A low-corrosion snow-melting and ice-melting coating and its preparation method

Abstract

The present application relates to the technical field of epoxy resin coatings, and specifically discloses a low-corrosive snow-melting and ice-melting coating and a preparation method. The low-corrosive snow-melting and ice-melting coating comprises a component A, a component B and a component C in a mass ratio of 100: (40-50): (90-100), wherein the component A comprises the following raw materials: 100 parts of epoxy resin, 15-25 parts of polyurethane elastomer, 2-5 parts of epoxy reactive diluent, 0.5-1 part of defoamer, 2-5 parts of silane coupling agent, and 30-50 parts of microcapsule snow-melting agent; the component B comprises the following raw materials: 40-60 parts of polyamide curing agent, 5-10 parts of phytic acid, and the component C comprises reinforcing filler; the microcapsule snow-melting agent comprises a core material and a polyurethane wall material for wrapping the core material, and the core material comprises potassium acetate and sodium molybdate in a mass ratio of 100: (2-4). The present application can improve the sustained-release effect of the snow-melting agent in the snow-melting and ice-melting coating, and the coating has excellent low-corrosiveness and crack resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of epoxy resin coatings, and in particular to a low-corrosive snow-melting and ice-melting coating and a preparation method thereof. Background Art

[0002] In cold regions or during winter snowfall, roads, bridges, airport runways, and other infrastructure are prone to snow and ice accumulation, seriously impacting traffic safety and operational efficiency. Traditional methods for melting snow and ice include mechanical removal, spreading chemical de-icing agents (such as sodium chloride and calcium chloride), and electric heating.

[0003] Related art discloses a road surface de-icing coating and its preparation method. The coating is obtained by mixing components A, B, and C, spraying or coating them onto the road surface, and curing them. The mass ratio of components A, B, and C is 100:20-60:70-150. Component A consists of an epoxy resin, an elastic modifier, an epoxy reactive diluent, a de-icing agent, a defoaming agent, and a silane coupling agent; component B consists of an epoxy curing agent, a curing accelerator, a coupling agent, and a pigment; and component C consists of quartz powder, magnetite powder, and whiskers. The coating achieves efficient de-icing through the synergistic effect of a de-icing agent and microwave radiation heating. The de-icing agent is an organic de-icing agent primarily composed of potassium acetate.

[0004] While the aforementioned deicing coatings utilize an organic deicing agent primarily composed of potassium acetate, which can reduce the corrosion of chloride ions from chloride-based deicing agents on pavement or steel, directly incorporating the deicing agent into the coating can result in rapid initial release, resulting in a short-lived snow-melting effect. Therefore, it is necessary to improve the sustained-release properties of the deicing agent in low-corrosion deicing coatings. Summary of the Invention

[0005] In order to improve the slow-release performance of the deicing agent in the low-corrosion deicing coating, the present application provides a low-corrosion deicing coating and a preparation method.

[0006] In a first aspect, the present application provides a low-corrosion snow-melting and ice-melting coating, which adopts the following technical solutions:

[0007] A low-corrosive snow-melting and ice-melting coating comprises a component A, a component B, and a component C in a mass ratio of 100:(40-50):(90-100). Component A comprises the following raw materials in parts by weight, based on the total weight of component A: 100 parts of epoxy resin, 15-25 parts of polyurethane elastomer, 2-5 parts of epoxy reactive diluent, 0.5-1 part of defoaming agent, 2-5 parts of silane coupling agent, and 30-50 parts of microcapsule snow-melting agent. Component B comprises the following raw materials in parts by weight, based on the total weight of component B: 40-60 parts of polyamide curing agent and 5-10 parts of phytic acid. Component C comprises a reinforcing filler. The microcapsule snow-melting agent comprises a core material and a polyurethane wall material wrapping the core material. The core material comprises potassium acetate and sodium molybdate in a mass ratio of 100:(2-4).

