KR20210066173A - Cement waterproofing material using modified composite polymer with excellent waterproofing performance and its manufacturing method - Google Patents

Abstract

The present invention relates to a cement waterproofing material using a modified composite polymer with excellent waterproof performance, which is used at an interface between concrete structures, buildings, wood and the like, and a manufacturing method thereof.

Description

Cement waterproofing material using modified composite polymer with excellent waterproofing performance and its manufacturing method

The present invention relates to a cement waterproofing material using a modified composite polymer having excellent waterproofing performance and a method for manufacturing the same, and in particular, a modified polyvinyl in which a modified PVAc solution based on polyvinyl acetate (PVAc) and polyvinyl butyrol are mixed. By mixing natural rubber latex solution, carbonate compound and inorganic powder material with a polymer-based polymer to produce a cement waterproofing material with strong elasticity, it has excellent oxygen barrier properties, toughness and high elasticity, along with fast curing time during construction, for interfacial adhesion and deterioration of concrete structures. It relates to a cement waterproofing composition using a modified composite polymer having excellent finishing properties and used as a waterproofing agent for surface coating for prevention and surface finishing of concrete, steel frame, wood, etc. for civil and building structures, and a method for manufacturing the same.

In general, the roof of a building requires an excellent waterproofing function to protect against precipitation, a function to reduce the thermal load of solar radiation caused by sunlight, and an insulation function to keep the inside warm, and It requires a function that can handle the load acting on the roof and the roof surface.

In the conventional waterproofing construction, waterproofing methods such as asphalt waterproofing, cement liquid waterproofing, synthetic polymer waterproofing, and various waterproofing materials are used depending on the waterproofing part and the material and use of the existing matrix.

In general, materials for adhesive and waterproof performance used in buildings are very diverse. The most representative part that requires both adhesive performance and waterproof performance is the place that requires a waterproof function. The waterproofing function is used in various parts of the building, but the most representative use among them is the outer wall, the roof, and the underground structure. Materials used for these parts are very diverse, such as organic materials, inorganic materials, and organic-inorganic composites.

Among these materials, cement-based materials are the most representative materials for inorganic materials, but these inorganic materials are very advantageous in terms of adhesive strength, etc. have. As organic materials, urethane and epoxy are mainly used. These materials are very advantageous in adhesive strength, waterproof performance, and securing working time, but they are expensive, and there are problems such as deterioration of working environment conditions due to volatile organic substances during work. there is this Moreover, as these materials are organic materials, construction defects are frequently occurring as heterogeneous materials because most of the buildings are made of concrete with cement as the main raw material. That is, due to the release of moisture contained in concrete, these organic materials have defects such as peeling, partial loss, and formation of air pockets.

In order to overcome the shortcomings of these organic materials and inorganic materials, inorganic-organic materials as cement-based materials using polymer emulsions have been developed and used in various ways due to their various complex functions.

However, since these materials are cement-based materials, they have the disadvantage that it takes a long time to harden the cement. Also, since the film created by the hydration of the cement material and the polymer emulsion provides waterproofing performance, in reality, cement is used as the main raw material. It has a slightly better waterproof performance than an inorganic material, but has a weaker waterproof performance than an organic material.

On the other hand, in the conventional roof waterproofing method, a waterproofing sheet is installed on the upper surface of the floor layer, a double-sided tape is taped to the overlapping portion of the waterproofing sheet or heat-sealed by heat, and a coating film waterproofing agent is applied and cured on the surface of the sheet to form a coating film waterproofing layer. After that, it consists of pouring waterproof coating material or pouring protective pressing concrete on the surface again.

The general waterproof construction method had the following problems.

First, a waterproof sheet and a waterproof sheet are adhered to the waterproofing of the base layer, but the adhesive part between the sheets is damaged or peeled off due to damage or lifting.

Second, a waterproof coating film is installed on the upper part of the waterproof sheet and the protective concrete is poured again, but when the temperature of the protective pressed concrete layer rises due to sunlight, heat is transferred to the lower part, so the top layer of concrete, waterproofing film, waterproof sheet, and base layer Since the coefficient of thermal expansion of each layer made of concrete is different, the waterproofing layer of the coating film is easily damaged and deteriorated, and dew condensation occurs between the sheet and the base concrete, thereby destroying the waterproof structure due to the formation of air pockets.

In addition, in the case of the roof of a building, the connection part between the base layer and the wall or the connection part with the base layer due to the installation location of various facilities is the part where the most construction defects occur in the case of the existing waterproofing system.

