JP2017019276A - Condensation suppression sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a condensation suppression sheet capable of efficiently suppressing occurrence of condensation without significantly reducing a design property and a function of an attached body.SOLUTION: A condensation suppression sheet is attached to a surface on which condensation may occur, in which (1) the sheet contains a substrate film and a water repellent layer which is formed on a part or whole body of a surface of the substrate film, (2) the water repellent layer contains hydrophobic fine particles whose primary particle average diameter is 3-100 nm, and (3) the sheet is attached in a manner in which, a rear surface of the substrate film contacts the surface on which condensation may occur.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a condensation suppression sheet.

  For example, as is often seen in the winter, when the temperature difference between the outdoors and indoors becomes large, condensation occurs on the window glass. This phenomenon is caused by the fact that the window glass is cooled by the outside air, while the room is warmed by heating, etc., and when the indoor warm air hits the cooled window glass, it is cooled, and the air in the vicinity of the window glass This is because water vapor condenses and forms water droplets and adheres to the window glass.

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

  For this reason, it is necessary to wipe off water droplets generated by dew condensation. However, since the wiping operation must be performed continuously, it is very cumbersome and troublesome. In view of this, various methods for suppressing condensation have been proposed so as to eliminate such work as much as possible. For example, a vacuum layer is sandwiched between two glasses called window glass or vacuum glass, or a glass layer in which an air layer as a heat insulation layer is sandwiched between two sheets of glass called multi-layer glass. The glass may be replaced with a glass using However, these anti-condensation glasses are expensive and the replacement work is relatively heavy.

  On the other hand, as a relatively simple method, there is a method of attaching a sheet for suppressing (preventing) condensation on the surface of the window glass and the periphery of the window glass. For example, a sheet that suppresses the occurrence of condensation by attaching a sheet made of polyethylene with a large number of independent air bubble portions to the indoor surface of the window glass so that the air layer of the air bubble portion serves as a heat insulating layer is proposed. (Patent Document 1).

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

  As another method, there is a method of suppressing the accumulation of condensed water on the rail part and the floor surface by attaching an absorber that absorbs condensed water, such as a non-woven fabric, to the lower end of the window glass (patent) Reference 3).

JP 2001-227254 A JP 2013-177624 A JP 2004-223869 A

  However, in the case of the dew condensation suppression sheet as in Patent Document 1, when used for a draw-type window glass, since the thickness of the bubble portion of the sheet is about 3 to 5 mm, when opening and closing the window glass, The bubble part surface of the sheet | seat attached to the window glass surface may contact with the other window glass surface, and a sheet | seat may peel off. When the sheet is peeled off, the function of suppressing condensation is not exhibited, and there is a possibility that the opening and closing of the window glass itself may be hindered. In addition, this type of dew condensation suppression sheet is inferior in design because it looks the same as a bubble cushioning material used as a cushioning material during packaging.

  Although the method of Patent Document 2 is simple and there is no risk of impairing the design, the coating is peeled off over time, so the dew condensation suppressing effect does not last long, and moisture exceeding the water absorption performance of the water absorbing polymer remains as it is on the glass surface. In other words, it falls on the rail surface and the floor surface over the glass surface.

In the method of Patent Document 3, dew condensation that occurs on the surface of the window glass cannot be suppressed, and the weight of the absorber is set to be as large as 180 to 400 g / m ^{2 in} order to increase the ability to absorb dew condensation water. Therefore, like a 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 other window glass surface, which may cause the sheet to peel off. is there. Moreover, when such an absorber is attached to a rail part, since the thickness of an absorber is thick, a window glass sash cannot be moved with attaching, but there exists a possibility that opening and closing of a window glass itself cannot be performed.

  For this reason, there is a need 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 condensation suppression sheet that can effectively suppress the occurrence of condensation without significantly impairing the design and function of the mounted body.

