KR20060102610A - Inorganic paint composites using ph-control in normal temperature its manufacturing method and usage thereof - Google Patents

Abstract

The present invention relates to a room temperature dried inorganic coating composition using pH control, a method for producing the same, and a use thereof, and an object thereof is an inorganic coating composition obtained by hydrolyzing alkoxysilane, at least one selected from an alkali solution or a buffer solution. By adding and maintaining the pH of the paint to increase the pot life, shorten the curing time, and drying at room temperature, at room temperature drying inorganic coating composition that can be applied to anyone without special restrictions and its manufacturing method and uses To provide.

The present invention is 1 to 40% by weight of the organo alkoxysilane represented by the general formula R _n Si (OR ') _4-n ; 0.5 to 20% by weight of a colloidal oxide containing water or an organic solvent as a dispersion medium in terms of solid content; 0.1-70% by weight of lower aliphatic alcohol; 0.1-3 wt.% Organic / inorganic acid; 0.01-20 wt% of inorganic filler; 0.01-40 weight% of inorganic pigments; Alkaline solution, buffer solution consists of 0.1 to 5% by weight of a single or mixed pH stabilizer. Wherein R is an alkyl group having 1 to 6 carbon atoms, R 'is an alkyl group having 1 to 5 carbon atoms or an acyl group having 1 to 4 carbon atoms.

Inorganic paint, room temperature drying, pH control, buffer solution, alkaline solution

Description

Inorganic paint composites using pH-control in normal temperature its manufacturing method and usage

1 is a block diagram showing a manufacturing process of the present invention

The present invention relates to a room temperature dry inorganic coating composition using pH control, and a method and a use thereof. The present invention relates to an inorganic coating composition for coating a surface of metal, nonmetal, glass, plastic, cement, slate, and the like to form an excellent interior and exterior coating material for construction, and its It relates to a manufacturing method and use.

Generally, inorganic paint is coated and cured on the surface of metal, such as stainless steel and aluminum, and cement, glass, plastic, paper, etc., so that beautiful beauty, heat resistance, weather resistance, contamination resistance, high hardness, water resistance, adhesion, corrosion resistance, and durability , Functional paints that impart cold and heat resistance have been widely applied to various fields and are already introduced in Japanese Patent Laid-Open Publication Nos. 51-2736, 53-130732, 64-168, and Korean Patent 2000-0010246.

However, in the case of the introduced inorganic coating composition, heat treatment (at least 50 ℃ or more) was necessary in order to obtain complete properties as an inorganic coating film, and additional professional facilities for baking (heat treatment) work and equipment constraints and increase in manufacturing cost were raised. Is required.

Metal alkoxide-based inorganic coating compositions for converting and hydrolyzing colloidal pH by administering organic and inorganic acids are also disclosed in Korean Patent Application Publication No. 1990-0009898. However, since this method is limited to the administration of organic and inorganic acids, the mixture of the subject and the curing agent is mixed. Due to the acidity of the liquid paint, the pot life is short due to the polycondensation reaction, and the gel is easily gelled and deteriorated within a few days due to the pH effect of the alkaline pigment or filler. In addition, since it is a method of hydrolyzing with the main body by adding an organic or inorganic acid to the curing agent, it requires a separate aging time and stirring, which is not suitable for aging and use by the general public.

Japanese Unexamined Patent Publication No. 1998-268772 also proposes a coating agent that is cured near room temperature, mainly composed of silicone alkoxides, but uses only a curing catalyst, resulting in poor paint storage properties and easy cracking of the coating film. In addition, there is a disadvantage that the curing time is largely influenced by a slight humidity change.

Korean Patent 1999-0007963 also proposed a coating composition capable of room temperature curing and heat curing using acrylic resin which is a copolymer of an alkoxysilane hydrolyzed oligomer solution and acrylate ester and methacrylate ester. The pot life is short due to the pH change, and a large amount of organic material is contained, so that hardness, weather resistance and heat resistance are poor.

In the inorganic coating composition as described above, most of the alkoxysilane hydrolyzed paints have a pH in the acidic to weakly acidic region, which has a problem in that construction is difficult because the condensation polymerization reaction occurs continuously and the pot life of the paint is not long.

