A water-blocking cable and a method for manufacturing the same

Abstract

This invention relates to the field of cable technology and proposes a water-blocking cable and its preparation method. A water-blocking cable comprises, from the inside out, a conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, a water-blocking layer, and an outer sheath layer. The outer sheath layer comprises the following components by weight: 15-20 parts of tetrafluoroethylene rubber, 40-50 parts of chlorosulfonated polyethylene, 20-30 parts of ethylene-butyl acrylate copolymer, 20-30 parts of filler, 1-3 parts of vulcanizing agent, 0.5-1.5 parts of co-vulcanizing agent, and 4-6 parts of stabilizer; the chlorine content in the chlorosulfonated polyethylene is 26wt%-35wt%; and the butyl acrylate content in the ethylene-butyl acrylate copolymer is 27wt%-35wt%. This technical solution solves the problem of poor impact resistance of the outer sheath layer in existing water-blocking cables.

Description

Technical Field

[0001] This invention relates to the field of cable technology, specifically to a water-blocking cable and its manufacturing method. Background Technology

[0002] In special application scenarios such as power transmission, communication networks, rail transit, building wiring, and marine, mining, and underground pipeline networks, cables, as the core carriers of power and signal transmission, are often used in complex and diverse environments, and frequently face water environment corrosion problems such as humidity, water accumulation, and seepage. The water-blocking performance of cables directly determines their transmission stability, service life, and operational safety. Therefore, water-blocking cables have become an important choice for cable applications in various fields.

[0003] In existing technologies, water-blocking cables typically incorporate a water-blocking layer within their structure and enhance overall protection through optimized outer sheath formulations. However, these technologies still suffer from some technical shortcomings, making it difficult to meet increasingly stringent application requirements. On one hand, the outer sheath of traditional water-blocking cables is often made from a single rubber or polyolefin material, or a simple blend of various polymer materials. Due to significant differences in polarity and compatibility between the components, phase separation and uneven dispersion are prone to occur, forming microscopic defects and stress concentration points. This results in poor impact resistance of the outer sheath, making it susceptible to cracking under external forces during transportation, laying, and use. External moisture can easily penetrate the cable through these cracks, damaging the water-blocking structure. This not only reduces the cable's insulation performance but can also cause short circuits, signal interruptions, and disrupt the normal operation of power and communication systems. Therefore, there is an urgent need for a water-blocking cable with superior impact resistance. Summary of the Invention

[0004] This invention proposes a water-blocking cable and its preparation method, which solves the problem of poor impact resistance of the outer sheath layer of water-blocking cables in related technologies.

[0005] The technical solution of the present invention is as follows:

[0006] This invention proposes a water-blocking cable, which, from the inside out, comprises a conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, a water-blocking layer, and an outer sheath layer. The outer sheath layer comprises the following components by weight: 15-20 parts of tetrafluoroethylene rubber, 40-50 parts of chlorosulfonated polyethylene, 20-30 parts of ethylene-butyl acrylate copolymer, 20-30 parts of filler, 1-3 parts of vulcanizing agent, 0.5-1.5 parts of co-vulcanizing agent, and 4-6 parts of stabilizer.

[0007] The chlorosulfonated polyethylene has a chlorine content of 26wt% to 35wt%; the ethylene-butyl acrylate copolymer has a butyl acrylate content of 27wt% to 35wt%.

[0008] As a further technical solution, the chlorine content in the chlorosulfonated polyethylene is 35wt%; the butyl acrylate content in the ethylene-butyl acrylate copolymer is 27wt%.

[0009] As a further technical solution, the filler composition includes inorganic powder, which includes one or more of talc, diatomaceous earth, and kaolin.

[0010] As a further technical solution, the filler also includes 4,6-diamino-2-thiopyrimidine.