  As a result of intensive studies 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 suppression sheet.
1. A sheet for mounting on a surface where condensation can occur,
(1) The sheet includes a base film and a water repellent layer formed on a part or all of the surface thereof, and (2) the water repellent layer includes 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 abuts on the surface where condensation can occur.
Condensation suppression sheet characterized by that.
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. Item 2. The dew condensation suppressing sheet according to Item 1, which has light transmittance.
4). The dew condensation suppressing sheet according to Item 1, wherein a surface on which dew condensation can occur includes a surface on the indoor side of the window glass.
5. A kit used for a window glass and a frame for holding the window glass,
(1) Condensation suppression characterized by including the dew condensation suppression sheet | seat of said claim | item 1 for attaching to the indoor side surface of a window glass, and (2) The water absorbing sheet for attaching to the indoor side surface of a frame. For kit.
6). A method for suppressing condensation on a surface where condensation can occur, comprising a step of attaching the condensation suppression sheet according to Item 1 to the surface.
7). A product obtained by attaching the condensation suppression sheet according to Item 1 to a surface on which condensation can occur.

  ADVANTAGE OF THE INVENTION According to this invention, the dew condensation suppression sheet | seat which can suppress generation | occurrence | production of dew condensation effectively can be provided, without impairing the designability and function of a to-be-attached body significantly. That is, since the dew condensation suppressing sheet of the present invention can be designed with a relatively small thickness, preferably with good transparency, the design and function inherent to the mounted body such as a window glass are substantially provided. While maintaining, an excellent dew condensation suppressing effect can be exhibited.

It is a figure which shows the basic layer structure of the dew condensation suppression sheet | seat of this invention. It is a figure which shows the state which attaches the dew condensation suppression sheet | seat of this invention to the room inner side of a window glass. It is a figure which shows the kit of this invention, and its attachment example.

1. Condensation suppression sheet The condensation suppression sheet of the present invention (present invention sheet) is a sheet for mounting on a surface where condensation can occur,
(1) The sheet includes a base film and a water repellent layer formed on part or all of the surface thereof,
(2) The water repellent layer includes 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 abuts on the surface where condensation can occur.
It is characterized by that.

  FIG. 1 shows a basic configuration (layer configuration) of the sheet of the present invention. The sheet 10 of the present invention has a water repellent layer 12 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 side surface of the window glass as a surface (surface to be treated) on which the dew condensation can occur in the mounted body, which is an attachment article of the sheet of the present invention. The present invention sheet 10 is attached so that the base film 11 of the present invention sheet (the lower surface of the present invention sheet) comes into contact with the indoor side 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 side surface of the window glass is covered with the water-repellent layer 12, but condensation does not occur or hardly occurs on the water-repellent layer 12, and as a result, the window glass surface It is possible to suppress or prevent dew condensation on the surface. Thus, in the sheet of the present invention, the water repellent layer 12 functions as a dew condensation suppressing layer.

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

  Although not shown in FIG. 2, the fixing of the sheet of the present invention may employ 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 at 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, for example, the total thickness can be set to about 25 to 110 μm. Thereby, the design nature and function which a to-be-attached body originally has can be held more effectively.

  Hereinafter, each of the base film, the water-repellent layer and the like constituting 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 according to the place to be attached. For example, any of synthetic resin, rubber, metal and the like may be used, but synthetic resin can be particularly preferably used. Although it does not specifically limit as a synthetic resin, For example, a polyester resin, a polyethylene resin, a polypropylene resin, an acrylic resin, a methacrylic resin, a polyurethane resin etc. are mentioned.

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

  As the base film, in addition to a film composed of a single layer, any of a laminated sheet formed by laminating the same or different kinds of films and a composite sheet in which a metal vapor deposition layer is formed on the film can be adopted. .

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

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 thereof. However, it is preferable that it is formed on the entire surface of the base film since the dew condensation suppressing effect as the whole sheet of the present invention is improved.

  On the other hand, in the case where the water-repellent layer is formed on a part of the surface of the base film, for example, a water-absorbing sheet to be described later is stuck on a part of the surface of the base film on which the water-repellent layer is formed. Moreover, the area | region which has not formed the water-repellent layer can also be provided in the area | region which pastes the water absorbing sheet of a base film. In addition, in this invention sheet | seat, the water-repellent layer may be formed in both surfaces of the base film as needed.

  The structure of the water repellent layer includes hydrophobic fine particles having an average primary particle diameter of 3 to 100 nm. Hydrophobic fine particles become an active ingredient for exerting the water repellency of the water repellent layer.

