KR20230105737A - Anti-freeze material composition, manufacturing method thereof and manufacturing method for asphalt concrete using the same - Google Patents

Abstract

The present invention relates to an anti-icing material composition for asphalt concrete that can prevent black ice generated from road pavement by replacing fillers in asphalt concrete, a manufacturing method thereof, and an asphalt manufacturing method using the same.
The anti-icing composition according to the present invention includes 0.1 to 20% by weight of a mineral, and 50 to 99.7% by weight of at least one chloride selected from calcium chloride, sodium chloride, magnesium chloride, and aluminum chloride, and at least one of a silica metal salt and a silane compound. 0.1 to 10% by weight of a sealant and 0.1 to 20% by weight of water.

Description

Anti-icing material composition for asphalt concrete for preventing black ice, method for manufacturing the same, and method for manufacturing asphalt using the same

The present invention relates to an anti-icing material composition for asphalt concrete that can prevent black ice generated from road pavement by replacing fillers in asphalt concrete, a manufacturing method thereof, and an asphalt manufacturing method using the same.

The main cause of traffic accidents in the winter is thin ice formed invisible on roads. When a sudden cold wave occurs, the temperature of the road surface suddenly drops, and moisture in the air condenses and freezes, resulting in a phenomenon that appears dark to the naked eye. This is called black ice.

Such black ice usually leads to a major accident because the driving vehicle is not controlled, leading to a major cause of traffic accidents.

To solve this problem, anti-icing materials are sprayed on the surface of roads for snow removal. Currently, the biggest problem is deterioration of concrete and environmental problems caused by de-icing salts of anti-icing materials, especially in areas with a lot of snow or low temperatures. In this case, the deicing agent causes severe damage to concrete, such as surface peeling of the road surface, induction of alkali aggregate reaction, and corrosion by chloride ion penetration, etc., and durability is rapidly reduced, resulting in high maintenance costs. The snow removal agent that has been stretched and passed through the stormwater pipe has a negative impact on the environment.

Existing snow removal methods use sand or a method of spraying a mixture of snow removal agents such as calcium chloride. In the case of a sudden cold wave or heavy snow, the dispatch of snow removal vehicles is delayed or snow removal work becomes impossible due to traffic congestion, which requires a lot of time and manpower. you will need equipment. In addition, since the existing snow removal agent has a problem that the concentration of the snow removal agent is lowered when snow continues to fall after spraying, and eventually freezes again, this method could not fundamentally solve the slip accident on snowy or icy roads.

Looking at the conventional technology related to freezing prevention, Patent Publication No. 10-2012-0009560 (February 2, 2012) (prior art 1), Patent Registration No. 10-1050740 (July 14, 2011) (prior art) Technology 2), Registered Patent No. 10-1971714 (April 7, 2019) (prior art 3), etc.

Prior Art 1 is a technology that prevents ice from being generated by activating the anti-icing chemical during snowfall by forming a porous thin-layer packaging body using a polymer as a binder on the existing packaging and accommodating the anti-icing chemical agent in the porous thin-layer packaging body for a certain period of time. is presenting

In addition, the prior art 2 can minimize maintenance costs without supplying a continuous energy source, can reduce energy resources by using recycled aggregate, etc., and snow or ice is removed from the surface during separate snow removal or ice making operations. It proposes an anti-icing road pavement method that is easy to remove snow because it is non-stick and can prevent traffic congestion or accidents caused by snow or surface freezing.

Prior art 3 is a form in which calcium carbonate is mixed with chloride and then used to impart water repellency to the surface using silane to prepare an asphalt additive and add it instead of a filling material during the manufacture of asphalt concrete.

However, prior art 1 has a problem of increased tire wear and deterioration in drivability of a vehicle due to severe friction on the road pavement surface, and prior art 2 has a problem in that it does not provide a fundamental solution for preventing icing. In the prior art 3, it is difficult to continuously control the emission of chloride by treating the chloride with an organic alkoxy silane.

