KR102290324B1 - Dual complex waterproof sheet and waterproof method using the same - Google Patents

Abstract

The present invention relates to a dual complex waterproof sheet, and a waterproofing method using the same. The dual complex waterproof sheet comprises: a waterproof layer (110) having a silicon waterproof composition; and an upper sheet (120) laminated on an upper portion of the waterproof layer (110), wherein the upper sheet (120) comprises a non-woven fabric layer (121), an asphalt layer (122), and a protection film layer (123). According to the present invention, dual complex waterproof performance is realized by the waterproof layer (110) formed by the silicon waterproof composition and the upper sheet (120) having the asphalt layer (122) to have excellent waterproof performance, and a waterproof composition which has excellent low-temperature workability and physical properties and which is made of a silicon material with the excellent waterproof performance is used as a waterproof layer to improve the waterproof performance and workability.

Description

Double complex waterproof sheet and waterproof construction method using the same {Dual complex waterproof sheet and waterproof method using the same}

The present invention relates to a double composite waterproofing sheet and a waterproofing construction method using the same, and more particularly, to a waterproofing layer including a silicone waterproofing composition and an upper sheet laminated on top of the waterproofing layer. It relates to a composite waterproofing sheet and a waterproofing construction method using the same.

In the case of civil structures such as the roof of a concrete building, the upper part of an underground parking lot, an underground outer wall, a subway, an underpass, and a common area, when moisture such as rainwater seeps into the building without evaporating some of the moisture, a comfortable residence for the actual occupant In addition to the environmental aspect of maintaining the environment, as it accelerates deterioration due to corrosion or neutralization of reinforcing bars and steel frames due to water leakage, freezing and thawing, intrusion of harmful substances, etc. In terms of preventing deterioration of durability, such as construction and civil engineering structures, waterproof construction is required.

The waterproofing method of concrete structures is largely divided into the penetrative waterproofing method and the encapsulated waterproofing method. The penetrating waterproofing method is a method of improving the waterproofness by applying a waterproofing agent to the concrete surface to change the concrete itself in detail, and the encapsulated waterproofing method is a method of improving the waterproofness of the structure. It is a waterproofing method that improves waterproofness by forming several layers of impermeable waterproofing layers inside and outside the building to cope with cracks in concrete structures or other construction defects.

The film waterproofing method is divided into asphalt waterproofing, urethane waterproofing, sheet waterproofing, coating film waterproofing, etc. depending on the type and construction method of the material forming the impermeable waterproofing layer. The construction method is widely known.

For waterproofing using a urethane waterproofing agent or asphalt waterproofing agent, it is common to apply a waterproofing agent solution to the surface to be waterproofed several times using a spray or roller, and then harden it. However, since all of these work processes are performed manually, there are problems in that the amount of work per hour is small, the work time is long, and the construction cost is increased.

In addition, in general, organic solvents for improving fluidity and workability are added to urethane waterproofing agents or asphalt waterproofing agents, and such organic solvents cause air pollution when volatilized and may adversely affect the human body.

In addition, in the case of urethane waterproofing agents, the resistance to moisture in the part in contact with the construction target surface is weak, so the lifting phenomenon is frequent, and the crack suppression power is weak. And there is a problem that damage or breakage occurs easily.

On the other hand, the sheet waterproofing method is a method of waterproofing construction using a sheet having waterproofing performance including a waterproofing agent. The sheet waterproofing method can be constructed by fusion using a heating torch, or by using a self-adhesive waterproofing sheet that can be installed at room temperature.

As a waterproofing agent included in such waterproofing sheets, asphalt mastic waterproofing agents are usually used. In the case of asphalt mastic waterproofing agents, the content of total volatile organic compounds (TVOC) is high, which not only adversely affects the atmospheric air, but also affects residents due to its unique odor. There is a problem that causes discomfort.

In addition, the asphalt mastic waterproofing agent has low elasticity and fluidity compared to its hardness, so its low-temperature performance and resistance to structural behavior are low. Therefore, cracks easily occur in the asphalt mastic waterproofing layer when the low-temperature environment or structure contracts, relaxes, or vibrates. happens to happen

Therefore, there is an increasing demand for a new waterproof sheet that can replace the waterproof sheet using the asphalt mastic waterproofing agent or the urethane waterproofing agent, which is environmentally friendly and has excellent resistance to environmental changes or behavior of structures.

