JP4758086B2 - Construction structure using a sealing material used for polycarbonate resin parts with photocatalytic function - Google Patents

Description

  The present invention relates to a sealing material used for a polycarbonate resin member having a photocatalytic function, and a construction structure using the sealing material.

  Polycarbonate resin is excellent in mechanical strength, translucency, weather resistance, etc., so it can be used for building materials such as carports and roofing materials for terraces, road materials such as soundproof boards for highways, side walls for general roads, and waistboards for pedestrian bridges. It is used for construction structural materials. And in roof materials, soundproof plates, side wall materials, waist plates, etc. used outdoors, in order to prevent water leakage by giving the water tightness of the joint portions of each member, the joint portions are filled with a sealing material. It is sealed. As this sealing material, generally, a silicone-based sealing material that does not cause defects such as cracks in the polycarbonate resin material is used.

  On the other hand, in recent years, products made of various materials such as glass, aluminum panels, extruded aluminum materials, tiles, and synthetic resin bodies that have a photocatalytic layer formed on the surface of a base material such as synthetic resin have been developed. Yes. These products are used in various applications because they decompose the bad odor, have antibacterial and antifungal properties, and exhibit hydrophilic and antifouling properties by the photocatalyst particles exposed on the surface. ing. Further, the use of the polycarbonate resin roof material, soundproof plate, side wall material, waist plate and the like has been studied, and it is expected as a material that exhibits hydrophilicity and antifouling properties.

As a sealing material for sealing the seam of products having such a photocatalytic function, when a silicone-based sealing material that has been generally used for polycarbonate resin materials so far is used, low molecular weight silicone oil precipitates from the sealing material, and the surface layer Although it adheres to the photocatalyst layer, since this silicone oil is a silicon-based inorganic substance, it cannot be decomposed by the photocatalyst particles, but adheres to the photocatalyst layer and inhibits the photocatalytic function, and only the periphery of the sealing material becomes hydrophobic. There was a problem that dust and the like adhered. For this reason, a modified silicone sealing material that does not ooze out silicone oil has been developed to stably exhibit antifouling effects and self-cleaning effects over a long period of time (Patent Document 1).
Japanese Patent Application Laid-Open No. 2002-167871

However, the modified silicone sealing material described in Patent Document 1 contains a plasticizer or a solvent such as dioctyl phthalate in order to obtain the flexibility and fluidity necessary for the sealing material. Since this dioctyl phthalate is a good solvent for the polycarbonate resin, when it is used as a sealing material for the polycarbonate resin plate, a new problem that a crack or the like occurs in the plate occurs.
The present invention has been made to solve the above-described problems, and provides a sealing material that can be used for a polycarbonate resin member having a photocatalytic function, and a construction structure using the sealing material.

In the construction structure according to the present invention, a curved polycarbonate resin member formed by forming a photocatalyst layer on the surface of a polycarbonate resin substrate and other members are mainly composed of an organic polymer or a modified silicone polymer and corrode the polycarbonate resin. a building structure ing and sealed with a sealing material containing no plasticizer and a solvent, has a thickness of the photocatalyst layer is 5～35Nm, and the radius of curvature of the polycarbonate resin member is 250mm or more It is characterized by this.

In another construction structure of the present invention, members arranged on the water side of a curved polycarbonate resin member formed by forming a photocatalyst layer on the surface of a polycarbonate resin substrate are mainly composed of an organic polymer or a modified silicone polymer. a building structure to seal ing with a sealing material containing no plasticizer and solvent corrodes and polycarbonate resin as a component, the photocatalyst layer has a thickness of 5～35Nm, and, of polycarbonate resin member The curvature radius is 250 mm or more .

  The sealing material for use in a polycarbonate resin member having a photocatalytic function is mainly composed of an organic polymer or a modified silicone polymer and does not contain a plasticizer and a solvent that attack the polycarbonate resin. Silicone oil does not precipitate, and the periphery sealed with a sealing material also exhibits a photocatalytic function, becomes hydrophilic, and exhibits antifouling performance. And since it does not contain plasticizers such as dioctyl phthalate that attack the polycarbonate resin and solvents such as toluene, the polycarbonate resin is not attacked by the sealing material, and defects such as cracks do not occur. It can be used for a long time as a material for construction structures used outdoors such as side walls and waistboards.

