KR100886516B1 - The painting method using the mixed floor coating composite - Google Patents

Abstract

The present invention is a polyamine-polyurethane copolymer prepared by adding an unsaturated polyamine amide to the polyurethane is diluted and applied as a primary coating primer (primer), a filler composed of silica powder, mica (talc) and talc (talc) Is mixed with the polyamine-polyurethane copolymer and applied for secondary coating, and the undiluted polyamine-polyurethane copolymer is applied for tertiary coating, thereby significantly improving adhesion to the base surface, It is possible to solve the problem of lifting or painting surface which occurs when using the product.In the case of the top coating for aesthetics, the adhesion between the bottom surface and the top coating surface is excellent, so that defects are minimized. There is no need to perform a separate filling process for minute cracks so that waterproofing and flooring can be performed at once. This is to prevent damage to the bottom surface by water and to reduce the damage caused by water leakage.

Description

Coating method using mixed floor coating agent {THE PAINTING METHOD USING THE MIXED FLOOR COATING COMPOSITE}

1a and 1b is a view showing a test on the surface of the concrete test body constructed by the painting method and the general coating method according to a preferred embodiment of the present invention

<Description of the symbols for the main parts of the drawings>

10: upper tension jig 20: lower tension jig

30 coating agent 40 adhesive

50: steel support plate 60: concrete specimen

The present invention relates to a coating method using a floor coating agent, and more particularly, construction of a flooring material or a waterproofing agent used to prevent deterioration of concrete and floor corrosion of the bottom plate concrete by water and chloride penetrating through the concrete surface. The present invention relates to a coating method using a mixed floor coating agent to perform waterproof construction and floor construction at a time because there is no need to perform a separate wrapping process for minute cracks.

In general, the most important consideration in the floor construction of the underground parking lot of an apartment or building is the performance of the flooring itself. However, in the case of the underground parking lot, there is a problem of waterproofing between floors, so in order to solve this problem, the flooring work must be performed after waterproofing separately before the floor coating. However, due to cost problems and cumbersome work, it is often the case that only the floor construction is carried out without the waterproofing. In this case, defects inevitably occur due to the lifting of the flooring material due to leakage after completion, and there is a problem in that considerable manpower and economic losses occur because the concrete structure already installed for such defects must be repaired.

All concrete structures are cracked. The causes of cracks in concrete structures can be classified into four categories: materials, construction, structural forces, and environmental conditions. Cracks occurring in such concrete structures are generally a combination of two or more of the four factors mentioned above. The cracks may occur immediately after the concrete is poured, and they may develop after a few days or months or even years later. Even microcracks, which are not easily observed with the naked eye, can gradually develop cracks and increase crack widths over time due to other cracking factors, and sometimes occur in excess of the allowable harmful cracks that affect the usability and durability of the structure. Can be developed. In other words, the cracks generated in the concrete structure are compounded by the four crack factors mentioned above, and the occurrence time of cracks is widely distributed at various times from the beginning of construction to several years later. For example, the wall of the subway box structure is a structure in which the temperature shrinkage crack is generated by the heat of hydration at the beginning of the construction, but even if it is not occurred at the beginning of construction, the crack factor due to the concrete drying shrinkage overlaps the crack after a certain time has elapsed. This may occur.

It is easy to see cracks on the floors, walls, or ceilings of underground parking lots, such as apartments and buildings. In case of underground parking lot of new building, it prevents dust from flying after concrete casting or floor finish coating for protection or aesthetics of concrete surface. Epoxy resin or urethane is used as the finishing material. Epoxy resin is the most used material, but has a disadvantage of weak water resistance and resistance to impact, and urethane has a disadvantage in that it has a waterproof function, but the performance as a flooring material is inferior in recent years. In addition, epoxy or urethane work should be done after the microcracks are filled in advance, or the film thickness should be over 3.0mm. In case of epoxy, epoxy primer is applied and epoxy or asphalt adhesive is applied on it, and then silica sand or aggregate is sprayed or mixed on it. In this case, the primer layer of epoxy has no elongation. There is no problem of cracking or cracking easily due to impact or shaking.

