A highly flexible, wear-resistant and bending-resistant industrial automation cable

Abstract

The present invention relates to a highly flexible, wear-resistant and bend-resistant industrial automation cable, and belongs to the technical field of cables. A highly flexible, wear-resistant and bend-resistant industrial automation cable comprises a conductive core, a metal shielding layer and a protective layer. A conductive core group is formed by twisting a plurality of conductive cores. The metal shielding layer wraps the conductive core group. The protective layer is arranged on the outer wall of the metal shielding layer. A protective film layer is arranged on the outer surface of the protective layer. The protective layer is made of PVC material, and the protective film layer is obtained after the protective coating is cured. The present invention uses oleic acid to treat a silane coupling agent. The modified silane coupling agent increases the fluidity of alumina in the coating composite material, increases its dispersibility, increases its stability, and enables it to have a certain self-repairing ability, improves wear resistance and mechanical properties, has excellent tensile strength, elongation at break and hardness, and has certain wear resistance characteristics.

Description

Technical Field

[0001] The invention belongs to the technical field of cables and relates to a highly flexible, wear-resistant and bending-resistant industrial automation cable. Background Art

[0002] Industrial automation cables are cables designed specifically to meet the complex connection requirements between various mechanical equipment and control systems in the field of industrial automation. These cables play a vital role in automated production lines, robotics, CNC machine tools, assembly lines, and various automated equipment. They not only need to transmit power, but also be able to transmit control signals and data information to ensure the efficient and stable operation of the entire automation system.

[0003] In industrial automation environments, equipment often needs to start, stop, move, and turn frequently, which requires that the cables connecting these devices must be highly flexible. Highly flexible cables can withstand repeated bending and twisting without damage, thereby ensuring the service life of the cables and the reliability of the system. In addition, automation cables may be exposed to various oils, chemicals, or mechanical wear during use, so they also need to have wear-resistant and bending-resistant properties. Wear resistance ensures that the cable sheath will not wear quickly due to friction, thereby avoiding the exposure of the internal conductor and the risk of short circuit. Bending resistance ensures that the cable can maintain its structural integrity and electrical performance even under extreme bending conditions, which is essential to ensure the continuity and safety of the automation system. Summary of the invention

[0004] The purpose of the present invention is to provide a highly flexible, wear-resistant and bend-resistant industrial automation cable. The present invention uses oleic acid to modify the silane coupling agent, and the modified silane coupling agent increases the fluidity of aluminum oxide in the coating composite material, increases its dispersibility, and increases its stability, so that it has a certain self-repairing ability, improves wear resistance and mechanical properties, has excellent tensile strength, elongation at break and hardness, and has certain wear resistance characteristics.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A highly flexible, wear-resistant and bending-resistant industrial automation cable, the automation cable comprising a conductive core, a metal shielding layer and a protective layer, a conductive core group is formed by twisting a plurality of conductive cores, the metal shielding layer wraps the conductive core group, the protective layer is arranged on the outer wall of the metal shielding layer, a protective film layer is arranged on the outer surface of the protective layer, the protective layer is made of PVC material, the protective film layer is obtained by curing a protective coating, and the protective coating comprises the following components by weight: 70-78 parts of acrylic resin, 15-20 parts of triethylene glycol diacrylate, 10-13 parts of tetrahydrofuran methacrylate, 8-10 parts of modified alumina, 1-2 parts of antioxidant, 1.5-2.3 parts of plasticizer and 0.4-0.6 parts of photoinitiator;

[0007] Wherein, the preparation method of the modified alumina comprises the following steps:

[0008] 1) After alumina is placed in anhydrous ethanol and stirred thoroughly, a coupling agent is added and the mixture is kept at a constant temperature. After the solvent is filtered off, the solid is washed and dried to obtain prefabricated particles;

[0009] 2) The prefabricated particles and anhydrous ethanol are mixed and then ultrasonically dispersed, dihydroxybenzaldehyde is added and heated to mix, the solvent is filtered to remove, and the solid is washed and dried to obtain modified alumina.

[0010] As a preferred technical solution of the present invention, in step 1), the sufficient stirring is stirring at a speed of 1100-1500r / min for 15-20min; the constant temperature treatment is stirring at a temperature of 64-70°C for 6-8h; the washing is washing with anhydrous ethanol for 3-4 times; and the drying is drying at a temperature of 80-90°C to constant weight.

