KR102462720B1 - Polyurea composition for multi-functional layer and method for forming a water-proof structure - Google Patents

Abstract

A disclosed multi-functional polyurea composition includes a basic material part and a curing agent part. The basic material part includes isocyanate prepolymer and a flame retardant. The curing agent part includes polyetheramine, crosslinking agent, pigment, ceramic hollow pigment, aerogel, zeolite, white charcoal, flame retardant and UV stabilizer. The isocyanate prepolymer reacts 10 to 20 wt% of 2,2'-MDI, 10 to 20 wt% of 2,4'-MDI, 20 to 30 wt% of 4,4'-MDI, and 30 to 60 wt% of polypropylene glycol, and has 14 to 16% of NCO%. The content of the functional powder component including the ceramic hollow pigment, the aerogel, the zeolite, and the white charcoal is 3 to 5 wt% based on the total weight of the curing agent part. The multi-functional polyurea composition can form a waterproof coating having multi-functional properties such as heat insulation performance, heat insulation performance, and antibacterial performance.

Description

Multifunctional polyurea composition and waterproof structure construction method using same

The present invention relates to waterproof structure construction, and more particularly, to a multifunctional polyurea composition and a waterproof structure construction method using the same.

Inside and outside of buildings, for example, underground parking lots, swimming pools, waste treatment plants, water purification plants, water storage tanks, septic tanks, roof waterproofing, steel structures, steel pipes, factory floors, gas stations, roofs of sports facilities, etc., floors, underground parking lots, window frames, etc. In order to prevent moisture from penetrating into the interior, waterproof construction is carried out by applying a waterproofing material to the surface.

Depending on the construction site and waterproofing material, various construction methods such as polyurethane coating waterproofing, epoxy coating waterproofing, polyurea coating waterproofing, sheet waterproofing, composite sheet waterproofing, asphalt sheet waterproofing, mortar waterproofing, metal waterproofing, and sealing waterproofing are being implemented. In recent years, a lot of polyurea coating waterproofing materials are being implemented as a spraying method.

Asphalt sheet waterproofing, which has been widely practiced in the past, is elastic as time goes by due to temperature changes in the environmental climate and UV rays, in particular, the low temperature in winter and high temperature in summer, temperature changes due to direct exposure to sunlight and the influence of UV rays. Physical properties such as cracks and fractures may cause water leakage due to physical actions such as cracks and fractures due to deterioration of physical properties and fatigue.

Polyurethane waterproofing material has excellent elongation, but low tensile strength, tearing strength, and hardness. . On the other hand, polyurea is superior to polyurethane and epoxy in terms of elongation, tensile strength, tear strength, abrasion resistance, temperature dependence, adhesion, impact resistance, hardness, crack resistance, crack followability, chemical resistance, etc. It can compensate for the disadvantages of polyurethane, and accordingly, it has been widely favored as a waterproofing material in recent years. The construction method of such a polyurea waterproofing film is a substrate treatment method, a moisture-curing one-component primer undercoating method, a middle coating method of a polyurethane one-component or two-component base adjustment material, a spraying method of a polyurea coating film waterproofing material, non-yellowing urethane A top coat coating method and the like are known.

One object of the present invention is a multifunctional poly that can form a waterproof coating film having not only basic physical properties necessary for a waterproofing function, but also multifunctionality (flame retardant performance, flame retardant performance, thermal insulation performance, heat shielding performance, antibacterial performance, far-infrared radiation, etc.) To provide a urea composition.

Another object of the present invention is to provide a waterproof construction method using the multifunctional polyurea composition.

However, the problems to be solved by the present invention are not limited to the above-mentioned problems, and may be variously expanded without departing from the spirit and scope of the present invention.

A multifunctional polyurea composition according to exemplary embodiments of the present invention for achieving the above-described object of the present invention includes a main part and a curing agent part. The main part includes an isocyanate prepolymer and a flame retardant. The curing agent part includes polyetheramine, crosslinking agent, pigment, ceramic hollow pigment, airgel, zeolite, white charcoal, flame retardant and UV stabilizer. The isocyanate prepolymer is 2,2`-MDI 10 to 20% by weight, 2,4`-MDI 10 to 20% by weight, and 4,4`-MDI 20 to 30% by weight and polypropylene glycol 30 to 60% by weight are reacted and has an NCO% of 14 to 16%. The content of the functional powder component including the ceramic hollow pigment, the airgel, the zeolite and the white charcoal is 3 to 5% by weight based on the total weight of the curing agent part.

According to an embodiment, the content of the flame retardant in the main part and the curing agent part is 5 wt% to 10 wt%, respectively, and the flame retardant is tris (2-chloroethyl) phosphate (Tris (2-chloroethyl) phosphate ) is included.

