JP2003061815A - Heat reflex curtain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat reflex curtain capable of selectively reflecting the near infrared radiation of the sunbeam. SOLUTION: Synthetic resin emulsion containing an inorganic hollow body b including air inside is at least put on the one side of a curtain base material 11 so as to be 15-200 μm in dry thickness to reflect the near infrared radiation of the sunbeam selectively. The inorganic hollow body contains 60/40-30/70 weight ratio of the synthetic resin emulsion/the inorganic hollow body. The synthetic resin emulsion can be put on the part of the curtain base material 11 for the formation of a pattern.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-reflective curtain, for example, a curtain (including blinds) that is widely used in the openings of various buildings, and selectively reflects near-infrared rays of sunlight. Relates to a heat-reflective curtain.

[0002]

[Technical Background] In recent years, research has been conducted to enhance the heat insulating effect of the entire building from the viewpoint of suppressing carbon dioxide emission to the global environment and saving energy. In Japan, there is a tendency for a building to have a large opening, and in such a building, a large load is placed on temperature control equipment such as air conditioning and heating, and heat energy loss increases.

[0003] In particular, when the summer is high, sunlight directly penetrates the glass or the like in the opening and heats the room, so that the temperature rise in the room cannot be avoided. In order to prevent this, light is generally shielded by curtains or blinds.
However, with ordinary curtains and blinds, it is possible to prevent the sun from shining, but the temperature rise around the opening is unavoidable, and the air heated around this gradually convection to the inside of the room, A phenomenon may occur in which the room temperature does not drop even if the entire system is heated and the cooling is fully operated.

As described above, even if a curtain, a blind, or the like for blocking the sunlight of the sun is used, it is not possible to prevent the temperature rise in the vicinity of the opening and eventually raise the temperature of the entire room. Therefore, there is an urgent need to develop a technology that blocks near infrared rays that transmit heat of sunlight and reflects the infrared rays outside the building. As a technique for reflecting this sunlight, various techniques using a hollow balloon have been conventionally proposed (for example, JP 2001-64544A,
2000-290594, 2000-21247
5, 2000-73001, JP-A-11-315.
No. 146, No. 10-219209, No. 6-16488.
No., 5-272279, etc.).

[0005]

OBJECT OF THE INVENTION The present invention is a further development of the conventionally proposed technique using hollow balloons, and curtains, blinds and the like used in the openings of buildings (in the present invention, these are collectively referred to as "curtain"). It is an object of the present invention to provide a heat reflective curtain capable of selectively reflecting near infrared rays of sunlight on the outer surface of (referred to as). Further, in the present invention, a curtain using a so-called fabric made of fiber is a synthetic resin emulsion that does not use an organic solvent or the like that leads to environmental damage, and a coating film having such a selective reflection property of sunlight rays, Without impairing the original breathability of
It is also an object to provide such a curtain that can be formed.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the heat-reflective curtain of the present invention comprises a synthetic resin emulsion containing an inorganic hollow body in which air is enclosed, which is dried on at least one side of a curtain substrate. It is characterized by being applied so as to have a thickness of 15 to 200 μm, and selectively reflects near infrared rays of sunlight. The content of the inorganic hollow body is 60/4 in terms of the weight ratio of synthetic resin emulsion / inorganic hollow body.
It is preferably 0 to 30/70. The heat-reflective curtain of the present invention may be one in which a synthetic resin emulsion is partially applied to a curtain base material to form a pattern, and in this case, a so-called fabric made of fiber is used as the curtain base material. If so, the original breathability of the fabric is not impaired.

As the curtain base material in the present invention, various materials used for ordinary curtains, blinds and the like can be used, and examples include fiber cloth, synthetic resin sheets and films, and the like. The shape and dimensions are not particularly limited. Specifically, natural fibers, synthetic fibers, semi-synthetic fibers, woven fabrics made of fibers such as mixed fibers thereof, knitted fabrics (for example, laces), non-woven fabrics; vinyl chloride resins and other synthetic resins Examples thereof include a sheet-shaped or film-shaped one (for example, a roll curtain), and a plurality of strip-shaped ones connected in the longitudinal direction or the horizontal direction (ordinary blind or the like).

