JPS61293844A - Flexible tubular body - 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 [Field of Industrial Application] The present invention relates to a flexible tubular body useful as a control cable for automobiles, autopilots, etc.

[Conventional technology and problems]

Control cables are used as brake cables and clutch cables in automobiles, and their inner strands slide smoothly inside the flexible outer tubular body to minimize the loss of force applied to one end. ◇ Conventionally, in order to achieve the above-mentioned smooth sliding, a plastic tube was inserted into the flexible outer tubular body, and the inner stranded wire was placed inside this plastic tube. However, since inserting this plastic tube requires a lot of effort and is difficult to manufacture, the inventors first developed a flexible tube made by winding a metal band coated with resin in a spiral shape. A sexual tubular body was proposed. Since the interior of this new flexible tubular body is coated with the above-mentioned resin, there is no need to insert a plastic tube.

By the way, when a metal band coated with resin is spirally wound, a relatively large force is applied to the resin coating layer, so depending on the resin, the coating layer may be peeled off and damaged during processing. Furthermore, there are cases where the resin coating layer is required to have heat resistance, such as when the control cable is installed near the engine room.

[Means for solving problems]

The present invention aims to provide a flexible tubular body that is easy to manufacture and eliminates the problems such as peeling of the coating layer that occur when a coated metal strip is spirally wound. Furthermore, it is an object of the present invention to provide a flexible tubular body having excellent heat resistance.

That is, the present invention is a tubular body formed by spirally winding a metal band coated with resin, characterized in that the resin is polyamide-imide-based.

[For production]

The amide-imide layer made of polyamide-imide resin has excellent heat resistance and exhibits extremely excellent processing deterioration resistance when coated on a metal strip. [Example] Figure 1 shows an example of the present invention. An example of the structure of a flexible tubular body is
Figure 2.3 shows an example of the structure of the coated metal strip used in the present invention.

The flexible tubular tube 1 shown in FIG. 1 is formed by winding a metal band 2 having a polyamide-imide layer 3 in a spiral shape as shown. 4 is made of a heat-resistant organic polymer, silicone rubber, polytetrafluoroethylene, polyetherketone, polyamide, etc., which is formed on the tubular body 1 by a press method or the like, although it is not necessary. It is a sheath, and 5 is an inner twisted wire that is inserted into the tubular body 1 and is slidably installed.

The polyamide-imide layer 3 can be formed by coating and baking a commercially available polyamide-imide varnish on the metal strip 2 under normal conditions using a known coating method such as a dip coating method or an electrodeposition coating method. Imide-based varnishes include, for example, those conventionally used for manufacturing multi-winding wires, as well as polyamide-imide-based varnishes having the structure of the following formula, which have imide groups and amide groups in the polymer chain.
I can give you r things.

etc. This compound can be obtained, for example, by reacting a tricarboxylic acid or a derivative thereof with a diamine.

The metal band 2 is made of iron, steel, aluminum, copper, etc., and has a width of about 2 to 5 W and a thickness of about 0.5 to 2.0 W. OJflll
The appropriate thickness of the polyamide-imide layer 3 is about 20 to 100 meters.

The metal strip 2 used in the present invention may have only a polyamide-imide layer 3 as shown in FIG.
As shown in FIG. 3, it may have a primary layer 3I formed by applying and baking a different type of varnish directly above the metal band 2. Pfimari single layer 3' is made by applying varnishes conventionally used in the production of insulated enameled wires, such as polyester varnish, acrylic varnish, and polyesterimide varnish, by dip coating or electrodeposition coating, and then baking. You can form it well. Particularly, when electrocoating is used, it is advantageous when a coated metal strip is spirally wound, in which a portion of the corner of the metal strip is sufficiently coated with varnish. The presence of a lubricant on the surface of the polyamide-imide layer 30 further reduces damage to the layer 3 during the spiral winding process of the metal strip, and further reduces the damage to the inner stranded wire 5 inserted into the resulting flexible tube-shaped loop 1. The sliding movement within the tubular body becomes even smoother.