Ambient The building structure of the present invention seals a polycarbonate resin member with other members curved with the sealing material, since no silicone oil is precipitated from the sealing material, which is sealed polycarbonate resin member Of course, the photocatalytic function is exhibited at any location, it becomes hydrophilic, and it can be used as a roofing material with excellent antifouling property, and further, there is no occurrence of cracks due to plasticizers and solvents. The construction structure used outdoors, such as a roofing material, a soundproof board, a side wall material, and a waist board, can be hold | maintained.

Furthermore, the construction structure of the present invention in which the other members disposed on the water side above the curved polycarbonate resin member using the sealing material are sealed does not cause silicone oil to precipitate from the sealing material. Without flowing down to the resin member, the photocatalytic function is exhibited at any location of the polycarbonate resin member, it becomes hydrophilic, and it can be made a member with excellent antifouling properties, and a plasticizer and Since the solvent does not flow down, the construction structure can be maintained for a long time without the occurrence of cracks.

  Further, when the photocatalyst layer has a thickness of 5 to 35 nm, even if the polycarbonate resin base material constituting the polycarbonate resin member is thermally expanded and contracted, the photocatalyst layer does not generate cracks following the thermal expansion and contraction. Therefore, the polycarbonate resin member does not become cloudy and the photocatalytic function can be maintained for a long time.

  An embodiment of the present invention will be described below with reference to the drawings, but the present invention is not limited to this embodiment.

  FIG. 1 is a sectional view showing a polycarbonate resin roof structure which is one of the construction structures of the present invention, FIG. 2 is an enlarged sectional view of a part thereof, and FIG. 3 is an enlarged sectional view of a polycarbonate resin member (plate material). FIG.

  The roof structure made of polycarbonate resin shown in FIG. 1 is a roof structure such as a terrace T attached to an outer wall W of a house, and a polycarbonate resin base material is formed on a frame made up of a horizontal beam 1, a vertical beam 2 and a column 3. A polycarbonate resin member (roof plate material 4) formed by forming a photocatalyst layer on the surface is attached.

  The horizontal beam 1 is composed of an upper horizontal beam 11 having a U-shaped cross section fixed to the outer wall W with a screw B or the like, an insertion portion 12a having a U-shaped cross section opening upward, and a U-shaped rain gutter 12b. A horizontal beam 12 is formed, and a column 3 is attached to and supported by the lower horizontal beam 12. As shown in FIG. 2 in an enlarged manner, the upper horizontal rail 11 has its upper surface and outer wall W sealed in a watertight manner with a sealing material S1. The upper horizontal rail 11 and the lower horizontal rail 12 are connected by a plurality of vertical rails 2 to form a frame structure of a terrace roof. The upper horizontal beam 11, the lower horizontal beam 12, the vertical beam 2, and the support column 3 are made of aluminum or aluminum alloy.

  The roof plate material 4 is placed on two or three or more vertical rails 2 and is mounted thereon. The upper end portion 4a thereof is inserted into the U-shaped portion 11a of the upper horizontal rail 11 and the lower end portion 4b thereof is positioned below. It is inserted into the U-shaped insertion part 12a of the crosspiece 12 and fixed. And the upper surface of the upper end part 4a of the roof board | plate material 4 and the inner upper surface of the U-shaped part 11a of the upper crosspiece 11 are watertightly sealed with the sealing material S2, as shown in FIG.

  As shown in FIG. 3, the roof plate 4 is formed by laminating an adhesive layer 42, a protective layer 43, and a photocatalyst layer 44 in this order on the upper surface of a base material 41 made of polycarbonate resin. The total light transmittance and haze are 1.5 mm to 4.0 mm, and the thickness is 3 to 10% and 1 to 5%, respectively.

  The polycarbonate resin substrate 41 may be transparent, translucent, or opaque, but is preferably a substrate 41 having heat absorption. In the heat ray absorbing base material 41, the inside of the terrace can be lowered by about 1 to 5 ° C. from the outside air temperature, and the total light transmittance lowered by the addition of the heat ray absorbent is further lowered by dust or the like. Can be suppressed by the hydrophilic / antifouling function of the photocatalyst layer 44, so that the total light transmittance at the time of installation is not significantly reduced, and haze is not lowered. In addition, other functions such as a heat ray reflecting function, an ultraviolet ray cutting function, and an antifogging function different from the heat ray absorbing function can be added to the base material 41.

