KR102291664B1 - Polyurea-based sheet for waterproofing and waterproofing construction method using the same - Google Patents

Abstract

The present invention relates to a polyurea-based sheet and a waterproofing and anticorrosive construction method using the same and, more particularly, to a polyurea-based sheet for waterproofing and anticorrosion which is formed by curing a combination of a main ingredient and a curing agent. The main ingredient includes 35 to 55 parts by weight of a polyamine mixture, 20 to 30 parts by weight of a crosslinking agent, 7 to 12 parts by weight of an inorganic filler, 5 to 10 parts by weight of glass milled fibers, 5 to 10 parts by weight of a metallic ceramic pigment, and 6 to 9 parts by weight of additives. The curing agent is obtained by reacting 60 to 80 parts by weight of an isocyanate mixture and 20 to 40 parts by weight of epoxidized hydroxyl-terminated polybutadiene (EHTPB) at 60 to 100℃ for two to three hours.

Description

Polyurea-based sheet for waterproofing and anticorrosion and waterproofing and anticorrosive construction method using the same {Polyurea-based sheet for waterproofing and waterproofing construction method using the same}

The present invention relates to a waterproof/corrosive polyurea-based sheet and a waterproof/corrosive construction method using the same.

Polyurea is a high molecular compound having urea bonds of a repeating ethylene structure in its molecular structure, and is synthesized with diamines having a chain extension and low molecular weight to form a urea unit. Therefore, polyurea not only has excellent water resistance and chemical resistance, but also has superior abrasion resistance, heat resistance and stability than polyurethane, which is an additional carbon (C) and nitrogen atom (N ) due to the combination of Such polyurea is widely changed in its properties depending on various factors such as the selected material, molecular weight, and reaction ratio.

In addition, polyurea has excellent compressive strength, excellent acid resistance and alkali resistance, well tolerates UV rays, and has low temperature dependence, so that it can be constructed even in winter. In particular, polyurea has advantages in that it is easy to construct because it uses dedicated equipment, has excellent economic efficiency by shortening the construction period due to rapid curing, and can secure a waterproof/corrosive layer of a certain thickness. In other words, polyurea is a technology that mixes and sprays a polymer material with excellent chemical resistance in a high-pressure collision method.

but like this The spray-type construction using dedicated equipment often results in excessive construction compared to the design dimensions, wastes expensive materials, and increases the construction cost due to manpower to operate the equipment. In addition, there are many polluting factors due to the dust generated during the spray-type construction on site, and the dust leads to material loss, which is also the cause of the increase in the amount of material used.

On the other hand, waterproof sheets that are generally constructed include synthetic rubber-based, asphalt-based, and the like. When using the sheet waterproofing method, a primer is applied and the waterproofing sheet is adhered to the construction, but if air is contained in the lower part of the waterproofing sheet (pinhole phenomenon), it swells according to the temperature change and lifts the waterproofing sheet, which may eventually cause deterioration of the waterproofing layer.

When polyurea is sprayed, the temperature of polyurea is usually around 70°C. The concrete substrate has voids in the concrete itself, and the voids contain air. When polyurea at 70°C is applied, the bubbles contained in the concrete expand and inflate the polyurea coating layer, and in places where the coating layer is weak, it is easy to rupture due to bubbles (pinhole phenomenon). To prevent the pinhole phenomenon, it is necessary to thoroughly treat the concrete face, but it is not perfect, so a fundamental solution is needed.

Accordingly, the present inventors focused on the above technical requirements, and prepared glass milled fibers and inorganic fillers so that they can be manufactured in a sheet type while providing excellent mechanical properties, chemical resistance, heat resistance, and durability to a polyurea waterproof composition with excellent physical properties. A polyurea-based sheet capable of exhibiting excellent ductility, heat resistance, and adhesion by mixing and including epoxidized hydroxy-terminated polybutadiene in the curing component was developed and completed the present invention.

KR publication 2001-0061028

The present invention makes it a technical solution to provide a polyurea-based sheet for waterproofing and anticorrosion.

In addition, the present invention makes it another technical solution to provide a waterproofing/anticorrosive construction method using the waterproof/corrosive polyurea-based sheet.

