Long afterglow visual perception type road anti-icing material and preparation method thereof

Abstract

This application discloses a long-afterglow visual perception-based road anti-icing material and its preparation method, belonging to the field of road maintenance. It consists of talc powder, a silane coupling agent, modified phosphor, and a conventional de-icing agent. Solid talc powder is placed in an ethanol solvent and stirred until a suspension is formed. An aminosilane coupling agent is added to the suspension and stirred to obtain amino-modified talc powder. Silica-modified phosphor is prepared using a sol-gel method. The phosphor-loaded talc material and de-icing agent are then used to prepare the road anti-icing material. The silane coupling agent effectively combines the phosphor with the de-icing agent matrix, constructing a stable luminescent composite system. This de-icing agent absorbs visible light during the day and continuously releases it at night. The luminescence distribution serves as a visual indicator to determine the coverage of the de-icing agent on the road surface and the need for re-spreading. This solves the problem of de-icing agent dosage during nighttime snow removal, achieving sufficient snow removal while minimizing damage to roads and the surrounding environment.

Description

Technical Field

[0001] This invention belongs to the field of road maintenance technology, specifically relating to a long-afterglow visual perception-based road anti-icing material and its preparation method. Background Technology

[0002] With technological advancements and the development of the transportation industry, ensuring safe driving at night has become a critical task in the transportation sector. Due to persistently low winter temperatures, snowfall often leads to large accumulations of snow on roads. If not cleared promptly, this snow can easily freeze, posing a serious threat to road safety. While traditional de-icing agents can effectively lower the melting point of snow and ice, they still have significant shortcomings in nighttime operations: First, nighttime snow removal has large blind spots, and conventional de-icing agents lack visual markings, making it impossible for workers to visually assess the coverage area and effectiveness. Second, without reliable visual feedback, nighttime snow removal often relies on manual patrols or large-scale repeated application, resulting in over 30% resource waste. This not only significantly increases labor and material costs but also easily leads to overlooking key road sections, further increasing road safety risks.

[0003] Currently, de-icing agents are mainly divided into two categories: organic and inorganic. Organic de-icing agents, with potassium acetate as the main component, have advantages such as fast melting speed and low corrosivity, and are commonly used in scenarios with high environmental and facility protection requirements, such as airports. However, their high production cost limits their widespread application in ordinary road maintenance. Inorganic de-icing agents are mainly composed of chloride salts, are inexpensive, and are commonly used in public road facilities such as urban roads and bridges. However, chloride salt de-icing agents are corrosive to asphalt pavements, so their performance still has considerable room for improvement. Current related innovative technologies mostly focus on improving the triggering mechanism and material structure. For example, patent CN 117070193 A discloses a method for preparing and applying a slow-release anti-icing agent, which can extend the effective melting time; patent CN 119409464 A discloses a high-strength anti-icing lightweight aggregate and its preparation method, proposing a method for preparing high-strength anti-icing lightweight aggregate using industrial waste, which improves material strength while reducing costs. Although these technologies have made some progress in cost control and anti-icing performance of road surfaces, they generally lack adaptive designs for different meteorological conditions and are difficult to fully meet the actual needs of complex winter road environments. Summary of the Invention

[0004] Technical problems to be solved: This invention provides a long-afterglow visual perception-based road anti-icing material and its preparation method. It addresses the core technical problems of existing technologies, such as the high production cost of organic de-icing agents, which limits their widespread application in ordinary road maintenance; the corrosiveness of chloride-based de-icing agents to asphalt pavements; large blind spots in nighttime snow removal operations; the lack of visual markings for conventional de-icing agents, making it impossible for operators to intuitively judge the spreading range and coverage effect; the need for reliable visual feedback in nighttime snow removal, which often relies on manual patrols or large-area repeated spreading, resulting in over 30% resource waste, significantly increasing labor and material costs, and easily leading to omissions of key road sections, further increasing road safety risks; and the general lack of adaptability to different weather conditions, making it difficult to fully meet the actual needs of complex winter road environments.

[0005] Purpose of the invention: This invention provides a long-afterglow visual perception-type road anti-icing material and its preparation method, which is applicable to road anti-icing materials for snow removal at night. It uses talc powder as a carrier and combines fluorescent powder with de-icing agent through a silane coupling agent. It stores energy through sunlight during the day and continuously releases visible light at night. Road workers can target and reapply de-icing agent through the luminous areas of the road surface at night, which improves snow removal efficiency and reduces damage to roads and the surrounding environment.

