Low-temperature-resistant special rubber cable material, cable as well as preparation method and application of cable

Abstract

The invention relates to the technical field of rubber cable materials, in particular to a low-temperature-resistant special rubber cable material, a cable and a preparation method and application of the low-temperature-resistant special rubber cable material. Comprising the following raw materials: 40-80 parts of SEBS thermoplastic elastomer, 20-40 parts of PP, 20-40 parts of PE, 10-20 parts of EPDM, 5-15 parts of NBR, 10-20 parts of modified calcium powder, 10-20 parts of white oil, 0.1-1 part of an antioxidant, 5-15 parts of a plasticizer, 1-3 parts of a vulcanizing agent and 2-6 parts of a compatilizer. The prepared low-temperature-resistant special rubber cable material has the advantages of high strength, good wear resistance and good thermal extensibility, and can resist the low temperature of-60 DEG C.

Description

Technical Field

[0001] The present invention relates to the technical field of rubber cable materials, and in particular to a low-temperature resistant special rubber cable material, a cable, and a preparation method and application thereof. Background Art

[0002] With the rapid development of the global economy and the continuous advancement of infrastructure construction, the demand for cables in industries such as electricity, communications, and transportation continues to grow. As a core material for wires and cables, the performance of rubber cable materials directly affects the service life and safety of cables. Currently, traditional rubber cable materials still need to be improved in terms of flexibility in low-temperature environments and stability in high-temperature environments. For example, in low-temperature environments, the insulation and sheath materials of cables tend to harden and become brittle, making them susceptible to cracking or damage when subjected to external forces. Furthermore, unsatisfactory thermal expansion properties can cause the material to soften and deform at high temperatures, resulting in reduced insulation performance and even safety hazards such as leakage.

[0003] Patent CN105255072A discloses a high and low temperature resistant rubber cable sheath material, the raw materials of which include: fluoroether rubber, hydrogenated nitrile rubber, acrylate rubber, tetrafluoroethylene-perfluoromethyl vinyl ether copolymer, zinc oxide, stearic acid, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, carbon black, nano silicon nitride, hollow glass microspheres, dioctyl phthalate, di[2-(2-butoxyethoxy)ethyl adipate], triallyl isocyanurate, zinc methacrylate, accelerator, antioxidant, dihydroxy polydimethylsiloxane, lanthanum stearate. The high and low temperature resistant rubber cable sheath material proposed in this invention has excellent high and low temperature resistance and oil resistance, and has good processing performance and aging resistance, and small compression permanent deformation. However, fluoroether rubber and tetrafluoroethylene-perfluoromethyl vinyl ether copolymer are expensive and difficult to industrialize.

[0004] Patent CN118956051A discloses a special cable resistant to extreme environments. The invention comprises, from the outside in, a sheath layer, an insulation layer, and a conductive core. The sheath layer is made of a sheath material comprising the following components by weight: 40-60 parts modified ethylene-vinyl acetate copolymer, 35-90 parts elastomer, 30-50 parts modified filler, 15-25 parts plasticizer, 3-8 parts POE-g-GMA, and 0.5-27 parts additive. The special cable provided by this invention has a sheath material that exhibits excellent oil and wear resistance, as well as good aging resistance and tensile properties. It is suitable for the production of special cables resistant to extreme environments, such as well logging cables, oil production cables, and heat-resistant cables. However, the method of modifying ethylene-vinyl acetate copolymer in this invention is to use halloysite modified with a silane coupling agent to modify the ethylene-vinyl acetate copolymer. The nanotubular structure of halloysite is easy to agglomerate, and even after surface modification, it may form local aggregation in the polymer matrix, affecting the mechanical properties of the composite material.

[0005] Therefore, the market urgently needs to develop a rubber cable material with excellent mechanical properties that is suitable for high and low temperature extreme environments. Summary of the Invention

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to obtain a low-temperature resistant special rubber cable material with excellent mechanical properties, wear resistance and thermal elongation properties and a simple preparation method.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] The first aspect of the present invention provides a low-temperature resistant special rubber cable material, which includes the following raw materials, in parts by weight: 40-80 parts of SEBS thermoplastic elastomer, 20-40 parts of PP, 20-40 parts of PE, 10-20 parts of EPDM, 5-15 parts of NBR, 10-20 parts of modified calcium powder, 10-20 parts of white oil, 0.1-1 part of antioxidant, 5-15 parts of plasticizer, 1-3 parts of vulcanizer, and 2-6 parts of compatibilizer.

