JP4446403B2 - Manufacturing method of coating material - Google Patents

Description

  The present invention relates to a method for producing a coating material excellent in various performances such as high heat insulating properties, sterilization properties, and antifouling properties, and a coating material obtained by the production method.

  In recent years, for the purpose of energy saving, global warming, urban heat island countermeasures, CO2 emission reduction, etc., greening facilities have been installed on the rooftops of buildings, and heat and thermal barrier coatings have been applied to the roofs and outer walls of buildings. As a result, technology that reduces the temperature inside the building and reduces the cost of electricity required for cooling has become widespread.

  As an example of constructing a greening facility on the roof of the former building, there is known a method in which a waterproof sheet is laid on the roof and a greening base is arranged on the roof (for example, see Patent Document 1). As the latter heat-resistant and heat-shielding paint, those using glass-based or shirasu-based ceramic materials as main raw materials are known (for example, see Patent Document 2).

  On the other hand, in recent years, there is an increasing need for prevention of virus infection such as chicken flu in poultry houses, livestock houses, etc., and the development of coating agents with excellent antibacterial and sterilizing properties has been screamed. As a paint exhibiting antibacterial properties and the like, those containing titanium oxide are known (see, for example, Patent Document 3).

JP 2004-89005 A JP 2001-192281 A Japanese Patent Laid-Open No. 10-81840

  However, the example of the greening facility has a problem that the cost of construction and maintenance is high. In the case of heat-resistant and heat-shielding paints, the main material is glass-based or silica-based ceramic materials with high thermal conductivity. There is a problem of high costs.

  In the case of a paint containing titanium oxide, since the specific gravity of titanium oxide exceeds 1, when titanium oxide is kneaded with ceramic particles or a solvent, the titanium oxide settles compared to the ceramic particles, and the coating layer Titanium oxide does not float on the surface layer part of the film, and a solvent film may be coated on the surface layer part. Thus, there has been a problem that the antibacterial and sterilizing actions after application cannot be sufficiently exhibited.

  The present inventor succeeded in floating a photocatalyst material typified by a titanium compound having a specific gravity of more than 1 and an air catalyst material typified by potassium having a specific gravity of more than 1 in the surface layer portion of the kneaded material, and has high heat insulating properties. In addition, a coating material excellent in sterilization could be produced. Moreover, it confirmed that it was excellent also in the construction cost.

  Therefore, this invention aims at providing the manufacturing method which can obtain the coating material excellent in high heat insulation and sterilization property, and also providing the manufacturing method of the coating material excellent in construction cost. .

  Furthermore, this invention aims at providing the coating material obtained by the manufacturing method.

In order to solve the above-mentioned problem, the manufacturing method of the coating material according to claim 1 according to the present invention, kneading water and a water-soluble resin into ceramic or glass balloon particles having a specific gravity of less than 1 , A first kneading step for obtaining a primary kneaded product in which balloon particles are coated with a water-soluble resin, and a kneaded photocatalytic substance having a specific gravity of more than 1 in the primary kneaded product obtained in the first kneading step. And a second kneading step of obtaining a secondary kneaded product in which a photocatalytic material is bonded to balloon particles using a water-soluble resin as a binder .

  In the first kneading step, water and a water-soluble resin are kneaded into ceramic or glass-based balloon particles having a specific gravity of less than 1, whereby the balloon particles are stirred and dispersed in the aqueous solution, and around the individual balloon particles. Water-soluble resin is coated. In the second kneading step, the water-soluble resin coated around the individual balloon particles is mixed with the binder by mixing the photocatalyst material having a specific gravity of more than 1 with the primary kneaded product obtained in the first kneading step. Thus, each photocatalytic material is evenly and reliably bonded to the individual balloon particles. Then, the photocatalytic material having a specific gravity of more than 1 bound to the individual balloon particles floats on the surface layer portion of the kneaded material by the buoyancy of the individual balloon particles. Here, the photocatalytic material is represented by a titanium compound, and exhibits various functions such as sterilization by photocatalytic action. Examples of the photocatalytic material having a specific gravity exceeding 1 include titanium oxide and titanium apatite.

