A self-drying / bakeable dual-purpose hydrolysis-resistant alkyd resin and its preparation method

Abstract

The present invention belongs to the technical field of alkyd resin preparation, and specifically relates to a self-drying / bakeable dual-purpose hydrolysis-resistant alkyd resin and a preparation method thereof. The alkyd resin has a molecular weight of 3000-15000, an acid value of 15-60 mgKOH / g, a hydroxyl value of 50-120 mgKOH / g, a solid content of 65-80%, and a degree of neutralization of 50-100%. The resin is a pure alkyd resin, which improves gloss under high humidity conditions. The alkyd resin can be self-dried at room temperature for use in alkyd self-drying paint, exhibiting high gloss, high hardness, and excellent water resistance. The alkyd resin can also participate in the cross-linking reaction of amino resins for use in alkyd baking varnishes, maintaining high hardness and gloss while having excellent flexibility. The resin can be applied to both general water-based metal baking varnishes and water-based coil baking varnishes. The alkyd resin also has excellent hydrolysis resistance and excellent storage stability.

Description

Technical Field

[0001] The invention belongs to the technical field of alkyd resin preparation, and particularly relates to a self-drying / bakeable dual-purpose hydrolysis-resistant alkyd resin and a preparation method thereof. Background Art

[0002] Due to environmental protection and industry requirements, alkyd coatings have gradually shifted from solvent-based to water-based products. As the main body of coating products, alkyd resins have greatly reduced their comprehensive performance in hydrolysis resistance, gloss, surface drying, hardness, and water resistance of the paint film after being converted to water-based. In addition, in actual applications, the market expects "one resin for multiple uses". The resin can be used for both self-drying coatings and baking paints. Since the use mechanism and application standards of the two types of coatings are different, higher requirements are placed on the performance of the resin.

[0003] Most of the alkyd resins with excellent hydrolysis resistance sold on the market are acrylic resin modified alkyds, but there is a certain amount of ungrafted acrylic resin components in the reaction, which affects the gloss and adhesion of the paint film. Especially under high humidity conditions, the gloss of existing alkyd resins is difficult to achieve a gloss greater than 90 degrees at a 20° angle; and pure alkyd (non-modified) resins face the problem of easy hydrolysis during long-term storage. Summary of the Invention

[0004] In response to the current technical problems, the present invention provides a self-drying / bakeable dual-purpose hydrolysis-resistant alkyd resin and a preparation method thereof. The resin is a pure alkyd resin, and its excellent wettability can ensure excellent gloss after film formation, especially improved gloss under high humidity conditions. The alkyd resin can be self-dried at room temperature and used in alkyd self-drying paint, and has the characteristics of high gloss, high actual hardness, and excellent water resistance. It can also participate in the cross-linking reaction of amino resin and be used in alkyd baking varnish, and has excellent flexibility while maintaining high hardness and high gloss, and can be used in general water-based metal baking varnish, and can also be used in water-based coil baking varnish. The alkyd resin also has excellent hydrolysis resistance and excellent storage stability.

[0005] The present invention introduces a special monomer, which branches onto the main chain of the resin in the form of a side chain group to form an umbrella cap structure, protecting the easily hydrolyzed groups on the resin and solving the problem of unstable storage of water-based alkyd resin; by introducing double bonds and hydroxyl groups into the special monomer, it has the dual functions of self-drying and cross-linking curing. Due to the double bond structure, the side chain group participates in oxidative cross-linking, which improves the cross-linking density under self-drying conditions and improves the water resistance of the paint film. At the same time, due to the reactivity of the side chain, the gloss of the paint film under high humidity conditions is improved, making it resistant to water immersion, fast drying, and fast hardening. At the same time, the special monomer has a hydroxyl structure, which increases the hydroxyl content of the resin. It is used in combination with amino resin for baking paint, and is resistant to MEK (butanone) solvent wiping. It has excellent various resistance indicators and broadens the application field of water-based alkyd resin. The specific technical scheme is as follows:

[0006] A self-drying / bakeable dual-purpose hydrolysis-resistant alkyd resin has a molecular weight of 3,000-15,000, an acid value of 15-60 mgKOH / g, a hydroxyl value of 50-120 mgKOH / g, a solid content of 65-80%, and a neutralization degree of 50-100%.

