KR20150106806A - Heat-insulating paint composition having high heat-resisting property - Google Patents

Abstract

The present invention relates to a heat-insulation paint composition with high heat resistance and, more particularly, a heat-insulation paint composition with high heat resistance, which comprises: a porous ceramic filter which reduces thermal conductivity; a binder which provides cohesive force and adhesiveness; and a diluent which adjusts viscosity. Accordingly, the composition is proper to be used as a heat insulation material for industrial structures such as plants for petrochemistry and oil refining, boilers, and heat exchangers which are exposed to conditions at high temperatures.

Description

TECHNICAL FIELD [0001] The present invention relates to a heat-insulating paint composition having high heat-

More particularly, the present invention relates to a porous ceramic filler for reducing thermal conductivity, a binder for providing cohesive force and adhesion, and a diluent for controlling viscosity, Heat-insulating road compositions suitable for use as insulation materials for industrial structures exposed to high-temperature conditions such as plants, boilers, heat exchangers, and the like.

Generally petrochemical or refinery plants; A flange or heat exchanger of a boiler; A channel cover; Valves; Equipment such as covers and outer walls; Supports such as trunnion or shoe; An industrial structure exposed to a high temperature condition such as a piping such as a trap, a strainer or a manifold may be designed to prevent the temperature of the internal fluid from being lowered, In order to protect the insulation, non-inflammable insulation panel is used.

Insulating panels used for these purposes are mainly manufactured by molding or filling methods. They are harmful due to harmful components contained in asbestos or glass wool, encapsulated inside space due to their own thickness, insulated by moisture absorption of the insulation itself There are problems such as reduction of effect and durability, concern about occurrence of corrosion to a thermal insulation facility, problems of transportation and storage, and economic loss due to stopping operation of an industrial structure during insulation installation work.

Conventionally, domestic registered patent No. 10-1296880 (Aug. 08, 2013) includes 35-37% by weight of silicone acrylic resin, 19-20% by weight of titanium dioxide, 22-24% by weight of talc, 10-15% by weight of vacuum ceramic powder %, A porous titanium aerogel of 2-5 wt%, an antifoam agent of 0.05-0.1 wt%, a dispersant of 0.1-0.5 wt%, a preservative of 0.05-0.2 wt%, a thickener of 1-2 wt%, and the balance of water. Heat-resistant insulating coating compositions have been introduced.

The heat insulating coating composition is applied mainly to the inner wall or outer wall of a building to prevent the diffusion of fire temporarily in case of fire. However, when the heat insulating coating composition is continuously exposed to a high temperature of 100 캜 or more, And thus it is not suitable for use as an insulating coating for industrial structures exposed to a high temperature condition.

In addition, in the registered patent No. 10-1033189 (Apr. 28, 2011), the solid content is 40 to 70%, the weight average molecular weight is 10,000 to 200,000, the hydroxyl value is 20 to 200 mg KOH / g, the glass transition temperature (Tg) 20 to 300 parts by weight of a silicate-based inorganic material, 5 to 50 parts by weight of a melamine-based cured resin and 10 to 200 parts by weight of a solvent, based on 100 parts by weight of a polymer composite resin having a hydroxyl group by reacting an acrylic resin having 0 to 80 DEG C with colloidal silica By weight based on the total weight of the composition.

The fire-retardant coating composition is an incombustible paint mainly used for interior purposes in an apartment door, a ship interior wall, etc. It increases the ignition temperature after curing, but contains a large amount of organic solvent. Thus, there is a risk of fire upon application to a heat- There is a problem that it is not suitable for use as an insulation paint for industrial structures exposed to high temperature.

Registration No. 10-1296880 (August 08, 2013) Registration No. 10-1033189 (April 28, 2011)

Accordingly, an object to be solved by the present invention is to provide an industrial structure that can be installed or repaired in an operating temperature state without interruption, for example, in an industrial structure exposed to high temperature conditions such as petrochemical or refinery plant, boiler, heat exchanger, And which can be applied at room temperature and used at a high temperature, and which has not only incombustibility and heat insulation but also excellent corrosion resistance and water resistance.