  The photocatalytic material having a specific gravity of more than 1 settles according to its weight and does not float on the surface layer portion of the kneaded product in the past, but floats on the surface layer portion of the kneaded material using the buoyancy of individual balloon particles. Balloon particles and their catalytic materials can be exposed side by side on the surface. As a result, it is possible to manufacture a coating material in which the photocatalytic material floats on the surface layer portion when the coating material is applied, and the balloon particles and the photocatalyst material are aligned with each other on the surface layer portion of the applied coating material layer.

  Balloon particles and photocatalyst material are lined up on the surface layer of the coating material layer, so the high heat insulation that the balloon particles mainly exhibit, and the antibacterial and sterilization functions that the photocatalyst material exhibits when irradiated with ultraviolet rays are simultaneously demonstrated. . In winter, it exhibits a high thermal insulation function. In addition, after the coating material layer is dried, the resin firmly maintains the bonding state between the balloon particles and their catalytic substances, and demonstrates the durability of the coating material layer. Furthermore, the organic solvent is removed using a water-soluble resin. Since it is not used, the organic solvent is exposed on the surface layer as in the prior art, and does not hinder the original function of the photocatalytic material.

  Since the photocatalytic material can be arranged on the surface layer, it exhibits high antifouling properties that sufficiently exhibit the photocatalytic action.

In the first kneading step, the coating material manufacturing method according to claim 2 according to the present invention kneads 10 to 55 wt% of water and 10 to 80 wt% of water-soluble resin with respect to 100 wt% of balloon particles. It is characterized by doing.

  The method for producing a coating material according to claim 3 according to the present invention is characterized in that, in the second kneading step, 1 to 80 wt% of the photocatalytic material is kneaded with respect to 100 wt% of the primary kneaded material. .

  The method for producing a coating material according to claim 4 of the present invention is characterized in that the photocatalytic material is titanium oxide.

Titanium oxide (TiO ₂ ) exhibits antibacterial and antifouling properties against viruses and dirt by the photocatalytic effect, and titanium oxide is evenly arranged on the surface layer of the coating layer, so that titanium oxide is inherently sterilizable. -The antifouling property can be exhibited sufficiently. Therefore, by applying the coating material to the roof, outer wall, etc. of buildings such as poultry houses, livestock houses, houses, food factories, hospitals, etc., it is possible to prevent the invasion of viruses and prevent the buildings from being stained.

  The method for producing a coating material according to claim 5 of the present invention is characterized in that the photocatalytic material is titanium apatite.

In titanium apatite, a part of calcium apatite is substituted by titanium, for example, Ca ₉ Ti ₁ in which a part of calcium in calcium hydroxyapatite represented by Ca ₁₀ (PO ₄ ) ₆ (OH) ₂ is substituted by titanium. It is represented by (PO ₄ ) ₆ (OH) ₂ .

  Titanium apatite actively attracts and absorbs floating viruses and sterilizes them. When the titanium apatite is evenly arranged in the surface layer portion of the coating material layer, the adsorption and sterilization performance is sufficiently exhibited. Moreover, antifouling property is also exhibited. Therefore, it is possible to attract and sterilize viruses in the air by applying a coating material to the floor or inner wall of a building such as a birdhouse, livestock house, house, food factory, or hospital.

The method for producing a coating material according to claim 6 of the present invention is characterized in that an average porosity of the balloon particles is 20% or more.

  When the average porosity of the balloon particles is 20% or more, the thermal conductivity is lowered and high heat insulation is exhibited. The average porosity is more preferably 60% or more. Conventional balloon particles such as glass-based ones have an average porosity of 10% or less, and 4-8 layers have been overcoated to obtain high heat insulation. By simply constructing, sufficient heat insulation and sterilization can be exhibited, and construction costs can be reduced.

The method for producing a coating material according to claim 7 of the present invention is characterized in that the balloon particles are spherical.

  When the balloon particles are spherical, the liquid coating material is easy to be stretched during construction, and therefore easy to construct on site. Moreover, the coating material layer can be formed thin, and the construction cost can be reduced.

The method for producing a coating material according to an eighth aspect of the present invention is characterized in that the balloon particles are aluminum oxide.