According to an embodiment, the crosslinking agent includes an aromatic amine compound, and the curing agent part includes 55 wt% to 75 wt% of the polyether amine and 20 wt% to 25 wt% of the crosslinking agent.

According to an embodiment, the crosslinking agent includes diethyltoluenediamine.

According to one embodiment, the pigment is from the group consisting of carbon black, titanium dioxide (TiO2), iron oxide yellow and iron oxide red and phthalocyanine green. at least one selected.

According to an embodiment, the curing agent part includes 1 wt% to 5 wt% of the pigment.

The waterproof structure construction method according to an embodiment of the present invention comprises the steps of directly coating a polyurea composition for undercoating on a concrete base to form an undercoat layer, coating a functional polyurea composition on the undercoating film to form an intermediate layer and coating a urethane composition on the intermediate layer to form a top coat layer.

As described above, according to exemplary embodiments of the present invention, it is possible to form a waterproof coating film having multi-functionality such as thermal insulation performance, heat shielding performance, and antibacterial performance.

In addition, according to the waterproof structure construction method of the present invention, the pinhole cover performance of the undercoat itself is excellent, so that the urethane base adjustment process is omitted and the curing time is fast, so that the construction time can be shortened.

1 to 3 are cross-sectional views illustrating a waterproof structure construction method according to an embodiment of the present invention.
4 is a thermal conductivity test report of Example 11.
5 is a thermal emissivity test report of Example 11.
6a, 6b, 6c and 6d are the antibacterial activity, mold resistance, flame retardancy and fire resistance test results of Example 11.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as "comprise" or "have" are intended to designate that a feature, number, step, operation, element, or a combination thereof described in the specification exists, but one or more other features or numbers , it should be understood that it does not preclude the possibility of the presence or addition of steps, operations, components, or combinations thereof.

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

Multifunctional Polyurea Composition

subject part

The polyurea composition according to an embodiment of the present invention may be a two-component composition including a main part and a curing agent part.

The main part may include an isocyanate prepolymer and a flame retardant. The isocyanate prepolymer has an isocyanate group (-OCN) at the terminal, and may be obtained by reaction of a polyol with an isocyanate.

The isocyanate may include aromatic isocyanate or aliphatic isocyanate. For example, the isocyanate may include methylene diphenyl diisocyanate (MDI), toluene diisocyanate (TDI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), and the like.

According to one embodiment, the isocyanate may include MDI. The MDI may include Polymeric MDI, Monomeric MDI, Modified MDI, Specal MDI, and the like. MDI monomer consists of three isomers: 2,2'-MDI, 2,4'-MDI, and 4,4'-MDI. Among them, 4,4′-MDI is called pure MDI or monomeric MDI, and polymeric MDI may be a mixture of monomeric MDI and higher molecular weight polynuclear methylene diphenyl diisocyanate.

In the present invention, the MDI forming the isocyanate prepolymer may be selected in consideration of various physical properties such as reactivity, mechanical properties, chemical properties, heat resistance, cold resistance, temperature dependence, stability, storability, etc. and the use environment.

The polyol has at least two or more hydroxyl groups. The polyol may include polyether polyol, polyester polyol, and the like. According to one embodiment, the polyol may be a polyether polyol. For example, the polyether polyol may include polyethylene glycol, polypropylene glycol, polytetramethylene ether glycol (PTMG), polycaprolactonediol, and the like. In addition, the polyether polyol may include a urea-modified polyol, a urethane-modified polyol, an amine-modified polyol, and the like.

According to one embodiment, the isocyanate prepolymer is a mixture of 2,2′-MDI, 2,4′-MDI and 4,4′-MDI (MDI isomer mixture) 30 to 70% by weight based on the total weight of the reactant, and It can be obtained by reacting 30 to 70% by weight of polypropylene glycol.

Specifically, the isocyanate prepolymer, 2,2'-MDI 10 to 20% by weight, 2,4'-MDI 10 to 20% by weight, and 4,4'-MDI 20 to 30% by weight based on the total weight of the reactant, and It can be obtained by reacting 30 to 60% by weight of polypropylene glycol. More preferably, the isocyanate prepolymer, 2,2'-MDI 15 to 20% by weight, 2,4'-MDI 15 to 20% by weight, and 4,4'-MDI 23 to 27% by weight based on the total weight of the reactant And it can be obtained by reacting 35 to 50% by weight of polypropylene glycol. In addition, the NCO% content of the main part (isocyanate prepolymer) may be 12 to 20%, preferably 14 to 16%.

