JP2016084449A - Abrasion resistant chlorine-based polymer composition and chlorine-based polymer coated cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an abrasion resistant chlorine-based polymer composition having both of excellent insulation property and abrasion resistance, excellent in mechanical strength such as tensile strength and tensile elongation without increase of viscosity during mixing and extrusion molding a chlorine-based polymer composition, and a chlorine-based polymer coated cable having a sheath layer (outer layer coating) formed by the chlorine-based polymer composition.SOLUTION: There are provided an abrasion resistant chlorine-based polymer composition containing a chlorine-based polymer and gel process silica having particle diameter of 1 μm to 20 μm and having the blended amount of the gel process silica of 1 pts.mass to 40 pts.mass based on 100 pts.mass of the chlorine-based polymer and a chlorine-based polymer coated cable having a sheath layer (outer layer coating) formed by the chlorine-based polymer composition.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a chlorine-based polymer composition (anti-wear property) that forms an outer layer covering material such as a cabtyre cable used as a power supply line of a mobile device used in a factory or a quick charge cable for an electric vehicle. Abrasive chlorine-based polymer composition).

  Cabtyre cables and electric vehicle quick charge cables used as power supply lines for mobile equipment used in factories usually bundle a number of insulated wires consisting of conductors and insulators that surround them, and the outer circumference is the outer layer. The structure is covered with a covering material. FIG. 1 is a cross-sectional view of an example of such a cabtyre cable (hereinafter simply referred to as “cable”), which is used as a feeder line for a mobile device in a factory.

  In the figure, 1 is a cable, 11 is a strand made of a conductor such as copper. In this example, the strand 11 is twisted to form a conductor wire 15. Each conductor wire 15 is covered with an insulating layer 12, and an insulated wire 16 is formed by the conductor wire 15 and the insulating layer 12. The insulating layer 12 is usually coated with an EP rubber composition that is colored differently to distinguish between the insulated wires.

  The cable 1 is a three-core cabtire cable composed of three insulated wires. The three insulated wires 16 are bundled as shown in the figure, and the outer periphery thereof is covered with an insulating outer layer covering material (hereinafter referred to as “sheath layer”) 13. Usually, in order to stably hold the three insulated wires 16 in the sheath layer 13, the space between these and the sheath layer 13 is filled with inclusions (insulation) 14.

  Power supply cables for mobile devices in factories and quick charge cables for electric vehicles are generally heavy and are often handled roughly, such as when they are used, they may move violently while rubbing against the floor surface. Accordingly, the sheath layer is required to have high wear resistance as well as excellent mechanical strength such as flexibility, tensile strength, and tensile elongation for facilitating the handling of the cable. A sheath layer having high wear resistance is preferable because the cable can be reduced in weight because it has sufficient wear resistance even if it is thinned, and it is easy to bend because of its flexibility, and the handling property is improved. Furthermore, since the sheath layer is required to have flame retardance to ensure safety during use, the material (sheath material) forming the sheath layer is wear resistant, flexible and flame retardant among polymers. It is common to use excellent chloroprene rubber or polyvinyl chloride (PVC).

  For example, in Patent Document 1, a high-voltage cabtire cable formed by extruding, coating and vulcanizing an inner layer sheath and a polychloroprene rubber outer layer sheath on the outer periphery of a single core or a plurality of cores (insulated wires) made of a copper conductor or the like. Is disclosed.

  In order to further improve the abrasion resistance of a rubber such as chloroprene rubber or a chlorine-based polymer composition such as PVC, a method of adding carbon black or silica to the chlorine-based polymer composition is known. For example, Non-Patent Document 1 discloses that the wear resistance of rubber is improved when carbon black or silica is added to the rubber composition.

  On the other hand, in Patent Document 2, as an electric wire excellent in high wear resistance, a hydrogen chloride of silicon tetrachloride purified into a vinyl chloride resin-based composition (vinyl chloride resin blended with a plasticizer, a stabilizer, etc.). A highly dispersible amorphous silica produced by gas phase hydrolysis in soot and composed of a combination of silica particles in the form of aerosols of ultrafine particles of silica in the form of agglomerated spherical particles An electric wire comprising an insulator is disclosed.

