KR101876806B1 - Waterproofing method using polyurea - Google Patents

Abstract

The present invention relates to a waterproofing method using ultra-rapid curing polyurea. More specifically, the method comprises the steps of: polishing a base surface; applying a primer to the polished base surface; and applying a polyurea-based intermediate coat to the primer. The polyurea-based intermediate coat is prepared by mixing a main agent including a prepolymer having an isocyanate group at a terminal thereof, oxy dipropyl dibenzoate, and a non-phthalate plasticizer with a curing agent including polyaspartate, a chain extender, and non-phthalate plasticizer at a volume ratio of 1:0.5 to 1:1.5. According to the present invention, pinholes can be prevented from occurring without use of a separate base conditioning agent, and waterproof coating having excellent smoothness can be provided. In addition, since non-solvent polyurea is used for construction, an endocrine-disruptor is not produced and rapid curing makes construction ready and easy.

Description

[0001] WATERPROOFING METHOD USING POLYUREA [0002]

More particularly, the present invention relates to a method of waterproofing a base surface by using a polyurea having a high initial speed that does not generate pinholes, has excellent surface smoothness, and does not contain a volatile organic compound .

Concrete is a porous construction material having small capillary voids of 10 nm to 10 탆 in size from large bubbles having a diameter of 0.1 to 50 mm. In addition, there are numerous fine cracks of 0.3 mm or less in width generated by drying and shrinking under an external environment. Since such pores and cracks may become a pathway for penetrating external moisture and deterioration materials, the durability of the concrete structure may be deteriorated. Therefore, in order to secure long-term durability, a waterproof and deterioration inhibiting material is applied to the surface of the concrete, It is required to prevent penetration of deteriorated substances and the like into the furnace.

In order to solve the above-mentioned problems, the presently proposed waterproofing method is to construct the roof and outer wall of a building using polyurea resin as a waterproof coating material.

The polyurea resin is excellent in mechanical, physical and chemical properties such as durability, acid resistance, alkali resistance, chemical resistance, stretchability, waterproofness and the like, and is excellent in adhesive strength. It is excellent in applicability and has the advantage of having quick speed. Prior art regarding waterproofing using such a polyurea resin is Korean Patent No. 10-884015, No. 10-947460, No. 10-408010, and the like.

However, the method using the polyurea resin has excellent waterproof performance. However, when the polyurea resin is directly sprayed on the concrete, the water tightness with the concrete is not good and pinholes are generated and the surface is not flat.

As a method proposed to prevent the problems of the pinholes and the like, there is a method in which a base member is packed using a separate nonwoven fabric or an asphalt sheet before applying the polyurea resin, and then a polyurea resin is applied thereon to form pinholes However, there is a problem that the process of packaging the base member with the nonwoven fabric or the asphalt sheet is cumbersome, and there is a problem that the walking feeling is not good due to the nonwoven fabric or the asphalt sheet when the roof of the building is waterproofed.

Therefore, recently, a method of applying a polyurea resin after applying a base adjusting agent on a base surface of a concrete structure has been proposed. That is, the base adjusting agent is applied to smoothly repair and fill the underside surface, which has uneven holes or holes such as pin holes and recessed grooves, and then the polyurea resin is applied. Such prior art is Korean Patent No. 10-922850.

However, in any of the prior art documents, there is no occurrence of pinholes using only polyurea resin and no waterproofing method in which the surface is flattened.

KR 10-0884015 B1 KR 10-0947460 B1 KR 10-0408010 B1

Accordingly, it is an object of the present invention to provide a polyurea waterproofing method which is free from pinholes and has excellent surface smoothness.

The present invention also provides a polyurea waterproofing method which is excellent in waterproofing, corrosion resistance, chemical resistance, thermal stability, abrasion resistance and weatherability as well as elongation, chemical resistance, acid resistance, alkali resistance, adhesion strength and tensile strength.

In order to accomplish the above object, the present invention provides a polyurea waterproofing method comprising the steps of arranging a base surface, applying a primer to the base surface, and applying a polyurea intermediate to the primer Wherein the polyurea-based midium is selected from the group consisting of a subject comprising an isocyanate-terminated prepolymer, oxydipropyl dibenzoate and a non-phthalate plasticizer, and a curing agent comprising a polyaspartate, a chain extender and a non- 1: 0.5 to 1.5 volume ratio.

The moderate theme is characterized by further comprising graphene and alkoxysilane.

The method of claim 1, further comprising the step of applying a polyurethane-based topcoat to the midway after the step of applying the intermediate coat, wherein the polyurethane-based topcoat is a two-part type of a topcoat and a curing agent, And a ceramic ball having a particle size of 5 to 100 nm.