[0011] The method for preparing the filler includes the following steps:

[0012] Inorganic powder was dispersed in a solvent, 4,6-diamino-2-thiopyrimidine hydrate was added, the mixture was stirred, concentrated, and dried to obtain the filler.

[0013] In the outer sheath layer of the water-blocking cable of the present invention, the filler is modified by using 4,6-diamino-2-thiopyrimidine hydrate to obtain 4,6-diamino-2-thiopyrimidine composite filler. This reduces the surface polarity and surface energy of the filler, improves its compatibility with the matrix, and makes the filler more uniformly dispersed in the ternary matrix of tetrafluoroethylene rubber, chlorosulfonated polyethylene, and ethylene-butyl acrylate copolymer. Furthermore, the thiol groups in 4,6-diamino-2-thiopyrimidine can participate in the co-crosslinking reaction, constructing an interfacial bridging structure between the filler and the rubber matrix, significantly improving the interfacial bonding strength, and further enhancing the impact resistance of the outer sheath layer of the water-blocking cable.

[0014] As a further technical solution, the mass ratio of the inorganic powder to the 4,6-diamino-2-thiopyrimidine hydrate is 50~60:6.

[0015] As a further technical solution, the stirring temperature is 60~70℃, and the stirring time is 3~4h.

[0016] As a further technical solution, the outer sheath layer also includes the following components in parts by weight: 4-10 parts compatibilizer, 15-24 parts flame retardant, 1-3 parts antioxidant, and 5-10 parts plasticizer.

[0017] As a further technical solution, the compatibilizer includes maleic anhydride-grafted polyethylene.

[0018] As a further technical solution, the flame retardant includes one or more of magnesium hydroxide, aluminum hydroxide, zinc borate, red phosphorus, and chlorinated paraffin;

[0019] Preferably, the flame retardant is magnesium hydroxide and / or aluminum hydroxide.

[0020] As a further technical solution, the antioxidant includes one or more of antioxidant 1010, antioxidant 1076, antioxidant 168, and antioxidant 3114;

[0021] Preferably, the antioxidant is composed of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1.

[0022] In this invention, the outer sheath of the water-blocking cable utilizes a combination of antioxidants 1010 and 168 to enhance its oxidation resistance. Antioxidant 1010 is a hindered phenolic antioxidant, while antioxidant 168 is a phosphite antioxidant. When used in a 1:1 mass ratio, antioxidant 1010 primarily captures and converts reactive free radicals into relatively stable products, thereby terminating the chain oxidation reaction. Antioxidant 168 primarily prevents the decomposition of hydroperoxides into reactive free radicals. Both antioxidants function at different stages of the oxidation reaction, complementing each other to comprehensively and efficiently inhibit the oxidation process of the cable's outer sheath.

[0023] As a further technical solution, the plasticizer includes one or two of dioctyl phthalate, diisooctyl adipate, and dioctyl sebacate.

[0024] In the outer sheath layer of the water-blocking cable of the present invention, one or two of dioctyl phthalate, diisooctyl adipate, and dioctyl sebacate are selected as plasticizers. Dioctyl phthalate, diisooctyl adipate, and dioctyl sebacate can insert into the molecular chains of the polymer, weaken the intermolecular forces, increase the activity space of the molecular chains, and thus improve the flexibility and processing fluidity of the polymer, thereby ensuring the flexibility of the outer sheath layer of the water-blocking cable.

[0025] As a further technical solution, the vulcanizing agent includes any one of vulcanizing agent BIPB and vulcanizing agent DCP; the vulcanizing co-co ...

[0026] As a further technical solution, the water-blocking layer is made of water-blocking tape.

[0027] This invention also proposes a method for preparing a water-blocking cable, comprising the following steps:

[0028] S1. A conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, and a water-blocking layer are sequentially arranged outside the conductor to obtain a semi-finished cable.

[0029] S2. Mix the components of the outer sheath layer, extrude them to cover the cable semi-finished product, and vulcanize them to obtain the water-blocking cable.

