JP3097856B2 - Control cable - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a control cable. More specifically, the present invention relates to a control cable having remarkably improved durability and load efficiency under high temperature and high load.

[Prior Art] Conventionally, in order to improve load efficiency, a synthetic resin layer (hereinafter, referred to as a coat inner) is formed on an outer periphery of an inner cable of a control cable, or a synthetic resin layer tube (hereinafter, referred to as a liner) is provided in a conduit. ) Is being inserted.

[Problems to be Solved by the Invention] In recent years, with use of high-performance and compact machines using a control cable, operating conditions such as an increase in environmental temperature and an increase in load have become severe. For example, control cables used in automobile engine rooms at high temperatures of 150 ° C. or higher are increasing.

However, the usable temperature of the synthetic resin used for the coating of the inner cable and the liner is as follows: polyacetal resin (hereinafter, referred to as POM) is 120 ° C or lower, and polybutylene terephthalate resin (hereinafter, referred to as PBT) is 140 ° C or lower. Yes, 150
Under a high temperature environment of not less than ° C., some fluorine resins such as polytetrafluoroethylene (hereinafter, referred to as PTFE) and tetrafluoroethylene / perfluoroalkyl ether copolymer (hereinafter, referred to as PFA) have been used. But,
Fluororesins have good slidability, but are inferior in abrasion resistance under high loads, and their use range has been limited to applications with relatively low loads.

A group of thermoplastic resins generally called spar engineering plastics are excellent in heat resistance, but lack flexibility and are expensive, so they are difficult to apply to this field. Among super engineering plastics, polyphenylene sulfide resin (hereinafter referred to as PPS) is relatively inexpensive and has excellent slidability. However, it does not have the flexibility required for routing control cables and becomes brittle with time at high temperatures. It cannot be used as a main material, and is only used as an additive to slightly improve the abrasion resistance of a PTFE liner.

In view of such circumstances, an object of the present invention is to provide a control cable having high load efficiency and durability even under severe conditions of high temperature and high load.

[Means for Solving the Problems] The control cable of the present invention comprises an inner cable and a conduit for slidably guiding the inner cable, and an elastomer is compounded with polyphenylene sulfide resin on the outer periphery of the inner cable. The elastomer is a block copolymer comprising an α-olefin and a glycidyl ester of an α, β-unsaturated acid, or a block copolymer comprising a vinyl aromatic compound polymer and an olefin compound polymer. A modified block copolymer obtained by bonding a molecular unit containing a carboxylic acid group or a derivative thereof to a polymer is an essential component. The elastomer is 5 to 40 wt.
%.

Further, the composition has a flexural modulus of 10,000 to 30,000 kg / c.
m ² and a tensile elongation at break of 5% or more.

A control cable using the inner cable and having a liner interposed between the inner cable and the conduit, wherein the liner is preferably made of a heat-resistant synthetic resin.

In this case, the heat-resistant synthetic resin is JIS K7121
The melting point is determined by the plastic transition temperature measurement method in
PTFE, PFA, PEE with a tensile elongation at break of 10% or more after 600 hours in a dry heat state of 200 ° C or more and 150 ° C or more
K, a high polymerization degree nylon 66 to which a heat stabilizer is added, and a composition obtained by blending an elastomer with the PPS of the present invention are used.

PPS used in the present invention is a structural formula At least 70 mol%, more preferably
It is a high polymer containing at least 90 mol%, and the repeating unit is 70
If it is less than mol%, heat resistance is impaired, which is not preferable.

PPS is generally a polymer having a relatively small molecular weight obtained by the production method represented by Japanese Patent Publication No. 45-3368 and an essentially linear polymer obtained by the production method represented by Japanese Patent Publication No. 52-12240. There are relatively high molecular weight polymers,
In the polymer obtained by the method described in JP-B No. 45-3368, the degree of polymerization can be increased by heating in an oxygen atmosphere after polymerization or by adding a crosslinking agent such as a peroxide and heating. It is also possible to use it in a modified form.