[0006] To achieve the above objectives, this application provides the following technical solution: A method for preparing a long-afterglow visual perception-based road anti-icing material specifically includes the following steps: The first step is to prepare amino-modified talc: talc solid is placed in ethanol solvent and stirred evenly to form a suspension. An aminosilane coupling agent is added to the suspension and stirred to obtain amino-modified talc. Step 2: Filter, wash and dry the ammoniated talc powder obtained in Step 1; Step 3: Prepare silica-modified phosphors using the sol-gel method; Step 4: Add the silica-modified phosphor obtained in Step 3 and the aminated talc powder to an ethanol-water solution and stir until homogeneous to obtain the phosphor-loaded talc material. Step 5: The phosphor-loaded talc material obtained in Step 4 is mixed with the de-icing agent in a certain proportion using a dry mixing process to ensure that it is evenly dispersed in the de-icing agent matrix, ultimately forming composite de-icing agent particles with long afterglow performance. The method for calculating the ratio of phosphor-loaded talc material to de-icing agent: , ; where L m Nighttime road monitoring systems generally require a road surface luminance of ≥0.1 cd·m². -2 L CThe phosphor modified and coated with SiO2 has a brightness of approximately 2.2 cd·m. -2 C0: Required phosphor concentration; C min Minimum phosphor concentration required after SiO2 modification; Step 6: The composite de-icing agent particles obtained in step 5 are sieved and dried to obtain a finished de-icing agent product with visual marking properties.

[0007] Further, in the first step, 100g of talc powder is used, the aminosilane coupling agent is γ-aminopropyltriethoxysilane and / or γ-aminopropyltrimethoxysilane, the mass of which is 0.1-5% of the mass of talc powder, the stirring conditions are stirring and reacting at 20-60℃ for 3-4h, and the ethanol solvent is a 60%-90% ethanol-water solution, the amount of which is 800-1200mL.

[0008] Furthermore, in the second step, the filter diameter is 10-25μm, the pH of the washing solution is 6.5-7.5, the drying is oven drying, the drying temperature is set to 80-100℃, the drying time is 2-6h, and the drying is carried out until the moisture content is <5wt%.

[0009] Further, in the third step, the preparation of silica-modified phosphor uses rare earth aluminate phosphors, which are pretreated at 400-600℃ for 2-6 hours; sodium silicate is dissolved in a 60%-90% ethanol-water solution, and hydrochloric acid is added to adjust the pH of the solution to 4-6 to obtain a silica sol; the pretreated rare earth aluminate phosphor is added to the prepared silica sol and stirred at a speed of 500-1200 r / min for 1-2 hours; the mixture is then allowed to stand at 20-60℃ for 4-6 hours until a stable coating layer of silica forms on the phosphor surface; solid-liquid separation is performed by centrifugation at room temperature at a speed of 4000-8000 r / min for 10-20 minutes; the mixture is washed 2-4 times with a 1:1 ethanol-water mixture (volume ratio 1:1), with a washing liquid to solid mass ratio of 5-10:1, and maintained at a stirring speed of 80-150 rpm for 5-10 minutes. The washing solution is dried under vacuum at 80-120℃ for 6-10 h until the pH of the washing solution is 6.5-7.5. The vacuum degree is -0.08~-0.1 MPa. After vacuum drying, the powder is sintered at 400-800℃ for 1-3 h.

[0010] Furthermore, in the fourth step, the ethanol-water solution is 1:1, the ratio of aminated talc to phosphor is 1-4:20, the stirring temperature is 40-80℃, the stirring time is 30-90 min, and the stirring speed is 300-500 rpm.

[0011] Furthermore, in the fifth step, the ratio of fluorescent powder to de-icing agent is 1-10:100. Nighttime road monitoring systems generally require a road surface luminous intensity L. m ≥0.1cd·m -2 The afterglow brightness L of SiO2-modified phosphor coating C 2.2 cd·m -2 Therefore, the required concentration is Furthermore, the SiO2 shell accounts for 15 wt% of the total mass of the modified particles, therefore... .

[0012] Furthermore, in the sixth step, the sieve particle size is 1-3 mm, the drying temperature is 60-100℃, and the drying time is 2-4 h until the moisture content is <5 wt%.

[0013] A long-afterglow visual perception-type road anti-icing material prepared by any of the above preparation methods.