The thickness of the curtain base material is not particularly limited, and may be a thickness used as an ordinary curtain or blind. Generally, in the case of a synthetic resin sheet or film, the thickness is 0. It is about ² to ² mm, and in the case of a fabric made of fiber, it is about 200 to 1000 g / m ² . In particular, in the case of a fabric made of fiber, if it is thinner than this, the emulsion will be formed when the synthetic resin emulsion of the present invention (having a resin solid content described later and containing an inorganic hollow body) is applied. There is a case where it penetrates into the back side of the cloth and a good coating film cannot be formed. If it is thicker than this, although there is no such problem, the weight increases and practical use becomes difficult.

The synthetic resin emulsion to be applied to the above-mentioned curtain substrate preferably has a resin solid content of about 40 to 50% by weight, and the resin component is an acrylate ester type, urethane type, fluorine type, rubber latex type. Etc.

The synthetic resin emulsion of the present invention is
An inorganic hollow body containing air is contained inside, and the inorganic hollow body is one in which air is enclosed inside a capsule made of an inorganic material, specifically,
Examples thereof include glass balloons, shirasu balloons and fly ash. The capsules of these inorganic hollow bodies may be colored. The hollow body in which air is enclosed is not limited to the inorganic hollow body made of the above-mentioned inorganic material capsule, but there is also an organic hollow body made of a synthetic resin capsule, but the synthetic resin capsule is Since the near-infrared reflectance is smaller than that of the capsule made of an inorganic material, the present invention uses an inorganic hollow body in terms of reflection efficiency.

The particle size of the inorganic hollow body is not particularly limited, but the coating thickness of the synthetic resin emulsion on the curtain base material is about 15 to 200 μm in dry thickness, and therefore it is sufficient for a coating film of this thickness. It is sufficient that the adhesive strength can be maintained, and is generally about 150 μm or less, preferably 120 to
The thickness is about 10 μm, more preferably about 60 to 40 μm. When the curtain substrate is a fabric made of fiber, the inorganic hollow body penetrates inside the fiber, so even if the inorganic hollow body has a particle size larger than the thickness of the coating film, sufficient practical strength is obtained. Can be attached to the curtain substrate.

The content of the inorganic hollow body is 60/40 to 30/70 in a weight ratio of synthetic resin emulsion / inorganic hollow body.
Is preferred. The heat insulation performance of the air itself is 35 mW / mK, and the curtain of the present invention has such a high heat insulation performance that the inorganic hollow body enclosing air is adhered to one side of the curtain base material so that the sunlight Near infrared rays with high efficiency,
Specifically, it reflects 80% or more. If the content of the inorganic hollow body is less than the above value, a reflectance of 80% or more cannot be obtained, and even if the curtain according to the present invention is used for the opening of a building, the temperature rise in the room during the high summer can be prevented. It cannot be effectively prevented. The inorganic hollow body
If it is more than the above, not only the reflection efficiency of near infrared rays is saturated, but it is not economically disadvantageous, but the solid content in the synthetic resin emulsion becomes too large, making the coating operation on the curtain substrate difficult, and relatively In particular, the amount of the synthetic resin emulsion becomes small and the inorganic hollow body is not firmly fixed to the coating film, so that the inorganic hollow body may peel off during use of the curtain according to the present invention.

Various additives such as colorants, coupling agents, microcapsules and surfactants can be added to the synthetic resin emulsion containing the inorganic hollow body. Of the various additives described above, the colorant is generally a white reflection type one typified by titanium oxide, but is a light color type as long as the above reflectance can be obtained. Or a dark-colored heat-reflective pigment, for example, if the FASTONGN series (manufactured by Dainippon Ink & Co., Inc.) or the like is used as a pigment of a metal oxide, Since the reflectance can be easily obtained, it can be used.

The curtain of the present invention comprises the above-mentioned inorganic hollow body, and the synthetic resin emulsion of the above-mentioned resin solid content is applied to a curtain base material so as to have a dry thickness of 15 to 200 μm. If the thickness of this coating film is thinner than this, the reflectance of near infrared rays of sunlight cannot be 80% or more. Even if it is thicker than this, the reflection efficiency of near infrared rays is saturated and it is economically disadvantageous. Not only that, but the weight of the curtain is increased, the adhesion to the curtain base material is reduced, and the flexibility of the curtain base material, especially when the curtain base material is a textile material, This leads to problems such as loss of excellent flexibility.