The present invention is to solve the above problems, the purpose is to maintain and control the pH of the paint by adding at least one selected from the inorganic paint composition of the hydrolyzate alkoxysilane or the buffer solution (buffer solution) By increasing the pot life, shortening the curing time, and drying at room temperature, and at the same time to provide a room temperature drying inorganic coating composition and its manufacturing method and use that can be coated by anyone without special restrictions.

The present invention is an organo represented by the general formula R _n Si (OR ') _4-n (wherein R represents an alkyl group having 1 to 6 carbon atoms, R' represents an alkyl group having 1 to 5 carbon atoms or an acyl group having 1 to 4 carbon atoms). 1-40% by weight of alkoxysilanes; 0.5 to 20% by weight of a colloidal oxide containing water or an organic solvent as a dispersion medium in terms of solid content; 0.1 to 70% by weight of one or more lower aliphatic alcohols selected from the group consisting of methanol, ethanol, propanol, isopropylol, n-butanol and isobutanol; 0.1 to 3% by weight of one or more organic / inorganic acids selected from the group consisting of phosphoric acid, hydrochloric acid, sulfuric acid, nitric acid, acetic acid and formic acid; 0.01-20% by weight of one or more inorganic fillers selected from whiskers of potassium titanate, aluminum borate whisker, alumina, silicon nitride, silicon carbide, silica-alumina, glass fiber, carbon fiber fine powder, porous inorganic antimicrobial fine powder and inorganic rust inhibitor ; 0.01 to 40% by weight of at least one inorganic pigment selected from rutile titanium oxide pigment and mica-titanium oxide non-toxic pearl pigment; It is composed of 0.1 to 3% by weight of a pH stabilizer for converting and fixing the pH into a neutral region.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing a manufacturing process of the present invention. In the present invention, the alkoxysilane is reacted by adding a colloidal oxide, an organic and inorganic acid, and the reaction solution. After adding alcohol, filler and pigment to the particle, the average particle size was 10㎛ or less, and stirred with a mill such as a ball mill and a sand mill.Then, after washing with alcohol, an alkali solution and a buffer solution were added to the paint. After the pH is stabilized, it is used by stirring to prevent a precipitate.

The present invention, which is constituted as described above, is based on a one-component type, and, if necessary, an alkaline solution having a pH of 7.5 to 10 as a hydrolysis of a metal alkoxysilane as a two-component mixed inorganic paint divided into a pigment part and a resin part and a pH stabilizer or The pH can be stabilized by adding 0.1 to 5% by weight of a buffer solution consisting of conjugate acid and its base salt, in a range of pH = 6.5 to 7.3, alone or in combination. That is, the filler and the pigment are divided into a pigment portion stirred using a ball mill and a sand mill as an alcohol solvent, and an organic and inorganic acid is added to the alkoxysilane and colloidal oxide, followed by a resin portion into which an alkaline solution and a buffer solution are added. It can also be used as a two-liquid mixture type, such a two-liquid mixed inorganic paints will further extend the storage period.

The alkoxysilane is represented by general formula R _n Si (OR ') _4-n (wherein R represents an alkyl group having 1 to 8 carbon atoms, R' represents an alkyl group having 1 to 5 carbon atoms or an acyl group having 1 to 4 carbon atoms). Representative examples of alkoxysilanes are methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, n-propyltriethoxysilane, i-propyltrimethoxysilane, n-propyltriethoxy Silane, phenyl trimethoxysilane, phenyl triethoxysilane, etc. are mentioned, The said alkoxysilane is used in combination of 1 or more types.

The colloidal oxide is added to hydrolyze the alkoxysilane. The colloidal oxide has water or / and an organic solvent as a dispersion medium, imparts wear resistance, and is classified into an acidic colloid and a basic colloid.

Since the alkoxysilanes are hydrolyzed without the addition of an organic or inorganic acid, the acidic colloid may stabilize the pH of the composition and adjust the curing rate by using an alkaline solution or a buffer solution on one paper after hydrolysis. Japan, such as ST-O, O-33, Al ₂ O ₃ zol-100, Al ₂ O ₃ zol-200, NAYCOL 2034DI, LUDOX SK, TMA, CL, Japan, etc. SN.