Registered Patent No. 10-2079572 (Registered on Feb. 14, 2020)

An object of the present invention is to provide a double composite waterproof sheet excellent in waterproof performance and workability, including a waterproof layer including a silicone waterproof composition and an upper sheet laminated on the waterproof layer, and a waterproof construction method using the same.

One embodiment of the present invention for achieving the object as described above, the waterproof layer 110 comprising a silicone waterproof composition; and an upper sheet 120 laminated on top of the waterproof layer 110, wherein the upper sheet 120 includes a nonwoven fabric layer 121, an asphalt layer 122, and a protective film layer 123 sequentially stacked. It relates to a double composite waterproof sheet, characterized in that.

The silicone waterproofing composition may be mixed in an amount of 1 to 5 parts by weight of a curing agent including a silane compound based on 100 parts by weight of the main agent including the silicone polymer.

The subject may include 18 to 35% by weight of a silicone polymer, 10 to 24% by weight of a silicone oil, 35 to 62% by weight of a filler, 5 to 12% by weight of a solvent, and 0.01 to 2.2% by weight of an additive.

The additive may include at least one selected from the group consisting of an antifoaming agent, a dispersing agent, a fragrance, and a pigment.

The silicone polymer may include a first silicone polymer having a number average molecular weight of 15,000 to 25,000 g/mol; and a second silicone polymer having a number average molecular weight of 70,000 to 90,000 g/mol.

The curing agent may include 65 to 80% by weight of a crosslinking agent, 19 to 34% by weight of a silane compound, and 0.05 to 1% by weight of a catalyst.

Another embodiment of the present invention relates to a waterproofing construction method for constructing the double composite waterproofing sheet, comprising: a pretreatment step of removing foreign substances from the construction target surface and planarizing; A primer application step of forming a primer layer by applying a primer to the construction target surface that has undergone the pretreatment step; A waterproofing layer forming step of forming a waterproofing layer 110 by applying a silicone waterproofing composition to the surface to which the primer is applied; and an upper sheet installation step of installing the upper sheet 120 on the waterproof layer.

The double composite waterproofing sheet of the present invention and a waterproofing construction method using the same include a waterproofing layer including a silicone waterproofing composition and an upper sheet laminated on the waterproofing layer, and have excellent waterproofing performance and workability.

1 is a view showing a double composite waterproof sheet constructed according to an embodiment of the present invention.

Hereinafter, before describing in detail through preferred embodiments of the present invention, terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, and meanings consistent with the technical spirit of the present invention and should be interpreted as a concept.

Throughout this specification, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless otherwise stated.

Throughout this specification, "%" used to indicate the concentration of a specific substance is (weight/weight)%, solid/liquid (weight/volume)%, and liquid, unless otherwise specified. /liquid means (volume/volume)%.

Hereinafter, an embodiment of the present invention will be described. However, the scope of the present invention is not limited to the following preferred embodiments, and those skilled in the art can implement various modified forms of the contents described herein within the scope of the present invention.

First, the present invention relates to a double composite waterproofing sheet used to impart waterproofing performance to civil structures such as a rooftop, an upper part of an underground parking lot, an underground outer wall, a subway, an underpass, and a common area, and a waterproofing construction method using the same.

The double composite waterproofing sheet of the present invention does not use an asphalt mastic-based waterproofing agent, so it is possible to prevent problems such as air pollution and adverse effects on the human body that occur during asphalt mastic construction, and the risk of using a torch during work is reduced Therefore, it has the advantage of being safe, and it has the advantage of being able to maintain waterproof performance in the long term because it can solve the problem of cracks and leakage due to cracks due to the characteristics of asphalt mastic waterproofing agents with low elasticity and fluidity.

First, Figure 1 is a view briefly showing a cross-section after construction of the double composite waterproof sheet 100 according to an embodiment of the present invention, referring to Figure 1, double composite waterproof sheet according to an embodiment of the present invention ( 100) is a waterproof layer 110 comprising a silicone waterproof composition; and an upper sheet 120 laminated on the waterproof layer 110 .

The waterproof layer 110 includes a silicone waterproof composition in which a main agent containing a silicone polymer and a curing agent containing a silane compound are mixed, and after construction, the silicone polymer and the silane compound react to form a cured product, so that the waterproof layer 110 is formed. It is possible to prevent water leakage or oil leakage problems by implementing waterproof performance.

