KR101749683B1 - Manufacturing method and composition for concrete coating curing agent with an aqueous-based lightweight material - Google Patents

Abstract

The present invention relates to a coating film curing agent for concrete using a water-based lightweight material which suppresses evaporation of water contained in unhardened concrete and suppresses cracking during curing of concrete and improves physical properties, The curing agent for the composition is prepared by forming a first liquid composed of a bonding material wax and lightweight particle beads and forming a second liquid comprising an emulsifier, an antifoaming agent, a stabilizer and water, dropping the second liquid into one liquid for about 40 to 60 minutes The present invention relates to a method and a composition for producing a coating film curing agent for concrete using a water-based lightweight material in which a film curing agent is produced by stirring at a high speed.

Description

TECHNICAL FIELD [0001] The present invention relates to a method and a composition for producing a coating film curing agent for concrete using a water-based light-

TECHNICAL FIELD The present invention relates to a composition for a concrete film curing agent for concrete using a water-based lightweight substance which suppresses the evaporation of water contained in unhardened concrete and inhibits cracking during curing of the concrete and improves physical properties .

Concrete is a construction material used by hydroponic reaction that hardens after a certain period of time after mixing with water, cement and aggregate.

Since the amount of water generally used contributes greatly to the physical properties of concrete after curing, various types of chemical products are used to reduce the amount of water used in the production of concrete. When the amount of water used is reduced, the physical properties of the concrete are improved However, when the water contained in the non-hardened concrete is evaporated due to the surrounding environment such as wind, direct sunlight, and relative humidity, it causes very serious problems such as cracks and strength deterioration.

In order to prevent evaporation of water during the curing of these concrete, it is covered with vinyl, curing, etc. Also, a liquid film curing agent is used as a chemical product.

The liquid film curing agent is a polymer substance made into a liquid phase. It is generally classified into a water-based polymer dispersed in water and a polymer dissolved in a solvent.

However, the method of preventing the evaporation of water on the surface of concrete has been suggested by rapidly inducing the surface hardening of concrete. However, most of liquid coating film curing agents currently sold use a polyester or acrylic solution in the oil phase, Wax emulsion or EVA emulsion is used.

Their method of use is to spray the liquid film curing agent on the unplasticized concrete pouring surface immediately after the concrete is laid and flattened to form a film film on the surface of the uncured concrete to suppress the evaporation of water .

Therefore, the liquid curing agent for concrete should have a viscosity enough to be sprayable for both water and oil, and the moisture retention capacity suggested by KS F 2450 should be within 0.55㎏ / ㎠. In addition, the drying time should be completely dried within 4 hours and 12 hours, but it is not possible in the past.

The prior art of this field is that the film curing agent (hereinafter referred to as "Prior Art 1 ") having a concrete surface strengthening function of the registered patent publication No. 1292174 (registered on July 26, 2013) is a polymer emulsion, a silicate, , A curing accelerator, and a surfactant.

Although the silicate used in the prior art 1 uses sodium silicate, potassium silicate, or lithium silicate as a mixture of one or more of them, sodium hydroxide (NaOH) is produced in the reaction of producing calcium silicate hydrate. Since sodium hydroxide has a high solubility in water, there is a problem that it is redissolved and eluted when moisture is present.

Therefore, the prior art 1 discloses that the surface of the concrete structure is completely closed by insolubilizing it by reacting with sodium hydroxide, and adding a silane flame which chemically reacts with the concrete component such as silicate to fill micro pores. However, The curing agent is sprayed on the surface after the concrete is poured into the concrete. The application method is spraying, spraying with a brush and brush.

Therefore, there is no way to uniformly coat the surface of the poured concrete by spraying. Therefore, in the case of Prior Art 1, since sodium hydroxide has a high solubility in water, there is a problem that when water is present, There is a problem that water is partially eluted due to irregular application at the time of coating so that imbalance and durability of the cured concrete partially differs and the durability of the cured concrete is deteriorated in the future,

As another prior art, "Aqueous film curing agent for concrete surface" (hereinafter referred to as " Prior art 2 ") of Patent Publication No. 2011-0064553 (date June 15, 2011) Wherein the styrene butadiene latex is from 35 to 75% by weight, the acrylonitrile butadiene latex is from 0 to 25% by weight, the ethylene vinyl acetate emulsion is from 15 to 35% by weight, the acrylic emulsion is from 0 to 10% by weight and the colorant is titanium dioxide (TiO2) To 5% by weight based on 100% by weight of the resin composition, 0.1 to 5% by weight of an emulsifier, 0.1 to 5% by weight of a thickener and 0.3 to 0.8% by weight of an antifoaming agent .