When the balloon particles are aluminum oxide (Al ₂ O ₃ ), the balloon shape is less likely to be indefinite than the glass-based / shirasu-based balloon particles, and the balloon particles having a stable shape can be obtained. The aluminum oxide balloon particles are obtained by baking aluminum oxide at a high temperature of about 1400 ° C., and spherical balloon particles having a porosity of 20% or more can be stably obtained.

As described above, according to the method for manufacturing a coating material according to the present invention, water and a water-soluble resin are kneaded with ceramic or glass balloon particles having a specific gravity of less than 1, and the water-soluble resin is mixed with the balloon particles. The first kneading step to obtain the primary kneaded material coated with, and the primary kneaded material obtained in the first kneading step are kneaded with a photocatalytic substance having a specific gravity of more than 1, and a water-soluble resin is bound as a binder. And a second kneading step for obtaining a secondary kneaded product in which the photocatalyst material is bonded to the balloon particles, and in the second kneading step, the balloon particles are bonded to the balloon particles using the buoyancy of the balloon particles. A photocatalytic material with a specific gravity exceeding 1 floats on the surface layer of the kneaded product, and the balloon particles and the photocatalyst material can be evenly arranged on the surface layer. As a result, the coating material has excellent heat insulation and sterilization. An excellent effect that it is possible to manufacture.

  Moreover, since each said function can be exhibited only by apply | coating about 1-2 layers, there exists an effect that it is excellent also in construction cost.

  Furthermore, according to the coating material obtained by the production method according to the present invention, the above-described coating layer excellent in both high heat insulation and sterilization can be easily applied to the roof of the building and the inner and outer walls. Play.

  A first embodiment for carrying out the present invention will be described with reference to FIGS. In FIG. 1, 1 is a kneading apparatus.

  In the kneading apparatus 1, a disc-shaped stirring plate 3 is horizontally disposed near the bottom of a bottomed cylindrical container 2, and this stirring plate 3 is supported by a vertical shaft 4 and is rotationally driven by a drive motor 5. Each material thrown into 2 can be stirred and kneaded.

(First kneading step)
First, as shown in FIG. 1A, in the first kneading step, the ceramic balloon particles 6, water 7 and water-soluble resin 8 are put into the container 2, and the stirring plate 3 is moved by the drive motor 5. Rotate and knead each material to obtain a primary kneaded product 9. The blending ratio of each material is 50 parts by weight of water and 50 parts by weight of a water-soluble resin with respect to 100 parts by weight of the ceramic balloon particles.

  In addition, water can be appropriately selected from 10 to 55 parts by weight and water-soluble resin from 10 to 80 parts by weight with respect to 100 parts by weight of the ceramic balloon particles.

  By rotating the stirring plate 3 in the container 2, the ceramic balloon particles 6 are stirred and dispersed in the aqueous solution, and the water-soluble resin 8 is coated around each balloon particle 6 as shown in FIG. Further, since the stirring is performed using the horizontal disk-shaped stirring plate 3, the ceramic balloon particles 6 are prevented from being damaged or crushed.

The ceramic balloon particles 6 are made of a spherical body of aluminum oxide (Al ₂ O ₃ ) having a particle size of 20 to 60 microns, an average porosity of 20% or more, and a specific gravity of 0.8 or less. When the aluminum oxide is fired at a high temperature of about 1400 ° C., balloon particles having a spherical shape and an average porosity of 20% or more can be stably obtained. Note that an acrylic resin or the like is used as the water-soluble resin 8.

(Second kneading step)
Next, as shown in FIG. 1 (B), in the second kneading step, the titanium oxide 10 that is a photocatalytic material having a specific gravity of more than 1 is added to the primary kneaded material 9 in the container 2 obtained in the first kneading step. The stirring plate 3 is continuously rotated and kneaded to obtain a secondary kneaded material (coating material) 11. The blending ratio is 30 parts by weight of titanium oxide with respect to 100 parts by weight of the primary kneaded product.

  In addition, a titanium oxide can be suitably selected from 1-80 weight part with respect to 100 weight part of primary kneaded materials.

