KR102185826B1 - Heat-insulating paint composition and heat-insulating method using the same - Google Patents

Abstract

The present invention relates to a thermal insulation paint composition, based on 100 parts by weight of hollow sphere-shaped ceramic powder with the degree of vacuum inside a sphere of 100 to 300 torr, comprising: 150 to 200 parts by weight of a water-soluble polymer resin; 20 to 30 parts by weight of a flame retardant; 5 to 10 parts by weight of a heat shielding agent; 5 to 10 parts by weight of a humidity control agent; 10 to 20 parts by weight of a water resistance enhancer; and 30 to 50 parts by weight of silica sol. The thermal insulation paint composition is not easily damaged by external impact or vibration of a building structure applied with the thermal insulation paint composition due to excellent thermal insulation performance and excellent adhesion and durability, and can exhibit long-term thermal insulation performance.

Description

Heat-insulating paint composition and heat-insulating method using the same}

The present invention relates to a heat insulating coating composition comprising a hollow sphere-shaped ceramic powder and a heat insulating construction method using the same.

In general, building structures are built by applying various insulation materials to maintain a constant indoor temperature without being affected by external temperature or weather conditions.

The higher the insulation effect by the insulation material, the less influenced by the external temperature. Therefore, the energy saving effect of the use and maintenance of artificial cooling and heating facilities such as air conditioners and heaters is enhanced. It is being built with care.

Insulation materials are largely divided into insulation panels and insulation paints.Insulation panels are mainly manufactured by molding or filling methods, which have the advantage of easy insulation work and less work time, whereas materials such as asbestos and glass wool are used. In this case, there is a problem that is harmful to the human body, and when a material such as styrofoam or urethane foam is used, there is a large problem of loss of internal space due to the thickness of the panel itself. In addition, there have been various problems, such as a decrease in heat insulation effect and durability due to moisture absorption of the insulation material itself, a concern about the occurrence of corrosion in a heat insulation facility, and problems in transportation and storage.

In the case of insulation paint, since it is painted on the wall of the building in the form of a thin film, it is easy to construct and has an advantage in using the internal space. Due to this advantage, it is adopted and used as an insulation material in the construction process of building structures, but has already been built. There is a more advantageous advantage when additionally insulating construction is performed on a building that is being used after being lost.

However, unlike the insulation panel, the insulation paint is difficult to install thick, and unlike styrofoam or urethane foam, there is a problem in that the insulation effect is lower than that of the insulation panel because the thermal conductivity is relatively higher because there are no separate pores inside.

In addition, condensation occurs due to a temperature difference between the inside and outside of the building due to the insulation paint, causing inconvenience in life and damage to wallpaper, and there is a concern that mold may occur. In addition, due to the occurrence of condensation and mold, durability and adhesion of the heat insulating coating film itself are deteriorated, and thus the function as a heat insulating material is deteriorated.

Accordingly, there is a need to develop a thermal insulation paint that can prevent condensation while having excellent thermal insulation properties, and can maintain physical properties such as durability and adhesion for a long time.

Registered Patent No. 10-1630400 (registered on 2016.06.08)

The heat insulation paint according to the present invention has various particle sizes, and preferably uses hollow sphere-shaped ceramic powder with a vacuum degree of about 100 to 300 torr inside the sphere, and includes various additives such as flame retardants, heat shields, and humidity control agents. , To improve the insulation performance.

Such a porous ceramic structure can exhibit a high thermal insulation effect with a thin thickness by preventing radiation, conduction, and convection by completely blocking the three mechanisms of heat transfer (radiation, conduction, and convection).

In addition, it is possible to control the humidity, prevent heat island phenomenon or condensation phenomenon, as well as excellent adhesion to the surface to be adhered and durability of the coating film to provide a thermal insulation coating composition having a long life and a thermal insulation construction method using the same.