[0009] The special rubber cable material prepared by blending SEBS thermoplastic elastomer, PP, PE, EPDM, NBR, modified calcium powder, plasticizer, antioxidant, flame retardant, and vulcanizing agent in this application can withstand low temperatures of -60°C and can be used normally in the harsh weather environment of Northern Europe, solving the problem that ordinary rubber is not resistant to low temperatures. The special rubber cable material also has the characteristics of good wear resistance and good thermal elongation, which can solve the problem that ordinary rubber does not rebound in thin diameters and is not resistant to rubbing. In addition, the special rubber cable material prepared in this application does not require additional vulcanization operations. It can be spontaneously vulcanized during the preparation process of the rubber cable material and the cable, and can also be irradiated at a high temperature of 150°C to further improve the wear resistance of the rubber material and make it non-sticky. In addition, SEBS thermoplastic elastomer and EPDM have excellent UV resistance and ozone resistance, making the special rubber more durable after being exposed to wind and sun.

[0010] In some embodiments, the PE is LLDPE.

[0011] In some embodiments, the method for preparing the modified calcium powder comprises the following steps:

[0012] A1. Add 3-aminopropyltriethoxysilane to dichloromethane, stir at room temperature for 20-30 min, add α-lipoic acid, maleic anhydride and N,N'-dicyclohexylcarbodiimide, react at 25-37°C for 2-3 h, filter, add toluene, and rotary evaporate to obtain the compound;

[0013] A2. Add calcium powder and calcium carbonate whiskers to deionized water and stir at room temperature for 20-30 minutes to obtain a slurry. Add the compound obtained in step A1 and deionized water to ethanol and stir at room temperature for 45-75 minutes. Add anhydrous ethanol and adjust the pH to 7-8. Add the slurry and heat to 60-80°C, stir for 6-10 hours, wash, centrifuge, and dry to obtain modified calcium powder.

[0014] In the prior art, Si-69 is often used to modify calcium powder to improve its dispersibility and enhance the bonding force between calcium powder and rubber. However, Si-69 molecules contain tetrasulfane groups. During high-temperature mixing or processing, these sulfur bonds are easily broken and participate in the vulcanization reaction, resulting in premature vulcanization of the rubber compound and scorching. This not only increases the difficulty of mixing, but may also cause uneven rubber performance. In response to the above problems, the present application synthesizes a modification system containing cyclic disulfide, double bond, silane coupling agent and carboxyl group by reacting 3-aminopropyltriethoxysilane with α-lipoic acid and maleic anhydride, and uses it to modify calcium powder. In addition, calcium carbonate whiskers are added during the modification process of calcium powder to make the modified rubber cable have better wear resistance, mechanical properties and high and low temperature resistance. This may be because, on the one hand, the introduction of carboxyl groups and double bonds enhances the interaction between the modified calcium powder and the SEBS thermoplastic elastomer and NBR through hydrogen bonding and π-π conjugation, improving the dispersion of the calcium powder in the rubber system and thereby enhancing the strength, wear resistance, and thermal elongation properties of the rubber cable material. On the other hand, the introduction of cyclic disulfide bonds and double bonds further promotes the formation of crosslinks within the rubber system, thereby improving the high-temperature and wear resistance of the rubber cable material. The simultaneous addition of calcium powder and calcium carbonate whiskers to the rubber system also increases the volume of the rubber material and enhances the heat dissipation capacity of the system. The cyclic disulfide bonds, compared to tetrasulfane groups, are more stable and can reduce scorching. Furthermore, the calcium carbonate whiskers dispersed in the system can be interspersed within the crosslinked network, restricting molecular chain motion and reducing defects within the crosslinked network. Furthermore, by improving the uniformity of the crosslinked network, they can reduce the tendency of the rubber cable material to crystallize at low temperatures, thereby improving the mechanical properties, wear resistance, low-temperature resistance, and thermal elongation properties of the rubber cable material.

