KR102676137B1 - Pavement anti-freezing composition and manufacturing method thereof - Google Patents

Abstract

The present invention relates to an eco-friendly anti-icing composition added to anti-slip and other functional paints applied to asphalt or concrete road surfaces and a manufacturing method thereof. The manufacturing method includes sodium acetate, potassium acetate, and formic acid. preparing an anti-icing solution by dissolving an anti-icing agent consisting of at least one of calcium (calcium formate) and calcium magnesium acetate (CMA) in water; Adding and mixing porous particle powder into the anti-icing solution and allowing the anti-icing solution to be absorbed into the porous particle powder; manufacturing a porous anti-icing powder by removing the porous particle powder from the anti-icing solution and drying it; coating the porous anti-icing powder with oil or a water repellent; Drying the coated porous anti-icing powder; and pulverizing the dried porous anti-icing powder. According to this, there is no concern about soil contamination or metal corrosion, and the anti-icing function can be continuously exercised.

Description

Anti-icing composition for road pavement and method of manufacturing the same {PAVEMENT ANTI-FREEZING COMPOSITION AND MANUFACTURING METHOD THEREOF}

The present invention relates to an anti-icing composition added to anti-slip and other functional paints applied to asphalt or concrete road surfaces. More specifically, it relates to an anti-icing composition that is environmentally friendly and has excellent durability and a method of manufacturing the same.

Freezing of road surfaces caused by low winter temperatures, snowfall, and black ice poses a threat to the safety of road users. Additionally, the economic losses resulting from this are enormous.

Currently, in Korea, the preliminary spraying method, which sprays snow remover in advance when snowfall is expected, and the main spraying method, which sprays snow remover when snowfall is expected, are mainly implemented. However, there is a problem with this method that it is difficult to properly respond to icing on the road in unpredictable conditions caused by sudden snowfall and temperature drops.

Therefore, a snow removal plan that can actively respond to these unpredictable environments and various environmental changes with one construction was required. As part of such a plan, an anti-icing agent is added to the asphalt mixture to induce a decrease in the freezing point of the road surface to prevent icing. Some prevention methods have been developed.

However, there was a problem that this method could not be applied to already constructed asphalt or concrete.

Moreover, salt (NaCl) and calcium chloride (CaCl2) are the most commonly used existing snow removers and road anti-icing agents, and the chlorine (Cl) component contained in both is a major cause of metal corrosion and road damage. It is also pointed out that it is due to the chlorine content, so water dissolved in existing snow removers can cause corrosion of vehicles, formation of road potholes, and soil pollution.

Meanwhile, the use of eco-friendly snow removal agents that complement the shortcomings of existing anti-icing agents is being encouraged, but the problem is cost. This is because eco-friendly snow removers add additional ingredients to the existing calcium chloride, making them at least 1.5 to 3 times more expensive. In addition, when such anti-icing agents are sprayed directly on the road, temporary effects can be obtained, but there is a disadvantage in that they are easily lost or lost depending on the environment.

[Prior art literature]

Patent Registration No. 10-2138777 (2020.07.29.)

Patent Registration No. 10-2496186 (2023.02.06.)

Patent Registration No. 10-1885813 (2018.09.06.)

Patent Registration No. 10-2592562 (2023.10.24.)

Therefore, the purpose of the present invention is to provide an anti-freezing composition and a method of manufacturing the same that can continuously exert the anti-icing function without fear of soil contamination or metal corrosion.

In order to achieve the above object, the present invention relates to a method for producing an anti-icing composition for road pavement, comprising sodium acetate, potassium acetate, calcium formate, and calcium magnesium acetate (CMA). preparing an anti-icing solution by dissolving at least one of the following: acetate) in water; Adding and mixing porous particle powder into the anti-icing solution and allowing the anti-icing solution to be absorbed into the porous particle powder; manufacturing a porous anti-icing powder by removing the porous particle powder from the anti-icing solution and drying it; coating the porous anti-icing powder with oil or a water repellent; Drying the coated porous anti-icing powder; and grinding the dried porous anti-icing powder.

In addition, in order to achieve the above object, the present invention relates to a method for producing an anti-icing composition for road pavement, including sodium acetate, potassium acetate, calcium formate, and calcium magnesium acetate (CMA: Dissolving an anti-icing agent consisting of two or more of Calcium magnesium acetate in water to prepare an anti-icing solution; Adding and mixing a sodium alginate solution to the anti-icing solution to precipitate porous calcium alginate powder containing the anti-icing solution; Manufacturing a porous anti-icing powder by removing the porous calcium alginate powder from the anti-icing solution and drying it; and grinding the porous anti-icing powder.