In the insulation of existing buildings, as a plate-shaped insulation material is used, the insulation effect of the joint where the insulation material meets is insufficient, and a heat bridge phenomenon may occur, so that the inner surface may be formed below the dew point temperature. In these existing products for reinforcing insulation, there is a problem in that airtightness cannot be maintained due to the gap between the wall and the insulation material according to the difference in the thermal expansion melody of the insulation material and the adhesive material according to the temperature change at the bonding site between the wall and the plate-shaped insulation material. There is.

For this reason, condensation may occur on the inner edge of the wall, at the bonding site of the insulation, and on the surface of the wall inside the insulation, and a mold habitat environment may be provided due to condensation.This problem is a common phenomenon in existing building insulation. to be.

Accordingly, the present invention is applied like a paint to solve such insufficient insulation with a thin coating film, and an airtight surface insulation to provide a comfortable and healthy living environment as a material capable of covering the inner surface of a wall exposed to the dew point.

The thermal insulation properties of the combined thermal insulation coating composition are properties such as the cavity radiation of the black body model. For example, the characteristic of radiating absorbed heat to the outside is limited by temperature and wavelength, and may be differentiated from conventional insulation materials. Due to these technical features, the phenomenon of boiling water appears only when the surface temperature measured by the thermal imaging camera reaches 170°C on the surface of the coating film, and the present invention intends to effectively implement limited release of the absorbed heat energy.

An embodiment of the present invention for achieving the above-described object is, based on 100 parts by weight of hollow spherical ceramic powder having a vacuum degree of 100 to 300 torr inside the sphere, 150 to 200 parts by weight of a water-soluble polymer resin, 20 to 30 parts by weight of a flame retardant It relates to a heat insulating coating composition comprising 5 to 10 parts by weight of a heat shield, 5 to 10 parts by weight of a humidifier, 10 to 20 parts by weight of a water resistance enhancer, and 30 to 50 parts by weight of a silica sol.

The hollow sphere-shaped ceramic powder with a vacuum degree of 100 to 300 torr inside the sphere may be made of at least one or more silicate components selected from the group consisting of soda lime silicate, borosilicate, and aluminum silicate.

The hollow sphere-shaped ceramic powder with a vacuum degree of 100 to 300 torr inside the sphere, the first hollow sphere ceramic powder with a particle size of 70 to 120 μm, the second hollow sphere ceramic powder with a particle size of 50 to 70 μm, and a particle size of 30 to 50 It may be a mixture of a third hollow sphere ceramic powder having a µm and a fourth hollow sphere ceramic powder having a particle size of 20 to 30 µm.

In this case, the first hollow sphere ceramic powder, the second hollow sphere ceramic powder, the third hollow sphere ceramic powder and the fourth hollow sphere ceramic powder are mixed in a weight ratio of 2: 0.8 to 1.7: 0.8 to 1.5: 0.1 to 0.8 It can be a mixture.

The heat shielding agent may be zinc oxide, titanium dioxide, or a mixture thereof.

Another embodiment of the present invention, based on 100 parts by weight of hollow spherical ceramic powder having a vacuum degree of 100 to 300 torr inside the sphere, 150 to 200 parts by weight of water-soluble polymer resin, 20 to 30 parts by weight of flame retardant, 5 to 10 parts by weight of heat shielding agent Part, 5 to 10 parts by weight of a humidity control agent, 10 to 20 parts by weight of a water-resistance enhancer, 30 to 50 parts by weight of silica sol, and an insulating coating composition containing water are applied to the surface of the object and dried to form an insulating coating. It's about how.

The insulating coating may be formed of 1 to 4 layers.

The heat insulating coating composition of the present invention uses a hollow sphere-shaped ceramic powder, includes various additives such as a flame retardant, a heat shield, and a humidity control agent, has excellent thermal insulation performance, can control humidity, and can prevent heat island phenomenon or condensation. In addition, it has excellent adhesion to the adherend.

In addition, there is an advantage of forming an insulating coating having a long life by improving the durability of the coating film by using a hollow sphere-shaped ceramic powder having a vacuum degree of 100 to 300 torr inside a sphere having various particle sizes.

