KR102052162B1 - Heat-resistant coating composition for road surface pavement and method of heat-resistant paint construction using the same - Google Patents

Abstract

Disclosed are a heat-shielding paint composition for road surface pavement and a paint construction method using the same. The heat-shielding paint composition for road surface pavement of the present invention comprises: a heat-shielding resin including (a) 20 to 30 wt% of an acrylic resin having a molecular weight of 40,000 to 60,000, (b) 50 to 70 wt% of a first monomer including acrylate having an alkyl group of 3 to 6 carbons including one or two oxygen atoms, and (c) 5 to 15 wt% of a styrene ethylene butylene styrene (SEBS) resin having a molecular weight of 50,000 to 70,000, a Shore A hardness of 35 and an elongation of 600% or more; 1 to 10 wt% of a black infrared reflective pigment dispersed in the heat-shielding resin and having an infrared reflectance of 45% or more; 1 to 5 wt% of a plastic microsphere dispersed in the heat-shielding resin, having a specific gravity of 0.01 to 0.2 g/cc, and having a high light reflectance; and 1 to 5 wt% of benzoyl peroxide which is a curing agent. In addition, the heat-shielding paint composition has a specific gravity of 1.6 to 1.9 at 25°C, a viscosity of 15.000 to 30,000 Cps with a type B viscometer, and a pot life of 10 to 20 minutes.

Description

Heat-resistant coating composition for road surface pavement and method of heat-resistant paint construction using the same}

The present invention relates to a heat-shielding coating composition for road surface packaging and a heat-shielding coating construction method using the same, and more particularly, to a heat-shielding coating composition for road-surface packaging having excellent crack resistance and a heat-shielding coating construction method using the same.

In recent years, the average annual temperature has risen due to the increase in the use of air conditioners due to the concentration of the population and the expansion of urban centers, and the heat island phenomenon has emerged as a social problem.

The heat island phenomenon is similar to the island contour when drawing the isotherm connecting the temperature between the city center and the surrounding area, and the high temperature part of the city is called the heat island. Say what appears.

In particular, the temperature of the asphalt pavement in the summer is over 60 ℃ and absorbs this heat to continue the tropical night where the temperature does not drop even at night there is a problem that is damaging the quality of life of people.

As an example of conventional asphalt concrete technology, domestic patent registration No. 0503948 uses a hydrophilic fiber reinforcement to suppress cracks, and a fiber reinforcement pitcher that uses a blast furnace slag fine powder or fly ash to form a structure that is chemically more stable than conventional permeable concrete. Cone related technology has been presented.

However, the water-permeable concrete in the prior art has a problem that it is difficult to fundamentally solve the heat island phenomenon because the blocking effect of the radiant heat, which is the main cause of the heat island phenomenon occurs in summer.

Therefore, the object of the present invention is that the coating film of the conventional coating having a non-slip function is hard, due to a severe temperature difference in the summer and winter after construction, is peeled off while the crack occurs in the coating film by shrinkage expansion of the coating film It is to provide a heat shielding coating composition for road surface paving and excellent heat shielding paint construction method using the same by improving this.

Another object of the present invention is to reduce the road surface asphalt pavement temperature, to provide a heat-shielding coating composition for road surface pavement that can reduce the number of urban heat island phenomenon and tropical night occurrence.

Another object of the present invention is to provide a heat-shielding coating composition for pavement, which can suppress the rise of the road surface to improve the fluidity of the asphalt to extend the life of the asphalt and ensure visibility and slip resistance.

In order to achieve the above object, the present invention (a) having 20 to 30% by weight acrylic resin having a weight average molecular weight of 40,000 to 60,000, (b) having an alkyl group having 3 to 6 carbon atoms containing one or two oxygen atoms Styrene ethylene butylene styrene (SEBS) resin having a weight average molecular weight of 50 to 70% by weight of the first monomer consisting of acrylate and (C) 50,000 to 70,000, a hardness of Shore A of 35, and an elongation of 600% or more; Thermal insulation resin containing a weight%; 1 to 10% by weight of a black infrared reflecting pigment dispersed in the heat shielding resin and having an infrared reflectance of 45% or more: dispersed in the heat shielding resin and having a specific gravity of 0.01 to 0.2 g / cc , pores are formed therein It consists of a cross-linked polyacrylate resin, and contains 1 to 5% by weight of plastic microsphere ( reflecting infrared rays ) and 1 to 5% by weight of benzoyl peroxide as a curing agent, specific gravity 1.6 to 25 ℃ It provides a heat-shielding coating composition for road surface packaging having a viscosity of 1.9 to 30,000 Cps and a pot life of 10 to 20 minutes.