The present invention has been made to solve the above problems, and the present invention is an anti-icing asphalt pavement additive composition capable of preventing black ice that can maintain the ability to continue snow removal for a long time using a small amount of clay, siliconate and silane. It is an object of the present invention to provide an additive for asphalt paving with black ice prevention performance by presenting a manufacturing method and a manufacturing method of an anti-icing asphalt mixture.

The anti-icing composition according to the present invention for the purpose of solving the above problems is 0.1 to 20% by weight of a mineral, and 50 to 99.7% by weight of at least one chloride of calcium chloride, sodium chloride, magnesium chloride, aluminum chloride, and a silica metal salt, 0.1 to 10% by weight of a sealant containing at least one of silane compounds, and 0.1 to 20% by weight of water.

In addition, the mineral material includes attapulgite, and the attapulgite is characterized in that it can form a film by forming a lattice by charging.

In addition, the chloride includes sodium chloride and polyvalent chloride, and the ratio of the sodium chloride to the polyvalent chloride may be 99: 1 to 51:49 by weight.

In addition, the method for producing the anti-icing material composition includes the step of adding the mineral to the chloride and stirring, and adding a solution obtained by mixing the water and the sealant in the form of spraying or spraying during stirring, for 0.1 to 1 hour. It may include stirring, and evaporating the mixed anti-icing material in an evaporator at a temperature of 100 to 300 ° C. to dry it to an anhydrous state, and pulverizing the dried anti-icing material to have a particle size of 0.6 mm or less. there is.

The present invention having the above configuration, steps and characteristics can be used as a material for anti-icing pavement at low usage compared to conventional anti-icing materials for road pavement, has low corrosion and environmental properties, and thereby improves anti-icing performance of asphalt pavement. has the effect of providing

1 is a view comparing and explaining the principle of slowly releasing the anti-icing material of the present invention and the existing technology.
Figure 2 is a view showing the SEM-EDS analysis results of the existing anti-icing material for asphalt concrete and the present composition.
Figure 3 is a conceptual diagram of step-by-step manufacturing of the asphalt additive for preventing black ice of the present application.

Since the present invention can have various changes and various forms, the implementation examples (or embodiments) will be described in detail in the text. However, this is not intended to limit the present invention to a specific form disclosed, and should be understood to include all modifications, equivalents, or substitutes included in the spirit and scope of the present invention.

Terms used in this specification are only used to describe a specific embodiment (aspect, aspect, aspect) (or embodiment), and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as ~comprising~ or ~consisting of are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that it does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, they should not be interpreted in an ideal or excessively formal meaning. don't

~First~, ~Second~, etc. described in this specification will only be referred to to distinguish different components from each other, regardless of the manufacturing order, and the names in the detailed description and claims of the invention may not match.

Hereinafter, an anti-icing material composition for asphalt concrete for preventing black ice according to the present invention (hereinafter, the present composition), a manufacturing method thereof (hereinafter, the present method), and an asphalt manufacturing method using the same will be similarly described.

This composition is an anti-icing composition for adding asphalt that can prevent black ice that can occur in winter by including an anti-icing additive in asphalt road pavement. 50 to 99.7% by weight of at least one chloride, 0.1 to 10% by weight of a sealant including at least one of a silica metal salt and a silane compound, and 0.1 to 20% by weight of water.

The present composition including the above composition can prevent black ice that may occur in winter by adding a certain amount to an asphalt mixture to form a mixture.

In detail for each component, first, minerals are added as chloride additives, and inorganic materials such as clay such as attapulgite or bentonite, calcium carbonate, magnesium carbonate, aluminum carbonate, slag, cement, talc, and calcite are used as minerals. It is possible and it is preferable to use one that does not react with chloride.

In the above, the carbonate has the advantage of being relatively inexpensive because it can be easily obtained from various resources such as various rocks such as marble and limestone and shells of creatures such as shells and eggshells.

In addition, slag, fly ash, cement, etc. are economical because they are by-products of manufacturing industrial materials or can be produced through mass production, and when mixed with asphalt, they do not degrade physical properties, so excellent performance can be obtained when applied. It is relatively large and has a relatively low chloride content, so it has the disadvantage that the amount used may increase when manufactured as an additive.