" 나 "

"과 같은 형태를 이루게 되며 이러한 연결부위에는 각종 시트와 시트의 접착이 어렵고, 비록 우레탄이나 에폭시 아스팔트 등 여러가지 고분자 물질로 접착을 시킨다 하더라도 시트층과 콘크리트층, 우레탄이나 에폭시 등의 접착 물질과 콘크리트층 사이에 열팽창 수축의 차이에 의해 발생하는 결로에 의한 습기나 벽체 외부에서 유입되는 습기에 의해 접착된 부위가 탈락, 박리되어 시트층이 파괴되거나 들뜨는 문제점이 많이 발생한다.The connection part between the wall and the base floor or the connection part between the equipment installed on the roof floor and the base floor is "

"I"

In this connection part, it is difficult to adhere various sheets to sheets, and even if they are adhered with various polymer materials such as urethane or epoxy asphalt, the sheet layer and concrete layer, and the adhesive material such as urethane or epoxy and the concrete layer There are many problems in that the adhered part falls off or peels off due to moisture due to condensation caused by the difference in thermal expansion and contraction between the walls or moisture flowing in from the outside of the wall, causing the sheet layer to be destroyed or lifted.

The "Waterproof Construction Method" of Korean Patent Laid-Open Publication No. 10-2005-0029912 partially compensates for the disadvantages of the existing waterproofing method, and includes a top coating to protect the base layer, the sheet layer, the waterproofing film and the waterproofing layer. It is the same as the existing method, but a nail is used to fix the sheet, and a waterproofing agent is used again to compensate for the hole in the nail. This seems to complement the conventional waterproofing method, but there is no preparation for condensation or air pockets that may be caused by the heat on the top, and the adhesion between the concrete and the sheet layer of the lower base layer also has different coefficients of thermal expansion, so peeling and air pockets may be formed. There are downsides to high risk.

In addition, Republic of Korea Patent Publication No. 10-0135675 "Roof insulation waterproofing method and roof insulation waterproofing structure" forms a waterproof layer with urethane on the base layer, forms an insulation layer with on-site foamed urethane again, and then insulates with urethane-based waterproofing paint again A method of forming a protective waterproofing layer and pouring protective pressing concrete on the insulating protective waterproofing layer is disclosed. Although this method can show very good waterproof performance, dew condensation between the base layer and the attached urethane waterproofing layer is caused by the discharge of moisture contained in the base layer concrete by basically applying and attaching the base concrete as a urethane waterproofing layer. There is a disadvantage in that the waterproof layer is damaged again as air pockets are generated due to the vapor pressure caused by the generation of dew condensation.

Republic of Korea Patent Publication No. 10-2005-0029912 "Waterproof construction method" Republic of Korea Patent Publication No. 10-0135675 "Roof insulation waterproof construction method and roof insulation waterproof structure"

Accordingly, the object of the present invention has been devised to solve the above-mentioned problems, and it is possible to improve the adhesion performance, waterproof performance and elasticity of the concrete structure to the base surface and to exhibit followability to cracks in the concrete structure during earthquake occurrence. Polyvinyl acetate is used as a base material to create a crack-following waterproof coating with a function to prevent falling off, and polyvinyl acetate is modified with methyl alcohol to improve water resistance and elastic coating. By mixing a modified composite polymer in which a vinyl acetate compound and polyvinyl butyrol are mixed and a modified natural rubber latex modified with natural rubber latex to improve elasticity, a carbonate compound and silicate powder are mixed to form a waterproof film with strong elasticity. , It is used on the surface of concrete structures to maintain water resistance and durability, so that it is easy to attach materials to materials, and by improving followability to expansion and contraction of concrete structures due to elasticity, crack separation and separation between structures are prevented, A new high-durability and high-water-repellent modified composite polymer that can improve the initial performance of concrete structures and protect the interior and exterior of concrete structures as well as waterproofing by reducing various factors that degrade durability due to vibration, load, and environmental influences An object of the present invention is to provide an organic/inorganic composite elastic coating film waterproofing composition and a method for manufacturing the same.

In order to achieve the above object, the method for manufacturing a cement waterproofing material using the modified composite polymer of the present invention includes the steps of (1) dissolving polyvinyl acetate (PVAc) in methyl alcohol to produce a PVAc solution, (2) the generated PVAc Preparing a modified PVAc solution by adding tetraethyl oxo silicate (TEOS) and hydrochloric acid solution to the solution and mixing, (3) aging the prepared modified PVAc solution at room temperature for 6 hours, (4) the aged Preparing a modified polyvinyl-based polymer by mixing polyvinyl butyrole with a modified PVAc solution, (5) mixing a natural rubber latex solution and a carbonate compound with the modified polyvinyl-based polymer, and the mixture at room temperature for 1 hour to Aging for 5 hours, and (6) mixing silica gel and modified natural rubber latex solution with the aged mixture.

