KR830002425B1 - Low foaming thick plate manufacturing method - Google Patents

Abstract

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Description

Low foaming thick plate manufacturing method

The present invention relates to a method for industrially producing a low foamed plastic thick plate as a simple facility. Conventionally, examples of using wood as a material are materials such as concrete panels, scaffolding for construction, construction, civil engineering, etc., which are light, have high mechanical strength, excellent weather resistance, water resistance, acid resistance, alkali resistance, etc. It is desired to be produced.

However, for example, a low foamed molded article such as polyethylene, polypropylene, polyvinyl chloride, or ABS resin, that is, producing a product having a specific gravity of about 0.4 to 0.7, a thickness of 10 mm or more, and at the same time having a uniform bubble distribution is a conventional foam press. (Press) In the molding method, in the non-crosslinking method such as the degradable foaming method, the volatile foaming method, and the gas body foaming method, it is difficult to achieve the homogeneity of the product due to the poor temperature distribution, and the electron irradiation method or the peroxide. Crosslinking methods such as water are inadequate for producing a low foaming plate.

This invention aims at eliminating the difficulty of the conventional manufacturing method as described above, and manufacturing a plastic low foaming plate having a large desired thickness and mechanical strength by a new industrial method by simple equipment.

In other words, the present invention is a homogeneous low-foaming plastic sheet already produced by a method commonly used, for example, extrusion foaming, for example, a decomposable blowing agent, azodicarbonamide, dinitrosopentamethylene tetramine, 4, 4 These are wrapped in layers on the basis of low foamed polyethylene having a thickness of 2 to 4 mm manufactured by extrusion foam molding using oxybisbenzenesulfonyl hydrazide, azobis isobutyl nitrile, toluene sulfonyl hydrazide, and the like. There is also a method of producing a homogeneous low-foaming thick plate, but by stacking these as they are, heating and pressurizing them to heat the foam having a very low thermal conductivity to reach the laminated surface to the application state, so that the heated area is rather fluid To pressurize the foam to cause loss of bubbles and movements, and to produce a homogeneous thick plate of foam distribution. It is difficult.

On the other hand, it is conceivable to use an adhesive for bonding the lamination, but it is difficult to operate and has a bad working environment. In particular, polyolefins such as polyethyllan and polypropylene are not effective and practical adhesive materials.

The low-foam thick plate manufacturing method according to the present invention makes it possible to produce a low-foam thick plate that is completely welded and practically excellent in a simple facility and operation without changing each of the laminated plates without changing their specific gravity, bubble distribution, and the like.

In other words, a sheet-shaped conductor, for example, is formed between each low-foaming sheet by stacking sheets of foamed molding, for example, 2 to 4 mm, to a desired specific gravity, and stacking sheets of a desired thickness. For example, a metal mesh, carbon fiber fabric, and a plastic film mixed with a conductor are laid out to maintain a constant thickness, while the joule heat generated in the conductor through current from terminals installed on both sides is a low-foaming conductor. It is blocked by the end plate and rises, the adjacent low-foamed end plates are melted, and each end plate is welded. After electrostatic and cooling, the end plates are tightly integrated to produce a desired low-foam laminated thick plate.

Hereinafter, in this invention, it demonstrates concretely according to implementation by a polyethylene resin.

Example 1

According to the extrusion method, a low-foam single sheet (90cm × 180cm) (0.58 specific gravity) with a thickness of 3mm is prepared, and four pieces of feathers are laid, and a steel metal net (so-called glass net) is laid out between each end plate to fix the thickness and brush on both sides. By using a phase terminal for 30 seconds, the current (AC, 100V) was cooled down to obtain a fully foamed, low-foamed polyethylene thick plate having excellent thickness of 12 mm, specific gravity 0.60, and peel strength between laminates.

Example 2

Polyethylene (specific gravity 0.92) film (thickness: 0.03mm) made of a low foaming single plate (90 cm × 180 cm) with a thickness of 2.5 mm and a specific gravity of 0.60 by stacking four pieces of this, stacked and mixed with a 1% graphite powder weight ratio between each single plate. And spread out, while maintaining a constant thickness through a current (AC, 100V) for 1 minute, and allowed to cool to obtain a low-foam polyethylene thick plate that does not bend because the peel strength and mechanical strength of specific gravity 0.62, 10mm thick. Furthermore, in the current, either DC or AC can be used, and in particular, it is not necessary to increase the frequency. In order to keep the thickness of the plate constant, no pressure is required, so a simple multi-stage framework can be prepared, and the interval between each plate can be kept constant. It is not necessary and can prevent the product from bending. Furthermore, in order to improve the adhesive effect of the laminate again, the objective can be achieved by applying a synthetic resin coating to the dielectric to be spread or inserting a synthetic resin film between the dielectric and the end plate or spraying the synthetic resin powder. have.

As described above, the present invention has completed a novel industrial method of manufacturing by conventional difficult operation, and is excellent in properties such as concrete panels, building scaffolding, and other properties such as weather resistance, water resistance, chemical resistance, etc. It was possible to manufacture this large material by using it as an inexpensive raw material (use of recycled raw material is also possible).

Claims (1)

Stack two or more low-foam plastic single plates, insert a sheet-like conductor between each laminated plate to prevent expansion of thickness, and connect terminals on both sides. A low foaming thick plate manufacturing method characterized by integrally bonding by using joule heat generated by passing a current.