A triphenyl phosphite modified waterborne alkyd resin, its preparation method and application

Abstract

The present application relates to the technical field of water-based acrylic modified alkyd resin, especially to the field of IPC C08F283, further, to a triphenyl phosphite modified water-based alkyd resin and a preparation method thereof, wherein the raw materials include, by mass fraction, 20-30 parts of fatty acid, 10-20 parts of polyhydric alcohol, 12-20 parts of dibasic acid, 2-6 parts of benzoic acid, 0.02-0.08 parts of catalyst, 0.05-0.15 parts of triphenyl phosphite, 1.5-4.0 parts of dimethylbenzene, 18-25 parts of cosolvent, 2-5 parts of acrylic monomer, 0-15 parts of acrylic ester monomer, 0.3-1.0 parts of initiator and 3-6 parts of neutralizing agent.The present application uses triphenyl phosphite as an antioxidant, reduces the color number of the resin, improves the water resistance of the resin to a certain extent, improves the catalytic efficiency of the catalyst and shortens the synthesis time.

Description

Technical Field

[0001] This invention relates to the field of waterborne acrylic modified alkyd resin technology, particularly to the field of IPC C08F283, and further to a triphenyl phosphite modified waterborne alkyd resin, its preparation method, and its application. Background Technology

[0002] Currently, waterborne coatings are gaining increasing prominence in the coatings industry due to their low VOC (volatile organic compound) content. Among them, waterborne alkyd resins have attracted widespread attention due to their unique advantages, including a wide variety of types, broad applications, good performance, and low price. However, coatings prepared with waterborne alkyd resins suffer from slow drying speed, low hardness, and poor water resistance. Modifying waterborne alkyd resins with acrylic resins results in coatings that combine the characteristics of both acrylic and alkyd resins, significantly improving film properties, particularly drying speed, hardness, water resistance, and gloss and color retention.

[0003] Chinese patent CN 110655617A discloses a method for preparing a self-drying, shock-resistant acrylic modified waterborne alkyd resin for electrical appliances, including a brief synthesis method and process. The synthesis method includes the following steps: soybean oil, pentaerythritol, and hypophosphite are added to a reaction vessel, heated to 220°C, lithium hydroxide is added, and the temperature is raised to 245-250°C for alcoholysis reaction. After 1.5 hours, a sample is taken; the sample-to-methanol ratio is 1:2, and the transparency is observed. If it is transparent, the temperature is lowered; if it is not transparent, the reaction is continued. Samples are taken every half hour until it is transparent.

[0004] However, due to the high esterification reaction temperature (220-240℃) during the synthesis of acrylic-modified waterborne alkyd resins, oleic acid undergoes oxidation and discoloration, leading to a deeper color number in the final waterborne alkyd resin. As mentioned in the patent above, the traditional solution is to add hypophosphite, an antioxidant, to the waterborne alkyd resin. Since hypophosphite is a strong reducing agent, it can reduce the oxidation degree of oleic acid and decrease the color number of the waterborne alkyd resin. However, hypophosphite decomposes into orthophosphoric acid and phosphine at temperatures above 130℃. Phosphine is a highly toxic gas, posing a safety hazard to operators. Hypophosphite is also hydrophilic, affecting the water resistance of the coating prepared from the waterborne alkyd resin. Furthermore, when the waterborne alkyd resin system contains a metal oxide catalyst, hypophosphite consumes some of the metal oxide, reducing catalytic activity and resulting in a longer synthesis reaction time for the waterborne alkyd resin.

[0005] To solve the above-mentioned technical problems, the present invention uses triphenyl phosphite to modify waterborne alkyd resin, which can reduce the color number of modified waterborne alkyd resin, avoid the occurrence of side reactions, shorten the synthesis time of modified waterborne alkyd resin, improve the water resistance of waterborne alkyd resin, and has no impact on the health of operators. Summary of the Invention

[0006] The first aspect of this invention provides a triphenyl phosphite-modified waterborne alkyd resin, comprising, by weight, the following raw materials: 20-30 parts fatty acid, 10-20 parts polyol, 12-20 parts diacid, 2-6 parts benzoic acid, 0.02-0.08 parts catalyst, 0.05-0.15 parts triphenyl phosphite, 1.5-4.0 parts xylene, 18-25 parts cosolvent, 2-5 parts acrylic monomer, 0-15 parts acrylate monomer, 0.3-1.0 parts initiator, and 3-6 parts neutralizer.

