JP4895850B2 - Manufacturing method of decorative sheet - Google Patents

Description

  The present invention relates to a method for producing a decorative sheet.

In recent years, building interiors and exterior walls, etc. have attracted attention for the finishing with rich design such as brick tone, tile tone and natural stone tone.
There is a case where a decorative sheet is used as a material for such finishing. This decorative sheet is a building material in which a composition containing various colorants and a binder such as a synthetic resin is formed into a sheet shape, and various aesthetics can be achieved by adjusting the type and ratio of the colorants, the uneven shape of the surface, and the like. Sex can be expressed.

By the way, in recent years, in urban areas and the like, oily pollutants and the like are floating in the atmosphere due to exhaust gas from automobiles and the like. Even in the decorative sheet described above, these contaminants may adhere and accumulate on the surface of the sheet, which may impair aesthetics.
For such a problem, for example, by applying an antifouling treatment agent disclosed in Patent Document 1 to the sheet surface, it is possible to prevent adhesion of contaminants.
However, when the antifouling agent as in Patent Document 1 is applied to the decorative sheet, a phenomenon that the hue of the decorative sheet changes to black, that is, a so-called wet color may occur. Furthermore, interference unevenness in which a part of the film has a rainbow color may occur.
Thus, the antifouling agent as disclosed in Patent Document 1 has a problem that the hue and texture of the original decorative sheet are likely to be impaired.

WO99 / 54414

  The present invention has been made in view of the above-described problems, and an object thereof is to improve the stain resistance of the decorative sheet surface while maintaining the hue and texture of the decorative sheet.

  As a result of intensive studies, the inventor applied a specific antifouling agent, and further applied a base paint containing a synthetic resin and colored powder on the inner surface of the mold, and then demolded. It has been found that the above problems can be solved, and the present invention has been completed.

That is, the present invention has the following characteristics.
1. The mold agent contains (1) two or more organic resins that are substantially incompatible with each other and (2) silica sol having an average primary particle diameter of 1 to 200 nm in a solid content weight ratio of 100: 50 to 100: 500. the, so that the amount used is 0.1g ^{/ m 2} ~50g ^/ m 2 in solids first step of subjecting the coating on the inner surface of the mold,
Second step of applying a base paint containing a synthetic resin and colored powder on the coated surface obtained in the first step so that the amount used is 100 g / m ² or more in solid content. ,
A third step of demolding after the antifouling agent and base paint are cured,
A method for producing a decorative sheet, comprising:
2. The silica sol is a water-dispersible silica sol having a pH of 5.0 or more and less than 8.5. The manufacturing method of the decorative sheet as described in any one of Claims 1-3.

  In the production method of the present invention, a decorative sheet having excellent surface stain resistance can be produced while maintaining hue and texture.

  Hereinafter, the best mode for carrying out the present invention will be described.

The method for producing the decorative sheet of the present invention comprises:
(1) Amount used of an antifouling agent containing 100: 50 to 100: 500 of solid weight ratio of two or more organic resins that are substantially incompatible with each other and (2) silica sol having an average primary particle diameter of 1 to 200 nm. There as will be 0.1g ^{/ m 2} ~50g ^/ m 2 in solids first step of subjecting the coating on the inner surface of the mold,
Second step of applying a base paint containing a synthetic resin and colored powder on the coated surface obtained in the first step so that the amount used is 100 g / m ² or more in solid content. ,
A third step of demolding after the antifouling agent and base paint are cured,
It is characterized by including.

The material for the mold is not particularly limited, and known materials can be used.
For example, silicon rubber, polyurethane resin, epoxy resin, polyester resin and the like can be mentioned.
The mold used in the present invention preferably has an uneven pattern.
The mold having such a concavo-convex pattern finally forms the concavo-convex pattern of the decorative sheet. The degree of unevenness is not particularly limited, but the height is preferably about 0.5 to 30 mm (preferably about 1 to 20 mm). Moreover, it is preferable that the space | interval is about 0.5-30 mm (preferably about 1-20 mm).
For example, when silicon rubber is used, using a cosmetic building material having a concavo-convex pattern, the silicon rubber is poured onto the surface of the cosmetic building material, and after the silicon rubber is cured, the silicon rubber is peeled off from the surface of the cosmetic building material. Thus, a mold having a concavo-convex pattern can be easily produced.

