KR102193545B1 - Water proof coating method for the concrete structure using the waterproof composition - Google Patents

Abstract

The present invention relates to a waterproof composition and a method of waterproofing a concrete structure using the same, which are able to add a natural additive to a waterproof painting composition, to keep the strength and durability of the concrete structure, to give flexibility, to reduce the probability of cracks, to include a deodorizing bead including zeolite in the waterproof paint composition, to have excellent deodorization properties and antibacterial properties, to adsorb fine dust and heavy metal, and to prevent atmospheric pollution. According to the present invention, the method of waterproofing the concrete structure using the waterproof composition comprises: a step of organizing a surface of the concrete structure; a step of manufacturing the waterproof composition; a step of applying the waterproof paint composition, which is heated and agitated, on the concrete structure; and a step of applying a fine dust adsorption agent on the concrete structure to which the waterproof paint composition is applied.

Description

Waterproof composition and waterproof coating method for concrete structures using the same {WATER PROOF COATING METHOD FOR THE CONCRETE STRUCTURE USING THE WATERPROOF COMPOSITION}

The present invention relates to a waterproof composition and a waterproof coating method for concrete structures using the same, and more specifically, by adding natural additives to the waterproof coating composition, while maintaining the strength and durability of the concrete structure, it gives flexibility and reduces the possibility of cracking. The waterproof coating composition includes a deodorant bead containing zeolite, has excellent deodorization and antibacterial properties, and can prevent air pollution by adsorbing fine dust and heavy metals, and a waterproof composition and a waterproof coating method for concrete structures using the same. About.

In the case of concrete, which is currently widely used in civil engineering and construction, unlike steel or other materials, it is known that the paint coating does not significantly affect the structure.However, the structure may be damaged due to discoloration or peeling of the concrete paint during structural safety diagnosis or inspection. It was found that it seriously affects not only the corrosion resistance and moisture resistance but also the aesthetic appearance damage.

In particular, in the case of concrete structures, in order to improve weather resistance, corrosion resistance, and chemical resistance, or to form a beautiful surface, they are finished by painting with paint or applying a cement mixture. Organic coating materials made of synthetic resin as the main raw material are mainly used as coating materials, and these organic coating materials lack elasticity depending on the location and temperature change of steel products and concrete structures in contact with the outside air and rust due to cracks and peeling. There is a problem that occurs. In addition, organic coating materials release volatile organic compounds, causing problems such as allergy to the human body and air pollution.

In order to solve this problem, studies have been conducted on inorganic coating materials, but there is a problem that adhesion and rust prevention effect are remarkably low.

Therefore, there is an urgent need to develop an eco-friendly material that can increase the maintenance period by improving the durability of the painting material and improving the adhesion stability with the concrete structure.

Korean Patent Registration No. 10-2000461

The present invention is to meet the above technical problem, and relates to a waterproof composition and a waterproof coating method for a concrete structure using the same, and more specifically, by adding a natural additive to the waterproof coating composition, while maintaining the strength and durability of the concrete structure A waterproof composition that provides flexibility and reduces the possibility of cracking, has excellent deodorization and antibacterial properties including deodorant beads containing zeolite in the waterproof coating composition, and can prevent air pollution by adsorbing fine dust and heavy metals. And it is an object to provide a concrete structure waterproof coating method using the same.

In the configuration of the coating method of the present invention as a means for achieving the above object, the steps of arranging the surface of the concrete structure; Preparing a waterproof coating composition; Applying a heat-stirred waterproof coating composition to the concrete structure; And applying a fine dust adsorbent to the concrete structure to which the waterproof coating composition is applied.

In the configuration of the coating method of the present invention, the step of preparing the waterproof coating composition is heated and stirred until the viscosity of the waterproof coating composition becomes 2000 ~ 4000 cps.

In the configuration of the coating method of the present invention, the step of preparing the waterproof coating composition, based on 100 parts by weight of the total composition, 15 to 18 parts by weight of natural additives, 3 to 5 parts by weight of deodorant beads including zeolite, 3 flame retardants It is prepared including parts by weight.