In addition, since water is used as a solvent for the heat insulating coating composition, there is no generation of volatile organic compounds (VOC) accompanying the use of organic solvents, so it is environmentally friendly and safe for the human body.

Before describing in detail through preferred embodiments of the present invention, terms or words used in the present specification and claims should not be construed as being limited to a conventional or dictionary meaning, but a meaning consistent with the technical idea of the present invention. And should be interpreted as a concept.

Throughout this specification, when a certain part "includes" a certain component, it means that other components may be further included rather than excluding other components unless otherwise stated.

Hereinafter, an embodiment of the present invention will be described. However, the scope of the present invention is not limited to the following preferred embodiments, and those skilled in the art can implement various modified forms of the contents described in the present specification within the scope of the present invention.

The present invention relates to a heat insulating coating composition comprising a hollow sphere-shaped ceramic powder having a vacuum degree of 100 to 300 torr inside the sphere and a heat insulating construction method using the same.

First, the heat insulating coating composition according to an embodiment of the present invention, based on 100 parts by weight of hollow spherical ceramic powder having a vacuum degree of 100 to 300 torr inside the sphere, 150 to 200 parts by weight of a water-soluble polymer resin, 20 to 30 parts by weight of a flame retardant , 5 to 10 parts by weight of a heat shield, 5 to 10 parts by weight of a humidifier, 10 to 20 parts by weight of a water resistance enhancer, and 30 to 50 parts by weight of a silica sol.

The hollow sphere-shaped ceramic powder with a vacuum degree of 100 to 300 torr inside the sphere is a spherical particle having a hollow inside, and is used to impart an insulating function by lowering the thermal conductivity of the insulating coating due to low thermal conductivity in the hollow.

As the ceramic powder, silicate materials such as soda lime silicate, borosilicate, aluminum silicate, etc. may be used. In addition, borosilicate, which has good workability and is easy to manufacture in a hollow sphere shape, can be used.

When the particle size of the hollow sphere ceramic powder, which is a particulate matter, has a constant particle size, the ratio of the space between the particles to the area occupied by the particles is high, so the heat insulation effect due to the hollow sphere ceramic powder is insignificant, as well as between the particles in the process of applying and drying the paint. A cavity is formed in the film to reduce adhesion and durability of the coating film after drying, or the solvent evaporates during drying and the volume of the binder decreases, resulting in a problem of lowering the adhesion between particulate matter.

In the present invention, by adjusting the particle size of the hollow sphere-shaped ceramic powder with a vacuum degree of 100 to 300 torr inside the sphere, relatively small particles are placed in the empty space between the particles, and each particle is firmly supported and bonded by a binder to insulate. The effect and durability of the coating film after drying can be improved.

Specifically, the hollow sphere-shaped ceramic powder having a vacuum degree of 100 to 300 torr inside the sphere may be a mixture of particles having different particle sizes, preferably a first hollow sphere-shaped ceramic powder having a particle size of 70 to 120 μm, It may be a mixture in which the second hollow spherical ceramic powder having a particle size of 50 to 70 μm, the third hollow spherical ceramic powder having a particle size of 30 to 50 μm, and the fourth hollow spherical ceramic powder having a particle size of 20 to 30 μm are mixed.

If the maximum particle size of the hollow sphere-shaped ceramic powder with a vacuum degree of 100 to 300 torr in the sphere exceeds 120 μm, the particle size becomes excessively large, causing irregularities on the surface of the dried coating film or the problem of particle separation. In addition, when the minimum particle size is less than 20 μm, the particle size is excessively small, and a scattering problem may occur after drying. Therefore, it is preferable to use hollow spherical ceramic powders having the aforementioned particle size together.

