Flexible anti-impact cable and application thereof in industrial robot

Abstract

The invention relates to a flexible anti-impact cable and application thereof in an industrial robot, and belongs to the technical field of cables. The invention provides a cable which sequentially comprises an energy-absorbing outer layer, a buffering inner layer and an anti-impact insulating layer from outside to inside, a TPU molecular chain of the energy-absorbing outer layer can provide free rotation capacity, a microsphere foaming agent forms elastic micropores in TPU, the overall modulus is reduced, and bendability is improved; by using methyl vinyl silicone rubber in the buffer inner layer, high flexibility and rebound resilience are achieved, and local fracture is effectively prevented; low-density polyethylene in the impact-resistant insulating layer also has good softness and elasticity, and aluminum hydroxide and nano silicon dioxide form a reinforced network to resist internal deformation; all layers of materials enhance interface adhesion through silicone to form a stress transition area, so that external stress can be effectively dispersed, the impact resistance can be improved, enough flexibility can be provided for the cable, and the cable has a good application prospect in the aspect of industrial robots.

Description

Technical Field

[0001] The invention belongs to the technical field of cables and relates to a flexible impact-resistant cable and an application thereof in an industrial robot. Background Art

[0002] Industrial robot cables are high-performance cables designed specifically for industrial robotic systems. They transmit power, signals, and data, and are crucial components for the proper functioning of robots. They are widely used in industries such as automotive manufacturing, electronics assembly, logistics and warehousing, and food processing. With the increasing automation of industry, the demand for robot cables is growing, and their performance and quality directly impact the reliability and flexibility of the entire automated production line.

[0003] In practical applications, industrial robot cables must possess a variety of high-performance features to meet the demands of demanding industrial environments. However, many current industrial robot cables have significant deficiencies. For example, some cables lack flexibility. Robots frequently perform high-speed, multi-angle movements, and long-term bending of conventional cables can easily lead to internal conductor breakage or insulation damage. Furthermore, some cables have poor impact resistance. Impacts from equipment collisions or falling objects can damage the insulation, leading to power interruptions or signal interference, which can, in severe cases, create the risk of electrical leakage or fire. Summary of the Invention

[0004] The purpose of the present invention is to provide a flexible impact-resistant cable and its application in industrial robots. The present invention provides an energy-absorbing outer layer, a buffer inner layer, and an impact-resistant insulation layer structure, wherein the TPU molecular chain of the energy-absorbing outer layer can provide free rotation ability, and the microsphere foaming agent forms elastic micropores in the TPU, reducing the overall modulus and improving bendability; the use of methyl vinyl silicone rubber in the buffer inner layer imparts high flexibility and resilience, effectively preventing local fracture; the low-density polyethylene in the impact-resistant insulation layer also has good softness and elasticity, while aluminum hydroxide and nano-silicon dioxide form a reinforced network to resist internal deformation; the various layers of material are adhered to the interface through silicone enhancement to form a stress transition zone, which can not only effectively disperse external stress and improve impact resistance, but also provide sufficient softness for the cable, and has good application prospects in industrial robots.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A flexible impact-resistant cable comprises, from outside to inside, an energy-absorbing outer layer, a buffer inner layer, and an impact-resistant insulating layer; the mass ratio of the energy-absorbing outer layer, the buffer inner layer, and the impact-resistant insulating layer is 1.5-1.9:0.8-1.2:1-1.4.

[0006] Furthermore, the raw materials of the energy-absorbing outer layer include, by weight, 86-90 parts of TPU, 8-12 parts of microsphere foaming agent, 0.6-1 part of antioxidant 1010, and 1-3 parts of silicone.

[0007] Furthermore, the preparation method of the microsphere foaming agent comprises the following steps: D1, mixing styrene-butadiene block copolymer, sodium lauryl sulfate, potassium persulfate and deionized water to obtain a core emulsion; D2, add methyl methacrylate dropwise to the core emulsion, stir for the first time, then add the mixed monomer dropwise, stir for the second time, add 1 / 2 of potassium persulfate each time, cool to room temperature, wash with ethanol, centrifuge, and dry in vacuo at 60°C to obtain microspheres; D3. After the microspheres are treated with supercritical CO2, they are transferred to a foaming furnace for gradient temperature foaming and cooled to room temperature to obtain a microsphere foaming agent.

