CN106833523B - Anti frozen liquid for bituminous paving and preparation method thereof - Google Patents

Abstract

The invention discloses a kind of anti frozen liquids for bituminous paving, are made of the raw material of following parts by weight：10~20 parts of potassium formate, 5~10 parts of sodium chloride, 5~10 parts of ethylene glycol, 1~3 part of dipotassium hydrogen phosphate, 1~2 part of croscarmellose sodium, 0.1~0.5 part of sodium lignin sulfonate, 0.1~0.5 part of EDETATE SODIUM, 0.02~0.05 part of acrylate copolymer, 0.1~0.5 part of potassium hydroxide, 0.1~0.2 part of dimethyl silicone polymer, 60~80 parts of water.The present invention is less than 30 DEG C for the freezing point of the anti frozen liquid of bituminous paving; it can be good at carrying out anti-frost protection to bituminous paving; and be largely the organic material that can be degraded by microorganisms in material used, the content of inorganic salts is low, smaller to the harm brought of bituminous paving and environment.

Description

Antifreeze liquid for asphalt pavement and preparation method thereof

technical field

The invention relates to the field of road pavement antifreeze and deicing technology, in particular to an antifreeze liquid for asphalt pavement and a preparation method thereof.

Background technique

Transportation is the artery of the national economy and plays an inestimable role in the development of the entire national economy. However, snow and ice in winter seriously affect the efficiency of road transportation and traffic safety, and sometimes even lead to closed traffic.

Traditional methods of removing snow on asphalt roads mainly use passive deicing techniques such as manual, mechanical removal or spraying snow-melting salt, which is not only labor-intensive and the effect is lagging behind, but also snow-melting salt also causes serious damage to the road structure, vegetation and ecological environment. Active snow and ice removal technology generally adds antifreeze and deicing materials to the asphalt mixture. However, since this material permanently exists on the road surface, it is easy to evaporate quickly and fail when the temperature is high, resulting in the antifreeze function of the asphalt pavement. weakened, and the duration of action is shortened.

Contents of the invention

The invention provides an antifreeze liquid for asphalt pavement and a preparation method thereof, which solves the problem that the antifreeze material of asphalt pavement seriously damages the road and the ecological environment in the existing passive snow and ice removal technology, and actively removes ice and snow In technology, the antifreeze material of asphalt pavement is easy to fail at high temperature and has a short duration.

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

Design an antifreeze solution for asphalt pavement, which is made of the following raw materials in parts by weight: 10-20 parts of potassium formate, 5-10 parts of sodium chloride, 5-10 parts of ethylene glycol, and 1-20 parts of dipotassium hydrogen phosphate 3 parts, 1-2 parts of croscarmellose sodium, 0.1-0.5 parts of sodium lignosulfonate, 0.1-0.5 parts of disodium EDTA, 0.02-0.05 parts of acrylic acid polymer, 0.1-0.5 parts of potassium hydroxide, 0.1-0.2 parts of polydimethylsiloxane, 60-80 parts of water.

In the above technical solution, salt sodium chloride is used as an inorganic snow-melting agent, which has a certain anti-freeze and anti-icing protection ability for asphalt roads, but it has a certain corrosion effect on large-scale public infrastructure, and it is easy to cause damage to the ecological environment. Here The amount of sodium chloride is less; at the same time, dipotassium hydrogen phosphate as a corrosion inhibitor is added to reduce and slow down this damage, and dipotassium hydrogen phosphate contains the nutrients phosphorus and potassium required for plant growth, which are important in frost resistance. The liquid flows to both sides of the road with rainwater or snowmelt, and also provides nutrients for the green plants on the roadside.

Potassium formate is an organic deicing agent, which basically has no corrosion damage to asphalt roads, but its freezing point is high, so it is not easy to use in low temperature areas; adding ethylene glycol as antifreeze, on the one hand, can synergize with sodium chloride and sodium formate It has a better antifreeze effect. On the other hand, as an organic liquid with a certain viscosity, it can be mixed with sodium chloride and sodium formate to play a slow-release role. Adding a small amount of acrylic polymer can increase the viscosity, so that the active ingredients can be released slowly, further increasing the slow release of antifreeze; adding potassium hydroxide to the formula to neutralize the acidity of the acrylic polymer, and adding disodium EDTA To reduce the viscosity and keep its viscosity in an appropriate range.

