KR102765973B1 - A composite waterproof sheet equipped with a high heat-resistant coating waterproofing material with improved waterproofing performance and a coating waterproofing material layer manufactured therefrom - Google Patents

Abstract

The present invention relates to a highly heat-resistant coating waterproofing material with improved waterproofing performance, characterized in that it comprises a subject matter containing an isocyanate group-terminated prepolymer; and a curing agent containing calcium carbonate and cordierite, the surface of which is modified with a silane-containing acrylic resin; and a composite waterproofing sheet having a coating waterproofing material layer manufactured therefrom. Since the coating has excellent thermal shock resistance and heat resistance due to the inclusion of cordierite, the coating can be stably maintained for a long time even when exposed to ultraviolet rays and heat for a long time, and since the change in physical properties according to temperature change is small, the coating has excellent durability and adhesion, and from this, a coating waterproofing material for a rubberized asphalt sheet having excellent waterproofing performance and a composite waterproofing sheet including the coating waterproofing material can be provided.

Description

{A composite waterproof sheet equipped with a high heat-resistant coating waterproofing material with improved waterproofing performance and a coating waterproofing material layer manufactured therefrom}

The present invention relates to a high heat-resistant coating waterproofing material with improved waterproofing performance and a composite waterproofing sheet having a coating waterproofing material layer manufactured therefrom. More specifically, the present invention relates to a coating waterproofing material that can be provided at a certain thickness on a self-adhesive or non-adhesive rubberized asphalt sheet member, which has excellent adhesion to a base surface and improved mechanical strength, heat resistance and durability as a sheet upper layer coating waterproofing material, and a composite waterproofing sheet including the same.

Concrete, which is usually used as a core material in the construction field, is a discontinuous, anisotropic and non-homogeneous hardened body made by mixing cement, aggregate, water and other admixtures, and its physical and chemical properties are very diverse and complex. Such concrete is likely to have many pores or microcracks from the manufacturing stage due to hydration reaction, bleeding, hydration heat, plastic shrinkage and different characteristics of materials. When concrete hardens, microcracks generated during the manufacturing stage grow into cracks in the structure due to various factors such as drying shrinkage, thermal stress and external load.

When rainwater, etc., seeps into cracks in urban structures, some of it does not evaporate but instead seeps inside, adversely affecting the durability of the structure. Therefore, various waterproofing materials are applied to the surface of building structures. In particular, cracks in concrete are the biggest cause of water leakage in structures, and chemical corrosion is a factor that reduces the long-term durability of structures. Therefore, waterproofing materials play a very important role in extending the life of structures and preventing water leakage.

These waterproofing methods are broadly divided into sheet waterproofing methods in which sheets with waterproofing properties are attached to the surface of a building, and film waterproofing methods in which a liquid coating material is applied to the surface of a building, dried, and hardened to form a waterproof coating material. Film waterproofing methods are further classified into asphalt waterproofing methods and polymer film waterproofing methods.

Asphalt waterproofing technology has the longest history of use and has accumulated a lot of construction experience, but because it must be heated and melted at the construction site, the work environment safety is low, and there is a problem that the waterproofing performance is easily lost due to self-cracking of the waterproofing film caused by temperature differences.

Polymer coating waterproofing method is a method in which a polymer waterproofing coating material with a waterproof function, such as urethane or epoxy, is applied to the surface to be constructed, and a waterproof coating layer is formed through a chemical reaction or volatilization of the solvent. It has the advantages of being easy to construct and having good adhesion to the construction surface, but since it is a method that adheres completely to the floor surface, it is difficult to fundamentally resolve issues such as cracks in the subfloor or response to temperature and environmental behavior, and there is a high possibility that swelling will occur due to evaporation of moisture in the concrete, resulting in loss of waterproofing performance.

Sheet waterproofing method is a method of making waterproofing sheets of a certain standard using synthetic rubber, synthetic resin, or rubberized asphalt with excellent elasticity as the main raw material, and has the advantages of uniform thickness, short construction period, easy handling, and good finish. However, it has the problem that the joint construction between sheets is difficult and partial repair is difficult in case of leakage after construction. In addition, since the fundamental problem is the low adhesion to the base material and durability, a solution to overcome these is required, and the development of a waterproofing film with stability and durability is necessary.

