KR101976687B1 - Cool paint composition comprising cenosphere - Google Patents

Abstract

The present invention relates to a heat-sensitive coating composition containing senospheres, which comprises 5 to 30 parts by weight of senospheres, 10 to 30 parts by weight of perlite, 40 to 30 parts by weight of titanium dioxide, 5 to 20 parts by weight of a solution prepared by dissolving natural polysaccharides in propylene glycol so that the solids content is 40 to 70% by weight, characterized by comprising 70 to 70 parts by weight, diatomaceous earth 2 to 20 parts by weight, solvent 30 to 80 parts by weight, Based coating composition.

Description

[0001] The present invention relates to a cool paint composition comprising cenospheres,

The present invention relates to heat shield coating compositions containing senospheres. More specifically, the present invention develops a paint having heat-insulating performance capable of lowering the indoor temperature of a building using a coal fly ash, which is generated from a coal-fired power plant, to reduce energy and prevent environmental pollution caused by fly ash burial To a heat-sensitive coating composition containing senospheres.

Generally, in various buildings, insulation is used to keep the temperature of the room constant regardless of the external temperature. However, it is disadvantageous that the efficiency of energy utilization in heating and cooling is greatly reduced because the heat loss due to the temperature difference between the inside and outside of the building can not be prevented only by the use of the insulation.

In order to overcome these disadvantages, heat paints are often used as finish paints for inner and outer walls of buildings. The heat paint is a high reflectance for the light of the near infrared ray region (750 ~ 2,500nm) which is the main cause of the temperature increase, and prevents the increase of the surface temperature. It interrupts the heat conduction to the inside of the coating film, It can reduce the unnecessary energy consumption due to the cooling as well as securing a comfortable living environment.

Hollow spheres are generally used for the purpose of obstructing the heat conduction to the inside of the coating film. In this connection, Korean Patent No. 500,601 discloses an insulating paint containing senosphere as a ceramic hollow body.

The Senosphere is a spherical silica-alumina compound produced during the combustion process that collects and processes the substances floating on the surface among the fly ash generated after the coal combustion in the coal-fired power plant. It is a lightweight particle filled with gas. These senospheres have the advantage of being economical because they are recycled industrial wastes and are economical.

However, the insulating coatings which are simply mixed with senospheres have limitations in performance improvement due to nonuniformity and poor durability after painting.

In order to overcome these limitations, the present inventors have conducted research for many years to improve the non-uniformity and poor durability after painting and to obtain sufficient heat insulation while utilizing Senosphere, and as a result, It was found that the effect was remarkably improved, and the present invention was completed.

Accordingly, an object of the present invention is to provide a heat-shielding coating composition containing Senosphere, which can improve uniformity and poor durability generated after painting, while ensuring sufficient heat insulation while utilizing Senosphere.

In order to solve the above problems,

5 to 30 parts by weight of senospheres, 10 to 30 parts by weight of pearlite, 40 to 70 parts by weight of titanium dioxide, 2 to 20 parts by weight of diatomaceous earth, 30 to 80 parts by weight of a solvent of 30 to 80 parts by weight per 100 parts by weight of acrylic emulsion having a solid content of 20 to 70% And 5 to 20 parts by weight of a solution prepared by dissolving a natural polysaccharide in propylene glycol to have a solid content of 40 to 70% by weight.

It is preferable that the senosphere has a particle size of 40 to 200 μm and a specific gravity of 0.4 to 0.8.

Preferably, the pearlite is expanded pearlite obtained by processing the perlite by heating at 1,000 to 1,300 DEG C into a fine powder.

The natural polymer polysaccharide may be represented by the following general formula (1).

The heat shielding coating composition may further comprise 1 to 20 parts by weight of at least one inorganic filler selected from aluminum hydroxide, silicon dioxide and mica.

The heat paints composition according to the present invention comprises senosphere, pearlite and a natural polymer polysaccharide having a predetermined structure, thereby improving non-uniformity and poor durability generated after painting and securing sufficient heat insulation have.

1 is a photograph showing an experimental apparatus for a thermal shutdown test.

Hereinafter, the thermal coating composition according to the present invention will be described in detail.