  The hydrophobic fine particles may be attached to the substrate by the force of the hydrophobic fine particles themselves, or may be attached to the substrate film via an adhesive layer. The hydrophobic fine particles may contain primary particles, but it is desirable that the hydrophobic fine particles contain many aggregates (secondary particles). In particular, it is more preferable that the hydrophobic fine particles include 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 by 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, but is usually about 0.1 to 5 μm, and preferably about 0.2 to 2.5 μm.

  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 even more preferably 160 ° or more. If the contact angle is 140 ° or more, the water repellency is increased, and as a result, a better 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 primary particle diameter in the above range, the hydrophobic fine particles are in an appropriately aggregated state, and can hold a gas such as air in the voids in the aggregate, resulting in high water repellency. An excellent dew condensation suppression effect is provided. In the present invention, the average primary particle diameter can be measured with a scanning electron microscope (FE-SEM). When the resolution of the scanning electron microscope is low, other electrons such as a transmission electron microscope are used. You may carry out together with a microscope. Specifically, when the particle shape is spherical, the diameter is considered 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 arbitrarily selected by observation with a scanning electron microscope or the like. The average diameter of the particles is defined as the average primary particle diameter.

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 particle is not particularly limited as long as it has hydrophobicity, and various particle surfaces may be made hydrophobic by surface treatment. Accordingly, even fine particles having hydrophilicity can be used as hydrophobic fine particles when surface treatment is performed with a silane coupling agent or the like to make the surface state hydrophobic.

  For example, resin particles containing fluorine such as polyfluoroacryl methacrylate resin, metal oxide particles, metal particles hydrophobized by surface treatment, and the like can be given. Among these, it is preferable to use metal oxide particles from the standpoint of availability and ease of handling.

The metal oxide particles are not limited as long as the surface thereof is hydrophobic. For example, particles (powder) of silicon oxide (silica), titanium oxide (titania), aluminum oxide (alumina), zinc oxide, etc. At least one kind can be suitably used. In the present invention, at least one of silicon oxide particles, titanium oxide particles, and aluminum oxide particles is particularly preferable. These metal oxide particles themselves may be known or commercially available. For example, as silica, product names “AEROSIL R972”, “AEROSIL R972V”, “AEROSIL R972CF”, “AEROSIL R974”, “AEROSIL RX200”, “AEROSIL RY200” (above, manufactured by Nippon Aerosil Co., Ltd.), “AEROSIL R202” "AEROSIL R805", "AEROSIL R812", "AEROSIL R812S" (above, manufactured by Evonik Degussa). Examples of titania include “AEROXIDE TiO ₂ T805” (manufactured by Evonik Degussa). Examples of alumina include fine particles in which the product name “AEROXIDE Alu C” (manufactured by Evonik Degussa) is treated with a silane coupling agent to make the particle surface hydrophobic.

  Among these, hydrophobic silicon oxide fine particles can be suitably used. In particular, hydrophobic silicon oxide fine particles having a trimethylsilyl group on the surface are preferable in that superior water repellency can be obtained. Examples of commercially available products corresponding to this include “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 within the above range, more excellent water repellency can be obtained over a long period of time, and it is further advantageous in terms of reduction of hydrophobic fine particles and cost.

  The hydrophobic fine particles attached to the water repellent layer preferably form a porous layer having a three-dimensional network structure, and the thickness is preferably about 0.1 to 5 μm, and about 0.2 to 2.5 μm. Further preferred. By adhering in such a porous layer state, the layer can contain a large amount of air. As a result, the water repellency is increased, and thereby an excellent dew condensation suppressing effect can be exhibited.

  The method for directly forming the hydrophobic fine particles on the substrate film surface 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 employed. You may perform a drying process as needed after formation of the adhesion layer to a base film. Moreover, when forming on a base film, you may form on the base film surface using the dispersion which disperse | distributed hydrophobic fine particles in the solvent. The solvent in this case is not particularly limited, and an organic solvent such as a hydrophilic solvent or a hydrophobic solvent can be used in addition to water. 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 ethers such as propylene glycol monomethyl ether. And alicyclic hydrocarbons such as cyclohexane, alkanes such as n-hexane, and aromatic hydrocarbons such as toluene and benzene.