[0011] As a preferred technical solution of the present invention, in step 1), the mass ratio of the alumina, anhydrous ethanol and coupling agent is 12-14:45-52:3.4-4.6; the coupling agent is an oleic acid-modified coupling agent; and the alumina is a γ-type alumina with a particle size of 60 nm.

[0012] As a preferred technical solution of the present invention, in step 2), the ultrasonic dispersion is performed at a frequency of 300-400W for 10-15min; the heating and mixing is performed at a temperature of 60-70°C and a speed of 300-400r / min for 5-6h; the washing is performed 3-4 times with anhydrous ethanol; and the drying is performed at a temperature of 70-80°C to constant weight.

[0013] As a preferred technical solution of the present invention, in step 2), the mass ratio of the prefabricated particles, anhydrous ethanol and dihydroxybenzaldehyde is 11-13:30-40:3.4-4.0; the dihydroxybenzaldehyde is one or two of 3,4-dihydroxybenzaldehyde and 2,3-dihydroxybenzaldehyde.

[0014] As a preferred technical solution of the present invention, the preparation of the oleic acid modified coupling agent includes the following steps: stirring the silane coupling agent NQ-62 and anhydrous ethanol at a speed of 400-500r / min and a temperature of 45-50°C for 20-30min, adding oleic acid and azobisisobutyronitrile under stirring, stirring at a temperature of 60-65°C and a speed of 400-500r / min for 5-6h, cooling to room temperature, and removing the solvent by rotary evaporation to obtain the coupling agent.

[0015] As a preferred technical solution of the present invention, the mass ratio of the silane coupling agent NQ-62, anhydrous ethanol, oleic acid and azobisisobutyronitrile is 5-7:15-20:3.4-4.0:0.18-0.21; the silane coupling agent NQ-62 is diethylenetriaminopropyltrimethoxysilane.

[0016] As a preferred technical solution of the present invention, the preparation method of the acrylic resin comprises the following steps: in an inert atmosphere, after mixing a solvent and an initiator, adding dicyclopentene methacrylate, methacrylic acid, styrene and methyl methacrylate, heating and stirring, to obtain an acrylic resin.

[0017] As a preferred technical solution of the present invention, the inert atmosphere is a nitrogen atmosphere; the heating and stirring is stirring at a temperature of 70-75°C for 5-6h; the mass ratio of the solvent, initiator, dicyclopentene methacrylate, methacrylic acid, styrene and methyl methacrylate is 30-36: 0.40-0.42: 3.0-3.3: 1.8-2.4: 0.28-0.34: 4.2-4.6; the solvent is diethylene glycol methyl ethyl ether; the initiator is one or more of azobisisobutyronitrile, ammonium persulfate, azobisisoheptanenitrile, dimethyl azobisisobutyrate, azoisobutylcyanamide, tert-butyl hydroperoxide, dibenzoyl peroxide and cumene hydroperoxide.

[0018] As a preferred technical solution of the present invention, in the protective coating, the antioxidant is one or more of antioxidant 1010, antioxidant 1076 and antioxidant 168; the plasticizer is a mixture of dinonyl phthalate and tricresyl phosphate in a mass ratio of 4:1.0-1.6; and the photoinitiator is photoinitiator 651.

[0019] Beneficial effects of the present invention:

[0020] The present invention modifies a silane coupling agent by using oleic acid, and introduces a flexible chain segment. The modified silane coupling agent increases the fluidity of aluminum oxide in a coating composite material, and increases its dispersibility. The prefabricated particles and the hydroxyl groups of dihydroxybenzaldehyde are bonded by hydrogen bonds, coordination bonds and electrostatic adsorption, and the grafting rate is effectively increased. More Schiff base structures are obtained by chemically connecting the silane coupling agent with the aldehyde group, and its stability is increased, so that it has a certain self-repairing ability, and the wear resistance and mechanical properties are improved. The modified aluminum oxide can participate in the polymerization reaction in the coating composite material through covalent bonds, and at the same time, its interface bonding force and compatibility in the system are increased. The introduction of flexible silaneoxy chain segments and rigid benzene ring structures can absorb energy when subjected to impact force, and play a reinforcing and toughening effect. DETAILED DESCRIPTION

[0021] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments.

