Cable with good bending resistance

Abstract

The invention relates to the field of cable manufacturing, discloses a cable with good bending resistance, and particularly discloses components of the cable with good bending resistance and a preparation method of the cable. The high-density polyethylene material is prepared from the following components in parts by weight: 90 to 95 parts of high-density polyethylene, 3 to 5 parts of butadiene styrene rubber, 0.1 to 1 part of peroxide initiator, 0.1 to 0.5 part of catalyst dibutyltin dilaurate, 5 to 15 parts of pentaerythritol triallyl ether, 0.1 to 1 part of antioxidant, 0.3 to 0.5 part of lubricant and 0.01 to 2 parts of coloring agent. According to the scheme, polyethylene resin and butadiene styrene rubber are subjected to a coupling reaction under the initiation of a peroxide coupling agent and are crosslinked with pentaerythritol triallyl ether to obtain three-dimensional network coupling-crosslinking modified polyethylene resin, so that the bending resistance of polyethylene is greatly improved; particularly, the olefin side chain of the pentaerythritol triallyl ether cross-linking agent is relatively long, so that the coupling-cross-linking modified polyethylene resin is endowed with relatively large telescopic displacement among molecules, and the bending resistance of a cable prepared from the coupling-cross-linking modified polyethylene resin is 1.8 times that of polyethylene.

Description

Technical Field

[0001] The invention relates to the field of cable manufacturing, and more specifically discloses a cable with good bending resistance. Background Art

[0002] Polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP) and other polymers are commonly used as main materials for cable sheaths. Polyethylene has excellent mechanical properties and processing properties, and its output ranks first among the five major general-purpose plastics. The molecular chain of polyethylene is a linear structure as a whole. Due to its structural characteristics, polyethylene has poor heat resistance and insufficient mechanical strength, which greatly limits its scope of use. Therefore, modifying polyethylene by physical or chemical means to improve some of its properties is a hot research direction.

[0003] With the continuous improvement of social mechanization and the rapid development of artificial intelligence, the market demand for cables with good bending resistance is increasing. Cable bending resistance solutions are generally divided into physical and chemical methods. Among them, the physical methods mainly include: changing the twisting method of the conductive wire, increasing the thickness of the sheath, adjusting the internal physical structure of the cable, adding additional bending-resistant sheaths, more advanced manufacturing processes, etc. The chemical methods mainly include: research and development of new sheath materials, improvement of existing sheath materials, etc.

[0004] At present, the synthesis and invention cycle of new functional materials has become longer, and the mechanical properties of many artificially synthesized materials have reached their limits. Improving the bending resistance of cables by physical means often requires more complex processing steps and equipment, which greatly increases the production cost and cannot meet market demand. Summary of the invention

[0005] Purpose of the invention: The purpose of the present invention is to provide a cable with good bending resistance.

[0006] Technical solution: A cable with good bending resistance, the cable is composed of an internal metal conductive wire and a protective sheath wrapped on the outer layer, the protective sheath formula is composed of the following components by weight: 90-95 parts of high-density polyethylene, 3-5 parts of styrene-butadiene rubber, 0.1-1 parts of peroxide initiator, 0.1-0.5 parts of catalyst dibutyltin dilaurate, 5-15 parts of pentaerythritol triallyl ether, 0.1-1 parts of antioxidant, 0.3-0.5 parts of lubricant, and 0.01-2 parts of colorant.

[0007] Preferably, the peroxide initiator is one of dicumyl peroxide and benzoyl peroxide.

[0008] Preferably, the antioxidant is one of antioxidant 1010, antioxidant B215, and antioxidant 168.

[0009] Preferably, the lubricant is a fatty acid.

[0010] Preferably, the thickness of the protective sleeve layer is 0.5-5 mm.

[0011] A method for preparing a cable with good bending resistance comprises the following steps: S1. Dry the high-density polyethylene under vacuum conditions at 50-60°C for 6-8h; S2. Add peroxide initiator, styrene-butadiene rubber, pentaerythritol triallyl ether, antioxidant, lubricant, colorant, catalyst and high-density polyethylene into a high-speed mixer according to the formula ratio, stir and mix evenly, and react at 20-25° C. for 30-48 hours to obtain a protective sheath liquid; S3, adding the protective sheath liquid prepared in step S2 into an extruder, setting the temperature of the extruder to 160-220° C., passing the metal conductive wire through the discharge port of the extruder, so that the outer side of the metal conductive wire is evenly coated with the molten protective sheath liquid, and then cooling and molding with cold water to obtain a coated cable; S4. Place the coated cable prepared in step S3 in a water bath at 80-95°C for 12-15 hours for cross-linking reaction, and then dry in a hot air circulation oven to obtain a cable with good bending resistance.

