KR100559959B1 - Making process of water paint for architecture - Google Patents

Abstract

 The present invention relates to a method for producing an aqueous paint for construction.

When new houses or high-rise apartments are newly painted or renovated, new and new designs are used to construct new and renovated coatings. In the case of coating with water-based paints, the coating solution and labor cost of paints have risen due to the lack of concealing force and the thickness of the paint as an external coating material in the water market.

The present invention is a paint in which a styrene acryl emulsion having a high solid content (a substance left by volatile solvent) is mixed with a spherical hollow lightweight silica and a spherical bubble resin to maximize the volume solids of the paint and the difference in refractive index by air. Its purpose is to provide a manufacturing method of water-based paint for construction that can be finished by one-time painting by maximizing the hiding power by maximizing the concealing power and increasing the concealing power and dry film thickness with only one painting when painting with spray, brush, roller, etc. have.

 Water-based paints, hiding power, solids, bubble resins, lightweight silica.

Description

Manufacturing method of water-based paints for construction {MAKING PROCESS OF WATER PAINT FOR ARCHITECTURE}

The present invention relates to a method for manufacturing an aqueous coating material for building to improve solid content and hiding power, and more specifically, to introduce a spherical hollow lightweight silica and a spherical bubble resin capable of maximizing the difference in refractive index. By introducing a styrene acrylic emulsion with high solids (a substance that leaves volatile solvent), it minimizes the specific gravity of the paint to maximize the volume solids of the paint and maximizes the hiding power by the difference in refractive index by air. When coating with a roller (Roller), etc. The coating method of the coating to enable a thick film coating at a time and to increase the hiding power as possible.

 In recent years, new and new paintings have been newly constructed and renovated due to the diversification of consumer's needs in new housing or high-rise apartments. In the case of coating with water-based paints, external coatings for water-based coatings on the market have a dry film thickness of 35-40㎛ in one coating, so they need to be coated twice in order to maintain the thickness of 70-80㎛ due to lack of hiding power and coating thickness. Because of this, there was a problem that a lot of the coating cost and the burden of painting labor costs.

 As a method of maximizing the hiding power of conventional paints, a pigment having a relatively high refractive index was used. For example, titanium dioxide (refractive index 2.73, specific gravity 4.26) with high refractive index is used, and calcium carbonate (refractive index 1.63, average specific gravity 2.93), magnesium silicate (refractive index 1.65, average specific gravity 2.75), aluminum silicate (to increase the volume and filling density) Refractive index 1.58, average specific gravity 2.75) and the like.

However, when titanium dioxide is used, the hiding power is increased, but the price is high and at the same time, the specific gravity of the paint is increased, so that the volume solid content of the paint is not reduced or affected.

As a result, until now, water-based paints for general construction have a problem that can only be used twice.

 The present invention uses a spherical hollow lightweight silica and a spherical bubble resin in order to maximize the hiding power using the difference in refractive index in order to solve the problems as described above to increase the concealment by the refraction of light as thick as possible at the same time In order to design the thick film type paint, the specific gravity of the paint is minimized to increase the volume solids (SVR) to the maximum so that it is possible to finish the waterborne paint for construction, which has been applied twice, in one coat.

 In other words, it is possible to conceal one time and get a thick dry coating (50-60㎛) to minimize the labor cost of painting during construction coating, and to reduce the coating cost by significantly reducing the coating cost. The purpose is to provide a method.

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

 As a main body of the present invention, a spherical hollow weight silica having an average particle diameter of 30 to 40 µm in which particles were formed as independent spheres was used. This specific silica has an effective specific gravity of about 0.28, which is higher than titanium dioxide (specific gravity 4.26), calcium carbonate (average specific gravity 2.93), magnesium silicate (average specific gravity 2.75), and aluminum silicate (average specific gravity 2.75), which are commonly used as pigments in paints. Significantly lower, it can lower the specific gravity of the paint and increase the hiding power due to the difference in refractive index.

 Fig. (1) Comparison of Refraction of Styrene-Acryl Resin and Silica

As shown in Fig. (1), the spherical hollow lightweight silica is composed of a core-shell structure composed of a shell made of silica and an internal structure filled with air. The hiding power is increased by the scattering of light.

 Styrene Acrylic emulsion, a spherical bubble resin, is an opaque polymer and has a core-shell structure with fine particles having an average particle size of 0.4 to 0.5 μm.

In the emulsion, the interior space is filled with water, but when the coating film is dried, the water in the interior space evaporates and is replaced by air to contain air inside the particles.

This can increase the hiding power and volume solids on the same principle as spherical hollow weight silica. See picture (1)

Table (1) Refractive index of material used for general water paint

As shown in Table 1, general materials have inherent refractive indices, but when using spherical hollow weight silica or spherical bubble resins having a core-shell structure as described above, The concealment force can be greatly improved by scattering of light due to different refractive indices at the interface of -Shell). Especially, when the air has a small refractive index, the difference of the refractive indices becomes larger and the effect is greater.

