KR102507163B1 - Top coat for parking lot floor - Google Patents

Abstract

The surface coating agent and surface coating method for a parking lot floor of the present invention include a first step of coating a polyurethane prepolymer with a coating film thickness of 40 to 60 μm to form an undercoat layer; A second step of forming a high-hardness polyurethane intermediate layer having excellent impact resistance and adhesiveness thereon to a film thickness of 1 to 3 mm at room temperature; A third step system coating method of forming a top coat layer with a coating film thickness of 50 to 100 μm having excellent thermal insulation performance and weather resistance while including abrasion resistance and anti-slip function using a silicone acrylic resin composition.

Description

Top coat for parking lot floor {Top coat for parking lot floor}

The present invention relates to a coating agent for a parking lot floor and a method for manufacturing the same, and more particularly, to a top coat coating agent for a parking lot floor and a method for manufacturing the same.

A urethane floor coating layer is applied to protect the parking lot floor from vehicles. The urethane coating layer consists of an undercoating layer coated with a thin film on the surface of the parking lot, a middle coating layer of a thick film, and a top coating layer.

In general, the top coat layer is an undercoat layer with excellent tensile and elongation to prevent damage to the coating film due to adhesion to the floor or contraction, expansion, or cracking of the floor, or a middle layer of thick film with high hardness to withstand the load on the top. Unlike, it is in charge of design elements such as gloss and / or color, and is often made of a normal epoxy or urethane coating film.

However, as parking lot repairs due to damage to the top coat increase, attempts have been made to increase the convenience of maintenance of the parking lot floor by protecting the top coat or improving the top coat.

Korean Patent No. 2069038 granted to Kim Woo-young discloses a parking lot floor coating film consisting of a urethane primer layer, a polyurea-based ultra-hard thick film intermediate layer, and a top coat layer consisting of a urethane-based top coating material on the upper surface of the construction surface, A method of further forming a protective film composed of a permeation layer, a heating layer, and a protective layer is disclosed.

Korean Patent No. 1418863 granted to PNTEC Engineering Co., Ltd. discloses a coating layer having a top coating layer containing silica sand and MMA-based resin as main raw materials.

However, there is a continuing demand for a new top coat with excellent scratch resistance, UV resistance, high gloss, anti-slip, wear resistance, and the like.

An object to be solved in the present invention is to provide a coating agent for top coating capable of forming a parking lot floor with excellent scratch, UV, gloss, and anti-slip properties.

An object to be solved by the present invention is to provide a method for producing a coating agent for top coating capable of forming a parking lot floor with excellent scratch, UV, gloss, and anti-slip properties.

Another problem to be solved by the present invention is to provide a parking lot floor having a top coat having excellent scratch, UV, gloss, and anti-slip properties.

Another problem to be solved by the present invention is to provide a method for constructing a parking lot floor having a top coat having excellent scratch, UV, gloss, and anti-slip properties.

In order to solve the above problems, the present invention

Provided is a coating agent for a top coat for a parking lot floor, characterized in that it comprises a silicone acrylic resin containing a hydroxyl group and non-yellowing polyisocyanate.

In the present invention, the silicone acrylic resin containing the hydroxyl group and the non-yellowing polyisocyanate form a silicone acrylic urethane coating film by copolymerization.

Although not limited theoretically, the silicone acrylic resin containing a hydroxyl group of the present invention introduces a silicone monomer to exhibit excellent gloss and scratch resistance and high weather resistance, while using an acrylic or methacrylic monomer having an aliphatic group. Adhesion is increased by adjusting the glass transition temperature, introducing a methacrylic monomer having a hydroxyl group, and increasing the crosslinking density by crosslinking with non-yellowing polyisocyanate to improve drying speed, surface hardness, solvent resistance, etc. It becomes possible to give

In the present invention, the silicone acrylic resin containing a hydroxyl group contains 10 to 30% by weight of a silicone-containing monomer, 60 to 85% by weight of an acrylic or methacrylic monomer having an aliphatic group, and 5 to 10% by weight of a methacrylic monomer having a hydroxyl group. can be made with

In the present invention, the silicone-containing monomer is used to exhibit excellent gloss, scratch resistance and high weatherability of the coating film, and may be a silicone-containing monomer, although not limited thereto, and is represented by Formula (1): 1 There may be more than one species.

(1)

(One)

In the present invention, when the content of the silicone-containing monomer is too low, weather resistance is poor, and when it is relatively high, price increase, hardening of the coating film, and storage stability may be poor.