[0012] Preferably, in step S3: the head temperature of the screw extruder is 210°C, the temperature of other sections is 160-220°C, and the screw speed is 100-130r / min.

[0013] Beneficial effects: The scheme of the present invention obtains a three-dimensional network coupled-crosslinked polyethylene resin by coupling reaction of polyethylene resin and styrene-butadiene rubber under the initiation of peroxide, and crosslinking with pentaerythritol triallyl ether at the same time, thereby greatly improving the bending resistance of polyethylene, especially the olefin side chain of pentaerythritol triallyl ether crosslinking agent is longer, which gives the coupled-crosslinked polyethylene resin molecules a larger expansion displacement, thereby improving its bending resistance. DETAILED DESCRIPTION

[0014] The present invention will be described in detail below with reference to and in combination with the embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict. Example

[0015] Weigh 95kg of high-density polyethylene and dry it under vacuum at 50℃ for 8h; weigh 0.1kg of diisopropylbenzene peroxide, 3kg of styrene-butadiene rubber (SBR1500), 5kg of pentaerythritol triallyl ether, 0.1kg of antioxidant 1010, 0.3kg of fatty acid, 0.01kg of black pigment, and 0.1kg of dibutyltin dilaurate and add them into a high-speed mixer, then add 90kg of dried high-density polyethylene, stir and mix evenly, stir and react at 20℃ for 48h to obtain the protected The protective sheath liquid is added into the extruder, the head temperature of the screw extruder is 210°C, the temperature of other sections is 160-220°C, the screw speed is 100r / min, and the metal conductive wire passes through the discharge port of the extruder, so that the outer side of the metal conductive wire is evenly coated with the molten protective sheath liquid, the thickness of the protective sheath layer is 0.5mm, and it is formed by cold water cooling; the coated cable is placed in a water bath at 80°C, cross-linked for 15 hours, and then dried in a hot air circulation oven to obtain the cable.

[0016] Example 1

[0017] Weigh 96 kg of high-density polyethylene and dry it under vacuum at 60°C for 6 hours; weigh 1.0 kg of benzoyl peroxide, 5 kg of styrene-butadiene rubber (SBR1500), 10 kg of pentaerythritol triallyl ether, 1 kg of antioxidant B215, 0.5 kg of fatty acid, 2 kg of black pigment, and 0.5 kg of dibutyltin dilaurate, add them into a high-speed mixer, then add 93 kg of dried high-density polyethylene, stir and mix evenly, stir and react at 25°C for 30 hours to obtain a protective sheath material. liquid; adding the protective sheath liquid into the extruder, the head temperature of the screw extruder is 210°C, the temperature of other sections is 160~220°C, the screw speed is 130r / min, and the metal conductive wire passes through the discharge port of the extruder so that the outer side of the metal conductive wire is evenly coated with the molten protective sheath liquid, the thickness of the protective sheath layer is 5mm, and it is formed by cold water cooling; placing the coated cable wire in a 90°C water bath, cross-linking reaction for 12h, and then drying it in a hot air circulation oven to obtain the cable wire.

[0018] Example 2

[0019] Weigh 100 kg of high-density polyethylene and dry it under vacuum at 60°C for 6 hours; weigh 1.0 kg of benzoyl peroxide, 5 kg of styrene-butadiene rubber (SBR1500), 15 kg of pentaerythritol triallyl ether, 1 kg of antioxidant 168, 0.5 kg of fatty acid, 2 kg of black pigment, and 0.5 kg of dibutyltin dilaurate, add them into a high-speed mixer, then add 95 kg of dried high-density polyethylene, stir and mix evenly, stir and react at 25°C for 30 hours to obtain a protective sheath material. liquid; adding the protective sheath liquid into the extruder, the head temperature of the screw extruder is 210°C, the temperature of other sections is 160~220°C, the screw speed is 130r / min, and the metal conductive wire passes through the discharge port of the extruder so that the outer side of the metal conductive wire is evenly coated with the molten protective sheath liquid, the thickness of the protective sheath layer is 5mm, and it is formed by cold water cooling; placing the coated cable wire in a 95°C water bath, cross-linking reaction for 12h, and then drying it in a hot air circulation oven to obtain the cable wire.

[0020] Comparative Example 1 96 kg of high-density polyethylene was weighed and dried under vacuum conditions at 60°C for 6 hours; 1.0 kg of benzoyl peroxide, 3 kg of styrene-butadiene rubber (SBR1500), 1 kg of antioxidant B215, 0.5 kg of fatty acid, 2 kg of black pigment, and 0.5 kg of dibutyltin dilaurate were weighed and added into a high-speed mixer, and then 93 kg of dried high-density polyethylene was added, stirred and mixed evenly, and stirred and reacted at 25°C for 30 hours to obtain a protective sheath liquid; the protective sheath liquid was added into an extruder, the head temperature of the screw extruder was 210°C, the temperature of other sections was 160-220°C, the screw speed was 130 r / min, and the metal conductive wire was passed through the discharge port of the extruder so that the outer side of the metal conductive wire was evenly coated with the molten protective sheath liquid, the thickness of the protective sheath layer was 5 mm, and it was cooled and formed by cold water; the coated cable was placed in a 90°C water bath, cross-linked for 12 hours, and then dried in a hot air circulation oven to obtain the cable.