When the content of the polypropylene glycol is excessive, hardness, tensile strength and tear strength may be reduced. In addition, when the content of the polypropylene glycol is too small, the elongation may be excessively reduced. If the content of 4,4'-MDI is excessive, initial curing may be poor and mechanical properties may be reduced, and if the content of 4,4'-MDI is too small, chemical resistance may be reduced.

According to one embodiment, the flame retardant may include tris (2-chloroethyl) phosphate (Tris (2-chloroethyl) phosphate).

According to an embodiment, the main part may include 85 to 99% by weight of the isocyanate prepolymer and 1 to 15% by weight of the flame retardant. Preferably, the main part may include 88 to 95% by weight of the isocyanate prepolymer and 5 to 12% by weight of the flame retardant. More preferably, the main part may include 90 to 95 wt% of the isocyanate prepolymer and 5 to 10 wt% of the flame retardant.

hardener part

The curing agent part according to an embodiment of the present invention, polyether amine, crosslinking agent (chain extender), pigment (Pigment), ceramic hollow pigment, airgel (aerogel), zeolite (Zeolite), white charcoal, flame retardant and UV stabilizer may include.

The polyether amine may be an aliphatic amine, for example, may have a number average molecular weight of 1,000 to 3,000. The crosslinking agent may be an aromatic amine. For example, the crosslinking agent may include diethyltoluenediamine (DETDA) or the like.

The polyether amine and the crosslinking agent may react with the isocyanate prepolymer of the main part. The content of the amine compound including the polyether amine and the crosslinking agent may be determined according to the NCO% content of the main part. For example, when the crosslinking equivalent ratio of the main part and the curing agent part is out of the range of 1.05 to 1.10, there may be problems such as non-curing, poor curing, swelling, etc. Therefore, it is preferable that the crosslinking equivalent ratio of the main part and the curing agent part is 1.05 to 1.10.

For example, the content of the polyether amine may be 50 to 85% by weight, and the content of the crosslinking agent may be 10 to 30% by weight based on the total amount of the curing agent part. Preferably, the content of the polyether amine may be 55 to 75% by weight, and the content of the crosslinking agent may be 20 to 25% by weight.

For example, the isocyanate prepolymer (OCN-R-OCN) of the main part and the amine compound of the curing agent part may react with each other according to Chemical Formula 1 below to form polyurea.

<Formula 1>

Polyurea waterproof coating film may have different reaction rates and physical properties depending on the structure of the aromatic compound and the structure of the aliphatic compound, and depending on the reaction design and chemical structure, the reactivity may be divided into a super-velocity type and a slow-dry type. For example, as the NCO% content increases, physical properties such as hardness, tensile strength, and tear strength increase and the elongation rate may decrease. This can be reduced.

The pigment is for hiding and imparting color to the coating film, for example, carbon black, titanium dioxide (TiO2), iron oxide yellow, iron oxide red, phthalocyanine. Green (Phthalocyanine green) and the like may be included.

The content of the pigment may be 1 to 5 wt% of the total weight of the curing agent part. When the content of the pigment is out of the above range, it may be difficult to provide a desired color or hide a coating film and color expression.

The ceramic hollow pigment may impart thermal insulation performance and heat shielding performance to the coating film. Accordingly, it is possible to prevent dew condensation, and it is possible to increase the heating efficiency. In addition, ceramics are more effective in forming a heat insulating layer and a thermal barrier because they have a property of reflecting heat as well as transferring heat less.

For example, the particle diameter of the ceramic hollow pigment may be about 5 to 10 μm, and the content may be 0.1 to 5 wt% of the total weight of the polyurea resin composition. If the particle diameter of the ceramic hollow pigment is too small, heat insulation/heat shielding performance may be deteriorated, and if too large, smoothness of the waterproof coating film may be deteriorated. In addition, when the content of the ceramic hollow pigment is excessive, the viscosity of the curing agent part may excessively increase or precipitates may occur.

The airgel (aerogel) is strong against heat, electricity, sound, impact, and the like, and the weight is about three times greater than that of air of the same volume, so that insulation performance, impact resistance, sound insulation performance, etc. can be improved. For example, the main component of the airgel may be silicon oxide (SiO2), and may have a form in which fibers (one ten thousandth the thickness of hair) are loosely entangled. Air molecules may be included between the fibers, and for example, air may occupy 98% of the total volume.

The airgel, like the ceramic hollow pigment, can improve the insulating performance and heat shielding performance of the coating film, and can also improve the flame retardancy of the coating film.

For example, the content of the airgel may be 0.1 to 1% by weight of the total weight of the polyurea resin composition. When the content of the airgel is excessive, the viscosity of the curing agent part may be excessively increased.

