CN111253560A - Epoxy ester modified waterborne alkyd resin and preparation method thereof - Google Patents
Epoxy ester modified waterborne alkyd resin and preparation method thereof Download PDFInfo
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- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
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- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
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Abstract
The invention provides an epoxy ester modified waterborne alkyd resin and a preparation method thereof, the epoxy ester modified waterborne alkyd resin is prepared by grafting an epoxy ester prepolymer onto an alkyd resin, introducing a hydrophilic monomer, and then neutralizing and dispersing, wherein the raw materials for preparing the epoxy ester modified waterborne alkyd resin comprise the following components in parts by weight: epoxy ester prepolymer: 15-39 parts of organic monobasic fatty acid: 90-110 parts of organic dibasic acid: 28-37 parts of organic polyol: 18-30 parts of xylene: 15-21 parts of trimellitic anhydride: 10-20 parts of a cosolvent: 30-60 parts of a neutralizer: 15-26.5 parts. The epoxy ester modified waterborne alkyd resin disclosed by the invention has excellent properties such as dryness, hardness, adhesive force and water resistance, when the epoxy ester modified waterborne alkyd resin is used for waterborne coatings, the obtained waterborne coatings have the characteristics of strong adhesive force, high hardness, excellent impact resistance and the like, the VOC emission in the waterborne coatings is extremely low, the performance can reach or exceed the performance index of similar solvent-based coatings, and the waterborne alkyd resin is energy-saving, environment-friendly and suitable for large-scale popularization and application.
Description
Technical Field
The invention relates to the technical field of chemical industry, and particularly relates to epoxy ester modified waterborne alkyd resin and a preparation method thereof.
Background
The alkyd resin belongs to the synthetic resin with the earliest development and the largest total yield in China, has good comprehensive performance, has rich raw material sources, does not completely depend on petrochemical products, and has relatively little influence on the production cost by the price of petroleum. Meanwhile, the resin has a low acid value, can be dissolved in various organic solvents, is suitable for surface coating of wood, plastics and metal, and has good wetting and dispersing properties for pigments, fillers and the like.
The water-based resins commonly used for water-based coatings are: waterborne epoxy resin, waterborne polyurethane, waterborne acrylic resin, waterborne alkyd resin and the like. The alkyd resin is the synthetic resin which is the earliest developed in China and has the largest yield, is low in price, simple in construction, rich in raw material source, low in acid value, capable of being dissolved in various organic solvents, suitable for surface coating of all wood, plastics and metal, and good in wetting and dispersing performance on pigments, fillers and the like, and the paint prepared from the alkyd resin is bright in paint film, strong in adhesive force, good in durability, excellent in flexibility, gloss and fullness, and can be mixed with various synthetic resins for use. Of course, alkyd resins also have the disadvantages of slow drying of the coating film, low hardness, poor water resistance and corrosion resistance, poor outdoor weather resistance, and the like, and the properties of the alkyd resins need to be improved by modification. In order to meet the requirements of environmental protection regulations and the needs of the market, the development of alkyd resins will be changed with the broadening and deepening of water-based and modification researches.