JP 2008-130367 A Japanese Patent No. 2893413

“Basics of Rubber Technology”, Japan Rubber Association, pp. 229

  However, carbon black is a conductive material. When the concentration is high, a chain structure is formed and a conductive circuit is formed in the polymer composition. If the amount of carbon black added exceeds a certain limit, the insulation resistance of the polymer composition is suddenly reduced, causing a risk of electric leakage. Therefore, there is a limit to the amount of carbon black added, and there has been a limit to improving the wear resistance by this method.

  As disclosed in Patent Document 2, it is known that when the fine particle silica is added, the wear resistance is improved. However, fine-particle silica has a very large surface area and has a large thickening effect because of its very large interaction with the resin. However, when a large amount of fine particle silica is added in order to obtain an effect of improving wear, the viscosity of the polymer composition is increased, so that shear heat generation during mixing and extrusion of the polymer composition is increased, and so-called burn is likely to occur. Torque exceeding the capacity of the extruder was generated, making extrusion impossible. Moreover, it became hard, there was a problem that the tensile elongation was lowered and the JIS standard was cracked. Accordingly, the amount of silica added is also limited, and there is a limit to the improvement of wear resistance by this method.

  The present invention has excellent insulation and wear resistance that cannot be obtained with conventional chlorine polymer compositions obtained by adding carbon black or silica to chlorine polymers such as chloroprene rubber and PVC, and also has tensile strength and tensile strength. It is an object of the present invention to provide an abrasion-resistant chlorine-based polymer composition that is excellent in mechanical strength such as elongation and does not increase in viscosity during mixing and extrusion molding of the chlorine-based polymer composition.

  The present invention also provides a chlorine-based polymer-coated cable formed of the above-mentioned chlorine-based polymer composition having excellent insulation and wear resistance, and having a sheath layer (outer layer coating) excellent in insulation and wear resistance. This is the issue.

  A first aspect of the present invention contains a chlorine-based polymer and a gel method silica having a particle diameter of 1 μm or more and 20 μm or less, and the amount of the gel method silica is 1 part by mass with respect to 100 parts by mass of the chlorine-based polymer. The wear-resistant chlorine-based polymer composition is 40 parts by mass or less.

  According to a second aspect of the present invention, there is provided a chlorinated polymer-coated cable having a conductor wire and an insulated wire made of an insulating layer covering the conductor wire, and a sheath layer (outer layer coating) covering the insulated wire, The sheath layer contains a chlorine-based polymer and a gel method silica having a particle diameter of 1 μm or more and 20 μm or less, and the amount of the gel method silica is 1 part by mass or more and 40 parts by mass with respect to 100 parts by mass of the chlorine-based polymer. It is a chlorine-based polymer-coated cable formed from the following wear-resistant chlorine-based polymer composition.

  According to the first aspect of the present invention, it has excellent insulation properties and abrasion resistance, is excellent in mechanical strength such as tensile strength and tensile elongation, and has viscosity during mixing and extrusion molding of a chlorine-based polymer composition. A wear-resistant chlorine-based polymer composition is provided that does not increase the slag.

  According to the second aspect of the present invention, it has a sheath layer that has both excellent insulation and wear resistance, and excellent mechanical strength such as tensile strength and tensile elongation. Provided is a chlorinated polymer-coated cable that is suitably used for rapid charging of automobiles.

It is sectional drawing which shows the structure of an example of a cabtire cable. It is a figure which shows typically the apparatus used for the abrasion ring test in an Example.

  Hereinafter, specific forms of the first and second embodiments will be described together with examples thereof. Note that the scope of the present invention is not limited to the following examples, and includes all modifications within the scope and equivalent scope described by the claims.

[First embodiment]
1. Configuration of the first aspect and its significance The first aspect includes a chlorine-based polymer and a gel method silica having a particle size of 1 μm or more and 20 μm or less, and the amount of the gel method silica is 100 parts by mass of the chlorine-based polymer. In contrast, the wear-resistant chlorine-based polymer composition is 1 part by mass or more and 40 parts by mass or less.

