Bio-based environment-friendly pavement freezing inhibitor and preparation method thereof

Abstract

The invention relates to the technical field of anti-freezing materials, and discloses a bio-based environment-friendly pavement freezing inhibitor and a preparation method thereof, the bio-based environment-friendly pavement freezing inhibitor is prepared from the following raw materials by weight: 20-30 parts of a bio-based anti-freezing agent, 10-15 parts of an organic acid salt, 12-18 parts of polyol, 10-15 parts of a functional auxiliary agent, 6-12 parts of a synergistic auxiliary agent, 5-10 parts of a bio-based corrosion inhibitor, 15-30 parts of a bio-based filler and 30-40 parts of deionized water. The preparation method comprises the following steps: S1, mixing the bio-based antifreeze agent, the organic acid salt, the polyol, the functional additive and the synergistic additive; s2, uniformly spraying the bio-based slow-release agent solution on the surface of the mixed material through an atomizing nozzle; and S3, mixing the bio-based filler, the coated product and deionized water, drying, and crushing to obtain the bio-based environment-friendly pavement freezing inhibitor. The anti-icing device is suitable for anti-icing operation in winter in cold region roads, airports, bridges and other scenes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of anti-freezing materials, in particular to a bio-based environment-friendly pavement freezing inhibitor and a preparation method thereof. BACKGROUND

[0002] In winter, snowfall and low-temperature weather can cause the pavement to freeze, bringing great safety hazards to road traffic. The traditional response method is mainly to sprinkle snow-melting agent. However, the commonly used chlorinated salt type snow-melting agent can melt ice and snow to some extent, but has many drawbacks. On the one hand, it has strong corrosiveness to road infrastructure, bridge reinforcement, etc., which can significantly shorten the service life of roads and bridges; on the other hand, the snow-melting agent flows into the soil and water body with snow water, which can pollute the ecological environment, affect plant growth, and destroy the ecological balance of water bodies. In addition, although some new anti-freezing materials use non-chlorinated salt components, they still have problems such as high cost and complex preparation process, which are difficult to be widely applied.

[0003] In order to solve the above problems, some active anti-freezing technologies and materials have appeared in recent years. For example, some materials reduce the freezing point by releasing salt inside the pavement, but these materials are mainly chlorinated salt, which still has potential harm to the environment. Therefore, it is of great practical significance to develop a high-efficiency, environment-friendly and low-temperature-resistant pavement freezing inhibitor. SUMMARY

[0004] (I) Technical problems to be solved

[0005] In view of the deficiencies of the prior art, the present application provides a bio-based environment-friendly pavement freezing inhibitor and a preparation method thereof.

[0006] (II) Technical scheme

[0007] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme: a bio-based environment-friendly pavement freezing inhibitor is prepared from the following raw materials by weight:

[0008] 20-30 parts of bio-based anti-freezing agent, 10-15 parts of organic acid salt, 12-18 parts of polyol, 10-15 parts of functional additive, 6-12 parts of synergistic additive, 5-10 parts of bio-based corrosion inhibitor, 15-30 parts of bio-based filler and 30-40 parts of deionized water;

[0009] The preparation method comprises the following steps:

[0010] S1, the bio-based anti-freezing agent, the organic acid salt, the polyol, the functional additive, the synergistic additive are placed in a high-speed mixer, and mixed at a speed of 200-300 r / min for 10-15 min;

[0011] S2, the bio-based slow-release agent solution is uniformly sprayed on the surface of the mixture by an atomizing nozzle, and stirring is performed while spraying, the stirring speed is controlled at 150-200 r / min, and the atomizing pressure is controlled at 0.2-0.3 MPa;

[0012] S3, the bio-based filler is placed in a container, the coated product and deionized water are slowly added, stirring is performed at a speed of 80-100 r / min at room temperature for 2-3 h, the mixture is dried in a vacuum drying oven at 60-70℃ under a vacuum degree of 0.08-0.09 MPa for 4-6 h, and then the mixture is transferred to a pulverizer, pulverized to 80-100 mesh, and a bio-based environmentally friendly road freezing inhibitor is obtained.