Wherein the base adjusting agent is a mixture of a water-soluble epoxy resin, cement, and silica in a weight ratio of 1: 2 to 3: 7 to 8, and further comprising the step of applying a base adjusting agent to the primer after the step of applying the primer. do.

According to the present invention, it is possible to provide a waterproof coating film free from pinholes and excellent in smoothness without using a separate background adjusting agent. In addition, there is an advantage that no environment hormone is generated by the construction using the polyurea of the no-dosage form, and the construction is easy since the cure time is fast.

1 is a flowchart showing a method of applying a ultra rapid polyurea according to the present invention

Has been used in the waterproofing method due to the ultra-quick hardness of polyurea resin, excellent waterproofing, anticorrosive property and ease of installation.

However, such a polyurea resin has a problem that pinholes are generated because the water tightness with concrete is not good, and the surface is not flat.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in an effort to solve such disadvantages, and it is an object of the present invention to provide a method for preparing a primer, comprising the steps of arranging a base surface, applying a primer to the base surface, and applying a polyurea intermediate to the primer, The polyurea-based modifier is a mixture of a subject comprising an isocyanate-terminated prepolymer, oxydipropyl dibenzoate and a non-phthalate plasticizer, and a curing agent comprising a polyaspartate, a chain extender and a non-phthalate plasticizer in a ratio of 1: 0.5 to 1.5 By volume ratio.

First, the intermediate polyurea system used in the present invention will be described.

The polyurea-based intermediate has a feature of being excellent in water resistance, chemical resistance, thermal stability, abrasion resistance, weather resistance, elongation, chemical resistance, acid resistance, alkali resistance, adhesion strength and tensile strength. Particularly, the polyurea-based intermediate has a feature that pinhole is not generated and an excellent smoothness is obtained even if a separate background regulating agent is not used.

The mid-level according to the present invention is a non-solvent formulation comprising a topical and a curing agent.

The subject matter includes an isocyanate-terminated prepolymer, oxydipropyl dibenzoate, and a non-phthalate-based plasticizer, wherein the curing agent comprises a polyaspartate, a chain extender and a non-phthalate plasticizer, To 1.5 parts by volume, and most preferably in a volume ratio of 1: 1.

The isocyanate-terminated prepolymer constituting the above-mentioned subject is a main material for determining the mechanical properties of the waterproof coating film. The number of terminal isocyanate functional groups is 2 to 4, the weight average molecular weight is 300 to 6,000, the equivalent is 100 To 2,000 g / eq. Illustratively, in the present invention, 30 to 60% by weight of propylene glycol, 20 to 35% by weight of methylene diphenyl diisocyanate and 20 to 35% by weight of modifier methylene diisocyanate may be reacted in the preparation of the isocyanate-terminated prepolymer , But does not limit it. When the content of the isocyanate-terminated prepolymer is in the range of 80 to 95% by weight in the composition, if the content is less than 80% by weight, physical properties such as tensile strength and elongation of the coating film are weakened, This is because the viscosity is too high to use.

The oxydipropyl dibenzoate prevents oxidization and discoloration of the coating film and is contained in the range of 1 to 10% by weight in the base. When the content is less than 1% by weight, the effect of preventing oxidation and discoloration is insignificant, If it exceeds 10% by weight, the physical properties of the coating film may be lowered.

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The plasticizer is intended to impart appropriate flexibility and fluidity to the isocyanate-terminated prepolymer and impart flexibility to the coating film. The plasticizer is a non-phthalate plasticizer that is an environmentally friendly plasticizer. Specifically, the plasticizer is a single plasticizer selected from the group consisting of C8-C20 alcoholic, ester, carboxylate, aliphatic and benzoate plasticizers, Examples of the nonphthalate ester plasticizers include phosphate ester plasticizers, polyester plasticizers, tetrabromophthalic acid bis esters, alkylaryl phosphate esters and the like, and the nonphthalate-based carboxylate plasticizers Examples of the nonphthalate-based benzoate plasticizer include benzoate ester plasticizers such as Benzoflex® and the like. Examples of the nonphthalate-based benzoate plasticizers include benzoic acid esters, Including but not limited to It is not. The plasticizer may be included in the range of 0.5 to 3 wt% in the subject.

In addition, the above-mentioned subject may further include a pigment, and the pigment is not limited in its kind as long as it is usually used in a medium, and may be included in the range of 0.5 to 1% by weight in the subject.

The polyaspartate of the curing agent is used for reaction with a prepolymer in a subject and may be prepared from a mixture of polyamines and polyetheramines. The polyaspartate may be contained in a range of 55 to 78 wt% in the curing agent.

The chain extender increases the degree of bonding of the respective components to provide excellent physical properties such as abrasion resistance and hardness. More specifically, it may be dimethylthio-toluene diamine and butadiol. The dimethylthiotoluenediamine and butadiol may be contained in a range of 20 to 30% by weight of dimethylthiotoluenediamine in the curing agent and 1 to 10% by weight of butadiol.