Croscarmellose sodium has certain water retention and slow-release properties, which can slowly release the active ingredients in the product and produce long-term effects; sodium lignosulfonate is an anionic surfactant, which can make the active ingredients in the formula Inorganic matter and organic matter are evenly mixed together; polydimethylsiloxane is a kind of defoamer, which can reduce the surface tension of the product, making it easier to penetrate into the asphalt during use, and have a long-term effect.

Preferably, it is made from the following raw materials in parts by weight: 10 parts of potassium formate, 5 parts of sodium chloride, 10 parts of ethylene glycol, 1 part of dipotassium hydrogen phosphate, 2 parts of croscarmellose sodium, lignin sulfonate 0.5 parts of sodium phosphate, 0.1 parts of disodium EDTA, 0.02 parts of acrylic acid polymer, 0.2 parts of potassium hydroxide, 0.2 parts of polydimethylsiloxane, and 60 parts of water.

Preferably, it is made from the following raw materials in parts by weight: 20 parts of potassium formate, 8 parts of sodium chloride, 5 parts of ethylene glycol, 2 parts of dipotassium hydrogen phosphate, 1 part of croscarmellose sodium, lignin sulfonate 0.3 parts of sodium phosphate, 0.3 parts of disodium EDTA, 0.05 parts of acrylic acid polymer, 0.5 parts of potassium hydroxide, 0.15 parts of polydimethylsiloxane, and 80 parts of water.

Preferably, it is made from the following raw materials in parts by weight: 15 parts of potassium formate, 10 parts of sodium chloride, 8 parts of ethylene glycol, 3 parts of dipotassium hydrogen phosphate, 2 parts of croscarmellose sodium, lignin sulfonate 0.1 part of sodium phosphate, 0.5 part of disodium EDTA, 0.03 part of acrylic acid polymer, 0.3 part of potassium hydroxide, 0.1 part of polydimethylsiloxane, and 70 parts of water.

The present invention also relates to the preparation method of the above-mentioned antifreeze liquid for asphalt pavement, comprising the following steps:

(1) Weigh each raw material according to the following parts by weight: 10-20 parts of potassium formate, 5-10 parts of sodium chloride, 5-10 parts of ethylene glycol, 1-3 parts of dipotassium hydrogen phosphate, cross-linked carboxymethyl fiber 1-2 parts of sodium sulfonate, 0.1-0.5 parts of sodium lignosulfonate, 0.1-0.5 parts of disodium EDTA, 0.02-0.05 parts of acrylic acid polymer, 0.1-0.5 parts of potassium hydroxide, 0.1-0.5 parts of polydimethylsiloxane 0.2 parts, 60-80 parts of water;

(2) Soak the acrylic acid polymer in the water weighed in step (1), let it stand for 1-2 hours, and then stir at a speed of 1000r/min for 30-60 minutes to obtain glue;

(3) At a stirring speed of 500r/min, add the ethylene glycol to the glue obtained in step (2), stir for 10 to 30 minutes, then add the potassium hydroxide, and wait until the potassium hydroxide is completely dissolved. Add disodium EDTA, and stir for 10-30 minutes after the disodium EDTA is completely dissolved to obtain a mixture of alcohol and water;

(4) At a stirring speed of 100r/min, add the potassium formate and sodium chloride to the alcohol-water mixture obtained in step (3), and stir for 10 to 30 minutes after the potassium formate and sodium chloride are completely dissolved , to obtain alcohol-salt mixture;

(5) Add dipotassium hydrogen phosphate, croscarmellose sodium, sodium lignin sulfonate and polydimethylsiloxane to the alcohol-salt mixture obtained in step (4), and then use 100r/min Stir at a speed of 30-60 minutes to obtain the antifreeze liquid for asphalt pavement.

The beneficial effects of the present invention are:

1. The present invention is used for the antifreeze liquid of asphalt pavement, adopts inorganic freezing point depressant and organic freezing point depressant to combine antifreeze and antiicing, antifreezing and antiicing effect is better than simple organic antifreezing agent, and with respect to inorganic antifreezing agent As for the refrigerant, the damage to the asphalt road is small, and the harm to the environment is also small.