The alkyd resin molecule has a polar main chain and a non-polar side chain, so that the alkyd resin can be well mixed with a plurality of resins and compounds, and a premise is provided for carrying out various physical modifications; in addition, the molecule of the alkyd resin has reactive groups such as hydroxyl, carboxyl, double bonds and the like, and other molecules can be introduced through a chemical synthesis way, which is the basis for chemically modifying the alkyd resin. The modification research of the waterborne alkyd resin mainly focuses on the following aspects:
1. styrene-modified waterborne alkyd resin: the styrene modified alkyd resin coating has three characteristics: strong bonding force, high drying speed and good water resistance. Firstly, raw materials of the styrene modified synthetic alkyd resin, namely modified fatty acid or alcoholysis oil, are modified by styrene and then the water-soluble alkyd resin is synthesized, so that the styrene modified water-based alkyd resin is obtained; another method is to prepare water-soluble alkyd resin and then modify the alkyd resin with styrene. Generally, the product of the latter has better comprehensive performance, and the production process is easy to control. The styrene modified water-soluble alkyd resin can improve the water resistance, alkali resistance, hardness and drying rate of the alkyd resin, and can be used for preparing quick-drying, moisture-resistant, bright and beautiful indoor protective and decorative enamel paint and agricultural paint, but the styrene modified water-soluble alkyd resin reduces the flexibility, weather resistance and hydrocarbon solvent resistance of the resin, and cannot be mixed with unmodified alkyd resin, so that the styrene modified water-soluble alkyd resin and the unmodified alkyd resin cannot be mixed for use;
2. acrylic modified waterborne alkyd resin: there are generally two methods for acrylic-modifying water-soluble alkyd resins: one is a double-bond copolymerization method, namely, the Diels-Alder reaction is carried out on an acrylic monomer and a conjugated double bond on a fatty chain in alkyd resin; another modification is to copolymerize the monomer with an unsaturated dibasic acid such as maleic anhydride in the prepolymer to acrylate the conjugated double bond. Binary cyclic carboxylic acid is introduced into the alkyd resin, and acrylate monomers are grafted to the alkyd resin molecules through radical polymerization to synthesize the acrylic acid modified water-soluble alkyd resin. In general, acrylic modified alkyd resins have better weatherability, optical retention and scratch resistance than styrene modified alkyd resins. Thus, the acrylic modification of alkyd resins is a promising area of research. However, the method also has the disadvantages of long process route and high cost, and the technical application is influenced.
The epoxy resin is a macromolecule containing epoxy groups, reacts with a curing agent or fatty acid, and is crosslinked into a macromolecule with a network structure, so that the coating resin with excellent performance can be prepared. The epoxy resin paint film has excellent chemical resistance and alkali resistance, and has excellent adhesion to polar substrates such as metal, ceramic, concrete, plastic, wood and the like. The epoxy resin can be used as a crosslinking agent of alkyd resin in a film forming process, and can also be introduced in an alkyd resin synthesis process to be used for modifying the alkyd resin. However, the existing method for modifying the waterborne alkyd resin by adopting the epoxy resin has less research and is not obvious in effect. Therefore, if the epoxy ester modified waterborne alkyd resin with excellent performance can be developed, the epoxy ester modified waterborne alkyd resin has great social and environmental benefits.
Disclosure of Invention
In view of the above, the invention aims to provide an epoxy ester modified waterborne alkyd resin to solve the problem that when the existing chemically modified waterborne alkyd resin is used for preparing a waterborne coating, the flexibility, the weather resistance and other properties of the existing chemically modified waterborne alkyd resin are low.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an epoxy ester modified waterborne alkyd resin is prepared by grafting an epoxy ester prepolymer onto an alkyd resin, introducing a hydrophilic monomer, and neutralizing and dispersing, wherein the epoxy ester modified waterborne alkyd resin is prepared from the following raw materials in parts by weight: epoxy ester prepolymer: 15-39 parts of organic monobasic fatty acid: 90-110 parts of organic dibasic acid: 28-37 parts of organic polyol: 18-30 parts of xylene: 15-21 parts of trimellitic anhydride: 10-20 parts of a cosolvent: 30-60 parts of a neutralizer: 15-26.5 parts.
Optionally, the epoxy ester prepolymer is prepared by performing a prepolymerization reaction on the following components in parts by weight: epoxy resin: 35-55 parts of organic monobasic fatty acid: 55-70 parts of organic catalyst: 0.5 to 1.0 portion.
Optionally, the organic catalyst is tetrabutylammonium bromide.
Optionally, the organic monobasic fatty acid is one or more of linolenic acid, linoleic acid, n-pelargonic acid, eleostearic acid and glycleic acid.
Optionally, the organic diacid is one or more of phthalic anhydride, isophthalic acid, tetrahydrophthalic anhydride, azelaic acid, adipic acid, and succinic acid.
