KR102683892B1 - Pavement anti-freezing composition comprising phase change material micro-capsule and manufacturing method thereof - Google Patents

Abstract

The present invention relates to an 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 calcium formate. (Calcium Formate) and calcium magnesium acetate (CMA: Calcium magnesium acetate) dissolving an anti-icing agent in water to prepare an anti-icing 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; Grinding the dried porous anti-icing powder; Manufacturing PCM (Phase change material) microcapsules and then drying them to obtain PCM microcapsule powder; And mixing the PCM microcapsule powder with the pulverized 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 paving containing PMC microcapsules and method for manufacturing the same {PAVEMENT ANTI-FREEZING COMPOSITION COMPRISING PHASE CHANGE MATERIAL MICRO-CAPSULE 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, to an anti-icing composition for road paving containing PCM microcapsules as an environmentally friendly and highly sustainable anti-icing composition. and its manufacturing method.

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 such 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.

In the end, the operating principle of the conventional anti-icing composition is that the composition is slowly dissolved and released from the road surface after construction, thereby developing a freezing point lowering effect on the road surface, thereby preventing the black ice phenomenon. It was inevitable that it would ultimately dissolve and disappear due to factors such as moisture, water, and snow.

Therefore, in order to prevent the loss phenomenon according to the dissolution rate of the anti-icing agent, the surface of the anti-icing agent composition is treated with water-repellent and waterproofing in various ways, or the exterior of the composition is coated in various ways to delay this phenomenon. This was used.

However, if too much water repellent and waterproofing treatment is applied to prevent loss of the anti-icing agent, the outflow rate of the anti-icing agent becomes too slow, making it difficult to achieve the intended anti-icing effect. In this case, a larger amount of treated anti-icing agent must be added to compensate for the effect of the slowly leaking anti-icing agent. However, in this case, if a large amount of water-repellent/water-repellent treated anti-icing composition is added to the binder, polymer, or paint, difficulties in mixing may arise or the coating film may become weakened, which is a problem.

[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 eliminate the risk of soil contamination or metal corrosion, as well as to improve various problems that occur in the construction of existing anti-icing agents and to obtain a longer-term anti-icing effect by microencapsulating a phase change material. The aim is to provide an anti-freezing composition containing and a method for producing the same.

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; Grinding the dried porous anti-icing powder; Manufacturing PCM (Phase change material) microcapsules and then drying them to obtain PCM microcapsule powder; and mixing the PCM microcapsule powder with the pulverized 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; pulverizing the porous anti-icing powder; Manufacturing PCM (Phase change material) microcapsules and then drying them to obtain PCM microcapsule powder; and mixing the PCM microcapsule powder with the pulverized porous anti-icing powder.

In the above manufacturing methods, the PCM used in the PCM microcapsules is preferably a paraffin-based PCM and is n-Tetradecane (C14) oil.

Additionally, in order to achieve the above object, the present invention provides an anti-icing composition for road pavement prepared by the above-described production 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.

In particular, by microencapsulating phase change material (PCM) and processing it into powder, a synergistic effect in anti-icing effect and efficacy can be expected by using it in parallel with an anti-icing agent in a paint that can be additionally applied to the road. . In other words, by using phase change material (PCM) by processing it into microcapsules, the encapsulated powder of the phase change material does not occur due to moisture, rain, snow, etc., compared to the case of using an anti-icing agent alone, so it is more sustainable. This allows a certain level of anti-icing effect to be achieved.

1 is a flowchart illustrating a method for producing an anti-icing composition according to a first embodiment of the present invention;
Figure 2 is a flowchart for explaining the manufacturing method of the anti-icing composition according to the second embodiment of the present invention;
Figure 3 is a component table of anti-icing compositions 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 of FIG. 3;
Figure 6 is a table illustrating mixing examples of the anti-icing composition of Figure 3 applied to anti-slip paint for road pavement together with PCM microcapsules;
Figures 7a and 7b are graphs showing the results of adhesion tests on ice for some of the mixing examples of Figure 6.

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 the anti-icing agent 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, as well as 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.

Grind the dried porous anti-icing powder.

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. Phase change materials and microencapsulation

(1) Phase change material

Black ice in winter mainly occurs in the 0~5℃ range.

