1. The water-based epoxy ester-acrylic hybrid resin is characterized by being prepared from the following raw materials in parts by mass:

15-35 parts of fatty acid modified acrylic prepolymer, 15-35 parts of epoxy ester, 5-12 parts of solvent, 1-5 parts of neutralizer and 35-55 parts of water.

2. The aqueous epoxy ester-acrylic hybrid resin as claimed in claim 1, wherein the fatty acid modified acrylic prepolymer is prepared from the following raw materials in parts by mass: 10-35 parts of fatty acid, 35-85 parts of (methyl) acrylic acid and ester monomers thereof, 5-25 parts of vinyl monomers, 1-15 parts of double-bond-containing anhydride or dibasic acid, 10-30 parts of solvent, 0.5-5 parts of initiator and 0.1-1 part of chain transfer agent;

the epoxy ester is prepared from the following raw materials in parts by mass: 20-80 parts of fatty acid, 20-80 parts of epoxy resin, 0.1-1 part of antioxidant and 0.1-1 part of catalyst;

the solvent is one or more of ethylene glycol butyl ether, propylene glycol methyl ether, propylene glycol butyl ether, xylene, S100 solvent, n-butanol and isopropanol;

the neutralizing agent is one or more of triethylamine, ammonia water and dimethylethanolamine.

3. The aqueous epoxy ester-acrylic hybrid resin as claimed in claim 2, wherein the fatty acid is one or more of isooctanoic acid, neodecanoic acid, soya oleic acid, tall oil fatty acid, stearic acid, palmitic acid and oleic acid.

4. The waterborne epoxy ester-acrylic hybrid resin as claimed in claim 2, wherein the (meth) acrylic acid and ester monomers thereof are isooctyl acrylate, acrylic acid, isobornyl acrylate, n-butyl acrylate, methyl acrylate, ethyl acrylate, n-octyl acrylate, ethoxyethoxyethyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, methyl methacrylate, methacrylic acid, isobutyl methacrylate, octadecyl methacrylate, acetoacetoxy methacrylate, glycidyl methacrylate, cyclohexyl methacrylate, benzyl methacrylate, isooctyl methacrylate, gamma-methacryloxypropyltriisopropoxysilane, gamma-methacryloxypropyltrimethoxysilane, methyl methacrylate, ethyl acrylate, n-octyl acrylate, ethoxyethoxyethoxyethyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, methyl methacrylate, isobutyl methacrylate, octadecyl methacrylate, acetoacetoxy methacrylate, glycidyl methacrylate, cyclohexyl methacrylate, benzyl methacrylate, isooctyl methacrylate, gamma-methacryloxypropyltriisopropoxysilane, gamma-methacryloxypropyltrimethoxysilane, and mixtures thereof, One or more of gamma-methacryloxypropyltriethoxysilane and lauryl methacrylate.

5. The aqueous epoxy ester-acrylic hybrid resin as claimed in claim 2, wherein the vinyl monomer is one or more of styrene, alpha-methyl styrene, vinyl versatate, vinyl trimethoxy silane, vinyl triethoxy silane and vinyl triisopropoxy silane;

the double-bond-containing anhydride or dibasic acid is one or more of maleic anhydride, tetrahydrophthalic anhydride, maleic acid, maleic anhydride, fumaric acid and itaconic acid.

6. The aqueous epoxy ester-acrylic hybrid resin as claimed in claim 2, wherein the initiator is one or more of tert-butyl peroxybenzoate, di-tert-amyl peroxide, dibenzoyl peroxide, di-tert-butyl peroxide, azobisisobutyronitrile; the chain transfer agent is dodecyl mercaptan.

7. The water-based epoxy ester-acrylic hybrid resin as claimed in claim 2, wherein the antioxidant is triphenyl phosphite or hypophosphorous acid; the catalyst is titanate or triphenylphosphine.

8. The preparation method of the water-based epoxy ester-acrylic hybrid resin as claimed in any one of claims 1 to 7, comprising the steps of:

mixing the fatty acid modified acrylic prepolymer and epoxy ester, heating to 140-160 ℃ for esterification, continuing to heat to 180-220 ℃, ending the reaction when the acid value is 20-50 mgKOH/g, cooling to 120-160 ℃, adding a solvent, continuing to cool to 110-120 ℃, adding a neutralizer, and then adding water for dilution to obtain the water-based epoxy ester-acrylic hybrid resin.

