KR20050081517A - Inorganic sealer for protection of concrete and porous substrates - Google Patents

Abstract

1) 50 to 90 parts by weight of partially hydrolyzed and controlled ethyl silicate monomer; 2) 5 to 50 parts by weight of any one organic silicone compound selected from the group consisting of hydrophobic silane, oligomeric siloxane, and low molecular weight polysiloxane; And 3) 10 to 50 parts by weight of an organic solvent selected from the group consisting of glycol ethers, hydrocarbons, glycol ether esters, and C _{1 to} C ₄ alcohols, and inorganic surfaces of porous concrete structures using the same. It relates to a penetrant. In addition, the surface penetrant of the present invention may further comprise 0.05 to 0.5 parts by weight of the surfactant. Unlike the conventional surface penetrant for concrete, the surface penetrant of the present invention induces chemical bonding to the concrete surface to impart hydrophobicity, penetrates deeply into the concrete, prevents water intrusion from the outside, and smoothly breathes concrete. This is possible.

Description

Inorganic surface penetrants for concrete and porous concrete structures using them {INORGANIC SEALER FOR PROTECTION OF CONCRETE AND POROUS SUBSTRATES}

The present invention relates to an inorganic surface penetrant of concrete and a porous concrete structure using the same, and more particularly, the present invention relates to an inorganic surface penetrant for concrete and an inorganic surface penetrant which stays on the concrete surface for a long time by inducing a chemical bond on the concrete surface. The present invention relates to an inorganic surface penetrant that can penetrate deep into the porous concrete structure.

Today, many current concrete and porous concrete structures using inorganic materials are weakened in durability due to various environmental factors, in particular chlorine or moisture, and their service life is rapidly reduced.

The environmental factors include the effects of acid rain due to automobile exhaust gas, adhesion of contaminants such as dust, and the organic synthetic polymer-based coating or finishing materials that obstruct the respiration of concrete, thereby aging concrete structures, Yellowing, choking, swelling, cracking, dropping, and other defects can lead to early corrosion of reinforced concrete structures.

In particular, the chlorine component penetrated into the concrete by seawater or salt to prevent freezing acts as another cause to corrode the steel. In addition, moisture in the air or water used when using concrete causes freeze-thawing phenomenon or lifting and swelling of the finishing material when present on the concrete surface. In addition, when filling the capillary porosity (caused by the excess water introduced when mixing the concrete paste), and leaving the capillary pores continuously, water and other liquid substances continuously penetrate and eventually cause corrosion of the concrete.

Various efforts have been made to repair the concrete structure due to aging, and typically, an organic synthetic resin such as epoxy or urethane or cement, sand, silica, etc. are mixed with such organic synthetic resin and applied to the surface of reinforcing steel which has been removed from rust. There is a method of watertightly filling the missing part.

In addition, liquid penetrants are used to improve the durability of concrete and porous structures such as bricks or blocks. Recently, as a liquid surface penetrating agent, the inorganic material is applied to the surface of an inorganic material such as concrete to obtain salinity. Or to reduce the influence of water and in particular, to form a hydrophobicity in the surface layer to control the moisture content. Thus, there has been a focus on the study of materials providing hydrophobicity and representative materials providing hydrophobicity include silane, alkylalkoxy silane, silanol, siloxane, oligomeric siloxane, polysiloxane and the like.

For example, Korean Patent No. 2002-3714 discloses dissolving 1-30% of at least one silane compound of an organoalkoxysilane or organoacetoxysilane in an acidic or neutral aqueous solution, and then dissolving water-soluble lithium silicate in this aqueous solution. At least one silicate compound of water-soluble potassium silicate and water-soluble sodium silicate is dissolved by adding 0.5-20% of the aqueous solution to adjust the aqueous solution to an alkaline phase of pH 11-12 and zinc oxide, aluminum antimony oxide, and 0.5-15% of at least one metal oxide of tungsten oxide is dissolved to provide an inorganic building material protection agent. However, the lithium silicate, which is known to have the best water resistance, easily reacts with corrosive gases such as sulfurous acid gas, and protects inorganic building materials, but has a high alkalinity and a low affinity with organic compounds. Facilitate the dropping of finishes mainly composed of organic compounds applied for the restoration or protection of metals.