The present invention in order to solve the above technical problem,

35 to 55 parts by weight of a polyamine mixture, 20 to 30 parts by weight of a crosslinking agent, 7 to 12 parts by weight of an inorganic filler, 5 to 10 parts by weight of glass milled fiber, 5 to 10 parts by weight of a metallic ceramic pigment, and 6 to 9 additives by weight a subject comprising parts by weight;

60 to 80 parts by weight of the isocyanate mixture, 20 to 40 parts by weight of Epoxidized Hydroxyl-Terminated Polybutadiene (EHTPB) at 60 to 100° C. for 2 to 3 hours. It provides a polyurea-based sheet for waterproofing and anticorrosion, characterized in that.

Preferably in the present invention, the epoxidized hydroxyl terminated polybutadiene is characterized in that it has the following formula:

<Formula 1>

In addition, in the present invention, the polyamine mixture is characterized in that by mixing 30 to 40 parts by weight of polyoxypropylene diamine and 5 to 15 parts by weight of polyoxypropylene triamine, the weight average molecular weight is 200 to 5000.

In addition, in the present invention, the crosslinking agent is characterized in that it comprises 10 to 15 parts by weight of an aromatic diamine and 10 to 15 parts by weight of an aliphatic diamine.

In addition, the present invention in order to solve the other technical problem, a pretreatment step of removing foreign substances from the base surface; coating a primer on the pretreated substrate; and forming a waterproof/corrosive layer by installing the waterproof/corrosive polyurea-based sheet according to the above-described surface on the primer coating surface; construction method is provided.

In addition, in the present invention, the primer comprises 30 to 50 parts by weight of an oil-modified bio-polyol, 15 to 30 parts by weight of an isocyanate compound, 5 to 10 parts by weight of a moisture remover, and 15 to 30 parts by weight of a viscosity modifier.

The waterproof/corrosive polyurea-based sheet of the present invention as described above has excellent resistance to action such as load, vibration, shear, and cracks on the underside, and excellent workability by forming a waterproof/corrosive layer in the form of a sheet, It has the effect of excellent economic efficiency by shortening the construction period.

In addition, according to the construction method using the waterproof/corrosive polyurea-based sheet according to the present invention, the construction period is short due to the rapid installation of the polyurea-based sheet on the desired construction site at the construction site, and a waterproof/corrosive layer of a certain thickness is secured This has the effect of forming a waterproof and anticorrosive layer with excellent protective effect on the substrate.

In addition, in areas that need reinforcement due to deterioration or deterioration of various structures, if necessary, they are fixed with fixing pins using a fixing tool to prevent lifting and sagging of the waterproof/corrosive layer, resulting in long-term durability of the structure. It has the effect of enabling performance.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments allow the disclosure of the present invention to be complete, and those of ordinary skill in the art to which the present invention pertains. It is provided to fully inform the person of the scope of the invention. And the terminology used in this specification is for describing the embodiments, and is not intended to limit the present invention. As used herein, the singular also includes the plural, unless the phrase specifically states otherwise.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. On the other hand, the illustration and detailed description of the configuration and the action and effect thereof, which can be easily known from those of ordinary skill in the art, will be simplified or omitted, and the parts related to the present invention will be described in detail.

The waterproof/anticorrosive polyurea-based sheet according to the present invention is a sheet formed by mixing and curing a main agent and a curing agent, wherein the main agent is 35 to 55 parts by weight of a polyamine mixture, 20 to 30 parts by weight of a crosslinking agent, and 7 to 12 parts by weight of an inorganic filler. part, 5 to 10 parts by weight of glass milled fiber, 5 to 10 parts by weight of a metallic ceramic pigment, and 6 to 9 parts by weight of an additive, wherein the curing agent is an isocyanate mixture 60 to 80 parts by weight, epoxidized hydroxyl end It is obtained by reacting 20 to 40 parts by weight of polybutadiene (Epoxidized Hydroxyl-Terminated Polybutadiene, EHTPB) at 60 to 100° C. for 2 to 3 hours. In this case, the sheet may be formed by mixing and curing the main agent and the curing agent by a method known in the art. Hereinafter, the subject and curing agent according to the present invention will be described in detail.

First, the polyamine mixture of the above subject gives excellent mechanical properties such as elongation, impact resistance, crack resistance, and abrasion resistance for forming a flexible waterproof/corrosive layer, and the polyamine mixture of the present invention contains 30 to 40 weight of polyoxypropylene diamine It is characterized in that it is formed by mixing 5 to 15 parts by weight of polyoxypropylene triamine. For example, as the polyamine mixture in the present invention, Huntsman's Jeffamine series (Jeffamine T-5000, Jeffamine D-2000, Jeffamine D-230, Jeffamine D-400, Jeffamine T-403) may be used.