9. The preparation method of the water-based epoxy ester-acrylic hybrid resin as claimed in claim 8, wherein the preparation method of the fatty acid modified acrylic prepolymer comprises the following steps:

mixing fatty acid, (methyl) acrylic acid and ester monomers thereof, vinyl monomers, double-bond-containing acid anhydride or dibasic acid and an initiator, dripping the mixture into a solvent in multiple steps, and reacting at constant temperature for 1-3 hours after finishing dripping to obtain a fatty acid modified acrylic prepolymer; wherein the dripping time is 3-9 h, and the temperature is 110-150 ℃ in the dripping process;

the preparation method of the epoxy ester comprises the following steps:

mixing fatty acid, epoxy resin, an antioxidant and a catalyst, heating to 120-180 ℃ in a nitrogen atmosphere, reacting at a constant temperature until the acid value is less than 2mg KOH/g, cooling, diluting and discharging to obtain the epoxy ester.

10. The application of the waterborne epoxy ester-acrylic hybrid resin prepared by any one of claims 8 to 9 in the field of baking paint.

Background

With the development of industry, the problem of environmental pollution is more and more troubling human beings, so the development of environment-friendly coatings is a great trend. The fundamental approach to solve the problem of environmental pollution from coatings is to develop solventless coatings, water-borne coatings, powder coatings and high solids coatings. With the enhancement of environmental awareness and the stricter environmental regulations, the water-based paint has become one of the main development directions of the environmental-friendly paint, and the water-based paint reduces the environmental pollution because all or most of water replaces the organic solvent.

Nevertheless, the performance of the water-based resin prepared by a single structure is far inferior to that of the solvent-based resin, so that two or more resins with different structures can be organically combined by a hybridization means, and the advantages of the components are complemented to improve the overall performance (such as adhesion, water resistance, corrosion resistance and the like) of the water-based paint. The hybrid resin is generally prepared by methods such as blending, copolymerization, grafting and the like. In the aspect of hybrid polymerization, although blending of two water-based resins is the most convenient method, the performance of the water-based copolymerized hybrid resin is far above that, and the method is the main flow direction for modifying the water-based coating resin.

The epoxy ester resin combined by the fatty acid and the epoxy resin combines the advantages of the alkyd resin and the epoxy resin, and a coating film of the epoxy ester resin has room-temperature self-crosslinking performance, excellent corrosion resistance, adhesive force and pigment wetting performance, is an important film-forming substance of an anticorrosive coating, and has the defects of poor weather resistance and the like. The water-based acrylic resin has the characteristics of light color, high transparency, brightness, fullness, excellent color retention, good weather resistance and the like.

Therefore, how to provide a waterborne epoxy ester-acrylic hybrid resin and a preparation method thereof, which enable the product to have excellent corrosion resistance and weather resistance, is a technical problem to be solved in the field.

Disclosure of Invention

The invention aims to provide a water-based epoxy ester-acrylic hybrid resin and a preparation method thereof, and solves the problem that the performance of the water-based resin prepared by the existing single structure is far inferior to that of solvent-type resin.

In order to achieve the above object, the present invention provides the following technical solutions:

the invention provides a water-based epoxy ester-acrylic hybrid resin which is prepared from the following raw materials in parts by mass:

15-35 parts of fatty acid modified acrylic prepolymer, 15-35 parts of epoxy ester, 5-12 parts of solvent, 1-5 parts of neutralizer and 35-55 parts of water;

the fatty acid modified acrylic prepolymer is prepared from the following raw materials in parts by weight: 10-35 parts of fatty acid, 35-85 parts of (methyl) acrylic acid and ester monomers thereof, 5-25 parts of vinyl monomers, 1-15 parts of double-bond-containing anhydride or dibasic acid, 10-30 parts of solvent, 0.5-5 parts of initiator and 0.1-1 part of chain transfer agent;

preferably, the epoxy ester is prepared from the following raw materials in parts by mass: 20-80 parts of fatty acid, 20-80 parts of epoxy resin, 0.1-1 part of antioxidant and 0.1-1 part of catalyst;

preferably, the solvent is one or more of ethylene glycol butyl ether, propylene glycol methyl ether, propylene glycol butyl ether, xylene, S100 solvent, n-butanol and isopropanol;

preferably, the neutralizing agent is one or more of triethylamine, ammonia water and dimethylethanolamine.

Preferably, the fatty acid is one or more of isooctanoic acid, neodecanoic acid, stearic acid, palmitic acid, soya oleic acid, tall oil fatty acid and oleic acid.

