High-performance water-based environment-friendly anticorrosive paint and preparation method thereof

Abstract

The invention discloses a high-performance water-based environment-friendly anticorrosive coating and a preparation method thereof, and belongs to the technical field of coatings. Comprising the following raw materials: water-borne epoxy resin E-44, modified polysulfide rubber, a functional silane coupling agent, water-borne acrylic resin, 200-mesh glass flakes and wollastonite powder. Coating the heavy calcium powder with zinc phosphate and nano silicon dioxide; a silane coupling agent, microencapsulated castor oil and a plant antibacterial extracting solution are added; the cleaning agent is prepared from an isothiazolinone derivative, a benzimidazole preservative and sodium polyphosphate. The acid-rain-corrosion-resistant antibacterial coating is excellent in acid resistance, weather resistance, scouring resistance, construction convenience and the like, meanwhile, by optimizing the formula and selecting the raw materials, the cost is effectively reduced on the premise that the performance is guaranteed, and the acid-rain-corrosion-resistant antibacterial coating is suitable for industrial building outer walls, smelting enterprises, chemical equipment and other scenes needing long-term acid rain corrosion resistance and antibacterial protection.

Description

Technical Field

[0001] This invention relates to the field of coating technology, specifically to a high-performance water-based environmentally friendly anti-corrosion coating and its preparation method. Background Technology

[0002] With increasingly stringent environmental protection requirements, water-based coatings have gained widespread attention due to their low VOC emissions. However, existing water-based coatings still have shortcomings in terms of corrosion resistance, adhesion, and antibacterial properties, making it difficult to meet the requirements for use in harsh environments. Particularly in smelting and chemical environments, the corrosion problems of acidic gases (such as sulfur dioxide and nitrogen oxides) and acid rain on building exteriors and equipment are particularly severe. Furthermore, traditional anti-corrosion coatings generally suffer from insufficient acid resistance, weak antibacterial properties, complex application processes, and high costs.

[0003] Therefore, developing a low-cost, highly corrosion-resistant, environmentally friendly, multi-functional anti-corrosion coating that also possesses excellent acid resistance, antibacterial properties, adhesion, and ease of application is of significant practical importance. Summary of the Invention

[0004] The purpose of this invention is to provide a high-performance water-based environmentally friendly anti-corrosion coating and its preparation method. This coating exhibits excellent performance in terms of acid resistance, weather resistance, erosion resistance, and ease of application. At the same time, by optimizing the formula and raw material selection, the cost is effectively reduced while ensuring performance. It is suitable for industrial building exterior walls, smelting enterprises, chemical equipment, and other scenarios that require long-term resistance to acid rain corrosion and antibacterial protection, thereby solving the problems mentioned in the background art.

[0005] The technical solution adopted in this invention is as follows:

[0006] A high-performance water-based environmentally friendly anti-corrosion coating, comprising the following raw materials by weight percentage:

[0007] Base material: 35%–45% waterborne epoxy resin E-44, 10%–20% modified polysulfide rubber, 4%–6% functional silane coupling agent, and 15%–25% waterborne acrylic resin;

[0008] Gradient filler: 5%–8% 200-mesh glass flakes, 12%–15% wollastonite powder; 5%–8% zinc phosphate, 3%–5% nano-silica coated heavy calcium carbonate powder;

[0009] Self-healing hydrophobic additives: 1%–2% silane coupling agent, 0.5%–1% microencapsulated castor oil, and 0.5%–1% plant antibacterial extract;

[0010] Acid-resistant preservatives: 1%–2% isothiazolinone derivatives, 0.5%–1% benzimidazole preservatives, and 1%–2% sodium polyphosphate.

[0011] The preparation method of the high-performance water-based environmentally friendly anti-corrosion coating includes the following steps:

[0012] S1. Raw material pretreatment: Remove impurities from waterborne epoxy resin, modified polysulfide rubber and waterborne acrylic resin respectively; pretreat glass flakes, wollastonite powder and zinc phosphate to ensure dispersibility;

[0013] S2. Mixing process: Add water-based epoxy resin and modified polysulfide rubber to a mixing container and stir at medium speed for 10 minutes; add functional silane coupling agent, increase the stirring speed to 600 rpm, and stir for 5 minutes; add glass flakes, wollastonite powder, and zinc phosphate in sequence, stirring for 3 minutes after each batch; add nano-SiO2-coated heavy calcium carbonate powder and continue stirring until uniformly dispersed; finally, add silane coupling agent, microencapsulated castor oil, plant antibacterial extract, and acid-resistant preservative, and stir for 10 minutes;

[0014] S3. Filtration and storage: Filter the mixed coating from step S2 through a 300-mesh filter to remove impurities; transfer it to a clean and dry PE or stainless steel container, seal it, and store it in an environment with a temperature of 15-30°C and a humidity of no more than 70%.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0016] 1. This invention is low-cost and environmentally friendly: it uses a water-based system with a VOC content as low as 35g / L, meeting environmental protection requirements. Material procurement is simple, with the main components being common commercially available chemical raw materials.