In the production method of the present invention, as a first step, (1) two or more kinds of organic resins that are substantially incompatible with each other and (2) silica sol having an average primary particle diameter of 1 to 200 nm have a solid content weight ratio of 100. 100: the antifouling agent containing at 500, the amount used is such that the 0.1g ^{/ m 2} ~50g ^/ m 2 in solids and with the coating on the inner surface of the mold.

In the present invention, in particular, by using a mixture of two or more kinds of resins that are substantially incompatible with each other, it is possible to suppress the occurrence of bottom gloss, wet color, interference unevenness, etc. It is possible to maintain the texture.
In the present invention, “two or more types of resins that are substantially incompatible with each other” means that the formed film made of the resin mixture is translucent. As such a semi-transparent film, those having a concealment ratio of 0.08 to 0.90 (preferably 0.08 to 0.80, more preferably 0.10 to 0.60) are suitable. In addition, the concealment rate said here is a value measured according to JIS K5663 5.8 (however, a dry film thickness is 80 micrometers).

  As the resin component in the antifouling agent, in particular, the difference in refractive index is 0.01 or more (preferably 0.02 or more, more preferably 0.03 or more, more preferably 0.05 or more). It is desirable to include a resin. Using a plurality of resins having different refractive indexes in this way is advantageous in terms of maintaining the texture of the decorative sheet. The refractive index in the present invention is a value measured using an Abbe refractometer (light wavelength: 589 nm, measurement temperature: 20 ° C.).

Specifically, the resin component includes cellulose, polyvinyl alcohol, ethylene resin, polyester resin, epoxy resin, polyamine, polyol, polycarbonate, alkyd resin, melamine resin, vinyl chloride resin, vinyl acetate resin, acrylic resin, urethane resin, acrylic resin. Examples thereof include silicon resins, silicon resins, fluororesins, phenol resins, amino resins, polycarbonate resins, acrylic vinyl acetate resins, acrylic urethane resins, bio gums, galactomannan derivatives, alginic acid derivatives, and the like, or composite systems thereof. In the present invention, a combination satisfying the above-mentioned conditions is selected from these resins and used. In the present invention, a large number of three or more types of resins can be used, but it is desirable to use a combination of two types of resins in consideration of production efficiency and the like. The mixing ratio of the resin is not particularly limited as long as it satisfies the above-mentioned conditions, but when two kinds of resins are used, the solid content weight ratio is usually 98: 2 to 2:98, preferably 95: 5. ~ 5: 95.
In addition, as the resin component, a resin having crosslinking reactivity may be included. When a resin having crosslinking reactivity is used, water resistance, weather resistance, chemical resistance, and the like can be improved. Moreover, as a form of the resin component, a water-soluble resin and / or a water-dispersed resin (resin emulsion) is preferable. These resin components may be a one-component type or a multi-component type in which two or more components are mixed at the time of use.

(2) Silica sol in the antifouling agent is a component that contributes to improving antifouling properties by the action of polar groups such as silanol groups.
The average primary particle diameter of the silica sol is usually 1 to 200 nm, preferably 5 to 100 nm. Within this range, a plurality of silica sols having different average primary particle sizes can be used in combination. When the average primary particle diameter of the silica sol is larger than 200 nm, the specific surface area becomes small and silanol groups are reduced, so that the stain resistance is insufficient. When the average primary particle size is smaller than 1 nm, the silica sol itself becomes unstable, so that it is not practical. In addition, the average primary particle diameter said here is a value measured by the light-scattering method.

  As the silica sol, a water-dispersible silica sol having a pH of 5.0 or more and less than 8.5 (preferably 6.0 or more and 8.0 or less) is suitable. The silica sol prepared at such pH can exhibit an excellent antifouling effect due to abundant silanol groups on the particle surface. Moreover, the contamination inhibitor which hardly contains an organic solvent can be obtained by the combination of water-soluble resin and / or water-dispersible resin, and water-dispersible silica sol.

  Such a neutral type water-dispersible silica sol can be produced using a silicate compound as a raw material. Examples of the silicate compound include tetramethoxysilane, tetraethoxysilane, tetra n-propoxysilane, tetraisopropoxysilane, tetra n-butoxysilane, tetraisobutoxysilane, tetra sec-butoxysilane, tetra t-butoxysilane, tetra Examples thereof include phenoxysilane and the condensates thereof. In addition, alkoxysilane compounds other than the above silicate compounds, alcohols, glycols, glycol ethers, fluorine alcohols, silane coupling agents, polyoxyalkylene group-containing compounds, and the like can also be used. As the medium of the water-dispersible silica sol, water and / or a water-soluble solvent can be used. Examples of the water-soluble solvent include alcohols, glycols, glycol ethers and the like.