In particular, the first hollow sphere ceramic powder, the second hollow sphere ceramic powder, the third hollow sphere ceramic powder and the fourth hollow sphere ceramic powder are mixed in a weight ratio of 2: 0.8 to 1.7: 0.8 to 1.5: 0.1 to 0.8. It is desirable to be. This weight ratio is CPVC (Critical Pigment Volume Concentration), or close to it, and small particles are located in the space between large particles, so that the supporting force to support each other is maximally strong, thereby increasing the durability of the coating film. In a weight ratio capable of enhancing the heat insulation performance by the hollow sphere ceramic powder, each hollow sphere ceramic powder is preferably mixed and used in the above weight ratio.

The water-soluble polymer resin is added to combine components included in the heat insulating coating composition as a binder, and to form a coating film by bonding the heat insulating coating composition to the surface to be processed.

If the water-soluble polymer resin is contained in an amount of less than 100 parts by weight with a vacuum degree of 100 to 300 torr inside the sphere, sufficient bonding strength and adhesion are not formed, so that particulate matter is desorbed, and the adhesion and durability of the coating film after drying are deteriorated. And, in the case of exceeding 200 parts by weight, since there is a problem that the insulation performance and durability of the dry coating film are deteriorated due to the excessive content of the water-soluble polymer resin, it is preferably included within the above-described weight range.

As such a water-soluble polymer resin, a water-soluble polyvinyl alcohol resin, a water-soluble acrylic resin, a water-soluble epoxy resin, a water-soluble alkyd resin, etc. may be used, but it is preferably transparent to provide a desired color, and after drying, the water resistance, heat resistance, and It is preferable to use a water-soluble acrylic resin having excellent durability and low thermal conductivity by itself.

The water-soluble acrylic resin used at this time is preferably a high molecular weight acrylic resin having a weight average molecular weight of 50,000 to 100,000 g/mol.If the molecular weight is high, the transparency is more excellent, and scratch resistance, adhesion and impact strength are better. It is because it can improve and contribute to the durability improvement of a coating film. The water-soluble acrylic resin may be in the form of a powder having a particle size of 100 to 200 nm, and may be dispersed in a solvent such as water when used.

The flame retardant is added to impart flame retardant performance to the coating film, and may be included in an amount of 20 to 30 parts by weight based on 100 parts by weight of hollow spherical ceramic powder having a vacuum degree of 100 to 300 torr inside the sphere. It is possible to impart excellent flame retardant performance while preventing the deterioration of the physical properties of the coating film.

As the flame retardant, various flame retardants such as halogen-based flame retardants, phosphorus-based flame retardants, and inorganic flame retardants may be used, but it is preferable to use a phosphorus-based flame retardant having excellent flame retardant effect and not toxic to the environment and human body.

In particular, it is preferable to use a phosphorus-based flame retardant containing nitrogen, which has excellent heat resistance and induces the formation of charcoal in the event of a fire by generating a high molecular polyphosphoric acid that acts as a dehydrogenation catalyst by promoting thermal condensation polymerization of polyphosphoric acid. For example, melamine phosphate Or ammonium polyphosphate may be used.

The heat shielding agent is added to the building structure to minimize the cooling load inside the building structure by reflecting it without absorbing the external solar radiation, to improve the heating efficiency, and to prevent the heat island phenomenon in the city. The vacuum degree of 100 to 300 torr may be included in 5 to 10 parts by weight based on 100 parts by weight of the hollow spherical ceramic powder, and when included in this weight range, the most excellent heat shielding effect appears, and at the same time, it is possible to prevent the deterioration of durability of the dry coating film.

Zinc oxide, titanium dioxide, or a mixture thereof may be used as the heat shielding agent. When a mixture is used, zinc oxide and titanium dioxide are most preferably mixed in a ratio of 1:0.8 to 1.7 by weight.