[0007] Preferably, the solid content of the alkyd resin is 65-75%.

[0008] Preferably, the raw materials for preparing the alkyd resin include a special monomer, and the preparation method of the special monomer is as follows: dihydroxymethylpropionic acid and allyl glyceryl ether are mixed, heated to 120-150° C., and reacted for 2-5 hours to obtain a special monomer; allyl glyceryl ether is one of methacrylate glycidyl ether, allyl-2,3-epoxypropyl ether, o-diallyl bisphenol A diglycidyl ether, cardanol glycidyl ether, allyl fluorinated glycidyl ether, and ethylene glycol diglycidyl ether dimethacrylate phosphate; the molar ratio of dihydroxypropionic acid to allyl glyceryl ether is 1:0.8-1.5.

[0009] Further preferably, the raw materials for preparing the alkyd resin include, by weight: 10-30wt% of polyol, 10-30wt% of polyacid, 10-20wt% of fatty acid, 1-15wt% of special monomer, 0.01-1wt% of catalyst, 1-5wt% of neutralizer, 1-5wt% of water-based monomer, and the balance of hydrophilic solvent.

[0010] More preferably, the polyacid is two or more of isophthalic acid, phthalic acid, terephthalic acid, succinic acid, glutaric acid, phthalic anhydride, adipic acid, cyclohexanedicarboxylic acid, benzoic acid, dimer acid and maleic anhydride in any proportion.

[0011] More preferably, the polyol is one or more of a diol, a triol, or a tetraol in any proportion. Even more preferably, it is one or more of a diol, a triol, a tetraol, a triol, a trimethylolpropane, a butanediol, a neopentyl glycol, a pentanediol, an octanediol, a heptanediol, a cyclohexanedimethanol, a pentaerythritol, or a trihydroxyethane in any proportion.

[0012] More preferably, the water-based monomer is one of phthalic anhydride, trimellitic anhydride, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, dimethylolpropionic acid, sodium isophthalate, and polyethylene glycol, or a mixture of any of the above.

[0013] More preferably, the fatty acid is one or more of soybean oil fatty acid, linoleic acid, eleostearic acid, ricinoleic acid, dehydrated ricinoleic acid, and tall oil acid in any proportion.

[0014] Further preferably, the catalyst is one of antimony, organotin catalyst, and hypophosphorous acid, and the hydrophilic solvent is selected from one of ethylene glycol monobutyl ether, propylene glycol methyl ether, propylene glycol butyl ether, dipropylene glycol methyl ether, diethylene glycol butyl ether, ethylene glycol methyl ether acetate, ethanol, n-butanol, isopropanol, and butanol, or a mixture of any proportions thereof.

[0015] More preferably, the neutralizing agent is selected from one of ammonia water, N,N-dimethylethanolamine, diethanolamine, triethanolamine, triethylamine, 1-methyldiethanolamine, and sodium hydroxide.

[0016] A method for preparing a self-drying / bakeable dual-purpose hydrolysis-resistant alkyd resin is as follows:

[0017] (1) mixing dihydroxypropionic acid and allyl glyceryl ether, heating, and reacting to obtain a special monomer;

[0018] (2) Adding polyol, polyacid, special monomer and fatty acid into the reactor and slowly heating it to 100-120°C, adding the catalyst into the reactor, slowly heating it to 130-150°C, and keeping it warm for 1-1.5 hours;

[0019] (3) Continue to raise the temperature by 5-10°C per hour until it reaches 210-240°C, keep the temperature for reaction, observe the amount of water produced by the reaction, and start measuring the acid value when the water output reaches 88-93%. When the acid value is less than 5-20 mgKOH / g, reduce the temperature to 150-160°C;

[0020] (4) Then add the aqueous monomer and react for 0.5-1h, then cool to 60-80°C;

[0021] (5) Add a hydrophilic solvent and a neutralizer, and stir thoroughly to obtain an alkyd resin.

