JPH077275A - Shell housing - Google Patents

Abstract

PURPOSE:To obtain a shell housing in which a metal part and a resin part can be easily separated at the time of discarding by incorporating a chemical foaming agent in synthetic resin of a lower layer in contact with a shell molded form. CONSTITUTION:An adhesive synthetic resin layer 5 in which a lower layer 2 made of EVA, EEA, etc., having excellent adhesive properties with a metal for constituting a shell molded form, an upper layer 3 made of resin such as polyethylene, polypropylene, etc., having excellent adhesive properties with thermoplastic resin for forming an inner mechanism, and an intermediate adhesive layer 4 made of resin having excellent adhesive properties with resin for forming the layers 2, 3 are piled up in the order of the layers 2, 4 and 3 is provided in an inner surface of the shell molded form 1. In this case, the resin of the layer 2 in contact with the form 1 contains a chemical foaming agent. Thus, a metal shell rigidly adhered to the mechanism of the housing, and even in the case of discarding, when it is heated, the resin and the metal are easily separated to be easily reused.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer shell housing for electronic devices, automobile-mounted devices, etc., which is thin, lightweight and easy to dispose of.

[0002]

2. Description of the Related Art Conventionally, as an outer shell casing for electronic equipment, automobile-mounted equipment, etc., a metal plate formed by press working or the like and assembled by means such as welding or bolting has been used. However, in recent years, with the advancement of functions, thin type,
There is a demand for lightweight and complex-shaped casings, and accordingly, outer shell casings are being manufactured by injection molding of a thermoplastic resin.

[0003]

However, the outer shell housing formed by injection molding of a thermoplastic resin is not only limited in terms of strength and the like but also thin and lightweight, and in the case of manufacturing a large housing. However, there is a problem that an injection molding machine having a large mold clamping pressure is required, and the manufacturing apparatus becomes large-scale.

Further, when the outer shell housing is entirely made of a thermoplastic resin, it is usually necessary to apply a flame retardant treatment.
To this end, a large amount of halogen-based flame retardant must be blended, which may adversely affect the environment. Further, since it is difficult to recycle a resin from a molded product that has been subjected to various processes, it cannot be said to be preferable from the viewpoint of effective use of resources.

The present invention has been made in order to solve these problems, and a metal outer shell and an internal mechanical portion made of a thermoplastic resin are firmly bonded via an adhesive synthetic resin layer,
The purpose is to provide an outer shell housing that combines the strength and noncombustibility of metal, the functionality and lightness of resin, and that facilitates the separation of the metal part and resin part at the time of disposal. is there.

[0006]

Means for Solving the Problems As a result of intensive studies to achieve the above object, the present inventors have made a specific layer of an adhesive synthetic resin layer contain a chemical foaming agent, and have excellent characteristics under normal conditions. It was found that the above-mentioned object can be achieved by foaming and separating the metal part and the resin part at the time of disposal processing, and the present invention has been completed.

That is, according to the present invention, an outer shell molded body formed by molding a metal plate into a predetermined shape as an outer shell housing, an adhesive synthetic resin layer provided on the inner surface of the outer shell molded body, The adhesive synthetic resin layer is formed of an internal mechanism part obtained by injection-molding a thermoplastic resin on the adhesive synthetic resin layer, and the adhesive synthetic resin layer is made of a synthetic resin having adhesiveness to a metal forming the outer shell molded body. An outer shell molded body, which comprises an upper layer made of a synthetic resin having adhesiveness to the thermoplastic resin, and an intermediate adhesive layer interposed between the upper and lower layers to adhere the upper and lower layers to each other. The outer shell housing is characterized in that the synthetic resin of the lower layer in contact with is containing a chemical foaming agent.

The present invention will be described in detail below.

The metal plate used in the present invention is made of a metal such as iron, aluminum or zinc alloy that can be recycled and can be easily processed by pressing, etc., and has a desired strength and a thickness of 0.5 to 0.8 mm. It is possible to use a plate-like body in the range of.

Further, examples of the thermoplastic resin which forms the internal mechanical portion by injection molding include polyethylene, polypropylene, polyamide, polystyrene, polycarbonate, polyethylene terephthalate, ethylene-vinyl alcohol copolymer and the like, which may be used alone or as a mixture. Can be used.

