Preparation method of cable with pressure-resistant and wear-resistant functions

Abstract

The invention provides a cable with voltage-resistant and wear-resistant functions, and the raw materials of the cable comprise the following components in parts by weight: a conductor, an insulating layer coating the conductor, and a sheath layer coating the insulating layer from inside to outside in sequence, the insulating layer is prepared from low-density polyethylene and modified methyl vinyl silicone rubber; and the sheath layer is prepared from a modified fiber wear-resistant agent, nano composite powder and an ethylene-vinyl acetate copolymer. And excellent pressure-resistant and wear-resistant effects of the cable are realized through the insulating layer and the sheath layer.

Description

Technical Field

[0001] The invention belongs to the field of cable preparation, and specifically relates to a method for preparing a cable with pressure-resistant and wear-resistant functions. Background Art

[0002] Cables are an important part of power transmission, signal transmission, motors and electrical appliances. As an important electrical equipment, cables are widely used in power transmission, communications, construction, industrial automation and other fields. With the further development of society, cables often need to be bent during the installation of equipment power to meet different working scenarios, which puts higher requirements on the cable's pressure resistance and wear resistance.

[0003] Patent CN118366716B proposes a wear-resistant mining cable, whose main body consists of a rubber surface layer, a reinforcement layer, a wire body and a filling layer. The rubber surface layer includes an anti-wear rubber layer arranged on the outermost layer, and a connecting assembly is arranged on the outer side wall of the anti-wear rubber layer; the reinforcement layer includes three-sided reinforcement edges, and a braided reinforcement layer is arranged outside the three-sided reinforcement edges; the wire body includes a conductive wire and an insulating surface layer arranged on the surface of the conductive wire; the filling layer includes an elastic membrane arranged between the anti-wear rubber layer and the three-sided reinforcement edges, and a non-Newtonian liquid is arranged in the elastic membrane; through adhesive interlocking, the mutual combination of two adjacent mining cable bodies is achieved, and multiple cables are adhered into a whole to avoid the occurrence of friction damage caused by movement of the two cables.

[0004] Patent CN118412175B provides a production method for highly wear-resistant plastic insulated control cables. Through wire drawing and annealing treatment, the high conductivity of the conductor is ensured. The steam-crosslinked insulation layer and the soft inner lining layer provide excellent electrical insulation performance and mechanical protection. The armor layer and the highly wear-resistant plastic protective sleeve further enhance the mechanical strength and wear resistance of the cable. However, the service life, bending resistance and tear resistance are limited; after long-term use, the insulation layer of the cable is easily worn and broken, thereby destroying the insulation of the cable, which may affect the physical and electrical properties of the cable. Summary of the invention

[0005] The purpose of the present invention is to provide a method for preparing a cable with pressure-resistant and wear-resistant functions, wherein the insulation layer is prepared with low-density polyethylene and modified methyl vinyl silicone rubber, and the sheath layer is prepared with ethylene-vinyl acetate copolymer, modified fiber wear-resistant agent and nano-composite powder; the excellent pressure-resistant and wear-resistant effect of the cable is achieved through the insulation layer and the sheath layer.

[0006] In order to achieve the above object, the present invention provides the following technical solutions: A cable with pressure-resistant and wear-resistant functions, the raw materials of which include the following components in parts by weight, which include, from the inside to the outside, a conductor, an insulating layer coated on the outside of the conductor, and a sheath layer coated on the outside of the insulating layer; the insulating layer is made of low-density polyethylene and modified methyl vinyl silicone rubber; the sheath layer is made of modified fiber wear-resistant agent, nano-composite powder, and ethylene-vinyl acetate copolymer.

[0007] Preferably, the thickness of the sheath layer is 0.8-1.2 mm; the thickness of the insulation layer is 0.4-0.7 mm.

[0008] Preferably, the conductor is a copper monofilament or an aluminum monofilament.

[0009] Preferably, the insulating layer comprises the following components in parts by weight: 120-150 parts of low-density polyethylene, 30-45 parts of modified methyl vinyl silicone rubber, 8-11 parts of polyvinyl acetate, 4-6 parts of tributyl citrate and 3-6 parts of diisocyanate.

[0010] Preferably, the sheath layer comprises the following components in parts by weight: 60-100 parts of ethylene-vinyl acetate copolymer, 25-35 parts of modified fiber wear-resistant agent, 8-12 parts of nano-composite powder, 3-6 parts of stearic acid, 2-5 parts of antioxidant RD and 7-12 parts of polyimide.