Preferred (meth) acrylic acid and its ester monomers are isooctyl acrylate, acrylic acid, isobornyl acrylate, n-butyl acrylate, methyl acrylate, ethyl acrylate, n-octyl acrylate, ethoxyethoxyethyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, methyl methacrylate, one or more of methacrylic acid, isobutyl methacrylate, stearyl methacrylate, acetoacetoxy methacrylate, glycidyl methacrylate, cyclohexyl methacrylate, benzyl methacrylate, isooctyl methacrylate, gamma-methacryloxypropyl triisopropoxysilane, gamma-methacryloxypropyl trimethoxysilane, gamma-methacryloxypropyl triethoxysilane, and lauryl methacrylate.

Preferably, the vinyl monomer is one or more of styrene, alpha-methylstyrene, vinyl versatate, vinyltrimethoxysilane, vinyltriethoxysilane, and vinyltriisopropoxysilane.

Preferably, the double bond-containing anhydride or diacid is one or more of maleic anhydride, tetrahydrophthalic anhydride, maleic acid, maleic anhydride, fumaric acid, and itaconic acid.

Preferably, the initiator is one or more of tert-butyl peroxybenzoate, di-tert-amyl peroxide, dibenzoyl peroxide, di-tert-butyl peroxide and azobisisobutyronitrile; the chain transfer agent is dodecyl mercaptan.

Preferably, the molecular weight of the epoxy resin is between 390-4000.

Preferably, the antioxidant is triphenyl phosphite or hypophosphorous acid;

preferably, the catalyst is a titanate or triphenylphosphine.

The invention also provides a preparation method of the water-based epoxy ester-acrylic hybrid resin, which comprises the following steps:

mixing the fatty acid modified acrylic prepolymer and epoxy ester, heating to 140-160 ℃ for esterification, continuing to heat to 180-220 ℃, ending the reaction when the acid value is 20-50 mgKOH/g, cooling to 120-160 ℃, adding a solvent, continuing to cool to 110-120 ℃, adding a neutralizer, and then adding water for dilution to obtain the water-based epoxy ester-acrylic hybrid resin; wherein the solid mass of the water-based epoxy ester-acrylic hybrid resin is 30-50%.

Preferably, the fatty acid-modified acrylic prepolymer is prepared as follows:

mixing fatty acid, (methyl) acrylic acid and ester monomers thereof, vinyl monomers, double-bond-containing acid anhydride or dibasic acid and an initiator, dripping the mixture into a solvent in multiple steps, and reacting at constant temperature for 1-3 hours after finishing dripping to obtain a fatty acid modified acrylic prepolymer;

wherein the dripping time is 3-9 h, and the temperature is 110-150 ℃ in the dripping process.

Preferably, the preparation of the epoxy ester is as follows:

mixing fatty acid, epoxy resin, an antioxidant and a catalyst, heating to 120-180 ℃ in a nitrogen atmosphere, reacting at a constant temperature until the acid value is less than 2mg KOH/g, cooling, diluting and discharging to obtain the epoxy ester.

Preferably, the fatty acid-modified acrylic prepolymer is an anhydride-or carboxyl-rich fatty acid-modified acrylic prepolymer.

The invention also provides application of the water-based epoxy ester-acrylic hybrid resin in the field of baking finish.

Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:

(1) the water-based epoxy ester-acrylic acid hybrid resin is water-based acrylic acid modified epoxy ester, does not contain a surfactant, is neutralized by carboxyl groups carried by the hybrid resin and then is dispersed in water, and has excellent water resistance and salt spray resistance.

(2) According to the invention, fatty acid modified acrylic resin is introduced into epoxy ester, so that the compatibility of the waterborne epoxy ester-acrylic hybrid resin is improved.

(3) The epoxy ester acrylic hybrid resin of the invention introduces chemical covalent bonds which have high bond energy and are difficult to break, such as carbon-carbon bonds, carbon-oxygen bonds and the like, on the molecular structure, thereby improving the heat storage capacity of the hybrid resin.

(4) The waterborne epoxy ester-acrylic hybrid resin disclosed by the invention combines excellent corrosion resistance and decorative property of epoxy ester and acrylic acid, has excellent decorative property, and also has excellent protection on a steel substrate, for example, the salt spray resistance of a paint film exceeds 240 h. The gloss and the fullness of a paint film take the advantages of epoxy ester and acrylic resin into account, and when the color ratio is 1.2: at 1, 60 ° gloss can reach 90 or more.