[0007] In some preferred embodiments, the triphenyl phosphite-modified waterborne alkyd resin comprises, by weight, the following raw materials: 25-30 parts fatty acid, 10-15 parts polyol, 12-15 parts diacid, 2-4 parts benzoic acid, 0.04-0.06 parts catalyst, 0.09-0.15 parts triphenyl phosphite, 2.0-4.0 parts xylene, 18-20 parts cosolvent, 2-3 parts acrylic monomer, 0-12 parts acrylate monomer, 0.3-0.5 parts initiator, and 3-4 parts neutralizer.

[0008] In some preferred embodiments, the raw material further includes 0 to 15 parts of styrene.

[0009] Preferably, the raw materials also include 0 to 12 parts of styrene.

[0010] In some preferred embodiments, the mass ratio of the acrylate monomer to styrene is (0.7 to 1.5):1.

[0011] In some preferred embodiments, the fatty acid is selected from one or more combinations of soybean oil acid, tall oil acid, and dehydrated ricinoleic acid.

[0012] Preferably, the fatty acid is selected from a combination of soybean oil acid and dehydrated ricinoleic acid or a combination of tall oil acid and dehydrated ricinoleic acid.

[0013] Preferably, the mass ratio of soybean oleic acid to dehydrated ricinoleic acid is (4-13):1.

[0014] More preferably, the mass ratio of soybean oil acid to dehydrated ricinoleic acid is (10-13):1.

[0015] Preferably, the mass ratio of tall oleic acid to dehydrated ricinoleic acid is (4-13):1.

[0016] More preferably, the mass ratio of tall oleic acid to dehydrated ricinoleic acid is (4-7):1.

[0017] In some preferred embodiments, the polyol is selected from one or more combinations of pentaerythritol, trimethylolpropane, dipentaerythritol, glycerol, and bisphenol A polyether polyol.

[0018] Preferably, the polyol is selected from a combination of pentaerythritol and trimethylolpropane.

[0019] Preferably, the mass ratio of pentaerythritol to trimethylolpropane is (0.4–18):1.

[0020] In some preferred embodiments, the dicarboxylic acid is selected from one or more combinations of phthalic anhydride, maleic anhydride, isophthalic acid, and terephthalic acid.

[0021] In some preferred embodiments, the mass ratio of the dicarboxylic acid to benzoic acid is (3-6):1.

[0022] In some preferred embodiments, the catalyst is selected from one or more combinations of dibutyltin oxide, monobutyltin oxide, zinc oxide, and tetrabutyl titanate.

[0023] In some preferred embodiments, the co-solvent is selected from one or more combinations of ethylene glycol butyl ether, diethanol butyl ether, propylene glycol butyl ether, propylene glycol methyl ether, dipropylene glycol methyl ether, and n-butanol.

[0024] In some preferred embodiments, the acrylic monomer is selected from one or a combination of two of acrylic acid and methacrylic acid.

[0025] In some preferred embodiments, the acrylate monomer is selected from one or more combinations of methyl methacrylate, n-butyl methacrylate, n-butyl acrylate, hydroxyethyl methacrylate, hydroxyethyl acrylate, hydroxypropyl methacrylate, isobornyl methacrylate, isobornyl acrylate, and cyclohexyl methacrylate.

[0026] Preferably, the acrylate monomer is selected from a combination of methyl methacrylate and n-butyl acrylate.

[0027] Preferably, the mass ratio of methyl methacrylate to n-butyl acrylate is (2-4):1.

[0028] In some preferred embodiments, the initiator includes initiator I and initiator II; initiator I is 0.2 to 0.5 parts by weight; and initiator II is 0.1 to 0.5 parts by weight.

[0029] In some preferred embodiments, the initiator I is selected from one or more combinations of benzoyl peroxide, tert-butyl peroxy-2-ethylhexanoate, tert-butyl peroxybenzoate, di-tert-butyl peroxybenzoate, and di-tert-pentyl peroxybenzoate; and the initiator II is one or more combinations of tert-butyl peroxybenzoate, di-tert-butyl peroxybenzoate, and di-tert-pentyl peroxybenzoate.

[0030] In some preferred embodiments, the neutralizing agent is selected from one or more combinations of triethylamine, N,N-dimethylethanolamine, AMP95 (2-amino-2-methyl-1-propanol), triethanolamine, and ammonia.

