KR100559052B1 - Natural Inorganic Coating Composition and Method of Preparing The Same - Google Patents

Abstract

Disclosed are a natural inorganic coating composition having excellent coating strength and excellent weatherability and a method of preparing the same. The composition is 12 to 32% by weight of the potassium silicate resin, 5 to 30% by weight of the auxiliary resin, 30 to 50% by weight of the white pigment and the sieving pigment, 0.3 to 5.0% by weight of the wet dispersant, stabilizer, thickener and other additives, and 10 to 30% by weight of water. It is formed by mixing in the ratio of. The natural inorganic paint having such a composition can be used as a top coating for interior and exterior of buildings, and exhibits good drying property, workability, and water resistance, and in particular, provides excellent coating strength and weather resistance.

Description

Natural Inorganic Coating Composition and Method of Preparing The Same

The present invention relates to a natural inorganic coating composition and a method for producing the same, and more particularly, to a natural inorganic coating composition excellent in storage stability, hardness and weather resistance of a coating film coated on an inorganic material such as concrete, and a method for producing the same.

At present, building structures mainly composed of concrete materials are applied with styrene acrylic emulsion paints or vinyl modified styrene acrylic emulsion paints to provide a plastering effect and durability improvement effect. Although these types of paints have many advantages, they use organic emulsion-based resins as binders, which makes them less effective in penetrating into concrete materials than silicate resins. There is a disadvantage in that the bonding strength.

In other words, emulsion-based paint can be applied to the surface of concrete to exhibit only a slight surface penetration effect, but silicate-based paint easily penetrates into the concrete through concrete pores and chemically hardens with calcium hydroxide, which is a major component of concrete. In addition, since the emulsion-based paint is less breathable through the coating there is a disadvantage that the mold resistance and long-term durability falls. This breathability is a necessary performance for historic building structures and requires a level of breathability that will not interfere with water vapor or air as it moves through the coating.

As one of the methods for solving this problem, a method using an inorganic binder may be proposed. The inorganic binder can compensate for a certain level of disadvantages of the organic emulsion binder described above. In the inorganic binder, silicate resin is composed of silicon, oxygen, and alkali metal salts. These components are the most common materials on earth and are considered to be very environmentally friendly in terms of nature and environment protection.

Representative silicate-based resins include sodium silicate, potassium silicate, and lithium silicate. In the case of inorganic paints using sodium silicate resin, the reaction of sodium silicate occurs relatively quickly on the concrete surface. It is not only whitening phenomenon on the concrete surface by forming a hydrated material when left in contact with water or in contact with water, but also in the initial stage when the coating film is cured.

In addition, in the case of the conventional inorganic paint using a potassium silicate or a lithium silicate resin, a similar but lesser problem than the case of the inorganic paint using the above-described sodium silicate resin may appear. In addition, the problems that may be caused by the strong alkali properties of the potassium silicate resin and the morphology of the resin also appear easily. Problems include poor compatibility with other general aqueous resins, making it difficult to select auxiliary resins that can compensate for the shortcomings of potassium silicate resins, poor pigment dispersibility and long-term storage stability for coating. Therefore, after long time storage test, the coating state is not uniform and phase separation or precipitation phenomenon occurs severely, and it may not be used. Moreover, when contacting with water again after forming a coating film, the binder release property, the fall of coating film strength, etc. may also occur.

That is, according to the type and content of silicate resin, auxiliary resin and pigments applied to natural inorganic paints, there are many problems in that the physical properties of the coating film such as dryness, water resistance, workability and storage stability are not only different. More problems arise in strength and accelerated weathering.

Accordingly, an object of the present invention for solving the problems described above is a natural inorganic coating composition having excellent drying properties, coating workability, water resistance and storage stability, and excellent coating strength and accelerated weather resistance, and does not contain an organic solvent component. To provide.