[0022] The preparation method of the present invention is simple, time-saving and process-safe. After the special monomer is introduced into the alkyd resin synthesized by the present invention, no abnormality occurs when it is stored in a constant temperature box at 50° C. for 12 months.

[0023] The alkyd resin of the present invention can be used for alkyd self-drying paint by self-drying at room temperature, and has the characteristics of high gloss, high actual hardness and excellent water resistance; it can also participate in the cross-linking reaction of amino resin and be used for alkyd baking varnish, and has excellent flexibility while maintaining high hardness and high gloss, and can be used in general water-based metal baking varnish and also in water-based coil baking varnish.

[0024] The present invention introduces a special monomer, which is grafted onto the side chain of the resin, so that the resin has excellent hydrolysis resistance and excellent storage stability, and solves the common problems of poor hydrolysis resistance and difficult application of water-based pure alkyd resins (non-acrylic acid modified alkyd resins). The special monomer in the present invention has a double bond structure, which allows the side chain group to participate in oxidative crosslinking, thereby improving the crosslinking density under self-drying conditions and improving the water resistance of the paint film. At the same time, due to the reactivity of the side chain, the gloss of the paint film under high humidity conditions is improved; at the same time, the special monomer has a hydroxyl structure, which increases the hydroxyl content of the resin, and is matched with amino resins for baking paint. It has excellent various resistance indicators and broadens the application field of water-based alkyd resins. The present invention provides a self-drying / bakeable dual-purpose hydrolysis-resistant alkyd resin, which, as a water-based alkyd resin, effectively reduces the amount of solvent used in the coating, reduces VOC emissions, and is safe and environmentally friendly.

[0025] The present invention provides a self-drying / bakeable dual-purpose hydrolysis-resistant alkyd resin and a preparation method thereof. The resin is a pure alkyd resin that improves the gloss under high humidity conditions, has excellent hydrolysis resistance, and has excellent storage stability. The alkyd resin can be self-dried at room temperature and used in alkyd self-drying paint, which has the characteristics of high gloss, high actual hardness, and excellent water resistance; it can also participate in the cross-linking reaction of amino resins and be used in alkyd baking paint, which has excellent flexibility while maintaining high hardness and high gloss, and can be applied to general water-based metal baking paints and water-based coil baking paints. The pure alkyd resin has excellent resistance indicators, broadens the application field of water-based alkyd resins, effectively reduces the amount of solvent used in the paint, reduces VOC emissions, and is safe and environmentally friendly. DETAILED DESCRIPTION

[0026] The following is a detailed description of the present invention through specific embodiments in the form of examples. However, this should not be construed as limiting the scope of the present invention to the following examples. All technologies implemented based on the above-mentioned contents of the present invention fall within the scope of the present invention. Unless otherwise specified, the following examples are all completed using conventional existing technologies.

[0027] Example 1

[0028] A dual-purpose, air-drying / bakeable, hydrolysis-resistant alkyd resin:

[0029] Synthesis of special monomer: dimethylol propionic acid and allyl-2,3-epoxypropyl ether and other substances are mixed in an amount, heated to 130°C, reacted for 5 hours to obtain the special monomer, and filtered for use;

[0030] 86g of neopentyl glycol, 250g of soybean oil fatty acid, 43g of special monomer, 120g of trimethylolpropane, 10g of adipic acid, 190g of isophthalic acid, and 6g of maleic anhydride were added to a four-necked flask equipped with a thermometer, a stirring device, and a condensation and water separation device, and the temperature was slowly increased to melt all the solid materials, and stirring was started; 0.3g of tin oxide catalyst was added under the condition that the materials were melted at 120°C, and the material temperature was adjusted to 150°C within 2 hours, and the reaction was kept at this temperature for 1 hour. The heating rate was controlled at 10°C / h, and the temperature was gradually increased to 220°C. The reaction was kept at this temperature, and the water output during the reaction process was continuously observed. When the water output reached 90% of the theoretical water output, the acid value was measured. When the theoretical acid value was less than 5mgKOH / g, the material was cooled to 160°C, 30g of trimellitic anhydride was added, and the reaction was carried out for 0.5h. After the acid value was measured to be less than 50mgKOH / g, the temperature was cooled to 60°C;

