KR20240038207A - 2-component polyurea resin paint system for underground parking lot concrete floor with crack responsiveness and waterproofing and its composition - Google Patents

Abstract

The present invention relates to a two-component polyurea resin paint system for concrete floors in underground parking lots and its composition. More specifically, it relates to a two-component polyurea resin paint system for concrete floors in underground parking lots having crack response and waterproofing properties and a composition thereof. will be.

Description

Two-component polyurea resin paint system for underground parking lot concrete floor with crack responsiveness and waterproofing and its composition}

The present invention relates to a two-component polyurea resin paint system for concrete floors in underground parking lots and its composition. More specifically, it relates to a two-component polyurea resin paint system for concrete floors in underground parking lots having crack response and waterproofing properties and a composition thereof. will be.

Because polyurea resin has excellent mechanical properties, it can demonstrate superior durability compared to organic waterproofing materials such as urethane and epoxy. In addition, polyurea resin not only has a fast curing speed, shortening the construction time, but is also more hydrophobic than urethane or epoxy resin, so it can be sprayed directly even on wet or low-temperature surfaces, and has strong heat resistance, widening the application range. It is expanding.

In general, polyurea resins react very quickly, so general mixing and stirring operations are not possible, and as a result, large-scale mechanical equipment at high temperature/high pressure and skilled personnel are required to form polyurea films.

In addition, it has excellent application properties (tensile strength, market rate, etc.), so its scope of use can be expanded, but its high price is problematic, so there are limits to its general use.

The present invention is a slow-curing polyurea paint for concrete floors in underground parking lots that has both crack response and waterproofing properties by securing the optimal film thickness to solve the problems of poor workability due to short curing time and limitations in application as an expensive product. To provide compositions and systems.

According to one embodiment of the present invention, based on the urethane prepolymer, a urethane prepolymer containing polyisocyanate and xylene with an isocyanate group content of 6 to 12% by weight; and a chain extender mixture including aspartic ester with an amine equivalent weight of 279, dimethyl thio-toluene diamine with an amine equivalent weight of 107, and unvulcanized liquid rubber.

The chain extender mixture may further include an antifoaming agent, a dispersant, a moisture absorbent, a pigment, calcium carbonate, barium sulfate, bentonite powder, xylene, and an ultraviolet stabilizer.

The urethane prepolymer contains 0.1 to 5% by weight of xylene, and the chain extender mixture includes 22 to 30 parts by weight of aspartic ester based on 100 parts by weight of the chain extender mixture. 15 to 20 parts by weight of dimethyl thio-toluene diamine; 5 to 8 parts by weight of unvulcanized liquid rubber; 0.1 to 0.5 parts by weight of antifoaming agent; 0.1 to 0.5 parts by weight of dispersant; 1 to 5 parts by weight of moisture absorbent; 10 to 20 parts by weight of pigment; 13 to 16 parts by weight of calcium carbonate; 3 to 7 parts by weight of barium sulfate; 7 to 12 parts by weight of bentonite powder; 2 to 7 parts by weight of xylene; and 0.3 to 0.7 parts by weight of an ultraviolet stabilizer.

The chain extender mixture contains 3 to 4 parts by weight of polyoxypropylenediamine; And it may further include 0.1 to 0.5 parts by weight of a smoothness imparting agent.

Polyisocyanates include hexamethylene diisocyanate (HDI), tetraalkyl xylene diisocyanate, cyclohexane diisocyanate, 1,12-dodecane diisocyanate, 1,4-tetramethylene diisocyanate, 1,3-cyclohexane diisocyanate, 1 ,4-cyclohexane diisocyanate, 1-isocyanate-3,3,5-trimethyl-5-isocyanatemethyl-cyclohexane (isophorone diisocyanate), 4,4′-dicyclohexyl-methane diisocyanate, 2,2 ′- Dicyclohexyl-methane diisocyanate, 2,4′-dicyclohexyl-methane diisocyanate, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 2,4-diphenylmethane diisocyanate, 4 , 4-diphenylmethane diisocyanate, p-phenyline diisoxanate, and polymethylene polyphenyl isocyanate, and the unvulcanized liquid rubber is styrene-butadiene rubber. It may include any one or more selected from the group consisting of SBR), acrylonitrile-butadiene rubber (NBR), polyurethane, and latex.

A mixture of urethane prepolymer and chain extender may be included in a weight ratio of 1:0.6 to 1:1.5.

The urethane prepolymer may further include polyether polyol and functional additives.

According to another embodiment of the present invention, a flooring material made of a polyurea resin composition is provided.

The coating film thickness of the flooring material may be 0.2 to 0.5 mm.

According to another embodiment of the present invention, a surface treatment method of forming a coating film by applying a polyurea resin composition on the surface of concrete, rebar, or a resin layer, wherein the resin layer is an epoxy resin, polyurethane resin, or polyurea. A surface treatment method for an undercoat or middle layer made of resin is provided.

