Low-corrosion snow-melting and deicing coating and preparation method thereof

Abstract

The invention relates to the technical field of epoxy resin coatings, and particularly discloses a low-corrosion snow-melting and deicing coating and a preparation method thereof. The low-corrosion snow-melting and deicing coating comprises a component A, a component B and a component C in a mass ratio of 100: (40-50): (90-100), and the component A comprises the following raw materials: 100 parts of epoxy resin, 15-25 parts of a polyurethane elastomer, 2-5 parts of an epoxy reactive diluent, 0.5-1 part of a defoaming agent, 2-5 parts of a silane coupling agent and 30-50 parts of a microcapsule snow-melting agent; the component B comprises the following raw materials in parts by weight: 40-60 parts of a polyamide curing agent and 5-10 parts of phytic acid; the component C comprises a reinforcing filler; the microcapsule snow-melting agent comprises a core material and a polyurethane wall material wrapping the core material, wherein the core material comprises potassium acetate and sodium molybdate in a mass ratio of 100: (2-4). According to the invention, the slow release effect of the snow-melting agent in the snow-melting and deicing coating can be improved, and the coating has excellent low corrosion and cracking resistance.

Description

Technical Field

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

[0002] In cold regions or snowy environments in winter, the surfaces of infrastructure such as roads, bridges, and airport runways are prone to snow accumulation and icing, seriously affecting traffic safety and operation efficiency. Traditional snow-melting and ice-melting methods mainly include mechanical removal, spreading chemical snow-melting agents (such as sodium chloride, calcium chloride, etc.), and electrothermal ice-melting and other technologies.

[0003] In the related art, a road surface snow-melting and ice-melting coating and a preparation method thereof are disclosed. The road surface snow-melting and ice-melting coating is obtained by mixing three components A, B, and C, spraying or coating them on the road surface, and then curing. The mass ratio of the three components A, B, and C is 100:20 - 60:70 - 150. Component A is composed of epoxy resin, elastic modifier, epoxy active diluent, snow-melting agent, defoaming agent, and silane coupling agent; Component B is composed of epoxy curing agent, curing accelerator, coupling agent, and pigment; Component C is composed of quartz powder, magnet powder, and whiskers. The road surface snow-melting and ice-melting coating uses the synergistic effect of two methods, namely, the snow-melting agent and microwave radiation heating, to achieve efficient snow-melting and ice-melting. The snow-melting agent is an organic snow-melting agent mainly composed of potassium acetate.

[0004] Although the above snow-melting and ice-melting coating uses an organic snow-melting agent mainly composed of potassium acetate, which can reduce the corrosion of chloride ions in chloride-based snow-melting agents to the road surface or steel bars, however, when the snow-melting agent is directly mixed into the coating, it may be released too quickly in the initial stage, resulting in a short-term snow-melting effect. Therefore, it is necessary to improve the slow-release performance of the snow-melting agent in the low-corrosion snow-melting and ice-melting coating. Summary of the Invention

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

[0006] In the first aspect, a low-corrosion snow-melting and ice-melting coating provided by the present application adopts the following technical solution:

[0007] A low-corrosive snow-melting and ice-thawing coating, comprising component A, component B and component C with a mass ratio of 100:(40-50):(90-100). Based on the total weight of component A, component A comprises the following raw materials in parts by weight: 100 parts of epoxy resin, 15-25 parts of polyurethane elastomer, 2-5 parts of epoxy active diluent, 0.5-1 part of defoamer, 2-5 parts of silane coupling agent, 30-50 parts of microcapsule snow-melting agent. 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, 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. The core material comprises potassium acetate and sodium molybdate with a mass ratio of 100:(2-4).

