JP6887225B2 - Condensation suppression sheet - Google Patents

Description

The present invention relates to a dew condensation suppressing sheet.

For example, as is often seen in winter, when the temperature difference between the outside and the inside becomes large, dew condensation occurs on the window glass. This phenomenon occurs because the window glass is cooled by the outside air, while the room is heated by heating, etc., and when the warm air in the room hits the cold window glass, it is cooled and the air in the vicinity of the window glass is cooled. This is because the water vapor condenses into water droplets and adheres to the window glass.

Condensation occurs not only on the glass surface but also on the frame made of metal that holds the window glass, and the condensed water falls on the rail or floor surface installed under the sash by gravity. It becomes a puddle. In addition, when a curtain is attached to a window, water droplets due to dew condensation may wet the curtain. In some cases, mold or the like may be generated on the floor surface, curtains, etc., resulting in an unsanitary condition.

Therefore, it is necessary to wipe off the water droplets generated by the dew condensation, but it is very complicated and troublesome because the wiping work must be performed continuously. Therefore, various methods for suppressing dew condensation have been proposed so that such work can be avoided as much as possible. For example, a window glass is made of glass in which an air layer as a heat insulating layer is sandwiched between two pieces of glass called double glazing, or a vacuum layer is sandwiched between two pieces of glass called vacuum glass to provide vacuum heat insulating performance. It is possible to replace the glass with a glass using. However, these anti-condensation glasses are expensive and the replacement work is relatively large.

On the other hand, as a relatively simple method, there is a method of attaching a sheet for suppressing (preventing) dew condensation on the surface of the window glass and around the window glass. For example, a sheet made of polyethylene having a large number of independent air bubbles is attached to the indoor surface of the window glass, so that the air layer of the air bubbles acts as a heat insulating layer and suppresses the occurrence of dew condensation. (Patent Document 1).

Further, as another method, there is a method of suppressing dew condensation by spraying a coating solution containing a water-absorbent polymer on the surface of the window glass (Patent Document 2).

As another method, there is a method of suppressing the accumulation of dew condensation water on the rail portion or the floor surface by attaching an absorber that absorbs dew condensation water, such as a non-woven fabric, to the lower end portion of the window glass (patented). Document 3).

Japanese Unexamined Patent Publication No. 2001-227254 Japanese Unexamined Patent Publication No. 2013-177624 Japanese Unexamined Patent Publication No. 2004-223869

However, in the case of the dew condensation suppressing sheet as in Patent Document 1, when it is used for a sliding type window glass, the thickness of the bubble portion of the sheet is about 3 to 5 mm, so that one of them is used when opening and closing the window glass. The surface of the bubble portion of the sheet attached to the surface of the window glass may come into contact with the surface of the other window glass, and the sheet may be peeled off. If the sheet is peeled off, not only the dew condensation suppressing function is not exhibited, but also the opening and closing of the window glass itself may be hindered. Further, this type of dew condensation suppressing sheet is inferior in design because it looks the same as the bubble wrap used as a cushioning material at the time of packaging.

The method of Patent Document 2 is simple and does not impair the design, but the dew condensation suppressing effect does not last long because the coating is peeled off over time, and the moisture exceeding the water absorption performance of the water absorbing polymer remains on the glass surface. It remains on the glass surface and falls on the rail and floor.

In the method of Patent Document 3, the dew condensation generated on the surface of the window glass cannot be suppressed, and the texture of the absorber is set as large as ^{180 to 400 g / m 2 in order to enhance the absorption capacity of the dew condensation water.} Therefore, as with the sheet having a bubble portion, when the window glass is opened and closed, the absorber attached to one window glass may come into contact with the surface of the other window glass, which may cause the sheet to peel off. is there. Further, when such an absorber is attached to the rail portion, the window glass sash cannot be moved while attached because the absorber is thick, and the window glass itself may not be opened or closed.

Therefore, there is a demand for a method for effectively suppressing the occurrence of dew condensation without impairing the design and the function of the window glass body, but such a method has not yet been developed. ..

Therefore, a main object of the present invention is to provide a dew condensation suppressing sheet capable of effectively suppressing the occurrence of dew condensation without significantly impairing the design and function of the attached body.

