A flexible and twist-resistant moisture-proof control cable

Abstract

The present invention relates to the technical field of control cables, and provides a bend-resistant, torsion-resistant and moisture-proof control cable, which comprises a cable core and a sheath layer wrapped around the cable core; the sheath layer comprises the following raw materials in parts by weight: 60-80 parts of polyvinyl chloride, 5-10 parts of ASA resin, 8-12 parts of epoxidized natural rubber, 10-15 parts of filler, 1-3 parts of antioxidant, 1-4 parts of moisture-proof agent, 5-8 parts of plasticizer, and 2-4 parts of cross-linking agent; the melt index of the ASA resin at 220 °C and 10 kg is 8-10 g / min. Through the above technical solution, the problem of insufficient toughness of the sheath layer of the moisture-proof control cable in the related art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of control cables, and specifically, to a bend-resistant, torsion-resistant, and moisture-proof control cable. Background Art

[0002] In many fields such as modern industry, construction, and communication, cables, as key carriers for power and signal transmission, their performance directly affects the stability and reliability of system operation. Moisture-proof control cables, with excellent moisture-proof characteristics, are widely used in humid environments, underground laying, and other scenarios, and are an important part to ensure the normal operation of various facilities.

[0003] Currently, the sheath layer material of moisture-proof control cables mostly uses polyvinyl chloride (PVC). Although PVC has certain moisture-proof properties and processing convenience, there are strong polar interactions within its molecular chain, and the movement of chain segments is restricted, resulting in excessive rigidity and insufficient toughness of the material. When facing frequent bending and torsion conditions, the molecular chain is difficult to effectively dissipate energy through orientation, slip, etc., and is extremely prone to breakage, seriously affecting the service life of the cable.

[0004] Therefore, the problem of poor bend resistance and torsion resistance caused by insufficient toughness of the sheath layer of moisture-proof control cables not only limits the application range of cables under complex working conditions, but also increases the system maintenance cost and failure risk, and urgently needs to be solved to meet the growing demand for high-performance cables. Summary of the Invention

[0005] The present invention proposes a bend-resistant, torsion-resistant, and moisture-proof control cable, which solves the problem of insufficient toughness of the sheath layer of moisture-proof control cables in related technologies.

[0006] The technical solution of the present invention is as follows:

[0007] The present invention proposes a bend-resistant, torsion-resistant, and moisture-proof control cable, including a cable core and a sheath layer wrapped around the cable core;

[0008] The sheath layer comprises the following raw materials in parts by weight: 60 - 80 parts of polyvinyl chloride, 5 - 10 parts of ASA resin, 8 - 12 parts of epoxidized natural rubber, 10 - 15 parts of filler, 1 - 3 parts of antioxidant, 1 - 4 parts of moisture-proof agent, 5 - 8 parts of plasticizer, and 2 - 4 parts of cross-linking agent;

[0009] The melt index of the ASA resin at 220°C and 10 kg is 8 - 10 g / 10 min.

[0010] The ASA resin in the present invention is a terpolymer composed of acrylonitrile, styrene, and acrylate.

[0011] As a further technical solution, the antioxidant includes amine antioxidants and phosphite antioxidants.

[0012] In the present invention, the antioxidant is a compound system of amine antioxidants and phosphite antioxidants. During the use of the cable sheath layer, the amine antioxidant captures free radicals, and the phosphite antioxidant decomposes hydroperoxides. The two work together to block the oxidation process, ensuring that the sheath layer of the control cable maintains good performance in a complex environment for a long time and guaranteeing the stable operation of the cable.

[0013] As a further technical solution, the types of the amine antioxidants include one or more of antioxidant 405, antioxidant 1135, and antioxidant 445.

[0014] As a further technical solution, the types of the phosphite antioxidants include one or two of antioxidant 168 and antioxidant 626.

[0015] As a further technical solution, the moisture-proof agent includes one of calcium chloride and calcium oxide.