The upper sheet 120 is a laminate including a nonwoven fabric layer 121 , an asphalt layer 122 , and a protective film layer 123 , and is disposed on the waterproof layer 110 so that the nonwoven fabric layer 121 is in contact with the waterproof layer 110 . can be formed.

The asphalt layer 122 included in the upper sheet 120 exhibits waterproof performance, and implements double composite waterproof performance together with the waterproof layer 110 including the silicone waterproof composition, so that of the double composite waterproof sheet 100 of the present invention. The waterproofing power can be further improved.

The non-woven fabric layer 121 is disposed to compensate for problems such as detachment of the upper sheet 120 due to a difference in behavior with the structure according to environmental changes, lack of flexibility and adhesive strength of the upper sheet 120 , and breakage of the joint.

Polyethylene nonwoven fabric, polypropylene nonwoven fabric, polyester nonwoven fabric, PET nonwoven fabric, etc. can be used as the nonwoven fabric layer 121, as well as synthetic fibers of various materials such as rayon fiber, nylon fiber, carding, thermal fusion method, needle punch method, A nonwoven fabric obtained by forming a nonwoven fabric by a method such as a water flow bonding method or a stitching method may be used.

In particular, it is preferable that a polyester long fiber nonwoven fabric is used, and the polyester long fiber nonwoven fabric has a high water content, so that the impregnation force for the asphalt layer 122 when the upper sheet 121 is manufactured and the waterproof layer 110 during construction. It is possible to improve the adhesion with the neighboring layer due to the excellent impregnation power.

In addition, it is possible to effectively protect the waterproof layer 110 and the asphalt layer 122 because it has excellent heat resistance, chemical stability, durability, workability, weather resistance, tensile and tear strength.

More preferably, a polyester long fiber nonwoven fabric having a density of 90 g / m ² or more may be used, and since this polyester long fiber nonwoven fabric has more improved durability and tensile strength, the waterproof layer 110 and the asphalt layer 122 . can be protected more effectively.

The asphalt layer 122 is a layer showing waterproof performance including asphalt, and may include binders, plasticizers, fillers, viscosity modifiers, catalysts, dispersants, etc. as needed to improve performance such as adhesion, physical properties, and durability. It is not limited thereto and may further include various additives.

The protective film layer 123 serves to alleviate the impact of the protective sheet 120 , to resist moisture, to prevent breakage of the asphalt layer 122 , to resist thermal deformation, and to soundproof. It may be formed of at least one material selected from the group consisting of ester, polyethylene, polyethylene terephthalate (PET), polyurethane, polyvinyl chloride and thermoplastic olefin (TPO), preferably polyethylene, more preferably It may be formed of a high-density polyethylene material.

Meanwhile, as described above, the silicone waterproof composition constituting the waterproof layer 110 includes a silicone waterproof composition in which a main agent including a silicone polymer and a curing agent including a silane compound are mixed.

The main agent and the curing agent may be mixed in an amount of 1 to 5 parts by weight of the curing agent with respect to 100 parts by weight of the main agent. If the content of the curing agent is less than 1 part by weight, the curing rate of the silicone polymer is excessively slowed, so that the working time required for construction becomes long. There is a problem in that the work efficiency is lowered, the physical properties of the waterproof layer 110 are lowered, and if it exceeds 5 parts by weight, the pot life is excessively fast, so that there is a problem that the work is impossible because it has already been cured before applying it to the construction target surface. , it is preferable to be used in a mixture in the above-mentioned weight range.

The subject contains 18-35% by weight of silicone polymer, 10-24% by weight of silicone oil, 35-62% by weight of filler, 5-12% by weight of solvent and 0.01-2.2% by weight of additive.

The silicone polymer reacts with a curing agent to cure, and is a main component that expresses physical properties such as waterproofness, strength, elasticity, weather resistance, and durability of the waterproofing layer 110 .

The silicone polymer may be polydimethylsiloxane (PDMS), and the polydimethylsiloxane is a material having two methyl groups based on a silonic acid bond (Si-O-Si) of silicon and oxygen, and has a low surface due to a siloxane bond. It is a material having both inorganic properties such as tension, oxidation resistance and non-volatile properties, and organic properties such as diffusivity by methyl group.

