KR20130023961A - Aqueous membrane curing composition for surface reinforcement functions of concrete - Google Patents

Abstract

PURPOSE: A membrane curing agent with a concrete surface enhancement function is provided to prevent water evaporation by a water soluble polymer emulsion, and to reinforce surface intensity by the complementary action of silicate and fluosilicate. CONSTITUTION: A membrane curing agent with a concrete surface enhancement function comprises a polymer emulsion, silicate, fluosilicate, a curing accelerator, and a surfactant. The membrane curing agent contains 10-100.0 parts of mixture by weight containing the silicate and the fluosilicate, 0.5-3 parts of curing accelerator by weight, and 0.1-1 part of surfactant by weight for 100.0 parts of polymer emulsion by weight. The weight ratio of the silicate and the fluosilicate is 5-15:2-4. The polymer emulsion is composed of a mixture with one or more than two compounds selected from an acrylic resin emulsion, a paraffin emulsion, a latex polymer emulsion, and a polyvinyl resin emulsion. The fluosilicate is composed of a mixture with one of more compounds selected from zinc fluosilicate, copper silicofluoride, magnesium silicofluoride, nickel silicofluoride, lithium silicofluoride, iron silicofluoride, and cobalt silicofluoride.

Description

Film curing agent with concrete surface strengthening function {AQUEOUS MEMBRANE CURING COMPOSITION FOR SURFACE REINFORCEMENT FUNCTIONS OF CONCRETE}

The present invention relates to a film curing agent capable of inhibiting water evaporation and surface strength of concrete structures, and in more detail, it can suppress water evaporation based on a water-soluble polymer emulsion, and at the same time, mutual interaction between silicate and silicate salts. It is related to the film curing agent that can enhance the surface strength based on the complementary action to improve the durability of the concrete structure surface.

In order to fully exhibit the performance of cement structures such as mortar and concrete, curing methods that suppress moisture loss from the cement surface have been conventionally used. Generally, arithmetic curing, coating curing, and sheeting are commonly used. Curing methods are used.

However, arithmetic curing needs to increase the number of arithmetic at high temperature and high evaporation rate, and the work becomes complicated. Sheet curing needs to increase sheets according to construction area, and it is difficult to cope with the complexity of form. have.

In addition, coating film curing is mainly based on resins such as epoxy, acrylic, urethane, etc. These include solvents or two-component types, which are complicated to use, and the coating is relatively hard, making it difficult to conform to deformation of concrete structures.

Japanese Laid-Open Patent Publication No. 2004-244255 discloses a coating film curing agent made of an aqueous solution containing cellulose. Japanese Laid-Open Patent Publication No. 2005-162534 discloses a curing coating made of an aqueous resin dispersion. Although these are all insufficient in inhibiting water evaporation, Korean Patent Publication No. 2010-0007709 discloses a coating curing agent for cement structures having excellent water evaporation inhibiting effect, but it contains a solvent as an oily component or a method for handling dangerous substances. There is a problem with regulation.

On the other hand, concrete surface strengthening agent is infiltrated into the concrete surface to fill the pores and microcracks, and many products have been proposed for the purpose of preventing the breakage of concrete by inhibiting the penetration of moisture and salt.

For example, Korean Patent Publication No. 2003-74180 discloses an inorganic hardening additive consisting of sodium carbonate, potassium chloride, ammonium chloride, borax, and distilled water, but the effect of strengthening concrete surface is insufficient, and Korean Patent Registration No. 0475514 Surface strengthening agents made of silicate magnesium, zinc oxide, acrylic polymers and the like have been proposed. However, such a surface strengthening agent uses acidic silicate magnesium fluoride and zinc oxide, so that there is a problem of promoting whitening on the concrete surface.

The improvement of the existing concrete film curing agent and surface hardener has been continuously demanded, and the interest in the film curing agent and the surface hardener is increasing, but the concept that the water retention of the film curing agent and the wettability of the surface hardener are in conflict. Due to this, a film curing agent that simultaneously improves the effect of the film curing and the surface strengthening effect has not been proposed.

Accordingly, the present invention is to provide a film curing agent that can strengthen the surface strength at the same time as the film curing of the surface of the concrete structure.

