JP2005113948A - Plastic heat insulating material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plastic heat insulating material to be seasonally put on a window pane in use, having high heat insulating performance in a state in which it is water-stuck, namely, pushed against and put on a glass plate just coated with water and it is kept in this condition even when the water is dried. <P>SOLUTION: This plastic uneven film comprises valleys having a rectangular, particularly, square cross section of the same shape and size and mountains surrounding them and having substantially the same shape and size as the valleys, both of which are arranged in a checkerwise fashion. In view from the surface, the four ridges of each mountain are connected to the ridges of the adjacent mountains. In view from the reverse, four corners of each mountain are connected to the corners of adjacent mountains. A flat plastic back film and a liner film are pasted to each other with the bottoms of the valleys continued in series and the tops of the mountains continued in series to form air chambers with the mountains and the valleys sealed. The used plastic material is a polymer which is obtained by graft polymerizing polyolefine with acrylic acid and/or maleic anhydride or a kneaded material having hydrophillic groups such as mono or diglycerol fatty acid ester. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a flat surface requiring heat insulation, typically a glass plate, particularly a plastic heat insulating material used by being attached to a window glass, which can be attached to water on an object. . The heat insulating material of the present invention is particularly useful when applied to a glass plate such as a window glass only in winter or summer in order to increase the efficiency of heating and cooling.

Here, “water pasting” means that water can be applied to a flat plate such as a glass window, and the film can be pressed onto it to make it adhere, and then the appearance can be applied even when the water is dry. It means that the state is maintained. Although this film does not fall naturally, it is easily peeled off when a little force is applied.

A plastic film is vacuum-formed to form a cap film with a large number of cylindrical projections called “caps”, and a flat plastic back film is bonded to the bottom of the cap film to create a number of sealed air chambers. “Plastic bubble sheet” (hereinafter abbreviated as “bubble sheet”) is used mainly in the field of cushioning packaging, and a part thereof is used as a heat insulating material or a structural material. As a modified mode, there is also a three-layered bubble sheet in which another flat liner film is bonded to the top of the cap.

When a bubble sheet is used as a heat insulating material, depending on the mode of use, it has been experienced that the heat insulating performance sometimes falls below expectations. This is because the space around the cap is continuous and the air flow is not hindered even in the three-layer configuration as well as the two-layer configuration, and convection in the direction along the surface can easily occur. Possible cause.

The inventors of the present invention is a buffer heat insulating material by vacuum forming of a plastic film, and has a certain level of compressive strength depending on the thickness of the film, and thus can be used as a buffer material. Invented a plastic heat insulating material having a structure that completely prevents air convection in the surface direction and exhibiting higher performance than a conventional bubble sheet as a heat insulating material (Patent Document 1).

Prior to that, the inventors used a soft plastic film that can be folded and handled as a raw material. A plastic film that can be “water-sealed” and maintained in a state of being attached has been developed and also disclosed (Patent Document 2). In the case of a flexible plastic film, in many cases, simply applying water to the glass surface and pressing it onto the glass surface will temporarily stick it, but if the water runs out, it will usually peel off naturally.

Therefore, conventionally, to apply a plastic film to a window glass, an adhesive such as an acrylic emulsion was applied or a double-sided adhesive tape was used, but the adhesive remains on the glass surface even after peeling. The “rest” was inevitable. The traces are conspicuous in themselves and can be detrimental due to dust, which necessitates cleaning of the glass surface, which is a difficult task. The above technique has made it possible to apply water, and the remaining problems associated with the use of the pressure-sensitive adhesive have been solved.

As a plastic heat insulating sheet that can be attached to a window glass with water, there is a product already disclosed by the applicant (Patent Document 3). This heat insulating sheet has a structure composed of a cap film having a quadrangular pyramid shape and a liner film attached to the end of the cap film. This is because the cap formed by vacuum forming forms an independent air chamber with the glass plate when it is attached to the glass plate. Produce. Since the bottom surface of the cap film is flat and the portion in contact with the glass plate occupies a certain proportion of the projected area, it is suitable for water application. However, since air convection is possible as described above with respect to the bubble sheet, there is a limit to the heat insulation performance, and the idea of giving a hydrophilic group to the plastic material in consideration of the relationship with the glass plate is not adopted. There were limits to the reliability and sustainability of sticking.
JP2003-127215A JP2002-3655 JP-A-10-156984

The inventors attempted to utilize the above-described technology for ensuring water adhesion by introducing a hydrophilic group into a plastic film as described above, to a plastic insulation material having excellent heat insulation performance. As a result, it has been found that this water sticking technique can be suitably used in a plastic heat insulating material having a specific structure. Furthermore, the inventors have confirmed that this water-adherable plastic heat insulating material can be applied to a coated metal plate like a metal door.