[0030] The working principle and beneficial effects of this invention are as follows:

[0031] In this invention, the impact resistance of the outer sheath of the water-blocking cable is improved by using chlorosulfonated polyethylene with a chlorine content of 26wt%~35wt% and ethylene-butyl acrylate copolymer with a butyl acrylate content of 27wt%~35wt%. Firstly, the chlorosulfonated polyethylene with a chlorine content of 26wt%~35wt% possesses both rigidity and elasticity, effectively absorbing external impact energy and preventing cracking of the outer sheath. Simultaneously, by controlling the content of the polar chlorine groups, interfacial compatibility with tetrafluoroethylene propylene rubber is ensured, reducing interfacial defects. Secondly, the polarity of the ethylene-butyl acrylate copolymer with a butyl acrylate content of 27wt%~35wt% is highly matched with that of the chlorosulfonated polyethylene and tetrafluoroethylene propylene rubber, improving the dispersion uniformity among the components. Therefore, when chlorosulfonated polyethylene with a specific chlorine content and ethylene-butyl acrylate copolymer with a specific butyl acrylate content are compounded with tetrafluoroethylene propylene rubber, they can form a uniform and continuous interpenetrating cross-linked structure, reducing micro-defects and stress concentration points, making the material less prone to crack propagation when subjected to external impact, thereby significantly improving the impact resistance of the outer sheath layer. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0033] In the following examples and comparative examples, the tetrafluoroethylene rubber is model AFLAS 150E; the chlorosulfonated polyethylene with a chlorine content of 23 wt% is model TS-320; the chlorosulfonated polyethylene with a chlorine content of 26 wt% is model ET-8010; the chlorosulfonated polyethylene with a chlorine content of 35 wt% is model TS-530; the chlorosulfonated polyethylene with a chlorine content of 43 wt% is model Poly-S604; the ethylene-butyl acrylate copolymer with a butyl acrylate content of 27 wt% is model ELVALOY™ AC 3427; the ethylene-butyl acrylate copolymer with a butyl acrylate content of 35 wt% is model ELVALOY™ AC 34035; the ethylene-butyl acrylate copolymer with a butyl acrylate content of 17 wt% is model ELVALOY™ AC 3717; the maleic anhydride grafted polyethylene is model GT6; and the ethylene-vinyl acetate copolymer is model ELVALOY™ AC. 2618; the model of the ethylene-methyl acrylate copolymer is ELVALOY™ AC 1218; the average particle size of talc is 3μm; the average particle size of diatomaceous earth is 3μm; the average particle size of kaolin is 3μm; the average particle size of magnesium hydroxide is 5μm; the average particle size of aluminum hydroxide is 5μm.

[0034] Example 1

[0035] A water-blocking cable comprises, from the inside out, a conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, a water-blocking tape layer, and an outer sheath layer.

[0036] The outer sheath layer comprises the following components by weight: 15 parts tetrafluoroethylene propylene rubber, 40 parts chlorosulfonated polyethylene (chlorine content 26 wt%), 20 parts ethylene-butyl acrylate copolymer (butyl acrylate content 27 wt%), 20 parts talc, 1 part BIPB vulcanizing agent, 0.5 parts TMPTMA co-vulcanizing agent, 4 parts calcium zinc stabilizer, 4 parts maleic anhydride grafted polyethylene, 15 parts magnesium hydroxide, 0.5 parts antioxidant 1010, 0.5 parts antioxidant 168, and 5 parts dioctyl phthalate;

[0037] A method for preparing a water-blocking cable includes the following steps:

[0038] S1. A conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, and a water-blocking tape layer are sequentially arranged outside the conductor to obtain a semi-finished cable.

[0039] S2. Mix the components of the outer sheath layer, extrude them to cover the cable semi-finished product, and vulcanize at 180°C for 15 minutes to obtain a water-blocking cable.