If such acid colloids are used the composition is acidic. The acidic, weakly acidic alkoxysilane hydrolyzable coating composition has a disadvantage in that the pot life of the paint is short due to the continuous polycondensation reaction. In addition, since the pH is easily changed by pigments, inorganic fillers, and the like, the hydrolyzed composition has a shorter pot life. When the pot life of the paint passes, the coating film hardly hardens, and various problems such as deterioration of paintability, glossiness deterioration, and property deterioration appear. This problem can be overcome by adjusting the pH by adding at least one selected from alkaline solutions or buffer solutions.

The basic colloid should be hydrolyzed by addition of organic and inorganic acids unlike acid colloids. The organic and inorganic acids to be added include acetic acid, formic acid, carbonic acid, phosphoric acid, oxalic acid, sulfuric acid, nitric acid, hydrochloric acid, paratoluenesulfonic acid, and the like. If the amount is added to 0.01 ~ 3% by weight less than 0.01% hydrolysis reaction does not occur well, when added more than 3% may cause a rapid reaction and lower pot life and may be irritating to the unique smell of organic acids. Such basic colloids include, for example, Nippon Chemical Corporation ST-20, ST-30, ST-40 LUDOX HS-30, HS-40 Nippon Chemical Co., Ltd. SI-45P, SI-80 and the like.

The organic colloid is added to the basic colloid to make acidic colloid, and then hydrolyzed with alkoxysilane, and an alkaline solution and a buffer solution are added thereto. Stabilization with alkaline solution and buffer solution and drying at room temperature are the same as for acid colloid.

The buffer solution is added for the purpose of stabilizing the entire composition and curing at room temperature. The mixed solution of the weak acid and its salt or the mixed solution of the weak base and the salt is diluted even by adding a small amount of acid or alkali or by adding water. pH has a property that hardly changes. These buffers are neutral or near neutral and significantly increase the pot life of the paint by preventing the paint from further condensation polymerization. In addition, when the composition is applied, the organic acid is rapidly volatilized in the coating film in the buffer solution to make the coating alkali to allow room temperature drying.

The buffer solution has a pH = 6.5 ~ 7.3, preferably has a pH = 6.8 ~ 7. If the pH = 6.5, there is a disadvantage in that the polycondensation reaction of the paint continues to decrease the pot life of the paint, and if the pH = 7.3 or more, the reaction occurs in the form of particles and easily gel (GEL).

There are two main reasons for the use of the buffer solution, the first of which is to stabilize the pH as described above to prevent the deterioration of the paint due to the change in the paint pH by the pigments, fillers, colloidal oxide having an alkali in the paint To prevent it. The second reason is that when the composition is coated, the conjugate acid in the buffer is easily volatilized. When the acid is rapidly volatilized, the pH stabilization function is lost as a buffer solution, leaving only basic salts or base salts, and the base is alkalinized. Alkalineized coating film is easily gelled (GEL) and the coating film is hardened, so it is suitable for room temperature dry paint. After coating at room temperature (10 ~ 30 ℃) without a separate baking device, it becomes a touch-curable state that can be touched by the rear hand for about 30 minutes, and a complete cured coating film can be obtained after about 5 days.

The acid used in the buffer solution may include acetic acid, formic acid, carbonic acid, phosphoric acid, oxalic acid, sulfuric acid, nitric acid, hydrochloric acid, paratoluenesulfonic acid, and the like. Preferably, a weak acid (pH = 3 to 6.5) is used. In the case of strong acid (pH = 1 to 3), it is difficult for the present invention to obtain the desired buffer solution pH = 6.5 to 7.2, and it is easy to leave the buffer region, thereby deteriorating the stability of the paint. In addition, most of the strong acid (hydrochloric acid, sulfuric acid, nitric acid) is harmful to the human body even if a small amount of irritation should be avoided. A good thing is to use acetic acid or formic acid, which is not irritating to the human body and can be easily volatilized.