The zeolite is an aluminosilicate mainly composed of silicon, aluminum, and oxygen, and also contains a small amount of a metal such as titanium, tin, zinc, etc., and is a microporous solid that can be used as a molecular sieve. Zeolite has excellent antibacterial and antifungal resistance and improves the durability of the waterproof coating film by improving the heat resistance of the coating film.

For example, the content of the zeolite may be 0.1 to 5% by weight of the total weight of the polyurea resin composition, and the particle size may be 2 to 5㎛. When the content of the zeolite is excessive, precipitation may occur in the curing agent part and the viscosity may excessively increase.

For example, the white coal may be charcoal white coal. The white charcoal adsorbs harmful gases, and the micropores of the charcoal rapidly adsorb moisture and diverge when dry to provide a humidity control function. In addition, white charcoal can provide comfort in a space where a waterproof coating film is installed by emitting far-infrared rays.

Far infrared (FIR) refers to electromagnetic waves that are farthest from visible light, that is, the longest wavelength and lowest frequency range, when infrared rays are divided by wavelength (length of electromagnetic wave vibration), and the wavelength is 15 μm. Between 1 mm in frequency (20 THz ~ 300 Ghz in frequency) is usually classified as far-infrared rays. Far-infrared rays have a longer wavelength than visible light and are invisible to the naked eye. In addition, because the wavelength is similar to the vibrational motion (Scissoring, Twisting, Rocking, Wagging) inside the molecule, the resonance and resonance action on the molecule is strong, so the thermal action is high. There are also studies that show that it is highly effective.

In addition, the white charcoal has excellent deodorization and antibacterial functions, so that it is possible to increase the usability of the waterproof coating film indoors.

For example, the content of the white charcoal may be 0.1 to 1% by weight of the total weight of the polyurea resin composition, and the particle size may be 2 to 5㎛. When the content of the white coal is out of the above range, precipitation may occur in the curing agent part and the viscosity may increase excessively, and the color (black) may be visually recognized.

In the curing agent part, the content of the functional powder component including the ceramic hollow pigment, the airgel, the zeolite and the white charcoal may be about 1 to 10% by weight, preferably 3 to 5% by weight. When the content of the functional powder component is excessive, mechanical properties of the coating film may be deteriorated.

For example, the flame retardant may include tris(2-chloroethyl)phosphate, and the content may be 1 to 15% by weight of the total weight of the polyurea resin composition, preferably 5 to 10% by weight. Tris (2-chloroethyl) phosphate (Tris (2-chloroethyl) phosphate) acts as a viscosity modifier (viscosity reduction) at the same time as a flame retardant, thereby preventing excessive increase in the viscosity of the curing agent containing a significant amount of powder. have. When the content of the flame retardant is excessive, the physical properties of the waterproof coating film may be reduced or uncured components may increase.

The UV stabilizer may prevent components of the polyurea composition from being decomposed or altered by UV rays. For example, the ultraviolet stabilizer may be an amine-based light stabilizer (HALS). The amine-based light stabilizer protects the polymer from UV rays and acts as a primary antioxidant to prevent/reduce discoloration of the coating film.

For example, the content of the UV stabilizer may be 0.1 to 2% by weight of the total weight of the polyurea resin composition. When the content of the UV stabilizer is out of the above range, the physical properties of the waterproof coating film may be reduced or uncured components may increase.

How to construct a waterproof structure

1 to 3 are cross-sectional views illustrating a waterproof structure construction method according to an embodiment of the present invention.

Referring to FIG. 1 , an undercoating layer 23 is formed on the base surface of the substrate 10 . The base 10 may be concrete or the like. Before forming the undercoating layer 23, foreign substances and latency present on the base 10 may be removed by a grinding process or may be cleaned by high-pressure water jet (water jet) of 200 bar or more. The concrete substrate may have micropores (PH, pinholes) resulting from material properties.

The undercoating layer 23 may be formed of a polyurea composition.

According to an embodiment, as the polyurea composition, the polyurea composition for undercoating a waterproofing film described in the applicant's application (Application No. 10-2021-0137677) may be used.

Specifically, the polyurea composition for undercoating may be a two-component composition including a main part and a curing agent part.

The curing agent part includes at least an amine compound (polyamine) and a polyol. According to an embodiment, the curing agent part may further include a desiccant and a diluent.

According to an embodiment, the amine compound may include a non-yellowing (or low-yellowing) polyamine having no aromatic ring structure. For example, the amine compound is 4-4-methylenebis(2-dichloroaniline), tetrakis(2-hydroxypropyl)ethylenediamine, 4,4-methylenebis[N-methylpropyl]cyclohexanamine, tetra ethyl N,N'-(methylenedi-4,1-cyclohexanediyl)bis(aspartate) or a combination thereof. These amine compounds can prevent or reduce yellowing, and have high compatibility with intermediate polyurea to increase interlayer bonding strength. Preferably, the amine compound may include tetrakis (2-hydroxypropyl) ethylenediamine.