The polyurea resin paint composition for underground parking lots of the present invention has a relatively slow curing speed, has both crack resistance and waterproofing properties for structures, and has excellent adhesion performance with the concrete surface.

In terms of work performance, the polyurea resin paint system of the present invention can be applied not only by spraying, but also by brush, roller, etc., so it can be applied to parking lot floors, waterproofing, corrosion protection, and rust prevention without the need for expensive large spray machines and skilled manpower. Not only is it possible to form a polyurea coating film, but it is also possible to prevent material loss and deterioration of the working environment accompanying the spraying process.

Figure 1 is a side view showing the structure of a conventional flooring system that is vulnerable to cracks due to a lack of elasticity in the upper flooring material.
Figure 2 is a side view showing the structure of a flooring system that has both crack resistance and waterproofing properties according to an embodiment of the present invention.
Figure 3a shows the floating state of the floor coating material during construction after cutting under the pressurized conditions of the system coating test.
Figure 3b shows the floating state of the floor coating material during construction after cutting in the freshwater conditions of the system coating test.
Figure 3c shows the floating state of the floor coating material when cutting after construction under the pressurized conditions of the system coating test.
Figure 3d shows the floating state of the floor coating material when cutting after construction in freshwater conditions of the system coating test.

Hereinafter, the present invention will be described in more detail. Terms or words used in this specification and claims should not be construed as limited to their common or dictionary meanings, and the inventor may appropriately define the concept of terms in order to explain his or her invention in the best way. It should be interpreted with meaning and concept consistent with the technical idea of the present invention based on the principle that it is.

A polyurea resin paint composition according to an embodiment of the present invention includes a base material that is a urethane prepolymer and a curing agent that is a mixture of a chain extender.

The subject urethane prepolymer may include polyisocyanate.

The urethane prepolymer may further include xylene.

The content of isocyanate groups (NCO) in the urethane prepolymer may be 6 to 12% by weight, preferably 8 to 10% by weight, based on the urethane prepolymer.

If the content of the isocyanate group (NCO) of the urethane prepolymer is less than 6% by weight, the hardness of the coating film may be lowered, and if it exceeds 12% by weight, the hardness of the coating film increases, but the pot life may be shortened, making it difficult to control the reaction.

The polyisocyanates are aliphatic and aromatic polyisocyanates, such as hexamethylene diisocyanate (HDI), tetraalkyl xylene diisocyanate, cyclohexane diisocyanate, 1,12-dodecane diisocyanate, 1,4-tetramethylene diisocyanate, 1 ,3-Cyclohexane diisocyanate, 1,4-cyclohexane diisocyanate, 1-isocyanate-3,3,5-trimethyl-5-isocyanatemethyl-cyclohexane (isophorone diisocyanate), 4,4′-dicyclo Hexyl-methane diisocyanate, 2,2'-dicyclohexyl-methane diisocyanate, 2,4'-dicyclohexyl-methane diisocyanate, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 2, It may include any one or more selected from the group consisting of 4-diphenylmethane diisocyanate, 4,4-diphenylmethane diisocyanate, p-phenyline diisocyanate, and polymethylene polyphenyl isocyanate.

Xylene in the urethane prepolymer can control the viscosity of the urethane prepolymer.

The urethane prepolymer may contain xylene in an amount of 0.1 to 5% by weight based on the urethane prepolymer. If it is less than 0.1% by weight, the viscosity is high and leveling properties may be poor during construction after mixing with the chain extender mixture. If it exceeds the viscosity, the viscosity is lowered and the leveling performance is good during construction after mixing with the chain extender mixture. However, the thickness of the coating film is poor and the surface of the coating film hardens at high temperature and humidity, and xylene that cannot escape is volatilized, causing bubbling. It can happen.

The urethane prepolymer may further include polyether polyol and functional additives to impart defoaming performance on its own.

The polyether polyol may be, for example, PP-2000 (KPX polyol) with a molecular weight of 2000, and the functional additive may be, for example, BYK-054 or BYK-Chimie.

The chain extender mixture, which is the curing agent, is an aspartic ester with an amine equivalent weight (molecular weight of the amine compound/number of active hydrogens of the amine) of 279 and an amine equivalent weight of 107. Dimethyl thio-toluene diamine .

The aspartic ester controls pot life and improves the hardness of the coating film, and the dimethyl thio-toluene diamine affects application properties such as pot life control and tensile strength and elongation.

The chain extender mixture may further include unvulcanized liquid rubber, anti-foaming agent, dispersant, moisture absorbent, pigment, calcium carbonate, barium sulfate, bentonite powder, xylene, and ultraviolet stabilizer.