In the composition of the coating method of the present invention, the natural additive is, based on 100 parts by weight of the total composition, 11 to 18 parts by weight of carob bean gum, 10 to 15 parts by weight of polylactic acid, 8 to 10 parts by weight of butyl acrylate, and evergreen skin 5 parts by weight of the extract and 1 to 3 parts by weight of epoxide soybean oil are included.

In the composition of the coating method of the present invention, the deodorizing bead containing zeolite is completely dissolved by adding 10 to 15 wt% of PVA and 1 to 5 wt% of sodium alginate to 65 to 70 wt% of D/I Water and stirring Step to do; Adding 10 to 15 wt% of zeolite to the dissolved solution and dissolving by stirring; Spray-drying the stirred composition to a size of 300 to 500 μm; Curing the spray-dried composition in an electric furnace for 20 hours; And washing the cured composition using distilled water, and having a diameter of 300 to 500 μm is used.

In the configuration of the coating method of the present invention, the fine dust adsorbent, 55 to 65% by weight of a polysaccharide gel prepared by concentrating seaweed and aloe; 20-25% by weight of titanium oxide; 12-15% by weight of cationic starch; And 3 to 5% by weight of carboxymethylcellulose.

In the composition of the present invention as a means for achieving the above object, based on 100 parts by weight of the total composition, 15 to 18 parts by weight of natural additives, 3 to 5 parts by weight of a deodorant bead containing zeolite, and 3 parts by weight of a flame retardant, The natural additives, based on 100 parts by weight of the total composition, 11 to 18 parts by weight of carob soybean gum, 10 to 15 parts by weight of polylactic acid, 8 to 10 parts by weight of butyl acrylate, 5 parts by weight of evergreen bark extract, epoxide soybean It contains 1 to 3 parts by weight of oil.

The waterproof composition according to the present invention and the waterproof coating method for concrete structures using the same can be applied to the actual construction industry, and natural additives are added to the waterproof coating composition to provide flexibility while maintaining the strength and durability of the concrete structure and reduce the possibility of cracking. The waterproof coating composition includes a deodorant bead containing zeolite, which has excellent deodorizing properties and antibacterial properties, and can prevent air pollution by adsorbing fine dust and heavy metals.

1 is a flow chart of the waterproof composition of the present invention and a method for waterproofing a concrete structure using the same.

Hereinafter, in order to describe in detail enough that a person of ordinary skill in the art can easily implement the present invention, reference will be made to preferred embodiments of the present invention and the accompanying drawings. Other objects, features, and operational advantages, including the object, operation, and effect of the present invention, will become more apparent by the description of the preferred embodiment.

For reference, the embodiments disclosed herein are only the ones selected and presented by selecting the most preferred embodiments to aid the understanding of those skilled in the art among various possible examples, and the technical idea of the present invention is not necessarily departing from the suggested idea. It should be noted that changes and additions are possible, as well as other equivalent embodiments.

In addition, expressions of terms or words used in the specification and claims are based on the principle that the inventor can appropriately define the concept of the term in order to explain it in the best way with his own invention. It should not be interpreted as being limited to a dictionary meaning only, but should be interpreted as a meaning and concept consistent with the technical idea of this invention. As an example, a singular expression includes a plural expression unless the context clearly indicates otherwise.

1 is a flow chart of the waterproof composition of the present invention and a method for waterproofing a concrete structure using the same.

As shown in Figure 1, in the construction of the waterproof composition of the present invention and a concrete structure waterproofing method using the same, the steps of arranging the surface of the concrete structure (S10); Preparing a waterproof coating composition (S20); Applying a heat-stirred waterproof coating composition to the concrete structure (S30); And applying a fine dust adsorbent to the concrete structure to which the waterproof coating composition is applied (S40).

In the step of preparing the waterproof coating composition (S20), heat and stir until the viscosity of the waterproof coating composition becomes 2000 ~ 4000 cps.

When the viscosity of the waterproof coating composition exceeds 4,000 cps, the outlet (not shown) of the coating unit is clogged, making it unsuitable for the process, and when the viscosity of the waterproof coating composition is less than 2,000 cps, the application unit (not shown) ), there is a problem that the floor may become slippery and contaminated due to the occurrence of splashing around when spraying.