As a result of intensive research in view of the problems of the prior art, the present inventor has found that the above object can be achieved by adopting a specific layer structure, and has completed the present invention.

That is, the present invention relates to the following dew condensation suppressing sheet.
1. 1. A sheet for mounting on a surface where condensation may occur.
(1) The sheet contains a water-repellent layer formed on a part or all of the base film and its surface, and (2) the water-repellent layer contains hydrophobic fine particles having an average primary particle diameter of 3 to 100 nm. ,
(3) Attach the sheet so that the back surface of the base film comes into contact with the surface where dew condensation can occur.
A dew condensation suppression sheet characterized by this.
2. Item 2. The dew condensation suppressing sheet according to Item 1, wherein the hydrophobic fine particles form a porous layer having a three-dimensional network structure.
3. 3. Item 2. The dew condensation suppressing sheet according to Item 1, which has light transmission property.
4. Item 2. The dew condensation suppressing sheet according to Item 1, wherein the surface on which dew condensation can occur includes the indoor surface of the window glass.
5. A kit used for windowpanes and frames that hold them.
(1) The dew condensation suppressing sheet according to the above item 1 for attaching to the indoor surface of the window glass, and (2) a dew condensation suppressing sheet for attaching to the indoor surface of the frame. Kit for.
6. A method for suppressing dew condensation on a surface where dew condensation can occur, which comprises a step of attaching the dew condensation suppressing sheet according to Item 1 to the surface.
7. A product in which the dew condensation suppressing sheet according to Item 1 is attached to a surface on which dew condensation may occur.

According to the present invention, it is possible to provide a dew condensation suppressing sheet capable of effectively suppressing the occurrence of dew condensation without significantly impairing the design and function of the attached body. That is, since the dew condensation suppressing sheet of the present invention can be designed with a relatively thin thickness and preferably with good transparency, it substantially has the original design and function of the attached body such as a window glass. While maintaining it, it can exert an excellent dew condensation suppressing effect.

It is a figure which shows the basic layer structure of the dew condensation suppression sheet of this invention. It is a figure which shows the state which attaches the dew condensation suppression sheet of this invention to the indoor side of a window glass. It is a figure which shows the kit of this invention and the installation example thereof.

1. 1. Condensation suppression sheet The dew condensation suppression sheet of the present invention (the sheet of the present invention) is a sheet for attaching to a surface where dew condensation may occur.
(1) The sheet contains a base film and a water-repellent layer formed on a part or all of the surface thereof.
(2) The water-repellent layer contains hydrophobic fine particles having an average primary particle diameter of 3 to 100 nm.
(3) Attach the sheet so that the back surface of the base film comes into contact with the surface where dew condensation can occur.
It is characterized by that.

FIG. 1 shows the basic structure (layer structure) of the sheet of the present invention. In the sheet 10 of the present invention, the water-repellent layer 12 is formed on at least a part of the surface (upper surface) of the base film 11. FIG. 2 shows a state in which the sheet of the present invention is attached to the indoor surface of the window glass as a surface (surface to be processed) where dew condensation can occur in the attached body which is an article to which the sheet of the present invention is attached. The sheet 10 of the present invention is attached so that the base film 11 of the sheet of the present invention (the lower surface of the sheet of the present invention) abuts on the indoor surface of the window glass 20. That is, the sheet 10 of the present invention is attached so that the water-repellent layer 12 is exposed as the outermost surface. By mounting in this way, the indoor surface of the window glass is covered with the water-repellent layer 12, but dew condensation does not occur or is less likely to occur on the water-repellent layer 12, and as a result, the window glass surface Condensation can be suppressed or prevented. As described above, in the sheet of the present invention, the water-repellent layer 12 functions as a so-called dew condensation suppressing layer.

In FIG. 2, the treated surface and the base film are in close contact with each other without gaps, but there may be gaps within a range that does not interfere with the effects of the present invention.

Although not shown in FIG. 2, the sheet of the present invention can be attached by using a known fixing means such as an adhesive tape (adhesive) or a magnet. In this case, the fixing means may be provided over the entire surface of the sheet of the present invention, or may be provided on a part (for example, four corners) of the sheet of the present invention (see, for example, FIG. 3B).

The sheet of the present invention is relatively thin, and for example, the total thickness can be set to about 25 to 110 μm. As a result, the original design and function of the attached body can be more effectively maintained.

