KR102675175B1 - Urethane primer composition for polyurea waterproof coating and coating method using the same - Google Patents

Abstract

The purpose of the present invention is to provide a novel urethane intermediate composition used in primer layer work for polyurea rooftop waterproofing, with a significantly shortened curing time and to provide a urethane intermediate composition for polyurea rooftop waterproofing that can be used by spraying. For this purpose, as the subject (10), a first polyether polyol with a divalent hydroxy functional group having an average molecular weight of 2000, a second polyether polyol having an average molecular weight of a divalent hydroxy functional group of 3000, and a third polyether polyol having an average molecular weight of a trivalent hydroxy functional group of 4000. polyether polyol; crosslinking agent; body pigments such as calcium carbonate (CaCO ₃ ); antifoaming agent; and color pigment paste; The base material (10) is mixed, and as the curing agent (20), a fifth polyether polyol having an average molecular weight of a divalent hydroxy functional group of 1000, a sixth polyether polyol having an average molecular weight of a divalent hydroxy functional group of 2000, and a hydroxy functional group. A seventh polyether polyol having a trivalent average molecular weight of 4000; Among diisocyanates, TDI and Monomeric MDI; exempt solvent; and a viscosity regulator that doubles as a plasticizer; The hardener (20) is mixed by mixing, and the base material (10) and the hardener (20) are mixed at a weight ratio of 0.7 to 1.5:1.

Description

Urethane intermediate composition for polyurea rooftop waterproofing and construction method using the same {URETHANE PRIMER COMPOSITION FOR POLYUREA WATERPROOF COATING AND COATING METHOD USING THE SAME}

The present invention relates to a urethane intermediate composition for polyurea rooftop waterproofing and a polyurea rooftop waterproofing construction method using the same. More specifically, a urethane intermediate composition for polyurea rooftop waterproofing that has a reliable waterproofing effect and is capable of efficient waterproofing work, and a polyurethane intermediate composition using the same. This is about the urea rooftop waterproofing construction method.

In general, concrete has good compressive strength, acid resistance, alkali resistance, chemical resistance, and UV resistance, but as the period of use passes, the strength decreases due to substances containing impurities such as acids/alkali and organic substances, and curing is difficult. Microcracks that occur irregularly, poor workmanship at joints, and cracks caused by external forces cause water leaks, and when corrosion worsens, even buried rebars are corroded, severely deteriorating the durability of the structure, thereby impairing the function of the concrete structure. There is a problem with damaging it.

In particular, the slab roof of a building is exposed to the harshest external environmental conditions among buildings, so reliable waterproof coating construction is required. Recently, among various materials, it boasts excellent adhesion ability with a fast chemical reaction time, and has high elongation ability and tensile strength. An excellent polyurea waterproofing agent is used. For reference, polyurea waterproofing is more than 10 times more durable than urethane waterproofing, which is a common rooftop waterproofing, and more than 3 times more durable than solvent-free epoxy. The minimum lifespan is about 20 years, so cracks or splitting do not occur, and it is anti-corrosive, rust-proof, and acid-resistant. , it is a material with excellent cold resistance, durability, heat resistance, and wear resistance.

This polyurea waterproof coating construction method initially forms an elastic and smooth coating film with excellent rust prevention and chemical resistance, and by controlling the spray angle, embossing is formed on the surface of the coating film, providing anti-slip and good aesthetic functions, and improving reactivity and curing speed. Since it is very fast, a coating method of applying polyurea resin directly to concrete was used (first prior art).

However, in the case of the first prior art construction method of directly applying the polyurea resin to the concrete structure, there was a problem in that the water tightness of the concrete was poor, causing pinholes to occur and the surface to be uneven.

Therefore, in order to overcome the problem of pinhole generation in the first prior art, the construction was performed by paving with non-woven fabric or asphalt sheet and urethane resin before painting the polyurea resin (second prior art).

However, the non-woven fabric or asphalt sheet packaging method of the second prior art has the disadvantage that the process is cumbersome, the surface of the non-woven fabric may become rough due to the coating material provided on the non-woven fabric, and the coating material components are quickly absorbed into the non-woven fabric, resulting in poor constructability. There is.

Meanwhile, in order to overcome the problems of the first prior art, a waterproof coating method using the urethane resin as a base conditioner was attempted (third prior art).

In the third prior art, a urethane resin with a slow curing time is used as a base conditioner. The urethane resin forms a coating film through a reaction between a polyol-based compound and an isocyanate, and an appropriate catalyst and curing agent are used in the reaction. In general, the urethane resin has a slow curing time and a self-leveling function. The self-leveling function is to form a base conditioner layer that is a smooth coating film because the polyurethane has fluidity.

Accordingly, the method of using urethane resin as a base conditioner has the disadvantage that the urethane resin cannot be painted when the construction surface is wet, and when the urethane resin is applied to the construction surface in a wet state, the waterproof coating material is applied to the construction surface. There is a problem in that the coating material lifts or cracks occur due to poor adhesion to the surface and poor response to the behavior of the base surface.

Accordingly, in order to solve the problems of the first to third prior arts, Republic of Korea Patent No. 10-0956489 (Polyurea waterproof coating method for concrete structures) (fourth prior art) was proposed. 4 The prior art will be described with reference to FIG. 1.

In the polyurea waterproof coating method for a concrete structure according to the fourth prior art, after surface treatment of the bottom layer (10), a primer layer (20), a coating layer (30), and a coating layer (40) are sequentially formed. It proceeds from the first to the fourth steps.

The first step is to surface treat the bottom layer 10 of the concrete structure. The surface treatment involves removing laitance, pinholes, etc. from the bottom layer 10 of the concrete structure using a water jet and a power tool, and removing the laitance and pinholes from the bottom layer 10 of the concrete structure. To reinforce cracks, water leaks, and water in the bottom layer (10), and to facilitate primer penetration into the bottom layer (10) of the concrete structure and adhesion to the base conditioner, vacuum and dry the bottom layer (10). Dust is removed using high pressure air.

That is, in order to coat the bottom layer 10 of the concrete structure in a waterproof manner, first, oil, salt, moisture, dust, and other foreign substances on the surface of the bottom layer 10 must be removed, and if the oil is present, Remove using thinner.

The second step is to form a primer layer 20 on the entire surface-treated bottom layer 10. Forming the primer layer 20 fixes foreign substances present on the surface of the bottom layer 10 of the concrete structure. This is to improve the adhesion with the coating layer 30 of the base conditioner to be applied subsequently by blocking the concrete pores and strengthening the concrete by infiltrating the primer into the pores of the concrete.