In the present invention, the acrylic or methacrylic monomer having an aliphatic group is used to adjust the hardness of the coating film by adjusting the glass transition temperature and to impart gloss and smoothness. Examples include, but are not limited to, normal butyl acrylate, 2-ethylhexyl acrylate, ethyl acrylate, normal butyl methacrylate, normal propyl methacrylate, methyl methacrylate, ethyl methacrylate, 2-ethylhexyl methacrylate, octyl methacrylate, glycidyl methacrylate acrylate, lauryl methacrylate, isobornyl methacrylate, or a mixture of two or more thereof.

In the present invention, the methacrylic monomer having a hydroxyl group is used to improve the hardness of the coating film and the adhesion to the object to be coated, but is not limited to, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate rate, 4-hydroxybutyl methacrylate, or a mixture of two or more thereof may be used. Methacrylic monomers containing hydroxyl groups have a problem in that viscosity increases when used in excess.

In the present invention, the silicone acrylic resin containing the hydroxyl group may have a glass transition temperature of 0 ° C. or higher, preferably 0 to 50 ° C., so as to form a high-quality top coat layer. may have a glass transition temperature of 20 to 40 °C, most preferably 25 to 35 °C.

In the present invention, the non-yellowing polyisocyanate constituting the silicone acrylic urethane means an aliphatic polyisocyanate, and preferably has an NCO % of 10 or more, preferably 15 or more, more preferably 20 or more.

In the present invention, the non-yellowing polyisocyanate may be non-yellowing polyisocyanate of the AH series of Bayer of Germany and Aekyung Chemical of Korea. In the practice of the present invention, Desmodur N-3300 (NCO = 23%) from Bayer, Germany was used as the non-yellowing polyisocyanate used as a fire agent.

In the practice of the present invention, it is preferable to use an equivalent ratio of NCO/OH of 1/1 for the amount of the curing agent in consideration of the hydroxyl group of the silicone acrylic resin. If the hydroxyl group or isocyanate group of the silicone acrylic resin does not participate in the crosslinking reaction and remains, dense crosslinking may not be achieved, resulting in a decrease in physical properties of the coating film.

In the present invention, the coating agent for top coating may include 20 to 50 parts by weight of silicone acrylic urethane, preferably 25 to 45 parts by weight, more preferably 30 to 40 parts by weight, based on 100 parts by weight of the coating agent. there is. If the content of the silicone acrylic urethane is small, it is difficult to form a solid top coat film, and if the content of the silicone acrylic urethane is large, the content of the solvent or other components is reduced, making it difficult to form a coating film with appropriate characteristics.

In the present invention, the coating agent for top coating may further include potassium titanate to impart anti-slip properties and wear resistance. The potassium titanate is a functional material of various sizes and shapes and is represented by K ₂ O·nTiO ₂ , and the n value in the formula can be expressed as 1, 2, 4, 6, or 8. Among them, when n is 2, 4, 6, or 8, all potassium titanate becomes crystalline fiber, and shape control is possible by addition of Mg, etc. In particular, potassium hexatitanate has chemical stability, abrasion resistance, thermal stability, It has excellent performance such as infrared reflection and insulation resistance, so it can be used as a reinforcing material for metals, plastics, ceramics, etc., and is widely used as a friction-resistant material.

In the present invention, it is preferable that the potassium titanate is 9 to 30 parts by weight based on 100 parts by weight of the top coat coating agent. When the content of potassium titanate is less than 9 parts by weight, slip resistance and abrasion resistance in the final coating film are deteriorated, and when it is greater than 30 parts by weight, dispersibility deteriorates, making painting difficult. Potassium titanate preferably has an average particle size of 25 to 75 μm, and the shape of potassium titanate is plate, rod, needle, whisker, etc., among which one or more may be used.

In the present invention, the coating agent for the top coat may further include a heat shielding pigment for heat shielding of the top coat layer. The heat-shielding pigment is ceramic spheres that reflect more than 90% of the wavelength of 300 ~ 2,500 nm, which is a near-infrared wavelength region, and absorb and dissipate thermal energy by generating ceramic bubbles in the coating film after drying to block thermal energy conduction. desirable. The ceramic sphere is made of ceramic in the form of a non-porous sphere having a size of 4 to 10 micrometers, and performs a heat reflection function to prevent light from being converted into thermal energy by the ceramic sphere, thereby exhibiting heat shielding performance. do.

In the present invention, the heat-shielding pigment is preferably 5 to 15 parts by weight, more preferably 7 to 12 parts by weight, based on 100 parts by weight of the top coat coating agent. If the content of the heat-shielding pigment is less than 5 parts by weight, it is difficult to exhibit the required insulation performance, and if it exceeds 15 parts by weight, other physical properties are maintained, but there is a problem in that adhesion with the intermediate layer coating film is lowered.

