JPH084746A - Cable conductive pipe - Google Patents

Abstract

PURPOSE:To stabilize operability for many hours in a cable conductive pipe on which a synthetic resin liner is installed by reducing sliding resistance even in a high temperature service condition without spoiling flexibility by the liner. CONSTITUTION:A steel strand 1a is densely wound in a spiral shape, and a casing 1b composed of synthetic resin such as polypropylene is formed on it by extrusion molding, and a tubular liner 2 composed of a polyamide resin composition having the following composition is inserted inside of this, and a cable conductive pipe A is formed. The polyamide resin composition has the composition formed by blending organopolysiloxane 0.5 to 20.0 pts.wt. having a unit containing an epoxy radical and organopolysiloxane 0.5 to 20.0 pts.wt. having a unit containing an amino group, a carboxyl group, an alcoholic hydroxyl group or a mercapto group to aliphatic polyamide resin 100 pts.wt.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable conduit, and more particularly to a cable conduit having a synthetic resin liner on the inner peripheral surface of the conduit.

[0002]

2. Description of the Related Art The structure of a general cable conduit will be described with reference to FIGS. 1 to 4. The cable conduit is made of flexible metal conduits 1 and 6 and is installed inside the conduit 1. The flexible inner liner 2 is inserted into the inner side of the liner 2 and has a flexible inner liner 3 or 4.

The conduit 1 comprises one flat steel wire 1a densely packed in a spiral shape (FIG. 1), or a large number of round steel wires 7 arranged side by side in a cylindrical shape (FIG. 3). . Also,
The inner cords 3 and 4 are generally formed by twisting one metal wire or a plurality of metal wires, or by providing a synthetic resin coating layer 5 on the outer peripheral surface. The coating layer 5 may be a so-called armor layer obtained by spirally winding a flat steel wire.

The tubular flexible liner 2 reduces the sliding resistance between the conduits 1 and 6 and the inner cords 3 and 4, and makes a sliding noise when operating the inner cords 3 and 4, and a rapid operation. This is effective in preventing the generation of so-called whipping noise that occurs.

Polyethylene, polyacetal, polyamide and the like are generally used as the synthetic resin for forming such a liner. Among them, polyamide is a forming material which is particularly excellent in friction and wear characteristics and heat resistance.

[0006]

However, although the liner made of polyamide is excellent in strength and heat resistance,
There is a problem in that it has physical properties that are inherently hard, the flexibility (flexibility) of the cable conduit is easily impaired, and it may be difficult to smoothly transmit the motive force by the cable conduit having a polyamide liner. There is.

[0007] Further, the cable conduit having a polyamide liner has a problem that when it is used for a long period of time, abrasion powder is generated due to friction between the liner and the inner cable, sliding is not performed smoothly, and operability is deteriorated. is there.

[0008] Here, in order to make the conduit conduit flexible and not to generate abrasion powder, it is conceivable to adopt oil-containing plastic as a material for forming the liner. Such oil-impregnated plastics are made by adding a lubricating oil to a synthetic resin alone, or adding a carrier and a fibrous oil-conducting filler together with a lubricant. To suppress the generation of abrasion powder.

However, the cable conduit equipped with such an oil-impregnated plastic liner is inferior in the stability of the friction coefficient of the liner. For example, when heated, the rate of oil exudation becomes excessive. Since it has drawbacks such as scraping the material, it has not been possible to obtain a conduit having good operability especially under high temperature use conditions.

As described above, in the cable conduit having the conventional synthetic resin liner, the operation resistance of the inner cable is not stable under high-temperature use conditions, and in particular, the cable conduit having the polyamide liner attached is flexible. However, there is a problem in that operability is not transmitted smoothly and the operability is deteriorated during use due to generation of abrasion powder.

Therefore, an object of the present invention is to solve the above-mentioned problems and to slide a cable conduit equipped with a synthetic resin liner even under a high temperature use condition without the flexibility being impaired by such a liner. The aim is to obtain a cord conduit that has low resistance, is stable for a long time, and has good operability.

[0012]

In order to solve the above problems, in the present invention, a flexible conduit, a synthetic resin tubular liner mounted inside the conduit, and a liner inside the liner are provided. In the cable conduit consisting of the inserted flexible inner cable, the liner was formed of the polyamide resin composition having the following composition.

