KR100602464B1 - Water paint composition - Google Patents

Abstract

The aqueous coating composition is 3 to 8% by weight of the amethyst powder, 5 to 25% by weight of the extender pigment, 10 to 25% by weight of the coloring pigment, 10 to 30% by weight of the binder resin, 0.1 to 1% by weight of the modified cellulose thickener, wet dispersant, preservative At least one additive selected from the group consisting of an antifoaming agent, a pH adjusting agent, an antimicrobial agent, a surface adjusting agent and an anti-sticking agent, and 0.3 to 5 wt% of excess water. The water-based paint composition can perform excellently the function of the white paint while maintaining the intrinsic properties of amethyst and can improve the physical properties of the paint composition, such as other storage stability.

Description

Water-based paint composition {WATER PAINT COMPOSITION}

The present invention relates to an aqueous coating composition containing amethyst. More particularly, the present invention relates to an aqueous coating composition capable of stably performing the function of a white paint while having the intrinsic properties of amethyst.

Due to the accelerated industrialization, modern chemicals have been flooded with various chemicals, causing a new syndrome called sick house syndrome. In order to solve these problems, it is necessary to minimize the formaldehyde and volatile organic compounds, which are the most significant causes of sick house syndrome, in building materials.

Many paint companies have developed waterborne paints containing little formaldehyde and volatile organic compounds, and now sell additional functional paints beyond simply reducing environmental pollutants.

Therefore, various functional materials can be included in the paint. These materials are mainly extracted from minerals, and have a color of their own, which makes it difficult to manufacture a white paint while adding a content to exhibit the above-described functions.

Among them, the amethyst, which emits the most far infrared rays among the minerals present on earth, has its own regular wave, which stabilizes the EEG and human blood flow, and is effective in antibacterial and deodorization. However, the amethyst mineral itself has a reddish purple color. There was a problem in whitening the paint while exhibiting the functions described above. In addition, amethyst, which is generally used in non-jewelry industries, uses imported powder, which is produced from limestone rocks or sand, which contains impurities, and heavy metals and radioactivity are detected.

In addition, the amethyst has a large particle size and a high hardness has a problem of having a rough coating appearance when manufacturing interior paints and a problem of precipitation and association with other pigments during storage due to excessively large particles. In order to solve this problem, there is a method of preventing sedimentation by providing high thixotropy to the paint, but in order to minimize volatile organic compounds due to the eco-friendly nature of the paint, a urethane thickener and an acrylic acid type thickener, which are used as a paint thickener, are in powder form. Phosphorus thickener should be used, which generally has a characteristic of lowering the leveling of the paint, which is a factor that causes a poor condition of the dry coating together with the coarse grains of amethyst. In addition, when using the cellulose thickener alone, there is a problem that a lot of sporadic sporadic spawning.

The present invention in consideration of the problems of the prior art as described above provides an aqueous coating composition capable of performing a stable function as a color coating while maintaining the functional properties of amethyst.

The aqueous coating composition according to one feature of the invention comprises an amethyst powder having an average particle diameter of 2 to 20 μm and which does not release radioactivity.

The aqueous coating composition according to one feature of the present invention is 3 to 8% by weight of the amethyst powder, 5 to 25% by weight of the extender pigment, 10 to 25% by weight of the pigment, 10 to 30% by weight of the binder resin, modified cellulose thickener 0.1 to 1 Weight percent, other additives and excess water. The other additives include a wet dispersant, a preservative, an antifoaming agent, a pH adjusting agent, an antibacterial agent, a surface adjusting agent and an anti-sticking agent, and the additives include 0.3 to 5 wt% in the total coating composition.

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

The amethyst powder comprises 3 to 8% by weight in the total coating composition. If the amethyst powder is less than 3% by weight, functional properties inherent to the amethyst cannot be expressed, whereas if it exceeds 8% by weight, the whiteness of the color of the entire coating composition is significantly lowered due to the intrinsic color of the amethyst.

In addition, the average particle diameter of the amethyst powder is preferably 0.2 µm to 20 µm. The smaller the average particle diameter is better for the dry coating state of the paint molding, but when the powder of less than 0.2 μm is added, the oil absorption becomes high, and the storage stability of the coating composition is poor. On the other hand, when the average particle size exceeds 20 μm, the surface of the dry coating film is This roughness is not suitable for interior paints and there is a problem that precipitation occurs during storage.