[0008] By adopting the above technical solution, the flexible chain segments of the polyurethane elastomer and the rigid network of the epoxy resin form an interpenetrating structure, which enables the coating to maintain a large elongation at break and avoid cracking during freeze-thaw cycles. The surface of the microcapsule de-icing agent is modified by a silane coupling agent and connected to the epoxy resin through Si-O bonds, thereby improving the microcapsule-matrix interface strength and preventing it from falling off due to rolling. Potassium acetate is a low-corrosive and environmentally friendly de-icing agent that does not contain chloride ions. Sodium molybdate and potassium acetate form a complex salt in the core material. MoO4 released by sodium molybdate 2- With potassium acetate K + Calcium molybdate precipitates form, covering the concrete pores and inhibiting penetration. At the same time, molybdate ions passivate the metal surface, reducing corrosion. The micropores of the polyurethane wall material allow a small amount of water to penetrate, triggering the dissolution of potassium acetate, which can quickly start ice melting in the early stages. After the wall material swells, the pores shrink, and the subsequent release rate decreases, thereby achieving a sustained-release effect. Moreover, the wall material blocks potassium acetate from directly contacting the road surface, reducing the chemical attack of the active ions on the concrete. The polyamide curing agent imparts moderate flexibility and density to the coating, reducing the generation of microcracks. At the same time, its amino group reacts with the phosphate group of phytic acid, enhancing the stability of the microcapsule de-icing agent in the coating and further improving the sustained-release effect of the microcapsule de-icing agent. The reinforcing filler improves the wear resistance of the coating and protects the integrity of the microcapsule structure. Therefore, through the synergistic combination of the above-mentioned components, the present application can improve the sustained-release effect of the de-icing agent in the de-icing coating, allowing the de-icing coating to achieve a long-term de-icing effect. Moreover, the coating has excellent low-corrosion and crack resistance.

[0009] In a specific embodiment, the B component further includes polyacrylic acid and polyethyleneimine.

[0010] By employing this technical solution, polyacrylic acid, which contains carboxylic acid groups, and polyethyleneimine, which contains amino groups, form pH-sensitive microspheres through electrostatic interaction. During low-temperature freezing, the carboxylic acid groups protonate, causing the polyacrylic acid and polyethyleneimine to swell, accelerating the release of the core material. During drying at room temperature, the carboxylic acid deprotonates, causing the polyacrylic acid and polyethyleneimine to shrink, inhibiting the ineffective release of the deicing agent. This allows for controlled deicing agent release and extends the ice-melting cycle.

[0011] In a specific embodiment, the B component further includes silicon carbide whiskers.

[0012] By employing this technical solution, the SiO2 oxide layer on the SiC whisker surface forms hydrogen bonds with the amino groups of the polyamide curing agent, enhancing interfacial adhesion and improving the coating's peel strength. The SiC whiskers adsorb phytic acid molecules, forming a SiC-phytic acid composite passivation film on the metal surface, reducing corrosion to the steel bars. Furthermore, the whiskers' high modulus inhibits the growth of microcracks in the coating during low-temperature freeze-thaw cycles, reducing the penetration path for corrosive media and inhibiting their penetration.

[0013] In a specific embodiment, the B component further includes zeolite powder.

[0014] By adopting the above technical solution, the high specific surface area and microporous structure of zeolite powder can adsorb the uncoated potassium acetate or residual chloride salt in component A, forming a fast-slow two-phase release system with the microcapsule. Zeolite absorbs more water under low temperature and high humidity conditions, promoting the release of snow melting agent; it adsorbs and stores water under high temperature and dry conditions, reducing ineffective loss. In addition, phytic acid or sodium molybdate is loaded in the zeolite pores, and the release is triggered by pH or humidity changes, forming a gradient protection with the free corrosion inhibitor in component B. Al released by zeolite 3+ Reacts with phytic acid to form Al - Phytic acid complex fills micro-cracks in concrete and reduces the penetration of corrosive media.

[0015] In a specific embodiment, the reinforcing filler includes at least one of quartz powder, hydroxyapatite or mesoporous silica.

[0016] By employing this technical solution, quartz powder significantly improves the coating's compressive strength and wear resistance. It does not react with deicing agents or sodium molybdate, preventing byproduct formation and maintaining coating stability. It also synergizes with silicon carbide whiskers to enhance crack resistance. Hydroxyapatite is a biocompatible material with no ecotoxicity, making it suitable for sensitive areas. It also neutralizes acidic byproducts produced during snowmelt, reducing concrete carbonization and steel corrosion. Mesoporous silica can adsorb and slowly release potassium acetate, forming a dual-stage release system with the microcapsules, extending the snowmelt cycle.

[0017] In a specific embodiment, the epoxy reactive diluent is any one of neopentyl glycol diglycidyl ether phosphate, polypropylene glycol diglycidyl ether or glycidyl acrylate.