[0008] Furthermore, in step D1, the mass ratio of the styrene-butadiene block copolymer, sodium lauryl sulfate, potassium persulfate, and deionized water is 1:0.02-0.04:0.003-0.005:3.1-3.5; and the mixing refers to heating to 73-77° C. and reacting for 5-6 hours.

[0009] Furthermore, in step D2, the mass ratio of the emulsion, methyl methacrylate, mixed monomer, and potassium peroxodisulfate is 10-11:2.3-2.7:2.3-2.7:0.05-0.06; the dropping rate of the methyl methacrylate is 0.5-1.5 drops / s; the first stirring refers to stirring at 78-82°C and 150-250 rpm for 1.8-2.2 hours; the mixed monomer is obtained by mixing methyl methacrylate and glycidyl methacrylate in a mass ratio of 4.8-5.2:1-1.2, and the dropping rate is 1-2 drops / s; the second stirring is stirring at 80-84°C and 100-200 rpm for 2.3-2.7 hours.

[0010] Furthermore, the supercritical CO2 treatment in step D3 refers to introducing CO2 to 10MPa and treating at 40°C for 4-5h; the gradient temperature rising foaming refers to heating to 98-102°C at a heating rate of 2.5-3.5°C / min, keeping warm for 8-12min, and then heating to 148-152°C at a heating rate of 0.5-1.5°C / min, and keeping warm for 4-6min.

[0011] Furthermore, the raw materials of the buffer inner layer include, by weight, 95-105 parts of methyl vinyl silicone rubber, 28-32 parts of white carbon black, 2.1-2.5 parts of γ-aminopropyltriethoxysilane, 1.3-1.7 parts of dicumyl peroxide, and 3-3.4 parts of silicone.

[0012] Furthermore, the raw materials of the impact-resistant insulating layer include, by weight, 100-110 parts of low-density polyethylene, 0.05-0.09 parts of nano-silicon dioxide, 13-17 parts of aluminum hydroxide, 2-3 parts of dicumyl peroxide, 0.5-0.7 parts of antioxidant 1010, and 2.1-2.3 parts of silicone.

[0013] Furthermore, the flexible impact-resistant cable is applied to industrial robots.

[0014] Beneficial effects of the present invention: (1) The present invention provides a structure comprising an energy-absorbing outer layer, a buffer inner layer and an impact-resistant insulating layer, wherein the TPU molecular chains of the energy-absorbing outer layer can provide free rotation capability, and the microsphere foaming agent forms elastic micropores in the TPU, which reduces the overall modulus and improves bendability; the use of methyl vinyl silicone rubber in the buffer inner layer imparts high flexibility and resilience, effectively preventing local fracture; the low-density polyethylene in the impact-resistant insulating layer also has good softness and elasticity, while aluminum hydroxide and nano-silicon dioxide form a reinforced network to resist internal deformation; the interfacial adhesion of each layer of material is enhanced by silicone to form a stress transition zone, which can effectively disperse external stress and improve impact resistance, and also provide sufficient softness for the cable, and has good application prospects in industrial robots.

[0015] (2) The present invention introduces a microsphere foaming agent, which uses butadiene-styrene copolymer as a soft core. The soft core can provide instantaneous elastic force when subjected to external pressure, thereby dispersing stress; then methyl methacrylate is introduced to promote the formation of the copolymer and provide a rigid skeleton, and then methyl methacrylate and glycidyl methacrylate are added to further form a shell layer while introducing epoxy groups to enhance the interface bonding force with TPU and adjust the flexibility of the shell layer; on this basis, supercritical treatment is performed to pre-expand the microspheres to prevent them from breaking during subsequent foaming, and then gradient temperature increase is used for foaming to first uniformly expand the microspheres, and then the pore structure is stabilized to prevent collapse, thereby further improving the impact resistance of the cable. DETAILED DESCRIPTION

[0016] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments.