The step (S20) of preparing the waterproof coating composition is prepared by including 15 to 18 parts by weight of natural additives, 3 to 5 parts by weight of deodorant beads including zeolite, and 3 parts by weight of a flame retardant, based on 100 parts by weight of the total composition.

The natural additives, based on 100 parts by weight of the total composition, 11 to 18 parts by weight of carob soybean gum, 10 to 15 parts by weight of polylactic acid, 8 to 10 parts by weight of butyl acrylate, 5 parts by weight of evergreen bark extract, epoxide soybean It contains 1 to 3 parts by weight of oil.

In general, butyl acrylate is widely used as an adhesive, and adhesion can be increased by adding it to the above natural additives. In particular, butyl acrylate and natural additives have good compatibility with each other, and due to the influence of a cross-linking network, the polymer chains are entangled and there are few restrictions on the movement of the molecular chains, thereby maximizing the flexibility of the binder.

Kyraya saponin, which is contained in a large amount in the above evergreen bark extract, is known to have excellent surfactant effect among saponins because there are many hydroxyl groups in the molecule, and natural additives can be uniformly mixed by adding such an evergreen bark extract . In addition, it can exhibit an antibacterial effect.

Deodorizing beads containing the zeolite, adding 10 to 15% by weight of PVA and 1 to 5% by weight of sodium alginate to 65 to 70% by weight of D/I Water and completely dissolving by stirring (S21); Adding 10 to 15% by weight of zeolite to the dissolved solution and dissolving by stirring (S22); Spray-drying the stirred composition to a size of 300 ~ 500㎛ (S23); Curing the spray-dried composition in an electric furnace for 20 hours (S24); And washing the cured composition with distilled water (S25), and having a diameter of 300 to 500 μm is used.

The zeolite used at this time may be 10 to 15% by weight based on the stirring composition before spray drying, and if it is less than 10% by weight, the deodorizing property is weak, and if it exceeds 15% by weight, the zeolite is excessively adsorbed to PVA. It may become deodorant.

In the step of applying the fine dust adsorbent (S40), the fine dust adsorbent may include 55 to 65% by weight of a polysaccharide gel prepared by concentrating seaweed and aloe; 20-25% by weight of titanium oxide; 12-15% by weight of cationic starch; And 3 to 5% by weight of carboxymethylcellulose.

The benign starch contains at least one or more of corn, high amylose, and tapioca.

The amphoteric starch contained at this time is included to improve the persistence of the adsorbent, and is preferably included in 12 to 15% by weight. The cationic starch used in this invention may be derived from at least one of corn, high amylose, tapioca, and sago.If it is added in an amount of less than 12% by weight, the effect may be insignificant due to the small amount of fine dust adsorption as an adsorbent. If it is added in excess of weight %, it is not preferable because the fixability of the fine dust adsorbent may be deteriorated.

In addition, the carboxymethyl cellulose contained at this time is preferably added in 3 to 5% by weight, and if it is added in less than 3% by weight, it is not preferable because the surface persistence as an adsorbent may be lowered, and if it is added in excess of 5% by weight, fine The cohesive force of the dust adsorbent becomes strong, and the coated state of the surface may not be smooth, which is not preferable.

At this time, the temperature for stirring by adding titanium oxide to the polysaccharide gel containing amphoteric starch and carboxymethylcellulose is preferably 35 to 45°C. If the stirring temperature is less than 35°C, the time for the titanium oxide to dissolve in the polysaccharide gel may be prolonged. Therefore, when it exceeds 45°C, the moisture content of the polysaccharide gel decreases and the viscosity of the adsorbent increases, which is not preferable.

In addition, at this time, the time to stir the titanium oxide is preferably 10 to 15 minutes, and if the stirring time is less than 10 minutes, it is not preferable because the titanium oxide may not be sufficiently dissolved, and if it exceeds 15 minutes, the viscosity of the adsorbent increases. Not.

