Glossy coating material, surface finishing method, and tabletop

Abstract

To provide: a glossy coating material having glossiness even while having hardness used for even the surface to be targeted of a top board, etc.; a surface finishing method; and a top board.SOLUTION: A glossy coating material includes an aggregate of 30-65 wt.%, a cement material of 10-40 wt.%, a synthetic resin of 2-10 wt.% and water. The aggregate includes powder having a Mohs hardness of more than 6 and powder having a Mohs hardness of less than 4; the average particle size of the powder having a Mohs hardness of more than 6 is larger than that of the powder having a Mohs hardness of less than 4; and a surface finishing method comprises steps of applying the glossy coating material to the surface to be targeted while pressing; and polishing the surface of a finishing layer formed by curing the glossy coating material with an abradant.SELECTED DRAWING: Figure 1

Description

Technical Field

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[0005]

[0001] The present invention relates to a glossy coating material, a surface finishing method, and a top plate.

Background Art

[0002] In addition to walls and floors, a finishing layer having various functions is formed by applying and curing (drying) a coating material on a target surface such as fittings, furniture, and a top plate.

[0003] For example, as in Patent Document 1, there is a coating material for a glossy wall surface having high design properties with glossiness. Also, as in Patent Document 2, there are inorganic and organic hybrid type non-combustible paints having flexibility, coating film strength, and high toughness. Further, as in Patent Document 3, there is a decorative material having a wood grain pattern, which has little aging change such as peeling and swelling and is non-combustible.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] In Patent Document 1, although it has glossiness, it does not have the hardness applicable to a top plate. Also, in Patent Documents 2 and 3, although they are non-combustible and excellent in mechanical strength, they do not have glossiness.

[0006] The present invention has been made in view of the above matters, and an object thereof is to provide a glossy coating material, a surface finishing method, and a top plate that have glossiness while having hardness that can also be used for a target surface such as a top plate. [Means for solving the problem]

[0007] A glossy coating material according to the first aspect of the present invention is A gloss coating material for the finishing layer, Aggregates making up 30-65% by weight, 10-40% by weight of cement material, 2-10% by weight of synthetic resin, It contains water, The aggregate comprises powder with a Mohs hardness greater than 6 and powder with a Mohs hardness less than 4, wherein the average particle size of the powder with a Mohs hardness greater than 6 is larger than the average particle size of the powder with a Mohs hardness less than 4. Ku , The aforementioned glossy coating material becomes glossy when polished after hardening. It is characterized by the following:

[0008] Furthermore, it is preferable that the powder with a Mohs hardness greater than 6 is silica sand, and the powder with a Mohs hardness less than 4 is one or more selected from the group consisting of talc, calcium carbonate, and aluminum hydroxide.

[0009] Furthermore, it is preferable that the ratio of the average particle sizes of powders with a Mohs hardness greater than 6 to powders with a Mohs hardness less than 4 is 1.4:1 to 600:1.

[0010] Furthermore, it is preferable that the average particle size of the powder with a Mohs hardness greater than 6 is 100 to 600 μm, and the average particle size of the powder with a Mohs hardness less than 4 is 1 to 70 μm.

[0011] Furthermore, it is preferable that the mixing ratio of the powder with a Mohs hardness greater than 6 to the powder with a Mohs hardness less than 4 is 3:1 to 6:1 by weight.

[0012] A glossy coating material according to a second aspect of the present invention is: For tabletop Light A slippery coating material 、 Aggregates making up 30-65% by weight, 10-40% by weight of cement material, 2-10% by weight of synthetic resin, It contains water, The aggregate comprises powder with a Mohs hardness greater than 6 and powder with a Mohs hardness less than 4, wherein the average particle size of the powder with a Mohs hardness greater than 6 is greater than the average particle size of the powder with a Mohs hardness less than 4. Characterized by 。

[0013] The surface finishing method according to the 3 viewpoint of the present invention comprises: a step of applying a gloss paint according to the first viewpoint of the present invention while pressing it against the target surface; Or a glossy coating material according to the second aspect of the present invention a step of polishing the surface of the finish layer formed by curing the gloss paint with an abrasive; and is characterized by including .