The heat-resistant insulating coating composition according to the present invention comprises 10 to 50% by weight of a ceramic filler having a porous structure, 10 to 40% by weight of a nonflammable or highly heat-resistant binder, and 10 to 80% by weight of a diluent selected from distilled water or alcohol .

The ceramic filler is at least one selected from the group consisting of oxide ceramics, non-oxide ceramics, glass bubble, and volcanic material, and has a particle size of 10 to 1,000 μm and a fracture strength of 200 to 30,000 psi .

The binder is prepared by reacting aluminum isopropoxide with phosphoric acid in a molar ratio of 1: 1.5-4.0 to prepare a mixture of aluminum phosphate, silica (SiO ₂ ) and aluminum phosphate having a solid content of 10-60 wt% A basic liquid silicate having a solids content of 10 to 50% by weight, a cement, a silane hydrolyzate having a solid content of 5 to 60% by weight, an alkaline metal (M ₂ O) at a molar ratio of 1: And heat-resistant silicon having a heat resistance of 100 to 1,000 DEG C and a solid content of 10 to 100% by weight.

The heat-resistant insulating coating composition according to a preferred embodiment of the present invention may further comprise 7 to 16 wt% of soda lime borosilicate glass, 7 to 16 wt% of silica alumina glass, 7 to 8 wt% of volcanic ash, titanium dioxide 2 To 3% by weight; 18 to 35% by weight of aluminum phosphate which is prepared by reacting aluminum isopropoxide with phosphoric acid in a molar ratio of 1: 2.8 and has a solid content of 48% by weight; As a diluent, 30 to 50% by weight of distilled water; And a control unit.

The heat-resistant heat-insulating coating composition according to the present invention is applied to an industrial structure exposed to a high temperature to improve the heat insulation property of the conductor, and effectively protects the worker from heat generated in the industrial structure.

In addition, the high heat-resistant insulating coating composition according to the present invention can be applied even without stopping the operation of the industrial structure to be worked. Especially when part of the industrial structure is disassembled due to repair work or the like, It is possible to re-coat only the damaged portion. Therefore, it is possible to achieve a high maintenance efficiency. Especially, when a high heat-resistant binder such as silane hydrolyzate or heat-resistant silicone is used as the binder,

Further, the heat-resistant insulating coating composition according to the present invention can be easily applied to industrial structures having irregular shapes such as panel-type heat insulating panel panels, valves, pipe covers, traps and the like, It is possible to utilize the space efficiently, and the thermal efficiency can be increased by improving the heat insulating performance.

Hereinafter, the structure, operation and effect of the present invention will be described in detail. However, even if it is indispensable to carry out the present invention, a detailed description of what is well known in the art or which can be easily carried out by the ordinary artisan will be omitted.

The heat-resistant insulating coating composition according to the present invention comprises 10 to 50% by weight of a ceramic filler having a porous structure, 10 to 40% by weight of a nonflammable or heat-resistant binder, and 10 to 80% by weight of a diluent.

First, the ceramic filler having the porous structure is made of at least one selected from oxide ceramics, non-oxide ceramics, glass bubble or volcanic material, and has a particle size of 10 to 1,000 μm and a fracture strength of 200 to 30,000 psi.

The oxide ceramics include any one or more selected from SiO ₂ , Al ₂ O ₃ , Fe ₂ O ₃ , CaO, MgO, Na ₂ O, K ₂ O, TiO ₂ , ZnO, ZrO ₂ and P ₂ O ₅ Wherein the non-oxide ceramic includes at least one selected from the group consisting of carbides, nitrides, borides, and silicides, and the glass bubbles include at least one selected from the group consisting of soda lime-borosilicate glass and silica alumina glass . The volcanic ash is a fine glassy hollow body obtained by heat treating volcanic glass microparticles in volcanic ash deposits at a high temperature for a short time.

Also, the carbide of the non-oxide ceramic includes at least one selected from B ₄ C, SiC, TiC, ZrC, Mo ₂ C and WC, and the nitride includes BN, AlN, Si ₃ N ₄ , TiN, ZrN , And the boride is at least one selected from the group consisting of AlB ₂ , TiB ₂ , ZrB ₂ , And the suicide may include at least one selected from MoSi ₂ and WSi.