[0018] By employing this technical solution, the phosphate groups of neopentyl glycol diglycidyl ether phosphate bond with the silane coupling agent via hydrogen bonds, improving the interfacial adhesion between the microcapsules and the resin matrix. The polyether backbone of polypropylene glycol diglycidyl ether imparts high flexibility to the coating, enhancing its resistance to freeze-thaw cracking. The acrylic acid double bonds of glycidyl acrylate participate in the free radical curing reaction, synergizing with the epoxy groups to form a dense cross-linked network, helping to reduce coating porosity and mitigate the penetration of corrosive media.

[0019] In a second aspect, the present application provides a method for preparing a low-corrosive snow-melting and ice-melting coating, which adopts the following technical solution:

[0020] A method for preparing a low-corrosive snow-melting and ice-melting coating comprises the following steps:

[0021] Mix epoxy resin, polyurethane elastomer, and epoxy reactive diluent, heat to 60-65°C, stir evenly, add silane coupling agent, microcapsule snow melting agent, and defoaming agent, stir evenly to obtain component A;

[0022] The polyamide curing agent and phytic acid are mixed and ball-milled to obtain component B;

[0023] Component A and component B are mixed in a weight ratio of component A: component B: component C = 100: (40-50): (90-100), and then sprayed onto the road surface with component C using a two-component spray gun.

[0024] By employing the above technical solution, heating to 60-65°C reduces the epoxy resin's viscosity, promotes the formation of an interpenetrating network with the polyurethane elastomer, and enhances the coating's low-temperature toughness. Ball milling helps evenly disperse the phytic acid in the polyamide curing agent, preventing localized agglomeration. Preparing components A and B helps completely crosslink the epoxy resin and polyamide curing agent. Spraying with a two-component spray gun allows for dynamic mixing of the components within the spray gun, preventing pre-mixing and gelling, ensuring smooth application.

[0025] In a specific embodiment, the microcapsule snow-melting agent is prepared according to the following steps:

[0026] Weigh the following raw materials in parts by weight: 10-20 parts of diisocyanate, 6-14 parts of polyether polyol, 3-8 parts of ethylenediamine, 280-380 parts of deionized water, 150-250 parts of cyclohexane, 3-8 parts of sodium lauryl sulfate, 2-5 parts of sodium molybdate, and 100 parts of potassium acetate;

[0027] Add potassium acetate and sodium molybdate to deionized water, heat to 60-65°C, and stir evenly to obtain a core material solution;

[0028] Sodium lauryl sulfate is added to the core material solution, and shearing and emulsifying are performed uniformly to obtain an aqueous phase emulsion;

[0029] Mix cyclohexane, diisocyanate and polyether polyol, heat to 40-50°C, and stir evenly to obtain a prepolymer solution;

[0030] The aqueous emulsion is added dropwise to the oil phase, stirred evenly, heated to 70-75°C, ethylenediamine is added, kept warm for 4-5 hours, centrifuged, the supernatant is removed, washed, and vacuum dried to obtain a microcapsule snow-melting agent.

[0031] By employing this technical solution, sodium lauryl sulfate reduces the water-oil interfacial tension, forming a uniformly sized W / O emulsion. This ensures that the core material is completely encapsulated by the oil phase, helping to improve the microcapsule encapsulation effect. Diisocyanate and polyether polyol are cross-linked with ethylenediamine to form a polyurethane wall material, thus enabling the preparation of a microcapsule de-icing agent.

[0032] In summary, this application has the following beneficial effects:

[0033] 1. The present application can improve the slow-release effect of the deicing agent in the deicing coating through the synergistic combination of the above components, so that the deicing coating can exert the deicing effect for a long time. Moreover, the coating has excellent low corrosion and anti-cracking properties.

[0034] 2. In this application, polyacrylic acid and polyethyleneimine are preferably used to control the release of snow-melting agents and extend the ice-melting period.

[0035] 3. The method of the present application can reduce the viscosity of the epoxy resin, promote the formation of an interpenetrating network with the polyurethane elastomer, and enhance the low-temperature toughness of the coating. DETAILED DESCRIPTION

[0036] The present application is further described in detail below with reference to the following examples and comparative examples.

[0037] Example

[0038] Example 1

[0039] This embodiment provides a low-corrosion snow-melting and ice-melting coating, including component A, component B, and component C in a mass ratio of 100:45:95.

