Radiation resistant cable, method of making and use in robots

Abstract

The application relates to the technical field of high polymer materials, and discloses a radiation-resistant cable, a preparation method thereof and application of the cable in robots. The radiation-resistant cable comprises a wire core, an insulation layer, a shielding layer and a protective layer arranged in sequence from inside to outside, and the protective layer comprises the following components in parts by weight: 90-120 parts of a base resin, and 10-20 parts of a phenol-containing polymer; wherein the phenol-containing polymer is obtained by polymerization of 2,4-diaminophenol, 4-aminocyclohexane carboxylic acid and sebacic acid in a molar ratio of 2:(0.5-2):(1-3); and the base resin comprises polyethylene resin and polyvinyl chloride resin. The phenol-containing polymer obtained by polymerization of 2,4-diaminophenol, 4-aminocyclohexane carboxylic acid and sebacic acid in a specific ratio is used, the radiation resistance of the protective layer with the polyethylene resin and the polyvinyl chloride resin as the base resin is improved, and therefore the cable prepared by using the protective layer has the radiation resistance.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and more specifically, to a radiation-resistant cable, its preparation method, and its application in robots. Background Technology

[0002] The main components of a robot's structure include mechanical structure, drive system, perception system, control system, end effector, energy system, and interaction system. Cables are the key medium for power and signal transmission in robots, serving as a connection medium to link the robot's mechanical structure, drive system, perception system, control system, end effector, energy system, and interaction system, enabling the robot to complete various commands.

[0003] A cable, from the inside out, consists of a conductor, an insulation layer, a shielding layer, and a protective layer. The protective layer, as the outermost layer, often needs to possess properties such as abrasion resistance and radiation resistance to adapt to different operating environments. In some extreme environments, such as those in the nuclear industry, aerospace, and medical equipment fields, robots may be exposed to high-energy rays or radiation. Therefore, cables with radiation-resistant properties are used, meaning the cable's protective layer must have radiation-resistant properties to improve the robot's reliability and safety. Furthermore, polyethylene resin and polyvinyl chloride resin are used as the base resins for the protective layer due to their excellent insulation properties.

[0004] Therefore, it is of great significance to develop a radiation-resistant cable with polyethylene resin and polyvinyl chloride resin as the protective layer matrix resin and the protective layer having radiation resistance properties. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a radiation-resistant cable, its preparation method, and its application in robots.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] In a first aspect, the present invention provides a radiation-resistant cable, comprising, from the inside out, a conductor, an insulation layer, a shielding layer, and a protective layer, wherein the protective layer comprises the following components in parts by weight:

[0008] 90-120 parts matrix resin, 10-20 parts phenol-containing polymer;

[0009] The phenol-containing polymer is obtained by polymerization of 2,4-diaminophenol, 4-aminocyclohexanecarboxylic acid and sebacic acid in a molar ratio of 2:(0.5-2):(1-3).

[0010] The matrix resin includes polyethylene resin and polyvinyl chloride resin.

[0011] This invention improves the radiation resistance of the protective layer based on polyethylene resin and polyvinyl chloride resin by using a phenol-containing polymer obtained by polymerizing 2,4-diaminophenol, 4-aminocyclohexanecarboxylic acid and sebacic acid in a specific ratio. As a result, the cable made using this protective layer has radiation resistance, thus obtaining a radiation-resistant cable.

[0012] Specifically, in the phenol-containing polymer, 2,4-diaminophenol provides the phenol structure, which can reduce the degradation effect of radiation on the material by capturing free radicals, thereby improving the radiation resistance of the protective layer. The phenol-containing polymer obtained by polymerizing 2,4-diaminophenol, 4-aminocyclohexanecarboxylic acid, and sebacic acid has a network structure, which can stably and uniformly fix the phenol structure, which is beneficial to improving the radiation resistance of the protective layer. At the same time, the chain segments provided by 4-aminocyclohexanecarboxylic acid and sebacic acid with different flexibility can improve the compatibility between the network structure of the phenol-containing polymer and the matrix resin, which is beneficial to the uniform dispersion of the phenol-containing polymer in the matrix resin, thereby improving the radiation resistance of the protective layer.