[0015] At the same time, calcium powder and calcium carbonate whiskers can act as intermediate substances to connect the α-lipoic acid chain segment with the maleic anhydride chain segment, giving the substance a compatibilizing effect. The octanoic acid segment has good compatibility with PP and PE, while the double bond and carboxyl group have a strong interaction force with SEBS thermoplastic elastomer, which further improves the compatibility between PP, PE and SEBS thermoplastic elastomer. In addition, cyclic disulfide can participate in the vulcanization process of EPDM and NBR, making the mixing between the five polymers and between the polymer and calcium powder more uniform, which is beneficial to improving the wear resistance, mechanical properties and thermal elongation properties of the modified rubber cable material.

[0016] In some embodiments, the calcium powder is ultrafine heavy calcium.

[0017] In some embodiments, the mass ratio of the 3-aminopropyltriethoxysilane to α-lipoic acid is 1:(0.4-0.7).

[0018] In some embodiments, the mass ratio of 3-aminopropyltriethoxysilane to maleic anhydride is 1:(0.1-0.4)

[0019] The present application limits the ratio of 3-aminopropyltriethoxysilane and α-lipoic acid and 3-aminopropyltriethoxysilane and maleic anhydride to enable the modified rubber cable material to have good wear resistance and mechanical properties while having good thermal elongation properties. This may be because under this ratio, the distribution of octanoic acid segments, carboxyl groups and double bond groups can be more evenly distributed, thereby improving the compatibilization effect while maintaining a good vulcanization effect.

[0020] In some embodiments, the mass ratio of the calcium powder to the calcium carbonate whiskers is 1:(0.3-0.6)

[0021] In some embodiments, the mass ratio of calcium powder to compound in step A2 is 1:(0.05-0.2)

[0022] The present application limits the mass ratio of calcium powder and calcium carbonate whiskers and the mass ratio of calcium powder and compound to make the modified rubber cable material have better wear resistance and mechanical properties while having better thermal elongation and low temperature resistance. This may be because under this ratio, the calcium powder can have better dispersion while making the cross-linked network structure more uniform, reducing the crystallization tendency of the rubber cable material at low temperatures.

[0023] In some embodiments, the antioxidant is a combination of antioxidant 1010 and antioxidant 168, and the mass ratio of the antioxidant 1010 and antioxidant 168 is 1:(0.5-1).

[0024] In some embodiments, the plasticizer is one or more of dioctyl terephthalate, dioctyl sebacate, dioctyl phthalate, and di(2-ethylhexyl) terephthalate.

[0025] Preferably, the plasticizer is di(2-ethylhexyl) terephthalate.

[0026] In some embodiments, the vulcanizing agent is dicumyl peroxide.

[0027] In some embodiments, the compatibilizer is SEBS-g-MAH or EPDM-g-MAH.

[0028] A second aspect of the present invention provides a method for preparing a low-temperature resistant special rubber cable material, comprising the following steps:

[0029] S1. Add SEBS thermoplastic elastomer, PP, PE, EPDM, NBR, modified calcium powder, white oil, antioxidant, plasticizer, vulcanizing agent, and compatibilizer into a high-speed mixer and mix to obtain a premix;

[0030] S2. Add the premix into a twin-screw extruder for melt blending and extrusion granulation. The extrusion temperature is 180-220° C. and the screw speed is 100-200 r / min to obtain a low-temperature resistant special rubber cable material.

[0031] A third aspect of the present invention provides an application of a low-temperature resistant special rubber cable material in BH-YC, BH-YCW, BH-YZ, BH-YZW, BH-YH cables, mining and ship cables, and port machinery cables.