[0017] The styrene-butadiene block copolymers in all the examples and comparative examples of the present invention were purchased from Guangdong Dingxin Polymer Technology Co., Ltd.; sodium lauryl sulfate, potassium peroxodisulfate, and methyl methacrylate were purchased from Sigma-Aldrich (Shanghai) Trading Co., Ltd.; and glycidyl methacrylate was purchased from Shanghai MacLean Biochemical Technology Co., Ltd.

[0018] Example 1 A flexible impact-resistant cable comprises, from the outside to the inside, an energy-absorbing outer layer, a buffer inner layer, and an impact-resistant insulating layer; the mass ratio of the energy-absorbing outer layer, the buffer inner layer, and the impact-resistant insulating layer is 1.5:0.8:1.

[0019] The raw materials of the energy-absorbing outer layer include, by weight, 86 parts of TPU, 8 parts of microsphere foaming agent, 0.6 parts of antioxidant 1010, and 1 part of silicone.

[0020] The preparation method of the microsphere foaming agent comprises the following steps: D1, mixing styrene-butadiene block copolymer, sodium lauryl sulfate, potassium persulfate and deionized water to obtain a core emulsion; D2, add methyl methacrylate dropwise to the core emulsion, stir for the first time, then add the mixed monomer dropwise, stir for the second time, add 1 / 2 of potassium persulfate each time, cool to room temperature, wash with ethanol, centrifuge, and dry in vacuo at 60°C to obtain microspheres; D3. After the microspheres are treated with supercritical CO2, they are transferred to a foaming furnace for gradient temperature foaming and cooled to room temperature to obtain a microsphere foaming agent.

[0021] In step D1, the mass ratio of the styrene-butadiene block copolymer, sodium lauryl sulfate, potassium persulfate, and deionized water is 1:0.02:0.003:3.1; the mixing refers to heating to 73° C. and reacting for 5 hours.

[0022] In step D2, the mass ratio of the emulsion, methyl methacrylate, mixed monomer, and potassium peroxodisulfate is 10:2.3:2.3:0.05; the dropping rate of the methyl methacrylate is 0.5 drops / s; the first stirring refers to stirring at 78°C and 150 rpm for 1.8 hours; the mixed monomer is obtained by mixing methyl methacrylate and glycidyl methacrylate in a mass ratio of 4.8:1, and the dropping rate is 1 drop / s; the second stirring is stirring at 80°C and 100 rpm for 2.3 hours.

[0023] The supercritical CO2 treatment in step D3 refers to the introduction of CO2 to 10 MPa and treatment at 40°C for 4 hours; the gradient temperature rise foaming refers to heating the temperature to 98°C at a heating rate of 2.5°C / min, keeping the temperature for 8 minutes, and then heating the temperature to 148°C at a heating rate of 0.5°C / min, and keeping the temperature for 4 minutes.

[0024] The raw materials of the buffer inner layer include, by weight, 95 parts of methyl vinyl silicone rubber, 28 parts of white carbon black, 2.1 parts of γ-aminopropyltriethoxysilane, 1.3 parts of dicumyl peroxide, and 3 parts of silicone.

[0025] The raw materials of the impact-resistant insulating layer include, by weight, 100 parts of low-density polyethylene, 0.05 parts of nano-silicon dioxide, 13 parts of aluminum hydroxide, 2 parts of dicumyl peroxide, 0.5 parts of antioxidant 1010, and 2.1 parts of silicone.

[0026] The flexible impact-resistant cable is applied to industrial robots.

[0027] Example 2 A flexible impact-resistant cable comprises, from the outside to the inside, an energy-absorbing outer layer, a buffer inner layer, and an impact-resistant insulating layer; the mass ratio of the energy-absorbing outer layer, the buffer inner layer, and the impact-resistant insulating layer is 1.6:0.9:1.1.

[0028] The raw materials of the energy-absorbing outer layer include, by weight, 87 parts of TPU, 9 parts of microsphere foaming agent, 0.7 parts of antioxidant 1010, and 1.5 parts of silicone.