[0013] In addition, the use of phenolic polymers in a mesh structure can improve the wear resistance and corrosion resistance of the protective layer.

[0014] Preferably, the molar ratio of 2,4-diaminophenol, 4-aminocyclohexanecarboxylic acid, and sebacic acid is one or any two of the following: 2:0.5:1, 2:0.5:1.5, 2:0.5:2, 2:0.5:2.5, 2:0.5:3, 2:1:1, 2:1:1.5, 2:1:2, 2:1:2.5, 2:1:3, 2:1.5:1, 2:1.5:1.5, 2:1.5:2, 2:1.5:2.5, 2:1.5:3, 2:2:1, 2:2:1.5, 2:2:2, 2:2:2.5, and 2:2:3.

[0015] Preferably, the molar ratio of 2,4-diaminophenol, 4-aminocyclohexanecarboxylic acid and sebacic acid is 2:(0.5-1.5):(2-3).

[0016] Preferably, the preparation method of the phenol-containing polymer is as follows: under the action of a catalyst, 2,4-diaminophenol, 4-aminocyclohexanecarboxylic acid and sebacic acid are polymerized through a condensation reaction to obtain the phenol-containing polymer.

[0017] Catalysts applicable to the polymerization of 2,4-diaminophenol, 4-aminocyclohexanecarboxylic acid, and sebacic acid via condensation reactions are all suitable for use in this invention. For example, the catalyst may include at least one of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC·HCl), N-hydroxysuccinimide (NHS), dicyclohexylcarbodiimide (DCC), diisopropylcarbodiimide (DIC), and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide (EDCI). When the catalyst is 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC·HCl) or N-hydroxysuccinimide (NHS), the molar ratio of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC·HCl) to N-hydroxysuccinimide (NHS) is 1:(0.4-1.5).

[0018] More preferably, the molar ratio of the catalyst to sebacic acid is 1:(0.5-2).

[0019] Preferably, the polymerization reaction temperature is 15-65℃ and the reaction time is 0.5-24h.

[0020] Preferably, the weight ratio of the polyethylene resin and the polyvinyl chloride resin is one or any two of the following: 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1, 1:1.1, 1:1.2, 1:1.3, 1:1.4, 1:1.5, 1:1.6, 1:1.7, 1:1.8, 1:1.9, and 1:2.

[0021] More preferably, the weight ratio of the polyethylene resin to the polyvinyl chloride resin is 1:(0.5-2).

[0022] Preferably, the polyethylene resin is at least one of low-density polyethylene (LDPE), high-density polyethylene (HDPE), and linear low-density polyethylene (LLDPE).

[0023] Preferably, the melt flow rate (MFR) of the polyethylene resin at 190°C and 2.16 kg load is one or any two of the following: 1 g / 10 min, 1.5 g / 10 min, 2 g / 10 min, 2.5 g / 10 min, 3 g / 10 min, 3.5 g / 10 min, 4 g / 10 min, 4.5 g / 10 min, 5 g / 10 min, 5.5 g / 10 min, 6 g / 10 min, 6.5 g / 10 min, 7 g / 10 min, 7.5 g / 10 min, 8 g / 10 min, 8.5 g / 10 min, and 9 g / 10 min.

[0024] More preferably, the melt flow rate (MFR) of the polyethylene resin at 190°C and 2.16 kg load is 1-9 g / 10 min.

[0025] More preferably, the melt flow rate (MFR) of the polyethylene resin at 190°C and 2.16 kg load is 2-8 g / 10 min, specifically 2-4 g / 10 min.

[0026] In this invention, the melt flow rate of the polyethylene resin at 190°C and 2.16 kg load was measured according to the ISO 1133-2019 standard.

[0027] Preferably, the degree of polymerization of the polyvinyl chloride resin is a range of one or any two of the following: 600, 650, 700, 750, 800, 850, 900, 950, 1000, 1050, 1100, 1150, 1200, 1250, 1300, 1350, 1400, 1450, 1500, 1550, 1600, 1650, 1700, 1750, 1800, 1850, and 1900.