[0031] Through extensive experiments, the inventors discovered that using triphenyl phosphite instead of hypophosphite in the system of this invention not only reduces the color number of the waterborne alkyd resin but also significantly shortens the esterification time without reducing the water resistance of the waterborne alkyd resin. The inventors hypothesize that triphenyl phosphite has good miscibility with alkyd resin in the system of this invention, possessing the dual functions of decomposing hydrogen peroxide and terminating free radical chains. Therefore, it can effectively reduce the oxidative decomposition of fatty acids, reduce the color number of the waterborne alkyd resin, and improve the catalytic efficiency of the catalyst and shorten the esterification time because triphenyl phosphite does not undergo side reactions with the catalyst in the system. Furthermore, triphenyl phosphite is an oleophilic-hydrophobic substance and will not reduce the water resistance of the waterborne alkyd resin in the system of this invention. It can also effectively avoid the harm to human health caused by orthophosphoric acid and highly toxic phosphine produced by the high-temperature decomposition of the antioxidant hypophosphite.

[0032] A second aspect of this invention provides a method for preparing a triphenyl phosphite-modified waterborne alkyd resin, comprising the following steps:

[0033] (1) Add fatty acids, polyols, dicarboxylic acids, benzoic acid, catalyst, triphenyl phosphite, and xylene into a reaction vessel, turn on heating and stirring, first raise the temperature to 160-170℃, and then slowly and uniformly raise the temperature to 220-240℃ over 2-4 hours for heat preservation esterification; react until the acid value is less than 10 mg KOH / g, cool down to below 200℃, and remove xylene under vacuum;

[0034] (2) Cool down to below the boiling point of the cosolvent, add 75-85 wt% cosolvent to fully dissolve and dilute, and then maintain the temperature at 110-150℃;

[0035] (3) Mix acrylic monomers, acrylate monomers, styrene, initiator I and 11-13 wt% cosolvent to form a mixture, and add it dropwise at a uniform rate over 2-4 hours; then add the remaining cosolvent and initiator II mixture dropwise over 0.4-0.6 hours, and continue to keep warm for 2-3 hours;

[0036] (4) Cool down, add neutralizing agent, and disperse and stir at high speed for 20-40 minutes to obtain triphenyl phosphite modified waterborne alkyd resin.

[0037] A third aspect of the present invention provides an application of triphenyl phosphite-modified waterborne alkyd resin for the preparation of coatings.

[0038] Beneficial effects:

[0039] 1. In the synthesis of alkyd resin, this invention replaces the traditional antioxidant hypophosphite with the antioxidant triphenyl phosphite. This not only effectively avoids the harm to human health caused by the orthophosphoric acid and highly toxic phosphine produced by the high-temperature decomposition of hypophosphite, but also avoids the side reactions of hypophosphite with tin oxide and zinc oxide, thus improving the catalytic efficiency of the catalyst and significantly shortening the synthesis time. In addition, triphenyl phosphite can effectively reduce the resin color number, and because it is an oleophilic and hydrophobic substance, it will not reduce the water resistance of the modified waterborne alkyd resin coating.

[0040] 2. In this invention, when the polyol is selected from a combination of pentaerythritol and trimethylolpropane, and the mass ratio of pentaerythritol to trimethylolpropane is controlled to be (0.4-18):1, the structure of the alkyd resin prepolymer is adjusted, which avoids the risk of gelation that may be caused by the subsequent acrylic grafting modification, and also effectively improves the water resistance of the alkyd resin coating.

[0041] 3. In this invention, the mass ratio of dicarboxylic acid to benzoic acid is controlled at (3-6):1, and the relative molecular mass of the alkyd resin prepolymer is adjusted to be moderate. After acrylic acid grafting modification, the prepared waterborne alkyd resin has a fast drying speed, high hardness, and the viscosity of the formed water dispersion is moderate. Detailed Implementation

[0042] Example 1

[0043] Example 1 provides a triphenyl phosphite-modified waterborne alkyd resin, the preparation method of which includes the following steps:

[0044] (1) Add 230g of soybean oil fatty acids, 20g of dehydrated ricinoleic acid, 62.23g of pentaerythritol, 62.23g of trimethylolpropane, 125.05g of phthalic anhydride, 22.20g of benzoic acid, 0.4g of dibutyltin oxide, 0.95g of triphenyl phosphite, and 35g of xylene to a reaction vessel. Turn on the heating and stirring, first raise the temperature to 165℃, and then slowly and uniformly raise the temperature to 240℃ over 3 hours for esterification. When the acid value reaches 8.5mgKOH / g, lower the temperature to 200℃ and remove xylene under vacuum.