The particle size of the heat shielding agent may be 100 to 200 nm, and as the particle size is formed in a nano scale, it is uniformly dispersed in the heat insulating coating composition including micro-scale hollow sphere ceramic powder, thereby providing a constant heat shielding effect over the entire area. Can be expressed. In addition, when the particle size of the heat shielding agent is out of the above range, uniform dispersion becomes difficult or the particle size is excessively small, so that the heat shielding effect becomes insignificant. Therefore, it is preferable to use the heat shielding agent having the above-described particle size.

The humectant is added to control the humidity of the building structure on which the insulating coating is applied, and to prevent condensation due to the temperature difference between the inside and the outside.Porous ceramic powder such as zeolite may be used as a humidifier, and a hollow sphere ceramic It may be included in 5 to 10 parts by weight based on 100 parts by weight of the powder.

The water resistance enhancer is added to increase the water resistance of the insulating coating film and prevent the problem of lowering the durability or adhesion of the coating film due to moisture, and inorganic powders such as kaolin, talc, clay, bentonite, and calcium carbonate may be used as the water resistance enhancer. And is not limited thereto.

The water resistance enhancer may be included in an amount of 10 to 20 parts by weight based on 100 parts by weight of the hollow spherical ceramic powder, and if it is contained in less than 10 parts by weight, the effect of improving water resistance is insignificant, and if it is contained in more than 20 parts by weight, the hollow spherical ceramic powder Since the critical pigment volume concentration of may be excessively exceeded to reduce the heat insulation performance and durability of the coating film, it is preferably included within the above-described weight range.

The silica sol is added to increase the strength of the coating film to prevent damage to the coating film due to external impact or vibration of the building structure, and may be included in an amount of 30 to 50 parts by weight based on 100 parts by weight of the hollow sphere ceramic powder, and within this weight range. When used in the film, the effect of enhancing the strength of the coating film is maximized, and problems of lowering physical properties such as lowering insulation performance, lowering durability, and lowering adhesion do not occur.

The silica sol used at this time may be one in which silica powder having a particle size of 30 to 100 nm is dispersed in water at a concentration of 30 to 40% by weight. At this time, in order to maintain a sol state by dispersing the silica powder and prevent it from changing to a gel phase, water in which the silica powder is dispersed may contain a Group 1A alkali metal hydroxide such as sodium hydroxide.

The heat insulating coating composition according to an embodiment of the present invention may further include a physical property improving agent for improving adhesion and strength to the adhered surface of the dried coating film, and the physical property improving agent has a vacuum degree of 100 to 300 torr inside the sphere. With respect to 100 parts by weight of the hollow spherical ceramic powder, it may be further included in an amount of 1 to 4 parts by weight, and when the content of the property improver is less than 1 part by weight, the effect of improving the properties by the property improver is insignificant, and when it exceeds 4 parts by weight In addition, since the effect of improving the strength of the coating film according to the amount added is insignificant, but also the elasticity is lowered, there is a problem in that the coating film is damaged according to the behavior of the adherend, so it is preferably included within the above-described weight range.

As the physical property improving agent, a mixture in which 2-sulfobenzoic acid cyclic anhydride and disodium octaborate or a hydrate thereof are mixed in a ratio of 1: 2 to 3 may be used, and when the weight ratio is out of the above weight ratio, the effect of improving physical properties is insignificant or A problem of poor physical properties may occur.

Insulation coating composition according to an embodiment of the present invention may include additives commonly used in the manufacture of paints and water as a solvent, and as additives, dispersants, defoaming agents, plasticizers, drying agents, etc. may be used, and tap water as a solvent , Distilled water, purified water, fresh water, etc. may be used.

Another embodiment of the present invention relates to an insulation construction method using the insulation coating composition according to an embodiment of the present invention as described above.

Specifically, first, based on 100 parts by weight of hollow spherical ceramic powder with a vacuum degree of 100 to 300 torr inside the sphere, 150 to 200 parts by weight of water-soluble polymer resin, 20 to 30 parts by weight of flame retardant, 5 to 10 parts by weight of heat shielding agent, humidity control To prepare an insulating coating composition containing 5 to 10 parts by weight, 10 to 20 parts by weight of a water resistance enhancer, 30 to 50 parts by weight of silica sol, and water as a solvent.

