Heavy-duty coating industrial paint and preparation method thereof

Abstract

The present application relates to a kind of heavy-duty coating industry coating and preparation method, belong to the field of coating technology, the coating of the present application uses elastic epoxy organosilicon copolymer, diphenylmethane glycidyl ether epoxy resin, high-temperature-resistant hardening modified resin, polyphenylene sulfide resin, phenolic epoxy resin and polyurethane cyanide are as main raw material, with specific fusion agent system, curing agent system, functional filler system, functional additive system and solvent system, using special mixing preparation method, coating can realize "elastic-rigid balance", "crosslinking density optimization", "component dispersion uniformity", "reduce side reaction" and so on synergistic effect, improve the comprehensive performance such as coating adhesion, salt spray corrosion resistance, temperature resistance, water resistance and weather resistance.

Description

Technical Field

[0001] The present invention belongs to the technical field of coatings, and in particular relates to a heavy-duty anti-corrosion coating industrial coating and a preparation method thereof. Background Art

[0002] In the industrial sector, corrosion of metal structures is a long-standing and serious problem. From offshore oil platforms to urban bridges and pipelines in chemical plants, metal materials are widely used in various applications, yet they also face severe corrosion challenges. Corrosion not only reduces the strength and durability of metal materials, leading to equipment failures and safety hazards, but also causes significant economic losses.

[0003] Traditional anti-corrosion coatings have certain limitations in their protective performance. Conventional anti-corrosion coatings are generally suitable for ordinary corrosive environments. When faced with relatively harsh corrosive environments such as chemical atmospheres and marine environments, it is difficult to meet the needs of long-term protection. The dry film thickness of traditional anti-corrosion coatings is relatively thin, generally around 100μm or 150μm, which makes its protective ability for metals limited and cannot effectively prevent the invasion of corrosive media. In acid, alkali, salt and solvent media, and under certain temperature conditions, the service life of traditional anti-corrosion coatings is short, often difficult to reach more than 5 years, and requires frequent maintenance and recoating, which increases the cost of use and the investment of manpower and material resources.

[0004] To address these issues, heavy-duty anti-corrosion coatings can be used in relatively harsh corrosive environments and have a longer protection period than conventional anti-corrosion coatings. Thick film thickness is an important feature of heavy-duty anti-corrosion coatings, with dry film thickness typically exceeding 200μm, and some even reaching 2000μm, providing thicker and more durable protection for metals. Traditional heavy-duty anti-corrosion coatings, such as glass flake coatings, are used for corrosion protection in heavy-duty anti-corrosion projects and concrete-based facilities. With the continuous advancement of science and technology, significant progress has been made in the synthesis of new corrosion-resistant resins, the manufacture of new corrosion-resistant fillers, and the development of environmentally friendly and functional heavy-duty anti-corrosion coatings, which has promoted the continuous expansion of the application of heavy-duty anti-corrosion coatings.

[0005] Today, with the acceleration of industrial modernization, various industries are placing higher demands on the performance of heavy-duty anti-corrosion industrial coatings. On the one hand, in fields such as marine engineering and petrochemicals, equipment faces extremely complex environments such as high salt, high humidity, high temperature, and strong chemical corrosion, requiring coatings to possess superior corrosion resistance, weather resistance, temperature resistance, and water resistance to ensure long-term stable operation. On the other hand, increasing environmental awareness and increasingly stringent environmental regulations are driving the development of heavy-duty anti-corrosion coatings towards low-pollution, environmentally friendly products. Environmentally friendly products such as water-based heavy-duty anti-corrosion coatings and solvent-free heavy-duty anti-corrosion coatings have become a focus of research and development. Against this backdrop, heavy-duty anti-corrosion industrial coatings continue to innovate and develop, integrating multidisciplinary knowledge and continuously improving performance to meet the needs of various industries for metal structure protection. Summary of the Invention

[0006] In order to meet the market's higher requirements for heavy-duty anti-corrosion coating industrial coatings, improve the coating's corrosion resistance, weather resistance, temperature resistance, water resistance, etc., and reduce environmental pollution. The present invention provides a heavy-duty anti-corrosion coating industrial coating and a preparation method, using elastic epoxy silicone copolymer, diphenylmethane glycidyl ether epoxy resin, high-temperature resistant hardening modified resin, polyphenylene sulfide resin, phenolic epoxy resin and polyurethane cyanogen coagulant as main raw materials, combined with a specific fusion agent system, curing agent system, functional filler system, functional additive system and solvent system, and adopting a special mixing preparation method, the coating can achieve synergistic effects such as "elasticity-rigidity balance", "cross-linking density optimization", "uniformity of component dispersion", "reduction of side reactions", and improve the comprehensive performance of the coating. Its specific technical scheme is as follows:

[0007] A heavy-duty anti-corrosion coating industrial coating, the raw materials of the coating comprising, by weight, 25 to 30 parts of an elastic epoxy silicone copolymer, 15 to 20 parts of a diphenylmethane glycidyl ether epoxy resin, 10 to 15 parts of a high-temperature resistant hardening modified resin, 5 to 8 parts of a polyphenylene sulfide resin, 5 to 8 parts of a phenolic epoxy resin, 5 to 8 parts of a polyurethane cyanogen gel, a fusing agent system, a curing agent system, 25 to 30 parts of a functional filler system, a functional additive system, and the balance being 24 to 33 parts of a solvent system;

[0008] The fusion agent system includes 1 to 2 parts of ricinoleic acid amidopropyl dimethylamine, 0.5 to 1.5 parts of silane coupling agent, 3 to 5 parts of modified silicone oil, 0.1 to 0.3 parts of anti-cratering agent, 0.5 to 1 part of Teflon PTFE micropowder wax and 0.8 to 1.5 parts of polyamide modified hydrogenated castor oil derivative;

[0009] The curing agent system includes 5 to 8 parts of modified alicyclic amine epoxy resin curing agent, 4 to 6 parts of HDI trimer curing agent, 0.01 to 0.02 parts of A504 catalyst and 0.1 to 0.3 parts of Dyhard UR 500 curing agent;

[0010] The functional filler system includes hexagonal boron nitride, zinc phosphate, mica powder and talc;

[0011] The functional additive system includes 1 to 1.5 parts of a polymer block dispersant, 2 to 3 parts of a metal deactivator, 0.3 to 0.5 parts of an organosilicon defoamer, and 0.1 to 0.2 parts of a non-silicon defoamer.

