KR20220050506A - Top coat for parking lot floor - Google Patents

Abstract

A surface coating method for a parking lot floor of the present invention includes a system coating method including: a first step of forming an undercoat layer by coating a polyurethane prepolymer in a coating thickness of 40 to 60 μm; a second step of forming a high hardness polyurethane intermediate coat layer having excellent impact resistance and adhesion on the undercoat layer in a coating thickness of 1 to 3 mm at room temperature; and a third step of forming a top coat layer having abrasion resistance, anti-slip functions, excellent heat shielding performance and excellent weather resistance in a coating thickness of 50 to 100 μm by using a silicone acrylic resin composition.

Description

Top coat for parking lot floor

The present invention relates to a coating agent for a parking lot floor and a manufacturing method thereof, and more particularly, to a topcoat coating agent for a parking lot floor and a manufacturing method thereof.

To protect the parking lot floor from vehicles, a urethane floor coating layer is installed. The urethane coating layer consists of an undercoat layer coated with a thin film on the parking lot surface, an intermediate layer of a thick film, and a top coat 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 the shrinkage, expansion, or cracking of the floor, or a thick intermediate layer with high hardness to withstand the upper load. Unlike this, it is responsible for design elements such as gloss and/or color, and is often made of a conventional epoxy or urethane coating film.

However, as the number of parking lot repairs due to damage to the upper floor increases, attempts are being made to protect the upper floor or improve the upper floor to increase the convenience of maintenance of the parking lot floor.

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

Republic of Korea Patent No. 1418863 granted to P&Tech ENG Co., Ltd. discloses a coating layer having a top coat layer using silica sand and MMA-based resin as main raw materials.

However, there is a continuing demand for a new top coat layer with excellent scratch resistance, UV resistance, high gloss, anti-slip properties, and abrasion resistance.

An object to be solved in the present invention is to provide a coating agent for a top coat that can form a parking lot floor having excellent scratch, UV, gloss, and anti-slip properties.

An object to be solved in the present invention is to provide a method for producing a coating agent for top coating that can form a parking lot floor having 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 an excellent topcoat layer with excellent scratch, UV, gloss, and anti-slip properties.

Another object to be solved in the present invention is to provide a method for constructing a parking lot floor having an excellent topcoat layer with excellent scratch, UV, gloss, and anti-slip properties.

In order to solve the above problems, the present invention

It provides a coating agent for a top coat for a parking lot floor, characterized in that it contains 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 in theory, 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 of the coating film, while using an acrylic or methacrylic monomer having an aliphatic group. Adjust the glass transition temperature, increase the adhesion by introducing a methacrylic monomer having a hydroxyl group, and increase the crosslinking density by crosslinking with non-yellowing polyisocyanate to improve drying speed, surface hardness, solvent resistance, etc. to improve weather resistance It becomes possible to give

In the present invention, the silicone acrylic resin containing a hydroxyl group includes 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 excellent in gloss and scratch resistance of the coating film and is used to express high weather resistance, and may be, but not limited to, a silicone-containing monomer, and is one of the compounds represented by the following formula (1) may be more than one species.

(1)

(One)

In the present invention, when the content of the silicone-containing monomer is too low, the weather resistance is poor, and when it is relatively high, the 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 controlling the glass transition temperature and to impart gloss and smoothness, and examples thereof 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 It may be 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 enhance the hardness of the coating film and adhesion to the object to be coated, but is not limited thereto, but 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylic lactate, 4-hydroxybutylmethacrylate or mixtures of two or more thereof can be used. When the methacrylic monomer containing a hydroxyl group is used in excess, there is a problem that the viscosity increases.

In the present invention, the silicone acrylic resin containing the hydroxyl group may have a glass transition temperature of 0° C. or higher, preferably 0-50° C., more preferably, to form a high-quality topcoat 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 a non-yellowing polyisocyanate of the German Bayer company, AH series of domestic Aekyung Chemical. In the practice of the present invention, as the non-yellowing polyisocyanate used as a topical agent, Desmodur N-3300 (NCO=23%) manufactured by Bayer, Germany was used.