The method for applying the synthetic resin emulsion to the curtain substrate is not particularly limited and may be any method, for example, a gravure coater, a roll coater,
There are various methods such as doctor knife coater, rotary screen, brush coating and dipping. If dipping is used, coating films are formed on both sides of the curtain substrate, but when forming only on one side, masking one side or forming two curtain substrate coating films. It suffices to bring them into contact with each other. The number of times of application is not limited to once and may be multiple times.

The above-mentioned synthetic resin emulsion may be partially applied to the curtain substrate, and in this case, the application may be performed by patterning into a pattern by a method such as a rotary screen or brush coating. preferable. In the case of applying this patterning, it is possible to form various patterns on the curtain of the present invention by applying a number of times using a synthetic resin emulsion to which the above-mentioned various colorants and infrared reflecting pigments are added. The curtain of the present invention can be
In addition to the near-infrared reflecting function of sunlight, it can also have an infrared reflecting function and an excellent design.

In addition, when the curtain base material is a textile material, since the synthetic resin emulsion containing the inorganic hollow body also enters between the fibers to form a coating film, so-called three-dimensional coating film formation is possible. It will be possible. In the curtain of the present invention in which such a three-dimensional coating film is formed, like a building in a city, there are buildings, advertising towers, telephone poles, various antennas and wirings, and other miscellaneous items. There are many structures, etc., and the sunlight is diffusely reflected at various angles from various directions.
It is possible to exhibit effective reflection characteristics when entering an opening of a building.

[0018]

Example 1 A synthetic resin emulsion A having the composition shown in Table 1 is formed on one side of a roll curtain made of a polyvinyl chloride sheet.
Was brushed to a dry thickness of 100 μm, dried in an oven at 50 ° C. for 15 minutes, and aged overnight to obtain a curtain of the present invention.

FIG. 1 is a schematic cross-sectional view for explaining the construction and operation of this curtain. In the figure, reference numeral 1 indicates a curtain, and this curtain 1 is provided on one entire surface of a polyvinyl chloride sheet 11. The synthetic resin emulsion A is applied. The synthetic resin emulsion A has a state in which the inorganic hollow body b in the emulsion A is fixed by using the synthetic resin r in the emulsion A as an adhesive. This curtain 1 is, as shown in the figure, sunlight S
Is incident on the surface of the inorganic hollow body b, and the near-infrared rays of the sunlight S can be highly efficiently reflected due to the excellent heat insulating performance of the air enclosed in the inorganic hollow body b.

The solar reflectance of the surface of this curtain coated with the synthetic resin emulsion was measured with a spectrophotometer. The results are also shown in Table 2. Further, sunlight was applied to the surface coated with the synthetic resin emulsion, the temperature change of this surface was measured, and the results are also shown in Table 2. In addition, the flexibility of the synthetic resin emulsion coating, when the curtain is spherically folded,
It is visually observed whether or not a crack is formed in the coating film. When the crack does not occur, it is marked with O, and when it does, it is marked with X.

Example 2 A synthetic resin emulsion B having the composition shown in Table 1 was formed on one surface of a roll curtain made of a sheet made of the same material as in Example 1.
Was coated with a roll coater to a dry thickness of 15 μm, and then dried and cured in the same manner as in Example 1 to obtain the curtain of the present invention. The solar reflectance of the curtain-coated surface of the synthetic resin emulsion was measured in the same manner as in Example 1. The results are also shown in Table 1. Further, sunlight was applied to the surface coated with the synthetic resin emulsion, the temperature change on this surface was measured, and the results are also shown in Table 1. Furthermore,
The flexibility of the synthetic resin emulsion coating film was measured and evaluated in the same manner as in Example 1, and the results are also shown in Table 1.

Example 3 A synthetic resin emulsion B having the composition shown in Table 1 was formed on one side of a roll curtain made of a sheet made of the same material as in Example 1.
Was coated with a doctor knife coater to a dry thickness of 200 μm, and then dried and cured in the same manner as in Example 1 to obtain the curtain of the present invention. The solar reflectance of the curtain-coated surface of the synthetic resin emulsion was measured in the same manner as in Example 1. The results are also shown in Table 1.
Further, sunlight was applied to the surface coated with the synthetic resin emulsion, the temperature change on this surface was measured, and the results are also shown in Table 1. Further, the flexibility of the synthetic resin emulsion coating film was measured and evaluated in the same manner as in Example 1, and the results are also shown in Table 1.

