Architectural member, and method for producing architectural member

Abstract

To provide an architectural member high in heat-shielding property, and a method for producing an architectural member.SOLUTION: An architectural member includes a substrate comprising a heat-durable crystallized glass plate, and a transparent film provided on at least one principal plane of the substrate. The transparent film contains sodium silicate. A method for producing an architectural member includes coating at least one principal plane of the substrate comprising the heat-durable crystallized glass plate with a coating material composition containing sodium silicate to form the transparent film. A method for producing an architectural member includes bonding a transparent film containing sodium silicate to at least one principal plane of the substrate comprising the heat-durable crystallized glass plate.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a building member and a method for manufacturing the building member.

Background Art

[0002] Patent Document 1 discloses heat-resistant crystallized glass. Patent Document 2 discloses a member having a heat ray reflecting film formed on the surface of heat-resistant crystallized glass.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] Heat insulation is required for building members. It is conceivable to use the glass described in Patent Documents 1 and 2 for building members. In that case, the heat insulation of the building members is insufficient. In one aspect of the present disclosure, it is preferable to provide a building member having high heat insulation and a method for manufacturing the building member.

Means for Solving the Problems

[0005] One aspect of the present disclosure is a building member including a base material made of a heat-resistant crystallized glass plate and a transparent film provided on at least one main surface of the base material, wherein the transparent film contains sodium silicate. The building member according to one aspect of the present disclosure has high heat insulation.

[0006] Another aspect of the present disclosure is a method for manufacturing a building member, which forms a transparent film by applying a coating composition containing sodium silicate to at least one main surface of a base material made of a heat-resistant crystallized glass plate. According to the method for manufacturing a building member, which is another aspect of the present disclosure, a building member with high heat insulation properties can be manufactured.

[0007] Another aspect of the present disclosure is a method for manufacturing a building member, which joins a transparent film containing sodium silicate to at least one main surface of a base material made of a heat-resistant crystallized glass plate. According to the method for manufacturing a building member, which is another aspect of the present disclosure, a building member with high heat insulation properties can be manufactured.

Brief Description of the Drawings

[0008]

Figure 1

Embodiments for Carrying Out the Invention

[0009] Exemplary embodiments of the present disclosure will be described with reference to the drawings. 1. Configuration of Building Member 1 As shown in Figures 1A to 1D, the building member 1 includes a base material 3 and a transparent film 5. The transparent film 5 is provided on at least one main surface of the base material 3. Here, the main surface means the surface of a plate-shaped member that has a larger area compared to the others. The base material 3 has two main surfaces. The two main surfaces face each other with the base material 3 interposed therebetween.

[0010] In the forms shown in Figures 1A and 1C, the transparent film 5 is provided on only one main surface of the base material 3. In the forms shown in Figures 1B and 1D, the transparent film 5 is provided on both main surfaces of the base material 3. In the forms shown in Figures 1C and 1D, an outer transparent film 7 with a thickness of 0.5 mm or more and 2 mm or less is further provided outside the transparent film 5. In the form shown in Figure 1D, an outer transparent film 7 is provided outside each of the two transparent films 5. Here, the outside means the side in the direction away from the base material 3.

[0011] The base material 3 is made of a heat-resistant crystallizable glass plate. The base material 3 has a plate-like form. Examples of the heat-resistant crystallizable glass plate include those disclosed in Japanese Patent Laid-Open No. 4-22438. The thickness of the base material 3 is preferably 3 mm or more and 10 mm or less.

[0012] For example, a waterproof seal can be applied to the edge of the base material 3. In this case, the durability of the base material 3 is improved. For example, a vinyl chloride resin or a vinylidene chloride resin dissolved in a solvent can be applied to the edge of the base material 3 and dried. In this case, the durability of the base material 3 is improved.

[0013] The transparent film 5 is a transparent film. In this specification, "transparent" means a state in which light can be taken in through the member to be judged for transparency. "Transparent" is not limited to complete transparency, and for example, it may be translucent. The thickness of the transparent film 5 is preferably 0.5 mm or more and 5 mm or less.

[0014] The transparent film 5 contains sodium silicate. In sodium silicate, the molar ratio of SiO2 / Na2O defined in JIS K 1408:1966 is preferably 1.8 to 3.0, and more preferably 1.8 to 2.6. When the molar ratio of SiO2 / Na2O is 1.8 to 3.0, the transparent film 5 is stable and the flexibility of the transparent film 5 is high.