  The adhesive layer 42 is made of an adhesive resin such as a urethane resin, an acrylic resin, a polyvinyl alcohol resin, a vinyl acetate resin, a thermoplastic epoxy resin, or a silicone resin, and has a thickness of 0.1 to 50 μm. It is formed to become. Of these adhesive resins, acrylic resins are most preferably used.

  The protective layer 43 is a layer for preventing the photocatalytic action of the photocatalyst layer 44 from acting on the adhesive layer 42 and the polycarbonate resin base material 41, such as inorganic substances such as silica, polydimethylsiloxane, acrylic resin, fluororesin, etc. Inorganic-organic layers formed from a composition comprising an inorganic substance and an organic substance, such as a composition in which a binder resin is uniformly mixed, or a copolymer resin of a silicone resin and an acrylic resin. The thickness is 0.01 to 10 μm. Then, the protective layer 3 may contain an ultraviolet absorber to prevent the adhesive layer 42 and the base material 41 from being deteriorated.

  The photocatalyst layer 44 is a layer formed by uniformly dispersing photocatalyst particles and silica together with 1% by mass or less of a dispersant and a binder as required, and the photocatalyst particles contained therein have a bad odor. It exhibits photocatalytic functions such as decomposing, antibacterial and antifungal action, and antifouling action due to hydrophilicity.

The photocatalyst particles are not particularly limited as long as they can exhibit a photocatalytic function. For example, metal oxides such as titanium oxide, zinc oxide, tin oxide, SrTiO ₃ , and WO ₃ are used. Among these, titanium oxide, particularly anatase-type titanium oxide, is most preferably used because it exhibits a photocatalytic function well and is easily available. The photocatalyst particles are contained in the photocatalyst layer 44 by 5 to 50% by mass. If the amount is 5% by mass or less, it is difficult to exert the photocatalytic function. On the other hand, if the amount is 50% by mass or more, the photocatalytic function is not further improved and the material is wasted.

  Although the thickness of this photocatalyst layer 44 can also be made into 5-100 nm, when exposed to sunlight, such as the roofing board material 4, it is preferable to make the thickness into 5-35 nm, More preferably, it is 10-30 nm. Since the photocatalyst layer 44 is an inorganic layer composed of photocatalyst particles and silica as described above, the photocatalyst layer 44 hardly expands and contracts, and if the thickness is too thick, it cannot follow the thermal expansion and contraction of the substrate 41. For this reason, when the roof plate 4 is placed outdoors and exposed to sunlight, the base material 41 is thermally expanded and contracted by heat, cracks are generated in the photocatalyst layer 44 that cannot follow this, and the appearance becomes cloudy and cannot be actually used. In particular, it is not preferable that the roof plate material 4 is transparent or translucent because transparency is impaired due to white turbidity. However, if it is too thin, the photocatalytic function is lowered and the antifouling property cannot be exhibited. Therefore, the thickness of the photocatalyst layer 44 is set to 5 to 35 nm so that cracks do not occur even when the base material 41 expands and contracts due to heat, and the photocatalytic function can be exhibited.

  Furthermore, when the thickness of the photocatalyst layer 44 is 5 to 35 nm, as shown in FIG. 1, the photocatalyst layer 44 can be applied without being cracked even if the roof plate 4 is curved. This curvature can be applied without cracking if the curvature radius of the plate material is 250 mm or more, preferably 300 mm or more, but if the curvature radius is smaller than this, the photocatalyst layer 44 cannot follow the elongation and cracks occur. Become.

  Since the roof sheet material 4 has the above-described structure, hydrophilicity is exhibited when sunlight hits the photocatalyst layer 44 on the surface, and dust attached to the roof sheet material 4 is highly hydrophilic when it rains. The roof plate material 4 has a function (antifouling function) to be washed away from the surface of the roof plate material 4 that has become characteristic and can be cleaned for a long period of time without generating cracks in the photocatalyst layer 44. It has been.

  The sealing material S1 sealing the upper surface of the upper horizontal rail 11 and the outer wall W and the sealing material S2 sealing the roof plate material 4 and the upper horizontal rail 11 are made of the same sealing material S. Yes.

