阅读说明：本技术 一种环保型聚芳醚砜高性能防腐蚀涂料及其制备方法 (Environment-friendly polyarylethersulfone high-performance anticorrosive paint and preparation method thereof ) 是由 关绍巍 舒萌 王洪悦 祝世洋 姚洪岩 于 2021-08-31 设计创作，主要内容包括：一种环保型聚芳醚砜高性能防腐蚀涂料及其制备方法,属于涂料技术领域。由42％～47％的双酚S型环氧树脂、21～23％的含醚砜键芳香胺类固化剂、5％～13％的含氨基聚醚砜树脂、1～8％的颜填料、1～8％的助剂和余量的稀释剂组成。其是在搅拌下将含氨基聚醚砜树脂溶于部分稀释剂中,加入双酚S型环氧树脂、颜填料、助剂于砂磨机中研磨3～6h；再加入含醚砜键芳香胺固化剂和剩余的稀释剂,搅拌0.3～0.5h进行熟化后得到该涂料组合物。本发明所使用的含醚砜键的芳香胺类固化剂、双酚S型环氧树脂及聚醚砜树脂由于具有相似的芳醚砜类结构,有效提高了复合涂料的稳定性、耐热性、柔韧性、耐溶剂性及长期防腐蚀能力。(An environment-friendly polyarylethersulfone high-performance anticorrosive coating and a preparation method thereof, belonging to the technical field of coatings. The epoxy resin coating is composed of 42% -47% of bisphenol S type epoxy resin, 21% -23% of aromatic amine curing agent containing ether sulfone bond, 5% -13% of amino-containing polyether sulfone resin, 1% -8% of pigment and filler, 1% -8% of auxiliary agent and the balance of diluent. Dissolving amino-containing polyether sulfone resin into a part of diluent under stirring, adding bisphenol S type epoxy resin, pigment filler and auxiliary agent, and grinding for 3-6 hours in a sand mill; and adding the ether sulfone bond-containing aromatic amine curing agent and the rest of the diluent, stirring for 0.3-0.5 h, and curing to obtain the coating composition. The aromatic amine curing agent containing the ether sulfone bond, the bisphenol S type epoxy resin and the polyether sulfone resin used in the invention have similar aromatic ether sulfone structures, so that the stability, heat resistance, flexibility, solvent resistance and long-term corrosion resistance of the composite coating are effectively improved.)

1. An environment-friendly polyarylethersulfone high-performance anticorrosive coating is characterized in that: the adhesive comprises 42-47 wt% of bisphenol S type epoxy resin, 21-23 wt% of aromatic amine curing agent containing ether sulfone bond, 5-13 wt% of amino-containing polyether sulfone resin, 1-8 wt% of pigment and filler, 1-8 wt% of auxiliary agent and the balance of diluent, wherein the mass percentage of the components is calculated according to 100%;

wherein, the bisphenol S type epoxy resin is one or two of the compounds shown in structural formulas (1), (2) and (3), and when the two resins are mixed, the mass ratio is 1: 1;

the ether sulfone bond-containing aromatic amine curing agent is a compound shown as a structural formula (4), and the name of the compound is 4, 4' -bis (4-aminophenoxy) diphenyl sulfone;

the amino-containing polyether sulfone resin is one or more of polyether sulfone resin with amino side group shown in structural formula (5) or amino-terminated polyether sulfone resin shown in structural formula (6); when the two resins are mixed, the mass ratio of the two resins is 0.5-5: 1;

wherein n is an integer of 20-100, x is an integer of 5-20, and n is not equal to x;

wherein n is an integer of 20 to 100.

2. The environment-friendly polyarylethersulfone high-performance anticorrosive coating as claimed in claim 1, wherein: the diluent consists of 30-60% of N, N' -dimethylacetamide, 30-40% of toluene and the balance of N-butanol, wherein the mass percentage of each component is calculated based on 100%.

3. The environment-friendly polyarylethersulfone high-performance anticorrosive coating as claimed in claim 1, is characterized in that: the pigment and filler is one or more of carbon black, titanium dioxide and lamellar pearl powder; the auxiliary agent is one or two of organic bentonite and fumed silica.

