JPH01271493A - Control cable using diurea lubricant - Google Patents

Abstract

PURPOSE:To form a control cable packed with a lubricant capable of enduring high temps. for a prolonged period of time by combining a particular base oil with a particular thickening agent and a particular solid lubricant. CONSTITUTION:A control cable is provided, which is formed by effecting packing or coating of a lubricant [L] having the following compsn. between an inside cable and a conductor or a liner. [L]: compsn. comprising 100 pts.wt. dialkylpolysiloxane oil as a base oil, 3-30 pts.wt. diurea compd. (thickening agent) and 5-30 pts.wt. lithium stearate and/or barium stearate as a solid lubricant. It is pref. that 0-10 pts.wt., based on 100 pts.wt. siloxane oil, at least one member selected from boron nitride and carbon fluoride be further added to the above-mentioned lubricant, since initial load efficiency can be improved. Pref. diurea compds. include a compd. of the formula I (wherein R1 is a divalent arom. hydrocarbon residue, and R2 and R3 may be identical or different and each thereof is an alkyl group or a phenyl group).

Description

[Detailed description of the invention] [Industrial application field] TECHNICAL FIELD The present invention relates to lubricant filling control cables.

[Prior Art] A control cable basically consists of a flexible conduit and a flexible inner cable inserted into the conduit. pull operation,
The driven equipment attached to the other end of the inner cable can be remotely controlled by applying a rotational operation or a combination of these operations.

The inner cable is usually made of one metal wire or several metal wires twisted together, or one with a synthetic resin coating on the outer periphery or one with a flat steel wire wrapped around it to form an armor layer. has been done.

In addition, the conduit is made of, for example, a helical tube in which one or more flat steel wires or round steel wires are tightly wound into a coil, and a protective layer made of synthetic resin provided on the outside of the helical tube. is used.

However, if the conduit and the inner cable come into direct contact, the sliding resistance increases, so a liner made of a flexible tube made of synthetic resin is provided around the inner circumference of the conduit. Resins such as polyethylene, polyoxymethylene, polybutylene terephthalate, and polytetrafluoroethylene are used as materials for the liner.

Furthermore, in order to reduce the sliding resistance between the liner and the inner cable, a lubricant is filled between the liner and the inner cable. Since this lubricant has a large impact on control cables, the optimal composition for control cables has been intensively studied.

The lubricants currently used for control cables are usually based on silicone oil, olefin-based, polyglycol-based synthetic oils, or mineral oils, and are blended with thickeners. Metal soaps, such as calcium soap, lithium soap, and aluminum soap, are used as thickeners, and lithium soap in particular has properties such as durability, heat resistance, water resistance, load efficiency, and stick prevention properties. From this point of view, it is preferably used.

In addition, various additives such as antioxidants and rust preventives may be added to these lubricants.

[Problems to be solved by the invention] In recent years, mechanical technology has progressed rapidly, and control cables that can withstand harsh operating environments are now required, and conventional lubricants cannot meet these demands. It's disappearing.

An object of the present invention is to provide a lubricant-filled control cable that can withstand high temperatures for long periods of time.

[Means for Solving the Problems] The present invention, which has achieved the above object, uses dialkyl polysiloxane oil as a base oil, and contains 3 to 30 parts of a diurea compound per 100 parts (fffffi parts, hereinafter the same) of the base oil, A composition containing 5 to 30 parts of lithium stearate and/or barium stearate and 0 to 10 parts of at least one of boron nitride or carbon fluoride is used as a lubricant, and the lubricant is used as a lubricant for the inner rope, the conduit, or the liner. It relates to a control cable that is filled or coated between.

[Operations and Examples] The lubricant filled in the control cable of the present invention is
It is an optimal combination of base oil, thickener, and solid lubricant for control cables, and this combination itself is new.

