Low-temperature efficient snow melting agent

Abstract

The invention provides a low-temperature efficient snow-melting agent. The low-temperature efficient snow-melting agent is prepared from the following raw materials in percentage by mass: 43-47% of a snow-melting repairing layer, 28-32% of a corrosion and controlled release layer and 23-37% of an anti-freezing layer, wherein the anti-freezing layer wraps the corrosion and controlled release layer, and the corrosion and controlled release layer wraps the snow melting repairing layer; through the catalytic action of a nano silicon dioxide loaded copper catalyst in the anti-freezing layer and the synergistic snow melting effect of straw modified carboxylate and high-purity calcium chloride in the snow melting repairing layer, the snow melting reaction can be quickly started in the extremely cold environment of minus 35 DEG C; the technical bottlenecks of efficiency attenuation and slow starting of the existing snow melting agent in an extremely cold environment are effectively solved, and the road traffic safety in a low-temperature region is guaranteed.

Description

A low-temperature high-efficiency snow melting agent Technical Field

[0001] This invention relates to the field of road repair technology, and in particular to a low-temperature, high-efficiency snow melting agent. Background Technology

[0002] Winter road icing and snow cover can easily lead to traffic accidents. De-icing agents, as highly efficient de-icing and snow-melting materials, play a crucial role in road maintenance. Currently, de-icing agents on the market are mainly divided into three categories: chloride salts, organic acid salts, and composite types. However, in practical applications, there are still many technical bottlenecks that make it difficult to meet the comprehensive needs of extreme cold environments, ecological protection, and infrastructure protection.

[0003] While existing chloride-based snow-melting agents (such as sodium chloride and calcium chloride) are inexpensive and melt snow quickly, they have a narrow applicable temperature range. Their snow-melting efficiency decreases significantly below -15℃ and they basically lose their activity above -25℃. At the same time, chloride ions in chloride salts can easily accelerate the corrosion of carbon steel and cause concrete spalling, which seriously shortens the service life of infrastructure such as bridges and roads. Furthermore, excessive use can cause soil salinization, water pollution, and damage to the surrounding ecological environment.

[0004] Although organic acid salt-based snow melting agents (such as potassium acetate and calcium magnesium acetate) have low corrosivity and good environmental performance, they have problems such as low snow melting efficiency, high applicable temperature (generally not lower than -20℃) and high production cost, making it difficult to promote and apply them on a large scale.

[0005] Existing composite de-icing agents attempt to combine the advantages of chloride salts and organic salts, which improves low-temperature adaptability and corrosivity to some extent, but still have the following drawbacks: First, the de-icing speed is slow in extremely cold environments, usually requiring more than 10 minutes to start the reaction; second, the corrosion inhibitors are mostly of a single type, and their protective effect is unstable over a wide temperature range (especially in extremely cold environments below -20℃); third, they lack ecological restoration functions, and the residual components after snow melting may still have adverse effects on soil and vegetation; fourth, their long-term effectiveness is insufficient, with the effective action time mostly within 24 hours, requiring frequent reapplication and increasing operating costs; fifth, the brine formed after snow melting is prone to refreezing at night when temperatures are low, forming "black ice," which still poses a traffic safety hazard. Summary of the Invention

[0006] In view of this, the present invention aims to provide a low-temperature, high-efficiency snow melting agent to solve or alleviate the technical problems existing in the prior art, and at least provide a beneficial alternative.

[0007] The technical solution of this invention is implemented as follows: A low-temperature, high-efficiency snow-melting agent, comprising the following raw materials: the raw materials by mass percentage are: 43-47% snow-melting repair layer, 28-32% corrosion-inhibiting and controlled-release layer, and 23-37% antifreeze layer; wherein, the antifreeze layer coats the corrosion-inhibiting and controlled-release layer, and the corrosion-inhibiting and controlled-release layer coats the snow-melting repair layer; the snow-melting agent has a particle size of 2-4 mm and a density of 1.1 g-1.5 g / cm³. 3 .

[0008] In some embodiments, the snow melting repair layer comprises the following components by mass percentage: 28-32% straw-modified carboxylate, 10-14% high-purity calcium chloride, 1-3% natural zeolite powder, and 0.5-1.5% Bacillus subtilis inoculant; wherein the straw-modified carboxylate is prepared from agricultural waste straw through alkaline hydrolysis and carboxylation.