The content of the polyamine mixture is preferably 35 to 55 parts by weight. When the content is less than 35 parts by weight, the effect on physical properties such as flexibility and impact resistance of the polyurea-based sheet is insignificant, and when it exceeds 55 parts by weight, relatively different compositions There is a disadvantage in that it is difficult to make a polyurea-based sheet having desired physical properties because the content of the polyurea is reduced. In addition, it is preferable that the weight average molecular weight of the polyamine mixture is 200 to 5000.

In addition, the crosslinking agent affects the curing time and increases the degree of crosslinking to improve durability such as tensile strength, tear strength, and abrasion resistance while improving reaction speed and improving weather resistance. In the present invention, the crosslinking agent may be an aromatic or aliphatic amine compound used as a chain extender. Preferably, it consists of 10-15 weight part of aromatic diamines and 10-15 weight part of aliphatic diamines. For example, in the present invention, Palmerholland's Unilink4200 and ALBEMARLE's DETDA may be used as aromatic diamines, and Palmerholland's Clearlink1000, Huntsman's Jefflink754, and Basf's Polyclear136 may be used as aliphatic diamines.

The content of the crosslinking agent is preferably 20 to 30 parts by weight. When the content is less than 20 parts by weight, the effect as a chain extender is insignificant, so it is difficult to expect improvement in mechanical properties. It is undesirable because it causes

In addition, inorganic fillers included in the subject matter are used to improve dimensional stability and impact resistance, and to improve heat resistance, base resistance, acid resistance, and chemical resistance while improving corrosion resistance and rust prevention effects. It is preferable to use single or a mixture thereof from the group consisting of ceramic powder, alumina, silica, zirconium, zinc phosphate, zinc dust, calcium carbonate, barium sulfate and talc.

The content of the inorganic filler is preferably 7 to 12 parts by weight. When the content is less than 7 parts by weight, the desired anti-corrosion/rust resistance, chemical resistance, and chemical resistance are lowered, and when it exceeds 12 parts by weight, the workability due to the increase in the viscosity of the composition this may be lowered.

In addition, Glass Milled Fiber, which is included in the subject matter, is a powder-type filler obtained by pulverizing glass fibers into a single fiber. become excellent Therefore, when included in the polyurea-based sheet of the present invention, it is possible to improve the durability of the sheet to improve resistance to impact, and to reinforce chemical properties such as corrosion resistance and heat resistance. That is, due to the tensile force and impact resistance strengthened by the glass milled fiber, the polyurea-based sheet of the present invention can provide a waterproof/anticorrosive sheet having excellent durability.

Preferably, the glass milled fiber may have an average fiber length of 10 to 100 μm, and preferably, an average fiber length of 10 to 50 μm. If the average fiber length of the glass milled fiber is less than 10㎛, problems such as workability may occur due to increase in the viscosity of the product. This is because there may be problems with smoothness.

In addition, the glass milled fiber is included in an amount of 5 to 10 parts by weight. When it is less than 5 parts by weight, the effect is insignificant compared to the amount of added glass milled fiber, and when it exceeds 10 parts by weight, a problem of increasing the viscosity of the product may occur, and the increase in physical properties is relatively insignificant.

In addition, metallic ceramic pigments are pigments made by combining metal compounds at high temperatures to give the color of polyurea-based sheets. It is preferable that any one selected from the group consisting of cobalt, zinc, nickel, titanium, aluminum, lithium, and mixtures thereof is preferred. For example, P120 (Co-Al-Li pigment), P521 (Co-Al pigment), P600 (Co-Ni-Zn-Ti pigment) manufactured by Hanil may be used.

The content of the metallic ceramic pigment is preferably 5 to 10 parts by weight, and may be appropriately adjusted within the above range in order to form a chemically stable waterproof/anticorrosive layer and to express a color of a desired concentration.

The additive may be mixed or used alone within the range of 3 to 6 parts by weight of an adhesion promoter, an antifoaming agent, a UV stabilizer, and the like, which are typically used in a paint composition.

The adhesion promoter serves to reinforce the adhesion to the substrate and the strength of the polyurea-based sheet. For example, an epoxy functional silane from Momentive can be used.

An antifoaming agent is added to prevent the occurrence of bubbles, and one or more of a mineral oil-based antifoaming agent, a silicone-based antifoaming agent, and a non-silicone-based polymer antifoaming agent can be selected and used. Can be used.