2. The freezing point of the antifreeze liquid used for asphalt pavement of the present invention is less than -30°C, which can effectively protect asphalt pavement from freezing, and most of the materials used are organic materials that can be degraded by microorganisms, and the content of inorganic salts Low, less harm to asphalt roads and the environment.

3. The antifreeze liquid used in the asphalt pavement of the present invention only needs to be sprayed when the temperature drops and the road surface is easy to freeze, which avoids the risk of high temperature failure and solves the problem of adding antifreeze and deicing materials to the asphalt mixture in the prior art The problem that it is easy to fail under high temperature conditions, and because of the addition of ethylene glycol, acrylic acid polymer and cross-linked carmellose sodium, the active ingredients in the product can be released slowly and the effect is long-lasting.

Detailed ways

The specific implementation of the present invention will be described below in conjunction with the examples, but the following examples are only used to describe the present invention in detail, and do not limit the scope of the present invention in any way. Unless otherwise specified, the instruments and equipment involved in the following examples are conventional instruments and equipment; the involved industrial raw materials are commercially available conventional industrial raw materials unless otherwise specified.

Embodiment 1: A kind of antifreeze liquid for asphalt pavement is made of the following raw materials in parts by weight: 10 parts of potassium formate, 5 parts of sodium chloride, 10 parts of ethylene glycol, 1 part of dipotassium hydrogen phosphate, cross-linked 2 parts of sodium carboxymethyl cellulose, 0.5 parts of sodium lignosulfonate, 0.1 part of disodium EDTA, 0.02 parts of acrylic acid polymer, 0.2 parts of potassium hydroxide, 0.2 parts of polydimethylsiloxane, and 60 parts of water.

Its preparation method comprises the following steps:

(1) Weigh each raw material according to the following parts by weight: 10 parts of potassium formate, 5 parts of sodium chloride, 10 parts of ethylene glycol, 1 part of dipotassium hydrogen phosphate, 2 parts of croscarmellose sodium, lignin sulfonate 0.5 parts of sodium phosphate, 0.1 parts of disodium EDTA, 0.02 parts of acrylic acid polymer, 0.2 parts of potassium hydroxide, 0.2 parts of polydimethylsiloxane, and 60 parts of water.

(2) Soak the acrylic acid polymer in the water weighed in step (1), let it stand for 1 hour, and then stir it at a speed of 1000 r/min for 30 minutes to obtain a glue solution.

(3) At a stirring speed of 500r/min, add the ethylene glycol to the glue obtained in step (2), stir for 10 minutes, then add the potassium hydroxide, and then add EDTA after the potassium hydroxide is completely dissolved Disodium, after the disodium EDTA is completely dissolved, stir for 30 minutes to obtain a mixture of alcohol and water.

(4) At a stirring speed of 100r/min, add the potassium formate and sodium chloride to the alcohol-water mixture obtained in step (3), and stir for 30 minutes after the potassium formate and sodium chloride are completely dissolved to obtain Alcohol, salt mixture.

(5) Add dipotassium hydrogen phosphate, croscarmellose sodium, sodium lignin sulfonate and polydimethylsiloxane to the alcohol-salt mixture obtained in step (4), and then use 100r/min Stir at a speed of 30 minutes to obtain the antifreeze solution for asphalt pavement.

Embodiment 2: a kind of antifreeze liquid for asphalt pavement is made of the following raw materials in parts by weight: 20 parts of potassium formate, 8 parts of sodium chloride, 5 parts of ethylene glycol, 2 parts of dipotassium hydrogen phosphate, 1 part of sodium carboxymethylcellulose, 0.3 parts of sodium lignosulfonate, 0.3 parts of disodium EDTA, 0.05 parts of acrylic acid polymer, 0.5 parts of potassium hydroxide, 0.15 parts of polydimethylsiloxane, and 80 parts of water.

Its preparation method comprises the following steps:

(1) Weigh each raw material according to the following parts by weight: 20 parts of potassium formate, 8 parts of sodium chloride, 5 parts of ethylene glycol, 2 parts of dipotassium hydrogen phosphate, 1 part of croscarmellose sodium, lignin sulfonate 0.3 parts of sodium phosphate, 0.3 parts of disodium EDTA, 0.05 parts of acrylic acid polymer, 0.5 parts of potassium hydroxide, 0.15 parts of polydimethylsiloxane, and 80 parts of water.

