JP2021074646A - Coated substrate manufacturing method - Google Patents

Abstract

To provide a coated substrate manufacturing method which can inhibit liquid from dripping when applied to a vertical surface, and can form a coated substrate excellent in transparency.SOLUTION: A coated substrate manufacturing method comprises: coating a surface of a substrate with an aqueous solution containing amorphous silica and alkali metal silicate; and drying the applied aqueous solution to form an alkali metal silicate layer. The B-type viscosity μ6 of the aqueous solution under the condition of 6 rpm and 20°C is 1500 mPa s or more.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for producing a coated substrate.

Conventionally, it has been known to apply an aqueous alkali metal silicate solution to the surface of a base material to form an alkali metal silicate layer in order to impart fire protection performance to the base material.

Japanese Unexamined Patent Publication No. 2005-36355

When the alkali metal silicate aqueous solution is applied to an inclined surface such as the vertical surface of the base material, dripping of the alkali metal silicate aqueous solution occurs, and the thick alkali metal silicate metal salt layer must be repeatedly applied / dried. Is often difficult to form. Therefore, there is room for improvement in the conventional method in terms of preventing dripping.

Further, in the conventional method, since the alkali metal silicate layer formed has low transparency, it is difficult to visually recognize the pattern such as the grain of wood on the surface of the base material from the outside.

The present invention has been made in view of the above problems, and is a method for producing a coated base material, which can suppress dripping when applied to an inclined surface such as a vertical surface, and the obtained coated base material has excellent transparency. The purpose is to provide.

The method for producing a coated base material according to the present invention includes a step of applying an aqueous solution containing amorphous silica and an alkali metal silicate on the surface of the base material, and drying the applied aqueous solution to form an alkali metal silicate layer. _{The B-type viscosity μ 6 under} the conditions of 6 rpm and 20 ° C. of the aqueous solution is 1500 mPa · s or more.

According to the present invention, since the B-type viscosity μ _{6 of} the aqueous solution under the conditions of 6 rpm and 20 ° C. is 1500 mPa · s or more, it is possible to suppress dripping when applied to an inclined surface such as a vertical surface. Therefore, a thick alkali silicate metal salt layer can be formed without repeating coating / drying many times. In addition, the uniformity of the thickness of the alkali metal silicate layer can be increased. Further, the formed alkali metal silicate layer is excellent in transparency.

Further, when the B-type viscosity of the aqueous solution under the conditions of 60 rpm and 20 ° C. is μ ₆₀ , μ ₆ / μ ₆₀ may be 3 or more. When the aqueous solution is applied while suppressing dripping _{, the B-type viscosity μ 6 under} the conditions of 6 rpm and 20 ° C. is 1500 mPa · s or more and μ ₆ / μ _{60 is 3 or more.} The elongation of the aqueous solution of is excellent. Then, the elongation of the aqueous solution becomes excellent, so that the obtained coating base material has excellent surface smoothness.

Further, the base material can be a flammable base material.

Further, the alkali metal silicate may contain sodium silicate.

When the alkali metal silicate contains sodium silicate, the alkali metal silicate may further contain lithium silicate.

When the alkali metal silicate contains sodium silicate and lithium silicate, the mass ratio of the mass of the lithium silicate contained in the alkali metal silicate to the mass of the sodium silicate contained in the alkali metal silicate is 0. It may be 01 to 1.5.

Further, the content of the amorphous silica contained in the aqueous solution may be 3.0 to 160% by mass with respect to the total amount of the alkali metal silicate.

According to the present invention, there is provided a method for producing a coated base material, which can suppress dripping when applied to an inclined surface such as a vertical surface, and the obtained coated base material has excellent transparency.

FIG. 1 is a schematic cross-sectional view of a method for manufacturing a coated base material according to the first embodiment. FIG. 2 is a schematic cross-sectional view of the method for manufacturing a coated base material according to the second embodiment. FIG. 3 is a schematic cross-sectional view of the method for producing a coated base material according to the third embodiment.