[0040] Example 2

[0041] A water-blocking cable comprises, from the inside out, a conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, a water-blocking tape layer, and an outer sheath layer.

[0042] The outer sheath layer comprises the following components by weight: 20 parts tetrafluoroethylene rubber, 50 parts chlorosulfonated polyethylene (chlorine content 35wt%), 30 parts ethylene-butyl acrylate copolymer (butyl acrylate content 35wt%), 15 parts diatomaceous earth, 15 parts kaolin, 3 parts vulcanizing agent DCP, 1.5 parts co-vulcanizing agent TAIC, 6 parts barium zinc stabilizer, 10 parts maleic anhydride grafted polyethylene, 12 parts magnesium hydroxide, 12 parts aluminum hydroxide, 1.5 parts antioxidant 1076, 1.5 parts antioxidant 168, 5 parts diisooctyl adipate, and 5 parts dioctyl sebacate.

[0043] A method for preparing a water-blocking cable includes the following steps:

[0044] S1. A conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, and a water-blocking tape layer are sequentially arranged outside the conductor to obtain a semi-finished cable.

[0045] S2. Mix the components of the outer sheath layer, extrude them to cover the cable semi-finished product, and vulcanize at 180°C for 15 minutes to obtain a water-blocking cable.

[0046] Example 3

[0047] A water-blocking cable comprises, from the inside out, a conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, a water-blocking tape layer, and an outer sheath layer.

[0048] The outer sheath layer comprises the following components in parts by weight: 18 parts tetrafluoroethylene propylene rubber, 45 parts chlorosulfonated polyethylene (chlorine content 26 wt%), 25 parts ethylene-butyl acrylate copolymer (butyl acrylate content 27 wt%), 30 parts talc, 2 parts vulcanizing agent BIPB, 1 part co-vulcanizing agent TMPTMA, 5 parts calcium zinc stabilizer, 8 parts maleic anhydride grafted polyethylene, 20 parts magnesium hydroxide, 1 part antioxidant 1010, 1 part antioxidant 168, and 8 parts dioctyl phthalate;

[0049] A method for preparing a water-blocking cable includes the following steps:

[0050] S1. A conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, and a water-blocking tape layer are sequentially arranged outside the conductor to obtain a semi-finished cable.

[0051] S2. Mix the components of the outer sheath layer, extrude them to cover the cable semi-finished product, and vulcanize at 180°C for 15 minutes to obtain a water-blocking cable.

[0052] Example 4

[0053] A water-blocking cable comprises, from the inside out, a conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, a water-blocking tape layer, and an outer sheath layer.

[0054] The outer sheath layer comprises the following components by weight: 18 parts tetrafluoroethylene propylene rubber, 45 parts chlorosulfonated polyethylene (chlorine content 35wt%), 25 parts ethylene-butyl acrylate copolymer (butyl acrylate content 35wt%), 30 parts talc, 2 parts BIPB vulcanizing agent, 1 part TMPTMA co-vulcanizing agent, 5 parts calcium zinc stabilizer, 8 parts maleic anhydride grafted polyethylene, 20 parts magnesium hydroxide, 1 part antioxidant 1010, 1 part antioxidant 168, and 8 parts dioctyl phthalate;

[0055] A method for preparing a water-blocking cable includes the following steps:

[0056] S1. A conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, and a water-blocking tape layer are sequentially arranged outside the conductor to obtain a semi-finished cable.

[0057] S2. Mix the components of the outer sheath layer, extrude them to cover the cable semi-finished product, and vulcanize at 180°C for 15 minutes to obtain a water-blocking cable.

[0058] Example 5

[0059] A water-blocking cable comprises, from the inside out, a conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, a water-blocking tape layer, and an outer sheath layer.