The base oil used in the present invention is limited to dialkylpolysiloxane oils such as dimethylpolysiloxane oil and alkyl-modified polysiloxane oil; other silicone oils such as methylphenylpolysiloxane oil and diphenylpolysiloxane oil may not provide the desired durability. do not have. The viscosity of dimethylpolysiloxane oil (25℃) is 5 to 50.000C
8tO can be used, but especially 100 to 15.0
00 cSt is preferred. The degree of polymerization that provides such a viscosity is usually 10-2000, preferably 80-2000.
800 range is adopted.

In addition, diurea compounds used as thickeners include:
For example, monoamines and aromatic diisocyanates have the general formula: (wherein R+ is a divalent aromatic hydrocarbon residue, R? and R3 are the same or different and are each an alkyl group or a phenyl group). Examples include the diurea compounds shown below. Examples of amines include cyclohexylamine, octylamine, stearylamine, aniline,
Examples of aromatic diisocyanates include tolylene diisocyanate, 4.4°
-Diphenylmethane diisocyanate and the like. Particularly preferred combinations are octylamine and 4,4'-diphenylmethane diisocyanate, and stearylamine and 4,4'-diphenylmethane diisocyanate.

The diurea compound is preferably one obtained by reacting a monoamine and a diisocyanate in a base oil.

The third components, lithium stearate and barium stearate, are known as solid lubricants, and in the present invention, lithium stearate and barium stearate are added alone or both are added. This third component imparts slipperiness to the lubricant in medium and high load regions, and has the effect of particularly improving the load efficiency of the control cable. With solid lubricants other than these, the degree of improvement cannot be said to be sufficient.

In the present invention, the initial load efficiency can be improved by further adding boron nitride or carbon fluoride.

Additionally, additives that are usually added to lubricants, such as antioxidants, extreme pressure agents, rust preventives, metal deactivators, etc., may be added.

The lubricant used in the present invention includes 100 parts of dialkyl polysiloxane oil, 3 to 30 parts, preferably 5 to 15 parts, of a diurea compound, and 5 to 30 parts of lithium stearate and/or barium stearate as the third component. , preferably 7 to 20 parts. Further, when boron nitride or carbon fluoride is added, it may be added up to 10 parts, preferably 0.5 to 5 parts, to the lubricant.

A method used for lubricant compositions is employed for mixing and preparing these components. A particularly preferred preparation method is to heat-react a mixture of base oil and diisocyanate with a monoamine to prepare a mixture of base oil and diurea compound, and add the third component, a solid lubricant, in the form of a powder. This is a method of uniformly mixing.

The lubricant can be applied to the control cable by pumping it into the liner or conduit, or by brushing the lubricant onto the inner cable surface. In the present invention, the lubricant may be filled between the liner and the inner cable, or if there is no liner, the lubricant may be filled between the conduit and the inner cable.

In the control cable of the present invention, the lubricant is stable even at high temperatures due to the combination of diurea compounds, has low oil separation property, has excellent overall stability at high temperatures, and has a specific solid lubricant combination. This improves the sliding properties and friction and wear resistance of the sliding surface between the inner cable and the conduit or liner, allowing it to withstand use in harsh environments.

Next, the control cable of the present invention will be explained based on combination examples and examples, but the present invention is not limited to these examples. In addition, parts in the formulation examples and examples are parts by weight.

Formulation example 1 Octylamine 1.8 parts Stearylamine 3.7 parts Dimethylpolysiloxane oil 10
0 parts and 3.5 parts of MDI were placed in a reaction vessel and heated to 80°C. The total amount of octylamine and stearylamine, which were separately dissolved, was added to this and allowed to react. The reaction was heated to about 150° C., then cooled to about 80° C., and rolled to form a mixture of base oil and thickener (diurea compound).

Formulation Example 2 Viscosity (25°C) of dimethylpolysiloxane oil: 15.
A mixture of base oil and thickener (diurea compound) was prepared in the same manner as in Formulation Example 1 except that 000cst was used.

Formulation Example 3 Octylamine 0.59 parts Stearylamine 1.24 parts A mixture of base oil and thickener (diurea compound) was prepared in the same manner as in Formulation Example 1.