(5) Coatings prepared from waterborne epoxy ester-acrylic hybrid resins are suitable for use in large-scale industrial and residential coatings, such as: steel structure coating, agricultural mechanical coating, metal mechanical part coating, woodenware coating, indoor water pipe coating and the like.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a salt spray resistance chart of amino baking varnish prepared by embodiments 8-10 of the present invention after 240h salt spray test.

FIG. 2 is a Bode diagram showing the electrochemical impedance of amino baking varnish prepared by using the waterborne epoxy ester-acrylic hybrid resin prepared in the embodiments 8-10 of the present invention as a film forming material after being soaked in a 5.0% NaCl solution for 48 hours.

Detailed Description

The invention provides a water-based epoxy ester-acrylic hybrid resin which is prepared from the following raw materials in parts by mass:

15-35 parts of fatty acid modified acrylic prepolymer, 15-35 parts of epoxy ester, 5-12 parts of solvent, 1-5 parts of neutralizer and 35-55 parts of water; preferably 20-30 parts of fatty acid modified acrylic prepolymer, 18-25 parts of epoxy ester, 8-12 parts of solvent, 2-4 parts of neutralizer and 35-42 parts of water; more preferably 27.6 parts of fatty acid-modified acrylic prepolymer, 20 parts of epoxy ester, 10 parts of solvent, 2 parts of neutralizer and 38 parts of water.

The fatty acid modified acrylic prepolymer is prepared from the following raw materials in parts by weight: 10-35 parts of fatty acid, 35-85 parts of (methyl) acrylic acid and ester monomers thereof, 5-25 parts of vinyl monomers, 1-15 parts of double-bond-containing anhydride or dibasic acid, 10-30 parts of solvent, 0.5-5 parts of initiator and 0.1-1 part of chain transfer agent; preferably 15-25 parts of fatty acid, 40-80 parts of (methyl) acrylic acid and ester monomers thereof, 15-23 parts of vinyl monomers, 4-7 parts of double-bond-containing anhydride or dibasic acid, 20-25 parts of solvent, 4-5 parts of initiator and 0.5-8 parts of chain transfer agent; more preferably 21 parts of fatty acid, 80 parts of (meth) acrylic acid and ester monomers thereof, 20 parts of vinyl monomers, 5 parts of double bond-containing acid anhydride or dibasic acid, 23.5 parts of solvent, 4.24 parts of initiator and 0.7 part of chain transfer agent.

In the invention, the epoxy ester is prepared from the following raw materials in parts by mass: 20-80 parts of fatty acid, 20-80 parts of epoxy resin, 0.1-1 part of antioxidant and 0.1-1 part of catalyst, preferably 40-80 parts of fatty acid, 30-40 parts of epoxy resin, 0.4-0.7 part of antioxidant and 0.1-0.5 part of catalyst; more preferably 62.5 parts of fatty acid, 35.75 parts of epoxy resin, 0.5 part of antioxidant and 0.2 part of catalyst.

In the invention, the solvent is one or more of ethylene glycol butyl ether, propylene glycol methyl ether, propylene glycol butyl ether, xylene, S100 solvent, n-butanol and isopropanol; preferred are xylene, S100 solvent, n-butanol, and ethylene glycol butyl ether.

In the present invention, the neutralizing agent is one or more of triethylamine, ammonia water and dimethylethanolamine, and dimethylethanolamine is preferable.

In the present invention, the fatty acid is one or more of isooctanoic acid, neodecanoic acid, stearic acid, palmitic acid, soya oleic acid, tall oil fatty acid and oleic acid; preferably soya-bean oil acid and oleic acid.

In the invention, the (meth) acrylic acid and the ester monomer thereof are isooctyl acrylate, acrylic acid, isobornyl acrylate, n-butyl acrylate, methyl acrylate, ethyl acrylate, n-octyl acrylate, ethoxyethoxyethyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate and methyl methacrylate, one or more of methacrylic acid, isobutyl methacrylate, stearyl methacrylate, acetoacetoxy methacrylate, glycidyl methacrylate, cyclohexyl methacrylate, benzyl methacrylate, isooctyl methacrylate, gamma-methacryloxypropyl triisopropoxysilane, gamma-methacryloxypropyl trimethoxysilane, gamma-methacryloxypropyl triethoxysilane, and lauryl methacrylate.

In the invention, the vinyl monomer is one or more of styrene, alpha-methyl styrene, vinyl versatate, vinyl trimethoxy silane, vinyl triethoxy silane and vinyl triisopropoxy silane; styrene and vinyl versatate are preferred.