[0011] The above-mentioned method for preparing a cable with pressure-resistant and wear-resistant functions comprises the following steps: S1: twisting the conductor to obtain a twisted conductor; S2: Preparation of modified methyl vinyl silicone rubber; S3: 120-150 parts of low-density polyethylene, 30-45 parts of modified methyl vinyl silicone rubber obtained in step S2, 8-11 parts of polyvinyl acetate, 4-6 parts of tributyl citrate and 3-6 parts of diisocyanate are mixed and kneaded, and then extruded and coated on the conductor twisted in step S1 to obtain an insulated wire core; S4: Preparation of modified fiber wear-resistant agent and nanocomposite powder; S5: Take 60-100 parts of ethylene-vinyl acetate copolymer, 25-35 parts of the modified fiber wear-resistant agent obtained in step S4, 8-12 parts of the nano-composite powder obtained in step S4, 3-6 parts of stearic acid, 2-5 parts of antioxidant RD and 7-12 parts of polyimide, mix and knead, extrude and coat on the insulating fiber core described in step S2 to obtain a cable with pressure-resistant and wear-resistant functions.

[0012] Preferably, the preparation process of the modified methyl vinyl silicone rubber in step S2 is: take 10-20 parts of nano-silicon dioxide and add it to 120-160 parts of water, and ultrasonically disperse it at a power of 800-1200W for 25-35min; then add 3-aminopropyltriethoxysilane, raise the temperature to 80-90°C, stir and react at a rate of 500-600r / min for 1.5-2.5h, and filter and take the precipitate for use; take 6-10 parts of the precipitate and add it to 40-60 parts of acetone, stir at a rate of 400-600r / min for 15-25min, then add 20-30 parts of methyl vinyl silicone rubber, raise the temperature to 90-110°C, and stir at a rate of 600-800r / min for 1.5-2.5h to obtain the modified methyl vinyl silicone rubber.

[0013] Preferably, the mixing temperature in step S3 is 140-160° C. and the mixing time is 15-20 min.

[0014] Preferably, the preparation process of the modified fiber wear resistant agent in step S4 is: take 10-20 parts of cellulose nanocrystals, 3-6 parts of carbon fibers, 25-35 parts of N,N-dimethylformamide, 2-5 parts of silane coupling agent KH570 and 40-60 parts of ethanol, mix them, stir and react at a temperature of 100-120°C for 1.5-2.5h, filter and dry to obtain the modified fiber wear resistant agent; the nano-composite powder is a composite of nano-silicon dioxide / nano-silicon carbide with a mass ratio of 1:1.5-2.

[0015] Preferably, the mixing temperature in step S4 is 120-140° C. and the mixing time is 20-25 min.

[0016] Compared with the prior art, the advantages and beneficial effects of the present invention are: In the preparation of the insulating layer, the present invention adopts nano-silicon dioxide modified methyl vinyl silicone rubber, and utilizes the durability and good dispersibility of nano-spherical silicon dioxide to promote better interface bonding between the methyl vinyl silicone rubber matrix, thereby improving the wear resistance and service life of the cable; at the same time, under the action of low-density polyethylene, modified methyl vinyl silicone rubber, polyvinyl acetate and other components, low-density polyethylene with excellent electrical insulation performance and modified methyl vinyl silicone rubber with small compression deformation are mixed and used to improve the pressure resistance and strength of the cable. In the preparation of the sheath layer, cellulose nanocrystals and carbon fibers are used to prepare modified fiber wear-resistant agents, and nano-composite powders are used to synergistically modify ethylene-vinyl acetate copolymers to improve the wear resistance and other properties of the cable outer layer. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] The raw materials used in the present invention are as follows: Methyl vinyl silicone rubber comes from Shanghai Yuanye Biotechnology Co., Ltd. with item number T22921; low-density polyethylene comes from Dongguan Shenghao Plastic Raw Materials Co., Ltd. with item number M1850A; polyvinyl acetate comes from Shanghai Saikerui Biotechnology Co., Ltd. with item number SRUS-1548032; tributyl citrate comes from Wuhan Shuer Biotechnology Co., Ltd. with item number 4179; diisocyanate comes from Shanghai Yuanye Biotechnology Co., Ltd. with item number S64423; cellulose nanocrystals come from Changzhou Lima Drying Engineering Co., Ltd. with item number 3909; carbon fiber comes from Dongguan Tongjin New Materials Co., Ltd. with item number 450CA30; silane coupling agent KH570 comes from Shanghai Yuanye Biotechnology Co., Ltd. with item number S15030; ethylene-vinyl acetate copolymer comes from Wuhan Xinxin Jiali Biotechnology Co., Ltd. with item number 5102; stearic acid comes from Shanghai Yuanye Biotechnology Co., Ltd. with item number S30473; antioxidant RD comes from Shanghai Yuanye Biotechnology Co., Ltd. with item number S97687; polyimide comes from Shanghai Yuanye Biotechnology Co., Ltd. with item number T25305.