At this time, the primer layer 20 is a two-component water-soluble epoxy primer made of, for example, an epoxy resin as the main agent and a polyamide resin as a hardener so that the bottom layer 10 of the surface-treated concrete structure can be painted using a roller or spray. was used. For the two-component water-soluble epoxy primer, the epoxy resin as the main agent and the polyamide resin as the curing agent are weighed at a mass ratio of 4:1 and placed in a mixing container, then first stirred using an electric stirrer, and then the stirred mixed solution is mixed. It is made by adding 15 to 20 parts by weight of water (fresh water) to 100 parts by weight and sufficiently remixing it with an electric stirrer, and this is painted on the bottom layer (10).

In addition, it is preferable that the coating thickness of the primer layer 20 according to the application of the two-component water-soluble epoxy primer is within the range of 0.05 to 0.15 mm. This is because drying is very slow when the thickness of one coating is 0.2 mm or more. This is because, even if more than a period of time passes, the coating film may slip, and if it is applied excessively beyond 0.3 mm, cracks may occur.

That is, when painting the two-component water-soluble epoxy primer, partial painting is performed with a tool such as a brush, partial or full painting is performed with a roller, and full painting is performed with an airless spray, and the nozzle The diameter and injection pressure can be changed depending on working conditions.

The third step coating layer 30 is formed by applying a base conditioner on the primer layer 20, and the base conditioner is used to treat normal pores, depressions, etc. on the surface of the bottom layer 10. It is a three-component type consisting of water-soluble epoxy resin, hardener (cement), and powder (silica sand).

At this time, the mixing ratio of the water-soluble epoxy resin, hardener (cement), and powder (silica sand) constituting the three-component base conditioner is measured by weight ratio, and for 8 parts by weight of powder, 1 part by weight of water-soluble epoxy resin and 2.5 parts by weight of hardener are mixed in a mixing container. After being added, the powder is completely loosened with a power stirrer and stirred sufficiently until it becomes a uniform liquid, and this mixed liquid is plastered using tools such as a trowel to form a primer layer (10) on the bottom layer 10 of the concrete structure. 20) is to be constructed smoothly.

On the other hand, when forming the coating layer 30 by painting the three-component base conditioner mixed as described above, the thickness is maintained at 0.5 mm to 1.0 mm and can be applied more than once, and can be re-coated 1 day after application. and follow-up processes are possible.

That is, when painting the background conditioner, first, partial repair is performed to smooth out the pinholes and bubbles that occur during the formation of the primer layer 20, and then using hand tools. to remove contaminants.

Next, the coating layer 30 is formed by coating the entire surface of the primer layer 20 with a three-component background conditioner.

Finally, forming the coating layer 40 in the fourth step is achieved by spraying a coating material containing an ultra-fast curing polyurea resin on the coating layer 30 formed in the third step.

In other words, the coating layer 40 provides an ultra-fast curing polyurea resin in the form of a coating composition, and the polyurea resin is a two-component coating material containing an isocyanate prepolymer as component A and a curing agent that is a polyamine mixture as component B. It is coated.

Here, the polyurea resin used is an ultra-fast curing resin, and the high-temperature, high-pressure spray coating dries within seconds, making it possible to walk within 5 minutes after application. It is not affected by temperature and humidity, so it has excellent curing performance even at low temperatures. This significantly improves workability, and by adjusting the spray angle when applying the spray, an embossing effect is provided to the surface of the coating layer 30, thereby minimizing slip resistance and friction noise.

At this time, it is preferable to apply the two-component coating material on the coating layer 30 using a spray gun using dedicated equipment, the thickness of which is within the range of 1.5 mm to 2.0 mm, and hardening is measured with a Shore A hardness meter. It should be 85 or more, and the tensile strength is 200±30kgf/cm2, the tear strength is 100±15kgf/cm, and the elongation rate is preferably 300% or more.

In the fourth prior art, the bottom layer (10) of the concrete structure is surface treated before forming the coating layer (40) containing polyurea resin, which is an ultra-fast curing resin, and then a primer layer (20) and a coating layer (30) are sequentially applied thereon. Since it is formed as is, this not only prevents pinholes from occurring, but also prevents the adhesion performance from deteriorating even if the bottom layer 10 of the concrete structure is wet, and thus the bottom layer 10 of the concrete structure ), it is possible to maximize the stability and excellence of the waterproof/anticorrosive coating.

However, in the case of the fourth prior art, the primer layer 20 has no choice but to be constructed with a thickness of 0.05 to 0.15 mm, and the coating layer 30 has no choice but to be constructed with a thickness of 0.5 to 1.0 mm. The reason is that, as mentioned above, when the thickness of a single coat is 0.2 mm or more, drying is very slow and the coating film may slip off even after 24 hours or more.

On the other hand, as a polyurethane coating waterproofing technology that improves the curing speed of the waterproofing agent, Republic of Korea Patent No. 10-1310615 (polyurethane coating waterproofing composition and spray-type coating method using the composition) is disclosed as the fifth prior art.

That is, the two-component polyurethane composition of Korean Patent No. 10-0506142, which is a conventional technology for urethane rubber-based coating waterproofing materials, adds an active hydrogen compound that reacts with an isocyanate compound during polyurethane curing as acrylic polyol instead of polyether and amine compounds. , by adding an O-ether-based moisture absorbent, it is possible to improve the discoloration and weather resistance of the cured coating film and suppress foaming of the coating film, but it has the disadvantage of having a very slow curing speed, and in addition, the self-smoothing and environmental stability of Korean Patent No. 10-0487065 The two-component polyurethane waterproofing material composition, which has excellent compatibility and workability, does not contain tar among the raw materials, so it is environmentally friendly and has self-smoothing properties, so it has good workability, but has a slow curing speed and has complicated vertical surfaces and shapes due to self-smoothing properties. In building structures, there was a problem of the coating film flowing off before curing. The fifth prior art can be applied to structures with complex shapes by increasing the speed of curing of waterproofing materials, and is cured at room temperature, eliminating the need for heating, and is a spray method. This is a technology that provides a coating waterproofing composition capable of waterproofing a wide range of applications and a coating method using the composition.

The polyurethane coating film waterproofing material composition of the fifth prior art is an isocyanate prepolymer consisting of 35 to 55 wt% of aromatic diisocyanate, 35 to 55 wt% of polyoxyalkylene glycol, and 3 to 15 wt% of plasticizer; and polyol 65 to 85 wt consisting of at least one of polyoxypropylene glycol with a functional group of 2 to 3, a molecular weight of 200 to 5,000, and a hydroxyl group of 20 to 300, and polyoxypropylene triol with a functional group of 3, a molecular weight of 400 to 5,000, and a hydroxyl group of 40 to 700. %, and a curing agent mixture containing 15 to 30 wt% of a chain extender consisting of at least one of polyester polyol and amine chain extender, and the volume ratio of the main:curing agent mixture is 1:0.9 to 1:1.1.