[0022] Example 1

[0023] The protective coating comprises the following components by weight: 70 parts of acrylic resin, 15 parts of triethylene glycol diacrylate, 10 parts of tetrahydrofuran methacrylate, 8 parts of modified aluminum oxide, 1 part of antioxidant, 1.5 parts of plasticizer and 0.4 parts of photoinitiator;

[0024] The antioxidant is antioxidant 1010; the plasticizer is prepared by mixing dinonyl phthalate and tricresyl phosphate in a mass ratio of 4:1.0; and the photoinitiator is photoinitiator 651.

[0025] The preparation method of the acrylic resin comprises the following steps: in a nitrogen atmosphere, diethylene glycol methyl ethyl ether and azobisisobutyronitrile are mixed, and then dicyclopentene methacrylate, methacrylic acid, styrene and methyl methacrylate are added and stirred at a temperature of 70°C for 5 hours to obtain the acrylic resin; the mass ratio of the diethylene glycol methyl ethyl ether, azobisisobutyronitrile, dicyclopentene methacrylate, methacrylic acid, styrene and methyl methacrylate is 30:0.40:3.0:1.8:0.28:4.2.

[0026] The preparation of the oleic acid modified coupling agent comprises the following steps: stirring the silane coupling agent NQ-62 and anhydrous ethanol at a speed of 400 r / min and a temperature of 45° C. for 20 minutes, adding oleic acid and azobisisobutyronitrile under stirring, stirring at a temperature of 60° C. and a speed of 400 r / min for 5 hours, cooling to room temperature, and removing the solvent by rotary evaporation to obtain the coupling agent; the mass ratio of the silane coupling agent NQ-62, anhydrous ethanol, oleic acid and azobisisobutyronitrile is 5:15:3.4:0.18.

[0027] The preparation method of the modified alumina comprises the following steps:

[0028] 1) Alumina is placed in anhydrous ethanol, stirred at a speed of 1100 r / min for 15 minutes, a coupling agent is added and stirred at a temperature of 64°C for 6 hours, the solvent is filtered off, the solid is taken, washed with anhydrous ethanol for 3 times, and dried at a temperature of 80°C to constant weight to obtain prefabricated particles; the mass ratio of the alumina, anhydrous ethanol and the coupling agent is 12:45:3.4; the coupling agent is an oleic acid-modified coupling agent; the alumina is a γ-type alumina with a particle size of 60 nm.

[0029] 2) After the prefabricated particles and anhydrous ethanol are mixed, ultrasonication is performed at a frequency of 300 W for 10 minutes, dihydroxybenzaldehyde is added, and the mixture is stirred at a temperature of 60° C. and a speed of 300 r / min for 5 hours. After filtering to remove the solvent, the solid is taken, washed with anhydrous ethanol for 3 times, and dried to constant weight at a temperature of 70° C. to obtain modified alumina; the mass ratio of the prefabricated particles, anhydrous ethanol and dihydroxybenzaldehyde is 11:30:3.4; the dihydroxybenzaldehyde is 3,4-dihydroxybenzaldehyde.

[0030] Example 2

[0031] The protective coating comprises the following components in parts by weight: 73 parts of acrylic resin, 17 parts of triethylene glycol diacrylate, 11 parts of tetrahydrofuran methacrylate, 8.5 parts of modified aluminum oxide, 1.5 parts of antioxidant, 1.8 parts of plasticizer and 0.45 parts of photoinitiator;

[0032] The antioxidant is antioxidant 1010; the plasticizer is prepared by mixing dinonyl phthalate and tricresyl phosphate in a mass ratio of 4:1.2; and the photoinitiator is photoinitiator 651.

[0033] The preparation method of the acrylic resin comprises the following steps: in a nitrogen atmosphere, diethylene glycol methyl ethyl ether and azobisisobutyronitrile are mixed, and then dicyclopentene methacrylate, methacrylic acid, styrene and methyl methacrylate are added and stirred at a temperature of 72°C for 5.5 hours to obtain the acrylic resin; the mass ratio of the diethylene glycol methyl ethyl ether, azobisisobutyronitrile, dicyclopentene methacrylate, methacrylic acid, styrene and methyl methacrylate is 32:0.41:3.1:2:0.3:4.3.