The UV stabilizer prevents premature deterioration caused by UV rays, and for example, Ciba's Tinuvin 328 product can be used.

The additive is added in consideration of the physical properties of the polyurea-based sheet to reinforce adhesion to the substrate, reinforce the strength of the composition, suppress air bubbles and prevent premature deterioration, etc., but when it is less than 6 parts by weight, the effect is insignificant, 9 When it exceeds parts by weight, it is not preferable because the effect is not significantly improved and there is a risk of lowering other physical properties of the composition.

In addition, the curing agent of the present invention is obtained by reacting 60 to 80 parts by weight of an isocyanate mixture and 20 to 40 parts by weight of Epoxidized Hydroxyl-Terminated Polybutadiene (EHTPB) at 60 to 100° C. for 2 to 3 hours.

At this time, the isocyanate mixture is methylene diphenyl diisocyanate (MDI), toluene diisocyanate (TDI), hexamethylene diisocyanate (Hexamethylene Diisocyanate, HDI), hexamethylene diisocyanate trimer (HDT), iso It may be obtained by mixing at least one selected from the group consisting of porone diisocyanate (Isophorone Diisocyanate, IPDI) and cyclohexylmethane diisocyanate (H _{12 MDI).}

The epoxidized hydroxyl-terminated polybutadiene (EHTPB) serves to improve adhesion to various substrates, water resistance, chemical resistance, flexibility and impact resistance. Specifically, hydroxyl-terminated polybutadiene resins can form 3D network-structured solids with extended-chain solvents and inter-chain solvents at room temperature or high temperature, resulting in excellent dynamic performance and resistance to hydrolysis, acid and lye, pulverization, and low temperature. It has electrical insulation properties. That is, in the present invention, by further including a hydroxyl-terminated polybutadiene resin in the curing agent, a network is formed in the curing process to remarkably increase adhesiveness, exhibit excellent ductility by butadiene group, and impart chemical resistance, heat resistance and electrical insulation. do. An epoxy group is introduced and epoxidized to increase the polarity of a large molecule, and the introduced epoxy group becomes a reactive functional group, which increases the mechanical properties, adhesive strength and heat resistance of polyurea after curing. Accordingly, the polyurea-based sheet of the present invention can exhibit excellent adhesion to various substrates, and improve water resistance, chemical resistance, flexibility and impact resistance. Preferably, the epoxidized hydroxyl-terminated polybutadiene resin may include at least one compound represented by the following Structural Formula 1 or Structural Formula 2.

More preferably, the epoxidized hydroxyl-terminated polybutadiene is represented by the following formula (1) and has a molecular weight of 100 to 10,000. For example, it may be an epoxidized hydroxyl-terminated polybutadiene having a molecular weight of 1,000 to 2,000.

<Formula 1>

However, the at least one epoxy-containing repeating unit described above and the one or more olefinic repeating units described above are present in the range of 1 to 20 of each repeating unit, and x may be in the range of 1 to 150.

The waterproofing/anticorrosive layer of the polyurea-based sheet for waterproofing of the present invention can be easily formed by pre-treating the base surface, applying a primer, and then quickly installing the polyurea-based sheet on the upper surface. Therefore, as another aspect, the present invention provides a pretreatment step of removing foreign substances from the base surface; coating a primer on the pretreated substrate; It relates to a waterproof/corrosive construction method using the waterproof/corrosive polyurea-based sheet, comprising; installing the waterproof/corrosive polyurea-based sheet on the primer coating surface to form a waterproof/corrosive layer.

At this time, the primer may be formed using a primer composition comprising 30 to 50 parts by weight of an oil-modified biopolyol, 15 to 30 parts by weight of an isocyanate compound, 5 to 10 parts by weight of a moisture remover, and 15 to 30 parts by weight of a viscosity modifier. .

Preferably, the oil-modified bio-polyol is a raw material in which two bonds (polyether bond and polyester bond) are branched in one molecule, and the average molecular weight is 500 to 1,000. It has a low molecular weight and three or more functional groups, giving it strong and dense physical properties, thereby exhibiting hydrophobicity and providing excellent stability against hydrolysis.

In addition, the isocyanate compound is a raw material that is combined with an oil-modified biopolyol through a chemical reaction, and serves to improve adhesion, flexibility, and impact resistance.