[0029] The preparation method of the microsphere foaming agent comprises the following steps: D1, mixing styrene-butadiene block copolymer, sodium lauryl sulfate, potassium persulfate and deionized water to obtain a core emulsion; D2, add methyl methacrylate dropwise to the core emulsion, stir for the first time, then add the mixed monomer dropwise, stir for the second time, add 1 / 2 of potassium persulfate each time, cool to room temperature, wash with ethanol, centrifuge, and dry in vacuo at 60°C to obtain microspheres; D3. After the microspheres are treated with supercritical CO2, they are transferred to a foaming furnace for gradient temperature foaming and cooled to room temperature to obtain a microsphere foaming agent.

[0030] In step D1, the mass ratio of the styrene-butadiene block copolymer, sodium lauryl sulfate, potassium peroxydisulfate, and deionized water is 1:0.02:0.003:3.2; the mixing refers to heating to 747° C. and reacting for 5.3 hours.

[0031] In step D2, the mass ratio of the emulsion, methyl methacrylate, mixed monomer, and potassium peroxodisulfate is 10.2:2.4:2.4:0.053; the dropping rate of the methyl methacrylate is 0.5 drops / s; the first stirring refers to stirring at 79° C. and 180 rpm for 1.9 hours; the mixed monomer is obtained by mixing methyl methacrylate and glycidyl methacrylate in a mass ratio of 4.9:1.05, and the dropping rate is 1 drop / s; the second stirring is stirring at 81° C. and 120 rpm for 2.4 hours.

[0032] The supercritical CO2 treatment in step D3 refers to the introduction of CO2 to 10 MPa and treatment at 40°C for 4.3 hours; the gradient temperature rise foaming refers to heating the temperature to 99°C at a heating rate of 2.5°C / min, keeping the temperature for 9 minutes, and then heating the temperature to 149°C at a heating rate of 0.5°C / min, and keeping the temperature for 4 minutes.

[0033] The raw materials of the buffer inner layer include, by weight, 98 parts of methyl vinyl silicone rubber, 29 parts of white carbon black, 2.2 parts of γ-aminopropyltriethoxysilane, 1.4 parts of dicumyl peroxide, and 3.1 parts of silicone.

[0034] The raw materials of the impact-resistant insulating layer include, by weight, 102 parts of low-density polyethylene, 0.06 parts of nano-silicon dioxide, 14 parts of aluminum hydroxide, 2.3 parts of dicumyl peroxide, 0.5 parts of antioxidant 1010, and 2.16 parts of silicone.

[0035] The flexible impact-resistant cable is applied to industrial robots.

[0036] Example 3 A flexible impact-resistant cable comprises, from the outside to the inside, an energy-absorbing outer layer, a buffer inner layer, and an impact-resistant insulating layer; the mass ratio of the energy-absorbing outer layer, the buffer inner layer, and the impact-resistant insulating layer is 1.7:1:1.2.

[0037] The raw materials of the energy-absorbing outer layer include, by weight, 88 parts of TPU, 10 parts of microsphere foaming agent, 0.8 parts of antioxidant 1010, and 2 parts of silicone.

[0038] The preparation method of the microsphere foaming agent comprises the following steps: D1, mixing styrene-butadiene block copolymer, sodium lauryl sulfate, potassium persulfate and deionized water to obtain a core emulsion; D2, add methyl methacrylate dropwise to the core emulsion, stir for the first time, then add the mixed monomer dropwise, stir for the second time, add 1 / 2 of potassium persulfate each time, cool to room temperature, wash with ethanol, centrifuge, and dry in vacuo at 60°C to obtain microspheres; D3. After the microspheres are treated with supercritical CO2, they are transferred to a foaming furnace for gradient temperature foaming and cooled to room temperature to obtain a microsphere foaming agent.

[0039] In step D1, the mass ratio of the styrene-butadiene block copolymer, sodium lauryl sulfate, potassium peroxydisulfate, and deionized water is 1:0.03:0.004:3.3; the mixing refers to heating to 75° C. and reacting for 5.5 hours.

[0040] In step D2, the mass ratio of the emulsion, methyl methacrylate, mixed monomer, and potassium peroxodisulfate is 10.5:2.5:2.5:0.055; the dropping rate of the methyl methacrylate is 1 drop / s; the first stirring refers to stirring at 80°C and 200 rpm for 2 hours; the mixed monomer is obtained by mixing methyl methacrylate and glycidyl methacrylate in a mass ratio of 5:1.1, and the dropping rate is 1.5 drops / s; the second stirring is stirring at 82°C and 150 rpm for 2.5 hours.