  The solid content weight ratio of the resin component and the silica sol in the contamination inhibitor is usually 100: 50 to 100: 500 (preferably 100: 80 to 100: 400, more preferably 100: 100 to 100: 300). Within such a range, excellent antifouling performance can be obtained. When there is too little silica in this solid content ratio, a sufficient effect cannot be obtained in terms of stain resistance. When there is too much silica, there exists a possibility that a silica may detach | desorb with time and a contamination | pollution resistant effect may be impaired. Moreover, it becomes easy to produce a crack in the decorative sheet surface.

Components other than the organic resin and silica sol can be appropriately mixed with the contamination inhibitor.
Examples of such components include coloring materials, thickeners, leveling agents, wetting agents, plasticizers, film-forming aids, antifreezing agents, pH adjusting agents, preservatives, antifungal agents, anti-algae agents, and antibacterial agents. Agents, dispersants, antifoaming agents, ultraviolet absorbers, antioxidants, catalysts, crosslinking agents and the like. The pH of the contamination inhibitor is desirably 5.0 to less than 8.5 (preferably 6.5 to 8.0) from the viewpoint of the stability of the contamination inhibitor.

  In the present invention, by mixing the coloring material, it is possible to obtain a decorative sheet excellent in aesthetics combined with the hue of the decorative sheet.

Examples of colorants include titanium oxide, zinc oxide, carbon black, ferric oxide, yellow iron oxide, ultramarine, cobalt green, and other inorganic color pigments, azo, naphthol, pyrazolone, and anthraquinone. Organic pigments such as perylene, quinacridone, disazo, isoindolinone, benzimidazole, phthalocyanine, quinophthalone, pearl pigments, fluorescent pigments, phosphorescent pigments, metallic pigments,
Acid Orange 7 (Orange II), Methyl Red and other acidic dyes,
Basic dyes such as Crystal Violet, Bismarck Brown G, Basic Blue 9 (Methylene Blue), mordant dyes such as alizarin and Modern Red 11,
Acid mordant dyes such as Eriochrome Black T, Modern Black 3,
Direct dyes such as Congolet and Direct Red 2,
Disperse dyes such as Disperse Red 73, Disperse Orange 3, Disperse Red 17, Disperse Violet 1
Sulfur dyes such as Sulfur Black B,
Vat red 1, Vat Blue 1 (Indigo) and other vat dyes,
Oxidation dyes such as aniline black,
Reactive dyes such as Reactive Red 24,
Food Blue 1 (Brilliant Blue; Brilliant Blue FCF), Food Blue 2 (Indigo Carmine), Food Red 2 (Amaramth), Food Red 3 (Erythrosine), Food Red 40 (Arla Red AC), Food Red 102 (New Coccine), Food Red 104 (Phloxine), Food Red 105 (Rose Bengal), Food Red 106 (Acid Red Acid Red), Food Green 3 (Fast Green FCF), Food Yellow 4 (Tartrazine), Food Yellow 5 (Sunset Yellow FCF; Sunset) Food dyes such as yellow FCF),
Safflower yellow dye, turmeric yellow dye, public orange orange dye, cochineal red dye, gardenia blue dye, gardenia green dye, β-carotene dye, anato orange dye, red cocoon red dye, Natural dyes such as lac red dye, grape skin red dye, beet red red dye, perilla red dye, berry red dye, chlorophyll green dye, cacao brown dye, colayan brown dye Nylamino) stilbene disulfonic acid derivatives, coumarin derivatives, pyrazoline derivatives, naphthalimide derivatives, bisbenzoxazolyl derivatives, bisstyryl biphenyl derivatives and other fluorescent dyes,
Azoic dyes,
Etc.

The coating film formed from the antifouling agent mixed with such a colorant is preferably one that exhibits transparency. By having transparency, it is combined with the hue of the base paint, etc., and is a cosmetic sheet that has excellent aesthetics. Can be obtained.
In order for the antifouling agent coating film to show transparency, the solid content weight ratio of the colorant is 100: 0.01 to 100: 30, preferably 100: 0.05 to 100: 25, in terms of organic resin: colorant. More preferably, it may be about 100: 0.1 to 100: 20. By being in such a range, the antifouling agent coating film has transparency, can obtain excellent aesthetics, and can maintain excellent antifouling performance.