In the present invention, the coating agent for the top coat may further include a metallic inorganic heat-dissipating pigment having heat-dissipating properties for synergy with the heat-shielding pigment. The radiation pigments include titanium oxide, zinc oxide, indium oxide, tin oxide, antimony tin oxide, indium tin oxide, molybdenum oxide (MoO3), tantalum oxide (Ta2O5), and vanadium pentoxide (V2O5). ), niobium oxide (Nb2O5), boron nitronite (BN), hexagonal boron nitride (h-BN), and aluminum oxide (AL2O3).

In a preferred embodiment of the present invention, among inorganic radiation pigments, hexagonal boron nitride (hereinafter referred to as h-BN) is a material having a two-dimensional structure, consisting of a hexagonal arrangement of boron atoms and nitrogen atoms, It has electrical insulating properties due to a large band gap of about 5.9 eV and corresponds to a physically and mechanically stable material. Crystals of h-BN have a hexagonal layered structure similar to graphite, form very hard bonds, and have lubricity. In addition, the h-BN sheet is a covalent bonding material of an element with a low atomic number and has high thermal conductivity. It does not have a melting point and sublimes at about 3,000 ° C, so it has high stability at high temperatures and has a very high electrical resistance, so it can withstand high temperatures exceeding 1,000 ° C. It has a resistance of 105 Ω, has a very stable hexagonal bond, so it has high chemical stability, and its true specific gravity is 2.26, which is very low among ceramics, so it can lead to weight reduction of parts such as aircraft and space materials. Such h-BN is separated and used by using a mechanical exfoliation method after forming a bulk type structure, and the quality is excellent, but the size is only 5 μm or less.

In the present invention, the heat-dissipating pigment is preferably 1 to 15 parts by weight based on 100 parts by weight of the top coat coating agent. If it is less than 1 part by weight, it is difficult to exert the required synergistic effect, and if it exceeds 15 parts by weight, it may affect other physical properties and maintain heat shielding performance, but the adhesion of the coating film may deteriorate and the cost may increase.

In the present invention, the coating agent for top coating may include a solvent to form a uniform coating composition. The solvents used in the present invention are aromatic hydrocarbons such as toluene and xylene, esters such as normal butyl acetate and ethylene glycol ethyl ether acetate, ketones such as methyl isobutyl ketone and methyl normal amyl ketone, isopropanol, normal butanol, and isopropanol. Alcohols such as butanol and glycol ethers such as ethylene glycol monomethyl ether and propylene glycol monomethyl ether can be used, and these solvents can be used alone or in combination in consideration of the effect of the reaction temperature on the molecular weight and final viscosity of the synthetic resin. Considering the synthesis temperature, solubility parameter, evaporation rate, etc., it is preferable to synthesize using a solvent having a boiling point of 100 to 160 ° C, suitably having a boiling point in the range of 110 to 150 ° C.

In the present invention, the solvent may be 10 to 40 parts by weight, preferably 15 to 35 parts by weight, based on 100 parts by weight of the top coating agent. If the content of the solvent is small, it is not easy to form a uniform thin film, and if the content of the solvent is high, it is difficult to form a film of a predetermined thickness, and many organic solvents are released.

In the present invention, the coating agent for top coating may include conventional additives such as an antifoaming agent or a leveling agent in order to form a uniform coating film. The additive may form 1 to 5 parts by weight based on 100 parts by weight of the top coat coating agent.

In one aspect, the present invention

A method for preparing a top coat coating agent by preparing a silicone acrylic resin containing a hydroxyl group through solution polymerization and mixing the silicone acrylic resin solution with non-yellowing polyisocinate, potassium titanate, heat shielding pigment, heat radiation pigment, and additives to provide.

In the present invention, the silicone acrylic resin containing a hydroxyl group may be prepared by radical polymerization of monomers having a vinyl-type double bond using a thermal decomposition initiator, and the radical polymerization may use a solution polymerization method.

In the practice of the present invention, the silicone acrylic resin containing a hydroxyl group is 10 to 30 parts by weight of a silicone monomer, 60 to 85 parts by weight of an acrylic or methacrylic monomer having an aliphatic group, and 5 to 10 parts by weight of a methacrylic monomer having a hydroxyl group. 100 parts by weight of the monomer and 1 to 3 parts by weight of the reaction initiator are added dropwise to a medium boiling point solvent for 3 to 5 hours and polymerized at a temperature of 80 to 100 ° C. for 8 to 12 hours, so that the number average molecular weight of the resin composition is 16,000 to 20,000. , It is provided as a silicone acrylic resin composition having a glass transition temperature of +30 ℃, a viscosity in the range of 5 to 15 cPs, and a solid content concentration of 50%.