The prior art 2 has the advantage of using styrene butadiene latex on the basis of the resin composition by using the properties of the latex, thereby preventing deterioration and imparting the strength of the coating. However, since the coating strength is not uniform during the coating process, And a pinhole is generated in the coating itself, thereby causing a problem that the smoothness of the concrete surface is lowered.

In addition, the latex is mixed with the bleeding water of the unhardened concrete to lower the concentration, so that it can not form a film in the early stage or is absorbed into the unhardened concrete, and thus it can not contribute to the prevention of cracks in the initial curing crack of the concrete.

Korean Registered Patent No. 1292174 Korean Patent Laid-Open Publication No. 2011-0064553

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above problems, and it is an object of the present invention to provide a concrete coating film using a lightweight material which suppresses evaporation of water contained in uncured concrete, And to provide a composition and a manufacturing method of the curing agent.

Another object of the present invention is to provide a method for forming a coating film which can easily form a coating film without any time restriction after the concrete is poured and is capable of suppressing the evaporation of moisture in the concrete without being greatly affected by the surface of the concrete even if the unevenness of the surface of the non- A composition and a manufacturing method of a coating film curing agent for concrete using a lightweight material are provided.

In order to achieve the above object,

The curing agent for the concrete coating of the aqueous system,

A first liquid composed of a wax (binding substance) and a bead (light particle)

A second liquid comprising an emulsifier, an antifoaming agent, a stabilizer and water is mixed and stirred in the second liquid to form a coating film curing agent for concrete.

In the present invention, which is formed as described above, the surface of the unhardened concrete forms a very rough surface by aggregate or the like, and when the liquid coating film curing agent is sprayed, the curing agent is formed with a suitable viscosity so that the thickness of the coating is uniformly formed, Thereby preventing the occurrence of cracks and strength deterioration due to suppression of evaporation of water and water rising on the upper surface of the concrete.

Generally, the solid content of the liquid film curing agent is about 5 to 30%. If it is lower than this, the amount of polymer forming the film is too small to easily break down on the wind and prevent evaporation of water. If it is higher than 30% On the other hand, the liquid film curing agent is not spread well on the hardened concrete surface, so that the continuous film can not be formed and the water easily evaporates.

In addition, the surface of unhardened concrete forms a very rough surface by aggregates and when the liquid curing agent is sprayed, the thickness of the coating is uniformly formed only when the curing agent has a proper viscosity so that evaporation of water in the unhardened concrete can be suppressed .

In particular, roads and rooftops have slopes in order to smooth out water, and when spraying a liquid film curing agent on slopes, there is a tendency to flow down along the slopes, resulting in a lot of loss during construction and loss of the liquid film curing agent It can have an adverse effect on the environment.

The spraying point of the liquid film curing agent in construction is an important factor for suppressing the evaporation of water in the unhardened concrete. If it is sprayed immediately after the concrete is poured, the film formed on the bleeding water layer coming from the unhardened concrete may be easily broken by the wind, , The physical properties such as compressive strength and surface hardness of the cured concrete may be deteriorated.

Generally, the spraying time of curing agent is limited to when a little water remains on the surface after the concrete is poured, so many cases of liquid curing curing agent necessary in actual construction are often used. Therefore, a liquid film curing agent which can easily form a film without any time limitation after concrete pouring and can suppress water evaporation in concrete without being greatly affected by the surface of concrete such as unevenness of the surface of unhardened concrete It will be very useful value.

In order to realize this, the present invention includes a very light particulate material in a polymer so that a light material on a particle surface is floated by buoyancy to easily form a continuous film of a polymer material on the surface of the uncured concrete, The present invention provides an economical method of reducing the amount of the curing agent by reducing the amount of the liquid film curing agent penetrating into the concrete by mixing the particles with the polymer as well as suppressing evaporation of water.

The present invention relates to a liquid type film curing agent used for suppressing cracks and increasing compressive strength occurring during the construction of concrete or mortar, in which lighter particle materials and polymer materials are combined and liquefied to spray the liquid film curing agent on unhardened concrete The coating is uniformly formed on the uneven surface exposed to the upper part of the concrete and the curing agent is advantageously used in the use by not using the limitation of the bleeding number of the concrete. In addition, by forming a uniform film by combining particulate and polymer, it is possible to economically construct the existing liquid film curing agent by reducing the loss caused by flowing from the inclined surface. In particular, in case of oily type, .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing an example of a coating on a concrete uneven surface which is applied using the film curing agent of the present invention. FIG.
Fig. 2 is an exemplary view showing a coating state of the concrete surface applied using the film curing agent of the present invention. Fig.

Hereinafter, embodiments of the present invention will be described in detail.

In general, liquid curing agents for concrete are light silica particles such as hollow silica beads, polymer beads, styrofoam powder, natural silica powders such as senosphere, polyurethane powder, waste polyurethane or waste tire powder having a specific gravity of 1 Materials that are lighter than water and can float in water and film-forming materials such as paraffin wax, acrylate, EVA and silica are first mixed and then dispersed evenly in solvents and water to complete the invention.