4. The preparation method of the environment-friendly polyarylethersulfone high-performance anticorrosive coating as claimed in any one of claims 1 to 3, characterized in that: dissolving the amino-containing polyether sulfone resin into a part of diluent at a stirring speed of 3500-4000 r/min, adding bisphenol S type epoxy resin, pigment filler and auxiliary agent, and grinding for 3-6 h in a sand mill; and adding the ether sulfone bond-containing aromatic amine curing agent and the rest of the diluent, stirring for 0.3-0.5 h, and curing to obtain the environment-friendly polyarylether sulfone high-performance anticorrosive coating.

5. The preparation method of the environment-friendly polyarylethersulfone high-performance anticorrosive coating as claimed in claim 4, characterized in that the preparation steps of the aromatic amine curing agent containing ethersulfone bond are as follows:

(1) under the protection of nitrogen, mixing the components in a molar ratio of 1: (2-2.8): (2-2.8) adding the dihydroxydiphenyl sulfone, the p-chloronitrobenzene and the potassium carbonate into N, N-dimethylformamide, and carrying out condensation reflux reaction for 8-10 hours at the temperature of 120-150 ℃; after the reaction is finished, cooling the reaction system to room temperature, and discharging the material in a volume ratio of 1:1, precipitating a yellow solid product in the mixed solution of water and absolute ethyl alcohol, filtering the product, repeatedly washing the product with water to remove impurities, and further treating the product with a volume ratio of 1:1, recrystallizing with ethanol and water to obtain a light yellow product, namely 4, 4' -bis (4-nitrophenoxy) diphenyl sulfone, and drying in vacuum;

(2) under the protection of nitrogen, 100 g: (0.8-1.0) g: (650-850) mL of the product obtained in the step (1), palladium carbon and an ethanol solvent are heated and refluxed, and then the volume ratio of the product to the ethanol is 1: (9-11) and slowly dripping 80 wt% of hydrazine hydrate aqueous solution into the mixture, heating and refluxing for 3-5 hours, then carrying out hot filtration on the product, naturally precipitating a product 4, 4' -bis (4-aminophenoxy) diphenyl sulfone after cooling the solution, and drying in vacuum.

Technical Field

The invention belongs to the technical field of coatings, and particularly relates to an environment-friendly polyarylethersulfone high-performance anticorrosive coating and a preparation method thereof.

Background

Epoxy system anticorrosion coatings are one of the most common methods of protecting metal substrates in corrosive environments. The epoxy resin as thermosetting resin has chemical stability, excellent physical performance and excellent thermal performance based on the chemical structure and curing condition of the curing agent. The epoxy resin and the curing agent thereof are various, so that the selection of a proper epoxy resin system for the high-performance long-acting anticorrosive coating is particularly important. The bisphenol S type epoxy resin is a liquid crystal epoxy resin, has liquid crystal order, has the advantages of a cross-linked network structure, has excellent mechanical, heat-resistant and dielectric properties, and is greatly improved in heat resistance, impact resistance, dimensional stability and the like compared with the traditional epoxy resin. Due to the introduction of extremely strong rigid sulfuryl polar groups, the heat resistance and the thermal stability of the bisphenol S type epoxy resin and the strength and the toughness of a condensate thereof are obviously superior to those of the bisphenol A type epoxy resin. And due to the higher heat resistance, the bisphenol S type epoxy resin can be suitable for the curing temperature of the polyether sulfone resin.

The rigid group and the flexible group in the molecular structure of the polyether sulfone enable the polyether sulfone to have excellent flexibility, impact resistance, heat resistance and hardness. In addition, the polyether sulfone has excellent metal adhesion, and is expected to be applied to epoxy resin as a filler to jointly prepare a composite coating so as to improve the long-term corrosion resistance of the epoxy resin. In recent years, polyethersulfone coatings have been extensively studied and used.

The invention discloses a preparation method of a marine anticorrosive composite coating, and application publication No. CN 110041807A, wherein the marine anticorrosive composite coating is prepared by adding mixed slurry of organic silicon modified bisphenol A novolac epoxy resin and polyether sulfone into modified nano zinc oxide slurry.

The Chinese invention patent, a high heat resistance epoxy resin and a preparation method thereof, application publication No. CN 110330763A, is obtained by mixing epoxy end capping modified oligomeric polyether sulfone with bisphenol A epoxy resin, and the temperature of 5 percent thermal weight loss is 251-263 ℃.

The invention relates to a special anticorrosive and drag-reducing coating for solvent-free oil pipelines and a preparation method thereof, and application publication No. CN 111205746A, wherein a composite coating system of liquid epoxy resin and glass fiber powder with the solid content of 98 percent is prepared by introducing polyether sulfone modified epoxy resin and long-carbon-chain aromatic hydrocarbon resin.