[0008] By adopting the above technical solution, the flexible segments of the polyurethane elastomer and the rigid network of the epoxy resin form an interpenetrating structure, enabling the coating to maintain a large elongation at break and avoiding cracking during freeze-thaw cycles. The surface of the microcapsule snow-melting agent is modified by a silane coupling agent and connected to the epoxy resin through Si-O bonds, enhancing the microcapsule-matrix interfacial strength and preventing rolling-off. Potassium acetate is a low-corrosive and environmentally friendly snow-melting agent without chloride ions. Sodium molybdate and potassium acetate form a double salt in the core material. The MoO4 2- released by sodium molybdate reacts with the K + of potassium acetate to form calcium molybdate precipitation, covering the pores of the concrete 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 and quickly starting ice-thawing in the initial stage. After the wall material swells, the pore channels contract, and the subsequent release rate decreases, thus achieving a slow-release effect. Moreover, the wall material blocks the direct contact between potassium acetate and the road surface, reducing the chemical erosion of active ions on the concrete. The polyamide curing agent imparts appropriate flexibility and denseness 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 snow-melting agent in the coating and further improving the slow-release effect of the microcapsule snow-melting agent. The reinforcing filler enhances the wear resistance of the coating and protects the integrity of the microcapsule structure. Therefore, through the synergistic cooperation of the above components in this application, the slow-release effect of the snow-melting agent in the snow-melting and ice-thawing coating can be improved, enabling the snow-melting and ice-thawing coating to exert the snow-melting and ice-thawing effect for a long time. Moreover, the coating has excellent low-corrosive and anti-cracking properties.

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

[0010] By adopting the above technical solution, polyacrylic acid contains carboxylic acid groups, and polyethyleneimine contains amino groups. The two form pH-sensitive microspheres through electrostatic interaction. When freezing at low temperature, the carboxylic acid groups are protonated, and polyacrylic acid and polyethyleneimine swell, accelerating the release of the core material. When drying at room temperature, the carboxylic acid is deprotonated, and polyacrylic acid and polyethyleneimine shrink, inhibiting the ineffective release of the snow melting agent. Therefore, the release of the snow melting agent can be controlled, and the ice melting cycle can be extended.

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

[0012] By adopting the above technical solution, the SiO2 oxide layer on the surface of SiC whiskers forms hydrogen bonds with the amino groups of the polyamide curing agent, enhancing the interfacial bonding force and improving the coating peel strength. SiC whiskers adsorb phytic acid molecules to form a SiC-phytic acid composite passivation film on the metal surface, reducing the corrosion of steel bars. Moreover, the high modulus of the whiskers inhibits the propagation of microcracks in the coating under low-temperature freeze-thaw cycles, reducing the penetration path of corrosive media and inhibiting the penetration of corrosive media.

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

[0014] By adopting the above technical solution, the high specific surface area and microporous structure of zeolite powder can adsorb potassium acetate or residual chloride salts that are not coated in component A, forming a fast-slow biphasic release system with the microcapsules. The water absorption of zeolite increases under low-temperature and high-humidity conditions, promoting the release of the snow melting agent; it adsorbs and stores at high temperature and dryness, reducing ineffective losses. Moreover, phytic acid or sodium molybdate is loaded in the zeolite pores and triggered to release by changes in pH or humidity, forming a gradient protection with the free corrosion inhibitor in component B. The Al released by zeolite 3+ reacts with phytic acid to form Al - phytic acid complex, filling the microcracks in the concrete and reducing the penetration of corrosive media.

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

[0016] By adopting the above technical solution, quartz powder can significantly improve the compressive strength and wear resistance of the coating, does not react with the snow melting agent or sodium molybdate, avoids the generation of by-products, maintains the stability of the coating, and can also synergistically improve the crack resistance with silicon carbide whiskers. Hydroxyapatite is a biocompatible material without ecological toxicity, is suitable for sensitive areas, and can also neutralize acidic by-products generated during the snow melting process, reducing concrete carbonation and steel bar corrosion. Mesoporous silica can adsorb and slowly release potassium acetate, forming a two-stage release system with the microcapsules and extending the ice melting cycle.

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

[0018] By adopting the above technical solution, the phosphate group of neopentyl glycol diglycidyl ether phosphate binds to the silane coupling agent through hydrogen bonds, improving the interfacial adhesion between the microcapsule and the resin matrix. The polyether main chain of polypropylene glycol diglycidyl ether endows the coating with high flexibility and enhances the anti-freeze-thaw cracking ability. The acrylic double bond of glycidyl acrylate participates in the free radical curing reaction and forms a dense cross-linked network synergistically with the epoxy group, helping to reduce the porosity of the coating and lower the penetration of corrosive media.