[0012] The solvent system includes propylene glycol methyl ether acetate, dipropylene glycol methyl ether and D-ethyl lactate.

[0013] In the above coating, the functional filler system includes, by mass, 5 to 6 parts of hexagonal boron nitride, 10 to 12 parts of zinc phosphate, 5 to 6 parts of mica powder and 5 to 6 parts of talc.

[0014] In the above coating, the solvent system includes, by mass, 8 to 10 parts of propylene glycol methyl ether acetate, 6 to 8 parts of dipropylene glycol methyl ether, and 10 to 15 parts of D-ethyl lactate.

[0015] The above-mentioned method for preparing a heavy-duty anti-corrosion coating industrial coating comprises the following steps:

[0016] S1, preparation of component A: according to the mass fraction, under nitrogen protection, heat the solvent system of 45wt% to 50wt% of the total mass fraction to 45±3℃, add diphenylmethane glycidyl ether epoxy resin, phenolic epoxy resin, elastic epoxy silicone copolymer in sequence under stirring, stir and mix; add high temperature resistant hardening modified resin and polyphenylene sulfide resin in sequence, stir and mix, cool to below 35℃, add ricinoleic acid amide propyl dimethylamine, modified silicone oil, polyamide modified hydrogenated Stir and disperse castor oil derivatives and Teflon PTFE micropowder wax; add polyurethane cyanide coagulant and stir and mix; add polymer block dispersant and metal deactivator in sequence and stir and mix to obtain mixture A; add functional filler system to mixture A, disperse at high speed, and grind to a fineness of less than 20 μm to obtain dispersion B; add silane coupling agent and anti-crater agent in sequence to dispersion B and stir and mix; add organosilicon defoamer and non-silicon defoaming agent in sequence and stir and mix; vacuum degassing and filter to obtain component A;

[0017] S2, preparation of component B1: adding A504 catalyst, modified alicyclic amine epoxy resin curing agent, and HDI trimer curing agent in order according to weight parts under nitrogen protection to a solvent system of 35wt% to 40wt% of the total weight parts of the solvent system, stirring and mixing, vacuum degassing, and filtering to obtain component B1;

[0018] S3, preparation of component B2: dispersing Dyhard UR 500 curing agent in a solvent system with a total mass percentage of 10 wt% to 20 wt% of the total mass percentage of the solvent system under nitrogen protection to obtain component B2;

[0019] S4: When in use, evenly mix component A, component B1 and component B2, and allow to stand for aging to obtain a coating.

[0020] In S1 of the above preparation method, the stirring speed is 400 rpm to 500 rpm; diphenylmethane glycidyl ether epoxy resin, phenolic epoxy resin, and elastic epoxy silicone copolymer are added and stirred and mixed for 30 min to 40 min; high temperature resistant hardening modified resin and polyphenylene sulfide resin are added and stirred and mixed for 10 min to 20 min; ricinoleic acid amidopropyl dimethylamine, modified silicone oil, polyamide modified hydrogenated castor oil derivative, and Teflon PTFE micropowder wax are added and stirred and dispersed at 700 rpm to 800 rpm for 10 min to 20 min; polyurethane cyanogen coagulant is added and stirred and mixed at below 30°C and 400 rpm to 500 rpm for 10 min to 20 min; add polymer block dispersant and metal deactivator, stir and mix at 400rpm~500rpm for 10min~20min; add functional filler system to mixture A, high-speed disperse at 1000rpm~1200rpm below 40℃ for 30min~40min, grind to fineness of less than 20μm at 1200rpm~1500rpm below 40℃; add silane coupling agent and anti-crater agent, stir and mix at 400rpm~500rpm for 10min~15min; add silicone defoamer and non-silicon defoaming agent, stir and mix at 400rpm~500rpm for 10min~15min; filter through a 100-mesh to 150-mesh filter.

[0021] In S2 of the above preparation method, A504 catalyst, modified alicyclic amine epoxy resin curing agent, and HDI trimer curing agent are added, and the mixture is stirred and mixed at 500 rpm to 600 rpm for 30 min to 40 min; and filtered through a 100-150 mesh filter.

[0022] In S3 of the above preparation method, Dyhard UR 500 curing agent was added and the mixture was ground at 1200 rpm to 1500 rpm until the fineness was less than 15 μm.

[0023] In S4 of the above preparation method, component A, component B1 and component B2 are stirred and mixed at 600 rpm to 800 rpm for 5 to 8 minutes, and allowed to stand and mature for 10 to 15 minutes to obtain a coating.

[0024] In the above preparation method, component A, component B1 and component B2 are sealed and stored separately in the dark before use.

[0025] The present invention provides a heavy-duty anti-corrosion coating industrial coating and a preparation method thereof, which have the following beneficial effects:

[0026] 1. Using elastic epoxy silicone copolymer, diphenylmethane glycidyl ether epoxy resin, high-temperature hardening modified resin, polyphenylene sulfide resin, phenolic epoxy resin, and polyurethane cyanoacrylate in appropriate proportions can significantly enhance the overall performance of the coating. The elastic epoxy silicone copolymer provides excellent flexibility and weather resistance, while the diphenylmethane glycidyl ether epoxy resin has excellent adhesion and mechanical properties. The combination of these two allows the coating to maintain good adhesion while also possessing a certain degree of elasticity, adapting to diverse working environments. The high-temperature hardening modified resin enhances the coating's high-temperature resistance and hardness. Working synergistically with the elastic epoxy silicone copolymer and diphenylmethane glycidyl ether epoxy resin, the coating maintains structural stability and mechanical properties even at high temperatures. Polyphenylene sulfide resin has outstanding chemical stability, while phenolic epoxy resin exhibits excellent heat resistance and corrosion resistance. Together, these resins form a dense anti-corrosion coating that effectively blocks the substrate from corrosive media. Polyurethane cyanoacrylate exhibits excellent water resistance and sealing properties, further enhancing the coating's corrosion resistance and preventing the penetration of moisture and corrosive substances. The components are matched in proportion and various auxiliary ingredients are added to make the coating have good rheological properties and coating properties during the construction process, facilitate construction operation, and form a uniform and smooth coating, which is conducive to giving full play to the performance advantages of each component and improving the quality of the coating.