In the present invention, as the radical polymerization initiator used in the polymerization, benzoyl peroxide, tert-butyl peroxybenzoate, tert-butyl peroxy-2-ethylhexanoate, tert-butyl peroxy-2-ethylhexanoate, Eight, azobisisobutyronitrile, etc. are mentioned. These radical polymerization initiators can be used alone or in combination of two or more. The amount of the initiator used is 1 to 3 parts by weight based on the total weight of the monomer composition, preferably 1 to 2 parts by weight. If the content of the radical initiator is too small, the viscosity and molecular weight increase, resulting in thread drag, resulting in poor spray workability.

In the present invention, the method for synthesizing the resin composition is a mixed solution containing the above-listed monomers and an initiator is added to the solvent solution in the reactor at a uniform rate for 3 to 5 hours, while dropping, at a temperature of 80 to 100 ° C. Allow to polymerize for ~12 hours. As described above, by stably inducing the reaction conditions, it is possible to obtain a silicone-containing acrylic resin composition having excellent gloss, good smoothness, and good scratch resistance.

In one aspect, the present invention

A primer undercoating layer formed on the surface of the base layer;

an intermediate layer formed on the surface of the lower coating layer; and

Consisting of a top coat layer formed on the surface of the middle coat layer,

The top coat layer provides a coating film for a parking lot floor, characterized in that it comprises a silicone acrylic urethane resin.

In the present invention, the top coat layer may be coated with a top coat coating agent to have a thickness of 50 to 100 μm to form a top coat layer having excellent anti-slip and abrasion resistance and excellent heat shielding performance and weather resistance.

In one aspect, the present invention

Forming a primer undercoating layer coated on the parking lot floor;

forming a thick intermediate layer on the primer undercoat layer; and

Forming a top coat layer with a coating agent containing silicone acrylic urethane on the middle layer of the thick film; provides a coating film construction method for a parking lot floor including.

In the practice of the present invention, the coating film construction method for the parking lot floor comprises the steps of coating a polyurethane prepolymer to a coating film thickness of 40 to 60 μm to form an undercoat layer; Forming a high-hardness polyurethane intermediate layer having excellent impact resistance and adhesiveness thereon to a film thickness of 1 to 3 mm at room temperature; A step of forming a top coat layer having a coating film thickness of 50 to 100 μm including a silicone acrylic resin composition and having abrasion resistance and anti-slip function and excellent heat shielding performance and weather resistance may be included.

In the present invention, as the polyurethane prepolymer for forming the undercoat layer (primer), one prepared by a conventional method may be used, and in one embodiment, crude MDI (4,4'-Diphenylmethane Diisocyanate, functional group = 2.7, Molecular weight: 340) and PPG-400 (Polypropylene Glycol, functional group = 2, molecular weight: 400) are used to prepare and use a polyurethane prepolymer with NCO (%) = 7.0, and the polyurethane prepolymer prepared in this way is usually added. After adding and mixing an antifoaming agent, a moisture absorbent, a solvent, etc., and stirring, 0.1% by weight of dibutyl tin dilaurate (DBTDL) is mixed and used as a reaction catalyst to prepare a primer.

In one embodiment of the present invention, the undercoat layer is 15 parts by weight of toluene, 40 parts by weight of crude MDI (4,4'-diphenylmethane diisocyanate), and 0.02 parts by weight of DBTDL ( Din- butyltindilaurate) as a reaction catalyst in a four-neck flask After heating and stirring, 25 parts by weight of PP-400 (Polypropylene Glycol, functional group = 2, molecular weight 400) is added to 25 parts by weight of toluene, and the mixed solution is slowly added to mucus for 2 hours. After that, the reaction temperature was raised to 857 ± 3 ℃ over 1 hour, and the reaction was further reacted at the same temperature for 4 hours. ) was prepared.

50 parts by weight of the polyurethane prepolymer, 5 parts by weight of ethyl acetate, 2.5 parts by weight of Additive TI (Bayer Co.) as a moisture absorbent, 1.5 parts by weight of Anti-Terra-U (BYK-Chemi) as a dispersant, After mixing 35 parts by weight of the extender pigment Talc, stirring for 30 minutes, dispersing with an Attrition mill so that the particle size is 5 or more in NS (North Standard Graduations) units, and then adding defoamer BYK-066N (BYK-Chemie) 0.3 Part by weight, 0.5 part by weight of flow regulator BYK-410 (BYK-Chemie), and 5 parts by weight of mixed solvent were added, followed by stirring for 30 minutes to prepare a primer coating agent according to the present invention.