Therefore, the epoxy resin system is widely applied to the field of anticorrosive coatings, but the epoxy resin and the curing agent are various, and the long-term corrosion resistance of metal is not good, and the long-term protection capability of the coating on the metal is improved by adding the special engineering plastic polyether sulfone with excellent comprehensive performance into the epoxy resin curing agent system. The aromatic amine curing agent containing the ether sulfone bond is applied to a bisphenol S type epoxy resin system, in order to further improve the long-term anti-corrosion capability of the coating, the polyether sulfone resin with excellent comprehensive performance is added into the coating composition, the compatibility of the polyether sulfone in the epoxy resin coating is improved due to the similar structure of the ether sulfone, and the environment-friendly polyether sulfone high-performance anti-corrosion coating is prepared.

Disclosure of Invention

The invention aims to provide an environment-friendly polyarylethersulfone high-performance anticorrosive coating and a preparation method thereof.

The environment-friendly polyarylethersulfone high-performance anticorrosive coating is a composition, and comprises, by mass, 42-47% of bisphenol S type epoxy resin, 21-23% of ether sulfone bond-containing aromatic amine curing agent, 5-13% of amino-containing polyethersulfone resin, 1-8% of pigment and filler, 1-8% of auxiliary agent and the balance of diluent, wherein the mass percentages of the components are calculated according to 100%.

Wherein, the structural formula of the bisphenol S type epoxy resin is one or two of (1), (2) and (3), and when the two resins are mixed, the mass ratio is 1: 1.

common aromatic amine curing agent 4, 4' -diaminodiphenyl sulfone can improve the heat resistance grade and the thermal stability of the coating, but due to the short chain structure, the curing agent and the epoxy resin have stronger rigidity. Therefore, the invention introduces the aromatic amine curing agent containing ether bond into the curing system to reduce the rigidity of the coating and further improve the heat-resistant grade of the coating, thereby enhancing the functionality of the coating. The structural formula of the ether sulfone bond-containing aromatic amine curing agent is (4), and the name of the ether sulfone bond-containing aromatic amine curing agent is 4, 4' -bis (4-aminophenoxy) diphenyl sulfone (DOS):

the preparation method comprises the following steps:

(1) under the protection of nitrogen, mixing the components in a molar ratio of 1: (2-2.8): (2-2.8) adding the dihydroxydiphenyl sulfone, the p-chloronitrobenzene and the potassium carbonate into N, N-dimethylformamide, and carrying out condensation reflux reaction for 8-10 hours at the temperature of 120-150 ℃; after the reaction is finished, cooling the reaction system to room temperature, and discharging the material in a volume ratio of 1:1, precipitating a yellow solid product in a mixed solution of water and absolute ethyl alcohol, filtering the product, repeatedly washing the product with water to remove impurities, further recrystallizing the product with ethanol and water (the volume ratio of the ethanol to the water is 1: 1) to obtain a light yellow product, namely 4, 4' -bis (4-nitrophenoxy) diphenyl sulfone, and drying the product in vacuum;

(2) under the protection of nitrogen, 100 g: (0.8-1.0) g: (650-850) mL of the product obtained in the step (1), palladium carbon and an ethanol solvent are heated and refluxed, and then the volume ratio of the product to the ethanol is 1: and (9) slowly dripping 80 wt% of hydrazine hydrate aqueous solution into the solution, heating and refluxing for 3-5 hours, then carrying out hot filtration on the product, naturally precipitating the product 4, 4' -bis (4-aminophenoxy) diphenyl sulfone after cooling the solution, and drying in vacuum.

The amino-containing polyether sulfone resin is one or more of polyether sulfone resin with amino side groups and polyether sulfone resin with amino end capping, and the structural formulas of the amino-containing polyether sulfone resin and the amino end capping polyether sulfone resin are (5) and (6); when the two resins are mixed, the mass ratio of the two resins is 0.5-5: 1.

wherein n is an integer of 20-100, x is an integer of 5-20, and n is not equal to x;

wherein n is an integer of 20 to 100.

The polyether sulfone resin with the amino side group and the polyether sulfone resin with the amino end capping can react with bisphenol S epoxy resin, so that the compatibility of the polyether sulfone resin in an epoxy resin system is improved, a uniform and compact cross-linking network is formed, the gaps of a coating are reduced, a corrosive medium is effectively prevented from contacting a substrate, and the long-term corrosion resistance of the coating is improved.