Formulation example 4 Octylamine 5.91 parts Stearylamine 12.44 parts 4.4°-diphenylmethane diisocyanate (MDI) 1□665 parts Formulation example 1
A mixture of base oil and thickener (diurea compound) was prepared in the same manner as above.

Formulation Example 5 Dimethylpolysiloxane oil (25°C, 100 cSt) 1001x octylamine 1.8 parts Stearylamine 3.7 parts 4.4°-Diphenylmethane diisocyanate (MDI) 3.5 parts Same as Formulation Example 1 A mixture of base oil and thickener (diurea compound) was prepared.

Comparative formulation example 1 Dimethylpolysiloxane oil (25°C, 1000 cSt) 10 parts Lithium soap 12 parts Lithium soap 12
and 90 parts of petroleum ether into a pump and heated to 122°C (2
50) and 2001b/in2 for 30 minutes. Thereafter, 100 parts of dimethylpolysiloxane oil was added and heated and stirred for about 20 minutes under the above conditions. Thereafter, the pump was cooled and returned to normal pressure, and the contents were taken out and rolled to prepare a mixture of base oil and thickener (lithium soap).

Comparative formulation example 2 Polyglycol synthetic oil (25°C, 100cst) 10
0 parts lithium soap 12 parts 12 parts lithium soap and 70 parts polyglycol synthetic oil were placed in a container and heated to 220°C to dissolve.

After that, 30 parts of polyglycol synthetic oil was gradually added,
The contents were gradually cooled to 170°C. Then rapidly cool,
The contents are taken out and rolled to remove the base oil and thickener (
(lithium soap) was prepared.

Comparative Formulation Example 3 A mixture of base oil and thickener (diurea compound) was prepared in the same manner as Formulation Example 1 except that methylphenylpolysiloxane oil (25°C, 550 cSt) was used instead of dimethylpolysiloxane oil as the base oil. was prepared.

Comparative formulation example 4 Dimethylpolysiloxane oil (25°C, 500°C) was used as the base oil.
A mixture of a base oil and a thickener (lithium soap) was prepared in the same manner as in Comparative Formulation Example 1, except that cSt) was used.

Comparative Formulation Example 5 Base oil and thickener (lithium soap) were prepared in the same manner as Comparative Formulation Example 1 except that methylphenylpolysiloxane oil (25°C, 550 cSt) was used instead of dimethylpolysiloxane oil as the base oil. A mixture of

Comparative Formulation Example 6 Base oil and thickener (lithium soap) were prepared in the same manner as in Comparative Formulation Example 2, except that olefin synthetic oil (25°C, 50 cSt) was used instead of polyglycol synthetic oil as the base oil. A mixture of

Example 1 10% of lithium stearate was added to the mixture obtained in Formulation Example 1.
A lubricant having a worked penetration of 325 and a dropping point of 200° C. or higher was prepared by adding 50% of the lubricant and rolling it.

The obtained lubricant was wrapped around one oil-tempered wire, 15 galvanized steel wires in an S-shaped direction, and 16 galvanized steel wires wrapped in a 2-shaped direction, and swaged to create an inner cable (outside diameter 3.2
11), a polybutylene terephthalate liner (inner diameter 3.8 mm), and one square cross-section (thickness 1.8 mm).
An armor layer is formed by closely winding steel strips (30mm, width 2.40mm) into a tubular shape (outer diameter 8.8m, inner diameter 6.DOmm) and a thickness of 0.7mm around its outer periphery. A control cable consisting of a conduit (outside diameter 10 m11) made of a synthetic resin (polypropylene protective layer) coated with was filled with the lubricant by applying it to the inner cable.

The load efficiency of the control cable thus produced in various environments was measured using the method described above.

The results are shown in Table 1.

(Measurement method) As shown in Figure 1, the outer casing (1) is
The inner cable (2) is bent and fixed at a length of 150 m5, one end of the inner cable (2) is fixed to the spring (3), and the other end is pulled at a speed of 50 strokes/min, a stroke length of 301 cm, and a maximum load of 50 kgf.