  When the hydrophobic fine particles are attached to the surface of the base film through the adhesive layer, a known or commercially available adhesive can be used as the adhesive layer. Examples thereof include adhesives such as polyolefin resins, polyester resins, polyurethane resins, epoxy resins, acrylic resins, vinyl resins, and the like. More specifically, low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer. Polyolefins such as ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, ethylene-propylene copolymer, methylpentene polymer, polybutene polymer, polyethylene or polypropylene An acid-modified polyolefin resin, a polyvinyl acetate resin, a poly (meth) acrylic resin obtained by modifying a resin with an unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, and itaconic acid, Polyacrylonitrile resin, polyvinyl chloride tree In addition to other heat-adhesive resin, it may be used blends resins, a copolymer comprising a combination of monomers constituting them, the modified resin.

  Also, anchor coating agents such as polyurethane, polyisocyanate / polyether polyol, polyisocyanate / polyalkylene ether, polyethyleneimine, alkyl titanate can 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, part or all of the hydrophobic fine particles may be buried in the thermoplastic resin. It can also adhere to. Alternatively, the hydrophobic fine particles can be directly adhered to the surface of the base film by applying the hydrophobic fine particles to the surface of the base film after applying the thermoplastic resin in a molten state until cooling and solidifying.

  In the present invention, in any of the embodiments, a trace amount of a dispersant, a colorant, an anti-settling agent, a viscosity modifier and the like can be used in combination in the adhesive layer (adhesive).

  Thus, the dew condensation suppression 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 it is attached to a treated surface such as window glass where condensation is likely to occur, the surface of the condensation suppression sheet will not cause condensation, or even if condensation occurs, very fine water droplets will be generated. Since the amount of dew condensation is very small, 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 two reasons a) and b) below. And in this invention, it is guessed that it is equipped with the outstanding dew condensation suppression effect by acting synergistically of these some factors.

  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 can hold a gas such as air in the voids in the aggregate. . Therefore, when the condensation suppression sheet of the present invention is attached to a window glass, it is presumed that condensation is less likely to occur because the air retained by the aggregation state of the hydrophobic fine particles functions as a heat insulating layer.

  b) When condensation occurs, water molecules in the air adhere to the glass surface where condensation occurs, and the water molecules adhering to nearby attract to each other to form nuclei that gradually become nuclei. It is thought that it will be generated as a water drop soon after becoming a large state. On the other hand, since water molecules are unlikely to adhere to the surface having high water repellency like the water repellent layer of the sheet of the present invention, it is presumed that nuclei that are the source of condensation are less likely to be formed. The

2. Use of Condensation Suppression Sheet The sheet of the present invention can be attached to any location as long as condensation can occur. The surface (surface to be treated) on which the condensation can occur in the mounted body is not particularly limited as long as it is a location / part where condensation is likely to occur, such as a place where the temperature is low or a place where the humidity is high. (Including sashes), indoor surfaces of entrance doors, walls of bathrooms or washrooms (sides, ceilings), kitchen walls, toilet walls, close-ups, close-ups of furniture such as chests A wall surface etc. are illustrated. In the present invention, products obtained by attaching the sheet of the present invention to these surfaces are also included. As such a product, for example, 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 side surface of the window glass can be cited as a representative example.

  Various methods can be employed 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 other side of the surface of the base film constituting the dew condensation suppressing sheet, and attached by this adhesive layer; b) the other side A method of attaching a dew condensation suppression sheet by adhering a double-sided sheet to 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 an adhesive tape, and d) when a magnet can be used on the surface to be treated The method of attaching with a magnet from the surface of the water-repellent layer side of a dew condensation suppression sheet is mentioned.

  In the present invention, when the surface to be treated is a window glass sash, by using it as a dew condensation suppression kit including the above dew condensation suppression sheet and a water absorbing sheet described later, the design (appearance), opening and closing function, etc. of the window glass sash Can be attached without significantly detracting from, and the occurrence of condensation can be more effectively suppressed.

  As such a kit, for example, a) a window glass sash composed of a window glass and a frame holding the same, and b) a structure composed of a window glass sash and a rail portion installed on the lower side of the frame. Can do. In this case, this invention sheet | seat is applied with respect to a window glass, and a water absorbing sheet | seat is applied to a part other than that.