Accordingly, an object of the present invention is a plastic heat insulating material having a structure that completely prevents air convection in a plane direction, and exhibiting higher performance as a heat insulating material than a conventional air bubble sheet. The object is to provide an object that can be applied with water to an object such as a plate.

The plastic heat insulating material of the present invention that achieves the above object has a basic aspect and a modified aspect. The basic embodiment is outlined in FIGS. 1 and 2, and as shown in detail in FIG. 3, a rectangular cross-section trough (2) produced by vacuum forming of plastic film and having the same shape and dimensions; Mountains (3) having substantially the same shape and dimensions as the valleys surrounding them are arranged in a checkered pattern, and when viewed from the table, the four ridges (31, 32, 33, 34) of each mountain are adjacent to the mountains. Convex and concave film (1) that is connected to the ridges and has four corners (21, 22, 23, 24) of each valley connected to the corners of the adjacent valleys when viewed from the back By attaching the flat plastic back film (4) to the bottom of the valley (25) and attaching the flat plastic liner film (5) to the top of the mountains (35), Sealed sky in mountains and valleys It is a heat insulating material (1A) having a three-layer structure as a chamber, and as a material for a back film or a liner film, a polyolefin resin kneaded with a substance having a hydrophilic group compatible with the polyolefin resin is used. Thus, it is a plastic heat insulating material that enables water to be applied to an object.

As shown in FIG. 4, the modified embodiment of the plastic heat insulating material of the present invention is manufactured by vacuum forming a plastic film, and has a rectangular cross section valley (2) having the same shape and dimensions, The surrounding mountains (3) having substantially the same shape and dimensions as the valleys are arranged in a checkered pattern, and when viewed from the table, the four ridges (31, 32, 33, 34) of each mountain are the ridges of the adjacent mountains. Even when viewed from the back, the four corners (21, 22, 23, 24) of each valley are connected to the corners of the adjacent valleys of the uneven film (1), A two-layer material (1B) with a flat plastic back film (4) bonded to the bottom of the valley (25) and a sealed air chamber in the mountains, and the top of the mountains (35) A flat plastic liner film (5) A heat insulating material having a four-layer structure in which a material (1C) having a two-layer structure in which a valley is hermetically sealed by combining the layers and facing each other is overlapped, and a back film or a liner film This material is a plastic heat insulating material that is made of a polyolefin resin that is compatible with this and kneaded with a substance having a hydrophilic group so that it can be attached to water on an object.

Since the basic aspect of the heat insulating material according to the present invention has the above-described three-layer structure, the air chamber is entirely sealed, and the air flow along the surface is blocked. Heat transfer by convection is limited to that caused by convection that occurs within one of the peaks or valleys and has high thermal insulation performance. In the modified mode, the volume of the air chamber is small due to the structure of the four-layer structure, air convection is less likely to occur inside, and the number of plastic film layers is increased. More than that.

In either case, the reliability and durability of water sticking is high by kneading a material having a hydrophilic group in a film on the side in contact with the object such as a glass plate, that is, a back film or a liner film. Since the material is polyolefin, and the walls that form the peaks and valleys are almost perpendicular to the surface of the heat insulating material, relatively high transparency can be secured, and the window glass is the main application. On the other hand, when this heat-insulating material is applied, the annoyance that makes it difficult to see the outside is hardly a problem.

Regardless of the aspect, in the heat insulating material of the present invention, the cross-sectional shape of the valley and the mountain may be the same rectangle, but the physical property is desired to have anisotropy in the vertical and horizontal directions. Apart from that, a square is usually preferred. Each example shown in each figure has a square cross section.

In order to produce the plastic heat insulating material of the present invention, first, the above-described plastic uneven film (1), that is, a valley and a mountain surrounding the valley and having substantially the same shape and dimensions as the valley, are in a checkered pattern. When viewed from the front, the four ridges of each mountain are interconnected with the ridges of the adjacent mountains, and when viewed from the back, the four corners of each valley are interconnected with the corners of the adjacent valleys. Next, the flat plastic back film (4) is bonded to the bottom of the valleys, and the flat plastic liner film (5) is connected to the tops of the mountains. Or an operation of combining only the back film and only the liner film.