The diluent consists of 30-60% of N, N' -dimethylacetamide, 30-40% of toluene and the balance of N-butyl alcohol by mass percent and 100%.

In addition to the above components, pigments, fillers, related auxiliaries and the like can be added to the coating composition, further improving the decorative and protective properties of the coating composition. The pigment and filler is one or more of carbon black, titanium dioxide, lamellar pearl powder and the like, and can be selectively added according to the required color; the auxiliary agent is one or two of organic bentonite, gas-phase silicon dioxide and the like.

The preparation steps of the environment-friendly polyarylethersulfone high-performance anticorrosive coating are as follows: dissolving the amino-containing polyether sulfone resin into a part of diluent at a stirring speed of 3500-4000 r/min, adding bisphenol S type epoxy resin, pigment filler and auxiliary agent, and grinding for 3-6 h in a sand mill; and adding the ether sulfone bond-containing aromatic amine curing agent and the rest of the diluent, stirring for 0.3-0.5 h, and curing to obtain the environment-friendly polyarylether sulfone high-performance anticorrosive coating.

The coating process of the environment-friendly polyarylethersulfone high-performance anticorrosive coating comprises the following steps: spraying the cured environment-friendly polyarylethersulfone high-performance anticorrosive paint onto a metal substrate subjected to sand blasting by using an air spray gun and an air compressor at one time, and drying at room temperature to 160 ℃ for 0.5-1 hour and at 160-220 ℃ for 1-2 hours to finish coating, wherein the thickness of the coating is 80-150 mu m.

The coatings produced by the above method require performance testing according to the following criteria and methods:

1. the adhesion of the coating of the template is tested with reference to GB/T1720-1979 "paint adhesion test".

2. The thickness of the coating of the panels was tested with reference to GB/T1764-1979 "paint thickness determination".

3. The hardness of the sample plate coating is tested by referring to GB/T6739-2006 paint film pencil hardness testing method.

4. The impact resistance of the sample plate coating is tested by referring to GB/T20624.1-2006 paint film impact resistance testing method.

5. The corrosion resistance of the template coating in chemical reagents is tested by referring to GB/T9274-1988 test for liquid-resistant medium of colored paint and varnish. Five chemical reagents of 10% sulfuric acid, 10% sodium hydroxide, 3.5% sodium chloride, toluene and butanone are selected as soaking media, after the five chemical reagents are soaked for a certain time, whether the coating has a leak point (namely whether the coating is damaged) or not is detected, and whether the coating has the phenomena of light loss, bubbling, falling off and the like or not is observed.

6. The corrosion resistance of the sample plate coating in neutral salt spray is tested by referring to a circulating salt spray corrosion resistance test box, the test condition is that 5% sodium chloride solution is used as electrolyte, the spray pressure is 8psi, the environmental temperature is 35 ℃, the sample plate is generally placed in the salt spray box in a manner of inclining 15 degrees, and corrosion phenomena such as foaming condition, rusting degree and the like of the sample plate are periodically recorded.

The environment-friendly polyarylethersulfone high-performance anticorrosive coating composition provided by the invention has the following advantages:

1. the 4, 4' -bis (4-aminophenoxy) diphenyl sulfone containing ether sulfone bond prepared by the invention is used as a curing agent of bisphenol S type epoxy resin, the molecular structure of the curing agent only contains benzene ring, ether bond, sulfone group and amino group, no low-temperature easily-decomposed group exists, and the temperature resistance is good; rigid groups such as benzene rings endow the coating with good mechanical properties, and flexible ether bonds provide certain flexibility and interaction with a base material; the amino groups provide crosslinking sites. Compared with a common curing agent, the bisphenol S type epoxy coating prepared by the method has more excellent adhesive force, temperature resistance, mechanical strength and corrosion resistance.