(Experimental Example 1)

In order to analyze the dynamic flexibility of the natural additives (Example 1, Comparative Example 1, Comparative Example 2, Comparative Example 3), an N535 dynamic mechanical analyzer (DMA) from Perkin-Elmer was used. A rectangular film with a width of 10 mm, a length of 30 mm, and a thickness of 0.4 to 0.7 mm was manufactured using a hydraulic press, and a dynamic viscoelasticity analysis was performed at a temperature rise rate of 10°C/min, a temperature range of -100 to 180°C, and a frequency of 1 Hz. The results are shown in Table 1 below.

Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Carob Bean Gum 15 35 25 15 Polylactic acid 10 × 10 10 Butyl acrylate 10 × × 10 Evergreen bark extract 5 5 5 × T _g obtained by tanδ(℃) 85.7 58.9 -44.2, 58.9 65.2

As described above, in the case of Comparative Example 2, the tanδ peaks were two, respectively, and it was confirmed that the compatibility between the materials of the natural additive was small. In the case of Comparative Example 3, the tanδ peak appeared as one peak, but since it was a value between Example 1 and Comparative Example 1 in which polylactic acid and butyl acrylate were not added, it can be determined that it has partial compatibility. In the case of Example 1, the tanδ peak appeared as one peak, and the value was the highest, and it can be determined that the compatibility between materials of natural additives increased. Therefore, by applying the natural additive having improved compatibility according to the present invention to the waterproof coating composition, durability and flexibility can be increased to prevent cracking of the concrete structure and increase the maintenance period.

(Experimental Example 2)

In order to confirm whether the above-described natural additives can exhibit an antibacterial effect, a natural additive (Example 1, Comparative Example 3) was prepared and a bacteria detection test was performed. The bacteria detection test was performed on a sterile workbench, and a dry film medium for Staphylococcus aureus was used.

First, add 9 mL of sterilized water to 1 g of pulverized natural additives, and make a 10-fold diluted solution evenly mixed using a homogenizer. After transferring the sample diluted solution to a sterilized test tube, inoculate Staphylococcus aureus to a concentration of 3.0×10 ² CFU/mL, and mix it with a Voltex Mixer. After inoculating 1 mL of the completed sample solution into a dry film medium, transfer to an incubator and incubate at 35°C for 48 hours. After 48 hours, the number of colonies formed on the dried film medium was read to calculate the rate of change of the number of bacteria. The results are shown in Table 2 below.

Example 1 Comparative Example 3 Evergreen bark extract 5 × Bacteria concentration (CFU/mL) 1.7×10 ² 3.6×10 ² Rate of change in the number of bacteria -41% +22%

As described above, in the case of Comparative Example 3 in which the evergreen bark extract was not added, the concentration of the inoculated bacteria was increased, and in the case of Example 1, a significant number of bacteria were removed. Therefore, it is possible to exhibit an antibacterial effect by waterproofing a concrete structure with a waterproof coating composition including natural additives according to the present invention.

(Experimental Example 3)

In order to check whether the deodorizing beads of the present invention can remove odor, a waterproof coating concrete structure (Example 1, Comparative Example 4) having a size of 10 cm × 10 cm × 10 cm was prepared and a deodorizing effect measurement test was performed.

A box size of 850mm×562mm×562mm was made using an acrylic plate, and a Stirrer/Hot was put in the box, and a 5cm×8cm hole was made in one side of the box, and a lid was made to make a deodorizing test apparatus. At this time, all gaps in the box except for the holes were sealed with parafilm.

After 0.5ml of ammonia water in the vial is heated with a stirrer/hot to evaporate, the ammonia water is completely evaporated and spreads evenly (takes about 10 minutes). And the box was sealed again. After 10 minutes, 30 minutes, and 60 minutes passed, the ammonia concentration in the box was measured with an detector tube, and the results are shown in Table 3 below.

Example 1 Comparative Example 4 Presence of deodorant beads ○ × After 10 minutes
Concentration (ppm) 310 260 After 30 minutes
Concentration (ppm) 170 255 Reduction rate (%) 45.1 1.91

As described above, it was confirmed that the deodorization rate of Example 1 was excellent at 45.1%, and the concrete structure to which the waterproof coating composition including deodorant beads was applied according to the present invention exhibited a deodorizing effect.