[0009] In some embodiments, the corrosion-inhibiting and controlled-release layer comprises the following components by weight percentage: 18-22% biodegradable starch-polylactic acid composite microcapsules, 4-6% biomimetic mineralizer, and 4-6% composite corrosion inhibitor.

[0010] In some embodiments, the biodegradable starch-polylactic acid composite microcapsules are temperature-humidity dual-responsive, degrading slowly only when the humidity is ≥80% and the temperature is below -0℃.

[0011] In some embodiments: the biomimetic mineralizer is a composite system of calcium phosphate and chitosan; the composite corrosion inhibitor is composed of phytic acid and benzotriazole in a mass ratio of 1:1.

[0012] In some embodiments, the antifreeze layer comprises the following components by mass percentage: 4-6% nano-silica supported copper catalyst, 13-17% phase change energy storage material, and 4-6% biodegradable polylactic acid membrane.

[0013] In some embodiments: the particle size of the nano-silica supported copper catalyst is 50-100 nm; the phase change energy storage material is a composite system of polyethylene glycol-4000 and vermiculite, with a phase change temperature of -15℃.

[0014] In some embodiments: in an extremely cold environment of -35℃, the snow melting agent has a snow melting start-up time of ≤2 minutes, a snow melting rate of ≥90% in 30 minutes, and an effective action time of ≥72 hours.

[0015] In some embodiments: the corrosion rate of the de-icing agent on carbon steel is ≤0.008 g / m 2 •h, reduces concrete spalling rate by 95%; soil salinity after snow melting is ≤0.2%, and COD in water discharge is ≤40mg / L.

[0016] The embodiments of the present invention have the following advantages due to the adoption of the above technical solutions: First, the present invention utilizes the catalytic effect of the copper catalyst supported on nano-silica in the antifreeze layer, combined with the synergistic snow melting effect of straw-modified carboxylate and high-purity calcium chloride in the snow melting and repair layer, to quickly initiate the snow melting reaction in an extremely cold environment of -35℃. This effectively solves the technical bottleneck of existing snow melting agents having reduced efficiency and slow start-up in extremely cold environments, ensuring the safety of road traffic in low-temperature areas.

[0017] Second, the corrosion-inhibiting and controlled-release layer of this invention uses temperature-humidity dual-response biodegradable microcapsules loaded with biomimetic mineralizers and composite corrosion inhibitors. Phytic acid is suitable for corrosion inhibition requirements from room temperature to -20°C, while benzotriazole is suitable for corrosion inhibition requirements in extremely cold environments from -20°C to -35°C, synergistically achieving protection across the entire temperature range. At the same time, the biomimetic mineralizer can form a dense mineral film on the surface of infrastructure, actively isolating salt erosion and significantly extending the service life of infrastructure such as bridges and roads.

[0018] Third, the snow melting and repair layer of this invention uses straw-modified carboxylate prepared from agricultural waste as the core snow melting component, which can be naturally degraded. Combined with the salt adsorption effect of natural zeolite powder and the soil improvement effect of Bacillus subtilis inoculant, it not only eliminates the risk of soil salinization and water pollution, but also improves the soil microbial environment, promotes vegetation growth, and solves the ecological pollution problem of existing snow melting agents.

[0019] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 is a flowchart of the snow melting agent preparation method according to an embodiment of the present invention. Detailed Implementation

[0022] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0023] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0024] As shown in Figure 1, this embodiment of the invention provides a low-temperature, high-efficiency snow-melting agent, comprising the following raw materials: by mass percentage, the raw materials are: 43-47% snow-melting repair layer, 28-32% corrosion-inhibiting and controlled-release layer, and 23-37% antifreeze layer; wherein, the antifreeze layer coats the corrosion-inhibiting and controlled-release layer, and the corrosion-inhibiting and controlled-release layer coats the snow-melting repair layer; the snow-melting agent has a particle size of 2-4 mm and a density of 1.1 g-1.5 g / cm³. 3 .