[0027] Among them, ricinoleic acid amidopropyl dimethylamine can improve the surface properties of the coating, and the modified silicone oil has good lubricity and defoaming properties. The two can work together to make the coating surface smoother, while helping to defoam and prevent surface defects.

[0028] Among them, the anti-crater agent prevents the formation of craters on the coating surface, and the polyamide-modified hydrogenated castor oil derivative can improve the rheology and thixotropy of the coating. The synergistic effect can make the coating better level during the construction process, prevent defects such as craters, and improve the flatness and quality of the coating.

[0029] Among them, the modified alicyclic amine epoxy resin curing agent cures the epoxy resin, improving the hardness and mechanical properties of the coating; the HDI trimer curing agent can enhance the weather resistance and chemical resistance of the coating; the Dyhard UR 500 curing agent can improve the curing effect and enhance the overall performance of the coating; the A504 catalyst accelerates the curing reaction, allowing the three curing agents to better play their role, synergistically making the cured coating have good mechanical properties, weather resistance, chemical resistance and other comprehensive properties.

[0030] 2. The present invention adopts propylene glycol methyl ether acetate, dipropylene glycol methyl ether and D-ethyl lactate as a composite solvent system based on the characteristics of each component, which has good solubility. Heating and stirring help diphenylmethane glycidyl ether epoxy resin, phenolic epoxy resin and elastic epoxy silicone copolymer to be better mixed.

[0031] 3. The present invention is designed to add various substances in a specific order: first add the main resin components such as diphenylmethane glycidyl ether epoxy resin, and stir and mix them at a relatively high temperature, which is conducive to their full dissolution and preliminary fusion to form a stable resin matrix. Then add the high-temperature resistant hardening modified resin, etc. At this time, the resin matrix has been formed and can be better wrapped and fused. After cooling, add the fusion agent system and other ingredients to avoid the influence of high temperature on the performance of these ingredients. At the same time, they can better play their role at the appropriate temperature. First prepare the mixture A and then add the functional filler system for high-speed dispersion and grinding, so that the filler can be evenly dispersed in the resin system that has been preliminarily mixed. Finally, add the silane coupling agent, etc., which can play its role in enhancing bonding strength and preventing shrinkage holes in the final stage of coating formation.

[0032] Sequential mixing ensures gradual compatibility between the resin and additives, reduces side reactions caused by conflicts between the ingredients, improves the homogeneity of the interpenetrating network, and enhances the overall effect. In particular, premature addition of polyurethane cyanoacrylate should be avoided because its active -NCO groups can react with epoxy resins and amine additives, consuming epoxy resin hydroxyl groups, degrading the structure, making the coating brittle, and reducing adhesion, which in turn affects other properties.

[0033] Fourth, the present invention divides the coating components into Component A, Component B1, and Component B2 and stores them separately to prevent premature reactions. Component A primarily contains various resins, fillers, and additives, while Components B1 and B2 primarily contain curing agents and related catalysts. Storing these separately prevents premature contact and reaction between the curing agent and the resin and other components before use, thereby ensuring the stability of each component, preventing curing and deterioration during storage, and extending the coating's shelf life.

[0034] By mixing the components in the prescribed proportions during use, the content of each ingredient in the coating can be precisely controlled, ensuring the consistency and stability of the coating's performance. Different application scenarios and requirements may require fine-tuning the coating's performance. By storing each component separately, the dosage can be flexibly adjusted according to actual conditions to meet different needs.

[0035] The separately stored components can be mixed at the construction site according to the actual construction progress and usage, and mixed as needed, avoiding the situation where a large amount of paint is mixed at one time, which may cause changes in paint properties or waste during the construction process, and improving the convenience and efficiency of construction.

[0036] In summary, the present invention achieves synergistic effects such as "elasticity-rigidity balance", "cross-linking density optimization", "uniformity of component dispersion", and "reduction of side reactions" by adjusting the resin, auxiliary agent, and curing agent components and processes, thereby improving the comprehensive performance of the coating. The preparation method is simple and easy and has good practicality. DETAILED DESCRIPTION

[0037] The present invention will be further described below with reference to specific implementation cases, but the present invention is not limited to these embodiments.

[0038] Example 1

[0039] A heavy-duty anti-corrosion coating industrial coating, the raw materials of the coating comprising, by weight, 25 parts of an elastic epoxy silicone copolymer, 15 parts of a diphenylmethane glycidyl ether epoxy resin, 10 parts of a high-temperature resistant hardening modified resin, 5 parts of a polyphenylene sulfide resin, 5 parts of a phenolic epoxy resin, 5 parts of a polyurethane cyanogen coagulant, a fusing agent system, a curing agent system, a functional filler system, a functional additive system, and the balance being a solvent system;

[0040] Among them, the fusing agent system includes 1 part of ricinoleic acid amide propyl dimethylamine, 0.5 parts of silane coupling agent, 3 parts of modified silicone oil, 0.1 parts of anti-cratering agent, 0.5 parts of Teflon PTFE micropowder wax and 0.8 parts of polyamide modified hydrogenated castor oil derivative; the curing agent system includes 5 parts of modified alicyclic amine epoxy resin curing agent, 4 parts of HDI trimer curing agent, 0.01 parts of A504 catalyst and 0.1 parts of Dyhard UR 500 curing agent; the functional filler system includes 5 parts of hexagonal boron nitride, 10 parts of zinc phosphate, 5 parts of mica powder and 5 parts of talc; the functional additive system includes 1 part of polymer block dispersant, 2 parts of metal deactivator, 0.3 parts of silicone defoaming agent and 0.1 parts of non-silicone defoaming agent; the solvent system includes 8 parts of propylene glycol methyl ether acetate, 6 parts of dipropylene glycol methyl ether and 10 parts of D-ethyl lactate.