Hereinafter, the base film, the water-repellent layer, and the like that form the basic structure of the sheet of the present invention will be described in detail.

Base film The base film is not particularly limited as long as it has a film-like form, and can be appropriately selected depending on the place where it is attached and the like. For example, any of synthetic resin, rubber, metal and the like may be used, but synthetic resin can be particularly preferably used. The synthetic resin is not particularly limited, and examples thereof include polyester-based resin, polyethylene-based resin, polypropylene-based resin, acrylic-based resin, methacrylic-based resin, and polyurethane-based resin.

In the present invention, it is preferable to use a transparent base film (particularly a synthetic resin film), particularly when the treated surface is required to be transparent like a window glass.

As the base film, in addition to a film composed of a single layer, a laminated sheet formed by laminating films of the same type or different types from each other, a composite sheet in which a metal vapor deposition layer is formed on the film, or the like can be adopted. ..

The thickness of the base film is not particularly limited and may be appropriately set, but usually it may be about 25 to 100 μm, and particularly preferably 38 to 75 μm. Within this range, while the stiffness of the sheet of the present invention can be maintained, it is advantageous in that it is relatively lightweight and easy to attach.

Water-repellent layer The water-repellent layer is formed on at least a part of the surface (upper surface) of the base film. That is, as described above, the water-repellent layer may be formed on the entire surface of the base film, or may be formed only on a part of the surface of the base film. However, it is preferable that the base film is formed on the entire surface of the base film because the effect of suppressing dew condensation on the entire sheet of the present invention is improved.

On the other hand, when the water-repellent layer is formed on a part of the surface of the base film, for example, in order to superimpose the water-absorbing sheet described later on a part of the surface of the base film on which the water-repellent layer is formed. It is also possible to provide a region in which the water-repellent layer is not formed in the region where the water-absorbent sheet of the base film is attached. In the sheet of the present invention, water-repellent layers may be formed on both sides of the base film, if necessary.

The water-repellent layer contains hydrophobic fine particles having an average primary particle diameter of 3 to 100 nm. Hydrophobic fine particles serve as an active ingredient for exhibiting the water repellency of the water repellent layer.

The hydrophobic fine particles may be attached to the base material by the force of the hydrophobic fine particles themselves, or may be attached to the base film via the adhesive layer. The hydrophobic fine particles may contain primary particles, but it is desirable that the hydrophobic fine particles contain a large amount of aggregates (secondary particles). In particular, it is more preferable that the hydrophobic fine particles contain a porous layer having a three-dimensional network structure. That is, it is preferable that a porous layer having a three-dimensional network structure formed of hydrophobic fine particles is laminated on the other surface of the base film.

The thickness of the water-repellent layer can be appropriately set according to the desired dew condensation suppressing performance and the like, but is usually about 0.1 to 5 μm, and particularly preferably about 0.2 to 2.5 μm.

Further, in the dew condensation suppressing sheet of the present invention, the contact angle between the water repellent layer and pure water is preferably 140 ° or more, more preferably 150 ° or more, and further preferably 160 ° or more. When the contact angle is 140 ° or more, the water repellency becomes high, and as a result, a more excellent dew condensation suppressing effect is provided. The upper limit of the contact angle is not particularly limited, but is usually about 175 °.

The hydrophobic fine particles constituting the water-repellent layer usually have an average primary particle diameter of 3 to 100 nm, preferably 5 to 50 nm, and more preferably 5 to 20 nm. By setting the average diameter of the primary particles in the above range, the hydrophobic fine particles are in an appropriate agglomerated state, and a gas such as air can be retained in the voids in the agglomerates, resulting in high water repellency. It will have an excellent dew condensation suppressing effect. In the present invention, the measurement of the average diameter of the primary particles can be performed with a scanning electron microscope (FE-SEM), and when the resolution of the scanning electron microscope is low, other electrons such as a transmission electron microscope are used. It may be carried out in combination with an electron microscope. Specifically, when the particle shape is spherical, the diameter is regarded as the diameter, and when the particle shape is non-spherical, the average value of the longest diameter and the shortest diameter is regarded as the diameter, and 20 particles arbitrarily selected by observation with a scanning electron microscope or the like are regarded as the diameter. Let the average of the particle diameters of the primary particles be the average diameter of the primary particles.