The chain extender mixture is based on 100 parts by weight of the chain extender mixture,

22 to 30 parts by weight of the aspartic ester;

15 to 20 parts by weight of the dimethyl thio-toluene diamine;

5 to 8 parts by weight of the unvulcanized liquid rubber;

0.1 to 0.5 parts by weight of the antifoaming agent;

0.1 to 0.5 parts by weight of the dispersant;

1 to 5 parts by weight of the moisture absorbent;

10 to 20 parts by weight of the pigment;

13 to 16 parts by weight of the calcium carbonate;

3 to 7 parts by weight of the barium sulfate;

7 to 12 parts by weight of the bentonite powder;

2 to 7 parts by weight of the xylene; and

It may include 0.3 to 0.7 parts by weight of the ultraviolet stabilizer.

If the content of the aspartic ester is less than 22 parts by weight, the pot life may be extended but the tensile strength and hardness may decrease, and if the content exceeds 30 parts by weight, the tensile strength and hardness may increase but the pot life may be shortened.

If the content of dimethyl thio-toluene diamine is less than 15 parts by weight, the pot life may be extended, but the tensile strength and elongation may be reduced, and if the content exceeds 20 parts by weight, the tensile strength and elongation may be improved, but the pot life may be shortened. there is.

Considering the hardness of the coating film, it is preferable that the content of the aspartic ester is greater than the content of the dimethyl thio-toluene diamine, and preferably the weight ratio of the aspartic ester and the dimethyl thio-toluene diamine is 65:35. It can be 55:45.

The unvulcanized liquid rubber can not only provide flexibility to the film coated with the polyurea resin paint but also provide slip resistance, and the upper hard urethane coating material (non-slip powder construction) applied on top of the polyurea resin paint has a long shelf life. This is because, even if the polyurea resin surface is exposed to the outside when it becomes longer and peeled off, safety can be ensured by providing an anti-slip effect due to the blended unvulcanized liquid rubber.

The unvulcanized liquid rubber can be any known material as long as it is liquefied without affecting the curing of the polyurea resin composition, preferably styrene-butadiene rubber (SBR), acrylonitrile- It may include any one or more selected from the group consisting of butadiene rubber (acrylonitrile-butadiene rubber, NBR), polyurethane, and latex.

More preferably, it may be styrene-butadiene rubber (SBR) with a styrene content of 23% by weight or more.

If the content of the unvulcanized liquid rubber is less than 5 parts by weight, slip resistance and flexibility may be insufficient, and if it exceeds 8 parts by weight, the tensile strength of the polyurea resin may decrease.

When the content of the antifoaming agent is 0.1 to 0.5 parts by weight, there may be an effect of improving the defoaming performance of bubbles generated when mixing and stirring the urethane prepolymer, which is the main agent, with the chain extender, which is a curing agent. For example, the antifoaming agent is BYK. -054, EFKA-2020, BYK-535 (product name), etc. can be used.

When the content of the dispersant is 0.1 to 0.5 parts by weight, the dispersion performance of the chain extender mixture can be improved. For example, the dispersant includes BYK-110, BYK-9076, BYK-161 (brand name), etc. can be used

When the content of the moisture absorbent is 1 to 5 parts by weight, moisture absorption can be increased during curing of the polyurea resin paint composition coating film, thereby increasing the mechanical properties of the coating film, and is preferably included in 3 to 4 parts by weight. For example, SILIPORITE SA-1720 (brand name), etc. may be used as the moisture absorbent.

When the content of the pigment is 10 to 20 parts by weight, it displays the color of the polyurea resin coating film and can act as a filler. The pigment may include an inorganic pigment such as TiO ₂ and an organic pigment, and may be dispersed in a polyol such as propylene glycol. Preferably, the pigment may be a white pigment.

When the content of calcium carbonate is 10 to 20 parts by weight, the hardness of the polyurea resin coating film can be improved and the hiding power can be increased. Preferably, the content of calcium carbonate may be 13 to 16 parts by weight.

When the content of barium sulfate is 2 to 10 parts by weight, it is possible to impart a slimming property to the polyurea resin paint film. Preferably, the content of barium sulfate may be 3 to 7 parts by weight.

When the content of the bentonite powder is 7 to 12 parts by weight, the hiding power of the polyurea resin paint film can be increased and solid content can be prevented from settling.

When the content of xylene is 2 to 7 parts by weight, the dispersibility of the chain extender mixture can be improved and workability can be improved. Preferably, the content of xylene may be 2 to 5 parts by weight. .

When the content of the ultraviolet stabilizer is 1 part by weight or less, deterioration of the polyurea resin coating film can be suppressed and adhesion to other layers can be improved. Preferably, the content of the ultraviolet stabilizer may be 0.3 to 0.7 parts by weight, For example, the ultraviolet stabilizer may be TINUVIN B97, TINUVIN 292, ZIKA-UVS3 (brand name), etc.