In the invention, the double bond-containing anhydride or dibasic acid is one or more of maleic anhydride, tetrahydrophthalic anhydride, maleic acid, maleic anhydride, fumaric acid and itaconic acid, and maleic anhydride and fumaric acid are preferred.

In the invention, the initiator is one or more of tert-butyl peroxybenzoate, di-tert-amyl peroxide, dibenzoyl peroxide, di-tert-butyl peroxide and azobisisobutyronitrile.

In the present invention, the chain transfer agent is dodecyl mercaptan.

In the invention, the molecular weight of the epoxy resin is 390-4000.

In the invention, the antioxidant is triphenyl phosphite or hypophosphorous acid.

In the present invention, the catalyst is titanate or triphenylphosphine.

The invention also provides a preparation method of the water-based epoxy ester-acrylic hybrid resin, which comprises the following steps:

mixing the fatty acid modified acrylic prepolymer and epoxy ester, heating to 140-160 ℃ for esterification, continuing to heat to 180-220 ℃, ending the reaction when the acid value is 20-50 mgKOH/g, cooling to 120-160 ℃, adding a solvent, continuing to cool to 110-120 ℃, adding a neutralizer, and then adding water for dilution to obtain the water-based epoxy ester-acrylic hybrid resin; wherein the solid mass of the water-based epoxy ester-acrylic hybrid resin is 30-50%.

In the present invention, the fatty acid-modified acrylic prepolymer is prepared as follows:

mixing fatty acid, (methyl) acrylic acid and ester monomers thereof, vinyl monomers, double-bond-containing acid anhydride or dibasic acid and an initiator, dripping the mixture into a solvent in multiple steps, and reacting at constant temperature for 1-3 hours after finishing dripping to obtain a fatty acid modified acrylic prepolymer;

wherein the dripping time is 3-9 h, and the temperature is 110-150 ℃ in the dripping process.

In the present invention, the preparation method of the epoxy ester is as follows:

mixing fatty acid, epoxy resin, an antioxidant and a catalyst, heating to 120-180 ℃ in a nitrogen atmosphere, reacting at a constant temperature until the acid value is less than 2mg KOH/g, cooling, diluting and discharging to obtain the epoxy ester.

In the present invention, the fatty acid-modified acrylic prepolymer is a fatty acid-modified acrylic prepolymer rich in an acid anhydride or a carboxyl group.

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

The invention provides a preparation method of a water-based epoxy ester-acrylic hybrid resin, which comprises the following steps:

(1) the preparation of epoxy ester, its raw material composition and compounding ratio are shown in table 1.

The preparation method comprises the following steps: adding raw materials into a clean reaction kettle, heating to 120 ℃, measuring the acid value every other hour until the acid value is reduced to 1mg KOH/g, cooling, and discharging to obtain the epoxy ester.

TABLE 1 raw materials composition and compounding ratio of epoxy ester

(2) The preparation of the fatty acid modified acrylic prepolymer, the raw material solute composition and the ratio thereof are shown in table 2.

The preparation method comprises the following steps: xylene with the total mass of 18% serves as a kettle bottom solvent, the components in the table 2 are divided into two mixed monomers, wherein the first mixed monomer must contain maleic anhydride but no (meth) acrylic acid and ester monomers thereof, the second mixed monomer must contain (meth) acrylic acid and ester monomers thereof but no maleic anhydride, and the mixed monomers are dripped into a reaction kettle in two steps at the temperature of 132 ℃ (the first mixed monomer is dripped first, and then the second mixed monomer is dripped), and the dripping time is 6 hours. After the dropwise addition, reacting at a constant temperature of 132 ℃ for 2h, cooling and discharging to obtain the fatty acid modified acrylic prepolymer.

TABLE 2 raw material composition and compounding ratio of fatty acid-modified acrylic prepolymer

(3) The raw material composition and the mixture ratio of the preparation of the waterborne epoxy ester-acrylic hybrid resin are shown in table 3.

The preparation method comprises the following steps: adding the fatty acid modified acrylic prepolymer and epoxy ester into a reaction kettle, mixing, heating to 150 ℃, preserving heat for 30min, heating to 200 ℃, preserving heat until the acid value is 30mg KOH/g, and adding ethylene glycol monobutyl ether and n-butyl alcohol. And then cooling to 120 ℃, adding dimethylethanolamine, and then adding water to dilute until the solid content is 40% to obtain the water-based epoxy ester-acrylic acid hybrid resin.

TABLE 3 raw material composition and compounding ratio of water-based epoxy ester-acrylic hybrid resin

(4) The raw material composition and the mixture ratio of the amino baking varnish prepared by using the waterborne epoxy ester-acrylic hybrid resin as a film forming material are shown in table 4.