The ceramic filler has a function of reducing the thermal conductivity and improving the strength and appearance of the surface, and the content thereof is preferably 10 to 50% by weight. If the content of the porous ceramic filler is less than 10% by weight, the heat insulating coating composition according to the present invention can not have the desired heat insulating property and strength. On the contrary, when the content is more than 50% by weight, the content of the binder is decreased, .

Next, the binder is made of at least one selected from aluminum phosphate, basic liquid silicate, cement, silane hydrolyzate or heat-resistant silicone. Here, aluminum phosphate, basic liquid silicate and cement are incombustible binders, and silane hydrolyzate and heat-resistant silicon are high heat-resistant binders. The high heat-resistant binder is preferably used at a temperature of 450 DEG C or lower.

The aluminum phosphate is prepared by reacting aluminum isopropoxide with phosphoric acid in a molar ratio of 1: 1.5 to 4.0, and has a solid content of 10 to 60% by weight. The aluminum isopropoxide and phosphoric acid may be reacted together with water. The aluminum phosphate crystallizes at a high temperature and has an advantage of excellent adhesion, surface strength and water resistance. However, when the temperature is lower than 100 ° C, the crystallization rate is lowered. If the heat source is removed within 7 days after the application, Strength and water resistance may be lowered.

The basic liquid silicate is at least one selected from the group consisting of potassium silicate, sodium silicate, lithium silicate and aluminum silicate, and is composed of silica (SiO ₂ ) and alkali metal (M ₂ O) at a molar ratio of 1: 0.5 to 5.0, and a solid content of 10 to 50% by weight.

Since the liquid silicate is excellent in heat resistance and paintability, it is preferably used in an indoor structure having an exposure temperature of 800 ° C or less mainly because the water resistance is somewhat insufficient. When the operation is performed in a state where the operation temperature of the structure is 60 ° C or higher, There is an advantage that the interval is shortened.

Examples of the cement include a hard cement selected from lime, lauric lime, gypsum, and magnesia cement; Portland cement, hydraulic lime, natural cement, Roman cement; Mixed cement selected from blast furnace slag cement, fly ash cement, and Portland pozzolan cement; Special cement selected from white portland cement, thermal insulation cement, inflatable hydraulic cement, marshalli cement, aged steel cement, ultra rapid cement, silica cement, alumina cement, bag cement, oil well cement and tile cement; Or the like.

Since the cement has a high water resistance, it is preferably applied to a structure largely influenced by moisture, and is preferably mixed with the liquid silicate, the silane hydrolyzate and the high heat-resistant silicone. Since the cement reacts with the crystal water in the heat insulating layer to prevent the surface cracking and delamination due to the evaporation of the crystal water even when the coating thickness is thick once, there is an advantage in favor of the thickness formation, The hydration reaction causes additional curing to improve the strength and water resistance, but there is a problem that the heat insulating performance is slightly deteriorated.

And the silane hydrolyzate is obtained by hydrolyzing a mixture of the alkoxysilane monomer and the silicate or an alkoxysilane monomer or silicate represented by the formula R ' _n -Si- (OR) _{4- n} , wherein Si: H ₂ O In a molar ratio of 1: 0.1 to 50, and has a solid content of 5 to 60% by weight. In the above formula R ' _n -Si- (OR) _{4- n} , R' is a hydrocarbon compound having an alkyl group having 1 to 16 carbon atoms; Or silane coupling agents having vinyl, epoxy, styryl, methacryloxy, acryloxy, amino, chloropropyl, mercapto, sulfido, isocyanato groups; , R is a hydrocarbon compound having 1 to 6 carbon atoms, and n is 0 to 4.

The silane hydrolyzate is excellent in water resistance but insufficient in heat resistance. Therefore, it is preferable to apply the silane hydrolyzate to a structure having a temperature of 450 DEG C or less.

The heat-resistant silicon may be at least one selected from the group consisting of polysiloxane (Si-O), polysilane (Si-Si), polysilathiane (Si-S), polycarbosilane (Polysilazane, Si-N) and Polysilaphosphane (Si-P), and has a heat resistance of 100 to 1,000 ° C and a solid content of 10 to 100% by weight. The heat-resistant silicone is preferably applied to a structure having an excellent water resistance and water repellency but a low heat resistance and mainly having an exposure temperature of 450 캜 or less.