In another example, a silicone-based permeable waterproof composition comprising 50 to 80 parts by weight of a low molecular weight alkoxy silane, 200 to 300 parts by weight of an organic solvent and 20 to 50 parts by weight of a water repellent enhancer is known. [Korean Patent No. 2002-90434].

In addition, German Patent No. 2356142 discloses organic polysilanes or organic siloxanes having aryl or alkyl groups containing 8 carbon atoms to provide a hydrophobic surface and alcohols such as methanol, ethanol, n-propanol or isopropanol; Ketones such as methyl ethyl ketone, toluene, xyrrole, trimetalbenzol and diacetone alcohol; And solvents such as chlorine-substituted hydrocarbons such as trichloroethylene and cyclohexanone. However, the present invention has a low adhesion between the composition and the concrete, it is pointed out the problems of intrinsic property deformation and color change when applied to the actual concrete structure. Therefore, a method of adding a montmorillonite type to improve adhesion with a glass solvent is known [European Patent No. 177 824], and US Pat. No. 5782961 discloses silane and / or siloxane as bentonite or in a solvent-free condition. Clays such as montmorillonite have been mixed to suggest a penetrant on the gel.

However, conventional surface penetrants merely form a film on the surface of the building material, do not form any chemical bonds with the building material, and have a defect such as insufficient initial water repellency or poor long-term durability.

Therefore, in order for the surface penetrating agent of the porous concrete structure to achieve a long-term protective effect and to provide adequate moisture conditions to the surface-treated surface outer layer, the surface penetrating agent must penetrate as deeply as possible into the concrete structure.

Accordingly, the present inventors attempted to cure the aging phenomenon of the concrete structure fundamentally and to improve the durability, and as a result, chemical bonding between hydrophobic materials such as conventional silanes and silicon compounds and ethyl silicate partially hydrolyzed and controlled. It provides a surface penetrant that can penetrate deep into the concrete surface while inducing it for a long time, and the surface penetrant penetrates deeply into the microcracks between the capillary pores and the interface inside the concrete to prevent moisture intrusion from the outside. By confirming the smooth breathing of concrete, the present invention was completed.

An object of the present invention is to induce a chemical bond between the hydrophobic material of the conventional silane-based and silicon compounds and partially hydrolyzed and controlled ethyl silicate to stay on the concrete surface for a long time and to penetrate deeply into the concrete and concrete structure using the same It is to provide a protective surface penetrant.

More specifically, the concrete and the surface penetrating agent for protecting the concrete structure using the same, any one selected from the group consisting of 1) partially hydrolyzed ethyl silicate monomer and 2) hydrophobic silane, oligomeric siloxane and low molecular weight polysiloxane By inducing a chemical bond with the organic silicone compound of the hydrophobicity to the concrete surface to give a long time to stay, at the same time glycol ether, hydrocarbon-based, glycol ether ester; And by further comprising one organic solvent or a surfactant selected from the group consisting of C _{1 to} C ₄ alcohol, it is possible to penetrate deeper into the concrete by lowering the surface tension of the liquid surface penetrating agent.

Inorganic surface penetrants of the present invention include: 1) 50 to 90 parts by weight of partially hydrolyzed ethyl silicate monomer; And 2) 5 to 50 parts by weight of any one organic silicone compound selected from the group consisting of hydrophobic silanes, oligomeric siloxanes and low molecular weight polysiloxanes, and 3) glycol ethers, hydrocarbons, C _{1 to} C ₄ alcohols. It comprises 10 to 50 parts by weight of one organic solvent selected from the group consisting of.

In addition, in order to penetrate deep into the interior of the surface penetrant of the present invention, the surfactant may further comprise 0.05 to 0.5 parts by weight of the surfactant, when the inorganic surface penetrant of the present invention is applied to the surface, the surface active agent of the surface tension of the liquid Lower to allow deeper penetration into the concrete.