In addition, another object of the present invention described above is to provide a method for producing a natural inorganic paint that is excellent in dryness, paintability, water resistance and storage stability, and in particular, has excellent coating strength and accelerated weather resistance and does not contain an organic solvent component. It is.

The natural inorganic coating composition of the present invention for achieving the above object is 12 to 32% by weight of the potassium silicate resin, 5 to 30% by weight of the auxiliary resin 30 to 50% by weight of the white pigment and sieving pigment, wet dispersant, stabilizer, thickener and Other additives include 0.3 to 5.0 weight percent and 10 to 30 weight percent water.

In particular, the butylacryl / styrene copolymer having a solid content of 48 to 52% by weight, an emulsion average particle size of 150 nm, a minimum film forming temperature of 2 to 4 ° C, and a solid content of 48 to 52% by weight, and an emulsion average particle Preference is given to using butylacryl / styrene copolymers or mixtures thereof having a size of 100 nm and a minimum film forming temperature of 18 to 22 ° C.

In addition, the method for producing a natural inorganic paint of the present invention for achieving the above another object comprises the steps of mixing 10 to 30% by weight of water and 0.3 to 5.0% by weight of an additive to form a first mixture; Adding a white pigment and a sieving pigment to 30 to 50% by weight to the first mixture to form a second mixture; And sequentially mixing 5 to 30% by weight of the auxiliary resin, 12 to 32% by weight of the potassium silicate resin, and a stabilizer to the second mixture to form a natural inorganic paint.

The natural inorganic paints formed by such compositions and methods not only have better storage stability than conventional potassium silicate resins, but also have characteristics of improving coating strength and accelerated weathering resistance.

Hereinafter, the present invention will be described in more detail.

Natural Mineral Paint Composition

The natural inorganic paint composition of the present invention is formed by mixing a potassium silicate resin with an appropriate amount of auxiliary resins, coloring pigments, extender pigments, additives (wet dispersant, stabilizer, thickener and antifoaming agent) and water.

Potassium silicate resin applied to the natural inorganic coating composition has a molar ratio of silicon dioxide (SiO₂) and potassium oxide (K ₂ O) contained in the potassium silicate (2.6 to 4.0), the solid content of 20 to 32 weight Resin is used. More preferably, a resin having a molecular ratio of 3.2 and a solid content of 30% by weight of silicon dioxide (SiO₂) and potassium oxide (K ₂ O) is used.

If the composition of the potassium silicate resin with respect to the natural inorganic coating composition is 12% by weight or less based on the weight of the composition, the hardness of the natural inorganic coating film is not preferable, and if the composition exceeds 32% by weight, the natural inorganic coating film is easily It is not preferable because breakage occurs.

Therefore, the potassium silicate resin should have a composition in the range of 12 to 32% by weight of the natural inorganic paint composition, and preferably have a composition of 18 to 26% by weight.

The auxiliary resin applied to the natural inorganic coating composition has a solid content of 48 to 52% by weight, an emulsion average particle size of 130 to 170 nm, and a minimum film forming temperature (MFFT) of 1 to 5 ° C. Butyl acrylate / styrene copolymer (Butyl acrylate / Styrene copolymer), the solid content is 48 to 52% by weight, the average particle size of the emulsion is 80 to 120nm, the minimum film forming temperature (MFFT) Butyl acrylate / styrene copolymer (Butyl acrylate / Styrene copolymer) having a range of 15 to 25 ℃ is used alone or mixed.

The auxiliary resins mentioned above can be easily mixed because they are very compatible with potassium silicate resins, unlike ordinary acryl copolymers. At this time, when the wet dispersant or stabilizer is used in combination, the compatibility thereof is further increased.

When the composition of the auxiliary resin with respect to the natural inorganic paint composition is 5% by weight or less based on the weight of the composition, not only the painting workability of the natural inorganic paint is lowered, but also the whitening of the natural inorganic paint film occurs or the initial water resistance is lowered. It is not preferable because it is generated, and if the composition is more than 30% by weight, it is not preferable because the problem that the natural inorganic paint penetrates into the base of the concrete is poor and the air permeability decreases, causing the coating film to swell.