[0028] More preferably, the degree of polymerization of the polyvinyl chloride resin is 600-1900.

[0029] More preferably, the degree of polymerization of the polyvinyl chloride resin is 700-1800, specifically 700-1000.

[0030] In this invention, the degree of polymerization of the polyvinyl chloride resin is measured according to the GB / T5761-2006 standard "Suspension Method General Purpose Polyvinyl Chloride Resin".

[0031] Preferably, the protective layer further includes at least one of filler, plasticizer, lubricant, and stabilizer.

[0032] More preferably, the filler includes at least one of silicon carbide (SiC), talc, boron nitride (BN), graphite, diatomaceous earth, and kaolin.

[0033] This invention utilizes fillers to facilitate the movement of the phenol-containing polymer with a network structure within the matrix resin, allowing for more uniform dispersion of the phenol-containing polymer and thus further improving the radiation resistance of the protective layer. Simultaneously, the use of fillers also helps to further enhance the wear resistance and corrosion resistance of the protective layer.

[0034] More preferably, the filler comprises silicon carbide and talc in a weight ratio of 1:(0.5-1.5).

[0035] More preferably, the weight ratio of silicon carbide to talc is one or any two of the following: 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1, 1:1.1, 1:1.2, 1:1.3, 1:1.4, 1:1.5.

[0036] More preferably, the average particle size of the silicon carbide is 100-300 nm.

[0037] More preferably, the average particle size of the silicon carbide is a range of one or any two of the following: 100nm, 120nm, 150nm, 170nm, 200nm, 220nm, 250nm, 270nm, and 300nm.

[0038] The average particle size of silicon carbide described in this invention was measured using a Malvern Mastersizer 3000 laser particle size analyzer according to the GB / T29022-2012 standard "Dynamic Light Scattering Method (DLS) for Particle Size Analysis".

[0039] More preferably, the talc powder has a mesh size of 2000-8000 mesh.

[0040] More preferably, the talc powder has a mesh size of one or any two of the following: 2000 mesh, 2500 mesh, 3000 mesh, 3500 mesh, 4000 mesh, 4500 mesh, 5000 mesh, 5500 mesh, 6000 mesh, 6500 mesh, 7000 mesh, 7500 mesh, and 8000 mesh.

[0041] More preferably, the weight of the filler is one or any two of the following: 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, and 20 parts.

[0042] More preferably, the filler is 10-20 parts by weight.

[0043] Commonly used plasticizers in this field can be used in this invention. For example, the plasticizer is at least one of dioctyl adipate (DOA), dioctyl sebacate, di-n-hexyl sebacate (DHS), tributyl citrate (TBC), and acetylated tributyl citrate (ATBC).

[0044] More preferably, the plasticizer is in the range of one or both of the following weight parts: 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, and 10 parts.

[0045] More preferably, the plasticizer is present in 3-10 parts by weight.

[0046] Commonly used lubricants in this field can be used in this invention. For example, the lubricant is at least one of polyethylene wax, stearic acid, and pentaerythritol stearate.

[0047] More preferably, the weight parts of the lubricant are one or any two of the following: 1 part, 1.2 parts, 1.5 parts, 1.7 parts, 1.8 parts, 2 parts, 2.2 parts, 2.5 parts, 2.7 parts, 2.8 parts, 3 parts, 3.2 parts, 3.5 parts, 3.7 parts, 3.8 parts, and 4 parts.

[0048] More preferably, the lubricant is present in 1-4 parts by weight.

[0049] Stabilizers commonly used in this field can be used in this invention. For example, the stabilizer is at least one of calcium-zinc stabilizers and calcium stearate. The calcium-zinc stabilizers include, but are not limited to, at least one of calcium-zinc heat stabilizer CZ-116 and calcium-zinc heat stabilizer CZ-113.

[0050] More preferably, the stabilizer is in the range of one or any two of the following weight parts: 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, 1 part, 1.1 parts, 1.2 parts, 1.3 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.7 parts, 1.8 parts, 1.9 parts, and 2 parts.