(2) Soak the acrylic acid polymer in the water weighed in step (1), let it stand for 2 hours, and then stir it at a speed of 1000r/min for 60 minutes to obtain a glue solution.

(3) At a stirring speed of 500r/min, add the ethylene glycol to the glue obtained in step (2), stir for 30 minutes, then add the potassium hydroxide, and then add EDTA after the potassium hydroxide is completely dissolved Disodium, after the disodium EDTA is completely dissolved, stir for 20 minutes to obtain a mixture of alcohol and water.

(4) At a stirring speed of 100r/min, add the potassium formate and sodium chloride to the alcohol-water mixture obtained in step (3), and stir for 20 minutes after the potassium formate and sodium chloride are completely dissolved to obtain Alcohol, salt mixture.

(5) Add dipotassium hydrogen phosphate, croscarmellose sodium, sodium lignin sulfonate and polydimethylsiloxane to the alcohol-salt mixture obtained in step (4), and then use 100r/min Stir at a speed of 40 min to obtain the antifreeze solution for asphalt pavement.

Embodiment 3: a kind of antifreeze liquid that is used for asphalt pavement, is made of the raw material of following parts by weight: 15 parts of potassium formate, 10 parts of sodium chloride, 8 parts of ethylene glycol, 3 parts of dipotassium hydrogen phosphate, cross-linked 2 parts of sodium carboxymethyl cellulose, 0.1 part of sodium lignosulfonate, 0.5 part of disodium EDTA, 0.03 part of acrylic acid polymer, 0.3 part of potassium hydroxide, 0.1 part of polydimethylsiloxane, and 70 parts of water.

Its preparation method comprises the following steps:

(1) Weigh each raw material according to the following parts by weight: 15 parts of potassium formate, 10 parts of sodium chloride, 8 parts of ethylene glycol, 3 parts of dipotassium hydrogen phosphate, 2 parts of croscarmellose sodium, lignin sulfonate 0.1 part of sodium phosphate, 0.5 part of disodium EDTA, 0.03 part of acrylic acid polymer, 0.3 part of potassium hydroxide, 0.1 part of polydimethylsiloxane, and 70 parts of water.

(2) Soak the acrylic acid polymer in the water weighed in step (1), let it stand for 1.5h, and then stir at a speed of 1000r/min for 50min to obtain a glue solution.

(3) At a stirring speed of 500r/min, add the ethylene glycol to the glue obtained in step (2), stir for 20 minutes, then add the potassium hydroxide, and then add EDTA after the potassium hydroxide is completely dissolved Disodium, after the disodium EDTA is completely dissolved, stir for 10 minutes to obtain a mixture of alcohol and water.

(4) At a stirring speed of 100r/min, add the potassium formate and sodium chloride to the alcohol-water mixture obtained in step (3), and stir for 10 minutes after the potassium formate and sodium chloride are completely dissolved to obtain Alcohol, salt mixture;

(5) Add dipotassium hydrogen phosphate, croscarmellose sodium, sodium lignin sulfonate and polydimethylsiloxane to the alcohol-salt mixture obtained in step (4), and then use 100r/min Stir at a speed of 60 min to obtain the antifreeze solution for asphalt pavement.

The antifreeze liquid used for asphalt pavement prepared in Example 1-3 has a good antifreeze effect on asphalt pavement, and the various performances of the antifreeze liquid used for asphalt pavement prepared in Example 1-3 are tested The parameters and results are shown in Table 1 below, and the test results of antifreeze performance of asphalt mixture before and after spraying antifreeze are shown in Table 2 below.

As can be seen from Table 1, the freezing point of the antifreeze liquid for asphalt pavement prepared in Examples 1-3 is lower than -30°C, which is suitable for antifreezing asphalt pavement in winter in most areas; the viscosity is about 450mpa.s, When spraying on the asphalt pavement, on the one hand, it will not cause traffic accidents due to the decrease of road friction due to excessive viscosity, and on the other hand, it will slow down the fluidity of the antifreeze so that it can slowly penetrate into the asphalt pavement itself. In the pores, a protective layer is formed; the pH value is maintained at neutral, which will not cause damage to the asphalt pavement and the surrounding environment; the surface tension is small, around 30mN/m, which can promote the penetration of antifreeze into the surface of the asphalt pavement.