More preferably, the silicone polymer used in the present invention may be polydimethylsiloxane capped with hydroxyl groups at both ends. This polydimethylsiloxane has a structure of HO-PDMS-OH, forms hydrogen bonds by hydroxyl groups at both ends after reaction with a curing agent, and forms a network structure in which polymer chains are entangled to form a waterproof layer 110 having higher strength. ) can be formed.

The silicone polymer may be included in 18 to 35% by weight in the main body, and when it is included in less than 18% by weight, the waterproofing performance of the waterproof layer 110 by the silicone polymer, elasticity, weather resistance, adhesion, etc. The performance of (110) is significantly lowered, and when it exceeds 35 wt%, the content of other components is relatively reduced, which may cause a decrease in strength or workability of the waterproof layer 110, so it is included within the above-described weight range. It is preferable to be

As the silicone polymer, a first silicone polymer having a number average molecular weight of 15,000 to 25,000 g/mol and a second silicone polymer having a number average molecular weight of 70,000 to 90,000 g/mol may be used.

The second silicone polymer has a high molecular weight and has high properties such as water resistance, weather resistance, elasticity, adhesion, and strength. Problems such as phenomena may occur.

Accordingly, by using the first silicone polymer having a relatively low viscosity and excellent flowability and mixing properties, a separate solvent is not used or a very small amount can be used to improve the compatibility of the silicone polymer. It is possible to prepare a silicone waterproof composition contained in this high content.

In addition, since the first silicone polymer having a low molecular weight and the second silicone polymer having a high molecular weight are used together, the elasticity and tensile strength of the waterproof layer 110 are improved.

The first silicone polymer and the second silicone polymer may be mixed and used in a weight ratio of 1: 0.25 to 0.65, and when out of the above range, the effect of improving elasticity and tensile strength of the waterproof layer 110 is not obtained.

In addition, when the second silicone polymer is insufficiently used outside the above range, there is a problem in that the expression of physical properties by the silicone polymer is insignificant, the flowability is excessively improved and the workability is rather deteriorated, and the second silicone polymer is excessively used. When used, the viscosity is not sufficiently lowered, so that workability is deteriorated, and it is difficult to uniformly mix the silicone waterproofing composition, which may cause a problem in that the physical properties of the waterproofing layer 110 are poor.

The silicone oil is a component added to facilitate mixing of the silicone polymer with the filler and other components. can be obtained together.

The silicone oil may be included in an amount of 10 to 24% by weight in the main ingredient, and when it is included in less than 10% by weight, it is difficult to obtain effects such as improved mixing properties and improved stability, and when it is included in more than 24% by weight, physical properties Since the content of the silicone polymer or filler that expresses the decrease may cause a problem in which the physical properties of the waterproof layer 110 are deteriorated, it is preferable to be included within the above-described weight range.

As the silicone oil, silicone-based process oil and organosilazane may be used without limitation. Specifically, for example, dimethyl silicone oil, methylphenylsiloxane, diphenylsiloxane, hexamethyldisilazane, 1,4-divinyltetramethyldisilazane, etc. may be used, but is not limited thereto.

In this case, in consideration of volatility and processability, the silicone oil preferably having a viscosity of 3 to 700 cps at 25° C. may be used.

The filler is a particulate material added to improve the strength of the waterproof layer 110 and secure dimensional stability, and may be included in 35 to 62% by weight in the main agent, and when included in less than 35% by weight, strength improvement, dimension The effect of securing stability is insignificant, and when it exceeds 62% by weight, the content of the non-adhesive filler is excessive, and the content of the silicone polymer that exhibits the relative adhesion is insufficient, so the adhesive strength and waterproofness of the silicone waterproof composition are lowered. Therefore, it is preferable to be included within the above-described weight range.

The filler is selected from the group consisting of alumina, aluminum hydroxide, magnesium hydroxide, calcium carbonate, magnesium carbonate, calcium silicate, magnesium silicate, calcium oxide, magnesium oxide, aluminum oxide, aluminum nitride, silica, boron nitride, titanium dioxide and glass. At least any one or more may be used.

Preferably, calcium carbonate is used as a filler for sufficient strength formation and color expression by the pigment when the pigment is added.