  In the present invention, it is particularly preferable to apply a contamination inhibitor mixed with a colorant on the inner surface of a mold having an uneven pattern. In such a case, the antifouling agent coating film is applied in a state where the film thickness is continuously changed so that the film thickness of the antifouling agent is maximized in the concave portion of the mold and the film thickness is minimized in the convex portion. Can be formed. Therefore, the surface finally obtained by demolding can express deep aesthetics due to a change in hue due to a continuous change in the film thickness of the antifouling agent coating film.

The method for applying such a contamination inhibitor is not particularly limited, and a usual method can be used. For example, it can be applied using a pressure-feed spray gun or the like, can be applied using a flow coater or the like, or can be applied using a coating tool such as a brush, roller or spray. .
In addition, the contamination inhibitor is used in a solid content of 0.1 g / m ^{2 to} 50 g / m ² (preferably 0.2 g / m ^{2 to} 30 g / m ² , more preferably 0.5 g / m ^{2 to} 20 g. / M ² ). If the amount used is more than 50 g / m ² , the texture of the decorative sheet surface tends to be damaged.

Next, as a second step, the base paint containing the synthetic resin and the colored powder particles is applied to the coated surface obtained in the first step so that the amount used is 100 g / m ² or more in solid content. Apply on top. The application timing may be before or after the antifouling agent is cured.

The synthetic resin is not particularly limited, and those that can be normally used can be used. For example, ethylene resin, vinyl acetate resin, polyester resin, alkyd resin, vinyl chloride resin, epoxy resin, acrylic resin, urethane resin, phenol resin, melamine resin, amino resin, polycarbonate resin, acrylic silicon resin, acrylic vinyl acetate resin, acrylic Examples thereof include water-soluble resins such as urethane resins, silicon resins, and fluorine resins, water-dispersed resins, and combinations thereof, and one or more of them can be used.
In the present invention, in particular, an acrylic resin, a urethane resin, an acrylic silicon resin, or the like is preferably used.

  Examples of the colored powder particles include inorganic oxides such as titanium oxide, zinc oxide, carbon black, ferric oxide (bengal), lead chromate (molybdate orange), yellow lead, yellow iron oxide, ultramarine, and cobalt green. Colored pigments, azo, naphthol, pyrazolone, anthraquinone, perylene, quinacridone, disazo, isoindolinone, benzimidazole, phthalocyanine, quinophthalone, and other organic color pigments, pearl pigments, fluorescent pigments , Phosphorescent pigments, metallic pigments, silica sand, crushed stone, cold sand stone, river sand, mountain sand, marble ground, granite ground, obsidian ground, limestone ground, ceramic ground, glass beads, glass ground, resin beads, porous Resin beads, metal particles, silica gel, zeolite, alumina, allophane, diatomaceous earth, siliceous shale, sepiorai , Attabargite, montmorillonite, zonolite, imogolite, shell powder, Otani stone powder, activated clay, charcoal, activated carbon, wood powder, etc., or those treated with pigments, dyes, glazes, etc., heavy Examples include calcium carbonate, aluminum hydroxide, clay, kaolin, talc, precipitated barium sulfate, barium carbonate, white carbon, diatomaceous earth, and glittering powder.

  The volume concentration of the colored powder particles in the base paint is preferably 0.01% to 90% (more preferably 0.05% to 85%, more preferably 0.1% to 80%). When the color powder volume concentration of the base paint is larger than 90%, the strength of the decorative sheet may be adversely affected.

  In addition, for the base paint, film forming aids, water repellents, plasticizers, antiseptics, antifungal agents, antialgae agents, antifoaming agents, leveling agents, pigment dispersants, antisettling agents, dripping You may contain additives for coating materials, such as an inhibitor, a matting agent, a ultraviolet absorber, and a fiber.