Examples of lubricants include silicone-based lubricants (commercially available products include Dow and Corning's FSXB2724 and 272).
5. Toray Silicon Co., Ltd.'s 5H-29PA, 30PA, etc.), fluorine-based lubricants (commercially available products include Daikin Industries' Polyflon D-1, Sato's AS Coat Todoroki 6, etc.), or aliphatic lubricants (commercially available products such as Polyflon D-1 and Sato Co., Ltd.) Then Hoechst's WAXE,
Some lubricants such as sb, silicone lubricants, and aliphatic lubricants (such as Ishihara Pharmaceutical Co., Ltd.'s UNI-CON) contain 0.0% in the polyamide-imide varnish used for coating and baking.
It may be added in advance at about 1 to 1.0% by weight, or it may be applied on the polyamide-imide layer 3 on the metal strip 2 before or after being spirally wound. Among the above lubricants, silicone-based and fluorine-based lubricants are particularly preferred because they have excellent water resistance and salt spray resistance.

Production Example 1 Polyamide-imide varnish (Hitachi Chemical's HI-405-30) on a 1.0 ff x 2.6 fl rectangular iron wire
was applied six times and baked, and the resin ratio to the varnish was 0. F
) A coated metal strip of the same coating thickness of 0.035 mX O,053 was coated once using a varnish to which silicone lubricant 5H-29PA (manufactured by Toshi Silicone Co., Ltd.) was added at the ratio of % electric storage and baked. I got it. The metal strip thus obtained was then stretched to a length of 30 m.
Winded into a spiral at a line speed of 7 minutes, with an inner diameter of 3.5
A tubular body was obtained after a few days. This spiral winding process did not cause any peeling of the polyamide-imide layer.

Production Example 2 1.0 tl x 2.6 tm flat iron wire, which had been electrodeposited and baked with acrylic varnish (manufactured by Ryoden Kasei Co., Ltd., V-551-20), was used. The polyamide-imide varnish (without lubricant) used in Example 1 was applied and baked three times to obtain a coated metal strip with a film thickness of 0.039 m x 0.052 nm. Furthermore, under the same conditions as Manufacturing Example 1, the inner diameter was 3 and 5.
A flexible tubular body of sw was obtained.

This spiral winding process did not cause peeling of the daryamide-imide layer.

〔Effect of the invention〕

The metal strip having a polyamide-imide layer is difficult to peel or break due to external force applied during spiral winding, so the flexible tubular body of the present invention is easy to manufacture and has high quality. It is. In addition, polyamide-imide has excellent resistance to rainwater and salt water as well as heat resistance, so the control cable made of the removable tubular body of the present invention can be used near the engine room of an automobile or exposed to water.
It can also be wired in areas exposed to salt water, etc. Furthermore, if a lubricant layer exists on the surface of the polyamide-imide layer,
The spiral winding process described above is easier, and the inner stranded wire can slide more smoothly inside the tubular body of the present invention.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view of an embodiment of the present invention, FIGS.
Each figure is a sectional view of a coated metal strip used in the present invention. 1: Flexible tubular body, 2: Metal band, 3: Polyamide-imide layer, 3I niblimary single layer, 4: Sheath, 5: Inner stranded wire◇

Claims (4)

[Claims] (1) A flexible tubular body formed by spirally winding a metal band coated with a resin, characterized in that the resin is polyamide-imide-based. (2) The flexible tubular body according to claim 1, further comprising a primary layer formed by applying and baking a varnish between the metal band and the polyamide-imide layer. (3) The flexible tubular body according to claim 2, which has a primary layer formed by applying varnish using an electrodeposition coating method. (4) The flexible tubular body according to any one of claims 1 to 3, which has a lubricant layer on the surface of the polyamide-imide layer.