[0019] Second, a preparation method of a low-corrosive snow-melting and ice-thawing coating provided by the present application adopts the following technical solution:

[0020] A preparation method of a low-corrosive snow-melting and ice-thawing coating includes the following steps:

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

[0022] Mix polyamide curing agent and phytic acid, and ball mill to obtain component B;

[0023] According to the weight ratio of component A: component B: component C = 100: (40 - 50): (90 - 100), after mixing component A and component B, then spray component A, component B, and component C onto the road surface through a two-component spray gun.

[0024] By adopting the above technical solution, heating to 60 - 65 °C can reduce the viscosity of epoxy resin, promote the formation of an interpenetrating network with polyurethane elastomer, and enhance the low-temperature toughness of the coating. Ball milling helps phytic acid to be evenly dispersed in the polyamide curing agent, avoiding local agglomeration. Mixing component A and component B first helps the complete cross-linking of epoxy resin and polyamide curing agent. Then spraying through a two-component spray gun enables the dynamic mixing of each component in the spray gun, avoiding pre-mixed gelation and ensuring the smoothness of construction.

[0025] In a specific feasible 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 dodecyl sulfate, 2 - 5 parts of sodium molybdate, and 100 parts of potassium acetate;

[0027] Potassium acetate and sodium molybdate are added to deionized water, heated to 60 - 65 °C, and stirred evenly to obtain a core material solution;

[0028] Sodium dodecyl sulfate is added to the core material solution, and shear emulsification is carried out evenly to obtain an aqueous phase emulsion;

[0029] Cyclohexane, diisocyanate and polyether polyol are mixed, heated to 40 - 50 °C, and stirred evenly to obtain a prepolymer solution;

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

[0031] By adopting the above technical scheme, sodium dodecyl sulfate reduces the water - oil interfacial tension, forms a W / O emulsion with uniform particle size, ensures that the core material is completely wrapped by the oil phase, and helps to improve the microcapsule encapsulation effect. Diisocyanate and polyether polyol cross - link with ethylenediamine to form a polyurethane wall material. Therefore, a microcapsule snow melting agent can be prepared.

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

[0033] 1. Through the synergistic cooperation of the above components, the present application can improve the slow - release effect of the snow melting agent in the snow melting and ice melting coating, enabling the snow melting and ice melting coating to play a long - term snow melting and ice melting effect. Moreover, the coating has excellent low - corrosive and anti - cracking properties.

[0034] 2. In the present application, polyacrylic acid and polyethyleneimine are preferably used, which can control the release of the snow melting agent and extend the ice melting cycle.

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

[0036] The present application will be further described in detail below with reference to examples and comparative examples.

[0037] Examples

[0038] Example 1

[0039] This example provides a low - corrosive snow melting and ice melting coating, which includes components A, B, and C with a mass ratio of 100:45:95.

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

[0041] The microcapsule deicing agent of this example is prepared according to the following steps:

[0042] Weigh the following raw materials: 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 dodecyl sulfate, 4 kg of sodium molybdate, and 100 parts of potassium acetate.

[0043] Add potassium acetate and sodium molybdate to deionized water, heat to 63 °C, and stir evenly to obtain the core material solution.

[0044] Add sodium dodecyl sulfate to the core material solution, shear and emulsify evenly to obtain the aqueous phase emulsion.

[0045] Mix cyclohexane, diisocyanate, and polyether polyol, heat to 45 °C, and stir evenly to obtain the prepolymer solution.

[0046] Gradually add the aqueous phase emulsion to the oil phase, stir evenly, then raise the temperature to 73 °C, add ethylenediamine, keep the temperature for reaction for 4.5 hours, centrifuge, remove the supernatant, wash, and dry in vacuum to obtain the microcapsule deicing agent.

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

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

[0049] This example also provides a preparation method for a low-corrosive deicing and ice-melting coating, including the following steps:

[0050] According to the ratio, mix epoxy resin, polyurethane elastomer, and epoxy active diluent, heat to 60 °C, stir evenly, then add silane coupling agent, microcapsule deicing agent, and defoamer, and stir evenly to obtain Component A.