[0032] A fourth aspect of the present invention provides a method for preparing a low-temperature resistant special rubber cable, comprising the following steps:

[0033] B1. Preheat the conductor at 200-350℃ for 15-20min, draw multiple conductors and twist them together, apply insulation material while twisting, and dry to obtain cable cores;

[0034] B2. Twisting multiple cable cores obtained in step B1 into a cable to obtain a multi-core cable, and wrapping a low-temperature resistant special rubber cable material on the surface of the multi-core cable to obtain a low-temperature resistant special rubber cable.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] (1) The modified rubber cable material prepared by blending SEBS, PP, PE, EPDM, NBR, modified calcium powder, a compatibilizer, an antioxidant, etc. has the advantages of high strength and good wear resistance and excellent thermal elongation, and is suitable for high and low temperature extreme environments.

[0037] (2) The present invention synthesizes a modification system containing cyclic disulfide, double bond, silane coupling agent and carboxyl group by reacting 3-aminopropyltriethoxysilane with α-lipoic acid and maleic anhydride, and uses the modified system to modify calcium powder. On the one hand, the introduction of carboxyl group and double bond can enhance the interaction between the substances, improve the dispersibility of calcium powder in the rubber system and the compatibility between SEBS, PP, PE, EPDM and NBR, and thus help to improve the strength, wear resistance and thermal elongation of rubber cable material; on the other hand, the introduction of cyclic disulfide bond and double bond further promotes the formation of cross-linked structure in the rubber system, which helps to improve the high temperature resistance and wear resistance of rubber cable material.

[0038] (3) The present invention can further improve the wear resistance of rubber cable materials by introducing calcium carbonate whiskers into the rubber system, and the calcium carbonate whiskers dispersed in the system can be interspersed in the cross-linked network structure and can reduce defects in the cross-linked network by restricting the movement of molecular chains, thereby improving the strength, wear resistance and thermal extension performance of the rubber cable materials. DETAILED DESCRIPTION

[0039] The present invention will be described below in conjunction with specific embodiments. It should be noted that the following examples are illustrative of the present invention and are intended only to illustrate the present invention and are not intended to limit the present invention. Other combinations and various modifications within the scope of the present invention may be made without departing from the spirit or scope of the present invention.

[0040] In the following examples and comparative examples, except for the modified calcium powder, the other compounds and related reagents used can be purchased from the market. The average particle size of the ultrafine heavy calcium is 2000 mesh, purchased from Lingshou County Baixin New Material Technology Co., Ltd.; the model of SEBS thermoplastic elastomer is YH 522, purchased from Dongguan Shengli New Materials Co., Ltd.; the brand of PP is KF-T30S, purchased from Ningbo Jinfa New Materials Co., Ltd.; the model of LLDPE is Dow 2607G, purchased from Suzhou Shunwangjia International Trade Co., Ltd.; the model of EPDM is EPDM4045, purchased from China Petroleum Jilin Petrochemical Company; the brand of NBR is 3305E, purchased from Dongguan Zhengtao Plastic Co., Ltd.

[0041] Preparation Example 1

[0042] The preparation method of modified calcium powder-1 comprises the following steps:

[0043] A1. Add 10 g of 3-aminopropyltriethoxysilane to 50 g of dichloromethane, stir at room temperature for 25 min, add 5.5 g of α-lipoic acid, 2.5 g of maleic anhydride and 5 g of N,N'-dicyclohexylcarbodiimide, react at 30°C for 2.5 h, filter, add 50 g of toluene, and rotary evaporate to obtain the compound;

[0044] A2. Add 10 g of ultrafine heavy calcium and 4 g of calcium carbonate whiskers to 50 g of deionized water, stir at room temperature for 25 min to obtain a slurry, add 1 g of the compound obtained in step A1 and 5 ml of deionized water to 50 ml of ethanol, stir at room temperature for 60 min, add 200 ml of anhydrous ethanol and adjust the pH to 7, add the slurry, heat to 70 ° C and stir for 8 h, wash with anhydrous ethanol, centrifuge, and dry to obtain modified calcium powder-1.

[0045] Preparation Example 2

[0046] The preparation method of modified calcium powder-2 is the same as that of Preparation Example 1, except that the added amount of α-lipoic acid is 9 g.

[0047] Preparation Example 3

[0048] The preparation method of modified calcium powder-3 is the same as that of Preparation Example 1, except that the amount of maleic anhydride added is 6 g.