[0041] The above-mentioned method for preparing a heavy-duty anti-corrosion coating industrial coating comprises the following steps:

[0042] S1, preparation of component A: according to the mass fraction, under nitrogen protection, heat 10.8 parts of the solvent system to 42 ° C, and add diphenylmethane glycidyl ether epoxy resin, phenolic epoxy resin, and elastic epoxy silicone copolymer in sequence under stirring at 400 rpm, and stir and mix at 400 rpm for 40 minutes; add high temperature resistant hardening modified resin and polyphenylene sulfide resin in sequence, and stir and mix at 400 rpm for 20 minutes, cool to 30 ° C, add ricinoleic acid amide propyl dimethylamine, modified silicone oil, polyamide modified hydrogenated castor oil derivative, and Teflon PTFE micro powder wax in sequence, and stir and disperse at 700 rpm for 20 minutes; add polyurethane cyanogen condensate, and heat at 26 ° C. , 400 rpm and stirred for 20 minutes; polymer block dispersant and metal deactivator were added in sequence, and stirred for 20 minutes at 400 rpm to obtain mixture A; functional filler system was added to mixture A, and high-speed dispersion was carried out at 30°C and 1000 rpm for 40 minutes, and the mixture was ground at 30°C and 1200 rpm to a fineness of less than 15 μm to obtain dispersion B; silane coupling agent and anti-crater agent were added to dispersion B in sequence, and stirred for 15 minutes at 400 rpm; silicone defoamer and non-silicon defoamer were added in sequence, and stirred for 15 minutes at 400 rpm; vacuum degassing was carried out, and the mixture was filtered through a 150-mesh filter to obtain component A, which was sealed and stored in a dark place;

[0043] S2, preparation of component B1: under nitrogen, add A504 catalyst, modified alicyclic amine epoxy resin curing agent, and HDI trimer curing agent to 8.4 parts of solvent system in order by weight, stir and mix at 500 rpm for 40 min, degas under vacuum, filter through 150 mesh filter to obtain component B1, and store in a sealed container away from light;

[0044] S3, preparation of component B2: Disperse Dyhard UR 500 curing agent in 4.8 parts of solvent system by weight under nitrogen protection to obtain component B2, and store in a sealed container away from light;

[0045] S4: When in use, the mixture was stirred at 600 rpm for 8 minutes, and allowed to stand for 10 minutes to obtain a coating.

[0046] Example 2

[0047] A heavy-duty anti-corrosion coating industrial coating, the raw materials of the coating comprising, by weight, 28 parts of an elastic epoxy silicone copolymer, 17 parts of a diphenylmethane glycidyl ether epoxy resin, 13 parts of a high-temperature resistant hardening modified resin, 6.5 parts of a polyphenylene sulfide resin, 7 parts of a phenolic epoxy resin, 6.5 parts of a polyurethane cyanoacrylate coagulant, a fusing agent system, a curing agent system, a functional filler system, a functional additive system, and the balance being a solvent system;

[0048] Among them, the fusing agent system includes 1.5 parts of ricinoleic acid amidopropyl dimethylamine, 1 part of silane coupling agent, 4 parts of modified silicone oil, 0.2 parts of anti-cratering agent, 0.8 parts of Teflon PTFE micropowder wax and 1.2 parts of polyamide modified hydrogenated castor oil derivative; the curing agent system includes 6.5 parts of modified alicyclic amine epoxy resin curing agent, 5 parts of HDI trimer curing agent, 0.015 parts of A504 catalyst and 0.2 parts of Dyhard UR 500 curing agent; the functional filler system includes 5.5 parts of hexagonal boron nitride, 11 parts of zinc phosphate, 5.5 parts of mica powder and 5.5 parts of talc; the functional auxiliary agent system includes 1.2 parts of polymer block dispersant, 2.5 parts of metal deactivator, 0.4 parts of silicone defoaming agent and 0.15 parts of non-silicone defoaming agent; the solvent system includes 9 parts of propylene glycol methyl ether acetate, 7 parts of dipropylene glycol methyl ether and 12 parts of D-ethyl lactate.

[0049] The above-mentioned method for preparing a heavy-duty anti-corrosion coating industrial coating comprises the following steps:

[0050] S1, preparation of component A: according to the mass fraction, under nitrogen protection, heat 13.44 parts of the solvent system to 45 ° C, and add diphenylmethane glycidyl ether epoxy resin, phenolic epoxy resin, and elastic epoxy silicone copolymer in sequence under stirring at 450 rpm, and stir and mix at 450 rpm for 35 minutes; add high temperature resistant hardening modified resin and polyphenylene sulfide resin in sequence, and stir and mix at 450 rpm for 15 minutes, cool to 32 ° C, add ricinoleic acid amide propyl dimethylamine, modified silicone oil, polyamide modified hydrogenated castor oil derivative, and Teflon PTFE micropowder wax in sequence, and stir and disperse at 750 rpm for 15 minutes; add polyurethane cyanogen condensate, and heat at 28 ° C, 450 rpm. m, stirred and mixed for 15 minutes; a polymer block dispersant and a metal deactivator were added in sequence, and the mixture was stirred and mixed at 450 rpm for 15 minutes to obtain a mixture A; a functional filler system was added to the mixture A, and high-speed dispersion was carried out at 32°C and 1100 rpm for 35 minutes, and the mixture was ground at 32°C and 1300 rpm to a fineness of less than 18 μm to obtain a dispersion B; a silane coupling agent and an anti-crater agent were added to the dispersion B in sequence, and the mixture was stirred and mixed at 450 rpm for 12 minutes; an organosilicon defoamer and a non-silicon defoaming agent were added in sequence, and the mixture was stirred and mixed at 450 rpm for 12 minutes; vacuum degassing was carried out, and the mixture was filtered through a 150-mesh filter to obtain component A, which was sealed and stored in a dark place;

[0051] S2, preparation of component B1: under nitrogen, add A504 catalyst, modified alicyclic amine epoxy resin curing agent, and HDI trimer curing agent to 10.64 parts of the solvent system in order by weight, stir and mix at 550 rpm for 35 min, deaerate under vacuum, filter through a 100-mesh filter to obtain component B1, and store in a sealed container away from light;

[0052] S3, preparation of component B2: Disperse Dyhard UR 500 curing agent in 3.92 parts of solvent system by weight under nitrogen to obtain component B2, and store in a sealed container away from light;

[0053] S4: When in use, the mixture was stirred at 750 rpm for 6 minutes, and allowed to stand for 12 minutes to obtain a coating.