And in the case of clay materials such as attaful agaite and bentonite, the price is relatively expensive, but there is an advantage that the amount of additives can be reduced because the chloride content can be increased.

These minerals may be included in an amount of 0.1 to 20% by weight. For example, if it is contained at less than 0.1% by weight, the preservation ability of chloride is small, so when an asphalt mixture is prepared by preparing an asphalt mixture, the chloride generated in the asphalt mixture is rapidly eluted, and the black ice prevention ability may be fully expressed in a short period of time, When used in excess of 20% by weight, since the amount of chloride for initial freezing prevention is relatively low, there is a problem in that the anti-icing effect is reduced and the period of use is reduced.

In a preferred embodiment, the mineral material may include attapulgite, that is, a thixotropic material capable of forming a carrier. This is because when a thixotropic material such as attapulgite constituting the lattice is used, the water-soluble anti-icing component can be confined inside and the outside can be formed into a water-insoluble film structure.

Figure 1a is a view explaining the principle of slowly releasing the existing anti-icing material. Referring to FIG. 1A, the conventional technology has a size of about 80 μm, and inorganic calcium carbonate is used as a core, and an anti-icing material such as calcium chloride or sodium chloride is attached to the outside, and then the outer wall is composed of a water-repellent layer so that the anti-icing material is water-repellent. prevented rapid dissolution when in contact with On the other hand, referring to FIG. 1b explaining the control of the anti-icing dissolution rate of the present invention, the present invention is a method of trapping chloride, an anti-icing material, in a state in which attapulgite forms a lattice by charging in a dispersed state externally In, a carrier technology for forming a film with a water repellent material was applied here.

This present invention can confine a large amount of snow removal material inside, there is a very great advantage that the amount used when applied is small. Figure 2 is a view showing the SEM-EDS analysis results of the existing anti-icing material for asphalt concrete and the present composition. Referring to the drawing, the existing technology (left) has a chlorine ion content of 34.51% among surface components, while the present invention In the case of (right), it can be seen that it is about twice as high as 59.84%. This means that the same performance can be obtained even if the amount used is reduced by half, and it also implies that there is an advantage of being able to switch to an eco-friendly snow removal ingredient by freely changing the ingredients.

Next, chloride is a main agent that acts as a main agent for preventing freezing, and includes at least one of calcium chloride, sodium chloride, magnesium chloride, and aluminum chloride. These chlorides have the ability to prevent freezing by creating an electrolyte in the presence of water in the solid state. On the other hand, when chloride comes in contact with water, it dissolves very quickly and is quickly lost by becoming a solution. There is a need to make it work only under conditions.

In the above, in order to dissolve the chloride slowly, it is necessary to directly act on the chloride to slow down the dissolution rate of the chloride. Since there is no method that can directly act, a method of controlling the dissolution rate of the chloride by surrounding the chloride in an appropriate way is required. In the present invention, a method of controlling the dissolution rate of chlorides was applied by uniformly presenting minerals between chlorides and attaching binding materials thereto.

As a method for controlling the dissolution rate of chloride, the present composition includes at least one of a silica metal salt and a silane compound as a sealant, which is used to convert the surface of a mineral material into a sealant phase, and the amount of the sealant is 0.1 It is preferably ~ 10% by weight. For example, if the content is less than 0.1% by weight, the densification effect is not great, so the chloride is easily eluted, making it difficult to obtain the effect of controlling the dissolution rate, and if it is greater than 10% by weight, it is not economical.

In the above, the silica metal salt includes a silicate metal salt such as sodium silicate, potassium silicate, magnesium silicate, lithium silicate, sodium silicate, potassium silicate, and lithium silicanate, and the silane compound is an alkylalkoxysilane, a hydroxypropyl tree Methoxy silane, hydroxy propyl ethyl silane, n-octyl triethoxy silane, and the like may be used.