Further, the plasticizer is for imparting flexibility to the coating film, and a non-phthalate plasticizer can be used in the same manner as the subject. The plasticizer may be contained in a range of 0.5 to 3% by weight in the curing agent.

In addition, the curing agent may further comprise an ultraviolet stabilizer, and specifically, 0.5 to 2% by weight of N- (4-ethoxycarbonylphenyl) -N'-methyl-N'-phenylformamidine in the curing agent . ≪ / RTI >

The above medium-speed polyurea-based intermediate layer having the above-described structure is a 100% solid content, and is not only environmentally friendly because it does not use a solvent or a diluent but also exhibits excellent waterproofness, chemical resistance, thermal stability, abrasion resistance, weather resistance, , Alkali resistance, adhesion strength and tensile strength. In addition, since the polyurea-based medium can be sprayed at a volume ratio of 1: 1, it is advantageous in terms of ease of installation.

On the other hand, the moderate subject may further include graphene and alkoxysilane. The graphene refers to a monolayer separated from graphite having a lamellar structure stacked in the hundreds of thousands to millions or more by a van der Waals force or the like, Of graphite or several to several tens of layers of graphite (pseudogranite).

The single-layer graphene separated from the graphite has a very high physical and chemical stability. The strength of the graphene is about 200 times higher than that of steel, and the thermal conductivity is about two times higher than that of diamond. And has excellent physical properties as a porous structure waterproof material breathing to prevent access. Therefore, when a waterproofing agent is produced using such graphene, it is possible to produce a product excellent in water resistance, abrasion resistance, durability, stain resistance and the like, to prevent pinholes from being generated, and to secure surface flatness. The graphene may be included in the range of 1 to 5 wt% in the base.

The alkoxysilane improves the adhesion to the substrate, and may be included in the range of 1 to 5 wt% in the base.

Hereinafter, a method of waterproofing a base surface using the above-described polyurethane-based medium will be described in detail with reference to FIG. 1 attached hereto.

The waterproofing method according to the present invention comprises the steps of arranging a base surface, applying a primer to the surface to be cleaned, and applying a polyurea intermediate to the primer.

The substrate surface  Steps to organize.

First, we lay the base surface.

The cleanup of the base surface includes cleaning the surface of the concrete to be applied and removing the concrete Ash, latens, oil, and other foreign matter adhered to or remaining on the concrete surface. In addition, when moisture is present, it may be completely dried, the irregular portion may be changed into a grinder and smoothed, and the cracked portion may include an operation of glazing with a suitable material.

The acid washing may be carried out by wetting the surface of the concrete with tap water using a water jelly or the like so that the water does not float, Lt; 2 > / m < 2 >. The sprayed acid solution reacts violently with the concrete for about 4 to 6 minutes, and can continue rubbing with the brush during the reaction. After 10 to 15 minutes after the application of the acid solution, rinse with high-pressure water to remove the residue and the acid solution.

After the acid solution is removed as required, 3 to 6% of an alkaline solution such as NH ₄ OH is sprayed on the surface in an amount of 0.3 to 0.5 L / m 2 and left for about 5 to 15 minutes to remove the concrete Neutralized, and washed again.

The above- On the surface Primer  Applying step.

Next, a primer is applied to the above-mentioned ground surface.

Here, the primer is not limited in its kind, and can be applied once or twice, if necessary, and the thickness of the coating film can be 20 to 50 탆. As the primer, for example, an NP primer (manufactured by Seumu Special Construction Co., Ltd.) or the like may be used.

remind On the primer Polyurea series  Applying the midway.

Next, a polyurethane based coating is applied to the primer. At this time, the intermediate application should be performed within 24 hours, most preferably within about 2 hours after application of the primer, to obtain the best adhesive force.

Since the above-mentioned polyurethane-based intermediate has been fully described above, a detailed description thereof will be omitted.

The middle layer is sprayed with a thickness of about 1000 to 2000 탆, and a coating pressure of about 127 to 176 kgf / cm 2 is enough.

The above-mentioned polyurea-based medium is dried in a quick-drying type within 30 seconds, can walk within 30 minutes, and can pass within 60 minutes.

According to the waterproofing method as described above, since the polyurea-based medium of the quick-speed type is used, it can be touched within 30 seconds, can walk within 30 minutes, and can pass within 60 minutes. In addition, it has not only excellent mechanical properties but also pinholes and the like, and also has an advantage of excellent adhesion.

Meanwhile, after the step of applying the intermediate coat, the step of applying the polyurethane based coat may further include the step of applying the polyurethane based coat.

That is, if necessary, the top coat can be further applied to the middle portion. Since the center of gravity is a polyurea system at the initial speed, it is possible to apply a top coat immediately after coating.