In addition, the moisture remover reacts with moisture or moisture present in the concrete to give the function of preventing the lifting phenomenon or pinholes of the waterproof/corrosive layer of the present invention. More preferably, an oxazolidine compound can be used.

As the viscosity modifier, it is preferable to use a propylene carbonate-based compound that does not emit volatile organic compounds in order to ensure the fluidity of the primer, the reaction proceeds smoothly, and the penetration into the inside of the substrate is easy.

As described above, according to the waterproof/corrosive construction method using the waterproof/corrosive polyurea-based sheet of the present invention, the rapid installation of the polyurea-based sheet at the desired construction site at the construction site ensures a short construction period and a constant thickness of the waterproof/corrosive layer It is possible to form a waterproof and anticorrosive layer with excellent protective effect on the substrate. In addition, when necessary, in the vulnerable or defective parts of various structures, where reinforcement is required due to aging or deterioration of the structure, it is fixed with a fixing pin using a fixing tool to prevent lifting and sagging of the waterproof/corrosive layer of the present invention. of long-term durability.

Hereinafter, the present invention will be described in more detail by way of Examples, but the scope of the present invention is not limited by the Examples.

<Examples 1-3 and Comparative Examples 1-2>

Polyoxypropylene diamine 30-40 wt%, polyoxypropylene triamine 5-15 wt%, aromatic diamine 10-15 wt%, aliphatic diamine 10-15 wt%, inorganic filler 7-12 wt%, glass milled fiber 5~ The subject matter of Examples 1 to 3 was prepared in the range of 10% by weight, 5 to 10% by weight of metallic ceramic pigment, and 6 to 9% by weight of additives.

The curing agent of Examples 1 to 3 was prepared by using 60 to 80% by weight of the isocyanate mixture and 20 to 40% by weight of epoxidized hydroxyl-terminated polybutadiene.

In Comparative Examples 1 and 2, the main agent and the curing agent were prepared by varying the contents of aliphatic diamine, inorganic filler, glass milled fiber, and epoxidized hydroxyl-terminated polybutadiene.

Specific formulations are shown in Table 1 below.

item Example
One Example
2 Example
3 Comparative Example 1 Comparative Example 2 main
My
wealth Polyoxypropylene amine mixture polyoxy propylene diamine 37 33 37 32 30 polyoxypropylene triamine 13 10 9 18 15 crosslinking agent
(Chain extender) aromatic diamine 10 13 14 15 10 aliphatic diamine 10 12 11 12 6 inorganic filler 10 11 8 6 13 Glass Milled Fiber 6 7 7 3 12 (Metallic Ceramic) Pigment 7 7 7 7 7 additive UV Stabilizer 2 2 2 2 2 adhesion promoter 3 3 3 3 3 antifoam 2 2 2 2 2 Sum 100 100 100 100 100 Kyung
fury
My
wealth isocyanate mixture MDI 72 70 50 62 70 TDI 15 12 EHTP 28 30 35 38 18 Sum 100 100 100 100 100

physical test

A physical property test was performed on the polyurea-based sheet for waterproofing and anticorrosion prepared in Examples 1 to 3 and Comparative Examples 1 to 2.

1. First, a physical property test was performed for test items related to mechanical properties in Table 2 below, and the results are summarized and shown.

Test Items Example
One Example
2 Example
3 Comparative Example 1 Comparative Example 2 Test Methods The tensile strength O O O O △ KS F 4911 elongation O O O O O tear strength O O O O △ Crack responsiveness -20℃ O O O △ O KS F 4936 20℃ O O O O O Adhesive strength O O O O △ chemical resistance acid resistance
(10%, H ₂ SO ₄ ) O O O X △ KS M ISO 2812-1 alkali resistance
(30%, NaOH) O O O △ O * O: Excellent, △: Average, X: Poor

Referring to this, it can be confirmed that the waterproof/corrosive polyurea-based sheet of the present invention has excellent tensile strength, elongation rate, and tear strength, and exhibits excellent results in terms of crack responsiveness, adhesion strength, and chemical resistance.

However, in Comparative Example 1, where the content of glass milled fiber and the content of inorganic fillers was small, the crack resistance at -20°C was lowered, and the acid resistance was very poor and the alkali resistance was also lowered, so that the chemical resistance was significantly reduced. This is because, due to the low content of inorganic filler and glass milled fiber, tensile strength and impact resistance were not strengthened and chemical properties were not reinforced.