2. According to the invention, the polyether sulfone resin modified epoxy coating containing amino is added, the dispersion and compatibility of polyether sulfone play a role in determining the modification degree, and good compatibility can enable each component to exert respective excellent performance, so that the comprehensive performance of the coating is greatly improved, otherwise, poor compatibility can reduce the comprehensive performance of the coating. The amino group-containing polyethersulfone has the advantages that: (1) the epoxy coating has good self-performance, the molecular chain contains rigid benzene rings to endow the epoxy coating with strong hardness, the flexible ether bonds endow the epoxy coating with good flexibility and impact resistance, and in addition, the sulfone groups on the main chain and the formed large conjugated structure enable the epoxy coating to have strong stability, so that a certain complementary action can be formed with the epoxy coating, and the performances of the epoxy coating such as toughness and the like are improved to a certain extent. (2) The polyether sulfone containing amino is similar to the curing agent in molecular structure, has good compatibility with an epoxy coating, does not generate the problems of phase separation and the like, and fully exerts the excellent performance of the polyether sulfone containing amino; (3) the amino group of the amino polyether sulfone can also react with epoxy resin, so that the compatibility of the amino polyether sulfone in an epoxy resin system is further improved, and the crosslinking density of the coating is improved.

3. The aromatic amine curing agent containing the ether sulfone bond, the bisphenol S type epoxy resin and the amino-containing polyether sulfone resin prepared by the invention have similar aryl ether sulfone structures, so that the stability, heat resistance, flexibility, solvent resistance and long-term corrosion resistance of the composite coating are effectively improved.

4. The environment-friendly polyarylethersulfone high-performance anticorrosive coating prepared by the invention belongs to a high-solid coating, the solid content is 77-91%, and the environment-friendly polyarylethersulfone high-performance anticorrosive coating has the advantages that: (1) the coating contains a small amount of organic volatile solvent, saves solvent resources, is an environment-friendly coating, and meets the national environment-friendly requirement and future development trend; (2) the required film thickness can be achieved by single spraying, and the construction is simple and convenient.

5. The environment-friendly polyarylethersulfone high-performance anticorrosive coating prepared by the invention has excellent comprehensive performance, and the performance of the traditional epoxy coating is greatly improved: the 5% thermal weight loss temperature is 383-388 ℃; after 150 days of immersion, its | Z_0.01HZThe value of | is still 10¹¹Ωcm²The above; the effective salt fog duration is longer than 3000 hours, and the method can be suitable for severe working environment.

Drawings

FIG. 1: the synthetic schematic diagram of the aromatic amine curing agent containing the ether sulfone bond and the 4, 4' -bis (4-aminophenoxy) diphenyl sulfone.

FIG. 2: nuclear magnetic resonance hydrogen spectrum of 4, 4' -bis (4-aminophenoxy) diphenyl sulfone:¹H NMR(300MHz,DMSO)：δ5.10(s,H₁,4H)，δ7.78-7.90(d,H₂,4H)，δ6.92-7.08(d,H₃,4H)，δ6.55-6.66(d,H₄,4H)，δ6.75-6.85(d,H₅,4H)。

FIG. 3: infrared spectra of 4,4 '-diaminodiphenyl sulfone and 4, 4' -bis (4-aminophenoxy) diphenyl sulfone: 1236cm^-1Characteristic absorption peak corresponding to-O-, 1143cm^-1Corresponding to the characteristic absorption peak of S ═ O in the sulfone group, 3450cm^-1And 3337cm^-1An N-H stretching vibration peak appears.

FIG. 4: TGA profiles of the coatings prepared in comparative example 1 and example 3: the coating 5% thermal weight loss temperature in the comparative example 1 is 326 ℃, the coating 5% thermal weight loss temperature in the example 3 is 388 ℃, and the polyether sulfone resin is introduced into the bisphenol S type epoxy resin, so that the heat resistance of the coating is improved.

FIG. 5: electrochemical impedance test plots (soaked in 3.5 wt.% NaCl solution) for the composite coatings prepared from example 3. At the initial stage of soaking, the impedance diagram shows an approximate straight line with a slope of-1 and an impedance value of 10¹²Left and right. Coating after 120 days with the prolonged soaking timeThe resistance value of the layer is still kept at 10¹¹Much higher than 10⁶The excellent corrosion prevention effect of the composite coating is demonstrated.

FIG. 6: an interfacial electron microscopy image of the composite coating prepared from example 3. After the polyether sulfone resin is added into the bisphenol S epoxy resin coating, the internal structure of the coating begins to appear regularity, a laminated sheet structure is presented, and the cross section of the coating becomes finer and smoother

Detailed Description

Example 1:

0.20mol of dihydroxydiphenyl sulfone, 0.42mol of p-chloronitrobenzene and 0.42mol of potassium carbonate were added to 280mL of N, N-dimethylformamide solvent under nitrogen protection, and the reaction was refluxed at 135 ℃ for 8 hours. After the reaction is finished, cooling the system to room temperature, discharging the material, and pouring the material into a reactor with a volume ratio of 1:1, precipitating a yellow solid product in 1000mL of mixed solution of water and ethanol, repeatedly washing the filtered product with water to remove impurities, further recrystallizing with ethanol/water to obtain a light yellow product, namely 4, 4' -bis (4-nitrophenoxy) diphenyl sulfone, and drying in vacuum.