[0034] The preparation of the oleic acid modified coupling agent comprises the following steps: stirring the silane coupling agent NQ-62 and anhydrous ethanol at a speed of 430 r / min and a temperature of 47° C. for 23 minutes, adding oleic acid and azobisisobutyronitrile under stirring, stirring for 5.5 hours at a temperature of 62° C. and a speed of 430 r / min, cooling to room temperature, and removing the solvent by rotary evaporation to obtain the coupling agent; the mass ratio of the silane coupling agent NQ-62, anhydrous ethanol, oleic acid and azobisisobutyronitrile is 5.7:17:3.6:0.19.

[0035] The preparation method of the modified alumina comprises the following steps:

[0036] 1) Alumina is placed in anhydrous ethanol, stirred at a speed of 1230 r / min for 17 minutes, and then a coupling agent is added and stirred at a temperature of 66° C. for 6.5 hours. After filtering off the solvent, the solid is taken, washed with anhydrous ethanol for 3 times, and dried at a temperature of 83° C. to constant weight to obtain prefabricated particles; the mass ratio of the alumina, anhydrous ethanol and the coupling agent is 12.7:47:3.8; the coupling agent is an oleic acid-modified coupling agent; the alumina is a γ-type alumina with a particle size of 60 nm.

[0037] 2) After the prefabricated particles and anhydrous ethanol are mixed, ultrasonication is performed at a frequency of 330 W for 12 minutes, dihydroxybenzaldehyde is added, and the mixture is stirred at a temperature of 63° C. and a speed of 330 r / min for 5.5 hours. After filtering and removing the solvent, the solid is taken, washed with anhydrous ethanol for 3 times, and dried to constant weight at a temperature of 73° C. to obtain modified alumina; the mass ratio of the prefabricated particles, anhydrous ethanol and dihydroxybenzaldehyde is 11.6:33:3.6; the dihydroxybenzaldehyde is 3,4-dihydroxybenzaldehyde.

[0038] Example 3

[0039] The protective coating comprises the following components in parts by weight: 75 parts of acrylic resin, 18 parts of triethylene glycol diacrylate, 12 parts of tetrahydrofuran methacrylate, 9.3 parts of modified aluminum oxide, 1.5 parts of antioxidant, 2 parts of plasticizer and 0.53 parts of photoinitiator;

[0040] The antioxidant is antioxidant 1010; the plasticizer is prepared by mixing dinonyl phthalate and tricresyl phosphate in a mass ratio of 4:1.4; and the photoinitiator is photoinitiator 651.

[0041] The preparation method of the acrylic resin comprises the following steps: in a nitrogen atmosphere, diethylene glycol methyl ethyl ether and azobisisobutyronitrile are mixed, and then dicyclopentene methacrylate, methacrylic acid, styrene and methyl methacrylate are added and stirred at a temperature of 73°C for 5.7 hours to obtain the acrylic resin; the mass ratio of the diethylene glycol methyl ethyl ether, azobisisobutyronitrile, dicyclopentene methacrylate, methacrylic acid, styrene and methyl methacrylate is 34:0.42:3.2:2.2:0.32:4.5.

[0042] The preparation of the oleic acid modified coupling agent comprises the following steps: stirring the silane coupling agent NQ-62 and anhydrous ethanol at a speed of 460 r / min and a temperature of 48° C. for 27 minutes, adding oleic acid and azobisisobutyronitrile under stirring, stirring for 5.5 hours at a temperature of 63° C. and a speed of 460 r / min, cooling to room temperature, and removing the solvent by rotary evaporation to obtain the coupling agent; the mass ratio of the silane coupling agent NQ-62, anhydrous ethanol, oleic acid and azobisisobutyronitrile is 6.3:18:3.8:0.2.

[0043] The preparation method of the modified alumina comprises the following steps:

[0044] 1) Alumina is placed in anhydrous ethanol, stirred at a speed of 1360 r / min for 18 minutes, a coupling agent is added and stirred at 68° C. for 7.5 hours, the solvent is filtered off, the solid is taken, washed with anhydrous ethanol for 4 times, and dried at 87° C. to constant weight to obtain prefabricated particles; the mass ratio of the alumina, anhydrous ethanol and the coupling agent is 13.3:50:4.2; the coupling agent is an oleic acid-modified coupling agent; the alumina is a γ-type alumina with a particle size of 60 nm.