Hereinafter, preferred embodiments of the present invention will be described. However, the present invention is not limited to the following embodiments.

(Manufacturing method of coating base material)
[First Embodiment]
A method for producing the coated base material 100 according to the first embodiment of the present invention will be described with reference to FIG.

(Preparation of base material)
First, as shown in FIG. 1A, the base material main body 10 is prepared. The base material body 10 may be a flammable base material or a non-flammable base material.

Examples of flammable substrates include wood-based materials, lumber products, plywood, LVL (Laminated Veneer Lumber), laminated lumber, CLT (Cross Laminated Timmer), structural panels (oriented strand boards (OSB)), particle boards, etc. It is a wood material such as fiber board.

Other examples of flammable substrates include polyethylene, polypropylene, polystyrene, polyvinyl chloride, ABS, polycarbonate, methyl acrylate, polymethyl methacrylate, polyurethane, natural rubber, chloroprene rubber, EPDM, fluororesin, polyester, melamine, It is a resin material such as polyamide, which can be in bulk, foam or other form.

Examples of nonflammable substrates are concrete, mortar, cement, plaster, stone, metal, glass, ceramic and the like.

The thickness of the base material body 10 is not particularly limited. For example, it can be 3 μm to 3.5 m.

Subsequently, as shown in FIG. 1B, a primer layer 20 is formed on the surface of the base material main body 10 by a known method to obtain a base material 25.

The primer layer 20 is a layer that improves the adhesion between the base material body 10 and the alkali metal silicate layer 30, but is not essential. The primer layer 20 can be, for example, an adhesive resin such as a modified epoxy resin or urethane resin. It is also possible to use an inorganic material such as silica or alumina as the primer layer. Such a primer layer can be formed by applying the raw material of the primer layer to the surface of the base material main body 10.

The thickness of the primer layer 20 is not limited, but from the viewpoint of enhancing transparency, it is ^{preferably 150 μm or less (corresponding to a coating amount of 500 g / m 2} or less), more preferably 90 μm or less ( ^{corresponding to a coating amount of 300 g / m 2} or less). Therefore, from the viewpoint of obtaining the adhesiveness improving effect and the sealing effect, ^{it is preferable that the thickness is 15 μm or more (corresponding to a coating amount of 50 g / m 2} or more), and 30 μm or more ( ^{corresponding to a coating amount of 100 g / m 2} or more). Is more preferable.

In the present embodiment, the surface of the base material 25 (base material body 10) is inclined by 90 ° with respect to the horizontal plane.

Subsequently, as shown in FIG. 1 (c), an aqueous solution containing amorphous silica and an alkali metal silicate (hereinafter, also referred to as “aqueous solution”) is applied to the surface of the base material 25 to form an aqueous solution layer 30a. Form. _{The B-type viscosity μ 6} of the aqueous solution to be applied under the conditions of 6 rpm and 20 ° C. is 1500 mPa · s or more.

Here, the aqueous solution will be described in detail.
<Alkali metal silicate>
The alkali metal silicate is represented by _{M 2} O · nSiO _2. Here, M is Na, K, Li, or any combination thereof. n is _{a molar ratio indicating the number of moles of SiO 2} with respect to the number of moles of _{M 2} O. In the case of Na, it is 2.0 to 3.8, and in the case of Li, it is 3.5 to 7.5, K. In the case of, it can be 1.8 (No. 1 potassium silicate) to 3.7 (No. 2 potassium silicate). Further, n can be preferably 2.0 to 3.3 in the case of Na.

Among them, the alkali metal silicate preferably contains Na in M, that is, sodium silicate.

As the sodium silicate, water glasses No. 1 to No. 3 specified in JIS K1408, which is an aqueous solution of sodium silicate, can be preferably used. Further, in water glass Nos. 1 to 3, n is 2.0 to 3.3, but water glass having n of 2.0 to 3.8 can also be preferably used.

The content of the total alkali metal silicate contained in the aqueous solution is preferably 10 to 90% by mass and more preferably 20 to 80% by mass with respect to the total amount of the aqueous solution from the viewpoint of imparting fire protection performance. It is preferably 25 to 70% by mass, more preferably 25 to 70% by mass.

