JPS60254520A - Method of producing water crosslinked rubber plastic coated wire and cable - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Background and Objects of the Invention] The present invention relates to a method for manufacturing water (silane) crosslinked rubber/plastic coated electric wires/cables.

Previously proposed cross-linked rubber, plastic-coated wires,
Cable manufacturing methods include a manufacturing method using electron beam irradiation and a manufacturing method using chemical crosslinking using peroxide.

On the other hand, recently, a production method using so-called water crosslinking has been industrialized, in which a hydrolyzable unsaturated silane is mixed with an organic polymer and then crosslinked with water. especially,
Among the above manufacturing methods, the method for manufacturing electric wires and cables by water crosslinking is attracting attention because crosslinking is possible even at room temperature by soaking the rubber/plastic layer in water, and crosslinking is easy.

By the way, if we look at a specific method for manufacturing electric wires and cables using water bridges, it is generally carried out through the following manufacturing steps.

An insulated wire is manufactured by extruding and coating a conductor with a water-crosslinking material in which a hydrolyzable unsaturated silane is mixed with an organic polymer such as polyethylene, and the insulated wire is further wound around a drum. Thereafter, the drum wrapped with the insulated wire is left in a high temperature, high humidity room for a predetermined period of time.

However, when we look at this water bridge method, we find that when there are many winding layers on a 9-drum, it takes a considerable amount of time to water bridge, especially for insulated wires located near the center of the drum. At present, the crosslinking time is longer than the actual crosslinking reaction time.

An object of the present invention is to provide a method for manufacturing water-crosslinked rubber/plastic coated electric wires/cables, which eliminates the drawbacks of the prior art described above and enables uniform crosslinking in a short time.

[Summary of the invention]

A process of forming an insulated wire/cable by extruding water-crosslinkable rubber/plastic directly onto the conductor circumference or through an arbitrary coating layer, and forming an appropriate number of through holes in the body or brim of the insulated wire/cable. A step of winding the drum onto a drum or reel provided with a It is in the manufacturing method.

In the present invention, it goes without saying that all generally known water-crosslinkable rubbers and plastics can be used, but for example, polyethylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid or its ester copolymer, etc. can be used. Generally known hydrolyzable unsaturated silanes such as vinyl silane are added to polymers such as ethylene-propylene (or hasien monomer) copolymers, ethylene-butylene copolymers, or chlorinated polyethylene. A mixture is used.

[Example] An example of the present invention will be described below. First, a water-crosslinkable polyethylene prepared by mixing a hydrolyzable unsaturated silane, a radical, a siloxane condensation catalyst, etc. The periphery of the conductor is extruded and coated to form an insulated wire coated with water-crosslinkable polyethylene.

Winding the insulated wire onto a drum having a large number of through holes in the body and brim, and then leaving the drum with the insulated wire wound thereon in a high temperature and high humidity room for a predetermined time;
The moisture on the outer peripheral surface of the water-crosslinkable polyethylene is heated, and the polyethylene is crosslinked to complete the production.

According to one embodiment of the present invention, the process is carried out using a drum in which a large number of through holes are formed, so that the steam in the high temperature and high humidity chamber can smoothly pass through each of the through holes provided in the drum. Since the water is evenly distributed near the insulated wire located at the center of the drum, the insulated wire can be uniformly water-crosslinked in a short time, and as a result, it is expected that the crosslinking efficiency will be significantly improved. can.

It should be noted that the present invention is not limited to the one embodiment described above, but can also be used to manufacture cables having various other structures.

〔Effect of the invention〕

As described above, according to the present invention, since the water bridge of insulated wires and cables is performed using a drum provided with through holes, the circulation of heating steam toward the center of the drum is improved, and therefore the electric wires・Cable water cross-linking can be done uniformly in a short time, and its industrial value is extremely high.

Claims (1)

[Claims] 1. Forming an insulated wire/cable by extruding water-crosslinkable rubber/plastic onto the circumference of the conductor directly or through an arbitrary coating layer, and attaching an appropriate number of the insulated wire/cable to the body or collar. Water crosslinking characterized by comprising the steps of: winding the drum onto a drum or reel provided with through holes; and placing the drum in a high temperature, high humidity chamber to water crosslink the water crosslinkable rubber/plastic. Manufacturing method for rubber/plastic coated wires and cables.