The preparation method comprises the following steps: adding the hybrid dispersion prepared in the embodiment of the invention into a dispersion tank, dispersing at a low speed of 650rpm, then sequentially adding DPNB and PNB, adjusting the pH to 8-9 by using DMEA, and dispersing for 5 minutes. And then adding 325 amino resin, epoxy phosphate and closed isocyanate, adjusting the speed of a dispersion machine to 900rpm, continuing for 5 minutes, finally adding a defoaming agent, a leveling agent, a wetting agent, an anti-flash rust agent and deionized water in sequence, and dispersing the coating for 8 minutes to obtain the amino baking varnish taking the water-based epoxy ester-acrylic hybrid resin as a film forming material.

TABLE 4 composition and ratio of amino baking varnish as film-forming material of water-based epoxy ester-acrylic hybrid resin

Example 2

(1) The preparation of epoxy ester, its raw material composition and formulation are shown in table 5.

(2) Preparation of fatty acid modified acrylic acid: the same as in example 1.

(3) Preparation of aqueous epoxy ester-acrylic hybrid resin: the same as in example 1.

(1) The preparation of epoxy ester, its raw material composition and compounding ratio are shown in table 1.

The preparation method comprises the following steps: adding raw materials into a clean reaction kettle, heating to 120 ℃, measuring the acid value every other hour until the acid value is reduced to 1mg KOH/g, cooling, and discharging to obtain the epoxy ester.

TABLE 5 raw material composition and compounding ratio of epoxy ester

(4) The preparation of amino baking varnish using water-based epoxy ester-acrylic hybrid resin as a film forming material comprises the following steps: the same as in example 1.

Example 3

(1) The preparation of epoxy ester, its raw material composition and formulation are shown in table 6.

(2) Preparation of fatty acid modified acrylic acid: the same as in example 1.

(3) Preparation of aqueous epoxy ester-acrylic hybrid resin: the same as in example 1.

(1) The preparation of epoxy ester, its raw material composition and compounding ratio are shown in table 1.

The preparation method comprises the following steps: adding raw materials into a clean reaction kettle, heating to 120 ℃, measuring the acid value every other hour until the acid value is reduced to 1mg KOH/g, cooling, and discharging to obtain the epoxy ester.

TABLE 6 raw material composition and compounding ratio of epoxy ester

(4) The preparation of amino baking varnish using water-based epoxy ester-acrylic hybrid resin as a film forming material comprises the following steps: the same as in example 1.

Example 4

(1) Preparation of epoxy ester: the same as in example 1.

(2) The raw material composition and the compounding ratio of the fatty acid-modified acrylic acid are shown in table 7.

(3) Preparation of aqueous epoxy ester-acrylic hybrid resin: the same as in example 1.

The preparation of the fatty acid-modified acrylic prepolymer, the raw material solute composition and the compounding ratio thereof are shown in table 7.

The preparation method comprises the following steps: xylene with the total mass of 18% is used as a kettle bottom solvent, other components in the table 2 are uniformly mixed, and then the mixture is dripped into a reaction kettle at the temperature of 132 ℃, and the dripping time is 6 hours. After the dropwise addition, reacting at a constant temperature of 132 ℃ for 2h, cooling and discharging to obtain the fatty acid modified acrylic prepolymer.

TABLE 7 raw material composition and compounding ratio of fatty acid-modified acrylic prepolymer

(4) The preparation of amino baking varnish using water-based epoxy ester-acrylic hybrid resin as a film forming material comprises the following steps: the same as in example 1.

Example 5

(1) Preparation of epoxy ester: the same as in example 1.

(2) The raw material composition and the compounding ratio of the fatty acid-modified acrylic acid are shown in table 8.

(3) Preparation of aqueous epoxy ester-acrylic hybrid resin: the same as in example 1.

The preparation of the fatty acid-modified acrylic prepolymer, the raw material solute composition and the compounding ratio thereof are shown in table 8.

The preparation method comprises the following steps: xylene with the total mass of 18% is used as a kettle bottom solvent, other components in the table 2 are uniformly mixed, and then the mixture is dripped into a reaction kettle at the temperature of 132 ℃, and the dripping time is 6 hours. After the dropwise addition, reacting at a constant temperature of 132 ℃ for 2h, cooling and discharging to obtain the fatty acid modified acrylic prepolymer.