[0016] In the present invention, during the plastic processing, the raw materials contain moisture, which may cause processing difficulties, such as problems like bubbles and uneven surfaces. Adding calcium chloride or calcium oxide can remove the moisture in the raw materials, improve the processing performance of the plastic, and help obtain a control cable sheath layer with a smooth surface and good performance.

[0017] As a further technical solution, the plasticizer includes one or two of dioctyl phthalate and dibutyl phthalate.

[0018] In the present invention, due to the strong intermolecular forces between the polyvinyl chloride molecular chains, it is hard and lacks flexibility. The addition of the plasticizer can weaken the intermolecular interaction, making it easier to slide and deform, reducing the glass transition temperature, and reducing the risk of cable sheath damage caused by mechanical stress. At the same time, the plasticizer can reduce the viscosity of the polyvinyl chloride melt and improve its fluidity, resulting in excellent processability during the extrusion molding process of the cable sheath.

[0019] As a further technical solution, the crosslinking agent includes organic peroxides; for example, it can be one or two of dicumyl peroxide and tert-butyl peroxybenzoate.

[0020] In the present invention, the crosslinking effect of the crosslinking agent enhances the intermolecular forces between the high molecular chains of components such as polyvinyl chloride. When the cable may be subjected to various external forces such as bending and twisting, the crosslinked sheath layer can better resist these external forces, extending the service life of the cable. The internal structure of the crosslinked sheath layer is more compact, reducing the penetration channels of small molecules (such as water). This enhances the tolerance of the cable sheath to a humid environment and can better protect the internal cable core in some high-humidity environments, maintaining the normal operation of the cable.

[0021] As a further technical solution, the filler comprises polyphenylene sulfide fibers and metal oxides with a mass ratio of 1:3 to 3:1.

[0022] In the present invention, the polyphenylene sulfide fibers have a diameter of 10 to 20 μm and a length of 0.5 to 1.5 mm. The slender morphology can form an effective network skeleton structure in the polymer matrix. When the cable is bent or twisted, the fibers can effectively prevent the generation and propagation of internal cracks in the sheath layer, ensuring the toughness of the material. The particle size of the metal oxides is controlled in the range of 100 to 300 nm. Under the nano-size effect, the metal oxides perform excellently in aspects such as thermal aging protection. The polyphenylene sulfide fibers with specific sizes and the metal oxides act synergistically on the cable sheath layer to ensure the stable operation of the cable under complex working conditions.

[0023] As a further technical solution, the metal oxide comprises one of zirconium dioxide, titanium dioxide, and cerium dioxide.

[0024] As a further technical solution, the polyphenylene sulfide fibers have a diameter of 10 to 20 μm and a length of 0.5 to 1.5 mm.

[0025] As a further technical solution, the particle size of the metal oxide is 100 to 300 nm.

[0026] As a further technical solution, the polyphenylene sulfide fibers are calcium carbonate composite polyphenylene sulfide fibers.

[0027] As a further technical solution, the preparation method of the calcium carbonate composite polyphenylene sulfide fibers comprises the following steps:

[0028] A1. Mix calcium carbonate and a coupling agent solution, and dry to obtain pretreated calcium carbonate;

[0029] A2. Primarily mix the pretreated calcium carbonate and polyphenylene sulfide, and heat to 275 to 285 °C for a second mixing to obtain a mixture;

[0030] A3. Melt-spin the mixture to obtain calcium carbonate composite polyphenylene sulfide fibers.

[0031] During actual use, cables often generate heat due to the passage of current. Especially when operating under high loads or in high-temperature environments, the performance of ordinary sheath materials may decline due to overheating, and even pose safety hazards. In the present invention, when preparing the filler in the sheath layer of the control cable by compounding calcium carbonate and polyphenylene sulfide fibers, it is obtained by melt spinning after blending and adhering calcium carbonate and polyphenylene sulfide. In a high-temperature environment, the calcium carbonate in the calcium carbonate composite polyphenylene sulfide fiber can effectively absorb and conduct heat, inhibiting the sharp rise in temperature, while polyphenylene sulfide maintains the basic form of the structure by virtue of its own characteristics, improving the heat aging stability of the sheath layer of the control cable, enabling the cable to maintain structural integrity and physical properties at higher temperatures, thereby ensuring the stable operation of the cable in a high-temperature environment and preventing the occurrence of heat aging, and reducing the failure rate caused by overheating.