These fillers preferably have an average particle size range of 0.5 to 50 μm. When the particle size of the filler is less than 0.5 μm, the particle size is excessively small, so that they are not uniformly dispersed in the main body and aggregated with each other, so the physical properties of the waterproof layer 110 There is a problem of this lowering, and when it exceeds 50 μm, the particle size of the filler is excessively large, so that a sufficient adhesive force is not formed in the silicone waterproof composition and problems such as detachment of the particles may occur, so the above-mentioned average particle size range It is preferable to use a filler having

The solvent is a component added to uniformly mix each component included in the main agent and to increase compatibility by lowering the viscosity of the main agent. An organic solvent may be used as the solvent, preferably acetone, a solvent exempt from regulation of volatile organic compounds. , dimethyl carbonate, t-butyl acetate, etc. may be used.

Among them, in the case of acetone and dimethyl carbonate, t-butyl acetate, which has relatively low volatility as a solvent, and can secure working time, is used as a solvent because it has a problem of deterioration of workability because drying proceeds too quickly during operation due to strong volatility. It is more preferable to use

The solvent may be included in an amount of 5 to 12% by weight in the main agent, and when it is included in less than 5% by weight, it is difficult to secure compatibility, and when it exceeds 12% by weight, the flowability is excessively increased to form a coating film having a predetermined thickness This is difficult and there is a problem in that the content of the nonvolatile matter is relatively reduced, so it is preferable to be included within the above-mentioned weight range.

The additive is a material added to improve the workability and physical properties of the silicone waterproofing composition, and as an additive, at least one selected from the group consisting of an antifoaming agent, a dispersing agent, a fragrance, and a pigment may be used, and the additive may be 0.01 within the entire subject matter. -2.2% by weight.

The antifoaming agent is a component added to remove bubbles generated when the main agent is prepared or when the main agent and the curing agent are mixed. When using a silicone-based antifoaming agent participates in the curing reaction, since the performance of removing air bubbles is reduced, preferably a non-silicone-based antifoaming agent can be used.

The dispersant is a component added to uniformly disperse various components included in the main or silicone waterproofing composition, and any known dispersant may be used without particular limitation. For example, an acryl-based dispersant, a urethane-based dispersant, a polycarbonate-based dispersant, a polyester-based dispersant, and a polyolefin-based dispersant may be used, but is not limited thereto.

The fragrance is a component added to suppress the characteristic odor of the silicone waterproofing composition, and various commonly used fragrances or aromatic substances may be used.

The pigment is a component added to impart color to the silicone waterproofing composition, for example, lead chromate, titanium dioxide, calcium carbonate, barium sulfate, aluminum silicate, talc, graphite, carbon black, iron oxide green, iron oxide red and metal oxide. Or a filler coated with them may be used, but is not limited thereto.

The subject may further comprise 0.5 to 1.2% by weight of the function improving agent.

The function-improving agent is a component added to improve the tensile strength of the silicone waterproofing composition, and the function-improving agent used in the present invention may be Hesperetin laurate.

When the function-improving agent is included in an amount of less than 0.5% by weight, the effect of improving the tensile strength is not obtained, and when it exceeds 1.2% by weight, there is a problem in that the adhesive strength is lowered to inhibit the waterproofness of the waterproof layer 110, so the above-mentioned weight It is preferable to be included within the range.

The curing agent is a component that improves physical properties and causes curing by reacting with the silicone polymer contained in the main material, and includes 65 to 80% by weight of a crosslinking agent, 19 to 34% by weight of a silane compound, and 0.05 to 1% by weight of a catalyst.

The crosslinking agent is a component added to cure the silicone polymer and improve physical properties, and may be included in the curing agent in an amount of 65 to 80% by weight. In order to control the curing rate and secure the physical properties of the coating film, it is difficult to secure excellent physical properties after curing due to a decrease in the degree of crosslinking. It is preferably included within the above-mentioned weight range.

As the crosslinking agent, an isocyanate-based compound, an aziridine-based compound, an epoxy-based compound, or a metal chelate-based compound may be used, but is not limited thereto.