The heat shielding coating composition according to the present invention comprises 5 to 30 parts by weight of senospheres, 10 to 30 parts by weight of pearlite, 40 to 70 parts by weight of titanium dioxide, 2 to 30 parts by weight of diatomaceous earth with respect to 100 parts by weight of acrylic emulsion having a solid content of 20 to 70% 30 to 80 parts by weight of a solvent, and 5 to 20 parts by weight of a solution prepared by dissolving natural polysaccharides represented by the following formula (1) in propylene glycol so that the solid content is 40 to 70% by weight.

The acrylic emulsion may be any of those generally used in the art.

If necessary, the acrylic emulsion may be prepared by copolymerizing styrene with an acrylic monomer by emulsion polymerization. For example, as the acrylic monomer, a flexible monomer having a low Tg such as butyl acrylate, 2-ethylhexyl acrylate, ethyl acrylate and the like can be used. The solid content in polymerization is 20 to 70% by weight, .

A commercially available Mesiden RY-102 (China) can be used as the styrene acrylic emulsion prepared by emulsion-polymerizing styrene with an acrylic monomer.

Senospheres are included to provide differential thermal performance.

The Senosphere is a material contained in a fly ash collected in a dust collector in a coal fly ash. More than 75% to 80% of fly ash is fly ash, and about 1 to 2% of them are Senosphere. The Cenosphere is a relatively light, light, fine spherical body of fly ash filled with carbon dioxide or nitrogen. In the present invention, in order to ensure sufficient heat-shielding properties and adiabatic properties, the senospheres have a particle size of 40 to 200 μm and a specific gravity of 0.4 to 0.8.

When such a content is added in an amount of less than 5 parts by weight based on 100 parts by weight of the acrylic emulsion, an excellent heat shielding property can not be secured. When the amount is more than 30 parts by weight, There is a drawback that an improved heat-shielding effect can not be obtained. Therefore, the senescospher is preferably added in an amount of 5 to 30 parts by weight based on 100 parts by weight of the acrylic emulsion.

The pearlite is added in order to further improve the heat resistance performance by the interaction with the senosphere and to improve the abrasion resistance. Preferably, the pearlite is expanded pearlite obtained by processing perlite formed by volcanic action by heating at 1,000 to 1,300 DEG C and finely pulverizing the pearlite.

When the pearlite is added in an amount of less than 10 parts by weight based on 100 parts by weight of the acrylic emulsion, there is a disadvantage in that a sufficient heat-increasing effect can not be obtained due to the interaction with the senosphere. When the pearlite is more than 30 parts by weight, And it is disadvantageous in that it is difficult to increase the production cost of the heat shield paint and to disperse it in the mixing process. Therefore, the pearlite is preferably added in an amount of 10 to 30 parts by weight based on 100 parts by weight of the acrylic emulsion.

The titanium dioxide (R TiO2) serves as a pigment, enhances the solar reflection function and the resistance of the coating film against ultraviolet rays, and is harmless to the human body to ensure environment friendliness. In addition, it improves the chemical resistance, Concealability.

For example, when the heat-conductive paint according to the present invention is to be used as white, it is possible to produce a white paint having sufficient hiding power by titanium dioxide without using any additional pigment.

According to the present invention, the titanium dioxide is added in an amount of 40 to 70 parts by weight based on 100 parts by weight of the acrylic emulsion. When the content of titanium dioxide is less than 40 parts by weight based on 100 parts by weight of the acrylic emulsion, a sufficient hiding power can not be secured in the paint prepared. When the amount of titanium dioxide is more than 70 parts by weight, And therefore it is preferable to add them within the above range.

The diatomaceous earth is added for the purpose of improving heat insulation and strength of the coating material. Generally, diatomaceous earth is composed mostly of amorphous silica and has low density, high absorption chemical stability, low thermal conductivity and impact resistance, which contributes to improvement of insulation and strength of paint.

The diatomaceous earth is preferably added in an amount of 2 to 20 parts by weight based on 100 parts by weight of the acrylic emulsion. When the amount of the diatomaceous earth to be added is less than 2 parts by weight, there is a disadvantage in not contributing to sufficient strength improvement. When the amount of the diatomaceous earth is more than 20 parts by weight, no further improved strength effect can be obtained. .

The solvent may be added in an amount of 30 to 80 parts by weight based on 100 parts by weight of the acrylic emulsion. However, the above-mentioned solvent can be added or subtracted in consideration of workability at the time of mixing and workability at the time of coating, and the scope of the present invention does not necessarily limit the scope of the present invention. The solvent may be water, and a small amount of an organic solvent may be used if necessary. The solvent is preferably added within the above range in consideration of the workability at the time of mixing, and the manufactured heat-shrinkable coating material may be diluted by further adding a solvent according to need in the field.