[0032] Meanwhile, the calcium carbonate composite polyphenylene sulfide fiber is used in common with metal oxides in the moisture-proof control cable sheath layer. The metal oxide particles are evenly dispersed in the sheath layer matrix, and the calcium carbonate composite polyphenylene sulfide fiber forms a network structure in the matrix. The two cooperate with each other. The metal oxide particles restrict the movement of the calcium carbonate composite polyphenylene sulfide fiber, and the stress is mutually transmitted between the metal oxide and the calcium carbonate composite polyphenylene sulfide fiber, effectively ensuring the heat aging resistance of the moisture-proof control cable sheath layer and enabling it to maintain excellent toughness when used in an overheated environment.

[0033] As a further technical solution, the mass ratio of the calcium carbonate to the coupling agent solution is 1:10 - 20;

[0034] The mass ratio of the coupling agent to the solvent in the coupling agent solution is 1:45 - 55.

[0035] As a further technical solution, the coupling agent includes coupling agent DL-411; the solvent includes toluene.

[0036] In the present invention, the coupling agent can be a silane coupling agent, a titanate coupling agent, an aluminate coupling agent, a zirconate coupling agent or a borate coupling agent; the model of the silane coupling agent can be one or two of KH-302 and KH-303; the model of the titanate coupling agent can be one or two of KR-TT2 and KR-TS; the model of the aluminate coupling agent can be one or two of DL-411 and DL-411D; the model of the zirconate coupling agent can be one or more of Zr-801, Zr-802 and Zr-803; the model of the borate coupling agent can be one or two of LD-100P and ZB-99; the coupling agent is preferably the aluminate coupling agent DL-411.

[0037] As a further technical solution, the raw materials of the calcium carbonate composite polyphenylene sulfide fiber include calcium carbonate and polyphenylene sulfide, and the mass of the calcium carbonate is 3% - 5% of the mass of the polyphenylene sulfide.

[0038] During the melt spinning process, in the raw materials of the calcium carbonate composite polyphenylene sulfide fiber, controlling the mass of the calcium carbonate to be 3% - 5% of the mass of the polyphenylene sulfide can improve the rheological properties of the spinning fluid, make the calcium carbonate particles disperse evenly in the polyphenylene sulfide melt, and adjust the viscosity of the melt to make it more beneficial to the spinning process, ensuring that the forming quality of the fiber is more uniform and stable, and reducing the occurrence of problems such as uneven fiber thickness and internal defects.

[0039] As a further technical solution, in step A1, the rotation speed during mixing is 2000 - 2500 rpm, and the time is 5 - 10 min;

[0040] In step A2, the temperature of the primary mixing is 25 - 35 °C, the rotation speed is 3000 - 4000 rpm, and the time is 15 - 20 min;

[0041] The rotation speed of the second mixing is 3000 - 4000 rpm, and the time is 8 - 12 min;

[0042] In step A3, the temperature of the melt spinning is 315 - 325 °C, and the spinning speed is 450 - 550 m / min.

[0043] The present invention also provides a method for preparing a bending-resistant, torsion-resistant and moisture-proof control cable for preparing the bending-resistant, torsion-resistant and moisture-proof control cable, including the following steps:

[0044] Mix the raw materials of the sheath layer, extrude and coat them outside the cable core, and crosslink to obtain a bending-resistant, torsion-resistant and moisture-proof control cable.