In addition, in the case of Comparative Example 2, in which the content of the crosslinking agent was relatively small and the content of epoxidized hydroxyl-terminated polybutadiene was small, the physical properties in terms of tensile strength, tear strength, and adhesion strength were lowered and acid resistance was also lowered. Because the content of epoxidized hydroxyl-terminated polybutadiene, which plays a role in improving adhesion to the substrate, water resistance, chemical resistance, flexibility and impact resistance, is low, adhesion cannot be imparted during the curing process and chemical resistance It means you haven't improved.

2. Eco-friendly test items, test methods and test results are shown in Table 3 below.

Test Items Example 1 Example 2 Example 3 Test Methods 4 cars
heavy metal
(mg/kg) Lead (Pb) non-detection non-detection non-detection KS M ISO 3856-1 Cadmium (Cd) non-detection non-detection non-detection KS M ISO 3856-4 Mercury (Hg) non-detection non-detection non-detection KS M ISO 3856-7 Hexavalent Chromium (Cr6+) non-detection non-detection non-detection KS M ISO 3856-5 VOCs (g/L) criteria met criteria met criteria met KS M ISO 11890-2 VACs (%) non-detection non-detection non-detection ASTM D 3257 dissolution test criteria met criteria met criteria met Test method for sanitary safety standards of materials and products for water supply

Looking at the eco-friendliness with reference to Table 3, the polyurea-based sheets for waterproofing and anticorrosion according to Examples 1 to 3 did not detect any lead, cadmium, mercury, hexavalent chromium, etc., and did not contain a solvent, so volatile organic While satisfying the emission standards of compounds, volatile aromatic hydrocarbons are not detected, and it can be confirmed that eco-friendliness is very satisfied by satisfying the standards of the sanitary and safety standards test method for water supply materials and products.

As described above, the waterproof/anticorrosive polyurea-based sheet according to the present invention reinforces the mechanical and chemical properties of the polyurea waterproofing sheet with excellent physical properties and improves the adhesive strength, while controlling the content of the crosslinking agent in the subject matter. By mixing milled fiber and inorganic filler and including epoxidized hydroxyl-terminated polybutadiene in the curing agent, physical properties such as adhesion strength, tensile strength, and crack resistance are significantly improved, thereby providing excellent protection of the base surface such as concrete. Furthermore, the waterproof/corrosive polyurea-based sheet of the present invention can form a uniform quality and homogeneous waterproof/corrosive layer through simple construction by a sheet type.

The foregoing has outlined rather broadly the features and technical advantages of the present invention in order that the following claims may be better understood. Those of ordinary skill in the art to which the present invention pertains will understand that the present invention may be embodied in other specific forms without changing the technical spirit or essential features thereof. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the claims and their equivalent concepts should be construed as being included in the scope of the present invention.

Claims (4)

35 to 55 parts by weight of the polyamine mixture, 20 to 30 parts by weight of a crosslinking agent, 7 to 12 parts by weight of an inorganic filler, 5 to 10 parts by weight of glass milled fiber, 5 to 10 parts by weight of a metallic ceramic pigment, and 6 to 9 additives a subject comprising parts by weight;
60 to 80 parts by weight of the isocyanate mixture, 20 to 40 parts by weight of Epoxidized Hydroxyl-Terminated Polybutadiene (EHTPB) at 60 to 100° C. for 2 to 3 hours. A curing agent obtained by reacting,
The epoxidized hydroxyl-terminated polybutadiene has the following formula (1),
<Formula 1>

The crosslinking agent contains 10 to 15 parts by weight of an aromatic diamine used as a chain extender and 10 to 15 parts by weight of an aliphatic diamine. Polyurea-based sheet for waterproofing and anticorrosion. delete The method of claim 1,
The polyamine mixture is mixed with 30-40 parts by weight of polyoxypropylene diamine and 5-15 parts by weight of polyoxypropylene triamine, characterized in that the weight average molecular weight is 200-5000, polyurea-based sheet for waterproofing and anticorrosion. A pretreatment step of removing foreign substances from the base surface;
coating a primer on the pretreated substrate; and
Forming a waterproof/anticorrosive layer by installing the waterproof/anticorrosive polyurea-based sheet according to any one of claims 1 to 3 on the primer coating surface;
A waterproof/corrosive construction method using a polyurea-based sheet for waterproofing/corrosion, characterized in that it has a function of protecting the concrete base surface by having tensile strength, tear strength and chemical resistance.