(Measurement conditions) For initial performance (after 10 strokes), load efficiency was measured at -40℃, room temperature, and 120℃, and for durability, after 2 million strokes under constant temperature conditions of 120℃, load efficiency was measured at room temperature. It was measured with

Examples 2 to 14 and Comparative Examples 1 to 11 Control cables were manufactured in the same manner as in Example 1, except that a lubricant having the composition shown in Table 1 was used, and the load efficiency was measured in the same manner as in Example 1. did. The results are shown in Table 1.

In addition, the following lubricants were used in Examples 2 to 14 and Comparative Examples 1 to 11, respectively.

Example 2 Lithium stearate 10 was added to the mixture obtained in Formulation Example 1.
A lubricant having a worked penetration of 323 and a perfect score of 200° C. or higher was prepared by adding 2 parts of boron nitride and 2 parts of boron nitride.

Example 3 1 barium stearate was added to the mixture obtained in Formulation Example 1.
A lubricant having a worked penetration of 320 and a perfect score of 200° C. or higher was prepared by adding 0 parts of boron nitride and 2 parts of boron nitride.

Example 4 7 parts of lithium stearate and 2 parts of carbon fluoride were added to the mixture obtained in Formulation Example 1, and the mixture was rolled to prepare a lubricant having a worked penetration of 323 and a dropping point of 200° C. or higher.

Example 5 7 parts of lithium stearate and 4 parts of carbon fluoride were added to the mixture obtained in Formulation Example 1, and the mixture was rolled to prepare a lubricant having a worked penetration of 317 and a dropping point of 200° C. or higher.

Comparative Example 1 The mixture obtained in Formulation Example 1 (worked penetration 328, full score 200°C or higher) was used as a lubricant as it was.

Comparative Example 2 10 parts of lithium stearate was added to the mixture obtained in Comparative Formulation Example 4, and the mixture was rolled to have a worked penetration of 31B.
A lubricant with a dropping point of 199 was prepared.

Comparative Example 3 10 parts of boron nitride was added to the mixture obtained in Comparative Formulation Example 1, and the mixture was rolled to give a worked penetration of 318 and a perfect score of 1.
A 99°C lubricant was prepared.

Examples 6 to 14 and Comparative Examples 4 to 11 Using a lubricant having the composition shown in Table 1, one strand was made by twisting seven steel cables in the inner cable, and the seven strands were twisted together. A 7×7 structure (outer diameter 3.0 gv) was used.

A control cable made of polyoxymethylene liner (inner diameter 3.8 m5) and the conduit of Example 1 (outer diameter 10 mm) was prepared, and 1.5 g of lubricant was added per inner cable Im.
Coated. The load efficiency was measured in the same manner as in Example 1 (however, the durability test was conducted at 130°C). The results are shown in Table 1.

The lubricants used in Examples 6 to 14 and Comparative Examples 4 to 11 were as follows.

Example 6 Lithium stearate 10 was added to the mixture obtained in Formulation Example 3.
A lubricant having a worked penetration of 397 and a dropping point of 200° C. or higher was prepared by adding 50% of the lubricant and rolling it.

Example 7 Lithium stearate 10 was added to the mixture obtained in Formulation Example 4.
A lubricant having a worked penetration of 219 and a perfect score of 200° C. or higher was prepared by adding 50% of the lubricant and rolling it.

Example 8 5 parts of lithium stearate was added to the mixture obtained in Formulation Example 1, and the mixture was rolled to give a worked penetration of 329 and a dropping point of 2.
A lubricant with a temperature of 00°C or higher was prepared.

Example 9 30% of lithium stearate was added to the mixture obtained in Formulation Example 1.
A lubricant having a worked penetration of 301 and a dropping point of 200° C. or higher was prepared by adding 50% of the lubricant and rolling it.

Example 1O Lithium stearate 10 was added to the mixture obtained in Formulation Example 5.
A lubricant having a worked penetration of 32B and a dropping point of 200° C. or higher was prepared by adding 50% of the lubricant and rolling it.

Example 11 1 1 of lithium stearate was added to the mixture obtained in Formulation Example 1.
A lubricant having a worked penetration of 325 and a perfect score of 200° C. or higher was prepared by adding 0 part of the lubricant and rolling it.