Further, among the three layers constituting the adhesive synthetic resin layer, the lower layer which is in direct contact with the outer shell molded product formed from the metal plate is an ethylene-vinyl acetate copolymer (EV).
A) and ethylene-ethyl acrylate copolymer (EE
A) or a ternary copolymer of these copolymers and polyolefin, which is made of a synthetic resin having an adhesive property with the metal constituting the outer shell molded body. In addition, the upper layer that is in direct contact with the internal mechanism is polyethylene, polypropylene,
A resin such as polyamide, polystyrene, polycarbonate, polyethylene terephthalate, or ethylene-vinyl alcohol copolymer, which is easy to process into a film, and which is composed of a thermoplastic resin that has adhesiveness to the internal mechanical part, and in particular the internal mechanical part. It is desirable to use the same thermoplastic resin as. Further, the intermediate adhesive layer is preferably composed of a copolymer of the synthetic resin forming the lower layer and the synthetic resin forming the upper layer, or a resin modified by mixing both. In addition, as a commercial item such as EVA or EEA for the lower layer, Novatec AP (manufactured by Mitsubishi Kasei Co., Ltd., trade name), N Polymer (manufactured by Nippon Petrochemical Co., Ltd., trade name), Shorex (Showa Denko KK, Trade name), Admer (trade name, manufactured by Mitsui Petrochemical Industry Co., Ltd.), Modic (trade name, manufactured by Mitsubishi Petrochemical Co., Ltd.), Nucrel (trade name, manufactured by Mitsui DuPont Polychemical Co., Ltd.), etc. Alternatively, they can be mixed and used.

Further, as a chemical foaming agent to be added to the adhesive synthetic resin of the lower layer, azodicarbamide (ADCA),
Azobisisobutyronitrile (AIBN), dinitrosopentamethylenetetramine (DPT), 4,4'-oxybisbenzenesulfonyl hydrazide (OBSH), paratoluenesulfonyl hydrazide (TSH), barium azodicarboxylate, etc. These may be used alone or in combination. It is desirable to add the chemical foaming agent in an amount of 1 to 10% by weight based on the adhesive synthetic resin. If the addition ratio is less than 1% by weight, the foaming pressure is insufficient, and if it exceeds 10% by weight, the processing of the film is hindered, which is not preferable.

In the present invention, the adhesive synthetic resin layer comprising the lower layer, the intermediate adhesive layer and the upper layer is 30 in total.
A thickness of ~ 100 μm is desirable. Further, in order to provide such an adhesive synthetic resin layer on the inner surface of the outer shell molded body, the lower layer, the intermediate adhesive layer and the upper layer are sequentially extruded and laminated on one surface of the metal plate, or coextruded.
After pressing the three-layer structure film to the metal plate by heat pressing or heat roll, press-mold the resulting laminated metal plate so that the adhesive synthetic resin layer is on the inside, and form the outer shell shape of the specified housing. A molding method can be adopted.

[0014]

In the outer shell housing of the present invention, the outer shell molded body formed by molding the metal plate is formed on the outside, so that the mechanical strength is high and the overall thickness can be made thin and lightweight. In addition to being capable, it has excellent fire resistance and flame retardancy. Further, since the internal mechanism part of the thermoplastic resin is formed by injection molding inside such a metal outer shell molded body, only the minimum necessary part can be molded as the internal mechanism part. Therefore, a large injection molding machine having a large mold clamping pressure is not required.

Further, since the adhesive synthetic resin layer is provided between the metal outer shell molded body and the internal mechanism portion made of the thermoplastic resin, the adhesive strength between the outer shell molded body and the internal mechanism portion is high. Is large, and the design appearance is not impaired by the adhesion.

Furthermore, when the adhesive synthetic resin layer is a single layer, it has excellent adhesiveness to the metal constituting the outer shell molded body,
Moreover, it is necessary to select a resin having good adhesiveness to the thermoplastic resin forming the internal mechanism portion, and therefore, the type of the thermoplastic resin forming the internal mechanism portion is also limited,
In the outer shell casing of the present invention, the adhesive synthetic resin layer is composed of a lower layer of a synthetic resin having a good adhesive property with a metal, an upper layer of a synthetic resin having a good adhesive property with a thermoplastic resin, and both layers. Since it has a three-layer structure with an intermediate adhesive layer that adheres to each other, the type of thermoplastic resin that constitutes the internal mechanism is not limited, and various types of resins can be freely selected to form the internal mechanism. it can.

[0017]

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

FIG. 1 is a sectional view showing an embodiment of an outer shell housing of the present invention, and FIG. 2 is an enlarged view showing a one-dot chain line circle A portion in FIG.