[0051] Mix polyamide curing agent and phytic acid, and ball mill for 2 hours to obtain Component B.

[0052] According to the weight ratio of Component A:Component B:Component C = 100:45:95, mix Component A and Component B, and then spray them together with Component C onto the road surface through a two-component spray gun.

[0053] Example 2

[0054] The difference between this example and Example 1 is only that the low-corrosion snow-melting and ice-melting coating comprises component A, component B and component C with a mass ratio of 100:40:90. In the preparation method of the low-corrosion snow-melting and ice-melting coating, component A and component B are mixed according to the weight ratio of component A: component B: component C = 100:40:90, and then sprayed onto the road surface together with component C through a two-component spray gun.

[0055] Example 3

[0056] The difference between this example and Example 1 is only that the low-corrosion snow-melting and ice-melting coating comprises component A, component B and component C with a mass ratio of 100:50:100. In the preparation method of the low-corrosion snow-melting and ice-melting coating, component A and component B are mixed according to the weight ratio of component A: component B: component C = 100:50:100, and then sprayed onto the road surface together with component C through a two-component spray gun.

[0057] Example 4

[0058] The difference between this example and Example 1 is only that component A comprises the following raw materials: 100 kg of epoxy resin (E-51), 15 kg of polyurethane elastomer (grade 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 difference between this example and Example 1 is only that component A comprises the following raw materials: 100 kg of epoxy resin (E-51), 25 kg of polyurethane elastomer (grade 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 difference between this example and Example 1 is only that the core material comprises potassium acetate and sodium molybdate with a mass ratio of 100:2.

[0063] Example 7

[0064] The difference between this example and Example 1 is only that the core material comprises potassium acetate and sodium molybdate with a mass ratio of 100:4.

[0065] Example 8

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

[0067] Example 9

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

[0069] Example 10

[0070] The difference between this example and Example 1 is only that an equal amount of hydroxyapatite (100 - 200 mesh) is used to replace quartz powder (100 - 200 mesh).

[0071] Example 11

[0072] The difference between this example and Example 1 is only that an equal amount of mesoporous silica (100 - 200 mesh) is used to replace quartz powder (100 - 200 mesh).

[0073] Example 12

[0074] The difference between this example and Example 1 is only that the B component includes the following raw materials: 50 kg of polyamide curing agent (model 651), 7.5 kg of phytic acid, 2 kg of polyacrylic acid, and 2 kg of polyethyleneimine. In the preparation method of the low - corrosive snow - melting and ice - melting coating, the polyamide curing agent, phytic acid, polyacrylic acid, and polyethyleneimine are mixed and ball - milled for 2 hours to obtain the B component.

[0075] Example 13

[0076] The difference between this example and Example 1 is only that the B component includes the following raw materials: 50 kg of polyamide curing agent (model 651), 7.5 kg of phytic acid, and 4 kg of silicon carbide whiskers. In the preparation method of the 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 the B component.

[0077] Example 14

[0078] The difference between this example and Example 1 is only that the B component includes the following raw materials: 50 kg of polyamide curing agent (model 651), 7.5 kg of phytic acid, and 4 kg of zeolite powder. In the preparation method of the low - corrosive snow - melting and ice - melting coating, the polyamide curing agent, phytic acid, and zeolite powder are mixed and ball - milled for 2 hours to obtain the B component.

[0079] Example 15

[0080] The difference between this example and Example 1 is only that the B component includes the following raw materials: 50 kg of polyamide curing agent (model 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 preparation method of the low-corrosion 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 the B component.

[0081] Example 16

[0082] The difference between this example and Example 1 is only that the B component includes the following raw materials: 50 kg of polyamide curing agent (model 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 of the low-corrosion 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 the B component.

[0083] Example 17

[0084] The difference between this example and Example 1 is only that the microcapsule snow-melting agent in this example is prepared according to the following steps:

[0085] Weigh the following raw materials: 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 dodecyl sulfate, 5 kg of sodium molybdate, and 100 parts of potassium acetate.

[0086] Add potassium acetate and sodium molybdate to deionized water, heat to 60 °C, and stir evenly to obtain the core material solution.

[0087] Add sodium dodecyl sulfate to the core material solution, shear and emulsify evenly to obtain the aqueous phase emulsion.