[0054] Example 3

[0055] A heavy-duty anti-corrosion coating industrial coating, the raw materials of the coating comprising, by weight, 30 parts of an elastic epoxy silicone copolymer, 20 parts of a diphenylmethane glycidyl ether epoxy resin, 15 parts of a high-temperature resistant hardening modified resin, 8 parts of a polyphenylene sulfide resin, 8 parts of a phenolic epoxy resin, 8 parts of a polyurethane cyanogen coagulant, a fusing agent system, a curing agent system, a functional filler system, a functional additive system, and the balance being a solvent system;

[0056] Among them, the fusing agent system includes 2 parts of ricinoleic acid amidopropyl dimethylamine, 1.5 parts of silane coupling agent, 5 parts of modified silicone oil, 0.3 parts of anti-cratering agent, 1 part of Teflon PTFE micropowder wax and 1.5 parts of polyamide modified hydrogenated castor oil derivative; the curing agent system includes 8 parts of modified alicyclic amine epoxy resin curing agent, 6 parts of HDI trimer curing agent, 0.02 parts of A504 catalyst and 0.3 parts of Dyhard UR 500 curing agent; the functional filler system includes 6 parts of hexagonal boron nitride, 12 parts of zinc phosphate, 6 parts of mica powder and 6 parts of talc; the functional additive system includes 1.5 parts of polymer block dispersant, 3 parts of metal deactivator, 0.5 parts of silicone defoaming agent and 0.2 parts of non-silicone defoaming agent; the solvent system includes 10 parts of propylene glycol methyl ether acetate, 8 parts of dipropylene glycol methyl ether and 15 parts of D-ethyl lactate.

[0057] The above-mentioned method for preparing a heavy-duty anti-corrosion coating industrial coating comprises the following steps:

[0058] S1, preparation of component A: according to the mass fraction, under nitrogen protection, heat 16.5 parts of the solvent system to 48 ° C, and add diphenylmethane glycidyl ether epoxy resin, phenolic epoxy resin, and elastic epoxy silicone copolymer in sequence under stirring at 500 rpm, and stir and mix at 500 rpm for 30 minutes; add high temperature resistant hardening modified resin and polyphenylene sulfide resin in sequence, and stir and mix at 500 rpm for 10 minutes, cool to 34 ° C, add ricinoleic acid amide propyl dimethylamine, modified silicone oil, polyamide modified hydrogenated castor oil derivative, and Teflon PTFE micropowder wax in sequence, and stir and disperse at 800 rpm for 10 minutes; add polyurethane cyanogen condensate, and heat at 29 ° C. , 500 rpm and stirred for 10 minutes; polymer block dispersant and metal deactivator were added in sequence, and stirred for 10 minutes at 500 rpm to obtain mixture A; functional filler system was added to mixture A, and high-speed dispersion was carried out at 36°C and 1200 rpm for 30 minutes, and the mixture was ground at 36°C and 1500 rpm to a fineness of less than 20 μm to obtain dispersion B; silane coupling agent and anti-crater agent were added to dispersion B in sequence, and stirred for 10 minutes at 500 rpm; silicone defoamer and non-silicon defoamer were added in sequence, and stirred for 10 minutes at 500 rpm; vacuum degassing was carried out, and the mixture was filtered through a 100-mesh filter to obtain component A, which was sealed and stored in a dark place;

[0059] S2, preparation of component B1: under nitrogen, add A504 catalyst, modified alicyclic amine epoxy resin curing agent, and HDI trimer curing agent to 13.2 parts of solvent system in order by weight, stir and mix at 600 rpm for 30 min, vacuum deaerate, filter through a 100-mesh filter to obtain component B1, and store in a sealed container away from light;

[0060] S3, preparation of component B2: Disperse Dyhard UR 500 curing agent in 3.3 parts of solvent system by weight under nitrogen protection to obtain component B2, and store in a sealed container away from light;

[0061] S4: When in use, the mixture was stirred at 800 rpm for 5 minutes, and allowed to stand for 15 minutes to obtain a coating.

[0062] Sources of raw materials in the above embodiments: elastic epoxy silicone copolymer is from Evonik Specialty Chemicals (Shanghai) Co., Ltd., model ALBIFLEX 297. Diphenylmethane glycidyl ether epoxy resin is from Huizhou Sanhua Electronic Insulation Materials Co., Ltd., model AG-80. High-temperature resistant hardening modified resin is from Guangdong Shanjin New Materials Co., Ltd., model SJ-32B. Polyphenylene sulfide resin is from Dongguan Shengli New Materials Co., Ltd., specification model SL-PPS2000. Phenolic epoxy resin is Olin DEN 438 phenolic epoxy resin. Polyurethane cyanide is from Yantai Caihua Polyurethane Technology Co., Ltd., model shp105. Ricinoleic acid amide propyl dimethylamine is from Jinjinle Chemical Co., Ltd. Silane coupling agent is KH-560, from Dongguan Shanyi Plastic Co., Ltd. Modified silicone oil is Shin-Etsu X-22-164AS modified silicone oil. Anti-cratering agent is BYK-141 silicone surface additive. Teflon PTFE micropowder wax, model DuPont MP1400. Polyamide-modified hydrogenated castor oil derivative, model Cray vallac MT, from Arkema (Shanghai) Chemical Co., Ltd. Modified alicyclic amine epoxy resin curing agent, model WSG-228, from Guangzhou Wanhua New Materials Technology Co., Ltd. HDI trimer curing agent, model Desmo dur N3300, from Shandong Moore Chemical Co., Ltd. A504 catalyst is King Industries' high-efficiency A504 catalyst, distributed by Shanghai Kaiyin Chemical Co., Ltd. Dyhard UR 500 curing agent is Degussa's epoxy resin curing agent Dyhard UR 500, distributed by Guangzhou Haoyi Chemical Technology Co., Ltd. Hexagonal boron nitride, model NO-N-003-1, from Shanghai Naiona Nanotechnology Co., Ltd. Zinc phosphate, model ZP-60, from Kelifang New Materials Co., Ltd. Mica powder, model WJ-6, from Chuzhou Baota Sericite Mining Co., Ltd. Talc powder was sourced from Lingshou County Chuangwei Mineral Products Processing Plant, 800 mesh. Polymer block dispersant was sourced from Shanghai Hongtu Industrial Co., Ltd., HTK-6096 polymer block dispersant. Metal deactivator was sourced from Jinzhou Runzhifeng Chemical Co., Ltd., a benzotriazole derivative, model T55101. BYK-066N silicone defoamer was used. TEGO Airex 920 was used as a non-silicone defoamer. Propylene glycol methyl ether acetate was sourced from Shandong Jintai Hongfa Biotechnology Co., Ltd. Dipropylene glycol methyl ether was sourced from Shandong Jintai Hongfa Biotechnology Co., Ltd. Ethyl D-lactate was sourced from Shandong Gaotai Chemical Technology Co., Ltd.