The base paint used in the present invention may be applied before or after the antifouling agent is cured, but if applied before the antifouling agent is cured, pinholes in the base paint are suppressed. Can be preferable.
Also, if applied before the anti-staining agent is cured, the colored powder contained in the base paint gradually penetrates into the anti-staining agent and cures when the colored powder penetrates to some extent. Therefore, the manufactured decorative sheet has a deep and excellent aesthetic appearance depending on the degree of penetration of the colored powder particles. Furthermore, when a coloring material is contained in the contamination inhibitor, the coloring material gradually permeates into the base coating material, and thus has a deep and excellent aesthetic appearance.
Usually, it is preferably about 0 to 180 minutes (preferably 0.5 to 120 minutes) after applying the antifouling agent.
The method for applying such a base paint is not particularly limited, and a usual method can be used. For example, it can be applied using a pressure-feed spray gun or the like, or can be applied using a flow coater or the like, or can be applied using a brush, roller, spray, trowel, or other coating tool. You can also.
In addition, the base paint can be applied after the colored powder or the like is sprayed on the antifouling agent.

The amount of the base coating composition, on a solids 100 g / ^{m 2} or more, preferably ^{100g / m 2 ~10000g / m 2} , more preferably may be coated with such a 200g ^{/ m 2} ~6000g ^/ m 2 about . Moreover, in this invention, 2 or more types of base coating materials can also be used.

After the base paint is cured, it is demolded to obtain the decorative sheet of the present invention. Curing of the base paint and the antifouling agent may be performed by natural drying, or may be forcibly cured by applying heat or the like.
In the manufacturing method using such a mold, a decorative sheet having the outermost surface of the antifouling agent is obtained. According to the production method of the present invention, problems such as paint dripping, coating unevenness, and pinholes are less likely to occur compared to a wet method, etc., and excellent aesthetics can be easily achieved without requiring skill. Can get to. In addition, the uneven pattern of the formwork expresses a design feeling due to the unevenness, but it also acts on the matting effect of the antifouling agent, and a deeper aesthetics can be obtained.
In addition, a reinforcing layer can be provided on the base coating film side of the decorative sheet of the present invention for the purpose of reinforcement, smoothing and the like.

  The decorative sheet obtained in this way is applied by attaching it to the wall surface, pillar, etc. of a building such as a detached house, apartment house, store, or various public facilities via an adhesive or adhesive. . It does not specifically limit as an adhesive agent and an adhesive, A general purpose thing can be used. An adhesive tape or the like can also be used.

<Preparation of antifouling agent>
(Anti-pollution agent A)
Urethane resin emulsion (solid content 30% by weight, refractive index 1.441) and acrylic resin emulsion (solid content 50% by weight, refractive index 1.492) were mixed so that the solid content weight ratio was 58:42. . The concealment ratio of this resin mixture was 0.11 (dry film thickness 80 μm). Next, this resin mixture and a water-dispersible silica sol (pH 7.6, solid content 20% by weight, average primary particle size 27 nm) are mixed so that the solid content weight ratio is 100: 125, and water is added thereto to form a solid. Antifouling agent A having a content of 2% by weight and a pH of 7.1 was prepared.

(Contamination inhibitor B)
Acrylic resin emulsion (solid content 50 wt%, refractive index 1.492) and water-dispersible silica sol (pH 7.6, solid content 20 wt%, average primary particle size 27 nm) so that the solid content weight ratio is 100: 125. Then, water was added thereto to prepare a contamination inhibitor B having a solid content of 2% by weight and a pH of 7.2. In addition, the concealment rate of the acrylic resin emulsion used for the contamination inhibitor B was 0.05 (dry film thickness 80 μm).

(Contamination inhibitor C)
Urethane resin emulsion (solid content 30% by weight, refractive index 1.441) and acrylic resin emulsion (solid content 50% by weight, refractive index 1.492) were mixed so that the solid content weight ratio was 58:42. . The concealment ratio of this resin mixture was 0.11 (dry film thickness 80 μm). Next, the resin mixture, water-dispersible silica sol (pH 7.6, solid content 20% by weight, average primary particle size 27 nm), and pigment dispersion (titanium oxide: carbon black = 5: 1 (weight ratio)) The mixture was mixed at a weight ratio of 100: 125: 0.4, and water was added thereto to prepare a contamination inhibitor C having a solid content of 2% by weight and a pH of 7.1.