In addition, the coating method of the fifth prior art includes a base coat layer forming step, a middle coat layer forming step, and a top coat layer forming step.

First, the sublayer formation stage. As a step of forming an undercoat layer formed on the surface of a waterproof part of a building, if the base is concrete, a low-viscosity two-component epoxy undercoat layer or a one-component urethane undercoat layer can be formed, and the undercoat layer has a thickness of one coat. It is desirable to set it to about 50㎛.

Next, the intermediate layer forming step can be performed, for example, by mixing and spraying in a static mixer using a two-component sprayer, or by collision mixing, and the method of mixing and spraying in a static mixer using a two-component sprayer is: In a two-component sprayer, the base material and hardener can be painted by moving through different paths and mixing and spraying them through a static mixer installed at the end of the paint gun.

At this time, the mixing ratio of the base material and the hardener is preferably in the range of 1:0.9 to 1.1 by volume, and the base material and hardener are allowed to flow through the hose of the equipment dedicated to polyurethane coating waterproofing materials through a transfer pump and into the paint gun. By mixing at low pressure through a static mixer installed at the end, the mixed base material and hardener are sprayed onto the undercoat layer. It is preferable that the thickness of one coat of the middle layer is 400-600㎛.

Lastly, the top coat layer forming step is performed by forming a polyurethane coating layer with excellent weather resistance on the formed middle layer. The top coat layer can be formed using a brush, roller, spray, etc., and the film thickness is 50%. It is desirable to make it more than ㎛.

The polyurethane coating waterproofing composition of the fifth prior art not only has a fast reaction rate by introducing a chain extender and a catalyst into the curing agent included in the coating waterproofing composition, but can be cured at room temperature, so it is applied to structures of complex shapes. It is advantageous for the following, waterproofing can be done over a wide area using the spray method, and since it does not contain solvents, it has the effect of not generating bad odors during construction.

However, when applying a polyurethane waterproofing agent using a spray method, a thickness of 2 mm or more is required because the tensile strength is low due to the characteristics of polyurethane itself and it is vulnerable to continuous expansion and contraction. At a thickness of more than 2 mm, the curing speed is significantly slow, making it difficult to use, especially in winter. Of course, this is almost a difficult situation, and even if this problem is solved to some extent with chain extenders and catalysts, the thickness must still be limited to a few mm and, of course, the waterproof performance is lower than that of polyurea coating films.

In particular, when foaming a polyurethane coating film to a thickness of about 1 cm, it takes more than 1 day to dry even in the summer, and at least 5 days or almost 7 days in winter when the temperature is below -10 degrees, so it is virtually impossible to work in the winter. And, even in the summer, if it suddenly rains after roof waterproofing, serious defects may occur. Even when foaming a polyurethane coating film with a spray gun, there are parts that are more than 1cm thick, and there are times when these parts do not dry reliably even in the summer.

Registered Patent No. 10-0956489 (Polyurea waterproof coating method for concrete structures) Registration Patent No. 10-1310615 (Polyurethane coating waterproofing composition and spray-type coating method using the composition)

The present invention is intended to solve the above problems, and its purpose is to provide a novel urethane intermediate composition used in primer layer work for polyurea rooftop waterproofing, which significantly shortens the curing time and allows the work to be done by spraying. The purpose is to provide a urethane intermediate composition for polyurea rooftop waterproofing and a polyurea rooftop waterproofing construction method using the same.

The urethane intermediate composition for polyurea rooftop waterproofing according to an aspect of the present invention for achieving the above object includes, as the main ingredient (10), 140 to 165 parts by weight of a first polyether polyol having a divalent hydroxy functional group number average molecular weight of 2000. and 22 to 35 parts by weight of a second polyether polyol having a divalent hydroxy functional group number average molecular weight of 3000 and 8 to 20 parts by weight of a third polyether polyol having a trivalent hydroxy functional group number average molecular weight 4000; 30 to 45 parts by weight of crosslinking agent; 60 to 75 parts by weight of an extender pigment containing calcium carbonate (CaCO ₃ ); 15 to 25 parts by weight of antifoaming agent; and 14 to 24 parts by weight of color pigment paste; The base material (10) is mixed, and as a curing agent (20), 70 to 85 parts by weight of the fifth polyether polyol having a divalent hydroxy functional group number average molecular weight of 1000 and the sixth polyether polyol having a divalent hydroxy functional group number average molecular weight of 2000. 5 to 15 parts by weight of polyether polyol and 60 to 75 parts by weight of a seventh polyether polyol having a trivalent hydroxy functional group number average molecular weight of 4000; Among diisocyanates, 27 to 40 parts by weight of TDI (Toluene Di Isocyanate) and 5 to 18 parts by weight of Monomeric MDI (Methylene diphenyl diisocyanate); 10 to 23 parts by weight of exemption solvent; and 1 to 10 parts by weight of a viscosity modifier that doubles as a plasticizer; The hardener (20) is mixed by mixing, and the base material (10) and the hardener (20) are mixed at a weight ratio of 0.7 to 1.5:1.

Preferably, the first polyether polyol used in the main body 10 is 150 to 155 parts by weight, the second polyether polyol is 27 to 30 parts by weight, and the third polyether polyol is 12 to 155 parts by weight. 15 parts by weight, the cross-linking agent is 36 to 38 parts by weight, the extender is 65 to 68 parts by weight, the antifoaming agent is 18 to 20 parts by weight, the color pigment paste is 17 to 19 parts by weight, and the curing agent is 15 to 15 parts by weight. As used in (20), the fifth polyether polyol is 76 to 80 parts by weight, the sixth polyether polyol is 7 to 9 parts by weight, the seventh polyether polyol is 65 to 70 parts by weight, and Among the diisocyanates, the TDI (Toluene Di Isocyanate) is 32 to 35 parts by weight, the Monomeric MDI is 10 to 13 parts by weight, the exemption solvent is 15 to 18 parts by weight, and the plasticizer and viscosity regulator is 2 to 5 parts by weight. It is characterized by

Also preferably, the main agent (10) includes 5 to 7 parts by weight of 1,4 BGD (1,4 Butylene Glycol), which is used as a bifunctional crosslinking agent as the fourth polyether polyol, and a polyol with a trifunctional number average molecular weight of 420. 0.3 to 4 parts by weight are added, and 3 to 5 parts by weight of polyol with a bifunctional number average molecular weight of 90 and 3 to 5 parts by weight of Modified MDI as another diisocyanate are added to the curing agent (20).