[0088] Mix cyclohexane, diisocyanate, and polyether polyol, heat to 40 °C, and stir evenly to obtain the prepolymer solution.

[0089] Gradually add the aqueous phase emulsion to the oil phase, stir evenly, then raise the temperature to 70 °C, add ethylenediamine, keep the temperature for reaction for 5 hours, centrifuge, remove the supernatant, wash, and dry under vacuum to obtain the microcapsule snow-melting agent.

[0090] Example 18

[0091] The difference between this example and Example 1 is only that the microcapsule snow-melting agent in this example is prepared according to the following steps:

[0092] Weigh the following raw materials: 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 dodecyl sulfate, 2 kg of sodium molybdate, and 100 parts of potassium acetate.

[0093] Add potassium acetate and sodium molybdate to deionized water, heat to 65 °C, and stir evenly to obtain the core material solution.

[0094] Add sodium dodecyl sulfate to the core material solution, shear and emulsify evenly to obtain the aqueous phase emulsion.

[0095] Mix cyclohexane, diisocyanate, and polyether polyol, heat to 45 °C, and stir evenly to obtain the prepolymer solution.

[0096] Gradually add the aqueous phase emulsion to the oil phase, stir evenly, then raise the temperature to 75 °C, add ethylenediamine, keep warm and react for 4 hours, centrifuge, remove the supernatant, wash, and dry in vacuum to obtain the microcapsule snow melting agent.

[0097] Example 19

[0098] The difference between this example and Example 1 is only that in the preparation method of the low-corrosion snow melting and ice melting coating: according to the ratio, mix epoxy resin, polyurethane elastomer, and epoxy active diluent, heat to 65 °C, stir evenly, and then add silane coupling agent, microcapsule snow melting agent, and defoaming agent, stir evenly to obtain Component A.

[0099] Comparative Example

[0100] Comparative Example 1

[0101] The difference between this comparative example and Example 1 is only that in Component A, the microcapsule snow melting agent is replaced with an equal amount of potassium acetate.

[0102] Comparative Example 2

[0103] The difference between this comparative example and Example 1 is only that in Component B, the phytic acid is replaced with an equal amount of polyamide curing agent (model 651).

[0104] Comparative Example 3

[0105] The difference between this comparative example and Example 1 is only that it does not contain Component C.

[0106] Performance Detection Test

[0107] For the low-corrosion snow melting and ice melting coatings prepared in Examples 1-19 and Comparative Examples 1-3, conduct the following performance detections:

[0108] Coating release rate test of potassium acetate: Spray the low-corrosive snow-melting and ice-melting coating on the surface of a concrete specimen (150×150×15 mm). The coating thickness is 0.8±0.1 mm. After curing, completely immerse the concrete specimen with the coating in 10 L of deionized water. On the 3rd and 7th days of immersion, take samples to measure the potassium acetate concentration (mol / L), and then calculate the potassium acetate release rate according to the formula: potassium acetate release rate = (potassium acetate concentration × volume of deionized water) × relative molecular mass of potassium acetate ÷ total amount of potassium acetate in the coating × 100%, so as to obtain the potassium acetate release rates on the 3rd and 7th days of immersion.

[0109] Snow-melting and ice-melting test: In a thermostatic and humidified chamber with a temperature of -20°C ± 2°C and a humidity of ≥90%, prepare an ice layer with a thickness of 5±0.5 mm. Spray the low-corrosive snow-melting and ice-melting coating on the surface of a concrete specimen (150×150×15 mm). The coating thickness is 0.8±0.1 mm. After curing, place it on the ice layer. Simulate a solar light source with an irradiance of 1000 W / m 2 . When the ice layer completely melts, calculate the ice-melting rate (mm / h) according to the formula: ice-melting rate = ice layer thickness ÷ total time for the ice layer to completely melt.

[0110] Spray the low-corrosive snow-melting and ice-melting coating on the surface of a concrete specimen (100×100×10 mm). The coating thickness is 0.5±0.1 mm. After curing for 7 days, according to GB / T 9268-2008, detect the proportion of the cracking area of the low-corrosive snow-melting and ice-melting coating.