    The sealing material S is composed mainly of an organic polymer or a modified silicone polymer and does not contain a plasticizer and a solvent that attack the polycarbonate resin. And a filler, a hardening | curing agent, etc. are added as needed.

  Examples of the organic polymer include polyoxyalkylenes such as oxyethylene and oxypropylene, acrylic acid esters such as ethyl (meth) acrylate and butyl (meth) acrylate, polyesters, polyolefins, polysulfides, polyamides, Polycarbonate, polyurethane, and other polymers, and polymers added by reacting halogens such as fluorine to these polymers, or carboxyl groups, isocyanate groups, and vinyl groups at the ends and side chains of these polymers. And polymers having reactive groups such as amide groups and amino groups are used alone or in combination.

  The modified silicone polymer is a polymer having the following general formula in which reactive silicon is introduced at the terminal or side chain of each organic polymer, and these are used alone or in combination.

但し、Ｒ^１は、炭素数が１〜２０のアルキル基、炭素数が６〜２０のアリール基、炭素数が７〜２０のアラルキル基、或は有機ケイ素基である。
Ｘは、水素、ハロゲン、水酸基、アルコキシ基、アシルオキシ基、オキシム基、アミノ基、アミド基、アミノオキシ基、アルレニルオキシ基などであり、シロキサン結合を形成し得る官能基である。
ａは０、１、２の整数、ｂは０、１、２、３、の整数、ａ＝２のときはｂ＝３ではない。ｍは０〜１８の整数である。

R ¹ is an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, or an organosilicon group.
X is hydrogen, a halogen, a hydroxyl group, an alkoxy group, an acyloxy group, an oxime group, an amino group, an amide group, an aminooxy group, an allenyloxy group, or the like, which is a functional group capable of forming a siloxane bond.
a is an integer of 0, 1, 2; b is an integer of 0, 1, 2, 3; when a = 2, b is not 3. m is an integer of 0-18.

  Among the modified silicone polymers having this general formula, a modified silicone polymer having 1 to 4 carbon atoms and having a terminal dimethoxymethylsilicon group is preferably used.

  This modified silicone polymer has a reactive active group and a reactive silicon group in a functional group such as a hydroxyl group, an alkoxide group, an isocyanate group, an amino group, or a vinyl group at the terminal or side chain of the organic polymer. It can be easily obtained by reacting the compound.

  Examples of the compound having an active group and a reactive silicon group exhibiting the above-mentioned reactivity include γ-isocyanatepropylmethyldimethoxysilane, γ-isocyanatopropylmethyldiethoxysilane, vinyltrichlorosilane, vinylmethyldichlorosilane, vinyldimethylchlorosilane, vinyl Dimethylmethoxysilane, divinyldichlorosilane, divinyldimethoxysilane, vinylmethyldichlorosilane, allylmethoxydichlorosilane, allyldimethylchlorosilane, allyldimethylmethoxysilane, diallyldichlorosilane, diallyldimethoxysilane, Y-methacryloyloxypropyltrimethoxysilane, Y- Methacryloyloxypropylmethylmethoxysilane or the like is used.

  Plasticizers that attack polycarbonate resin not contained in the sealing material S include phthalate esters such as dioctyl phthalate, dibutyl phthalate and butyl benzyl phthalate, phosphate esters such as tributyl phosphate and trigresyl phosphate, dibutyl adipate and adipine Aliphatic-basic acid esters such as dioctylic acid, glycol esters such as polypropylene glycol, glycerol monooleate, epoxy, fatty acid ester, trimellitic acid ester, citrate ester, chlorinated paraffin, polyester, glycolate, polypropylene adipate , Polypropylene sebacate, triacetin, tributyrin, toluenesulfonamide, alkylbenzene, biphenyl, partially hydrogenated terphenyl, camphor, etc. It is below. Among these, since phthalic acid esters attack the polycarbonate resin well, it is not particularly preferable to include them in the sealing material.

  Conversely, as a plasticizer that may be contained in the sealing material without attacking the polycarbonate resin, a polyether resin having a silyl group at the terminal, such as “Kaneka MS polymer” manufactured by Kaneka Chemical Industry Co., Examples include molecular weight acrylic polymers, alcohol-modified dicyclopentadiene, polybutene, and atactic polyolefin.