More preferably, the base material 10 includes 15 to 17 parts by weight of a nonphthalate-based eco-friendly plasticizer with low viscosity, 5 to 7 parts by weight of a thixotropic additive to provide storage stability, and 4 to 5 parts by weight of Xylene as a solvent. Additionally, 4 to 6 parts by weight of a chain extender that provides rigidity between the polyol and the isocyanate is added, and to the curing agent (20), 4 to 6 parts by weight of Xylene as a solvent and 0.2 to 3 PHOSPHORIC ACID as a first storage stabilizer are added. It is characterized by adding 1 to 3 parts by weight of BENZOYL/CHLORIDE (CP) as a second storage stabilizer.

Also preferably, the base material and the curing agent are mixed at a weight ratio of 0.9 to 1.1:1.

Most preferably, a very small amount of dispersant, a moisture absorbent to prevent foaming, and an additive to provide storage stability are further added to the main ingredient 10.

On the other hand, the polyurea rooftop waterproofing construction method using the urethane intermediate composition for polyurea rooftop waterproofing according to another aspect of the present invention to achieve the above object is (a) the area where the urethane intermediate composition for polyurea rooftop waterproofing is to be applied; A step of selecting a construction site and removing foreign substances from the construction site (S100); (b) After step (a), a step (S200) of mixing primers for urethane undercoating and performing urethane undercoating work as a first primer treatment; (c) after step (b), performing a urethane intermediate coating operation on the urethane intermediate composition by spraying the urethane intermediate coating composition (S300); and (d) after step (c), when the urethane intermediate composition is dried, polyurea waterproofing work is performed (S400); It is characterized by including.

Preferably, (e) performing a urethane topcoat operation after step (d) (S500); Further comprising, the step (b) is a prepolymer made from various hydroxyl group (R-OH) compounds and isocyanate (R-N=C=O) compounds, and the free isocyanate group in the molecule is in the air. It is cured by combining with moisture, and the step (e) is characterized in that it is a step to prevent yellowing caused by ultraviolet rays due to exposure to the curing agent.

The urethane intermediate composition for polyurea rooftop waterproofing according to the present invention is a urethane intermediate composition for polyurea rooftop waterproofing that has a significantly shortened curing time and can be used by spraying, and a polyurea rooftop waterproofing construction method using the same is possible.

In addition to the above object, other objects and advantages of the present invention will become apparent through a detailed description of the embodiment with reference to the attached drawings.

Figure 1 is a coating state diagram for the bottom layer of a concrete structure according to the fourth prior art.
Figure 2 is a diagram showing the raw material mixing process of the urethane intermediate composition for polyurea rooftop waterproofing according to one aspect of the present invention.
Figure 3 is a flow chart of a polyurea rooftop waterproofing construction method using a urethane intermediate composition for polyurea rooftop waterproofing according to another aspect of the present invention.
Figure 4 is a photograph comparing the dry state of the prior art and the polyurea rooftop waterproofing of the present invention in the state of urethane intermediate coating work.
Figure 5 is a photo of the polyurea rooftop waterproofing urethane intermediate composition of the present invention dried after working with a thickness of 1 cm in winter.
Figure 6 is a photo of the urethane intermediate work of the polyurea rooftop waterproofing of the present invention for the flange and bolt area.
Figure 7 is a photo of the urethane intermediate work of the polyurea rooftop waterproofing of the present invention for slopes and corners.
Figure 8 is a front and back photo of the spray foaming machine of the urethane intermediate composition for polyurea rooftop waterproofing of the present invention.

Hereinafter, a preferred embodiment of the urethane intermediate composition for polyurea rooftop waterproofing according to the present invention and the polyurea rooftop waterproofing construction method using the same will be described in detail with reference to FIGS. 2 to 8.

Figure 2 is a diagram showing the raw material mixing process of the urethane intermediate composition for polyurea rooftop waterproofing according to one aspect of the present invention, and Figure 3 is a diagram showing the raw material mixing process of the urethane intermediate composition for polyurea rooftop waterproofing according to another aspect of the present invention. This is a flowchart of the waterproofing construction method.

Figures 4 (a) and (b) are photos of the dry state of the prior art and the urethane intermediate coating of the polyurea rooftop waterproofing of the present invention, respectively, and Figure 5 is a photograph of the urethane intermediate coating of the polyurea rooftop waterproofing of the present invention. This is a photo of the composition dried after application to a thickness of 1 cm in winter, Figure 6 is a photo of the urethane intermediate work of the polyurea rooftop waterproofing of the present invention for the flange and bolt areas, and Figure 7 is a photo of the polyurea rooftop waterproofing of the present invention for the slope and corner areas. This is a photo of urethane intermediate work.

Figures 8 (a) and (b) are front and rear photos of a spray foaming machine for the urethane intermediate composition for polyurea rooftop waterproofing of the present invention, respectively.

In describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description will be omitted. In addition, preferred embodiments of the present invention will be described below, but the technical idea of the present invention is not limited or restricted thereto, and of course, it can be modified and implemented in various ways by those skilled in the art.

(Raw material mixing for urethane intermediate composition for polyurea rooftop waterproofing)

First, as shown in FIG. 1, the urethane intermediate composition (30) for polyurea rooftop waterproofing according to one aspect of the present invention is prepared by mixing in advance the base material (10) and the curing agent (20) for the urethane intermediate composition described in detail later. In this state, just before intermediate construction, the base material (10) and the hardener (20) are mixed at a ratio of 0.7 to 1.5:1, preferably, 0.9 to 1.1:1, and most preferably, 1:1, and the urethane is sprayed. The formulation of base material (10) used in the intermediate composition is as follows.

① Main formulation (liquid B):

170 to 220 parts by weight of polyether polyol (preferably, 140 to 165 parts by weight of a first polyether polyol (for example, SC2204) with an average molecular weight of a divalent hydroxy functional group (number average molecular weight: the same hereinafter) of 2000 and a hydroxy functional group 22 to 35 parts by weight of a second polyether polyol with a divalent average molecular weight of 3000 (e.g. PP-3000) and 8 to 20 parts by weight of a third polyether polyol with a trivalent hydroxy functional group average molecular weight of 4000 (e.g. GP-4000) , more preferably, 150 to 155 parts by weight of the first polyether polyol, 27 to 30 parts by weight of the second polyether polyol and 12 to 15 parts by weight of the third polyether polyol, most preferably, 152 parts by weight of the first polyether polyol. parts by weight and 28 parts by weight of the second polyether polyol and 13 parts by weight of the third polyether polyol); 30 to 45 parts by weight (preferably, 36 to 38 parts by weight, most preferably 37 parts by weight) of a crosslinking agent (e.g., DETDA); 60 to 75 parts by weight, more preferably 65 to 68 parts by weight, most preferably 66 parts by weight of an extender pigment such as calcium carbonate (CaCO ₃ ) (e.g. SHC 300); 15 to 25 parts by weight (preferably 18 to 20 parts by weight, most preferably 19 parts by weight) of an antifoaming agent (e.g. 348SL); and 14 to 24 parts by weight of color pigment paste (preferably, 17 to 19 parts by weight, most preferably, 18 parts by weight); Combine the theme (10) by mixing.