The mass ratio of sodium silicate to the total alkali metal silicate is preferably 40% by mass or more, more preferably 50% by mass or more, and more preferably 60% by mass, from the viewpoint of improving film forming property and imparting fire protection performance. It is more preferably mass% or more.

The alkali metal silicate preferably contains lithium silicate in addition to sodium silicate from the viewpoint of improving water resistance.

When the alkali metal silicate contains lithium silicate, the mass ratio of the mass of lithium silicate to the mass of sodium silicate is preferably 0.01 to 1.5 from the viewpoint of enhancing gloss and improving water resistance. It is more preferably 0.2 to 1.4, and even more preferably 0.3 to 1.2.

<Amorphous silica>
The amorphous silica may be fused silica glass or synthetic silica glass. The fused silica glass may be produced by electromelting or flame melting. The synthetic silica glass may be dry silica or wet silica.

The particle size of the amorphous silica is preferably 1 to 15 μm from the viewpoint of enhancing transparency. The particle size of amorphous silica refers to D50 of the volume-based particle size distribution in the laser diffraction type particle size distribution measurement.

The specific surface area of the amorphous silica may be ^{6 to 500 m 2 / g from the viewpoint of imparting viscosity.}

The pH of the 5% by mass aqueous solution of amorphous silica may be 4-7.

The oil absorption of amorphous silica (ISO 787-5) may be 100 to 500 g / 100 g.

The content of amorphous silica contained in the aqueous solution may be adjusted so that _{the B-type viscosity μ 6 of the aqueous solution satisfies the above requirements.} Increasing the amount of amorphous silica increases the B-type viscosity μ ₆ of the aqueous solution, and decreasing the amount of amorphous silica decreases the B-type viscosity μ _{6 of the} aqueous solution. The suitable amount of amorphous silica added differs depending on the type of amorphous silica, but the content of amorphous silica contained in the aqueous solution is, for example, 3.0 to 3.0 to the total amount of alkali metal silicate. It may be 160% by mass, and may be 6.8 to 90% by mass.

_{As described above, the B-type viscosity μ 6} of the aqueous solution under the conditions of 6 rpm and 20 ° C. is 1500 mPa · s or more, but from the viewpoint of further suppressing dripping when applied to an inclined surface such as a vertical surface. It is preferably 3000 mPa · s or more, and more preferably 4500 mPa · s or more. _{The B-type viscosity μ 6} of the aqueous solution under the conditions of 6 rpm and 20 ° C. may be 100,000 mPa · s or less.

The B-type viscosity is measured using a B-type viscometer (single cylindrical rotational viscometer). The measurement can be performed with reference to JIS K7117-1.

In order to improve the elongation of the aqueous solution when applying the aqueous solution, when the B-type viscosity of the aqueous solution under the conditions of 60 rpm and 20 ° C. is set to μ ₆₀ , μ ₆ / μ ₆₀ is preferably 3 or more. It is preferably 4 or more, and more preferably 5 or more. μ ₆ / μ ₆₀ may be 20 or less.

₆₀ a B-type viscosity at the conditions of 60 rpm, 20 ° C. of an aqueous solution _μ can be adjusted by the proportion of water such as an aqueous solution.

The amount of the aqueous solution applied can be adjusted as appropriate. For example, it can be 100 g / m ² or more, and can be 3000 g / m ² or less.

Subsequently, as shown in FIG. 1D, a sheet-like fiber such as a woven fabric 35 is attached onto the aqueous solution layer 30a before drying. Since the aqueous solution has a high viscosity, it is possible to temporarily fix the sheet-shaped fiber on the surface of the base material 25 simply by pasting it.

<Sheet-shaped fiber>
Examples of sheet-like fibers are woven fabrics (plain weave, etc.) and non-woven fabrics. In FIG. 1, a woven fabric 35 is illustrated as an example of sheet-shaped fibers. The woven fabric 35 has warp threads and weft threads.