  Further, as solvents that attack polycarbonate resin not contained in the sealing material S, dioctyl phthalate, butyl benzyl phthalate, toluene, benzene, nitrobenzene, halogenated benzene, xylene, phenol, diethylenetriamine, methanol, ethyl ether, acetone, acetaldehyde, methyl ethyl ketone, methyl Isobutyl ketone, ethyl acetate, butyl acetate, vinyl acetate, carbon tetrachloride, chloroform, ethylene chloride, methylene chloride, carbon disulfide, trichloroethylene, triethanolamine, ethylenediamine, diethylenetriamine, dimethylformamide, dioxane, cyclohexanone, cyclohexene, Cyclohexanol, acrylonitrile, pyridine, ethylamine, m-amino alcohol, ethylene Roruhidorin, methyl methacrylate, styrene, Surufurin chloride, tetrahydrofuran, thiophene. Among these, toluene, benzene, and xylene are particularly unfavorable for inclusion in the sealing material because they well attack the polycarbonate resin.

  On the other hand, as a solvent that does not attack the polycarbonate resin and may be contained in the sealing material, 150 to 250 such as lower alcohol such as ethanol, hexane, ethylene glycol, or nonane, decane, dodecane, etc. Examples thereof include a solvent having a boiling point of ° C.

  The sealing material S of the present invention is a composition which contains the above organic polymer or modified silicone polymer as a main component and does not contain any of the above plasticizers or solvents which attack the polycarbonate resin. However, when the sealing material S is insufficient in plasticity, flexibility and fluidity, the above plasticizer and solvent which do not attack the polycarbonate resin are added to obtain the necessary plasticity, flexibility and fluidity. The performance as a sealing material can be secured.

  Furthermore, if necessary, a filler, a curing agent, a tackifier resin, an antioxidant, an ultraviolet absorber, a pigment, a dye, a surfactant, a diluent, an adhesion promoter, a farther agent, a stabilizer, a moisture absorber, A foaming agent or the like is added.

Examples of the filler include calcium carbonate, clay, talc, titanium oxide, zinc white, silica, diatomaceous earth, barium sulfate, kaolin, aluminum silicate, zinc oxide, carbon black, glass balloon, and plastic balloon.
Curing agents include organic tin compounds such as dibutyltin dilaurate and dioctyltin malate, amine compounds such as dibutylamine-2-ethylhexaate, compounds of acidic phosphates and amines, polyvalent carboxylic acids, tetrabutyl Organic titanate compounds such as titanate and triethanolamine titanate, and acidic phosphates are used.

  The sealing material S thus obtained is the other member disposed on the water side of the roof plate material 4 after the polycarbonate resin roof plate material 4 on which the photocatalyst layer 44 is formed is placed on the roof frame. The outer wall W and the upper horizontal rail 11 and the roof plate member 4 and the upper horizontal rail 11 (other members) are filled and sealed in a watertight manner. Note that the sealing material S may also be used for watertight sealing at the joint portion between the roof plate materials.

  When the main component of the sealing material S is an organic polymer, unreacted monomers, low molecular weight oligomers and the like are precipitated from the sealing material S. However, since these are decomposed by the photocatalyst layer 44, they are separated from the sealing material S2. Even if it deposits and adheres to the periphery of the material, or flows down from the sealing material S1 and adheres to it, the photocatalytic function is exerted to decompose and maintain hydrophilicity.

  On the other hand, when the main component of the sealing material S is a modified silicone polymer, the low molecular weight silicone oil does not precipitate, and even if it is deposited, the amount of silicon is so small that it is decomposed by the photocatalyst layer 44 and sealed. The photocatalytic function is exhibited and the hydrophilicity is maintained even if it is around or even if it flows down from the sealing material S1.

  Since the sealing material S contains neither a plasticizer nor a solvent that attack the polycarbonate resin, the sealing material S is attached to the roof plate material 4 and the upper horizontal rail 11 so as to adhere to the roof plate material 4 made of polycarbonate resin. Even if it fills, the said sealing material S2 does not generate | occur | produce a crack in the roof board | plate material 4 made from a polycarbonate resin.