The prepared primer coating agent can form a primer coating layer by adding and mixing DBTDL, which is a reaction catalyst, in an amount of 0.1% by weight based on the total composition during coating.

At this time, it is preferable that the primer using the polyurethane prepolymer has a thickness of 40 to 60 μm when coated on the concrete structure. This is because when the thickness of the coating film is less than 40 ㎛, the adhesive strength with the concrete structure to be coated is lowered, and the bonding force with the polyurethane middle layer attached to the upper layer is insufficient, which may cause lifting in the middle. This is because the drying time is long and the workability is poor.

The polyurethane prepolymer is coated with a roller or spray method using a catalyst, cured and dried at room temperature for 30 minutes to 1 hour, and then immediately applied with a polyurethane intermediate coating, which is the next step, to obtain a high hardness intermediate coating having excellent impact resistance and adhesion. to form layers.

In the present invention, the middle layer is then coated on the upper layer of the polyurethane prepolymer, and the high-hardness polyurethane middle coating agent has a hardness of Shore A 90 or more, and it is suitable to coat it with 1 to 3 mm. This is because if the hardness is low, it cannot withstand the compressive load of the upper layer. In addition, when the thickness of the high-hardness polyurethane coating agent is 1 mm or less, structural stability and abrasion resistance are deteriorated because it cannot withstand the compressive load by the vehicle applied from the top. Conversely, when the thickness of the polyurethane coating agent is 3 mm or more, durability and Although the abrasion resistance is good, it is difficult to form a uniform surface, and bubbles are generated, resulting in a decrease in abrasion resistance, a delay in drying time, and a high construction cost.

The high-hardness polyurethane intermediate coating agent is coated using a catalyst and a trowel or dedicated trash, and cured and dried within 24 hours at room temperature, followed by top coat coating, which is the next step.

In one embodiment of the present invention, the intermediate coating agent is added to 35 parts by weight of TDI-80 (Toluene Diisocyanate) and 0.03 parts by weight of Benzoyl Chloride as a reaction stabilizer in a 4-necked flask, heated to 27 ± 3 ° C. while stirring, and then, here In PP-400 (Polypropylene Glycol, functional group = 2, molecular weight 400) 30 parts by weight, GP-280 (Polypropylene Glycol, functional group = 3, molecular weight 280) 10 parts by weight, GP-3000 (Polypropylene Glycol, functional group = 3, molecular weight 3000 ) 25 parts by weight of the mixed solution was uniformly mucilaged for 3 hours, the reaction temperature was raised to 88 ± 3 ° C over 1 hour, the reaction was further reacted at the same temperature for 4 hours, and the reaction was terminated to obtain an isocyanate prepolymer (100% solid content). , Color (Gardner) 4, NCO (%) = 9.0) was prepared, and the isocyanate prepolymer thus prepared was used as a curing agent for a high-hardness polyurethane intermediate coating.

Separately, 30 parts by weight of calcium carbonate, 15 parts by weight of Talc, 8 parts by weight of BaSO ₄ and 5 parts by weight of a polyether polyol (GP-4000) having a functional group number of 3 and a molecular weight of 4000 and a phosphorus-based flame retardant tris (2,4-dichloropropyl) ) Mix 5 parts by weight of phosphate and 2 parts by weight of antibacterial agent BIT, stir for 30 minutes, disperse with an Attrition Mill so that the particle size is 5 or more in NS (North Standard Graduations) units, and then add antifoaming agent BYK-066N After adding 0.3 parts by weight of (BYK-Chemie) and 0.5 parts by weight of a flow control agent BYK-410 (BYK-Chemie), the mixture was further stirred for 30 minutes to make a polyurethane intermediate coating agent.

When mixing the NCO / OH equivalent ratio of the prepared main agent and the curing agent at 1/1 and using DBTDL as a catalyst in an amount of 0.1% by weight based on the total composition, a high hardness polyurethane intermediate layer having Shore A 90 or higher can be formed.

The surface coating agent and surface coating method for a parking lot floor of the present invention include a first step of coating a polyurethane prepolymer with a coating film thickness of 40 to 60 μm to form an undercoat layer; A second step of forming a high-hardness polyurethane intermediate layer having excellent impact resistance and adhesiveness thereon to a film thickness of 1 to 3 mm at room temperature; Parking lot floor of KS F 4937 using the third-stage system coating method to form a top coat layer with a coating film thickness of 50 ~ 100 ㎛ that has excellent heat insulation performance and weather resistance, including abrasion resistance and anti-slip function using a silicone acrylate resin composition It is a useful invention that can contribute to environmental protection by ensuring long-term durability of concrete structures because it satisfies all test items of surface finishing materials for use.