[0051] More preferably, the stabilizer is present in 0.5-2 parts by weight.

[0052] Preferably, the weight parts of the matrix resin are one or any two of the following: 90 parts, 92 parts, 95 parts, 97 parts, 100 parts, 102 parts, 105 parts, 107 parts, 110 parts, 112 parts, 115 parts, 117 parts, and 120 parts; and the weight parts of the phenol-containing polymer are one or any two of the following: 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, and 20 parts.

[0053] Preferably, the core material is one of pure copper, pure aluminum, copper alloy, and magnesium alloy.

[0054] Preferably, the insulating layer comprises at least one of polyethylene and polyvinyl chloride.

[0055] Preferably, the shielding layer includes at least one of copper strip and aluminum strip.

[0056] Secondly, the present invention provides a method for preparing a radiation-resistant cable, comprising the following steps:

[0057] S1. Extruding the raw material of the insulation layer onto the surface of the wire core to obtain a wire core covered with an insulation layer;

[0058] S2. Wrap the wire core covered with the shielding layer material to obtain a wire core covered with a shielding layer;

[0059] S3. Extrude the raw material of the protective layer onto the surface of the wire core covered with the shielding layer to obtain the radiation-resistant cable.

[0060] Thirdly, the present invention provides an application of radiation-resistant cable in robots.

[0061] Preferably, the application is the use of radiation-resistant cables in the manufacture of robots.

[0062] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0063] This invention improves the radiation resistance of the protective layer based on polyethylene resin and polyvinyl chloride resin by using a phenol-containing polymer obtained by polymerizing 2,4-diaminophenol, 4-aminocyclohexanecarboxylic acid and sebacic acid in a specific ratio. As a result, the cable made using this protective layer has radiation resistance, thus obtaining a radiation-resistant cable.

[0064] Specifically, in the phenol-containing polymer, 2,4-diaminophenol provides the phenol structure, which can reduce the degradation effect of radiation on the material by capturing free radicals, thereby improving the radiation resistance of the protective layer. The phenol-containing polymer obtained by polymerizing 2,4-diaminophenol, 4-aminocyclohexanecarboxylic acid, and sebacic acid has a network structure, which can stably and uniformly fix the phenol structure, which is beneficial to improving the radiation resistance of the protective layer. At the same time, the chain segments provided by 4-aminocyclohexanecarboxylic acid and sebacic acid with different flexibility can improve the compatibility between the network structure of the phenol-containing polymer and the matrix resin, which is beneficial to the uniform dispersion of the phenol-containing polymer in the matrix resin, thereby improving the radiation resistance of the protective layer.

[0065] In addition, the use of phenolic polymers in a mesh structure can improve the wear resistance and corrosion resistance of the protective layer.

[0066] This invention utilizes fillers to facilitate the movement of the phenol-containing polymer with a network structure within the matrix resin, allowing for more uniform dispersion of the phenol-containing polymer and thus further improving the radiation resistance of the protective layer. Simultaneously, the use of fillers also helps to further enhance the wear resistance and corrosion resistance of the protective layer. Detailed Implementation

[0067] To better illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0068] The experimental methods in the following examples and comparative examples, where specific conditions are not specified, are generally performed under conventional conditions in the art or as recommended by the manufacturer; the raw materials and reagents used, unless otherwise specified, are all commercially available from the conventional market.

[0069] The reagents used in the various embodiments and comparative examples of this invention are as follows:

[0070] Polyethylene resin-1 (PE-1), low-density polyethylene, LDPE 2426K, CNOOC Shell, melt flow rate (MFR) of 4 g / 10 min at 190℃ and 2.16 kg load;

[0071] Polyethylene resin-2 (PE-2), low-density polyethylene, LDPE 2420D, CNOOC Shell, melt flow rate (MFR) of 2 g / 10 min at 190℃ and 2.16 kg load;

[0072] Polyethylene resin-3 (PE-3), low-density polyethylene, LDPE 722, Dow Chemical, USA, has a melt flow rate (MFR) of 8 g / 10 min at 190°C and 2.16 kg load.