[0060] The outer sheath layer comprises the following components in parts by weight: 18 parts tetrafluoroethylene propylene rubber, 45 parts chlorosulfonated polyethylene (chlorine content 26 wt%), 25 parts ethylene-butyl acrylate copolymer (butyl acrylate content 35 wt%), 30 parts talc, 2 parts vulcanizing agent BIPB, 1 part co-vulcanizing agent TMPTMA, 5 parts calcium zinc stabilizer, 8 parts maleic anhydride grafted polyethylene, 20 parts magnesium hydroxide, 1 part antioxidant 1010, 1 part antioxidant 168, and 8 parts dioctyl phthalate;

[0061] A method for preparing a water-blocking cable includes the following steps:

[0062] S1. A conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, and a water-blocking tape layer are sequentially arranged outside the conductor to obtain a semi-finished cable.

[0063] S2. Mix the components of the outer sheath layer, extrude them to cover the cable semi-finished product, and vulcanize at 180°C for 15 minutes to obtain a water-blocking cable.

[0064] Example 6

[0065] A water-blocking cable comprises, from the inside out, a conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, a water-blocking tape layer, and an outer sheath layer.

[0066] The outer sheath layer comprises the following components by weight: 18 parts tetrafluoroethylene propylene rubber, 45 parts chlorosulfonated polyethylene (chlorine content 35 wt%), 25 parts ethylene-butyl acrylate copolymer (butyl acrylate content 27 wt%), 30 parts talc, 2 parts BIPB vulcanizing agent, 1 part TMPTMA co-vulcanizing agent, 5 parts calcium zinc stabilizer, 8 parts maleic anhydride grafted polyethylene, 20 parts magnesium hydroxide, 1 part antioxidant 1010, 1 part antioxidant 168, and 8 parts dioctyl phthalate;

[0067] A method for preparing a water-blocking cable includes the following steps:

[0068] S1. A conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, and a water-blocking tape layer are sequentially arranged outside the conductor to obtain a semi-finished cable.

[0069] S2. Mix the components of the outer sheath layer, extrude them to cover the cable semi-finished product, and vulcanize at 180°C for 15 minutes to obtain a water-blocking cable.

[0070] Example 7

[0071] A water-blocking cable comprises, from the inside out, a conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, a water-blocking tape layer, and an outer sheath layer.

[0072] The outer sheath layer comprises the following components by weight: 18 parts tetrafluoroethylene propylene rubber, 45 parts chlorosulfonated polyethylene (chlorine content 35 wt%), 25 parts ethylene-butyl acrylate copolymer (butyl acrylate content 27 wt%), 30 parts composite talc, 2 parts vulcanizing agent BIPB, 1 part co-vulcanizing agent TMPTMA, 5 parts calcium zinc stabilizer, 8 parts maleic anhydride grafted polyethylene, 20 parts magnesium hydroxide, 1 part antioxidant 1010, 1 part antioxidant 168, and 8 parts dioctyl phthalate;

[0073] The preparation method of composite talc powder includes the following steps:

[0074] Talc powder was dispersed in DMF, and 4,6-diamino-2-thiopyrimidine hydrate was added. The mixture was stirred at 70°C for 3 hours, concentrated, and dried to obtain composite talc powder. The mass-volume ratio of talc powder to DMF was 1 g: 5 mL, and the mass ratio of talc powder to 4,6-diamino-2-thiopyrimidine hydrate was 50: 6.

[0075] A method for preparing a water-blocking cable includes the following steps:

[0076] S1. A conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, and a water-blocking tape layer are sequentially arranged outside the conductor to obtain a semi-finished cable.

[0077] S2. Mix the components of the outer sheath layer, extrude them to cover the cable semi-finished product, and vulcanize at 180°C for 15 minutes to obtain a water-blocking cable.

[0078] Example 8

[0079] A water-blocking cable comprises, from the inside out, a conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, a water-blocking tape layer, and an outer sheath layer.