0.5 to 100 parts by weight of an organopolysiloxane having a unit containing an epoxy group with respect to 100 parts by weight of the aliphatic polyamide resin.
A polyamide resin composition comprising 20.0 parts by weight and 0.5 to 20.0 parts by weight of an organopolysiloxane having a unit containing an amino group, a carboxyl group, an alcoholic hydroxyl group or a mercapto group.

Alternatively, the liner is 12-nylon 1
0.5 to 20.0 parts by weight of an organopolysiloxane having a unit containing an epoxy group and 0.5 to 20.0 parts by weight of an organopolysiloxane having a unit containing an amino group or a carboxyl group, relative to 00 parts by weight. It may be a polyamide resin composition containing the above compound.

The details will be described below. The aliphatic polyamide resin, which is the molding material for the liner used in the present invention,
It is an aliphatic polyamide produced by polycondensation of diamine and dicarboxylic acid or polycondensation of aminocarboxylic acid, and ring-opening polymerization of lactam.

When such an aliphatic polyamide is obtained by polycondensation of a diamine and a dicarboxylic acid, adipic acid, pimelic acid, suberic acid, sebacic acid, dodecanedioic acid and the like are used as a raw material for the production. Adopted, as the diamine, hexamethylene diamine,
Octamethylenediamine or the like can be adopted.

Specific examples of such an aliphatic polyamide resin include polyhexamethylene adipamide (6,6--), which is obtained by polycondensation of diamine and dicarboxylic acid.
Nylon), polyhexamethylene azelamide (6,9
-Nylon), polyhexamethylene sebasamide (6,1
0-nylon), polyhexamethylene dodecamide (6,12-nylon), and polytetramethylene adipamide (4,6-nylon). Polycaprolactam (polycaprolactam) is obtained by ring-opening polymerization of lactams. 6-nylon) and polylaurinlactam (12-nylon), and as a product obtained by polycondensation of aminocarboxylic acid, poly-11-aminoundecane (11-
Nylon). The aliphatic polyamide resin used in the present invention may be a mixture of two or more kinds.

Next, the organopolysiloxane having a unit containing an epoxy group or the organopolysiloxane having a unit containing an amino group, a carboxyl group, an alcoholic hydroxyl group or a mercapto group used in the present invention is
It is a so-called modified silicone or modified organopolysiloxane obtained by introducing an epoxy group, an amino group, a carboxyl group, an alcoholic hydroxyl group or a mercapto group into an organopolysiloxane by a well-known chemical method.

The main chemical structure of such an organopolysiloxane includes a polymer structure having dimethylsiloxane, methylphenylsiloxane, trimethylfluoropropylsiloxane, etc. as a repeating unit. The one shown can be adopted. The formula of the modified organopolysiloxane that can be used in the present invention is illustrated below.

[0020]

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[0021]

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In the present invention, the mixing ratio of the organopolysiloxane having a unit containing an epoxy group to 100 parts by weight of the aliphatic polyamide resin is 0.5 to 20.
0 parts by weight. This is because if the amount is less than the above range, the effect of improving the sliding properties is insufficient, and if the amount exceeds the above range, the mechanical properties of the polyamide resin are significantly deteriorated, which is not preferable. From such a tendency, a more preferable range is 1.0 to 15.0 parts by weight.

In the present invention, the mixing ratio of the organopolysiloxane having a unit containing an amino group, a carboxyl group, an alcoholic hydroxyl group or a mercapto group to 100 parts by weight of the aliphatic polyamide resin is 0.5.
~ 20.0 parts by weight.

The reason is that if the amount is less than the above range, the reaction for forming a three-dimensional network structure with the organopolysiloxane having a unit containing an epoxy group is not sufficient, so that the organopolysiloxane does not fall out from the inside of the polyamide resin. Because you can't. That is, when the amount is less than the above range, the polyamide resin composition used in the present invention has a defect that the rate of oil exudation becomes excessive when heated, as in the case of ordinary oil-containing plastics.

On the contrary, if the amount exceeds the above range, the mechanical properties of the aliphatic polyamide resin are remarkably deteriorated, which is not preferable. From such a tendency, a more preferable range is 1.0 to 15.0 parts by weight.

In the range of the compounding ratio of the organopolysiloxane having a unit containing an amino group, a carboxyl group, an alcoholic hydroxyl group or a mercapto group, 2
A combination of more than one type of organopolysiloxane may be used.