Alkali metal salt OR Alkaline metal salt which is added with acid when preparing buffer solution includes calcium acetate, potassium acetate, lithium acetate, sodium acetate, magnesium acetate, calcium formate, potassium formate, lithium formate, sodium formate, magnesium formate, Potassium phosphate, calcium phosphate, lithium phosphate, sodium phosphate, magnesium phosphate, calcium nitrate, sodium nitrate, lithium nitrate, potassium nitrate, magnesium nitrate, magnesium sulfate, calcium sulfate, sodium sulfate, lithium sulfate, potassium sulfate, sodium carbonate, calcium carbonate, carbonate Potassium, magnesium carbonate, lithium carbonate and the like. Among them, metal acetate and formic acid salts are good in volatilization and easy to prepare buffer solution neutral. Sulfates and nitrates are not good because they are harmful to sulfuric acid and nitric acid.

Acetic acid (CH ₃ COOH) with less alkyl group and its salt (potassium acetate (CH ₃ COOK)) can be mixed and dissolved in ionized water or formic acid (HCOOH) with sodium formate (HCOONa) or potassium formate (HCOOK) It is best to mix the salts and dissolve in ionic water, and the buffer solution is added within the range of 0.1 to 5% by weight, preferably 0.1 to 3% by weight of the total coating composition. If it is less than 0.1% by weight, the pH of the paint cannot be stabilized or fixed, and the overall pH of the paint is easily changed due to the alkalinity of the pigments or fillers. .

The actual buffer solution is innumerable, but this kind of buffer is described by way of example as follows.

Example 1

pKa = the degree of H ₂ CO ₃ 6.1 (carbonate), assuming you want to create a buffer of pH = 6.8 carbonate pKa = by 6.1 H ₂ CO ₃ and HCO ₃ ^- is present in two forms: H ₂ CO ₃ Is conjugate acid, HCO ₃ ^- is base.

Acids in this relationship are called base pairs. The buffer pH is equal to pKa when the same acid (the species that can give the proton to the base (ion or heavy component)) and the base (the species that can accept the proton (heavy component or ion)) are mixed Equal to the value. In other words, if H ₂ CO ₃ and HCO ₃ ⁻ are equal, the pH will be 6.1, such as pKa, and of course, the base must be more than the counter acid to produce a buffer at pH = 6.8. How much more can be obtained with the Henderson-Hasellbach equation.

pH = pKa + log (base / base)

pKa = 6.1, desired pH = 6.8, so 6.8 = 6.1 + log (base / base)

log (base / base) = 0.7 approx. (base / base) = 5.

Therefore, carbon is the conjugate base (HCO ₃ ^-): conjugate acid _{(H 2 CO 3) = 5} : is mixed at a ratio of 1: 1 can make a carbonate buffer solution of the desired pH = 6.8.

Example 2

Another buffer solution may be organic acid + alkali metal OR alkaline earth metal. A pH = 6.8 buffer is prepared using acetic acid and its salts. Assuming that 100 ml of 0.1 M acetic acid solution and 100 ml of 0.1 M sodium acetate solution are prepared, use one as a reference solution and slowly pour the remaining solution. Can be set to 6.8.

Solutions containing these two substances can neutralize acids or bases of pigments or fillers which are slowly released in the paint.

If acid is added to this buffer solution is added coating, the addition of the H ⁺ CH ₃ COO ^- and CH ₃ COOH to the reaction so that the pH of the solution is hardly changed.

If ten thousand and one base is added to the buffer solution, it was added a OH _- are H ₃ O ⁺ and a neutralization reaction by H ₃ O ⁺ is reduced because the equilibrium is shifted to the right by the pH of the solution is hardly changed.

The alkali solution is added to increase the pot life by adjusting the pH of the paint to neutral, when the composition is prepared using an acid colloid, it is difficult to adjust to neutral (pH = 6.5 ~ 7.2) with only a small amount of buffer solution In this case, a small amount (0.01 to 5% by weight, preferably 0.01 to 2% by weight) of alkaline solution (pH = 7.5 to 10) is added to neutralize, thereby increasing pot life. Representative alkali solutions include ammonia water, sodium carbonate solution, calcium carbonate solution, magnesium hydroxide solution, sodium hydroxide solution, potassium hydroxide solution, barium hydroxide solution, lithium hydroxide solution and the like. In this case, the strong alkaline solution is not only harmful to the human body, but also because the pH is easily changed due to the addition of a very small amount, it is not easy to match the neutral region of the paint, it is preferable to use a weak alkaline solution of ammonia water or sodium carbonate solution.