<Preparation of base paint>
(Base paint A)
100 parts by weight of acrylic styrene resin emulsion (solid content 50% by weight), 3.6 parts by weight of titanium oxide, 0.3 part by weight of carbon black, 0.6 part by weight of phthalocyanine blue, 10 parts by weight of calcium carbonate, 20 parts by weight of chilled stone Part, 30 parts by weight of aluminum hydroxide, 3 parts by weight of water and 3 parts by weight of additive were mixed to prepare a base paint A having a viscosity of 10 Pa · s, a volume concentration of colored powder particles of 30% and a solid content of 70%.
The viscosity is a value measured at a temperature of 23 ° C. using a BH viscometer (rotation speed: 20 rpm).

(Base paint B)
Mixing 100 parts by weight of acrylic styrene resin emulsion (solid content 50% by weight), 500 parts by weight of colored silica sand, 10 parts by weight of calcium carbonate, 200 parts by weight of water and 3 parts by weight of additive, viscosity 10 Pa · s, colored powder Base paint B having a volume concentration of 81% and a solid content of 70% was prepared.

(Test Example 1)
On a mold having a sandstone-like pattern, 5 g / m ^{2 of} anti-staining agent A is applied in a solid content at a temperature of 23 ° C., and after 1 minute, base paint A is applied in a solid content of 1500 g / m ² . After 24 hours, the mold was removed to obtain a sandstone-like decorative sheet.
The obtained decorative sheet had a deep color tone and luster with a sense of unevenness, and had an aesthetic appearance with a calm texture.
Next, this decorative sheet was exposed outdoors at an angle of 45 degrees southward in Ibaraki City, Osaka Prefecture, and the appearance after 3 months was confirmed. As a result, the decorative sheet surface had a deep color tone and gloss and maintained a calm texture.

(Test Example 2)
A sandstone-like decorative sheet was obtained in the same manner as in Example 1 except that the base paint B was used in place of the base paint A.
The obtained decorative sheet had a deep color tone and luster with a sense of unevenness, and had an aesthetic appearance with a calm texture.
Next, this decorative sheet was exposed outdoors at an angle of 45 degrees southward in Ibaraki City, Osaka Prefecture, and the appearance after 3 months was confirmed. As a result, the decorative sheet surface had a deep color tone and gloss and maintained a calm texture.

(Test Example 3)
A sandstone-like decorative sheet was obtained in the same manner as in Example 1 except that the pollution inhibitor B was used in place of the pollution inhibitor A.
The obtained decorative sheet had a sandstone-like pattern with a sense of unevenness, but a deep color tone and gloss on the surface of the decorative sheet and a calm texture were not obtained.

(Test Example 4)
The base paint A was applied in a solid content of 1500 g / m ² on a mold having a sandstone-like pattern at a temperature of 23 ° C., and after 24 hours, it was demolded to obtain a sandstone-like decorative sheet. .
The resulting decorative sheet exhibited an aesthetic appearance of a sandstone-like pattern with a sense of unevenness.
Next, this decorative sheet was exposed outdoors at an angle of 45 degrees southward in Ibaraki City, Osaka Prefecture, and the appearance after 3 months was confirmed. As a result, the surface of the decorative sheet was conspicuous.

(Test Example 5)
A sandstone-like decorative sheet was obtained in the same manner as in Example 1 except that the pollution inhibitor C was used in place of the pollution inhibitor A.
The obtained decorative sheet had a sense of unevenness, and combined with the color tone of the contamination inhibitor C, had a deep color tone and gloss, and had an aesthetic appearance with a calm texture.
Next, this decorative sheet was exposed outdoors at an angle of 45 degrees southward in Ibaraki City, Osaka Prefecture, and the appearance after 3 months was confirmed. As a result, the decorative sheet surface had a deep color tone and gloss and maintained a calm texture.

Claims (2)

(1) Amount used of an antifouling agent containing 100: 50 to 100: 500 of solid weight ratio of two or more organic resins that are substantially incompatible with each other and (2) silica sol having an average primary particle diameter of 1 to 200 nm. There as will be 0.1g ^{/ m 2} ~50g ^/ m 2 in solids first step of subjecting the coating on the inner surface of the mold,
Second step of applying a base paint containing a synthetic resin and colored powder on the coated surface obtained in the first step so that the amount used is 100 g / m ² or more in solid content. ,
A third step of demolding after the antifouling agent and base paint are cured,
A method for producing a decorative sheet, comprising: The method for producing a decorative sheet according to claim 1, wherein the silica sol is a water-dispersible silica sol having a pH of 5.0 or more and less than 8.5.