In the practice of the present invention, it is preferable to use an equivalent ratio of NCO/OH to 1/1 in consideration of the hydroxyl group of the silicone acrylic resin for the amount of the curing agent used. If the hydroxyl group or the isocyanate group of the silicone acrylic resin does not participate in the cross-linking reaction, it may not form a dense cross-linking, which may result in deterioration of the physical properties of the coating film.

In the present invention, the top coating agent may contain 20-50 parts by weight of silicone acrylic urethane based on 100 parts by weight of the coating agent, preferably 25-45 parts by weight, more preferably 30-40 parts by weight. there is. When the content of the silicone acrylic urethane is small, it is difficult to form a strong top coat, and when the content of the silicone acrylic urethane is high, the content of the solvent or other components is reduced, so it may be difficult to form a coating film having appropriate properties.

In the present invention, the coating agent for the top coat may further include potassium titanate to provide anti-slip and wear resistance. The potassium titanate is a functional material of various sizes and shapes and is expressed as K ₂ O·nTiO ₂ , and the n value of the formula can be expressed as 1, 2, 4, 6, 8. Among them, when n is 2, 4, 6, 8, potassium titanate becomes all crystalline fibers, and shape control is possible by addition of Mg, etc. In particular, potassium hexatitanate has chemical stability, abrasion resistance, thermal stability, impact resistance, 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, the potassium titanate is preferably 9 to 30 parts by weight based on 100 parts by weight of the top coating agent. When the content of potassium titanate is less than 9 parts by weight, the anti-slip and abrasion resistance in the final coating film is deteriorated, and when the content of potassium titanate is more than 30 parts by weight, the dispersibility deteriorates and coating becomes difficult. The potassium titanate preferably has an average particle size of 25 to 75 μm, and the potassium titanate has a plate shape, a rod shape, a needle shape, a whisker shape, and the like, and one or more of them 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 reflects more than 90% of the wavelength of 300 to 2,500 nm, which is the near-infrared wavelength region, and after drying, it creates ceramic bubbles in the coating film to absorb and dissipate thermal energy, thereby blocking the conduction of thermal energy. Ceramic spheres. desirable. The ceramic sphere is manufactured in the form of a nonporous spherical ceramic having a size of 4 to 10 micrometers, and performs a heat reflection function to scatter light so as not to be converted into thermal energy by the ceramic sphere to exhibit heat shielding performance. do.

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

In the present invention, the coating agent for the top coat may further include a metallic inorganic heat dissipation pigment having heat dissipation properties for synergy with the heat blocking pigment. Heat radiation pigments include 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).

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

In the present invention, it is preferable that the heat dissipation pigment is 1 to 15 parts by weight based on 100 parts by weight of the top 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, other physical properties are affected and the heat shielding performance is maintained, but there may be problems in that the adhesion of the coating film is lowered and the cost is increased.

In the present invention, the top coating agent may include a solvent to form a uniform coating composition. The solvent used in the present invention includes 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 iso Alcohols such as butanol and glycol ethers such as ethylene glycol monomethyl ether and propylene glycol monomethyl ether can be used. In consideration of the synthesis temperature, solubility parameter, evaporation rate, etc., it is preferable to use a solvent having a boiling point of 100 to 160 ° 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. When the content of the solvent is small, it is difficult to form a uniform thin film, and when the content of the solvent is large, it is difficult to form a coating film of a predetermined thickness, and a lot of organic solvents are released.

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

The present invention in one aspect,

A method of preparing a silicone acrylic resin containing a hydroxyl group through solution polymerization, and mixing the silicone acrylic resin solution, non-yellowing polyisocyanate, potassium titanate, heat-shielding pigment, heat-dissipating pigment, and additives to prepare a topcoat coating agent to provide.

In the present invention, the silicone acrylic resin including the 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 be performed using a solution polymerization method.

In the practice of the present invention, the silicone acrylic resin including 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, 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, and the number average molecular weight of the resin composition is 16,000 to 20,000 , a glass transition temperature of +30 ℃, a viscosity in the range of 5 to 15 cPs, and is provided as a silicone acrylic resin composition having a solid concentration of 50%.