[0019] Example 1 This embodiment provides a method for preparing a cable with pressure-resistant and wear-resistant functions, comprising the following steps: S1: twisting the conductor to obtain a twisted conductor; S2: Take 10g of nano-silicon dioxide with a particle size of 20nm and add it to 120g of water, and ultrasonically disperse it at a power of 800W for 25min; then add 3-aminopropyltriethoxysilane, raise the temperature to 80℃, stir at a rate of 500r / min for 1.5h, and filter the precipitate for use; take 6g of the precipitate and add it to 40g of acetone, stir at a rate of 400r / min for 15min, then add 20g of methyl vinyl silicone rubber, raise the temperature to 90℃, and stir at a rate of 600r / min for 1.5h to obtain modified methyl vinyl silicone rubber; S3: 120 g of low-density polyethylene, 30 g of the modified methyl vinyl silicone rubber obtained in step S2, 8 g of polyvinyl acetate, 4 g of tributyl citrate and 3 g of diisocyanate are mixed, kneaded at a temperature of 140° C. for 15 min, and then extruded and coated on the conductor twisted in step S1 to obtain an insulated wire core; S4: 10g of cellulose nanocrystals, 3g of carbon fiber, 25g of N,N-dimethylformamide, 2g of silane coupling agent KH570 and 40g of ethanol were mixed, stirred and reacted at a temperature of 100°C for 1.5h, filtered and dried to obtain the modified fiber wear-resistant agent; the nano-composite powder of nano-silicon dioxide / nano-silicon carbide in a mass ratio of 1:1.5 was added; S5: Take 60g of ethylene-vinyl acetate copolymer, 25g of the modified fiber wear-resistant agent obtained in step S4, 8g of the nano-composite powder obtained in step S4, 3g of stearic acid, 2g of antioxidant RD and 7g of polyimide, mix them, and knead them at a temperature of 120°C for 20min. After extrusion, coat them on the insulating fiber core described in step S2 to obtain a cable with pressure-resistant and wear-resistant functions.

[0020] Example 2 This embodiment provides a method for preparing a cable with pressure-resistant and wear-resistant functions, comprising the following steps: S1: twisting the conductor to obtain a twisted conductor; S2: Take 20g of nano-silicon dioxide and add it to 160g of water, and ultrasonically disperse it at a power of 1200W for 35min; then add 3-aminopropyltriethoxysilane, raise the temperature to 90℃, stir at a rate of 600r / min for 2.5h, and filter the precipitate for use; take 10g of the precipitate and add it to 60g of acetone, stir at a rate of 600r / min for 25min, then add 30g of methyl vinyl silicone rubber, raise the temperature to 110℃, and stir at a rate of 800r / min for 2.5h to obtain modified methyl vinyl silicone rubber; S3: 150 g of low-density polyethylene, 45 g of the modified methyl vinyl silicone rubber obtained in step S2, 11 g of polyvinyl acetate, 6 g of tributyl citrate and 6 g of diisocyanate are mixed, kneaded at a temperature of 160° C. for 20 min, and then extruded and coated on the conductor twisted in step S1 to obtain an insulated wire core; S4: 20g of cellulose nanocrystals, 6g of carbon fiber, 35g of N,N-dimethylformamide, 5g of silane coupling agent KH570 and 60g of ethanol were mixed, stirred and reacted at a temperature of 120°C for 2.5h, filtered and dried to obtain the modified fiber wear-resistant agent; the nano-composite powder of nano-silicon dioxide / nano-silicon carbide in a mass ratio of 1:2 was added; S5: Take 100g of ethylene-vinyl acetate copolymer, 35g of the modified fiber wear-resistant agent obtained in step S4, 12g of the nano-composite powder obtained in step S4, 6g of stearic acid, 5g of antioxidant RD and 12g of polyimide, mix them, and knead them at a temperature of 140°C for 25min. After extrusion, coat them on the insulating fiber core described in step S2 to obtain a cable with pressure-resistant and wear-resistant functions.