The binder has a function of providing a cohesive force to the ceramic filler having the porous structure and adhesion to the conductor, and the content thereof is preferably 10 to 40% by weight. If the content of the incombustible binder is less than 10% by weight, the cohesive force between the ceramic fillers decreases to lower the surface strength of the coating film and deteriorate the adhesion with the conductor. Conversely, if the content of the incombustible binder exceeds 40% by weight, Is lowered to deteriorate the heat insulating performance.

Finally, the diluent includes any one of distilled water and alcohol, and the kind of the diluent is selected according to the kind of the incombustible binder. That is, when the binder is aluminum phosphate, basic liquid silicate, heat-resistant silicone or cement, distilled water is preferably used as a diluent, and when the binder is a silane hydrolyzate, alcohol is preferably used as a diluent. Further, in the case of applying at room temperature, it is preferable to use alcohol as a diluent in order to shorten the curing time.

The diluent serves to control the viscosity of the heat-resistant insulating coating composition according to the present invention, and the content thereof is preferably 10 to 80% by weight. When the content of the diluent is less than 10% by weight, the viscosity is too high to be uniformly applied to the conductor. On the other hand, when the content exceeds 80% by weight, the resin flows after coating, There is a problem that the coating thickness per application is too thin.

The method of using the heat-resistant insulating coating composition according to the present invention is a method of sufficiently mixing the above three components, that is, a ceramic filler having a porous structure, a binder and a diluent, and then using a mortar gun, an airless facility, And applied on the conductor to a thickness of 0.2 to 1.5 mm. If necessary, the primary coating layer is cured and then laminated several times until the surface temperature reaches an appropriate level.

The high heat-resistant insulating coating composition may be used alone, but it may be applied on the undercoat layer in accordance with the material and condition of the conductor, the necessity of corrosion prevention, etc. When it is necessary to enhance the surface strength, water repellency, or water resistance The top layer may also be applied

As the undercoating layer, for example, at least one selected from aluminum phosphate, liquid silicate, silane hydrolyzate and heat-resistant silicon used as the ceramic filler can be used. Further purpose of the undercoating layer is to improve the adhesion of the blood conductor, it prevents corrosion of the P conductor by _{SiO 2, Al 2 O 3,} Fe 2 O 3, CaO, MgO, Na 2 O, K 2 O, TiO 2 _{, ZnO, ZrO 2, P 2} O 5 Based oxide ceramics may be mixed with each other. The undercoat layer is preferably applied in a thickness of 0.2 to 0.5 mm using a mortar gun, an airless facility, a spray or the like.

In addition, the upper layer may be applied with a thickness of 0.2 to 1.5 mm once, by suitably changing the three components, that is, the type and composition ratio of the ceramic filler, the binder and the diluent, , And can be laminated and coated several times after curing for the purpose of improving the appearance. The thicker the coating layer, the higher the adiabatic effect.

The heat-resistant insulating coating composition according to the present invention may further comprise at least one selected from the group consisting of titanium dioxide, iron oxide, chromium oxide, cobalt blue, aluminum white, iron oxide yellow, zinc sulfide, cadmium yellow, cadmium red, chrome yellow, molybdate orange, zinc chromate, And at least one inorganic pigment selected from titanium chromate, white carbon, fine clay, talc, ultramarine blue, barium sulfate, bardite powder, ferrocyanide, phosphate and carbon black.

The inorganic pigment functions to develop hue and preferably further comprises 1 to 10% by weight based on the total weight of the three components, that is, the ceramic filler, the binder and the diluent.

Hereinafter, an embodiment of the present invention will be described.

[Example]

The insulating coatings according to the present invention were prepared with the constitutional composition ratios (unit: wt%) as shown in Table 1 below.