Although not a specific surface area of the hydrophobic fine particles (BET method) is not particularly limited, and usually 50 to 300 m ² / g, it is preferable that the particular 100 to 300 m ² / g.

The hydrophobic fine particles are not particularly limited as long as they have hydrophobicity, and various particle surfaces may be made hydrophobic by surface treatment. Therefore, even if the fine particles have hydrophilicity, they can be used as hydrophobic fine particles when the surface is treated with a silane coupling agent or the like to make the surface state hydrophobic.

Examples thereof include resin particles containing fluorine such as polyfluoroacrylic methacrylate resin, metal oxide particles, and metal particles hydrophobized by surface treatment. Among them, it is preferable to use metal oxide particles from the viewpoint of easy availability and handling.

The metal oxide particles are not limited as long as the surface thereof has hydrophobicity, and for example, particles (powder) such as silicon oxide (silica), titanium oxide (titania), aluminum oxide (alumina), zinc oxide, etc. At least one type can be preferably used. In the present invention, at least one of silicon oxide particles, titanium oxide particles and aluminum oxide particles is particularly preferable. As these metal oxide particles themselves, known or commercially available ones can be used. For example, as silica, the product names are "AEROSIL R972", "AEROSIL R972V", "AEROSIL R972CF", "AEROSIL R974", "AEROSIL RX200", "AEROSIL RY200" (all manufactured by Nippon Aerosil Co., Ltd.), "AEROSIL R202". , "AEROSIL R805", "AEROSIL R812", "AEROSIL R812S", (all manufactured by Evonik Degussa) and the like. Examples of titania include the product name "AEROXIDE TiO ₂ T805" (manufactured by Evonik Degussa). Examples of alumina include fine particles obtained by treating the product name "AEROXIDE Alu C" (manufactured by Evonik Degussa) with a silane coupling agent to make the particle surface hydrophobic.

Among these, hydrophobic silicon oxide fine particles can be preferably used. In particular, hydrophobic silicon oxide fine particles having a trimethylsilyl group on the surface are preferable in that more excellent water repellency can be obtained. Examples of commercially available products corresponding to this include the above-mentioned "AEROSIL R812" and "AEROSIL R812S" (both manufactured by Evonik Degussa).

Adhesion amount of the hydrophobic fine particles to be contained in the water-repellent layer (weight after drying) is not limited, it may preferably be usually 0.01 to 10 g / ^{m 2,} to a 0.2 to 3 g / ^{m 2} Is more preferable, and 0.3 to 1 g / m ² is most preferable. By setting it within the above range, more excellent water repellency can be obtained for a long period of time, and it is more advantageous in terms of suppression of dropping of hydrophobic fine particles, cost and the like.

The hydrophobic fine particles adhering to the water-repellent layer preferably form a porous layer having a three-dimensional network structure, and the thickness thereof is preferably about 0.1 to 5 μm, preferably about 0.2 to 2.5 μm. More preferred. By adhering in such a porous layer state, a large amount of air can be contained in the layer, and as a result, the water repellency becomes high, and thus an excellent dew condensation suppressing effect can be exhibited.

The method for forming the hydrophobic fine particles directly on the surface of the base film is not particularly limited. Known methods such as roll coating, gravure coating, bar coating, doctor blade coating, dipping, brush coating, spray coating, and powder electrostatic coating can be adopted. After forming the adhesive layer on the base film, a drying step may be performed if necessary. Further, when forming the base film, a dispersion in which hydrophobic fine particles are dispersed in a solvent may be used to form the base film on the surface. The solvent in this case is not particularly limited, and in addition to water, an organic solvent such as a hydrophilic solvent or a hydrophobic solvent can be used. Examples of the organic solvent include alcohols such as ethanol and isopropyl alcohol, ketones such as acetone and methyl ethyl ketone, glycols such as propylene glycol, hexylene glycol, butyl diglycol and pentamethyl glycol, and glycol ether such as propylene glycol monomethyl ether. Kind, alicyclic hydrocarbons such as cyclohexane, alkanes such as n-hexane, aromatic hydrocarbons such as toluene and benzene can be used.