[0017] 2. Multifunctionality of the Invention: This invention provides dual protection through the combination of acid-resistant preservatives and plant antibacterial extracts. The invention also significantly enhances the durability and resistance to secondary corrosion of the coating through a self-healing hydrophobic additive.

[0018] 3. Ease of Construction: This invention shortens the construction cycle and reduces energy consumption through a low-temperature rapid curing process. The gradient filler design ensures the adhesion and impermeability of the coating on complex surfaces.

[0019] 4. This invention significantly improves corrosion resistance and adhesion by combining a ternary composite resin system with a gradient filler structure. This invention also provides environmentally friendly self-healing functionality through the combination of microencapsulation technology and plant-based antibacterial components. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with specific data from the embodiments of the present invention. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0021] Therefore, the following detailed description of embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] Example 1

[0023] This embodiment provides a high-performance water-based environmentally friendly anti-corrosion coating for the protection of exterior walls of industrial buildings. The raw material ratio (weight percentage) of the coating is shown in the table below:

[0024]

[0025]

[0026] The preparation method of the high-performance water-based environmentally friendly anti-corrosion coating includes the following steps:

[0027] (1) Raw material pretreatment:

[0028] Impurities were removed from the waterborne epoxy resin, modified polysulfide rubber, and waterborne acrylic resin respectively.

[0029] Pretreatment of glass flakes, wollastonite powder, and zinc phosphate ensures dispersibility.

[0030] (2) Mixing process:

[0031] Add waterborne epoxy resin and modified polysulfide rubber to a mixing container and stir at medium speed for 10 minutes.

[0032] Add the functional silane coupling agent, increase the stirring speed to 600 rpm, and stir for 5 minutes.

[0033] Add glass flakes, wollastonite powder, and zinc phosphate in sequence, stirring for 3 minutes after each batch.

[0034] Add nano-SiO2-coated heavy calcium carbonate powder and continue stirring until evenly dispersed.

[0035] Finally, add the silane coupling agent, microencapsulated castor oil, plant antibacterial extract, and acid-resistant preservative, and stir for 10 minutes.

[0036] (3) Filtration and storage:

[0037] The mixed paint is filtered through a 300-mesh filter to remove impurities.

[0038] Transfer to a clean, dry PE or stainless steel container, seal and store in an environment with a temperature of 15-30°C and a humidity of no more than 70%.

[0039] The implementation effect of this embodiment:

[0040] Acid resistance: After immersion in 10% H2SO4 solution for 168 hours, the coating showed no blistering or peeling, which is significantly better than the slight blistering performance of conventional water-based epoxy coatings.

[0041] Adhesion: The adhesion test result was 6.2 MPa, which is much higher than the 4.5 MPa of the conventional system.

[0042] Antibacterial properties: It has an inhibition rate of 99.9% against Staphylococcus aureus, effectively preventing microbial contamination and biocorrosion.

[0043] VOC content: VOC content is as low as 35g / L, which meets environmental protection requirements.

[0044] Construction convenience: The low-temperature rapid curing process shortens the construction cycle, reduces energy consumption, and achieves an adhesion retention rate of over 95%.

[0045] Example 2

[0046] This embodiment provides a high-performance water-based environmentally friendly anti-corrosion coating for the corrosion protection of chemical equipment. The raw material ratio (weight percentage) of the coating is shown in the table below:

[0047]

[0048]

[0049] The preparation method of the high-performance water-based environmentally friendly anti-corrosion coating includes the following steps:

[0050] (1) Raw material pretreatment:

[0051] Impurities were removed from the waterborne epoxy resin, modified polysulfide rubber, and waterborne acrylic resin respectively.

[0052] Pretreatment of glass flakes, wollastonite powder, and zinc phosphate ensures dispersibility.

[0053] (2) Mixing process:

[0054] Add waterborne epoxy resin and modified polysulfide rubber to a mixing container and stir at medium speed for 10 minutes.

[0055] Add the functional silane coupling agent, increase the stirring speed to 600 rpm, and stir for 5 minutes.

[0056] Add glass flakes, wollastonite powder, and zinc phosphate in sequence, stirring for 3 minutes after each batch.

[0057] Add nano-SiO2-coated heavy calcium carbonate powder and continue stirring until evenly dispersed.

[0058] Finally, add the silane coupling agent, microencapsulated castor oil, plant antibacterial extract, and acid-resistant preservative, and stir for 10 minutes.