Examples of fiber materials include glass fibers; carbon fibers; ceramic fibers such as alumina fibers and silica fibers; resin fibers such as aramid fibers and polypropylene fibers; metal fibers such as carbon steel fibers, stainless fibers and plated steel fibers. Be done.

In particular, a glass fiber woven fabric (glass cloth) and a non-woven fabric (glass mat, etc.) are sheet-shaped fibers that are particularly suitable in the present embodiment.

The thickness of the sheet-shaped fiber can be 0.003 to 2 mm.

When the sheet-shaped fiber is a woven fabric or a non-woven fabric of glass fiber, the weight of the sheet-shaped fiber per unit area can be 1 to ^{1000 g / m 2.}

Subsequently, as shown in FIG. 1 (e), the above-mentioned aqueous solution is further applied onto the fiber sheet (for example, woven fabric 35) to increase the thickness of the aqueous solution layer 30a. The amount of the aqueous solution applied the second time can be adjusted as appropriate, and the suitable range is the same as that of the first time. If necessary, attachment of another sheet-like fiber (for example, woven fabric 35) to the aqueous solution layer 30a and application of a further aqueous solution may be repeated.

The total coating amount of the aqueous solution layer 30a, for example, 100 g / ^{m 2} or more, 300 g / ^{m 2} or more, can be a 500 g / ^{m 2} or more, 3000 g / ^{m 2} or less, 2000 g / ^{m 2} or less, 1500 g / ^{m 2} It can be as follows.

The total thickness of the aqueous solution layer 30a formed by the plurality of coatings can be, for example, 30 to 900 μm.

Next, the aqueous solution layer 30a is dried to obtain a solid alkali metal silicate layer 30. The drying can be performed by natural drying, hot air drying, or the like.

It is preferable that the sheet-like fiber is completely embedded in the alkali metal silicate layer 30, but a part of the sheet-like fiber may protrude from the alkali metal silicate layer 30.

(Alkali metal silicate layer)
The obtained alkali metal silicate layer 30 contains sheet-like fibers, alkali metal silicate, and amorphous silica.

The thickness of the alkali metal silicate layer 30 can be 30 μm or more, preferably 90 μm or more, more preferably 150 μm or more, from the viewpoint of imparting fire protection performance. The thickness can be 900 μm or less, preferably 600 μm or less, and more preferably 450 μm or less from the viewpoint of transparency and workability.

The weight of the alkali metal silicate per unit area of the alkali metal silicate layer 30 is a dry weight of 50 g / m ² or more (corresponding to an aqueous solution coating amount of 100 g / m ² or more), preferably a dry weight, from the viewpoint of imparting fire protection performance. It can be 150 g / m ² or more (corresponding to an aqueous solution coating amount of 300 g / m ² or more), more preferably a dry weight of 250 g / m ² or more (corresponding to an aqueous solution coating amount of 500 g / m ² or more). From the viewpoint of transparency and workability, the weight is 1500 g / m ² or less in dry weight (corresponding to 3000 g / m ² or less in aqueous solution coating amount), preferably 1000 g / m ^{2 or less in dry weight (2000 g / m 2} or less in aqueous solution coating amount). Equivalent), more preferably a dry weight of 750 g / m ² or less (corresponding to an aqueous solution coating amount of 1500 g / m ² or less).

Next, the top layer 40 is formed on the alkali metal silicate layer 30 by a known method as shown in FIG. 1 (f).

(Top layer)
The top layer is a layer for protecting the alkali metal silicate layer 30 from water and the like. Examples of the material of the top layer 40 include alkyd resin, acrylic resin, urethane resin, acrylic silicon resin, fluororesin, silicone resin, epoxy resin, vinylidene chloride copolymer resin, vinyl chloride resin and the like (water-based or solvent-based). ). The top layer 40 can be laminated by applying the film-forming material of the top layer as a coating liquid or by laminating the film as a film formed in advance via an adhesive or the like. As a result, the coating base material 100 is completed. In addition, this embodiment can be carried out without forming the top layer 40.