[0013] Further, the preparation method of the bio-based anti-freezing agent comprises the following steps:

[0014] A1, the collected anti-freezing plant sample is gently washed in flowing clean water, the washing time is controlled at 5-10 min, the washed plant sample is laid on a tray, and then placed in a forced air drying oven, the temperature is set to 40-50℃, and the sample is dried for 12-24 h until the water content is reduced to less than 10%, then the dried plant sample is transferred to a pulverizer, and pulverized into a powder with a particle size of about 80-120 mesh;

[0015] A2, the plant powder and deionized water are mixed at a ratio of 1 g:10-20 mL, placed in a constant temperature water bath, stirred and extracted at 60-80℃ for 2-3 h, after the extraction is completed, the mixture is cooled to room temperature, then centrifuged at 4℃ and 8000-10000 r / min for 15-20 min, the supernatant is collected, and an anti-freezing active ingredient solution is obtained;

[0016] A3, the anti-freezing active ingredient solution is uniformly stirred with lecithin with a total mass of 0.5-1% and glycerol with a total mass of 10-20%, the stirring speed is controlled at 10000-15000 r / min, the stirring time is 10-15 min, a uniform mixture is formed, and the bio-based anti-freezing agent is obtained.

[0017] Further, the anti-freezing plant is one of oat straw, reed root and sea buckthorn.

[0018] Further, the preparation method of the functional auxiliary agent comprises the following steps:

[0019] Rice husk is placed in 0.07-0.12 g / mL citric acid solution at a solid-liquid ratio of 0.03-0.06 g / mL, treated at 85-95°C and 80-110 r / min for 1-2 h, then placed in an oven at 55-65°C for 10-20 h, and crushed to 150-250 meshes to obtain a powder; the powder is placed in deionized water at a solid-liquid ratio of 0.035-0.045 g / mL, mixed at 130-150 r / min for 10-15 min, and 3-6% of bamboo charcoal material by mass of the powder is added, treated at 45-55°C and 55-65 r / min for 25-35 min, then filtered, dried and crushed to 120-180 meshes to obtain a functional additive.

[0020] Further, the preparation method of the synergistic additive comprises the following steps:

[0021] B1, talc powder is ground to an average particle size of 5-8 μm, then placed in a microwave reactor and treated at a power of 400-600 W for 5-8 min, and nano-titanium dioxide particles are mixed with the talc powder at a mass ratio of 1:5-8 and stirred uniformly;

[0022] B2, the treated talc powder is immersed in a γ-methacryloxypropyltrimethoxysilane ethanol solution with a mass fraction of 3-5%, stirred and reacted at 60-70°C and 100-120 r / min for 1-3 h, and 0.5-1% of nano-cellulose is added to the reaction system;

[0023] B3, after the reaction is completed, a high-speed centrifuge is used to centrifuge at a speed of 12000-15000 r / min for 15-20 min, and the solid obtained by centrifugation is dissolved in deionized water and ultrafiltered through an ultrafiltration membrane with a molecular weight cutoff of 10000-15000 Da to obtain a high-purity concentrated product;

[0024] B4, the concentrated product is placed in a vacuum drying machine and dried at a vacuum degree of 10-20 Pa and a temperature of 60-80°C for 6-8 h to obtain a synergistic additive.

[0025] Further, the organic acid salt is a mixed system of potassium citrate and calcium acetate, and the mass ratio is 1.5-2:1.

[0026] Further, the bio-based filling material is one of attapulgite, cumengite and palygorskite.

[0027] Further, the polyhydric alcohol is a system of glycerol and ethylene glycol, and the mass ratio is 2-4:1.

[0028] Further, the bio-based slow-release agent is one of corn starch, carboxymethyl cellulose and sodium alginate.

[0029] (Three) beneficial technical effects

[0030] The natural antifreeze active ingredient of the bio-based antifreezing agent can significantly reduce the freezing point, and at the same time, the bio-based raw material is biodegradable, avoiding pollution of traditional chemical agents to soil and water. Through the bio-based slow-release agent coating process, a core-shell slow-release structure is formed, so that the antifreezing agent, organic acid salt and other components are uniformly loaded on the surface of the attapulgite filler, effectively prolonging the action period compared with the uncoated process, and ensuring long-term antifreezing effect. The potassium citrate and calcium acetate compound system cooperates with glycerol-ethylene glycol polyol to reduce the freezing point and form a protective film, reduce metal corrosion, prolong the service life of bridge and pavement steel, and realize the dual benefits of road protection and ecological restoration.

