JPS5941604Y2 - Polyolefin sheathed waveguide - Google Patents

Description

[Detailed description of the invention] The present invention relates to a waveguide made by overlapping both ends of metal tape (hereinafter simply referred to as a metal tape waveguide), and in particular, a polyolefin sheathed metal tape with excellent salt damage resistance. It is related to waveguides.

The molded portions at both ends of the metal tape of the polyolefin sheath metal tape waveguide, the waveguide, and the polyolefin sheath are bonded with an adhesive.

Adhesives used for such purposes must have adhesive properties for both metals and polyolefins, but if the waveguide is used for ships or in coastal areas, Since there is always a risk that the adhesive part may be immersed in seawater due to seawater intrusion from poor connections, there is always a possibility of salt damage. It is necessary to maintain the

The conventionally known polyolefin sheathed metal tape waveguide is
Because the adhesive used there has poor salt damage resistance,
There is a drawback that the adhesive portion peels off during long-term use, causing deformation of the cross-sectional shape of the waveguide, and deterioration of electrical transmission characteristics.

The present invention proposes a polyolefin sheathed metal tape waveguide that eliminates these drawbacks. It is characterized by being bonded with a composition consisting of modified polyethylene or modified ethylene-unsaturated carboxylic acid ester copolymer grafted with the anhydride, 95 to 70 weight ★, and polyethylene 5 to 30 weight φ. .

Hereinafter, the present invention will be explained in detail with reference to Examples.

The attached figure is a perspective view of an embodiment of the present invention with the waveguide exposed, and 1 is an A7. A metal tape waveguide with an elliptical cross section is constructed by overlapping both ends of a tape made of a highly conductive metal such as Cu, as shown in the diagram, and 2 is made of polyolefin such as polyethylene or poly4-methylpentene-1. Sheath 3 is an adhesive layer.

The overlapping portion of the metal tape waveguide 1 and the metal tape waveguide 1 and polyolefin sheath 2 are firmly adhered by an adhesive layer 3.

The constituent material of the adhesive layer 3 consists of the composition as described above.

Examples of ethylene-unsaturated carboxylic acid ester copolymers include copolymers of unsaturated carboxylic acid esters such as methyl, ethyl, and butyl of unsaturated carboxylic acids such as acrylic acid and methacrylic acid, and ethylene; - Examples of β-unsaturated carboxylic acids include acrylic acid, methacrylic acid, maleic acid, etc., and such α-β-unsaturated carboxylic acids or their anhydrides can be used to graft polyethylene or ethylenically unsaturated carboxylic acid ester copolymers. However, the amount of grafting is about 0.1 to 20% by weight.

Grafting methods are described, for example, in U.S. Pat. No. 2,987,5
It is described in the specification of No. 01, etc.

The blending amount of polystyrene is preferably 5 to 30 weight □□□, particularly 15 to 20 weight ★.

If the amount of polystyrene is less than 5% by weight, the adhesive strength to metal will be low, while if it exceeds 30% by weight, the compatibility between modified polyethylene or modified ethylene-unsaturated carboxylic acid ester copolymer and polystyrene will be poor. .

An example of the composition used as an adhesive in the present invention is Dumilan J-201, a trade name manufactured by Mitsui Polychemical Co., Ltd.

In the present invention, for example, a metal laminate tape, which is made by laminating an adhesive layer 3 on one side of a metal tape that constitutes a waveguide, is placed vertically on a core that can be formed into a desired waveguide cross-sectional shape to guide the waveguide. The overlapping parts of the metal tapes are heated and welded, and immediately fed to an extruder to extrude polyolefin onto the waveguide to form a sheath. At the same time, the heat generated during extrusion of the polyolefin creates an extruded polyolefin layer. (sheath) and a waveguide with an adhesive layer.

Dumilan J-20 manufactured by Mitsui Polychemical Co., Ltd. was placed on an aluminum tape with a thickness of 0.25ii and a width of 82mm.
1 (polystyrene content: about 20% by weight) about 0.08i
An aluminum laminate tape laminated with a thickness of i is processed into an elliptical waveguide with a long axis outer diameter of about 29 mm and a short axis outer diameter of about 15 mm, and polyethylene is extruded on top of it at 200°C to a thickness of 2.5 mm. A waveguide of the present invention was manufactured by applying a polyethylene sheath.

A waveguide was produced that differed from the above example only in that the laminate adhesive layer was an aluminum laminate tape made of ethylene-vinyl acetate-glycidyl methacrylate terpolymer instead of the above-mentioned Dumilan for relative softness. When the following salt damage resistance test was conducted on the waveguides of these Examples and Comparative Examples, the Comparative Example showed partial peeling of the bonded area on the 15th day from the start of the test, and v, s, W, R ( Although the voltage stabilizer ratio (voltage stabilizer ratio) increased from the initial value of 1.02 to 1.2, the example still showed stable performance with V, S, W, and R exceeding 1.02 even after 30 minutes after the start of the test. was holding it.

(Salt damage resistance test) A waveguide sample approximately 20 m in length was maintained at 20°C.

Immerse it in seawater, take it out periodically, wash the inside and outside of the waveguide with ion-exchanged water, dry it, and then wash it in the usual way.
, S, W, and H are repeated to examine changes over time in V, S, W, and R of the waveguide due to immersion in seawater.

[Brief explanation of drawings]

The attached figure is a perspective view of an embodiment of the present invention, in which 1 is a waveguide;
2 is a polyolefin sheath, 3 is an adhesive layer.

Claims (1)

[Scope of utility model registration request] The overlapping portion of the waveguide, which is constructed by overlapping both ends of metal tapes, and the waveguide and polyolefin sheath are made of modified polyethylene grafted with α-β unsaturated carboxylic acid or its anhydride. Or modified ethylene-unsaturated carboxylic acid ester copolymer 95 to 70 weight φ
A polyolefin sheathed waveguide, characterized in that the polyolefin sheathed waveguide is bonded with a composition consisting of polystyrene and 5 to 30 weight φ of polystyrene.