In the above subject, the second and third polyether polyols are polyols commonly used in urethane intermediate formulations, but the first polyether polyol, unlike other polyols, is manufactured through polymerization of EO (Ethylene Oxide), Compared to general polyol, it has a faster curing speed and superior mechanical properties such as tensile strength and tear strength. It is mainly used as a bifunctional crosslinking agent and is a polyol with a low molecular weight. It is used to increase rigidity. If too much is used, the mechanical properties of the coating film itself deteriorate. This can be reduced.

In addition, to the above subject, 5 to 7 parts by weight of 1,4 BGD (1,4 Butylene Glycol), which is mainly used as a bifunctional crosslinking agent as a fourth polyether polyol and is used to increase rigidity with a low molecular weight polyol, can be added. Again, if too much is used, the mechanical properties of the coating film itself may be reduced. In addition, a trifunctional polyol with an average molecular weight of 420 (for example, GY420) may be added in a small amount (0.3 to 4 parts by weight) to provide rigidity to the coating film.

In addition, the cross-linking agent (DETDA: Di Ethyl Toluene Di Amine) is a cross-linking agent used to accelerate the curing of polyurea and strengthen mechanical properties, and is the same as Ethancure 100 and Lonza DETDA 80, and DETDA is a very effective polyurethane elastomer chain. It is an extension system. It is also used as a polyurethane and epoxy resin hardener, antioxidant epoxy resin, industrial oil and lubricant, and as an intermediate in organic synthesis, especially as a spray polyurea chain extender in the case of RIM (reaction injection molding). important in the field.

Additionally, the above subject includes 15 to 17 parts by weight of a nonphthalate-based eco-friendly plasticizer with low viscosity (e.g., N10), 5 to 7 parts by weight of a thixotropic additive to provide storage stability (e.g., E92), and Xylene 4 as a solvent. ~ 5 parts by weight and 4 ~ 6 parts by weight of a chain extender (e.g. Neomine A100) that provides rigidity between the polyol and the isocyanate may be added.

In addition, a very small amount of dispersant (e.g. CFC960) (0.3 to 5 parts by weight) and an anti-foaming moisture absorbent (e.g. SA1720) (0.1 to 1 part by weight) to prevent foaming when moisture reacts with the hardener in summer when humidity is high. parts by weight), an additive to provide storage stability (e.g. HPA420L) (0.3 to 1 part by weight), another antifoaming agent (e.g. BYK054) (1 to 3 parts by weight), and another catalyst (e.g. Neocat) B20) (1 to 3 parts by weight) may be further added.

Meanwhile, the formulation of the hardener (20) to be mixed with the above-mentioned subject is as follows.

② Hardener formulation (liquid A):

Meanwhile, the components and mixing ratio of the hardener (20) mixed and sprayed with the base material (10) are as follows.

135 to 157 parts by weight of polyether polyol (preferably, 70 to 85 parts by weight of a fifth polyether polyol (for example, PP1000) having an average molecular weight of a divalent hydroxy functional group of 1000 and a sixth polyol having an average molecular weight of a divalent hydroxy functional group of 2000 5 to 15 parts by weight of an ether polyol (for example, PP-2000) and 60 to 75 parts by weight of a seventh polyether polyol (for example, GP-4000) having an average molecular weight of 4000 trivalent hydroxy functional groups, more preferably, a fifth polyol. 76 to 80 parts by weight of the ether polyol and 7 to 9 parts by weight of the sixth polyether polyol and 65 to 70 parts by weight of the seventh polyether polyol, most preferably, 78 parts by weight of the fifth polyether polyol and 8 parts by weight of the sixth polyether polyol. parts by weight and 67 parts by weight of the seventh polyether polyol); 32 to 48 parts by weight of diisocyanate (preferably, 27 to 40 parts by weight of relatively soft Toluene Di Isocyanate (TDI) and 5 to 18 parts by weight of Monomeric MDI (Methylene diphenyl diisocyanate) (e.g. COSMONATE PI (MI)), further Preferably, 32 to 35 parts by weight of TDI and 10 to 13 parts by weight of Monomeric MDI, most preferably, 33 parts by weight of TDI and 11 parts by weight of Monomeric MDI); 10 to 23 parts by weight (preferably, 15 to 18 parts by weight, most preferably, 16 parts by weight) of an exemption solvent (e.g., DMC); and 1 to 10 parts by weight (preferably, 2 to 5 parts by weight, most preferably, 4 parts by weight) of a viscosity modifier that doubles as a plasticizer (e.g., TCPP: TriChloroPhosPhate); Mix to form the hardener (20).

In the curing agent, the fifth and seventh polyether polyols are polyols commonly used in urethane intermediate formulations (the seventh polyether polyol can be the same product as the third polyether polyol), or the sixth polyether polyol Polyether polyol is an important polyether polyol that plays a role in creating a polymer by reacting with the isocyanate of MDI and the hydroxyl group of the polyol, lowering the NCO% and increasing the overall molecular structure. Furthermore, 3 to 5 parts by weight of a bifunctional polyol with a molecular weight of 90 (for example, MP-DIOL) may be added to act as a cross-linking agent to provide rigidity when mixed with the base material.

In the above curing agent, among diisocyanates, 'COSMONATE PI(MI)', which is used as Monomeric MDI, has a significantly higher 2,4'-, 2,2'-DipIenylmethane diisocyanate content than 'COSMONATE PH'. It is a product that exists in a liquid state at room temperature and has a linear structure with 2 functional groups. 'COSMONATE PI' has a higher content of 2,4'-, 2,2'-DipIenylmethane diisocyanate than 'COSMONATE PH', so the reaction is mild. Because it is easy to control speed, it is widely used as a raw material for the manufacture of industrial products, household goods, and sporting goods such as coatings, paints, flooring materials, and adhesives. Furthermore, 3 to 5 parts by weight of Modified MDI (for example, COSMONATE LL (=mm103C)) can be added as diisocyanate, which carbodiimides a portion of Cosmonate PH, which is a crystalline solid at room temperature. 'Cosmonate LL', a modified MDI invar with a transparent and light yellow color developed for ease of handling and use by maintaining a low viscosity liquid state at room temperature, is an imide bond in which part of the product's bonding structure is harder than urethane bond. Because it is durable, resistant to hydrolysis, and has excellent mechanical strength, it is added in small amounts to improve physical properties. It is also effective in improving the compatibility of Free NCO Group and Polyol when manufacturing prepolymers, so it can be used at low temperatures in the final product. It is also used for the purpose of improving stability.