In order to achieve the above object, the film curing agent having a concrete surface strengthening function of the present invention comprises a polymer emulsion, a silicate, a silicate salt, a curing accelerator, and a surfactant, which is coated or dispersed on the surface of the concrete structure, and thus the film function and surface In other words, the reinforcing function, that is, to suppress the evaporation of water on the surface of the concrete structure and to have a concrete surface reinforcing function.

The film curing agent having the concrete surface strengthening function of the present invention is to give the coating function through the polymer emulsion of the aqueous component and at the same time to exhibit the surface strengthening effect by the silicate and silica fluoride salt mixture.

The polymer emulsion, which is one component of the present invention, is applied to the surface of a concrete structure by dispersing the water-soluble polymer in water by using a water-soluble polymer, thereby forming a polymer film according to water evaporation, thereby suppressing water evaporation from the surface of the cement particles. Let's do it. That is to prevent the surface moisture evaporation by such a polymer emulsion to perform the film function.

The polymer emulsion may be a mixture of one or two or more of an acrylic resin emulsion, a paraffin emulsion, a latex polymer emulsion, and a polyvinyl resin.

On the other hand, in the present invention, the mixing of the polymer emulsion suppresses the evaporation of water on the surface of the concrete structure, but the polymer emulsion is weak in enhancing the strength of the surface itself, such as enhancing the wear resistance of the surface due to penetration into the surface. Incorporating a mixture of silicate and silicate salt in the polymer emulsion is intended to improve the surface strength itself of the concrete structure.

The silicate produces calcium silicate hydrate through the reaction with calcium hydroxide produced during the cement hydration reaction on the surface of the concrete structure, and the resulting calcium silicate hydrate is filled in the micropores on the surface of the concrete structure, thus providing a dense surface structure. It will strengthen the surface strength itself.

Such silicates are appropriate to use a mixture of one or more of sodium silicate, potassium silicate, lithium silicate.

By the way, the sodium hydroxide (NaOH) is produced in the production reaction of calcium silicate hydrate, so the sodium hydroxide is solubilized in water, there is a problem that is dissolved again and dissolved in the presence of water. Therefore, by insolubilizing by reacting with sodium hydroxide, and adding a fluorinated salt that chemically reacts with concrete components such as silicate to fill micropores, the surface of the concrete structure is completely closed. In other words, silicic fluoride reacts with calcium hydroxide produced during the cement hydration reaction on the surface of the concrete structure to create insoluble fine particles to fill the micropores on the surface of the concrete structure, thereby improving the surface strength of the concrete structure such as wear resistance.

It is appropriate to use such a mixture of one or two or more of zinc fluoride, copper fluoride, magnesium fluoride, nickel fluoride, lithium fluoride, iron fluoride, and cobalt fluoride.

In the present invention, the blending ratio of the polymer emulsion and the silicate and silicate salt mixture is limited to 10 to 100 parts by weight of the silicate and silicate salt mixture relative to 100 parts by weight of the polymer emulsion, and the content of the polymer emulsion in the silicate and silicate salt mixture is within such limited range. If exceeded, the remainder of the polymer film becomes excessive, and if the content of the polymer emulsion is less than this limited range, there is a problem in that the moisture evaporation suppression performance is deteriorated and thus limited.

In addition, limiting the mixture of the silicate and the silicate salt as described above, if the content of the mixture exceeds 100 parts by weight does not penetrate into the concrete surface, there is a problem that remains, and if less than 10 parts by weight of the surface strengthening effect is thus insufficient It is preferable to limit.

In addition, in the silicate and silicate salt mixture blended as described above, the mixture ratio of silicate and silicate salt is characterized in that the silicate: silicate salt = (5 ~ 15): (2 ~ 4) by weight ratio.

In order to facilitate the penetration of the above-mentioned mixture of silicate and silicate salts into the concrete structure surface, it is reasonable that the surfactant is formulated in the present invention. That is, the silicate and silicate salts are to be stably mixed with the polymer emulsion and to facilitate penetration into the surface of the concrete structure. It is reasonable to use a mixture of one or two or more of polyoxyethylene nonyl phenol ether and polyoxyethylene higher alcohol ether. The content of such a surfactant is appropriately limited to 0.1 to 1 parts by weight based on 100 parts by weight of the polyemulsion. Such a limitation cannot be expected to improve the permeability when formulated at less than 0.1 part by weight, and if it exceeds 1 part by weight, it is reasonable to use it in such a way that the contribution to the permeability improvement is almost the same as when formulated below.