  In the subsequent second kneading step, by introducing the titanium oxide 10, as shown in FIG. 3, the water-soluble resin 8 coated around the individual balloon particles 6 in the primary kneaded product 9 becomes a binder. Thus, each titanium oxide 10 is evenly and reliably bonded around the individual balloon particles 6. The individual balloon particles / titanium oxide combination 12 may be combined with each other to form a unit U. Then, as shown in FIG. 4, the individual balloon particles / titanium oxide conjugate 12 or the combined unit U of the individual balloon particles / titanium oxide conjugate 12 is secondarily kneaded by the buoyancy of the individual balloon particles 6. It floats on the surface layer part A of the object 11.

Titanium oxide (TiO ₂ ) has a specific gravity of more than 1 (specific gravity of 3.0 to 3.9), so it settles after kneading due to its weight, and conventionally it did not float on the surface layer of the kneaded product, The buoyancy of the individual balloon particles 6 can be used to float on the surface layer portion of the secondary kneaded material 11. Thereby, as shown in FIG. 5, the coating material layer 13 in which the titanium oxide 10 is aligned in the surface layer portion and exposed on the surface can be applied at the time of coating. In FIG. 5, reference numeral 14 denotes a lower layer part that is an adhesive part, and reference numeral 15 denotes an outer wall.

  FIG. 6 shows a structure in which the coating material manufactured by the coating material manufacturing method of the present invention is applied to the roof 21 and the outer wall 22 of the building 20.

  As shown in FIG. 6, by applying one or two coating material layers 13 on the roof 21 of the building 20, it is possible to exhibit high heat insulation and protect the building 20 from sunlight radiant heat. For example, compared to a roof without construction, the temperature on the roof can be reduced by about 30 ° C. at the maximum, and the temperature in the building can be kept substantially constant. Moreover, the virus which adhered to the surface of the coating material layer 13 can be sterilized by the photocatalytic effect by the ultraviolet irradiation of the titanium oxide 10 by constructing 1-2 layers of the coating material layer 13 on the outer wall 22. Further, in winter, a high heat insulation function is exhibited by the high heat insulating performance of the coating material layer 13 on the roof 21 and the outer wall 22.

  Next, a second embodiment of the present invention will be described with reference to FIG. In the present embodiment, in the second kneading step, titanium apatite, which is another photocatalytic material, is introduced instead of titanium oxide 10.

(First kneading step)
In the first kneading step, as in the first embodiment, as shown in FIG. 7A, the ceramic balloon particles 6, water 7 and water-soluble resin 8 are put into the container 2, Each material is kneaded to obtain a primary kneaded material 9 '. The blending ratio of each material is 50 parts by weight of water and 50 parts by weight of a water-soluble resin with respect to 100 parts by weight of the ceramic balloon particles. Here, as the ceramic balloon particles 6, a spherical body of aluminum oxide (Al ₂ O ₃ ) having a particle size of 20 to 60 microns, an average porosity of 20% or more and a specific gravity of 0.8 or less is used.

(Second kneading step)
In the second kneading step, as shown in FIG. 7B, titanium apatite is put into the primary kneaded material 9 ′ in the container 2 obtained in the first kneading step, and the stirring plate 3 is continuously rotated. And kneaded to obtain a secondary kneaded material (coating material) 17. The blending ratio is 30 parts by weight of titanium apatite with respect to 100 parts by weight of the primary kneaded product. The compounding quantity of a titanium apatite can be suitably selected between 1-80 weight part with respect to 100 weight part of primary kneaded materials.

  In the second kneading step, by adding titanium apatite, the water-soluble resin 8 coated around the individual balloon particles 6 in the primary kneaded material 9 ′ becomes a binder, Titanium apatite bonds evenly and reliably. Then, as shown in FIG. 8, by the buoyancy of the individual balloon particles 6, the titanium apatite 16 bonded to the individual balloon particles 6 as a combined balloon particle / titanium apatite or as a composite unit thereof is secondarily kneaded. It floats on the surface layer part A ′ of the object 17.