[0049] Preparation Example 4

[0050] The preparation method of modified calcium powder-4 is the same as that of Preparation Example 1, except that the added amount of calcium carbonate whiskers is 2g.

[0051] Preparation Example 5

[0052] The preparation method of modified calcium powder-5 is the same as that of Preparation Example 1, except that the added amount of the compound is 2.3 g.

[0053] Preparation Example 6

[0054] The preparation method of modified calcium powder-6 comprises the following steps:

[0055] A1. Add 10 g of 3-aminopropyltriethoxysilane to 50 g of dichloromethane, stir at room temperature for 25 min, add 5.5 g of α-lipoic acid, 2.5 g of maleic anhydride and 5 g of N,N'-dicyclohexylcarbodiimide, react at 30°C for 2.5 h, filter, add 50 g of toluene, and rotary evaporate to obtain the compound;

[0056] A2. Add 10 g of ultrafine heavy calcium carbonate to 50 g of deionized water and stir at room temperature for 25 min to obtain a slurry. Add 1 g of the compound obtained in step A1 and 5 ml of deionized water to 50 ml of ethanol and stir at room temperature for 60 min. Add 200 ml of anhydrous ethanol and adjust the pH to 7. Add the slurry, heat to 70 ° C and stir for 8 h. Wash with anhydrous ethanol, centrifuge, and dry to obtain modified calcium powder-6.

[0057] Example 1

[0058] A low-temperature resistant special rubber cable material comprises the following raw materials, measured in parts by weight: 60 parts of SEBS thermoplastic elastomer, 30 parts of PP, 30 parts of LLDPE, 15 parts of EPDM, 10 parts of NBR, 15 parts of modified calcium powder-1, 15 parts of white oil, 0.3 parts of antioxidant 1010, 0.2 parts of antioxidant 168, 10 parts of di(2-ethylhexyl) terephthalate, 2 parts of diisopropyl benzene peroxide, and 4 parts of EPDM-g-MAH.

[0059] The preparation method of the low-temperature resistant special rubber cable material of this embodiment comprises the following steps:

[0060] S1. Add SEBS thermoplastic elastomer, PP, LLDPE, EPDM, NBR, modified calcium powder-1, white oil, antioxidant 1010, antioxidant 168, di(2-ethylhexyl) terephthalate, dicumyl peroxide, and EPDM-g-MAH into a high-speed mixer and mix to obtain a premix;

[0061] S2. Add the premix into a twin-screw extruder for melt blending and extrusion granulation at an extrusion temperature of 200° C. and a screw speed of 150 r / min to obtain a low-temperature resistant special rubber cable material.

[0062] Example 2

[0063] A low-temperature resistant special rubber cable material comprises the following raw materials, measured in parts by weight: 40 parts of SEBS thermoplastic elastomer, 20 parts of PP, 20 parts of LLDPE, 10 parts of EPDM, 5 parts of NBR, 10 parts of modified calcium powder-1, 10 parts of white oil, 0.06 parts of antioxidant 1010, 0.04 parts of antioxidant 168, 5 parts of di(2-ethylhexyl) terephthalate, 1 part of diisopropyl benzene peroxide, and 2 parts of EPDM-g-MAH.

[0064] The preparation method of the low-temperature resistant special rubber cable material of this embodiment comprises the following steps:

[0065] S1. Add SEBS thermoplastic elastomer, PP, LLDPE, EPDM, NBR, modified calcium powder-1, white oil, antioxidant 1010, antioxidant 168, di(2-ethylhexyl) terephthalate, dicumyl peroxide, and EPDM-g-MAH into a high-speed mixer and mix to obtain a premix;

[0066] S2. Add the premix into a twin-screw extruder for melt blending and extrusion granulation at an extrusion temperature of 180° C. and a screw speed of 200 r / min to obtain a low-temperature resistant special rubber cable material.