Next, the prepared heat-insulating coating composition is applied to the surface of the object to be heat-insulated using various methods such as rollers, brushes, sprays, etc., and dried for a predetermined time to form a heat-insulating coating film. At this time, the type of the object is not particularly limited, such as concrete, wood, steel.

Such an insulating coating is excellent in thermal insulation performance with only one coating, but coating 2-4 times improves the insulation performance and prevents cracking or peeling of the coating.Therefore, coating 2-4 times to create a multilayered insulation coating. It is desirable to form.

Hereinafter, specific actions and effects of the present invention will be described through an embodiment of the present invention. However, this is presented as a preferred example of the present invention, and the scope of the present invention is not limited according to the embodiment.

[ Manufacturing example ]

First, the hollow spherical borosilicate powder was divided into four groups with particle sizes ranging from 70 to 120 μm, 50 to 70 μm, 30 to 50 μm, and 20 to 30 μm, and then in order, each of 2: 1: 0.8: 0.5 It was prepared by mixing at a weight ratio.

Next, 100 parts by weight of the hollow spherical borosilicate powder mixture, a weight average molecular weight of about 80,000 g/mol, and 175 parts by weight of a water-soluble acrylic resin having a particle size of 100 to 200 nm, 22 parts by weight of ammonium polyphosphate as a flame retardant, heat shielding agent The heat insulating coating composition of Example 1 was prepared by mixing 8 parts by weight, 8 parts by weight of zeolite as a humidifying agent, 13 parts by weight of talc as a water resistance enhancer, 47 parts by weight of silica sol as a coating strengthening agent, and 150 parts by weight of fresh water as a solvent.

As the heat shielding agent, a mixture of a heat shielding agent in which zinc oxide and titanium dioxide having a particle size of 100 to 200 nm were mixed in a 1:1 ratio was used, and the silica sol as a coating film strengthening agent was 30% by weight of silica powder having a particle size of 30 to 100 nm. What was included in the concentration of was used.

[ Experimental example One]

An insulating coating composition was prepared using the same method as in Preparation Example, but the weight ratio of the hollow spherical borosilicate powder by particle size was changed as shown in Table 1.

(Part by weight) Particle size (㎛) 70~120 50~70 30-50 20~30 Example 1 2 One 0.8 0.5 Example 2 2 One One 0.5 Example 3 2 One 1.4 0.5 Comparative Example 1 2 One - 0.5 Comparative Example 2 2 One 0.6 0.5 Comparative Example 3 2 One 1.6 0.5 Comparative Example 4 - One One 0.5 Comparative Example 5 2 One One - Comparative Example 6 2 - - 0.5

Next, the tensile strength of each heat insulating coating composition was measured according to the following method, and the heat insulation, condensation and water resistance experiments were performed, and the results are shown in Table 2. The tensile strength was measured according to ASTM D1708-13 standard, The tensile strength calculated at the point of failure of the specimen was expressed as an average value of the measured values of at least five samples for each condition.

Insulation performance is to prepare a cube with a thickness of 5 mm and a side length of 30 cm, apply each insulation coating composition to the surface of each cube in a thickness of 2 mm, and place a cup of water at 100°C inside the cube for 30 minutes. After lapse, the temperature of the water was measured and confirmed. This experiment was carried out in a laboratory with a temperature of 18° C. and a relative humidity of 47%.

To prevent condensation, prepare a copper plate with a thickness of 0.5 mm, apply each insulation coating composition to each copper plate, form a film with a thickness of about 1 mm, dry it completely, and completely remove the gap by making the copper plate a cone shape. After filling water and ice to maintain the temperature of about 3±2℃, it was placed in a thermo-hygrostat with 22℃ and 90% relative humidity, and the initial condensation formation time and the amount of condensation after 2 hours were measured and judged.