Conventional surface penetrants contain a hydrophobic material in a solvent or carrier, and when applied to a concrete surface with a high moisture content by a brush or a spray method, mutual adhesion is weak, and the solvent is evaporated in the process of penetrating the surface penetrant. There is a disadvantage to disturb.

Therefore, in order to achieve the purpose of deeply penetrating the hydrophobic material into the concrete, the present invention simultaneously includes a hydrophilic material capable of chemically bonding with the hydrophobic material on the concrete surface, and further adds a surfactant that lowers the surface tension of the liquid phase Characterized in that.

Hereinafter, an inorganic surface penetrant composition of the concrete of the present invention and a porous structure using the same will be described in detail.

1. partially hydrolyzed ethyl silicate

The hydrophilic material of the present invention is the use of ethylsilicate, more specifically from 50 to 90 weight of partially hydrolyzed and controlled ethyl silicate monomer. At this time, if it is 50 parts by weight or less, the amount of solid silicon dioxide required to fill the voids of the micropores is insufficient, and if it is 90 parts by weight or more, the surface penetrating agent is a porous body due to the excessive generation of solid silicon dioxide filling the micropores on the surface. It is undesirable because it impedes further penetration into it.

In more detail, ethyl silicate [Si (0C ₂ H ₅ ) ₄ ] is completely hydrolyzed by water to produce silica (SiO ₂ ), which is the main component of concrete, but in the actual reaction, it is partially hydrolyzed to form a hydrophilic group. It contains at least one [(0C ₂ H ₅ ) _4-n Si- (OH) _n ], wherein n is preferably 1 to 2. In addition, when two or more partially hydrolyzed ethyl silicates are present, the molecular weight increases due to self-condensation. In addition, the catalyzed reaction due to a base such as sodium oxide, potassium oxide, calcium hydroxide and the like coexist in the concrete is hydrolyzed and condensation reaction, the molecular weight increases and does not penetrate into the small space of the micropores of the concrete. In particular, calcium hydroxide reacts with partially hydrolyzed ethyl silicate to form calcium organic silicate salts, wherein the calcium silicate salt formed flows into the concrete paste structure to block micropores, and the surface penetrant penetrates deep into the micropores of concrete. Don't let that happen.

On the other hand, not only the calcium organic silicate salts, but also the products of ethyl silicate hydrolysis products and the products of continuous condensation reactions inhibit the ingress of surface penetrants due to the increase in size and at the same time allow the passage of water because they are hydrophilic. This inflow of water can cause corrosion of concrete and porous concrete structures using the same.

2. Selection of Hydrophobic Organic Silicon Compound

Therefore, 5 to 50 parts by weight of any one organic silicone compound selected from the group consisting of hydrophobic silane, oligomeric siloxane and low molecular weight polysiloxane of the present invention is introduced.

The organosilicon compound inhibits the formation of calcium silicate salts with partially hydrolyzed ethyl silicate and chemically reacts with the ethyl silicate on the concrete surface to provide hydrophobicity. Thus, the hydrophobicity formed on the surface inhibits the penetration of moisture into the concrete, while allowing the surface penetrant to penetrate deeply into the microcracks between the capillary pores and the interface.

Of the organic silicone compounds, the hydrophobic silane is represented by the following formula (1 ).

[(R ¹ ) _n Si (OR ² ) _4-n ]

(Wherein, R ¹ is an alkyl group of a linear or branched C ₁ ~C _8, R ² is an alkyl group of C ₁ ~C _3, is 1≤n≤3.)

R ¹ is any one selected from the group consisting of methyl, ethyl, propyl, isopropyl, butyl, isobutyl and iso-octyl, and R ² is methyl, ethyl or propyl, more preferably methyl or ethyl.

More specifically, the silane is preferably selected from the group consisting of isooctyl trimethoxy silane, isooctyl triethoxy silane, isobutyl trimethoxy silane, and isobutyl triethoxy silane.

In addition, as another example of the organic silicone compound of the present invention, an oligomeric siloxane ( Formula 2 ) and a low molecular weight polysiloxane ( Formula 3 ) may be used.