[0015] The content of sodium silicate in the transparent film 5 is preferably 75% by mass or more and 100% by mass or less, and more preferably 85% by mass or more and 100% by mass or less. The content in the transparent film 5 is the mass ratio with respect to the mass of the total solid content of the transparent film 5.

[0016] The transparent film 5 further contains, for example, a modified silicone resin. The modified silicone resin is a compound having a structure such as polyether polyol, polyester polyol, acrylic polyol, or polycarbonate polyol in the main skeleton and having a reactive silyl group in the main chain or side chain.

[0017] Examples of the modified silicone resin include moisture-curing modified silicone resins. The modified silicone resin polymerizes by hydrolysis of the alkoxy group of the reactive silyl group by moisture in the air and condensation of the generated silanol group. The modified silicone resin may be used alone or in combination of two or more.

[0018] The main skeleton of the modified silicone resin is not particularly limited. Examples of the main skeleton of the modified silicone resin include polyether-based polymers such as polyoxyethylene, polyoxypropylene, and polyoxybutylene; aliphatic hydrocarbon-based polymers such as polyisoprene, polyisobutylene, and polybutadiene; acrylic-based polymers such as poly(meth)acrylic acid and poly(meth)acrylate; and polyester-based polymers.

[0019] Among these, it is preferable to use a polyether-based polymer, and more preferably to use polyoxyalkylene. When a polyether-based polymer is used as the main skeleton, sodium silicate and the modified silicone resin are more easily miscible, and the transparency of the transparent film 5 is further improved.

[0020] The skeleton of the modified silicone resin may be linear or branched. As the skeleton of the modified silicone resin, it is preferable to use a mixture of linear and branched ones. The reactive silyl group is not particularly limited. Examples of the reactive silyl group include an addition-reactive silyl group, a condensation-reactive silyl group, and a hydrolyzable silyl group. More specifically, examples of the reactive silyl group include a group in which a reactive group such as a hydrogen atom, a hydroxyl group, an alkoxy group, a halogen atom, an acyloxy group, an alkenyloxy group, an amide group, an oxime group, a ketoximate group, an amide group, an acid amide group, a mercapto group, and an aminooxy group is bonded to a silicon atom.

[0021] The modified silicone resin preferably has a trimethoxysilyl group or a dimethoxysilyl group at its terminal. Examples of commercially available modified silicone resins include EST-250, OR110S, MA440, MAX602, S227, SA100S, SAT145, SAX015 (manufactured by Kaneka Corporation), STP-E10, STP-E15, STP-E30, STP-E35 (manufactured by Wacker Chemie AG), etc. The viscosity of the modified silicone resin is preferably 0.1 to 20 Pa·s, more preferably 0.2 to 10 Pa·s.

[0022] In the transparent film 5, with respect to 80 parts by mass of sodium silicate, the preferable blending amount of the modified silicone resin is 1 part by mass or more and 100 parts by mass or less, more preferably 2 parts by mass or more and 80 parts by mass or less, and particularly preferably 2 parts by mass or more and 10 parts by mass or less. When the blending amount of the modified silicone resin is within this range, the moisture resistance and flame retardancy of the transparent film 5 are further improved.

[0023] The transparent film 5 further contains, for example, a curing catalyst. The curing catalyst accelerates the curing of the transparent film 5 and further improves the moisture resistance of the transparent film 5 when the transparent film 5 is formed. The curing catalyst is not limited. Examples of the curing catalyst include organotin compounds, acidic phosphate esters, reaction products of acidic phosphate esters and amines, saturated or unsaturated polycarboxylic acids or their acid anhydrides, organic titanate compounds, organic aluminum compounds, metal complexes, organic acid bismuth, etc.

[0024] Examples of the organotin compound include dibutyltin dilaurate, dioctyltin dimaleate, dibutyltin phthalate, tin octylate, dibutyltin methoxide, etc. Examples of commercially available organotin compounds include Neostan (manufactured by Nitto Kasei Co., Ltd.).

[0025] Examples of the organic titanate compound include tetrabutyl titanate, tetraisopropyl titanate, triethanolamine titanate, etc. Examples of the organic aluminum compound include aluminum trisacetylacetonate, aluminum trisethylacetoacetate, diisopropoxyaluminum ethylacetoacetate, etc.