The present invention was developed to solve the problems of the prior art, a polyamine-polyurethane copolymer prepared by adding an unsaturated polyamine amide to the polyurethane is diluted and applied as a primary coating primer, silica powder, Filler consisting of mica and talc is mixed with the polyamine-polyurethane copolymer and applied for secondary coating, and the undiluted polyamine-polyurethane copolymer is applied for tertiary coating, To improve the adhesion of the remarkably, and to solve the problem of lifting or painting surface that occurs when using only ordinary resin, and when the top coating for aesthetics, the adhesion between the bottom surface and the top coating surface This makes it possible to minimize the occurrence of defects and to perform a separate filling process for fine cracks. Its purpose is to prevent damage to the floor surface by water and to reduce damage caused by water leakage by enabling waterproof and floor works to be performed at one time.

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

The floor coating agent used in the present invention is a polyamine-polyurethane copolymer prepared according to Korean Patent No. 10-694200 registered by the same applicant as the applicant of the present invention. Although the above patents are incorporated herein by reference, the following describes briefly the characteristic configurations of the polyamine-polyurethane copolymers so that the present invention can be more clearly understood.

Polyamine amide is added to the polyurethane to prepare the polyamine-polyurethane copolymer used in the present invention. At this time, the pH of the prepared copolymer is 6 to 8, the viscosity is 250 to 400cps, the specific gravity is preferably 1.0 to 1.1. Polyol was reacted with isocyanate in the reaction solvent to prepare a polyurethane having 3 to 10% of the -NCO functional groups of isocyanate remaining, and then polyamine amide was added to react for 30 minutes to 5 hours at a temperature of 50 ° C to 80 ° C. A new type of polyamine-polyurethane copolymer having a structure is prepared.

When the polyamine-polyurethane copolymer prepared by the above method is coated on the concrete surface, the heat resistance and chemical resistance of the coating film are very excellent and excellent waterproof effect is obtained. The polyamine-polyurethane copolymer is described in more detail as follows.

Methods of making polyurethanes by reacting polyols with isocyanates are well known to those skilled in the art. Polyols are largely divided into polyester polyols or polyether polyols, both of which may be used. It is preferable that the molecular weight of a polyol is 100-800. When the molecular weight is less than 100, the impact resistance and elongation of the obtained copolymer waterproofing agent are low, and thus the adhesive strength is lowered. When the molecular weight is larger than 800, the strength and heat resistance of the copolymer waterproofing agent obtained are poor. It is also possible to mix and use two or more of the polyols having a molecular weight in the above range. The isocyanate may be all isocyanate generally used for polyurethane production, but polymethylene polyphenyl isocyanate having a molecular weight of 50 to 300 is preferable.

The content ratio of polyol and isocyanate is determined according to the type of polyol and isocyanate used, which can be easily determined by those skilled in the art. The equivalent ratio of NCO / OH of the prepolymer is preferably 0.9 to 0.97 so that 3% to 10% of the -NCO functional groups of the isocyanate remain in the polyurethane obtained. If the remainder of the -NCO functional group is less than 3%, it is likely to cure during the reaction with the polyamine amide, and if it exceeds 10%, the physical properties of the final product are poor. The solvent for the reaction of the polyol and the isocyanate is preferably a general aromatic solvent such as toluene and xylene.

The reaction temperature of the polyol and isocyanate is between room temperature and 80 ° C. If the reaction temperature is higher than 80 ℃ the molecular weight of the copolymer produced increases the adhesive strength, if the temperature is too low below room temperature, the strength of the initial coating film is good but has a weak disadvantage in impact. Process conditions for other polyurethanes, such as catalysts and solvents required for the reaction, are in accordance with general polyurethane production methods, which can be readily determined by one skilled in the art.

The polyurethane thus obtained does not have heat resistance and cannot perform a proper function as a crosslinking waterproofing agent. In the present invention, the resulting polyurethane is reacted with polyamine amide at a temperature of 50 ° C. to 80 ° C. for 30 minutes to 5 hours to prepare a copolymer. The polyamine amide is preferably an unsaturated compound having an amine value of 25 to 35 and a refractive index of 1400 to 1500.