In the present invention, as the radical polymerization initiator used for the polymerization, benzoyl peroxide, tert-butylperoxybenzoate, tert-butylperoxy-2-ethylhexanoate, terteriamilperoxy-2-ethylhexano ate, azobisisobutyronitrile, and the like. Such radical polymerization initiators may be used alone or in combination of two or more. The amount of the initiator used is 1 to 3 parts by weight, preferably 1 to 2 parts by weight, based on the total weight of the monomer composition. 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, in the method for synthesizing the resin composition, a mixed solution containing the above-listed monomers and an initiator is added and dropped into the solvent solution in the reactor at a uniform rate for 3 to 5 hours, while dripping at a temperature of 80 to 100 ° C. Proceed by polymerization for ~12 hours. As described above, by stably inducing the reaction conditions, a silicone-containing acrylic resin composition having excellent gloss, good smoothness, and good scratch resistance can be obtained.

The present invention in one aspect,

a primer undercoat layer formed on the surface of the base layer;

an intermediate layer formed on the surface of the undercoat layer; and

Consists of a top coat layer formed on the surface of the intermediate layer,

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

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

The present invention in one aspect,

forming a primer undercoat layer to be coated on the parking lot floor;

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

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

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

In the present invention, the polyurethane prepolymer for forming the undercoating layer (primer) may be prepared by a conventional method, 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) prepared by reacting a polyurethane prepolymer with NCO (%) = 7.0 is prepared and used, and the polyurethane prepolymer prepared in this way is usually added An antifoaming agent, a water absorbent, a solvent, etc. are added and mixed and stirred, and then 0.1 wt% of dibutyltin dilaurate (DBTDL) is mixed and used as a reaction catalyst to prepare a primer.

In one embodiment of the present invention, the undercoating layer is 15 parts by weight of toluene, 40 parts of crude MDI (4,4'-Diphenylmethane Diisocyanate), and 0.02 parts by weight of DBTDL (Di- n -butyltindilaurate), which is a reaction catalyst, in a 4-neck flask. After heating and stirring, the temperature was raised to 57±3 ℃, and then 25 parts by weight of PP-400 (Polypropylene Glycol, functional group = 2, molecular weight 400) was added to 25 parts by weight of toluene, and the mixed solution was slowly added for 2 hours. Then, the reaction temperature was raised to 857±3 ℃ over 1 hour, and after reacting at the same temperature for 4 more hours, the reaction was terminated to complete the polyurethane prepolymer (solid content 67%, color (Gardner) 18, NCO (%) = 7.0). ) 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, 35 parts by weight of the extender pigment Talc was mixed and stirred for 30 minutes, then dispersed with an attrition mill so that the particle size was 5 or more in NS (North Standard graduations) units, and then added with a post-additive antifoaming agent BYK-066N (BYK-Chemie) 0.3 After adding 0.5 parts by weight of flow control agent BYK-410 (BYK-Chemie) and 5 parts by weight of a mixed solvent, the mixture was stirred 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 0.1% by weight of DBTDL, which is a reaction catalyst, with respect to 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 a concrete structure. This is because when the thickness of the coating film is less than 40 μm, the adhesion to the concrete structure to be coated is lowered, and the bonding strength with the polyurethane intermediate attached to the upper layer is insufficient, causing a floating phenomenon in the middle. Conversely, when the thickness of the coating film is 60 μm or more This is because the drying time is long and the workability is poor.

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

In the present invention, the intermediate layer is a high hardness polyurethane intermediate coating agent coated on the upper layer of the polyurethane prepolymer, and the hardness is Shore A 90 or more, and it is suitable to be coated with a thickness of 1 to 3 mm. This is because if the hardness is low, it cannot withstand the compressive load of the upper layer. In addition, if the thickness of the polyurethane coating of high hardness is 1 mm or less, it cannot withstand the compressive load applied from the upper part, so structural stability and abrasion resistance are deteriorated. Although the abrasion resistance is good, it is difficult to form a uniform surface, and there are problems in that the abrasion resistance is lowered due to the generation of air bubbles, and the drying time is delayed and the construction cost is high.