  As a result of intensive studies, the present inventor has found that if gel-type silica having a large secondary particle size is used instead of silica used in conventional wear-resistant chlorine-based polymer compositions, significant wear resistance can be achieved with a small addition amount. The effect of improving the properties can be obtained, and excellent insulation and wear resistance properties can be obtained by minimizing the increase in viscosity, tensile strength, decrease in tensile elongation, etc. during mixing and extrusion molding of chlorinated polymer compositions. The present invention has been completed. The first aspect provides a wear-resistant chlorine-based polymer composition that has both sufficient insulation and wear resistance and is suitable for forming a sheath layer. Moreover, since the increase in the viscosity at the time of mixing and extrusion molding of the chlorine-based polymer composition is small, burning during mixing or extrusion is prevented.

2. Constituent material of the first embodiment (1) Chlorine polymer Chlorine polymer means a polymer or rubber containing chlorine in the molecule. The chlorine-based polymer constituting the wear-resistant chlorine-based polymer composition of the first aspect is desired to have excellent mechanical strength, weather resistance, heat resistance, oil resistance, chemical resistance, and a type satisfying these requirements. The use of chlorinated polymers is preferred. Examples of chlorinated polymers that satisfy these requirements include chloroprene rubber, chlorosulfonated polyethylene, chlorinated polyethylene, and soft polyvinyl chloride resin (soft PVC resin).

  Among these, chloroprene rubber is excellent in mechanical strength, flexibility, weather resistance, heat resistance, oil resistance, chemical resistance, and flame resistance. Therefore, it is preferable to use chloroprene rubber because characteristics suitable for the sheath layer can be obtained and particularly excellent wear resistance can be obtained. Therefore, as a preferred embodiment of the first embodiment, an abrasion-resistant chlorine-based polymer composition in which the chlorine-based polymer is chloroprene rubber is provided.

  The kind of chloroprene rubber to be used is not particularly limited, and any kind of chloroprene rubber such as non-modified chloroprene rubber and various modified chloroprene rubbers can be used. There are three types of modified chloroprene rubbers, mercaptan-modified, xanthogen-modified, and sulfur-modified, depending on the vulcanization type, any of which can be used. However, when a mercaptan-modified chloroprene rubber or xanthogen-modified chloroprene rubber with better heat resistance is used, the occurrence of burns in the mixing process for preparing the chlorine-based polymer composition and the extrusion molding process for forming the wire coating, etc. It is preferable because the deterioration of quality due to the addition of heat is prevented.

(2) Gel Method Silica The abrasion-resistant chlorine-based polymer composition of the first aspect is characterized by blending gel method silica having a particle size of 1 μm or more and 20 μm or less. Examples of the silica include synthetic silica (amorphous synthetic silica and crystalline synthetic silica), natural silica (crystalline silica and amorphous silica), and the gel method silica is amorphous synthetic silica. In addition, it is silica obtained by filtering and drying a precipitate formed by neutralizing sodium silicate with an acid in an acidic environment.

  Among silicas, gel method silica has high cohesion of secondary particles, is not easily broken by shearing force during molding of chlorinated polymer composition, and maintains the size and shape of the original secondary particles after molding. The trend is great. In addition, the BET specific surface area is large and the interaction with the chlorine-based polymer is strong. Due to this feature, the gel silica replaces the chlorinated polymer during the wear test and receives the shearing force generated by the abrasive grains of the wear tester, reducing the damage the chlorinated polymer composition receives. It is thought that it is obtained.

  The gel method silica used in the present invention has an average particle size of 1 μm or more and 20 μm or less, more preferably 2 μm or more and 20 μm or less. If the average particle diameter of the gel method silica particles is larger than 20 μm, the tensile elongation decreases, and if it is smaller than 1 μm, sufficient wear resistance cannot be obtained. The average particle size and the particle size described later are values obtained from a particle size distribution obtained by observing a cross section of the chlorine-based polymer composition with an SEM and using image analysis software.

  When the content of particles having a particle size of 40 μm or more exceeds 0.3% by mass, the appearance of the extruded surface becomes rough. Therefore, the content of particles having a particle size of 40 μm or more in the gel method silica is 0.3 The mass% or less is preferable.

By setting the BET specific surface area of the gel method silica to 200 m ² / g or more, higher wear resistance can be obtained. On the other hand, when the BET specific surface area is larger than 400 m ² / g, the dispersibility of the gel method silica in the chlorine-based polymer composition tends to be lowered. Therefore, the BET specific surface area is preferably 200 m ² / g or more and 400 m ² / g or less. This BET specific surface area is a value measured according to JIS 8830: 2013, specifically under conditions normally employed by those skilled in the art by the nitrogen adsorption method.