Additionally, the curing agent includes 4 to 6 parts by weight of Additional weight parts may be added.

In addition, a very small amount of Bismuth metal catalyst (e.g. BINL A9), moisture absorbent (e.g. Incozol 2), color pigment PASTE and/or a rheology regulator (e.g. Silica M5) are added to ensure storage stability of the color pigment contained in PASTE. It can be.

(Polyurea rooftop waterproofing construction method using urethane intermediate composition for polyurea rooftop waterproofing)

Now, a polyurea rooftop waterproofing construction method using a urethane intermediate composition for polyurea rooftop waterproofing according to another aspect of the present invention will be described in detail with reference to FIG. 3.

① First, survey the work area, such as the area and shape of the area where the polyurea rooftop waterproof paint according to the present invention is to be applied, select the area for construction, and then remove foreign substances from the area to be applied to improve adhesion. Completely remove floating matter, oil, moisture, dirt, dust, coating film, and other foreign substances (S100), but if necessary, use a planer, grinder, blasting, chipping, or diamond wheel grinder to remove surface contaminants. Remove the surface to create a clean surface, and if there are any raised or damaged parts, they must be completely removed using a sandblaster, diamond wheel, wire brush, etc. In addition, cracks and dents must be filled with grouting and putty, and wet surfaces must be completely dried. In other words, the previously used floor must be cleaned of any contaminated oil, grease, or any mold release agent that interferes with adhesion using a dedicated cleaner, and then cleaned during the primer and topcoat work, and the surface to be coated must be thoroughly dried. do. The construction surface is cleaned using vacuum shot blasting, grit blasting, drum sander, ultra-high pressure water basting, etc. to remove cement laitance and weak surface layer. Broken concrete on the construction surface must be removed, and cracks, voids, and dents must be filled with appropriate repair materials. If the construction surface is humid, it is recommended to dry it using a heat gun, etc.

② After the floor foreign matter removal step (S100), that is, after the background treatment is completed and surface dust is completely removed using a dust collector, urethane undercoat work is performed as a primer mixture and primary primer treatment for the urethane undercoat (S200).

At this time, the primer for urethane undercoating is a prepolymer made from various polyol (R-OH) compounds and isocyanate (R-N=C=O) compounds, and the free isocyanate group in the molecule combines with moisture in the air to harden. It is done in a way that works.

More specifically, for example, P1000 (polyol with two functional groups with a molecular weight of 1000), GP4000 (polyol with three functional groups with a molecular weight of 4000), TMP (TriMethylol Propane) (used for hardness and quick drying of urethane primers), and TDI (Toluene Di Isocyanate). (Reaction with moisture in the air is faster than other isocyanates), Xylene, MEk, Toluene, DMC (used to lower the viscosity of solvents and primers) and DBTDL (metal catalyst, used to create a fast polymer reaction when synthesizing TDI and polyol) It is made by mixing an appropriate amount of catalyst).

③ After the urethane primer work step (S200), the urethane middle coat work (S300), which is the core of the present invention, is performed.

In particular, if the intermediate work of this step is not done well, subsequent polyurea adhesion will not work well, so it is the most important step in the polyurea rooftop waterproofing construction method of the present invention and is also the work that requires the most labor costs.

To summarize again, 200 liters (220 kg) of the hardener (20), which is liquid A, and 200 liters (220 kg) of the main liquid (10), which is liquid B, are foamed using the spray foaming machine shown in FIG. 8 so that A:B = 1:1. (See Figures 6 and 7).

In particular, among the polyurea rooftop waterproofing construction methods of the present invention, the urethane primer work (S200) can be foamed by machine, and the urethane primer for rooftop waterproofing of the present invention is a chemically manufactured product that can be foamed by machine. The generation rate is close to zero, and since the foam is fired by machine, it has the advantage of being able to construct (foam) an area of 4,000 m ² with 3 people per day. On the other hand, other companies' products cannot be foamed by machine, and people have to install them individually with brushes or rollers. Therefore, in order to construct a rooftop with an area of 4,000 m ² , 15 to 20 people were needed to complete the construction in one day. The reason why three people are needed in the construction method of the present invention is to take into account the number of people who must hold the hose in the middle, as shown in Figure 7. In other cases, it is of course possible to use one or two people.

Additionally, in the case of the present invention, since the urethane intermediate coat is foamed using a spray foaming machine, as shown in FIG. 6, the urethane intermediate coat of the polyurea rooftop waterproofing of the present invention can be efficiently performed on the flange and bolt parts. , As shown in Figure 7, urethane intermediate work of polyurea rooftop waterproofing of the present invention can be performed efficiently even on slopes and corners.

Moreover, according to the urethane intermediate construction method of the present invention, the curing time is significantly shortened. When foamed to a thickness of about 1 cm, for the product of the present invention, a drying time of 30 minutes to 1 hour is sufficient in the summer, and in the winter, the drying time is sufficient. Even if the temperature is above -14 degrees, drying is completed within 24 hours (1 day). On the other hand, other companies' products did not dry reliably when applied to a thickness of more than 1cm even in the middle of summer, and the curing time (drying time) of other companies' general urethane intermediate roof waterproofing products required 1 day of drying time in the summer, and -10% in the winter. Because it required more than 5 days of drying time (it took almost 7 days), work was virtually impossible in winter.

Incidentally, due to the shortening of the curing time, if the urethane intermediate coating takes about 7 days in the middle of winter to dry as in the prior art, defects will occur if it rains or snows after the rooftop waterproofing intermediate coating (see Figure 4 (a)). ), the product of the present invention not only did not cause such defects, but was also able to be dried for one day at -14 degrees Celsius even in the middle of winter. As shown by the red arrow in Figure 5, even in the case of a urethane coat of sufficient thickness (about 1 cm) in the middle of winter, when the accumulated snow was removed, it was confirmed that sufficient swelling did not occur and the good urethane coat was dried.

For reference, more than 80% waterproofing could be achieved with the urethane intermediate coating alone in the S300 step of the present invention, and when the next step polyurea waterproofing process is added, the thickness of the urethane intermediate waterproofing layer of the present invention is only 2 mm, making it 100% waterproof. was possible.