The cement waterproofing material composition using the modified composite polymer of the present invention and its manufacturing method have excellent elasticity, tensile strength, tensile strength, abrasion resistance, etc., and have excellent oxygen barrier properties, toughness and high elasticity, especially for interfacial adhesion of concrete structures, deterioration It is used as a surface coating for prevention and as a waterproofing material for concrete for civil engineering and building structures, and has excellent effects in improving waterproofing performance of concrete structures, improving seismic resistance and preventing deterioration of concrete structures due to its excellent elasticity and waterproofing properties.

In addition, the present invention mixes a water repellent compound cross-linked using polyacrylic acid (PAA) with a PVAc solution modified with vinyltriethoxysilane (VTEOS) in addition to the modified PVAc solution. There is an effect that can be maximized.

1 is a process diagram for explaining a method for preparing an organic/inorganic composite elastic coating film waterproofing agent composition using a modified composite polymer according to the present invention
2 (a) to (c) are views showing the water-repellent performance of the waterproofing composition prepared by the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a process diagram of a method for manufacturing an organic/inorganic composite elastic coating film waterproofing agent composition using a modified composite polymer according to the present invention.

Referring to FIG. 1, in the present invention, polyvinyl acetate (hereinafter referred to as 'PVAc') is dissolved in methyl alcohol to produce a PVAc solution (step 10).

Polyvinyl acetate (PVAc) is a polymer with excellent mechanical and chemical properties, and it is non-toxic and can be used as a clean material.

At this time, 5 to 30 parts by weight of PVAc and 250 to 600 parts by weight of methyl alcohol are dissolved in a range of 20 to 40° C. at a rotation rate of 5 to 50 per minute.

Here, if the amount of methyl alcohol is 250 parts by weight or less, the concentration of PVAc becomes too high and the reaction in the subsequent step is not smooth. If the amount of methyl alcohol is 600 parts by weight or more, the concentration of PVAc is too low, and the formation of an elastic coating film may be weakened. .

Therefore, the amount of methyl alcohol is preferably 300 to 500 parts by weight.

Tetra ethyl ortho silicate (hereinafter referred to as 'TEOS') and hydrochloric acid solution (HCl) were added to the PVAc solution produced in step 10, and then mixed to prepare a modified PVAc solution (step 20).

At this time, 35 to 70 parts by weight of TEOS and 10 to 30 parts by weight of a 0.1 mol hydrochloric acid (HCl) solution are added to 100 parts by weight of the PVAc solution, and then mixed at a rotation speed of 5 to 50 per minute at room temperature.

Here, when the amount of TEOS is 35 parts by weight or less, the water resistance of the resulting coating film is weakened, and when the amount of TEOS is 70 parts by weight or more, silicate crystals may be formed in the solution.

Therefore, the amount of TEOS is preferably 40 to 60 parts by weight.

In addition, if the amount of 0.1 mol hydrochloric acid solution used is 10 parts by weight or less, the binding reaction of TEOS may be weak and the water resistance performance by TEOS may be weakened. If it is more than 30 parts by weight, the modified PVAc solution is destroyed due to excessive addition, thereby preventing the formation of a coating film. can hinder

Therefore, it is preferable to use 15 to 25 parts by weight of the 0.1 mol hydrochloric acid solution.

On the other hand, in order to further maximize the water-repellent property, optionally, 90% of vinyltriethoxysilance (VTEOS) was added to 10% of PVAc solution to obtain a modified PVAc solution, and then polyacrylic acid (PAA) was added thereto. The solution obtained by cross-linking reaction at a constant temperature by using a solution may be mixed with the modified PVAc solution prepared in step 20 (step 25).

That is, according to the process of step 25, by modifying PVAc using VTEOS, a silane compound having excellent hydrophobicity, water resistance and moisture barrier properties on the surface are improved, and at the same time, solubility in water, swelling degree, tensile strength, etc. in water using PAA can complement the physical properties of

* After aging the modified PVAc solution prepared in step 20 or a mixture of the solutions prepared in steps 20 and 25 at room temperature for 6 hours (step 30), polyvinyl butyral is mixed and modified A polyvinyl-based polymer is prepared (step 40).

At this time, 20 to 60 parts by weight of polyvinyl butyrol are mixed with respect to 100 parts by weight of the modified PVAc solution.

Here, when polyvinyl butyrol is mixed in an amount of 20 parts by weight or less, the formation of a coating film by the composite polymer is weakened, and when it is mixed in 60 parts by weight or more, it becomes difficult to create a coating film of a certain thickness due to excessive increase in the viscosity of the solution.

Therefore, the amount of polyvinyl butyrol is preferably 25 to 55 parts by weight.