Water resistance is excellent (○) when there is no change in the surface by dropping water at a height of 50 cm at a rate of two drops per second for 1 hour to 168 hours in the presence of a heat source of 60°C. When there was little change of, it was evaluated as good (Δ), and when there was a noticeable change in the surface, it was evaluated as defective (X).

Tensile strength (Mpa) Insulation performance (℃) First condensation formation time (minutes) Condensation amount (g) Water resistance Example 1 8.8 50 55 2.0 △ Example 2 9.2 55 60 1.5 ○ Example 3 8.7 52 60 1.6 ○ Comparative Example 1 3.6 33 35 5.1 △ Comparative Example 2 5.6 36 45 2.5 △ Comparative Example 3 6.2 34 50 2.8 △ Comparative Example 4 3.8 32 30 5.5 △ Comparative Example 5 3.5 34 30 6.0 △ Comparative Example 6 3.5 30 25 6.3 △

Looking at the experimental results in Table 2, in the case of Examples 1 to 3, as a result of the thermal insulation performance test, the temperature of the water inside the enclosed space in which the thermal insulation coating was formed was maintained at 50°C or higher, and it was determined that the thermal insulation performance was excellent. It took about 1 hour for condensation to form, and after 2 hours, the amount of condensation was found to be very small, 2.0 g or less, indicating that the condensation performance was excellent. On the other hand, in the case of Comparative Examples 1 to 6, the results of the thermal insulation performance test result of water As the temperature was maintained at about 30 to 36° C., it was confirmed that not only the thermal insulation performance was significantly lowered compared to the examples, but also the condensation performance was also lowered.

Therefore, from the above experimental results, in terms of improving the thermal insulation performance, condensation prevention performance, and water resistance of the heat insulating coating composition of the present invention, the particle size is 70 to 120 μm, 50 to 70 μm, 30 to 50 μm, respectively, It was confirmed that it is preferable to mix and use the hollow sphere type borosilicate powder in the range of 20 to 30 μm, and it can be confirmed that the mixing ratio thereof is more preferably in the range of 2: 0.8 to 1.7: 0.8 to 1.5: 0.1 to 0.8. there was.

[ Experimental example 2]

An insulating coating composition was prepared using the same method as in Preparation Example, but additionally, a physical property improving agent was added in an amount of 2.5 parts by weight based on 100 parts by weight of the hollow sphere type borosilicate powder. As a physical property improver, a mixture in which 2-sulfobenzoic acid cyclic anhydride (A) and disodium octaborate tetrahydrate (B) were mixed in the weight ratio shown in Table 3 was used.

Thereafter, the tensile strength, adhesive strength, surface quality, and the presence or absence of cracks of each heat insulating coating composition were evaluated, and the results are also described in Table 3.

Tensile strength was measured using the same method as in Experimental Example 1, and adhesive strength was measured according to the method of KS F 4919.

The surface quality was evaluated by observing with the naked eye whether unevenness did not occur on the surface of the dry coating film and was formed smoothly and smoothly. When there were few irregularities and formed smoothly, it evaluated as excellent (○), and when there were many irregularities, or when the coating film was not smooth, it evaluated as bad (X).

Cracks were evaluated according to the presence or absence of cracks and the number and size of cracks by visually observing the coating film. Excellent (○) when no cracks occur, good (△) when 3 or less fine cracks with a crack length of 1 cm or less, 1 or more cracks with a crack length exceeding 1 cm, or 4 or more fine cracks with a crack length of 1 cm or less If it was evaluated as being defective (X).