(3) Blending amount of gel method silica In the wear-resistant chlorine-based polymer composition according to the first aspect, the blending amount of the gel method silica is 1 part by mass or more and 40 parts by mass with respect to 100 parts by mass of the chlorine polymer. It is the range below the mass part. When the blending amount of the gel method silica is less than 1 part by mass with respect to 100 parts by mass of the chlorine-based polymer, the wear resistance of the chlorine-based polymer composition is lowered. On the other hand, when the blending amount exceeds 40 parts by mass, the mechanical strength such as tensile elongation is lowered, and the increase in viscosity during mixing and extrusion molding of the chlorine-based polymer composition is increased, thereby achieving the object of the invention. I can't.

(4) Blending of carbon black In addition to the essential components described above, other components can be added to the wear-resistant chlorine-based polymer composition of the first aspect within a range that does not impair the spirit of the invention. For example, it is preferable to add carbon black because the wear resistance can be further improved.

  However, the compounding amount of carbon black is 25 parts by mass or less with respect to 100 parts by mass of the chlorinated polymer, and the total compounding amount of carbon black and gel method silica needs to be 40 parts by mass or less. When the blending amount of carbon black exceeds 25 parts by mass, the electrical insulation properties may be drastically lowered, possibly causing a leakage. In addition, when the total of carbon black and gel method silica exceeds 40 parts by mass, the melt viscosity of the chlorine-based polymer composition increases, and shear heat generation during mixing and extrusion molding of the chlorine-based polymer composition increases. It is not preferable because problems such as so-called burns and impossibility of extrusion are likely to occur. Therefore, as a preferred embodiment of the first embodiment, carbon black is added to the chlorine-based polymer composition, the amount of carbon black is 25 parts by mass or less with respect to 100 parts by mass of the chlorine-based polymer, and carbon A wear-resistant chlorine-based polymer composition in which the total amount of black and gel method silica is 40 parts by mass or less is provided.

  The carbon black used here is not particularly limited, but carbon black having a small particle diameter is suitable for obtaining high wear properties, and those having a high structure are preferable for the same particle diameter. However, the smaller the particle size, the more difficult it is to uniformly disperse in the chlorinated polymer. Examples of such preferable carbon black include Toast Carbon Co., Ltd., Seast 3H (arithmetic average particle diameter 27 μm), Seast 5H (arithmetic average particle diameter 22 μm), and Seast 9H (arithmetic average particle diameter 18 μm). .

(5) Other constituent materials In the abrasion-resistant chlorine-based polymer composition of the first aspect, additives other than those described above, for example, a lubricant, a reinforcing agent, and vulcanization acceleration, within a range not impairing the gist of the present aspect. Agents, vulcanization accelerators, antioxidants (antioxidants), acid acceptors, flame retardants, extenders (fillers), process oils, stabilizers, and the like can be added as necessary. However, since the addition of a plasticizer may reduce the wear resistance, it is usually preferable not to add it.

  Silica other than gel method silica and silane coupling agents such as polysulfide silane coupling agents can also be blended within a range that does not impair the spirit of the invention. Examples of the silica other than the gel method silica include amorphous synthetic silica, crystalline synthetic silica, and natural silica (crystalline silica and amorphous silica). As amorphous synthetic silica other than gel method silica, silicon such as precipitation method silica obtained by neutralizing sodium silicate with an acid in an alkaline environment, filtering the resulting precipitate and drying, silicon such as silicon tetrachloride Examples include pyrogenic silica obtained by burning a compound in an oxyhydrogen flame, and fused silica obtained by melting and spheroidizing a silica powder in a flame. In addition, it is a highly dispersible amorphous silica produced by gas phase hydrolysis of purified silicon tetrachloride in an oxyhydrogen tank as described in Patent Document 2, and spherical particles are aggregated in a chain and connected. In addition, there can be mentioned ultrafine amorphous silica in an aerosol state of silicon dioxide, for example, Aerosil 200 (average particle size of about 12 μm) and Aerosil 300 (average particle size of primary particles of about 7 μm) manufactured by Nippon Aerosil Co., Ltd.