The chain extender mixture, which is the curing agent, may further include polyoxypropylenediamine and a smoothness imparting agent (leveling agent).

When the content of polyoxypropylenediamine is 5 parts by weight or less, the elongation of the polyurea resin coating film can be increased, and when it exceeds 5 parts by weight, the curing time may excessively increase and hardness may decrease, preferably The content of polyoxypropylenediamine may be 3 to 4 parts by weight.

When the content of the smoothness imparting agent (leveling agent) is 0.1 to 0.5 parts by weight, the flatness of the polyurea resin coating film can be increased. For example, the smoothness imparting agent is BYK-306, BYK-320, BYK-354 ( product name), etc.

When the urethane prepolymer and chain extender mixture is mixed at 1:0.6 to 1:1.5 parts by weight, it improves the hardness of the polyurea resin coating film and ensures sufficient pot life because the curing time is not excessive, preferably 1. It can be mixed at a ratio of :0.8 to 1:1.1 parts by weight.

A flooring material according to another embodiment of the present invention is composed of a polyurea resin paint composition containing a mixture of the urethane prepolymer, which is the subject matter, and a chain extender, which is a curing agent.

The coating film thickness of the flooring material may be 0.2 to 0.5 mm.

Despite its thin thickness, the flooring material has excellent crack resistance and waterproofing properties.

In detail, as shown in Figure 2, it may have a structure in which the reinforced concrete (structure) 105, the base coat (primer) 102, the middle coat (101), and the top coat (coating) 100 are stacked in that order, The polyurea resin paint may be medium (101).

Through this, the middle layer has elasticity (crack resistance), serves as an insulating layer that offsets the tensile stress generated in concrete, and has waterproof properties to prevent moisture that may occur on the parking lot flooring from penetrating into the concrete layer. .

On the other hand, like the conventional structure shown in Figure 1, reinforced concrete (structure) 105, drainage plate 104, plain concrete (103), base coat (primer) 102, middle coat (101), top coat (coating) (100) ) are stacked in order, there is a problem in that the cracks 200 that occur in the lower part of the concrete affect the upper flooring, causing cracks to occur in the upper flooring, and a drain plate must be installed for drainage.

A surface treatment method according to another embodiment of the present invention relates to a method of forming a coating film by applying the polyurea resin composition.

The surface treatment method includes stirring the urethane prepolymer and the chain extender mixture;

The mixture of the stirred chain extender mixture and urethane prepolymer is applied to the object to be coated, and is cured over time (isocyanate group and amine group react) to form a polyurea resin coating film,

The coated object may be concrete, rebar, a resin layer, etc., and the resin layer may be an undercoating layer (primer layer) or a middle layer, and the undercoat layer and middle layer may be made of an epoxy resin, polyurethane resin, or polyurea resin. there is.

The thickness of the polyurea resin coating film may be 0.2 to 0.5 mm.

Since the curing speed of the polyurea resin composition is relatively slow, the surface treatment method can be applied not only by spraying, but also by brush, roller, etc., so it is waterproof, anti-corrosive and rust-proof without the need for an expensive large-scale spraying machine and skilled manpower. Not only is it possible to form a functional polyurea coating film, but it is also possible to prevent material loss and deterioration of the working environment accompanying the spraying process.

Exemplary embodiments are described in more detail through the following examples and comparative examples. However, the examples are only for illustrating the technical idea and do not limit the scope of the present invention.

1. Comparison of physical properties of examples and comparative examples

(1) Preparation of urethane prepolymer composition

The main urethane prepolymer composition was prepared using the ingredients shown in Table 1 below in the indicated amounts. (Unit: weight%)

Composition ingredients content(%) Hexamethylene diisocyanate prepolymer 97 xylene 2.9 Functional additives (BYK-054, BYK-Chemie) 0.1

Here, the functional additive with defoaming performance was used.

(2) Example - Preparation of chain extender composition

Curing agent compositions 1 to 5 were prepared by uniformly mixing the ingredients shown in Table 2 below at the indicated amounts using a mixer. (Unit: weight%)