[0073] Polyethylene resin-4 (PE-4), high-density polyethylene, HDPE 4804, DELTAPOLYMERS, has a melt flow rate (MFR) of 5 g / 10 min at 190°C and 2.16 kg load.

[0074] Polyvinyl chloride resin-1 (PVC-1), PVC TL-1000, LG Korea, degree of polymerization 1000;

[0075] Polyvinyl chloride resin-2 (PVC-2), PVC TK-700, Shin-Etsu Chemicals, Japan, degree of polymerization 700;

[0076] Polyvinyl chloride resin-3 (PVC-3), PVC S-80, Formosa Plastics Industrial (Ningbo) Co., Ltd., degree of polymerization 1800;

[0077] Silicon carbide-1, with an average particle size of 200 nm, was obtained by crushing S888679 produced by Shanghai Maclean.

[0078] Silicon carbide-2, with an average particle size of 100 nm, was obtained by crushing S888679 produced by Shanghai Maclean.

[0079] Silicon carbide-3, with an average particle size of 300 nm, was obtained by crushing S888679 produced by Shanghai Maclean.

[0080] Talc-1, 3000 mesh, T823197, Shanghai Maclean's;

[0081] Talc-2, 8000 mesh, T875086, Shanghai Maclean's;

[0082] Talc-3, 2000 mesh, T823196, Shanghai Maclean's;

[0083] Kaolin, 3000 mesh, K100132, Shanghai Aladdin;

[0084] Plasticizer, dioctyl adipate (DOA), commercially available;

[0085] Lubricant, stearic acid, commercially available;

[0086] Stabilizer, calcium stearate, commercially available;

[0087] In this invention, the melt flow rate of the polyethylene resin at 190°C and 2.16 kg load was measured according to ISO 1133-2019 standard;

[0088] In this invention, the degree of polymerization of the polyvinyl chloride resin is measured according to the GB / T5761-2006 standard "Suspension Method General Purpose Polyvinyl Chloride Resins";

[0089] The average particle size of silicon carbide described in this invention was measured using a Malvern Mastersizer 3000 laser particle size analyzer according to the GB / T29022-2012 standard "Dynamic Light Scattering Method (DLS) for Particle Size Analysis".

[0090] Example 1

[0091] This embodiment provides a radiation-resistant cable, comprising, from the inside out, a conductor, an insulation layer, a shielding layer, and a protective layer, wherein the protective layer comprises the following components in parts by weight:

[0092] 100 parts matrix resin, 15 parts phenol-containing polymer, 15 parts filler, 6 parts plasticizer, 2 parts lubricant, 1 part stabilizer;

[0093] The preparation method of the phenol-containing polymer is as follows: sebacic acid is added to ethanol and stirred to dissolve. Then, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC·HCl) and N-hydroxysuccinimide (NHS) are added to activate the carboxyl groups for 15 min. Then, 2,4-diaminophenol and 4-aminocyclohexanecarboxylic acid are added and reacted at 50°C for 8 h, that is, polymerization is carried out through condensation reaction. The EDC·HCl and NHS are removed by dialysis using a dialysis bag (molecular weight cutoff 200D). The polymer is then freeze-dried to obtain the phenol-containing polymer.

[0094] In the above method for preparing phenol-containing polymers, the molar ratio of 2,4-diaminophenol, 4-aminocyclohexanecarboxylic acid and sebacic acid is 2:1.5:2, the molar ratio of EDC·HCl and NHS is 1:1, and the molar ratio of catalyst (EDC·HCl and NHS) to sebacic acid is 1:1.

[0095] The matrix resin is a mixture of polyethylene resin-1 (PE-1) and polyvinyl chloride resin-1 (PVC-1) in a weight ratio of 1:1.