  In each of the above embodiments, the sealing material S is filled and sealed in a watertight manner at two joint portions between the outer wall W and the upper horizontal rail 11 and two joint portions between the roof plate material 4 and the upper horizontal rail 11. Even when only one of them is filled, it is necessary to use the sealing material S. Moreover, even if it is another location, it is preferable to use the sealing material S of this invention, when it is the location which touches the roof board | plate material 4 or is located on the water side. Note that the sealing material of the present invention can also be used when connecting other parts such as underwater.

  Moreover, although the said embodiment is a case of the roof structure of a terrace, it can be used for various roof structures, such as another balcony, a carport, and an arcade. In addition, the building's building materials such as windshields and roofing materials installed on the verandas and corridors of apartments, walkways, organic window glass, and railway station platforms, or highway soundproofing boards, general roads and sidewalks. Resin with photocatalytic function made of polycarbonate resin used outdoors such as partitioning side wall materials, soundproof boards standing on the shoulders of ordinary roads, road materials such as waistboards and roofing materials of footbridges, signage materials, outdoor display materials, etc. Also in the construction structure of various uses using members, it is necessary to use the sealing material of the present invention, and the use and structure are not particularly limited.

Hereinafter, specific description will be made based on examples.
(Production of polycarbonate resin plate with photocatalytic function)
A commercially available photocatalyst layer coating containing fine powder of photocatalytic titanium oxide and silica was applied to one side of a polyethylene terephthalate film so that the thickness (dry) was 30 nm, and dried in an atmosphere of 100 ° C. for 30 minutes Solidified to form a photocatalytic layer. On this photocatalyst layer, a protective layer coating prepared by uniformly mixing polydimethylsiloxane and acrylic resin was applied to a thickness of 1 μm (dry), and dried in an atmosphere of 100 ° C. for 30 minutes. -Solidified to form a protective layer. Furthermore, on this protective layer, an adhesive layer coating material in which an acrylic adhesive and an ultraviolet absorber are uniformly mixed is applied to a thickness of 3 μm (dry), and dried and solidified in an atmosphere of 100 ° C. for 30 minutes. A transfer film was prepared by forming an adhesive layer.

  The upper surface of a 3 mm thick plate-like polycarbonate substrate (manufactured by Takiron Co., Ltd.) is overlaid so that the adhesive layer of the transfer film is on the polycarbonate substrate side, under conditions of a temperature of 270 ° C. and a pressure of 2 MPa. After thermocompression bonding, the transfer film adhesive layer, protective layer, and photocatalyst layer are transferred onto the surface of the polycarbonate substrate, the polyethylene terephthalate film is peeled off, and a polycarbonate resin plate with a plate-like translucent photocatalyst layer (photocatalyst polycarbonate plate) Was made.

[Example 1]
On the surface of the photocatalyst layer of the photocatalyst polycarbonate plate produced as described above, a modified silicone sealing material “Super Seal” that does not contain a plasticizer and a solvent that attacks the polycarbonate resin manufactured by Cemedine Co., Ltd. is applied in a letter-shaped manner. The obtained test piece 1 was obtained.
The water contact angle of the test piece 1 was irradiated with 1 mW / cm ² ultraviolet light for 1 week with a black light blue (BLB) lamp, and then an image processing contact angle meter [Kyowa Interface Science Co., Ltd., CA-A] was used. As a result, the two locations A and B were approximately the same as 5 °, as shown in Table 1, at a location A 10 cm away from the sealing material and a location B 2 cm away. Further, when the wettability was observed by sprinkling water on the surface of the photocatalyst layer of the test piece 1, it was sufficiently wetted to show hydrophilicity.

Further, after the test piece 1 was left outdoors for 3 months, the water contact angles at two locations A and B of the test piece 1 were measured in the same manner as before, and both of the two locations A and B were 5 It was the same as °, and it showed hydrophilicity even when the sprinkled state was observed.
Further, the photocatalyst polycarbonate plate was bent at a curvature radius of 300 mm, and the above-mentioned “super seal” was applied to the bent portion to obtain a bending test piece 2. And when the external appearance around the sealing material of this bending test piece 2 was observed, the crack did not generate | occur | produce. Furthermore, when this bending test piece 2 was put in a thermostatic chamber at 60 ° C. and the time until cracks were generated was measured, no cracks were generated even after 3 months (2160 hours).