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As described above, according to the present invention, the heat-shielding coating composition for pavement and the heat-shielding coating method using the same are cracked as the existing heat-shielding coating for pavement passes through the four seasons, resulting in poor durability due to peeling of the coating. Can improve the durability.

1 shows the temperature of a paved road according to Example 1;
2 is a view showing the temperature of a paved road according to Comparative Example 1. FIG.
3 is a view showing the temperature of the road (a) paved with conventional asphalt.

Hereinafter, the present invention will be described in more detail.

The heat-shielding coating composition for pavement according to the present invention by reducing the temperature of the road surface to reduce the heat island (Heat Island) in the downtown, not only has excellent heat shielding properties, but also improve the fluidity of the asphalt can extend the life of the asphalt In order to ensure visibility and slip resistance, it includes a heat shielding resin, an infrared reflecting pigment, a plastic microsphere and a curing agent.

The heat shield resin serves as a kind of binder for fixing the infrared reflecting pigment and the plastic microsphere to be described later, and includes an acrylic resin, a first monomer and a styrene ethylene butylene styrene (SEBS) resin. do.

The acrylic resin serves as an adhesive, and may be, for example, a polymethyl methacrylate resin (PMMA) or the like. The molecular weight of the acrylic resin is 40,000 to 60,000, preferably 45,000 to 55,000. If the molecular weight of the acrylic resin is too small, it does not play a role as an adhesive, if too large, may be agglomerated without dissolving. The content of the acrylate is 20 to 30% by weight, preferably 25% by weight based on the total heat shielding resin composition.

The first monomer serves to dissolve the acrylic resin, and includes an acrylate having an alkyl group having 3 to 6 carbon atoms including one or two oxygen elements (O). Preferably, methyl methacrylate (MMA, methylmethaacrylate), tripropylene glycol diacrylate (TPGDA, Tripropylene glycol diacrylate), 2-ethylhexyl acrylate (2-ethylhexylacrylate), hydropropyl methacrylate (HydropropylMethaacrylate) two kinds It is used by mixing the above, more preferably, methylmethaacrylate (M) preferably include tripropylene glycol diacrylate (TPGDA, Tripropylene glycol diacrylate), 2-ethylhexyl acrylate (2-ethylhexylacrylate), hydropropyl methacrylate ( HydropropylMethaacrylate) is included at least one.

The total content of the first monomer is 50 to 70% by weight, preferably 55 to 65% by weight based on the total heat shielding resin composition. Outside of the content, there is a difficulty in dissolving the acrylic resin, it may be difficult to maintain the shape of the coating film.

In addition, in the first monomer, methyl methacrylate (MMA), tripropylene glycol diacrylate (TPGDA, Tripropylene glycol diacrylate), 2-ethylhexyl acrylate (2-ethylhexylacrylate), hydropropyl methacrylate (HydropropylMethaacrylate) ), The content ratio (weight ratio) of the mixture containing one or more species is 15: 1, preferably 11: 1. If the content is out of the content, it is difficult to dissolve the acrylic resin, and it is difficult to maintain the form of the coating film. Can be.

The SEBS (styrene ethylene butylene styrene) resin serves to give the flexibility of the coating film, Shore A hardness of 35, and includes a SEBS (styrene ethylene butylene styrene) structure of elongation of 600% or more. The shore A is a hardness unit of the rubber, has a numerical range of 0 to 100, the smaller the range of the value is soft (soft), the larger the hard (hard) meaning. The content of the styrene ethylene butylene styrene (SEBS) resin is 5 to 15% by weight, preferably 10% by weight with respect to the total heat-shielding coating composition, if out of the range, the coating film is too soft (soft), hard (Hard) There is a problem. The weight average molecular weight of the SEBS resin ( if necessary, simply referred to as "molecular weight" ) is 50,000 to 70,000, preferably 55,000 to 65,000. If it is out of the above range, there is a problem that it does not dissolve well in the monomer.