The high hardness polyurethane intermediate coating agent is coated using a catalyst and using a trowel or a special rag, cured and dried at room temperature within 24 hours, and then the next step, the top coat, is immediately applied.

In one embodiment of the present invention, the intermediate coating agent is added 35 parts by weight of TDI-80 (Toluene Diisocyanate) and 0.03 parts by weight of Benzoyl Chloride, which is a reaction stabilizer, into a four-neck flask, heated to 27±3 ℃ while heating and stirring, and then here 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 added for 3 hours, then the reaction temperature was raised to 88±3 ° C over 1 hour, and after reacting at the same temperature for 4 hours, the reaction was terminated and the isocyanate prepolymer (solid content 100%) , color (Gardner) 4, NCO (%) = 9.0) was prepared, and the thus-prepared isocyanate prepolymer was used as a curing agent for a high hardness polyurethane intermediate coating agent.

Separately, 30 parts by weight of calcium carbonate, 15 parts by weight of Talc, 8 parts by weight of BaSO ₄ and tris (2,4-dichloropropyl ) After mixing 5 parts by weight of phosphate and 2 parts by weight of antibacterial BIT, stirring for 30 minutes, disperse it with an Attrition Mill so that the particle size becomes 5 or more in NS (North Standard Graduations) unit, and then use a post-addition agent to add antifoaming agent BYK-066N After adding 0.3 parts by weight of (BYK-Chemie) and 0.5 parts by weight of the flow control agent BYK-410 (BYK-Chemie), the mixture was further stirred for 30 minutes to make a polyurethane intermediate coating agent.

When the prepared base material and the NCO/OH equivalent ratio of the curing agent are mixed at 1/1, DBTDL as a catalyst is mixed in 0.1 wt% with respect to the total composition, and a high hardness polyurethane intermediate layer having a Shore A of 90 or more can be formed.

The surface coating agent and surface coating method for a parking lot floor of the present invention comprises: a first step of forming an undercoat layer by coating a polyurethane prepolymer with a film thickness of 40 to 60 μm; a second step of forming a high hardness polyurethane intermediate layer having excellent impact resistance and adhesion thereon with a coating film thickness of 1 to 3 mm at room temperature; The parking lot floor of KS F 4937 using the system coating method of the third step to form a top coat layer with a film thickness of 50 to 100 μm with excellent heat shielding performance and weather resistance while 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 for 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, not to limit the present invention.

Examples 1-3 and Comparative Example 1

After putting 140 g of xylene and 60 g of n-butanol in a four-neck flask equipped with a thermometer, condenser, dropping funnel, and stirrer, the temperature was raised to 90 °C while substituted with nitrogen gas and stirring. After that, a mixed solution of 4 g of azobisisobutyronitrile as the following monomer and initiator was added dropwise at a uniform rate over 3 to 5 hours while maintaining the temperature of the solvent constant. After completion of the dropping, the mixture was further aged for 3 hours, and then 0.5 g of azobisisobutyronitrile was dissolved in 50 g of xylene as a post-addition initiator and dropped over 30 minutes, and the reaction was terminated by removing unreacted monomers while stirring for a further 3 hours. Then, 86.8 g of xylene and 58.7 g of n-butanol were added and diluted to obtain a silicone-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 matter
(%) 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 the physical properties of the coating film

In order to investigate the characteristics of the coating film formed from the composition containing the (silicone) acrylic resin of (Experimental Examples 1 to 3) and Comparative Example 1, as shown in Table 1 below, a non-yellowing poly(silicone) non-yellowing poly A (silicone) acrylic/urethane white paint was prepared using Bayer's Desmodur N-3300, which is an isocyanate, and the NCO/OH equivalent ratio was 1/1.

The coating film performance test specimen was prepared as follows.

First, after cleaning the surface of the concrete, using a polyurethane prepolymer as a primer, spray painting to a dry film thickness (DFT) of 50 μm, drying it naturally, and then coating it with a high hardness polyurethane coating to a film thickness of 3 mm and drying it. After drying naturally for 1 day, the top coat prepared by the above formulation was spray coated with DFT 75 μm, and then naturally dried for 7 days to obtain a test film.