In the present invention, it is possible to use PPS obtained by any method, but an essentially linear polymer having a relatively high molecular weight is more preferably used.

In addition, PPS can constitute less than 30 mol% of the repeating unit with a repeating unit having the following structural formula.

It is desirable that the PPS used in the present invention be produced through the above-mentioned polymerization step, and then be subjected to acid treatment, heat treatment, or washing with an organic solvent.

The epoxy group-containing olefin polymer used in the present invention is an olefin polymer having an epoxy group in a side chain or a main chain, and does not include a general epoxy resin.

Examples of the α-olefin in the copolymer comprising an α-olefin and a glycidyl ester of an α, β-unsaturated acid include ethylene, propylene, and butene-1.
Glycidyl esters of α, β-unsaturated acids are represented by the general formula (R represents a hydrogen atom or a lower alkyl group), and specific examples include glycidyl acrylate, glycidyl methacrylate and glycidyl ethacrylate.

The content of epoxy group in the copolymer of α-olefin and glycidyl ester of α, β-unsaturated acid is usually 0.1.
1 to 30 wt%, particularly preferably 0.2 to 20 wt%, and 0.1 wt%
If it is less than 30% by weight, the intended effect cannot be sufficiently obtained, and if it exceeds 30% by weight, gelation occurs at the time of melt-kneading with PPS, and the extrusion stability, moldability and mechanical properties are undesirably reduced.

Copolymers of α-olefins and glycidyl esters of α, β-unsaturated acids include other olefinic monomers, such as methyl acrylate, methyl methacrylate, acrylonitrile, styrene, as long as the effects of the present invention are not impaired. , Vinyl acetate and vinyl ether may be copolymerized.

The modified block copolymer used in the present invention is a modified block obtained by bonding a molecular unit containing a carboxylic acid group or a derivative thereof to a block copolymer composed of a vinyl aromatic compound polymer and an olefin compound polymer. It is a copolymer.

Examples of the vinyl aromatic compound constituting the modified block copolymer include styrene, α-methylstyrene, vinyltoluene and the like, and styrene is particularly preferred. As the olefin compound polymer constituting the modified block copolymer, monoolefins such as ethylene, propylene, butene-1, and isobutylene, butadiene, isoprene,
Conjugated diolefins such as 1.3-pentadiene and 1.4-
Examples include non-conjugated diolefins such as hexadiene, norbornene, and norbornene derivatives. The block composed of the olefin compound polymer is composed of at least one of the above compounds, and the unsaturation degree of the block is usually preferably 20% or less from the viewpoint of weather resistance and heat resistance. Therefore, when the above-mentioned diolefins are used as constituent units of the block, it is preferable to reduce the degree of unsaturation by a method such as hydrogenation so that the degree of unsaturation of the block does not exceed 20%. . The most preferred modified block copolymer in the present invention is a modified block copolymer comprising one, preferably two or more vinyl aromatic compound polymer blocks and an olefin compound polymer mainly composed of a conjugated gen compound. Wherein the weight ratio of the vinyl aromatic compound to the olefin compound is 5/95 to 50/5
0, preferably 10/90 to 30/70.

The block copolymer is modified by an addition reaction with an unsaturated carboxylic acid or a derivative thereof to obtain a modified block copolymer used in the present invention. Examples of unsaturated carboxylic acids or derivatives thereof include dicarboxylic acids such as maleic acid, fumaric acid, itaconic acid, and halogenated maleic acid, and acid anhydrides, esters, amides, imides, acrylic acids, and methacrylic acids of these dicarboxylic acids. Can be These can be used alone or in combination of two or more. Among them, unsaturated carboxylic acids are preferable, and maleic anhydride is more preferably used. The added amount of the carboxylic acid group or a derivative thereof contained in the modified block copolymer is usually 0.05 to 20 parts by weight, based on 100 parts by weight of the basic block copolymer.
Preferably it is 0.1 to 10 parts by weight, more preferably 0.3 to 5 parts by weight.