[0031] The present application adopts atomization coating, vacuum drying and other processes to ensure uniform dispersion of raw materials, good fluidity, convenient spraying construction, economic and environmental benefits, and is suitable for winter anti-icing operation of roads, airports, bridges and other scenes in cold regions. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] The bio-based environmentally friendly pavement freezing inhibitor formula components of the present application are all commercially available unless otherwise specified.

[0034] The parts used in the present application are all parts by weight;

[0035] Example 1

[0036] A bio-based environmentally friendly pavement freezing inhibitor is made from the following weight parts of raw materials:

[0037] 20 parts of bio-based antifreezing agent, 10 parts of organic acid salt, 12 parts of polyol, 10 parts of functional additive, 6 parts of synergistic additive, 5 parts of bio-based corrosion inhibitor, 15 parts of bio-based filler and 30 parts of deionized water.

[0038] The antifreeze plant is oat straw.

[0039] The organic acid salt is a mixed system of potassium citrate and calcium acetate with a mass ratio of 1.5:1.

[0040] The bio-based filler material is attapulgite.

[0041] The polyol is a glycerol-ethylene glycol system with a mass ratio of 2:1.

[0042] The bio-based slow-release agent is corn starch, and the starch is added into water to prepare a dispersion liquid with a mass fraction of 12%.

[0043] A preparation method of a bio-based environmentally-friendly pavement freezing inhibitor comprises the following steps:

[0044] S1, placing a bio-based anti-freezing agent, an organic acid salt, a polyol, a functional additive, and a synergistic additive in a high-speed blender, and mixing at a speed of 200 r / min for 10 min;

[0045] S2, uniformly spraying a bio-based slow-release agent solution on the surface of the mixed materials through an atomizing nozzle, and stirring while spraying, with a stirring speed controlled at 150 r / min and an atomizing pressure controlled at 0.2 MPa;

[0046] S3, placing a bio-based filler in a container, slowly adding the coated product and deionized water, stirring at a speed of 80 r / min for 2 h at room temperature, drying in a vacuum drying box at 60℃ and a vacuum degree of 0.08 MPa for 4 h, transferring to a pulverizer, and pulverizing to 80 mesh to obtain a bio-based environmentally-friendly pavement freezing inhibitor.

[0047] A preparation method of a bio-based anti-freezing agent comprises the following steps:

[0048] A1, placing collected anti-freezing plant samples in flowing clean water, gently washing for 5 min, laying the washed plant samples on a tray, and placing the tray in a forced air drying oven, setting the temperature to 40℃, and drying for 12 h until the water content of the samples is reduced to below 10%, and then transferring the dried plant samples to a pulverizer to pulverize into powder with a particle size of about 80 mesh;

[0049] A2, mixing the plant powder and deionized water at a ratio of 1 g:10 mL, placing the mixture in a constant temperature water bath, stirring at 60℃ for 2 h, cooling the mixture to room temperature after the extraction is completed, and then centrifuging at 4℃ and 8000 r / min for 15 min, collecting the supernatant, and obtaining an anti-freezing active ingredient solution;

[0050] A3, uniformly stirring the anti-freezing active ingredient solution with lecithin with a total mass of 0.5% and glycerol with a total mass of 10%, with a stirring speed controlled at 10000 r / min and a stirring time of 10 min, to form a uniform mixture, i.e., a bio-based anti-freezing agent.

[0051] A preparation method of a functional additive comprises the following steps:

[0052] Rice husk was placed in a 0.07 g / mL citric acid solution at a solid-liquid ratio of 0.03 g / mL, treated at 85°C and 80 r / min for 1 h, then placed in an oven at 55°C for 10 h, and ground to 150 mesh to obtain a powder; the powder was placed in deionized water at a solid-liquid ratio of 0.035 g / mL, mixed at 150 r / min for 10 min, 3% of the mass of the powder was added to the bamboo charcoal material, treated at 45°C and 55 r / min for 25 min, then filtered, dried and ground to 120 mesh to obtain a functional additive.