Among phase change materials (PCMs), phase changes occur in these areas and PCM microcapsules are processed and used using hydrophobic oils with high heat capacity.

In general, PCM is a material developed to store and release latent heat, which is used to change the state of a substance, in a specific temperature range as needed. PCM that operates in solid-liquid phases is largely divided into organic and inorganic ( It can be divided into Inorganic and Eutectic mixtures. Among these, organic PCM can be divided into paraffinic and non-paraffinic types. Organic PCM has the advantage of not experiencing phase separation problems and not being overcooled during the crystallization process. Organic PCM is easy to use due to its advantages such as high chemical stability, volume stability, and noncorrosiveness, and is used in many fields.

－ Among organic PCMs, paraffin-based PCMs are represented by straight-chain n-alkanes (CH3-(CH2)n-CH3) and have various melting temperatures depending on the chain length (or carbon content), i.e., a wide range of melting temperatures. It indicates the phase change temperature range and can be used in various fields.

－ Paraffin-based PCM has the advantage of stable and low vapor pressure, as it does not exhibit phase separation during repeated phase changes, and has excellent volumetric stability.

The physical properties of representative paraffin-based PCM that can be used to prevent black ice are shown in [Table 1] below.

paraffin material Melting point (℃) Latent heat (kJ/kg) Density (kg/㎥) Thermal conductivity (W/mK) n-Tetradecane (C14) 6 228~230 763 0.14 n-Pentadecane (C15) 10 205 770 0.20 n-Hexadecane (C16) 18 237 770 0.20 n-Heptadecane (C17) 22 213 760 0.14

(2) Microencapsulation of phase change materials

PCM produced through the micro-encapsulation process exhibits various advantages such as improved heat transfer ability due to an increase in the surface area available for heat exchange, reduced reaction with the surrounding environment within the application target, and reduced expansion pressure due to volume change, and has a small particle size. Therefore, it can be used directly in powder form and there is little risk of destruction of the outer shell, greatly reducing the risk of leakage from the application target.

In particular, among paraffin-based phase change materials that are relatively inexpensive and easily available as shown in [Table 1] above, n-tetradecane (n) has phase change properties effective in the black ice generation area (0 to 5 degrees). In the case of -tetradecane (C14), it can be said to be very effective in demonstrating the corresponding physical properties. In the case of paraffinic products with a longer carbon chain, a phase change phenomenon occurs in a temperature region higher than that where black ice occurs. , Conversely, in the case of paraffin-based materials with carbon chains smaller than this, the phase change phenomenon occurs below the temperature at which water freezing occurs (0°C), so it can be said to be unsuitable for predicting the freezing phenomenon.

In addition to paraffin oils, hydrophonic oils that have sufficient heat capacity and can undergo phase change in the temperature range where black ice occurs can be used as phase change (PCM) materials to prevent black ice.

－ An important factor in the micro-encapsulation method is the thickness of the shell surrounding the PCM, which must be sufficiently robust to be maintained in a repeated temperature environment and at the same time must be thin to ensure smooth heat transfer, but careful technology is required to meet such performance. do.

The phase change (PCM) microcapsules manufactured in this way can prevent fluidity by processing the phase change (PCM) oil liquid into powder, and can be expected to have an anti-icing effect without leakage of the liquid after mixing with the paint. In particular, the loss of phase change (PCM) material inside the microcapsule does not occur due to external factors such as moisture, snow, or rain, resulting in a continuous and consistent anti-icing effect.

4. Preparation of PCM microcapsules

(1) Composition and preparation of melamine initial condensation polymer

Add 200g of water to a 500ml beaker. Add 50g of formalin 35%, 100g of melamine powder, and 10g of urea.

Add 3g of 2% caustic soda solution here.

Gradually increase the temperature while stirring the mixture sufficiently. Heat for about 10 to 15 minutes while stirring until the temperature reaches about 60°C.

(2) Manufacturing of phase change microcapsules

Add 0.5 g of sodium lauryl sulfate (SDS) to 500 g of 3% solution of PVA (polyvinyl alcohol) 217 and sufficiently dissolve. Slowly add 250g of n-tetradecan oil here. At this time, the initial stirring is carried out slowly for about 5 minutes, and then the stirring speed is sufficiently increased to induce an emulsification reaction. After emulsification has sufficiently progressed, add 300g of water. Slowly add 50g of 10% citric acid solution here. Afterwards, stir sufficiently for more than 10 minutes.