(Wherein, R ¹ is an alkyl group of a linear or branched C ₁ ~C _8, R ² is an alkyl group of C ₁ ~C _3.)

R ¹ is any one selected from the group consisting of methyl, ethyl, propyl, isopropyl, butyl, isobutyl and iso-octyl, and R ² is methyl, ethyl or propyl, more preferably methyl or ethyl. More specifically, the oligomeric siloxane is preferably selected from the group consisting of oligomeric isooctyl trimethoxy siloxane, oligomeric isooctyl triethoxy siloxane, oligomeric isobutyl trimethoxy siloxane, and oligomeric isobutyl triethoxy siloxane.

(Wherein, R ¹ is an alkyl group on the C ₁ ~C ₈ straight or grinding of, R ² is an alkyl group of C ₁ ~C _3, n> 4, and more preferably 4 <n <1,000.)

R ¹ is any one selected from the group consisting of methyl, ethyl, propyl, isopropyl, butyl, isobutyl and iso-octyl, and R ² is methyl, ethyl or propyl, more preferably methyl or ethyl.

Among the organic silicone compounds, the reaction of silane with partially hydrolyzed ethyl silicate is shown in Scheme 1 . First, silane (1) is reacted with water (2) to prepare a silane compound in which residues are hydrolyzed to Si-OH except hydrophobic R ¹ (3), and partially hydrolyzed with the hydrolyzed silane compound The ethyl silicate (4) reacted, and the compound (5) given hydrophobicity can be obtained.

(In the above, R ¹ and R ² are as defined above.)

In addition, as shown in Scheme 2 , the hydrolyzed silane compound (3) can be reacted with the polysilicate (6), which is a hydrated concrete product, to obtain a compound (7) imparted with hydrophobicity to the concrete surface. Thus, the silane imparts hydrophobicity to the surface penetrating agent so as to stay on the surface for a long time to suppress moisture penetration from the outside, and at the same time allow the surface penetrating agent to penetrate deep into the concrete paste.

(In the above, R ¹ is as defined above.)

3. Selection of solvent

In addition, the inorganic surface penetrant of the concrete of the present invention and the porous concrete structure using the same may be used alone with the tetraethylsilicate monomer. For example, if the porosity is high, it is desirable to use it without solvent so that as much of the solid material as possible can penetrate.

However, by diluting the tetraethylsilicate monomer in an appropriate solvent to provide fluidity, it can effectively penetrate into the voids in the concrete and the voids in the concrete paste structure.

In this case, the solvent is any one selected from the group consisting of glycol ethers, hydrocarbons, glycol ether esters, and C _{1 to} C ₄ alcohols, and the preferred amount is 10 to 50 parts by weight. At this time, when the solvent is less than 10 parts by weight, the higher the viscosity and solids content, the more difficult it is to penetrate into the dense concrete, and when it is 50 parts by weight or more, the amount of solid material formed in the micropores of the hydrated concrete paste is not sufficient. There is.

Solvent may be used for any organic solvent as possible is dissolved, is not particularly limited, preferably the acetates, the chlorine-substituted solvents such as aliphatic naphtha, with methylene chloride containing an alcohol, heptane, and hexane in the C ₁ ~C _4, Ester Preferably aromatic solvents, glycol ether esters and other linseed oils, including dibutyl acetate, including glycol ethers, ketones, xylenes and the like can be used.

More preferably, examples thereof include glycol ethers selected from the group consisting of DPM, TPM, DPMA, PnP, DpnP, TPnP, PnB, DPnB, TPnB, PPh and DMM; Hydrocarbons including toluene, xylene, and mineral spirits; Glycol ether esters; A C ₁ ~C ₁₂ straight-chain or branched alcohols on. More preferably, glycol ethers or alcohols are used, particularly, most preferably, when dipropylene glycol methyl ether (DPM), tripropylene glycol methyl ether (TPM) or isopropyl alcohol is used. Do.

4. Selection of Surfactants

The surfactant has a property of reducing surface tension, so that when the surface penetrant of the present invention is applied to a concrete structure, it is more widely distributed and has a depth into capillary pores of the concrete paste, fine cracks formed between the concrete paste and their aggregates, and a porous interface. Can penetrate However, in the case of a porous structure, it is not necessary to use surfactant.