2. Production of wear-resistant chlorine-based polymer composition of first aspect (Preparation of wear-resistant chlorine-based polymer composition)
The wear-resistant chlorine-based polymer composition of the first aspect is a known component such as a roll mixer, a single-screw kneading extruder, a twin-screw kneading extruder, a pressure kneader, a Banbury mixer, and a roll mixer. It can manufacture by mixing using a mixer. Mixing is performed so that the temperature of the chlorine-based polymer composition does not exceed 100 ° C. so that the vulcanization reaction does not proceed during mixing, and water cooling is performed as necessary.

[Second embodiment]
The second aspect of the present invention is:
A chlorinated polymer-coated cable having a conductor wire and an insulated wire comprising an insulating layer covering the conductor wire, and a sheath layer covering the insulated wire, the sheath layer comprising a chlorinated polymer and a particle diameter of 1 μm or more It is formed from a wear-resistant chlorine-based polymer composition containing a gel method silica of 20 μm or less, and the amount of the gel method silica is 1 part by mass or more and 40 parts by mass or less with respect to 100 parts by mass of the chlorine polymer. A chlorinated polymer-coated cable.

  In the second embodiment, the sheath layer is formed using the wear-resistant chlorine-based polymer composition of the first embodiment, that is, the wear-resistant chlorine-based polymer composition excellent in insulation and wear resistance. Therefore, there is provided a chlorinated polymer-coated cable that has excellent insulation properties and high wear resistance, and is suitably used for power supply to mobile equipment in a factory and rapid charging of an electric vehicle.

(1) Configuration of chlorine-based polymer-coated cable In the chlorine-based polymer-coated cable according to the second aspect, as shown in FIG. 1, 1 to several tens of insulated wires composed of conductor wires covered with an insulating layer (see FIG. In the example, three are bundled) and the outer periphery thereof is covered with a sheath layer. The insulating layers covering the conductor wires may be colored in different colors in order to distinguish each other from each other.
(2) Conductor wire Examples of the conductor constituting the conductor wire include copper and aluminum having excellent conductivity. The conductor wire may be a single wire or a stranded wire of a plurality of strands.
(3) Number of insulated wires (conductor wires) As described above, the number of insulated wires (conductor wires) is generally 1 to several tens. In general, EP rubber is coated as an insulating layer.

(4) Formation of sheath layer The sheath layer is formed of the abrasion-resistant chlorine-based polymer composition of the first aspect using a rubber extruder in the case of chloroprene rubber and a plastic extruder in the case of soft PVC resin. It is formed by extrusion molding on a bundle of conductor wires (or on an inclusion if any), and in particular in the case of chloroprene rubber, it is formed by vulcanization. Vulcanization can be performed by a known method. For example, a pressurized steam method can be mentioned, and this method is used as a vulcanization method for long objects, and is frequently used for vulcanization of electric wires and cables. However, since a high pressure is applied during vulcanization, the sheath layer and the insulating layer may be deformed. In order to avoid this problem, there is a can vulcanization method in which the temperature is somewhat low and high pressure is not applied. The thickness of the sheath layer is appropriately determined according to the size and use of the cable.

[1] Fabrication of cable Preparation of wear-resistant chlorine-based polymer composition (1) Material used (chlorine-based polymer)
Mercaptan-modified chloroprene rubber: Showrene TW (manufactured by Showa Denko)
Ethylene propylene rubber: EP21 (manufactured by JSR)
Polyvinyl chloride resin (soft PVC resin): ZEST 1300 (manufactured by Shin Daiichi PVC)

(Filler)
Firing clay: ST-CROWN (manufactured by Shiroishi Calcium Co.)
Heavy calcium carbonate: Whiten P-30 (manufactured by Shiroishi Calcium)
(Plasticizer)
Diisononyl phthalate: DINP (manufactured by Jay Plus)
(Flame retardants)
Antimony trioxide (manufactured by Yamanaka Sangyo Co., Ltd.)

(Carbon black)
Seast 3H (Tokai Carbon Co., Ltd.)

