solvent system to the amine - solvent system is preferably (4 - 9):1, more preferably (5 - 8):1. By limiting the proportions of the various components within the above ranges, the present invention enables the amine compound to be fully complexed with the soap solution.

[0046] The present invention prepares a coordination complex drier of manganese ions by reacting manganese with an organic acid and an amine compound. This drier does not contain cobalt element and is harmless to the human body. By controlling parameters such as the composition of the various components and the reaction temperature, the drying effect of the drier is further improved.

[0047] The present invention provides a drier prepared by the preparation method described in the above technical solution.

[0048] The drier prepared by the present invention does not contain toxic and harmful elements and has excellent drying effect.

[0049] The present invention also provides a preparation method of a water - emulsified air - drying alkyd resin, including:

[0050] Mixing the drier with an alkyd resin, a surfactant and water, and then emulsifying to obtain a water - emulsified air - drying alkyd resin; the drier is the drier described in the above technical solution.

[0051] The present invention has no special limitation on the source of the alkyd resin, and a commercially available product or a product prepared by a conventional preparation method well - known to those skilled in the art can be used.

[0052] In the present invention, the mass ratio of the drier to the alkyd resin is preferably 1:(90 - 100). By limiting the mass ratio of the drier to the alkyd resin within the above range, a better drying effect can be achieved.

[0053] In the present invention, the surfactant preferably includes a non - ionic surfactant and an anionic surfactant; the non - ionic surfactant preferably includes alkyl polyglycoside, polyoxyethylene fatty amine, pentaerythritol fatty acid ester or coconut oil diethanolamide; the anionic surfactant preferably includes sodium oleate, potassium lauryl ether phosphate, sodium alkyl sulfonate or linear alkylbenzene sulfonate; the mass ratio of the non - ionic surfactant to the anionic surfactant is preferably 1:(0.5 - 1.5), more preferably 1:1. In the present invention, the surfactant can reduce the surface tension of the resin and has good compatibility with the drier, which can further shorten the surface - drying time.

[0054] In the present invention, the mass ratio of the surfactant to the alkyd resin is preferably 1:(15 - 25), more preferably 1:20. By limiting the type and amount of the surfactant within the above range, the surface tension of the resin can be further reduced, and the surface drying time can be shortened.

[0055] In the present invention, the mass ratio of the surfactant to water is preferably 1:(14 - 20), more preferably 1:(16 - 18).

[0056] In the present invention, the mixing of the drier with the alkyd resin, surfactant and water is preferably as follows: First, mix the drier and the alkyd resin, then mix the surfactant and water, and finally mix the two.

[0057] In the present invention, the pH value of the system after mixing the drier with the alkyd resin, surfactant and water is preferably 6.5 - 7.5, more preferably 7. In the present invention, sodium hydroxide is preferably added to adjust the pH value of the system. There is no special limitation on the addition amount of the sodium hydroxide, as long as the pH value of the system is within the above range.

[0058] In the present invention, the mass ratio of the mixture after mixing the drier and the alkyd resin to the mixture after mixing the surfactant and water is preferably 1:(0.5 - 1.5), more preferably 1:1. By limiting the ratio of the two within the above range, the surface tension of the resin can be further reduced, and the surface drying time can be shortened.

[0059] In the present invention, the emulsification temperature is preferably 50 - 60°C, more preferably 55°C; the emulsification pressure is preferably 80 - 120 MPa, more preferably 100 MPa; the emulsification time is preferably 20 - 40 min, more preferably 30 min. By limiting the emulsification temperature, pressure and time within the above range, each component can be fully emulsified.

[0060] By adding a surfactant and controlling its composition and addition amount in the present invention, the surface tension of the resin can be reduced, and it has good compatibility with the drier, further shortening the surface drying time of the coating.

[0061] The present invention also provides a water-emulsified air-drying alkyd resin prepared by the preparation method described in the above technical solution.

[0062] The water-emulsified air-drying alkyd resin prepared by the present invention has a short surface drying time.

[0063] The present invention also provides a coating, comprising the water-emulsified air-drying alkyd resin, additives and fillers described in the above technical solution.