[0041] The supercritical CO2 treatment in step D3 refers to the introduction of CO2 to 10 MPa and treatment at 40°C for 4.5 hours; the gradient temperature rise foaming refers to heating the temperature to 100°C at a heating rate of 3°C / min, keeping the temperature for 10 minutes, and then heating the temperature to 150°C at a heating rate of 1°C / min, and keeping the temperature for 5 minutes.

[0042] The raw materials of the buffer inner layer include, by weight, 100 parts of methyl vinyl silicone rubber, 30 parts of white carbon black, 2.3 parts of γ-aminopropyltriethoxysilane, 1.5 parts of dicumyl peroxide, and 3.2 parts of silicone.

[0043] The raw materials of the impact-resistant insulating layer include, by weight, 105 parts of low-density polyethylene, 0.07 parts of nano-silicon dioxide, 15 parts of aluminum hydroxide, 2.5 parts of dicumyl peroxide, 0.6 parts of antioxidant 1010, and 2.2 parts of silicone.

[0044] The flexible impact-resistant cable is applied to industrial robots.

[0045] Example 4 A flexible impact-resistant cable comprises, from the outside to the inside, an energy-absorbing outer layer, a buffer inner layer, and an impact-resistant insulating layer; the mass ratio of the energy-absorbing outer layer, the buffer inner layer, and the impact-resistant insulating layer is 1.8:1.1:1.3.

[0046] The raw materials of the energy-absorbing outer layer include, by weight, 89 parts of TPU, 11 parts of microsphere foaming agent, 0.9 parts of antioxidant 1010, and 2.8 parts of silicone.

[0047] The preparation method of the microsphere foaming agent comprises the following steps: D1, mixing styrene-butadiene block copolymer, sodium lauryl sulfate, potassium persulfate and deionized water to obtain a core emulsion; D2, add methyl methacrylate dropwise to the core emulsion, stir for the first time, then add the mixed monomer dropwise, stir for the second time, add 1 / 2 of potassium persulfate each time, cool to room temperature, wash with ethanol, centrifuge, and dry in vacuo at 60°C to obtain microspheres; D3. After the microspheres are treated with supercritical CO2, they are transferred to a foaming furnace for gradient temperature foaming and cooled to room temperature to obtain a microsphere foaming agent.

[0048] In step D1, the mass ratio of the styrene-butadiene block copolymer, sodium lauryl sulfate, potassium persulfate, and deionized water is 1:0.04:0.005:3.4; the mixing refers to heating to 76° C. and reacting for 5.7 hours.

[0049] In step D2, the mass ratio of the emulsion, methyl methacrylate, mixed monomer, and potassium peroxodisulfate is 10.8:2.6:2.6:0.057; the dropping rate of the methyl methacrylate is 1.5 drops / s; the first stirring refers to stirring at 81° C. and 230 rpm for 2.1 hours; the mixed monomer is obtained by mixing methyl methacrylate and glycidyl methacrylate in a mass ratio of 5.1:1.13, and the dropping rate is 2 drops / s; the second stirring is stirring at 84° C. and 180 rpm for 2.6 hours.

[0050] The supercritical CO2 treatment in step D3 refers to the introduction of CO2 to 10 MPa and treatment at 40°C for 4.8 hours; the gradient temperature rise foaming refers to heating the temperature to 101°C at a heating rate of 3.5°C / min, keeping the temperature for 11 minutes, and then heating the temperature to 151°C at a heating rate of 1.5°C / min, and keeping the temperature for 6 minutes.

[0051] The raw materials of the buffer inner layer include, by weight, 102 parts of methyl vinyl silicone rubber, 31 parts of white carbon black, 2.4 parts of γ-aminopropyltriethoxysilane, 1.6 parts of dicumyl peroxide, and 3.3 parts of silicone.

[0052] The raw materials of the impact-resistant insulating layer include, by weight, 107 parts of low-density polyethylene, 0.08 parts of nano-silicon dioxide, 16 parts of aluminum hydroxide, 2.7 parts of dicumyl peroxide, 0.7 parts of antioxidant 1010, and 2.24 parts of silicone.