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

[0112] Table 1

[0113]

[0114] Combined with Example 1 and Comparative Examples 1-3 and Table 1, it can be seen that compared with Example 1, the potassium acetate release rate on the 3rd day of Comparative Example 1 increases, the potassium acetate release rate on the 7th day reaches 100%, the ice-melting rate increases, and the proportion of the cracking area significantly increases. The potassium acetate release rate on the 3rd day of Comparative Example 2 decreases, the potassium acetate release rate on the 7th day > 60%, the ice-melting rate decreases, and the proportion of the cracking area increases. The potassium acetate release rate on the 3rd day of Comparative Example 3 slightly increases, the potassium acetate release rate on the 7th day reaches 60%, and the proportion of the cracking area significantly increases. Under the raw material ratio and preparation method of Example 1, within the first 3 days of snow-melting and ice-melting, the potassium acetate release rate reaches more than 35%, and on the 7th day of snow-melting and ice-melting, the potassium acetate release rate is less than 60%. Moreover, the ice-melting rate reaches more than 2.5 mm / h, and the proportion of the cracking area is less than 2%. This shows that the raw material ratio and preparation method of Example 1 help to improve the slow-release effect of potassium acetate in the coating, and moreover, the coating has excellent snow-melting and ice-melting rates and crack resistance performance.

[0115] Combined with Examples 1-19 and Table 1, it can be seen that the potassium acetate release rate on the 3rd day of Examples 1-19 is above 35%, and the potassium acetate release rate on the 7th day is less than 60%. Moreover, the ice melting rate reaches above 2.5 mm / h, and the proportion of the cracking area is less than 2%. This shows that within the range of the raw material ratio and preparation method of Examples 1-19, it is helpful to improve the slow release effect of potassium acetate in the coating, and the coating has excellent snow melting and ice melting rates and crack resistance performance.

[0116] This specific embodiment is only an interpretation of the present application, and it is not a limitation of the present application. Those skilled in the art can make modifications to this embodiment without creative contributions according to needs after reading this specification, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

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

2. The low-corrosive snow melting and ice thawing coating according to claim 1, wherein Component B further includes polyacrylic acid and polyethyleneimine.

3. The low-corrosive snow melting and ice thawing coating according to claim 2, wherein, Component B further includes silicon carbide whiskers.

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

5. The low-corrosive snow melting and ice thawing coating according to claim 1, wherein The reinforcing filler includes at least one of quartz powder, hydroxyapatite or mesoporous silica.

6. The low-corrosive snow melting and ice thawing coating according to claim 1, wherein The epoxy active diluent is any one of neopentyl glycol diglycidyl ether phosphate, polypropylene glycol diglycidyl ether or glycidyl acrylate.

7. A method for preparing a low-corrosive snow-melting and ice-melting coating according to any one of claims 1-6, characterized in that, It includes the following steps: Mix epoxy resin, polyurethane elastomer and epoxy active diluent, heat to 60 - 65°C, stir evenly, add silane coupling agent, microcapsule deicing agent and defoamer, stir evenly to obtain component A; Mix polyamide curing agent and phytic acid, ball mill to obtain component B; According to the weight ratio of component A:component B:component C = 100:(40 - 50):(90 - 100), after mixing component A and component B, then spray component A, component B and component C onto the road surface through a two-component spray gun.

8. The preparation method of the low-corrosive snow-melting and ice-melting coating according to claim 7, characterized in that, The microcapsule deicing 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 dodecyl sulfate, 2 - 5 parts of sodium molybdate, 100 parts of potassium acetate; Add potassium acetate and sodium molybdate into deionized water, heat to 60 - 65°C, stir evenly to obtain the core material solution; Add sodium dodecyl sulfate into the core material solution, shear and emulsify evenly to obtain the aqueous phase emulsion; Mix cyclohexane, diisocyanate and polyether polyol, heat to 40 - 50°C, stir evenly to obtain the prepolymer solution; Drop the aqueous phase emulsion into the oil phase, stir evenly, then raise the temperature to 70 - 75°C, add ethylenediamine, keep warm and react for 4 - 5 hours, centrifuge, remove the supernatant, wash, and vacuum dry to obtain the microcapsule deicing agent.

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