[0031] The reaction mixture was cooled to 60° C., 25 g of N,N-dimethylethanolamine (a neutralizing agent) was added, and the mixture was stirred for 0.5 hour. 200 g of ethylene glycol monobutyl ether (a hydrophilic solvent) was then added to adjust the solid content of the product to 75 wt %. A self-drying / bakeable dual-purpose hydrolysis-resistant alkyd resin was obtained, with a resin molecular weight of 8000, a degree of neutralization of 75%, and an acid value of 18 mgKOH / g.

[0032] After the special monomer is introduced into the alkyd resin synthesized by the present invention, no abnormality occurs when stored in a 50°C constant temperature box for 12 months. However, the alkyd resin without the special monomer becomes turbid and stratified when stored in a 50°C constant temperature box for 15 days.

[0033] Example 2

[0034] A dual-purpose, air-drying / bakeable, hydrolysis-resistant alkyd resin:

[0035] Synthesis of special monomer: dimethylol propionic acid and glycidyl methacrylate and other substances are mixed in an amount, heated to 130°C, reacted for 5 hours to obtain a special monomer, and filtered for use;

[0036] 80g of pentaerythritol, 260g of soybean oil fatty acid, 43g of special monomer, 110g of trimethylolpropane, 200g of phthalic anhydride, and 4g of maleic anhydride were added to a four-necked flask equipped with a thermometer, a stirring device, and a condensation and water separation device, and the solid materials were slowly heated to melt all of them, and stirring was started; 0.3g of hypophosphorous acid as a catalyst was added under the condition that the materials were melted at 120°C, and the material temperature was adjusted to 150°C within 2 hours, and the reaction was kept at this temperature for 1 hour. The heating rate was controlled at 10°C / h, and the temperature was gradually increased to 220°C, and the reaction was kept at this temperature, and the water output during the reaction process was continuously observed. When the water output reached 90% of the theoretical water output, the acid value was measured. When the theoretical acid value was less than 5mgKOH / g, the material was cooled to 160°C, 35g of trimellitic anhydride was added, and the reaction was carried out for 0.5h. After the acid value was measured to be less than 50mgKOH / g, the temperature was cooled to 60°C;

[0037] The reaction mixture was cooled to 60° C., 20 g of N,N-dimethylethanolamine (a neutralizing agent) was added, and the mixture was stirred for 0.5 hour. 200 g of ethylene glycol monobutyl ether (a hydrophilic solvent) was then added to adjust the solid content of the product to 75 wt %. A self-drying / bakeable dual-purpose hydrolysis-resistant alkyd resin was obtained, with a resin molecular weight of 7000, a degree of neutralization of 70%, and an acid value of 15 mgKOH / g.

[0038] Example 3

[0039] A dual-purpose, air-drying / bakeable, hydrolysis-resistant alkyd resin:

[0040] Synthesis of special monomer: Dimethylol propionic acid and o-diallyl bisphenol A diglycidyl ether and other substances are mixed, heated to 130°C, reacted for 5 hours to obtain the special monomer, and filtered for use;

[0041] 80g of trimethylolpropane, 260g of soybean fatty acid, 40g of special monomer, 110g of glycerol, 200g of phthalic anhydride and 4.5g of maleic anhydride were added to a four-necked flask equipped with a thermometer, a stirring device and a condensation water separator, and the temperature was slowly increased to melt all the solid materials, and stirring was started; 0.3g of hypophosphorous acid as a catalyst was added under the condition of melting the materials at 120°C, the material temperature was adjusted to 150°C within 2h, and the reaction was kept warm for 1h, the heating rate was controlled at 10°C / h, the temperature was gradually increased to 220°C, and the reaction was kept warm at this temperature, the water output during the reaction process was continuously observed, and when the water output reached 90% of the theoretical water output, the acid value was measured. When the theoretical acid value was less than 5mgKOH / g, the material was cooled to 160°C, 35g of trimellitic anhydride was added, the reaction was carried out for 0.5h, and the acid value was measured to be less than 50mgKOH / g, and then the temperature was cooled to 60°C;