In general, amethyst used for industrial use uses a lot of imported powder, which is produced from limestone or sand, and contains impurities such as heavy metals, and a small amount of radioactivity may be detected. In order to solve this problem, the water-based coating composition according to an aspect of the present invention is mined as a raw material mainly composed of ganban rock in loess mud rock and contains a domestic amethyst powder containing no heavy metals and radioactivity.

Titanium dioxide is used as a coloring pigment based on white, and calcium carbonate, talc, aluminum silicate, diatomaceous earth, mica and the like are used as a sieving pigment. The aqueous coating composition preferably comprises aluminum silicate as a main component of the sieving pigment and diatomaceous earth as an auxiliary sieving pigment. The aqueous coating composition according to the formulation is very excellent in the effect of improving the whiteness, hiding power and side gloss.

The content of the colored pigment based on the white paint is preferably included 10% to 25% by weight based on the total weight of the coating composition. If the content is less than 10% by weight can not cancel the intrinsic color of the amethyst powder gray, whereas if it exceeds 25% by weight, whiteness and hiding power is reduced. The extender pigment is preferably used 5% by weight to 25% by weight.

The total composition of the coloring pigment and the extender pigment is preferably in the range of 30% by weight to 50% by weight based on the weight of the paint. If the content is less than 30% by weight, the whiteness and concealment effect of the coating film is not preferable, and if the content is more than 50% by weight, the coating film is not firm, and adhesion, workability, water resistance, and storage stability are not preferable. . Therefore, the total content of the coloring pigments and extender pigments based on the white paint is in the above range, more preferably 35% to 45% by weight.

In order to prevent precipitation of the pigment, which is one of storage stability problems, the aqueous coating composition includes a thickener for imparting thixotropy. In order to maintain environmentally friendly properties of the paint, the water-based paint composition is a powder type cellulose type thickener excluding the urethane type thickener and the acrylic acid type among the general thickeners used in the aqueous coating composition to minimize volatile organic compounds. Include. In particular, hydroxy ethyl cellulose (Hydroxy ethyl cellulose) in the cellulosic thickener is excellent in the thixotropy, but when used alone, poor leveling and spattering occurs in workability, which causes problems as interior paints of the present invention. Aqueous coating composition according to one feature comprises modified ethyl hydroxyethyl cellulose (Modified ethyl hydroxy ethyl cellulose). Therefore, the aqueous coating composition is excellent in leveling and workability and good storage stability.

As the binder resin, a butylacryl / styrene copolymer having a solid content of 48% by weight to 52% by weight and an average particle diameter of the emulsion ranging from 50 nm to 250 nm is used. The butylacryl / styrene copolymer generally has a minimum film forming temperature (MFFT) of about −5 to 10 ° C. in order not to use a film forming agent which is a volatile organic compound. More preferably, a butylacryl / styrene copolymer having a solid content of 50% by weight, an emulsion average particle diameter of 150 nm and a minimum film forming temperature of about 3 ° C is used.

In addition, the coating composition of the present invention includes a wet dispersant, a preservative, an antifoaming agent, a pH adjusting agent, an antibacterial agent, a surface adjusting agent, an adhesion promoter, and the like. As the wet dispersant, a polycarboxylic acid type having a solid content of 40% by weight is used. The wet dispersant is preferably contained 0.5% to 1% by weight relative to the total coating composition. In addition, the additives other than the wet dispersant are preferably contained 0.05% to 0.5% by weight relative to the total coating composition.

Hereinafter, embodiments of the present invention will be described in detail. However, the content of the present invention is not limited by the following examples.

Example 1

Into the paint mixing flask was charged 31% by weight of water, 0.7% by weight of wet dispersant 0.25% by weight of antifoam, 0.08% by weight of preservative, 0.1% by weight of antibacterial and 14% by weight of titanium dioxide pigment, 3% by weight Diatomaceous earth, calcium carbonate having an average particle diameter of 1 μm of 10% by weight, calcined clay of 1.4 μm of 5% by weight, 8% by weight of amethyst powder having a particle size of 25 μm were added and dispersed rapidly at a particle size of 4 or more. In order not to use 0.3 wt% hydroxyethyl cellulose type thickener and volatile organic film forming agent, solid content is 50 wt%, emulsion average particle size is 150 nm and minimum film forming temperature (MFFT) A butylacryl / styrene copolymer having a 3 ° C is used.