The elastomer used in the present invention may be used by mixing other elastomers such as a polyolefin elastomer, a diene elastomer, an acrylic elastomer, a polyamide elastomer, a polyester elastomer, a silicone elastomer, a fluorine elastomer and a polysulfide elastomer. Good. The compounding ratio of PPS in the resin composition of the present invention is 60 to 95 wt%, preferably 7 to 95 wt%.
It is in the range of 0 to 90 wt%. If the blending ratio is less than 60 wt%, the heat resistance of the control cable is insufficient, which is not preferable. On the other hand, the flexibility and toughness of the control cable, which exceeds 95 wt%, are insufficient.

The blending ratio of the elastomer is 5 to 40% by weight, preferably
It is in the range of 10 to 30 wt%.

The compound obtained by compounding the elastomer with the PPS is ASTM.
The flexural modulus as measured according to D790 is 10000~30000kg / cm ²
And a tensile elongation at break measured according to ASTM D638 of 5% or more. The flexural modulus is 30
If it exceeds 000 kg / cm ² , or if the tensile elongation at break is less than 5%, the flexibility is inferior, and it is practically difficult to route a control cable. Further, when the flexural modulus is less than 10,000 kg / cm ² , the deformation under a high load is large, and the wear is fast, so that the durability is inferior.

The method for preparing the resin composition of the present invention is not particularly limited to PPS.
Dry blending of resin and elastomer powders, pellets, and flakes using a ribbon blender, Henschel mixer, V blender, etc., followed by melt kneading using a Banbury mixer, mixing roll, single or twin screw extruder, kneader, etc. And the like.
Above all, a typical method is melt kneading using a single-screw or twin-screw extruder having a sufficient kneading force.

Further, the PPS resin composition used in the present invention, within a range that does not impair the effects of the present invention, an antioxidant, a heat stabilizer, a lubricant,
Conventional additives such as crystal nucleating agents, UV inhibitors, coloring agents, and flame retardants, and small amounts of various polymers can be added.Furthermore, known hydrogen peroxide and ditertiary butyl for the purpose of controlling the degree of crosslinking of PPS Peroxide crosslinking agents such as peroxides and dicumyl peroxide;
Crosslinking accelerators such as metal salts of thiophosphinic acids described in JP-A-131650 or dialkyltin dicarboxylates and aminotriazoles described in JP-A-58-204045 and JP-A-58-204046 It is also possible to mix a crosslinking inhibitor such as

Further, although not an essential component in the resin composition of the present invention, for the purpose of improving slidability, polytetrafluoroethylene,
10 wt% lubricant such as melamine cyanurate, silicone oil, molybdenum disulfide, graphite, boron nitride
% Of the resin composition of the present invention, particularly when the surface of the inner cable of the control cable is coated with the resin composition of the present invention.

Furthermore, in the present invention, a fibrous and / or granular reinforcing agent can be blended as needed within a range that does not impair the effects of the present invention.

Examples of such a fibrous reinforcing agent include inorganic fibers such as glass fiber, shirasu glass fiber, alumina fiber, silicon carbide fiber, ceramic fiber, asbestos fiber, masonry fiber, and metal fiber, and carbon fiber.

Examples of the granular reinforcing agent include silicates such as walasteinite, sericite, kaolin, mica, clay, bentonite, asbestos, talc, and alumina silicate, and metal oxides such as alumina, silicon chloride, magnesium oxide, zirconium oxide, and titanium oxide. Substances, carbonates such as calcium carbonate, magnesium carbonate and dolomide, sulfates such as calcium sulfate and barium sulfate, glass beads, boron nitride, silicon carbide, sialon and silica, etc., which may be hollow. . Two or more of these reinforcing agents can be used in combination, and if necessary, can be used after being pretreated with a silane-based or titanium-based coupling agent.