Optionally, the organic polyol is one or more of trimethylolpropane, pentaerythritol, glycerol, trimethylolethane.
Optionally, the co-solvent is one or more of ethylene glycol monobutyl ether, ethylene glycol monopropyl ether, propylene glycol monobutyl ether, propylene glycol methyl ether, diethylene glycol butyl ether, dipropylene glycol butyl ether, isopropanol, and n-butanol.
Optionally, the neutralizing agent is one or more of triethylamine, ammonia water and dimethylethanolamine.
The second purpose of the invention is to provide a method for preparing the epoxy ester modified waterborne alkyd resin, which comprises the following steps:
1) synthesis of epoxy ester modified alkyd resin: mixing the epoxy ester prepolymer, the organic monobasic fatty acid, the organic dibasic acid, the organic polyol and the xylene, heating to 220 ℃, and carrying out esterification until the acid value is 5-10 mgKOH/g to obtain epoxy ester modified alkyd resin;
2) aquosity of epoxy ester modified alkyd resin: adding trimellitic anhydride into the epoxy ester modified alkyd resin at 170-180 ℃, carrying out esterification until the acid value is 40-50 mgKOH/g, then, removing xylene under reduced pressure at 170-180 ℃, then, adding the cosolvent at 100-120 ℃, uniformly stirring, then, cooling to 60 ℃, adding the neutralizer, and adjusting the pH value to 8.5-9 to obtain the epoxy ester modified waterborne alkyd resin.
Optionally, the epoxy ester prepolymer in the step 1) is prepared by the following method: mixing 55-70 parts of organic monobasic fatty acid, 35-55 parts of epoxy resin and 0.5-1.0 part of organic catalyst, heating to 120-130 ℃ under stirring, and carrying out prepolymerization reaction until the acid value is less than 5mgKOH/g to obtain the epoxy ester prepolymer.
Compared with the prior art, the epoxy ester modified waterborne alkyd resin has the following advantages:
1. the epoxy ester modified waterborne alkyd resin not only maintains excellent performances of paint dryness, glossiness, durability, flexibility, better solubility and the like of alkyd resin, but also has excellent cohesiveness and good self-drying property of epoxy resin, and has good water resistance, solvent resistance and physical and mechanical properties.
2. The epoxy ester modified waterborne alkyd resin disclosed by the invention is applied to a waterborne coating, the prepared waterborne coating has the advantages of strong adhesive force, high hardness, excellent water resistance and the like, the VOC emission in a waterborne coating system is extremely low, the performance can reach or exceed the performance index of similar solvent-based coatings, and the waterborne coating is energy-saving, environment-friendly, capable of improving the safety of transportation and construction and suitable for large-scale popularization and application.
3. The epoxy ester modified waterborne alkyd resin is prepared by using epoxy ester as a modified material, synthesizing the epoxy ester through the reaction of epoxy resin and fatty acid, and carrying out water-based treatment after the epoxy ester is grafted to alkyd resin.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a FTIR spectrum of an epoxy ester modified waterborne alkyd resin of example 1 of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the drawings and examples.
Example 1
An epoxy ester modified waterborne alkyd resin is prepared by grafting an epoxy ester prepolymer onto an alkyd resin, introducing a hydrophilic monomer, and then neutralizing and dispersing, wherein the raw materials for preparing the epoxy ester modified waterborne alkyd resin comprise: epoxy ester prepolymer: 35g, soya oil acid: 100g, phthalic anhydride: 18g, tetrahydrophthalic anhydride: 10g, pentaerythritol: 30g, xylene: 15g, trimellitic anhydride: 10g, ethylene glycol monobutyl ether: 60g, dimethylethanolamine: 15g, wherein the epoxy ester prepolymer is prepared by the prepolymerization reaction of the following components: soya oil acid: 55g, E51 epoxy resin: 35g, tetrabutylammonium bromide: 0.8 g.