Recently, various sheet-type waterproofing materials have been widely used due to their convenience in application and ease of use. In order to solve the above problems, research is needed on sheet-type coating waterproofing materials that have improved adhesion to the base surface, mechanical strength, and durability without deteriorating the waterproofing quality.

Republic of Korea Patent Publication No. 10-0334602 (April 16, 2002)

In order to solve the above problems, the present invention aims to provide a high heat-resistant coating waterproofing material with improved waterproofing performance and a composite waterproofing sheet having a coating waterproofing material layer manufactured therefrom. Since cordierite is contained and thus has excellent thermal shock resistance and heat resistance, the coating can be stably maintained for a long period of time even when exposed to ultraviolet rays and heat for a long period of time, and since the change in physical properties according to temperature change is small, it can have excellent durability and adhesion, and in addition, a coating waterproofing material for a self-adhesive or non-adhesive rubberized asphalt sheet with improved waterproofing performance and a composite waterproofing sheet including the same can be provided.

However, the above purpose is exemplary, and the technical idea of the present invention is not limited thereto.

One aspect of the present invention for achieving the above object relates to a highly heat-resistant coating waterproofing material with improved waterproofing performance, characterized in that it comprises a subject matter containing an isocyanate group-terminated prepolymer; and a curing agent containing calcium carbonate and cordierite surface-modified with a silane-containing acrylic resin.

In the above aspect, the isocyanate group-terminated prepolymer may be formed by polymerizing polyoxypropylene glycol and toluene diisocyanate.

In the above aspect, the curing agent may contain polyalkylene polyol.

In the above aspect, the silane-containing acrylic resin may have a viscosity of 5,000 to 10,000 cps (25°C) and a weight average molecular weight of 500 to 2,000 g/mol.

In the above aspect, the silane-containing acrylic resin may be included in an amount of 5 to 15 parts by weight relative to 100 parts by weight of calcium carbonate.

In the above aspect, the polyalkylene polyol may be at least one selected from polyethylene glycol, polypropylene glycol, polyoxyethylene glycol, polyoxypropylene glycol, and polybutadiene styrene glycol.

In the above aspect, the curing agent may include 10 to 25 parts by weight of the cordierite and 50 to 80 parts by weight of the polyalkylene polyol relative to 100 parts by weight of calcium carbonate.

In the above aspect, the subject matter and the curing agent may be mixed in a weight ratio of 1:0.5 to 2.0.

In addition, another aspect of the present invention relates to a composite waterproof sheet characterized in that a layer including a high heat-resistant coating waterproofing material with improved waterproofing performance is provided on the waterproof sheet.

In another aspect of the above, the waterproof sheet may be an asphalt sheet.

In the above other aspect, the asphalt sheet may be a self-adhesive or non-adhesive rubberized asphalt sheet.

The high heat-resistant coating waterproofing material with improved waterproofing performance according to the present invention is a polyurethane coating waterproofing material, which can be provided on a self-adhesive or non-adhesive rubberized asphalt sheet, and since it contains cordierite and thus has excellent thermal shock resistance and heat resistance, the coating can be stably maintained for a long period of time even when exposed to ultraviolet rays and heat for a long period of time, and since the change in physical properties due to temperature change is small, it can have excellent durability and adhesion. Accordingly, a coating waterproofing material with improved waterproofing performance can be provided.

In addition, a composite waterproof sheet having a layer including a high heat-resistant coating waterproofing material with improved waterproofing performance can be provided, which can have excellent effects in terms of heat resistance, durability, adhesion, and waterproofing performance.

Hereinafter, a high heat-resistant coating waterproofing material with improved waterproofing performance according to the present invention and a composite waterproofing sheet having a coating waterproofing material layer manufactured therefrom will be described in detail. The drawings introduced below are provided as examples so that those skilled in the art can sufficiently convey the spirit of the present invention. Therefore, the present invention is not limited to the drawings presented below and may be embodied in other forms, and the drawings presented below may be illustrated in an exaggerated manner to clarify the spirit of the present invention. At this time, if there is no other definition in the technical and scientific terms used, they have the meaning commonly understood by those skilled in the art to which this invention belongs, and a description of well-known functions and configurations that may unnecessarily obscure the gist of the present invention in the following description and the accompanying drawings will be omitted.