[0045] The working principle and beneficial effects of the present invention are as follows:

[0046] In the present invention, in the sheath layer material of the polyvinyl chloride moisture-proof control cable, ASA resin and epoxidized natural rubber are innovatively introduced. Among them, the selected ASA resin has specific melting characteristics. At 220 °C and 10 kg, its melt index is in the range of 8 - 10 g / 10 min. This characteristic makes the ASA resin have excellent processing performance when blended with the PVC matrix. At the same time, the ASA resin and epoxidized natural rubber cooperate. After being added to the PVC matrix and mixed, they can improve the toughness of the control cable sheath layer, meeting the higher requirements for the bending-resistant and torsion-resistant performance of the cable. Specific Embodiments

[0047] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0048] In the following examples and comparative examples, the type of polyvinyl chloride is S1000;

[0049] The ASA resin with a melt index of 8 g / 10 min at 220 °C and 10 kg has the model number XC230G;

[0050] The ASA resin with a melt index of 10 g / 10 min at 220 °C and 10 kg has the model number XC191;

[0051] The ASA resin with a melt index of 14 g / 10 min at 220 °C and 10 kg has the model number XD535;

[0052] The ASA resin with a melt index of 5 g / 10 min at 220 °C and 10 kg has the model number XC811;

[0053] The type of epoxidized natural rubber is ENR-50;

[0054] The type of polyphenylene sulfide is 6165A6 HF2000.

[0055] Example 1

[0056] The bend-resistant, torsion-resistant and moisture-proof control cable includes a cable core and a sheath layer wrapped around the cable core;

[0057] The sheath layer includes the following raw materials in parts by weight: 60 parts of polyvinyl chloride, 5 parts of ASA resin, 8 parts of epoxidized natural rubber, 10 parts of polyphenylene sulfide fiber (diameter 10 μm, length 0.5 mm), 0.5 part of antioxidant 445, 0.5 part of antioxidant 168, 1 part of calcium chloride, 5 parts of dioctyl phthalate, 2 parts of dicumyl peroxide; the ASA resin has a melt index of 8 g / 10 min at 220 °C and 10 kg;

[0058] The preparation method of the bend-resistant, torsion-resistant and moisture-proof control cable includes the following steps:

[0059] Mix the raw materials of the sheath layer, extrude and wrap them around the cable core, and crosslink to obtain the bend-resistant, torsion-resistant and moisture-proof control cable.

[0060] Example 2

[0061] Flexure-resistant, torsion-resistant and moisture-proof control cable, comprising a cable core and a sheath layer covering the cable core;

[0062] The sheath layer comprises the following raw materials in parts by weight: 80 parts of polyvinyl chloride, 10 parts of ASA resin, 12 parts of epoxidized natural rubber, 15 parts of zirconium dioxide (particle size 300 nm), 2 parts of antioxidant 445, 1 part of antioxidant 168, 4 parts of calcium chloride, 4 parts of dioctyl phthalate, 4 parts of dibutyl phthalate, 4 parts of dicumyl peroxide; The melt index of the ASA resin at 220 °C and 10 kg is 10 g / 10 min;

[0063] Preparation method of the flexure-resistant, torsion-resistant and moisture-proof control cable, comprising the following steps:

[0064] Mix the raw materials of the sheath layer, extrude and cover them outside the cable core, and crosslink to obtain the flexure-resistant, torsion-resistant and moisture-proof control cable.

[0065] Example 3

[0066] Flexure-resistant, torsion-resistant and moisture-proof control cable, comprising a cable core and a sheath layer covering the cable core;

[0067] The sheath layer comprises the following raw materials in parts by weight: 70 parts of polyvinyl chloride, 8 parts of ASA resin, 10 parts of epoxidized natural rubber, 12 parts of zirconium dioxide (particle size 100 nm), 1 part of antioxidant 445, 1 part of antioxidant 168, 2 parts of calcium chloride, 6 parts of dioctyl phthalate, 3 parts of dicumyl peroxide; The melt index of the ASA resin at 220 °C and 10 kg is 8 g / 10 min;

[0068] Preparation method of the flexure-resistant, torsion-resistant and moisture-proof control cable, comprising the following steps:

[0069] Mix the raw materials of the sheath layer, extrude and cover them outside the cable core, and crosslink to obtain the flexure-resistant, torsion-resistant and moisture-proof control cable.