The polyol may include an oil-modified polyol, a polyethylene/polypropylene glycol copolymer polyol, or a combination thereof. The oil-modified polyol is obtained by reacting natural oils obtained from flowers or seeds, such as castor oil and sunflower oil, with an alcohol compound, or by denaturing (epoxylation, ring-opening reaction, transesterification reaction, ethoxylation, propoxylation, etc.) Since it is a vegetable-derived component, it can have excellent eco-friendliness.

The polyurea composition according to an embodiment of the present invention may further include a diluent to adjust the curing rate and improve pinhole cover performance (increase smoothness). According to an embodiment, the diluent may include propylene carbonate, 2,2,4-trimethyl-1,3-pentanediol diisobutyrate, or a combination thereof. In one embodiment, the diluent may be propylene carbonate.

In addition, in order to prevent side effects (transition of surface suspended matter) caused by the addition of the diluent, a desiccant may be further included. According to an embodiment, the desiccant may include calcium oxide, zeolite, magnesium oxide, or a combination thereof.

The curing agent part may further include additives such as a dispersant, a thickener, and the like, if necessary.

In addition, the curing agent part may further include a black colorant. The polyurea composition according to an embodiment may be sprayed using painting equipment. For example, the painting equipment includes a storage unit for mixing and storing the curing agent part and the curing agent part, respectively. The curing agent part and the curing agent part may be mixed and sprayed in a volume ratio of about 1:1 from a spray gun. In the polyurea composition of the present invention, when curing is completed, the coating film is whitened. Therefore, the cured coating film may appear uniformly gray by mixing the curing agent part and the curing agent part normally. However, when the proper discharge ratio is not maintained due to an abnormality in the coating equipment, the portion where the whitening phenomenon does not proceed appears black. Therefore, after curing the coating film, the operator can quickly check whether the coating film is defective only by the surface color of the coating film, so that immediate repair is possible. For example, the black colorant may include carbon black, iron oxide, or the like.

For example, the curing agent part may include 20 wt% to 50 wt% of the amine compound and 5 wt% to 30 wt% of the polyol. According to an embodiment, the curing agent part may further include 30% to 50% by weight of the diluent and 1% to 10% by weight of the desiccant. In addition, the curing agent part may further include 1 wt% to 10 wt% of the black colorant. When the content of the diluent is too small, pinhole cover performance may be deteriorated, and when the content of the diluent is excessive, the curing rate may decrease and the bonding strength with the intermediate layer may be reduced.

According to an embodiment, the curing agent part is 30% to 40% by weight of the amine compound, 10% to 20% by weight of the polyol, 35% to 45% by weight of the diluent, 3% to 7% by weight of the desiccant and It may include 3 wt% to 7 wt% of the black colorant.

According to an embodiment, the curing agent part is 20% to 50% by weight of the amine compound, 5% to 30% by weight of the polyol, 30% to 50% by weight of the diluent, 1% to 10% by weight of the absorbent, 1 wt% to 10 wt% of the black colorant and 1 wt% to 5 wt% of the ceramic hollow pigment may be further included.

The ceramic hollow pigment may increase the thermal insulation performance (thermal insulation performance) of the waterproofing membrane. Accordingly, it is possible to reduce heating and cooling charges for houses and the like.

When the content of the ceramic hollow pigment is too small, it is difficult to improve the thermal insulation performance, and when it is excessive, the pinhole covering performance of the composition may be deteriorated. Therefore, the content of the ceramic hollow pigment is preferably 1 wt% to 5 wt%, preferably 3 wt% to 5 wt%.

According to an embodiment, the curing agent part may further include 1 wt% to 5 wt% of a phosphorus-based flame retardant. The flame retardant may impart flame retardancy to the coating film. For example, the phosphorus-based flame retardant may include TCPP (trichloropropylphosphate).

The main part may include a urethane prepolymer and an isocyanate compound, and may further include a desiccant and a diluent. In addition, the main part may further include additives such as a dispersant, a thickener, and the like, if necessary.

The urethane prepolymer may be obtained by reacting an aromatic diisocyanate and a polyol. For example, the aromatic diisocyanate may include toluene diisocyanate (TDI), methylene diphenyl diisocyanate (MDI), or a combination thereof. For example, the polyol may include a polyether polyol, a polyester polyol, a polycarbonate polyol, a polycaprolactone polyol, a polybutadiene polyol, an alkyd polyol, or a combination thereof.