When the hydrophobic fine particles are attached to the surface of the base film via the adhesive layer, a known or commercially available adhesive can be used as the adhesive layer. For example, adhesives such as polyolefin resins, polyester resins, polyurethane resins, epoxy resins, acrylic resins, vinyl resins and the like can be mentioned. More specifically, low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear (linear) low-density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionoma-resin, ethylene-acrylic acid copolymer. , Ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, ethylene-propylene copolymer, methylpentene polymer, polybutene polymer, polyolefin-based such as polyethylene or polypropylene Acid-modified polyolefin resin modified with unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, polyvinyl acetate resin, poly (meth) acrylic resin, In addition to polyacrylonitrile resins, polyvinyl chloride-based resins, and other heat-adhesive resins, blended resins thereof, copolymers containing a combination of monomers constituting these, modified resins, and the like can be used.

Further, anchor coating agents such as polyurethane, polyisocyanate / polyether polyol, polyisocyanate / polyalkylene ether, polyethyleneimine, and alkyl titanate can also be used.

By forming a thermoplastic resin as an adhesive layer on the surface of the base film and softening the surface of the thermoplastic resin, a part or all of the hydrophobic fine particles can be embedded in the thermoplastic resin. It can also adhere to. Further, if the surface of the base film is coated with the thermoplastic resin in a molten state and then the hydrophobic fine particles are added before cooling and solidifying, the hydrophobic fine particles can be directly adhered to the surface of the base film.

In the present invention, in any aspect, a trace amount of dispersant, colorant, sedimentation inhibitor, viscosity regulator and the like can be used in combination in the adhesive layer (adhesive).

As described above, the dew condensation suppressing sheet has a water-repellent layer containing hydrophobic fine particles formed on at least a part of the other surface of the base film. As a result, when attached to a surface to be treated such as window glass where dew condensation is likely to occur, dew condensation does not occur on the surface of the dew condensation suppression sheet, or even if dew condensation occurs, very fine water droplets are formed. Since it stays, the amount of dew condensation is very small, so it has an excellent dew condensation suppressing effect. The reason why dew condensation is suppressed in such a configuration is not clear, but it is presumed that there are at least the following two reasons, a) and b). Then, in the present invention, it is presumed that the synergistic action of these plurality of factors provides an excellent dew condensation suppressing effect.

a) Since the water-repellent layer contains hydrophobic fine particles having an average primary particle diameter of 3 to 100 nm, the hydrophobic fine particles are in an appropriate aggregated state, and a gas such as air can be retained in the voids in the aggregate. .. Therefore, when the dew condensation suppressing sheet of the present invention is attached to the window glass, it is presumed that dew condensation is less likely to occur because the air held by the agglomerated state of the hydrophobic fine particles functions as a heat insulating layer.

b) When dew condensation occurs, water molecules in the air adhere to the glass surface where dew condensation occurs, and water molecules adhering to the vicinity attract each other to form a nucleus, and this nucleus gradually becomes a nucleus. It is thought that water droplets will eventually occur when the glass becomes large. On the other hand, since it is difficult for water molecules to adhere to the highly water-repellent surface such as the water-repellent layer of the sheet of the present invention, it is presumed that it is difficult to form a nucleus that is a source of dew condensation. To.

2. Use of Condensation Suppressing Sheet The sheet of the present invention can be attached to any surface where dew condensation can occur. The surface (surface to be treated) where dew condensation can occur in the attached body is not particularly limited as long as it is a place / part where dew condensation is likely to occur, such as a place where the temperature is low or a place where the humidity is high. The indoor side of the sash), the indoor side of the entrance door, the wall of the bathroom or washroom (side, ceiling), the wall of the kitchen, the wall of the toilet, the back of furniture such as closets and tans, or near the back. An example is a wall surface. The present invention also includes products in which the sheet of the present invention is attached to these surfaces. A typical example of such a product is a window glass product obtained by attaching and fixing the sheet of the present invention so that the base film comes into contact with the indoor surface of the window glass.

Various methods can be adopted for attaching the sheet of the present invention to the surface to be processed. For example, a) a method in which an adhesive layer is formed in advance on the surface opposite to the surface on which the water-repellent layer of the base film constituting the dew condensation suppressing sheet is formed, and the adhesive layer is used for attachment. A method of attaching a dew condensation suppression sheet by pasting a double-sided sheet on a part of the surface, c) a method of attaching from the surface of the dew condensation suppression sheet on the water-repellent layer side with adhesive tape, d) If a magnet can be used on the surface to be treated Examples thereof include a method of attaching with a magnet from the surface of the dew condensation suppressing sheet on the water-repellent layer side.