Titanium apatite is obtained by replacing a part of calcium apatite with titanium. For example, a part of calcium in calcium hydroxyapatite represented by Ca ₁₀ (PO ₄ ) ₆ (OH) ₂ is replaced by titanium. What is represented by ₉ Ti ₁ (PO ₄ ) ₆ (OH) ₂ is used. Since titanium apatite has a specific gravity exceeding 1 (specific gravity 2.0 to 3.9), it floats to the surface layer portion A ′ of the secondary kneaded material 17 using the buoyancy of individual balloon particles 6 in the same manner as titanium oxide. Can be made. As a result, as shown in FIG. 9, the titanium apatite 16 is levitated during the coating process, and the coating material layer 18 in which the titanium apatite 16 is exposed and arranged on the surface can be applied.

  One to two coating material layers 17 are formed on the inner wall 23 and floor 24 of the building 20 shown in FIG. 6 where the titanium apatite 16 is exposed and arranged on the surface, and are suspended in the air by the titanium apatite 16 arranged and exposed on the surface. Can effectively attract and adsorb the virus to be sterilized.

  The coating material manufacturing method according to the present invention can be used as a coating material manufacturing method that can be applied to factories, warehouses, public facilities, ordinary houses, passenger cars, buses, containers, and the like.

The 1st embodiment is shown, (A) (B) is an explanatory view showing the manufacture procedure of the coating material concerning the present invention, Explanatory drawing which shows a mode that water-soluble resin is coated around each balloon particle in a 1st kneading process, Explanatory drawing which shows a mode that the titanium oxide was couple | bonded around each balloon particle in a 2nd kneading | mixing process, Explanatory drawing which shows a mode that titanium oxide also floated on the surface layer part of the secondary kneaded material by the buoyancy of each balloon particle, Sectional drawing which shows the construction state of a coating material layer, Sectional view of a building with a coating material layer, The 1st embodiment is shown, (A) (B) is an explanatory view showing the manufacture procedure of the coating material concerning the present invention, Explanatory drawing which shows a mode that titanium oxide also floated on the surface layer part of the secondary kneaded material by the buoyancy of each balloon particle, It is sectional drawing which shows the construction state of a coating material layer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Kneading apparatus 2 Container 3 Stirring plate 4 Vertical shaft 5 Drive motor 6 Ceramic balloon particle 7 Water 8 Water-soluble resin 9, 9 'Primary kneaded material 10 Titanium oxide (photocatalytic material)
11, 17 Secondary kneaded material (coating material)
12 Balloon particle / titanium oxide combined body 13, 18 Coating material layer 14 Lower layer part (adhesion part)
15, 22 Outer wall 16 Titanium apatite (photocatalytic material)
20 Building 21 Roof 23 Inner wall 24 Floor U Combined unit of balloon particles and titanium oxide

Claims (8)

A first kneading step of obtaining a primary kneaded product obtained by kneading water and a water-soluble resin into ceramic or glass-based balloon particles having a specific gravity of less than 1 to coat the balloon particles with a water-soluble resin ; A primary kneaded product obtained in one kneading step is kneaded with a photocatalytic substance having a specific gravity of more than 1 to obtain a secondary kneaded product in which a photocatalytic material is bonded to balloon particles using a water-soluble resin as a binder . The manufacturing method of the coating material characterized by including 2 kneading processes. 2. The coating material according to claim 1, wherein in the first kneading step, 10 to 55 wt% water and 10 to 80 wt% water-soluble resin are kneaded with respect to 100 wt% balloon particles. Method.   3. The method for producing a coating material according to claim 1, wherein in the second kneading step, 1 to 80 wt% of the photocatalytic material is kneaded with respect to 100 wt% of the primary kneaded material. .   The said photocatalyst material is a titanium oxide, The manufacturing method of the coating material as described in any one of Claim 1 thru | or 3 characterized by the above-mentioned.   The method for producing a coating material according to any one of claims 1 to 3, wherein the photocatalytic material is titanium apatite. The method for producing a coating material according to any one of claims 1 to 5 , wherein an average porosity of the balloon particles is 20% or more. The method for producing a coating material according to any one of claims 1 to 6 , wherein the balloon particles are spherical bodies. The method for manufacturing a coating material according to any one of claims 1 to 7 , wherein the balloon particles are aluminum oxide.

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