[0070] Example 4

[0071] The difference between this example and Example 3 is only that the melt index of the ASA resin at 220 °C and 10 kg is 10 g / 10 min.

[0072] Example 5

[0073] The difference between this example and Example 3 is only that zirconium dioxide is replaced by polyphenylene sulfide fiber, the diameter of the polyphenylene sulfide fiber is 20 μm, and the length is 1.5 mm.

[0074] Example 6

[0075] The difference between this embodiment and Embodiment 3 is only that a quarter of the mass of zirconia is replaced with an equal amount of polyphenylene sulfide fibers, the diameter of the polyphenylene sulfide fibers is 20 μm, and the length is 1.5 mm.

[0076] Embodiment 7

[0077] The difference between this embodiment and Embodiment 6 is only that the polyphenylene sulfide fibers are replaced with silica composite polyphenylene sulfide fibers;

[0078] The preparation method of the silica composite polyphenylene sulfide fibers comprises the following steps:

[0079] A1. Mix the coupling agent DL-411 and toluene in a mass ratio of 1:45 to obtain a coupling agent solution. Add silica to the coupling agent solution, mix at a rotation speed of 2000 rpm for 10 min, and dry to obtain pretreated silica; the mass ratio of silica to the coupling agent solution is 1:10; the particle size of silica is 100 nm;

[0080] A2. Mix the pretreated silica and polyphenylene sulfide at 25 °C and a rotation speed of 3000 rpm for 20 min, heat to 275 °C, and mix at a rotation speed of 3000 rpm for 12 min to obtain a mixture; the mass of silica is 3% of the mass of polyphenylene sulfide;

[0081] A3. Melt the mixture at 315 °C and spin at a speed of 450 m / min to obtain silica composite polyphenylene sulfide fibers with a diameter of 20 μm and a length of 1.5 mm.

[0082] Embodiment 8

[0083] The difference between this embodiment and Embodiment 6 is only that the polyphenylene sulfide fibers are replaced with barium sulfate composite polyphenylene sulfide fibers;

[0084] The preparation method of the barium sulfate composite polyphenylene sulfide fibers comprises the following steps:

[0085] A1. Mix the coupling agent DL-411 and toluene in a mass ratio of 1:45 to obtain a coupling agent solution. Add barium sulfate to the coupling agent solution, mix at a rotation speed of 2000 rpm for 10 min, and dry to obtain pretreated barium sulfate; the mass ratio of barium sulfate to the coupling agent solution is 1:10; the particle size of barium sulfate is 100 nm;

[0086] A2. Mix the pretreated barium sulfate and polyphenylene sulfide at 25 °C and a rotation speed of 3000 rpm for 20 min, heat to 275 °C, and mix at a rotation speed of 3000 rpm for 12 min to obtain a mixture; the mass of barium sulfate is 3% of the mass of polyphenylene sulfide;

[0087] A3. Melt the mixture at 315 °C and spin it at a speed of 450 m / min to obtain barium sulfate composite polyphenylene sulfide fibers with a diameter of 20 μm and a length of 1.5 mm.

[0088] Example 9

[0089] The difference between this example and Example 6 is only that the polyphenylene sulfide fibers are replaced with calcium carbonate composite polyphenylene sulfide fibers;

[0090] The preparation method of the calcium carbonate composite polyphenylene sulfide fibers includes the following steps:

[0091] A1. Mix the coupling agent DL-411 and toluene at a mass ratio of 1:45 to obtain a coupling agent solution. Add calcium carbonate to the coupling agent solution and mix at a rotation speed of 2000 rpm for 10 min, then dry to obtain pretreated calcium carbonate; the mass ratio of calcium carbonate to the coupling agent solution is 1:10; the particle size of calcium carbonate is 100 nm;

[0092] A2. Mix the pretreated calcium carbonate and polyphenylene sulfide at 25 °C and a rotation speed of 3000 rpm for 20 min, then heat to 275 °C and mix at a rotation speed of 3000 rpm for 12 min to obtain a mixture; the mass of calcium carbonate is 3% of the mass of polyphenylene sulfide;

[0093] A3. Melt the mixture at 315 °C and spin it at a speed of 450 m / min to obtain calcium carbonate composite polyphenylene sulfide fibers with a diameter of 20 μm and a length of 1.5 mm.