The surfactant that can be used may be used without particular limitation to hydrocarbon-based surfactants, silicone-based surfactants, and fluorine-based surfactants, more preferably fluorine-based surfactants.

The fluorine-based surfactant has a water-soluble functional group substituted at the end of a hydrophobic linear molecule containing a fluorine atom, and has excellent repulsion ability against water and oil, and particularly, has a surface active effect on an organic solvent, and contains trimethylammonium salt. Perfluoro oligomers of amphoteric surfactants are representative.

The preferred amount of the surfactant of the present invention is 0.05 to 0.5 parts by weight based on the oligomeric silicate, more preferably 0.02 to 0.2% by weight when using a fluorine-based surfactant. At this time, when the amount is less than 0.05% by weight, their effect is low. When the amount is more than 0.5% by weight, the amount of the surfactant required is more than necessary, so that deep penetration is difficult.

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

This embodiment is intended to describe in detail using the most preferred embodiment of the present invention to the extent that those skilled in the art can easily carry out the technical idea of the present invention, The range is not limited to these examples.

<Example 1>

40.00% by weight of ethyl silicate monomer (silbond, Series No. 001), 40.00% by weight of isobutyl trimethoxy silane and 18.80% by weight of solvent dipropylene glycol methyl ether (DPM) were stirred and mixed, and a fluorine-based surfactant 0.2 By adding weight%, an inorganic surface penetrant composition of the concrete and the porous concrete structure using the same was prepared.

<Examples 2 to 6>

Except for using isobutyl trimethoxy silane as shown in Table 1 and using an organic silicone compound and 0.1% by weight of fluorine-based surfactant, the same as in Example 1, concrete and using Inorganic surface penetrant compositions 2 to 6 of the porous concrete structure were prepared.

<Example 7>

Except not using a surfactant, it was carried out in the same manner as in Example 1, to prepare an inorganic surface penetrant composition of concrete and porous concrete structure using the same.

Comparative Example 1

Except not using an organic-based silicon, it was carried out in the same manner as in Example 1, to prepare an inorganic surface penetrant composition of concrete and porous concrete structure using the same.

Experimental Example 1

The performance of the inorganic surface penetrant of the concrete prepared in the above embodiment and the porous concrete structure using the same was tested as follows.

1. Water absorption rate (%)

In order to test the waterproof performance of the inorganic surface penetrant prepared in the above Example, the surface penetrants of Examples 1 to 7 and Comparative Example 7 were sufficiently dried, and then dipped in corrosive potassium solution for 6 hours for 5 days. It was left to stand and epoxy coated on one surface penetrant. After 48 hours after immersion in water was measured water absorption (%). Water absorption was calculated by the following Equation 1, the results are shown in Table 1 and FIG .

(A: water absorption rate (%), W ₁ : weight of surface penetrant before absorption, and W ₂ : weight of surface penetrant before absorption (g).)

From Table 1, the organic silicone compound provides hydrophobicity, and the longer the alkyl group, the lower the water absorption rate of the inorganic surface penetrant, and thus, isobutyl trimethoxysilane and oligomer methyl methoxy-siloxane were 50 compared to Comparative Example 1. It showed waterproof performance of more than%, most preferably in the case of isooctyltrimethoxy silane or oligomeric iso-octyl methoxy-siloxane.

FIG. 1 compares the amount of water absorbed with respect to the case where the inorganic surface penetrant of Example 2, which showed the best effect above, on the concrete surface and when not treated. At this time, after 72 hours, 65 g of water was absorbed when not treated with the surface penetrant, whereas about 10 g of water was absorbed when surface treated with the inorganic surface penetrant of Example 2.

2. Freeze / thaw resistance measurement

In order to measure the degree of freeze / thaw resistance to the inorganic surface penetrants prepared in Example 2 and Comparative Example 1, the solution was maintained at -12 ° C to 20 ° C for 12 hours in a 3% sodium chloride solution. after that, shown in Figure 2 to observe weight change.