30 to 70 parts by weight of the modified polyvinyl-based polymer prepared in step 40 and 1 to 10 parts by weight of a carbonate compound are mixed with respect to 100 parts by weight of the natural rubber latex solution (step 50).

Natural rubber latex is a natural rubber latex in which the coagulation of rubber latex is prevented with ammonia water, and a solid content of 30 to 60 parts by weight is used.

The carbonate compound is used to deodorize the ammonia smell of natural rubber latex and prevent gelation of the complex polymer solution. As a water-soluble carbonate, one or two or more selected from potassium carbonate, sodium carbonate, and lithium carbonate is used.

Here, if the amount of the carbonate compound added is 1 part by weight or less, it is difficult to neutralize the ammonia of the natural rubber latex, and the water resistance of the composite polymer coating film is lowered. Occurs.

Therefore, the addition amount of the carbonate compound is preferably 3 to 7 parts by weight.

More preferably, since a carbide such as coffee grounds is added, the deodorizing effect can be enhanced.

The mixture of step 50 is aged at room temperature for 1 hour to 5 hours (step 60), and then mixed with silica gel and modified natural rubber latex solution using a modified composite polymer. It constitutes the liquid part (steps 70 and 80).

At this time, 1 to 10 parts by weight of silica gel having a particle size of 1 to 10 mm is mixed with respect to 100 parts by weight of the mixture, and 30 to 70 parts by weight of the modified natural rubber latex solution is mixed.

Here, when the amount of silica gel is 1 part by weight or less, the water resistance of the coating film by the modified composite polymer solution is reduced, and when it is 10 parts by weight or more, the silica gel is gelled, which causes a problem in long-term storage.

Therefore, 3 to 7 parts by weight of silica gel is preferable.

By mixing 50 parts by weight to 100 parts by weight of a fast-hardening cement mortar generally used for rapid construction with respect to 100 parts by weight of the final solution constituted by the above, oil using a modified composite polymer for an exposure type waterproofing agent composition An inorganic composite elastic coating film waterproofing agent composition is obtained.

In addition, by using a mixture of 50 parts by weight to 100 parts by weight of calcium carbonate with respect to 100 parts by weight of the final solution, an organic/inorganic composite elastic coating waterproofing agent composition using the modified composite polymer for a non-exposed coating waterproofing composition is obtained.

In addition, by using a mixture of 50 to 100 parts by weight of ordinary Portland cement with respect to 100 parts by weight of the final solution, an organic/inorganic composite elastic coating waterproofing agent composition using the modified composite polymer for wall coating waterproofing composition is obtained.

Meanwhile, the composition prepared according to the present invention may be mixed with graphene powder having a strength 200 times stronger than steel and excellent elasticity in a predetermined ratio and used to reinforce seismic performance.

As described above, the obtained composition is used as a waterproof finishing material on the surfaces of concrete slabs, steel frames, wood, etc. of rooftop and underground structures of buildings, etc. A waterproof coating film construction of applying the coating film waterproofing agent prepared by the present invention above is carried out.

(A) to (C) of FIG. 2 are views comparing the water repellency performance of the waterproofing composition prepared according to the present invention. (A) is a case of using an unmodified PVAc solution, and (B) is a case of using VTEOS. Thus, PVAc-modified solution was used, and (c) shows a case where PVAc modified using VTEOS was cross-linked using PAA.

After the waterproof coating construction was carried out, the contact angle with respect to water (A) was 58.6°, (B) was 121.6°, and (C) was 140.7°. Compared to A) and (B), the contact angle is large, so that the surface does not get wet with water, so it has a so-called 'lotus leaf effect'.

Therefore, it can be seen that the composition prepared by the present invention is remarkably excellent in water-repellent performance.

Claims (1)

(1) dissolving polyvinyl acetate (PVAc) in methyl alcohol to produce a PVAc solution;
(2) preparing a modified PVAc solution by adding tetraethyl oxo silicate (TEOS) and hydrochloric acid solution to the generated PVAc solution, followed by mixing;
(3) aging the prepared modified PVAc solution at room temperature for 6 hours;
(4) preparing a modified polyvinyl-based polymer by mixing polyvinyl butyrol with the aged modified PVAc solution;
(5) mixing a natural rubber latex solution and a carbonate compound with the modified polyvinyl-based polymer, and aging the mixture at room temperature for 1 hour to 5 hours; and
(6) mixing silica gel and modified natural rubber latex solution with the aged mixture,
In step (6), 1 to 10 parts by weight of silica gel having a particle size of 1 to 10 mm is mixed with respect to 100 parts by weight of the mixture of step (5), and 30 to 70 parts by weight of a modified natural rubber latex solution is mixed. A cement waterproofing material using a modified composite polymer and a method for manufacturing the same.

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