Example 2

It was prepared in the same manner as in the aqueous coating composition of Example 1, except that 29% by weight of water, 16% by weight of titanium dioxide as a white pigment, and 8% by weight of amethyst powder having a 10 μm particle diameter were used.

Example 3

Water-based paints of Example 1 except 18 wt% of titanium dioxide pigment, 3 wt% of diatomaceous earth, 10 wt% of calcined clay of 1.4 μm, 5 wt% of amethyst powder having a 10 μm average particle diameter, and 20 wt% of acrylic emulsion binder resin. It was prepared in the same manner as the composition.

Example 4

It was prepared in the same manner as in the aqueous coating composition of Example 3, except that modified hydroxyethyl cellulose (Bermocoll EHM300, AKZO NOBEL) was added instead of hydroxyethyl cellulose (Celosize ER-4400, Union Carbide).

Example 5

A thickening agent was used in the same manner as in the aqueous coating composition of Example 4, except that 0.25 wt% was used and 0.2 wt% of a pH adjuster was added.

Comparative Example 1

Performed in the same manner as in Example 1, except for the amethyst powder to prepare an aqueous coating composition.

Comparative Example 2

In the same manner as in Comparative Example 1, 18 wt% of white pigment, 7 wt% of calcium carbonate having a particle size of 1 μm, 3 wt% of diatomaceous earth, 5 wt% of 1.4 μm of calcined clay, and 10 μm of particle size An aqueous coating composition was prepared using 5% by weight of ocher.

Experimental Example 1

Various physical properties were measured for the aqueous coating compositions prepared in Examples 1 to 5 and Comparative Examples 1 and 2. The measured physical properties were dry film appearance, 45 ° 0 ° diffuse reflectance, concealment rate, water resistance, coating workability, dichroism, dispersibility (N.S), 60 ° C. storage stability, human blood flow and EEG stability. The evaluation of physical properties excluding 60 ° C. storage stability was evaluated in four stages: volume-normal-good-excellent, and storage stability was evaluated in four steps of precipitation-normal-good-excellent.

The dispersant wetting agent used in this experiment was SN-DISPERSANT-44S (trade name) manufactured by Novov Korea, antifoam agent was BYK-024 (trade name) manufactured by BEIKAI, preservative agent was Proxel XL-2 (trade name) manufactured by Genca, and antibacterial agent was used by THOR company. EPW (brand name) thickener is Akzo Nobel's Bermocal EHM300 (brand name), pH adjuster is Angus Amp-95 (brand name), titanium dioxide is DuPont R-706 (brand name), diatomaceous earth is Celite 499 (brand name) The firing clay used SNOWTEX 45 (trade name) of Texas Industrial, the amethyst powder of AM-TEC POWDER (trade name) of Amethyst Korea, and the Acronal S-559 (trade name) of BASF Corporation of butylacryl / styrene copolymer. .

Paint property test

The coating compositions prepared in Examples and Comparative Examples were subjected to experiments and test piece preparation by the method of two coats on a slate plate. Among the test methods, water resistance, dispersibility, storage stability at 60 ° C, hiding rate, and 45 ° 0 ° diffusion reflectance (whiteness) were evaluated according to the test method of KSM 5000.

1. Appearance of dry coating

It was confirmed visually whether the coating film of the coating film of the dry coating specimen coated twice with the roller coating and leveling state.

2. Dichroic

3% of a general aqueous colorant was added to the coating compositions of Examples and Comparative Examples, and the dichroism was confirmed through comparison of the color difference between one coat and two coats.

3. Painting workability

The state of Laura at the time of coating, the state of a wet coating film, and sputtering were visually judged through a roller sheet on a slate plate.