[0094] Example 10

[0095] The difference between this example and Example 3 is only that three-quarters of the mass of zirconia is replaced with an equal amount of calcium carbonate composite polyphenylene sulfide fibers;

[0096] The preparation method of the calcium carbonate composite polyphenylene sulfide fibers includes the following steps:

[0097] A1. Mix the coupling agent DL-411 and toluene at a mass ratio of 1:55 to obtain a coupling agent solution. Add calcium carbonate to the coupling agent solution and mix at a rotation speed of 2500 rpm for 5 min, then dry to obtain pretreated calcium carbonate; the mass ratio of calcium carbonate to the coupling agent solution is 1:20; the particle size of calcium carbonate is 300 nm;

[0098] A2. Mix the pretreated calcium carbonate and polyphenylene sulfide at 35 °C and a rotation speed of 4000 rpm for 15 min, then heat to 285 °C and mix at a rotation speed of 4000 rpm for 8 min to obtain a mixture; the mass of calcium carbonate is 5% of the mass of polyphenylene sulfide;

[0099] A3. Melt the mixture at 325 °C and spin it at a speed of 550 m / min to obtain calcium carbonate composite polyphenylene sulfide fibers with a diameter of 20 μm and a length of 1.5 mm.

[0100] Comparative Example 1

[0101] The difference between this comparative example and Example 3 is only that in the raw materials of the sheath layer, no ASA resin is added, and 18 parts (by weight) of epoxidized natural rubber are added.

[0102] Comparative Example 2

[0103] The difference between this comparative example and Example 3 is only that in the raw materials of the sheath layer, no epoxidized natural rubber is added, and 18 parts (by weight) of ASA resin are added.

[0104] Comparative Example 3

[0105] The difference between this comparative example and Example 3 is only that the melt index of the ASA resin at 220 °C and 10 kg is 5 g / 10 min.

[0106] Comparative Example 4

[0107] The difference between this comparative example and Example 3 is only that the melt index of the ASA resin at 220 °C and 10 kg is 14 g / 10 min.

[0108] Experimental Example 1

[0109] The elongation at break of the sheath layers of the bend-resistant, torsion-resistant, and moisture-proof control cables prepared in Examples 1 to 4 and Comparative Examples 1 to 4 was tested in accordance with the standard GB / T 1040.3-2006 "Determination of Tensile Properties of Plastics - Part 3: Test Conditions for Films and Sheets". The specimen type was a 1B specimen, the specimen thickness was 1 mm, and the test speed was 50 mm / min. The results are shown in Table 1 below.

[0110] Table 1 Performance Test Results

[0111]

[0112] Compared with Comparative Examples 1 to 4, the elongation at break of the sheath layers of the bend-resistant, torsion-resistant, and moisture-proof control cables prepared in Examples 1 to 4 was higher, indicating that after epoxidized natural rubber was compounded with an ASA resin having a melt index of 8 - 10 g / 10 min at 220 °C and 10 kg and added to the polyvinyl chloride matrix, the toughness of the sheath layer of the control cable was improved, and it had excellent bend resistance and torsion resistance.

[0113] Experimental Example 2

[0114] The sheath layers of the bend-resistant, torsion-resistant, and moisture-proof control cables prepared in Example 3 and Examples 5 to 10 were respectively subjected to thermal aging at 135 °C for 168 h. According to the standard GB / T 1040.3-2006 "Determination of Tensile Properties of Plastics - Part 3: Test Conditions for Films and Sheets", the elongation at break of the sheath layer before and after thermal aging was tested. The specimen type was Type 1B, the specimen thickness was 1 mm, and the test speed was 50 mm / min. The results are shown in Table 2 below.

