KR20030016541A - The composites of inorganic covering material developing high adhesive strength in the wet surface condition - Google Patents

Abstract

PURPOSE: An inorganic section coating material composition is provided, to improve the adhesive strength to the wet surface, the acid resistance and the chemical resistance, and to enhance processability by enabling the coating process of a primer to be omitted. CONSTITUTION: The inorganic section coating material composition comprises 100 parts by weight of a mixture comprising a hydrophilic epoxy resin, a curing agent and inorganic powder in the ratio of 1 : 2.5 : 3-9 by weight; and 20 parts by weight of water. Preferably the inorganic powder comprises special cement with a fineness of 5,000 cm2/g and silica in the ratio of 45-65 : 35-55 by weight. Optionally the mixture of the composition comprises a hydrophilic epoxy resin, a curing agent, inorganic powder and an adhesive strength reinforcing agent in the ratio of 1 : 2.5 : 3-9 : 0.5 by weight.

Description

The composites of inorganic covering material developing high adhesive strength in the wet surface condition}

The present invention relates to an inorganic cross-section coating composition having excellent adhesion to a wet surface, and has an injection performance so that excellent adhesion strength can be expressed in a wet state in constructing a coating layer required for anticorrosive and repair work of reinforced concrete structures. The present invention relates to an inorganic cross-section coating composition comprising a fine powder special cement, silica, an aqueous epoxy host and a hardener.

As a concrete anticorrosive work, a method of forming a protective film by applying a synthetic resin coating material such as epoxy resin to the concrete surface is generally performed. However, when the synthetic resin coating material is applied, adhesive damage such as lifting, cracking, peeling, etc. of the coating layer is frequently generated, resulting in a great problem in durability performance. The main characteristic is the intrinsic material properties of concrete, which contain moisture as a related and porous heterogeneous material. In this regard, many studies have been conducted on the adhesive damage due to the stress caused by the synthetic resin applied to the concrete surface and the physicochemical factors in the concrete composite, the pore structure of the concrete, and alkali. In other words, water vapor pressure, capillary suction input, and penetration pressure generated in the adhesion interface between concrete and the cladding are caused by adhesion damage to each other due to relatively small stress due to stress concentration at the weak part or the defect part of the interface.

In addition, by applying the synthetic resin coating material directly on the surface of the form peeling material used for concrete casting, the latentness generated during concrete hardening, dust, foreign matter, oil, and dirt generated from demolding work, etc. The adhesive strength of the anticorrosive coating material is significantly reduced.

Therefore, it was found that the quality of the concrete surface is a factor influencing the adhesive damage of the anticorrosive coating layer. This is because not only concrete but also various materials such as metal and wood are inadequate as the coating of the coating material alone, so in order to secure the construction quality and durability of the coating, it is necessary to improve the surface of the substrate to have the appropriate quality as the coating base. This is called background adjustment, and it is an important point to perform background adjustment appropriately for the base material and condition, and if it is concrete, if it is wet, if it is wet, the coating function is durable for the wet condition. It is important to create a sustainable cloth base.

Background adjustment materials that are applied in Korea are largely waterproof cement, waterproofing cement liquid, siliceous penetration waterproof, cement cement (SBR-based, PAE-based), cement-free motor, non-condensed grout material, epoxy resin-based It is classified into resin system such as waterproofing, anticorrosive and repairing material, unsaturated polyester waterproofing, vinyl polyester waterproofing, ceramic lining and other waterproofing systems (asphalt waterproofing, sheet waterproofing, rubber asphalt waterproofing, aramid glass, carbon fiber, etc.), As concrete anticorrosive construction, a method of forming a protective film by applying a synthetic resin coating material such as epoxy resin to the concrete surface is generally performed.

However, when applying the synthetic resin film material as described above, due to the difference in thermal expansion coefficient and elastic modulus with the concrete matrix, the adhesive damage such as lifting, cracking, peeling of the coating layer frequently occurs, there was a big problem in durability performance .

The present invention has been made in consideration of the above problems, and its object is to provide stable adhesion to the wet and dry conditions of concrete, good adhesion to the coating material, small uneven parts of the concrete, treatment of voids It is possible to provide an inorganic cross-sectional coating composition which can be surely provided with a smooth and dense finish, good water resistance, and excellent adhesion to wet surfaces without deterioration in temperature change.

The present invention mixes a hydrophilic epoxy resin base material, a hardening material and an inorganic powder in a ratio of 1: 2.5: 3-9, and has excellent adhesion to a wet surface to which 20 parts by weight of water is added to 100 parts by weight of the blended mixture. An inorganic cross-sectional coating composition is provided.