One aspect of the present invention relates to a highly heat-resistant coating waterproofing material with improved waterproofing performance, characterized in that it comprises a subject matter containing an isocyanate group-terminated prepolymer; and a curing agent containing calcium carbonate and cordierite surface-modified with a silane-containing acrylic resin.

The above-mentioned high-heat-resistant coating waterproofing agent with improved waterproofing performance is a polyurethane coating waterproofing agent, and since it contains cordierite, it has excellent thermal shock resistance and heat resistance, so that the coating can be stably maintained for a long time even when exposed to ultraviolet rays and heat for a long time, and since the change in physical properties due to temperature change is small, it can have excellent durability and adhesion. In addition, since the cordierite is surface-modified and included so as to improve dispersibility in the coating waterproofing agent composition, and calcium carbonate is also surface-modified and included, the mechanical properties such as tensile strength, elongation, and tear strength, as well as heat resistance characteristics, are improved, and the risk of defects is reduced, so that the waterproofing performance of the coating waterproofing agent layer can be improved, which has the advantage of.

Hereinafter, a high heat-resistant waterproof coating material with improved waterproof performance according to an example of the present invention will be described in more detail.

In one example of the present invention, an isocyanate group-terminated prepolymer contained in the subject matter is described.

The above isocyanate group-terminated prepolymer (hereinafter, the same as the prepolymer) is a low molecular weight polymer compound or oligomer compound produced by the reaction of a diisocyanate compound and a polyalkylene polyol, and may be in a form in which isocyanate groups are bonded to both terminals. The above diisocyanate compound may be at least one selected from methylene diphenyl diisocyanate (MDI), toluene diisocyanate (TDI), hexamethylene diisocyanate (HMDI), isophorone diisocyanate (IPDI), meta-xylene diisocyanate (MXDI), tetramethylxylene diisocyanate (TMXDI), a diisocyanate made by adding hydrogen to the benzene ring of MDI to form an alicyclic compound (H12 MDI), and a diisocyanate made by adding hydrogen to the benzene ring of xylene diisocyanate (XDI) to form an alicyclic compound (hydrogenated XDI), and specifically, it may be toluene diisocyanate (TDI). The above polyalkylene polyol may be at least one selected from polyethylene glycol, polypropylene glycol, polyoxyethylene glycol, polyoxypropylene glycol, and polybutadiene styrene glycol, and specifically may be polyoxypropylene glycol having a weight average molecular weight of 1,000 to 5,000 g/mol.

The components included in the above subject matter are not limited thereto, and one or more additives selected from diluents, plasticizers, anti-foaming agents, antioxidants, ultraviolet absorbers, moisture absorbers, wetting and dispersing agents, catalysts, and flame retardants may be further included as needed, and the content thereof may be selected and included within a normal range.

Next, we will explain about the hardener.

In one example of the present invention, the curing agent may contain calcium carbonate, cordierite, and polyalkylene polyol. The calcium carbonate and cordierite are characterized in that their surfaces are modified with a silane-containing acrylic resin. The silane-containing acrylic resin may be included in an amount of 5 to 15 parts by weight relative to 100 parts by weight of the calcium carbonate, and the cordierite may be included in an amount of 10 to 25 parts by weight relative to the calcium carbonate. In addition, the polyalkylene polyol may be included in an amount of 50 to 80 parts by weight relative to 100 parts by weight of the calcium carbonate.

Calcium carbonate plays an important role as a filler in polyurethane waterproofing material and in improving the mechanical strength of the entire waterproofing material, and can also play a role as a flame retardant because it is an inorganic material. It can fill the voids that occur in the composition, increase the volume, and maintain a constant thickness to form. Any calcium carbonate commonly used in the art may be used as the calcium carbonate, but it is preferable to use calcium carbonate having an average particle size of 500 to 1,000 nm. In order to maintain viscosity stability and improve adhesiveness of the polyurethane composition compared to when the calcium carbonate is used alone, a method is needed to increase compatibility between the calcium carbonate and the composition.