[0067] Example 3

[0068] A low-temperature resistant special rubber cable material comprises the following raw materials, measured in parts by weight: 80 parts of SEBS thermoplastic elastomer, 40 parts of PP, 40 parts of LLDPE, 20 parts of EPDM, 15 parts of NBR, 20 parts of modified calcium powder-1, 20 parts of white oil, 0.6 parts of antioxidant 1010, 0.4 parts of antioxidant 168, 15 parts of di(2-ethylhexyl) terephthalate, 3 parts of diisopropyl benzene peroxide, and 6 parts of EPDM-g-MAH.

[0069] The preparation method of the low-temperature resistant special rubber cable material of this embodiment comprises the following steps:

[0070] S1. Add SEBS thermoplastic elastomer, PP, LLDPE, EPDM, NBR, modified calcium powder-1, white oil, antioxidant 1010, antioxidant 168, di(2-ethylhexyl) terephthalate, dicumyl peroxide, and EPDM-g-MAH into a high-speed mixer and mix to obtain a premix;

[0071] S2. Add the premix into a twin-screw extruder for melt blending and extrusion granulation at an extrusion temperature of 220° C. and a screw speed of 100 r / min to obtain a low-temperature resistant special rubber cable material.

[0072] Example 4

[0073] A low-temperature resistant special rubber cable material and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of modified calcium powder-1 is replaced by modified calcium powder-2.

[0074] Example 5

[0075] A low-temperature resistant special rubber cable material and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of modified calcium powder-1 is replaced by modified calcium powder-3.

[0076] Example 6

[0077] A low-temperature resistant special rubber cable material and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of modified calcium powder-1 is replaced by modified calcium powder-4.

[0078] Example 7

[0079] A low-temperature resistant special rubber cable material and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of modified calcium powder-1 is replaced by modified calcium powder-5.

[0080] Example 8

[0081] A low-temperature resistant special rubber cable material and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of modified calcium powder-1 is replaced by modified calcium powder-6.

[0082] Example 9

[0083] A method for preparing a low-temperature resistant special rubber cable comprises the following steps:

[0084] B1. Preheat the copper conductor at 270°C for 17 minutes, draw multiple copper conductors and twist them together, apply insulation material while twisting, and dry them to obtain a cable core;

[0085] B2. Twisting 50 cable cores obtained in step B1 into a cable to obtain a multi-core cable, and wrapping the low-temperature resistant special rubber cable material on the surface of the multi-core cable using an extruder to obtain a low-temperature resistant special rubber cable.

[0086] Comparative Example 1

[0087] A low-temperature resistant special rubber cable material and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of modified calcium powder-1 is replaced by ultrafine heavy calcium.

[0088] Performance Testing

[0089] According to Table 1, the low-temperature resistant special rubber cable materials obtained in the above embodiments and comparative examples were respectively applied to the preparation method of Example 9 to obtain various low-temperature resistant special rubber cables, and the performance of each low-temperature resistant special rubber cable was tested:

[0090] Table 1

[0091]

[0092] The test results are shown in Table 2:

[0093] Table 2

[0094]

[0095]

[0096] As shown in Table 1, the low-temperature resistant special rubber cable materials of Examples 1-3 have excellent mechanical properties, high and low temperature resistance and wear resistance. From the comparison of Examples 4 and 5 with Example 1, it can be seen that changing the ratio of 3-aminopropyltriethoxysilane and α-lipoic acid or the ratio of 3-aminopropyltriethoxysilane and maleic anhydride can make the octanoic acid segment, carboxyl group and double bond group unevenly distributed, so that the compatibilization effect or vulcanization effect deteriorates, thereby reducing the mechanical properties of the rubber cable material, and reducing the high and low temperature resistance and wear resistance. From the comparison of Example 6 and Example 1, it can be seen that changing the ratio of calcium powder and calcium carbonate whiskers can make the uniformity of the cross-linked network in the rubber cable material The uniformity is reduced, and it is easier to crystallize at low temperatures, resulting in a decrease in the mechanical properties of the rubber cable material, and a decrease in high and low temperature resistance and wear resistance; from the comparison of Example 7 and Example 1, it can be seen that when the ratio of calcium powder and the compound is changed, the rubber cable material is prone to scorching during the processing process, resulting in a decrease in the mechanical properties, wear resistance and high and low temperature resistance of the rubber cable material; from the comparison of Example 8 and Example 1, it can be seen that not adding calcium carbonate whiskers will cause the mechanical properties, wear resistance and high and low temperature resistance of the rubber cable material to deteriorate; from the comparison of Comparative Example 1 and Example 1, it can be seen that the mechanical properties, high and low temperature resistance and wear resistance of the rubber cable material are not good when ordinary calcium powder is used.