The infrared reflecting pigment is dispersed in the heat shielding resin, and serves to highly reflect infrared rays from outside such as sunlight, and uses a black infrared reflecting pigment. The infrared reflecting pigment has an infrared reflectance of 45% or more, thereby making it possible to highly reflect infrared rays and to prevent heat accumulation on the road. The content of the infrared reflecting pigment is 1 to 20% by weight, preferably 5 to 10% by weight based on the total heat shielding paint composition. If the content is out of the content, the infrared ray may not be highly reflected and may accumulate on the road. have.

When the black heat shielding pigment is used as the infrared reflecting pigment 24, the color of the black heat shielding pigment is normally gray when painted on a road (road surface), so it is preferable to use a black heat shielding pigment and a white pigment. The reflectance of the infrared ray can be measured using a commonly used method, for example, a spectrophotometer can be measured using a spectrophotometer, or measured through the spectroscopic reflectance and solar spectral energy values, The reflectance can be measured using a solar reflectance that can represent the reflection characteristic of a single figure.

Conventional microspheres are inorganic materials containing silicon dioxide (SiO ₂ ) as a main component, whereas plastic microspheres used in the present invention are cross-linked poly methacrylate cross polymers. As an organic material containing as a main component, it is dispersed in the heat-resisting resin, and serves to further prevent the heat from being accumulated on the road by reflecting far more infrared rays from outside such as sunlight than the inorganic material containing silicon dioxide as a main component.

The plastic microspheres have a density of 0.01 to 0.2 g / cc, preferably 0.05 to 0.1 g / cc. In addition, since the plastic microsphere includes pores therein and has excellent dispersibility, the plastic microsphere has excellent heat transfer resistance and low heat transmission. The content of the plastic microspheres is preferably 1 to 5% by weight based on the total heat shield coating composition.

The curing agent may not only be used as a curing agent to cure, but may adjust physical properties and the like according to a user's purpose, and may also play a role of crosslinking between the acrylic resin, the first monomer, and the SEBS resin. As the curing agent, benzoyl peroxide (BPO) is used, and when coating the paint, after coating, the curing agent through the addition reaction generated by forming a radical, the paint to harden to have the desired physical properties of the coating film Can be. The content of the curing agent is 1 to 5% by weight, preferably 2% by weight, based on the total heat shield coating composition.

The coating composition of the present invention may further include additives, for example, a dispersant, an antisettling agent, a white pigment, a mixture thereof, and the like, if necessary, and the content of the additive is 1 to 1 with respect to the total heat shielding coating composition. 5 parts by weight. The anti-settling agent prevents the infrared reflecting pigment and / or the plastic microsphere from settling to the bottom and, when the white pigment is added, may have a higher reflectance against external light, according to the present invention. The coating composition can be used more efficiently.

Although the physical properties of the coating composition according to the present invention may be appropriately selected and used as necessary, for example, the specific gravity at 25 ° C. is 1.6 to 1.9, preferably 1.7 to 1.8, and the viscosity at 25 ° C. is 15.000 with a B-type viscometer. To 30,000 Cps, preferably 20,000 to 25,000 Cps, and a pot life of 10 to 20 minutes, preferably 15 minutes at 25 ° C.

The heat-shielding coating composition for road pavement of the present invention lowers the temperature of the road surface by 5 to 15 ° C., preferably 8 to 12 ° C., thereby reducing heat island in the city and preventing road surface temperature increase in the city. Excellent adhesion, durability and abrasion resistance, fast curing, in particular characterized by excellent low-temperature curing in winter. In addition, it is possible to prevent heat accumulation of the road by reflecting infrared rays, and visible light has reflection characteristics similar to those of conventional paints, so that the road (road surface) has various colors (for example, dark gray, gray, blue, light green, Ivory, light brown, reddish brown, earthy color, etc.).

As the heat-shielding coating construction (packaging) method using the coating composition according to the present invention, a conventionally used road paving method can be used. For example, first, the road to be paved is subjected to surface treatment (polishing or cleaning). And adding and applying silica to a coating composition according to the present invention by a conventional road paving method .