Meanwhile, cordierite is generally a ternary oxide (2MgO ₂ , Al ₂ O ₃ , 5SiO ₂ ) and has a lower coefficient of thermal expansion than other minerals, making it resistant to thermal shock and widely used in heat-resistant parts or refractories. The cordierite can be included in polyurethane waterproofing materials to lower the coefficient of thermal expansion, thereby preventing a decline in properties under extreme conditions such as heat, pressure or chemical, and improving mechanical properties such as tensile strength or tear strength and adhesion. However, although the cordierite has excellent thermal properties, it has an inorganic surface like calcium carbonate, so chemical surface modification is required to provide bonding strength and compatibility between waterproofing material components and to maximize the thermal shock resistance and heat resistance of cordierite.

Therefore, in the present invention, the calcium carbonate and cordierite can be mixed with a silane-containing acrylic resin and used in a state modified by the silane-containing acrylic resin.

The above silane-containing acrylic resin can additionally add scratch resistance and excellent adhesion to the polyurethane coating waterproofing material. In addition, since it contains silane and functions as a silane coupling agent that connects organic and inorganic materials, it can be used for improving the mechanical strength of composite materials, controlling adhesiveness, modifying resin, or modifying surface. In particular, the silane-containing acrylic resin can form a strong chemical bond with the surface compared to the silane coupling agent that is widely used as a surface modifying agent, and can greatly improve the adhesiveness by the acrylic resin, thereby increasing the physical and chemical stability and improving the mechanical properties such as tensile strength and hardness.

The above silane-containing acrylic resin can be produced by polymerizing a silane compound and various acrylic monomers. The silane compound can be a silane coupling agent including an acrylic group capable of bonding with an acrylic monomer, and preferably can be 3-methacryloxypropyl trimethoxysilane. The acrylic monomer can be at least one selected from methyl methacrylate, methyl acrylate, butylacrylate, and butyl methacrylate, and more specifically, methyl (meth)acrylate and butyl (meth)acrylate can be used in mixture. Compared to using methyl acrylate or methyl methacrylate alone, mixing butylacrylate or butyl methacrylate can provide flexibility to the waterproofing film material and improve elasticity and impact resistance of the waterproofing film material, which is preferable.

In order to modify the calcium carbonate and cordierite included in the above curing agent, it is preferable to include the silane-containing acrylic resin in an amount of 5 to 15 parts by weight per 100 parts by weight of the calcium carbonate, and if it is included in a range of 15 parts by weight or more, the curing time may be extended or the properties of the waterproofing material may change, which is not good. In addition, the silane-containing acrylic resin is preferably one having a viscosity in the range of 5,000 to 10,000 cps (25°C) because it is easy to mix into the composition and provides appropriate adhesion, and one having a weight average molecular weight in the range of 500 to 2,000 g/mol has excellent compatibility with polyalkylene polyol and high reactivity with inorganic substances, so that it can easily modify calcium carbonate and cordierite.

The above cordierite is in powder form and has a purity of 90% or more. It is preferable to use a particle size of 10 to 50 ㎛, but it is not necessarily limited thereto.

In this way, calcium carbonate and cordierite surface-modified with silane-containing acrylic resin have improved compatibility in a waterproof coating composition, thereby imparting stability and improving the mechanical properties of a polyurethane coating in the future. In addition, the surface-modified cordierite can maintain the inherent characteristics of cordierite more stably, thereby improving durability.

The above polyalkylene polyol provides a hydrogen donor capable of reacting with an isocyanate group at the terminal of the prepolymer of the above subject to form a polyurethane bond. The above polyalkylene polyol may be the same as or different from the polyalkylene polyol used in the production of the prepolymer of the above subject, and specifically may be polypropylene glycol having a number average molecular weight of 300 to 2,000 g/mol, and may be included in an amount of 50 to 80 parts by weight relative to 100 parts by weight of the calcium carbonate.

The above cordierite may be included in an amount of 10 to 25 parts by weight based on 100 parts by weight of the calcium carbonate. If the amount is less than 10 parts by weight, the desired effect may not be as expected, and if the amount is more than 25 parts by weight, the effect may not be significant compared to the amount added, and the physical properties of the polyurethane coating waterproofing material may be deteriorated, which is not preferable.

The above curing agent may additionally include a curing accelerator, and specifically, it may be at least one selected from dimethyltoluenediamine or diethyltoluenediamine as an amine-based substance. If the above curing accelerator is used in a relatively large amount, the hardness of the coating film may be reduced, and it is preferable to use it in a range of 0.2 to 8 parts by weight relative to 100 parts by weight of the calcium carbonate.