The epoxy ester modified waterborne alkyd resin is prepared by the following method:
1) preparation of epoxy ester prepolymer: according to the formula of the raw materials, after the soya-bean oil acid, the E51 epoxy resin and the tetrabutyl ammonium bromide are mixed, the temperature is raised to 125 ℃ under stirring, the temperature is kept, the prepolymerization reaction is carried out for 2.5 hours, and the acid value is 1.5mgKOH/g, so as to obtain an epoxy ester prepolymer;
2) synthesis of epoxy ester modified alkyd resin: according to the formula of the raw materials, mixing epoxy ester prepolymer, soya-bean oleic acid, phthalic anhydride, tetrahydrophthalic anhydride, pentaerythritol and xylene, slowly raising the temperature, keeping the temperature rising to 10 ℃ per hour, keeping the temperature rising to 220 ℃, starting sampling to measure the acid value after keeping the esterification reaction for 1.0h, then sampling once every 0.5h to measure the acid value, keeping the esterification reaction for 3h, and obtaining the epoxy ester modified alkyd resin with the acid value of 5 mgKOH/g;
3) aquosity of epoxy ester modified alkyd resin: after the reaction in the step 2) is finished, cooling to 175 ℃, adding trimellitic anhydride into the epoxy ester modified alkyd resin according to the formula of the raw materials, keeping the esterification reaction for 20min, starting sampling to measure the acid value, then sampling once every 10min to measure the acid value, keeping the esterification reaction for 1h, keeping the acid value to be 47mgKOH/g, then decompressing at 170 ℃ to remove xylene, cooling to 120 ℃, adding ethylene glycol monobutyl ether, stirring uniformly, cooling to 60 ℃, adding dimethylethanolamine, and neutralizing and dispersing to obtain the epoxy ester modified waterborne alkyd resin.
The epoxy ester modified waterborne alkyd resin of the embodiment is used for preparing a waterborne coating, and specifically comprises the following steps: water, a proper amount of pigment, filler and auxiliary agent are added into the epoxy ester modified waterborne alkyd resin of the embodiment, and the waterborne industrial anticorrosive paint is obtained after dispersion and grinding.
After 5% of aqueous drier (HLD061) is added into the aqueous industrial anticorrosive paint, the paint is uniformly coated on the surface of a polished tin plate, a paint film is naturally cured for 7 days, the thickness of the dry film is 35 microns, the hardness is 0.35, the adhesive force is 1 grade, the flexibility is 1mm, and the water resistance is 3 d.
Example 2
An epoxy ester modified waterborne alkyd resin is prepared by grafting an epoxy ester prepolymer onto an alkyd resin, introducing a hydrophilic monomer, and then neutralizing and dispersing, wherein the raw materials for preparing the epoxy ester modified waterborne alkyd resin comprise: epoxy ester prepolymer: 39g, linolenic acid: 110g, phthalic anhydride: 27g, isophthalic acid: 10g, pentaerythritol: 21g, xylene: 21g, trimellitic anhydride: 14.5g, ethylene glycol monopropyl ether: 95g, dimethylethanolamine: 17.5g, wherein the epoxy ester prepolymer was prepared by a prepolymerization reaction of the following components: linolenic acid: 70g, E20 epoxy resin: 55g, tetrabutylammonium bromide: 1g of the total weight of the composition.
The epoxy ester modified waterborne alkyd resin is prepared by the following method:
1) preparation of epoxy ester prepolymer: according to the formula of the raw materials, mixing linolenic acid, E20 epoxy resin and tetrabutylammonium bromide, heating to 120 ℃ under stirring, carrying out heat preservation and prepolymerization reaction for 3 hours, wherein the acid value is 2mgKOH/g, and obtaining an epoxy ester prepolymer;
2) synthesis of epoxy ester modified alkyd resin: according to the formula of the raw materials, mixing epoxy ester prepolymer, linolenic acid, phthalic anhydride, isophthalic acid, pentaerythritol and xylene, slowly raising the temperature, keeping the temperature rising to 10 ℃ per hour, keeping the temperature rising to 220 ℃, starting sampling to measure the acid value after keeping esterification reaction for 1.0h, then sampling once every 0.5h to measure the acid value, keeping the esterification reaction for 3.5h, and obtaining the epoxy ester modified alkyd resin with the acid value of 10 mgKOH/g;
3) aquosity of epoxy ester modified alkyd resin: after the reaction in the step 2) is finished, cooling to 180 ℃, adding trimellitic anhydride into the epoxy ester modified alkyd resin according to the formula of the raw materials, keeping the esterification reaction for 20min, starting sampling to measure the acid value, then sampling once every 10min to measure the acid value, keeping the esterification reaction for 1.2h, then keeping the acid value to be 50mgKOH/g, then decompressing at 170 ℃ to remove xylene, cooling to 120 ℃, adding ethylene glycol monopropyl ether, stirring uniformly, cooling to 60 ℃, adding dimethylethanolamine, and neutralizing and dispersing to obtain the epoxy ester modified waterborne alkyd resin.