[0040] Component A includes the following raw materials: 100kg of epoxy resin (E-51), 20kg of polyurethane elastomer (brand B80A), 3.5kg of neopentyl glycol diglycidyl ether phosphate, 1kg of defoamer (BYK-066N), 3.5kg of silane coupling agent (KH-550), and 40kg of microcapsule deicing agent. The microcapsule deicing agent consists of a core material and a polyurethane shell material surrounding the core material. The core material is composed of potassium acetate and sodium molybdate in a mass ratio of 100:3.

[0041] The microcapsule snow-melting agent of this embodiment is prepared according to the following steps:

[0042] The following raw materials were weighed: 15 kg of diisocyanate, 10 kg of polyether polyol, 5 kg of ethylenediamine, 330 kg of deionized water, 200 kg of cyclohexane, 5 kg of sodium lauryl sulfate, 4 kg of sodium molybdate, and 100 parts of potassium acetate.

[0043] Potassium acetate and sodium molybdate were added into deionized water, heated to 63° C., and stirred evenly to obtain a core material solution.

[0044] Sodium lauryl sulfate is added to the core material solution, and the solution is sheared and emulsified to obtain an aqueous phase emulsion.

[0045] Cyclohexane, diisocyanate and polyether polyol are mixed, heated to 45° C., and stirred evenly to obtain a prepolymer solution.

[0046] The aqueous emulsion was gradually added dropwise to the oil phase, stirred evenly, and then heated to 73°C. Ethylenediamine was added and kept warm for 4.5 hours. The mixture was centrifuged, the supernatant was removed, washed, and vacuum dried to obtain a microcapsule snow-melting agent.

[0047] Component B includes the following raw materials: 50 kg of polyamide curing agent (model 651) and 7.5 kg of phytic acid.

[0048] Component C includes quartz powder (100-200 mesh).

[0049] This embodiment also provides a method for preparing a low-corrosive snow-melting and ice-melting coating, comprising the following steps:

[0050] According to the proportion, epoxy resin, polyurethane elastomer and epoxy reactive diluent are mixed, heated to 60°C, stirred evenly, and then silane coupling agent, microcapsule snow melting agent and defoaming agent are added, stirred evenly to obtain component A.

[0051] The polyamide curing agent and phytic acid were mixed and ball-milled for 2 hours to obtain component B.

[0052] Component A and component B are mixed in a weight ratio of component A: component B: component C = 100:45:95, and then sprayed onto the road surface with component C using a two-component spray gun.

[0053] Example 2

[0054] This embodiment differs from Example 1 only in that the low-corrosion snow-melting and ice-deicing coating comprises components A, B, and C in a weight ratio of 100:40:90. In the method for preparing the low-corrosion snow-melting and ice-deicing coating, components A and B are mixed in a weight ratio of 100:40:90, and then sprayed onto the road surface with component C using a two-component spray gun.

[0055] Example 3

[0056] This embodiment differs from Example 1 only in that the low-corrosion snow-melting and ice-deicing coating comprises components A, B, and C in a mass ratio of 100:50:100. In the method for preparing the low-corrosion snow-melting and ice-deicing coating, components A and B are mixed in a weight ratio of 100:50:100, and then sprayed onto the road surface with component C using a two-component spray gun.

[0057] Example 4

[0058] The only difference between this embodiment and Example 1 is that component A includes the following raw materials: 100 kg of epoxy resin (E-51), 15 kg of polyurethane elastomer (brand B80A), 5 kg of neopentyl glycol diglycidyl ether phosphate, 0.5 kg of defoaming agent (BYK-066N), 5 kg of silane coupling agent (KH-550), and 50 kg of microcapsule snow-melting agent.

[0059] Example 5

[0060] The only difference between this embodiment and Example 1 is that component A includes the following raw materials: 100 kg of epoxy resin (E-51), 25 kg of polyurethane elastomer (brand B80A), 2 kg of neopentyl glycol diglycidyl ether phosphate, 1 kg of defoaming agent (BYK-066N), 2 kg of silane coupling agent (KH-550), and 30 kg of microcapsule snow-melting agent.

[0061] Example 6

[0062] The only difference between this embodiment and embodiment 1 is that the core material includes potassium acetate and sodium molybdate in a mass ratio of 100:2.

[0063] Example 7

[0064] The only difference between this embodiment and embodiment 1 is that the core material includes potassium acetate and sodium molybdate in a mass ratio of 100:4.