[0014] Also, polishing may be performed using a sander to which the abrasive is attached.

[0015] The top plate according to the 4 viewpoint of the present invention is a top plate having a finish layer, wherein the finish layer contains 30 to 65% by weight of aggregate, 10 to 40% by weight of cementitious material, 2 to 10% by weight of synthetic resin and water, the aggregate includes powder with a Mohs hardness greater than 6 and powder with a Mohs hardness less than 4, and the average particle size of the powder with a Mohs hardness greater than 6 is larger than the average particle size of the powder with a Mohs hardness less than 4, and is formed by applying a gloss paint, curing it, and then polishing it with an abrasive; the surface of the finish layer has a scratch hardness of 7H or more as defined in JIS K5600-5-4; and is characterized by

[0016] Also, a coating layer may be provided on the finish layer.

[0017] The gloss paint according to the 5 viewpoint of the present invention is A gloss coating material for the finishing layer, 30 to 70% by weight of aggregate, and 10-40% by weight of cement material, 2-10% by weight of synthetic resin, It contains water, The aggregate comprises powder with a Mohs hardness greater than 6 and powder with a Mohs hardness less than 4, wherein the average particle size of the powder with a Mohs hardness greater than 6 is larger than the average particle size of the powder with a Mohs hardness less than 4. Ku , The aforementioned glossy coating material becomes glossy when polished after hardening. It is characterized by the following: [Effects of the Invention]

[0018] According to the present invention, it is possible to provide a glossy coating material, a surface finishing method, and a tabletop that have gloss while possessing hardness suitable for use on surfaces such as tabletops. [Brief explanation of the drawing]

[0019] [Figure 1] Figures 1(A) to 1(C) are schematic diagrams illustrating surface finishing methods. [Modes for carrying out the invention]

[0020] <Glossy coating material> Glossy coatings form a finishing layer when applied to surfaces such as tabletops, desks, walls, and floors, and then cured. Glossy coatings contain aggregate, cement material, synthetic resin, and water.

[0021] The aggregate includes powders with a Mohs hardness greater than 6 and powders with a Mohs hardness less than 4. The powders with a Mohs hardness greater than 6 enhance the mechanical strength of the finishing layer, particularly increasing its hardness. The powders with a Mohs hardness less than 4 enhance gloss. Mohs hardness is an index of material hardness, indicating resistance to scratching with a certain object on a scale of 1 to 10. The powders with a Mohs hardness greater than 6 in this invention are preferably powders with a Mohs hardness of 6.5 to 10, and more preferably powders with a Mohs hardness of 7 to 8. The powders with a Mohs hardness less than 4 in this invention are preferably powders with a Mohs hardness of 0.5 to 3.5, and more preferably powders with a Mohs hardness of 1 to 3.

[0022] The average particle size of powders with a Mohs hardness greater than 6 is larger than the average particle size of powders with a Mohs hardness less than 4. As a result, in the finished layer, powders with a Mohs hardness less than 4 are positioned to fill the gaps between powders with a Mohs hardness greater than 6. This close contact between aggregates increases the bonding strength, leading to improved mechanical strength of the finished layer. In addition, powders with a Mohs hardness less than 4 are more easily exposed on the surface of the finished layer, allowing the gloss of the finished layer to be fully exhibited, as explained in the surface finishing method described later. The average particle size of this invention can be measured as follows: Using sieves and a receiving tray with different mesh sizes, stack the sieves so that the sieves with larger mesh sizes are on top of the receiving tray. Place the sample from the top of the sieve and stack it on the receiving tray so that the sieves with larger mesh sizes are on top. Set the stacked sieves in a sieve shaker and shake for 10 minutes to perform sieving. The sieve shaker may be used with a vibration frequency of 3600 times / min and an amplitude of 1 mm. For measuring particle size distribution, methods and equipment (sieves) described in JIS Z 8815 or JIS Z 8801 may be used.