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited by the following Examples.

Assessment Methods

1.Flexibility: To test the crack resistance, cold rolled steel sheet of 7 X 15Cm was washed with solvent, sanded with # 220 Sand Paper, coated with dry film thickness of 2.5mm, and cured. Flexibility test at 25 ℃, 0 ℃, -10 ℃ with mandrel to confirm the degree of cracking of coating

2. Slip resistance: measured with a British Pendulum Tester according to the SPS-KTS 1102-1890: 2017 standard for non-slip packaging.

3. Thermal insulation: Measure the thermal insulation by the “indoor survey method” established by the Japan Institute for Rising Pavement. (Asphalt is irradiated with an infrared specimen at 25cm height using a 150W infrared lamp in a constant temperature room. The temperature difference from the specimen

4. Abrasion rate: The wear rate is measured after abrasion resistance test (500,000 times) after applying heat-resistant packaging material to concrete specimens.

5. Brightness: Brightness measurement using Spectrophotometer

6. Curing time: Tested according to KSM 5000 test set-up 2511

7. Pot life: Measure the time when the heat-resistant packaging material loses flowability while stirring with a glass rod after mixing 2% by weight of the curing agent in 100G of the heat-resistant packaging material

Production Example 1 Manufacture of Heat Resistant Resin

25% by weight of solid acrylic resin (PMMA), 54% by weight of MMA, 5% by weight of TPGDA (Tripropylene glycol diacrylate), 15% by weight of SEBS Rubber, 1% by weight of WAX, and maintained at 50-55 ° C. for 50-70 minutes To prepare a resin.

Production Example 2 Manufacture of Heat Resistant Resin

A resin was prepared by combining 25% by weight of a solid acrylic resin (PMMA), 69% by weight of MMA, 5% by weight of tripropylene glycol diacrylate (TPGDA), and 1% by weight of WAX, and maintaining the temperature at 50 to 55 ° C. for 50 to 70 minutes.

Production Example 3 Manufacture of Heat Resistant Resin

25% by weight of solid acrylic resin (PMMA), 54% by weight of MMA, 5% by weight of TPGDA (Tripropylene glycol diacrylate), 15% by weight of SIS Rubber, 1% by weight of WAX, and maintained at 50-55 ° C. for 50-70 minutes To prepare a resin.

Production Example 4 Manufacture of Heat Resistant Resin

25% by weight of solid acrylic resin (PMMA), 59% by weight of MMA, 5% by weight of propylene glycol diacrylate (TPGDA), 10% by weight of SEBS Rubber, 1% by weight of WAX, and maintained at 50-55 ° C. for 50-70 minutes To prepare a resin.

[Example 1 and Comparative Examples 1 to 3] Preparation of heat shield coating composition

By referring to the following Table 1, to the heat-shielding resin prepared in Preparation Examples 1 to 4 was added to the anti-settling agent and stirred for about 10 minutes, while stirring, adding a white pigment, black heat shield pigment, calcium carbonate, silica After dispersing at 2500 rpm for about 30 minutes, plastic microspheres were then added with stirring and stirred at 1000 rpm for about 10 minutes to prepare the coating compositions of Examples 1 and Comparative Examples 1-4.

division Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Preparation Example 1 250 0 0 0 Preparation Example 2 0 250 0 0 Preparation Example 3 0 0 250 0 Preparation Example 4 0 0 0 250 Sedimentation inhibitors 2 2 2 2 White pigment 30 30 30 30 Black heat shield pigment 30 30 30 30 Calcium carbonate 225 225 225 225 Silica 454 454 454 454 Glass buble 0 5 5 5 Plastic
Microsphere 5 0 0 0 B. P. O Curing Agent 2 2 2 2 Sum 1000 1000 1000 1000

[Experimental Example 1] Comparison of physical properties (characteristics) of heat shielding coating composition

The coating composition properties (specific gravity, viscosity, pot life, curing time, lightness, wear resistance, slip resistance and shelf life) of Example 1 and Comparative Examples 1 to 3 prepared above were evaluated, and the results are shown in Table 2 below.

division Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Specific gravity (25 ℃) 1.85 1.83 1.84 1.82 Viscosity (25 ° C, CPS) 24,000 21,000 23,000 22,000 Pot life (25 ℃) 10 minutes 11 minutes 13 minutes 15 minutes Curing time (25 ℃) 20 minutes 21 minutes 22 minutes 23 minutes Brightness (Y) 45 43 44 44 Wear resistance (wear rate,%) 0.1 0.2 0.2 0.2 Slip Resistance (BPN) 62 64 65 63 Zhejiang (25 ℃) Good Good Good Good

[Experimental Example 2] Comparison of heat shielding properties of heat shielding coating compositions

The thermal insulation properties of the coating compositions of Comparative Example 1 and Example 1 prepared above were evaluated, and the results are shown in Table 3 below.

division Asphalt specimen temperature (℃): A Temperature (° C) of the specimen coated in Comparative Example 1:  Temperature (° C) of the specimen coated in Example 1: C Temperature difference
(BA) Temperature difference
(CA) Early 25 25 25 0 0 10 minutes later 35 30 28 5 7 20 minutes later 47 35 33 12 14 30 minutes later 57 40 38 17 19 After 40 minutes 61 42 40 19 21 50 minutes later 66 44 42 22 24 60 minutes later 70 46 44 24 26

Referring to Table 3 above, it can be seen that the temperature difference of the sample coated in Example 1 is significantly larger than the temperature difference of the sample coated in Comparative Example 1. Therefore, it can be seen that the heat shielding property for Example 1 is more excellent.

Experimental Example 3 Comparison of Flexibility of Heat-Resistant Coating Composition

Flexibility of the coating compositions of Example 1 and Comparative Examples 1 to 3 prepared above were evaluated, and the results are shown in Table 4 below.

division 25 ℃  0 ℃ -10 ℃ Example 1     ◎     ◎    ◎ Comparative Example 1     ◎     △    × Comparative Example 2     ◎     ◎    ○ Comparative Example 3     ◎     ◎    △

◎: no crack ○: fine crack Δ: normal crack ×: large crack

Referring to Table 4 above, it can be seen that the Examples including the SEBS resin and the Plastic Microsphere have excellent results in the evaluation of the flexibility regardless of the temperature, compared to the Comparative Example.

Claims (6)

(a) 20 to 30% by weight of an acrylic resin having a weight average molecular weight of 40,000 to 60,000, (b) a first monomer 50 to 70 consisting of an acrylate having an alkyl group having 3 to 6 carbon atoms containing one or two oxygen atoms Heat-resisting resin comprising 5-15 wt% of SEBS (styrene ethylene butylene styrene) resin having a weight average molecular weight of 50,000 to 70,000 and a hardness of Shore A having a weight average molecular weight of 50,000 to 70,000 and an elongation of 600% or more;
1 to 10% by weight of a black infrared reflecting pigment dispersed in the heat shielding resin and having an infrared reflectance of 45% or more:
Plastic microspheres dispersed in the heat-resisting resin and having a specific gravity of 0.01 to 0.2 g / cc, pores formed therein, crosslinked polyacrylate resin, and reflecting infrared rays 1 to 5 weight percent; And
1 to 5% by weight of a benzoyl peroxide as a curing agent,
A heat-shielding coating composition for road surface packaging having a specific gravity of 1.6 to 1.9 at 25 ° C., a viscosity of 15.000 to 30,000 Cps, and a pot life of 10 to 20 minutes. The method of claim 1, wherein the first monomer is methyl methacrylate (Methylmethaacrylate), tripropylene glycol diacrylate (TripropyleneGlycoldiacrylate), 2-ethylhexyl acrylate (2-Ethylhexylacrylate), hydropropyl methacrylate (HydropropylMethacrylate) and The heat shield coating composition which is selected from the group consisting of these. The heat shield coating composition according to claim 1, wherein the heat shield coating composition further comprises an additive selected from the group consisting of a dispersant, an antisettling agent, an antifoaming agent, a white pigment, and a mixture thereof. The heat shield coating composition according to claim 3, wherein the content of the additive is 1 to 5 wt% based on the total composition. The heat shield coating composition according to claim 1, wherein the heat shield coating composition lowers the temperature of the road surface by 5 to 15 ° C. delete

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