Meanwhile, in the case of tensile strength, it was confirmed that the tensile strength of general urethane medium was 3 N/㎟, whereas the product developed according to the present invention had an excellent tensile strength of about 10 N/㎟.

Incidentally, the conventional polyurethane intermediate spray foaming machine requires the use of a special gun and is complicated to use, so it can only be used by skilled technicians. However, in the case of the polyurethane intermediate spray foaming machine of the present invention, the isocyanate curing time in the curing agent is It is possible to delay spray foaming, and spray foaming can be done with an airless gun, so only one supply hose is required, so a special gun is not required, and the method of use is simple and easy to handle. The power of the polyurethane intermediate spray foaming machine of the present invention is also capable of spraying with a power of 2 horsepower, and since only the transfer pump is needed, 2.5 horsepower is sufficient, so there is no need for a separate generator at the construction site, and it is economical. .

④ Subsequently, after the urethane intermediate work step (S300), the polyurea waterproofing work (S400) of the present invention is performed. Since this process may be carried out in accordance with conventional polyurea waterproofing work, detailed description is omitted.

⑤ Finally, after the polyurea waterproofing work (S400), the urethane topcoat work step (S500) is performed.

The urethane top coating step (S500) is not a functionally essential step, but is to prevent yellowing caused by ultraviolet rays due to exposure to a hardener (using HDI Trimer, aliphatic isocyanate). In the case of rooftop waterproofing exposed to ultraviolet rays, It is desirable to implement it as much as possible.

The urethane topcoat is made by mixing, as a base material, polyester-modified acrylic polyol, polyester polyol, and acrylic polyol (used to obtain weather resistance and excellent gloss for reaction with the hardener HDI Trime), and adding an appropriate amount of colored pigment. It is also used for concealment and coloring.

⑥ After the urethane top coating step (S500), it is shipped after going through the drying and curing step (S600) and quality confirmation.

Example 1

First, 152 parts by weight of a first polyether polyol (SC2204) having an average molecular weight of 2000 divalent hydroxy functional groups, 28 parts by weight of a second polyether polyol (PP-3000) having an average molecular weight of 3000 divalent hydroxy functional groups, and 3 hydroxy functional groups. 13 parts by weight of a third polyether polyol (GP-4000) having an average molecular weight of 4000; 37 parts by weight of cross-linking agent (DETDA); 66 parts by weight of calcium carbonate (CaCO ₃ ) (SHC 300) as an extender pigment; 19 parts by weight of antifoam (348SL); Color pigment paste 18 parts by weight); Combine the theme (10) by mixing.

The average of 78 parts by weight of the fifth polyether polyol (PP1000) having an average molecular weight of divalent hydroxy functional groups (PP1000) and 8 parts by weight of the sixth polyether polyol (PP-2000) having an average molecular weight of divalent hydroxy functional groups (PP-2000) and trivalent hydroxy functional groups 67 parts by weight of a seventh polyether polyol (GP-4000) having a molecular weight of 4000; As diisocyanate, 33 parts by weight of TDI (Toluene Di Isocyanate) and 11 parts by weight of Monomeric MDI (Methylene diphenyl diisocyanate) (COSMONATE PI(MI)); Exemption solvent (DMC) 16 parts by weight); and a viscosity modifier that doubles as a plasticizer (TCPP: TriChloroPhosPhate) 4 parts by weight); Mix to form the hardener (20).

Polyurethane intermediate treatment is performed using a spray foaming machine while mixing the base material (10) and the hardener (20) at a ratio of 1:1.

Example 2

In the subject matter of Example 1, 6 parts by weight of 1,4 BGD (1,4 Butylene Glycol) as the fourth polyether polyol; 1 part by weight of polyol (GY420); was further added,

To the curing agent of Example 1, 4 parts by weight of polyol (MP-DIOL) having a bifunctional molecular weight of 90; 4 parts by weight of Modified MDI (COSMONATE LL(=mm103C)) as diisocyanate; The only difference is that is added, and it is the same as the first embodiment.

Example 3

In the subject matter of Example 1, 6 parts by weight of 1,4 BGD (1,4 Butylene Glycol) as the fourth polyether polyol; 1 part by weight of polyol (GY420); 16 parts by weight of plasticizer (N10); 6 parts by weight of thixotropic additive (E92); 4.5 parts by weight of Xylene as a solvent; Chain extender (Neomine A100) 5 parts by weight; was further added,

To the curing agent of Example 1, 4 parts by weight of polyol (MP-DIOL) having a bifunctional molecular weight of 90; 4 parts by weight of Modified MDI (COSMONATE LL(=mm103C)) as diisocyanate; 5 parts by weight of Xylene as a solvent; 1 part by weight of the first storage stabilizer (PHOSPHORIC ACID) and 2 parts by weight of the second storage stabilizer (BENZOYL/CHLORIDE (CP)); The only difference is that is added, and it is the same as the first embodiment.

Example 4

In the subject matter of Example 1, 6 parts by weight of 1,4 BGD (1,4 Butylene Glycol) as the fourth polyether polyol; 1 part by weight of polyol (GY420); 16 parts by weight of plasticizer (N10); 6 parts by weight of thixotropic additive (E92); 4.5 parts by weight of Xylene as a solvent; Chain extender (Neomine A100) 5 parts by weight; 1 part by weight of dispersant (CFC960); 0.5 parts by weight of moisture absorbent to prevent foaming (SA1720); 0.5 parts by weight of additive to provide storage stability (HPA420L); another antifoaming agent (BYK054) 2 parts by weight); and another catalyst (Neocat B20) 2 parts by weight); was further added,

To the curing agent of Example 1, 4 parts by weight of polyol (MP-DIOL) having a bifunctional molecular weight of 90; 4 parts by weight of Modified MDI (COSMONATE LL(=mm103C)) as diisocyanate; 5 parts by weight of Xylene as a solvent; 1 part by weight of the first storage stabilizer (PHOSPHORIC ACID) and 2 parts by weight of the second storage stabilizer (BENZOYL/CHLORIDE (CP)); The only difference is that is added, and it is the same as the first embodiment.

In summary, the polyurea rooftop waterproofing construction method using the urethane intermediate composition for polyurea rooftop waterproofing according to the present invention has the following advantages.

1) The curing time is significantly shortened, so when foaming to a thickness of about 1 cm, drying time is sufficient in the summer of 1 hour, and even in the winter, if the temperature is above -14 degrees, drying is completed within 24 hours (1 day).

2) Due to the shortened curing time, work is possible even in the middle of winter when the temperature is -14 degrees.

3) Since foaming is done using a spray foaming machine, it is possible to construct (foam) an area of 4,000m ² with 3 people per day.

4) Since the urethane intermediate coating is foamed using a spray foaming machine, urethane intermediate coating work can be performed efficiently even on curved, uneven or inclined areas.