The epoxy ester modified waterborne alkyd resin of the embodiment is used for preparing a waterborne coating, and specifically comprises the following steps: water, a proper amount of pigment, filler and auxiliary agent are added into the epoxy ester modified waterborne alkyd resin of the embodiment, and the waterborne industrial anticorrosive paint is obtained after dispersion and grinding.
After 5% of aqueous drier (HLD061) is added into the aqueous industrial anticorrosive paint, the paint is uniformly coated on the surface of a polished tin plate, a paint film is naturally maintained for 7 days, the thickness of the dry film is 40 microns, the hardness is 0.32, the adhesive force is 1 grade, the flexibility is 1mm, and the water resistance is 3 d.
Example 3
An epoxy ester modified waterborne alkyd resin is prepared by grafting an epoxy ester prepolymer onto an alkyd resin, introducing a hydrophilic monomer, and then neutralizing and dispersing, wherein the raw materials for preparing the epoxy ester modified waterborne alkyd resin comprise: epoxy ester prepolymer: 28g, soya oil acid: 105g, phthalic anhydride: 17g, isophthalic acid: 8g, tetrahydrophthalic anhydride: 8g, pentaerythritol: 27g, xylene: 30g, trimellitic anhydride: 10g, propylene glycol butyl ether: 100g, dimethylethanolamine: 20g, wherein the epoxy ester prepolymer is prepared by the prepolymerization reaction of the following components: soya oil acid: 50g, E44 epoxy resin: 50g, tetrabutylammonium bromide: 0.5 g.
The epoxy ester modified waterborne alkyd resin is prepared by the following method:
1) preparation of epoxy ester prepolymer: according to the formula of the raw materials, after the soya-bean oil acid, the E44 epoxy resin and the tetrabutyl ammonium bromide are mixed, the temperature is raised to 130 ℃ under stirring, the temperature is kept, the prepolymerization reaction is carried out for 1.5h, and the acid value is 3.5mgKOH/g, so as to obtain an epoxy ester prepolymer;
2) synthesis of epoxy ester modified alkyd resin: according to the formula of the raw materials, mixing epoxy ester prepolymer, soya-bean oleic acid, phthalic anhydride, isophthalic acid, tetrahydrophthalic anhydride, pentaerythritol and xylene, slowly raising the temperature, keeping the temperature at 10 ℃ per hour, keeping the temperature at 220 ℃, starting sampling and measuring the acid value after keeping the esterification reaction for 1.0h, then sampling once every 0.5h for measuring the acid value, keeping the acid value at 5mgKOH/g after keeping the esterification reaction for 2.5h, and obtaining epoxy ester modified alkyd resin;
3) aquosity of epoxy ester modified alkyd resin: after the reaction in the step 2) is finished, cooling to 170 ℃, adding trimellitic anhydride into the epoxy ester modified alkyd resin according to the formula of the raw materials, raising the temperature to 180 ℃ every 15min, keeping the esterification reaction for 15min, starting sampling to measure the acid value, then sampling once every 10min, keeping the esterification reaction for 40min, keeping the acid value to be 49.5mgKOH/g, then removing dimethylbenzene under the reduced pressure of 170 ℃, cooling to 120 ℃, adding propylene glycol butyl ether, stirring uniformly, cooling to 60 ℃, adding dimethylethanolamine, and neutralizing and dispersing to obtain the epoxy ester modified waterborne alkyd resin.