[0045] (2) Cool down to 165℃, add 155g of ethylene glycol butyl ether, and then keep the temperature at 130℃;

[0046] (3) Mix 28.68g of methyl methacrylate, 7.55g of butyl acrylate, 49.73g of styrene, 20.15g of acrylic acid, 2.85g of benzoyl peroxide and 23.7g of ethylene glycol butyl ether to form a mixture, and add it dropwise at a uniform rate over 2.8h; then continue to add the mixture of 1.35g of di-tert-butyl peroxide and 10g of ethylene glycol butyl ether over 30min, and keep warm for 2h.

[0047] (4) Cool down to 85°C, add 33.5g of triethylamine, disperse and stir at high speed for 30min; cool down to 75°C, filter and discharge to obtain triphenyl phosphite modified waterborne alkyd resin.

[0048] The specific conversion between g and mass parts is that 1 part equals 10g.

[0049] Example 2

[0050] Example 2 provides a triphenyl phosphite-modified waterborne alkyd resin, the preparation method of which includes the following steps:

[0051] (1) Add 210g tall oil fatty acid, 40g dehydrated ricinoleic acid, 43.23g pentaerythritol, 82.95g trimethylolpropane, 127.05g phthalic anhydride, 28.43g benzoic acid, 0.4g dibutyltin oxide, 1.45g triphenyl phosphite, and 35g xylene to a reaction vessel, turn on heating and stirring, first raise the temperature to 165℃, and then slowly and uniformly raise the temperature to 240℃ over 3 hours for esterification; when the acid value reaches 8.0mgKOH / g, cool down to 200℃ and remove xylene under vacuum;

[0052] (2) Cool down to 165℃, add 155g of ethylene glycol butyl ether, and then keep the temperature at 140℃;

[0053] (3) Mix 38.38g of methyl methacrylate, 10.2g of butyl acrylate, 37.08g of styrene, 20.45g of acrylic acid, 2.80g of benzoyl peroxide and 23.7g of ethylene glycol butyl ether to form a mixture, and add it dropwise at a uniform rate over 2.8h; then continue to add the mixture of 1.15g of di-tert-butyl peroxide and 10g of ethylene glycol butyl ether over 30min, and keep warm for 2h.

[0054] (4) Cool down to 85°C, add 32.5g of triethylamine, disperse and stir at high speed for 30min; cool down to 75°C, filter and discharge to obtain triphenyl phosphite modified waterborne alkyd resin.

[0055] The specific conversion between g and mass parts is that 1 part equals 10g.

[0056] Example 3

[0057] Example 3 provides a triphenyl phosphite-modified waterborne alkyd resin, the preparation method of which includes the following steps:

[0058] (1) Add 256g of soybean oil fatty acids, 115.00g of pentaerythritol, 6.52g of trimethylolpropane, 125.65g of phthalic anhydride, 33.58g of benzoic acid, 0.4g of dibutyltin oxide, 0.95g of triphenyl phosphite, and 35g of xylene to a reaction vessel, turn on heating and stirring, first raise the temperature to 165℃, and then slowly and uniformly raise the temperature to 240℃ over 3 hours for esterification; when the acid value reaches 5.0mgKOH / g, cool down to 200℃ and remove xylene under vacuum;

[0059] (2) Cool down to 165℃, add 155g of ethylene glycol butyl ether, and then keep the temperature at 120℃;

[0060] (3) Mix 53.72g of methyl methacrylate, 28.69g of styrene, 24.09g of acrylic acid, 3.55g of benzoyl peroxide and 23.7g of ethylene glycol butyl ether to form a mixture, and add it dropwise at a uniform rate over 2.8h; then continue to add the mixture of 1.25g of di-tert-butyl peroxide and 10g of ethylene glycol butyl ether over 30min, and keep warm for 2h.

[0061] (4) Cool down to 85°C, add 24.8g of triethylamine and 7.5g of N,N-dimethylethanolamine, disperse and stir at high speed for 30min; cool down to 75°C, filter and discharge to obtain triphenyl phosphite modified waterborne alkyd resin.

[0062] The specific conversion between g and mass parts is that 1 part equals 10g.