[0021] Comparative Example 2 Weigh 96 kg of high-density polyethylene and dry it under vacuum at 60°C for 6 hours; weigh 1.0 kg of benzoyl peroxide, 5 kg of styrene-butadiene rubber (SBR1500), 10 kg of vinyl trimethoxysilane, 1 kg of antioxidant B215, 0.5 kg of fatty acid, 2 kg of black pigment, and 0.5 kg of dibutyltin dilaurate, add them into a high-speed mixer, then add 93 kg of dried high-density polyethylene, stir and mix evenly, stir and react at 25°C for 30 hours to obtain a protective sheath material. liquid; adding the protective sheath liquid into the extruder, the head temperature of the screw extruder is 210°C, the temperature of other sections is 160~220°C, the screw speed is 130r / min, and the metal conductive wire passes through the discharge port of the extruder so that the outer side of the metal conductive wire is evenly coated with the molten protective sheath liquid, the thickness of the protective sheath layer is 5mm, and it is formed by cold water cooling; placing the coated cable wire in a 90°C water bath, cross-linking reaction for 12h, and then drying it in a hot air circulation oven to obtain the cable wire.

[0022] Test Case Test conditions: bending radius is 2.5 times the cable diameter; bending angle is ±90°; bending speed is 80 times / minute. Judgment criteria: If the resistivity change of the cable exceeds 30%, it is judged as failure.

[0023] The test results are shown in Table 1.

[0024] Table 1 Summary of test results of formulation combinations and material properties of examples and comparative examples

[0025] From the above results, it can be seen that the bending life of the cable prepared in Example 2 is 1.8 times that of Example 1 and 1.5 times that of Example 2, indicating that the cable prepared by the formula and preparation method of this scheme has good bending resistance, and the coupling-cross-linked network structure formed between the added pentaerythritol triallyl ether and polyethylene and styrene-butadiene rubber significantly improves the bending performance.

[0026] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention also fall within the protection scope of the present invention.

Claims

1. A cable with good bending resistance, characterized in that: The cable consists of an inner metal conductive wire and a protective sheath wrapped on the outer layer. The protective sheath formula consists of the following components by weight: 90-95 parts of high-density polyethylene, 3-5 parts of styrene-butadiene rubber, 0.1-1 parts of peroxide initiator, 0.1-0.5 parts of catalyst dibutyltin dilaurate, 5-15 parts of pentaerythritol triallyl ether, 0.1-1 parts of antioxidant, 0.3-0.5 parts of lubricant, and 0.01-2 parts of colorant.

2. A cable with good bending resistance according to claim 1, characterized in that: The peroxide initiator is one of dicumyl peroxide and benzoyl peroxide.

3. A cable with good bending resistance according to claim 1, characterized in that: The antioxidant is one of antioxidant 1010, antioxidant B215 and antioxidant 168.

4. A cable with good bending resistance according to claim 1, characterized in that: The lubricant is fatty acid.

5. A cable with good bending resistance according to claim 1, characterized in that: The thickness of the protective sleeve layer is 0.5-5mm.

6. A method for preparing a cable with good bending resistance according to claims 1-5, characterized in that: The following steps are involved: S1. Dry the high-density polyethylene under vacuum conditions at 50-60°C for 6-8h; S2. Add peroxide initiator, styrene-butadiene rubber, pentaerythritol triallyl ether, antioxidant, lubricant, colorant, catalyst and high-density polyethylene into a high-speed mixer according to the formula ratio, stir and mix evenly, and react at 20-25° C. for 30-48 hours to obtain a protective sheath liquid; S3, adding the protective sheath liquid prepared in step S2 into an extruder, setting the temperature of the extruder to 160-220° C., passing the metal conductive wire through the discharge port of the extruder, so that the outer side of the metal conductive wire is evenly coated with the molten protective sheath liquid, and then cooling and molding with cold water to obtain a coated cable; S4. Place the coated cable prepared in step S3 in a water bath at 80-95°C for 12-15 hours for cross-linking reaction, and then dry in a hot air circulation oven to obtain a cable with good bending resistance.

7. The method for preparing a cable with good bending resistance according to claim 6, characterized in that: In step S3, the head temperature of the screw extruder is 210°C, the temperature of other sections is 160-220°C, and the screw speed is 100-130r / min.

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