[0025] In this embodiment, the snow melting repair layer comprises the following components by mass percentage: 28-32% straw-modified carboxylate, 10-14% high-purity calcium chloride, 1-3% natural zeolite powder, and 0.5-1.5% Bacillus subtilis inoculant; wherein, the straw-modified carboxylate is prepared from agricultural waste straw through alkaline hydrolysis and carboxylation.

[0026] In this embodiment, the corrosion-inhibiting and controlled-release layer comprises the following components by mass percentage: 18-22% biodegradable starch-polylactic acid composite microcapsules, 4-6% biomimetic mineralizer, and 4-6% composite corrosion inhibitor.

[0027] In this embodiment, the biodegradable starch-polylactic acid composite microcapsules are temperature-humidity dual-response type, and degrade slowly only when the humidity is ≥80% and the temperature is below -0℃.

[0028] In this embodiment: the biomimetic mineralizer is a composite system of calcium phosphate and chitosan; the composite corrosion inhibitor is composed of phytic acid and benzotriazole in a mass ratio of 1:1.

[0029] In this embodiment, the antifreeze layer comprises the following components by mass percentage: 4-6% nano-silica supported copper catalyst, 13-17% phase change energy storage material, and 4-6% biodegradable polylactic acid membrane.

[0030] In this embodiment: the particle size of the copper catalyst supported on nano-silica is 50-100nm; the phase change energy storage material is a composite system of polyethylene glycol-4000 and vermiculite, and the phase change temperature is -15℃.

[0031] In this embodiment: in an extremely cold environment of -35℃, the snow melting agent has a snow melting start-up time of ≤2 minutes, a snow melting rate of ≥90% in 30 minutes, and an effective action time of ≥72 hours.

[0032] In this embodiment: the corrosion rate of the de-icing agent on carbon steel is ≤0.008g / m 2 •h, reduces concrete spalling rate by 95%; soil salinity after snow melting is ≤0.2%, and COD in water discharge is ≤40mg / L.

[0033] The preparation of this snow melting agent includes the following steps: 1. Core forming: The snow melting repair layer mixed powder is put into a granulator, an appropriate amount of deionized water is added as a binder, and granulation is carried out to form snow melting repair layer core particles with a particle size of 1.5-2.5mm, and dried to a moisture content of ≤5%.

[0034] 2. Middle layer coating: The dried snow melting repair layer core particles are fed into a fluidized bed coating machine. The corrosion inhibition and controlled release layer mixture is evenly sprayed onto the surface of the core particles. At the same time, hot air (temperature 50℃) is introduced for drying. The coating thickness is controlled so that the core particle size reaches 2.5-3.5mm, resulting in core-shell structured particles (snow melting repair layer + corrosion inhibition and controlled release layer). The particles are dried until the moisture content is ≤3%.

[0035] 3. Outer Coating: The core-shell structured particles are fed back into a fluidized bed coating machine, where the antifreeze mixture is evenly sprayed onto the particle surface. Hot air (45℃) is then introduced for drying, controlling the coating thickness to achieve a final particle size of 2-4mm. After drying, particles with the required size are screened out to obtain the low-temperature, high-efficiency de-icing agent. The density of the finished product is measured to be 1.3g / cm³. 3 It meets the design requirements.

[0036] The following detailed description of the low-temperature high-efficiency snow melting agent of the present invention, with reference to specific embodiments, is intended to make the technical solution of the present invention clearer and easier to understand, rather than to limit the scope of protection of the present invention.

[0037] I. Raw Material Ratio This embodiment selects the median values ​​of the parameters defined in the above embodiments for preparation to ensure stable product performance and easy industrial production. The specific raw material ratio is as follows: 1. Overall Ratio (mass percentage): Snow melting repair layer 45%, corrosion inhibition and controlled release layer 30%, antifreeze layer 25%; 2. Snow melting repair layer composition (mass percentage, based on the total mass of the snow melting repair layer): Straw modified carboxylate 30%, high-purity calcium chloride 12%, natural zeolite powder 2%, Bacillus subtilis inoculant 1%; 3. Corrosion inhibition and controlled release layer composition (mass percentage, based on the total mass of the corrosion inhibition and controlled release layer): Biodegradable starch-polylactic acid composite microcapsules 20%, biomimetic mineralizer 5%, composite corrosion inhibitor 5%; 4. Antifreeze layer composition (mass percentage, based on the total mass of the antifreeze layer): Nano-silica supported copper catalyst 5%, phase change energy storage material 15%, biodegradable polylactic acid membrane 5%; 5. Product target parameters: Particle size 2-4mm, density 1.3g / cm³ 3 .