Example One 2 3 4 5 6 7 8 ceramic
filler Silica alumina glass 15.4 7.7 7.7 15.4 15.4 15.4 15.4 15.4 Soda lime borosilicate glass 7.7 15.4 7.7 7.7 7.7 7.7 7.7 7.7 Ash 7.7 7.7 15.4 7.7 7.7 7.7 7.7 7.7 Titanium dioxide 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 bookbinder Aluminum phosphate 26.3 26.3 26.3 34.2 18.4 - - 26.3 Potassium silicate - - - - - 26.3 - - Silane hydrolyzate - - - - - - 26.3 - Polysiloxane resin - - - - - - - 2.5 diluent  Distilled water 40.4 40.4 40.4 32.5 48.3 40.4 - 37.9 Alcohol - - - - - - 40.4 - Sum 100 100 100 100 100 100 100 100

In Table 1, aluminum phosphate was prepared by reacting aluminum isopropoxide with phosphoric acid in a molar ratio of 1: 2.8, and a solid content of 48 wt% was used. Potassium silicate was composed of silica (SiO ₂ ) and alkali metal (M ₂ O) at a molar ratio of 1: 4 and having a solids content of 33 wt%. The silane hydrolyzate was prepared by hydrolyzing TMOS (Tetra methoxysilane) at a molar ratio of Si: H ₂ O of 1: 1.8 , And the polysiloxane resin having a heat resistance of 593 캜 and a solid content of 44.2% by weight by Aremco was used.

[Performance test]

The heat insulating effect, water resistance, surface strength and incombustibility of each of the heat insulating paints prepared according to the above examples were tested, and the results are shown in Table 2 below.

Example One 2 3 4 5 6 7 8 Thickness (mm) 5 5 5 5 5 5 5 5 Number of application 6 4 5 7 6 6 6 6 Surface temperature (℃) 144.6 134.8 142.3 156.5 143.2 146.7 148.4 150.9 Adiabatic temperature T (%) 58.70 61.49 59.33 55.34 59.09 58.09 57.60 56.89 Water resistance 2 2 2 2 3 3 2 One Surface strength One 3 4 One 4 2 3 2 nonflammable O O O O O O O O

A, adiabatic effect test

In Table 2, the surface temperature (占 폚) was measured by the following method. First, the carbon steel of the pitch body was sanded, and the aluminum phosphate binder of Table 1, titanium dioxide and water were mixed at a weight ratio of 4: 1: 1.5, as shown in Table 1, Respectively.

Next, the heat insulating coatings of Examples 1 to 9 were applied in a thickness of 5 mm for 4 to 7 times using a mortar gun under a heat source of 350 ° C., and then the coating layer was applied to the surface of each coating layer The temperature (占 폚) was measured.

The adiabatic temperature (T) was calculated by calculating the difference between the surface temperature and the heat source temperature by using the equation [1- (surface temperature / heat source temperature)] × 100 '. As a result, the adiabatic temperature (T) is most influenced by the thermal conductivity of the porous and hollow ceramic fillers. When the composition of the ceramic filler is the same, the higher the binder content, the lower the adiabatic temperature (T) .

B. Water resistance and Surface strength  exam

The water resistance was measured by dropping water at a height of 50 cm from the time of 1 hour to 168 hours with two drops of water per second at a temperature of 350 ° C and confirming the change of the surface. The surface of the coating layer was rubbed with a finger 10 times to compare the state between the test pieces. The water resistance and surface strength results were evaluated as 'excellent (1)> excellent (2)> good (3)> ordinary (4)> insufficient (5)'.

As a result of the test, Example 4 having a high aluminum phosphate binder content was measured to have a relatively high surface strength. Example 7 using the silane hydrolyzate exhibited excellent water resistance, but had poor cohesive strength between fillers, appear.

In Example 8 using the polysiloxane resin, it was confirmed that the waterproofing property of the polysiloxane resin failed to penetrate the water, thereby improving the water resistance.

C. Nonflammability test

Finally, the non-flammability test was carried out by leaving each sample in an electric furnace at 750 ° C for 1 hour to check changes in color, strength, and adhesion of the surface. The result was classified into 'incombustible (O)' and ' Respectively. In the case of Example 8, the polysiloxane resin was carbonized to slightly change the color, but did not affect the surface strength and adhesion.