Composition ingredients Chain extender composition Example 1 Example 2 Example 3 Example 4 Example 5 Aspartic ester
(Product name: Desmophen NH-1420) 26.0 25.0 24.0 27.0 28.0 Dimethylthiotoluenediamine (Product name: Ethacure 300) 16.6 17.1 19.1 15.6 15.6 Polyoxypropylenediamine
(Product Name: JEFFAMINE D-2000) 4.0 4.0 3.0 3.0 3.0 Unvulcanized liquid rubber 8.0 6.0 7.0 6.0 5.0 Defoamer (Product name: BYK-054) 0.3 0.3 0.3 0.3 0.3 Smoothness imparting agent (Product name: BYK-306) 0.3 0.3 0.3 0.3 0.3 Dispersant (Product name: BYK-9076) 0.3 0.3 0.3 0.3 0.3 moisture absorbent
(Product name: SILIPORITE SA-1720) 4.0 4.0 3.0 3.0 3.0 White pigment (Product name: PRETIOX RGU) 10.0 10.0 10.0 10.0 10.0 ground calcium carbonate 14.0 16.0 15.0 13.0 14.0 barium sulfate 7.0 6.0 5.0 5.0 5.0 bentonite powder 7.0 8.0 9.0 12.0 10.0 xylene 2.0 2.5 3.5 4.0 5.0 UV Stabilizer (Product Name: TINUVIN B97) 0.5 0.5 0.5 0.5 0.5 Total weight of chain extender (g) 100 100 100 100 100 Weight ratio (chain extender/isocyanate) 1/0.9 1/0.8 1/0.7 1/1 1/1

(3) Comparative example - Preparation of chain extender composition

Comparative example chain extender compositions 1 to 3 were prepared in the same manner as in Example 1, except that the ingredients shown in Table 3 below were used.

Composition ingredients Chain extender composition Comparative Example 1 Comparative example 2 Comparative Example 3 Aspartic ester
(Product name: Desmophen NH-1420) 26.0 25.0 24.0 Dimethylthiotoluenediamine (Product name: Ethacure 300) 17.6 17.1 19.1 Polyoxypropylenediamine
(Product Name: JEFFAMINE D-2000) 4.0 4.0 3.0 Defoamer (Product name: BYK-054) 0.3 0.3 0.3 Smoothness imparting agent (Product name: BYK-306) 0.3 0.3 0.3 Dispersant (Product name: BYK-9076) 0.3 0.3 0.3 moisture absorbent
(Product name: SILIPORITE SA-1720) 4.0 4.0 3.0 White pigment (Product name: PRETIOX RGU) 15.0 15.0 15.0 ground calcium carbonate 16.0 17.0 17.0 barium sulfate 7.0 6.0 5.0 bentonite powder 7.0 8.0 9.0 xylene 2.0 2.5 3.5 UV Stabilizer (Product Name: TINUVIN B97) 0.5 0.5 0.5 Total weight of chain extender (g) 100 100 100 Weight ratio (chain extender/isocyanate) 1/0.9 1/0.8 1/0.7

(4) Evaluation example

After stirring the chain extender mixture and the isocyanate mixture for 3 minutes according to the specified mixing ratio, a coating film was formed on a polyethylene plate with a thickness of about 2.0 mm, and then the physical properties (gel time, tack free time, tensile strength, hardness) were measured. was measured and shown in Table 4 below.

Specifically, tensile strength was measured using a universal tensile tester, and hardness was measured using a Shore A hardness tester. Slip resistance was measured with a BPN measuring device, and abrasion resistance was measured using a Tabber abrasion tester after being worn for a certain period of 1 hour and the reduced weight of the coating film. The adhesion with the top coat was examined after exposure to light for a certain period of time, applying the top coat, curing, cutting using a cross cutter, attaching and removing the tape, and observing whether peeling occurred. Because the pot life generates heat, the time to reach 20,000 cps was measured using a rotational viscometer.

Seal
robbery
(N/mm2) elongation rate
(%) Hardness
(Shore A) slip
resistance
(BPN) wear resistance
(Loss, H-22, mg) Adhesion to topcoat pot life
(25℃,
100g, min) curing time
(25℃, 2mm,
hour) concrete
package Example 1 12 310 83 65 43 Good 33 5 Example 2 12 320 81 63 45 Good 32 5 Example 3 13 340 80 63 47 Good 33 4 Example 4 11 290 83 63 45 Good 35 6 Example 5 11 300 84 60 40 Good 35 6 Comparative Example 1 12 240 83 52 52 Good 32 5 Comparative example 2 11 250 81 50 50 Good 30 5 Comparative Example 3 11 250 81 51 53 Good 32 6

From the above-described experimental results, when constructed in a parking lot using the reaction-controllable polyurea resin composition having slip resistance of the present invention and the surface treatment method using the polyurea resin composition, the tensile strength compared to the comparative example (our existing product) is similar, but the elongation rate has improved by 20% to 40%. This shows that it has excellent followability to the movement of the structure when applied as a parking lot flooring material, and it can be said that crack response has been improved. In particular, there is a large difference in slip resistance of 15% to 39% depending on whether it is used or not. If the anti-slip particles included in the topcoat are lost and exposed, it can cause a serious accident if the floor is wet. However, in this experiment, it was found that an improvement effect was observed.

In the physical property comparison test, Example 3, which had the best physical properties, was selected and the following test was conducted.