In addition, in the present invention, as the polymer emulsion is used, cement curing may be delayed, which may cause a decrease in strength. Therefore, it is appropriate to further mix the inorganic or organic curing accelerator. These curing accelerators may be selected from sodium carbonate, potassium carbonate, calcium carbonate, sodium nitrate, potassium nitrate, calcium nitrate, sodium nitrite, potassium nitrite, calcium nitrite, sodium sulfate, potassium sulfate, calcium sulfate, monoethanolamine (MEA) and triethanolamine (TEA) or It is preferable to use a mixture of two or more, and it is reasonable that the formulation is formulated in the range of 0.5 to 3 parts by weight of the curing accelerator relative to 100 parts by weight of the polymer emulsion. If the blending amount exceeds 3 parts by weight, a retardation action occurs, and the surface strength is lowered. If the amount is less than 0.1 part by weight, the effect of hardening promotion is insignificant.

In addition, the present invention, in addition to 10 to 100 parts by weight of a mixture of silicate and silicate salt, 0.5 to 3 parts by weight of curing accelerator, 0.1 to 1 part by weight of surfactant, based on 100 parts by weight of the polymer emulsion as mentioned above, ammonia, calcium phosphate In addition, it is preferable to add 0.1 to 1 parts by weight of a mixture of one or two or more of sodium phosphate and potassium hydroxide in aqueous solution, and by further adding a Ph regulator, the pH of the entire film curing agent is preferably limited to 9 to 12. .

The coating curing agent of the present invention blended as described above is constructed by being applied or dispersed on the surface of the concrete structure. As a method for applying or dispersing the coating curing agent of the present invention on the surface of the concrete structure, a conventional method may be used. For example, in the case of application, a brush or a roller that can be applied to the surface of the concrete structure may be used. In the case of spraying, a push-pump injector or a mechanical injector may be used.

The film curing agent having the concrete surface strengthening function of the present invention forms a film which suppresses water evaporation on the surface of the concrete structure by an aqueous polymer emulsion, and forms a dense structure on the surface of the concrete structure based on a mixture of silicate and silicate salts. By doing so, there is an advantage that can strengthen the surface strength.

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

Examples 1 to 23 and Comparative Examples 1 to 4 were prepared by uniformly mixing the components shown in Tables 1 and 2 to prepare a coating curing agent, and measured the water loss amount, concrete resilience hardness and adhesive strength for the sample thus prepared It was.

-. Moisture loss: measured according to the Korean Industrial Standard KS F 2406 test method for repairability of concrete curing materials.

-. Concrete resilience hardness: Kneaded concrete (standard 25-24-150) was molded using a mold of 30 ㅧ 20 ㅧ 10cm and cured in a constant temperature and humidity room at 60 ° C of 20 ° C for 24 hours. After demolding, the film curing agent was applied to the surface of the concrete sample 200g / ㎡. Rebound hardness was measured using Schmidtham on 28th day of curing in a constant temperature and humidity room at 20 ° C 60% RH.

-. Adhesion strength: The above concrete samples were prepared according to the Korean Industrial Standard KS F 2403 concrete strength test specimen manufacturing method using a 10 cm diameter cylinder mold. After curing for 8 hours in a constant temperature and humidity room at 20 ° C. 60% RH, the coating agent was coated with 200 g / m 2. One day after application, the mortar was plastered and measured with dry adhesive strength at 7 and 28 days of curing age in a constant temperature and humidity room at 60 ° C.