Therefore, the auxiliary resin should have a composition in the range of 5 to 30% by weight of the natural inorganic coating composition, and preferably have a composition in the range of 10 to 20% by weight.

Pigments applied to the natural inorganic coating composition include a coloring pigment and extender pigments. The coloring pigment mainly uses titanium dioxide on a white basis, and as a sieving pigment, calcium carbonate, talc, aluminum silicate, mica, silica, barium sulfate, magnesium silicate, and three-component inorganic pigments generally used in the paint industry ( Raw materials such as quartz, mica and chromide) can be used. Herein, the three-component inorganic pigment is a special inorganic pigment (plastorit, Luzenac) containing quartz, mica and chromide material.

Among them, calcium carbonate or three-component inorganic pigments are used as main sieving pigments, and talc and silica as auxiliary sieving pigments are most preferable in consideration of water resistance and paintability.

The composition of the white pigment is preferably 5 to 20% by weight based on the weight of the natural inorganic paint composition, and the composition of the extender pigment is 20 to 40% by weight based on the weight of the natural inorganic paint composition. It is preferable to use.

In addition, the total composition of the white pigment and the extender pigment is less than 30% by weight based on the weight of the natural inorganic paint composition, which is not preferable because a problem occurs that the whiteness of the natural inorganic coating film is reduced or the hiding effect of the coating film is decreased. If the content exceeds 50% by weight, the natural inorganic coating film is not firm, and adhesion, workability, water resistance and storage stability are greatly reduced, and the weathering property may cause a choking phenomenon such as pigments on the coating film surface. not.

Therefore, the total composition of the white pigment and the extender pigment on the basis of the white paint should be in the range of 30 to 50% by weight, preferably 35 to 45% by weight of the natural inorganic paint composition.

In addition, additives applied to natural inorganic coating compositions include a wet dispersant, a stabilizer, a thickener, and the train additive includes a viscosity stabilizer, an antifoaming agent, a pH adjusting agent, and the like.

Here, the wet dispersant is preferably used in the phosphate solution and quaternary ammonium solution having a solid content of about 50% by weight based on the weight of the natural inorganic road composition 0.01 to 0.5% by weight.

The stabilizer is preferably a silanol compound stabilizer having a solid content of about 50% by weight based on 0.01 to 0.5% by weight based on the weight of the natural inorganic road composition.

The thickener is preferably 0.05 to 0.7% by weight of a hydroxyethyl cellulose component based on the weight of the natural inorganic road composition in a solution of powdered hydroxyethyl cellulose in water. At this time, the other additive is preferably used 0.01 to 0.5% by weight based on the weight of the natural inorganic road composition.

Manufacturing method of natural inorganic coating composition

The natural inorganic coating composition of the present invention is prepared by mixing water, an additive, a white pigment, an extender pigment, an auxiliary resin, a potassium silicate resin, and other additives, and the natural inorganic coating composition thus prepared is dry, paintable, It is excellent in water resistance and storage stability, and especially in coating film strength and accelerated weathering resistance.

Referring to the manufacturing method of the natural inorganic coating composition in detail, first the first mixture having a uniform mixing state by mixing 10 to 30% by weight of water and 0.3 to 5.0% by weight of an additive including a wet dispersant, an antifoaming agent, a water repellent, a thickener To form.

Herein, a phosphate solution and a quaternary ammonium solution were used as the wet dispersant, thiog-810 was used as the antifoaming agent, and hydroxyethyl cellulose was used as the thickener.

Subsequently, 30-50 wt% of the white pigment and the extender pigment are added to the first mixture to disperse rapidly to form a second mixture. The fast dispersion is performed until the particle size is 5 or more.