[0038] II. Raw Material Pretreatment and Preparation of Each Layer (I) Preparation of Snow Melting Repair Layer 1. Preparation of Straw-Modified Carboxylate: Select agricultural waste corn straw and crush it into 80-100 mesh powder; add 10% sodium hydroxide solution at a solid-liquid ratio of 1:10 (g / mL) and alkali hydrolyze in an 80℃ water bath for 2 hours, stirring once every 30 minutes during the process; after alkali hydrolysis, filter and wash the filter residue with deionized water until neutral; then add 8% chloroacetic acid solution at a solid-liquid ratio of 1:8 (g / mL) to the filter residue and carboxylate in a 60℃ water bath for 3 hours; after the reaction, filter and vacuum dry (temperature 60℃, vacuum degree -0.08MPa) to obtain straw-modified carboxylate powder, whose freezing point was tested to be -28℃.

[0039] 2. Snow Melting Repair Layer Mixing: Mix 30 kg of prepared straw modified carboxylate, 12 kg of high-purity calcium chloride (purity ≥ 94%), 2 kg of natural zeolite powder (particle size 200 mesh), and Bacillus subtilis inoculant (effective viable count ≥ 2 × 10⁻⁶). 9 1 kg of CFU / g was added to a double-helix conical mixer, the speed was set to 60 r / min, and the mixing time was 30 min to obtain a uniform snow melting repair layer mixed powder.

[0040] (II) Preparation of the corrosion-inhibiting and controlled-release layer 1. Preparation of biodegradable starch-polylactic acid composite microcapsules: Starch and polylactic acid were used as wall material raw materials in a mass ratio of 1:1, and an appropriate amount of deionized water was added to prepare a mixed solution with a mass concentration of 15%; the mixed solution was added to a spray dryer, and the inlet air temperature was set to 120℃, the outlet air temperature to 60℃, and the atomization pressure to 0.3MPa to obtain biodegradable starch-polylactic acid composite microcapsules with a particle size of 200-500μm; the microcapsules were tested and found to be temperature-humidity dual-response type, and only slowly degraded when the humidity was ≥80% and the temperature was below 0℃.

[0041] 2. Preparation of composite corrosion inhibitor: Weigh 5 kg of phytic acid and 5 kg of benzotriazole at a mass ratio of 1:1, add an appropriate amount of anhydrous ethanol and stir to dissolve, stir at a constant temperature in a 40℃ water bath for 1 h, cool and vacuum dry to remove ethanol to obtain solid composite corrosion inhibitor powder.

[0042] 3. Mixing of the corrosion-inhibiting and controlled-release layer: 20 kg of biodegradable starch-polylactic acid composite microcapsules, 5 kg of biomimetic mineralizing agent (calcium phosphate and chitosan in a mass ratio of 2:1) and 5 kg of the above-prepared composite corrosion inhibitor were put into a high-speed mixer. The speed was set to 120 r / min and the mixing time was 20 min to obtain the mixture of corrosion-inhibiting and controlled-release layer materials.

[0043] (III) Preparation of the antifreeze layer 1. Preparation of copper catalyst supported on nano-silica: Nano-silica with a particle size of 50-100nm was selected as the carrier, and copper ions were loaded by impregnation method; the nano-silica was added to a copper sulfate solution with a mass concentration of 5% at a solid-liquid ratio of 1:5 (g / mL), and stirred and impregnated in a water bath at 50℃ for 4h; after filtration, it was washed with deionized water until no sulfate ions were found, and then a reducing agent (sodium borohydride solution with a mass concentration of 10%) was added to reduce the copper ions to elemental copper. Finally, it was vacuum dried (temperature 50℃, vacuum degree -0.09MPa) to obtain the copper catalyst supported on nano-silica.

