JPS62242528A - Heat-shielding sheet - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sheet with excellent heat shielding properties.

[Conventional technology]

Conventionally, flexible laminated sheets have been used as sheet materials for awning tents, eaves tents, or air membrane structures. These sheet materials are intended to prevent LH exposure as well as to block )1 light. In order to actively reflect sunlight on the surface of a sheet material, attempts have been made to coat the surface of the sheet material with a film of a plastic material in which a light-reflecting substance, such as aluminum powder, is dispersed. This method allows sunlight and heat rays to be reflected on the surface of the sheet material, thereby preventing a rise in temperature of the back side of the sheet material and the space covered by the sheet material. However, the temperature of the surface light-reflecting layer of the sheet material itself gradually rises, and this heat is gradually transferred through the sheet material, and eventually to the internal space covered by the sheet material.

In addition, in the above-mentioned sheet material, since the outermost layer must be formed of a light-reflecting layer, on top of that,
It was not allowed to apply the desired color and/or pattern. Therefore, the use of sheet materials having the above-mentioned restrictions is also limited.

[Problem that the invention seeks to solve]

The problem to be solved by the present invention is to prevent the temperature of the sheet itself from rising in a heat-insulating sheet, and to form a color and/or pattern on the surface as desired. .

[Means and actions for solving problems]

The heat shielding sheet of the present invention has the following component layers, namely (A
) a matrix consisting of a film-forming polymeric material, uniformly dispersed in this matrix and having a content of 10 to 200%, based on the weight of said matrix, and 50 W m
and (B
) a matrix laminated on the back surface of the basic layer and made of a film-forming polymer material; and a back heat insulating layer comprising a heat insulating material.

When a tent made of sheet material or an air membrane structure is irradiated with H light, the temperature of the sheet material itself and the interior space covered by it rises because of the infrared rays and heat rays in the irradiated light. This is because infrared rays and heat rays that are modified from visible light are accumulated inside the sheet material, conduct heat through the sheet material, and are radiated from the back surface of the sheet material to the inner space covered by the sheet material. In order to prevent such temperature rise, the sheet material of the present invention has an infrared reflective layer. This infrared reflective layer reflects infrared rays originating from irradiated sunlight, thereby preventing the sheet material itself from increasing in temperature. This infrared reflective layer may be formed on the surface of the sheet material, but it is not necessarily necessary and may be formed under a colored and/or patterned surface layer. The infrared reflective layer is
Contains an infrared reflective material uniformly dispersed in a film-forming polymeric material. This infrared reflective material is not particularly limited as long as it has infrared reflective properties, but it is preferably one that itself has low thermal conductivity.

For example, the following substances: Mn
5.79 p b 39.6 7'i 31.2 Sift 20-40 T 1Otl 6.9-23.5 etc. have low thermal conductivity and are therefore preferred infrared reflective materials for the present invention. Also, these compounds, such as yellow lead,
etc. are also preferable.

However, the following substances: Substance name Thermal conductivity (W m -' K -')
Al 302 Fe 132 Cu 1220 /11,0. 77 to 150 and the like have relatively high thermal conductivity, and therefore are not preferred as the infrared reflective material of the present invention.

Generally, the thermal conductivity of the infrared reflective material used in the present invention is 50 Wm-1K-' or less. Such an infrared reflective material having a low thermal gradient is effective in preventing a rise in temperature of the sheet material itself.

The infrared reflective layer of the present invention preferably has an infrared reflectance of 70% or more, more preferably 80% or more. Film-forming polymeric materials forming the matrix of the infrared reflective layer are, for example, polyvinyl chloride, polyester, polyamide.

Fluorine-containing polymer resins, silicone resins, synthetic rubbers (e.g., polybutadiene, butadiene-ethylene copolymers,
Polychloroprene, polyisoprene.

Polyisobutylene, acrylic rubber, fluororubber (trifluorochloroethylene-vinylidene fluoride copolymer, etc.)
), chlorosulfonated polyethylene, and natural rubber.

The crab is an infrared reflective substance dispersed in the matrix.
It can be appropriately set to exhibit an infrared reflectance of 70% or more as described above, but generally it is 10 to 200% with respect to the film-forming polymer material forming the matrix.
, preferably in the range of 15 to 150%. The particle size of the infrared reflective material is not particularly limited as long as the object of the present invention can be achieved, but it is generally preferably 50 mesh size or finer, and 100 to 300 mesh size. It is more preferable that there be.