Subsequently, when the particle size of the second mixture is 5 or more, 5 to 30% by weight of the auxiliary resin, 12 to 32% by weight of the potassium silicate resin, and a storage stabilizer are sequentially added, mixed to have a uniform state, and then filtered. An inorganic coating composition was formed. Since the properties of the auxiliary resin and the potassium silicate resin are described in detail above, they will be omitted to avoid duplication.

The improvement of the coating film strength and the accelerated weathering resistance of the natural inorganic paint produced by the inventive technique of the present invention will be described in more detail with reference to the following Examples, which indicate that the scope of the present invention is not limited to these Examples.

Example 1

0.3 wt% of phosphate solution (Sapetin D20, Welner silicate) as a wet dispersant, 0.3 wt% of Quarterly Ammonium solution (Betolinquart-25, Welner silicate), and defoamer (Tego-810, Tigo) 0.2 in 13.9 wt% of water 10% by weight and 1.5% by weight of water repellent (Phobe 1400, Tigo) were made, and a uniform solution was added. 0.5% by weight of hydroxyethyl cellulose (Cellosize ER-4400, Union Carbide) was added as a thickener. High speed dispersion for minutes.

Next, 10% by weight of white pigment (TiO₂R-706, DuPont), 25.0% by weight of calcium carbonate (Omyacarb 5, Omiya), 8.0% by weight of talc (Talc SA-400, Youngwoo Chemtech), silica (Syloid 74, Grace) 1.0% by weight is added and dispersed rapidly.

Subsequently, the particle size was dispersed to 5 or more, followed by 10.0% by weight of a butylacryl / styrene copolymer (Acronal S-559, BASF), 25% by weight of potassium silicate resin (Betolin P-35) , Storage stabilizer (Betolin A11, Welner silicate) was added in order, mixed until uniform, and then filtered and packaged to obtain a natural inorganic paint having an initial viscosity of 90 KU and a solid content of 58 wt%. .

Example 2

Performed in the same manner as in Example 1, except that 10.0% by weight of butylacryl / styrene copolymer (Acronal S-559, BASF) having a minimum film forming temperature of about 3 ° C. has a minimum film forming temperature of about 20 ° C. By using 10.0% by weight of a butylacryl / styrene copolymer (Acronal 296DF, BASF), a natural inorganic paint having an initial viscosity of 90 KU and a solid content of 58% by weight was obtained.

Example 3

Perform the same method as in Example 1, except that 10.0% by weight of butylacryl / styrene copolymer (Acronal S-559, BASF) and 8.0% by weight of talc (Talc SA-400, Youngwoo Chemtech) are used. The initial viscosity is 20.0 wt% of butylacryl / styrene copolymer (Acronal 296DF, BASF) and 3.0 wt% of special inorganic pigment (Plastorit, Luzenac) consisting of quartz, mica, and chromite. It was 92 KU, and a natural inorganic paint having a solid content of 58% by weight was obtained.

Comparative Example 1

Perform the same method as in Example 1, but instead of using 8.0% by weight of Talc (Talc SA-400, Youngwoo Chemtech) and 1.0% by weight of silica (Syloid 74, Grace) 9% by weight of mica (Mica SX-300) By using this, a natural inorganic paint having an initial viscosity of 94 KU and a solid content of 58 wt% was obtained.

Comparative Example 2

Perform the same method as in Example 1, using 10.0% by weight of white pigment (TiO₂R-706, DuPont), 25.0% by weight calcium carbonate (Omyacarb 5, Omiya), 8% by weight of talc (Talc SA-400, Youngwoo Chemtech) Instead of using a white pigment (TiO₂R-902, DuPont) 18.0% by weight, calcium carbonate (Omyacarb 5, Omiya) 24.0% by weight, talc (Talc SA-400, Youngwoo Chemtech) using 5.5% by weight, the initial viscosity is 92KU, A natural inorganic paint having a solid content of 58% by weight was obtained.