[0097] The above embodiments are only for illustrating the technical concept and features of the present invention. Its purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. It cannot be used to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A low-temperature resistant special rubber cable material, characterized in that: The invention comprises the following raw materials in parts by weight: 40-80 parts of SEBS thermoplastic elastomer, 20-40 parts of PP, 20-40 parts of PE, 10-20 parts of EPDM, 5-15 parts of NBR, 10-20 parts of modified calcium powder, 10-20 parts of white oil, 0.1-1 parts of antioxidant, 5-15 parts of plasticizer, 1-3 parts of vulcanizing agent and 2-6 parts of compatibilizer.

2. The low-temperature resistant special rubber cable material according to claim 1, characterized in that: The PE is LLDPE.

3. The low-temperature resistant special rubber cable material according to claim 1, characterized in that: The preparation method of the modified calcium powder comprises the following steps: A1. Add 3-aminopropyltriethoxysilane to dichloromethane, stir at room temperature for 20-30 min, add α-lipoic acid, maleic anhydride and N,N'-dicyclohexylcarbodiimide, react at 25-37°C for 2-3 h, filter, add toluene, and rotary evaporate to obtain the compound; A2. Add calcium powder and calcium carbonate whiskers to deionized water and stir at room temperature for 20-30 minutes to obtain a slurry. Add the compound obtained in step A1 and deionized water to ethanol and stir at room temperature for 45-75 minutes. Add anhydrous ethanol and adjust the pH to 7-8. Add the slurry and heat to 60-80°C, stir for 6-10 hours, wash, centrifuge, and dry to obtain modified calcium powder.

4. The low-temperature resistant special rubber cable material according to claim 3, characterized in that: The mass ratio of the 3-aminopropyltriethoxysilane to α-lipoic acid is 1:(0.4-0.7).

5. The low-temperature resistant special rubber cable material according to claim 3, characterized in that: The mass ratio of the 3-aminopropyltriethoxysilane to maleic anhydride is 1:(0.1-0.4).

6. The low-temperature resistant special rubber cable material according to claim 3, characterized in that: The mass ratio of the calcium powder to the calcium carbonate whisker is 1:(0.3-0.6).

7. The low-temperature resistant special rubber cable material according to claim 3, characterized in that: The mass ratio of the calcium powder to the compound in step A2 is 1:(0.05-0.2).

8. A method for preparing the low-temperature resistant special rubber cable material according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Add SEBS thermoplastic elastomer, PP, PE, EPDM, NBR, modified calcium powder, white oil, antioxidant, plasticizer, vulcanizing agent, and compatibilizer into a high-speed mixer and mix to obtain a premix; S2. Add the premix into a twin-screw extruder for melt blending and extrusion granulation. The extrusion temperature is 180-220° C. and the screw speed is 100-200 r / min to obtain a low-temperature resistant special rubber cable material.

9. Use of the low-temperature resistant special rubber cable material according to any one of claims 1 to 8, characterized in that: The low-temperature resistant special rubber cable material is used in BH-YC, BH-YCW, BH-YZ, BH-YZW, BH-YH cables, mining and ship cables, and port machinery cables.

10. A method for preparing a low-temperature resistant special rubber cable, characterized in that: The following steps are involved: B1. Preheat the conductor at 200-350℃ for 15-20min, draw multiple conductors and twist them together, apply insulation material while twisting, and dry to obtain cable cores; B2. Twisting multiple cable cores obtained in step B1 into a cable to obtain a multi-core cable, and wrapping a low-temperature resistant special rubber cable material on the surface of the multi-core cable to obtain a low-temperature resistant special rubber cable.

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