TABLE 8 raw material composition and compounding ratio of fatty acid-modified acrylic prepolymer

(4) The preparation of amino baking varnish using water-based epoxy ester-acrylic hybrid resin as a film forming material comprises the following steps: the same as in example 1.

Example 6

(1) Preparation of epoxy ester: the same as in example 1.

(2) Preparation of fatty acid modified acrylic acid: the same as in example 1.

(3) The raw material composition and the mixture ratio of the preparation of the waterborne epoxy ester-acrylic hybrid resin are shown in table 9.

The preparation method comprises the following steps: adding the fatty acid modified acrylic prepolymer and epoxy ester into a reaction kettle, mixing, heating to 150 ℃, preserving heat for 30min, heating to 190 ℃, preserving heat until the acid value is 35mg KOH/g, and adding ethylene glycol monobutyl ether and n-butyl alcohol. And then cooling to 120 ℃, adding dimethylethanolamine, and then adding water to dilute until the solid content is 40% to obtain the water-based epoxy ester-acrylic acid hybrid resin.

TABLE 9 raw Material composition and compounding ratio of aqueous epoxy ester-acrylic hybrid resin

(4) The preparation of amino baking varnish using water-based epoxy ester-acrylic hybrid resin as a film forming material comprises the following steps: the same as in example 1.

Example 7

(1) Preparation of epoxy ester: the same as in example 1.

(2) Preparation of fatty acid modified acrylic acid: the same as in example 1.

(3) Preparation of aqueous epoxy ester-acrylic hybrid resin: the raw material composition and the compounding ratio are shown in table 10.

The preparation method comprises the following steps: adding the fatty acid modified acrylic prepolymer and epoxy ester into a reaction kettle, mixing, heating to 150 ℃, preserving heat for 30min, heating to 200 ℃, preserving heat until the acid value is 30mg KOH/g, and adding ethylene glycol monobutyl ether and n-butyl alcohol. And then cooling to 120 ℃, adding dimethylethanolamine, and then adding water to dilute until the solid content is 40% to obtain the water-based epoxy ester-acrylic acid hybrid resin.

TABLE 10 raw material composition and compounding ratio of water-based epoxy ester-acrylic hybrid resin

(4) The preparation of amino baking varnish using water-based epoxy ester-acrylic hybrid resin as a film forming material comprises the following steps: the same as in example 1.

Example 8

The invention provides a preparation method of a water-based epoxy ester-acrylic hybrid resin, which comprises the following steps:

(1) the base epoxy ester was prepared according to the same method as in example 1.

(2) The raw material solute composition and the compounding ratio of the fatty acid-modified acrylic prepolymer are shown in table 11.

The preparation method comprises the following steps: xylene with the total mass of 18% is used as a kettle bottom solvent, the components in table 11 are divided into two mixed monomers, wherein the first mixed monomer must contain fumaric acid but no (meth) acrylic acid and ester monomers thereof, the second mixed monomer must contain (meth) acrylic acid and ester monomers thereof but no fumaric acid, and the mixed monomers are dripped into the reaction kettle in two steps at 132 ℃ (the first mixed monomer is dripped first, and then the second mixed monomer is dripped), and the dripping time is 6 hours. After the dropwise addition, reacting at a constant temperature of 132 ℃ for 2h, cooling and discharging to obtain the fatty acid modified acrylic prepolymer.

TABLE 11 raw material solute composition and compounding ratio of fatty acid modified acrylic prepolymer

(3) The raw material composition and the mixture ratio of the preparation of the waterborne epoxy ester-acrylic hybrid resin are shown in table 12.

The preparation method comprises the following steps: putting the fatty acid modified acrylic prepolymer and epoxy ester into a reaction kettle, mixing, heating to 150 ℃, preserving heat for 30min, heating to 200 ℃, preserving heat until the acid value is 30mg KOH/g, and adding butyl cellosolve and S100. And then cooling to 120 ℃, adding dimethylethanolamine, and then adding water to dilute until the solid content is 40% to obtain the water-based epoxy ester-acrylic acid hybrid resin.

TABLE 12 raw material composition and compounding ratio of water-based epoxy ester-acrylic hybrid resin

(4) The raw material composition and the mixture ratio of the amino baking varnish prepared by using the waterborne epoxy ester-acrylic hybrid resin as a film forming material are shown in Table 13.