[0026] Examples of the metal complex include zirconium tetraacetylacetonate, titanium tetraacetylacetonate, etc. Examples of the organic bismuth acid include bismuth octylate, bismuth neodecanoate, bismuth rosinate, etc. Commercially available products of the organic bismuth acid include Neostan (manufactured by Nitto Kasei Co., Ltd.), Borchi Kat (manufactured by Matsuo Sangyo Co., Ltd.), etc. These curing catalysts may be used alone or in combination of two or more.

[0027] The addition amount of the curing catalyst is not particularly limited. From the viewpoint of the water resistance of the transparent film 5, the addition amount of the curing catalyst is preferably 0.05 to 10 parts by mass, more preferably 0.1 to 2 parts by mass, based on 100 parts by mass of the modified silicone resin.

[0028] The transparent film 5 further contains, for example, glass fibers. When the transparent film 5 contains glass fibers, cracking of the transparent film 5 can be suppressed. The diameter of the glass fibers is preferably 2 μm or more and 15 μm or less. The length of the glass fibers is preferably 3 μm or more and 200 μm or less, more preferably 5 μm or more and 50 μm or less. The value obtained by dividing the length of the glass fibers by the diameter of the glass fibers is defined as the aspect ratio of the glass fibers. The aspect ratio of the glass fibers is preferably 1.5 or more and 5.5 or less.

[0029] The transparent film 5 can contain, for example, additives, pigments, etc. used in ordinary paints, as long as the flame retardancy and transparency are not significantly impaired. Examples of the additives include thickeners, pH adjusters, ultraviolet absorbers, dispersants, wetting agents, preservatives, dyes, defoamers, pigments, etc.

[0030] Examples of the thickener include clay minerals such as organically modified smectite, and silica. Examples of the pH adjuster include aqueous ammonia and sodium hydroxide. Examples of the pigment include inorganic pigments, organic pigments, extender pigments, etc. Examples of the inorganic pigment include carbon black, titanium oxide, iron oxide, etc. Examples of the organic pigment include quinacridone, azo pigments, etc. Examples of the extender pigment include barium sulfate, talc, mica, etc.

[0031] The transparent film 5 may contain an antioxidant, for example, for the purpose of preventing yellowing. Examples of the antioxidant include phosphorus-based, hydroquinone-based, bis·tris·polyphenol-based, thiobisphenol-based, and hindered phenol-based antioxidants.

[0032] The outer transparent film 7 is a transparent film. Examples of the material of the outer transparent film 7 include float glass, PET, polycarbonate, acrylic resin, etc. Float glass is preferable as the material of the outer transparent film 7. When the material of the outer transparent film 7 is float glass, the durability of the outer transparent film 7 is further improved. The thickness of the outer transparent film 7 is 0.5 mm or more and 2 mm or less. The outer transparent film 7 is in contact with the transparent film 5, for example.

[0033] 2. Manufacturing method of the building member 1 (2-1) First manufacturing method As a manufacturing method of the building member 1, there is a method of forming the transparent film 5 by applying a coating composition containing sodium silicate on at least one main surface of the base material 3. The coating film of the coating composition becomes the transparent film 5. The coating composition further contains, for example, a modified silicone resin.

[0034] The coating composition contains the components of the transparent film 5 and volatile components. Examples of the volatile component include water. In the coating composition, the mass ratio of the non-volatile components is preferably 40 to 65% by mass, more preferably 50 to 60% by mass. When the mass ratio of the non-volatile components is within this range, the coating workability of the coating composition is further excellent.

[0035] When manufacturing the building member 1 in the form shown in Fig. 1C or Fig. 1D, after applying the paint composition, when the moisture content of the paint film of the paint composition is 5% by mass or more and 10% by mass or less, it is preferable to place the outer transparent film 7 on the paint film of the paint composition.

[0036] The paint composition can be manufactured, for example, as follows. Sodium silicate is contained in a paint manufacturing container. Next, while stirring with a mixer, additives, pigments, modified silicone resins, etc. are added to form a uniform solution. At this time, it may be diluted with water for viscosity adjustment. The uniform solution is the paint composition.

[0037] In the paint composition, if there is no curing catalyst, the reaction between moisture and the modified silicone resin (for example, a moisture-curing type modified silicone resin) is very slow. Therefore, the paint composition can maintain fluidity for about several days to several months. For example, when the paint composition is stored, the paint composition does not contain a curing catalyst. Immediately before use, a curing catalyst is mixed into the paint composition. In this case, long-term storage of the paint composition becomes possible.