[Comparative Example 1]
On the surface of the photocatalyst layer of the photocatalyst polycarbonate, a test piece 3 was applied in the same manner as in Example 1 by applying a urethane sealing material “Seacaflex 221” containing toluene, which is a solvent that attacked polycarbonate resin manufactured by Nippon Seika Co., Ltd. Obtained.
In the same manner as in Example 1, this test piece 3 was measured for water contact angles at two locations, A and B, and 2 A and B after being left outdoors in the same location as Example 1 for 3 months. The water contact angle of the location was measured, and the water spray state was observed. Furthermore, the bending test piece 4 which was bent to a radius of curvature of 300 mm and coated with “SEIKAFLEX 221” was observed for the occurrence of cracks, and the time until the cracks occurred in the temperature-controlled room was measured. These results are shown together in Table 1.

[Comparative Example 2]
On the surface of the photocatalyst layer of the photocatalyst polycarbonate, a test piece 5 in which a silicone sealing material “Silicone Sealant 8050” manufactured by Cemedine Co., Ltd. was applied in the same manner as in Example 1 was obtained.
In the same manner as in Example 1, the test piece 5 was measured for water contact angles at two locations, A and B, and 2 A and B after being left outdoors in the same location as in Example 1 for 3 months. The water contact angle of the location was measured, and the water spray state was observed. In the observation of the sprinkling state, the location A after standing outdoors showed hydrophilicity, but the location B showed hydrophobicity by repelling water, so the distance from the sealing material to the hydrophobic location was determined. It was 6 cm when measured. Further, the bending test piece 6 which was bent to a radius of curvature of 300 mm and coated with “silicone sealant 8050” was observed for the occurrence of cracks and the time until cracks were generated in the temperature-controlled room was measured. These results are shown together in Table 1.

  From Table 1, Example 1 and Comparative Example 1 show that the water contact angle is 5 ° at the A place as well as the B place around the sealing material, both before and after standing outdoors. It was found that the photocatalytic function was exhibited. However, in Comparative Example 2, after being left outdoors, the portion A exhibited hydrophilicity, but the portion B exhibited hydrophobicity and the photocatalytic function was not exhibited. This is considered to be because silicone oil precipitated from the silicone sealant used in Comparative Example 2 and flowed out to about 6 cm.

Further, the bending test pieces 2 and 6 of Example 1 and Comparative Example 2 did not generate cracks even immediately after application of the sealing material or after 2160 hours (3 months) in the temperature-controlled room. It has been found that no problem arises even if the substrate is made of polycarbonate. However, in the bending test piece 4 of Comparative Example 1, cracks did not occur immediately after application of the sealing material, but cracks occurred after 168 hours (one week) had passed in the temperature-controlled room. This is presumably because toluene contained in the urethane sealing material used in Comparative Example 1 reached the polycarbonate resin of the base material through the photocatalyst layer and attacked the resin.
From this result, it was found that the sealant that can be actually used without deteriorating the photocatalytic function of the photocatalytic polycarbonate and without causing cracks is the “super seal” used in Example 1.

It is sectional drawing which shows the polycarbonate resin roof structure which concerns on one Embodiment of the construction structure of this invention. It is sectional drawing which expands and shows a part of same polycarbonate resin roof structure. It is an enlarged cross-sectional view of a polycarbonate resin member (roof board material)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Horizontal beam 11 Upper horizontal beam 12 Lower horizontal beam 2 Vertical beam 3 Post 4 Roof board material (polycarbonate resin member)
S Sealing material

Claims (2)

A curved polycarbonate resin member formed by forming a photocatalyst layer on the surface of a polycarbonate resin base material and other members contain an organic polymer or a modified silicone polymer as a main component and a plasticizer and a solvent that attack the polycarbonate resin. a building structure ing to seal with no sealing material,
A construction structure, wherein the photocatalyst layer has a thickness of 5 to 35 nm, and the radius of curvature of the polycarbonate resin member is 250 mm or more. A plasticizer mainly composed of an organic polymer or a modified silicone polymer and corroding a polycarbonate resin between members disposed above the curved polycarbonate resin member formed by forming a photocatalyst layer on the surface of the polycarbonate resin substrate. and a building structure to seal ing with a sealing material containing no solvent,
A construction structure, wherein the photocatalyst layer has a thickness of 5 to 35 nm, and the radius of curvature of the polycarbonate resin member is 250 mm or more.

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