[0042] The reaction mixture was cooled to 60° C., 30 g of N,N-dimethylethanolamine (a neutralizing agent) was added, and the mixture was stirred for 0.5 hour. 200 g of ethylene glycol monobutyl ether (a hydrophilic solvent) was then added to adjust the solid content of the product to 75 wt %. A self-drying / bakeable dual-purpose hydrolysis-resistant alkyd resin was obtained, with a resin molecular weight of 7500, a degree of neutralization of 80%, and an acid value of 20 mgKOH / g.

[0043] Example 4

[0044] A dual-purpose, air-drying / bakeable, hydrolysis-resistant alkyd resin:

[0045] Synthesis of special monomer: dimethylol propionic acid and cardanol glycidyl ether and other substances are mixed, heated to 130°C, reacted for 5 hours to obtain the special monomer, and filtered for later use;

[0046] 80g of trimethylolpropane, 260g of linoleic acid, 40g of special monomer, 110g of glycerol, 200g of phthalic acid, and 4.5g of maleic anhydride were added to a four-necked flask equipped with a thermometer, a stirring device, and a condensation and water separation device, and the temperature was slowly increased to melt all the solid materials, and stirring was started; 0.3g of hypophosphorous acid as a catalyst was added under the condition that the materials were melted at 120°C, and the material temperature was adjusted to 150°C within 2 hours, and the reaction was kept at this temperature for 1 hour. The heating rate was controlled at 10°C / h, and the temperature was gradually increased to 220°C, and the reaction was kept at this temperature. The water output during the reaction process was continuously observed. When the water output reached 90% of the theoretical water output, the acid value was measured. When the theoretical acid value was less than 5mgKOH / g, the material was cooled to 160°C, 35g of trimellitic anhydride was added, the reaction was carried out for 0.5h, and the acid value was measured to be less than 50mgKOH / g, and then the temperature was cooled to 60°C;

[0047] The reaction mixture was cooled to 60° C., 18 g of N,N-dimethylethanolamine (a neutralizer) was added, and the mixture was stirred for 0.5 hours. 200 g of propylene glycol methyl ether (a hydrophilic solvent) was then added to adjust the solid content of the product to 75 wt %. A self-drying / bakeable dual-purpose hydrolysis-resistant alkyd resin was obtained with a resin molecular weight of 9000, a degree of neutralization of 65%, and an acid value of 15 mgKOH / g.

[0048] Example 5

[0049] A dual-purpose, air-drying / bakeable, hydrolysis-resistant alkyd resin:

[0050] Synthesis of special monomer: dimethylol propionic acid and allyl fluorinated glycidyl ether and other substances are mixed, heated to 130°C, reacted for 5 hours to obtain the special monomer, and filtered for later use;

[0051] 80g of trimethylolpropane, 260g of dehydrated ricinoleic acid, 40g of special monomer, 110g of pentaerythritol, 215g of phthalic anhydride, and 4.5g of maleic anhydride were added to a four-necked flask equipped with a thermometer, a stirring device, and a condensation and water separation device, and the temperature was slowly increased to melt all the solid materials, and stirring was started; 0.3g of hypophosphorous acid as a catalyst was added under the condition that the materials were melted at 120°C, and the material temperature was adjusted to 150°C within 2 hours, and the reaction was kept warm for 1 hour. The heating rate was controlled at 10°C / h, and the temperature was gradually increased to 220°C. The reaction was kept warm at this temperature, and the water output during the reaction process was continuously observed. When the water output reached 90% of the theoretical water output, the acid value was measured. When the theoretical acid value was less than 5mgKOH / g, the material was cooled to 160°C, 35g of trimellitic anhydride was added, the reaction was carried out for 0.5h, and the acid value was measured to be less than 50mgKOH / g, and then the temperature was cooled to 60°C;