Weight ratio of A:B Tensile strength (Mpa) Adhesion strength (Mpa) Surface quality Crack prevention Example 1 - 8.8 1.9 ○ ○ Example 4 1:1 9.2 1.8 △ ○ Example 5 1:2 10.8 2.6 ○ ○ Example 6 1:3 11.0 2.7 ○ ○ Example 7 1:4 8.6 2.0 ○ △

Referring to the experimental results in Table 3, it can be seen that the tensile strength and adhesive strength of Examples 5 and 6 to which the physical property improving agent was added were significantly improved compared to Example 1 in which the physical property improving agent was not included. However, in the case of Examples 4 and 7 to which the physical property improving agent was added, it was confirmed that some physical properties or the quality of the surface were rather deteriorated, which was found to be 2-sulfobenzoic acid cyclic anhydride and disodium octaborate 4 used as property enhancing agents. It is confirmed that this is a problem that appeared because hydrates are not mixed in an appropriate ratio, so that the effect of improving physical properties is not obtained, but rather lowers the adhesion and strength of the coating film.

Therefore, in order to improve the physical properties of the heat insulating coating composition of the present invention, a mixture of 2-sulfobenzoic acid cyclic anhydride and disodium octaborate tetrahydrate is used as a physical property improver, but a mixture of 1: 2 to 3 weight ratio is used. It was confirmed that it is preferable to use.

The present invention is not limited to the specific embodiments and description described above, and any person with ordinary knowledge in the technical field to which the present invention pertains without departing from the gist of the present invention claimed in the claims can implement various modifications And, such modifications are within the scope of protection of the present invention.

Claims (7)

Based on 100 parts by weight of hollow sphere ceramic powder,
Including 150 to 200 parts by weight of a water-soluble polymer resin, 20 to 30 parts by weight of a flame retardant, 5 to 10 parts by weight of a heat shield, 5 to 10 parts by weight of a humidifier, 10 to 20 parts by weight of a water resistance enhancer, and 30 to 50 parts by weight of a silica sol,
The hollow spherical ceramic powder is a first hollow spherical ceramic powder having a particle size of 70 to 120 μm, a second hollow spherical ceramic powder having a particle size of 50 to 70 μm, and a third hollow spherical ceramic powder and particles having a particle size of 30 to 50 μm It is a mixture of 4th hollow spherical ceramic powder having a size of 20-30㎛,
The first hollow sphere ceramic powder, the second hollow sphere ceramic powder, the third hollow sphere ceramic powder and the fourth hollow sphere ceramic powder are mixed in a weight ratio of 2: 0.8 to 1.7: 0.8 to 1.5: 0.1 to 0.8 Insulation coating composition made into. The method of claim 1,
The hollow spherical ceramic powder, characterized in that consisting of at least one or more silicate components selected from the group consisting of soda lime silicate, borosilicate, and aluminum silicate. delete delete The method of claim 1,
The heat shielding agent is zinc oxide, titanium dioxide, or a mixture thereof, characterized in that the heat insulating coating composition. With respect to 100 parts by weight of hollow spherical ceramic powder, 150 to 200 parts by weight of a water-soluble polymer resin, 20 to 30 parts by weight of a flame retardant, 5 to 10 parts by weight of a heat shielding agent, 5 to 10 parts by weight of a humidity control agent, 10 to 20 parts by weight of a water resistance enhancer, and A coating step of applying an insulating coating composition comprising 30 to 50 parts by weight of silica sol and water to the surface of the object; And
Including; a coating film forming step of drying the applied heat insulating coating composition to form a heat insulating coating film,
The hollow spherical ceramic powder is a first hollow spherical ceramic powder having a particle size of 70 to 120 μm, a second hollow spherical ceramic powder having a particle size of 50 to 70 μm, and a third hollow spherical ceramic powder and particles having a particle size of 30 to 50 μm It is a mixture of 4th hollow spherical ceramic powder having a size of 20-30㎛,
The first hollow sphere ceramic powder, the second hollow sphere ceramic powder, the third hollow sphere ceramic powder and the fourth hollow sphere ceramic powder are mixed in a weight ratio of 2: 0.8 to 1.7: 0.8 to 1.5: 0.1 to 0.8 Insulation construction method to do. The method of claim 6,
The coating step and the coating film forming step are performed 1 to 4 times, and the resulting insulating coating is formed in 1 to 4 layers.