[0053] The flexible impact-resistant cable is applied to industrial robots.

[0054] Example 5 A flexible impact-resistant cable comprises, from the outside to the inside, an energy-absorbing outer layer, a buffer inner layer, and an impact-resistant insulating layer; the mass ratio of the energy-absorbing outer layer, the buffer inner layer, and the impact-resistant insulating layer is 1.9:1.2:1.4.

[0055] The raw materials of the energy-absorbing outer layer include, by weight, 90 parts of TPU, 12 parts of microsphere foaming agent, 1 part of antioxidant 1010, and 3 parts of silicone.

[0056] The preparation method of the microsphere foaming agent comprises the following steps: D1, mixing styrene-butadiene block copolymer, sodium lauryl sulfate, potassium persulfate and deionized water to obtain a core emulsion; D2, add methyl methacrylate dropwise to the core emulsion, stir for the first time, then add the mixed monomer dropwise, stir for the second time, add 1 / 2 of potassium persulfate each time, cool to room temperature, wash with ethanol, centrifuge, and dry in vacuo at 60°C to obtain microspheres; D3. After the microspheres are treated with supercritical CO2, they are transferred to a foaming furnace for gradient temperature foaming and cooled to room temperature to obtain a microsphere foaming agent.

[0057] In step D1, the mass ratio of the styrene-butadiene block copolymer, sodium lauryl sulfate, potassium peroxydisulfate, and deionized water is 1:0.04:0.005:3.5; the mixing refers to heating to 77° C. and reacting for 6 hours.

[0058] In step D2, the mass ratio of the emulsion, methyl methacrylate, mixed monomer, and potassium peroxodisulfate is 11:2.7:2.7:0.06; the dropping rate of the methyl methacrylate is 1.5 drops / s; the first stirring refers to stirring at 82° C. and 250 rpm for 2.2 hours; the mixed monomer is obtained by mixing methyl methacrylate and glycidyl methacrylate in a mass ratio of 5.2:1.2, and the dropping rate is 2 drops / s; the second stirring is stirring at 84° C. and 200 rpm for 2.7 hours.

[0059] The supercritical CO2 treatment in step D3 refers to the introduction of CO2 to 10 MPa and treatment at 40°C for 5 hours; the gradient temperature rise foaming refers to heating the temperature to 102°C at a heating rate of 3.5°C / min, keeping the temperature for 12 minutes, and then heating the temperature to 152°C at a heating rate of 1.5°C / min, and keeping the temperature for 6 minutes.

[0060] The raw materials of the buffer inner layer include, by weight, 105 parts of methyl vinyl silicone rubber, 32 parts of white carbon black, 2.5 parts of γ-aminopropyltriethoxysilane, 1.7 parts of dicumyl peroxide, and 3.4 parts of silicone.

[0061] The raw materials of the impact-resistant insulating layer include, by weight, 110 parts of low-density polyethylene, 0.09 parts of nano-silicon dioxide, 17 parts of aluminum hydroxide, 3 parts of dicumyl peroxide, 0.7 parts of antioxidant 1010, and 2.3 parts of silicone.

[0062] The flexible impact-resistant cable is applied to industrial robots.

[0063] Example 6 On the basis of Example 3, the microsphere foaming agent was removed and replaced with expandable microspheres of equal weight. The expandable microspheres were purchased from Suzhou Zhongsuoxin Import and Export Co., Ltd., model number YYC008. Other conditions remained the same as in Example 3.

[0064] Comparative Example 1 On the basis of Example 3, keeping other conditions unchanged, the cable structure is changed to include a buffer outer layer, an energy-absorbing inner layer, and an impact-resistant insulation layer from the outside to the inside, and the mass ratio of the buffer outer layer, the energy-absorbing inner layer, and the impact-resistant insulation layer is 1.7:1:1.2.

[0065] Comparative Example 2 On the basis of Example 3, keeping other conditions unchanged, the cable structure is changed to include an energy-absorbing outer layer and an impact-resistant insulating layer from the outside to the inside, and the mass ratio of the energy-absorbing outer layer to the impact-resistant insulating layer is 2.8:1.2.