The method for molding the PPS resin composition used in the present invention as a coating for the inner cable for a control cable is not particularly limited, but extrusion molding with high work efficiency is suitable. The extruder to be used may be a commonly used isolation screw type extruder, but preferably has a capability of raising the temperature up to 350 ° C. Further, a mixing portion may be provided on a screw for increasing the kneading ability.
Then, to coat the outer periphery of the inner cable with the composition, using a commonly used crosshead die, the extruded resin is coated on the outer periphery of the inner cable, immersed in a cooling water tank, cooled and solidified, and then taken off. To obtain a take-off coat inner continuously.

[Action] The resin composition obtained by blending the elastomer with the PPS of the present invention is a material having flexibility and toughness in addition to the excellent heat resistance and slidability of the PPS. Therefore, a control cable using a coat inner formed of such a material as an inner cable has flexibility to be able to be routed, and has a high temperature,
High load efficiency and durability can be maintained even under severe conditions under high load.

When the inner cable covered with the elastomer-added PPS is combined with a conduit without a liner, for example, the load is
When the weight is 30kg or less, the durability is good even in a high temperature environment of 150 ° C or more. When the inner cable is combined with a liner formed of PPS or other heat-resistant synthetic resin, the load is reduced.
Excellent durability in high temperature environment even at 70kg or more.

Hereinafter, embodiments and effects of the present invention will be described with reference to examples.

Next, a control cable according to the present invention will be described with reference to the drawings.

FIG. 1 is a partially cutaway perspective view showing an embodiment of the control cable of the present invention, FIG. 2 is a schematic explanatory view of a measuring device for measuring the performance of the control cable of the present invention,
FIGS. 3 and 4 are graphs showing the measurement results of the durability and load efficiency of the control cables of the example and the comparative example.

FIG. 1 shows an embodiment of a control cable used for operation of a clutch or a brake of an automobile, in which (1) is an inner cable, (2) is a conduit, (3) is coating of an inner cable, and (4). ) Is a liner.

The outer diameter of the liner (4) is about 3.0 to 6.0 mm, and the inner diameter is about 2.0 to 5.0 mm.

The conduit (2) is placed on the liner (4), for example with a thickness of 0.5 to
An armor layer (5) in which a flat steel wire rolled to 2.0 mm and a width of 1.2 to 4.5 mm is wound closely on a spiral, and a thickness of 0.5 to
And a protective layer (6) made of a synthetic resin covered with 2.0 mm.

The inner cable (1) is generally formed by twisting a plurality of strands to form one strand, and then twisting the strands to provide flexibility and flex life. The diameter of the inner cable of the control cable used for the clutch and the brake is usually 2.0 to 4.0 mm.

The inner cable covering (3) is composed of PPS with 5 to 40 elastomer.
%, More preferably 10 to 30%, and has a flexural modulus of 10,000 to 30,000 kg / cm ² , especially 15,000 to 25,000.
A material in which the amount of the elastomer added is determined so as to be in the range of kg / cm ² is coated by extrusion molding.

The number of strands constituting the inner cable (1) and the number of steel strands constituting the strand are not particularly limited, and various conventionally known combinations can be employed.

Further, instead of the above-mentioned armor layer (5) wound with a flat steel wire, an armor layer in which a plurality of metal wires are densely wound at a gentle pitch on a liner (4) may be used for the conduit. . In this case, the same synthetic resin coating as the protective layer in FIG. 1 is provided.

Furthermore, it is preferable to apply silicone grease to the inner cable (1) or the coating (3) as a lubricant.

Next, a method for producing the PPS resin used in the present invention will be described below.