The epoxy ester modified waterborne alkyd resin of the embodiment is used for preparing a waterborne coating, and specifically comprises the following steps: water, a proper amount of pigment, filler and auxiliary agent are added into the epoxy ester modified waterborne alkyd resin of the embodiment, and the waterborne industrial anticorrosive paint is obtained after dispersion and grinding.
After 5% of aqueous drier (HLD061) is added into the aqueous industrial anticorrosive paint, the paint is uniformly coated on the surface of a polished tin plate, a paint film is naturally maintained for 7 days, the thickness of the dry film is 32 microns, the hardness is 0.30, the adhesive force is 1 grade, the flexibility is 1mm, and the water resistance is 5 days.
FTIR infrared testing was performed on the epoxy ester modified waterborne alkyd of example 1 of the present invention, and the results are shown in FIG. 1.
As can be seen from FIG. 1, the length of the groove is 3402cm-1A blunted spectral band appears, which is a stretching vibration absorption peak of hydroxyl (-OH), and indicates that the prepared alkyd resin has hydroxyl (-OH) on the molecule; 3008cm-1Is the absorption peak of the unsaturated double bond in the fatty acid; 2927cm-1And 2855cm-1Is the C-H stretching vibration absorption peak; 1738cm-1A strong C ═ O absorption peak indicates that esterification reaction is carried out, and ester bonds exist in the system; 1585cm-1Is the absorption peak of carboxyl (-COOH), which indicates that partial carboxyl is reserved on the molecule of the synthesized waterborne alkyd resin; 1258cm-1Is C-O-C asymmetric expansion common band, 1073cm-1Is a C-O-C symmetrical telescopic common band, and shows that epoxy ester participates in the reaction and ether bonds exist in the system.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The epoxy ester modified waterborne alkyd resin is characterized in that after an epoxy ester prepolymer is grafted to alkyd resin, hydrophilic monomers are introduced, and the alkyd resin is prepared by neutralization and dispersion, wherein the epoxy ester modified waterborne alkyd resin is prepared from the following raw materials in parts by weight: epoxy ester prepolymer: 15-39 parts of organic monobasic fatty acid: 90-110 parts of organic dibasic acid: 28-37 parts of organic polyol: 18-30 parts of xylene: 15-21 parts of trimellitic anhydride: 10-20 parts of a cosolvent: 30-60 parts of a neutralizer: 15-26.5 parts.
2. The epoxy ester modified waterborne alkyd resin of claim 1, wherein the epoxy ester prepolymer is prepared by a prepolymerization reaction of the following components in parts by weight: epoxy resin: 35-55 parts of organic monobasic fatty acid: 55-70 parts of organic catalyst: 0.5 to 1.0 portion.
3. The epoxy ester-modified waterborne alkyd resin of claim 2, wherein the organic catalyst is tetrabutylammonium bromide.
4. The epoxy ester modified waterborne alkyd resin of claim 1 or 2, wherein the organic monobasic fatty acid is one or more of linolenic acid, linoleic acid, n-nonanoic acid, eleostearic acid, and soyaoleic acid.
5. The epoxy ester modified waterborne alkyd resin of claim 1, wherein the organic diacid is one or more of phthalic anhydride, isophthalic acid, tetrahydrophthalic anhydride, azelaic acid, adipic acid, and succinic acid.
6. The epoxy ester modified waterborne alkyd resin of claim 1, wherein the organic polyol is one or more of trimethylolpropane, pentaerythritol, glycerol, trimethylolethane.
7. The epoxy ester modified waterborne alkyd resin of claim 1, wherein the co-solvent is one or more of ethylene glycol monobutyl ether, ethylene glycol monopropyl ether, propylene glycol monobutyl ether, propylene glycol methyl ether, diethylene glycol butyl ether, dipropylene glycol butyl ether, isopropanol, and n-butanol.