[0059] (3) Filtration and storage:

[0060] The mixed paint is filtered through a 300-mesh filter to remove impurities.

[0061] Transfer to a clean, dry PE or stainless steel container, seal and store in an environment with a temperature of 15-30°C and a humidity of no more than 70%.

[0062] This embodiment provides performance testing of coatings.

[0063] Acid resistance: After immersion in 10% H2SO4 solution for 168 hours, the coating showed no blistering or peeling, demonstrating excellent acid resistance.

[0064] Salt spray test: After 1200 hours of testing in a salt spray environment, the coating showed no rust, which is significantly better than the edge rust performance of the conventional system after 720 hours.

[0065] Abrasion resistance: Abrasion resistance test results showed a weight loss of 12mg (1kg / 500 rpm), which is much lower than the 28mg of the conventional system.

[0066] Antibacterial properties: The inhibition rate against Escherichia coli and Staphylococcus aureus reaches 99.9%, effectively preventing microbial corrosion.

[0067] VOC content: VOC content is as low as 35g / L, which meets environmental protection requirements.

[0068] Construction convenience: The low-temperature rapid curing process shortens the construction cycle, reduces energy consumption, and achieves an adhesion retention rate of over 95%.

[0069] This invention provides coatings that are low-cost and environmentally friendly:

[0070] It uses a water-based system with VOC content as low as 35g / L, meeting environmental protection requirements.

[0071] The materials are easy to source, and the main components are all common chemical raw materials available on the market.

[0072] This invention provides the multifunctionality of coatings:

[0073] The combination of acid-resistant preservatives and plant antibacterial extracts provides double protection.

[0074] Self-healing hydrophobic additives significantly improve the durability and resistance to secondary corrosion of coatings.

[0075] This invention provides ease of application for coatings:

[0076] The low-temperature rapid curing process shortens the construction cycle and reduces energy consumption.

[0077] The gradient filler design ensures the coating's adhesion and impermeability on complex surfaces.

[0078] The coating provided by this invention significantly improves corrosion resistance and adhesion by combining a ternary composite resin system with a gradient filler structure.

[0079] This coating provides an environmentally friendly self-healing function by combining microencapsulation technology with plant-based antibacterial ingredients.

[0080] The anti-corrosion coating described in this invention is applied to the walls of smelting plants, the outer walls of acidic storage tanks, and steel structures in humid areas. After minimal surface treatment, it is applied by spraying or roller coating. A single spray layer is 100-120 μm thick, with a total thickness of 200-240 μm. After application, preheat at 50°C for 10 minutes, followed by curing at room temperature for 24 hours.

Claims

1. A high-performance water-based environmentally friendly anti-corrosion coating, characterized in that, Includes the following raw materials by weight percentage: Base material: 35%–45% waterborne epoxy resin E-44, 10%–20% modified polysulfide rubber, 4%–6% functional silane coupling agent, and 15%–25% waterborne acrylic resin; Gradient filler: 5%–8% 200-mesh glass flakes, 12%–15% wollastonite powder; 5%–8% zinc phosphate, 3%–5% nano-silica coated heavy calcium carbonate powder; Self-healing hydrophobic additives: 1%–2% silane coupling agent, 0.5%–1% microencapsulated castor oil, and 0.5%–1% plant antibacterial extract; Acid-resistant preservatives: 1%–2% isothiazolinone derivatives, 0.5%–1% benzimidazole preservatives, and 1%–2% sodium polyphosphate.

2. The method for preparing a high-performance water-based environmentally friendly anti-corrosion coating according to claim 1, characterized in that, Includes the following steps: S1. Raw material pretreatment: Remove impurities from waterborne epoxy resin, modified polysulfide rubber and waterborne acrylic resin respectively; pretreat glass flakes, wollastonite powder and zinc phosphate to ensure dispersibility; S2. Mixing process: Add water-based epoxy resin and modified polysulfide rubber to a mixing container and stir at medium speed for 10 minutes; add functional silane coupling agent, increase the stirring speed to 600 rpm, and stir for 5 minutes; add glass flakes, wollastonite powder, and zinc phosphate in sequence, stirring for 3 minutes after each batch; add nano-SiO2-coated heavy calcium carbonate powder and continue stirring until uniformly dispersed; finally, add silane coupling agent, microencapsulated castor oil, plant antibacterial extract, and acid-resistant preservative, and stir for 10 minutes; S3. Filtration and storage: Filter the mixed coating from step S2 through a 300-mesh filter to remove impurities; transfer it to a clean and dry PE or stainless steel container, seal it, and store it in an environment with a temperature of 15-30°C and a humidity of no more than 70%.

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