The silane compound is a component added to improve the adhesiveness of the silicone polymer by reacting with the silicone polymer, and may be included in the curing agent in an amount of 19 to 34% by weight, and when it is included in less than 19% by weight, a sufficient adhesive improvement effect is obtained. It is difficult to obtain, and when it is contained in excess of 34 wt%, the viscosity characteristics are lowered and voids can be generated in the coating film, and it is a cause of lowering physical properties such as tensile strength, so it is preferable to be included within the above-mentioned weight range. do.

As the silane compound, for example, vinyltriethoxysilane, 3-glycidoxy propyltrimethoxysilane, 3-glycidoxy propyltriethoxysilane, 3-methacryloxypropyl trimethoxysilane, 3-methacryl Oxypropyl triethoxysilane, 3-acryloxypropyl trimethoxysilane, N-2-(aminoethyl)-3-aminopropyltrimethoxysilane, N-2-(aminoethyl)-3-aminopropyltrie Toxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-ureide propyltriethoxysilane, 3-chloropropyltriethoxysilane, 3-mercaptopropyl trimethoxysilane or 3-isocyanate propyltriethoxysilane may be used, but is not limited thereto.

The catalyst is a component added to promote the reaction of the silicone polymer with the crosslinking agent and the silane compound, and may be included in an amount of 0.05 to 1% by weight in the curing agent. It is preferable to be included within the above-mentioned weight range because the problem of falling off or deterioration of the physical properties of the coating film after curing due to the surplus catalyst occurs.

As such a catalyst, various known catalyst materials may be used, and a platinum catalyst or a tin catalyst may be preferably used. As the tin catalyst, for example, tin octosan, dibutyltin dilaurate or dioctyltin dilaurate may be used.

Another embodiment of the present invention relates to a waterproof construction method of constructing a double composite waterproofing sheet 100 according to an embodiment of the present invention.

Double composite waterproof construction method according to another embodiment of the present invention, a pre-treatment step of removing and planarizing foreign substances on the construction target surface; A primer application step of forming a primer layer by applying a primer to the construction target surface that has undergone the pretreatment step; A waterproofing layer forming step of forming a waterproofing layer 110 by applying a silicone waterproofing composition to the surface to which the primer is applied; and an upper sheet installation step of installing the upper sheet 120 on the waterproof layer.

The pretreatment step is a step of removing and planarizing foreign substances on the construction target surface of the structure (F). In this step, a chipping process may be further performed to improve adhesion with the primer layer (P).

The primer application step is a step of applying a primer to the construction target surface to improve the adhesion between the construction target surface and the double composite waterproof sheet 100, and to prevent moisture from permeating into the interior through the surface of the structure (F) am.

In this case, an acrylic primer, an epoxy-based primer, or a urethane-based primer may be used as the primer.

The waterproofing layer forming step is a step of forming the waterproofing layer 110 by applying a silicone waterproofing composition to the construction target surface to which the primer is applied.

The upper sheet installation step is a step of installing the upper sheet 120 on the waterproof layer 110 , and the nonwoven fabric layer 121 and the waterproof layer 110 of the upper sheet 120 are installed to face each other, and the waterproof layer 110 . It can be installed at the same time or later with a predetermined time difference.

The upper sheet 120 is installed before the waterproof layer 110 is completely cured, and the uncured silicone waterproof composition penetrates into the non-woven fabric layer 121 and then is cured to form the waterproof layer 110 . Accordingly, a stronger bonding force may be formed between the waterproof layer 110 and the upper sheet 120 .

Hereinafter, specific actions and effects of the present invention will be described through an embodiment of the present invention. However, this is presented as a preferred example of the present invention, and the scope of the present invention is not limited according to the embodiments.

[ manufacturing example ]

subject manufacturing

First, the silicone oil, dimethyl silicone oil, and the solvent, t-butyl acetate, are stirred and mixed, and the silicone polymer is slowly added while stirring to prepare a uniform dispersion, and then the additives such as antifoaming agent, dispersing agent, pigment and fragrance are added. Then, calcium carbonate powder (average particle size of 1 to 25 μm) as a filler was added and dispersed by high-speed stirring to prepare a main agent having the composition shown in Table 1 below.

As the silicone polymer, polydimethylsiloxane capped with hydroxyl groups at both ends was used. In this case, the first silicone polymer having a number average molecular weight of about 20,000 g/mol and the second silicone polymer having 80,000 g/mol were 1 : A mixture was used in a weight ratio of 0.4.