Hereinafter, the present invention will be described in detail through examples. The following examples are intended to illustrate the present invention and are not intended to limit the present invention.

Examples 1-3 and Comparative Example 1

After putting 140 g of xylene and 60 g of normal butanol in a four-necked flask equipped with a thermometer, condenser, dropping funnel, and stirrer, the mixture was substituted with nitrogen gas and heated to 90° C. while stirring. Thereafter, while maintaining the temperature of the solvent constant, a mixed solution of 4 g of azobisisobutyronitrile as the following monomer and initiator was added dropwise over 3 to 5 hours at a uniform rate. After completion of the dropping, it is further aged for 3 hours, and then, as a post-addition initiator, 0.5 g of azobisisobutyronitrile is dissolved in 50 g of xylene, added dropwise over 30 minutes, and further stirred for 3 hours to complete the reaction by removing unreacted monomers. Then, 86.8 g of xylene and 58.7 g of normal butanol were added and diluted to obtain a silicon-containing acrylic resin having a glass transition temperature of 30 °C and a solid content of 50%.

normal butyl acrylate Methyl methacrylate normal butyl methacrylate 2-hydroxyethyl methacrylate 3-methacryloxypropyltrimethoxysilane viscosity
(cPs) number average
Molecular Weight polydispersity
(Mw/Mn) Non-volatile content
(%) Experimental Example 1 70.3 159.7 80 10 80 6.27 18000 2.0 49.5 Experimental Example 2 88 172 80 40 20 10.7 17700 2.1 49.8 Experimental Example 3 64 136 80 40 80 12.9 17600 2.1 49.6 Comparative Example 1 96 184 80 40 - 8.84 17700 2.0 49.7

Evaluation of physical properties of coating film

In order to examine the properties of the coating film formed from the composition containing the (silicone) acrylic resin of the above (Experimental Examples 1 to 3) and Comparative Example 1, as shown in Table 1 below, the subject using the (silicone) acrylic resin and the curing agent are non-yellowing poly A (silicone) acrylic/urethane white paint was prepared using Desmodur N-3300 from Bayer, an isocyanate, at an equivalent ratio of NCO/OH of 1/1.

The coating film performance test specimen was prepared as follows.

First, the surface of the concrete was cleaned, and then sprayed with a polyurethane prepolymer as a primer to a dry film thickness (DFT) of 50 μm, dried naturally, and then a high-hardness polyurethane coating agent was applied with a film thickness of 3 mm and dried. After naturally drying for 1 day, the top coat coating agent prepared by the above formulation was spray-coated with DFT 75 μm and naturally dried for 7 days to obtain a test film, and then the coating film performance was investigated and shown in Table 2.

NO. ingredient Example 1 Example 2 Example 3 comparative example characteristic Hado
(thickness 50㎛) Polyurethane
prepolymer 40 40 40 40 synthetic
Solids 67%, NCO=7% solvent 59.2 59.2 59.2 59.2 MIXTURE additive 0.7 0.7 0.7 0.7 Antifoaming agent, moisture absorbent, etc. curing catalyst 0.1 0.1 0.1 0.1 DBTDL total 100 100 100 100 half way
(Thickness 3mm) high hardness polyurethane
(subject/curing agent) 63 63 63 63 Composite (hardener)
NCO/OH=1/1 chain extender 10 10 10 10 UNILINK 4200 (N,N'-Dialkylamino-diphenylmethane) from UOP, USA color pigment 3 3 3 3 Chrome oxide green GX from Bayer Chemicals, Germany extender pigment 23.9 23.9 23.9 23.9 calcium carbonate curing catalyst 0.1 0.1 0.1 0.1 DBTDL total 100 100 100 100 highway
(thickness 75㎛) (silicone) acrylic /
Urethane (subject/curing agent) Experimental Example 1
35 Experimental Example 2 35 Experimental Example 3 35 Comparative Example 1 35 synthetics (subject)
NCO/OH=1/1 solvent 28 23 18 40 MIXTURE additive 3 3 3 3 Defoaming agent, leveling agent, etc. titanium dioxide 12 12 12 22 DuPont R-706 6 Potassium titanate 10 15 20 - Japan Otsuka Terracess DSA heat shield
pigment ceramic
spear 10 8 6 - American Zeeospheres
Microspheres
G-600 hexagonal system
boron nitride 2 4 6 - Japan Denka Company Ltd., SP-2 total 100 100 100 100

The coating film performance test was evaluated according to the general coating film property evaluation method as follows.