The components included in the above curing agent are not limited thereto, and one or more additives selected from a diluent, a plasticizer, an anti-foaming agent, an antioxidant, an ultraviolet absorber, a moisture absorbent, a wetting and dispersing agent, a catalyst, and a pigment may be further included as needed, and the specific type and content may be selected within a normal range.

The above-mentioned subject matter and hardener can be mixed in a weight ratio of 1:0.5 to 2.0 to achieve the desired effect, applied to a base surface, and then cured to produce a high heat-resistant waterproof coating material.

In addition, another aspect of the present invention relates to a method for producing a high heat-resistant coating waterproofing material layer, including a step of mixing, applying, and curing a subject matter containing an isocyanate group-terminated prepolymer; and a curing agent containing calcium carbonate and cordierite surface-modified with a silane-containing acrylic resin. The coating and curing processes of the high heat-resistant coating waterproofing material can be performed according to a conventional method used in the art.

Another aspect of the present invention relates to a composite waterproofing sheet characterized in that a layer including the above-mentioned high heat-resistant coating waterproofing material is provided on the waterproofing sheet. The sheet that can be the base surface of the above-mentioned high heat-resistant coating waterproofing material can be an asphalt sheet, and specifically, can be a self-adhesive or non-adhesive rubberized asphalt sheet. The architectural composite waterproofing sheet having the above-mentioned high heat-resistant coating waterproofing material layer has excellent heat resistance, durability, and adhesiveness, and thus can have improved waterproofing performance.

Hereinafter, the high heat-resistant film waterproofing material with improved waterproofing performance according to the present invention and the composite waterproofing sheet having a film waterproofing material layer manufactured therefrom will be described in more detail through examples. However, the following examples are only a reference for explaining the present invention in detail, and the present invention is not limited thereto, and may be implemented in various forms.

Also, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description herein is only for the purpose of effectively describing particular embodiments and is not intended to be limiting of the invention.

[Example 1 Manufacturing]

1. Preparation of silane-containing acrylic resin

To synthesize silane-containing acrylic resin, 300 g of xylene was placed in a 1 L four-necked flask, 110 g of methyl methacrylate (MMA), 150 g of butyl methacrylate (BMA), and 30 g of 3-methacryloxypropyl trimethoxysilane (MPTS) were added, and stirred. In a nitrogen atmosphere, a solution containing 3 g of azobisisobutyronitrile (AIBN) initiator and 6 g of trimethyl orthoformate (TMO) moisture remover was slowly added dropwise, while stirring and aging at 80°C for 120 minutes. Afterwards, a mixed solution of 4 g of AIBN dissolved in 10 g of xylene was slowly added dropwise and aged at 100°C for 30 minutes.

To the above mixture, 15 g of TMO and 100 g of xylene were further added to obtain a final product having a solid content of 50%, and after removing unreacted substances using an excess amount of normal hexane, a transparent and viscous silane-containing acrylic resin was manufactured. The viscosity of the manufactured silane-containing acrylic resin was 7,000 cps (25°C), and the weight average molecular weight was 950 to 1,050 g/mol.

2. Manufacturing of surface-modified calcium carbonate and cordierite

700 g of polypropylene glycol (PPG) was dispersed with 1,000 g of calcium carbonate and 200 g of cordierite (2MgO-2Al ₂ O ₃ -5SiO ₂ , average particle size of 20 ㎛). 8 parts by weight of the silane-containing acrylic resin was added to 100 parts by weight of the calcium carbonate, and the mixture was stirred to produce calcium carbonate and cordierite surface-modified with the silane-containing acrylic resin.

3. Preparation of hardener

A curing agent was prepared by mixing 1.0 part by weight of diethyltoluenediamine and other additives per 100 parts by weight of calcium carbonate into a solution of calcium carbonate and cordierite surface-modified with the above-mentioned silane-containing acrylic resin.

4. Preparation of waterproofing material of Example 1

As a prepolymer, 500 g of polyoxypropylene-toluene diisocyanate (TDI) polymer was mixed with 10 parts by weight of xylene, 10 parts by weight of bis(2-propylheptyl) phthalate, and 2 parts by weight of triphenyl phosphate relative to 100 parts by weight of the prepolymer to prepare a main agent, which was then mixed with the curing agent in a weight ratio of 1:1. This was applied to a mold at 2 ± 0.1 mm and cured while ensuring no air bubbles were present, thereby preparing a waterproofing coating of Example 1.