[0096] The filler is silicon carbide-1 and talc-1 in a weight ratio of 1:1;

[0097] The preparation method of the above-mentioned radiation-resistant cable includes the following steps:

[0098] S1. At 200°C, the raw material of the insulation layer (polyvinyl chloride resin-1) is extruded onto the surface of the wire core (made of pure copper) to obtain a wire core covered with an insulation layer;

[0099] S2. Wrap the wire core covered with the insulating layer with the raw material of the shielding layer (copper strip) to obtain the wire core covered with the shielding layer;

[0100] S3. Mix the above-mentioned protective layer raw materials, and then at 200°C, extrude the mixed protective layer raw materials onto the surface of the wire core covered with the shielding layer to obtain a radiation-resistant cable.

[0101] Examples 2-5 and Comparative Examples 1-6

[0102] Examples 2-5 and Comparative Examples 1-6 provide different radiation-resistant cables. The difference between them and Example 1 lies in the molar ratio of 2,4-diaminophenol, 4-aminocyclohexanecarboxylic acid, and sebacic acid in the preparation of the phenol-containing polymer in the protective layer. The rest are the same as in Example 1, as shown in the table below:

[0103] Table 1. Molar ratios of 2,4-diaminophenol, 4-aminocyclohexanecarboxylic acid, and sebacic acid in Examples 1-5 and Comparative Examples 1-6

[0104]

[0105]

[0106] Comparative Example 7

[0107] This comparative example provides a radiation-resistant cable, which differs from Example 1 in that the phenol-containing polymer in the protective layer is prepared by replacing sebacic acid with succinic acid, that is, the molar ratio of 2,4-diaminophenol, 4-aminocyclohexanecarboxylic acid and succinic acid is 2:1.5:2, and the rest is the same as Example 1.

[0108] Examples 6-7

[0109] Examples 6-7 provide different radiation-resistant cables, differing from Example 1 in the weight ratio of polyethylene resin-1 (PE-1) and polyvinyl chloride resin-1 (PVC-1) in the protective layer. All other aspects are identical to Example 1, as detailed in the table below:

[0110] Table 2 shows the weight ratio of polyethylene resin-1 and polyvinyl chloride resin-1 in Examples 1, 6-7.

[0111]

[0112] Examples 8-10

[0113] Examples 8-10 provide different radiation-resistant cables, differing from Example 1 in the type of polyethylene resin in the protective layer; otherwise, they are identical to Example 1, as detailed in the table below:

[0114] Table 3. Types of polyethylene resins in Examples 1, 8-10

[0115]

[0116]

[0117] Examples 11-12

[0118] Examples 11-12 provide different radiation-resistant cables, differing from Example 1 in the type of polyvinyl chloride resin in the protective layer; otherwise, they are identical to Example 1, as detailed in the table below:

[0119] Table 4. Types of polyvinyl chloride resins in Examples 1 and 11-12

[0120] Example 1 Polyvinyl chloride resin-1 Example 11 Polyvinyl chloride resin-2 Example 12 Polyvinyl chloride resin-3

[0121] Examples 13-14

[0122] Examples 13-14 provide different radiation-resistant cables, differing from Example 1 in the weight ratio of silicon carbide-1 and talc-1 in the protective layer; otherwise, they are identical to Example 1, as detailed in the table below:

[0123] Table 5. Weight ratio of silicon carbide-1 and talc-1 in Examples 1, 13-14

[0124] Example 1 1:1 Example 13 1:0.5 Example 14 1:1.5

[0125] Examples 15-16

[0126] Examples 15-16 provide different radiation-resistant cables, differing from Example 1 in the type of silicon carbide in the protective layer; otherwise, they are identical to Example 1, as detailed in the table below:

[0127] Table 6. Types of Silicon Carbide in Examples 1, 15-16

[0128] Example 1 Silicon carbide-1 Example 15 Silicon carbide-2 Example 16 Silicon carbide-3

[0129] Examples 17-18

[0130] Examples 17-18 provide different radiation-resistant cables, differing from Example 1 in the type of talc powder in the protective layer; otherwise, they are identical to Example 1, as detailed in the table below:

[0131] Table 7. Types of talc powder in Examples 1 and 17-18

[0132] Example 1 Talc-1 Example 17 Talc-2 Example 18 Talc-3 Example 19 Kaolin

[0133] Note: The type of talc powder in Example 19 is "kaolin," which means that kaolin was used instead of talc powder in the experiment.