[0023] The ratio of the average particle sizes of powders with a Mohs hardness greater than 6 to powders with a Mohs hardness less than 4 should be such that in the finished layer, the gaps between the powders with a Mohs hardness greater than 6 are sufficiently filled by the powders with a Mohs hardness less than 4, and the powders with a Mohs hardness less than 4 are exposed on the surface of the finished layer. For example, it is 1.4:1 to 600:1, preferably 6:1 to 450:1, more preferably 10:1 to 450:1, and even more preferably 15:1 to 70:1.

[0024] Any material capable of exhibiting the above functions as a powder with a Mohs hardness greater than 6 is acceptable, and a specific example is silica sand. The average particle size of the powder with a Mohs hardness greater than 6 should be set according to the thickness of the finished layer to be formed, and is preferably 100 to 600 μm, and more preferably 200 to 450 μm.

[0025] Any material capable of exhibiting the above functions can be used as a powder with a Mohs hardness of less than 4. Specifically, examples include talc, calcium carbonate, aluminum hydroxide, gypsum, mica, clay, and kaolin. Of these, one or more selected from the group consisting of talc, calcium carbonate, and aluminum hydroxide are preferred. The average particle size of the powder with a Mohs hardness of less than 4 is smaller than the average particle size of the powder with a Mohs hardness greater than 6, for example, 1 to 70 μm, preferably 1 to 30 μm, and more preferably 1 to 20 μm. If the average particle size of the powder with a Mohs hardness of less than 4 is larger than the above range, sufficient gloss cannot be obtained. The reason is not clear, but it is thought that when the average particle size is larger than the above range, the powder with a Mohs hardness of less than 4 is difficult to uniformly distribute within the finishing layer, causing light reflection to scatter and making surface reflection difficult.

[0026] In gloss coatings, the aggregate content is 30-65% by weight or 30-70% by weight, more preferably 30-65% by weight, and even more preferably 45-65% by weight. If the aggregate content is less than the above range, the viscosity of the gloss coating will be insufficient, making it prone to dripping when applied to the target surface and resulting in poor trowel release. This leads to poor application workability. Furthermore, it may not be able to conceal the substrate, causing the substrate to show through and potentially impairing the aesthetic appearance. On the other hand, if the aggregate content is more than the above range, the gloss coating becomes rough, making it difficult to apply to a consistent thickness, worsening application workability, and relatively reducing the content of cement material and synthetic resin, thus decreasing the strength of the finishing layer.

[0027] Furthermore, the mixing ratio of powders with a Mohs hardness greater than 6 to powders with a Mohs hardness less than 4 is preferably 3:1 to 6:1 by weight.

[0028] The cement material functions as an inorganic binder, binding and linking the aggregate together with the synthetic resin described later. The inclusion of cement material increases mechanical strength and improves the fire resistance and creep resistance of the finishing layer. Examples of cement materials include ordinary Portland cement, white cement, and fly ash cement. When using the coloring pigments described later, white cement is preferable from the viewpoint of color development of the coloring pigments. The cement material content in the gloss coating material is 10-40% by weight, preferably 17-35% by weight.

[0029] Synthetic resins function as organic binders and exhibit coating film-forming ability. Synthetic resins may be water-soluble or water-dispersible, and are not particularly limited as long as they exhibit the above functions; conventionally known resins can be used. Examples of synthetic resins include acrylic resins, polyvinyl acetate resins, polyurethane resins, silicone resins, fluororesins, epoxy resins, phenolic resins, polyester resins, alkyd resins, polycarbonate resins, and melamine resins, which can be used individually or in combination of two or more. Furthermore, these synthetic resins may be modified, such as urethane-modified acrylic resins, or graft-polymerized, or in the form of dispersed particles. Acrylic resins are preferred as synthetic resins to enhance the water resistance of the finishing layer. Examples of acrylic resins include acrylic acid esters, acrylic methacrylate copolymers, acrylic styrene copolymers, and acrylic resin ethylene vinyl acetate copolymers.