It can be seen from Table 2 that the low-temperature bending failure strain of the asphalt mixture sprayed with antifreeze fluid is much greater than that of the asphalt mixture without antifreeze fluid sprayed, and meets the "Technical Specifications for Highway Asphalt Pavement Construction" JTGF40-2004 The antifreeze performance of asphalt mixture has been greatly improved after spraying antifreeze.

In actual use, it can be diluted 10 to 100 times with water according to actual needs, and then spray the asphalt pavement with a sprayer to prevent the asphalt pavement from freezing. The specific working principle is as follows:

When the air temperature is lower than 0°C, the antifreeze solution of the present invention is sprayed on the asphalt pavement. Because a small amount of acrylic acid polymer is added to the antifreeze solution of the present invention, it has a certain viscosity and poor fluidity. A large number of pores, so it will not gather and flow on the asphalt road, but slowly penetrate into a certain depth of the surface of the asphalt pavement with the pores to form a protective layer. When it snows, the ice and snow on the road contact with the protective layer to protect The inorganic and organic freezing point depressants in the layer come into contact with ice and snow and quickly melt it into snow water, and the freezing point depressants that penetrate into the deep layer of the asphalt pavement will also gradually move upward with the change of concentration difference and be released into the snow water. As the concentration of the freezing point depression machine in the snowwater increases, the liquid-phase vapor pressure of the water decreases, while the solid-state vapor pressure of the ice remains unchanged. In order to achieve the equilibrium state of the solid-liquid vapor pressure of the ice-water mixture, more and more ice begins to melt, thus It can prevent and delay the freezing of asphalt pavement in winter. When the snowfall is too heavy and the sprayed antifreeze is not enough to melt all the ice and snow on the road surface, you can directly spray the antifreeze on the ice and snow to remove the ice and snow.

The present invention is used in the antifreeze liquid for asphalt pavement, adding inorganic salt sodium chloride as a deicing agent, which has certain antifreeze and anti-icing protection ability for asphalt roads, and the raw materials are easy to obtain and low in price, but it is not suitable for large-scale public infrastructure The corrosion and the destruction of ecological environment are very serious, so the consumption of sodium chloride is less among the present invention. At the same time, the corrosion inhibitor dipotassium hydrogen phosphate is added to reduce and slow down this damage, and dipotassium hydrogen phosphate contains the nutrients phosphorus and potassium needed for plant growth. When the antifreeze is washed away by rain or snowmelt, it enters both sides of the road When it is used, it will not cause damage to the ecological environment, and it will become a fertilizer for roadside greening plants. Potassium formate is a kind of organic deicing agent, basically does not have corrosion damage to asphalt road, but because its freezing point is higher, it is difficult to use in the low temperature area, greatly limits its scope of application and region; and the present invention adds ethylene glycol as Antifreeze, on the one hand, can work synergistically with sodium chloride and sodium formate to achieve a better antifreeze effect; on the other hand, as an organic liquid with a certain viscosity, it is mixed with sodium chloride and sodium formate in the system Together, it acts as a slow release. In order to strengthen the sustained release, the present invention also adds a small amount of acrylic acid polymer to increase the viscosity, so that the active ingredients can be released slowly. However, the aqueous solution of acrylic acid polymer is acidic, so in order to maintain the neutral pH of the final product, potassium hydroxide is added to the formula to neutralize the acrylic polymer, but after the reaction of the aqueous solution of acrylic polymer and potassium hydroxide The viscosity of the system will suddenly increase, and if the product viscosity is too high, it will reduce the friction of the asphalt road when it is sprayed on the asphalt road, which will easily lead to accidents. Therefore, disodium EDTA is added in the present invention to reduce the viscosity and make it more viscous. stay within a suitable range. Croscarmellose sodium has certain water retention and slow-release properties, which can slowly release the active ingredients in the product and produce long-term effects; sodium lignosulfonate is an anionic surfactant, which can make the active ingredients in the formula Inorganic matter and organic matter are evenly mixed together; polydimethylsiloxane is a kind of defoamer, which can reduce the surface tension of the product, making it easier to penetrate into the asphalt during use, and have a long-term effect.

The antifreeze liquid for asphalt pavement of the present invention combines inorganic freezing point depressants and organic freezing point depressants to prevent freezing and deicing, not only has a good antifreezing and deicing effect, but also overcomes the corrosion of inorganic freezing point depressants on the road surface, The shortcoming of environmental pollution overcomes the shortcoming of expensive organic freezing point binders.