[0134] Example 20

[0135] This embodiment provides a radiation-resistant cable, which differs from Embodiment 1 in that the protective layer contains only the base resin and a phenol-containing polymer, while the rest is the same as in Embodiment 1, as detailed below:

[0136] The protective layer comprises the following components in parts by weight:

[0137] 100 parts matrix resin, 15 parts phenol-containing polymer.

[0138] Example 21

[0139] This embodiment provides a radiation-resistant cable, which differs from Embodiment 1 in that the amount of each component in the protective layer is different; otherwise, it is the same as Embodiment 1, as detailed below:

[0140] The protective layer comprises the following components in parts by weight:

[0141] 90 parts matrix resin, 10 parts phenol-containing polymer, 10 parts filler, 3 parts plasticizer, 1 part lubricant, and 0.5 parts stabilizer.

[0142] Example 22

[0143] This embodiment provides a radiation-resistant cable, which differs from Embodiment 1 in that the amount of each component in the protective layer is different; otherwise, it is the same as Embodiment 1, as detailed below:

[0144] The protective layer comprises the following components in parts by weight:

[0145] 120 parts matrix resin, 20 parts phenol-containing polymer, 20 parts filler, 10 parts plasticizer, 4 parts lubricant, and 2 parts stabilizer.

[0146] Performance testing

[0147] Since the radiation resistance and other properties of the cable of this invention are mainly provided by the protective layer, the following performance tests were conducted on the protective layers of each embodiment and comparative example:

[0148] 1. Radiation resistance and corrosion resistance test

[0149] (1) Sample preparation

[0150] The protective layer was removed from the radiation-resistant cable of each embodiment or comparative example. According to GB / T 1040.3-2006 standard, the protective layer was cut into Type 2 specimens with a length of 150 mm, a width of 10 mm, and a thickness of 1 mm, and its tensile strength was measured and recorded as Q1, with the unit being MPa.

[0151] (2) Radiation resistance test

[0152] The type 2 sample prepared in (1) was exposed to 90±2℃ and an irradiance of 0.89W / m. 2 After being treated in a UV irradiation environment for 36 hours, the material was removed, and the tensile strength of the protective layer after radiation was measured according to GB / T 1040.3-2006 standard, denoted as Q2, in MPa. The radiation resistance loss rate (%) was calculated using the following formula:

[0153] Radiation resistance loss rate (%) = [(Q1-Q2) / Q1] × 100%;

[0154] The lower the radiation resistance loss rate (%), the higher the radiation resistance of the protective layer, and the higher the radiation resistance of the cable.

[0155] (3) Corrosion resistance test

[0156] The type 2 sample prepared in (1) was immersed in ethylene glycol at 120℃ for 120h, then removed. According to GB / T 1040.3-2006 standard, the tensile strength of the protective layer after corrosion was measured and recorded as Q3, with the unit being MPa. The corrosion loss rate (%) was calculated according to the following formula:

[0157] Corrosion loss rate (%) = [(Q1-Q3) / Q1] × 100%;

[0158] The lower the corrosion loss rate (%), the higher the corrosion resistance of the protective layer and the higher the corrosion resistance of the cable.

[0159] 2. Wear resistance test

[0160] At 200℃, the protective layer raw materials mixed in each embodiment or comparative example were hot-pressed into samples 30mm long, 10mm wide, and 6mm thick, weighed, and recorded as M1 (g). Then, under the conditions of a rotation speed of 200r / min, a load of 50N, and a loading time of 30min, the samples were vertically placed on a vertical universal friction and wear testing machine for testing, and weighed again, recorded as M2 (g). The wear value (g / m) was calculated according to the following formula. 2 ):

[0161] Wear value (g / m) 2 )=(M1-M2) / 0.0003

[0162] Wear value (g / m) 2 The smaller the value, the better the wear resistance of the protective layer, and the better the wear resistance of the cable.