According to one embodiment, the urethane prepolymer may be obtained by reacting methylenediphenyl isocyanate, polyoxyalkylene glycol, and 1,3-butylene glycol, and may have an isocyanate group at the terminal. For example, the urethane prepolymer may be obtained by reacting 15 to 30 parts by weight of methylenediphenyl diisocyanate, 5 to 10 parts by weight of polyoxyalkylene glycol, and 0.1 to 5 parts by weight of 1,3-butylene glycol, The reaction may proceed at about 50°C. The residual isocyanate content of the urethane prepolymer may be 15% to 30%, and the weight average molecular weight may be about 2,000 to about 4,000.

According to an embodiment, the isocyanate compound is an aliphatic isocyanate such as 1,6-hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), or the like, or toluene diisocyanate, methylene diphenyl diisocyanate, polymethylene polyphenyl iso aromatic isocyanates such as cinate and the like.

The same as those used in the curing agent part may be used as the desiccant and diluent. According to one embodiment, it may be preferable that a desiccant and a diluent are added to each of the curing agent part and the main part of the polyurea composition. When the diluent is added only to either one of the curing agent part or the main part, an imbalance in the discharge ratio may occur due to a difference in viscosity. In addition, when the desiccant is added only to either the curing agent part or the main part, the moisture absorbent content is excessively increased, and powder precipitation may appear.

According to an embodiment, the main part may further include a moisture blocking agent (a sunscreen agent) to improve storage stability. When the main part further includes a desiccant, the isocyanate group may react with moisture in the air to form a gel as it is exposed to the atmosphere during the stirring process. According to the present invention, storage stability can be improved by adding a moisture barrier agent that reacts with moisture before the isocyanate component of the main part. For example, the moisture barrier may include 4-methylbenzenesulfonyl isocyanate, oxazolidine, or a combination thereof.

For example, the main part may include 10 wt% to 40 wt% of the urethane prepolymer and 10 wt% to 40 wt% of the isocyanate compound. According to an embodiment, the main part may further include 30% to 50% by weight of the diluent, 1% to 10% by weight of the desiccant, and 0.1% to 3% by weight of the moisture barrier agent.

According to one embodiment, the main part is 10% to 30% by weight of the urethane prepolymer, 20% to 40% by weight of the isocyanate compound, 40% to 50% by weight of the diluent, 1% to 10% by weight of the desiccant and 0.5 wt% to 2 wt% of the moisture barrier agent may be included.

According to an embodiment, the polyurea composition for undercoating may be sprayed onto the base material 10 by a polyurea-only coating device.

For example, the polyurea composition for undercoating may be sprayed under low-temperature, low-pressure conditions or high-temperature and high-pressure conditions. For example, the low-temperature and low-pressure conditions may be from about 30° C. to about 50° C., the discharge pressure may be from about 100 psi to about 500 psi, and the high-temperature and high pressure conditions may be from about 60° C. to about 70° C., and the discharge pressure is about 1,500 psi to about 2,000 psi.

For example, the polyurea composition for undercoating may be sprayed under low temperature and low pressure conditions in order to control the curing rate or to minimize scattered dust. In addition, it is possible to suppress fine floating particles that may occur during painting (to minimize the impact on operator safety and surrounding structures), and to form a flat top surface with high airtightness with the substrate and to finish the polyurea intermediate layer to be subsequently painted. You can keep the surface beautiful. However, embodiments of the present invention are not limited thereto, and the polyurea composition for undercoating may form an excellent undercoating film even under high temperature and high pressure conditions.

According to an embodiment, the curing agent part and the main part of the polyurea composition for undercoating may be sprayed after collision mixing at high temperature and high pressure in the spray gun 30 . However, the present invention is not limited thereto, and the curing agent part and the main part of the polyurea composition for undercoating may be screw-mixed by a static mixer in a low temperature and low pressure state.

For example, the mixing ratio of the main part and the curing agent part may be about 1:1 by volume, and the molar ratio of the reactive groups (amine groups and hydroxyl groups) of the main part and the isocyanate groups of the curing agent part is about 1.0:1.1 to about 1.0:1.2 can be

The polyurea composition for undercoating can sufficiently fill the micropores (PH) of the base material 10 by having a low curing rate and high fluidity. Therefore, it is possible to form the undercoat layer without the conventional polyurethane base adjustment layer.

The cured undercoating layer 23 may exhibit a gray color due to a whitening phenomenon and a black colorant included in the curing agent part. When the discharge ratio of the mixture of the curing agent part and the main part is different, a black part or a white part may appear. Accordingly, as the operator quickly recognizes whether the undercoat layer 23 is defective, immediate repair is possible.

Referring to FIG. 2 , an intermediate layer 24 is formed on the undercoat layer 23 .

The polyurea composition for forming the intermediate layer 24 may be the aforementioned multifunctional polyurea composition.