(silica)
Gel silica Silica Mizukacil P-705 (secondary particle size 3 μm: manufactured by Mizusawa Chemical Co., Ltd.)
Mizukasil P-709 (secondary particle size 8 μm: Mizusawa Chemical Co., Ltd.)
Mizukasil P-78D (secondary particle size 12 μm: manufactured by Mizusawa Chemical Co., Ltd.)
Mizukasil P-78F (secondary particle size 18 μm: Mizusawa Chemical Co., Ltd.)
CARPLEX BS-306 (secondary particle diameter 24.6 μm: manufactured by Evonik)
The secondary particle size is an average particle size calculated from the particle size distribution obtained by observing the cross section of the chlorine-based polymer composition with an SEM, obtaining the particle size distribution with image analysis software.
・ Dried silica Aerosil 200V (Primary particle size 12nm (Catalog value): Nippon Aerosil Co., Ltd.)

(Other additives)
Antioxidant: NOCRACK CD (Ouchi Shinsei Chemical Co., Ltd.)
Process oil: Diana process oil NP-24 (made by Idemitsu Kosan Co., Ltd.)
Lubricant: Stearic acid Magnesium oxide: Kyowa mug # 150 (Kyowa Chemical Industry Co., Ltd.)
Zinc oxide: 1 type of zinc oxide (manufactured by Sakai Chemical Co., Ltd.)
Vulcanization accelerator: Accel TS (manufactured by Kawaguchi Chemical Industry Co., Ltd.)
Lead-free PVC stabilizer: ADK STAB RUP-103 (manufactured by ADEKA)

(2) Mixing of materials The materials were blended in the blending amounts (units: parts by mass) shown in Tables 1 to 3, and mixed by a Banbury mixer. The chloroprene rubber was water-cooled so that vulcanization would not progress during mixing, and mixed so that the temperature of the chlorine-based polymer composition was 100 ° C. or less to prepare an abrasion-resistant chlorine-based polymer composition.

(3) Preparation of cable After mixing with a Banbury mixer to prepare a wear-resistant chlorine-based polymer composition, it was extended to a strip with an open roll, and chloroprene rubber and ethylene propylene rubber were directly coated on the conductor using a rubber extruder. Then, a heat vulcanization treatment was performed to produce a cable sample. The soft PVC resin was pelletized and then a cable sample was prepared using a plastic extruder. The extrusion of chloroprene rubber and ethylene propylene rubber was carried out with water cooling so that the rubber temperature did not exceed 100 ° C. The cable was manufactured by a design called 600V special movement type 2 EP rubber insulated chloroprene sheathed cabtyre cable (F-2PNCT) (3 cores, nominal cross-sectional area 38 mm ² , sheath layer thickness 3 mm).

[2] Cable evaluation Evaluation Method (1) Abrasion Resistance A wear wheel test was performed based on JIS K7204 to evaluate the abrasion resistance. Specifically, as shown in FIG. 2, a predetermined load (a weight of 5 kgf) 23 is suspended from the tip of the cable 1, and the other end is gripped by the gripping portion 22 of the wear wheel test apparatus 2, After pressing against the wear ring 21 and rotating the wear ring 21 a predetermined number of times (750 rotations) to wear the sheath layer (corresponding to the sheath layer 13 in FIG. 1), the state of the cable 1 (the sheath layer remaining after wear) (Referred to as “residual wear thickness”) and whether or not inclusions were exposed). The results are shown in Tables 4-6. When the inclusion (insulation) of the cable 1 (corresponding to the inclusion 14 in FIG. 1) is not exposed (the thickness of the sheath layer remaining after wear is greater than 0 mm) is passed and exposed Was rejected.

(2) Volume resistivity (insulation)
A test sample having a size of φ100 mm × t2.5 mm was prepared from the chlorine-based polymer composition using a hot press, and the electrical resistance was measured using the double ring electrode method defined in JIS K6271. Volume specific resistance values were determined from the measured values, and the results are shown in Tables 4-6. A volume resistivity value of ≧ 1 × 10 ⁹ Ω · m is accepted and <1 × 10 ⁹ Ω · m is rejected.

(3) Mooney Viscosity The Mooney viscosity of the abrasion-resistant chlorine-based polymer composition prepared as described above was measured under the conditions of (100 ° C., ML1 + 4), and the results are shown in Tables 4-6. 80 or less is accepted.