Both the alkaline solution and the buffer solution can stabilize the pH of the composition, but the effect of the buffer solution is greater. This is because the pH of the paint is likely to change due to the influence of pigments and fillers in the composition, the buffer solution can maintain the pH almost without being affected by such pigments or fillers.

The alcohol is used as a dispersion solvent and includes methanol, ethanol, propanol, isopropylol, n-butanol, isobutanol, and the like, or one or two or more thereof.

The inorganic filler improves the hardness of the coating film, and is added for reasons such as preventing cracking of the coating film and sedimentation of the paint, whiskers such as potassium titanate, aluminum borate whisker, alumina, silicon nitride, silicon carbide, silica-alumina, glass fiber, carbon, etc. Fine powders such as fibers, porous inorganic antibacterial fine powders (Korean Patent No. 145990), inorganic rust preventives and the like are used in combination of one or two or more.

The inorganic pigments include inorganic pigments such as rutile titanium oxide having an average particle diameter of 0.03 to 20 μm, non-toxic pearl pigments such as mica-titanium oxide, aluminum paste, stainless paste, etc. Use 1 type, or 2 or more types.

The composition of the present invention as described above is coated on the coating materials such as metals, nonmetals, cement, cement secondary products, glass, plastic, paper as a kind of coating materials, heat resistance, weather resistance, water resistance, corrosion resistance, high hardness, durability, stain resistance, plastering Applied to all materials that require effects, representative examples of the metal include aluminum and aluminum alloys, stainless steel alloys, zinc molten / plated steel sheets, aluminum molten / plated steel sheets, titanium steel sheets, and the like.

Hereinafter, the present invention will be described in detail by way of examples.

Example 3

After colloidal silica, colloidal alumina and organic acid are added to the alkoxysilane, it is hydrolyzed, and then half of the total alcohol (methanol, isopropyl alcohol, ethanol) is added, and the filler (inorganic antibacterial material, inorganic rust preventive material, and other fillers) is added. ), Add the pigment and stir with a ball mill, sand mill, etc. so that the average particle size is 10㎛ or less, wash it with the remaining 1/2 of alcohol, add a buffer solution, Stir well to avoid. When the average particle size is 10 μm or more, the plastering and fouling resistance tend to be deteriorated, and when the composition is coated, it is used to stir or stir so that there is no precipitate.

Example 4

After colloidal silica, colloidal alumina and acid were added to the alkoxysilane, it was hydrolyzed, and then 1/3 of the total alcohol was added. Then, a buffer solution was added to form a resin part.

Filling material (inorganic antibacterial material, inorganic rustproofing material, other filling material) and pigment in 1/3 of the total alcohol content and stirred to a particle size of 10㎛ or less by using a ball mill (sand mill), It is washed with the remaining 1/3 of alcohol to produce a pigment part,

The resin part and the pigment part are mixed and mixed evenly during the coating work and then coated.

The composition ratio of the inorganic coating film composition formed by Examples 3 and 4 is shown in [Table 1], and the results of the pot life and the curing time according to the pH of the composition are shown in [Table 2].

Table 1

* a) Japan Al ₂ O ₃ zol-100

b) Formic Acid (HCOOH = 46.03)

* c) Large Inorganic Antimicrobial Powder of Patent No. 145990

d) GERMANY NYCO MINERALS, INC. Wollastonite

* e) Tismo-D and GERMANY Degussa Al ₂ O ₃ oxcide-C, Otsuka Chemical Co., Ltd., Japan

* f) Al ₂ O ₃ zol-200

g) Acetic Acid (CH ₃ COOH = 60.05)

* 1) Japan Nissan Chemical Corporation SNOWTEX -30

* 2) Japan Nissan Chemical Corporation SNOWTEX -40

* 3) USA DuPont Ludox collidal sillica HS-40

* 4) USA DuPont Ludox collidal sillica CL-X

* 5) Japan Chemical Co., Ltd. SN

* 6) OSCAL IPA-ST, Japan

* A) HCOOH + HCOOK + H ₂ O buffer

* B) CH ₃ COOH + CH3COOK + H ₂ O buffer

* C) NH ₄ OH 3% alkaline solution

* D) Na ₂ CO ₃ 3% alkaline solution

[Table 2]