Next, water is used to obtain even dispersion of minerals and chlorides, and 0.1 to 20% by weight is used. If it is less than 0.1% by weight, the dispersion effect is reduced, and if it is greater than 20% by weight, the cost increases during drying, but the amount used It should be selected in consideration of the fact that the smaller the is, the more advantageous it is during drying.

3 is a conceptual diagram of step-by-step manufacturing of an asphalt additive for preventing black ice. Referring to FIG. 3, the manufacturing method (this method) of the anti-icing material composition according to the present invention is a first step of mixing chlorides and minerals, and mixing an appropriate amount of water with the mixed chlorides and minerals to achieve even dispersion. A second step of the process, a third step of treating the surface of the mineral by spraying a sealant on the mineral, and a fourth step of drying the surface-treated mixture and then pulverizing the asphalt mixture to a particle size.

Specifically, for each step, the first step and the second step are steps of mixing chloride, mineral substances, and water, and adding minerals to chloride and stirring them in a stirrer, at which time a predetermined amount of water is added. It can be.

In the above, the mixing step of the first step is to mix the chloride and the mineral evenly, and the shape, size and temperature of the mixer are not important, but it can usually be performed at room temperature.

In addition, in the above, the second step is a step of mixing an appropriate amount of water with a mixture of chlorides and minerals so that the minerals are uniformly dispersed. Sodium chloride exists in the solid phase. Therefore, when a large amount of water is used, polyvalent chloride such as calcium chloride exists in a supersaturated state between the state in which sodium chloride and minerals are dispersed in the solid phase, and a large amount of polyvalent chloride exists on the surface of the finished additive, resulting in rapid anti-freezing ability can be obtained. Therefore, in order to prevent continuous freezing, the ratio of sodium chloride and polyvalent chloride in chloride may be composed of 'sodium chloride: polyvalent chloride = 100:0 to 30:70' in weight ratio, and the preferred ratio is '99:1 to 51:49' . In the above, the ratio between sodium chloride and polyvalent chloride may be configured as 50:50.

Next, the third step is to treat the surface of the mineral by spraying the sealant on the mineral. During stirring, a mixed solution of water and sealant is injected in the form of spraying or spraying. In the third step, the stirring time is 0.1 It is preferably made for ~ 1 hour.

In the above, the surface treatment of the third step is performed through spraying immediately after the second step is completed, and at this time, it is preferable to spray while the mixer is operating for an even surface treatment, and the normal spraying temperature can be carried out at room temperature .

Also, in the above, the injection time is not particularly defined, but 10 minutes or more may be applied. This is because, in the case of less than 10 minutes, the sealant is not injected evenly, and only a part of the surface treatment occurs, making it difficult to obtain even characteristics.

Next, the fourth step is a step of drying the surface-treated mixture and then pulverizing the asphalt mixture to a particle size, evaporating the mixed anti-icing material at a temperature of 100 to 300 ° C in an evaporator to dry it to an anhydrous state, And it may include the step of pulverizing the dried anti-icing material to have a particle size of 0.6 mm or less.

In the above, the moisture content after drying in the drying and grinding step of the fourth step should be within 1%, and if it is more than 1%, storage stability may be deteriorated due to easy moisture absorption or sticking to each other.

Hereinafter, experimental examples for demonstrating the effect of the present composition will be introduced.

[Experimental example]

According to the present method, a chloride mixture was prepared by mixing 843 g of sodium chloride, 50 g of calcium chloride, and 2 g of attapulgite. When 80 g of water was mixed here, a mixture slurry was prepared, and 20 g of a silica metal salt and 5 g of isobutyltriethoxysilane were sprayed thereto to complete the surface treatment. The surface-treated mixture was dried in an oven at 130° C. for 12 hours and ground in a ball mill to prepare an anti-icing material for adding asphalt. Table 1 is a particle size distribution of the prepared anti-icing material.

In addition, the properties of the prepared anti-icing material for adding asphalt are shown in Table 2 below.