[0014] This application provides a long-afterglow visual perception-based road anti-icing material and its preparation method, which has the following advantages compared with the prior art: 1. The preparation method of this application is simple, which improves the accuracy and efficiency of snow removal at night. The preparation process of the de-icing agent is clear and the process conditions are mild, which is conducive to industrial scale-up production. By introducing long afterglow luminescent components into the de-icing agent, it can continuously emit light at night, providing intuitive visual identification for snow removal workers. This fundamentally solves the problems of blind spreading, uneven spreading and high repetition rate of de-icing agents at night, effectively reduces the need for manpower patrols, improves the utilization efficiency of snow removal resources, and thus significantly optimizes the results of road maintenance operations at night. 2. This invention improves the water resistance of phosphors by coating them with silica, significantly improving their environmental adaptability. This allows the phosphor particles to maintain structural stability in the presence of snow and melting water. The silica coating layer can effectively block water penetration and prevent the phosphors from hydrolyzing or the fluorescence intensity from decaying, thereby ensuring that the luminescence effect remains long-lasting and reliable in low temperature, high humidity and snow melting environments. 3. This application uses an aminosilane coupling agent to achieve an organic-inorganic cross-linking interface between phosphor, talc and de-icing agent matrix. The active groups in the aminosilane coupling agent can form a stable chemical bond with the inorganic filler, and at the same time generate an effective interfacial bond with the organic matrix, thereby significantly enhancing the bonding strength and overall stability of the composite system. 4. The preparation strategy of this application not only improves the resistance of de-icing agent particles to mechanical breakage, but also reduces pulverization loss during long-distance transportation and spreading, making it exhibit higher durability and reliability in practical applications. Detailed Implementation

[0015] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and equivalent alterations or modifications also fall within the scope defined by the claims of this application.

[0016] Example 1: This example provides a method for preparing a long-afterglow visual perception-type road anti-icing material, specifically including the following steps: Step 1, Preparation of Aminated Talc: Solid talc is placed in an ethanol solvent and stirred until a suspension is formed. An aminosilane coupling agent is added to the suspension and stirred to obtain aminoinated talc. 100g of talc is used in Step 1. The aminosilane coupling agent is γ-aminopropyltriethoxysilane and / or γ-aminopropyltrimethoxysilane, with a mass of 2% of the talc mass. The stirring conditions are 30℃ for 3.5h. The ethanol solvent is an 80% ethanol-water solution, and the amount used is 800-1200mL. Step 2: Filter, wash, and dry the aminated talc powder obtained in Step 1. The filtration diameter in Step 2 is 10-25 μm, the pH of the washing solution is 7, and the drying is oven drying, with the drying temperature set at 90℃ and the drying time at 4 hours, until the moisture content is <5 wt%. Step 3: Prepare silica-modified phosphors using the sol-gel method. Rare earth aluminate phosphors are used and pretreated at 500℃ for 4 hours. Sodium silicate is dissolved in an 80% ethanol-water solution, and hydrochloric acid is added to adjust the pH to 5 to obtain a silica sol. The pretreated rare earth aluminate phosphors are added to the prepared silica sol and stirred at 900 r / min for 1.5 hours. The mixture is then allowed to stand at 30℃ for 4 hours until a stable coating layer of silica forms on the phosphor surface. Solid-liquid separation was performed by centrifugation at 6000 r / min for 15 min at room temperature. The solid was washed four times with a 1:1 ethanol-water mixture (7:1 mass ratio of washing liquid to solid) at 80-150 rpm for 8 min until the pH of the washing liquid reached 7. The washed wet powder was then vacuum dried at 100℃ for 8 h at a vacuum degree of -0.08 MPa. After vacuum drying, the powder was sintered at 600℃ for 2 h. Step 4: Add the silica-modified phosphor and aminated talc obtained in Step 3 to an ethanol-water solution in a 1:1 ratio and stir until homogeneous. The ratio of aminated talc to phosphor is 2:20. The stirring temperature is 60℃, the stirring time is 60 min, and the stirring speed is 300-500 rpm to obtain phosphor-loaded talc material. Step 5: The phosphor-loaded talc material obtained in Step 4 is mixed with the de-icing agent in a certain proportion using a dry mixing process to ensure that it is evenly dispersed in the de-icing agent matrix, ultimately forming composite de-icing agent particles with long afterglow performance. In the fifth step, the ratio of fluorescent powder to de-icing agent is 5:100. The calculation method for the ratio of the fluorescent powder-loaded talc material to the de-icing agent is as follows: , ; where L m Nighttime road monitoring systems generally require a road surface luminance of ≥0.1 cd·m². -2 L C The phosphor modified and coated with SiO2 has a brightness of 2.2 cd·m. -2 C0: Required phosphor concentration C min The SiO2 shell accounts for 15 wt% of the total mass of the modified particles, therefore ; Step 6: The composite de-icing agent particles obtained in Step 5 are sieved and dried. The sieved particle size is 2 mm, the drying temperature is 80℃, and the drying time is 3 hours, until the moisture content is <5 wt%, resulting in a finished de-icing agent product with visual marking properties.

[0017] The embodiments selected in the above materials are for ease of understanding and not for limiting the process method. Those skilled in the art can easily modify the process flow or transfer it to other cases without inventive change. If these modifications also fall under the category of similar claims or similar technology of this invention, then the intent of this invention also includes these modifications.