The polyamine amide is added at 0.5 to 5 parts by weight based on 100 parts by weight of polyurethane. If it is added less than 0.5 parts by weight, the desired heat resistance is not obtained, and if it is added more than 5 parts by weight, the adhesive strength is lowered and the shock is weak. The copolymer waterproofing agent thus prepared has the most excellent heat resistance, so it is most suitable for waterproofing bridges. In addition to bridges, the copolymer waterproofing agent may be widely used as a general waterproofing agent for waterproofing roads or building exterior walls.

The present invention provides a coating method using a mixed floor coating agent using a polyamine-polyurethane copolymer prepared by the above method.

First, the polyamine-polyurethane copolymer prepared by the method described above is diluted in a solvent in 30% to 70% and then coated with a primary coating primer. The solvent may be urethane thinner, xylene or toluene. The polyamine-polyurethane copolymer is applied for secondary coating by using a mixture including silica powder, mica and talc, and finally the undiluted polyamine-polyurethane copolymer is applied for tertiary coating.

The filler is made of a mixture of silica powder, mica and talc, each of which is composed of 90% to 95% silica powder, 2% to 10% mica, 2% to 10% talc by weight. The finer the particle size of the silica powder used for the filler is preferable. However, since the finer the more expensive, it is generally preferred to use particles of 200 to 400 mesh size, more preferably particles of 325 mesh size. The use of 3% to 5% by weight of the mica can more effectively compensate for the microcracks, and the talc can further enhance the bond between the copolymer and the filler by using 2% to 5%.

Painting method using a mixed floor coating agent according to a preferred embodiment of the present invention is as follows.

First, the foreign material on the concrete base surface is removed, and large holes or cracks are pre-filled.

Second, the polyamine-polyurethane copolymer prepared by the above method is diluted to 30% to 70% to perform painting with a roller and spray (primary coating).

Third, to 100 parts by weight of the polyamine-polyurethane copolymer prepared by the above method, 20 to 100 parts by weight of the filler mixed with silica powder, mica and talc are mixed well with stirring, followed by painting with a roller or spray ( 2nd painting). The curing time after the second coating is usually 4-8 hours.

Fourth, the polyamine-polyurethane copolymer prepared by the above method is coated with a roller or spray without dilution (tertiary coating). At this time, if you want to color for aesthetics, you can use a mixture of inorganic pigments. The third coating should be performed within 48 hours after the secondary coating is cured, because if the third coating is performed after 48 hours, the required interlayer adhesion may not be obtained.

Hereinafter will be described by comparing the test results for the coating method and the general coating method using the mixed floor coating agent according to the present invention.

Example

Step 1: Filler Filling

1000 g of filler is prepared by mixing 930 g of silica powder of 325 mesh size, 40 g of mica, and 30 g of talc.

Step 2: Mixing Filler with Polyamine-Polyurethane Copolymer

1000 g of the filler mixed in Step 1 was slowly added to 2000 g of polyamine-polyurethane copolymer and stirred with a stirrer.

Step 3: Prepare the Subcontracting Solution

50 g of solvent is added to 100 g of polyamine-polyurethane copolymer so that the concentration is diluted to facilitate penetration into concrete.

Step 4: seal

After removing the foreign substance on the concrete surface, the undercoating solution prepared in step 3 is applied with a roller or spray. At this time, the film thickness is 50 micrometers-100 micrometers. After 3 to 4 hours have elapsed after performing the undercoat, the mixed solution of the filler prepared in step 2 and the polyamine-polyurethane copolymer is coated with a roller or spray. After coating, the curing time takes 4-8 hours, and after that, the coating is performed with an undiluted polyamine-polyurethane copolymer within 48 hours. At this time, if the top coat is performed after 48 hours, the interlayer adhesion may be reduced.

The physical properties of the concrete construction body according to the coating method of the present invention carried out according to Example 4 and the physical properties of the concrete construction body constructed by the general coating method without using the filler was performed.