[0038] (2-2) Second manufacturing method As a manufacturing method of the building member 1, there is a method of bonding a transparent film 5 containing sodium silicate to at least one main surface of the base material 3. The transparent film 5 further contains, for example, a modified silicone resin.

[0039] When bonding the transparent film 5 to the main surface of the base material 3, it is preferable that the moisture content of the transparent film 5 is 5% by mass or more and 10% by mass or less. When manufacturing the building member 1 in the form shown in Fig. 1C or Fig. 1D, when the moisture content of the transparent film 5 bonded to the base material 3 is 5% by mass or more and 10% by mass or less, it is preferable to place the outer transparent film 7 on the transparent film 5.

[0040] The transparent film 5 has a sheet-like form before bonding to the main surface of the base material 3. The transparent film 5 having a sheet-like form (hereinafter referred to as the sheet-like transparent film 5A) can be manufactured, for example, as follows. While kneading sodium silicate with a mixer, a modified silicone resin, an additive, a pigment, a curing catalyst, etc. are added to prepare a uniform clay-like or viscous solution-like member (hereinafter referred to as a sheet intermediate). When preparing the sheet intermediate, water may be added for viscosity adjustment.

[0041] In the sheet intermediate, if there is no curing catalyst, even if water and a modified silicone resin (for example, a moisture-curing type modified silicone resin) are mixed, the reaction is very slow. Therefore, the sheet intermediate can maintain fluidity for about several days to several weeks. For example, when the sheet intermediate is stored, the sheet intermediate does not contain a curing catalyst. Immediately before use, the curing catalyst is mixed into the sheet intermediate. In this case, long-term storage of the sheet intermediate becomes possible.

[0042] Next, by molding the sheet intermediate, a sheet-like transparent film 5A is produced. Specifically, the following steps are performed. Using a knife coater, the sheet intermediate is applied onto a synthetic resin film through a mold of a predetermined width and thickness and dried. Next, the sheet intermediate is sandwiched between synthetic resin films from both sides in its thickness direction. Through the above steps, a sheet-like transparent film 5A is obtained.

[0043] The molding method is not limited to the method using a knife coater. For example, it may be molded using an extruder, or the sheet intermediate may be poured into a mold and molded. Also, the sheet intermediate may be pressed and molded. The molding method may be in a wound form or in a single-sheet form.

[0044] For example, the sheet intermediate may be heated before molding. By heating the sheet intermediate, the drying time can be shortened and the bubbles contained in the sheet-like transparent film 5A can be reduced. When heating the sheet intermediate, the temperature of the sheet intermediate is preferably 30 to 80°C, more preferably 40 to 60°C.

[0045] By drying the sheet intermediate, it is preferable to sandwich the sheet intermediate with a synthetic resin film in a state where the mass of the sheet intermediate is reduced by 10 to 15% by mass. In this case, the transparency of the sheet-like transparent film 5A is further improved.

[0046] In the sodium silicate contained in the sheet intermediate, the Baume gravity at 15 °C defined in JIS K 1408:1966 is preferably 45 to 80. When the Baume gravity is within this range, the moldability of the sheet-like transparent film 5A is improved.

[0047] The sheet intermediate preferably has a high viscosity and low fluidity. When the sheet intermediate is clay-like, the moldability of the sheet-like transparent film 5A is further improved. The non-volatile content of the sheet intermediate is preferably 75 to 99% by mass, and more preferably 80 to 95% by mass. When the non-volatile content is within this range, the moldability of the sheet-like transparent film 5A is improved.

[0048] The width of the sheet-like transparent film 5A is, for example, 1000 mm. Also, the thickness of the sheet-like transparent film 5A is, for example, 1.5 mm. As the synthetic resin film used in molding, for example, a film made of a transparent synthetic resin such as PET, polyethylene, polypropylene, or polyvinyl alcohol can be used. Also, a release treatment may be performed on the surface of the synthetic resin film with a silicone resin or the like. When the release treatment is performed, adhesion of the sheet intermediate to the manufacturing equipment can be suppressed.