[0080] The outer sheath layer comprises the following components by weight: 18 parts tetrafluoroethylene propylene rubber, 45 parts chlorosulfonated polyethylene (chlorine content 35 wt%), 25 parts ethylene-butyl acrylate copolymer (butyl acrylate content 27 wt%), 30 parts composite talc, 2 parts vulcanizing agent BIPB, 1 part co-vulcanizing agent TMPTMA, 5 parts calcium zinc stabilizer, 8 parts maleic anhydride grafted polyethylene, 20 parts magnesium hydroxide, 1 part antioxidant 1010, 1 part antioxidant 168, and 8 parts dioctyl phthalate;

[0081] The preparation method of composite talc powder includes the following steps:

[0082] Talc powder was dispersed in DMF, and 4,6-diamino-2-thiopyrimidine hydrate was added. The mixture was stirred at 60°C for 4 hours, concentrated, and dried to obtain composite talc powder. The mass-volume ratio of talc powder to DMF was 1 g: 5 mL, and the mass ratio of talc powder to 4,6-diamino-2-thiopyrimidine hydrate was 60: 6.

[0083] A method for preparing a water-blocking cable includes the following steps:

[0084] S1. A conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, and a water-blocking tape layer are sequentially arranged outside the conductor to obtain a semi-finished cable.

[0085] S2. Mix the components of the outer sheath layer, extrude them to cover the cable semi-finished product, and vulcanize at 180°C for 15 minutes to obtain a water-blocking cable.

[0086] Comparative Example 1

[0087] A water-blocking cable comprises, from the inside out, a conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, a water-blocking tape layer, and an outer sheath layer.

[0088] The outer sheath layer comprises the following components in parts by weight: 18 parts tetrafluoroethylene propylene rubber, 45 parts chlorosulfonated polyethylene (chlorine content 26wt%), 25 parts ethylene-vinyl acetate copolymer, 30 parts talc, 2 parts BIPB vulcanizing agent, 1 part TMPTMA co-vulcanizing agent, 5 parts calcium zinc stabilizer, 8 parts maleic anhydride grafted polyethylene, 20 parts magnesium hydroxide, 1 part antioxidant 1010, 1 part antioxidant 168, and 8 parts dioctyl phthalate;

[0089] A method for preparing a water-blocking cable includes the following steps:

[0090] S1. A conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, and a water-blocking tape layer are sequentially arranged outside the conductor to obtain a semi-finished cable.

[0091] S2. Mix the components of the outer sheath layer, extrude them to cover the cable semi-finished product, and vulcanize at 180°C for 15 minutes to obtain a water-blocking cable.

[0092] Comparative Example 2

[0093] A water-blocking cable comprises, from the inside out, a conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, a water-blocking tape layer, and an outer sheath layer.

[0094] The outer sheath layer comprises the following components in parts by weight: 18 parts tetrafluoroethylene propylene rubber, 45 parts chlorosulfonated polyethylene (chlorine content 26wt%), 25 parts ethylene-methyl acrylate copolymer, 30 parts talc, 2 parts BIPB vulcanizing agent, 1 part TMPTMA co-vulcanizing agent, 5 parts calcium zinc stabilizer, 8 parts maleic anhydride grafted polyethylene, 20 parts magnesium hydroxide, 1 part antioxidant 1010, 1 part antioxidant 168, and 8 parts dioctyl phthalate;

[0095] A method for preparing a water-blocking cable includes the following steps:

[0096] S1. A conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, and a water-blocking tape layer are sequentially arranged outside the conductor to obtain a semi-finished cable.

[0097] S2. Mix the components of the outer sheath layer, extrude them to cover the cable semi-finished product, and vulcanize at 180°C for 15 minutes to obtain a water-blocking cable.

[0098] Comparative Example 3

[0099] A water-blocking cable comprises, from the inside out, a conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, a water-blocking tape layer, and an outer sheath layer.