[0064] By weight parts, the coating preferably comprises 30-80 parts of water-emulsified air-drying alkyd resin, 1-5 parts of additives, and 25-60 parts of fillers.

[0065] By weight parts, the coating preferably comprises 30-80 parts of water-emulsified air-drying alkyd resin, more preferably 40-70 parts.

[0066] Based on the mass of the water-emulsified air-drying alkyd resin being 30-80 parts, the coating preferably comprises 1-5 parts of additives, more preferably 2-4 parts.

[0067] The present invention has no special limitation on the types of the additives, and the additives well-known to those skilled in the art for coatings can be used. In the present invention, the additives preferably comprise defoamers, leveling agents, thickeners, dispersants, and wetting agents.

[0068] In the present invention, the mass ratio of the defoamer, leveling agent, thickener, dispersant, and wetting agent in the additives is preferably (1-2):(1-3):(1-3):(2-4):(1-3), more preferably 2:3:2:3:2. The present invention limits the composition and dosage of the additives within the above ranges, which can better improve the comprehensive performance of the coating.

[0069] Based on the mass of the water-emulsified air-drying alkyd resin being 30-80 parts, the coating preferably comprises 25-60 parts of fillers, more preferably 30-50 parts.

[0070] The present invention has no special limitation on the types of the fillers, and the fillers well-known to those skilled in the art for coatings can be used. In the present invention, the fillers preferably comprise barium sulfate, calcium carbonate, titanium dioxide, and talc powder.

[0071] In the present invention, the mass ratio of barium sulfate, calcium carbonate, titanium dioxide, and talc powder in the fillers is preferably (3-5):(1-3):(1-4):(2-4), more preferably 4:2:3:3. The present invention limits the composition and dosage of the fillers within the above ranges, which can better improve the comprehensive performance of the coating.

[0072] The present invention adds additives and fillers to improve the comprehensive performance of the coating while the coating has a short drying time.

[0073] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the embodiments in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts shall fall within the scope of protection of the present invention.

[0074] Example 1

[0075] (1) Add 36 g of manganese sulfate to 144 g of water and stir to prepare an aqueous manganese sulfate solution with a mass concentration of 20%. Dissolve 12 g of NaOH in 88 g of water and stir to obtain an aqueous sodium hydroxide solution with a mass concentration of 12%. Add 43.7 g of pyroligneous acid (the mass ratio of sodium hydroxide to pyroligneous acid is 1:3.6) and 87.4 g of water (the mass ratio of pyroligneous acid to water is 1:2), stir and heat up to boiling. After 2 h, add 30 g of the 20% aqueous manganese sulfate solution at 80 °C to the above system (the mass ratio of manganese sulfate to pyroligneous acid is 1:7), stir until the solution is stratified, take the upper layer of soap solution, and add it to 800 g of ethanol solution to obtain a soap solution - ethanol system (the mass ratio of soap solution to ethanol is 1:26);

[0076] Dissolve 200 g of ethyl p - aminobenzoate in 800 g of ethanol to obtain an ethyl p - aminobenzoate - ethanol system;

[0077] Take 200 mL of the ethyl p - aminobenzoate - ethanol system (the mass ratio of ethyl p - aminobenzoate to ethanol is 1:4), add it to 800 mL of the soap solution - ethanol system (the volume ratio of the soap solution - ethanol system to the ethyl p - aminobenzoate - ethanol system is 4:1), stir until evenly mixed to obtain a drier.

[0078] Example 2

[0079] (1) Add 36 g of manganese chloride to 144 g of water and stir to prepare an aqueous manganese chloride solution with a mass concentration of 20%. Dissolve 12 g of NaOH in 88 g of water and stir to obtain an aqueous sodium hydroxide solution with a mass concentration of 12%. Add 43.7 g of neodecanoic acid (the mass ratio of sodium hydroxide to neodecanoic acid is 1:3.6) and 131.1 g of water (the mass ratio of neodecanoic acid to water is 1:3), stir and heat up to boiling. After 2 h, add 40 g of the 20% aqueous manganese chloride solution at 80 °C to the above system (the mass ratio of manganese chloride to neodecanoic acid is 1:5.5), stir until the solution is stratified, take the upper layer of soap solution, and add it to 1200 g of ethylene glycol solution to obtain a soap solution - ethylene glycol system (the mass ratio of soap solution to ethylene glycol is 1:30);.