[0053] The preparation method of the synergistic additive comprises the following steps:

[0054] B1, talc powder was ground to an average particle size of 5-8 μm, then placed in a microwave reactor and treated at a power of 400 W for 5 min, and nano-titanium dioxide particles were mixed with the talc powder at a mass ratio of 1:5 and stirred uniformly;

[0055] B2, the treated talc powder was immersed in a 3% mass fraction of γ-methacryloxypropyltrimethoxysilane ethanol solution, stirred at 60°C and 100 r / min for 1 h, and 0.5% mass fraction of nano-cellulose was added to the reaction system;

[0056] B3, after the reaction was completed, a high-speed centrifuge was used at a speed of 12000 r / min for 15 min, and the solid obtained by centrifugation was dissolved in deionized water and ultrafiltered through an ultrafiltration membrane with a molecular weight cutoff of 10000 Da to obtain a high-purity concentrated product;

[0057] B4, the concentrated product was placed in a vacuum drying machine and dried at a vacuum degree of 10 Pa and a temperature of 60°C for 6 h to obtain a synergistic additive.

[0058] Example 2

[0059] A bio-based environmentally friendly pavement freezing inhibitor was made from the following raw materials by weight:

[0060] 25 parts of bio-based anti-freezing agent, 12 parts of organic acid salt, 15 parts of polyol, 12 parts of functional additive, 8 parts of synergistic additive, 6 parts of bio-based corrosion inhibitor, 20 parts of bio-based filler, and 35 parts of deionized water;

[0061] The anti-freezing plant is reed root.

[0062] The organic acid salt is a mixed system of potassium citrate and calcium acetate, with a mass ratio of 1.8:1.

[0063] The bio-based filler material is cumengite.

[0064] The polyol is a system of propylene glycol and ethylene glycol with a mass ratio of 3:1.

[0065] The bio-based sustained-release agent is carboxymethyl cellulose, which is added to water to prepare a solution with a mass fraction of 5%.

[0066] A method for preparing a bio-based environmentally friendly road freezing inhibitor comprises the following steps:

[0067] S1. Place the bio-based antifreeze agent, organic acid salt, polyol, functional additive, and synergistic additive in a high-speed mixer and mix at a speed of 250 r / min for 15 min;

[0068] S2. Spray the bio-based slow-release agent solution evenly on the surface of the mixed material through an atomizing nozzle, stirring while spraying, with the stirring speed controlled at 180 r / min and the atomizing pressure controlled at 0.2 MPa;

[0069] S3. Place the bio-based filler in a container, slowly add the coated product and deionized water, stir at room temperature at a speed of 90 r / min for 2.5 h, place in a vacuum drying oven, dry at 65°C and a vacuum degree of 0.08 MPa for 5 h, transfer to a grinder, and grind into 90 mesh to obtain a bio-based environmentally friendly pavement freezing inhibitor.

[0070] The preparation method of the bio-based antifreeze agent comprises the following steps:

[0071] A1. Place the collected frost-resistant plant samples in running water and gently rinse for 10 minutes. Spread the washed plant samples flat on a tray and place them in a forced-air drying oven at 45°C for 16 hours, until the moisture content of the samples drops below 10%. Transfer the dried plant samples to a grinder and grind them into a powder with a particle size of approximately 100 mesh.

[0072] A2. Mix the plant powder with deionized water at a ratio of 1 g:15 mL, place in a constant temperature water bath, and stir and extract at 70°C for 2.5 h. After the extraction, cool the mixture to room temperature and then centrifuge at 4°C and 9000 rpm for 15 min. Collect the supernatant to obtain the antifreeze active ingredient solution.

[0073] A3. The antifreeze active ingredient solution was mixed with 0.8% lecithin and 15% glycerol by weight at a stirring speed of 12,000 r / min for 10 minutes to form a uniform mixed solution, i.e., a bio-based antifreeze agent.

[0074] The preparation method of the functional additive comprises the following steps:

[0075] The rice husk is placed in a 0.1 g / mL citric acid solution at a solid-liquid ratio of 0.05 g / mL, treated at 90°C and 100 r / min for 1.5 h, then placed in an oven at 60°C for 15 h, and ground to 200 mesh to obtain a powder; the powder is placed in deionized water at a solid-liquid ratio of 0.04 g / mL, mixed at 140 r / min for 15 min, 5% of the mass of the powder is added to the bamboo charcoal material, treated at 50°C and 60 r / min for 30 min, then filtered, dried and ground to 150 mesh to obtain a functional additive.