At this time, as materials capable of forming a film, inorganic materials such as a polymer material and a silicate material may be possible.

However, polymeric materials are advantageous for forming the film, and in the case of the inorganic bonding material, it may be somewhat disadvantageous because it is involved in the reaction with the cement to form a film due to reaction induction on the cement surface.

The polymer material and the particulate lightweight material should be mixed at an appropriate ratio. The mixing ratio is suitably 1: 0.1 to 1:10 in terms of the volume ratio of the particulate material to the bonding material. When the volume ratio is less than 1: 0.1, the amount of the bonding material is too small to form a continuous film when sprayed on concrete. If it is larger than 1:10, the economical efficiency may become worse or become similar to existing products.

The volume ratio of the preferred particulate: binder is 1: 0.5 to 1: 5. It is preferable to use a lightweight material having a density of 0.1 to 0.99 g / cm 3. If it is less than 0.1, it is difficult to make the product difficult to form or stable in a uniform dispersion state with the binder material. If the material is 0.99 or more, Film particles and bonding materials do not float rapidly and film formation is not smooth.

In addition, the density of the present invention, which is a mixture of the lightweight material and the bonding material on the particles, is preferably 0.2 to 0.95 g / cm 3, and when it is 0.2 or less, the storage stability is poor. When it is 0.95 or more, It is difficult to suppress.

The solid content of the finished product is suitably from 5 to 40%. If the solid content is less than 5%, film formation is difficult. If it is larger than 40%, if it is difficult to spray or sprayed on unhardened concrete, spreadability may be poor and it may be difficult to form a film.

However, it can be manufactured by raising the viscosity or concentration and diluted with water or solvent. It can be used based on the concentration at the time of spraying, and the above criteria are included in the above limitation. In addition, when white pigment such as peroxide is used for the bonding material or the lightweight particle material, the light reflectance can be increased to suppress crack development due to direct sunlight.

The constitution of the material of the liquid film-forming curing agent using the light-weight particulate matter and the bonding material such as the polymer for completing the present invention and the manufacturing method thereof are described in more detail in the examples.

<Examples>

The first liquid and the second liquid are prepared and mixed by constituting the first and second embodiments with the scheme shown in Table 1 below.

Example 1

(A) The wax is completely dissolved by raising the temperature of the wax of 25.6% by weight as a binding substance of the first liquid to 80 ° C, and 4.6% by weight of bead powder as lightweight particles is added so that the powder is completely dispersed in the wax to prepare a first liquid .

(B) The second solution is prepared by making 8.9% by weight of emulsifier, 1.0% by weight of defoamer, 0.8% by weight of stabilizer and 59.4% by weight of water and dropping it in 80 ° C. for about 40 to 60 minutes. Followed by stirring to complete a milky liquid curing agent for concrete.

Example 2

(A) 22.6% by weight of wax as a binding material of one liquid is heated up to 80 ° C to completely dissolve the wax, and 8.2% by weight of lightweight particles of styrofoam powder is added so that the powder is completely dispersed in the wax to prepare a first liquid.

(2) The two liquids were prepared in an amount of 8.9% by weight of an emulsifier, 0.1% by weight of an antifoamer, 0.8% by weight of a stabilizer and 59.4% by weight of water, stirring the mixture at a high speed while dropping it in a liquid maintained at 80 ° C for about 40 to 60 minutes, The concrete curing agent for concrete was completed.

When the above Example 1 or Example 2 is carried out, the stirring speed may affect the dispersion stability of the particles, and the stirring speed is preferably 1300 rpm to 20,000 rpm. Preferably 15,000 rpm. If the number of revolutions is less than 1,300, the particles of the dispersed phase produced are too large and the storage stability is deteriorated. If the rotation number is larger than 20,000 rpm, the particles may be broken.

The emulsifier may be an emulsifier generally used in emulsion polymerization. The amount of the emulsifier to be used is suitably from 0.1 to 10%. If it is less than 0.1%, the stability of the emulsion is deteriorated. If it is more than 10%, the emulsified invention may have a bad influence on the concrete, or the foam may be generated.

The antifoaming agent may be selected from silicone, alcohol, fatty acid, oil, and the like. The amount of the antifoaming agent is preferably 0.01 to 5%, more preferably 0.1 to 4%. If it is smaller than 0.01%, the bubble effect may occur due to a small bubble effect, and if it is larger than 5%, it is not economical.

The stabilizer is used to stabilize the emulsion system and may be used in an emulsion such as an amine or amide system. The amount of the stabilizer used is 0.1 to 5%, preferably 0.1 to 4%, and more preferably 5% When emulsion stability is poor, the emulsion is destroyed during the winter or long-term storage, and the polymer and particles and water can be separated from each other after coagulation.