Reference Example 1 (Polymerization of PPS) In an autoclave, 3.26 kg of sodium sulfide (25 mol, containing 40% of water of crystallization), 4 g of sodium hydroxide, 1.3 kg of sodium acetate trihydrate (about 10 mol) and N-methyl-2 −
7.9 kg of pyrrolidone (hereinafter referred to as NMP) was charged, and the temperature was gradually raised to 205 ° C. while stirring to remove about 1.5 liters of distillate water containing 1.36 kg of water. 3.75 kg (25.5 mol) of 1,4-dichlorobenzene and 2 kg of NMP were added to the residual mixture,
Heat at 265 ° C. for 4 hours. The reaction product is heated in 70 ° C
Washed twice, dried under reduced pressure at 80 ° C for 24 hours, melt viscosity about 2500
Poise (320 ° C shear rate 10sec-1) powdered PPS (P
-1) About 2 kg was obtained. The same operation was repeated and used for the examples described below.

Reference Example 2 (Acid treatment of PPS) About 2 kg of the PPS powder obtained in Reference Example 1 was heated to 90 ° C.
The solution was poured into 20 liters of an aqueous solution of acetic acid at pH 4, stirred for about 30 minutes, filtered, and washed with deionized water at about 90 ° C. until the pH of the furnace solution reached 7. Further, the powder was dried under reduced pressure at 120 ° C. for 24 hours to obtain a powder, thereby obtaining acid-treated PPS (P-2).

Reference Example 3 (Hot water treatment of PPS) Approximately 2 kg of the PPS powder obtained in Reference Example 1 and 10 liters of deionized water were charged into an autoclave, and sealed at normal pressure.
The temperature was raised to 5 ° C., kept for about 30 minutes while stirring, and then cooled. Then take out the contents and filter, then 70 ° C
Immerse PPS in about 10 liters of deionized water, stir,
The operation of filtering was repeated 5 times. It was further dried under reduced pressure at 120 ° C. for 24 hours to obtain a hot water washed PPS (P-3).

Reference Example 4 (solvent washing of PPS) About 2 kg of the PPS powder obtained in Reference Example 1 was put into 20 liters of N-methylpyrrolidone (hereinafter referred to as NMP) heated to 100 ° C., stirred for about 30 minutes, and then filtered. Followed by about 90 ° C
Was washed with deionized water. This was dried under reduced pressure at 120 ° C. for 24 hours to obtain NMP washed PPS (P-4).

Next, the control cable of the present invention will be described with reference to specific examples and comparative examples.

Example 1 After 90% by weight of the acid-washed PPS (P-2) obtained in Reference Example 2 and 10% by weight of an ethylene-glycidyl methacrylate copolymer (copolymerization ratio: 88: 12% by weight), a φ30 m
m, supplied to a twin screw extruder, melt-kneaded at a temperature of 320 ° C., and pelletized by a pelletizer. ASTM D790, ASTM D638 for test pieces obtained by injection molding of these pellets
The flexural modulus was 25,000 kg / cm
^{In 2} , the tensile elongation at break was 8%.

Then, using the above-mentioned pellet on the outer periphery of an inner cable formed by twisting six metal wires having an outer diameter of 0.60 mm on a metal wire having an outer diameter of 0.65 mm, and further twisting 12 wires on the metal wire to have an outer diameter of 3.0 mm. The coating was formed by extrusion so that the outer diameter was 3.7 mm.

Also, a 2.3 mm wide, 1.0 mm thick flat steel wire is tightly wound to form an armor layer, and the outer diameter of the PF is 10.0 mm on the outer circumference.
A protective layer coated with resin A was formed to prepare a conduit.

Further, a control cable was prepared by inserting the inner cable coated with silicon-based grease into the conduit.

Example 2 70% by weight of the acid-washed PPS (P-2) obtained in Reference Example 2 and 30% by weight of an ethylene / glycidyl methacrylate copolymer (copolymerization ratio 94: 6% by weight) were pelletized in the same manner as in Example 1. Obtained. As a result of measuring the test piece obtained by injection-molding the pellet according to the above-mentioned measuring method, the flexural modulus was 15,000 kg / cm ² and the tensile elongation at break was 35%.

