JPH06293099A - Heat insulating pad material and production thereof - Google Patents

Abstract

PURPOSE:To obtain a heat insulating pad material such as a battery shield having beautiful appearance, preventing discharge in the winter season and preventing a temp. rise in the summer season to avoid the evaporation of a liquid and facilitating the detachment and attachment of a pad at a time of the replacement of a discharge battery. CONSTITUTION:A high m.p. resin film 2 is superposed on the rough surface of an in-mold foam molded object 1 cut from an in-mold foamed molded single object or block member due to a beads method through a low m.p. resin film 3 and the resin film 3 is melted by heating to patternwise laminate the high m.p. resin film 2 on the rough surface of the foamed molded object 1 in a seedy- through manner to form a heat insulating pad.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a heat insulating pad material having a beautiful appearance by using an in-mold foam molded article by a bead method and the heat insulating pad material, and particularly discharge prevention in winter and summer. The present invention relates to a method for producing the heat insulating pad material and a heat insulating pad material suitable for being used by coating the outer surface of a battery or the like which is required to suppress temperature rise.

[0002]

2. Description of the Related Art As a heat insulating pad material, various materials such as a foamed material such as urethane foam are widely used in correspondence with various places where heat insulation is required. However,
Although it is necessary to prevent discharge at low temperatures in winter like batteries, and to prevent temperature rise to avoid evaporation of liquid at high temperatures in midsummer, as a heat insulating pad material, in a wide temperature range from low temperatures in winter to high temperatures in midsummer. Insulation and heat retention are required, prevention of embrittlement at low temperatures, heat insulation and confidentiality, fitability to eliminate gaps in the battery, easy and quick setting at the battery factory, easy removal and replacement when reloading the discharge battery Properties, oil and chemical resistance, heat resistance, recyclability, wall thickness (8-10 mm), economic efficiency,
There are many quality characteristics that are extremely required, such as high-class feeling. However, the above-mentioned conventionally used heat insulating pad material cannot satisfy such quality characteristics, and only a few of them are satisfied.

Therefore, recently, a heat-insulating cover having a flattened periphery filled with a polyester sponge or glass fiber inside the epidermis has been prepared and is used by covering the periphery of the battery.

[0004]

However, it can be said that the heat insulating cover of the battery currently used is suitable for the purpose of heat insulating and heat insulating, but it has a lot of man-hours and requires a lot of time and effort to make it, which results in a high cost. I cannot escape. Moreover, since it is made of a composite material, it has a problem in recyclability, and also has a drawback in that it cannot be attached to and detached from a battery, and it lacks fit characteristics.

The present invention addresses the above-mentioned situation, provides a heat insulating pad material which is easy to manufacture, particularly easy to form by a single material, and which particularly satisfies each quality characteristic required for the battery shield (heat retaining pad). By doing so, the appearance is beautiful and discharge can be prevented in winter, temperature rise can be prevented in summer to avoid liquid evaporation, and the purpose is to remove the pad when transferring the discharge battery and to facilitate installation. To do.

[0006]

In order to achieve the above-mentioned object, the present invention uses an in-mold foam molded article by the bead method, and in particular, has a high melting point resin through a low melting point resin film on the surface having a rough surface. The heat-insulating pad material was formed by stacking the films and melting the low melting point resin film by heating and laminating it on the surface of the foamed molded product.

Further, in order to improve the production efficiency of the above-mentioned heat insulating pad material, the present invention molds into a block body having a required expansion area and thickness by in-mold foam molding by the bead method, and the block body is formed into a plurality of blocks having an appropriate thickness. After slice-cutting into a plate shape, the high melting point resin film is overlaid on the cut fine rough surface via the low melting point resin film, and the low melting point resin film is melted by heating to cut the high melting point resin film. The heat-insulating pad material was prepared by laminating the finely roughened surface on the cut surface so that it can be seen through in a pattern like a satin pattern.

Further, the foamed resin cell cross section of the rough surface is positively made into a concavo-convex pattern by the heating temperature, heating time and pressing force of the heating means for laminating the rough surface of the cut foamed molded article with the film. An uneven pattern was formed on the surface when laminating with.