In FIGS. 1 and 2, reference numeral 1 denotes an outer shell formed body formed by pressing a metal plate made of aluminum or zinc alloy into a predetermined outer shell shape.
The inner surface of the polyethylene has a lower layer 2 made of EVA or EEA having excellent adhesiveness with the above-mentioned metal forming the outer shell, and a polyethylene having excellent adhesiveness with a thermoplastic resin forming an internal mechanism portion described later. An upper layer 3 made of a resin such as polypropylene, and an intermediate adhesive layer 4 made of a resin having excellent adhesiveness with the resins constituting the lower layer 2 and the upper layer 3, respectively.
An adhesive synthetic resin layer 5 is provided in which three layers are laminated in order of a lower layer 2, an intermediate adhesive layer 4, and an upper layer 3. Further, an internal mechanism portion 6 made of a thermoplastic resin such as polyethylene, polypropylene, polyamide, or polystyrene is integrally formed on the adhesive synthetic resin layer 5 by injection molding.

As a concrete example of the casing of the embodiment thus constructed, an example of manufacturing a seat cover inside an automobile is shown below. That is, EVA that has excellent adhesion to metal
NOVATIC AP-270L is a chemical foaming agent VINYHALL AC # 3M (ADCA manufactured by Eiwa Chemical Co., Ltd., trade name) 5
Novatic AP-1 which is a synthetic resin having excellent adhesion between the one added by weight% and both polypropylene and EVA
96P and adhesive polypropylene 6200E (trade name, manufactured by Mitsubishi Kasei Co., Ltd.) with thicknesses of 35 μm and 15 μ, respectively
m 2 and 40 μm, and extrusion molding was performed in a film form so as to form 3 layers in this order. Then, the adhesive synthetic resin film obtained was laminated on a 0.6 mm thick aluminum plate with the adhesive polypropylene layer on the outside, and this was placed at 150 ° C.
It was sandwiched by a heat press heated to 1, and crimped. Next, the laminated plate thus obtained is put into a press die, and press working is performed so that the adhesive synthetic resin film is on the inner side.
An outer shell molded body 1 having an adhesive synthetic resin layer having a shape as shown in (a), (b) and (c) was molded. Next, after inserting the molded body 1 into a mold of an injection molding machine, polypropylene 4505J (trade name, manufactured by Mitsubishi Kasei Co., Ltd.) is injection-filled into the cavity to be solidified.
), (B) and (c) respectively, the outer shell housing having the internal mechanism portion 7 was formed.

The outer shell housing of the embodiment thus manufactured is
As shown in Table 1, as compared with the conventional case formed of ABS resin alone, it has a small thickness, is light, and has extremely high strength. Also, the mold clamping pressure during injection molding is small,
Does not require a large injection molding machine.

[0022]

[Table 1]

[0023]

As is apparent from the above description and Table 1, in the outer shell housing of the present invention, the metal outer shell and the internal mechanical portion are firmly bonded, and the thin outer shell is thin, lightweight, and strong. It has good fire resistance and flame retardancy, and if it is heated at the time of disposal, the resin and metal can be easily separated and reused.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an outer shell housing of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a one-dot chain line portion A of FIG.

FIG. 3 is a diagram showing an outer shell molded body with an adhesive layer molded in another embodiment, in which (a) is a front view, (b) is a side view, and (c) is a top view. It is a figure.

FIG. 4 is a view showing an outer shell casing manufactured in the embodiment of FIG. 3, in which (a) is a front view and (b) is a front view.
) Shows a side view and (c) shows a top view.

[Explanation of symbols]

 1 Outer Shell Molded Body 2 Lower Layer Containing Chemical Foaming Agent of Adhesive Synthetic Resin Layer 3 Upper Layer of Adhesive Synthetic Resin Layer 4 Intermediate Adhesive Layer 5 Adhesive Synthetic Resin Layer 6, 7 Internal Mechanism Section

Claims (1)

[Claims] 1. An outer shell molding formed by molding a metal plate into a predetermined shape as an outer shell housing, an adhesive synthetic resin layer provided on the inner surface of the outer shell molding, and the adhesive synthetic resin. Consisting of an internal mechanism part obtained by injection-molding a thermoplastic resin on the layer, wherein the adhesive synthetic resin layer is a lower layer made of a synthetic resin having adhesiveness to the metal forming the outer shell molded body,
An upper layer made of a synthetic resin having adhesiveness to the thermoplastic resin, and an intermediate adhesive layer interposed between the upper and lower layers to adhere the upper and lower layers and contacting the outer shell molded body. An outer shell housing characterized in that a lower layer synthetic resin contains a chemical foaming agent.