[0045] 2) After the prefabricated particles and anhydrous ethanol are mixed, ultrasonication is performed at a frequency of 360 W for 13 minutes, dihydroxybenzaldehyde is added, and the mixture is stirred at a temperature of 67° C. and a speed of 360 r / min for 5.5 hours. After filtering and removing the solvent, the solid is taken, washed with anhydrous ethanol for 4 times, and dried to constant weight at a temperature of 77° C. to obtain modified alumina; the mass ratio of the prefabricated particles, anhydrous ethanol and dihydroxybenzaldehyde is 12.3:37:3.8; the dihydroxybenzaldehyde is 3,4-dihydroxybenzaldehyde.

[0046] Example 4

[0047] The protective coating comprises the following components by weight: 78 parts of acrylic resin, 20 parts of triethylene glycol diacrylate, 13 parts of tetrahydrofuran methacrylate, 10 parts of modified aluminum oxide, 2 parts of antioxidant, 2.3 parts of plasticizer and 0.6 parts of photoinitiator;

[0048] The antioxidant is antioxidant 1010; the plasticizer is a mixture of dinonyl phthalate and tricresyl phosphate in a mass ratio of 4:1.6; and the photoinitiator is photoinitiator 651.

[0049] The preparation method of the acrylic resin comprises the following steps: in a nitrogen atmosphere, diethylene glycol methyl ethyl ether and azobisisobutyronitrile are mixed, and then dicyclopentene methacrylate, methacrylic acid, styrene and methyl methacrylate are added and stirred at a temperature of 75°C for 6 hours to obtain the acrylic resin; the mass ratio of the diethylene glycol methyl ethyl ether, azobisisobutyronitrile, dicyclopentene methacrylate, methacrylic acid, styrene and methyl methacrylate is 36:0.42:3.3:2.4:0.34:4.6.

[0050] The preparation of the oleic acid modified coupling agent comprises the following steps: stirring the silane coupling agent NQ-62 and anhydrous ethanol at a speed of 500 r / min and a temperature of 50° C. for 30 minutes, adding oleic acid and azobisisobutyronitrile under stirring, stirring at a temperature of 65° C. and a speed of 500 r / min for 6 hours, cooling to room temperature, and removing the solvent by rotary evaporation to obtain the coupling agent; the mass ratio of the silane coupling agent NQ-62, anhydrous ethanol, oleic acid and azobisisobutyronitrile is 7:20:4.0:0.21.

[0051] The preparation method of the modified alumina comprises the following steps:

[0052] 1) Alumina is placed in anhydrous ethanol, stirred at a speed of 1500 r / min for 20 minutes, a coupling agent is added and stirred at a temperature of 70°C for 8 hours, the solvent is filtered off, the solid is taken, washed with anhydrous ethanol for 4 times, and dried at a temperature of 90°C to constant weight to obtain prefabricated particles; the mass ratio of the alumina, anhydrous ethanol and the coupling agent is 14:52:4.6; the coupling agent is an oleic acid-modified coupling agent; the alumina is a γ-type alumina with a particle size of 60 nm.

[0053] 2) After the prefabricated particles and anhydrous ethanol are mixed, ultrasonication is performed at a frequency of 400 W for 15 minutes, dihydroxybenzaldehyde is added, and the mixture is stirred at a temperature of 70° C. and a speed of 400 r / min for 6 hours. After filtering to remove the solvent, the solid is taken, washed with anhydrous ethanol for 4 times, and dried to constant weight at a temperature of 80° C. to obtain modified alumina; the mass ratio of the prefabricated particles, anhydrous ethanol and dihydroxybenzaldehyde is 13:40:4.0; and the dihydroxybenzaldehyde is 3,4-dihydroxybenzaldehyde.

[0054] Comparative Example 1

[0055] Compared with Example 4, the difference in Comparative Example 1 is that γ-aminopropyltriethoxysilane is used instead of the silane coupling agent NQ-62, and the other components, preparation steps and parameters are the same.

[0056] Comparative Example 2

[0057] Compared with Example 4, Comparative Example 2 is different in that vinyltrimethoxysilane is used instead of the silane coupling agent NQ-62, and the other components, preparation steps and parameters are the same.