1) Comparative example, sodium chloride: calcium chloride = 7: 3 snow remover

2) Dissolve 1g of additive in 100g of distilled water for 24 hours, filter it through filter paper, dry it at 105℃, and then reciprocal of the amount of undissolved remaining material

3) Time to float on the surface without sinking after dropping 5g of additives into 500g of distilled water

4) Measure the tensile adhesion strength of ice after freezing ice on the surface of the frozen adhesion strength of the mastic sample mixed with the heated asphalt and anti-icing material in a 1:1 ratio

Next, the production of asphalt (asphalt mixture) capable of preventing black ice using the present composition is used by replacing some or all of the filler (filler) used in asphalt production with the present composition, the role of the filler is It is intended to improve water immersion stability by filling the gaps in the asphalt, the particle size is 0.6 mm or less, and the moisture content is 1.0% or less. Therefore, black ice prevention asphalt pavement can be completed by using the present invention having the same particle size and water content as a part or all of the filler, and a preferable replacement ratio is 30 to 100% by weight of the filler. .

Hereinafter, an experimental example for demonstrating the effect of ascon using the present composition will be introduced.

[Example 1]

10 kg of an SMA asphalt mixture was prepared by mixing 7.4 wt% of an asphalt binder, 83.8 wt% of aggregate, 0.5 wt% of fiber, 3.7 wt% of a filler, and 4.6 wt% of an anti-icing material.

[Comparative Example 1]

10 kg of an SMA asphalt mixture was prepared by mixing 7.4 wt% of an asphalt binder, 83.8 wt% of aggregate, 0.5 wt% of fiber, and 8.3 wt% of a filler.

The asphalt mixture prepared according to Example 1 and Comparative Example 1 was tested for aggregate porosity according to KS F 2364, saturation according to KS F 2349, dynamic stability according to KSF 2374, drain-down test according to KS F 2489, As a result of conducting the deformation strength test by the Kim test, the results shown in Table 3 were derived.

As can be seen in Table 3, the asphalt mixture prepared according to Example 1 satisfied the quality standards and had little difference in physical properties compared to Comparative Example 1.

In addition, the asphalt mixture prepared according to Example 1 and Comparative Example 1 was put into a test mold, respectively, taped to a thickness of 1 cm, poured with water, lowered the temperature in a freeze-thawer, and then frozen, and then a jig was attached to the tensile test according to the temperature. As a result of conducting the adhesive strength test, the results shown in Table 4 were obtained.

As can be confirmed from Table 4, it can be seen that Example 1 has a significantly lower tensile adhesive strength than Comparative Example 1, so that even if black ice occurs, it is easily removed and has an anti-icing preventive effect so that black ice does not occur.

The present invention described above with reference to the accompanying drawings is capable of various modifications and changes by those skilled in the art, and such modifications and changes not limited by the claims should be construed as being included in the scope of the present invention.

Claims (4)

0.1 to 20% by weight of minerals;
50 to 99.7% by weight of at least one chloride of calcium chloride, sodium chloride, magnesium chloride, and aluminum chloride;
0.1 to 10% by weight of a sealant containing at least one of a silica metal salt and a silane compound; and
0.1 to 20% by weight of water;
Anti-icing material composition comprising a.
The method of claim 1,
The mineral includes attapulgite,
The attapulgite is an anti-icing material composition, characterized in that to form a film by forming a lattice by charging.
. The method of claim 1,
The chloride includes sodium chloride and polyvalent chloride,
The method of producing an anti-icing material composition, characterized in that the ratio of the sodium chloride and the polyvalent chloride is 99: 1 to 51:49 by weight.
In the manufacturing method of the anti-icing material composition according to claim 1,
Adding the mineral to the chloride and stirring;
Injecting a solution obtained by mixing the water and the sealant in the form of spraying or spraying during stirring, and stirring for 0.1 to 1 hour;
Evaporation of the mixed anti-icing material in an evaporator at a temperature of 100 to 300 ° C. to dry it in an anhydrous state; and
Grinding the dried anti-icing material to have a particle size of 0.6 mm or less;
Method for producing an anti-icing material composition comprising a.

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