2. Crack responsiveness test

A polyurea resin paint composition was prepared by mixing the urethane prepolymer, which is the main ingredient of the composition in Table 1, with the chain extender mixture of the composition of Example 3, and then the crack correspondence by coating film thickness was measured and shown in Table 5.

division 200㎛ 300㎛ Breaking point (mm) 0.8 1.25 Actual film thickness (㎛) 163 283.5

It can be seen that the thicker the polyurea resin coating film, the longer the fracture length becomes, and the better the crack response.

3. Durability test

A polyurea resin paint composition was prepared by mixing the urethane prepolymer, which is the subject of the composition in Table 1, and the curing agent, which is the chain extender mixture of the composition of Example 3. Then, test pieces suitable for durability testing were produced and tested, and the results are shown in Table 6. .

division Polyurea 300㎛ Top coat adhesion evaluation 1st (MPa) KS F 4937: 1.2 MPa or more 1.6 Top coat adhesion evaluation 2nd (MPa)
* X-cut comparison test (ASTM D3359) 24hrs 1.6 (*Good) 48hrs 1.5 (*Good) 72 hours 1.6 (*Good) 96hrs 1.5 (*Good) Fatigue resistance evaluation (2.0±0.3mm, KS standard)
KS F 4922 There shall be no punctures, tears, fractures or wrinkles in the coating film in any test specimen. -10 degrees / 2.5mm / 2,000 times clear Repeated hot and cold test (5 Cycle, MPa) KS F 4716 No grinding, swelling or peeling, adhesion
Strength must be over 1.1MPa 1.3 Repeated hot/cold test (10 Cycle, MPa) same as above 1.8 Watertight performance evaluation (0.3MPa / 3 hours) Pitcher Crack response evaluation after accelerated weathering (250H) (mm) 3.75 Mass reduction rate (%) after abrasion test (1,000 times) Korea Landscape Pavement Industry Cooperative Cooperative Film Type Flooring Group Standard SPS-F KSPICKTS-00107188 (2020) Applicable: Wear loss 200mg or less
Compliant with Korea Paint Ink Industry Cooperative group standard KPIC 1009 (based on wear-resistant epoxy paint): Abrasion loss 120 mg or less 0.64
(about 26mg)

In the KS F 4937 (surface finishing material for parking lot floors) quality standard, the adhesion strength to the base surface is 1.2N/㎟ or more. When this standard is applied, the first evaluation of adhesion to the top coat and the second evaluation of top coat adhesion by time are performed. All were able to obtain good results.

It was confirmed that there were no abnormalities in the fatigue resistance performance evaluation, and the KS quality standards for hot and cold repeated tests only check the presence or absence of cracks and deformation. However, in this evaluation, as a result of quantitatively evaluating the adhesion performance, a result of 1.3 to 1.8 MPa was obtained. . As a result of prediction based on these results, it is judged that this product is suitable for parking lot use as it has crack resistance and waterproofing properties.

As a result of the watertight performance evaluation, it was confirmed that it was not permeable, which was the standard, and good results were obtained in the crack response evaluation and abrasion resistance test after accelerated weathering.

4. Chemical resistance test

After preparing a polyurea resin paint composition by mixing the urethane prepolymer, which is the subject of the composition in Table 1, and the curing agent, which is the chain extender mixture of the composition of Example 3, a test piece suitable for a chemical resistance test according to KS F 4922 (polyurea resin coating waterproofing material) was prepared. Manufacturing and testing were carried out, and the results are shown in Table 7.

division Polyurea (300㎛) Tensile strength (N/㎟) Elongation rate (%) Untreated specimen 16.6 425 acid treated specimen 15.7 (94.6%) 347 Sodium chloride treated test specimen 17.0 (102.4%) 411 Alkaline treated test specimen 16.3 (98.2%) 350

Tensile strength ratio: <KS standard> 80% or more and 150% or less

As a result of the test, in the case of acid treatment compared to untreatment, 94.6% was obtained, which is within the standard range of 80% to 150%, and other sodium chloride and alkali treatments also showed results within the standard.

5. System coating test (undercoat primer 50㎛ + mid-coat polyurea 300㎛ + top coat high-hardness urethane coating 60㎛)

In accordance with this patented system, for the purpose of evaluating the possibility of defects occurring after construction, we proceeded with cutting the base surface and then cutting the surface after construction. Pressurized conditions and fresh water conditions were applied to evaluate the waterproof performance. The results are shown in Table 8. showed.

Evaluation of defect occurrence Pressurization conditions Freshwater conditions Installation after cutting (MPa) 2.52 2.27 No lifting or peeling of the coating material No lifting or peeling of the coating material Cutting after construction (MPa) 1.99 1.86 No lifting or peeling of the coating material No lifting or peeling of the coating material

(Pressurization after cutting: Figure 3a, Fresh water after cutting: Figure 3b, Pressurization after cutting: Figure 3c, Fresh water after cutting: Figure 3d)

As a result of the test, it was confirmed that excellent results were shown both during construction after cutting the surface and when cutting after construction.