In the present invention, when the surface to be treated is a window glass sash, the design (appearance), opening / closing function, etc. of the window glass sash can be obtained by using it as a dew condensation suppressing kit including the above-mentioned dew condensation suppressing sheet and the water absorbing sheet described later. It is possible to install the glass without significantly damaging it, and it is possible to more effectively suppress the occurrence of dew condensation.

Such a kit may be applied to, for example, a) a window glass sash composed of a window glass and a frame body for holding the window glass, b) a structure composed of a window glass sash and a rail portion installed under the frame body, and the like. Can be done. In this case, the sheet of the present invention is applied to the window glass, and the water absorbing sheet is applied to the other parts.

The water-absorbing sheet constituting the dew condensation suppressing kit of the present invention has an effect of insulating the frame body and also has an effect of absorbing dew condensation generated on the frame body. As described above, by using the sheet of the present invention and the water absorbing sheet together, it is possible to more effectively suppress the occurrence of dew condensation.

The water absorbing sheet is not particularly limited as long as it is a material capable of absorbing dew condensation (water droplets). For example, any of a non-woven fabric, a porous sheet (sponge, etc.), a water-absorbing polymer sheet, and the like can be adopted. Among them, it is preferable to use a non-woven fabric from the viewpoints of easy availability, ease of handling, cost and the like.

As the non-woven fabric, any non-woven fabric made of natural fibers, synthetic fibers or a mixture thereof can be used. The material of the fiber constituting the non-woven fabric is not limited, and as long as it is a synthetic fiber, for example, polyester fiber, polypropylene fiber, polyamide fiber, polyimide fiber, cellulose fiber such as rayon and the like can be used.

The basis weight of the non-woven fabric is not limited, but the basis weight is particularly preferably ^{50 to 180 g / m 2.} By setting the grain within this range, for example, when the water absorbing sheet is attached to the rail part, the water absorbing sheet covering the rail part can be made very thin, so the window glass sash can be opened and closed with the water absorbing sheet attached to the rail part. Even if the rail portion is moved for this purpose, dew condensation (water droplets) can be absorbed without impairing the design and opening / closing function of the window glass sash.

In the present invention, an antifungal agent, an antibacterial agent, or the like may be contained in the surface of the water absorbing sheet or its material, if necessary. Further, in addition to a resin film such as polyester or polyethylene, a non-water-absorbent sheet such as a metal foil may be laminated on one side of the water-absorbent sheet. Further, lines, characters, patterns and the like indicating the cutting position and the scale may be appropriately printed on the surface of the water absorbing sheet.

An adhesive layer may be formed on one surface of the water absorbing sheet in order to attach the water absorbing sheet to the frame body holding the window glass or the rail portion installed on the lower side of the frame. Further, instead of forming the adhesive layer, it can be attached with double-sided tape or the like.

In the kit of the present invention, as described above, the sheet of the present invention may be attached to the indoor surface of the window glass, and the water absorbing sheet may be attached to the indoor surface of the frame and the rail portion. The mounting method itself may be carried out by a known method. For example, when it is attached to a window glass sash, it can be attached in the manner described below.

The window glass sash is composed of a window glass and a frame body for holding the window glass. First, the above-mentioned dew condensation suppressing sheet is attached to the window glass other than the frame body. Then, a water absorption sheet is attached to the frame body. Further, the water absorbing sheet may be attached not only to the frame but also to the rail portion installed under the window glass sash. The water absorption sheet may be attached to the rail portion on either the bottom surface or the side surface of the recess of the rail portion.

As described above, attaching the dew condensation suppressing sheet to the window glass has the effect of suppressing dew condensation. However, in the present invention, the dew condensation generated on the entire window glass sash by attaching the water absorbing sheet to the frame body. It becomes possible to further suppress the amount of.