Claims (8)

A ceramic filler having a porous structure having a particle size of 10 to 1,000 占 퐉 and a fracture strength of 200 to 30,000 psi, and at least one selected from oxide ceramic, non-oxide ceramic, glass bubble, % By weight;
Aluminum phosphate, silica (SiO ₂ ) and alkali metal (M), which are prepared by reacting aluminum isopropoxide with phosphoric acid in a molar ratio of 1: 1.5 to 4.0 and having a solid content of 10 to 60 wt% ₂ O) at a molar ratio of 1: 0.5 to 5.0 and having a solids content of 10 to 50% by weight, a cement, a silane hydrolyzate having a solid content of 5 to 60% by weight, a heat resistance of 100 10 to 40% by weight of at least one binder selected from heat-resistant silicon having a solid content of 10 to 100% by weight and a solids content of 10 to 100% by weight;
10 to 80% by weight of a diluent selected from distilled water or alcohol; The heat-resistant insulating coating composition according to claim 1,
The method according to claim 1,
Wherein an oxide-based ceramic _{is, SiO 2, Al 2 O 3} , Fe 2 O 3, CaO, MgO, Na 2 O, K 2 O, TiO 2, ZnO, ZrO 2, P 2 O 5 at least one selected from among,
The non-oxide ceramic is at least one selected from carbide, nitride, boride, and silicide,
Wherein the glass bubble is at least one selected from the group consisting of soda lime-borosilicate glass and silica alumina glass.
3. The method of claim 2,
Wherein the carbide is at least one selected from B ₄ C, SiC, TiC, ZrC, Mo ₂ C and WC,
The nitride is, and any one or more selected from the group consisting of BN, AlN, Si ₃ N _4, TiN, ZrN,
The boride is selected from the group consisting of AlB ₂ , TiB ₂ , ZrB ₂ , ≪ / RTI >
Wherein the silicide is at least one selected from MoSi ₂ and WSi.
3. The method according to claim 1 or 2,
Wherein the basic liquid silicate is at least one selected from the group consisting of potassium silicate, sodium silicate, lithium silicate, and aluminum silicate.
3. The method according to claim 1 or 2,
Wherein the cement is selected from the group consisting of hard cement selected from lime, lauric lime, gypsum and magnesia cement; Portland cement, hydraulic lime, natural cement, Roman cement; Mixed cement selected from blast furnace slag cement, fly ash cement, and Portland pozzolan cement; Special cement selected from white portland cement, thermal insulation cement, inflatable hydraulic cement, marshalli cement, aged steel cement, ultra rapid cement, silica cement, alumina cement, bag cement, oil well cement and tile cement; Wherein the heat resistant coating composition is at least one of the following.
3. The method according to claim 1 or 2,
The silane hydrolyzate is a compound represented by the formula R ' _n -Si- (OR) _4-n (wherein R' is a hydrocarbon compound having an alkyl group having 1 to 16 carbon atoms, or a vinyl, epoxy, styryl, methacryloxy, Acrylsilane, acryloxy, amino, chloropropyl, mercapto, sulfido, isocyanato group and a thin silane coupling agent, R is a hydrocarbon compound having 1 to 6 carbon atoms, and n is 0 to 4) A hydrolysis of the alkoxysilane monomer or silicate, or a mixture thereof, and a reaction of Si: H ₂ O at a molar ratio of 1: 0.1 to 50 is used.
3. The method according to claim 1 or 2,
The heat-resistant silicon may be at least one selected from the group consisting of polysiloxane (Silicone, Si-O), polysilane (Si-Si), polysilathiane (Si-S), polycarbosilane Wherein the coating composition is at least one selected from the group consisting of polysilazane (Si-N) and polysilaphosphane (Si-P).
7 to 16% by weight of soda lime borosilicate glass, 7 to 16% by weight of silica alumina glass, 7 to 8% by weight of volcanic ash, and 2 to 3% by weight of titanium dioxide as the ceramic filler;
18 to 35% by weight of aluminum phosphate which is prepared by reacting aluminum isopropoxide with phosphoric acid in a molar ratio of 1: 2.8 and has a solid content of 48% by weight;
Wherein the diluent comprises 30 to 50% by weight of distilled water as a diluent.