(4) Tensile strength and tensile elongation Based on JIS C 3005 4.16 (insulator and sheath tension), tensile strength and tensile elongation were measured, and the results are shown in Tables 4-6. The tensile strength was 13 MPa or more, and the tensile elongation was 300% or more.

  From Tables 4 to 6, the composition of the chlorine-based polymer composition is the condition of the first embodiment, that is, the particle diameter of the gel method silica is in the range of 1 μm to 20 μm, and the compounding amount of the gel method silica is rubber. In Experimental Examples 1 to 9 and Experimental Example 15, which are 1 part by mass or more and 40 parts by mass or less with respect to 100 parts by mass, abrasion resistance (wear thickness), volume resistivity, Mooney viscosity, tensile strength, tensile elongation All of the evaluation results passed. In Experimental Examples 1 to 7 and Experimental Examples 9 and 15, carbon black is blended, but the total blending amount of carbon black and gel method silica is 40 parts by mass or less.

  On the other hand, Experimental Example 11 in which silica is not blended, Experimental Example 10 in which the particle diameter of gel silica exceeds 20 μm, Experimental Example 12 in which fine dry silica is blended in place of gel silica, Gel having a particle diameter of 1 μm to 20 μm In Experimental Example 14 in which the compounding amount of the method silica is less than 1 part by mass with respect to 100 parts by mass of the polymer composition, the wear resistance (wear thickness) is unacceptable. In Experimental Example 13, in which 20 parts by mass of fine dry silica was blended with 100 parts by mass of the polymer composition instead of the gel silica, the abrasion resistance (wear thickness) was acceptable, but the Mooney viscosity and tensile strength were satisfactory. The evaluation of tensile elongation is rejected and does not achieve the object of the invention. Further, even in Experimental Example 16 in which the blending amount of the gel method silica exceeds 40 parts by mass with respect to 100 parts by mass of the chlorinated polymer, the evaluation of Mooney viscosity and tensile elongation was unacceptable, and the object of the invention was not achieved.

  In the wear-resistant chlorine-based polymer composition of the first aspect, an increase in viscosity during mixing / extrusion molding of the chlorine-based polymer composition is suppressed. Burns can be prevented. In addition, by using this wear-resistant chlorine-based polymer composition for forming a sheath layer, it is possible to provide a chlorine-based polymer-coated cable having excellent mechanical strength such as insulation, wear resistance, and tensile strength. The wear-resistant chlorine-based polymer composition of the second aspect obtained by using this wear-resistant chlorine-based polymer composition for forming a sheath layer is a cable used as a power supply line to a mobile device in a factory, It is preferably used as a cable for quick charging of automobiles.

DESCRIPTION OF SYMBOLS 1 Cable 2 Wear wheel test apparatus 11 Wire 12 Insulation layer 13 Sheath layer 14 Inclusion (insulation)
15 Conductor wire 16 Insulated wire 21 Wear wheel 22 Grip part 23 Weight

Claims (4)

  It contains a chlorinated polymer and a gel method silica having a particle diameter of 1 μm or more and 20 μm or less, and the blending amount of the gel method silica is 1 part by mass or more and 40 parts by mass or less with respect to 100 parts by mass of the chlorinated polymer. Abrasive chlorine-based polymer composition. The wear-resistant chlorine-based polymer composition according to claim 1, wherein the chlorine-based polymer is chloroprene rubber or polyvinyl chloride resin.   Furthermore, carbon black is contained, and the content of the carbon black is 25 parts by mass or less with respect to 100 parts by mass of the chlorine-based polymer, and the total content of the carbon black and the gel method silica is 40 parts by mass. The wear-resistant chlorine-based polymer composition according to claim 1 or 2, which is:   A chlorinated polymer-coated cable having a conductor wire and an insulated wire comprising an insulating layer covering the conductor wire, and a sheath layer covering the insulated wire, the sheath layer comprising a chlorinated polymer and a particle diameter of 1 μm or more It is formed from a wear-resistant chlorine-based polymer composition containing a gel method silica of 20 μm or less, and the amount of the gel method silica is 1 part by mass or more and 40 parts by mass or less with respect to 100 parts by mass of the chlorine polymer. Chlorinated polymer coated cable.

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