Under the protection of nitrogen, 0.2mol of the above product, 0.82g of palladium-carbon and 700mL of ethanol solvent are heated and refluxed, then an aqueous hydrazine hydrate solution (80 wt%, 70mL) in a dropping funnel is slowly dropped therein within 1.5 hours, and after the reflux is continued for 3 hours, the product is thermally filtered. Naturally separating out a product after the solution is cooled, and carrying out vacuum drying for 10 hours at the temperature of 80 ℃ to obtain a final product: 4, 4' -bis (4-aminophenoxy) diphenylsulfone, product mass 77.8 g.

Example 2:

0.20mol of dihydroxydiphenyl sulfone, 0.48mol of p-chloronitrobenzene and 0.48mol of potassium carbonate were added to 300mL of N, N-dimethylformamide solvent under nitrogen protection, and the reaction was refluxed at 155 ℃ for 10 hours. After the reaction is finished, cooling the system to room temperature, discharging the material, and pouring the material into a reactor with a volume ratio of 1:1, precipitating a yellow solid product in 1500mL of mixed solution of water and absolute ethyl alcohol, repeatedly washing the filtered product with water to remove impurities, further recrystallizing with ethanol/water to obtain a light yellow product, namely 4, 4' -bis (4-nitrophenoxy) diphenyl sulfone, and drying in vacuum.

Under the protection of nitrogen, 0.2mol of the product, 0.90g of palladium-carbon and 800mL of ethanol solvent are refluxed, then hydrazine hydrate (80 wt%, 85mL) in a dropping funnel is slowly dropped into the solution within 2 hours, and after the reflux is continued for 5 hours, the product is thermally filtered. Naturally separating out a product after the solution is cooled, and carrying out vacuum drying for 10 hours at the temperature of 80 ℃ to obtain a final product: 4, 4' -bis (4-aminophenoxy) diphenylsulfone, product mass 82.1 g.

Example 3:

under the stirring speed of 1500r/min, 16g of bisphenol S type epoxy resin (a compound shown in a structural formula (1)) is added into a composite diluent consisting of 2.5g of toluene and 1.5g of dibutyl alcohol, the rotation speed is increased to 2500r/min, and 4.0g of a mixture of 1:1 (structural formula (5)) and amino-terminated polyether sulfone resin (structural formula (6)), and stirring for 3 hours. Then, 4.8g of N, N '-dimethylacetamide and 8g of 4, 4' -bis (4-aminophenoxy) diphenylsulfone were added, and the mixture was stirred for 0.3 hour to effect aging. The coating composition comprises 43% of bisphenol S type epoxy resin, 22% of curing agent, 10% of amino polyether sulfone resin and the balance of diluent by mass and 100%.

Cleaning the steel plate subjected to sand blasting by using ethanol and acetone, drying, and uniformly spraying the coating on the steel plate by using an air spray gun and an air compressor. Drying at 120 ℃ for 1 hour and at 170 ℃ for 1 hour to obtain the coating.

Table 1: example 3 coating Performance data

Example 4:

adding 16g of a composite diluent consisting of 2.5g of toluene and 1.5g of dibutyl alcohol into a reactor at a stirring speed of 1500r/min, wherein the mass ratio of the mixture is 1:1 bisphenol S type epoxy resin (compound shown in structural formula (1)) and bisphenol S type epoxy resin (compound shown in structural formula (2)) are stirred for 3 hours, the rotating speed is increased to 2500r/min, 4.0g of polyether sulfone resin (compound shown in structural formula (5)) and amino-terminated polyether sulfone resin (compound shown in structural formula (6)) with amino side groups in a mass ratio of 1:1 are added. 4.8g of 4.8g N, N '-dimethylacetamide and 8g of 4, 4' -bis (4-aminophenoxy) diphenylsulfone were added thereto, and the mixture was stirred for 0.3 hour to effect aging. The coating composition contains 43% of bisphenol S type epoxy resin, 22% of curing agent, 10% of amino polyether sulfone resin and the balance of diluent.