There is no particular limitation on the thickness of the infrared reflective layer, but it is generally used in the range of 0.05 to 1.0 mm.

In the heat-shielding sheet of the present invention, the base layer may be composed of the above-mentioned infrared reflective layer alone, or may be a laminate with other layers.

A surface layer having a desired color and/or pattern may be laminated on the infrared reflective layer. This surface layer consists of a matrix of film-forming polymeric material and a pigment dispersed in the matrix or a colorant applied onto the surface. Examples of polymer materials for the matrix include polyvinyl chloride, chlorosulfonated polyethylene, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polyethylene-ethylene/vinyl acetate copolymer-polyvinyl chloride graft polymer, and ethylene-propylene. Diene polymers, polyacrylics and other thermoplastic polymers.

One or more types of rubbers are used.

There is no particular limitation on the thickness of the surface layer, but it is between 0.05 and 0.05.
The thickness is preferably about 5 mm.

A back heat insulating layer is formed on the back surface of the light shielding sheet of the present invention. This back insulation layer also has a matrix of the same film-forming polymeric material as the surface layer described above, is uniformly dispersed in this matrix, and has a power density of 10 W m -I.
It has a thermal conductivity of K-1 or less, preferably -1 to 5 Wm- or less, and -C contains a particulate heat-insulating material that does not have infrared reflectivity. For example, the following materials can be used as the particulate heat insulating material.

U,! 1-1
・ (Wm-Kudzu K-1) Glass grains
1.1 Polymer material grains 0.1-0.4 mica grains
0.54 Asbestos 0.14 Wood particles 0.1-0.6 Fiber waste particles
0.01 to 0.3 It is preferable to use hollow glass beads behind these heat insulating materials. In particular, the average particle density (true density, according to STH02840, using an air comparison pycnometer) 0.10 = 0.
70 g/m1, bulk density, 0.10-0.50 g1
Hollow glass beads of about m1 are suitable for the present invention. Among such hollow glass beads, those having a particle size of 50 to 300 mesh are preferable, and those having a particle size of 80 to 200 mesh (177 to 74 mesh Im) are more preferable. Beads are generally 2
．． 48-9.92 kcal-cs/hr-m
” ・It has a thermal conductivity of about ℃.

This back heat insulating layer forms the back surface of the light shielding sheet of the present invention, and is effective in preventing the temperature of the sheet material itself from rising without radiating the heat accumulated in the sheet material itself to the outside. It is.

The insulation material is 0.3 to 80 m based on the matrix weight.
: It is preferable to use the content at a content of %.

There is no particular limitation on the thickness of the back insulation layer, but it is 0.05~
It may be about 0.5 mm, and it may be independent,
Alternatively, it may contain open cells.

The base layer of the heat-insulating sheet of the present invention may include one or more fiber fabric layers as a reinforcing layer. This reinforcing fiber fabric layer is preferably provided on the back side of the infrared reflective layer, and also has an infrared reflective layer. Preferably, it is inserted between the layer and the heat insulating layer.

Whether the reinforcing fiber fabric layer is woven or knitted,
Alternatively, it may be a nonwoven fabric, but a woven fabric is generally preferred. This reinforcing fiber fabric layer is made of natural fibers such as cotton, hemp and animal hair, regenerated fibers such as rayon and cupro, semi-synthetic fibers such as cellulose acetate fibers, synthetic fibers such as polyester fibers, water-insolubilized polyvinyl alcohol, etc. Fibers, nylon 66 fibers and nylon fibers, aromatic polyamide fibers and mineral fibers, inorganic fibers such as glass fibers, carbon fibers may be constituted. Further, the fibers constituting the fabric may be in the form of short fibers, long fibers, tape fibers, or splint yarns.

In one embodiment of the heat-shielding sheet of the present invention shown in FIG. A back heat insulating layer is laminated on the lower surface of the reflective layer 1.

Further, in one embodiment of the heat-insulating sheet of the present invention shown in FIG. 2, a surface layer 2 and a reinforcing fiber fabric layer 4 are laminated on the upper and lower surfaces of the infrared reflective layer l, respectively, and the base layer 1b
is formed, and a back heat insulating layer 3 is laminated on the lower surface of the reinforcing fiber fabric layer 4.