Example 12 One part of lithium stearate was added to the mixture obtained in Formulation Example 1.
A lubricant having a worked penetration of 321 and a perfect score of 200° C. or higher was prepared by adding 0 parts of boron nitride and 2 parts of boron nitride.

Example I3 Lithium stearate 1 was added to the mixture obtained in Formulation Example 2.
A lubricant having a worked penetration of 318 and a dropping point of 200°C or higher was prepared by adding 0 part of the lubricant and rolling it.

Example 14 Lithium stearate 2 was added to the mixture obtained in Formulation Example 1.
A lubricant having a worked penetration of 3201 and a dropping point of 200° C. or higher was prepared by adding 0 parts of boron nitride and 2 parts of boron nitride.

Comparative Examples 4.5 and 6 are Comparative Examples 1.2 and 3, respectively.
It is the same lubricant. The following lubricants were used in Comparative Examples 7 to 11, respectively.

Comparative Example 7 The mixture obtained in Comparative Formulation Example 2 (worked penetration 325,
(full score: 190°C) was used as it was as a lubricant.

Comparative Example 8 10 parts of lithium stearate was added to the mixture obtained in Comparative Formulation Example 3, and the mixture was rolled to give a worked penetration of 319.
A lubricant with a perfect score of 200°C or higher was prepared.

Comparative Example 9 The mixture obtained in Comparative Formulation Example 4 (worked penetration 320,
(dropping point: 195°C) was used as a lubricant as it was.

Comparative Example 10 The mixture obtained in Comparative Formulation Example 5 (worked penetration 320,
(dropping point: 193°C) was used as a lubricant as it was.

Comparative Example 11 The mixture obtained in Comparative Formulation Example 6 (worked penetration 322,
(dropping point: 191°C) was used as a lubricant as it was.

[Margins below] [Effects of the Invention] According to the present invention, by providing a lubricant that has excellent durability over a wide temperature range, particularly at high temperatures, the durable life of the control cable can be further extended.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of a device used to measure the load efficiency of a control cable in an example. Patent applicant: Nippon Cable System Co., Ltd.
1 person

Claims (1)

[Scope of Claims] 1 A dialkyl polysiloxane oil is used as a base oil, and the base oil 1
A composition consisting of 3 to 30 parts by weight of a diurea compound and 5 to 30 parts by weight of lithium stearate and/or barium stearate as a solid lubricant is used as a lubricant, and the lubricant is and a control cable that is filled or coated between the conduit or liner. 2. The lubricant contains at least one of boron nitride or carbon fluoride based on 100 parts by weight of the siloxane oil.
The control cable according to claim 1, containing 10 parts by weight. 3. The control cable according to claim 1, wherein the dialkylpolysiloxane oil is dimethylpolysiloxane oil. 4 Diurea compounds have a general formula: ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ (In the formula, R_1 is a divalent aromatic hydrocarbon residue, R_2 and R_3 are the same or different, and are each an alkyl group or a phenyl group ) The control cable according to claim 1, which is a diurea compound represented by: 5. The control cable according to claim 1, wherein the diurea compound is a reaction mixture mainly consisting of a diurea compound obtained by reacting a monoalkylamine with an aromatic diisocyanate. 6 Diurea compound with monoalkylamine and 4,4'-
The control cable according to claim 1, which is a reaction mixture mainly comprising a diurea compound obtained by reaction with diphenylmethane diisocyanate. 7 Dimethylpolysiloxane oil is used as the base oil, and the base oil 10
0 parts by weight, 3 to 30 parts by weight of a reaction mixture mainly containing a diurea compound obtained by the reaction of a monoalkylamine and an aromatic diisocyanate, 5 to 30 parts by weight of lithium stearate and/or barium stearate, and Claim 1, wherein a composition containing 0 to 10 parts by weight of at least one of boron oxide or carbon fluoride is used as a lubricant, and the lubricant is filled or applied between the inner cable and the conduit or liner. control cable.