[0080] Dissolve 600 g of 4 - imino - 2 - pentanone in 800 g of ethylene glycol to obtain a 4 - imino - 2 - pentanone - ethylene glycol system;

[0081] Take 200 mL of the 4 - imino - 2 - pentanone - ethylene glycol system (the mass ratio of 4 - imino - 2 - pentanone to ethylene glycol is 1:1.3), add it to 1000 mL of the soap solution - ethylene glycol system (the volume ratio of the soap solution - ethylene glycol system to the 4 - imino - 2 - pentanone - ethylene glycol system is 5:1), stir until evenly mixed to obtain a drier.

[0082] Example 3

[0083] All of tall oil fatty acid (305.9 kg), pentaerythritol (138.1 kg), phthalic anhydride (148.0 kg) and reflux xylene (47.4 kg) were added to a reaction kettle. CO2 was introduced, and slow stirring was started. The temperature was raised to 180 °C in 1 h, kept warm for 1 h, then raised to 200 °C in 1 h and kept warm for 2 h. Sampling was carried out to measure the acid value reaching 10 mgKOH / g and the viscosity (Gardner tube) reaching 10 s as the reaction end point. After cooling, a medium-oil alkyd resin was obtained;

[0084] 20 g of the drier prepared in Example 1 was mixed with 2000 g of alkyd resin (the mass ratio of the drier to the alkyd resin was 1:100). 50 g of alkyl polyglycoside and 50 g of sodium oleate were added to 1920 g of water (the mass ratio of alkyl polyglycoside to sodium oleate was 1:1, the total mass of alkyl polyglycoside and sodium oleate to the mass of water was 1:19.2, and the total mass of alkyl polyglycoside and sodium oleate to the mass of alkyd resin was 1:20). Stirring was carried out to prepare a surfactant system. This surfactant system was added to the above alkyd resin system containing the drier and stirred and mixed (the mass ratio of the mixture after mixing the drier and the alkyd resin to the mixture after mixing alkyl polyglycoside, sodium oleate and water was 1:1). The stirring speed was 300 r / min, and the pH of the system was adjusted to 7 with potassium hydroxide. Emulsification was carried out at 55 °C and 100 MPa for 30 min to obtain a water-emulsified air-drying alkyd resin.

[0085] Example 4

[0086] All of double-bleached soybean oil (253.7 kg), bleached tallow oil (28.2 kg), benzoic acid (67.7 kg), pentaerythritol (94.2 kg), phthalic anhydride (148.0 kg) and reflux xylene (45.1 kg) were added to a reaction kettle. CO2 was introduced, and slow stirring was started. The temperature was raised to 180 °C in 1 h and kept warm for 1 h; then the temperature was raised to 200 °C in 1 h and kept warm for 2 h. Sampling was carried out to measure the acid value reaching 10 mgKOH / g and the viscosity (Gardner tube) reaching 10 s as the reaction end point. After cooling, a long-oil alkyd resin was obtained;

[0087] Take 20 g of the drier prepared in Example 2 and mix it with 1800 g of alkyd resin (the mass ratio of the drier to the alkyd resin is 1:90). Add 60 g of coconut fatty acid diethanolamide and 60 g of alkyl sulfonate (the mass ratio of coconut fatty acid diethanolamide to alkyl sulfonate is 1:1, the total mass of coconut fatty acid diethanolamide and alkyl sulfonate to the mass of water is 1:14, and the total mass of coconut fatty acid diethanolamide and alkyl sulfonate to the mass of alkyd resin is 1:15) to 1700 g of water, and stir to prepare a surfactant system. Add this surfactant system to the above alkyd resin system containing the drier and stir to mix (the mass ratio of the mixture after mixing the drier and alkyd resin to the mixture after mixing coconut fatty acid diethanolamide, alkyl sulfonate and water is 1:1). The stirring speed is 300 r / min, adjust the pH of the system to 7 with potassium hydroxide, and emulsify at 55 °C and 100 MPa for 30 min to obtain a water-emulsified air-drying alkyd resin.