In the above manufacturing methods, the anti-icing agent solution may be prepared by dissolving saccharides together with the anti-icing agent in the water.

Meanwhile, in order to achieve the above object, the present invention provides an anti-icing composition for road pavement manufactured by the above manufacturing method.

As described above, according to the anti-icing composition and its manufacturing method according to the present invention, there is no risk of soil contamination or metal corrosion by using eco-friendly ingredients to prevent freezing, and it does not only exert a temporary effect after construction on the road, but also provides a sustained-release function. Through this, continuous release of active ingredients is possible.

1 is a flowchart illustrating a method of manufacturing an anti-icing composition for road pavement according to a first embodiment of the present invention;
Figure 2 is a flowchart illustrating a method of manufacturing an anti-icing composition for road pavement according to a second embodiment of the present invention;
Figure 3 is a composition table of anti-icing compositions for road pavement manufactured based on the manufacturing method of Figures 1 and 2;
Figure 4 is a data table testing the metal corrosion properties of the anti-icing compositions for road pavement of Figure 3;
FIGS. 5A and 5B are graphs showing the results of an adhesion test to ice of paints mixed with some examples of the anti-icing compositions for road pavement of FIG. 3;
Figure 6 is a table illustrating mixing examples of applying the anti-icing composition for road pavement of Figure 3 to anti-slip paint for road pavement.

1. Anti-freezing composition

(1) Anti-icing agent

Among various anti-icing materials, the present invention uses only eco-friendly materials that are free from soil contamination and vehicle corrosion. Such eco-friendly anti-icing agents include sodium acetate, potassium acetate, calcium formate, and calcium magnesium acetate (CMA).

In the case of chloride, which is commonly used, the anti-icing effect is very excellent, but soil contamination and corrosiveness to metals are problems, so such chloride-based anti-icing agents were excluded.

The solubility of sodium acetate in water is somewhat high at about 760g (25 degrees) per 1000g of water. Calcium formate has a solubility of about 160g (20 degrees) per 1000g of water. In this way, the raw materials that each exert anti-icing effects have different solubilities in water.

Therefore, if the above-mentioned sodium acetate is contained in anti-slip paint for road pavement and used as is, it is easily eluted by environments such as rain and snow, so even though the initial performance is very good, there is a risk that the performance may decrease or the lifespan may be shortened over time. there is. In addition, in environments such as the rainy season in summer, anti-icing components are leached and lost in advance, so the anti-icing function may be reduced in the cold winter. In order to prevent and improve such problems, it is intended to provide an environment in which at least part of the anti-freezing ingredient can be absorbed into porous particles and slowly released.

(2) Porous particle powder

As mentioned above, the active ingredient for preventing freezing has an immediate efficacy effect, but it can only be applied to the road if it is mixed with a polymer resin and has a continuous efficacy effect against snow, rain and moisture after being applied to the road. In order to achieve such efficacy and effects, the present invention sought to overcome the above-mentioned problems by using a method to control the dissolution rate in water by absorbing and adsorbing the active ingredient into a porous material. As such porous materials, zeolite, silica, carbon, red clay, volcanic stone, etc. can be used.

(3) Sugars

In addition, the present invention aims to manufacture an eco-friendly anti-icing agent that can provide effective and continuous performance by maximizing the anti-icing effect by using the above-mentioned environmentally friendly anti-icing agent together with saccharides that retard the growth of ice crystals.

In general, snow removers exert snow removal action largely based on the principles of heat of dissolution, deliquescence, hygroscopicity, and freezing point depression. Heat of dissolution refers to the phenomenon of snow melting due to an exothermic reaction that occurs when a snow remover dissolves in water. Deliquescentness and hygroscopicity refer to the property of anti-icing agents such as calcium chloride to absorb water, that is, the property of absorbing moisture and maintaining an aqueous solution state (deliquescent-hygroscopicity). During this process, the substance is accompanied by an exothermic reaction, so the generated heat plays a role in melting the surrounding snow and ice. For example, in the case of sodium chloride, water molecules come together to form a tight bond. As sodium chloride dissolves in water, sodium and chlorine ions interfere with the bond between water molecules, causing snow and ice to melt. In addition, the working principle of anti-icing agents is to lower the freezing point so that the snow melts rather than freezes.

In addition, the present invention can use various sugars to prevent the crystallinity that occurs when water freezes at low temperatures and to delay the growth of ice. In the case of sugars, various types of sugars such as monosaccharides and polysaccharides can be used, which can inhibit the growth of crystals that occur during freezing.