Non-silicone-based antifoaming agent BYK-A535 was used as an additive antifoaming agent, monaural M-500 was used as a dispersing agent, and carbon black pigment was used as a pigment.

ingredient content (wt%) silicone polymer 25.700 silicone oil 15.085 filler 50.250 menstruum 8.215 antifoam 0.315 dispersant 0.225 pigment 0.205 air freshener 0.005 Sum 100.000

hardener manufacturing

First, an isocyanate-based crosslinking agent (D-90, Soken Chemical) and a silane compound, XIAMETER™ OFS-6020, were mixed and uniformly stirred, and then a catalyst was added while stirring continuously, and 74.65 wt% of a crosslinking agent, 25.28 wt% of a silane compound, and A curing agent having a composition of 0.07 wt% of dibutyltin dilaurate as a catalyst was prepared.

Silicone waterproofing composition manufacturing

The silicone waterproofing composition of Example 1 was prepared by mixing the main agent and the curing agent so that the weight ratio of the previously prepared main material and the curing agent was 100: 1.25.

[ Experimental example One]

Tensile strength, elongation at break, tensile strength, tear strength, heat stretchability, and adhesion performance of the silicone waterproofing composition of Example 1 prepared through the Preparation Example were measured in accordance with KS F 3211, and the results are shown in Table 2 described. As shown in Table 2, it can be seen that the silicone waterproofing composition according to this embodiment exhibits excellent physical properties.

Example 1 Tensile strength (N/mm ² ) 1.2 Elongation at break (%) 268 Permanent length (N/mm) 175.8 Tear strength (N/mm) 4.1 Heat elasticity (%) -1 to 1 Adhesion performance (N/mm ² ) 0.6

[ Experimental example 2]

A silicone waterproofing composition was prepared using the same method as in Preparation Example, but the weight ratio of the first silicone polymer and the second silicone polymer used was changed as shown in Table 3 below, and then the tensile strength of each silicone waterproofing composition, Elongation at break and adhesion performance were measured, and the results are shown in Table 3.

At this time, in Table 1, the content of each of the first silicone polymer and the second silicone polymer means the weight ratio of each silicone polymer in the entire subject, and Sample 4 is the silicone waterproofing composition of Example 1.

silicone polymer content Experiment result A: first silicone
Polymer (wt%) B: second silicone
Polymer (wt%) B/A
(weight ratio) The tensile strength
(N/mm ² ) elongation at break
(%) adhesion performance
(N/mm ² ) sample 1 25.7 - - 0.6 152 0.3 sample 2 21.0 4.7 0.23 0.8 183 0.3 sample 3 20.2 5.5 0.27 1.1 249 0.6 sample 4 18.2 7.5 0.41 1.2 268 0.6 sample 5 16.9 8.8 0.52 1.4 251 0.6 sample 6 15.9 9.8 0.62 1.3 255 0.6 sample 7 15.3 10.4 0.68 0.7 168 0.6 sample 8 - 25.7 - 0.7 143 0.6

Looking at the experimental results of Table 3, it was confirmed that Samples 3 to 6 had significantly superior tensile strength and elongation at break compared to other samples, thereby showing excellent coating film properties. In particular, looking at the experimental results of Samples 1 to 3 together, , it can be seen that in the case of Sample 3, the overall physical properties are significantly superior to those of Sample 1 or Sample 2.

In addition, looking at the experimental results of Samples 6 to 8, all three types of samples showed the same adhesion performance, but it was confirmed that the tensile strength and elongation at break of Sample 6 were remarkably high.

Therefore, from the above experimental results, as a silicone polymer used as the subject of the silicone waterproofing composition, the first silicone polymer having a relatively low molecular weight number average molecular weight of 15,000 to 25,000 g/mol and a relatively high molecular weight number average molecular weight 70,000 to 90,000 g/ It was confirmed that when mol of the second silicone polymer was used together, the effect of improving tensile strength, elongation at break and adhesion performance could be obtained.

In particular, it was confirmed that when the first silicone polymer and the second silicone polymer were used in a weight ratio of 1: 0.25 to 0.65, the effect of improving the physical properties was more pronounced.

[ Experimental example 3]

A silicone waterproofing composition was prepared using the same method as in Preparation Example, but by further adding hesperetin laurate, a function improving agent, to the subject of Example 1 to prepare a silicone waterproofing composition, and tensile strength and adhesion of each composition The performance was measured and the results are shown in Table 4.