[0063] Comparative Example 1

[0064] In the coating, 15 parts of the elastic epoxy silicone copolymer and 25 parts of the diphenylmethane glycidyl ether epoxy resin were added; other parameters and methods were the same as in Example 1.

[0065] Comparative Example 2

[0066] In the coating, 10 parts of elastic epoxy silicone copolymer and 25 parts of high-temperature resistant hardening modified resin were added; other parameters and methods were the same as in Example 1.

[0067] Comparative Example 3

[0068] The coating contains 5 parts of diphenylmethane glycidyl ether epoxy resin and 20 parts of high-temperature resistant hardening modified resin; other parameters and methods are the same as in Example 1.

[0069] Comparative Example 4

[0070] The coating contains 0 parts of polyphenylene sulfide resin and 10 parts of phenolic epoxy resin; other parameters and methods are the same as those in Example 1.

[0071] Comparative Example 5

[0072] The coating contains 10 parts of polyphenylene sulfide resin and 0 parts of phenolic epoxy resin; other parameters and methods are the same as those in Example 1.

[0073] Comparative Example 6

[0074] In the coating, ricinoleic acid amidopropyl dimethylamine was not added to the flux system; other parameters and methods were the same as in Example 1.

[0075] Comparative Example 7

[0076] In the coating, no modified silicone oil was added to the flux system; other parameters and methods were the same as in Example 1.

[0077] Comparative Example 8

[0078] In the coating, ricinoleic acid amidopropyl dimethylamine and modified silicone oil are not added to the flux system; other parameters and methods are the same as in Example 1.

[0079] Comparative Example 9

[0080] In the coating, the anti-crater agent and the polyamide-modified hydrogenated castor oil derivative are not added to the fusing agent system; other parameters and methods are the same as those in Example 1.

[0081] Comparative Example 10

[0082] In the fusing agent system, the following components are in excess: 4 parts of ricinoleic acid amidopropyl dimethylamine, 8 parts of modified silicone oil, 1 part of anti-crater agent, and 4 parts of polyamide-modified hydrogenated castor oil derivative; other parameters and methods are the same as in Example 1.

[0083] Comparative Example 11

[0084] In the coating, the curing agent system does not add the modified alicyclic amine epoxy resin curing agent; other parameters and methods are the same as in Example 1.

[0085] Comparative Example 12

[0086] In the coating, no HDI trimer curing agent was added to the curing agent system; other parameters and methods were the same as in Example 1.

[0087] Comparative Example 13

[0088] In the coating, the curing agent system does not add the A504 catalyst; other parameters and methods are the same as in Example 1.

[0089] Comparative Example 14

[0090] In the coating, the curing agent system did not add Dyhard UR 500 curing agent; other parameters and methods were the same as in Example 1.

[0091] Comparative Example 15

[0092] In the coating, the functional additive system does not include a polymer block dispersant; other parameters and methods are the same as in Example 1.

[0093] Comparative Example 16

[0094] The coating preparation method comprises the following steps: in the preparation of component A, the mixture A is not mixed in sequence, all the components of the mixture A are added simultaneously, and the mixture is stirred and mixed at 35° C. and 500 rpm for 120 minutes to obtain the mixture A; a functional filler system is added to the mixture A, and the mixture is dispersed at high speed at 30° C. and 1000 rpm for 40 minutes, and ground at 30° C. and 1200 rpm to a fineness of less than 15 μm to obtain a dispersion B; a silane coupling agent and an anti-crater agent are sequentially added to the dispersion B, and the mixture is stirred and mixed at 400 rpm for 15 minutes; a silicone defoamer and a non-silicon defoaming agent are sequentially added, and the mixture is stirred and mixed at 400 rpm for 15 minutes; vacuum degassing is performed, and the mixture is filtered through a 150-mesh filter to obtain component A; other parameters and methods are the same as those in Example 1.

[0095] 1. Adhesion test:

[0096] Sample preparation: A Q235 carbon steel specimen with a size of 100 mm × 100 mm × 2 mm was selected, the coating film thickness was controlled at 250 ± 10 μm, and cured for 7 days in a standard environment (temperature 23 ± 2°C, relative humidity 50 ± 5%).

[0097] Test method: In accordance with GB / T 9286 "Scratch test for paints and varnishes", use a scratcher to scratch a 1mm x 1mm grid on the surface of the coating film, with the grid depth reaching the substrate. Then, use 3M tape (type 600) to stick on the grid area. Quickly tear off the tape in a direction perpendicular to the coating surface and observe the coating shedding.

[0098] grade describe Quantitative indicators (mesh shedding %) 0 Completely smooth edges, no shedding 0％ 1 Slight shedding at the intersection of the incisions >0% and ≤5% 2 The edge of the incision is peeling off and not forming a piece >5% and ≤15% 3 Localized shedding >15% and ≤35% 4 Large-scale shedding >35% and ≤65% 5 Completely fallen off ＞65％

[0099] 2. Corrosion resistance test:

[0100] Sample preparation: Same as sample preparation for adhesion test.

[0101] Detection method: Use salt spray test, put the prepared sample into the salt spray test box, the salt solution is 6wt% sodium chloride solution, the test temperature is 35℃, spray continuously, take out the sample after 3000h, and observe the rust, blistering, peeling and other phenomena on the coating surface.

[0102]

[0103]

[0104] 3. Temperature resistance test:

[0105] Sample preparation: Same as sample preparation for adhesion test.

[0106] Testing method: Place the sample in a high-temperature aging box, raise the temperature from room temperature to 200°C at a heating rate of 5°C / min, maintain for 48 hours, and observe whether the coating surface shows cracking, peeling, discoloration, etc.

[0107] grade describe Quantitative indicators 0 No cracking, slight discoloration (ΔE<1) Weight loss rate ≤0.5% 1 Slight discoloration (ΔE=1-2) Weight loss rate>0.5% and ≤1% 2 Obvious discoloration (ΔE=2-3) Weight loss rate>1% and ≤2% 3 Local microcracks Weight loss rate>2% and ≤3% 4 Web-like cracks or blistering Weight loss rate>3% and ≤5% 5 Coating powdering and falling off Weight loss rate>5%

[0108] 4. Water resistance test:

[0109] Sample preparation: Same as sample preparation for adhesion test.