The preparation method comprises the following steps: the hybrid dispersion prepared by the embodiment of the invention is added into a mixing tank, and is dispersed at a low speed of 600-700 rpm, then DPNB and PNB are sequentially added, the pH is adjusted to 8-9 by DMEA, and the dispersion is carried out for 5 minutes. And then adding 325 amino resin, epoxy phosphate and closed isocyanate, adjusting the speed of a dispersion machine to 800rpm, continuing for 5 minutes, finally adding a defoaming agent, a leveling agent, a wetting agent, an anti-flash rust agent and deionized water in sequence, and dispersing the coating for 8 minutes to obtain the amino baking varnish taking the water-based epoxy ester-acrylic acid hybrid resin as a film forming material.

TABLE 13 composition and ratio of amino baking varnish as film-forming material of water-based epoxy ester-acrylic hybrid resin

Example 9

(1) Preparation of epoxy ester: the same as in example 8.

(2) Preparation of fatty acid modified acrylic acid: the same as in example 8.

(3) The raw material composition and the mixture ratio of the preparation of the waterborne epoxy ester-acrylic hybrid resin are shown in table 14.

The preparation method comprises the following steps: putting the fatty acid modified acrylic prepolymer and epoxy ester into a reaction kettle, mixing, heating to 150 ℃, preserving heat for 30min, heating to 220 ℃, preserving heat until the acid value is 50mg KOH/g, and adding ethylene glycol monobutyl ether and S100. And then cooling to 120 ℃, adding dimethylethanolamine, and then adding water to dilute until the solid content is 40% to obtain the water-based epoxy ester-acrylic acid hybrid resin.

TABLE 14 raw material composition and compounding ratio of water-based epoxy ester-acrylic hybrid resin

(4) The preparation of amino baking varnish using water-based epoxy ester-acrylic hybrid resin as a film forming material comprises the following steps: the same as in example 4.

Example 10

(1) Preparation of epoxy ester: the same as in example 8.

(2) Preparation of fatty acid modified acrylic acid: the same as in example 8.

(3) The raw material composition and the mixture ratio of the preparation of the waterborne epoxy ester-acrylic hybrid resin are shown in table 15.

The preparation method comprises the following steps: putting the fatty acid modified acrylic prepolymer and epoxy ester into a reaction kettle, mixing, heating to 150 ℃, preserving heat for 30min, heating to 180 ℃, preserving heat until the acid value is 20mg KOH/g, and adding butyl cellosolve and S100. And then cooling to 120 ℃, adding dimethylethanolamine, and then adding water to dilute until the solid content is 40% to obtain the water-based epoxy ester-acrylic acid hybrid resin.

TABLE 15 raw material composition and compounding ratio of water-based epoxy ester-acrylic hybrid resin

(4) The preparation of amino baking varnish using water-based epoxy ester-acrylic hybrid resin as a film forming material comprises the following steps: the same as in example 4.

Comparative example 1

The hybrid resin prepared in example 1 was replaced with a commercially available YG-EE672 resin, diluted to 40% solids, and then a film-forming amino baking varnish was prepared, the other components and the preparation process were the same as in example 1.

Comparative example 2

The preparation of the film-forming amino baking varnish was carried out using a commercially available YG-EE640 resin instead of the hybrid resin prepared in example 8, and the other components and preparation process were the same as in example 8.

The properties of the baking varnishes prepared according to examples 1, 8, 1 and 2 of the present invention were measured according to the standard HG/T2594-94, and the results are shown in Table 12.

TABLE 12 paint film property test results of some examples of the invention

As can be seen from Table 12, after the waterborne epoxy ester-acrylic hybrid resin is prepared into a coating, a paint film has excellent water resistance, and the immersion time in water can reach more than 60 days. The water-based epoxy ester-acrylic hybrid resin can reach 288h in the aspect of salt spray resistance, and has the characteristic of high light.

Experimental example 1

The amino baking varnish of the waterborne epoxy ester-acrylic acid hybrid resin film-forming material prepared in the embodiments 8 to 10 of the invention is coated on an iron sheet to be subjected to a salt spray test, two scratches (damage to a coating film) are scratched on the coated surface before the test, the test time is 240 hours, and the test result is shown in fig. 1 (three test elements in fig. 1 correspond to the embodiments 8 to 10 in sequence from left to right). The scratches showed obvious corrosion, while the coating was intact, indicating that examples 8-10 of the present invention have excellent corrosion resistance.

The results of measuring the electrochemical impedance of examples 8 to 10 after being immersed in a 5.0% NaCl solution for 48 hours are shown in FIG. 2. As can be seen from FIG. 2, the coating prepared in example 8 has a modulus of resistance value higher than 10⁸Omega, the coating has good barrier property to corrosive media.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.