The method for producing the plastic uneven film (1) is disclosed in detail in the above-mentioned Japanese Patent Application Laid-Open No. 2003-127215, but will be briefly described. One method is batch-type, using a material for plastic vacuum molds to form valleys and cavities with a rectangular cross-section and a certain depth to form peaks. Projections having substantially the same shape and dimensions as the valleys are arranged in a checkered pattern, and the four ridges of each projection are isolated with a slight gap between each other, and a vacuum suction hole is formed at the bottom of the gap. And forming a thermoplastic film in a thermoplastic state by vacuum forming.

The manufacturing method using the above vacuum forming mold can only be a product according to the size of the mold or a product in which it is connected, and it is necessary to manufacture a long product often required for a plastic heat insulating material. Not suitable. In order to manufacture a long product, the mold cavity and the roll-shaped mold placed on a rotatable cylinder are used, and vacuum molding is performed on a continuously supplied plastic film. Then, an operation of continuously laminating a flat film on one or both sides of the obtained long molded product is required. The plastic concavo-convex film (1) can also be continuously produced by using a device in which a pair of cavities and projections arranged on a cylinder are arranged so that the cavities and projections of the rolls are engaged with each other.

The compound having a hydrophilic group to be contained in a plastic film in contact with an object such as a glass plate is described in the above-mentioned JP-A No. 2002-3655. It refers to a group such as OH, = O, -O-. A typical example of such a compound that can be easily used in combination with a polyolefin is an acrylic compound. Specifically, acrylic acid and methacrylic acid and their lower aliphatic alcohol esters. Maleic anhydride and its esters are also useful. Among the trials used so far, a polymer obtained by graft polymerization of acrylic acid and maleic anhydride to polyolefin has been most suitable. Surfactants such as mono- or diglycerin fatty acid esters are also useful as materials having hydrophilic groups. It is also effective to use a polymer in which the above hydrophilic group is incorporated in the molecule and a surfactant.

The ratio of mixing the polyolefin and the substance having a hydrophilic group is influenced by factors such as the compatibility of the two, the density of the hydrophilic group in the latter, or the thickness of the film, but is generally possible in a wide range.

In addition to the above, the plastic heat insulating material of the present invention can have various modes. For example, an appropriate colorant such as a pigment, for example, a pigment, for example, 0.75 to 1.5 PHR is mixed with polyethylene at the time of production to give an arbitrary color, and a heat insulating material is applied to a window glass. In this case, the light transmitted through the window glass can have a desired color and brightness.

In particular, in the case of a plastic insulation material in a modified mode, it consists of a combination of the two types of materials described above, so that the material that is not affixed can be removed during or after application to the object, It is possible to replace it with a new one. That is, first, the heat insulation performance can be adjusted higher or lower as necessary. Second, the colors can be different from place to place. When the object is a window glass, even if the material pasted on the glass plate side is constant, the transmitted light is reduced by subdividing the inner material to be combined into several parts and making each color different. It can be different depending on the location. In this case, it goes without saying that variations in which colorless and transparent ones are used or combinations are not performed depending on the portions are possible. In this way, the modified embodiment of the present invention can easily realize an excellent heat insulating material in terms of design and cosmetics.

The film constituting the plastic heat insulating material of the present invention is generally easier to apply water to the heat insulating material when it is thinner, but it needs to have a certain thickness for the convenience of manufacturing and handling. The thicker one can be carried out within the range that does not lose the flexibility that can be applied with water. The appropriate thickness range will vary depending on the flexibility of the polyolefin material used and the design of the insulation, i.e. whether it is a three- or four-layer configuration, or the choice of valley and peak dimensions, The film (1), the back film (4) and the liner film (5) are commonly used in a thickness of 5 to 150 μm, preferably 10 to 100 μm. The dimensions of the valley (2) and peak (3) can also be varied, but in the case of a square cross section that is preferred, one side of the cross section is 5-30 mm, preferably 10-20 mm, the depth of the valley The height or the height of the mountain may be selected from the range of 1 to 12 mm, preferably 2 to 5 mm.

The pellets of modified polyethylene having hydrophilic groups obtained by graft polymerization of acrylic acid on polyethylene were compared with pellets of low density polyethylene (density: 0.93, MI: 3 g / 10 min) at a weight ratio of 70:30. A blend was prepared. This hydrophilic material-kneaded polyethylene is used as a back film, and the other films are only made of the above-mentioned low-density polyethylene, and the above-described apparatus having a pair of rolls in which the cavities and the projections are engaged with each other. An uneven film of a plastic film having valleys and peaks was formed, and a back film and a liner film were sequentially bonded together by thermal fusion to produce a three-layer heat insulating material.