According to the manufacturing method according to the present embodiment _{, since an aqueous solution having a B-type viscosity μ 6} of 1500 mPa · s or more under the conditions of 6 rpm and 20 ° C. is applied onto the base material 25, the base material 25 is oriented in the horizontal direction. Even when the surface of the base material is inclined, such as when it is erected vertically, it is possible to suppress dripping of the aqueous solution. Therefore, a thick alkali silicate metal salt layer can be formed without repeating coating / drying many times. In addition, the uniformity of the thickness of the alkali metal silicate layer can be increased.

Further, since the formed alkali metal silicate layer is excellent in transparency, it is preferable that the pattern (wood grain, etc.) on the surface of the base material body such as a wood material can be visually recognized from the outside.

Further, when μ ₆ / μ ₆₀ is 3 or more, the elongation of the aqueous solution at the time of applying the aqueous solution is ensured while preventing dripping, and the coating workability is improved. By ensuring the elongation of the aqueous solution, the obtained coating base material has excellent surface smoothness.

[Second Embodiment]
A method for producing the coated base material 100 according to the second embodiment of the present invention will be described with reference to FIG.

First, as shown in (a) of FIG. 2 and (b) of FIG. 2, the base material main body 10 is prepared in the same manner as the manufacturing method of the covering base material 100 according to the first embodiment, and the base material main body 10 A primer layer 20 is formed on the surface of the above by a known method to obtain a base material 25.

Subsequently, as shown in FIG. 2C, sheet-shaped fibers (for example, woven fabric 35) are temporarily fixed on the surface of the base material 25. The method of temporary fixing is not particularly limited, and for example, mechanical fixing by staples, pins, screws or the like, fixing by an adhesive or the like can be used.

Subsequently, as shown in FIG. 2D, the above-mentioned aqueous solution is applied to the sheet-shaped fibers (for example, woven fabric 35) on the base material 25 to obtain the sheet-shaped fibers (for example, woven fabric 35). The above-mentioned aqueous solution layer 30a embedded is formed. The coating amount and thickness of the aqueous solution can be the same as in the first embodiment.

Then, the aqueous solution layer 30a is dried to obtain a solid alkali metal silicate layer 30 in which sheet-shaped fibers (for example, woven fabric 35) are embedded. The thickness of the alkali metal silicate layer 30 can be the same as that of the first embodiment. After that, the top layer 40 can be formed on the alkali metal silicate layer 30 in the same manner as in the first embodiment.

[Third Embodiment]
A method for producing the coated base material 100 according to the third embodiment of the present invention will be described with reference to FIG.

First, as shown in (a) of FIG. 3 and (b) of FIG. 3, the base material main body 10 is prepared in the same manner as the manufacturing method of the covering base material 100 according to the first embodiment, and the base material main body 10 A primer layer 20 is formed on the surface of the above by a known method to obtain a base material 25.

Subsequently, as shown in FIG. 3C, an aqueous solution is applied onto the base material 25 to form an aqueous solution layer 30a. The amount of the aqueous solution applied can be the same as in the second embodiment. In this embodiment, the sheet-like fibers are not arranged on the base material 25. Instead, the fibers are dispersed in advance with respect to the aqueous solution.

(Dispersed fiber)
Examples of fiber materials are the same as in the first embodiment. Suitable fiber diameters are 0.003 to 1 mm and suitable fiber lengths are 0.1 to 100 mm. The amount of fibers in the aqueous solution can be 0.1 to 20% by weight based on the total amount of the aqueous solution. The fiber may be a long fiber or a short fiber, but is preferably a short fiber from the viewpoint of improving the kneadability of the aqueous solution. Short fibers are fibers of 50 mm or less. The length of the short fibers is preferably 15 mm or less, and may be 10 mm or less.

Then, as shown in FIG. 3 (d), the aqueous solution layer 30a was dried to obtain the alkali metal silicate layer 30, and then the alkali metal silicate was obtained by a known method as shown in FIG. 3 (e). The top layer 40 is formed on the layer 30.