[0163] The experimental results are shown in the table below:

[0164] Table 8 Performance test results of each embodiment and comparative example

[0165]

[0166]

[0167] As shown in Table 8, the present invention improves the radiation resistance of the protective layer based on polyethylene resin and polyvinyl chloride resin by using a phenol-containing polymer obtained by polymerizing 2,4-diaminophenol, 4-aminocyclohexanecarboxylic acid and sebacic acid in a specific ratio. This results in a cable made using the protective layer that has radiation resistance, i.e., a radiation-resistant cable.

[0168] In addition, the protective layer of the present invention also has good wear resistance and corrosion resistance.

[0169] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A radiation-resistant cable, characterized in that, It includes, from the inside out, a wire core, an insulation layer, a shielding layer, and a protective layer, wherein the protective layer comprises the following components in parts by weight: 90-120 parts matrix resin, 10-20 parts phenol-containing polymer; The phenol-containing polymer is obtained by polymerization of 2,4-diaminophenol, 4-aminocyclohexanecarboxylic acid and sebacic acid in a molar ratio of 2:(0.5-2):(1-3). The matrix resin includes polyethylene resin and polyvinyl chloride resin.

2. The radiation-resistant cable as described in claim 1, characterized in that, The molar ratio of 2,4-diaminophenol, 4-aminocyclohexanecarboxylic acid and sebacic acid is 2:(0.5-1.5):(2-3).

3. The radiation-resistant cable as described in claim 1, characterized in that, Includes at least one of the following (1)-(3): (1) The preparation method of the phenol-containing polymer is as follows: under the action of a catalyst, 2,4-diaminophenol, 4-aminocyclohexanecarboxylic acid and sebacic acid are polymerized by condensation reaction to obtain the phenol-containing polymer. (2) The weight ratio of the polyethylene resin and the polyvinyl chloride resin is 1:(0.5-2); (3) The polyethylene resin is at least one of low-density polyethylene, high-density polyethylene and linear low-density polyethylene.

4. The radiation-resistant cable as described in claim 1, characterized in that, Includes at least one of the following (1)-(2): (1) The melt flow rate of the polyethylene resin at 190℃ and 2.16kg load is 1-9g / 10min; (2) The degree of polymerization of the polyvinyl chloride resin is 600-1900.

5. The radiation-resistant cable as described in claim 1, characterized in that, The protective layer also includes at least one of fillers, plasticizers, lubricants, and stabilizers.

6. The radiation-resistant cable as described in claim 5, characterized in that, Includes at least one of the following (1)-(4): (1) The filler includes at least one of silicon carbide, talc, boron nitride, graphite, diatomite, and kaolin. (2) The plasticizer is at least one of dioctyl adipate, dioctyl sebacate, di-n-hexyl sebacate, tributyl citrate and acetylated tributyl citrate; (3) The lubricant is at least one of polyethylene wax, stearic acid, and pentaerythritol stearate; (4) The stabilizer is at least one of calcium zinc stabilizer and calcium stearate.

7. The radiation-resistant cable as described in claim 6, characterized in that, Includes at least one of the following (1)-(3): (1) The filler comprises silicon carbide and talc in a weight ratio of 1:(0.5-1.5); (2) The average particle size of the silicon carbide is 100-300 nm; (3) The talc powder has a mesh size of 2000-8000 mesh.

8. The radiation-resistant cable as described in claim 5, characterized in that, Includes at least one of the following (1)-(4): (1) The filler is 10-20 parts by weight; (2) The plasticizer is 3-10 parts by weight; (3) The lubricant is 1-4 parts by weight; (4) The stabilizer is 0.5-2 parts by weight.

9. A method for preparing a radiation-resistant cable as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. Extruding the raw material of the insulation layer onto the surface of the wire core to obtain a wire core covered with an insulation layer; S2. Wrap the wire core covered with the shielding layer material to obtain a wire core covered with a shielding layer; S3. Extrude the raw material of the protective layer onto the surface of the wire core covered with the shielding layer to obtain the radiation-resistant cable.

10. An application of the radiation-resistant cable as described in any one of claims 1-8 in a robot.

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