Usually, the frame for holding the window glass is often made of metal such as aluminum. When the frame is made of metal, the frame has higher thermal conductivity than the window glass, so that it is more susceptible to temperature changes and dew condensation is more likely to occur than the window glass portion. On the other hand, when the water absorbing sheet is attached to the frame body, dew condensation is less likely to occur on the surface of the frame body due to the heat insulating effect of the water absorbing sheet. In addition, when nothing is attached to the window glass sash, the amount of dew condensation generated per unit area tends to be larger in the frame than in the glass, but in the glass, the peripheral part of the frame tends to be larger than the central part. The amount of dew condensation tends to be large. The reason for this is not clear, but probably the glass around the frame is more susceptible to temperature changes than the glass in the center due to the influence of the metals that make up the frame, so condensation is more likely to occur. It is inferred that. In this case, by attaching a water absorbing sheet to the frame body and covering it with the kit of the present invention, dew condensation is less likely to occur on the frame body itself due to its heat insulating effect, and the temperature change of the glass around the frame body is suppressed, so that dew condensation occurs. Occurrence is suppressed. It is presumed that these synergistic actions can more effectively suppress the dew condensation on the entire window glass sash.

Examples and comparative examples are shown below, and the features of the present invention will be described more specifically. However, the scope of the present invention is not limited to the examples.

Example 1
The dew condensation suppressing sheet and the water absorption sheet of the present invention were produced as follows, respectively, to obtain a kit according to the present invention.
(1) Preparation of Condensation Suppressing Sheet A polyester film having a thickness of 38 μm (hereinafter referred to as “PET film”) was prepared as a base film. Next, a water-repellent layer was formed on one side of this PET film.
First, a thermoplastic resin solution (main component: 160 parts by weight of polyester resin + 10 parts by weight of acrylic resin + 40 parts by weight of solvent (mixed solvent of toluene + MEK)) is dried on one side of a PET film, and then weighs about 3 g / m ^2. A thermoplastic resin layer was formed by coating and drying (drying conditions: 150 ° C. for 10 seconds).
Next, 5 g of product name "AEROSIL R812S" (manufactured by Evonik Degussa, BET specific surface area: 220 m ² / g, primary particle average diameter: 7 nm) was dispersed as hydrophobic fine particles in 100 mL of ethanol to prepare a coating solution. This coating liquid is applied to the surface of the thermoplastic resin layer by a ^{bar coating method so as to have a weight of 0.11 to 0.4 g / m 2} after drying, and then dried at 100 ° C. for about 10 seconds to ethanol. Was evaporated. As a result, a water-repellent layer was formed on one side of the PET film. In this way, the sheet of the present invention was obtained.

(2) Preparation of Water Absorption Sheet A ^{non-woven fabric having a basis weight of 100 g / m 2} (material: made of rayon) was prepared, and this non-woven fabric was laminated on one side of a polyethylene film having a thickness of 15 μm by extrusion lamination. After printing the pattern on the other side of the non-woven fabric, the entire surface is coated with an overcoat (7% by weight based on the "Novalon VZF200" solvent manufactured by Towa Synthetic Co., Ltd.) containing an antibacterial agent to prevent discoloration. , Dried at 100 ° C. for 1 minute. A pressure-sensitive adhesive solution made of acrylic resin was applied to the surface of the release paper for adhesive processing on which the silicon resin was formed, with a coater machine so that the layer thickness after drying was 24 to 45 μm. After that, the release paper coated with the pressure-sensitive adhesive solution was dried to obtain a release paper with an adhesive layer having an adhesive layer formed on one side. Next, what is the surface on which the non-woven fabric of the polyethylene film is laminated? A water-absorbing sheet was prepared by laminating the opposite surface and the surface of the release paper with the adhesive layer prepared above on the adhesive layer side.

Comparative Example 1
A 38 μm-thick PET film without a water-repellent layer was used as the base film, and the sheet of Comparative Example 1 was prepared. Further, the water-absorbing sheet of Comparative Example 1 was produced in the same manner as the water-absorbing sheet produced in Example 1 except that the non-woven fabric having ^{a basis weight of 180 g / m 2 was used as the water-absorbing sheet.}

Test Example 1
The following tests were performed on Examples and Comparative Examples, respectively. The results are shown in Table 1.