[0100] The outer sheath layer comprises the following components by weight: 18 parts tetrafluoroethylene propylene rubber, 45 parts chlorosulfonated polyethylene (chlorine content 23wt%), 25 parts ethylene-butyl acrylate copolymer (butyl acrylate content 17wt%), 30 parts talc, 2 parts BIPB vulcanizing agent, 1 part TMPTMA co-vulcanizing agent, 5 parts calcium zinc stabilizer, 8 parts maleic anhydride grafted polyethylene, 20 parts magnesium hydroxide, 1 part antioxidant 1010, 1 part antioxidant 168, and 8 parts dioctyl phthalate;

[0101] A method for preparing a water-blocking cable includes the following steps:

[0102] S1. A conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, and a water-blocking tape layer are sequentially arranged outside the conductor to obtain a semi-finished cable.

[0103] S2. Mix the components of the outer sheath layer, extrude them to cover the cable semi-finished product, and vulcanize at 180°C for 15 minutes to obtain a water-blocking cable.

[0104] Comparative Example 4

[0105] A water-blocking cable comprises, from the inside out, a conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, a water-blocking tape layer, and an outer sheath layer.

[0106] The outer sheath layer comprises the following components by weight: 18 parts tetrafluoroethylene propylene rubber, 45 parts chlorosulfonated polyethylene (chlorine content 43 wt%), 25 parts ethylene-butyl acrylate copolymer (butyl acrylate content 27 wt%), 30 parts talc, 2 parts BIPB vulcanizing agent, 1 part TMPTMA co-vulcanizing agent, 5 parts calcium zinc stabilizer, 8 parts maleic anhydride grafted polyethylene, 20 parts magnesium hydroxide, 1 part antioxidant 1010, 1 part antioxidant 168, and 8 parts dioctyl phthalate;

[0107] A method for preparing a water-blocking cable includes the following steps:

[0108] S1. A conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, and a water-blocking tape layer are sequentially arranged outside the conductor to obtain a semi-finished cable.

[0109] S2. Mix the components of the outer sheath layer, extrude them to cover the cable semi-finished product, and vulcanize at 180°C for 15 minutes to obtain a water-blocking cable.

[0110] Experimental Example 1

[0111] Impact resistance: The outer sheath of the water-blocking cables prepared in Examples 1-8 and Comparative Examples 1-4 were tested using a simple beam impact tester according to the method specified in GB / T 1043.2-2018 "Determination of impact properties of plastic simple beams - Part 2: Instrumented impact testing". The specimens were type 1 specimens with type A notches. The test results are shown in Table 1.

[0112] Table 1 Impact resistance test results

[0113]

[0114] By comparing the data from Examples 1-8 and Comparative Examples 1-2, it was found that Examples 1-6, which used a combination of chlorosulfonated polyethylene and ethylene-butyl acrylate copolymer, produced water-blocking cables with a notched impact strength greater than those in Comparative Examples 1-2. This indicates that the addition of ethylene-butyl acrylate copolymer and chlorosulfonated polyethylene improved the impact resistance of the water-blocking cable. By comparing the data from Examples 3-6 and Comparative Examples 3-4, it was found that Examples 3-6 improved the impact resistance of the water-blocking cable by optimizing the chlorine content in the chlorosulfonated polyethylene to 26wt%-35wt% and the butyl acrylate content in the ethylene-butyl acrylate copolymer to 27wt%-35wt%. Furthermore, when the chlorine content in the chlorosulfonated polyethylene was 35wt% and the butyl acrylate content in the ethylene-butyl acrylate copolymer was 27wt%, the impact resistance of the outer sheath of the water-blocking cable could be further improved.

[0115] By comparing the data of Example 6 and Examples 7-8, it was found that the notched impact strength of the outer sheath of the water-blocking cable made by adding composite filler in Examples 7-8 was greater than that in Example 6. This indicates that the impact resistance of the outer sheath of the water-blocking cable can be further improved by modifying the filler with 4,6-diamino-2-thiopyrimidine.