The heat paints according to the present invention include 5 to 20 parts by weight of a solution prepared by dissolving a natural polysaccharide represented by the following formula 1 in propylene glycol to have a solid content of 40 to 70% by weight, based on 100 parts by weight of the acrylic emulsion .

≪ Formula 1 >

The natural polysaccharide represented by the above formula (1) is added in order to secure a sufficient film thickness when coating a paint and to give an elastic force. The natural polymer polysaccharide represented by the above formula (1) ensures a sufficient film thickness through controlling the viscosity of the composition to help the senescosphere to be positioned within the coating film, thereby solving the unevenness of the coating film surface generated after painting. Further, the durability of the senosphere is improved by the secured elastic force. In addition, the thickness after coating is secured enough to complement the heat effect.

 The natural polysaccharide represented by Formula 1 is dissolved in propylene glycol to have a solid content of 40 to 70% by weight. If necessary, the propylene glycol may be replaced with another solvent. The natural polymer polysaccharide represented by the above formula (1) can be used without any limitation, and commercially available xanthan gum can be used in the market.

The natural polysaccharide represented by the above formula (1) dissolved in the florolene glycol is added in an amount of 5 to 20 parts by weight based on 100 parts by weight of the acrylic emulsion. When the amount of the natural polysaccharide is less than 5 parts by weight, When the addition amount exceeds 20 parts by weight, workability is deteriorated due to high viscosity. Therefore, the addition is preferably carried out within the above range.

The heat shielding coating composition may further comprise 1 to 20 parts by weight of at least one inorganic filler selected from aluminum hydroxide, silicon dioxide and mica.

In the case of mica, since the shape is filled in the film in the form of a plate, it has excellent heat shielding effect and dimensional stability, and it improves smoothness during painting and gives a beautiful appearance after drying. Aluminum hydroxide is added to impart a role to prevent the paint from discoloring when exposed to ultraviolet light. Silicon dioxide is added to increase water resistance.

At least one inorganic filler selected from the group consisting of aluminum hydroxide, silicon dioxide and mica may not be sufficiently effective when it is out of the range of 1 to 20 parts by weight based on 100 parts by weight of the acrylic emulsion.

The heat shielding coating composition may further comprise a colored pigment. As the colored pigment, those generally used in the art can be used without limitation, and the present invention is not limited thereto. The colored pigments may be added within a range usually used in the field of colored paints or colored paints.

According to the present invention, the coating composition may contain additives commonly used in the art. For example, the additive may be at least one selected from the group consisting of antifoaming agents, dispersants, preservatives and thickeners.

The additive may be used within the range usually used in the art.

Hereinafter, a preferred embodiment will be described in order to facilitate understanding of the present invention. However, the following examples are given to aid understanding of the present invention, but the present invention is not limited thereto.

≪ Example 1 >

60 g of titanium dioxide, 5 g of diatomaceous earth, 5 g of silicon dioxide, 5 g of aluminum hydroxide and 60 g of water were added to 100 g of a styrene acrylic emulsion (Mesiden RY-102) having a solid content of 48 +/- 1 wt% A mixture of Senosphere, pearlite and xanthan gum having a specific gravity of 0.4 to 0.8 in a weight ratio of 1: 1 in propylene glycol was added to each of the solutions as shown in Table 1, .

<Experimental Example 1>

* Thermal shutdown test

As shown in FIG. 1, a box having a size of 500 mm × 500 mm × 500 mm and a thickness of 25 mm was manufactured. Separately, the heat-shading paint prepared in Example 1 was applied with a brush and dried on an acrylic plate of 500 × 500 × 1 mm. After 3 hours, it was repainted and dried for 72 hours.

The acrylic plate coated with the dried heat paints was placed on the holder 130, and the temperature was measured by the temperature meter 110. Then, the halogen lamp (12V, 100W) 120 was turned on with the side closed, and the internal temperature was measured by the temperature meter 110 after 1000 seconds. The results are shown in Table 1 below.

Table 1 below shows that the smaller the difference in temperature before and after the experiment, the better the heat shielding characteristics.