[0030] Furthermore, the synthetic resin content in the gloss coating material is 2 to 10% by weight, and more preferably 4 to 6% by weight. If the synthetic resin content is less than the above range, the water resistance of the finishing layer will decrease. On the other hand, if the synthetic resin content is more than the above range, the curing speed will become too fast and the coating will not release easily from the trowel, leading to poor workability. In addition, the relative decrease in aggregate content may prevent the substrate from being concealed, potentially resulting in a poor appearance as the substrate shows through.

[0031] Furthermore, the synthetic resin may be used in the form of a synthetic resin emulsion. In this case, the solid content (synthetic resin) in the synthetic resin emulsion of the gloss coating material will be within the range of the above-mentioned synthetic resin content.

[0032] The water content in gloss coatings is approximately 10-20% by weight. Note that when synthetic resins are used as a synthetic resin emulsion, the total water content, including the water content in the synthetic resin emulsion, falls within the above water content range.

[0033] In addition to the components listed above, gloss coatings may contain additives as needed, such as thickeners, dispersants, deodorizers, preservatives, fungicides, defoamers, antifreezes, formaldehyde adsorbents and decomposers, surface skinning inhibitors, water repellents, hardening retarders, air-entraining agents (AE agents), water-reducing agents, AE water-reducing agents, high-performance water-reducing agents, high-performance AE water-reducing agents, fluidizers, foaming agents, foaming agents, leveling agents, and pH adjusters. When additives are included, the additive content in the gloss coating is preferably 0.001 to 2% by weight, and more preferably 0.01 to 1% by weight.

[0034] Silicone-based water repellents such as alkylalkoxysilanes including n-propyltrimethoxysilane, hexyltrimethoxysilane, and phenyltrimethoxysilane; organopolysiloxanes such as dimethylpolysiloxane; modified silicones derived from modified organopolysiloxanes such as alkyl-modified polysiloxanes, phenyl-modified polysiloxanes, polyester-modified polysiloxanes, and polyether-modified polysiloxanes; Paraffin-based water repellents such as paraffin wax; Examples of stearin-based water repellents include glyceryl stearate, stearamide, zinc stearate, calcium stearate, diethanolamide stearate, magnesium stearate, aluminum stearate, zirconium stearate, pyridinium salts such as stearamide methylpyridium chloride, methylolaramid, and ethylene urea. These can be used individually or in combination of two or more types.

[0035] As hardening retarders, organic acids such as citric acid, gluconic acid, glucoheptonic acid, arabonic acid, tartaric acid, malic acid, and polyphosphate, or inorganic salts thereof such as sodium, potassium, calcium, magnesium, and ammonium; Sugars such as glucose, fructose, galactose, sucrose, xylose, arabinose, ribose, oligosaccharides, and dextran, or their derivatives; Water-soluble polymers such as polyvinyl alcohol; Cellulose derivatives such as hydroxyethylcellulose and carboxymethylhydroxyethylcellulose; Lignosulfonates such as sodium lignosulfonate and calcium lignosulfonate; amino acids or amino acid salts; Peptide compounds; Boric acid or borates such as sodium metaborate, sodium tetraborate, and potassium pentaborate; Zinc oxide, zinc chloride, zinc carbonate, lead monoxide, phosphates, fluorosilicides, fluorosilicides, and phosphate complexes; Copper hydroxide; Borax; Examples include magnesia salt, which can be used individually or in combination of two or more types.

[0036] Furthermore, the gloss coating material may also contain a coloring pigment. The coloring pigment may be added to and mixed with the gloss coating material before use, that is, it may be in the form of a set of gloss coating material and coloring pigment. By doing so, by preparing a single type of gloss coating material and multiple types of coloring pigments, it is possible to select a coloring pigment that exhibits the desired color as appropriate at the site of use and add it to the gloss coating material to form a finish layer of various colors, which is highly convenient.