Here, 200 g of the melamine initial condensation polymer prepared previously is slowly added (within about 5 minutes). Afterwards, the temperature is gradually raised to 70°C. After reacting at 70°C for about 1 hour, raise the temperature to 80°C again and react for more than 3 hours.

(3) Powdering of PCM microcapsules

A mixed solution of 300 g of 10% citric acid solution and 20 g of 1% sulfuric acid solution is slowly added to the PCM microcapsule slurry prepared above. At this time, agglomeration occurs in the microcapsule slurry, and from this point on, the stirring speed is maintained very slowly, the temperature is maintained at 60°C, and stirring is continued for about 1 hour.

Afterwards, the coagulated microcapsules are filtered through a filtration device and washed with 500 g of water at 70°C. Afterwards, it is completely dried in a dryer at 60-70°C.

The dried phase change microcapsules are processed through a particle size selector of approximately 100 mesh to obtain powder.

5. Example of mixed application of anti-icing composition and PCM microcapsules

(1) The anti-icing composition and PCM microcapsules prepared in the same manner as above are mixed with MMA (Methyl Methacrylate) resin and anti-slip particles and commercialized in the form of anti-slip paint for road paving and applied to asphalt or concrete surfaces. It is applied. 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, by adding anti-slip particles and additives to 200-300 g of the previously prepared powder anti-icing composition, within 50 g of PCM microcapsules, and 300 g of MMA resin, a slip for road surface treatment with an anti-icing function is created. Manufactures anti-inflammatory paints. The mixing ratio is as shown in Figure 6.

If PCM microcapsules are used within 2%, it is difficult to achieve the desired effect due to insufficient PCM content, and if PCM microcapsules are used more than 5%, the expression of PCM physical properties is excellent, but it is a factor in increasing the cost, so the content should be kept within 2 to 4% if possible. Adjusted. However, the content during actual use is not limited to this and can be adjusted appropriately.

In the case of anti-icing agent, if more than 40% is used, anti-icing performance can be excellent, but due to the lack of adhesive polymer (e.g. MMA resin) used together, the adhesion to the road and the coating film are weakened, making it difficult to form the desired road coating film. there is. Therefore, in the case of anti-icing agents, it is desirable to use it in a range that does not exceed 35% as much as possible. On the other hand, if less than 5% is used, the anti-icing effect in the final formed coating film may be insufficient due to the insufficient content of the anti-icing agent. That is, it is preferably used in a range of about 5 to 35%.

(2) Experimental example

According to the mixing ratio in Figure 6, the anti-icing agent, PCM capsule, iron oxide, MMA resin, hardening accelerator, calcium carbonate, and silica sand were mixed and mixed. 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.

(3) Adhesion strength test of a coating film mixed with PCM microcapsules and anti-icing agent and an ice layer

Figures 7a and 7b show the results of the adhesion strength test between the surface and the ice layer in the application example using Formulation 1 and Formulation 2 of Fig. 6.

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.

In particular, compared to the graphs of FIGS. 5A and 5B where only the anti-icing agent is applied, the adhesion strength tends to be distributed slightly lower overall, showing that the anti-icing effect is superior.

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;
Grinding the dried porous anti-icing powder;
Manufacturing PCM (Phase change material) microcapsules and then drying them to obtain PCM microcapsule powder; and
A method for producing an anti-icing composition for road pavement, comprising the step of mixing the PCM microcapsule powder with the pulverized 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;
pulverizing the porous anti-icing powder;
Manufacturing PCM (Phase change material) microcapsules and then drying them to obtain PCM microcapsule powder; and
A method for producing an anti-icing composition for road pavement, comprising the step of mixing the PCM microcapsule powder with the pulverized porous anti-icing powder. According to claim 1 or 2,
A method for producing an anti-icing composition for road pavement, characterized in that the PCM used in the PCM microcapsules is a paraffin-based PCM and is n-Tetradecane (C14) oil. An anti-icing composition for road paving manufactured by the production method of claim 1 or 2.