The polyamide resin composition, which is the molding material for the liner used in the present invention, contains, in addition to the above-mentioned lubricating compounding agent, that is, modified organopolysiloxane, an additive which can be generally compounded in synthetic resins widely. It is also possible to use them together in an amount such that the properties of the product are not deteriorated. Examples of such additives include mold release agents, flame retardants, weather resistance improvers, pigments and dyes.

Further, it is of course possible to use well-known lubricants in combination with the above-mentioned additives, such as tetrafluoroethylene resin powder, graphite, fluorinated graphite, talc, boron nitride,
Other industrial lubricants can be appropriately selected and used according to the purpose of use.

Further, well-known fibrous substances such as glass fiber, carbon fiber, alumina fiber, rock wool, wollastonite, potassium titanate whisker, etc.
Alternatively, an inorganic filler represented by glass powder, talc, clay, calcium carbonate or the like can be used. In any case, it is needless to say that the intermediate product or the final product form can be modified to improve the properties by chemical or physical treatment as long as the lubricity of the composition of the present invention is not impaired.

For mixing the polyamide resin composition used in the present invention, a conventionally well-known method can be used. For example, the polyamide resin and the above-mentioned components are dissolved individually or appropriately in a solvent (for example, fluorochlorohydrocarbon) and mixed with a mixer such as a Henschel mixer, a ball mill or a tumbler mixer, and then the solvent is removed. Supply to the melt extruder,
Alternatively, it may be previously melt-mixed using a heat roller, a kneader, a Banbury mixer, or the like.

Further, an organopolysiloxane having a unit containing an epoxy group and an organopolysiloxane having a unit containing at least one group selected from an amino group, a carboxyl group, an alcoholic hydroxyl group and a mercapto group are separately prepared. A method may be employed in which pellets mixed with a polyamide resin are prepared, two types of pellets are mixed at a predetermined ratio immediately before molding, and the mixture is supplied to an extruder.

[0032]

The liner used for the conduit according to the present invention is mainly composed of a functional group of an organopolysiloxane containing an epoxy group and a functional group of an organopolysiloxane containing an amino group, a carboxyl group, an alcoholic hydroxyl group or a mercapto group. It consists of an aliphatic polyamide resin as a component in which a three-dimensional network structure of a lubricating organopolysiloxane is formed, and such a network exists in a finely dispersed state.

Therefore, since the liner has a small friction coefficient and the organopolysiloxane exhibiting lubricity does not fall off from the aliphatic polyamide resin as the base material, the liner is used for a long time regardless of the room temperature or the heated state. In this case, the coefficient of friction is stable. In addition, the network structure of the organopolysiloxane reinforces the base material, and it is possible to prevent a decrease in mechanical strength due to the addition of silicone.

When 12-nylon is adopted as the aliphatic polyamide resin, it is a more preferable liner because the dimensional change and physical property change due to water absorption are small.

Furthermore, when an amino group- or carboxyl group-containing organopolysiloxane is adopted, these groups have better reactivity with epoxy groups than hydroxyl groups and mercapto groups, and there are few unreacted groups in the molded article. Since it exhibits stable performance over a long period of time, it becomes a more preferable liner.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of an embodiment will be described below with reference to the accompanying drawings. As shown in FIGS. 1 and 2, the cord conduit of the embodiment includes a flexible metal conduit 1, a tubular flexible liner 2 mounted inside the conduit 1, and an inner side of the liner 2. And a flexible inner cable 3 which is inserted through.

The inner cable 3 is formed by twisting a plurality of steel element wires together, and a lubricant such as grease is applied to the outer peripheral surface thereof. The conduit 1 is formed into a tubular shape by closely winding spirally wound steel wires 1a having a square cross section,
A synthetic resin jacket 1b is provided on the outer circumference.

As the synthetic resin forming the outer cover 1b, high density polyethylene, polyvinyl chloride, polypropylene,
Examples thereof include fluororesins. A tube-shaped liner 2 which is separately formed is inserted into the inner peripheral surface of the conduit 1.

As another form of the above-mentioned cable conduit, one shown in FIGS. 3 and 4 will be described. This has a coating 5 made of synthetic resin on the surface of the inner cable 4. As a material for forming the coating 5, a synthetic resin for molding which has a low coefficient of friction with the polyamide resin composition forming the liner 2 and is difficult to be fused and which has appropriate flexibility can be adopted.

To form the conduit 6 of this product, a plurality of round steel wires 7 (or a synthetic resin cord may be used) are wrapped around the liner 2 at a loose pitch, and the surface and the circle are wound. The gap between the steel wires 7 was coated with a synthetic resin, and an outer cover 8 made of the same synthetic resin was extrusion-molded.