[0115] Table 2 Performance Test Results

[0116]

[0117] Compared with Example 3 and Examples 5 to 8, the change in the elongation at break of the sheath layer of the bend-resistant, torsion-resistant, and moisture-proof control cables prepared in Examples 9 to 10 after thermal aging was small, indicating that the synergistic effect of calcium carbonate and polyphenylene sulfide fiber and metal oxide improved the heat aging resistance of the sheath layer of the control cable.

[0118] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A flexible, torsion-resistant, moisture-proof control cable, characterized in that, It includes a cable core and a sheath layer covering the outside of the cable core; The sheath layer includes the following raw materials in parts by weight: 60 - 80 parts of polyvinyl chloride, 5 - 10 parts of ASA resin, 8 - 12 parts of epoxidized natural rubber, 10 - 15 parts of filler, 1 - 3 parts of antioxidant, 1 - 4 parts of moisture-proof agent, 5 - 8 parts of plasticizer, and 2 - 4 parts of cross-linking agent; The melt index of the ASA resin at 220°C and 10 kg is 8 - 10 g / 10 min; The filler includes polyphenylene sulfide fiber and metal oxide with a mass ratio of 1:3 - 3:1; The polyphenylene sulfide fiber is calcium carbonate composite polyphenylene sulfide fiber.

2. The moisture-proof control cable resistant to bending and torsion according to claim 1, characterized in that, The antioxidant includes amine antioxidant and phosphite antioxidant; The moisture-proof agent includes calcium chloride; The plasticizer includes one or two of dioctyl phthalate and dibutyl phthalate; The cross-linking agent includes organic peroxide.

3. The moisture-proof control cable resistant to bending and torsion according to claim 1, characterized in that, The diameter of the polyphenylene sulfide fiber is 10 - 20 μm, and the length is 0.5 - 1.5 mm.

4. A flexible, twist-resistant, moisture-proof control cable according to claim 1, characterized in that, The particle size of the metal oxide is 100 - 300 nm.

5. A bend-resistant, torsion-resistant, moisture-proof control cable according to claim 1, characterized in that, The preparation method of the calcium carbonate composite polyphenylene sulfide fiber includes the following steps: A1. Mix calcium carbonate and coupling agent solution, and dry to obtain pretreated calcium carbonate; A2. Primarily mix the pretreated calcium carbonate and polyphenylene sulfide, heat to 275 - 285°C for secondary mixing to obtain a mixture; A3. Melt-spin the mixture to obtain calcium carbonate composite polyphenylene sulfide fiber.

6. A bend-resistant, torsion-resistant, moisture-proof control cable according to claim 5, characterized in that, The mass ratio of the calcium carbonate to the coupling agent solution is 1:10 - 20; The mass ratio of the coupling agent to the solvent in the coupling agent solution is 1:45 - 55.

7. A bend-resistant, torsion-resistant, moisture-proof control cable according to claim 5, characterized in that, The raw materials of the calcium carbonate composite polyphenylene sulfide fiber include calcium carbonate and polyphenylene sulfide, and the mass of the calcium carbonate is 3% - 5% of the mass of the polyphenylene sulfide.

8. A bend-resistant, torsion-resistant, moisture-proof control cable according to claim 5, characterized in that In step A1, the rotation speed during mixing is 2000 - 2500 rpm, and the time is 5 - 10 min; In step A2, the temperature of the primary mixing is 25 - 35°C, the rotation speed is 3000 - 4000 rpm, and the time is 15 - 20 min; The rotation speed of the secondary mixing is 3000 - 4000 rpm, and the time is 8 - 12 min; In step A3, the temperature of the melt spinning is 315 - 325°C, and the spinning speed is 450 - 550 m / min.

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