The covering base material 100 obtained by each of the above-mentioned manufacturing methods can have fireproof performance, and for example, a building structure such as a pillar, a beam, a floor, a wall, a roofing material, a ceiling material, an inner wall material, and an exterior material. , Stairs, fittings and other building finishing materials, as well as interior materials for automobiles, railroads, ships, etc., and furniture materials.

In this embodiment, general flame retardants such as phosphorus-based, phosphazen-based, nitrogen-based, bromine-based, and inorganic-based (magnesium hydroxide, aluminum hydroxide, etc.) are added to the aqueous solution. I do not deny the matter.

The present invention is not limited to the above embodiment, and various modifications can be taken.
For example, in the above manufacturing method, the surface of the base material 25 (base material body 10) is inclined by 90 ° with respect to the horizontal plane, but it may be inclined with respect to the horizontal plane or parallel to the horizontal plane. There may be. It is preferable that the surface of the base material 25 is inclined by 10 to 90 ° with respect to the horizontal plane, and it is more preferable that the surface of the base material 25 is inclined by 25 to 90 °.

Further, in the above-mentioned production method, the base material 25 including the primer layer 20 is used, but the primer layer 20 is not essential. The alkali metal silicate layer 30 may be formed on at least a part of the surface of the base material 25. In the manufacturing method described above, the top layer 40 is provided, but the top layer 40 is not essential.

Further, in the third embodiment, the above-mentioned aqueous solution can be carried out even if it does not contain dispersed fibers.

[Adjustment of aqueous solution]
(Examples 1 to 11 and Comparative Example 1)
Aqueous solution of sodium silicate (water glass No. 3: n = 3.1 to 3.3, sodium silicate concentration: 38.5 to 40.0% by mass) and an aqueous solution of lithium silicate (trade name: lithium silicate 45, SiO ₂ / Li _2). Omolar ratio 4.5, sodium silicate concentration: 22% by mass) was mixed so that the mass ratio of the sodium silicate aqueous solution and the lithium silicate aqueous solution was 2: 1 of the sodium silicate aqueous solution: lithium silicate aqueous solution = 2: 1 to obtain a mixed solution. It was.
Further, with respect to 100 parts by mass of the mixed solution, amorphous silica (trade name: ACMATT TS-100, manufactured by Degusa AG, dry silica, specific surface area 250 m ² / g, average particle size 9.5 μm, 5% aqueous dispersion) The pH of 6.5 and the oil absorption amount (380 g / 100 g) were added in the amounts shown in Table 1 and stirred at a stirring speed of 600 to 800 rpm for 30 minutes to prepare an aqueous solution. Table 1 shows the concentration of amorphous silica in the aqueous solution. The content of sodium silicate contained in the aqueous solution was 25.6% by mass, and the content of lithium silicate was 7.3% by mass. The mass ratio of the mass of lithium silicate to the mass of sodium silicate was 0.3. Table 1 shows the content (mass%) of amorphous silica with respect to the total amount of alkali metal silicate.

(Examples 12 and 13 and Comparative Examples 3 to 5)
Amorphous silica (trade name: F-205, manufactured by Fumitech Co., Ltd., fused silica, particle size 5.5 μm, specific surface area 6 m) instead of amorphous silica (trade name: ACMATT TS-100, manufactured by Degusa AG) ^The aqueous solution was prepared in the same manner as in Example 1 except that the pH of the 2 / g, 5% aqueous dispersion was 4.0 to 6.0). Table 1 shows the content (% by mass) of amorphous silica with respect to the amount of amorphous silica added, the concentration of amorphous silica in the aqueous solution, and the total amount of alkali metal silicate.

[Measurement of viscosity]
Using a B-type viscometer (manufactured by Toki Sangyo Co., Ltd., trade name: BM type), B-type viscosity μ _{6 under} the conditions of 6 rpm and 20 ° C for the aqueous solution and B under the conditions of 60 rpm and 20 ° C for the aqueous solution. The mold viscosity was measured as _{μ 60.} The results are shown in Table 1.