8. The epoxy ester modified waterborne alkyd resin of claim 1, wherein the neutralizing agent is one or more of triethylamine, ammonia, dimethylethanolamine.
9. A process for preparing an epoxy ester-modified waterborne alkyd according to any of claims 1 to 8, comprising the steps of:
1) synthesis of epoxy ester modified alkyd resin: mixing the epoxy ester prepolymer, the organic monobasic fatty acid, the organic dibasic acid, the organic polyol and the xylene, heating to 220 ℃, and carrying out esterification until the acid value is 5-10 mgKOH/g to obtain epoxy ester modified alkyd resin;
2) aquosity of epoxy ester modified alkyd resin: adding trimellitic anhydride into the epoxy ester modified alkyd resin at 170-180 ℃, carrying out esterification until the acid value is 40-50 mgKOH/g, then, removing xylene under reduced pressure at 170-180 ℃, then, adding the cosolvent at 100-120 ℃, uniformly stirring, then, cooling to 60 ℃, adding the neutralizer, and adjusting the pH value to 8.5-9 to obtain the epoxy ester modified waterborne alkyd resin.
10. The method for preparing the epoxy ester modified waterborne alkyd resin of claim 9, wherein the epoxy ester prepolymer in the step 1) is prepared by the following steps: mixing 55-70 parts of organic monobasic fatty acid, 35-55 parts of epoxy resin and 0.5-1.0 part of organic catalyst, heating to 120-130 ℃ under stirring, and carrying out prepolymerization reaction until the acid value is less than 5mgKOH/g to obtain the epoxy ester prepolymer.
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| CN111763307A (en) * | 2020-07-06 | 2020-10-13 | 华伦纳路新材料有限公司 | Fatty acid modified waterborne alkyd resin and preparation method thereof |
| CN112625227A (en) * | 2020-12-08 | 2021-04-09 | 绵阳麦思威尔科技有限公司 | Curing agent modified waterborne alkyd resin and modified intermediate |
| CN113831519A (en) * | 2021-09-27 | 2021-12-24 | 北京化工大学 | Epoxy resin prepolymer modified waterborne alkyd resin and preparation method thereof |
| CN113980256A (en) * | 2021-11-30 | 2022-01-28 | 珠海展辰新材料股份有限公司 | Water-based alkyd resin and preparation method thereof |
| CN114133546A (en) * | 2021-08-17 | 2022-03-04 | 南京杰腾新材料科技有限公司 | High-performance water-based resin and preparation method thereof |
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| CN111763307A (en) * | 2020-07-06 | 2020-10-13 | 华伦纳路新材料有限公司 | Fatty acid modified waterborne alkyd resin and preparation method thereof |
| CN112625227A (en) * | 2020-12-08 | 2021-04-09 | 绵阳麦思威尔科技有限公司 | Curing agent modified waterborne alkyd resin and modified intermediate |
| CN112625227B (en) * | 2020-12-08 | 2023-06-13 | 绵阳麦思威尔科技有限公司 | Curing agent modified waterborne alkyd resin and modified intermediate |
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| CN113831519A (en) * | 2021-09-27 | 2021-12-24 | 北京化工大学 | Epoxy resin prepolymer modified waterborne alkyd resin and preparation method thereof |
| CN113831519B (en) * | 2021-09-27 | 2022-11-25 | 北京化工大学 | Epoxy resin prepolymer modified waterborne alkyd resin and preparation method thereof |
| CN113980256A (en) * | 2021-11-30 | 2022-01-28 | 珠海展辰新材料股份有限公司 | Water-based alkyd resin and preparation method thereof |
| CN114702885A (en) * | 2022-03-01 | 2022-07-05 | 江苏凯乐迪新材料科技有限公司 | Quick-drying water-based paint |
| CN114702885B (en) * | 2022-03-01 | 2023-02-28 | 江苏凯乐迪新材料科技有限公司 | Quick-drying water-based paint |
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