[0044] 2. Preparation of phase change energy storage material: 13.5 kg of polyethylene glycol-4000 and 1.5 kg of vermiculite were weighed at a mass ratio of 3:1. The polyethylene glycol-4000 was heated to 60℃ to melt it. Vermiculite powder was added and stirred evenly. The mixture was kept at a constant temperature for 30 min. After cooling, it was pulverized into 100-mesh powder to obtain the phase change energy storage material. The phase change temperature of the material was found to be -15℃.

[0045] 3. Antifreeze layer mixing: 5 kg of nano-silica supported copper catalyst, 15 kg of the above phase change energy storage material, and 5 kg of biodegradable polylactic acid membrane (crushed to 100 mesh powder) are put into a mixer. The speed is set to 80 r / min and the mixing time is 25 min to obtain the antifreeze layer mixture.

[0046] III. The overall composite molding adopts a layered coating process to achieve a three-layer composite molding. The specific steps are as follows: 1. Core molding: The snow melting repair layer mixed powder is put into a granulator, and an appropriate amount of deionized water is added as a binder to granulate and form snow melting repair layer core particles with a particle size of 1.5-2.5mm. The particles are then dried until the moisture content is ≤5%.

[0047] 2. Middle layer coating: The dried snow melting repair layer core particles are fed into a fluidized bed coating machine. The corrosion inhibition and controlled release layer mixture is evenly sprayed onto the surface of the core particles. At the same time, hot air (temperature 50℃) is introduced for drying. The coating thickness is controlled so that the core particle size reaches 2.5-3.5mm, resulting in core-shell structured particles (snow melting repair layer + corrosion inhibition and controlled release layer). The particles are dried until the moisture content is ≤3%.

[0048] 3. Outer Coating: The core-shell structured particles are fed back into a fluidized bed coating machine, where the antifreeze mixture is evenly sprayed onto the particle surface. Hot air (45℃) is then introduced for drying, controlling the coating thickness to achieve a final particle size of 2-4mm. After drying, particles with the required size are screened out to obtain the low-temperature, high-efficiency de-icing agent. The density of the finished product is measured to be 1.3g / cm³. 3 It meets the design requirements.

[0049] IV. Performance Testing and Verification The performance of the low-temperature high-efficiency snow-melting agent prepared in this embodiment was tested. The test methods and results are as follows: (I) Low-temperature snow-melting performance test An extremely cold environment of -35℃ was simulated in an artificial climate chamber. A uniform snow and ice layer with a thickness of 5cm was laid, and the snow-melting agent of this embodiment was spread at a dosage of 0.4kg / ㎡. The snow-melting start-up time, the snow-melting rate at 30 minutes, and the effective action time were recorded. Test results: The snow-melting start-up time was 1.8 minutes, the snow-melting rate at 30 minutes was 92%, and the effective action time was 75 hours, all of which are superior to the performance indicators specified in the claims (start-up time ≤ 2 minutes, snow-melting rate ≥ 90%, effective time ≥ 72 hours).

[0050] (II) Corrosion Performance Testing: Corrosion testing was conducted on carbon steel specimens and concrete blocks according to the national standard GB / T23851-2021 "De-icing Agents". Test results: The corrosion rate on carbon steel was 0.007 g / m³. 2 ·h (≤0.008g / m 2 •h), reducing the concrete spalling rate by 96% (≥95%), meeting the protective performance defined in the claims.

[0051] (III) Ecological Safety Performance Test: Water solutions were collected after snowmelt to test soil salinity and COD levels. Simultaneously, a potted plant experiment was conducted to observe the growth of common roadside vegetation (holly). Test results: Soil salinity after snowmelt was 0.19% (≤0.2%), and COD in the discharged water was 39 mg / L (≤40 mg / L). The holly in the potted plant experiment grew normally without wilting or yellowing, indicating good ecological safety of the product.

[0052] V. Other Embodiments Besides the embodiments described above, the present invention can also prepare products using other values ​​within the parameter range defined in the claims. For example: 1. Example 2: Snow melting repair layer 43%, corrosion-inhibiting and controlled-release layer 28%, antifreeze layer 29%; the snow melting repair layer contains 28% straw-modified carboxylates and 10% high-purity calcium chloride; the corrosion-inhibiting and controlled-release layer contains 18% biodegradable starch-polylactic acid composite microcapsules; the antifreeze layer contains 4% nano-silica supported copper catalyst; product particle size 2-3 mm, density 1.1 g / cm³ 3 Testing showed that the product of this embodiment had a snow melting start-up time of ≤2 minutes and a snow melting rate of ≥90% within 30 minutes at -35℃, which meets the requirements of the claims.