[0049] An adhesive film having an adhesive layer may be provided on the surface of the synthetic resin film. In this case, the adhesion between the synthetic resin film and the sheet-like transparent film 5A is improved. Examples of the adhesive layer include a urethane resin and an acrylic resin. The thickness of the adhesive layer is preferably 10 to 100 μm. In molding, a glass plate may be used instead of the synthetic resin film.

[0050] When drying the sheet intermediate, the temperature is preferably 150°C or lower, more preferably 40 - 60°C. When drying the sheet intermediate, forced drying can be performed using a drying furnace. For example, a temperature gradient can be provided inside the drying furnace. For example, the temperature is low at the entrance of the drying furnace and can be gradually increased towards the back of the drying furnace. In this case, since moisture can be gradually volatilized from the sheet intermediate, generation of bubbles due to rapid volatilization of moisture can be suppressed. When drying the sheet intermediate, natural drying may also be performed.

[0051] 3. Effects Exhibited by Building Member 1 (3 - 1) Building Member 1 has high heat insulation, flame insulation, and smoke insulation properties. In particular, Building Member 1 has high heat insulation, flame insulation, and smoke insulation properties even with a thin thickness.

[0052] (3 - 2) The transparent film 5 further contains, for example, a modified silicone resin. In this case, Building Member 1 has even higher heat insulation, flame insulation, and smoke insulation properties. (3 - 3) Building Member 1 further contains, for example, an outer transparent film 7. In this case, Building Member 1 has even higher heat insulation, flame insulation, and smoke insulation properties.

[0053] (3 - 4) The outer transparent film 7 is made of, for example, float glass. In this case, the durability of the outer transparent film 7 is even higher. (3 - 5) Building Member 1 has transparency. Therefore, by using Building Member 1, an open space can be realized. Also, by using Building Member 1, a building with high designability can be constructed.

[0054] (3 - 6) As a conventional technique, for the purpose of enhancing the heat insulation of a building member made of glass, there is a method of spraying water on the building member with a water spraying facility such as a sprinkler to cool the glass surface. To use this method, it is necessary to provide a water spraying facility. Also, there is a risk of glass breakage due to rapid cooling of the glass by water spraying. In contrast, by using Building Member 1, it is not necessary to spray water on Building Member 1, so the above problems can be suppressed.

[0055] (3-7) As a conventional technique, there is a member in which water glass and float glass are laminated multiple times. This member is thick and heavy. Also, because of its complex structure, this member has low productivity. In contrast, the building member 1 can be made thin and light. Also, the building member 1 can simplify the structure and increase productivity.

[0056] (3-8) The building member 1 can be provided, for example, between a first section and a second section within a building. Since the building member 1 has high heat insulation, flame insulation, and smoke insulation properties, even if a fire breaks out in the first section, it is possible to suppress the spread of the fire to the second section. Also, even if a fire breaks out in the first section, it is possible to suppress the transfer of combustion heat from the first section to the second section. As a result, it is possible to suppress the spontaneous ignition of the inner walls and furniture etc. within the second section. Also, even if a fire breaks out in the first section, the second section can be used as an evacuation route. In that case, a person evacuating through the second section is less likely to be affected by the heat of the fire. Also, even if a fire breaks out in the first section, it is possible to suppress the outflow of smoke from the first section to the second section.

[0057] 4. Examples (4-1) Manufacture of the paint composition The paint compositions S1 to S2 were manufactured by mixing the components described in the row of "Composition of the paint composition" in Table 1 with water.

[0058]

Table 1

[0059] The numerical values described in the row of "Composition of the paint composition" in Table 1 are the blending amounts of the respective components. The unit of the blending amount is parts by mass. The components described in the row of "Composition of the paint composition" are non-volatile components. In the paint compositions S1 to S2, the mass ratio of the total non-volatile components to the total mass of the paint composition was 60% by mass, and the mass ratio of water was 40% by mass.

[0060] The modified silicone resin in Table 1 was a branched silicone resin (manufactured by Kaneka Corporation, product name SAT400, viscosity 24 Pa·s). The curing catalyst in Table 1 was zirconium tetraacetylacetonate.