[0063] Comparative Example 1

[0064] Comparative Example 1 provides a triphenyl phosphite-modified waterborne alkyd resin, the preparation method of which includes the following steps:

[0065] (1) Add 230g of soybean oil fatty acids, 20g of dehydrated ricinoleic acid, 62.23g of pentaerythritol, 62.23g of trimethylolpropane, 125.05g of phthalic anhydride, 22.20g of benzoic acid, 0.4g of dibutyltin oxide, 0.95g of hypophosphorous acid, and 35g of xylene to a reaction vessel, turn on heating and stirring, first raise the temperature to 165℃, and then slowly and uniformly raise the temperature to 240℃ over 3 hours for esterification; when the acid value reaches 8.9mgKOH / g, cool down to 200℃ and remove xylene under vacuum;

[0066] (2) Cool down to 165℃, add 155g of ethylene glycol butyl ether, and then keep the temperature at 130℃;

[0067] (3) Mix 28.68g of methyl methacrylate, 7.55g of butyl acrylate, 49.73g of styrene, 20.15g of acrylic acid, 2.85g of benzoyl peroxide and 23.7g of ethylene glycol butyl ether to form a mixture, and add it dropwise at a uniform rate over 2.8h; then continue to add the mixture of 1.35g of di-tert-butyl peroxide and 10g of ethylene glycol butyl ether over 30min, and keep warm for 2h.

[0068] (4) Cool down to 85°C, add 34.5g of triethylamine, disperse and stir at high speed for 30min; cool down to 75°C, filter and discharge to obtain triphenyl phosphite modified waterborne alkyd resin.

[0069] The specific conversion between g and mass parts is that 1 part equals 10g.

[0070] Comparative Example 2

[0071] Comparative Example 2 provides a triphenyl phosphite-modified waterborne alkyd resin, the preparation method of which includes the following steps:

[0072] (1) Add 230g of soybean oil fatty acids, 20g of dehydrated ricinoleic acid, 62.23g of pentaerythritol, 62.23g of trimethylolpropane, 125.05g of phthalic anhydride, 22.20g of benzoic acid, 0.4g of dibutyltin oxide, and 35g of xylene to a reaction vessel, turn on heating and stirring, first raise the temperature to 165℃, and then slowly and uniformly raise the temperature to 240℃ over 3 hours for esterification; when the acid value reaches 8.2mgKOH / g, cool down to 200℃ and remove xylene under vacuum;

[0073] (2) Cool down to 165℃, add 155g of ethylene glycol butyl ether, and then keep the temperature at 130℃;

[0074] (3) Mix 28.68g of methyl methacrylate, 7.55g of butyl acrylate, 49.73g of styrene, 20.15g of acrylic acid, 2.85g of benzoyl peroxide and 23.7g of ethylene glycol butyl ether to form a mixture, and add it dropwise at a uniform rate over 2.8h; then continue to add the mixture of 1.35g of di-tert-butyl peroxide and 10g of ethylene glycol butyl ether over 30min, and keep warm for 2h.

[0075] (4) Cool down to 85°C, add 32.8g of triethylamine, disperse and stir at high speed for 30min; cool down to 75°C, filter and discharge to obtain triphenyl phosphite modified waterborne alkyd resin.

[0076] The specific conversion between g and mass parts is that 1 part equals 10g.

[0077] Performance Testing: Varnishes were prepared using the triphenyl phosphite-modified waterborne alkyd resins obtained in Examples 1-3 and Comparative Examples 1-2, combined with a waterborne drier. The performance of the coating film after drying at room temperature for 7 days was tested. The waterborne drier was ADDITOL 4940N, used at 2.5% of the resin solids content.

[0078] Table 1:

[0079]

[0080]

[0081] According to the results in Table 1, Comparative Example 2, without the addition of antioxidant, achieved a resin color number of 10#. Comparative Example 1, with the addition of hypophosphite antioxidant, had a reaction time that was nearly 1.5 hours longer than that of triphenyl phosphite, and the water resistance of the final resin coating was also reduced. The resin color number of all formulations with added triphenyl phosphite antioxidant did not exceed 7#, and it did not affect the reaction progress during the resin synthesis process.