Yes Polymer emulsion (parts by weight)
Surface Strength Enhancer Curing accelerator (part by weight) Surfactants
(Parts by weight) Water loss
(g / m 2) Compressive strength due to rebound hardness (MPa) Adhesive strength (MPa) Gulate (part by weight) Silica Flame (parts by weight) 7 days 28 days Example 1 10 5 2 One 0.5 548 21.9 1.6 2.2 Example 2 10 2 One 〃 543 22.5 1.8 2.3 Example 3 15 2 One 〃 542 23.4 2.0 2.7 Example 4 20 2 One 〃 542 22.0 1.8 2.2 Example 5 20 5 0 0 〃 512 22.3 1.4 1.8 Example 6 10 0 0 〃 514 22.8 1.6 2.0 Example 7 One 〃 508 23.0 1.7 2.2 Example 8 2 〃 512 23.1 1.8 2.2 Example 9 2 0 〃 510 23.2 1.9 2.5 Example 10 One 〃 504 23.5 1.9 2.6 Example 11 2 〃 497 23.7 2.0 2.7 Example 12 4 0 〃 504 23.5 2.2 2.7 Example 13 One 〃 505 23.9 2.4 2.9 Example 14 2 〃 510 24.2 2.2 2.8 Example 15 15 0 One 〃 501 24.3 1.8 2.5 Example 16 2 One 〃 498 24.9 2.3 3.1 Example 17 4 One 〃 497 25.2 2.3 3.3 Example 18 6 One 〃 497 24.9 2.2 3.1

Yes Polymer emulsion (parts by weight)
Surface Strength Enhancer Curing accelerator (part by weight) Surfactants
(Parts by weight) Water loss
(g / m 2) Compressive strength due to rebound hardness (MPa) Adhesive strength (MPa) Gulate (part by weight) Silica Flame (parts by weight) 7 days 28 days Example 19 30 5 2 One 0.5 473 23.6 2.2 3.0 Example 20 10 2 One 〃 467 24.6 2.5 3.2 Example 21 15 2 One 〃 469 25.4 2.5 3.3 Example 22 40 5 0 One 〃 442 23.4 2.2 2.9 Example 23 2 One 〃 438 23.8 2.5 3.3 Comparative Example 1 10 - - - - 594 20.6 0.7 1.2 Comparative Example 2 20 - - - - 541 21.1 0.8 1.2 Comparative Example 3 30 - - - - 506 21.8 1.0 1.5 Comparative Example 4 40 - - - - 462 22.0 1.1 1.7 Reference Example - - - - - 821 17.7 0.5 0.9

As shown in Table 1 and Table 2, when only the polymer emulsion is blended in the case of Comparative Examples 1 to 4, it can be seen that the water loss decreases as the blending amount is increased from 10 parts by weight to 40 parts by weight, and the compressive strength and the adhesive strength are as follows. It can be seen that the basic properties are improved by increasing.

However, when comparing the comparative example and the example, it can be seen that when the silicate and silicate salt are mixed in the polymer emulsion as in the example, the amount of water loss is further reduced, compared to the case where only the polymer emulsion is blended as in the comparative example. It can be seen that the basic physical properties are further improved by increasing the adhesive strength.

As mentioned above, when the mixture of silicate and silicate salt is compounded, the surface structure is enhanced because the surface of the concrete structure is made tight and the compound by the mixture of silicate and silicate salt is cemented. By penetrating the pores, the amount of water loss is reduced, and the adhesion strength is also enhanced.

On the other hand, in the case of mixing only silicate and in the case of mixing the silica fluoride salt with silicate, compared with Example 22 and Example 23, in the case of Example 22, 5 parts by weight of silicate, 1 part by weight of curing accelerator 40 parts of the polymer emulsion And 0.5 parts by weight of surfactant, and in contrast to Example 23, the same formulation as in Example 22, but 2 parts by weight of silicate salt.

From the experimental results of this embodiment, it can be seen that the amount of water loss in Example 23 is reduced compared to Example 22, the compressive strength due to the rebound hardness increases, and the adhesive strength also increases. The reason is that the silicate produces calcium silicate hydrate during the cement hydration reaction on the surface of the concrete structure, and the calcium silicate hydrate thus formed is filled in the micropores to enhance the surface strength of the concrete structure. Sodium has a problem of elution, so that siliceous salt reacts with sodium hydroxide to insolubilize it, and also reacts with calcium hydroxide to produce insoluble fine particles to fill the micropores of concrete surface. The strength seems to complement each other.