[0088] Example 5

[0089] Take 1600 g of the water-emulsified air-drying alkyd resin prepared in Example 3, and add 40 g of additives, including defoamer TEGOFoamex 825 (6.67 g), leveling agent KMT-5257N (9.99 g), thickener Viscoatex 730 (6.67 g), dispersant KMT-3004 (9.99 g), wetting agent WET 517 (6.68 g) (the mass ratio of defoamer, leveling agent, thickener, dispersant and wetting agent is 2:3:2:3:2); add 1200 g of pigments and fillers, including 400 g of barium sulfate, 200 g of calcium carbonate, 300 g of titanium dioxide, 300 g of talc (the mass ratio of barium sulfate, calcium carbonate, titanium dioxide and talc is 4:2:3:3), stir, and mix the system uniformly to obtain a water-emulsified air-drying alkyd resin paint, and its surface drying time is 100 min.

[0090] Example 6

[0091] Take 1200 g of the water-emulsified air-drying alkyd resin prepared in Example 4, and add 60 g of additives, including defoamer TEGOFoamex 825 (10 g), leveling agent KMT-5257N (15 g), thickener Viscoatex 730 (10 g), dispersant KMT-3004 (15 g), wetting agent WET 517 (10 g) (the mass ratio of defoamer, leveling agent, thickener, dispersant and wetting agent is 2:3:2:3:2); add 1140 g of pigments and fillers, including 380 g of barium sulfate, 190 g of calcium carbonate, 285 g of titanium dioxide, 285 g of talc (the mass ratio of barium sulfate, calcium carbonate, titanium dioxide and talc is 4:2:3:3), continue to stir, and mix the system uniformly to obtain a water-emulsified air-drying alkyd resin paint, and its surface drying time is 85 min.

[0092] Comparative Example 1

[0093] Replace the drier in Example 3 with a conventional cobalt-based drier to obtain a water-emulsified air-drying alkyd resin, and then prepare a water-emulsified air-drying alkyd resin coating according to Example 5. Its surface drying time is more than 2 h.

[0094] In summary, the drier prepared by the present invention does not contain cobalt element, and the coating composed thereof has a shorter surface drying time.

[0095] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can also be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A preparation method of a drier, comprising the following steps: (1) Mix sodium hydroxide, organic acid and water and carry out saponification reaction to obtain a saponification product; The organic acid is pyroligneous acid or neodecanoic acid; (2) Add a manganese source solution to the saponification product obtained in the step (1) and carry out a displacement reaction to obtain an intermediate product; the manganese source in the manganese source solution is manganese sulfate or manganese chloride; (3) Mix the intermediate product obtained in the step (2) with an amine compound and a solvent to obtain a drier; the amine compound is ethyl p-aminobenzoate or 4-imino-2-pentanone.

2. The preparation method according to claim 1, wherein In the step (1), the mass ratio of sodium hydroxide to organic acid is 1:(1-5).

3. The preparation method according to claim 1, characterized in that, In the step (1), the temperature of the saponification reaction is 50-150 °C.

4. The preparation method according to claim 1 or 3, characterized in that In the step (1), the time of the saponification reaction is 2-3 h.

5. The preparation method according to claim 1, characterized in that, In the step (2), the mass ratio of the manganese source in the manganese source solution to the organic acid in the step (1) is 1:(2-10).

6. A drier prepared by the preparation method according to any one of claims 1-5.

7. A preparation method of a water-emulsified air-drying alkyd resin, comprising: Mix the drier with an alkyd resin, a surfactant and water and carry out emulsification to obtain a water-emulsified air-drying alkyd resin; The drier is the drier according to claim 6.

8. The preparation method according to claim 7, characterized in that, The temperature of the emulsification is 50-60 °C, the pressure of the emulsification is 80-120 MPa, and the time of the emulsification is 20-40 min.

9. A water-emulsified air-drying alkyd resin prepared by the preparation method according to claim 7 or 8.

10. A coating, comprising the water-emulsified air-drying alkyd resin according to claim 9, an additive and a filler.