Claims

1. A triphenyl phosphite-modified waterborne alkyd resin, characterized in that, By weight, the raw materials are: 20-30 parts fatty acids, 10-20 parts polyols, 12-20 parts diacids, 2-6 parts benzoic acid, 0.02-0.08 parts catalyst, 0.05-0.15 parts triphenyl phosphite, 1.5-4.0 parts xylene, 18-25 parts cosolvent, 2-5 parts acrylic monomers, 0-15 parts acrylate monomers, 0.3-1.0 parts initiator, 3-6 parts neutralizing agent, and 0-15 parts styrene; The catalyst is selected from one or more combinations of dibutyltin oxide, monobutyltin oxide, zinc oxide, and tetrabutyl titanate; The polyol is a combination of pentaerythritol and trimethylolpropane in a mass ratio of (0.4~18):1; The mass ratio of the dicarboxylic acid to benzoic acid is (3~6):1; The preparation method of the triphenyl phosphite-modified waterborne alkyd resin includes the following steps: (1) Add fatty acids, polyols, dicarboxylic acids, benzoic acid, catalyst, triphenyl phosphite, and xylene into a reaction vessel, turn on heating and stirring, first raise the temperature to 160~170℃, and then slowly and uniformly raise the temperature to 220~240℃ over 2~4 hours for heat preservation esterification; react until the acid value is less than 10mgKOH / g, cool down to below 200℃, and remove xylene under vacuum; (2) Cool down to below the boiling point of the cosolvent, add 75-85 wt% cosolvent to fully dissolve and dilute, and then maintain the temperature at 110-150℃; (3) Mix acrylic monomers, acrylate monomers, styrene, initiator I and 11-13 wt% cosolvent to form a mixture, and add it dropwise at a constant rate over 2-4 hours; then add the remaining cosolvent and initiator II mixture dropwise over 0.4-0.6 hours, and continue to keep warm for 2-3 hours. (4) Cool down, add neutralizing agent, and disperse and stir at high speed for 20~40 min to obtain triphenyl phosphite modified waterborne alkyd resin.

2. The triphenyl phosphite-modified waterborne alkyd resin according to claim 1, characterized in that, The fatty acid is selected from one or more combinations of soybean oil acid, tall oil acid, and dehydrated ricinoleic acid.

3. The triphenyl phosphite-modified waterborne alkyd resin according to claim 1, characterized in that, The dicarboxylic acid is selected from one or more combinations of phthalic anhydride, maleic anhydride, isophthalic acid, and terephthalic acid.

4. The triphenyl phosphite-modified waterborne alkyd resin according to claim 1, characterized in that, The initiator includes initiator I and initiator II; initiator I is 0.2 to 0.5 parts by weight; initiator II is 0.1 to 0.5 parts by weight.

5. The triphenyl phosphite-modified waterborne alkyd resin according to claim 4, characterized in that, The initiator I is selected from one or more combinations of benzoyl peroxide, tert-butyl peroxy-2-ethylhexanoate, tert-butyl peroxybenzoate, di-tert-butyl peroxybenzoate, and di-tert-pentyl peroxybenzoate; the initiator II is one or more combinations of tert-butyl peroxybenzoate, di-tert-butyl peroxybenzoate, and di-tert-pentyl peroxybenzoate.

6. A method for preparing a triphenyl phosphite-modified waterborne alkyd resin according to claim 5, characterized in that, Includes the following steps: (1) Add fatty acids, polyols, dicarboxylic acids, benzoic acid, catalyst, triphenyl phosphite, and xylene into a reaction vessel, turn on heating and stirring, first raise the temperature to 160~170℃, and then slowly and uniformly raise the temperature to 220~240℃ over 2~4 hours for heat preservation esterification; react until the acid value is less than 10mgKOH / g, cool down to below 200℃, and remove xylene under vacuum; (2) Cool down to below the boiling point of the cosolvent, add 75-85 wt% cosolvent to fully dissolve and dilute, and then maintain the temperature at 110-150℃; (3) Mix acrylic monomers, acrylate monomers, styrene, initiator I and 11-13 wt% cosolvent to form a mixture, and add it dropwise at a constant rate over 2-4 hours; then add the remaining cosolvent and initiator II mixture dropwise over 0.4-0.6 hours, and continue to keep warm for 2-3 hours. (4) Cool down, add neutralizing agent, and disperse and stir at high speed for 20~40 min to obtain triphenyl phosphite modified waterborne alkyd resin.

7. An application of a triphenyl phosphite-modified waterborne alkyd resin according to any one of claims 1 to 5, characterized in that, Used in the preparation of coatings.

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