Raw materials for forming the liners of Examples and Comparative Examples are collectively shown below. The abbreviations are shown in [].

(1) 12 nylon (manufactured by Daicel Chemical Industries:
DAIAMID L1640P) [PA12] (2) 66 nylon (manufactured by Toray Industries: Amilan CM3001)
N) [PA66] (3) 46 nylon (manufactured by Japan Synthetic Rubber Co., Ltd .: TW-30)
0) [PA46] (4) Polyacetal (manufactured by Polyplastics: Duracon M25) [POM] (5) Polyethylene (manufactured by Mitsui Petrochemical Co .: Lübmer)
L4000) [PE] (6) Epoxy group-containing organopolysiloxane (manufactured by Shin-Etsu Chemical Co., Ltd .: epoxy-modified silicone oil KF10)
2) [Epoxy-modified silicone] (7) Organopolysiloxane containing amino group: Formula II
What is represented by I (Shin-Etsu Chemical Co., Ltd .: Amino-modified silicone oil KF861) [Amino-modified silicone] (8) Carboxyl group-containing organopolysiloxane: What is represented by the formula V (Shin-Etsu Chemical Co., Ltd .: Carboxyl-modified silicone) Oil X-22-3701E)
[Carboxyl-modified silicone] (9) Organopolysiloxane containing alcoholic hydroxyl group: represented by the above formula VI (manufactured by Shin-Etsu Chemical Co., Ltd .:
Silicone oil X-22-160C) [Hydroxyl group-containing silicone] (10) Mercapto group-containing organopolysiloxane: represented by the above formula VII (Shin-Etsu Chemical Co., Ltd .: mercapto modified silicone oil X-22-980) [mercapto modified Silicone] (11) Nonfunctional organopolysiloxane: represented by the following formula 3 (Shin-Etsu Chemical Co., Ltd .: Silicone oil KF96-5000) [nonfunctional silicone]

[0043]

[Chemical 3]

[Examples 1 to 10] As shown in FIGS. 1 and 2, a steel wire 1a made of a flat steel sheet having a thickness of 1.3 mm and a width of 2.4 mm was densely wound in a spiral shape. A jacket 1b made of polypropylene was formed thereon by extrusion molding, and a tubular liner 2 formed by extruding a polyamide resin composition having the composition shown in Table 1 under the following molding conditions was inserted therein. The tubular liner 2 had an outer diameter of 5.7 ± 0.1 mm, an inner diameter of 3.8 ± 0.1 mm, and a length of 700 mm.

In the liner, 19 steel wires having a diameter of 0.6 mm are twisted together to have a diameter of 3 mm and a length of 1
A 000 mm inner cable 3 was inserted to obtain a cable conduit product.

The molding conditions of the above polyamide resin composition are as follows. The raw materials were mixed with a Henschel mixer in the mixing ratio shown in Table 1, supplied to a twin-screw melt extruder, extruded under the melt-mixing conditions shown in Table 2, granulated, and pellets were obtained. The obtained pellets were used in an extruder having a crosshead die having a screw outer diameter of 40 mm and a screw pressure ratio of 3 to be set at 230 to 30.
Extrusion molding under the temperature condition of 0 ℃, 1m / min by take-off machine
And the liner was molded at the speed of.

Using the load efficiency measuring tester as shown in FIG. 5, the cable conduit manufactured as described above is loaded with efficiency (%).
Was measured. The test conditions are as follows, and the results are shown in Table 3.
It was shown to.

[Load efficiency measurement test conditions] JASO F9
In accordance with the operation efficiency test shown in 03-75, the cable conduit A is fixed at a length of 1000 mm, a fixed distance L = 400 mm, and a bending angle of 180 degrees, and a spring load B (pulling) is applied to one end of the inner cable. Load, kgw) was applied, and the other end was reciprocally slid at a stroke of 30 mm and a speed of 30 cycles / minute. Then, the spring fixed side load B and the tension side load C were measured, and the load efficiency at that time = (B / C) × 100 was obtained.
The temperature of the test atmosphere was 120 ° C.

Further, the pellets obtained in the above-mentioned manufacturing stage were supplied to an injection molding machine, and the inner diameter of the pellets was adjusted under the molding conditions shown in Table 2.
A ring-shaped test piece having a diameter of 23 mm, an outer diameter of 23 mm, and a length of 13 mm was formed.