[0066] Comparative Example 3 On the basis of Example 3, keeping other conditions unchanged, the preparation method of the microsphere foaming agent is changed to the following steps: D1, mixing styrene-butadiene block copolymer, sodium lauryl sulfate, potassium persulfate and deionized water to obtain a core emulsion; D2. Methyl methacrylate was added dropwise to the core emulsion at a rate of 1 drop / s, followed by potassium peroxodisulfate. The mixture was stirred at 200 rpm and 80°C for 4.5 h, cooled to room temperature, washed with ethanol, centrifuged, and dried in vacuo at 60°C to obtain microspheres. D3. After the microspheres are treated with supercritical CO2, they are transferred to a foaming furnace for gradient temperature foaming and cooled to room temperature to obtain a microsphere foaming agent.

[0067] Comparative Example 4 On the basis of Example 3, keeping other conditions unchanged, the preparation method of the microsphere foaming agent is changed to the following steps: D1, mixing styrene-butadiene block copolymer, sodium lauryl sulfate, potassium persulfate and deionized water to obtain a core emulsion; D2. Methyl methacrylate and glycidyl methacrylate were added dropwise to the core emulsion at a rate of 1.5 s / drop, followed by potassium peroxodisulfate. The mixture was stirred at 150 rpm and 82°C for 4.5 h, cooled to room temperature, washed with ethanol, centrifuged, and dried in vacuo at 60°C to obtain microspheres. D3. After the microspheres are treated with supercritical CO2, they are transferred to a foaming furnace for gradient temperature foaming, and cooled to room temperature to obtain a microsphere foaming agent.

[0068] Comparative Example 5 On the basis of Example 3, keeping other conditions unchanged, the preparation method of the microsphere foaming agent is changed to the following steps: D1, mixing styrene-butadiene block copolymer, sodium lauryl sulfate, potassium persulfate and deionized water to obtain a core emulsion; D2, add methyl methacrylate dropwise to the core emulsion, stir for the first time, then add the mixed monomer dropwise, stir for the second time, add 1 / 2 of potassium persulfate each time, cool to room temperature, wash with ethanol, centrifuge, and dry in vacuo at 60°C to obtain microspheres; D3. The microspheres are transferred into a foaming furnace for gradient temperature increase and foaming, and then cooled to room temperature to obtain a microsphere foaming agent.

[0069] Comparative Example 6 On the basis of Example 3, keeping other conditions unchanged, the preparation method of the microsphere foaming agent is changed to the following steps: D1, mixing styrene-butadiene block copolymer, sodium lauryl sulfate, potassium persulfate and deionized water to obtain a core emulsion; D2, add methyl methacrylate dropwise to the core emulsion, stir for the first time, then add the mixed monomer dropwise, stir for the second time, add 1 / 2 of potassium persulfate each time, cool to room temperature, wash with ethanol, centrifuge, and dry in vacuo at 60°C to obtain microspheres; D3. After the microspheres are treated with supercritical CO2, they are transferred to a foaming furnace and heated to 150°C at a heating rate of 3°C / min, kept at this temperature for 15 minutes, and cooled to room temperature to obtain a microsphere foaming agent.

[0070] Comparative Example 7 On the basis of Example 3, keeping other conditions unchanged, the preparation method of the microsphere foaming agent is changed to the following steps: D1, mixing styrene-butadiene block copolymer, sodium lauryl sulfate, potassium persulfate and deionized water to obtain a core emulsion; D2, add methyl methacrylate dropwise to the core emulsion, stir for the first time, then add the mixed monomer dropwise, stir for the second time, add 1 / 2 of potassium persulfate each time, cool to room temperature, wash with ethanol, centrifuge, and dry in vacuo at 60°C to obtain microspheres; D3. After the microspheres are treated with supercritical CO2, they are transferred to a foaming furnace, heated to 100°C at a heating rate of 3°C / min, kept warm for 15 minutes, and cooled to room temperature to obtain a microsphere foaming agent.