As shown in [Table 2], it can be seen that the pot life and curing time of the paint greatly depend on the pH of the paint. Although it varies depending on the type, as shown in Table 2, the composition to which the alkaline solution and the buffer solution are added can be stored in a cold dark place for 2.5 months and up to 3 months, and when the storage period is longer than that, the resin part and When stored in pigments, the shelf life is over 6 months. On the other hand, the M, N, O, R composition does not add a buffer solution, but also short pot life and curing time can be confirmed that also slow. On the other hand, in the case of the composition added only alkaline solution, the pH of the paint is stabilized, but the drying time is slower at room temperature than in the case of the composition added buffer or alkaline solution + buffer solution.

In addition, the composition of [Table 1] was coated with a film as shown in [Table 3], and the physical properties were tested. The results are shown in [Table 4].

Table 3

Table 4

○: no abnormality in coating appearance, △: fine crack or slight corrosion,

X: crack, peeling corrosion (defect),-: untestable or meaningless.

* Test method and related standards

Pencil hardness: pencil hardness test (JIS K 5600 8.4.1 (5) (b)

-Glossiness test: 60 ° mirror glossiness (JIS H 4001 6.6, JIS K 5400 8.4)

-Adhesive force test: Peel off with 100/100 thickness tape at 1mm interval (KS D 6711 6.3, JIS K 4001 6.3)

-Flexibility: Peel off the coating surface tape after bending 7 / 16ψ 180 ° (JIS H 4001 6.4)

-Impact resistance: 500g steel ball 50cm drop on coating surface (KS D 6711 6.5, JIS H 4001 6.5)

-Heat resistance: 200 ℃ / 1 hour in electric furnace (JIS K 5400 8.13)

-Pollution resistance: [Carbon / water] application 80 ℃ / 24 hours

-Pollution resistance: Apply with [Carbon / Vaseline / BC] solution and wash with running water

Alkali resistance: Soaked in 5% sodium carbonate for 24 hours (JIS K 5600 8.21)

Acid resistance: 24 hours immersion in 5% sulfuric acid (JIS K 5600 8.22)

-CASS: Salt spray NacCl 5%, CuCl ₂ 0.26g / ℓ, Acetic acid 0.1ml Continuous spraying 48 hours (JIS H 8681)

Saline resistance: 240 hours soaked in 5% NaCl (JIS K 5600 8.23)

-Pin hole: 25 ℃ RH60 ± 5% pinhole solution drop / 1 hour

Weatherability: 1,000 hours of Sunshine Weather Meter (JIS K 5600 9.8)

-Flame retardant: Propane gas 350㏄ / min 10 minutes Smoke coefficient (CA) Heat 1.5㎾ (KS F 2271)

-Boiling water resistance: 4 hours of boiling water (distilled water) deposition (JIS 5600 8.20)

Water resistance: Immersion in tap water / 720 hours (JIS K 5600 8.19)

Solvent resistance: 240 hours of 12/15 deposition in benzene and toluene

As described above, the physical properties were excellent regardless of the pot life and the pH of the paint. In other words, the alkali solution or buffer solution added to stabilize the pH of the paint had little effect on the physical properties and only affected the pot life and the drying time of the paint.

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 a functional coating that provides a beautiful coating, heat resistance, weather resistance, pollution resistance, high hardness, water resistance, adhesion, corrosion resistance, durability, cold and heat resistance by coating on the surface of non-metal, metal, cement, slate, etc. It can form excellent interior and exterior coating film for building, and can be used immediately by anyone without special equipment.