(Experimental Example 4)

An experiment was performed to confirm the effect of adsorbing heavy metals and fine dust of the concrete structure coated with the fine dust adsorbent. Cadmium, lead, aluminum, and fine dust (each 100 ppm) were reacted with a specimen cut into 150 mm length and 50 mm width for 30 minutes, respectively, and the adsorption rate was measured through atomic absorption spectrometry. The adsorption rate was calculated by dividing the concentration of the sample after adsorption of heavy metals and fine dust by the concentration of the sample before adsorption, and the higher the adsorption rate, the more effective it means to adsorb and remove heavy metals and fine dust, and the results are shown in Table 4 below. Indicated.

Example 1 Comparative Example 5 Presence of fine dust adsorbent ○ × Cadmium adsorption rate (%) 62 15 Lead adsorption rate (%) 55 19 Aluminum adsorption rate (%) 65 23 Fine dust adsorption rate (%) 61 21

As a result, in the concrete structure to which the fine dust adsorbent of the present invention is applied, the adsorption capacity of heavy metals and fine dust is significantly increased. Therefore, by applying the fine dust adsorbent of the present invention to a concrete structure, air pollution can be prevented and further improved.

Claims (7)

Arranging the surface of the concrete structure;
Preparing a waterproof coating composition;
Applying a heat-stirred waterproof coating composition to the concrete structure; And
Including; applying a fine dust adsorbent to the concrete structure to which the waterproof coating composition is applied,
The waterproof coating composition includes a deodorant bead containing zeolite,
Deodorant beads containing the zeolite,
Adding 10 to 15% by weight of PVA and 1 to 5% by weight of sodium alginate to 65 to 70% by weight of D/I Water, and completely dissolving by stirring;
Adding 10 to 15% by weight of zeolite to the dissolved solution and dissolving by stirring;
Spray-drying the stirred composition to a size of 300 to 500 μm;
Curing the spray-dried composition in an electric furnace for 20 hours; And
Washing the cured composition using distilled water; Including, and a method for waterproofing a concrete structure using a waterproof composition, characterized in that using a diameter of 300 ~ 500㎛. The method of claim 1,
The step of preparing the waterproof coating composition,
Concrete structure waterproof coating method using a waterproof composition, characterized in that heating and stirring until the viscosity of the waterproof coating composition becomes 2000 ~ 4000 cps. The method of claim 1,
The step of preparing the waterproof coating composition,
Based on 100 parts by weight of the total composition, 15 to 18 parts by weight of natural additives, 3 to 5 parts by weight of deodorant beads including zeolite, and 3 parts by weight of a flame retardant. The method of claim 3,
The natural additive,
Based on 100 parts by weight of the total composition, 11 to 18 parts by weight of carob bean gum, 10 to 15 parts by weight of polylactic acid, 8 to 10 parts by weight of butyl acrylate, 5 parts by weight of evergreen bark extract, 1 to 3 parts by weight of epoxide soybean oil Concrete structure waterproof coating method using a waterproof composition comprising a portion. delete The method of claim 1,
The fine dust adsorbent,
55-65% by weight of a polysaccharide gel prepared by concentrating seaweed and aloe; 20-25% by weight of titanium oxide; 12-15% by weight of cationic starch; And carboxymethyl cellulose 3 to 5% by weight; Concrete structure waterproofing method using a waterproof composition comprising a. Based on 100 parts by weight of the total composition, 15 to 18 parts by weight of natural additives, 3 to 5 parts by weight of deodorant beads including zeolite, and 3 parts by weight of a flame retardant,
The natural additives, based on 100 parts by weight of the total composition, 11 to 18 parts by weight of carob soybean gum, 10 to 15 parts by weight of polylactic acid, 8 to 10 parts by weight of butyl acrylate, 5 parts by weight of evergreen bark extract, epoxide soybean Waterproof composition comprising 1 to 3 parts by weight of oil.

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