[0021] Example 3 This embodiment provides a method for preparing a cable with pressure-resistant and wear-resistant functions, comprising the following steps: S1: twisting the conductor to obtain a twisted conductor; S2: Take 15g of nano-silicon dioxide and add it to 140g of water, and ultrasonically disperse it at a power of 1000W for 30min; then add 3-aminopropyltriethoxysilane, raise the temperature to 85℃, stir at a rate of 550r / min for 2h, filter and take the precipitate for use; take 8g of the precipitate and add it to 50g of acetone, stir at a rate of 550r / min for 22min, then add 25g of methyl vinyl silicone rubber, raise the temperature to 100℃, and stir at a rate of 700r / min for 2h to obtain modified methyl vinyl silicone rubber; S3: 140 g of low-density polyethylene, 40 g of the modified methyl vinyl silicone rubber obtained in step S2, 10 g of polyvinyl acetate, 5 g of tributyl citrate and 5 g of diisocyanate are mixed, kneaded at a temperature of 150° C. for 18 min, and then extruded and coated on the conductor twisted in step S1 to obtain an insulated wire core; S4: 15g of cellulose nanocrystals, 5g of carbon fiber, 30g of N,N-dimethylformamide, 4g of silane coupling agent KH570 and 55g of ethanol were mixed, stirred and reacted at a temperature of 110°C for 2h, filtered and dried to obtain the modified fiber wear-resistant agent; the nano-composite powder of nano-silicon dioxide / nano-silicon carbide in a mass ratio of 1:1.7 was added; S5: Take 85g of ethylene-vinyl acetate copolymer, 32g of the modified fiber wear-resistant agent obtained in step S4, 10g of the nano-composite powder obtained in step S4, 5g of stearic acid, 4g of antioxidant RD and 10g of polyimide, mix them, and knead them at a temperature of 130°C for 23min. After extrusion, coat them on the insulating fiber core described in step S2 to obtain a cable with pressure-resistant and wear-resistant functions.

[0022] Comparative Example 1 The difference between this comparative example and Example 1 is that step S2 is missing, that is, the methyl vinyl silicone rubber is not modified, and unmodified methyl vinyl silicone rubber is directly used in step S3, and the other steps are the same.

[0023] Comparative Example 2 The difference between this comparative example and Example 1 is that low-density polyethylene is missing in step S3, and the other steps are the same.

[0024] Comparative Example 3 The difference between this comparative example and Example 1 is that methyl vinyl silicone rubber is missing in step S3, and the other steps are the same.

[0025] Comparative Example 4 The difference between this comparative example and Example 1 is that diisocyanate is missing in step S3, and the other steps are the same.

[0026] Comparative Example 5 The difference between this comparative example and Example 1 is that the modified fiber wear-resistant agent is missing in step S4, and the other steps are the same.

[0027] Comparative Example 6 The difference between this comparative example and Example 1 is that the nanocomposite powder is missing in step S5, and the other steps are the same.

[0028] Performance Test: The tensile strength and elongation at break were tested according to GB / T2951-2008; the wear resistance was tested according to GB / T5013-2008; and the pressure resistance was tested according to GB / T11017.1.

[0029] The results are as follows: Table 1

[0030] It can be seen from the above performance test results that Examples 1-3 have excellent performance in terms of tensile strength, elongation at break and pressure resistance. In particular, the comprehensive performance of Example 3 is the most outstanding. However, since Comparative Examples 1-6 do not adopt the necessary technical solutions, their corresponding performance tests are significantly worse than those of the Examples. The above experimental results further prove the importance of the technical solutions defined in the present invention for its technical effects.

[0031] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A cable with pressure-resistant and wear-resistant functions, characterized in that: The raw materials include the following components in parts by weight, which include, from the inside to the outside, a conductor, an insulating layer wrapped around the conductor, and a sheath layer wrapped around the insulating layer; the insulating layer is made of low-density polyethylene and modified methyl vinyl silicone rubber; the sheath layer is made of modified fiber wear-resistant agent, nano-composite powder, and ethylene-vinyl acetate copolymer.