Example 1 Senosphere Xanthan gum Pearlite Temperature (℃) Before experiment After the experiment Temperature difference 10 10 0 25.1 30.9 5.8 10 25.0 30.5 5.5 20 24.9 30.0 5.1 30 25.0 29.7 4.7 40 25.1 29.8 4.7

As shown in Table 1, it can be seen that the temperature difference tends to decrease as the content of pearlite increases. However, when the content of pearlite is more than 30 wt.%, It can be understood that no further enhanced heat shielding effect is obtained.

&Lt; Example 2 >

Heat-sensitive paints were prepared in the same manner as in Example 1 except that the amounts of Senospheres, xanthan gum and pearlite added were changed as shown in Table 2 below.

<Experimental Example 2>

The results are shown in Table 2 below. [Table 2] &lt; tb &gt; &lt; TABLE &gt;

Example 2 Senosphere Xanthan gum Pearlite Temperature (℃) Before experiment After the experiment Temperature difference 10 20 0 25.1 30.8 5.7 10 25.0 30.4 5.4 20 25.1 30.1 5.0 30 25.0 29.5 4.5 40 24.9 29.4 4.5

In Examples 1 and 2, the content of xanthan gum increased from 10 g to 20 g. Comparing the results of Table 1 and Table 2, it can be seen that the heat shielding property is slightly improved.

&Lt; Example 3 >

Heat-sensitive paints were prepared in the same manner as in Example 1, except that the amounts of Senospheres, xanthan gum and pearlite added were changed as shown in Table 3 below.

<Experimental Example 2>

The results are shown in Table 3 below. [Table 3] &lt; tb &gt; &lt; TABLE &gt;

Example 3 Senosphere Xanthan gum Pearlite Temperature (℃) Before experiment After the experiment Temperature difference 20 10 0 25.2 30.5 5.3 10 25.1 30.2 5.1 20 25.1 29.9 4.8 30 25.1 29.4 4.3 40 25.0 29.4 4.4

In Examples 1 and 3, the content of senospheres increased from 10 g to 20 g, and when the results of Table 1 and Table 3 were compared, it was found that the heat shielding properties were significantly improved as the content of senospheres increased Show.

In particular, it can be seen that the most excellent effect can be obtained when the ratio of senosphere, dipsite and perlite is 2: 1: 3.

As described above, it can be seen that the heat shielding coating composition according to the present invention exhibits excellent heat shielding properties. Therefore, the heat shield coating composition according to the present invention can be usefully used as heat shield paints for various buildings.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

110: Temperature measuring instrument
120: Halogen lamp
130: Cradle

Claims (6)

5 to 30 parts by weight of senospheres, 10 to 30 parts by weight of pearlite, 40 to 70 parts by weight of titanium dioxide, 2 to 20 parts by weight of diatomaceous earth, 30 to 80 parts by weight of a solvent of 30 to 80 parts by weight per 100 parts by weight of acrylic emulsion having a solid content of 20 to 70% And 5 to 20 parts by weight of a solution obtained by dissolving a natural polysaccharide in propylene glycol to have a solid content of 40 to 70% by weight. The method according to claim 1,
Wherein the Senosphere has a particle size of 40 to 200 占 퐉 and a specific gravity of 0.4 to 0.8. The method according to claim 1,
Wherein the pearlite is an expanded pearlite obtained by processing perlite by heating to 1,000 to 1,300 DEG C to a fine powder. 4. The method according to any one of claims 1 to 3,
Wherein the natural polymer polysaccharide is represented by the following general formula (1)
&Lt; Formula 1 >

The method according to claim 1,
Wherein the heat shielding coating composition further comprises 1 to 20 parts by weight of at least one inorganic filler selected from aluminum hydroxide, silicon dioxide and mica. 5 to 30 parts by weight of senospheres having a particle size of 40 to 200 占 퐉 and a specific gravity of 0.4 to 0.8 based on 100 parts by weight of an acrylic emulsion having a solid content of 20 to 70% by weight, 10 to 30 parts by weight of expanded pearlite processed to powder, 40 to 70 parts by weight of titanium dioxide, 2 to 20 parts by weight of diatomaceous earth, 30 to 80 parts by weight of a solvent, natural polymer polysaccharide expressed by the following formula 1 in propylene glycol From 5 to 20 parts by weight of a solution which has a solids content of from 40 to 70% by weight, and from 1 to 20 parts by weight of at least one inorganic filler selected from aluminum hydroxide, silicon dioxide and mica. Thermal paint composition.
&Lt; Formula 1 >

Images