[0037] <Surface finishing method> The surface finishing method involves first applying the aforementioned gloss coating material to the target surface, such as a countertop, wall, or floor. It is preferable to use an application tool, such as a trowel, that allows for application while pressing the gloss coating material against the target surface.

[0038] When a gloss coating is applied without pressing it down, as shown in Figure 1(A), powder particles with a Mohs hardness greater than 6 float to the top layer. Even if the coating is cured (dried) in this state and polished with an abrasive as described later, sufficient gloss will not be produced.

[0039] On the other hand, by applying the gloss coating material while pressing it against the surface with an application tool, powders with a Mohs hardness greater than 6 will sink to the lower layer, as shown in Figure 1(B). By hardening (drying) the gloss coating material in this state, a finishing layer is formed. Note that the surface of the finishing layer is not sufficiently glossy at this stage.

[0040] Next, the surface of the formed finish layer is polished with an abrasive. As shown in Figure 1(C), the smoother the polished area of ​​the finish layer becomes, the more glossy it becomes. Specifically, when powder with a Mohs hardness of less than 4 is exposed on the surface and polished, increasing the smoothness, the powder with a Mohs hardness of less than 4 will cause the surface to shine more. In this way, a finish layer with a glossy surface can be achieved.

[0041] The abrasive material can be any material capable of polishing powders, synthetic resins, and cement materials contained in the finishing layer, such as abrasive paper, waterproof abrasive paper, abrasive cloth, or grinding wheels, in which abrasive particles are coated with adhesive onto a base material such as paper.

[0042] Furthermore, the finishing layer can be polished using power tools such as electric sanders equipped with abrasive materials. Therefore, since skilled work by the operator is not required, anyone can easily achieve a glossy finish in a short amount of time.

[0043] The finish layer formed by applying the gloss coating material meets the hardness requirement of 7H or higher as specified in JIS K5600-5-4. Because the finish layer has a hardness of 7H or higher, it is resistant to scratches from dishes, writing instruments, etc. For this reason, it is particularly useful as a finish layer for tabletops and desks.

[0044] Alternatively, a primer coating material may be applied to the surface to be coated, allowed to harden (dry) to form a base layer, and then a gloss coating material may be applied as a topcoat to the surface of this base layer. The primer coating material is used to fill in any irregularities on the surface to be coated and make it smooth, and conventionally known primer coating materials, such as those using calcium carbonate or aluminum hydroxide as aggregate, can be used.

[0045] Furthermore, as mentioned above, it is also possible to add coloring pigments that exhibit various colors to the glossy coating material to form a finish layer of various colors.

[0046] Furthermore, various patterns can be created. For example, a glossy coating material can be applied in a way that creates an uneven surface. The unevenness can be created by troweling, or by rolling a roller with an uneven surface over the applied glossy coating material before it hardens (dries). After the glossy coating material hardens (dries) to form a finish layer with an uneven surface, the raised areas are polished to increase the smoothness, resulting in glossy surfaces on the raised areas and matte surfaces on the recessed areas. In this way, a finish layer with a pattern represented by glossy and matte areas is obtained.

[0047] Furthermore, a topcoat material may be applied to the surface of the finishing layer. By applying a colorless acrylic or urethane topcoat material, a coating layer can be formed, providing properties such as stain resistance, water resistance, and heat resistance. These functions allow the gloss of the finishing layer to be maintained over a long period of time.