5) The generation of bubbles is close to zero, and there is almost no swelling even in a humid environment.

6) More than 80% waterproofing was achieved with the urethane coating itself, and when the polyurea waterproofing process was added, 100% waterproofing was possible with only 2mm of the urethane coating waterproofing layer.

7) The tensile strength was excellent at about 10 N/㎟.

8) The conventional polyurethane intermediate spray foaming machine requires the use of a special gun and is complicated to use, so it can only be used by skilled technicians. However, the polyurethane intermediate spray foaming machine of the present invention can be foamed with an airless gun, so the supply hose is required. Since you only need one, there is no need for a special gun, and the method of use is simple, making it easy to handle.

9) The polyurethane intermediate spray foaming machine of the present invention can spray with a power of 2 horsepower, and since only the transfer pump is needed, 2.5 horsepower is sufficient, so a separate generator is not needed and is economical.

Although the present invention has been described above according to an embodiment of the present invention, changes and modifications made by those skilled in the art without departing from the technical spirit of the present invention do not fall within the scope of the present invention. Of course.

10: Urethane neutral topic
20: Urethane intermediate hardener
30: Urethane intermediate composition

Claims (8)

As a urethane intermediate composition for polyurea rooftop waterproofing,
As the subject matter (10), 140 to 165 parts by weight of a first polyether polyol having a divalent hydroxy functional group number average molecular weight of 2000 and 22 to 35 parts by weight of a second polyether polyol having a divalent hydroxy functional group number average molecular weight 3000 and hydroxy 8 to 20 parts by weight of a third polyether polyol having a trivalent functional group number average molecular weight of 4000; 30 to 45 parts by weight of crosslinking agent; 60 to 75 parts by weight of an extender pigment containing calcium carbonate (CaCO ₃ ); 15 to 25 parts by weight of antifoaming agent; and 14 to 24 parts by weight of color pigment paste; Combine the theme (10) by mixing,
As a curing agent (20), 70 to 85 parts by weight of a fifth polyether polyol having a divalent hydroxy functional group number average molecular weight of 1000, 5 to 15 parts by weight of a sixth polyether polyol having a divalent hydroxy functional group number average molecular weight 2000, and hydroxy 60 to 75 parts by weight of a seventh polyether polyol having a trivalent functional group number average molecular weight of 4000; Among diisocyanates, 27 to 40 parts by weight of TDI (Toluene Di Isocyanate) and 5 to 18 parts by weight of Monomeric MDI (Methylene diphenyl diisocyanate); 10 to 23 parts by weight of exemption solvent; and 1 to 10 parts by weight of a viscosity modifier that doubles as a plasticizer; Mix the hardener (20),
A urethane intermediate composition for polyurea rooftop waterproofing, characterized in that it is made by mixing the base material (10) and the curing agent (20) at a weight ratio of 0.7 to 1.5:1. According to claim 1,
Used in the main body (10), the first polyether polyol is 150 to 155 parts by weight, the second polyether polyol is 27 to 30 parts by weight, and the third polyether polyol is 12 to 15 parts by weight. , the crosslinking agent is 36 to 38 parts by weight, the extender pigment is 65 to 68 parts by weight, the defoaming agent is 18 to 20 parts by weight, and the color pigment paste is 17 to 19 parts by weight,
The fifth polyether polyol used in the curing agent 20 is 76 to 80 parts by weight, the sixth polyether polyol is 7 to 9 parts by weight, and the seventh polyether polyol is 65 to 70 parts by weight. , of the diisocyanate, the TDI (Toluene Di Isocyanate) is 32 to 35 parts by weight, the Monomeric MDI is 10 to 13 parts by weight, the exemption solvent is 15 to 18 parts by weight, and the plasticizer and viscosity regulator is 2 to 5 parts by weight. A urethane intermediate composition for polyurea rooftop waterproofing, characterized in that it is a weight part. According to claim 1,
In the main subject (10), 5 to 7 parts by weight of 1,4 BGD (1,4 Butylene Glycol), which is used as a bifunctional crosslinking agent as the fourth polyether polyol, and 0.3 to 4 parts by weight of a trifunctional polyol with a number average molecular weight of 420. is added,
A urethane intermediate composition for polyurea rooftop waterproofing, characterized in that 3 to 5 parts by weight of a polyol with a bifunctional number average molecular weight of 90 and 3 to 5 parts by weight of Modified MDI as another diisocyanate are added to the curing agent (20). According to claim 3,
In the above subject (10), 15 to 17 parts by weight of a nonphthalate-based eco-friendly plasticizer with low viscosity, 5 to 7 parts by weight of a thixotropic additive to provide storage stability, 4 to 5 parts by weight of Xylene as a solvent, polyol and isocyanate. An additional 4 to 6 parts by weight of chain extender is added to provide rigidity between the chains.
To the curing agent 20, 4 to 6 parts by weight of Xylene as a solvent, 0.2 to 3 parts by weight of PHOSPHORIC ACID as a first storage stabilizer, and 1 to 3 parts by weight of BENZOYL/CHLORIDE (CP) as a second storage stabilizer are further added A urethane intermediate composition for polyurea rooftop waterproofing, characterized in that: According to claim 1,
A urethane intermediate composition for polyurea rooftop waterproofing, characterized in that it is made by mixing the above base material and the curing agent at a weight ratio of 0.9 to 1.1: 1. delete A polyurea rooftop waterproofing construction method using the urethane intermediate composition for polyurea rooftop waterproofing according to any one of claims 1 to 5,
(a) selecting a construction site where the urethane intermediate composition for polyurea rooftop waterproofing is to be applied and removing foreign substances from the construction site (S100);
(b) After step (a), a step (S200) of mixing primers for urethane undercoating and performing urethane undercoating work as a first primer treatment;
(c) after step (b), performing a urethane intermediate coating process using the urethane intermediate composition of any one of claims 1 to 5 by spraying (S300); and
(d) after step (c), when the urethane intermediate composition is dried, polyurea waterproofing work is performed (S400);
A polyurea rooftop waterproofing construction method using a urethane intermediate composition for polyurea rooftop waterproofing, comprising: According to claim 7,
(e) after step (d), performing a urethane topcoat operation (S500);
Including more,
The step (b) is a prepolymer made from various hydroxyl compounds and isocyanate compounds, and is achieved by curing the free isocyanate group in the molecule by combining with moisture in the air,
The step (e) is a polyurea rooftop waterproofing construction method using a urethane intermediate composition for polyurea rooftop waterproofing, characterized in that it is a step to prevent yellowing due to ultraviolet rays due to exposure to a curing agent.