While preferred embodiments of the invention have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. In this way, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, it is also intended to include these modifications and variations.

Claims (5)

1. An antifreeze liquid for asphalt pavement is characterized in that it is made of the following raw materials in parts by weight: 10 to 20 parts of potassium formate, 5 to 10 parts of sodium chloride, 5 to 10 parts of ethylene glycol, phosphoric acid 1-3 parts of dipotassium hydrogen, 1-2 parts of croscarmellose sodium, 0.1-0.5 parts of sodium lignosulfonate, 0.1-0.5 parts of disodium EDTA, 0.02-0.05 parts of acrylic acid polymer, potassium hydroxide 0.1-0.5 parts, 0.1-0.2 parts of polydimethylsiloxane, 60-80 parts of water. 2. The antifreeze liquid for asphalt pavement according to claim 1, characterized in that it is made of the following raw materials in parts by weight: 10 parts of potassium formate, 5 parts of sodium chloride, 10 parts of ethylene glycol, hydrogen phosphate 1 part of dipotassium, 2 parts of croscarmellose sodium, 0.5 part of sodium lignosulfonate, 0.1 part of disodium EDTA, 0.02 part of acrylic acid polymer, 0.2 part of potassium hydroxide, 0.2 part of polydimethylsiloxane part, 60 parts of water. 3. The antifreeze liquid for asphalt pavement according to claim 1, characterized in that it is made of the following raw materials in parts by weight: 20 parts of potassium formate, 8 parts of sodium chloride, 5 parts of ethylene glycol, hydrogen phosphate 2 parts of dipotassium, 1 part of croscarmellose sodium, 0.3 parts of sodium lignosulfonate, 0.3 parts of disodium EDTA, 0.05 parts of acrylic acid polymer, 0.5 parts of potassium hydroxide, 0.15 parts of polydimethylsiloxane part, 80 parts of water. 4. The antifreeze liquid for asphalt pavement according to claim 1, characterized in that it is made of the following raw materials in parts by weight: 15 parts of potassium formate, 10 parts of sodium chloride, 8 parts of ethylene glycol, hydrogen phosphate Dipotassium 3 parts, croscarmellose sodium 2 parts, sodium lignosulfonate 0.1 part, disodium EDTA 0.5 part, acrylic acid polymer 0.03 part, potassium hydroxide 0.3 part, polydimethylsiloxane 0.1 part parts, 70 parts of water. 5. a preparation method for the antifreeze liquid of asphalt pavement as claimed in claim 1, is characterized in that, comprises the following steps: (1) Weigh each raw material according to the following parts by weight: 10-20 parts of potassium formate, 5-10 parts of sodium chloride, 5-10 parts of ethylene glycol, 1-3 parts of dipotassium hydrogen phosphate, cross-linked carboxymethyl fiber 1-2 parts of sodium sulfonate, 0.1-0.5 parts of sodium lignosulfonate, 0.1-0.5 parts of disodium EDTA, 0.02-0.05 parts of acrylic acid polymer, 0.1-0.5 parts of potassium hydroxide, 0.1-0.5 parts of polydimethylsiloxane 0.2 parts, 60-80 parts of water; (2) Soak the acrylic acid polymer in the water weighed in step (1), let it stand for 1-2 hours, and then stir at a speed of 1000r/min for 30-60 minutes to obtain glue; (3) At a stirring speed of 500r/min, add the ethylene glycol to the glue obtained in step (2), stir for 10 to 30 minutes, then add the potassium hydroxide, and wait until the potassium hydroxide is completely dissolved. Add disodium EDTA, and stir for 10-30 minutes after the disodium EDTA is completely dissolved to obtain a mixture of alcohol and water; (4) At a stirring speed of 100r/min, add the potassium formate and sodium chloride to the alcohol-water mixture obtained in step (3), and stir for 10 to 30 minutes after the potassium formate and sodium chloride are completely dissolved , to obtain alcohol-salt mixture; (5) Add dipotassium hydrogen phosphate, croscarmellose sodium, sodium lignin sulfonate and polydimethylsiloxane to the alcohol-salt mixture obtained in step (4), and then use 100r/min Stir at a speed of 30-60 minutes to obtain the antifreeze liquid for asphalt pavement.