In particular, trehalose is a natural disaccharide that is non-circulating and manufactured using the latest fermentation technology using starch as a raw material. Trehalose is a sugar that exists widely in the natural world, including plants and microorganisms, and is one of the sugars that humans have consumed as food for a long time. Trehalose is known to have excellent functions such as protecting food from drying or freezing, preventing starch aging, preventing fat rancidity, stabilizing food tissue, and improving taste and aroma.

Organisms living in polar regions adopt a strategy of increasing the concentration of the solution by increasing the amount of water-soluble solutes in the cytoplasm to prevent water from escaping. The solutes produced at this time are amino acids or sugars such as glycine, proline, betaine, glycine betaine, glycerol, trehalose, mannitol, and sorbitol, which have low molecular weight and are highly soluble in water. When these substances accumulate in the cell wall, they can prevent osmosis and at the same time lower the freezing point and prevent cells from freezing. Among these, trehalose is reported to be particularly effective in preventing ice crystallization and recrystallization at temperatures below freezing in winter.

The present invention uses such sugars together with an anti-freezing agent to achieve a more effective anti-freezing effect by delaying the growth of ice crystals in addition to the heat of dissolution, deliquescence, hygroscopicity, and freezing point lowering effects.

(4) Oil or water repellent

The present invention also provides for sufficiently impregnating porous particles with the anti-icing agent to ensure that the anti-icing agent is applied to road construction paints and maintained for a constant and long period of time after application, and the lipophilic and water-repellent properties and corresponding porosity are also provided. It is intended to impart some insolubilizing properties to the particle surface.

In other words, the surface of the porous particles that have absorbed the anti-icing ingredient is coated with lipophilic oil or water repellent to lower the dissolution characteristics in water to ensure continuous effect and efficacy.

Eco-friendly oils such as soybean oil, linseed, and liquid paraffin can be used as the oil, and sodium methyl siliconate, potassium methyl siliconate, silicone-based water repellent, etc. can be used as the water repellent.

(5) Sodium alginate

When using the cation (calcium (Ca) component) in the anti-freeze component, sustained-release characteristics can be achieved through the action of insolubilizing the anti-freeze component and coating it by reacting with the eco-friendly gel component.

In other words, sodium alginate is a natural polymer coagulant and is a raw material used in various fields, including the food field. It exists in the form of sodium and salt in its molecular structure. Calcium ions in the anti-icing agent can react with this sodium alginate. In this case, it is immediately transformed into calcium alginate through a substitution reaction. Calcium alginate, unlike sodium alginate, has water-resistant properties.

Therefore, the present invention aims to maintain anti-icing performance for a long period of time by using the water-resistant properties of calcium alginate to provide a sustained-release property that slowly dissolves, such as by coating the surface of an anti-icing agent.

2. Method of manufacturing anti-freezing composition

(1) Manufacturing method 1

As shown in Figure 1, each component with anti-icing performance is mixed in an optimal ratio and dissolved in water to prepare an anti-icing solution (S11), and then porous particle powder is added and mixed to form an anti-icing solution into the porous particle powder. Absorb (S12). Then, porous anti-icing powder is manufactured by taking out the porous particle powder and drying it for a certain period of time (S13).

An anti-icing composition is prepared by coating the prepared porous anti-icing powder particles with an oleophilic oil or a material having water-repellent properties (S14), drying them (S15), and pulverizing them (S16).

At this time, the anti-icing solution may be one in which sugars are dissolved together with the anti-icing agent.

1) Example 1

As an anti-icing ingredient, a mixture of 800 g of calcium formate and 150 g of sodium acetate is used, and 50 g of trehalose is dissolved in 3 liters of water to make an anti-icing solution.

200 g of porous silica powder SS-SIL 530 (Schemtech) is added to the anti-icing solution, mixed thoroughly, and the anti-icing solution is absorbed.

The porous silica powder is taken out from the anti-icing solution and dried.

Add 50 g of water repellent to the dried porous anti-icing powder and mix so that the water repellent is sufficiently absorbed into the surface layer.

The porous anti-icing powder is sufficiently dried in a dryer at 90 degrees.

The dried porous anti-icing powder is pulverized.

2) Example 2

Same as Example 1 above, but CMA (calcium magnesium acetate) was used instead of calcium formate.

(2) Manufacturing method 2

As shown in Figure 2, each ingredient with anti-icing performance is mixed in powder form at an optimal ratio and dissolved in water to make an anti-icing solution (S21), and then a 2% solution of sodium alginate is added and mixed (S22). . As a result, the porous calcium alginate powder precipitated in the anti-icing solution is taken out and dried to prepare a porous anti-icing powder (S23). Finally, an anti-icing composition is prepared by grinding the porous anti-icing powder (S24).

In this case as well, the anti-icing solution may be one in which sugars are dissolved together with the anti-icing agent.