[0065] Example 8

[0066] The only difference between this embodiment and embodiment 1 is that component B includes the following raw materials: 40 kg of polyamide curing agent (model 651) and 10 kg of phytic acid.

[0067] Example 9

[0068] The only difference between this embodiment and embodiment 1 is that component B includes the following raw materials: 60 kg of polyamide curing agent (model 651) and 5 kg of phytic acid.

[0069] Example 10

[0070] The only difference between this embodiment and embodiment 1 is that quartz powder (100-200 mesh) is replaced by an equal amount of hydroxyapatite (100-200 mesh).

[0071] Example 11

[0072] The only difference between this embodiment and embodiment 1 is that the quartz powder (100-200 mesh) is replaced by an equal amount of mesoporous silica (100-200 mesh).

[0073] Example 12

[0074] This example differs from Example 1 only in that Component B comprises the following raw materials: 50 kg of a polyamide curing agent (Type 651), 7.5 kg of phytic acid, 2 kg of polyacrylic acid, and 2 kg of polyethyleneimine. In the preparation method for a low-corrosive snow-melting and ice-deicing coating, the polyamide curing agent, phytic acid, polyacrylic acid, and polyethyleneimine are mixed and ball-milled for 2 hours to obtain Component B.

[0075] Example 13

[0076] This example differs from Example 1 only in that Component B includes the following raw materials: 50 kg of polyamide curing agent (Type 651), 7.5 kg of phytic acid, and 4 kg of silicon carbide whiskers. In the method for preparing a low-corrosive snow-melting and ice-melting coating, the polyamide curing agent, phytic acid, and silicon carbide whiskers are mixed and ball-milled for 2 hours to obtain Component B.

[0077] Example 14

[0078] This example differs from Example 1 only in that Component B includes the following raw materials: 50 kg of polyamide curing agent (Type 651), 7.5 kg of phytic acid, and 4 kg of zeolite powder. In the preparation method for a low-corrosive snow-melting and ice-deicing coating, the polyamide curing agent, phytic acid, and zeolite powder are mixed and ball-milled for 2 hours to obtain Component B.

[0079] Example 15

[0080] This example differs from Example 1 only in that Component B comprises the following raw materials: 50 kg of polyamide curing agent (Type 651), 7.5 kg of phytic acid, 2 kg of polyacrylic acid, 2 kg of polyethyleneimine, and 4 kg of silicon carbide whiskers. In the method for preparing a low-corrosive snow-melting and ice-melting coating, the polyamide curing agent, phytic acid, polyacrylic acid, polyethyleneimine, silicon carbide whiskers, and zeolite powder are mixed and ball-milled for 2 hours to obtain Component B.

[0081] Example 16

[0082] This example differs from Example 1 only in that Component B comprises the following raw materials: 50 kg of polyamide curing agent (Type 651), 7.5 kg of phytic acid, 2 kg of polyacrylic acid, 2 kg of polyethyleneimine, 4 kg of silicon carbide whiskers, and 4 kg of zeolite powder. In the preparation method for a low-corrosive snow-melting and ice-deicing coating, the polyamide curing agent, phytic acid, polyacrylic acid, polyethyleneimine, silicon carbide whiskers, and zeolite powder are mixed and ball-milled for 2 hours to obtain Component B.

[0083] Example 17

[0084] The only difference between this embodiment and embodiment 1 is that the microcapsule snow melting agent of this embodiment is prepared according to the following steps:

[0085] The following raw materials were weighed: 10 kg of diisocyanate, 14 kg of polyether polyol, 8 kg of ethylenediamine, 380 kg of deionized water, 250 kg of cyclohexane, 8 kg of sodium lauryl sulfate, 5 kg of sodium molybdate, and 100 parts of potassium acetate.

[0086] Potassium acetate and sodium molybdate were added into deionized water, heated to 60° C., and stirred to obtain a core material solution.

[0087] Sodium lauryl sulfate is added to the core material solution, and the solution is sheared and emulsified to obtain an aqueous phase emulsion.

[0088] Cyclohexane, diisocyanate and polyether polyol are mixed, heated to 40° C., and stirred evenly to obtain a prepolymer solution.

[0089] The aqueous emulsion was gradually added dropwise to the oil phase, stirred evenly, and then heated to 70°C. Ethylenediamine was added and kept warm for 5 hours. The mixture was centrifuged, the supernatant was removed, washed, and vacuum dried to obtain a microcapsule snow-melting agent.