Cleaning the steel plate subjected to sand blasting by using ethanol and acetone, drying, and uniformly spraying the coating on the steel plate by using an air spray gun and an air compressor. Drying for 1 hour at 130 ℃ and drying for 1 hour at 180 ℃ to obtain the coating.

Table 2: example 4 coating Performance data

Example 5:

under the stirring speed of 1500r/min, 16g of bisphenol S type epoxy resin (compound shown in structural formula (1)) and bisphenol S type epoxy resin (compound shown in structural formula (3)) in a mass ratio of 1:1 are added into a composite diluent consisting of 2.5g of toluene and 1.5g of dibutyl alcohol, the rotation speed is increased to 2500r/min, and 4.0g of a mixture with a mass ratio of 1:1 (structural formula (5)) and amino-terminated polyether sulfone resin (structural formula (6)), and stirring for 3 hours. 4.8g of 4.8g N, N '-dimethylacetamide and 8g of 4, 4' -bis (4-aminophenoxy) diphenylsulfone were added thereto, and the mixture was stirred for 0.3 hour to effect aging. The coating composition contains 43% of bisphenol S type epoxy resin, 22% of curing agent, 10% of amino polyether sulfone resin and the balance of diluent.

Cleaning the steel plate subjected to sand blasting by using ethanol and acetone, drying, and uniformly spraying the coating on the steel plate by using an air spray gun and an air compressor. Drying for 1 hour at 120 ℃ and 1 hour at 200 ℃ to obtain the coating.

Table 3: example 5 coating Performance data

Example 6:

16g of bisphenol S type epoxy resin (compound represented by structural formula (2)) and bisphenol S type epoxy resin (compound represented by structural formula (3)) are added into a composite diluent consisting of 2.5g of toluene and 1.5g of dibutyl alcohol at a stirring speed of 1500r/min, the mass ratio of the mixture is increased to 2500r/min, and 4.0g of a mixture of bisphenol S type epoxy resin (compound represented by structural formula (2)) and bisphenol S type epoxy resin (compound represented by structural formula (3)) are added, wherein the mass ratio of the mixture is 1:1 (structural formula (5)) and amino-terminated polyether sulfone resin (structural formula (6)), and stirring for 3 hours. 4.8g of 4.8g N, N '-dimethylacetamide and 8g of 4, 4' -bis (4-aminophenoxy) diphenylsulfone were added thereto, and the mixture was stirred for 0.3 hour to effect aging. The coating composition contains 43% of bisphenol S type epoxy resin, 22% of curing agent, 10% of amino polyether sulfone resin and the balance of diluent.

Cleaning the steel plate subjected to sand blasting by using ethanol and acetone, drying, and uniformly spraying the coating on the steel plate by using an air spray gun and an air compressor. Drying for 1 hour at 130 ℃ and 1 hour at 200 ℃ to obtain the coating.

Table 4: example 6 coating Performance data

Example 7:

16g of bisphenol S type epoxy resin (compound shown in structural formula (2)) and bisphenol S type epoxy resin (compound shown in structural formula (3)) are added into a composite diluent consisting of 2.5g of toluene and 1.5g of dibutyl alcohol at a stirring speed of 1500r/min, the mass ratio is 1:1, the rotating speed is increased to 2500r/min, 2.4g of polyether sulfone resin with amino side groups (compound shown in structural formula (5)), 0.5g of lamellar pearl powder and 0.5g of carbon black are added, and stirring is carried out for 3 hours. 4.8g of 4.8g N, N '-dimethylacetamide and 8g of 4, 4' -bis (4-aminophenoxy) diphenylsulfone were added thereto, and the mixture was stirred for 0.3 hour to effect aging. The coating composition contains 44% of bisphenol S type epoxy resin, 22% of curing agent, 7% of amino-containing polyether sulfone resin, 3% of pigment filler and the balance of diluent.

Cleaning the steel plate subjected to sand blasting by using ethanol and acetone, drying, and uniformly spraying the coating on the steel plate by using an air spray gun and an air compressor. Drying for 1 hour at 120 ℃ and 1 hour at 220 ℃ to obtain the coating.