  The water absorbing sheet constituting the dew condensation suppression 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. Thus, it becomes possible to suppress generation | occurrence | production of condensation more effectively by using this invention sheet | seat and a water absorbing sheet together.

  The water absorbent sheet is not particularly limited as long as it is a material that can absorb condensation (water droplets). For example, any of a nonwoven fabric, a porous sheet (sponge etc.), a water absorption polymer sheet, etc. can be adopted. Among these, it is preferable to use a nonwoven fabric from the viewpoints of availability, ease of handling, cost, and the like.

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

Further, the basis weight of the nonwoven fabric is not limited, but it is particularly preferable that the basis weight is 50 to 180 g / m ² . By setting the basis weight within this range, for example, when attaching a water absorbent sheet to the rail part, the water absorbent sheet covering the rail part can be made very thin, so the window glass sash can be opened and closed with the water absorbent sheet attached to the rail part. Therefore, even if it is moved on the rail portion, dew condensation (water droplets) can be absorbed without impairing the design and opening / closing function of the window glass sash.

  In the present invention, if necessary, an antifungal agent, an antibacterial agent, or the like may be included in the surface of the water absorbent sheet or in the material thereof. 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. Furthermore, a line, a character, a pattern or the like indicating a cutting position or a scale may be appropriately printed on the surface of the water absorbent sheet.

  An adhesive layer may be formed on one surface of the water absorbent sheet in order to attach the water absorbent sheet to a frame body that holds the window glass or a rail portion installed on the lower side of the frame. Moreover, it can replace with formation of an adhesion layer and can also affix with a double-sided tape.

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

  The window glass sash is composed of a window glass and a frame body that holds the window glass. First, the above-described dew condensation suppression sheet is attached to a window glass other than the frame body. And a water absorption sheet is attached to a frame. Moreover, you may attach a water absorbing sheet not only to a frame body but the rail part installed in the window glass sash lower side. The water absorbent sheet may be attached to the rail portion on either the bottom surface or the side surface of the concave portion of the rail portion.

  As described above, it is provided with the effect of suppressing condensation by attaching a dew condensation suppression sheet to the window glass, but in the present invention, 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 that holds the window glass is often made of a metal such as aluminum. When the frame body is made of metal, the frame body has higher thermal conductivity than the window glass. Therefore, the frame body is more easily affected by temperature change, and condensation is more likely to occur than in the window glass portion. On the other hand, when the water absorbing sheet is attached to the frame, the surface of the frame is less likely to cause condensation 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 condensation generated per unit area tends to be larger in the frame than in the glass. There is a tendency for the amount of condensation to occur. The reason for this is not clear, but probably the glass around the frame is more susceptible to temperature changes than the glass at the center due to the influence of the metal that makes up the frame, so that condensation is more likely to occur. It is guessed. In this case, by attaching a water absorbing sheet to the frame body with the kit of the present invention and covering it, it becomes difficult for condensation to occur on the frame body due to its heat insulation effect, and the temperature change is also suppressed in the glass around the frame body. Occurrence is suppressed. It is assumed that the dew condensation of the entire window glass sash can be more effectively suppressed by these synergistic actions.

  The features of the present invention will be described more specifically with reference to the following examples and comparative examples. However, the scope of the present invention is not limited to the examples.

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

(2) Production of water-absorbing sheet A nonwoven fabric (material: made of rayon) having a basis weight of 100 g / m ² was prepared, and this nonwoven fabric was laminated on one side of a polyethylene film having a thickness of 15 μm by lamination. After the pattern is printed on the other side of the non-woven fabric, it is coated with an overcoat to prevent discoloration (coating solution containing an antibacterial agent (“NOVALON VZF200” manufactured by Towa Gosei Co., Ltd., 7% by weight based on solvent)) And dried for 1 minute at 100 ° C. On the surface of the release paper for pressure-sensitive adhesive processing, a pressure-sensitive adhesive solution made of acrylic resin was applied with a coater so that the layer thickness after drying would be 24 to 45 μm. Thereafter, the release paper coated with the adhesive solution was dried to obtain a release paper with an adhesive layer having an adhesive layer formed on one side. A water-absorbing sheet was prepared by bonding the surface on the opposite side and the surface on the adhesive layer side of the release paper with the adhesive layer prepared above.