[0116] Experiment Example 2

[0117] Water resistance: The water absorption of the outer sheath of the water-resistant cables prepared in Examples 1-3 was tested according to the methods specified in GB / T 12706.1-2020 "General Test Methods for Insulation and Sheath Materials of Cables and Optical Fibers - Part 13: General Test Methods - Density Determination - Water Absorption Test - Shrinkage Test". The thickness of the sample was 0.9 mm, the length was 100 mm, and the width was 5 mm. The test results are shown in Table 2.

[0118] Table 2 Water resistance test results

[0119]

[0120] Based on the data in Table 2, the water absorption of the cable outer sheath prepared in Examples 1-3 is all less than 1 mg / m³.2 This indicates that the cable prepared by the present invention has good water resistance.

[0121] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A water-blocking cable, characterized by, From the inside out, it includes a conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, a water-blocking layer, and an outer sheath layer. The outer sheath layer comprises the following components by weight: 15-20 parts of tetrafluoroethylene propylene rubber, 40-50 parts of chlorosulfonated polyethylene, 20-30 parts of ethylene-butyl acrylate copolymer, 20-30 parts of filler, 1-3 parts of vulcanizing agent, 0.5-1.5 parts of co-vulcanizing agent, and 4-6 parts of stabilizer. The chlorosulfonated polyethylene has a chlorine content of 26wt%~35wt%; the ethylene-butyl acrylate copolymer has a butyl acrylate content of 27wt%~35wt%. The filler comprises inorganic powder and 4,6-diamino-2-thiopyrimidine; The method for preparing the filler includes the following steps: Inorganic powder was dispersed in a solvent, 4,6-diamino-2-thiopyrimidine hydrate was added, the mixture was stirred, concentrated, and dried to obtain the filler.

2. The water-blocking cable according to claim 1, characterized in that, The chlorosulfonated polyethylene contains 35 wt% chlorine; the ethylene-butyl acrylate copolymer contains 27 wt% butyl acrylate.

3. A water-blocking cable according to claim 1, characterized in that, The inorganic powder includes one or more of talc, diatomaceous earth, and kaolin.

4. A water-blocking cable according to claim 1, characterized in that, The mass ratio of the inorganic powder to the 4,6-diamino-2-thiopyrimidine hydrate is 50-60:

6.

5. A water-blocking cable according to claim 1, characterized in that, The stirring temperature is 60~70℃, and the stirring time is 3~4h.

6. A water-blocking cable according to claim 1, characterized in that, The outer sheath layer also includes the following components by weight: 4-10 parts compatibilizer, 15-24 parts flame retardant, 1-3 parts antioxidant, and 5-10 parts plasticizer.

7. A water-blocking cable according to claim 6, characterized in that, The compatibilizer includes maleic anhydride-grafted polyethylene; the flame retardant includes one or more of magnesium hydroxide, aluminum hydroxide, zinc borate, red phosphorus, and chlorinated paraffin; the antioxidant includes one or more of antioxidant 1010, antioxidant 1076, antioxidant 168, and antioxidant 3114; and the plasticizer includes one or two of dioctyl phthalate, diisooctyl adipate, and dioctyl sebacate.

8. A water-blocking cable according to claim 1, characterized in that, The vulcanizing agent includes any one of BIPB and DCP; the vulcanizing aid includes any one of TMPTMA and TAIC; and the stabilizer includes any one of calcium-zinc stabilizer and barium-zinc stabilizer.

9. A method for preparing a water-blocking cable, used to prepare the water-blocking cable according to any one of claims 1 to 8, characterized in that, Includes the following steps: S1. A conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, and a water-blocking layer are sequentially arranged outside the conductor to obtain a semi-finished cable. S2. Mix the components of the outer sheath layer, extrude them to cover the cable semi-finished product, and vulcanize them to obtain the water-blocking cable.

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