As a result of FIG. 2, the inorganic surface penetrant of the present invention was always kept constant in the number of freezing / thawing cycles, while the comparative example showed a sharp change in weight loss over 20 cycles.

Therefore, the inorganic surface penetrant of the present invention is advantageous in strengthening the durability of the concrete because it is less affected by the volume expansion caused by water or water in the air.

3. Measurement of resistance to salinity

After applying the inorganic surface penetrant prepared in Example 2 to the concrete surface with a brush, the degree of salt penetration was measured ( FIG. 3 ).

The concrete surface treated with the surface penetrant was immersed in 15% aqueous sodium chloride solution for 50 days. The surface was then thoroughly cleaned and the chlorine content was measured in a 2 cm thick concrete layer, but measured 1 cm from the center below the surface. At this time, since the concrete cover is usually deeper than 1 cm, surface contamination to a depth of 1 cm was not considered.

As a result of FIG. 3, when the inorganic surface penetrant of the present invention was not treated on the surface, 27,000 ppm of salt was penetrated, whereas the inorganic surface penetrant of the present invention showed a significantly low penetration of 430 ppm. .

Experimental Example 2

Inorganic surface penetration agents and conventionally used surface penetration agents of the present invention were classified into the following experimental groups and tested for penetration depth, penetration rate, water absorption, viscosity, surface tension, porosity, and gas penetration rate. Each result is described in Table 2 .

A: surface penetrant containing potassium silicate,

B: surface penetrant containing sodium silicate,

C: surface penetrant containing silane-siloxane composition,

D: surface penetrant containing the composition of the present invention,

E: surface penetrant consisting of sodium silicate, sodium alginate and polymer solution,

F: Surface penetrant consisting of sodium silicate and polymer dispersion (polymer latex).

           Kinds A B C D E F No treatment Penetration depth, mm 26.3 17.0 7.5 13.4 2.46 25.4 - Penetration coefficient, mm / sec.bar 0.107 0.084 0.019 0.050 0.044 0.043 0.164 Water absorption rate (%) 12.27 13.33 12.28 0.89 12.17 9.9 12.54 Gas (air) penetration rate ^a , K _t (m ² ) 0.203 × 10 ^-16 0.239 × 10 ^-16 0.186 × 10 ^-16 0.160 × 10 ^-16 0.215 × 10 ^-16 0.215 × 10 ^-16 0.210 × 10 ^-16 Viscosity, cP (T ° C) 27.1 (23.5) 28.3 (23.7) 26.4 (23.0) 25.5 (23.9) 32.2 (23.9) 22.00 (22.3) 17.5 (24) Surface tension, dynes / cm 61 38 28 26 35 36 75

a: The measurement time is 720 seconds.

Among the above compositions, the surface penetrant of C containing silane-siloxane contains a part of the composition of the present invention and has the composition most similar to the present invention. Thus, comparing the results of the two surface penetrants, the surface tension was relatively lower than the other surface penetrants. However, in the experiment of water absorption rate, the surface penetrant of C shows 12.28%, whereas the surface penetrant of the present invention (D) shows a dramatic difference of 0.89%. Therefore, from the above results, it is proved that the composition of the present invention consisting of any one of the organic silica compound selected from the group consisting of ethyl silicate monomer, hydrophobic silane, oligomeric siloxane, and low molecular weight polysiloxane as surface penetrating agent. In addition, as a result of measuring the gas (air) permeability, other types of surface penetrants were almost unchanged from 0.210 × 10 ^-16 when the surface penetrant was not treated, while 0.160 × 10 ^-16 when the surface treatment agent of the present invention was treated. By appearing, the gas (air) movement was smooth.

As a result of the above, the concrete and the surface penetrating agent for protecting the concrete structure using the same are selected from the group consisting of 1) partially hydrolyzed ethyl silicate monomer and 2) hydrophobic silane, oligomeric siloxane and low molecular weight polysiloxane. By inducing a chemical bond with one organic silicone compound, it gives hydrophobicity to the concrete surface for a long time and at the same time a group consisting of glycol ethers, hydrocarbons, glycol ether esters, and alcohols of C _{1 to} C ₄ By further comprising one organic solvent or surfactant selected from, it is possible to penetrate deeper into the concrete by lowering the surface tension of the liquid surface penetrant. Therefore, the concrete and the surface penetrating agent for protecting concrete structures using the same have significantly low water absorption (%) and low salinity penetration, thereby fundamentally blocking the cause of concrete corrosion and providing breathability to confirm the smooth breathing of concrete. It was.