[0076] The preparation method of the synergistic additive comprises the following steps:

[0077] B1, the talc powder is ground to an average particle size of 5-8 μm, then placed in a microwave reactor, treated at a power of 500 W for 6 min, and the nano titanium dioxide particles are mixed with the talc powder at a mass ratio of 1:6 and stirred uniformly;

[0078] B2, the treated talc powder is immersed in a 4% mass fraction of γ-methacryloxypropyltrimethoxysilane ethanol solution, stirred at 65°C and 110 r / min for 2 h, and 0.8% mass fraction of nano cellulose is added to the reaction system;

[0079] B3, after the reaction is completed, the high-speed centrifuge is used at a speed of 14000 r / min for 20 min, then the solid obtained by centrifugation is dissolved in deionized water, and ultrafiltration is performed through an ultrafiltration membrane with a molecular weight cut-off of 12000 Da to obtain a high-purity concentrated product;

[0080] B4, the concentrated product is placed in a vacuum drying machine and dried at a vacuum degree of 15 Pa and a temperature of 70°C for 7 h to obtain a synergistic additive.

[0081] Example 3

[0082] A bio-based environmentally friendly pavement freezing inhibitor is made from the following raw materials by weight:

[0083] 30 parts of bio-based anti-freezing agent, 15 parts of organic acid salt, 18 parts of polyol, 15 parts of functional additive, 12 parts of synergistic additive, 10 parts of bio-based corrosion inhibitor, 30 parts of bio-based filler and 40 parts of deionized water;

[0084] The anti-freezing plant is sea buckthorn.

[0085] The organic acid salt is a mixed system of potassium citrate and calcium acetate with a mass ratio of 2:1.

[0086] The bio-based filler material is palygorskite.

[0087] The polyhydric alcohol is a glycerol and ethylene glycol system with a mass ratio of 4:1.

[0088] The bio-based slow-release agent is sodium alginate, which is added to water to form a solution with a mass fraction of 5%.

[0089] A method for preparing a bio-based environmentally friendly pavement freezing inhibitor includes the following steps:

[0090] S1, the bio-based anti-freezing agent, organic acid salt, polyhydric alcohol, functional additive, and synergistic additive are placed in a high-speed mixer and mixed at a speed of 300 r / min for 15 min;

[0091] S2, the bio-based slow-release agent solution is uniformly sprayed on the surface of the mixed material through an atomizing nozzle, and stirring is performed while spraying, with a stirring speed controlled at 200 r / min and an atomizing pressure controlled at 0.3 MPa;

[0092] S3, the bio-based filler is placed in a container, the coated product and deionized water are slowly added, stirring is performed at a speed of 100 r / min for 3 h at room temperature, and then the product is transferred to a vacuum drying oven for drying at 70℃ under a vacuum degree of 0.09 MPa for 6 h, and then the product is transferred to a pulverizer for pulverization to 100 mesh to obtain the bio-based environmentally friendly pavement freezing inhibitor.

[0093] A method for preparing a bio-based anti-freezing agent includes the following steps:

[0094] A1, the collected anti-freezing plant sample is gently washed in flowing clean water for 10 min, the washed plant sample is then laid on a tray and placed in a forced air drying oven, with a temperature set at 50℃, and dried for 24 h until the water content of the sample is reduced to below 10%, and then the dried plant sample is transferred to a pulverizer for pulverization to a powder with a particle size of about 120 mesh;

[0095] A2, the plant powder and deionized water are mixed at a ratio of 1 g:20 mL, placed in a constant temperature water bath, stirred at 80℃ for 3 h, cooled to room temperature after extraction, and then centrifuged at 4℃ and 10000 r / min for 20 min, and the supernatant is collected to obtain an anti-freezing active ingredient solution;

[0096] A3, the anti-freezing active ingredient solution is uniformly stirred with lecithin with a total mass of 1% and glycerol with a total mass of 20%, at a stirring speed of 15000 r / min for 15 min to form a uniform mixture, which is a bio-based anti-freezing agent.

[0097] A method for preparing a bio-based anti-freezing agent includes the following steps:

[0098] The rice husk is placed in a 0.12 g / mL citric acid solution at a solid-liquid ratio of 0.06 g / mL, treated at 95℃ and 110 r / min for 2 h, then placed in an oven at 65℃ for 20 h, and ground to 250 mesh to obtain a powder; the powder is placed in deionized water at a solid-liquid ratio of 0.045 g / mL, mixed at 150 r / min for 15 min, 6% of the mass of the powder is added to the bamboo charcoal material, treated at 55℃ and 65 r / min for 35 min, then filtered, dried and ground to 180 mesh to obtain a functional additive.