Experimental Example 1

The composition prepared in Examples 1, 2, 3 and Comparative Example 1 and Comparative Example 2 of the present invention was dried twice for 7 days by painting with a brush or a roller so that the dry film thickness was about 100 μm on the test concrete specimen. It was made. The performance of the dried coating film was evaluated for dryness, workability, water resistance, 50 ° C. storage stability, and accelerated weather resistance according to the test method of KSM 5000, and relative evaluation of choking resistance and coating film strength was performed. The test results are shown in Table 1 below.

Test evaluation result of natural inorganic paint division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Appearance Dryness Workability Good good good Good good good Good good good Normal good bad Good good good Water resistance Good Good Good Bad Good Storage stability at 50 ℃ (viscosity rise rate) Good (△ 3.9%) Good (△ 4.6%) Good (△ 3.8%) Poor (△ 25.5%) Good (△ 3.8%) Weathering resistance Great Great Great Bad Good Choking Great Great Great Bad Good Coating strength Good Great Great usually usually

The present invention is a natural inorganic paint composition is prepared by mixing a suitable amount of auxiliary resin, coloring pigments, extender pigments, wetting dispersants, stabilizers and other additives in the potashium silicate resin as well as good storage stability compared to the conventional potassium silicate resin Excellent coating strength and accelerated weather resistance.

In addition, the coating material formed from the above-described composition is not only excellent in workability, water resistance, 50 ° C. storage stability, choking property, coating film strength, viscosity increase rate, but also in appearance and drying property of the coating film formed.

In addition, it is possible to improve problems such as labor hygiene problems, organic solvent odor and fire hazards that are problems with conventional oil-based paint composition.

Claims (9)

12 to 32% by weight of a potassium silicate resin having a molar ratio of silicon dioxide and potassium oxide of 2.6 to 4.0 and a solid content of 20 to 32% by weight ; Butylacryl / styrene copolymer having a solid content of 48 to 52% by weight, an emulsion average particle size of 150 nm, a minimum film forming temperature of 1 to 5 ° C., a solid content of 48 to 52% by weight, and an emulsion average particle 5 to 30 % by weight of an auxiliary resin comprising a butylacryl / styrene copolymer or a mixture thereof having a size of 100 nm and a minimum film forming temperature of 15 to 25 ° C . ; 30 to 50% by weight of the pigment mixture including 5 to 20% by weight of the white pigment and 20 to 40% by weight of the extender pigment ; And 0.3 to 5.0% by weight of an additive consisting of a wet dispersant, an antifoaming agent, a water repellent, and a thickener; And Natural inorganic coating composition comprising 10 to 30% by weight of water. delete delete The method of claim 1, wherein the extender pigment comprises at least one of calcium carbonate, talc, aluminum silicate, mica, silica, barium sulfate, magnesium silicate, silica, and three-component inorganic pigments (quartz / mica / chromide). Natural inorganic coating composition characterized by. delete (a) mixing 10 to 30% by weight of water with 0.3 to 5.0% by weight of an additive comprising a wet dispersant, a thickener, a viscosity stabilizer and an antifoaming agent to form a first mixture; (b) adding 30 to 50% by weight of the pigment mixture including 5 to 20% by weight of the white pigment and 20 to 40% by weight of the extender pigment to the first mixture to form a second mixture; And (c) 5 to 30% by weight of the auxiliary resin, 12 to 32% by weight of the potassium silicate resin and the stabilizer are sequentially mixed with the second mixture to form a natural inorganic paint, The Potassium silicate resin has a molar ratio of silicon dioxide and potassium oxide in the range of 2.6 to 4.0, a solid content of 20 to 32% by weight, The auxiliary resin has a solid content of 48 to 52% by weight, an average particle size of the emulsion of 150 nm, a butylacryl / styrene copolymer having a minimum film forming temperature of 2 to 4 ° C, a solid content of 48 to 52% by weight, and an emulsion. A method for producing a natural inorganic coating composition, characterized in that the average particle size is 100nm, the minimum coating film formation temperature 18 to 22 ℃ butylacryl / styrene copolymer or a mixture thereof . delete delete delete