NO. ingredient Example 1 Example 2 Example 3 comparative example characteristic Hado
(thickness 50㎛) Polyurethane
prepolymer 40 40 40 40 synthetic
67% solids, 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 midway
(Thickness 3mm) high hardness polyurethane
(Subject/hardener) 63 63 63 63 Synthetic product (hardener)
NCO/OH=1/1 chain extender 10 10 10 10 US UOP company UNILINK 4200 (N,N'-Dialkylamino-diphenylmethane) color pigment 3 3 3 3 Chrome oxide green GX from Bayer Chemicals, Germany body 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 normal course
(thickness 75㎛) (Silicone) Acrylic/
Urethane (substance/hardener) Experimental Example 1
35 Experimental Example 2 35 Experimental Example 3 35 Comparative Example 1 35 Synthetic product (subject)
NCO/OH=1/1 solvent 28 23 18 40 MIXTURE additive 3 3 3 3 Antifoaming 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 - USA 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. For the wheel load resistance performance test, the thickness reduction depth was measured by evaluating 80,000 times at a vertical load of 300 kg and running speed of 5 km/h according to the test method for surface finishing materials for parking lot floors of KS F 4937.

2. Slip resistance test

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

3. Heat shielding is to prevent outside air from flowing into the roof of the model house (250mm X 250mm X 150mm), which is made of a Styrofoam material with the specimen painted on the steel plate (300mm X 300mm X 0.5mm) open. keep it sealed. Infrared lamp (Osram, E27 screw base, 250W) was irradiated to the upper 30cm height of the test piece for 30 minutes, and the temperature of the interior surface of the roof and the room by time was measured with a digital temperature sensor (OMEGA, Model HH21). The relative thermal insulation performance is measured as a temperature difference. At this time, these thermal insulation performance measuring devices are installed in a closed place.

4. Measurement of solar radiation reflectance is according to the method of measuring solar radiation reflectance of KSM 5987 thermal barrier coating, and the specimens coated on a glass substrate with a width and length of 20 cm X 30 cm and a thickness of 3.0 mm are measured using a UV Visible spectro photometer (spectrometer, Jasco). Solar radiation reflectance was measured using V-670, wavelength 250 ~ 2500nm).

5. Accelerated weathering test

The accelerated weather resistance test was conducted using a sunshine weather-Ometer (Atlas Electric Devices Co., Ci65A type) according to the accelerated weather resistance test method for paints of KS M 5000-3231 to measure the gloss preservation value and color difference for each time period of 1,000, 2,000, and 3,000. evaluated.

(1) Measurement of gloss retention value

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

(2) Color difference measurement

The color difference is the expression of the difference between two colors from a visual concept to a numerical concept. That is, the geometric distance of two colors in color space coordinates is expressed numerically. It was measured using a diffuse reflectance measuring device, Spectro Color Meter (Nippon Denshoku Kogyo Co., SZ-∑80 type), and the color difference was calculated by the following equation.

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

From here, L = Brightness index of Hunter color indicator

a , b = Chromaticness coefficient of 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 thermal insulation roof interior surface temperature
(℃) before investigation 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 investigation 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 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 compositions of Comparative Examples were used rather than when the compositions of Examples 1 to 3 of the present invention were used, the wheel load resistance performance and slip resistance were poor, and Example 3 with a high potassium hexatitanate content This gave the best results.

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

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

Those of ordinary skill in the art 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 content. Therefore, the technical scope of the present invention should be defined by the claims, not limited to the content described in the detailed description of the specification.

Claims (23)

A coating agent for a top coat for a parking lot, characterized in that it contains a silicone acrylic resin containing a hydroxyl group and non-yellowing polyisocyanate. According to claim 1,
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 characterized in that it consists 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. A coating agent for the top coat of the parking lot floor. 4. The method of claim 3,
The silicone-containing monomer is a coating agent for a topcoat for a parking lot, characterized in that at least one selected from the following formula (1).