[0048] <Tabletop> The tabletop is the surface of a table or desk, and has a finish layer formed on its surface using the glossy coating material described above. The finish layer has a scratch hardness of 7H or higher as specified in JIS K5600-5-4, making it resistant to scratches from dishes, writing instruments, etc., while also possessing a glossy finish and high aesthetic appeal. Furthermore, the tabletop may have a coating layer made of the topcoat material described above on top of the finish layer. The coating layer enhances stain resistance, water resistance, and heat resistance. As a result, the tabletop is protected even if hot liquids are spilled on it. Also, dirt that adheres to the coating layer can be easily removed, so the finish layer will maintain its gloss for a long period of time. [Examples]

[0049] Each coating material (Examples 1-11, Comparative Examples 1-2) was prepared as follows. The raw materials used are listed below. <Aggregates> • Silica sand (average particle size: 600 μm, Shinozawa Silica Sand Industry Co., Ltd.) • Silica sand (average particle size: 350 μm, Tokai Kiko Co., Ltd.) • Silica sand (average particle size: 100 μm, Shinozawa Silica Sand Industry Co., Ltd.) ·Kansuiseki (average particle size: 270 μm, product name: K-1 (1 rin), Sankyo Seifun Co., Ltd.) ·Talc (average particle size: 5μm, product name: CL-100, Tamura Nameshi Kogyo Co., Ltd.) • Calcium carbonate (average particle size: 5 μm, product name: #100, Sankyo Seifun Co., Ltd.) • Calcium carbonate (average particle size: 20 μm, Sankyo Seifun Co., Ltd.) • Calcium carbonate (average particle size: 65 μm, product name: G-100, Sankyo Seifun Co., Ltd.) • Aluminum hydroxide (average particle size: 18 μm, product name: B-316, Almorix Co., Ltd.) <Cement Materials> • White cement (Taiheiyo Cement Corporation) <Thickening agent> • Carrageenan (Product name: GENUVISCO carrageenan type JJ, Sansho Co., Ltd.) <Water repellent> • Aluminum stearate (Kawamura Chemical Industries Co., Ltd.) • Modified silane / siloxane (Product name: Sitren P750, SKW East Asia Co., Ltd.) <Curing retarder> • Citric acid (Fuso Chemical Industries Co., Ltd.) • Amino acid salts and peptide compounds (Product name: R-Base, Marusen Chemical Co., Ltd.) <Coloring pigments> SK Select Color (Product Name) (Shikoku Chemicals Building Materials Co., Ltd.) <Synthetic resin> • Acrylic emulsion (Product name: Polysol® AE-820, Resonaq Corporation)

[0050] Using the compositions shown in Tables 1-3, a thickener and coloring pigment were added to water, stirred to homogenize, and then aggregate, cement material, water repellent, curing retarder, and synthetic resin were added, stirred to homogenize, and the coating materials for Examples 1-11 and Comparative Examples 1-2 were prepared. The numbers in parentheses for each aggregate in Tables 1-3 represent the average particle size of each aggregate.

[0051] [Table 1]

[0052] [Table 2]

[0053] [Table 3]

[0054] Each coating material from Examples 1-11 and Comparative Examples 1-2 was applied to the surface of vertically positioned gypsum boards (product name: Tiger Board, Yoshino Gypsum Co., Ltd.) while pressing them down with a trowel.

[0055] After curing each coating to form its respective finish layer, the surface of the finish layer was polished using an electric sander equipped with a sanding disc. The polishing was carried out by changing the grit of the sandpaper in the following order: 240, 400, 1000, and 2000.

[0056] For each material, surface hardness, gloss, and application workability were evaluated using the following evaluation methods. The evaluation results are shown in Tables 4 and 5. • Evaluation of surface hardness (evaluation in accordance with JIS K5600-5-4) ○:Hardness 7H or higher ×: Hardness less than 7H • Evaluation of gloss ○: Has a high gloss after polishing. △: Slightly glossy after polishing ×: No shine after polishing. • Evaluation of application workability ○: The coating does not drip during application and comes off the trowel easily. △: No paint drips during application. ×: There is paint dripping during application.