1 is an exemplary view showing a change in primary adhesion (dry curing) according to the age of the dry ground conditions using the present invention

Figure 2 is an exemplary view showing a change in primary adhesion (wet curing) according to the age of dry ground conditions using the present invention

Figure 3 is an exemplary view showing a change in the primary adhesion (dry curing) according to the age of the wet ground conditions using the present invention

Figure 4 is an exemplary view showing a change in primary adhesion (dry curing) according to the age of the wet ground conditions using the present invention

5 is an exemplary view showing a change in the secondary adhesion for each reheat using the present invention

The present invention mixes an aqueous epoxy base material, a polyamide cured material and an inorganic powder in an appropriate ratio with excellent adhesion properties to the wet surface of the concrete and excellent in water resistance, abrasion resistance, chemical resistance, strength and the like, and the inorganic powder, hydrophilic epoxy resin base material and A proportion of water is added to the total weight of the mixture made of the hardener.

The inorganic powder is a special cement fine powder and silica is mixed in a certain ratio, the special cement fine powder is a special cement with a powder of 5000 ㎠ / g, and the silica fine particles of about 55 to 35 weight relative to 45 to 65 weight of special cement Minutes are mixed. In this case, the silica usually uses a conventional silica having a powder degree of 2000 cm 2 / g.

Hereinafter, the present invention will be described in detail with reference to Examples.

Example 1

1 is an exemplary view showing a primary adhesion force change (dry curing) according to the age of the dry ground conditions using the present invention, Figure 2 is a primary adhesion force change (wet curing) according to the age of dry ground conditions using the present invention 3 is an exemplary view showing a change in the primary adhesion force (dry curing) according to the age of the wet ground conditions using the present invention, Figure 4 is a primary according to the age of the wet ground conditions using the present invention An illustration showing changes in adhesion (dry curing) is shown. The hydrophilic epoxy base, hardener, inorganic powder, and water are mixed in a certain ratio, and other adhesive reinforcements are mixed in a constant ratio according to the ground conditions and curing conditions. Primary adhesion performance was evaluated. The results are shown in Table 1.

Table 1

division Compounding ratio (epoxy land: hardening material: inorganic powder (water)) Background Curing condition Bond strength by age (kgf / ㎠) Remarks 3 days 7 days 14 days 28 days 1-1 1: 2.5: 3 (10%) dry Air 11.10 12.93 19.30 20.88 W / C = 50% Wetting 14.60 18.73 24.05 26.90 Wetting Air 13.66 14.75 18.20 18.80 Wetting 10.40 12.46 16.80 19.87 1-2 1: 2.5: 3 (10%)-P dry Air 13.93 15.05 14.40 23.98 Wetting 15.76 18.60 18.50 24.50 Wetting Air 15.35 14.70 18.45 20.98 Wetting 14.90 15.90 21.13 24.06 2-1 1: 2.5: 6 (20%) dry Air 17.76 18.56 17.93 14.04 Wetting 13.83 14.80 18.93 19.61 Wetting Air 9.66 13.50 21.13 25.05 Wetting 13.43 14.93 16.56 27.47 2-2 1: 2.5: 6 (20%)-P dry Air 14.60 13.55 17.03 18.30 Wetting 15.93 16.13 20.20 20.65 Wetting Air 17.10 16.80 15.80 21.77 Wetting 16.56 14.30 20.26 24.05 3-1 1: 2.5: 6: 0.5 (20%) dry Air 14.20 13.80 14.96 23.49 Wetting 14.33 19.06 21.50 22.74 Wetting Air 10.13 13.66 18.70 24.10 Wetting 13.43 16.33 20.10 27.24 3-2 1: 2.5: 6: 0.5 (20%)-P adhesive stiffener dry Air 16.40 11.40 17.03 18.32 Wetting 15.70 16.65 17.15 22.94 Wetting Air 19.10 21.30 21.20 17.94 Wetting 17.90 18.95 19.80 26.48 4-1 1: 2.5: 9 (30%) dry Air 19.10 17.10 14.33 20.24 Wetting 14.60 15.30 19.20 25.99 Wetting Air 9.50 10.60 17.63 18.14 Wetting 11.50 20.76 21.00 23.06 4-2 1: 2.5: 9 (30%)-P dry Air 14.30 16.40 13.26 16.68 Wetting 15.56 17.70 17.95 21.49 Wetting Air 12.80 15.25 21.00 21.01 Wetting 17.60 19.73 19.50 23.33

The specimen 1-1 is a mixture of a hydrophilic epoxy resin base material, a cured material and an inorganic powder in a ratio of 1: 2.5: 3, and about 10% of water is added based on 100% of the mixture. After 20 days), it shows more than 15kgf / ㎠ adhesion performance and shows a steady increase regardless of curing conditions. In early age, it does not exceed the standard value, but it shows more than 20 days of attachment performance.