[0061] Table 1 shows the molar ratio of SiO2 / Na2O of sodium silicate contained in the coating compositions S1 to S2. This molar ratio of SiO2 / Na2O is the molar ratio defined in JIS K 1408:1966. (4-2) Production of the sheet-like transparent film 5A The components described in the row of "Composition of the sheet-like transparent film 5A" in Table 2 were kneaded. The numerical values described in the row of "Composition of the sheet-like transparent film 5A" are the blending amounts of the components. The unit of the blending amount is parts by mass. The components described in the row of "Composition of the sheet-like transparent film 5A" are non-volatile components. Next, the kneaded material was coated on a synthetic resin film with a knife coater and dried to produce the sheet-like transparent film 5A. The water content of the sheet-like transparent film 5A was 5% by mass.

[0062]

Table 2

[0063] The modified silicone resin in Table 2 was a mixture of a branched silicone resin (manufactured by Kaneka Corporation, product name: EST280, viscosity 7 Pa·s) and a linear silicone resin (manufactured by Kaneka Corporation, product name: SAT350, viscosity 6 Pa·s) with a mass ratio of 1:1. The curing catalyst in Table 2 was triethanolamine titanate.

[0064] (4-3) Production of the building member 1 (i) Example 1 As the base material 3, a heat-resistant crystallizable glass plate was prepared. The heat-resistant crystallizable glass plate was of the product name "Firelite Neo" and was manufactured by Nippon Electric Glass Co., Ltd. The thickness of the heat-resistant crystallizable glass plate was 5 mm. The shape of the heat-resistant crystallizable glass plate was square. The length of each side of the square was 70 mm.

[0065] The coating composition S2 was poured onto both main surfaces of the base material 3 and dried. Next, float glass with a thickness of 2 mm was bonded onto the coating films of the coating composition S2 on both sides, respectively. When the float glass was bonded, the water content of the coating film of the coating composition S2 was 5% by mass.

[0066] The coating film of the coating composition S2 became the transparent film 5. The thickness of the transparent film 5 was 2 mm. The float glass became the outer transparent film 7. Through the above steps, the building member 1 in the form shown in Fig. 1D was obtained. The configurations and manufacturing methods of Example 1 and each of the following Examples and Comparative Examples are shown in Table 3.

[0067]

Table 3

[0068] (ii) Example 2 As the base material 3, a heat-resistant crystallization glass plate similar to that in Example 1 was prepared. The coating composition S2 was poured onto only one main surface of the base material 3 and dried. Next, float glass with a thickness of 2 mm was bonded onto the coating film of the coating composition S2. When the float glass was bonded, the water content of the coating film of the coating composition S2 was 5% by mass.

[0069] The coating film of the coating composition S2 became the transparent film 5. The thickness of the transparent film 5 was 2 mm. The float glass became the outer transparent film 7. Through the above steps, the building member 1 in the form shown in Fig. 1C was obtained. (iii) Example 3 In the same manner as in Example 2, the building member 1 in the form shown in Fig. 1C was manufactured.

[0070] (iv) Example 4 Basically in the same manner as in Example 1, the building member 1 in the form shown in Fig. 1D was manufactured. However, as the outer transparent film 7, a PET film with a thickness of 100 μm was used instead of float glass.

[0071] (v) Example 5 As the base material 3, a heat-resistant crystallization glass plate similar to that in Example 1 was prepared. The coating composition S2 was poured onto both main surfaces of the base material 3 and dried. The coating film of the coating composition S2 became the transparent film 5. The thickness of the transparent film 5 was 2 mm. Through the above steps, the building member 1 in the form shown in Fig. 1B was obtained.

[0072] (vi) Example 6 Basically in the same manner as in Example 1, the building member 1 in the form shown in Fig. 1D was manufactured. However, instead of the coating composition S2, the coating composition S1 was used. The coating film of the coating composition S1 became the transparent film 5. The thickness of the transparent film 5 was 2 mm.

[0073] (vii) Example 7 As the base material 3, a heat-resistant crystallization glass plate similar to that in Example 1 was prepared. The sheet-shaped transparent film 5A manufactured in the above (4-2) was joined only to one main surface of the base material 3. Next, float glass with a thickness of 2 mm was joined onto the sheet-shaped transparent film 5A. When joined to the base material 3, the moisture content of the sheet-shaped transparent film 5A was 5% by mass. Also, when the float glass was joined, the moisture content of the sheet-shaped transparent film 5A was 5% by mass.

[0074] The thickness of the sheet-shaped transparent film 5A was 2 mm. The sheet-shaped transparent film 5A became the transparent film 5. The float glass became the outer transparent film 7. Through the above steps, the building member 1 in the form shown in Fig. 1C was obtained.