Comparative Example 1
A sheet of Comparative Example 1 was prepared using a PET film having a thickness of 38 μm without a water-repellent layer as a base film. Moreover, the water-absorbing sheet of the comparative example 1 was produced similarly to the water-absorbing sheet produced in Example 1 except having used the nonwoven fabric of a fabric weight of 180 g / m < ² > as a water-absorbing sheet.

Test example 1
About the Example and the comparative example, the test as shown below was performed, respectively. The results are shown in Table 1, respectively.

(1) Condensation test Condensation tests were conducted on the examples and comparative examples. As shown in FIG. 3 (a), the sliding-type window in an indoor room where the outside air temperature is 0 to 5 ° C., the room temperature is 20 ± 2 ° C., and the humidity is 65 ± 5% and maintained for 8 hours. The degree of dew condensation on the glass sashes 30a and 30b (consisting of two pieces in which a window glass having a height of 180 cm and a width of 90 cm was fitted into a frame body having a height of 190 cm and a width of 100 cm) was observed.
In this test example, as shown in FIG. 3B, the dew condensation suppression sheet 10 (height 180 cm, width 90 cm) and the water absorbing sheet 31 of Example 1 were prepared, and a window glass sash was prepared as shown in FIG. Affixed to the indoor side surface. Moreover, the water absorption sheet was affixed also to the rail part which is not shown in figure. The condensation suppression sheet 10 was attached to the window glass by attaching commercially available double-sided tape 32 (total of 6 locations per window glass) to the four corners of the condensation suppression sheet 10.
For comparison, in place of the dew condensation suppression sheet of Example 1 and using the same shape of Comparative Example 1 and the water absorbent sheet, the interior side of the window sash and the rail portion are the same as in Example 1. A sheet and a water absorbing sheet were attached.
In addition, the thing which affixed nothing to any location of a window glass sash and a rail part was made into the comparative example 2 (the following tests are also the same).
For these Examples and Comparative Examples, “◯” was obtained when no visible condensation occurred on the surface of the window glass, and “△” when visible condensation was produced but less than Comparative Example 2. ”, And“ X ”when condensation occurs.

(2) Wearability test The wearability of the condensed water absorption sheet to the window glass sash and the rail portion was examined. In said (1), the mounting | wearing property at the time of sticking a dew condensation water absorption sheet and a water absorption sheet was evaluated. It was evaluated as “◯” when it was able to be mounted without any problem such as lifting from the mounting surface, “△” when slight lifting occurred, and “X” when large lifting occurred.

(3) Opening / closing function test of window sash after mounting It was evaluated whether or not there was a hindrance to opening / closing the window glass sash after mounting the dew condensation suppression sheet and the water absorbing sheet. The evaluation was “◯” when the opening / closing could be performed without any problem, “△” when there was a slight catch but could be opened / closed, and “×” when the catch could not be opened / closed.

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

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

Claims (7)

A sheet for mounting on a surface where condensation can occur,
(1) The sheet includes a base film and a water repellent layer formed on part or all of the surface thereof,
(2) The water repellent layer includes 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 abuts on the surface where condensation can occur.
Condensation suppression sheet characterized by that. The dew condensation suppression sheet according to claim 1, wherein the hydrophobic fine particles form a porous layer having a three-dimensional network structure. The dew condensation suppression sheet according to claim 1, which has light transmittance. The dew condensation suppressing sheet according to claim 1, wherein a surface on which dew condensation can occur includes a surface on the indoor side of the window glass. A kit used for a window glass and a frame for holding the window glass,
(1) Condensation suppression sheet characterized by including the dew condensation suppression sheet according to claim 1 for mounting on the indoor side surface of the window glass and (2) a water absorbent sheet for mounting on the indoor side surface of the frame. For kit. A method for suppressing condensation on a surface where condensation can occur, comprising the step of attaching the condensation suppression sheet according to claim 1 to the surface. A product obtained by attaching the condensation suppression sheet according to claim 1 to a surface on which condensation can occur.