[0099] The preparation method of the synergistic additive comprises the following steps:

[0100] B1, the talc powder is ground to an average particle size of 5-8 μm, then placed in a microwave reactor, treated at a power of 600 W for 8 min, the nano-titanium dioxide particles are mixed with the talc powder at a mass ratio of 1:8 and stirred uniformly;

[0101] B2, the treated talc powder is immersed in a 5% mass fraction of γ-methacryloxypropyltrimethoxysilane ethanol solution, stirred at 70℃ and 120 r / min for 3 h, and 1% mass fraction of nano-cellulose is added to the reaction system;

[0102] B3, after the reaction is completed, the high-speed centrifuge is used at a speed of 15000 r / min for 20 min, then the solid obtained by centrifugation is dissolved in deionized water, and ultrafiltration is performed through an ultrafiltration membrane with a molecular weight cutoff of 15000 Da to obtain a high-purity concentrated product;

[0103] B4, the concentrated product is placed in a vacuum drying machine and dried at a vacuum degree of 20 Pa and a temperature of 80℃ for 8 h to obtain a synergistic additive.

[0104] Comparative Example 1: the bio-based anti-freezing agent is replaced by sodium chloride and calcium chloride at a mass ratio of 3:1, and the rest of the process is the same as Example 1.

[0105] Comparative Example 2: the synergistic additive is unmodified talc powder, and the rest of the process is the same as Example 1.

[0106] Comparative Example 3: the bio-based slow-release agent is directly blended with the raw material, and the rest of the process is the same as Example 1.

[0107] Performance test:

[0108] The freezing point reduction ability (℃), 2 h snowmelt efficiency (-10℃), and effective ingredient slow-release period (d) of Examples 1-3 and Comparative Examples 1-3 are tested, and the results are shown in the following table.

[0109] Table 1

[0110] Group Freezing point depression ability (°C) 2 h snow-melting efficiency (-10 °C) Example 1 -18 85% Example 2 -18 85% Example 3 -18 85% Comparative Example 1 -10 67% Comparative Example 2 -15 78% Comparative Example 3 -18 82%

[0111] Table 2

[0112] Group Effective ingredient sustained-release period (d) Example 1 15~20 Example 2 15~20 Example 3 15~20 Comparative Example 1 10~12 Comparative Example 2 13~15 Comparative Example 3 5~7

[0113] From the table, it can be seen that Examples 1-3 can more effectively reduce the freezing point, accelerate the snow melting rate, and have better slow-release effect and longer action time compared with the comparative examples. The traditional chlorinated salt antifreeze has weaker freezing point reduction ability compared with the examples, and can pollute the environment and has no biodegradability. The unmodified talc powder cannot effectively adsorb the antifreeze components due to low surface activity and poor pore structure, resulting in short slow-release period and decreased snow melting efficiency. Without the coating process, the antifreeze components cannot be uniformly coated by the slow-release carrier, resulting in crystallization at low temperature, rapid loss of effective components, and finally affecting the durability and stability of the inhibitor.

[0114] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A bio-based environmentally friendly road freezing inhibitor, characterized in that: Made from the following raw materials in parts by weight: 20-30 parts of bio-based antifreeze, 10-15 parts of organic acid salt, 12-18 parts of polyol, 10-15 parts of functional additive, 6-12 parts of synergistic additive, 5-10 parts of bio-based corrosion inhibitor, 15-30 parts of bio-based filler and 30-40 parts of deionized water; The preparation method comprises the following steps: S1. Place the bio-based antifreeze agent, organic acid salt, polyol, functional additive, and synergistic additive in a high-speed mixer and mix at a speed of 200-300 r / min for 10-15 min; S2. Spray the bio-based slow-release agent solution evenly on the surface of the mixed material through an atomizing nozzle, stirring while spraying, with the stirring speed controlled at 150-200 r / min and the atomizing pressure controlled at 0.2-0.3 MPa; S3. Place the bio-based filler in a container, slowly add the coated product and deionized water, stir at room temperature at a speed of 80-100 r / min for 2-3 hours, place in a vacuum drying oven, dry at 60-70°C and a vacuum degree of 0.08-0.09 MPa for 4-6 hours, transfer to a grinder, and grind to 80-100 mesh to obtain a bio-based environmentally friendly pavement freezing inhibitor.