Claims

1. A method for preparing a long-afterglow, visually perceptible road anti-icing material, characterized in that, Specifically, the following steps are included: The first step is to prepare amino-modified talc: talc solid is placed in ethanol solvent and stirred evenly to form a suspension. An aminosilane coupling agent is added to the suspension and stirred to obtain amino-modified talc. Step 2: Filter, wash and dry the amino-modified talc powder obtained in Step 1; Step 3: Prepare silica-modified phosphors using the sol-gel method; Step 4: Add the silica-modified phosphor obtained in Step 3 and the aminated talc powder to an ethanol-water solution and stir until homogeneous to obtain the phosphor-loaded talc material. Step 5: The phosphor-loaded talc material obtained in Step 4 is mixed with the de-icing agent in a certain proportion using a dry mixing process to ensure that it is evenly dispersed in the de-icing agent matrix, ultimately forming composite de-icing agent particles with long afterglow performance. The method for calculating the ratio of phosphor-loaded talc material to de-icing agent: , ; where L m Nighttime road monitoring systems generally require a road surface luminance of ≥0.1 cd·m². -2 L C The phosphor modified and coated with SiO2 has a brightness of approximately 2.2 cd·m. -2 C0: Required phosphor concentration; C min Minimum phosphor concentration required after SiO2 modification; Step 6: The composite de-icing agent particles obtained in step 5 are sieved and dried to obtain a finished de-icing agent product with visual marking properties.

2. The preparation method of the long afterglow visual perception type road anti-icing material according to claim 1, characterized in that, In the first step, 100g of talc powder is used, the aminosilane coupling agent is γ-aminopropyltriethoxysilane and / or γ-aminopropyltrimethoxysilane, and its mass is 0.1-5% of the talc powder mass. The stirring conditions are stirring and reacting at 20-60℃ for 3-4 hours. The ethanol solvent is a 60%-90% ethanol-water solution, and the amount used is 800-1200mL.

3. The preparation method of the long afterglow visual perception-type road anti-icing material according to claim 1, characterized in that, In the second step, the filter diameter is 10-25μm, the pH of the washing solution is 6.5-7.5, and the drying is oven drying, with the drying temperature set at 80-100℃ and the drying time at 2-6h, until the moisture content is <5wt%.

4. The preparation method of the long afterglow visual perception type road anti-icing material according to claim 1, characterized in that, The preparation of silica-modified phosphor in the third step uses rare earth aluminate phosphors, which are pretreated at 400-600℃ for 2-6 hours. Sodium silicate is dissolved in a 60%-90% ethanol-water solution, and hydrochloric acid is added to adjust the pH of the solution to 4-6 to obtain a silica sol. The pretreated rare earth aluminate phosphor is added to the prepared silica sol and stirred at a speed of 500-1200 r / min for 1-2 hours. The mixture is then allowed to stand at 20-60℃ for 4-6 hours until a stable coating layer of silica forms on the phosphor surface. Solid-liquid separation is performed by centrifugation at a speed of 4000-8000 r / min at room temperature for 10-20 minutes. The mixture is then washed 2-4 times with a 1:1 ethanol-water mixture (wash liquid to solid mass ratio of 5-10:1) and maintained at a stirring speed of 80-150 rpm for 5-10 minutes. The washing solution is dried under vacuum at 80-120℃ for 6-10 h until the pH of the washing solution is 6.5-7.

5. The vacuum degree is -0.08~-0.1 MPa. After vacuum drying, the powder is sintered at 400-800℃ for 1-3 h.

5. The preparation method of the long afterglow visual perception type road anti-icing material according to claim 1, characterized in that, The fourth step involves a 1:1 ethanol-water solution, with the ratio of aminated talc to phosphor being 1-4:

20. The stirring temperature is 40-80℃, the stirring time is 30-90 min, and the stirring speed is 300-500 rpm.

6. The preparation method of the long afterglow visual perception type road anti-icing material according to claim 1, characterized in that, In the fifth step, the ratio of fluorescent powder to de-icing agent is 1-10:

100. Nighttime road monitoring systems generally require a road surface luminous intensity of L. m ≥0.1cd·m -2 The afterglow brightness L of SiO2-modified phosphor coating C 2.2 cd·m -2 Therefore, the required concentration is Furthermore, the SiO2 shell accounts for 15 wt% of the total mass of the modified particles, therefore... .

7. The preparation method of the long afterglow visual perception-type road anti-icing material according to claim 1, characterized in that, In the sixth step, the sieve particle size is 1-3 mm, the drying temperature is 60-100℃, and the drying time is 2-4 h until the moisture content is <5 wt%.

8. A long-afterglow visual perception-type road anti-icing material prepared by the preparation method according to any one of claims 1-7.