[Manufacture of Examples 2 to 4 and Comparative Examples 1 to 4]

The subject matter and the curing agent were prepared and mixed as in Example 1, but the content of the silane-containing acrylic resin was adjusted as shown in Table 1 below with respect to the components and content of the curing agent to prepare waterproofing film specimens of Examples 2 to 4 and Comparative Examples 1 to 4.

Weight part subject Hardener Prepolymer Calcium carbonate PPG Cordierite Silane-containing acrylic resin Example 1 100 100 70 20 5 Example 2 100 100 70 20 10 Example 3 100 100 70 20 15 Example 4 100 100 70 20 20 Comparative Example 1 100 100 70 20 - Comparative Example 2 100 100 70 - 15 Comparative Example 3 100 100 70 5 15 Comparative Example 4 100 100 70 30 15

[Characteristic evaluation method]

1) Tensile performance: After evaluation according to the KS F 3211: 2015 test standard, the results are shown in Table 2 below.

2) Tear performance: After evaluation according to the KS F 3211: 2015 test standard, the results are shown in Table 2 below.

3) Adhesion performance: After evaluation according to the KS F 3211: 2015 test standard, the results are shown in Table 2 below.

4) Temperature dependence and tensile performance after heat treatment: After evaluation according to the KS F 3211: 2015 test standard, the results are shown in Table 2 below.

test
item Tensile performance Heat performance Adhesive performance tensile strength
(N/㎟) Elongation rate (%) Tear strength (N/㎜) Bond strength (N/㎟)
(Unprocessed) Bonding strength
(N/㎟)
(After repeated hot and cold treatment) State of the coating Performance criteria 2.5 or higher 450 or more 14.7 or higher 0.7 or higher 0.5 or higher There will be no peeling or lifting of the coating. Example 1 2.7 729 15.6 1.0 0.8 No problem Example 2 2.9 770 16.4 1.0 0.8 No problem Example 3 3.3 887 17.2 1.1 0.9 No problem Example 4 3.1 911 14.6 1.0 0.9 Partial peeling Comparative Example 1 1.9 565 13.3 0.7 0.4 Peeling Comparative Example 2 1.8 497 12.9 0.9 0.6 No problem Comparative Example 3 2.2 612 14.2 0.8 0.4 No problem Comparative Example 4 2.3 503 13.5 1.0 0.5 Peeling

test
item Temperature dependence Tensile performance after heat treatment Tensile strength ratio (%) Elongation rate (%) Tensile strength ratio
(%) Elongation rate
(%) -20℃ 60℃ -20℃ 20℃ 60℃ Performance criteria 100 or more 60 and above 250 or more 300 or more 200 or more 80 or more and 150 or less 400 or more Example 1 101 69 392 401 413 89 696 Example 2 116 74 395 455 490 99 712 Example 3 135 74 ≥500 ≥500 ≥500 107 821 Example 4 120 106 454 ≥500 ≥500 130 684 Comparative Example 1 101 67 371 396 390 82 645 Comparative Example 2 78 49 296 286 267 76 453 Comparative Example 3 101 58 370 372 296 78 545 Comparative Example 4 102 72 285 456 467 92 713

Examples 1 to 3 of the above Tables 2 and 3 contain 5 to 15 parts by weight of silane-containing acrylic resin relative to 100 parts by weight of calcium carbonate, and it can be seen that they have superior physical properties compared to Comparative Example 1 where no silane-containing acrylic resin is included. Comparative Example 1 does not contain silane-containing acrylic resin, so cordierite and calcium carbonate are in an unmodified state. Although the heat resistance was excellent due to the inclusion of cordierite, the adhesion was not imparted, resulting in reduced adhesion strength and poor coating material condition. Example 4 contains 20 parts by weight of silane-containing acrylic resin, and although the elongation and adhesion were excellent, the tensile strength and tear strength were similar to or even lower than those of Example 3. Therefore, it can be seen that it is difficult to expect a remarkable effect compared to the addition amount in a range exceeding 15 parts by weight, and as shown in Table 3, it can be seen that the heat resistance may be impaired. From this, it was confirmed that the silane-containing acrylic resin can have properties such as a tensile strength of 2.7 N/mm2 or more, an elongation of 729% or more, and a tear strength of 15.6 N/mm or more in the range of 5 to 15 parts by weight relative to 100 parts by weight of calcium carbonate.