The obtained heat insulating material has the following dimensions:
Valley (or mountain) shape: Square valley (or mountain) with a side of 12 mm Depth (or height): 3.5 mm
Uneven film thickness: 16 μm
Back film thickness: 14μm
Liner film thickness: 15 μm
It was easy to attach water to the window glass, and the state was maintained for a long time while being adhered even after drying.

Since the plastic heat insulating material of the present invention has high heat insulating performance, it is easy to attach water to an object such as a glass plate, and it has an advantage that it lasts for a long time. It can be widely applied to objects that require heat insulation of various buildings, such as public facilities and warehouses, in particular, a scene where it is desired to efficiently perform heating or cooling for a certain period of time. Thermal insulation is desirable, such as metal doors, and is also useful for objects that want to prevent condensation. In the season when insulation is not necessary, the plastic insulation can be easily peeled off, wound up and stored, so that it can be used repeatedly in the next season when insulation is required.

The top view which showed the structure by notching a part about the basic aspect of the plastic heat insulating material for glass plates by this invention. II sectional view of the plastic heat insulating material of FIG. The enlarged view which shows in detail the internal structure of the plastic heat insulating material of FIG. Sectional drawing similar to FIG. 2 which shows the manufacturing process about the change aspect of the plastic heat insulating material of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Uneven film 1A Plastic heat insulating material 1B for glass plates according to the basic aspect of the present invention Material (1 + 4) constituting the plastic heat insulating material of the modified aspect of the present invention
1C Material (1 + 5) constituting the plastic heat insulating material according to the modified embodiment of the present invention
2 Valleys 21, 22, 23, 24 Four corners of the valley 25 Bottom of the valley 3 Mountains 31, 32, 33, 34 Four mountain ridges 35 Mountain peaks 4 Back film 5 Liner film

Claims (10)

The rectangular cross-section valleys that are manufactured by vacuum forming of plastic film and have the same shape and dimensions, and the mountains that surround them and have substantially the same shape and dimensions as the valleys are arranged in a checkered pattern. The four ridges of each mountain are mutually connected with the ridges of the adjacent mountains, and when viewed from the back, the uneven film of the shape in which the four corners of each valley are mutually connected with the corners of the adjacent valleys, Three layers with a flat plastic back film that connects the bottom of the valleys and a flat plastic liner film that connects the tops of the mountains and a flat plastic liner film. A heat insulating material having a structure, in which a material having a hydrophilic group, which is compatible with polyolefin resin, is kneaded as a back film or liner film material By using a plastic insulation material which enables bonding of water to the object. The rectangular cross-section valleys that are manufactured by vacuum forming of plastic film and have the same shape and dimensions, and the mountains that surround them and have substantially the same shape and dimensions as the valleys are arranged in a checkered pattern. The four ridges of each mountain are mutually connected with the ridges of the adjacent mountains, and when viewed from the back, the uneven film of the shape in which the four corners of each valley are mutually connected with the corners of the adjacent valleys, By laminating a flat plastic back film that connects the bottom of the valleys and attaching a flat plastic liner film that connects the tops of the mountains and a flat plastic liner film. It is a heat insulating material having a four-layer structure in which two-layer structure materials having air spaces sealed in the valleys are stacked with the respective irregularities facing each other, and is a material for a back film or a liner film To, a polyolefin resin, which with a compatible, by using a material obtained by kneading a substance having a hydrophilic group, a plastic insulation material which enables bonding of water to the object. The plastic heat insulating material according to claim 1 or 2, wherein the valley and mountain have a square cross section. 4. The plastic heat insulating material according to claim 1, wherein the substance having a hydrophilic group is a polymer obtained by graft-polymerizing acrylic acid and / or maleic anhydride to polyolefin. The plastic heat insulating material according to any one of claims 1 to 3, wherein the substance having a hydrophilic group is mono- or diglycerin fatty acid ester. The plastic heat insulating material according to any one of claims 1 to 5, wherein the object to be affixed with water is a glass plate. The plastic heat insulating material according to claim 6, wherein the glass plate is a window glass. The plastic heat insulating material according to claim 6, wherein an ultraviolet absorber is added. The plastic heat insulating material of Claim 6 which adjusted the transparency by providing the fine unevenness | corrugation in the side which does not contact a window glass. The plastic heat insulating material according to any one of claims 1 to 5, wherein the object to be affixed with water is a metal door.

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