Fig. (2) Cross-sectional comparison of light scattering between a high refractive film and a low refractive film

Fig. (2) shows the path of light movement in the film of high refractive index material and the film of low refractive index material using spherical bubble resin and spherical hollow weight silica. The refractive index of each component in the coating film increases the light scattering, which is more refracted than in the coating film having a low refractive index.

Therefore, light that penetrates the coating film containing a material having a high refractive index does not penetrate that much. Therefore, the coating film with high refractive index looks opaque and white when there are no particles absorbing light, and substantially all incident light is refracted and scattered in the coating film and reflected off the surface.

In this principle, the concealment force covering the coating part can be maximized by using the difference in refractive index.

An embodiment of the development process of the present invention is as follows.

According to the addition amount of the spherical hollow body lightweight silica and the spherical bubble resin which maximize the refractive index difference, it manufactured respectively in Example (1)-Example (3).

(1) Hydroxy Ethyl Cellulose (Elementis)

(2) polyacrylates [polyacrylate-based (Rom & Haas)]

(3) Anion system [Anion system (East South Hwaseong)]

(4) Ethylene Glycol

(5) modified silicone oil (San Nopco)

(6) Organic Nitrogen System (Sungsung Precision)

(7) styrene acrylic emulsion (60% solids)

(8) ester alcohol (yeast only)

(9) Acryl Bubble resin, solid content 38% (Rom & Haas)

(10) spherical hollow body lightweight silica (3M)

(11) rutile type (millennium)

(12) Aluminum silicate (Huber)

If the coating method of the embodiment is described in detail, the middle agent is mixed and stirred in 5.1% by weight of water, and the dispersing agent, the emulsifier, and the cryoprotectant are added in order and mixed. Then, titanium dioxide, aluminum silicate, spherical bubble resin, and spherical hollow light weight silica were added and stirred at a high speed of 50 µm or more at 2000 rpm.

After the high speed stirring, the low speed stirring below 1000rpm is mixed with the acrylic emulsion resin, the antifoaming agent, the preservative, and the film forming agent, and the viscosity is adjusted with water. If necessary, a colorant may be added to prepare a paint of a desired color. The prepared paint is filtered and packaged and kept sealed at room temperature.

Table (2) below compares the concealment rate and the physical properties of volume solids (SVR) of paints prepared according to the amount of spherical hollow lightweight silica and spherical bubble resins.

Table (2) Comparative test results of Examples

As shown in Table 2, the specific gravity is lowered and the hiding rate is increased as the amount of spherical hollow lightweight silica is increased.

However, since the spherical hollow lightweight silica had a specific gravity of 0.28, it was impossible to add more than 15% due to the critical volume (CPVC) in the paint.

In addition, as the amount of spherical bubble resin increased, the concealment rate increased, but the solid content was 37% and the specific gravity was 1.03. Therefore, the volume solid content (SVR) did not increase at more than 15%.

In order to compare the physical properties of the paint of Example 3) prepared in the present invention with commercially available external water-based paints, comparative experiments were performed.

Comparative Example 1) is a building aqueous outer KS1 grade and Comparative Example 2) a building aqueous outer KS2 grade. Table 3 shows the results of testing according to the KS standard.

Table (3) Comparative test results with general water-based paints

As shown in Table 3, Example 3) was 16 to 20% higher in nonvolatile content than Comparative Examples 1) and 2) and its specific gravity was similar to Comparative Examples 1 and 2, but the hiding rate was much higher.

In addition, it can be seen that the volume solid content of Example 3) is significantly different, so that the dry coating thickness is 1.5 times thicker than Comparative Example 1) and 1.8 times thicker than Comparative Example 2).

The present invention can maximize the concealment of the invisible part of the coating by using the difference in refractive index and increase the volume solids that combine the coating thickness after the volatile solvent is blown to form a thick dry coating film at one time (50-60㎛). In the case of the existing paint, it is possible to paint once the hassle of painting twice, thereby improving the painting work efficiency, reducing labor costs and greatly reducing the paint capacity.

Claims (2)

Medium weight 0.2% by weight Dispersant 0.7 wt% Emulsifier 0.4% by weight Cryoprotectant 0.8% by weight Antifoam 0.6 wt% Preservative 0.2 wt% Acrylic emulsion resin 22% by weight Coating agent 1.0 weight% 20% by weight of titanium dioxide Aluminum silicate 19% by weight A method for producing an aqueous paint for construction, comprising mixing 15 weight% of spherical hollow weight silica and 15 weight% of spherical bubble resin in an aqueous paint obtained by mixing 5.1 weight% of water. delete