2. A cable with pressure-resistant and wear-resistant functions according to claim 1, characterized in that: The thickness of the sheath layer is 0.8-1.2 mm; the thickness of the insulation layer is 0.4-0.7 mm.

3. A cable with pressure-resistant and wear-resistant functions according to claim 1, characterized in that: The conductor is a copper monofilament or an aluminum monofilament.

4. A cable with pressure-resistant and wear-resistant functions according to claim 1, characterized in that: The insulating layer comprises the following components in parts by weight: 120-150 parts of low-density polyethylene, 30-45 parts of modified methyl vinyl silicone rubber, 8-11 parts of polyvinyl acetate, 4-6 parts of tributyl citrate and 3-6 parts of diisocyanate.

5. The cable with pressure-resistant and wear-resistant function according to claim 1, characterized in that: The sheath layer comprises the following components in parts by weight: 60-100 parts of ethylene-vinyl acetate copolymer, 25-35 parts of modified fiber wear-resistant agent, 8-12 parts of nano composite powder, 3-6 parts of stearic acid, 2-5 parts of antioxidant RD and 7-12 parts of polyimide.

6. A method for preparing a cable with pressure-resistant and wear-resistant functions, characterized in that: The steps include: S1: twisting the conductor to obtain a twisted conductor; S2: Preparation of modified methyl vinyl silicone rubber; S3: 120-150 parts of low-density polyethylene, 30-45 parts of modified methyl vinyl silicone rubber obtained in step S2, 8-11 parts of polyvinyl acetate, 4-6 parts of tributyl citrate and 3-6 parts of diisocyanate are mixed and kneaded, and then extruded and coated on the conductor twisted in step S1 to obtain an insulated wire core; S4: Preparation of modified fiber wear-resistant agent and nanocomposite powder; S5: Take 60-100 parts of ethylene-vinyl acetate copolymer, 25-35 parts of the modified fiber wear-resistant agent obtained in step S4, 8-12 parts of the nano-composite powder obtained in step S4, 3-6 parts of stearic acid, 2-5 parts of antioxidant RD and 7-12 parts of polyimide, mix and knead, extrude and coat on the insulating fiber core described in step S2 to obtain a cable with pressure-resistant and wear-resistant functions.

7. A method for preparing a cable with pressure-resistant and wear-resistant functions according to claim 1, characterized in that: The preparation process of the modified methyl vinyl silicone rubber in step S2 is as follows: 10-20 parts of nano-silicon dioxide are added to 120-160 parts of water, and ultrasonically dispersed at a power of 800-1200W for 25-35min; then 3-aminopropyltriethoxysilane is added, the temperature is raised to 80-90°C, and the reaction is stirred at a rate of 500-600r / min for 1.5-2.5h, and the precipitate is filtered for standby use; 6-10 parts of the precipitate are added to 40-60 parts of acetone, and stirred at a rate of 400-600r / min for 15-25min, and then 20-30 parts of methyl vinyl silicone rubber are added, the temperature is raised to 90-110°C, and the reaction is stirred at a rate of 600-800r / min for 1.5-2.5h to obtain the modified methyl vinyl silicone rubber.

8. The method for preparing a cable with pressure-resistant and wear-resistant functions according to claim 1, characterized in that: The mixing temperature in step S3 is 140-160° C. and the mixing time is 15-20 min.

9. A method for preparing a cable with pressure-resistant and wear-resistant functions according to claim 1, characterized in that: The preparation process of the modified fiber wear resistant agent in step S4 is as follows: 10-20 parts of cellulose nanocrystals, 3-6 parts of carbon fibers, 25-35 parts of N,N-dimethylformamide, 2-5 parts of silane coupling agent KH570 and 40-60 parts of ethanol are mixed, stirred and reacted at a temperature of 100-120° C. for 1.5-2.5 hours, and filtered and dried to obtain the modified fiber wear resistant agent; the nano-composite powder is a nano-silicon dioxide / nano-silicon carbide composite with a mass ratio of 1:1.5-2.

10. The method for preparing a cable with pressure-resistant and wear-resistant functions according to claim 1, characterized in that: The mixing temperature in step S4 is 120-140° C. and the mixing time is 20-25 min.

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