(1) Condensation test A dew condensation test was carried out for each of Examples and Comparative Examples. As shown in FIG. 3A, a sliding type window is maintained in a room where the outside air temperature is 0 to 5 ° C., the indoor temperature is 20 ± 2 ° C., and the humidity is 65 ± 5% for 8 hours. The degree of dew condensation on the glass sashes 30a and 30b (composed of two pieces of a frame having a height of 190 cm and a width of 100 cm and a window glass having a height of 180 cm and a width of 90 cm) was observed.
In this test example, as shown in FIG. 3 (b), the dew condensation suppressing sheet 10 (height 180 cm, width 90 cm) and the water absorption sheet 31 of Example 1 are prepared, and the window glass sash is prepared as shown in FIG. 3 (c). It was pasted on the indoor side of the room. In addition, a water absorption sheet was also attached to a rail portion (not shown). The dew condensation suppressing sheet 10 was attached to the window glass by attaching commercially available double-sided tapes 32 (a total of 6 places per window glass) to the four corners of the dew condensation suppressing sheet 10.
Further, for comparison, the window sash was moved to the indoor side and the rail portion in the same manner as in Example 1 except that the sheet of Comparative Example 1 having the same shape and the water absorbing sheet were used instead of the dew condensation suppressing sheet of Example 1. A sheet and a water absorbing sheet were attached.
In addition, the one in which nothing was attached to any of the window glass sash and the rail portion was used as Comparative Example 2 (the same applies to the following tests).
Regarding these Examples and Comparative Examples, "○" is displayed when no visible dew condensation is generated on the window glass surface, and "△" is generated when visible dew condensation is generated but less than that of Comparative Example 2. , If dew condensation has occurred, it is marked with "x".

(2) Wearability test The mountability of the dew condensation water absorption sheet to the window glass sash and the rail was examined. In the above (1), the wearability when the dew condensation water absorption sheet and the water absorption sheet were attached was evaluated. It was evaluated as "○" when it could be mounted without any trouble such as floating from the mounting surface, "△" when a slight floating occurred, and "×" when a large floating occurred.

(3) Opening and closing function test of the window sash after mounting It was evaluated whether or not there was an obstacle in opening and closing the window glass sash after mounting the dew condensation suppressing sheet and the water absorption sheet. If it can be opened and closed without any problem, it is evaluated as "○", if it can be opened and closed with some catch, it is evaluated as "△", and if it cannot be opened and closed by being caught, it is evaluated as "×".

(4) Water repellency (contact angle with pure water)
For the sheets of Example 1 and Comparative Example 1, the contact angle (25 ° C.) of the surface of each sheet with pure water was measured. The surface of each sheet opposite to the surface to be attached to the window glass surface is used as the test surface, and pure water (about 2 to 2) is used using a contact angle measuring device (solid-liquid interface analyzer "Drop Master 300" manufactured by Kyowa Interface Science Co., Ltd.). The contact angle of 4 μl) was measured. As the measurement result, the number of N was set to 5 times, and the average value of the contact angles was used.

As is clear from the results in Table 1, according to the present invention, it can be seen that the occurrence of dew condensation can be effectively suppressed without impairing the design and the function of the window glass main body.

Claims (4)

A kit used for windowpanes and frames that hold them.
Includes (1) a dew condensation suppression sheet for attaching to the indoor side surface of the window glass and (2) a water absorbing sheet for attaching to the indoor side surface of the frame body , and
(3) The dew condensation suppressing sheet is a sheet for attaching to a surface where dew condensation can occur, and (3-1) the sheet is a base film and a repellent formed on a part or all of the surface thereof. (3-2) The water-repellent layer contains hydrophobic fine particles having an average primary particle diameter of 3 to 100 nm, and the hydrophobic fine particles form a porous layer having a three-dimensional network structure. (3-3) A dew condensation suppressing sheet, wherein the sheet is attached so that the back surface of the base film comes into contact with a surface where dew condensation can occur.
A kit for suppressing dew condensation. The dew condensation suppressing kit according to claim 1, wherein the amount of hydrophobic fine particles adhered to the dew condensation suppressing sheet is 0.01 to 10 g / m ^2. The dew condensation suppression kit according to claim 1, wherein the dew condensation suppression sheet has light transmission. The dew condensation suppressing kit according to claim 1, wherein the surface on which dew condensation can occur includes the indoor surface of the window glass.

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