1. The wheel load resistance performance test was evaluated 80,000 times at a vertical load of 300 kg and a running speed of 5 km/h according to the test method of surface finishing materials for parking lot floors in KS F 4937 to measure the thickness reduction depth.

2. Slip resistance test

In the slip resistance test, the slip resistance index (BPN) was evaluated using a slip resistance tester (BPT, british pendulum tester) according to the slip resistance test method of the road surface of KS F 2375.

3. For heat insulation, the specimen coated on the steel plate (300mm X 300mm X 0.5mm) is made of Styrofoam material so that outside air does not flow into the roof of the model house (250mm X 250mm X 150mm), which has an open roof. seal it up An infrared lamp (Osram, E27 screw base, 250W) was irradiated for 30 minutes at a height of 30 cm above the test piece, and the temperature inside the roof and inside the room was measured with a digital temperature sensor (OMEGA, Model HH21) for each time period. The relative thermal insulation performance is measured as a temperature difference. At this time, these thermal insulation performance measurement devices are installed in an enclosed place.

4. For solar radiation reflectance measurement, according to KSM 5987, the solar radiation reflectance measurement method of heat-shielding paint, a specimen coated on a glass substrate with a width and length of 20cm X 30cm and a thickness of 3.0mm was measured using a UV Visible spectro photometer (spectrophotometer, Jasco Solar radiation reflectance was measured using V-670, wavelength 250 ~ 2500 nm).

5. Accelerated weathering test

The accelerated weathering test is performed according to the accelerated weathering test method of paints in KS M 5000-3231, using a sunshine weather-Ometer (Atlas Electric Devices Co., Ci65A type) to measure the gloss retention value and color difference at 1,000, 2,000, and 3,000 time intervals. evaluated.

(1) Measurement of gloss retention value

The gloss retention value was calculated by the following formula using a Glossmeter (Pacific Scientific Co., Glossgard Type II).

(2) Color difference measurement

Color difference is the difference between two colors expressed as a numerical concept in a visual concept. That is, the geometric distance between the two colors is expressed as a numerical value in the color space coordinates. It was measured using a Spectro Color Meter (Nippon Denshoku Kogyo Co., SZ-∑80 type), a diffuse reflectance measuring device, and the color difference was calculated by the formula below.

Color difference (ΔE) = [ (ΔL) ² + (Δa) ² + (Δb) ² ] ^1/

Where, L = lightness index of Hunter color indicator

a , b = chromaticity coefficient of the Hunter colorimeter

Test Items Example 1 Example 2 Example 3 comparative example Wheel load resistance performance (thickness reduction depth) mm 1.0 0.7 0.3 5.2 Slip Resistance (BPN) 49 57 61 31 heat shielding roof surface temperature
(℃) Before irradiation 26.4 26.5 26.4 26.5 after investigation 48.7 47.4 46.9 57.2 Temperature difference (Δ℃) 22.3 20.9 20.5 30.7 room temperature
(℃) before irradiation 26.4 26.5 26.4 26.5 after investigation 34.1 33.8 33.1 38.6 Temperature difference (Δ℃) 7.7 7.3 6.7 12.1 Solar radiation reflectance (%) 63.3 68.4 71.9 31.2 accelerated weathering 1000
(hrs) Gloss retention value (%) 98 98 100 82 Color difference (ΔE) 0.22 0.31 0.32 0.68 2000
(hrs) Gloss retention value (%) 85 74 92 52 Color difference (ΔE) 0.38 0.50 0.39 1.89 3000
(hrs) Gloss retention value (%) 80 71 86 34 Color difference (ΔE) 0.53 0.91 0.49 2.98

As shown in Table 3, when the composition of Comparative Example was used compared to the composition of Examples 1 to 3 of the present invention, the wheel load resistance performance and slip resistance were poor, and the content of potassium hexatitanate was high. Example 3 This gave the best results.

It can also be seen from the results of the heat shielding properties and the solar radiation reflectance that the roof surface temperature difference and the indoor temperature difference for 30 minutes were larger and the solar radiation reflectance was lower when the composition of the comparative example was used. Based on the above results, it can be seen that the heat shielding performance is excellent when the heat shielding pigment of the Example composition and the metallic inorganic pigment for heat dissipation are used together. In addition, in solar radiation reflectance, it was confirmed that the coating films formed on the compositions of Examples 1 to 3 had a solar radiation reflectance of 60% or more and had an excellent effect on solar light reflection.