The intermediate layer 24 may be formed by a polyurea-only coating device, and may be formed under high temperature and high pressure conditions. For example, the high temperature and high pressure conditions are about 65° C. to about 75° C. (hose heating temperature), the spray chamber is about 0.42 inches to about 0.60 inches, and the discharge pressure (spray spray pressure) is about 2,000 psi to about It can be 3,000 psi. In addition, the thickness of the coating film may be about 1,000 μm to about 2,000 μm.

Referring to FIG. 3 , a top coat layer 26 is formed on the intermediate layer 24 . For example, the top coat layer 26 may be formed using a urethane resin, an acrylic resin, a urethane acrylic resin, an epoxy resin, or a combination thereof. It can be formed by coating.

Hereinafter, the mechanical performance and functionality of the polyurea composition according to the present invention and a coating film formed using the same will be described in detail through specific examples and experiments.

Example

According to Table 1 below, the polyurea compositions of Examples 1 to 6 were prepared. (content: wt%)

Specifically, for manufacturing the main part, Kumho Mitsui's Cosmonate PI (2,4'-MDI: 2,2'-MDI = 50%: 50%), Cosmonate LL (4,4'-MDI) were placed in a 10L glass reactor. ) and Kumho Petrochemical's PPG-2000 were weighed using an electronic scale and then added. Next, the reaction temperature was set to 80 to 90° C., and while the temperature was raised and maintained, the reaction was maintained by mixing at 40 rpm for 3 hours using a stirrer to prepare an isocyanate prepolymer.

For the preparation of the curing agent, D-2000 and T-5000 (above Huntsman Corporation) as polyamines and DETDA (Albermal Inc.) as a crosslinking agent were weighed and put in a 10L container with an electronic balance. TiO2 pigment and carbon black pigment were weighed with an electronic balance, dispersed for 1 hour with a ring mill, and the dispersed pigment was put into a mixing container. After measuring the UV stabilizer using an electronic scale, it was added, and then mixed for 30 minutes at 1500 rpm using a high-speed stirrer.

After setting the temperature of the main part and hardener to 70℃ using Graco's E-10 equipment and Fusion AP Gun, which is a polyurea-only coating equipment, the temperature of the main part and hardener part is set, and then the flat type chamber AF 2020 and the equipment pressure are maintained at 2000psi. The test pieces were prepared by spray coating, cured at room temperature for 7 days, and physical properties were measured and shown in Table 2 below. The physical property test was measured by the hardness test (Shore D) of ASTM 2240 and the elongation, tensile strength, tear strength, and dry to touch test methods of KS F 4922 test.

Referring to Table 2, it can be seen that the higher the NCO% content, the better the hardness, tensile strength, and tear strength. , it can be seen that the elongation is changed, and it can be seen that the hardness, tensile strength, and tear strength are the most excellent in Example 4. Through this configuration, it is possible to compensate for the deterioration of the mechanical properties of the coating film by the addition of the functional powder component in the present invention.

The polyurea compositions of Examples 1 to 12 were prepared according to Table 3 below using the MDI composition of Example 4 (cosmonate PI 31% and cosmonate). (Content: wt%)

Specifically, for manufacturing the main part, Kumho Mitsui's Cosmonate PI (2,4'-MDI: 2,2'-MDI = 50%: 50%), Cosmonate LL (4,4'-MDI) were placed in a 10L glass reactor. ) and Kumho Petrochemical's PPG-2000 were weighed using an electronic scale and then added. Next, after setting the reaction temperature to 80 to 90 ° C, raising and maintaining the temperature, using a stirrer to mix at 40 rpm for 3 hours at revolutions per minute to maintain the reaction, then lowering to 60 ° C. The subject part was prepared by mixing for 30 minutes.

For the preparation of the curing agent, D-2000 and T-5000 (above Huntsman Corporation) as polyamines and DETDA (Albermal Inc.) as a crosslinking agent were weighed and put in a 10L container with an electronic balance. TiO2 pigment and carbon black pigment were weighed with an electronic balance, dispersed for 1 hour with a ring mill, and the dispersed pigment was put into a mixing container. After weighing the UV stabilizer and complex functional powder (a mixture of ceramic hollow pigment, airgel, zeolite, and white charcoal in the same weight ratio), it was added and mixed at 1500 rpm for 30 minutes using a high-speed stirrer.

The prepared main part and curing agent part of Examples 7 to 12 were prepared in the same manner as in Examples 1 to 6, and physical properties were measured and shown in Table 4 below.

Referring to Table 4, the difference in physical properties changes according to the input amount of the flame retardant (TCPP) is clearly shown. In general, as the input amount of the flame retardant and functional composite powder increases, the physical properties may be lowered.