In the 1-2 specimen, a hydrophilic epoxy resin base material, a hardening material and an inorganic powder were mixed at a ratio of 1: 2.5: 3, and about 10% water was added based on 100% of the mixture, and a primer was applied. In early age, the adhesion performance of 15-20 kgf / cm 2 or more is shown, and the long-term adhesion performance is high as 20-25 kgf / cm 2.

The 2-1 specimen is a mixture of a hydrophilic epoxy resin base material, a hardening material and an inorganic powder in a ratio of 1: 2.5: 6, and added about 20% of water based on 100% of the mixture, the initial adhesion performance of the dry ground Long-term growth rate was lower than that of wet ground, whereas wet growth showed higher adhesion performance of 25kgf / cm2 or longer at long-term age.

In the 2-2 specimen, a hydrophilic epoxy resin base material, a hardening material, and an inorganic powder were mixed at a ratio of 1: 2.5: 6, and about 20% of water was added based on 100% of the mixture, and a primer was applied. In general, there was a temporary decrease on the 10th day of age, but again, the increase was observed with the age.

The 3-1 specimen was prepared by mixing a hydrophilic epoxy resin base material, a hardening material, an inorganic powder, and an adhesive reinforcing material in a ratio of 1: 2.5: 6: 0.5 and adding about 20% of water based on 100% of the mixture. In the age of 15kgf / ㎠ shows the adhesion performance, but showed a steady increase regardless of the background and curing conditions, and under all conditions at 10 days of age showed more than the baseline adhesion performance. Long-term age is also high adhesion performance around 25kgf / ㎠.

The 3-2 specimen is a mixture of a hydrophilic epoxy resin base material, a hardening material, an inorganic powder, and an adhesive reinforcing material in a ratio of 1: 2.5: 6: 0.5, and about 20% of water is added based on 100% of the mixture. Has been applied and has similar changes in curing conditions regardless of the background conditions. In case of dry curing, it shows adhesive performance of about 15 to 20 kgf / cm 2, and changes with age are very small. Wet nursing has a low ups and downs according to the age, has an overall increase in curing, and shows high strength around 24 kgf / cm 2.

The 4-1 specimen is a mixture of hydrophilic epoxy resin, hardener and inorganic powder in a ratio of 1: 2.5: 9, and added about 10% of water based on 100% of the mixture. It is more than 5kgf / ㎠ than the wet ground, the 4-2 specimen is mixed with a hydrophilic epoxy resin base, hardener and inorganic powder in a ratio of 1: 2.5: 6, about 30% of the mixture based on 100% The addition of water, the primer is applied, the overall adhesion performance is above the standard value.

As described above, in the case of air cure, various distributions are shown for each specimen, but in the late 14 days (after 14 days), the age is more than the reference value (15 kgf / cm 2).

In addition, in the wet curing, all specimens showed uniform strength of 15-17 kgf / cm2 at early age, but the difference in strength between specimens was large in late age, and long-term age was more than 20kgf / cm2.

In wet curing, other specimens except 3-2, 2-2, and 1-2 specimens were shown to be 15kgf / ㎠ or less in early age, but 20kgf / cm2 or so in late age (after 20 days). Adhesion above the standard is shown.

In addition, the wet curing in the wet ground shows an adhesive force around 15kgf / ㎠ at the early age, and after 28 days has been shown to be above the standard value. In particular, 3-1 and 3-2 specimens exhibit high adhesion of 25 kgf / cm 2 or more.

As described above, the present invention exhibits the adhesive strength of the wet ground that is greater than or equal to the reference value on the basis of 14 days or more, and in particular, in the case of 3-2 specimens, the adhesion performance of the wet and dry environments is greater than or equal to the reference value over the entire age. We are seen and are very excellent. In addition, in terms of workability, the 3-1 specimen and the 4-1 specimen exhibited adhesion performance close to the 3-2 specimen without applying a primer, so that the construction property and the adhesion performance were good.

Example 2

According to Example 1, the mixing ratio of the hydrophilic epoxy resin base material, the hardening material, and the inorganic powder has a mixing ratio of 1: 2.5: 6, and when 20% of water is added to the entire mixture, it has the best performance. Therefore, based on the 1: 2.5: 6 (20%) mixing ratio, the component ratio of the cured material and the inorganic powder were adjusted, and the overall curing environment was dry curing at room temperature 23 ± 2 ° C., relative humidity 60%, and wet. It was built on the ground. Test results for this are as described in Table 2 and FIG.