At this time, various types of tops as well as the polyurethane system can be used as the topsheet, and the types thereof are not limited.

However, in order to ensure excellent heat resistance, a polyurethane based topcoat composed of a two-component type of a base and a topical agent is used, and a ceramic ball composed of aluminum silicate and having a particle size of 5 to 100 nm Can be applied.

At this time, the coating thickness of the upper surface is not limited, but may be about 20 to 100 탆.

Further, the present invention does not require a separate background adjusting agent. However, in the field where the surface of the base surface is uneven and requires a beautiful surface, for example, a step of applying the primer to a sports facility, industrial facility, water treatment facility, A step of applying a base adjusting agent to the primer may be further carried out.

The base adjusting agent may be a mixture of water-soluble epoxy resin, cement, and silica in a weight ratio of 1: 2 to 3: 7 to 8, but not always limited thereto. Special construction) products can be used.

The waterproofing method according to the present invention can be applied to waterproofing, waterproofing, water tank, septic tank, sewage treatment plant, water treatment plant, sports facility, industrial facility, water treatment facility, as well as construction, civil concrete structure, roof, roof, It is also applicable to treatment plants, wastewater treatment plants, dams, various tanks, offshore structures, bridges, and various sculptures, and its application is not limited.

Hereinafter, specific examples will be described.

(Example 1)

88% by weight of an isocyanate-terminated prepolymer (weight average molecular weight 3000-4000, average number of functional groups 2.5), 5% by weight of oxydipropyl dibenzoate and 2% by weight of a nonphthalate plasticizer (Benzoflex®) were mixed.

A mixture of 67% by weight of polyaspartate, 25% by weight of dimethylsotoluenediamine and 5% by weight of butadiols, 2% by weight of a nonphthalate plasticizer (Benzoflex), N- (4-ethoxycarbonylphenyl) -N'-phenylformamidine was mixed to prepare a curing agent.

Then, the above-mentioned base and the curing agent were mixed in a volume ratio of 1: 1.

(Test Example 1)

The physical properties of the above-described Example 1 were tested to see if it met the criteria of KS F 4922. At that time, the test method for each characteristic was in accordance with KS F 4922.

The results are shown in Table 1 below.

Results of Test Example 1 Test Items
Based on KS F 4922 Example 1 Tensile performance Tensile strength (N / mm 2) 16 or more 19 Elongation at Break (%) 300 or more 412 Tear strength (N / mm) Over 50 69 Temperature dependence Tensile strength ratio (%) -20 ° C 150 or more 151 60 ° C 60 or more 80 Elongation (%) between the seams at break -20 ° C 100 or more 102 20 ℃ 200 or more 219 60 ° C 150 or more 209 After degradation treatment
Tensile performance Tensile strength ratio (%) Alkali treatment 80 to 150 101 Acid treatment 80 to 150 104 Sodium chloride 80 to 150 99 Facilitated exposure treatment 80 to 150 98 Elongation at Break (%) Alkali treatment 250 or more 378 Acid treatment 250 or more 390 Sodium chloride 250 or more 388 Facilitated exposure treatment 250 or more 367 Heat stretching property Elasticity (%) -1.0 to 1.0 -0.7 Deterioration characteristics during elongation Facilitated exposure treatment Cracked residue and
There should be no obvious deformation clear Ozone treatment Cracked residue and
There should be no obvious deformation clear

As can be seen from the above Table 1, Example 1 of the present invention was found to satisfy all the specifications of KS F 492.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments. It will also be appreciated that many modifications and variations will be apparent to those skilled in the art without departing from the scope of the present invention.

Claims (4)

Arranging the base surface,
Applying a primer to the cleaned surface,
Applying a polyurea-based intermediate to the primer,
Wherein said polyurea-based midrange comprises a subject comprising an isocyanate-terminated prepolymer, oxydipropyl dibenzoate and a non-phthalate plasticizer,
Wherein the curing agent comprising polyaspartate, a chain extender and a non-phthalate plasticizer is mixed in a ratio of 1: 0.5 to 1.5.
The method according to claim 1,
Wherein said moderate subject further comprises graphene and alkoxysilane.
3. The method of claim 2,
After the step of applying the intermediate coat,
Further comprising the step of applying a polyurethane based topcoat to said midway,
Wherein the polyurethane-based phase diagram is a two-component type of a base and a curing agent, wherein the base and the curing agent comprise a ceramic ball composed of aluminum silicate and having a particle size of 5 to 100 nm.

The method of claim 3,
After the application of the primer,
Further comprising the step of applying a priming agent to the primer,
Wherein the base adjuster is a mixture of a water-soluble epoxy resin, cement and silica sand at a weight ratio of 1: 2 to 3: 7 to 8.

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