Then, a control cable was produced in the same manner as in Example 1 using an inner cable covered with an outer diameter of 3.7 mm.

Example 3 In the same manner as in Example 1, pellets were obtained from 60% by weight of the acid-washed PPS (P-2) obtained in Reference Example 2 and 40% by weight of the copolymer used in Example 2. As a result of measuring the test piece obtained by injection molding of the pellet based on the measurement method, the flexural modulus was 10,000 kg / cm ² and the tensile elongation at break was 60.
%Met.

Then, a control cable was produced in the same manner as in Example 1 using an inner cable covered with an outer diameter of 3.7 mm.

Comparative Example 1 Pellets were obtained in the same manner as in Example 1 by using 97% by weight of the NMP-washed PPS (P-4) obtained in Reference Example 4 and 3% by weight of the copolymer used in Example 1. As a result of measuring the test piece obtained by injection molding of the pellet based on the measurement method, the flexural modulus was 35,000 kg / cm ² and the tensile elongation at break was 4
%Met.

Then, a control cable was produced in the same manner as in Example 1 using an inner cable covered with an outer diameter of 3.7 mm.

Comparative Example 2 Pellets were obtained in the same manner as in Example 1 by using 50% by weight of the NMP-cleaned PPS (P-4) obtained in Reference Example 4 and 50% by weight of the copolymer used in Example 1. As a result of measuring the test piece obtained by injection molding of the pellet based on the above-described measurement method, the flexural modulus was 5000 kg / cm ² and the tensile elongation at break was 25%.
Met.

Then, a control cable was produced in the same manner as in Example 1 using an inner cable covered with an outer diameter of 3.7 mm.

Comparative Example 3 A control cable was produced in the same manner as in Example 1 except that a resin was used as a coating material for the inner cable, which was polybutylene terephthalate (hereinafter, referred to as PBT).

Next, Examples and Comparative Examples using an inner cable coated with a heat-resistant synthetic resin and the liner will be described.

Example 4 70% by weight of the hydrothermally treated PPS (P-3) obtained in Reference Example 3, 15% by weight of the copolymer used in Example 2, and ethylene
Pellets were obtained from 15 wt% of the propylene copolymer in the same manner as in Example 1. As a result of measuring a test piece obtained by injection-molding the pellet according to the above-described measurement method, the flexural modulus was 1,400 kg / cm ² and the tensile elongation at break was 40%.

Then, similarly to Example 1, a coating was formed on the outer periphery of the inner cable by extrusion molding using the pellets so as to have an outer diameter of 3.7 mm.

In addition, the outer diameter of 5.7m formed by the paste extrusion method
m, using a PTFE liner with an inner diameter of 4.7 mm, a width of 2.4 m around this outer circumference
m, forming an armor layer tightly wound with a flat steel wire with a thickness of 1.3 mm,
A protective layer coated with a PFA resin was formed on the outer periphery so as to have an outer diameter of 10.0 mm to prepare a conduit.

Further, a control cable was prepared by inserting the inner cable coated with silicon-based grease into the conduit.

Example 5 90% by weight of PPS (P-4) obtained in Reference Example 4, 10% by weight of copolymer used in Example 1, and 10% by weight of ionomer
Was obtained in the same manner as in Example 1. For the test piece obtained by injection molding the pellet, as a result of measurement based on the above measurement method, the flexural modulus is 24000kg / cm
^{In 2} , the tensile elongation at break was 9%.

Then, a coating was formed on the outer periphery of the inner cable by extrusion molding using the pellet so as to have an outer diameter of 3.7 mm.

A control cable was prepared in the same manner as in Example 1 except that a liner having an outer diameter of 5.7 mm and an inner diameter of 4.7 mm was molded from a nylon 66 resin containing a heat stabilizer by extrusion.