In general, the difference in viscosity between the main part and the curing agent part of the waterproofing material of the polyurea coating film is large. Therefore, in the related art, in order to adjust the viscosity, a plasticizer and a viscosity modifier are used in the main part or a thickener is used in the curing agent to adjust the viscosity. However, in the present invention, since the flame retardant in the main part lowers the viscosity and the functional powder in the curing agent increases the viscosity, the viscosity of the main part and the curing agent can be matched without a separate viscosity modifier. For example, the viscosity of the main part of Example 11 is 600 cps and the curing agent viscosity is 550 cps.

Table 5 below shows the results of functional tests of the polyurea resin compositions of Examples 7 to 12. The test methods are antibacterial test (JIS Z 2801), mold resistance test (ASTM G-21), thermal conductivity test (KS L 9016), vertical flammability test (UL-94 V TEST), flame retardancy test (DIN 4102-2 / CLASS B-2) and far-infrared emissivity test (KFIA-FI-1005) were requested for testing from an authorized testing institute.

Referring to the far-infrared emissivity measurement result, it can be seen that the far-infrared emissivity gradually increases as the amount of the complex functional powder dispersed pigment is increased. However, the multifunctionality is excellent according to the increase in the amount of the complex functional powder, but on the other hand, the mechanical properties may decrease.

Referring to the thermal conductivity measurement result, it can be seen that the thermal conductivity is gradually decreased as the input amount of the complex functional powder dispersed pigment is increased. Therefore, it can be seen that the waterproof coating film formed of the polyurea composition according to the present invention has thermal insulation performance. In addition, the ceramic hollow pigment and zeolite used in the present invention can increase the heat shielding performance of the coating film.

Referring to the measurement results of vertical combustion and flame-retardant performance, it can be seen that the waterproof coating film formed of the polyurea composition according to the present invention has high flame-retardant performance and flame-retardant performance.

In addition, it can be seen that the waterproof coating film formed of the polyurea composition according to the present invention has high antibacterial and antifungal properties, and thus can prevent mold growth due to condensation.

Although described with reference to exemplary embodiments of the present invention as described above, those of ordinary skill in the art may vary the present invention within the scope without departing from the spirit and scope of the present invention described in the claims below. It will be understood that modifications and changes can be made to

The polyurea composition and waterproof construction method according to exemplary embodiments of the present invention may be used for waterproof construction of various structures.

Claims (7)

including a main part and a curing agent part;
The main part comprises an isocyanate prepolymer and a flame retardant,
The curing agent part includes polyetheramine, crosslinking agent, pigment, ceramic hollow pigment, airgel, zeolite, white charcoal, flame retardant and UV stabilizer,
The isocyanate prepolymer is 2,2`-MDI 10 to 20% by weight, 2,4`-MDI 10 to 20% by weight, and 4,4`-MDI 20 to 30% by weight and polypropylene glycol 30 to 60% by weight are reacted and has an NCO% of 14 to 16%,
The content of the functional powder component comprising the ceramic hollow pigment, the airgel, the zeolite and the white charcoal is 3 to 5% by weight based on the total weight of the curing agent part. According to claim 1, wherein the content of the flame retardant in the main part and the curing agent part, respectively, 5% by weight to 10% by weight, the flame retardant is tris (2-chloroethyl) phosphate (Tris (2-chloroethyl) phosphate (Tris (2-chloroethyl) phosphate) ), a multifunctional polyurea composition comprising a. According to claim 1, wherein the crosslinking agent comprises an aromatic amine compound,
The curing agent portion, a multifunctional polyurea composition comprising 55 wt% to 75 wt% of the polyether amine and 20 wt% to 25 wt% of the crosslinking agent. The multifunctional polyurea composition according to claim 3, wherein the crosslinking agent comprises diethyltoluenediamine. According to claim 1, wherein the pigment is carbon black (Carbon black), titanium dioxide (TiO2), iron oxide (Iron oxide yellow) and iron oxide (Iron oxide red) and phthalocyanine green (Phthalocyanine green) from the group consisting of comprising at least one selected
The curing agent part is a multifunctional polyurea composition, characterized in that it comprises 1% to 5% by weight of the pigment. forming an undercoat layer by directly coating the polyurea composition for undercoating on a concrete base surface;
Forming an intermediate layer by coating the multifunctional polyurea composition of any one of claims 1 to 5 on the undercoating layer; and
A waterproof structure construction method comprising the step of coating a urethane composition on the intermediate layer to form a top coat layer. The method of claim 6, wherein the polyurea composition of the intermediate layer is sprayed at a pressure of 2,000 psi to 3,000 psi and a temperature of 65°C to 75°C.

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