Subject content (wt%) Experiment result Subject of Example 1 function enhancer The tensile strength
(N/mm ² ) elongation at break
(%) adhesion performance
(N/mm ² ) Example 1 100.0 0 1.2 268 0.6 Example 2 99.7 0.3 1.3 260 0.6 Example 3 99.3 0.7 1.8 252 0.7 Example 4 99.0 1.0 1.9 248 0.8 Example 5 98.5 1.5 1.4 157 0.7

Looking at the experimental results in Table 4, it can be confirmed that the function improving effect appears when the function enhancing agent is added. This is considered to be a result of the functional improver increasing the degree of crosslinking during curing of the silicone polymer to form a more dense network structure. In particular, when the function improving agent is included in an amount of 0.5 wt% or more in the main agent, the tensile strength is remarkably improved and the adhesion performance is improved. It can be confirmed that this is improved, but when it is included in an amount exceeding 1.2 wt%, the tensile strength and elongation at break are rather reduced.

Therefore, it could be confirmed that, when preparing the silicone waterproofing composition of the present invention, the function-improving agent is further included in the main subject, but preferably contained in 0.5 to 1.2% by weight in the main subject.

The present invention is not limited to the specific embodiments and descriptions described above, and without departing from the gist of the present invention claimed in the claims, anyone with ordinary skill in the art to which the invention pertains can implement various modifications and such modifications shall fall within the protection scope of the present invention.

100: double composite waterproof sheet 110: waterproof layer
120: upper sheet 121: non-woven fabric layer
122: asphalt layer 123: protective film layer

Claims (7)

a waterproofing layer 110 comprising a silicone waterproofing composition; and
Including; the upper sheet 120 laminated on the upper portion of the waterproof layer (110);
The upper sheet 120, a nonwoven fabric layer 121, an asphalt layer 122 and a protective film layer 123 are sequentially stacked,
The silicone waterproofing composition is mixed in an amount of 1 to 5 parts by weight of a curing agent including a silane compound based on 100 parts by weight of the main agent containing the silicone polymer,
The subject contains 18-35% by weight of silicone polymer, 10-24% by weight of silicone oil, 35-62% by weight of filler, 5-12% by weight of solvent and 0.01-2.2% by weight of additives,
The silicone polymer, a first silicone polymer having a number average molecular weight of 15,000 to 25,000 g/mol; and a second silicone polymer having a number average molecular weight of 70,000 to 90,000 g/mol; are mixed in a weight ratio of 1:0.25 to 0.65, characterized in that which, double composite waterproof sheet. delete delete According to claim 1, wherein the additive,
A double composite waterproofing sheet comprising at least one selected from the group consisting of an antifoaming agent, a dispersing agent, a fragrance and a pigment. delete According to claim 1, wherein the curing agent,
65-80 wt% of a crosslinking agent, 19-34 wt% of a silane compound, and 0.05-1 wt% of a catalyst, a double composite waterproof sheet. In the waterproof construction method of constructing the double composite waterproofing sheet according to any one of claims 1, 4 and 6,
A pre-treatment step of removing and leveling foreign substances on the construction target surface;
a primer application step of forming a primer layer by applying a primer to the construction target surface that has undergone the pretreatment step;
A waterproofing layer forming step of forming a waterproofing layer 110 by applying a silicone waterproofing composition to the surface to which the primer is applied; and
Including; a top sheet installation step of installing the top sheet 120 on the waterproof layer 110,
The waterproof layer 110 includes a silicone waterproof composition,
The silicone waterproofing composition is mixed in an amount of 1 to 5 parts by weight of a curing agent including a silane compound based on 100 parts by weight of the main agent containing the silicone polymer,
The subject contains 18-35% by weight of silicone polymer, 10-24% by weight of silicone oil, 35-62% by weight of filler, 5-12% by weight of solvent and 0.01-2.2% by weight of additives,
The silicone polymer is a first silicone polymer having a number average molecular weight of 15,000 to 25,000 g/mol; and a second silicone polymer having a number average molecular weight of 70,000 to 90,000 g/mol; characterized in that it is mixed in a weight ratio of 1:0.25 to 0.65. , a double composite waterproofing construction method.

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