[0090] Example 18

[0091] The only difference between this embodiment and embodiment 1 is that the microcapsule snow melting agent of this embodiment is prepared according to the following steps:

[0092] The following raw materials were weighed: 20 kg of diisocyanate, 6 kg of polyether polyol, 3 kg of ethylenediamine, 280 kg of deionized water, 150 kg of cyclohexane, 3 kg of sodium lauryl sulfate, 2 kg of sodium molybdate, and 100 parts of potassium acetate.

[0093] Potassium acetate and sodium molybdate were added into deionized water, heated to 65° C., and stirred evenly to obtain a core material solution.

[0094] Sodium lauryl sulfate is added to the core material solution, and the solution is sheared and emulsified to obtain an aqueous phase emulsion.

[0095] Cyclohexane, diisocyanate and polyether polyol are mixed, heated to 45° C., and stirred evenly to obtain a prepolymer solution.

[0096] The aqueous emulsion was gradually added dropwise to the oil phase, stirred evenly, and then heated to 75°C. Ethylenediamine was added and kept warm for 4 hours. The mixture was centrifuged, the supernatant was removed, washed, and vacuum dried to obtain a microcapsule snow-melting agent.

[0097] Example 19

[0098] The only difference between this embodiment and Example 1 is that in the preparation method of the low-corrosive snow-melting and ice-melting coating: the epoxy resin, polyurethane elastomer, and epoxy reactive diluent are mixed according to the ratio, heated to 65°C, and stirred evenly, and then the silane coupling agent, microcapsule snow-melting agent and defoaming agent are added, and stirred evenly to obtain component A.

[0099] Comparative Example

[0100] Comparative Example 1

[0101] The only difference between this comparative example and Example 1 is that in component A, an equal amount of potassium acetate is used to replace the microcapsule snow-melting agent.

[0102] Comparative Example 2

[0103] The only difference between this comparative example and Example 1 is that in component B, an equal amount of polyamide curing agent (type 651) is used to replace phytic acid.

[0104] Comparative Example 3

[0105] The only difference between this comparative example and Example 1 is that the C component is not included.

[0106] Performance testing

[0107] The following performance tests were conducted on the low-corrosion snow-melting and ice-melting coatings prepared in Examples 1-19 and Comparative Examples 1-3:

[0108] Coating release rate test of potassium acetate: The low-corrosion snow-melting and ice-melting coating was sprayed onto the surface of a concrete specimen (150×150×15mm) with a coating thickness of 0.8±0.1mm. After curing, the coated concrete specimen was completely immersed in 10L of deionized water. On the 3rd and 7th days of immersion, samples were taken to determine the potassium acetate concentration (mol / L). The potassium acetate release rate on the 3rd and 7th days of immersion was then calculated based on the formula: potassium acetate release rate = (potassium acetate concentration × deionized water volume) × relative molecular mass of potassium acetate ÷ total amount of potassium acetate in the coating × 100%.

[0109] Snow and ice melting test: Prepare an ice layer with a thickness of 5±0.5mm in a constant temperature and humidity chamber at -20℃±2℃ and humidity ≥90%. Spray the low-corrosion snow and ice melting coating onto the surface of a concrete specimen (150×150×15mm) with a coating thickness of 0.8±0.1mm. After curing, place it on the ice layer. Simulated irradiance 1000W / m 2 When the ice layer is completely melted by sunlight, the ice melting rate (mm / h) is calculated according to the principle of ice melting rate = ice thickness ÷ ice complete melting time.

[0110] The low-corrosion snow-melting and ice-deicing coating was sprayed onto the surface of a concrete specimen (100×100×10mm) with a coating thickness of 0.5±0.1mm. After curing for 7 days, the crack area ratio of the low-corrosion snow-melting and ice-deicing coating was tested according to GB / T 9268-2008.

[0111] The test results are shown in Table 1.

[0112] Table 1

[0113]

[0114] Combining Example 1 and Comparative Examples 1-3 and Table 1, it can be seen that compared to Example 1, the potassium acetate release rate of Comparative Example 1 increased on the 3rd day, reached 100% on the 7th day, the ice melting rate increased, and the cracked area accounted for a significantly larger proportion. The potassium acetate release rate of Comparative Example 2 decreased on the 3rd day, and was >60% on the 7th day, the ice melting rate decreased, and the cracked area accounted for a larger proportion. The potassium acetate release rate of Comparative Example 3 increased slightly on the 3rd day, reached 60% on the 7th day, and the cracked area accounted for a significantly increased proportion. Under the raw material ratio and preparation method of Example 1, the potassium acetate release rate reached more than 35% in the first 3 days of snow and ice melting, and was less than 60% on the 7th day of snow and ice melting. Moreover, the ice melting rate reached more than 2.5 mm / h, and the cracked area accounted for less than 2%. This shows that the raw material ratio and preparation method of Example 1 are helpful to improve the sustained release effect of potassium acetate in the coating, and the coating has excellent snow and ice melting rate and crack resistance.