[0058] Comparative Example 3

[0059] Compared with Example 4, Comparative Example 3 is different in that the silane coupling agent NQ-62 is not used, and the other components, preparation steps and parameters are the same.

[0060] Comparative Example 4

[0061] Compared with Example 4, Comparative Example 4 is different in that oleic acid is not used, and the other components, preparation steps and parameters are the same.

[0062] Comparative Example 5

[0063] Compared with Example 4, Comparative Example 5 is different in that no coupling agent is used in step 1), and the remaining components, preparation steps and parameters are the same.

[0064] Comparative Example 6

[0065] Compared with Example 4, Comparative Example 6 is different in that dihydroxybenzaldehyde is not used in step 2), and the remaining components, preparation steps and parameters are the same.

[0066] The raw materials of Examples 1-4 and Comparative Examples 1-6 were mixed to obtain coatings. The samples obtained after UV curing were tested as follows. The test results are shown in Table 1.

[0067] Mechanical properties test: samples with a size of 20 mm × 10 mm × 0.5 mm were used. A universal testing machine was used with a crosshead speed set at 10 mm / min. Each sample was measured three times (tensile strength and elongation at break), and the average value was calculated as the final result.

[0068] Wear resistance test: A sample of 3cm×2cm×0.5cm was prepared and the wear resistance test was carried out using a friction and wear testing machine; the dual sample was steel 440-C, the rotation speed was 400r / min, the load was 100N, the experimental time was 1h, and the wear amount was measured by the weighing method.

[0069] Table 1

[0070] Tensile strength(Mpa) Elongation at break (%) Wear amount (mg) Example 1 46.2 338 107 Example 2 46.1 349 110 Example 3 46.3 331 102 Example 4 45.8 354 112 Comparative Example 1 34.3 263 171 Comparative Example 2 33.1 259 178 Comparative Example 3 30.5 228 186 Comparative Example 4 36.2 202 173 Comparative Example 5 28.4 198 214 Comparative Example 6 32.8 243 181

[0071] From the test results in Table 1, it can be seen that compared with Comparative Examples 1-6, the mechanical properties of the protective film layer prepared in Examples 1-4 of the present invention are significantly better than those in Comparative Examples 1-6.

[0072] From the comparative analysis of Examples 1-4 and Comparative Examples 1-6 in combination with Table 1, it can be seen that the lack of amino groups or active vinyl groups has reduced mechanical properties. This is because the oleic acid-modified silane coupling agent contains vinyl and flexible long carbon chains, which enable it to participate in the polymerization reaction in the system and increase the interfacial bonding force between it and other components. At the same time, the introduction of flexible silane alkoxy chain segments and long carbon chains increases the fluidity of the filler, plays an enhancing and toughening effect, and thus improves the mechanical properties of the coating; the lack of dihydroxybenzaldehyde, the Schiff base structure and the benzene ring structure are not introduced, and its compatibility, interfacial bonding force and stability in the system are reduced, resulting in a decrease in the mechanical properties of the coating.

[0073] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A highly flexible, wear-resistant and bending-resistant industrial automation cable, characterized in that: The automation cable comprises a conductive core, a metal shielding layer and a protective layer. A conductive core group is formed by twisting a plurality of conductive cores. The metal shielding layer wraps the conductive core group. The protective layer is arranged on the outer wall of the metal shielding layer. A protective film layer is arranged on the outer surface of the protective layer. The protective layer is made of PVC material. The protective film layer is obtained by curing a protective coating. The protective coating comprises the following components by weight: 70-78 parts of acrylic resin, 15-20 parts of triethylene glycol diacrylate, 10-13 parts of tetrahydrofuran methacrylate, 8-10 parts of modified alumina, 1-2 parts of antioxidant, 1.5-2.3 parts of plasticizer and 0.4-0.6 parts of photoinitiator. Wherein, the preparation method of the modified alumina comprises the following steps: 1) After alumina is placed in anhydrous ethanol and stirred thoroughly, a coupling agent is added and the mixture is kept at a constant temperature. After the solvent is filtered off, the solid is washed and dried to obtain prefabricated particles; 2) The prefabricated particles and anhydrous ethanol are mixed and ultrasonically dispersed, dihydroxybenzaldehyde is added and heated to mix, the solvent is filtered to remove, and the solid is washed and dried to obtain modified alumina.