In addition, in the case of mixing the silicate and the silicate salt at the same time when comparing the appropriate weight ratio Examples 1 to 3 and Example 4 compared to Examples 1 to 4 in the case of fixing the silicate salt to 2 parts by weight and silicate 5, 10, As a result of mixing 15, 20 parts by weight of the sample, the experimental results show that when the amount of silicate is 5, 10, or 15, the moisture loss decreases as the amount of silicate is increased, and the compressive strength and adhesive strength due to the rebound hardness increase. It can be seen that. However, in the case of 20 parts by weight of silicate, the amount of water loss remains the same, but it can be seen that the compressive strength and the adhesive strength due to the resilience are rather reduced.

This is because silicate produces calcium silicate hydrate during cement hydration reaction on the surface of concrete structure, but in addition to elution, sodium hydroxide is eluted. It seems to decrease.

In addition, when comparing Examples 16 to 18, respectively, in the case of Examples 16 to 18, the sample was fixed with 15 parts by weight of silicate and 2, 4, and 6 parts by weight of silicate salt. In the case of 4, the loss of water decreases as the amount of the silica fluoride increases, and the compressive strength and the adhesive strength due to the rebound hardness increase. However, when the silica fluoride salt is 6 parts by weight, the amount of water loss remains the same, but it can be seen that the compressive strength and the adhesive strength due to the rebound hardness decrease rather.

According to the above experiment, the optimum weight ratio in the case of mixing the silicate and the silicate salt at the same time is determined to be silicate: silicate salt = 15: 4.

As a result, as shown in the above experimental example, the water-soluble polymer emulsion can suppress the evaporation of water on the surface of the concrete structure, and the silicate and the silica fluoride can enhance the surface strength of the concrete structure. By adding a surfactant and a curing accelerator to the composition, it is possible to reduce the amount of water loss on the surface of the concrete structure and to improve the compressive strength and the adhesive strength due to the resilience hardness.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

Claims (9)

A film curing agent having a concrete surface strengthening function, comprising a polymer emulsion, a silicate, a silicate salt, a curing accelerator, and a surfactant.
The method of claim 1,
10 to 100 parts by weight of a mixture of silicate and silicate salt, 0.5 to 3 parts by weight of a curing accelerator, and 0.1 to 1 part by weight of a surfactant, based on 100 parts by weight of the polymer emulsion.
The method of claim 2,
The silicate and silicate mixture is a film curing agent having a concrete surface strengthening function, characterized in that the weight ratio of silicate: silicate = (5 ~ 15): (2 ~ 4).
The method of claim 1,
The polymer emulsion is a film curing agent having a concrete surface strengthening function, characterized in that composed of one or two or more of the acrylic resin emulsion, paraffin emulsion, latex polymer emulsion, polyvinyl resin emulsion.
The method of claim 1,
The silicate is a film curing agent having a concrete surface strengthening function, characterized in that consisting of a mixture of one or two or more of sodium silicate, potassium silicate, lithium silicate.
The method of claim 1,
The silica fluoride salt is a film having a concrete surface strengthening function, characterized in that composed of a mixture of one or more of zinc fluoride, copper fluoride, magnesium fluoride, nickel fluoride, lithium fluoride, iron fluoride, cobalt fluoride Curing agent.
The method of claim 1,
The curing accelerator is one of sodium carbonate, potassium carbonate, calcium carbonate, sodium nitrate, potassium nitrate, calcium nitrate, sodium nitrite, potassium nitrite, calcium nitrite, sodium sulfate, potassium sulfate, calcium sulfate, MEA (monoethanolamine) and TEA (triethanolamine) A film curing agent having a concrete surface strengthening function, characterized in that composed of two or more mixtures.
The method of claim 1,
The surfactant is a film having a concrete surface reinforcing function, characterized in that composed of a mixture of 1 or more of sodium dodecylbenzenesulfonate, higher alcohol sodium sulfate, sodium olefinate, polyoxyethylene nonyl phenol ether, polyoxyethylene higher alcohol ether. Curing agent.
The method of claim 2,
An ammonia, calcium phosphate, sodium phosphate, and 0.1 to 1 parts by weight of a mixture of at least two or more mixtures of aqueous solution of potassium hydroxide, wherein the film curing agent having a concrete surface strengthening function, characterized in that 9 to 12.