2. The bio-based environmentally friendly road freezing inhibitor according to claim 1, characterized in that: The preparation method of the bio-based antifreeze agent comprises the following steps: A1. Place the collected frost-resistant plant samples in running water and gently rinse for 5-10 minutes. Spread the washed plant samples flat on a tray and place them in a forced air drying oven at 40-50°C for 12-24 hours, until the moisture content of the samples drops below 10%. Transfer the dried plant samples to a grinder and grind them into a powder with a particle size of approximately 80-120 mesh. A2. Mix the plant powder with deionized water at a ratio of 1 g: 10-20 mL, place in a constant temperature water bath, and stir and extract at 60-80°C for 2-3 hours. After the extraction, cool the mixture to room temperature and then centrifuge at 4°C and 8000-10000 rpm for 15-20 minutes. Collect the supernatant to obtain the antifreeze active ingredient solution. A3. The antifreeze active ingredient solution is mixed with 0.5-1% by weight of lecithin and 10-20% by weight of glycerol. The mixture is stirred at a speed of 10,000-15,000 r / min for 10-15 minutes to form a uniform mixed solution, i.e., the bio-based antifreeze agent.

3. The bio-based environmentally friendly road freezing inhibitor according to claim 2, characterized in that: The frost-resistant plant is one of oat straw, reed root and sea buckthorn.

4. The bio-based environmentally friendly road freezing inhibitor according to claim 1, characterized in that: The preparation method of the functional additive comprises the following steps: Rice husk was placed in a 0.07-0.12 g / mL citric acid solution at a solid-liquid ratio of 0.03-0.06 g / mL, treated at 85-95°C and 80-110 r / min for 1-2 h, then placed in an oven at 55-65°C for 10-20 h and crushed to 150-250 mesh to obtain a powder. The powder was placed in deionized water at a solid-liquid ratio of 0.035-0.045 g / mL, mixed at 130-150 r / min for 10-15 min, and bamboo charcoal material (3-6% by weight of the powder) was added. The mixture was treated at 45-55°C and 55-65 r / min for 25-35 min. After filtration, the mixture was dried and crushed to 120-180 mesh to obtain a functional additive.

5. The bio-based environmentally friendly road freezing inhibitor according to claim 1, characterized in that: The preparation method of the synergist comprises the following steps: B1. Grind talc powder to an average particle size of 5-8 μm, then place it in a microwave reactor at a power of 400-600 W for 5-8 min. Mix nano-titanium dioxide particles with talc powder at a mass ratio of 1:5-8 and stir until uniform. B2. Immerse the treated talc in a 3-5% (mass fraction) γ-methacryloxypropyltrimethoxysilane ethanol solution, stir at 60-70°C and 100-120 rpm for 1-3 h, and add 0.5-1% (mass fraction) nanocellulose to the reaction system. B3. After the reaction is completed, the product is centrifuged at 12,000 to 15,000 r / min for 15 to 20 min using a high-speed centrifuge. The solid obtained by centrifugation is then dissolved in deionized water and ultrafiltered through an ultrafiltration membrane with a molecular weight cut-off of 10,000 to 15,000 Da to obtain a high-purity concentrated product. B4. Place the concentrated product in a vacuum dryer and dry it at a vacuum degree of 10-20 Pa and a temperature of 60-80°C for 6-8 hours to obtain a synergistic auxiliary agent.

6. The bio-based environmentally friendly road freezing inhibitor according to claim 1, characterized in that: The organic acid salt is a mixed system of potassium citrate and calcium acetate with a mass ratio of 1.5 to 2:

1.

7. The bio-based environmentally friendly road freezing inhibitor according to claim 1, characterized in that: The bio-based filling material is one of attapulgite, rectorite and palygorskite.

8. The bio-based environmentally friendly road freezing inhibitor according to claim 1, characterized in that: The polyol is a system of propylene glycol and ethylene glycol with a mass ratio of 2 to 4:

1.

9. The bio-based environmentally friendly road freezing inhibitor according to claim 1, characterized in that: The bio-based sustained-release agent is one of corn starch, carboxymethyl cellulose, and sodium alginate.