1) Example 3

As an anti-icing ingredient, a mixture of 800 g of calcium formate and 150 g of sodium acetate is used, and a mixture of 50 g of trehalose in powder form is dissolved in 3 liters of water to make an anti-icing solution.

Add 100 g of 2% sodium alginate solution to the anti-icing solution and mix thoroughly. As a result, porous calcium alginate powder is precipitated in the anti-icing solution.

A porous anti-icing powder is prepared by removing the precipitated porous calcium alginate powder and drying it. At this time, the drying temperature is carried out under conditions that do not exceed 150 degrees.

The dried porous anti-icing powder is pulverized.

2) Example 4

Same as Example 3 above, but CMA (calcium magnesium acetate) was used instead of calcium formic acid.

(3) The components and component ratios of the anti-icing compositions according to Examples 1 to 4 above can be expressed as shown in FIG. 3.

(4) Evaluation of metal corrosiveness

To evaluate the corrosion of metals by the anti-icing composition according to Examples 1 to 4, iron and aluminum specimens (5 cm x 10 cm, 1 mm thick) were prepared and tested by immersing them in the prepared anti-icing composition. Forced corrosion is measured by measuring the change in weight of the specimen before and after immersion (tested according to ASTM F483).

The test results were the same as shown in Figure 4 and all appeared to meet the corrosiveness criteria.

(5) Testing the adhesion strength of a coating film mixed with an anti-icing agent and an ice layer

Figures 5A and 5B show the results of an adhesion strength test between the surface and the ice layer of the formulation example (FIG. 6) using the anti-icing agents of Examples 2 and 4 described above.

As can be seen from the test results, the adhesion strength to the ice layer on the surface where the anti-icing agent was applied was measured to be significantly low. In other words, it can be confirmed that the anti-freezing effect is excellent.

3. Application example of anti-icing composition

(1) The anti-icing composition prepared by the above method is mixed with MMA (Methyl Methacrylate) resin and particles with anti-slip function, commercialized in the form of anti-slip paint for road paving, and applied to the road surface of asphalt or concrete. As the anti-slip particles, materials with various amorphous surfaces such as silica sand, zeolite, carbon, red clay, lime powder, waste glass powder, iron oxide, and titanium dioxide can be used.

Quantitatively, an anti-slip paint for road surface treatment with an anti-icing function is manufactured by mixing 200 to 300 g of the previously prepared anti-icing composition in powder form and MMA resin 300 with anti-slip particles and additives. The mixing ratio is as shown in Figure 6.

(2) Experimental example

According to the mixing ratio in Figure 6, the anti-icing agent, MMA resin, silica sand, calcium carbonate, and curing accelerator were mixed and formulated. Benzoyl peroxide (BPO) was used as a curing agent for MMA resin. Silica sand size 5 of 0.8 to 1.2 was used. The curing accelerator used was a special liquid catalyst (Bisomer PTE) from GEO SPECIALTY, UK. PTE is an amine-activated catalyst in a liquid state, and when used in combination with a BPO initiator, it has effects such as promoting the reaction of unsaturated polyester (UPE) resin and acrylic resin and reducing toxicity/odor.

Claims (4)

In the method of manufacturing an anti-icing composition for road pavement,
Dissolving an anti-freeze agent consisting of at least one of sodium acetate, potassium acetate, calcium formate, and calcium magnesium acetate (CMA) in water to prepare an anti-freeze solution;
Adding and mixing porous particle powder into the anti-icing solution and allowing the anti-icing solution to be absorbed into the porous particle powder;
manufacturing a porous anti-icing powder by removing the porous particle powder from the anti-icing solution and drying it;
coating the porous anti-icing powder with oil or a water repellent;
Drying the coated porous anti-icing powder; and
A method for producing an anti-icing composition for road pavement, comprising the step of pulverizing the dried porous anti-icing powder. In the method of manufacturing an anti-icing composition for road pavement,
Dissolving an anti-freeze agent consisting of two or more of sodium acetate, potassium acetate, calcium formate, and calcium magnesium acetate (CMA) in water to prepare an anti-freeze solution; ;
Adding and mixing a sodium alginate solution to the anti-icing solution to precipitate porous calcium alginate powder containing the anti-icing solution;
Manufacturing a porous anti-icing powder by removing the porous calcium alginate powder from the anti-icing solution and drying it; and
A method for producing an anti-icing composition for road pavement, comprising the step of pulverizing the porous anti-icing powder. According to claim 1 or 2,
A method for producing an anti-icing composition for road paving, characterized in that the anti-icing agent solution is prepared by dissolving saccharides together with the anti-icing agent in the water. An anti-icing composition for road paving manufactured by the production method of claim 1 or 2.