[0052] The reaction temperature was lowered to 60°C, 30 g of N,N-dimethylethanolamine as a neutralizer was added, and the mixture was stirred for 0.5 hours. Then, 200 g of propylene glycol methyl ether as a hydrophilic solvent was added to adjust the solid content of the product to 75 wt % to obtain a self-drying / bakeable dual-purpose hydrolysis-resistant alkyd resin with a resin molecular weight of 10,000, a neutralization degree of 85%, and an acid value of 20 mgKOH / g.

[0053] The alkyd resin of the present invention is not modified by acrylic resin, and its comprehensive performance exceeds that of acrylic acid-modified alkyd resin sold on the market.

[0054] As a self-drying resin, it has the following excellent properties

[0055]

[0056] As a baking varnish resin (with amino resin), it has the following excellent properties

[0057] luster Excellent wettability, high gloss 20° angle> 90, 60° angle> 95 MEK Wipe ≥150 times hardness Pencil hardness ≥2H Storage stability Store at 50℃ for 14 days T-bend ≤3T Adhesion Level 0 Storage stability Store at 50℃ for 14 days

[0058] Test example

[0059] The product in Example 1 was selected and a room temperature air-drying topcoat was prepared according to the following formula. The performance evaluation results are as follows:

[0060] Table 1 Self-drying topcoat formula

[0061] Raw material name Ratio, wt% Alkyd resin 35 Ethylene glycol monobutyl ether 5 NN dimethylethanolamine 0.8 Defoamer 810 0.2 Leveling agent 450 0.1 Substrate wetting agent 4100 0.1 Titanium dioxide 15 Big Red Powder 8 Deionized water 35.8 total 100

[0062] Table 2 Test results of room temperature air-drying topcoat performance

[0063]

[0064]

[0065] The product in Example 1 was selected and the baking paint was prepared according to the following formula. The performance evaluation results are as follows:

[0066] Table 3 Baking paint formula

[0067] Raw material name Ratio, wt% Alkyd resin 35 Ethylene glycol monobutyl ether 5 NN dimethylethanolamine 0.8 Defoamer A10 0.2 Leveling agent 450 0.1 Substrate wetting agent 4100 0.1 Titanium dioxide 15 325 amino resin 7 Deionized water 36.8 total 100

[0068] Table 4 Paint performance test results

[0069]

[0070] Through the paint performance evaluation, the water-based resin has reached the application standard of oil-based resin and has excellent performance.

[0071] The present invention provides a self-drying / bakeable dual-purpose hydrolysis-resistant alkyd resin and a preparation method thereof. The resin is a pure alkyd resin that improves the gloss under high humidity conditions, has excellent hydrolysis resistance, and has excellent storage stability. The alkyd resin can be self-dried at room temperature and used in alkyd self-drying paint, which has the characteristics of high gloss, high actual hardness, and excellent water resistance; it can also participate in the cross-linking reaction of amino resins and be used in alkyd baking paint, which has excellent flexibility while maintaining high hardness and high gloss, and can be applied to general water-based metal baking paints and water-based coil baking paints. The pure alkyd resin has excellent resistance indicators, broadens the application field of water-based alkyd resins, effectively reduces the amount of solvent used in the paint, reduces VOC emissions, and is safe and environmentally friendly.