[0115] Combining Examples 1-19 with Table 1, it can be seen that the potassium acetate release rate of Examples 1-19 was above 35% on day 3, and less than 60% on day 7. Furthermore, the ice melting rate reached above 2.5 mm / h, and the cracked area accounted for less than 2%. This demonstrates that within the range of the raw material ratios and preparation methods of Examples 1-19, the sustained release of potassium acetate from the coating was improved, and the coating exhibited excellent snow and ice melting rates and crack resistance.

[0116] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A low-corrosion snow-melting and ice-melting coating, characterized in that: The invention comprises component A, component B and component C in a mass ratio of 100:(40-50):(90-100), wherein component A comprises the following raw materials in parts by weight based on the total weight of component A: 100 parts of epoxy resin, 15-25 parts of polyurethane elastomer, 2-5 parts of epoxy reactive diluent, 0.5-1 part of defoaming agent, 2-5 parts of silane coupling agent, and 30-50 parts of microcapsule snow-melting agent; and, based on the total weight of component B, component B comprises the following raw materials in parts by weight: 40-60 parts of polyamide curing agent and 5-10 parts of phytic acid; component C comprises reinforcing filler; the microcapsule snow-melting agent comprises a core material and a polyurethane wall material wrapping the core material, and the core material comprises potassium acetate and sodium molybdate in a mass ratio of 100:(2-4); The microcapsule snow-melting agent is prepared according to the following steps: Weigh the following raw materials in parts by weight: 10-20 parts of diisocyanate, 6-14 parts of polyether polyol, 3-8 parts of ethylenediamine, 280-380 parts of deionized water, 150-250 parts of cyclohexane, 3-8 parts of sodium lauryl sulfate, 2-5 parts of sodium molybdate, and 100 parts of potassium acetate; Add potassium acetate and sodium molybdate to deionized water, heat to 60-65°C, and stir evenly to obtain a core material solution; Sodium lauryl sulfate is added to the core material solution, and shearing and emulsifying are performed uniformly to obtain an aqueous phase emulsion; Mix cyclohexane, diisocyanate and polyether polyol, heat to 40-50°C, and stir evenly to obtain a prepolymer solution; The aqueous emulsion is added dropwise to the oil phase, stirred evenly, heated to 70-75°C, ethylenediamine is added, kept warm for 4-5 hours, centrifuged, the supernatant is removed, washed, and vacuum dried to obtain a microcapsule snow-melting agent.

2. The low-corrosion snow-melting and ice-melting coating according to claim 1, characterized in that: The B component further comprises polyacrylic acid and polyethyleneimine.

3. The low-corrosion snow-melting and ice-melting coating according to claim 2, characterized in that: The B component also includes silicon carbide whiskers.

4. The low-corrosion snow-melting and ice-melting coating according to claim 3, characterized in that: The B component further includes zeolite powder.

5. The low-corrosion snow-melting and ice-melting coating according to claim 1, characterized in that: The reinforcing filler includes at least one of quartz powder, hydroxyapatite or mesoporous silica.

6. The low-corrosion snow-melting and ice-melting coating according to claim 1, characterized in that: The epoxy reactive diluent is any one of neopentyl glycol diglycidyl ether phosphate, polypropylene glycol diglycidyl ether or glycidyl acrylate.

7. A method for preparing a low-corrosion snow-melting and ice-melting coating according to any one of claims 1 to 6, characterized in that: The steps include: Mix epoxy resin, polyurethane elastomer, and epoxy reactive diluent, heat to 60-65°C, stir evenly, add silane coupling agent, microcapsule snow melting agent, and defoaming agent, stir evenly to obtain component A; The polyamide curing agent and phytic acid are mixed and ball-milled to obtain component B; Component A and component B are mixed in a weight ratio of component A: component B: component C = 100: (40-50): (90-100), and then sprayed onto the road surface with component C using a two-component spray gun.

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