The measurement results are shown in Table 1 below.

division Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Dry coating appearance usually usually Good Good Great usually usually 45 ° 0 ° Diffuse Reflectance (%) 75 77 82 83 84 74 73 Concealment rate (%) 0.88 0.89 0.95 0.97 0.97 0.89 0.86 Water resistance Good Good Good Good Good Good Good Painting workability usually usually usually Good Great usually usually Dichroic Good Good Good Good Good Dichroic Dichroic Dispersibility (N.S) usually usually usually Good Good usually usually 60 ° C storage stability Sedimentation Sedimentation Sedimentation Sedimentation Great Sedimentation Sedimentation Human Blood Flow and EEG Stability Good Great Great Great Great Bad Bad

Referring to Table 1, the coating composition of the Example, the physical properties were measured better than the comparative example. However, for a more detailed comparison, the present invention was variously applied with a slight modification to the embodiment, and the most preferable example is Example 5.

In Example 1, since the amethyst powder having a large particle size (25 μm) was used, the dry coating was rough and the whiteness was lowered. In addition, precipitation occurred during high temperature (60 ° C.) storage and dispersibility was reduced.

In Example 2, the particle size of the amethyst powder was replaced with 10 μm and the titanium dioxide was increased to 16 wt% to increase the hiding power, but the hiding power and the whiteness were not remarkably improved.

In Example 3, the titanium dioxide was increased to 18% by weight and the amethyst powder was reduced to 5% by weight to improve the appearance, whiteness and hiding rate of the dry coating, but precipitation occurred during storage at high temperature (60 ° C.) and during coating work. Spattering occurred.

Improved spattering and leveling during painting work using modified hydroxyethyl cellulose (Bermocoll EHM300, AKZO NOBEL) instead of hydroxyethyl cellulose (Cellosize ER-4400, Union Carbide) used as thickener in Example 4 However, precipitation occurred during high temperature (60 ° C.) storage.

In Example 5, the pH control agent AMP-95 of the amines that contribute to the stability of the paint was added to improve the high temperature (60 ° C.) storage stability.

In Comparative Example 1 and Comparative Example 2, the inherent properties of the amethyst powder were not expressed.

The aqueous coating composition according to the present invention contains amethyst powder so that the functional properties of the amethyst powder can be stably expressed in the coating composition. In addition, the function of the white paint can be stably realized by offsetting the color of the amethyst.

In addition, the paint properties such as appearance, storage stability, workability, water resistance, whiteness, hiding power of the dry coating film is very excellent.

As described above, although described with reference to the preferred embodiment of the present invention, those skilled in the art will be variously modified without departing from the spirit and scope of the invention described in the claims below. And can be changed.

Claims (13)

delete 3 to 8% by weight of the amethyst powder having an average particle diameter of 0.2 to 20㎛, sieving pigment 5 to 25% by weight, coloring pigment 10 to 25% by weight, binder resin 10 to 30% by weight, thickener 0.1 to 1% by weight, wet dispersant An aqueous coating composition comprising 0.3 to 5% by weight of at least one additive selected from the group consisting of a preservative, an antifoaming agent, a pH adjusting agent, an antimicrobial agent, a surface control agent and an anti-sticking agent and excess water. delete The aqueous coating composition according to claim 2, wherein the extender pigment comprises at least one extender pigment selected from the group consisting of calcium carbonate, talc, aluminum silicate, diatomaceous earth, and mica. 5. The aqueous coating composition according to claim 4, wherein the extender pigment contains the aluminum silicate as a main component and the diatomaceous earth as an auxiliary component. The aqueous coating composition according to claim 2, wherein the coloring pigment comprises titanium dioxide. The water-based coating composition of claim 2, wherein the binder resin comprises a butylacryl / styrene copolymer having a minimum film forming temperature of about -5 to 10 ° C. 8. The aqueous coating composition according to claim 7, wherein the binder resin has a solid content of 48 to 52 wt% and an emulsion average particle size of 50 to 250 nm. 3. The aqueous coating composition of claim 2, wherein the thickener comprises modified ethyl hydroxyethyl cellulose. The aqueous coating composition of claim 2, wherein the water dispersant comprises a polycarboxylic acid dispersant having a solid content of 38 to 42% by weight. The water-based coating composition of claim 2, wherein the water dispersant comprises 0.5 to 1 wt% in the total coating composition. The aqueous coating composition according to claim 2, wherein the additives other than the water dispersant are added in the range of 0.05 to 0.5% by weight in the total coating composition, respectively. The water-based paint composition of claim 2, wherein the total weight of the extender pigment and the pigmented pigment is 35 to 45% by weight relative to the total paint composition.