Claims

1. A self-drying / bakeable dual-purpose hydrolysis-resistant alkyd resin, characterized in that: The alkyd resin has a molecular weight of 3000-15000, an acid value of 15-60 mgKOH / g, a hydroxyl value of 50-120 mgKOH / g, a solid content of 65-80%, and a degree of neutralization of 50-100%; The raw materials for preparing the alkyd resin include a special monomer, and the preparation method of the special monomer is as follows: dimethylol propionic acid and allyl glycerol ether are mixed, heated to 120-150° C., and reacted for 2-5 hours to obtain the special monomer; The allyl glyceryl ether is one of methacrylate glycidyl ether, allyl-2,3-epoxypropyl ether, o-diallyl bisphenol A diglycidyl ether, cardanol glycidyl ether, allyl fluorine-containing glycidyl ether, and ethylene glycol diglycidyl ether dimethacrylate phosphate; The molar ratio of the dimethylolpropionic acid to allyl glyceryl ether is 1:0.8-1.5; The raw materials for preparing the alkyd resin include, by weight, 10-30 wt % of polyol, 10-30 wt % of polyacid, 10-20 wt % of fatty acid, 4.17-15 wt % of special monomer, 0.01-1 wt % of catalyst, 1-5 wt % of neutralizer, 1-5 wt % of water-based monomer, and the balance of hydrophilic solvent.

2. The self-drying / bakeable dual-purpose hydrolysis-resistant alkyd resin according to claim 1, characterized in that: The polyacid is two or more of isophthalic acid, phthalic acid, terephthalic acid, succinic acid, glutaric acid, phthalic anhydride, adipic acid, cyclohexanedicarboxylic acid, dimer acid and maleic anhydride.

3. The self-drying / bakeable dual-purpose hydrolysis-resistant alkyd resin according to claim 1, characterized in that: The polyol is one of diol, triol and tetraol or several of them in any proportion.

4. The self-drying / bakeable dual-purpose hydrolysis-resistant alkyd resin according to claim 1, characterized in that: The water-based monomer is one of phthalic anhydride, trimellitic anhydride, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, dimethylol propionic acid, sodium isophthalate, and polyethylene glycol, or a mixture of several of them in any proportion.

5. The self-drying / bakeable dual-purpose hydrolysis-resistant alkyd resin according to claim 1, characterized in that: The fatty acid is one or more of soybean oil fatty acid, linoleic acid, eleostearic acid, ricinoleic acid, dehydrated ricinoleic acid and tall oil acid in any proportion.

6. The self-drying / bakeable dual-purpose hydrolysis-resistant alkyd resin according to claim 1, characterized in that: The catalyst is one of an antimony-based catalyst, an organic tin catalyst, and hypophosphorous acid; the hydrophilic solvent is selected from one of ethylene glycol monobutyl ether, propylene glycol methyl ether, propylene glycol butyl ether, dipropylene glycol methyl ether, diethylene glycol butyl ether, ethylene glycol methyl ether acetate, ethanol, isopropanol, and butanol, or a mixture of several of them in any proportion.

7. The self-drying / bakeable dual-purpose hydrolysis-resistant alkyd resin according to claim 1, characterized in that: The neutralizing agent is selected from one of ammonia water, N,N-dimethylethanolamine, diethanolamine, triethanolamine, triethylamine, 1-methyldiethanolamine, and sodium hydroxide.

8. The method for preparing the self-drying / bakeable dual-purpose hydrolysis-resistant alkyd resin according to any one of claims 1 to 7 is as follows: (1) Mix dimethylolpropionic acid and allyl glyceryl ether, heat to 120-150°C, and react for 2-5 hours to obtain a special monomer; (2) Add polyol, polyacid, special monomer and fatty acid into the reactor and slowly heat it up. When the temperature reaches 100-120°C, add the catalyst into the reactor and slowly heat it up to 130-150°C. Keep it warm for 1-1.5 hours. (3) Continue to raise the temperature by 5-10°C per hour until it reaches 210-240°C, keep the temperature for reaction, observe the amount of water produced by the reaction, and start measuring the acid value when the water output reaches 88-93%. When the acid value is less than 5-20 mgKOH / g, reduce the temperature to 150-160°C; (4) Then add the aqueous monomer and react for 0.5-1h, then cool to 60-80℃; (5) Add a hydrophilic solvent and a neutralizer and stir thoroughly to obtain an alkyd resin.

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