TABLE 2

Kinds Formulation condition Bond strength by age Remarks 7 days 14 days 28 days A type 1: 2.5: 6 (20%) - 18.762 16.081 A powder 23.294 14.250 19.531 20.163 16.062 23.906 Average 21.720 16.35 19.83 Type B 1: 2.5: 6 (20%) 21.425 17.806 12.031 26.431 20.738 23.712 24.163 16.913 19.387 Average 24.000 18.485 18.370 C type 1: 2.5: 6 (20%) 20.994 18.538 19.419 24.106 16.200 32.831 25.006 18.119 29.869 Average 23.360 17.61 27.37 D type 1: 2.5: 6 (20%) 21.375 22.406 - B powder 25.212 12.969 26.925 21.637 13.294 25.856 Average 22.740 16.223 26.39 F type 1: 2.5: 6 (20%) - - 25.900 C powder 23.675 21.394 26.300 23.788 24.725 23.913 Average 23.73 23.05 25.371

※-: Bad data

※ A powder; When the mixing ratio 6 of the inorganic powder is 100, the powder having a mixing ratio of special cement fine powder and silica is 65:35.

B powder; When the mixing ratio 6 of the inorganic powder is 100, the powder having a mixing ratio of special cement fine powder and silica is 55:45.

C powder; When the mixing ratio 6 of the inorganic powder is 100, the powder of the special cement fine powder and silica is 45:55.

As described above, the overall adhesion performance showed a uniform adhesion performance of 21-24kgf / cm2 at the early age (7 days), but the difference between each specimen increased as the age increased, especially at 14 days of age. Adhesion performance decreases in unison and increases again.

The A-type specimens had a mixing ratio of water and resin constituting the hardener 2.5 of 2.0: 0.5, and used A powder as the inorganic powder, but showed a slight increase with age after the rapid decrease of the initial age, but 20kgf / ㎠ The following adhesion performance is shown below the average value.

The B-type specimens had a mixing ratio of water and resin constituting the hardening material of 1.5: 1 (based on the hardening material 2.5), and using the A powder as the inorganic powder. The decline is slowing.

The C-type specimens had a mixing ratio of water and resin constituting a hardening material of 1: 1.5 (based on hardening material 2.5), and using A powder as an inorganic powder, and exhibited a great ups and downs in adhesion performance and a long finger age of 25 kgf / cm 2 or more. .

In the D-type specimen, the mixing ratio of water and resin constituting the hardening material is 1: 1.5 (based on the hardening material 2.5), and the B powder is used as the inorganic powder, and the adhesion performance is severe, and the long-term age is higher than 25kgf / ㎠. .

The F-type specimen has a mixing ratio of water and resin constituting the hardening material is 1: 1.5 (based on the hardening material 2.5) and uses C powder as an inorganic powder, and has a small ups and downs of adhesion performance and shows an increase with age. Higher than 25kgf / cm <2> is shown.

As described above, in the secondary test, the ups and downs of each test piece are severe depending on the age, but most of the test pieces show the adhesion performance of 15 kgf / cm 2 or more above the standard value, and when compared with the first test results, it has very excellent performance and wetting. Suitable for use in the environment.

In addition, whether or not the primer was constructed, the overall result of the specimen was evaluated to be superior to the untreated specimen under the conditions in which the primer was applied. In order to improve the adhesion performance, the primer coating may be performed.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

As described above, the present invention is to mix the inorganic powder, the hydrophilic epoxy resin base material and the hardening material in an appropriate blending ratio, regardless of the curing conditions and environmental conditions of the base material, the average adhesion performance is excellent, and the primer coating process can be omitted, the workability It is easy and excellent in acid resistance, chemical resistance and water tightness.

Claims (3)

The hydrophilic epoxy resin base material, the hardening material and the inorganic powder are blended in a ratio of 1: 2.5: 3-9, and 20 parts by weight of water is added to 100 parts by weight of the blended mixture. Excellent inorganic cross-sectional coating composition. According to claim 1; The inorganic powder coating composition having excellent adhesion to the wet surface, characterized in that the powder mixture of a special cement of 5000 cm 2 / g and silica in a mixing ratio of 45 to 65:55 to 35. According to claim 2; An adhesive reinforcing material is further added to the hydrophilic epoxy resin material, the hardening material, and the inorganic powder mixture so that the hydrophilic epoxy resin material, the hardening material, the inorganic powder, and the adhesive reinforcing material are added in a ratio of 1: 2.5: 3-9: 0.5. An inorganic cross-sectional coating composition having excellent adhesion to wet surfaces.