6. Field workability evaluation test (primary composition)

Since this patented system uses thin film coating, leveling and hiding power that may occur during construction are important factors, so it was set as an evaluation item for field workability, and the results are shown in Table 9.

Evaluation items result note Leveling ability 2
(weak wave pattern) Appearance judgment Concealment power 2
(Repair area on the base surface is revealed) Appearance judgment

Remarks) Judgment criteria: 1: Insufficient 2: Somewhat inadequate 3: Average 4: Good 5: Excellent

As can be seen from the above test results, Example 3 was selected and tested to meet the required physical properties, but since this patented system uses thin film coating, it produced insufficient results in leveling and hiding power as confirmed in Table 9.

7. Secondary composition performance test

Additional experiments were conducted to resolve workability problems that occurred in the first composition.

Curing agent compositions 6 to 8 were prepared by uniformly mixing the ingredients shown in Table 10 below at the indicated amounts using a mixer. (Unit: weight%)

For hardener compositions 6 to 8, only the composition content was changed based on Comparative Example 4 (Example 3).

(1) Comparative Examples and Examples - Preparation of chain extender composition

Composition ingredients Chain extender composition Comparative example 4
(Example 3) Example 6 Example 7 Example 8 Aspartic ester
(Product name: Desmophen NH-1420) 24.0 24.0 24.0 24.0 Dimethylthiotoluenediamine (Product name: Ethacure 300) 19.1 19.1 19.1 19.1 Polyoxypropylenediamine
(Product Name: JEFFAMINE D-2000) 3.0 3.0 3.0 3.0 Unvulcanized liquid rubber 7.0 7.0 7.0 7.0 Defoamer (Product name: BYK-054) 0.3 0.3 0.3 0.3 Smoothness imparting agent (Product name: BYK-306) 0.3 0.3 0.3 0.3 Dispersant (Product name: BYK-9076) 0.3 0.3 0.3 0.3 moisture absorbent
(Product name: SILIPORITE SA-1720) 3.0 3.0 3.0 3.0 White pigment (Product name: PRETIOX RGU) 10.0 12.0 13.0 14.0 ground calcium carbonate 15.0 14.0 15.0 14.0 barium sulfate 5.0 3.5 3.0 3.0 bentonite powder 9.0 9.0 8.0 7.0 xylene 3.5 4.0 3.5 4.5 UV Stabilizer (Product Name: TINUVIN B97) 0.5 0.5 0.5 0.5 Total weight of chain extender (g) 100 100 100 100 Weight ratio (chain extender/isocyanate) 1/0.7 1/0.7 1/0.7 1/0.7

(2) Evaluation example

After stirring the chain extender mixture and the isocyanate mixture for 3 minutes according to the specified mixing ratio, a coating film was formed on a polyethylene plate with a thickness of about 2.0 mm, and then the physical properties (gel time, tack free time, tensile strength, hardness) were measured. was measured and shown in Table 11 below.

Seal
robbery
(N/mm2) elongation rate
(%) Hardness
(Shore A) slip
resistance
(BPN) wear resistance
(Loss, H-22, mg) Adhesion to topcoat pot life
(25℃,
100g, min) curing time
(25℃, 2mm,
hour) concrete
package Example 6 13 340 83 62 46 Good 33 5 Example 7 13 330 81 63 45 Good 32 5 Example 8 13 330 80 63 47 Good 33 5 Comparative example 4 13 330 80 62 47 Good 32 5

Curing agent example compositions 6 to 8 were tested based on Comparative Example 4 by adjusting only the content of pigment, calcium carbonate, bentonite, which is the main factor affecting hiding power, and barium sulfate, which gives the thickness of the coating film, and the pot life other than tensile strength was tested. There was no significant difference in overall workability and application properties, such as adhesion.

Table 12 shows the test results of the secondary composition that supplemented the leveling and hiding power that were judged to be insufficient in the primary composition.

Comparative example 4 Example 6 Example 7 Example 8 Polyurea 300㎛ Leveling ability 2 3 3 4 Concealment power 2 3 3 4 Polyurea 400㎛ Leveling ability 2 4 3 5 Concealment power 3 4 3 5

Remarks) Judgment criteria: 1: Insufficient 2: Somewhat inadequate 3: Average 4: Good 5: Excellent

As can be seen from the above test results, the leveling properties and hiding power of Examples 6 to 8 were improved compared to Comparative Example 4 (primary composition - Example 3). In particular, in the case of Example 8, the film thickness was reduced to 400㎛ for optimization. It was found that leveling and hiding power were improved during painting.