(One) 4. The method of 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- Ethylhexyl methacrylate, octyl methacrylate, glycidyl methacrylate, lauryl methacrylate, isobornyl methacrylate, characterized in that at least one selected from the group consisting of a top coating for a parking lot floor. 4. The method of claim 3,
The methacrylic monomer having a hydroxyl group is a coating agent for a topcoat for a parking lot floor, characterized in that at least one selected from 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, and 4-hydroxybutyl methacrylate . 3. The method of claim 1 or 2,
The silicone acrylic resin containing the hydroxyl group has a glass transition temperature of 0 to 50 ℃, a coating agent for a top coat for a parking lot floor. 3. The method of claim 1 or 2,
The non-yellowing polyisocyanate is an aliphatic polyisocyanate having an NCO% of 20 or more. 3. The method of claim 1 or 2,
A silicone acrylic resin containing a hydroxyl group and non-yellowing polyisocyanate have an NCO/OH equivalent ratio of 1:1. 3. The method of claim 1 or 2,
The silicone acrylic resin containing a hydroxyl group and non-yellowing polyisocyanate are included in an amount of 20-50 parts by weight from 100 parts by weight of the topcoating agent. 3. The method of claim 1 or 2,
The top coating agent for a top coating for a parking lot floor, characterized in that it comprises potassium titanate. 12. The method of claim 11,
The potassium titanate is a topcoat coating agent for a parking lot floor, characterized in that 9 to 30 parts by weight in 100 parts by weight of the topcoat coating agent. 3. The method of claim 1 or 2,
The top coating agent for a parking lot floor top coating, characterized in that it comprises a heat-shielding pigment. 14. The method of claim 13,
The heat-shielding pigment is a coating agent for a parking lot floor, characterized in that 5 to 15 parts by weight from 100 parts by weight of the top coating agent. 14. The method of claim 1 or 13,
The top coating agent is titanium oxide, zinc oxide, indium oxide, tin oxide, antimony tin oxide (Antimony Tin Oxide), indium 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), aluminum oxide (AL2O3) Parking lot characterized in that it further comprises a heat dissipation pigment selected from the group consisting of Coatings for top coats for floors. 16. The method of claim 15,
The heat dissipation pigment is a coating agent for a parking lot floor, characterized in that 1 to 15 parts by weight in 100 parts by weight of the top coating agent. 3. The method of claim 1 or 2,
The top coating agent includes aromatic hydrocarbons such as toluene and xylene, normal butyl acetate, ethylene glycol ethyl ether acetate, methyl isobutyl ketone, methyl normal amyl ketone, isopropanol, normal butanol, isobutanol, ethylene glycol monomethyl ether, and propylene. A coating agent for a top coat for a parking lot floor, characterized in that it contains one or more solvents selected from glycol monomethyl ether. 18. The method of claim 17,
The solvent is a topcoat for a parking lot floor, characterized in that 10 to 40 parts by weight in 100 parts by weight of the topcoating coating agent. 3. The method of claim 1 or 2,
The top coating agent for a top coating for a parking lot floor, characterized in that it comprises an additive including a leveling agent and an antifoaming agent. 3. The method of claim 1 or 2,
The top coating agent for a parking lot floor, characterized in that it comprises a silicone acrylic resin containing a hydroxyl group, non-yellowing polyisocyanate, potassium titanate, a heat-shielding pigment, a heat-dissipating pigment, a solvent and an additive. 21. The method of claim 20,
100 parts by weight of the topcoating agent is a silicone acrylic resin containing a hydroxyl group and 20-50 parts by weight of non-yellowing polyisocyanate, 9-30 parts by weight of potassium titanate, 5-15 parts by weight of a heat-shielding pigment, 1-15 parts by weight of a heat dissipation pigment, 10 parts by weight of a solvent A coating agent for a top coat for a parking lot, characterized in that it consists of 40 parts by weight and 1 to 5 parts by weight of additives. a primer undercoat layer formed on the surface of the base layer;
an intermediate layer formed on the surface of the undercoat layer; and
Consists of a top coat layer formed on the surface of the intermediate layer,
The top coat layer is a coating film for a parking lot floor, characterized in that it comprises a silicone acrylic urethane resin. 23. The method of claim 22,
The top coat layer has a thickness of 50 to 100㎛, a coating film for a parking lot floor, characterized in that it comprises potassium titanate, a heat-shielding pigment, and a heat-dissipating pigment.