Meanwhile, Comparative Example 2, to which cordierite was not added in Table 2, had lowered tensile strength and tear strength, and in particular, referring to Table 3, the temperature dependency and tensile performance after heat treatment were poor. In addition, Comparative Example 3, in which cordierite was contained in an amount of 3 parts by weight relative to 100 parts by weight of calcium carbonate, showed temperature dependency and tensile performance after heat treatment that did not reach the values of Examples 1 to 4. It can be seen that Comparative Example 4, in which cordierite was contained in an amount of 30 parts by weight, had improved heat resistance from the excellent temperature dependency and tensile performance after heat treatment. However, judging from the phenomenon of the coating material being peeled off in Table 2, the adhesion performance was poor, and it was confirmed that when surface-modified cordierite was added in the range of 5 to 15 parts by weight of silane-containing acrylic resin and 10 to 25 parts by weight of cordierite per 100 parts by weight of calcium carbonate, it can have excellent properties in terms of tensile strength, tear strength, adhesion strength, and heat resistance. Specifically, a tensile strength of 2.7 N/mm2 or more, an elongation of 729% or more, and a tear strength of 15.6 N/mm2 or more were achieved, and in particular, a tensile strength ratio of 69 to 74% and an elongation of 413% or more at 60℃ were exhibited, showing excellent heat resistance characteristics. In addition, a result was obtained in which the adhesion performance was 0.8 to 0.9 N/mm2 after repeated cold and hot treatments without any peeling of the coating material.

In this way, the high heat-resistant film waterproofing material with improved waterproofing performance according to the present invention and the composite waterproofing sheet having a film waterproofing material layer manufactured therefrom have excellent heat resistance, adhesion, and mechanical properties, and are stable to temperature changes, so that the risk of defects is low, and accordingly, the waterproofing performance can be improved.

Although the present invention has been described through specific matters and limited examples as above, these have been provided only to help a more general understanding of the present invention, and the present invention is not limited to the above examples, and those skilled in the art to which the present invention pertains can make various modifications and variations from this description.

Therefore, the idea of the present invention should not be limited to the described embodiments, and all things that are equivalent or equivalent to the claims described below as well as the claims are included in the scope of the idea of the present invention.

Claims (10)

A subject matter comprising an isocyanate group-terminated prepolymer; and
A curing agent containing calcium carbonate and cordierite surface-modified with a silane-containing acrylic resin;
It consists of,
The above silane-containing acrylic resin has a viscosity of 5,000 to 10,000 cps (25°C) and a weight average molecular weight of 500 to 2,000 g/mol.
Calcium carbonate and cordierite surface-modified with the above silane-containing acrylic resin are
A high heat-resistant coating waterproofing material with improved waterproofing performance, characterized in that the surface is modified by including 5 to 15 parts by weight of the silane-containing acrylic resin and 10 to 25 parts by weight of cordierite relative to 100 parts by weight of calcium carbonate. In paragraph 1,
A high heat-resistant coating waterproofing material characterized in that the above isocyanate group-terminated prepolymer is formed by polymerization of polyoxypropylene glycol and toluene diisocyanate. In paragraph 1,
A high heat-resistant waterproofing coating material characterized in that the above-mentioned hardener contains polyalkylene polyol. delete delete In the third paragraph,
A high heat-resistant coating waterproofing material, characterized in that the polyalkylene polyol is at least one selected from polyethylene glycol, polypropylene glycol, polyoxyethylene glycol, polyoxypropylene glycol, and polybutadiene styrene glycol. In paragraph 1,
A high heat-resistant waterproofing coating material characterized in that the above-mentioned subject matter and hardener are mixed in a weight ratio of 1:0.5 to 2.0. A composite waterproofing sheet characterized in that a layer including a high heat-resistant coating waterproofing material according to any one of claims 1 to 3 and 6 to 7 is provided on the waterproofing sheet. In Article 8,
A composite waterproof sheet characterized in that the above waterproof sheet is an asphalt sheet. In Article 9,
A composite waterproof sheet characterized in that the above asphalt sheet is a self-adhesive or non-adhesive rubberized asphalt sheet.