As for the weatherability, the compositions of Examples 1 to 3 in which the silicone monomer was introduced (Experimental Examples 1 to 3) showed excellent weather resistance in terms of gloss retention value and color difference when compared with Comparative Examples, but in the case of Comparative Examples without using the silicone monomer showed a poor gloss retention value and noticeable color difference. In Examples 1 to 3, it was confirmed that Examples 1 and 3 having a high silicone monomer content had better weatherability.

Those skilled in the art in the field to which the present invention pertains will be able to make various applications and modifications within the scope of the present invention based on the above information. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be determined by the claims.

Claims (23)

A coating agent containing a silicone acrylic resin containing a hydroxyl group and non-yellowing polyisocyanate,
Here, the coating agent includes a silicone acrylic resin containing a hydroxyl group, 20 to 50 parts by weight of non-yellowing polyisocyanate, 9 to 30 parts by weight of potassium titanate, 5 to 15 parts by weight of a heat shielding pigment, 1 to 15 parts by weight of a heat radiating pigment, and 10 to 10 parts by weight of a solvent. 40 parts by weight, and 1 to 5 parts by weight of additives, characterized in that the coating agent for the top coating for the parking lot floor. According to claim 1,
A coating agent for top coating for a parking lot floor, characterized in that a silicone acrylic resin containing a hydroxyl group and non-yellowing polyisocyanate form a resin for a coating film through a urethane reaction. According to claim 1,
The silicone acrylic resin containing a hydroxyl group is composed of 10 to 30% by weight of a silicone-containing monomer, 60 to 85% by weight of an acrylic or methacrylic monomer having an aliphatic group, and 5 to 10% by weight of a methacrylic monomer having a hydroxyl group. Coating agent for top coating for parking lot floors made with According to claim 3,
The silicone-containing monomer is a coating agent for a top coat for a parking lot floor, characterized in that at least one selected from the following formula (1).

(One) According to claim 3,
Acrylic or methacrylic monomers having an aliphatic group include normal butyl acrylate, 2-ethylhexyl acrylate, ethyl acrylate, normal butyl methacrylate, normal propyl methacrylate, methyl methacrylate, ethyl methacrylate, 2- A coating agent for a top coat for a parking lot floor, characterized in that at least one selected from the group consisting of ethylhexyl methacrylate, octyl methacrylate, glycidyl methacrylate, lauryl methacrylate, and isobornyl methacrylate. According to claim 3,
The methacrylic monomer having a hydroxyl group is a coating agent for parking lot floors, characterized in that at least one is selected from 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, and 4-hydroxybutyl methacrylate. . According to claim 1 or 2,
The silicone acrylic resin containing the hydroxyl group has a glass transition temperature of 0 to 50 ° C. According to claim 1 or 2,
The non-yellowing polyisocyanate is an aliphatic polyisocyanate having an NCO% of 20 or more. According to claim 1 or 2,
Silicone acrylic resin containing a hydroxyl group and non-yellowing polyisocyanate have an equivalent ratio of NCO/OH of 1:1. delete delete delete delete delete According to claim 1,
The heat-dissipating pigment is titanium oxide, zinc oxide, indium oxide, tin oxide, antimony tin oxide, indium tin oxide, molybdenum oxide (MoO3), tantalum oxide (Ta2O5), vanadium pentoxide (V2O5) ), niobium oxide (Nb2O5), boron nitronite (BN), hexagonal boron nitride (h-BN), and aluminum oxide (AL2O3). delete According to claim 1 or 2,
The solvent is toluene, aromatic hydrocarbons such as xylene, normal butyl acetate, ethylene glycol ethyl ether acetate, methyl isobutyl ketone, methyl normal amyl ketone, isopropanol, normal butanol, isobutanol, ethylene glycol monomethyl ether, propylene glycol mono A coating agent for top coating for a parking lot floor, characterized in that at least one selected from the group consisting of methyl ether. delete According to claim 1 or 2,
The additive is a coating agent for a top coat for a parking lot floor, characterized in that it comprises a leveling agent and an antifoaming agent. delete delete A primer undercoating layer formed on the surface of the base layer;
an intermediate layer formed on the surface of the lower coating layer; and
Consisting of a top coat layer formed on the surface of the middle coat layer,
Here, the top coat layer is a silicone acrylic resin containing a hydroxyl group, 20 to 50 parts by weight of non-yellowing polyisocyanate, 9 to 30 parts by weight of potassium titanate, 5 to 15 parts by weight of a heat shielding pigment, 1 to 15 parts by weight of a heat radiation pigment, and 10 parts by weight of a solvent. ~40 parts by weight and 1 to 5 parts by weight of additives. The method of claim 22,
The top coat layer is a coating film for a parking lot floor, characterized in that it has a thickness of 50 ~ 100㎛.