[0110] Test method: Immerse the sample completely in deionized water at 25°C, with the water level 20mm above the sample. After 1000 hours of immersion, remove the sample and observe whether the coating surface shows any signs of blistering, peeling, discoloration, or loss of gloss.

[0111]

[0112]

[0113] 5. Weather resistance test

[0114] Sample preparation: Same as sample preparation for adhesion test.

[0115] Test method: Artificial accelerated aging test is adopted according to GB / T 1865 "Paints and varnishes - Artificial weathering and artificial radiation exposure (filtered xenon arc radiation)". The sample is placed in a xenon lamp aging test chamber and the irradiance is controlled at 0.55W / (m 2 ·nm), wavelength 340nm, blackboard temperature 65℃, relative humidity 65%, after continuous aging for 720h, observe the powdering, discoloration, cracking and other phenomena on the coating surface.

[0116]

[0117] There were 3 parallel samples for each test, and the average test results are shown in Table 1 below:

[0118] Table 1 Test results

[0119]

[0120]

[0121] From the above results, it can be seen that the coatings of Examples 1 to 3 have excellent adhesion, salt spray corrosion resistance, temperature resistance, water resistance and weather resistance through the reasonable proportions of the various components and synergistic effects.

[0122] Comparative Example 1 (Reduced content of elastomeric epoxy silicone copolymer and increased content of diphenylmethane glycidyl ether epoxy resin): While the elastomeric epoxy silicone copolymer provides flexibility and weather resistance, a reduced content of the copolymer results in a decreased crosslink density and increased brittleness. While diphenylmethane glycidyl ether epoxy resin improves rigidity, an excessive amount of it can increase internal stress and reduce adhesion.

[0123] Comparative Example 2 (reduced elastic epoxy silicone copolymer, increased high-temperature hardening resin): The high-temperature hardening resin increased hardness but reduced toughness. The lack of elastic components led to cracking in the coating. At high temperatures (temperature resistance test), the weight loss rate increased due to the mismatch in thermal expansion coefficients of the rigid structure. Corrosion resistance was also affected by the poor coating structure, which acted as a channel for corrosive media and resulted in increased blistering.

[0124] Comparative Example 3 (reduced diphenylmethane glycidyl ether epoxy resin and increased high-temperature hardening resin): Insufficient epoxy resin content resulted in an incomplete crosslinking network, while excessive high-temperature resin embrittled the coating. In salt spray testing, increased porosity allowed the penetration of corrosive media and increased blistering. Water resistance decreased due to coating density, and the blistering area increased after water absorption.

[0125] Comparative Examples 4 and 5 (adjusted ratio of polyphenylene sulfide resin to epoxy novolac resin): Polyphenylene sulfide resin provides chemical stability, while epoxy novolac resin enhances heat resistance; their combined use creates a synergistic effect. The absence of a single component leads to an imbalance in overall performance.

[0126] Comparative Examples 6 to 8 (lacking ricinoleamide propyl dimethylamine and / or modified silicone oil): Ricinoleamide propyl dimethylamine provides interfacial compatibility with the substrate, while the modified silicone oil improves coating leveling. Their absence can lead to internal stress concentration or surface defects in the coating. Comparative Example 8, which lacks both, significantly deteriorates overall performance.

[0127] Comparative Example 9 (lacking an anti-cratering agent and a polyamide-modified hydrogenated castor oil derivative): The anti-cratering agent eliminates uneven surface tension in the coating, while the polyamide derivative enhances filler dispersion. Its absence results in a porous coating surface and filler aggregation, reducing barrier properties such as corrosion resistance.

[0128] Comparative Example 10 (Excessive Fusing Agent): Excessive surfactant (ricinoleamide propyl dimethylamine) resulted in internal bubbles and reduced compatibility, while excessive silicone oil reduced crosslink density. Adhesion declined due to loose coating structure, and corrosion resistance decreased due to blistering caused by through-pores. All performance properties were affected and degraded.

[0129] Comparative Examples 11 and 12 (missing either the modified alicyclic amine epoxy resin curing agent or the HDI trimer curing agent): The modified alicyclic amine epoxy resin curing agent provides room-temperature curing crosslinking points, while the HDI trimer enhances the chemical crosslink density. The absence of either the modified alicyclic amine epoxy resin curing agent results in insufficient crosslinking, softening the coating, and making it susceptible to penetration by corrosive media.

[0130] Comparative Examples 13 and 14 (lacking A504 catalyst or Dyhard UR 500 curing agent): The A504 catalyst accelerates the curing reaction and improves the cured structure, while Dyhard UR 500 promotes deep crosslinking. Their absence results in residual solvent in uncured areas within the coating, causing water absorption, swelling, and blistering during water resistance testing, and also deteriorating other properties.

[0131] Comparative Example 15 (missing polymer block dispersant): The dispersant ensures uniform distribution of the filler. The absence of the dispersant causes the filler to agglomerate and form stress concentration points. The adhesion falls off due to the decrease in interfacial bonding strength. The weather resistance accelerates pulverization due to the exposure of the filler. The uneven dispersion of the ingredients also affects the uneven cross-linking structure, which in turn leads to insufficient overall performance.

[0132] Comparative Example 17 (Mixture A was mixed in no particular order): Mixing in a particular order ensures gradual compatibility between the resin and the additives, reduces side reactions caused by conflicts between the components, improves the homogeneity of the interpenetrating network, and enhances the overall effect. Adding all the components of Mixture A simultaneously can cause material mixing conflicts. In particular, polyurethane cyanoacrylate should not be added prematurely because its active -NCO groups can react with epoxy resins, amine additives, and other additives, leading to the consumption of epoxy resin hydroxyl groups, structural degradation, brittle coating, and decreased adhesion, which in turn affects other properties.

[0133] Summary: By adjusting the resin, additives, curing agent components or processes, each comparative example destroyed the synergistic effects of "elasticity-rigidity balance", "cross-linking density optimization", "uniformity of component dispersion", "reduction of side reactions" and so on in the examples, resulting in a decrease in overall performance.