For the heat insulating pad, it is preferable that the foam molding material and the low melting point and high melting point film materials are the same or similar. For example, the polypropylene low melting point and high melting point resin film is added to the foam molding. The one used is most suitable.

[0010]

According to the above-mentioned method of the present invention, the heat insulating pad material is formed only by molding the in-mold foamed molded product and polymerizing the resin film having the low melting point and the high melting point. Since the rough surface on the surface of the foamed molded product is seen through the high melting point resin film in a pattern form, a very beautiful pear-like pattern is revealed.

Further, by cutting the block body into slices to form a heat insulating pad material having a required thickness, the production efficiency is improved, and the number of formations is greatly increased. Furthermore, it becomes easy to form the foamed molded product and the low-melting point and high-melting point resin films from a single material, and the recyclability is improved.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is an embodiment showing the basic method of the present invention. In the figure, 1 is a foamed molded article formed by in-mold foaming by the bead method, and 2 is a surface of which a low melting point resin film 3 is interposed. It is a high melting point resin film polymerized by.

The foamed molded article 1 is formed by molding foamable resin particles (foamed beads) as a raw material for molding, filling the male and female dies with heat fusion, cooling and molding into a product. In-mold foam molding is possible at any time.For example, the folding part can be formed into a horizontally long and short shape as a thin part so as to surround the four circumferences of the battery, and it is easy to provide an opening window on the protruding part such as a terminal if necessary. Is. The resin forming this foamed molded article may be any resin which can be foamed in-mold, and examples thereof include polyethylene, polypropylene, polystyrene, acrylonitrile-styrene copolymer, methacrylic acid ester-styrene copolymer, and polystyrene. Although various resins such as polyethylene copolymers can be mentioned, polyethylene resins and polypropylene resins are common, and polypropylene foam moldings are most practical. The foamed molded product by this in-mold foam molding is usually
A hexagonal pattern is formed on the surface by fusion of expanded beads, and it has a rough fine surface.

On the other hand, the low melting point resin film 3 and the high melting point resin film 2 laminated on the rough surface of the foamed molded article 1 are thermoplastic resin films such as polyethylene, polypropylene and polyethylene terephthalate (PET), and usually have a low melting point. The melting temperature of the resin film 3 is 100 to
About 120 ° C, the melting temperature of the high melting point resin film 2 is 180
℃ or above.

It is preferable that these two resin films 2 and 3 are the same or similar resins as much as possible, and it is most preferable that the resin forming the foamed molded article 1 is also the same or similar resin.

Particularly, what is considered to be most practical is a foamed molded product and both resin films made of polypropylene. However, it goes without saying that this is not a limitation.

The high-melting point resin film 2 and the low-melting point resin film 3 are arranged by sandwiching the low-melting point resin film 3 on the rough surface of the foamed molded article 1, and the low-melting point resin film 3 is formed by an appropriate heating means. The high melting point resin film 2 is laminated on the surface of the foamed molded article 1 by melting the film 3 by heating it to a temperature exceeding the melting temperature.
At this time, the finely rough surface of the foamed molded product 1 is seen through the high melting point resin film 2, and the glaze pattern or finely rough surface of the surface has a unique appearance and reveals a pattern such as a satin pattern. Close.

Further, when laminating with a film, the cross-section of the foamed resin cells on the rough surface of the foamed molded article 1 is positively made into an uneven pattern by the heating temperature, heating time and pressing force of the heating means,
It is also effective to form an uneven pattern on the surface by laminating it with a film.

The above description is for the case where the foamed molded body 1 is a single body of a required form. However, the foamed molded body is once molded into a block B having a required area and an appropriate thickness, and then this is molded. It is possible to slice-cut in the thickness direction to form a plate-shaped foam molded body 1'having a required thickness.

FIG. 2 shows an embodiment of such a method, and shows a situation in which the foam molded body molded as the block body B is slice-cut into a plurality of foam molded bodies 1 '. When the block body B is molded in this way, a plurality of foam molded bodies 1'having a predetermined shape are formed by simply cutting the slice,
At the same time, the cut surface becomes a fine rough surface, and after that, the high-melting resin film is superposed on the cut rough surface in the same manner as described above via the low-melting resin film, and then the low-melting resin film is melted to improve the The melting point resin film is fusion-bonded and laminated on the rough surface of the foamed molded product 1 ', and a pattern such as a satin pattern is revealed through the high melting point resin sheet.