Example 4 A synthetic resin emulsion C having the composition shown in Table 1 was formed on one side of a roll curtain made of a sheet made of the same material as in Example 1.
Was coated with a comma doctor knife coater so that the dry thickness was 50 μm, and then the same drying and curing as in Example 1 was performed to obtain the curtain of the present invention. The solar reflectance of the curtain-coated surface of the synthetic resin emulsion was measured in the same manner as in Example 1. The results are also shown in Table 1. Further, sunlight was applied to the surface coated with the synthetic resin emulsion, the temperature change on this surface was measured, and the results are also shown in Table 1. Further, the flexibility of the synthetic resin emulsion coating film was measured and evaluated in the same manner as in Example 1, and the results are also shown in Table 1.

Comparative Example 1 A synthetic resin emulsion A having the composition shown in Table 1 was formed on one surface of a roll curtain made of a sheet made of the same material as in Example 1.
Was coated in the same manner as in Example 1 to a dry thickness of 250 μm, and then dried and cured in the same manner as in Example 1 to obtain a comparative curtain. The solar reflectance of the curtain-coated surface of the synthetic resin emulsion was measured in the same manner as in Example 1. The results are shown in Table 2. Further, sunlight was applied to the surface coated with the synthetic resin emulsion, the temperature change of this surface was measured, and the results are also shown in Table 2. Further, the flexibility of the synthetic resin emulsion coating film was measured and evaluated in the same manner as in Example 1, and the results are also shown in Table 2.

Comparative Example 2 A synthetic resin emulsion D having the composition shown in Table 1 was formed on one surface of a roll curtain made of a sheet made of the same material as in Example 1.
Was coated in the same manner as in Example 2 to a dry thickness of 50 μm, and then dried and cured in the same manner as in Example 1 to obtain a comparative curtain. The solar reflectance of the curtain-coated surface of the synthetic resin emulsion was measured in the same manner as in Example 1. The results are also shown in Table 2. Also,
Sunlight was applied to the synthetic resin emulsion-coated surface, and the temperature change on this surface was measured. The results are also shown in Table 2. Further, the flexibility of the synthetic resin emulsion coating film was measured and evaluated in the same manner as in Example 1, and the results are also shown in Table 2.

Comparative Example 3 A synthetic resin emulsion E having the composition shown in Table 1 was formed on one side of a roll curtain made of a sheet made of the same material as in Example 1.
Was coated in the same manner as in Example 1 to a dry thickness of 50 μm, and then dried and cured in the same manner as in Example 1 to obtain a comparative curtain. The solar reflectance of the curtain-coated surface of the synthetic resin emulsion was measured in the same manner as in Example 1. The results are also shown in Table 2. Also,
Sunlight was applied to the synthetic resin emulsion-coated surface, and the temperature change on this surface was measured. The results are also shown in Table 2. Further, the flexibility of the synthetic resin emulsion coating film was measured and evaluated in the same manner as in Example 1, and the results are also shown in Table 2.

[0027]

[Table 1] * 1: Product name “AC-100” manufactured by Asahipen Corporation * 2: Product name “Glass Bubbles” manufactured by Sumitomo 3M (average particle size 40 to 60 μm) * 3: Product name “Boncoat” manufactured by Dainippon Ink and Chemicals

[0028]

[Table 2]

Example 5 Woven fabric made of polyester fiber (Basis weight 300 g / m ² ).
The synthetic resin emulsion A having the composition shown in Table 1 was applied to one side of the roll curtain consisting of the above in a pattern with a rotary screen so as to have a dry thickness of 100 μm, and then the same drying and curing as in Example 1 was performed. To obtain a curtain of the present invention.