Table 1 shows the mixing ratio of the composition of the coating film curing agent for concrete using the lightweight material of the present invention and the cogent composition. In Example 1, the first solution was prepared by mixing the lightweight particle beads with the binder wax, In Example 2, a light curing curing agent was prepared by mixing light-weight particulate styrofoam powder with a wax which is a binder and a first liquid.

The liquid film curing agent of the present invention prepared in Examples 1 and 2 of the present invention is a water curing agent generally used when the same amount of liquid film curing agent is used in Example 1 using lightweight particulate material The ability of water evaporation to be lowered to 0.45 as compared with the capacity of 0.54). This indicates that when the same amount is used, the film curing agent of the present invention has lower water evaporation than the water-based curing agent of the general curing agent used, and thus has a better curing effect.

In the case of Examples 1 and 2 of the present invention, there was no occurrence of cracks, whereas in the case of general merchandise, 8 cracks were found in the upper part of the slope in the case of ordinary water.

Therefore, when the present invention is used, it is possible not only to suppress cracks on the slopes, but also to suppress the occurrence of cracks due to evaporation on the concrete surface having a large irregularity, as well as to reduce the amount of use, thereby achieving both economy and environment friendliness.

delete

 In the examples of the present invention, the test method is concrete of KS F 2540, and the general aqueous test was conducted by using a product of a commercial product S company.

At this time, the number of cracks on the slope was determined by counting the number of cracks after 7 days after spraying the mortar on KSF 2540 according to the usage amount of the liquid film curing agent in the area of 1 m ² formed with 15 ° slope.

Generally, the spraying time of curing agent is limited to when a little water remains on the surface after the concrete is poured, so many cases of liquid curing curing agent necessary in actual construction are often used. Therefore, it is an object of the present invention to provide a liquid coating film capable of easily forming a coating film without a specific time limit after concrete is laid and capable of suppressing moisture evaporation in the concrete without being greatly affected by the surface of the concrete, The curing agent is highly valuable.

The present invention is based on the inclusion of a very light particulate material in a polymer so that a light material on the particle surface is floated by buoyancy to easily form a continuous film of the polymer material on the surface of the unreinforced concrete to thereby suppress the evaporation of water The present invention also provides an economical method of reducing the amount of the curing agent by reducing the amount of the liquid curing agent penetrating into the concrete by mixing the particles and the polymer.

In addition, the present invention is a material having a specific gravity smaller than 1, such as hollow silica beads, polymer beads, styrofoam powder, natural silica powder such as Senosphere, polyurethane powder, waste polyurethane or waste tire powder, It is a material that can come to mind well.

When a liquid film curing agent is prepared by mixing such a substance with a polymer, the particles and the polymer material can be formed as a bleeding water level of the concrete to easily form a coating.

Particularly, even when aggregate exists on the casting surface of concrete, the uneven surface (FIG. 1) existing evenly differs according to the polarity of water and air to form a film with a certain thickness on the surface, It is a completely different behavior. With this mechanism, the application is easy at any time regardless of the number of bleeding in the concrete and the presence of the uneven surface, so that the user does not have to wait for a suitable concrete time to spray the liquid curing agent.

In addition, the thickness of the film of the liquid curing agent is closely related to the amount of floating, so that when the amount is constant, the thickness of the film is kept constant so that the water evaporates in the unreinforced concrete effectively, It helps to suppress the occurrence.

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 as defined in the appended claims. It is to be understood that both the technical idea and the technical spirit of the invention are included in the scope of the present invention.

10: coating curing agent application surface 20: concrete installation surface

Claims (5)

The curing agent for the concrete coating of the aqueous system,
The wax as the binding material is heated to 80 DEG C to completely dissolve the wax, and the bead powder or the styrofoam powder as the lightweight particle is added so that the powder is completely dispersed in the wax to form the first liquid,
A second liquid comprising an emulsifying agent, an antifoaming agent, a stabilizer and water is prepared and then the second liquid is dropped in the first liquid for 40 to 60 minutes while stirring at a high speed at a stirring speed of 1,300 rpm to 20,000 rpm to prepare a film curing agent A method for manufacturing a coating film curing agent for concrete using a lightweight water-based material.
delete delete 25.6% by weight of wax as a binder of the first liquid was heated to 80 DEG C to completely dissolve the wax, and 4.6% by weight of bead powder as lightweight particles was added so that the powder was completely dispersed in the wax The first liquid,
Wherein the composition is prepared by mixing a first solution containing 8.9% by weight of an emulsifier, 1.0% by weight of a defoamer, 0.5% by weight of a stabilizer and 59.4% by weight of water in a first liquid.
A coating film curing agent for concrete using an aqueous resin lightweight material comprising the composition of claim 4.

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