Thus, the surface appearance of the in-mold foam molded article is made beautiful and the range of use of the in-mold foam molded article is expanded. In particular, as shown in FIG. 3, a developed pad material is formed as a heat insulating pad material for the battery, and the bent portion 4 formed thinly folds the battery to cover the periphery of the battery, resulting in a beautiful appearance and light weight. Therefore, the workability of attachment and detachment is good, and it is possible to obtain a heat insulating pad for a battery that sufficiently has the quality characteristics required for a battery shield.

[0023]

As described above, according to the present invention, a high melting point resin film is laminated by melting a low melting point resin film on a relatively rough surface of an in-mold foam molded article. Improves the surface of the molded body due to foaming in the mold, which was restricted in use due to the exposed hexagonal pattern and rough surface,
On the contrary, it is possible to give a beautiful appearance as a pattern like a satin pattern by seeing through the laminated film with a fine rough surface, and also to actively form an uneven pattern to expand the range of its use, Since it is a molded product, it can be molded into various forms, and it can easily enter the field where there is no suitable pad material such as battery shield, and it can provide the pad material required for battery shield. Have.

Moreover, since the in-mold foam molding is used,
It is possible to form a plurality of molded products at once by once molding with a block body and performing a slight cut, and it is possible to significantly improve the production efficiency and significantly reduce the cost.

Further, the heat insulating pad material obtained by the present invention is effective not only for preventing discharge at low temperature when it is used for heat insulation of a battery but also for preventing rise of temperature in summer and preventing evaporation of electrolyte. In addition, it has various properties such as fit property to battery, easiness of transferring discharge battery, oil and chemical resistance, adsorption of oil, water and dust by surface skin layer, and prevention of water absorption. Moreover, when the foamed molded product and the resin film are formed of a single material, various excellent effects such as excellent recyclability are expected.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a film polymerization state according to one example of the method of the present invention.

FIG. 2 is a perspective outline view showing a foamed molded body and a slice cut state showing another advantageous implementation of the method of the present invention.

FIG. 3 is a schematic perspective view showing an example in which a pad material according to the method of the present invention is used for a battery shield.

[Explanation of symbols]

 1,1 'Foamed body 2 High melting point resin film 3 Low melting point film B Block body

Claims (5)

[Claims] 1. A high melting point resin film is superposed on the surface of an in-mold foamed article having a rough surface by a bead method via a low melting point resin film, and the low melting point resin film is melted by heating to form a high melting point film. A method for producing a heat insulating pad material, which comprises laminating the surface of a foamed molded article. 2. A block body having a required expansion area and a thickness is formed by in-mold foaming by a bead method, the block body is slice-cut into a plurality of plate-like bodies having an appropriate thickness, and the cut fine coarse particles are cut. Laminating a high melting point resin film on the surface via a low melting point resin film, melting the low melting point resin film by heating, and laminating the high melting point resin film on the cut surface so that the fine rough surface pattern of the cut surface can be seen through. A method for manufacturing a heat insulating pad material, comprising: 3. A film is obtained by positively making the foamed resin cell cross section of the rough surface a concavo-convex pattern by the heating temperature, heating time and pressing force of a heating means for laminating the rough surface of the cut foamed molded article with the film. The method for producing a heat insulating pad material according to claim 1 or 2, wherein an uneven pattern is formed on the surface of the laminated body when laminated with 4. The heat insulating pad according to claim 1, wherein the foamed molded body is a foamed polypropylene molded body, and the low melting point resin film and the high melting point resin film are a low melting point polypropylene resin film and a high melting point polypropylene resin film. Method of manufacturing wood. 5. A high melting point resin film is laminated on the surface of an in-mold foam molded article having a rough surface by a bead method through a molten layer of a low melting point resin film so that the rough surface of the foam molded article can be seen through. Insulation pad material characterized by.