[0057] [Table 4]

[0058] [Table 5]

[0059] Examples 1-4 and 8-11 all met the hardness requirement of 7H, and exhibited good gloss and workability. Examples 5 and 6 met the hardness requirement of 7H or higher and exhibited good gloss, but exhibited slightly inferior workability. Example 7 also met the hardness requirement of 7H or higher, but exhibited slightly inferior gloss and workability. On the other hand, Comparative Examples 1 and 2 exhibited good gloss and workability, but did not meet the hardness requirement of 7H.

Claims

1. A gloss coating material for a finishing layer, Aggregates making up 30-65% by weight, 10-40% by weight of cement material, 2 to 10% by weight of synthetic resin, It contains water, The aggregate comprises powder with a Mohs hardness greater than 6 and powder with a Mohs hardness less than 4, wherein the average particle size of the powder with a Mohs hardness greater than 6 is greater than the average particle size of the powder with a Mohs hardness less than 4. The aforementioned glossy coating material becomes glossy when polished after hardening. A glossy coating material characterized by the following features.

2. The powder having a Mohs hardness greater than 6 is silica sand, and the powder having a Mohs hardness less than 4 is one or more selected from the group consisting of talc, calcium carbonate, and aluminum hydroxide. The gloss coating material according to feature 1.

3. The ratio of the average particle sizes of powders with a Mohs hardness greater than 6 to powders with a Mohs hardness less than 4 is 1.4:1 to 600:

1. The gloss coating material according to feature 2.

4. The average particle size of the powder with a Mohs hardness greater than 6 is 100 to 600 μm, and the average particle size of the powder with a Mohs hardness less than 4 is 1 to 70 μm. The gloss coating material according to feature 3.

5. The mixing ratio of the powder having a Mohs hardness greater than 6 to the powder having a Mohs hardness less than 4 is 3:1 to 6:1 by weight. The gloss coating material according to feature 2.

6. The mixing ratio of the powder having a Mohs hardness greater than 6 to the powder having a Mohs hardness less than 4 is 3:1 to 6:1 by weight. The gloss coating material according to feature 4.

7. A glossy coating material for tabletops, Aggregates making up 30-65% by weight, 10-40% by weight of cement material, 2 to 10% by weight of synthetic resin, It contains water, The aggregate comprises powder with a Mohs hardness greater than 6 and powder with a Mohs hardness less than 4, wherein the average particle size of the powder with a Mohs hardness greater than 6 is greater than the average particle size of the powder with a Mohs hardness less than 4. A glossy coating material characterized by the following features.

8. A step of applying a gloss coating material according to any one of claims 1 to 7 while pressing it onto a surface to be coated, A step of polishing the surface of the finish layer formed by the hardening of the gloss coating material with an abrasive, Equipped with, A surface finishing method characterized by the following:

9. The polishing is performed using a sander to which the abrasive material is attached. The surface finishing method according to feature 8.

10. A tabletop having a finishing layer, The aforementioned finishing layer is It contains 30-65% by weight of aggregate, 10-40% by weight of cement material, 2-10% by weight of synthetic resin and water, wherein the aggregate includes powder with a Mohs hardness greater than 6 and powder with a Mohs hardness less than 4, and is formed by applying a glossy coating material in which the average particle size of the powder with a Mohs hardness greater than 6 is larger than the average particle size of the powder with a Mohs hardness less than 4, curing it, and then polishing it with an abrasive. The surface of the aforementioned finishing layer has a scratch hardness of 7H or higher as specified in JIS K5600-5-4. A tabletop characterized by the following features.

11. The finishing layer has a coating layer on top of the aforementioned finishing layer, The top plate according to feature 10.

12. A gloss coating material for a finishing layer, 30-70% by weight of aggregate, 10-40% by weight of cement material, 2 to 10% by weight of synthetic resin, It contains water, The aggregate comprises powder with a Mohs hardness greater than 6 and powder with a Mohs hardness less than 4, wherein the average particle size of the powder with a Mohs hardness greater than 6 is greater than the average particle size of the powder with a Mohs hardness less than 4. The aforementioned glossy coating material becomes glossy when polished after hardening. A glossy coating material characterized by the following features.

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