As described above, the concrete and the surface penetration agent for protecting concrete structures using the same

First, unlike conventional surface penetrants for concrete that simply form a film on the concrete surface, by inducing chemical bonding to the concrete surface to give hydrophobicity, by realizing the deep penetration of the surface penetrant, has a long time protective effect,

Second, the conventional surface treatment agent consisting of silane / siloxane only has to be replaced every 4 to 5, while the surface treatment agent of the present invention penetrates the silicon dioxide generated by the chemical bonding of the concrete surface and silane (siloxane, etc.). Have a permanent life,

Third, due to the lower surface tension than water, the penetration is excellent, which effectively suppresses the absorption of water or salt than conventional surface penetrants,

Fourth, the concrete breathing smoothly,

Fifth, it is easy to apply by applying on concrete, and it is suitable for the use other than including concrete block, concrete brick and concrete, especially hydroponic concrete use, and can be used also for building ceramics such as porous ceramic or natural stone. .

1 is a result of measuring the amount of water absorbed for the inorganic surface penetrant of the present invention,

2 is a result of measuring the freezing / thawing resistance of the inorganic surface penetration agent of the present invention,

3 is a result of measuring the salt permeability of the inorganic surface penetration agent of the present invention.

Claims (7)

1) 50 to 90 parts by weight of partially hydrolyzed ethyl silicate monomer; And 2) 5 to 50 parts by weight of any one organic silicone compound selected from the group consisting of hydrophobic silane, oligomeric siloxane, and low molecular weight polysiloxane; And 3) 10 to 50 parts by weight of any one organic solvent selected from the group consisting of glycol ethers, hydrocarbons, glycol ether esters, and C _{1 to} C ₄ alcohols, and porous materials using the same. Inorganic surface penetrants in concrete structures. The inorganic surface penetrant of claim 1, wherein the surface penetrant further comprises 0.05 to 0.5 parts by weight of the surfactant. According to claim 1, The silane is characterized in that represented by the formula 1, the inorganic surface penetration agent of the concrete and porous concrete structure using the same. Formula 1 [(R ¹ ) _n Si (OR ² ) _4-n ] (Wherein, R ¹ is an alkyl group of a linear or branched C ₁ ~C _8, R ² is an alkyl group of C ₁ ~C _3, is 1≤n≤3) The method of claim 3, wherein the silane is any one selected from the group consisting of isooctyl trimethoxy silane, isooctyl triethoxy silane, isobutyl trimethoxy silane and isobutyl triethoxy silane. Inorganic surface penetration agent of concrete and porous concrete structure using same. According to claim 1, wherein the oligomer siloxane is characterized in that represented by the formula (2), the inorganic surface penetration agent of the concrete and porous concrete structure using the same. Formula 2 (Wherein, R ¹ is an alkyl group of a linear or branched C ₁ ~C _8, R ² is an alkyl group of C ₁ ~C _3.) 6. The oligomeric siloxane of claim 5, wherein the oligomeric siloxane is any one selected from the group consisting of oligomeric isooctyl trimethoxy siloxane, oligomeric isooctyl triethoxy siloxane, oligomeric isobutyl trimethoxy siloxane, and oligomeric isobutyl triethoxy siloxane. Characterized in that the inorganic surface penetrant of the concrete and porous concrete structure using the same. According to claim 1, The low molecular weight polysiloxane is characterized in that represented by the formula (3), the inorganic surface penetration agent of the concrete and porous concrete structure using the same. Formula 3 (Wherein, R ¹ is an alkyl group on the C ₁ ~C ₈ straight or grinding of, R ² is an alkyl group of C ₁ ~C _3, n> 4, and more preferably 4 <n <1,000.)