Table 5: example 7 coating Performance data

Example 8:

16g of bisphenol S type epoxy resin (compound shown in structural formula (2)) and bisphenol S type epoxy resin (compound shown in structural formula (3)) are added into a composite diluent consisting of 2.5g of toluene and 1.5g of dibutyl alcohol at a stirring speed of 1500r/min, the mass ratio is 1:1, the rotating speed is increased to 2500r/min, 3.2g of amino-terminated polyether sulfone resin (compound shown in structural formula (6)), 0.5g of lamellar pearl powder and 0.5g of carbon black are added, and stirring is carried out for 3 hours. 4.8g of 4.8g N, N '-dimethylacetamide and 8g of 4, 4' -bis (4-aminophenoxy) diphenylsulfone were added thereto, and the mixture was stirred for 0.3 hour to effect aging. The coating composition contains 43% of bisphenol S type epoxy resin, 22% of curing agent, 9% of amino-containing polyether sulfone resin, 3% of pigment filler and the balance of diluent.

Cleaning the steel plate subjected to sand blasting by using ethanol and acetone, drying, and uniformly spraying the coating on the steel plate by using an air spray gun and an air compressor. Drying for 1 hour at 130 ℃ and drying for 1 hour at 220 ℃ to obtain the coating.

Table 6: example 8 coating Performance data

Example 9:

16g of bisphenol S type epoxy resin (compound represented by structural formula (2)) and bisphenol S type epoxy resin (compound represented by structural formula (3)) are added into a composite diluent consisting of 2.5g of toluene and 1.5g of dibutyl alcohol at a stirring speed of 1500r/min, the mass ratio of the mixture is increased to 2500r/min, and 3.2g of the mixture is added, wherein the mass ratio of the mixture is 1:1 (amino side group of polyether sulfone resin (compound shown in structural formula (5)) and amino end-capped polyether sulfone resin (compound shown in structural formula (6)), 0.5g of lamellar pearl powder, 0.5g of carbon black and 0.5g of organic bentonite, and stirring for 3 hours. 4.8g of 4.8g N, N '-dimethylacetamide and 8g of 4, 4' -bis (4-aminophenoxy) diphenylsulfone were added thereto, and the mixture was stirred for 0.3 hour to effect aging. The coating composition contains 43% of bisphenol S type epoxy resin, 21% of curing agent, 9% of amino-containing polyether sulfone resin, 3% of pigment filler, 1% of auxiliary agent and the balance of diluent.

Cleaning the steel plate subjected to sand blasting by using ethanol and acetone, drying, and uniformly spraying the coating on the steel plate by using an air spray gun and an air compressor. Drying for 1 hour at 130 ℃ and drying for 1 hour at 180 ℃ to obtain the coating.

Table 7: example 9 coating Performance data

Comparative example 1:

16g of bisphenol A epoxy resin (a compound represented by the structural formula (1)) was added to a composite diluent composed of 2.5g of toluene and 1.5g of dibutanol at a stirring speed of 1500r/min, and stirred for 1 hour. 1.2g of 1.2g N, N '-dimethylacetamide and 8g of 4, 4' -diaminodiphenyl sulfone were added thereto, and the mixture was stirred at room temperature for 0.3 hour to effect aging.

Cleaning the steel plate subjected to sand blasting by using ethanol and acetone, drying, and uniformly spraying the coating on the steel plate by using an air spray gun and an air compressor. Drying at 120 ℃ for 1 hour and at 170 ℃ for 1 hour to obtain the coating.

Table 8: comparative example 1 coating Performance data

Comparative example 2:

16g of bisphenol SA epoxy resin is added into a composite diluent consisting of 2.5g of toluene and 1.5g of dibutanol at the stirring speed of 1500r/min, and the mixture is stirred for 1 hour. 1.2g of 1.2g N, N '-dimethylacetamide and 8g of 4, 4' -diaminodiphenyl sulfone were added thereto, and the mixture was stirred at room temperature for 0.3 hour to effect aging.

Cleaning the steel plate subjected to sand blasting by using ethanol and acetone, drying, and uniformly spraying the coating on the steel plate by using an air spray gun and an air compressor. Drying for 1 hour at 130 ℃ and drying for 1 hour at 180 ℃ to obtain the coating.

The bisphenol A type epoxy resin used in comparative example 1 was inferior in hardness, adhesion, and impact resistance to the bisphenol S type epoxy resin used in comparative example 2. Compared with the 4,4 '-bis (4-aminophenoxy) diphenyl sulfone curing agent synthesized by the patent and used in the example 3, the common 4, 4' -diamino diphenyl sulfone curing agent used in the comparative example 1 has improved performances in the example 3.

Table 9: comparative example 2 coating Performance data