2A and 2B are views for explaining the curtain, in which FIG. 2A is a plan view and FIG. 2B is a partially enlarged sectional view. In FIG. Synonymous with 1,
The curtain 1 in this example is, as shown in FIG.
The synthetic resin emulsion A is applied in a grid pattern. As shown in FIG. 2 (B), the synthetic resin emulsion A applied in this lattice pattern has the inorganic hollow body b in the emulsion A on one side of the woven cloth 11 'and the synthetic resin emulsion in the emulsion A. The state in which r is fixed as an adhesive appears. This synthetic resin emulsion A is
As shown in FIG. 2 (B), not only the surface of one side of the woven fabric 11 ′ but also the inside of the weave penetrates to form the polyester fiber 11 ′.
Between c as well, the state in which the inorganic hollow body b is fixed with the synthetic resin r as described above appears.

The solar radiation reflectance of the surface of this curtain coated with the synthetic resin emulsion was measured in the same manner as in Example 1. The results are shown in Table 3. Further, sunlight was applied to the synthetic resin emulsion-coated surface, the temperature change of this surface was measured, and the results are also shown in Table 3. Further, the flexibility of the synthetic resin emulsion coating film was measured and evaluated in the same manner as in Example 1, and the results are also shown in Table 3.

Example 6 Woven fabric made of polyester fiber (Basis weight 300 g / m ² ).
The synthetic resin emulsion B having the composition shown in Table 1 was applied to one surface of the roll curtain consisting of the above in a pattern with a rotary screen so as to have a dry thickness of 15 μm, followed by the same drying and curing as in Example 1. Go, Figure 1
A curtain of the present invention having the same structure as shown in (A) and (B) was obtained.

The solar reflectance of the curtain coated surface of the synthetic resin emulsion was measured in the same manner as in Example 1. The results are also shown in Table 3. Further, sunlight was applied to the synthetic resin emulsion-coated surface, the temperature change of this surface was measured, and the results are also shown in Table 3. Further, the flexibility of the synthetic resin emulsion coating film was measured and evaluated in the same manner as in Example 1, and the results are also shown in Table 3.

[0034]

[Table 3]

[0035]

As described above, in the curtain of the present invention, the following effects can be obtained. (1) The inorganic hollow body in the coating film has excellent heat insulation performance, and this can selectively reflect near infrared rays of sunlight. (2) As a result, by using the curtain of the present invention in the opening of a building, especially in the midsummer, it is possible to effectively prevent the temperature rise in the room and significantly reduce the energy required for cooling the room. can do. (3) Further, by patterning the synthetic resin emulsion in a pattern and partially applying it, an excellent design can be imparted to the curtain of the present invention. (4) At this time, when a fabric made of fiber is used as the curtain base material, the breathability originally possessed by the fabric can be utilized. (5) In addition, when the curtain base material is a fabric made of fiber, the synthetic resin emulsion containing the inorganic hollow body also enters between the fibers to form a coating film, so that a three-dimensional coating film can be formed. In particular, it is possible to effectively reflect sunlight that is diffusely reflected by various structures existing around, such as an urban building.

[Brief description of drawings]

FIG. 1 is a schematic sectional view for explaining an embodiment of a heat-reflecting curtain of the present invention.

2A and 2B are views for explaining another embodiment of the heat-reflective curtain of the present invention, in which FIG. 2A is a plan view and FIG. 2B is a schematic sectional view.

[Explanation of symbols]

1 heat reflective curtain 11 Curtain substrate made of synthetic resin sheet 11 'Curtain base material made of textile material A coating film made of synthetic resin emulsion b Inorganic hollow body r Synthetic resin 11'c fiber

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) D06M 23/12 D06M 11/12 F term (reference) 2E182 AA01 AB03 AB05 AC01 BB01 CC04 FF02 4D075 CB04 DA04 DB20 DB38 DC03 DC38 EA13 EB10 EB16 EB22 EB35 EB38 EB56 EC01 EC24 EC54 4L031 CA08 DA00

Claims (3)

[Claims] 1. A synthetic resin emulsion containing an inorganic hollow body in which air is enclosed is applied to at least one surface of a curtain base material so as to have a dry thickness of 15 to 200 μm. A heat-reflective curtain characterized by selectively reflecting the near infrared rays of. 2. The content of the inorganic hollow body is 60/40 to 30/7 in terms of a weight ratio of synthetic resin emulsion / inorganic hollow body.
The heat reflective curtain of claim 1, wherein the heat reflective curtain is 0. 3. The heat reflective curtain according to claim 1, wherein the curtain base material is formed by partially applying a synthetic resin emulsion to form a pattern.