[0053] 2. Example 3: Snow melting repair layer 47%, corrosion-inhibiting and controlled-release layer 32%, antifreeze layer 21%; the snow melting repair layer contains 32% straw-modified carboxylates and 14% high-purity calcium chloride; the corrosion-inhibiting and controlled-release layer contains 22% biodegradable starch-polylactic acid composite microcapsules; the antifreeze layer contains 6% nano-silica supported copper catalyst; product particle size 3-4mm, density 1.5g / cm³. 3Testing showed that the performance of the product in this embodiment also meets the specifications defined in the claims.

[0054] The above embodiments are merely preferred embodiments of the present invention. Those skilled in the art can make appropriate adjustments to the raw material ratio and preparation process parameters within the technical scope defined in the claims according to actual production needs, and all such adjustments fall within the protection scope of the present invention.

Claims

1. A low-temperature, high-efficiency snow-melting agent, characterized in that, The product comprises the following raw materials: by mass percentage, the raw materials are: 43-47% snow-melting repair layer, 28-32% corrosion-inhibiting and controlled-release layer, and 23-37% antifreeze layer; wherein the antifreeze layer coats the corrosion-inhibiting and controlled-release layer, and the corrosion-inhibiting and controlled-release layer coats the snow-melting repair layer; the snow-melting agent has a particle size of 2-4 mm and a density of 1.1 g-1.5 g / cm³. 3 .

2. The low-temperature high-efficiency snow melting agent according to claim 1, characterized in that: The snow melting repair layer comprises the following components by mass percentage: 28-32% straw-modified carboxylate, 10-14% high-purity calcium chloride, 1-3% natural zeolite powder, and 0.5-1.5% Bacillus subtilis inoculant; wherein the straw-modified carboxylate is prepared from agricultural waste straw through alkaline hydrolysis and carboxylation.

3. The low-temperature high-efficiency snow melting agent according to claim 1, characterized in that: The corrosion-inhibiting and controlled-release layer comprises the following components by weight percentage: 18-22% biodegradable starch-polylactic acid composite microcapsules, 4-6% biomimetic mineralizer, and 4-6% composite corrosion inhibitor.

4. The low-temperature high-efficiency snow melting agent according to claim 3, characterized in that: The biodegradable starch-polylactic acid composite microcapsules are temperature-humidity dual-response type, and degrade slowly only when the humidity is ≥80% and the temperature is below -0℃.

5. The low-temperature high-efficiency snow melting agent according to claim 3, characterized in that: The biomimetic mineralizer is a composite system of calcium phosphate and chitosan; the composite corrosion inhibitor is composed of phytic acid and benzotriazole in a mass ratio of 1:

1.

6. The low-temperature high-efficiency snow melting agent according to claim 1, characterized in that: The antifreeze layer comprises the following components by mass percentage: 4-6% nano-silica supported copper catalyst, 13-17% phase change energy storage material, and 4-6% biodegradable polylactic acid membrane.

7. The low-temperature high-efficiency snow melting agent according to claim 6, characterized in that: The nano-silica-supported copper catalyst has a particle size of 50-100 nm; the phase change energy storage material is a composite system of polyethylene glycol-4000 and vermiculite, with a phase change temperature of -15℃.

8. The low-temperature high-efficiency snow melting agent according to claim 1, characterized in that: In extremely cold environments of -35℃, the snow melting agent has a snow melting start-up time of ≤2 minutes, a snow melting rate of ≥90% in 30 minutes, and an effective action time of ≥72 hours.

9. The low-temperature high-efficiency snow melting agent according to claim 1, characterized in that: The de-icing agent has a corrosion rate of ≤0.008 g / m² on carbon steel. 2 •h, reduces concrete spalling rate by 95%; soil salinity after snow melting is ≤0.2%, and COD in water discharge is ≤40mg / L.

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