Using this ring-shaped test piece, the following friction and wear test was conducted, and the results are shown in Table 4.

[Friction and abrasion test conditions] The friction test was carried out using a thrust type friction tester with a sliding speed of 10 m / min and a load of 10 k.
The friction coefficient was measured 10 minutes after the start of operation and 60 minutes after the start of operation under the condition of g / cm ² .

The abrasion test was carried out using a thrust type abrasion tester under the conditions of a sliding speed of 32 m / min and a load of 3.1 kg / cm ² . In all the tests, bearing steel SUJ2 (quenched and ground) was used as the sliding mating material.

[0053]

[Table 1]

[0054]

[Table 2]

[0055]

[Table 3]

[0056]

[Table 4]

[Comparative Examples 1 to 11] Liners having the same shape and dimensions as those of Examples 1 to 10 and ring-shaped test pieces were prepared under the compounding composition, mixed composition, mixing conditions and molding conditions shown in Tables 5 and 6. Then, a cord conduit was formed in the same manner as in the example. The cord conduit and ring-shaped test piece using this liner are
Under the same test conditions as in Examples 1 to 10, load efficiency (%), friction coefficient, wear coefficient (× 10 ⁻¹⁰ cm ³ / kg)
-M) was measured, and the results are summarized in Tables 7 and 8.

[0058]

[Table 5]

[0059]

[Table 6]

[0060]

[Table 7]

[0061]

[Table 8]

As is clear from the results of Tables 3, 4, 7, and 8, the results of Comparative Examples 1 to 11 were such that the prescribed modified organopolysiloxane was not blended in combination or the blending ratio was outside the prescribed range. The cable conduit was unable to maintain the load efficiency at the beginning of the test at high temperature during the long test time, or was inferior to the beginning of the test. Further, the sliding test results of the ring-shaped test piece showing the physical properties of the liner alone also showed that abrasion powder was generated and the friction coefficient was not stable.

On the other hand, in Examples 1 to 10 satisfying all the conditions, the flexibility of the cable conduit during the test was good, the load efficiency was high and the operability was stable, and No abrasion powder was generated, both the friction coefficient at high temperature (test temperature 120 ° C.) and the abrasion coefficient were small, and the moldability was excellent.

[0064]

As described above, according to the present invention, since the liner of the cable conduit is formed of the polyamide resin composition having a predetermined composition, the tertiary polyamide of the lubricating organopolysiloxane is contained in the main component polyamide resin constituting the liner. The original mesh structure is formed, and the mesh is finely dispersed and does not fall out of the polyamide resin, so the flexibility of the conduit is not impaired, the sliding resistance is low even under high temperature use conditions, and stable operation for a long time is achieved. It has the advantage of being a good conduit.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of an embodiment.

2 is a cross-sectional view of the conduit and liner of FIG.

FIG. 3 is a partially cutaway perspective view showing another embodiment of the embodiment.

FIG. 4 is a sectional view of FIG.

FIG. 5 is a schematic explanatory view of a load efficiency measurement test device.

[Explanation of symbols]

 A cable conduit 1,6 conduit 1a steel element wire 1b, 8 jacket 2 liner 3,4 inner cable 5 coating 7 round steel wire

Claims (2)

[Claims] 1. A cable conduit comprising a flexible conduit, a tubular flexible liner mounted inside the conduit, and a flexible inner cable inserted inside the liner, A cable conduit, wherein the liner is formed of a polyamide resin composition having the following composition. 0.5 to 100 parts by weight of the aliphatic polyamide resin and 0.5 to 100 parts of the organopolysiloxane having a unit containing an epoxy group.
A polyamide resin composition comprising 20.0 parts by weight and 0.5 to 20.0 parts by weight of an organopolysiloxane having a unit containing an amino group, a carboxyl group, an alcoholic hydroxyl group or a mercapto group. 2. A cord conduit comprising a flexible conduit, a tubular flexible liner mounted inside the conduit, and a flexible inner liner inserted inside the liner, A cable conduit, wherein the liner is formed of a polyamide resin composition having the following composition. The organopolysiloxane having a unit containing an epoxy group is added to 100 parts by weight of 12-nylon 0.5 to 20.
A polyamide resin composition containing 0 part by weight and 0.5 to 20.0 parts by weight of an organopolysiloxane having a unit containing an amino group or a carboxyl group.