Claims

1. A heavy-duty anti-corrosion coating industrial coating, characterized in that: The raw materials of the coating include: in parts by mass, 25 to 30 parts of elastic epoxy silicone copolymer, 15 to 20 parts of diphenylmethane glycidyl ether epoxy resin, 10 to 15 parts of high-temperature resistant hardening modified resin, 5 to 8 parts of polyphenylene sulfide resin, 5 to 8 parts of phenolic epoxy resin, 5 to 8 parts of polyurethane cyanogen gel, fusion agent system, curing agent system, 25 to 30 parts of functional filler system, functional auxiliary agent system, and the balance is 24 to 33 parts of solvent system; The fusion agent system includes 1 to 2 parts of ricinoleic acid amidopropyl dimethylamine, 0.5 to 1.5 parts of silane coupling agent, 3 to 5 parts of modified silicone oil, 0.1 to 0.3 parts of anti-cratering agent, 0.5 to 1 part of Teflon PTFE micropowder wax and 0.8 to 1.5 parts of polyamide modified hydrogenated castor oil derivative; The curing agent system includes 5 to 8 parts of modified alicyclic amine epoxy resin curing agent, 4 to 6 parts of HDI trimer curing agent, 0.01 to 0.02 parts of A504 catalyst and 0.1 to 0.3 parts of Dyhard UR 500 curing agent; The functional filler system includes hexagonal boron nitride, zinc phosphate, mica powder and talc; The functional additive system includes 1 to 1.5 parts of a polymer block dispersant, 2 to 3 parts of a metal deactivator, 0.3 to 0.5 parts of an organosilicon defoamer, and 0.1 to 0.2 parts of a non-silicon defoamer. The solvent system includes propylene glycol methyl ether acetate, dipropylene glycol methyl ether and D-ethyl lactate.

2. A heavy-duty anti-corrosion coating industrial coating according to claim 1, characterized in that: Calculated by mass, the functional filler system includes 5 to 6 parts of hexagonal boron nitride, 10 to 12 parts of zinc phosphate, 5 to 6 parts of mica powder and 5 to 6 parts of talc.

3. The heavy-duty anti-corrosion coating industrial coating according to claim 1, characterized in that: Calculated by mass, the solvent system includes 8 to 10 parts of propylene glycol methyl ether acetate, 6 to 8 parts of dipropylene glycol methyl ether, and 10 to 15 parts of D-ethyl lactate.

4. The method for preparing a heavy-duty anti-corrosion coating industrial coating according to claim 1, characterized in that: The steps include: S1, preparation of component A: according to the mass fraction, under nitrogen protection, heat the solvent system of 45wt% to 50wt% of the total mass fraction to 45±3℃, add diphenylmethane glycidyl ether epoxy resin, phenolic epoxy resin, elastic epoxy silicone copolymer in sequence under stirring, stir and mix; add high temperature resistant hardening modified resin and polyphenylene sulfide resin in sequence, stir and mix, cool to below 35℃, add ricinoleic acid amide propyl dimethylamine, modified silicone oil, polyamide modified hydrogenated Stir and disperse castor oil derivatives and Teflon PTFE micropowder wax; add polyurethane cyanide coagulant and stir and mix; add polymer block dispersant and metal deactivator in sequence and stir and mix to obtain mixture A; add functional filler system to mixture A, disperse at high speed, and grind to a fineness of less than 20 μm to obtain dispersion B; add silane coupling agent and anti-crater agent in sequence to dispersion B and stir and mix; add organosilicon defoamer and non-silicon defoaming agent in sequence and stir and mix; vacuum degassing and filter to obtain component A; S2, preparation of component B1: adding A504 catalyst, modified alicyclic amine epoxy resin curing agent, and HDI trimer curing agent in order according to weight parts under nitrogen protection to a solvent system of 35wt% to 40wt% of the total weight parts of the solvent system, stirring and mixing, vacuum degassing, and filtering to obtain component B1; S3, preparation of component B2: dispersing Dyhard UR 500 curing agent in a solvent system with a total mass percentage of 10 wt% to 20 wt% of the total mass percentage of the solvent system under nitrogen protection to obtain component B2; S4: When in use, evenly mix component A, component B1 and component B2, and allow to stand for aging to obtain a coating.

5. The method for preparing a heavy-duty anti-corrosion coating industrial coating according to claim 4, characterized in that: In S1, under stirring at 400 rpm to 500 rpm, add diphenylmethane glycidyl ether epoxy resin, phenolic epoxy resin, and elastic epoxy silicone copolymer, and stir and mix for 30 min to 40 min; add high temperature resistant hardening modified resin and polyphenylene sulfide resin, and stir and mix for 10 min to 20 min; add ricinoleic acid amidopropyl dimethylamine, modified silicone oil, polyamide modified hydrogenated castor oil derivative, and Teflon PTFE micropowder wax, and stir and disperse at 700 rpm to 800 rpm for 10 min to 20 min; add polyurethane cyanoacrylate, and stir and mix at below 30°C and 400 rpm to 500 rpm for 10 min to 20 min; Add a polymer block dispersant and a metal deactivator, stir and mix at 400 rpm to 500 rpm for 10 to 20 minutes; add a functional filler system to the mixture A, disperse it at a high speed of 1000 rpm to 1200 rpm for 30 to 40 minutes at a temperature below 40° C., and grind it at 1200 rpm to 1500 rpm to a fineness of less than 20 μm at a temperature below 40° C.; add a silane coupling agent and an anti-crater agent, stir and mix at 400 rpm to 500 rpm for 10 to 15 minutes; add an organosilicon defoamer and a non-silicon defoaming agent, stir and mix at 400 rpm to 500 rpm for 10 to 15 minutes; filter through a 100-mesh to 150-mesh filter.

6. The method for preparing a heavy-duty anti-corrosion coating industrial coating according to claim 4, characterized in that: Add A504 catalyst, modified alicyclic amine epoxy resin curing agent, and HDI trimer curing agent to S2, stir and mix at 500 rpm to 600 rpm for 30 min to 40 min; and filter through a 100-150 mesh filter.

7. The method for preparing a heavy-duty anti-corrosion coating industrial coating according to claim 4, characterized in that: Add Dyhard UR 500 curing agent to S3 and grind at 1200-1500 rpm to a fineness of less than 15 μm.

8. The method for preparing a heavy-duty anti-corrosion coating industrial coating according to claim 4, characterized in that: In S4, component A, component B1 and component B2 are stirred and mixed at 600 rpm to 800 rpm for 5 to 8 minutes, and allowed to stand and mature for 10 to 15 minutes to obtain a coating.

9. The method for preparing a heavy-duty anti-corrosion coating industrial coating according to claim 4, characterized in that: Before use, component A, component B1 and component B2 should be sealed and stored separately in the dark.

Images