2. A highly flexible, wear-resistant and bending-resistant industrial automation cable according to claim 1, characterized in that: In step 1), the sufficient stirring is stirring at a speed of 1100-1500 r / min for 15-20 min; the constant temperature treatment is stirring at a temperature of 64-70° C. for 6-8 h; the washing is washing with anhydrous ethanol for 3-4 times; and the drying is drying at a temperature of 80-90° C. to constant weight.

3. The highly flexible, wear-resistant and bending-resistant industrial automation cable according to claim 1, characterized in that: In step 1), the mass ratio of the alumina, anhydrous ethanol and coupling agent is 12-14:45-52:3.4-4.6; the coupling agent is an oleic acid-modified coupling agent; and the alumina is a γ-type alumina with a particle size of 60 nm.

4. The highly flexible, wear-resistant and bending-resistant industrial automation cable according to claim 1, characterized in that: In step 2), the ultrasonic dispersion is performed at a frequency of 300-400W for 10-15 minutes; the heating and mixing is performed at a temperature of 60-70°C and a speed of 300-400r / min for 5-6 hours; the washing is performed 3-4 times with anhydrous ethanol; and the drying is performed at a temperature of 70-80°C to constant weight.

5. The highly flexible, wear-resistant and bending-resistant industrial automation cable according to claim 1, characterized in that: In step 2), the mass ratio of the prefabricated particles, anhydrous ethanol and dihydroxybenzaldehyde is 11-13:30-40:3.4-4.0; the dihydroxybenzaldehyde is one or two of 3,4-dihydroxybenzaldehyde and 2,3-dihydroxybenzaldehyde.

6. The highly flexible, wear-resistant and bending-resistant industrial automation cable according to claim 3, characterized in that: The preparation of the oleic acid modified coupling agent comprises the following steps: stirring the silane coupling agent NQ-62 and anhydrous ethanol at a speed of 400-500 r / min and a temperature of 45-50° C. for 20-30 min, adding oleic acid and azobisisobutyronitrile under stirring, stirring at a temperature of 60-65° C. and a speed of 400-500 r / min for 5-6 h, cooling to room temperature, and removing the solvent by rotary evaporation to obtain the coupling agent.

7. The highly flexible, wear-resistant and bending-resistant industrial automation cable according to claim 6, characterized in that: The mass ratio of the silane coupling agent NQ-62, anhydrous ethanol, oleic acid and azobisisobutyronitrile is 5-7:15-20:3.4-4.0:0.18-0.

21.

8. The highly flexible, wear-resistant and bending-resistant industrial automation cable according to claim 1, characterized in that: The preparation method of the acrylic resin comprises the following steps: in an inert atmosphere, a solvent and an initiator are mixed, and dicyclopentene methacrylate, methacrylic acid, styrene and methyl methacrylate are added, and the mixture is heated and stirred to obtain the acrylic resin.

9. The highly flexible, wear-resistant and bending-resistant industrial automation cable according to claim 8, characterized in that: The inert atmosphere is a nitrogen atmosphere; the heating and stirring is stirring at a temperature of 70-75° C. for 5-6 hours; the mass ratio of the solvent, initiator, dicyclopentene methacrylate, methacrylic acid, styrene and methyl methacrylate is 30-36: 0.40-0.42: 3.0-3.3: 1.8-2.4: 0.28-0.34: 4.2-4.6; the solvent is diethylene glycol methyl ethyl ether; the initiator is one or more of azobisisobutyronitrile, ammonium persulfate, azobisisoheptanenitrile, dimethyl azobisisobutyrate, azoisobutylcyanamide, tert-butyl hydroperoxide, dibenzoyl peroxide and isopropylbenzene hydroperoxide.

10. The highly flexible, wear-resistant and bending-resistant industrial automation cable according to claim 1, characterized in that: In the protective coating, the antioxidant is one or more of antioxidant 1010, antioxidant 1076 and antioxidant 168; the plasticizer is a mixture of dinonyl phthalate and tricresyl phosphate in a mass ratio of 4:1.0-1.6; and the photoinitiator is photoinitiator 651.