8. Tests for crack response, adhesion strength, etc.

Example 8 was selected and the performance of the urea system 0.4mm was evaluated according to the KS F 4922 and KS F 4937 quality standard evaluation methods, and is shown in Table 13 below.

division Urea system: 0.4mm note Crack response (mm): Medium + top coat construction conditions Average: 8.40 (0.44mm) Application evaluation Tensile strength (MPa)
/ Elongation rate (%) Low+Medium 22.6 (385.9%) KS F 4922 Medium + high 8.2 (162%) Adhesion strength
(MPa) Low+Medium 2.1 (mother system interface) KS F 4937 Top coat adhesion
(Bottom coat + middle coat + top coat) Construction within 24 hours 2.4 (mother system interface) Construction within 48h 1.9 (mother system interface) Construction within 72h 2.0 (mother system interface) Construction within 96h 2.3 (mother system interface)

Remarks: KS F 4922 quality standard: 1.5 MPa or more, KS F 4937 quality standard: 1.2 MPa or more.

As a result of the test, excellent crack response, tensile strength, and adhesion strength were confirmed.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and variations are possible without departing from the technical spirit of the present invention as set forth in the claims. This will be self-evident to those with ordinary knowledge in the field.

100: Top coat (coating)
101: Moderate
102: Undercoat (primer)
103: Plain concrete
104: Drain plate
105: Reinforced concrete (structure)
200: crack

Claims (10)

Based on the urethane prepolymer, a urethane prepolymer containing polyisocyanate and xylene with an isocyanate group content of 6 to 12% by weight; and
A polyurea resin coating composition comprising an aspartic ester with an amine equivalent weight of 279, dimethyl thio-toluene diamine with an amine equivalent weight of 107, and a chain extender mixture containing unvulcanized liquid rubber.
According to clause 1,
The chain extender mixture is a polyurea resin composition further comprising an antifoaming agent, a dispersant, a moisture absorbent, a pigment, calcium carbonate, barium sulfate, bentonite powder, xylene, and an ultraviolet stabilizer.
According to clause 2,
The urethane prepolymer contains 0.1 to 5% by weight of xylene,
The chain extender mixture is based on 100 parts by weight of the chain extender mixture,
22 to 30 parts by weight of the aspartic ester;
15 to 20 parts by weight of the dimethyl thio-toluene diamine;
5 to 8 parts by weight of the unvulcanized liquid rubber;
0.1 to 0.5 parts by weight of the antifoaming agent;
0.1 to 0.5 parts by weight of the dispersant;
1 to 5 parts by weight of the moisture absorbent;
10 to 20 parts by weight of the pigment;
13 to 16 parts by weight of the calcium carbonate;
3 to 7 parts by weight of the barium sulfate;
7 to 12 parts by weight of the bentonite powder;
2 to 7 parts by weight of the xylene; and
A polyurea resin composition comprising 0.3 to 0.7 parts by weight of the ultraviolet stabilizer.
According to clause 3,
The chain extender mixture contains 3 to 4 parts by weight of polyoxypropylenediamine; and
A polyurea resin composition further comprising 0.1 to 0.5 parts by weight of a smoothness imparting agent.
According to clause 1,
The polyisocyanate is hexamethylene diisocyanate (HDI), tetraalkyl xylene diisocyanate, cyclohexane diisocyanate, 1,12-dodecane diisocyanate, 1,4-tetramethylene diisocyanate, 1,3-cyclohexane diisocyanate, 1,4-cyclohexane diisocyanate, 1-isocyanate-3,3,5-trimethyl-5-isocyanatemethyl-cyclohexane (isophorone diisocyanate), 4,4′-dicyclohexyl-methane diisocyanate, 2, 2′-dicyclohexyl-methane diisocyanate, 2,4′-dicyclohexyl-methane diisocyanate, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 2,4-diphenylmethane diisocyanate, Contains at least one selected from the group consisting of 4,4-diphenylmethane diisocyanate, p-phenyline diisocyanate, and polymethylene polyphenyl isocyanate,
The unvulcanized liquid rubber includes at least one selected from the group consisting of styrene-butadiene rubber (SBR), acrylonitrile-butadiene rubber (NBR), polyurethane, and latex. Polyurea resin composition.
According to clause 1,
A polyurea resin composition comprising the urethane prepolymer and the chain extender mixture at a weight ratio of 1:0.6 to 1:1.5.
According to clause 1,
The urethane prepolymer is a polyurea resin composition further comprising polyether polyol and a functional additive.
A flooring material made of the polyurea resin composition according to any one of claims 1 to 7.
The flooring material of claim 8, wherein the coating film thickness of the flooring material is 0.2 to 0.5 mm.
A surface treatment method of forming a coating film by applying the polyurea resin composition according to any one of claims 1 to 7 on the surface of concrete, rebar, or a resin layer,
The surface treatment method wherein the resin layer is an undercoat or middle layer made of epoxy resin, polyurethane resin, or polyurea resin.