Example 6 80% by weight of PPS (P-4) obtained in Reference Example 4 and 20% by weight of a styrene / butadiene / styrene copolymer were used in Example 1.
A pellet was obtained in the same manner as described above. As a result of measuring a test piece obtained by injection-molding the pellet based on the above-mentioned measuring method, the flexural modulus was 22000 kg / cm ² and the tensile elongation at break was 10%.

Then, a coating was formed on the outer periphery of the inner cable by extrusion molding using the pellet so as to have an outer diameter of 3.7 mm.

A control cable was produced in the same manner as in Example 1, except that a liner having an outer diameter of 5.7 mm and an inner diameter of 4.7 mm was formed by extrusion using PFA resin.

Example 7 80% by weight of PPS (P-4) obtained in Reference Example 4, 10% by weight of the same copolymer as in Example 1, and 10% by weight of ethylene / propylene / diene copolymer were pelletized in the same manner as in Example 1. I got As a result of measuring the test piece obtained by injection-molding this pellet based on the above-mentioned measurement method, the flexural modulus was 13,500 kg / cm ² and the tensile elongation at break was 45%.

Then, a control cable was prepared in the same manner as in Example 4 except that a coating was formed on the outer periphery of the inner cable by using the pellets so as to have an outer diameter of 3.7 mm.

Example 8 Pellets were obtained in the same manner as in Example 1 by using 80% by weight of the PPS (P-4) obtained in Reference Example 4, 10% by weight of the same copolymer as in Example 1, and 10% by weight of a polyamide elastomer. The test piece obtained by injection molding of the pellet was measured based on the measurement method, and the flexural modulus was 15300 k.
At g / cm ² , the tensile elongation at break was 40%.

Then, a control cable was prepared in the same manner as in Example 4 except that a coating was formed on the outer periphery of the inner cable by using the pellets so as to have an outer diameter of 3.7 mm.

Example 9 Control was performed using the same composition as in Example 1 except that a coating was formed on the outer periphery of the inner cable so as to have an outer diameter of 3.7 mm, and a liner having an outer diameter of 5.7 mm and an inner diameter of 4.7 mm was formed by extrusion. A cable was made.

Comparative Example 4 Nylon without heat stabilizer added as liner
A control cable was prepared using the same inner cable as in Example 1 except that 66 resin was used, and using the same liner and conduit as in Example 1.

Comparative Example 5 Example 1 was repeated except that a PBT resin was used as the liner.
A control cable was prepared using the same inner cable as in.

Table 1 shows the materials of the coating (3) and the liner (4) of Examples 1 to 9 and Comparative Examples 1 to 5.

A bending test and an endurance test were performed on Examples 1 to 3 and Comparative Examples 1 to 5.

The bending test was performed by winding a coat inner at an angle of 360 ° around a cylinder having a radius of 30R at room temperature and environmental temperature, and investigating cracks in the coating of the inner cable. Table 2 shows the results of No. 2.

The test apparatus for the durability test will be described with reference to FIG.

The bending radius of the inner cable (1) is 150 mm in the room temperature bath (7),
A control cable of a specimen which was bent in a semicircle so that the bending angle was 180 ° was attached. A lever (8) is attached to the input end of the inner cable (1), and a spring (9) for applying a load is attached to the load end. When measuring the load efficiency, a load cell (10) can be taken in the middle of the input side of the inner cable (1), and another load cell (11) can be taken in the middle of the load side. The lever (8) swings as shown by the arrow (A), and one reciprocation
Reciprocating motion was performed at a speed of 30 times per minute. In addition,
The spring (9) has a stroke of 30 mm and a load of 30 kg in Examples 1 to 3 and Comparative Examples 1 to 3 without a liner, and Examples 4 to 9 and Comparative Examples 4 to 5 with a liner.
70 kg. The ambient temperature in the thermostat (7) is 180
C was kept. And the load efficiency is
Expressed as (W / F) x 100 (%) at 30kg or 70kg. However, (F) shows the load cell on the input side (1
0) is a measured value, and (W) is a measured value of the load-side load cell (11). The inner cable (1) was used for the durability test because the coating (3) was worn.
Line becomes visible or liner (4)
Is expressed by the number of times the lever (8) swings until the armor tank (5) of the conduit (2) becomes visible on the surface.