Here, the test for adhesion strength (Mpa) is performed as follows.

First, the coating method according to the present invention and the coating method according to the present invention on the surface of the concrete test body, and then as shown in Figure 1 put the upper jig for tension, as shown in Fig. Remove the adhesive. A groove is formed along the steel jig and as shown in FIG. 2, a tensile force is applied in the vertical direction to the test body surface with the lower tension steel jig and the steel support plate to obtain the maximum tensile load. Evaluation after the test is made according to the dropping state of the tensile jig and the pull-out adhesive strength at the time of measurement.In the case of the dropping state, the base (base) breakdown, the surface drop of the base and the coating layer, the breakage of the coating layer, and the coating layer It can be divided into four stages of dropping the interface of the tension jig.

Test results for the coating method and the general method according to the invention are shown in the table below.

TABLE 1

As can be clearly seen from Table 1, the coating method according to the present invention shows that the adhesive strength is 2.5 Mpa, the adhesive strength is increased by more than twice compared to the general coating method having an adhesive strength of 1.2 Mpa. However, it can be seen that the lifting effect does not occur due to the increased adhesion strength compared to the general method.

Confirmation of the concrete crack filling can be determined whether the filling is observed by visually filling the crack, the coating method according to the present invention was found that there is no abnormality in the micro crack filling. In addition, the waterproof performance test is a concrete test piece coated with a microcrack in the coating method and the general coating method according to the present invention and weighed, and then put it in water and take out after 1 hour to measure the weight by measuring the weight change concrete specimen It can be confirmed whether or not the water is soaked in, the coating method according to the present invention was also confirmed that there is no problem in the waterproof performance.

As described above, in the present invention, a polyamine-polyurethane copolymer prepared by adding an unsaturated polyamine amide to a polyurethane is diluted and applied as a primary coating primer, and a filler composed of silica powder, mica and talc is applied to the polyamine-. By mixing with a polyurethane copolymer and applying for secondary coating, and applying the undiluted polyamine-polyurethane copolymer for tertiary coating, there is an excellent effect that the adhesion to the base surface is significantly improved, and only general resin Compared to the use of this product, the adhesive strength is excellent, and the problem of lifting or painting surface is solved, and when the top coating for aesthetics, the adhesion between the bottom surface and the top coating surface is excellent, and the defects are minimized. There is no need to perform a separate pavement process for minute cracks. By allowing the yarn to be carried out at one time, it has the advantage of preventing damage to the bottom surface by water and reducing the damage caused by water leakage.

The present invention having the configurations and effects described above can be modified in various ways, and the above description is not intended to limit the scope of the present invention. In addition, various modifications and variations are possible without departing from the spirit and scope of the invention, and modifications apparent to those skilled in the art to which the invention pertains are included within the scope of the following claims.

Claims (5)

The polyamine-polyurethane copolymer prepared by adding unsaturated polyamine amide to the polyurethane was diluted and applied with a primary coating primer, and the polyamine was filled with a filler composed of silica powder, mica and talc. -A coating method using a mixed floor coating agent, characterized in that the coating is applied for secondary coating by mixing with the polyurethane copolymer, and applying the undiluted polyamine-polyurethane copolymer for tertiary coating. According to claim 1, wherein the polyamine-polyurethane copolymer used as the primary coating primer is diluted in a solvent at a concentration of 30% to 70% by weight, the solvent is urethane thinner, xylene or toluene Painting method using a mixed floor coating characterized in that. The coating material of claim 2, wherein the filler is mixed at a ratio of 90% to 95% silica powder, 2% to 10% mica and 2% to 10% talc by weight. Method. The mixed bottom according to claim 3, wherein the material used for the secondary coating is applied by mixing 20 to 100 parts by weight of a filler mixed with silica powder, mica and talc to 100 parts by weight of a polyamine-polyurethane copolymer. Coating method using coating agent. The mixed tertiary coating agent according to any one of claims 1 to 4, wherein the tertiary coating polyamine-polyurethane copolymer is used by additionally mixing inorganic pigments coloring for aesthetics. Painting method.

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