[0075] (Viii) Comparative Example 1 A heat-resistant crystallization glass plate similar to that in Example 1 was used as the building member of Comparative Example 1. (ix) Comparative Example 2 As the base material 3, a heat-resistant crystallization glass plate similar to that in Example 1 was prepared. Float glass with a thickness of 2 mm was bonded to both main surfaces of the heat-resistant crystallization glass plate using an epoxy adhesive, respectively.

[0076] (4-4) Evaluation of the building member 1 For the building members of each example and each comparative example, the heat insulation property was evaluated. The evaluation method of the heat insulation property was as follows.

[0077] One main surface of the building member (hereinafter referred to as the heating surface) was heated in an electric furnace, and the temperature of the main surface on the side opposite to the heating surface (hereinafter referred to as the non-heating surface) in the building member was continuously measured by a K thermocouple. In Examples 2 and 7, the main surface provided with the outer transparent film 7 was used as the heating surface. In Example 3, the main surface on the side opposite to the main surface provided with the outer transparent film 7 was used as the heating surface.

[0078] The temperature T of the heating surface was controlled so as to satisfy the following formula (1). Formula (1) T = 2×10 -7 ×t 3 -0.0009×t 2 +1.3835×t + 23 In formula (1), the unit of T is °C. t is the elapsed time from the start of heating. The unit of t is seconds. The heat insulation property was evaluated according to the following criteria.

[0079] ◎: The time required for the temperature of the non-heating surface to reach 200°C from the start of heating (hereinafter referred to as the temperature rise required time) was 660 seconds or more. ○: The temperature rise required time was 600 seconds or more and less than 660 seconds.

[0080] △: The temperature rise required time was 580 seconds or more and less than 600 seconds. ×: The temperature rise required time was less than 580 seconds. The evaluation results are shown in Table 3. The building member 1 of each example had high heat insulation property. On the contrary, the building members of each comparative example had low heat insulation property.

[0081] 5. Other Embodiments As described above, the embodiments of the present disclosure have been described. However, the present disclosure is not limited to the above-described embodiments and can be implemented with various modifications.

[0082] (1) The transparent film 5 may not contain a modified silicone resin. Also in this case, the building member 1 has higher heat insulation, flame shielding, and smoke shielding properties than the base material 3 without the transparent film 5. Examples of the composition of the transparent film 5 that does not contain a modified silicone resin include, for example, the composition obtained by removing the modified silicone resin and the curing catalyst from the composition of the transparent film 5 in each of the examples.

[0083] (2) The functions of one component in each of the above embodiments may be shared by a plurality of components, or the functions of a plurality of components may be exerted by one component. Also, a part of the configuration of each of the above embodiments may be omitted. Further, at least a part of the configuration of each of the above embodiments may be added to, substituted for, etc. the configuration of other of the above embodiments.

[0084] (3) In addition to the building member 1 described above, the present disclosure can also be realized in various forms such as a system including the building member 1 as a component, a building method of a building, a heat insulation method, and the like.

Explanation of Reference Numerals

[0085] 1... Building member, 3... Base material, 5... Transparent film, 5A... Sheet-like transparent film, 7... Outer transparent film

Claims

1. A base material made of a heat-resistant crystallizable glass plate, A transparent film provided on at least one main surface of the base material, Comprising, The transparent film contains sodium silicate, Building member.

2. The building member according to Claim 1, The transparent film further contains a modified silicone resin, Building member.

3. The building member according to Claim 1 or 2, On the outside of the transparent film, it further comprises an outer transparent film with a thickness of 0.5 mm or more and 2 mm or less, Building member.

4. By applying a paint composition containing sodium silicate on at least one main surface of a base material made of a heat-resistant crystallizable glass plate, a transparent film is formed, Manufacturing method of building member.

5. The manufacturing method of the building member according to Claim 4, The paint composition further contains a modified silicone resin, Manufacturing method of building member.

6. Bonding a transparent film containing sodium silicate to at least one main surface of a base material made of a heat-resistant crystallizable glass plate, Manufacturing method of building member.

7. The manufacturing method of the building member according to Claim 6, The transparent film further contains a modified silicone resin, Manufacturing method of building member.

8. The manufacturing method of the building member according to any one of Claims 4 to 7, On the outside of the transparent film, an outer transparent film with a thickness of 0.5 mm or more and 2 mm or less is further provided, Manufacturing method of building member.

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