As is clear from Table 2, the results of the bending test show that the comparative example 1
The inner coat cannot withstand a bending of a radius of 30 mm, making it practically difficult to route control cables. As shown in FIG. 3, the control cable of Comparative Example 2
The wear is fast, the durability is reduced, and the control cable of Comparative Example 3 is inferior in durability.

On the other hand, the control cables of Examples 1 to 3 have high durability compared to Comparative Examples 1 to 3 because of their durability.

Next, the durability test results of the control cables of Examples 4 to 9 and Comparative Examples 4 to 5 with a load of 70 kg are shown in FIG.

When a heat-resistant synthetic resin is used for the coating of the inner cable, the load efficiency during durability is 70 kg, and the load efficiency is 80% to 90% with a durability of 1,000,000 times, and the comparative examples 4 and 5 are durable despite the high load. It can be seen that the load efficiency is remarkably excellent as compared with the case where the load efficiency is reduced when the number of times is 1,000,000 or less.

The amount of elastomer added to the PPS used for coating is 5
It is preferably about wt% to 40 wt%, and in such a range, there is an advantage that the control cable is flexible and exhibits high load efficiency and durability.

Furthermore, as can be seen from Fig. 3, the control cable using elastomer-added PPS for the liner has sufficiently high heat resistance and durability even when combined with an uncovered inner cable when the load is as low as 30 kg, and It is understood that there is a property.

As described above, it can be seen that the elastomer-added PPS has high performance in durability and load efficiency.

[Effects of the Invention] The control cable of the present invention has significantly improved durability and high load efficiency even in a high-temperature environment or under a high-temperature environment and under a high load, as compared with conventional control cables.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of the control cable of the present invention, FIG. 2 is a schematic explanatory view of a measuring device for measuring the performance of the control cable of the present invention,
FIG. 3 and FIG. 4 are graphs showing measurement results of durability and load efficiency of the control cables of the example and the comparative example. (Main symbols in drawings) (1): Inner cable (2): Conduit (3): Coating (4): Liner

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-231009 (JP, A) JP-A-2-138360 (JP, A) JP-A-63-152913 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) F16C 1/00-1/28

Claims (5)

(57) [Claims] 1. A control cable comprising an inner cable and a conduit for slidably guiding the inner cable, the control cable having an outer periphery of the inner cable coated with a composition in which an elastomer is blended with polyphenylene sulfide resin, A control cable, wherein the elastomer comprises, as an essential component, a copolymer of an α-olefin and a glycidyl ester of an α, β-unsaturated acid. 2. A control cable comprising an inner cable and a conduit for slidably guiding the inner cable, the control cable having an outer periphery of the inner cable coated with a composition comprising a polyphenylene sulfide resin and an elastomer. The elastomer is characterized in that a modified block copolymer obtained by bonding a molecular unit containing a carboxylic acid group or a derivative thereof to a block copolymer comprising a vinyl aromatic compound polymer and an olefin compound polymer is an essential component. And control cable. 3. The method according to claim 1, wherein the elastomer is used in an amount of 5% based on the total resin composition.
The control cable according to claim 1, wherein the control cable is contained in an amount of up to 40 wt%. 4. The composition has a flexural modulus of 10,000 to 30,000 kg.
/ cm ^2, and a tensile claim 1, wherein the control cable, wherein the breaking elongation of 5% or more. 5. A control cable having a liner interposed between the inner cable and the conduit, wherein the liner is made of a heat-resistant synthetic resin. Or the control cable of 4.