In the heat-insulating sheet of the present invention shown in FIGS. 1 and 2 above, one or more of the surface layer and the reinforcing fiber fabric layer may be omitted.

In the heat-shielding sheet of the present invention, the infrared reflective layer may be a sheet or film made of a mixture of the above-mentioned polymer material and an infrared reflective substance, and this film or sheet may be made of, for example, a reinforcing fiber. It may be attached to one side of the fabric layer by calendering or the like. Alternatively, a paint containing the mixture may be applied to at least one surface of the reinforcing fiber fabric layer by coating, topping, etc., or may be impregnated entirely by dipping, etc.

The surface layer and the back heat insulating layer are each formed by the same film adhesion method or coating method as described above.

〔Example〕

The heat-insulating sheet of the present invention will be explained in more detail with reference to Examples.

Example Ten types of sheets with the configurations shown in Table 1 were created.

(1) Reinforcing fiber fabric layer 1 is a fabric woven into the following structure using polyethylene terephthalate long fiber yarn of 1000 denier/200 filament, which is formed from the following fabric.

1000/ I
m, and was scoured and dried by a conventional method.

(2) The infrared reflective layer, the surface layer, and the back heat insulating layer were formed by applying a film (thickness: 0.1 mm) having the following composition under pressure at 175° C. using a calender roll.

PVC100100100 DOP 80 80 80 Red pigment Small amount -- Hollow glass piece (umbrella) - 20 Note (*1) - The infrared reflectance of the above infrared reflective layer film in 100 (1-rrLP) was 90%.

(*2)-Product name Glass Bubbles B 60/1000
0, specific gravity 0.6, central grain size 50/Jm, thermal conductivity 8 approx. 1
．． l Wm-'K-' Using each of the 10 types of sheets obtained, a semi-cylindrical airtight tent large enough to accommodate a small passenger car was made, and on a clear day in summer, the tent was sealed in the morning and the afternoon airtight. At 1:30, when the outside temperature reached 32° C., the temperature on the 4 side of each tent and the air temperature inside the tent were measured. The results are shown in Table 1.

Margin below [Effects of the Invention] As clearly shown in Table 1 above, the sheet of the present invention has excellent heat shielding properties.

In particular, a comparison between sheet No. 1 (comparative example) and sheet No. 14 (invention), sheet No. 2 (comparative example) and sheet N
Comparison with o, 5 (present invention) and sheet No.? (
As is clear from the comparison between Sheet No. 8 (Comparative Example) and Sheet No. 8 (Invention), in the invention, the heat insulation properties of the sheet can be further improved by combining the infrared reflective layer with the back heat insulation layer.

[Brief explanation of drawings]

FIGS. 1 and 2 are explanatory cross-sectional views showing the structure of 81st aspect of the heat-insulating sheet of the present invention, respectively. ■...Infrared reflective layer, la, lb...basic layer, 2
...Surface layer, 3...Back insulation layer, 4...
- Reinforced fiber fabric layer. 1...Infrared reflective layer la, lb...Basic layer 3...Back insulation layer 460. Reinforced fiber fabric layer

Claims (1)

[Claims] 1. The following component layers: (A) a matrix made of a film-forming polymer material;
uniformly dispersed in this matrix, with a content of 10 to 200% based on the weight of the matrix, and a content of 50 Wm
a base layer comprising an infrared reflective layer comprising a particulate infrared reflective material having a thermal conductivity of ^-^1K^-^1 or less, and (B) laminated on the back surface of the base layer, and a matrix made of a film-forming polymeric material, uniformly dispersed in the matrix, and having a power of 10 Wm^-^1K^-^
A heat-insulating sheet comprising: a back heat-insulating layer comprising a heat-insulating material having a thermal conductivity of 1 or less; 2. Claim 1, wherein the base layer is laminated on the surface of the infrared reflective layer, has a desired color and/or pattern, and has a surface layer made of a film-forming polymer material. Heat shielding sheet as described in section. 3. The heat shielding sheet according to claim 1, wherein the infrared reflective layer has an infrared reflectance of 70% or more. 4. The infrared reflective material is TiO_2, Mn, Pb
, Ti, SiO_2, and yellow lead. 5. The heat-insulating sheet according to claim 1, wherein the heat-insulating material is a hollow glass bead. 6. The heat shielding sheet according to claim 1, wherein the base layer has at least one reinforcing fiber fabric layer laminated on the back side of the infrared reflective layer.