According to the present invention, the final reactant is ceramicized to form an inorganic coating film. The inorganic coating film is not only physically and chemically stable but also does not emit environmental hormones or volatile organic substances (VOCs) that are harmful to the human body unlike organic paints. Equipped with. In addition, the present invention obtained the best grade in TVOC (mg / ㎡h): 0.007 HCHO (mg / ㎡h) in the "Green Building Materials Certification" of the Korea Air Cleaning Association on January 27, 2005, (Certification No .: HB165F05-01) Far-infrared emissivity: 0.916 Radiation energy (W / m ㅂ): 7.89 × 10 ^{2 It} emits large amount of far-infrared rays, which is beneficial to human body, and tested mold resistance of paint at KNPS M 5000, Test Method 3431) has been awarded the best grade of 10, and has excellent physical properties and characteristics such as being recognized as flame retardant grade 1 in the flame retardant test.

In addition, the present invention stabilizes the pH of the composition by adding a buffer solution, greatly improved the storage capacity, and can be dried at room temperature, so that there is no need for a thermosetting (baking) process to obtain a coating film of the existing inorganic composition. This has many effects, such as being able to produce high efficiency at low cost from the consumer's point of view.

Claims (10)

1 to 40% by weight of organo alkoxysilane represented by the general formula R _n Si (OR ′) _4-n ; 0.5 to 20% by weight of a colloidal oxide containing water or an organic solvent as a dispersion medium in terms of solid content; 0.1-70% by weight of lower aliphatic alcohol; 0.1 to 3 weight percent organic or inorganic acid; 0.01-20 wt% of inorganic filler; 0.01-40 weight% of inorganic pigments; Room temperature drying inorganic coating composition using a pH control, characterized in that it comprises 0.1 to 5% by weight of an alkaline solution, a pH stabilizer alone or mixed with a buffer solution. Wherein R is an alkyl group having 1 to 6 carbon atoms, R 'is an alkyl group having 1 to 5 carbon atoms or an acyl group having 1 to 4 carbon atoms. The method of claim 1; The buffer solution is a normal temperature dried inorganic coating composition using a pH control, characterized in that the pH range of pH = 6.5 ~ 7.3 consisting of a conjugate acid and its base. The method of claim 1; The alkaline solution is a room temperature dried inorganic coating composition using a pH control, characterized in that pH 7.5 ~ 10. The method of claim 1; The lower alcohol is a room temperature dried inorganic coating composition using a pH control, characterized in that using at least one selected from the group consisting of methanol, ethanol, propanol, isopropylol, n-butanol, isobutanol. The method of claim 1; The organic acid or inorganic acid is a room temperature dried inorganic coating composition using a pH control, characterized in that at least one selected from the group consisting of phosphoric acid, hydrochloric acid, sulfuric acid, nitric acid, acetic acid, formic acid. The method of claim 1; The inorganic filler is characterized by adding at least one selected from potassium titanate, aluminum borate whisker, alumina, silicon nitride, silicon carbide, whisker of silica-alumina, fine powder of glass fiber, carbon fiber, porous inorganic antimicrobial fine powder, and inorganic rust inhibitor. Room temperature drying inorganic coating composition using a pH control. The method of claim 1; The inorganic pigment is a room temperature dried inorganic coating composition using a pH control, characterized in that at least one selected from rutile titanium oxide pigments and mica-titanium oxide-based non-toxic pearl pigments. Hydrolyzing alkoxysilanes with colloidal oxides and organic or inorganic acids; Adding an alcohol, a filler and a pigment to the reaction solution and stirring the grinder to have an average particle size of 10 μm or less; After the stirring is completed, washing it with alcohol; After the alcohol wash, adding an alkaline solution, a buffer solution alone or mixed with a pH stabilizer to stabilize the pH of the paint, the room temperature drying inorganic coating composition manufacturing method using a pH control. Adding a colloidal oxide and an organic acid or an inorganic acid to an alkoxysilane, followed by hydrolysis, and adding an alcohol to the hydrolyzed reaction solution and adding an alkaline solution and a pH stabilizer alone or mixed to form a resin part; Adding an inorganic filler and a pigment to the alcohol, stirring the powder to a particle size of 10 μm or less, and then washing with alcohol to produce a pigment portion; Room temperature drying inorganic coating composition using a pH control, characterized in that the step consisting of mixing the resin and the pigment. Use of the room temperature drying inorganic coating composition using pH adjustment, characterized in that the coating film is formed on the surface of the building interior and exterior materials by the inorganic coating composition of any one of claims 1 to 9.

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