[Manufacturing of coating base material]
(Examples 1 to 13 and Comparative Examples 2 to 5)
Sugi material was prepared as the main body of the base material. A paint containing a versatic acid-vinyl ester resin was applied to the horizontal surface of the Sugi material to form a primer layer, and a substrate having a primer layer formed on the surface of the Sugi material was obtained. A sheet-shaped glass fiber (central glass fiber surface mat FC-30S) is placed on the surface of the obtained base material on which the primer layer is formed, and 1000 g / m ^{2 of an} aqueous alkali metal silicate solution is applied thereto. The base material on which the aqueous solution layer was formed was erected so that the surface on which the aqueous solution layer was formed was perpendicular to the horizontal direction, and the aqueous solution layer was dried. Drying was carried out for 24 hours in an environment of a temperature of 23 ° C. and a humidity of 50% (relative humidity). By drying the alkali metal silicate aqueous solution layer, an alkali metal silicate layer (dry weight 600 g / m ² per unit area of alkali metal silicate) was formed, and a coating base material was obtained.

(Comparative Example 1)
A coating base material was obtained in the same manner as in Example 1 except that the coating amount of the alkali metal silicate aqueous solution was 700 g / m ^2.

[Evaluation: Dripping]
In the production of the coated substrate, when the aqueous solution was dried, the presence or absence of dripping of the aqueous solution on the surface of the substrate on which the aqueous solution layer was formed was confirmed. The presence or absence of dripping was evaluated according to the following criteria. The results are shown in Table 1.
◯: No dripping occurred even after 30 minutes had passed until it dried. Δ: No dripping occurred immediately after standing vertically, but after 30 minutes, it was placed on the bottom of the vertically erected base material. It was confirmed that the aqueous solution accumulated. ×: Immediately after standing vertically, it became a drop and dripping occurred.

[Evaluation: Smoothness (elongation)]
With respect to the obtained coated base material, the smoothness of the surface of the coated base material provided with the alkali metal silicate layer was visually evaluated according to the following criteria. The results are shown in Table 1. The excellent smoothness of the surface of the coating base material means that the aqueous solution has good elongation.
◯: No unevenness is observed on the surface of the coated base material ○ −: Slight unevenness is observed on the surface of the coated base material Δ: Some unevenness is observed on the surface of the coated base material ×: Alkali metal silicate aqueous solution The alkali metal silicate aqueous solution could not be applied because the viscosity of the metal silicate was too high.

[Evaluation: Transparency]
The transparency of the alkali metal silicate layer was visually evaluated for the obtained coated base material. The results are shown in Table 1. ○ means that the grain on the surface of the sugi wood was clearly visible.

10 ... Base material body, 20 ... Primer layer, 25 ... Base material, 30 ... Alkali metal silicate layer, 100 ... Coating base material.

Claims (7)

The process of applying an aqueous solution containing amorphous silica and alkali metal silicate to the surface of the base material,
It comprises a step of drying the applied aqueous solution to form an alkali metal silicate layer.
A method for producing a coating base material, wherein _{the B-type viscosity μ 6 of the} aqueous solution under the conditions of 6 rpm and 20 ° C. is 1500 mPa · s or more. The B-type viscosity at the conditions of 60 rpm, 20 ° C. of the aqueous solution upon the _{mu 60,} it mu ₆ / mu ₆₀ is 3 or more, The method of claim 1, wherein. The method according to claim 1 or 2, wherein the base material is a flammable base material. The method according to any one of claims 1 to 3, wherein the alkali metal silicate contains sodium silicate. The method of claim 4, wherein the alkali metal silicate further comprises lithium silicate. The method according to claim 5, wherein the mass ratio of the mass of the lithium silicate contained in the alkali metal silicate to the mass of the sodium silicate contained in the alkali metal silicate is 0.01 to 1.5. The method according to any one of claims 1 to 6, wherein the content of the amorphous silica contained in the aqueous solution is 3.0 to 160% by mass with respect to the total amount of the alkali metal silicate. ..

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