[0071] The energy-absorbing outer layer, buffer inner layer, and impact-resistant insulating layer prepared in Examples 1-6 and Comparative Examples 1-7 were sequentially extruded on the surface of the armored core, cooled and formed to obtain corresponding cables, which were used as samples; A 50 cm long specimen was mounted on a fixed chuck at one end and on a rotating chuck at the other. A weight of 500 gf (W = 5 N) was suspended from the lower end of the specimen. The rotating chuck was rotated to apply a ±180-degree torsion to the portion of the specimen between the fixed and rotating chucks. The rotating chuck was first rotated +180 degrees, then returned to its original position, then rotated -180 degrees, then returned to its original position. This cycle was repeated at a torsion rate of 30 times / minute, with one torsion in each direction being counted as one. The number of times the specimen was bent under a 500 gf load was measured and recorded as shown in Table 1 below. The impact strength of the samples was tested according to GB / T 1043.1-2008 and the results are shown in Table 1 below.

[0072] As can be seen from Table 1, the flexible impact-resistant cable prepared by the present invention has good impact resistance while maintaining flexibility, and has good application prospects in industrial robots.

[0073] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any indirect 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 flexible impact-resistant cable, characterized in that: The cable comprises an energy-absorbing outer layer, a buffer inner layer, and an impact-resistant insulating layer in sequence from the outside to the inside; the mass ratio of the energy-absorbing outer layer, the buffer inner layer, and the impact-resistant insulating layer is 1.5-1.9:0.8-1.2:1-1.

4.

2. The flexible impact-resistant cable according to claim 1, characterized in that: The raw materials of the energy-absorbing outer layer include, by weight, 86-90 parts of TPU, 8-12 parts of microsphere foaming agent, 0.6-1 part of antioxidant 1010, and 1-3 parts of silicone.

3. The flexible impact-resistant cable according to claim 2, characterized in that: The preparation method of the microsphere foaming agent comprises the following steps: D1, mixing styrene-butadiene block copolymer, sodium lauryl sulfate, potassium persulfate and deionized water to obtain a core emulsion; D2, add methyl methacrylate dropwise to the core emulsion, stir for the first time, then add the mixed monomer dropwise, stir for the second time, add 1 / 2 of potassium persulfate each time, cool to room temperature, wash with ethanol, centrifuge, and dry in vacuo at 60°C to obtain microspheres; D3. After the microspheres are treated with supercritical CO2, they are transferred to a foaming furnace for gradient temperature foaming and cooled to room temperature to obtain a microsphere foaming agent.

4. The flexible impact-resistant cable according to claim 3, characterized in that: In step D1, the mass ratio of the styrene-butadiene block copolymer, sodium lauryl sulfate, potassium peroxydisulfate, and deionized water is 1:0.02-0.04:0.003-0.005:3.1-3.5; the mixing refers to heating to 73-77° C. and reacting for 5-6 hours.

5. The flexible impact-resistant cable according to claim 3, characterized in that: In step D2, the mass ratio of the emulsion, methyl methacrylate, mixed monomer, and potassium peroxodisulfate is 10-11:2.3-2.7:2.3-2.7:0.05-0.06; the drop rate of the methyl methacrylate is 0.5-1.5 drops / s; the first stirring refers to stirring at 78-82°C and 150-250 rpm for 1.8-2.2 hours; the mixed monomer is obtained by mixing methyl methacrylate and glycidyl methacrylate in a mass ratio of 4.8-5.2:1-1.2, and the drop rate is 1-2 drops / s; the second stirring is stirring at 80-84°C and 100-200 rpm for 2.3-2.7 hours.

6. The flexible impact-resistant cable according to claim 3, characterized in that: The supercritical CO2 treatment in step D3 refers to the introduction of CO2 to 10 MPa and treatment at 40°C for 4-5 hours; the gradient temperature rise foaming refers to heating the temperature to 98-102°C at a heating rate of 2.5-3.5°C / min, keeping the temperature for 8-12 minutes, and then heating the temperature to 148-152°C at a heating rate of 0.5-1.5°C / min, and keeping the temperature for 4-6 minutes.

7. The flexible impact-resistant cable according to claim 1, characterized in that: The raw materials of the buffer inner layer include, by weight, 95-105 parts of methyl vinyl silicone rubber, 28-32 parts of white carbon black, 2.1-2.5 parts of gamma-aminopropyltriethoxysilane, 1.3-1.7 parts of dicumyl peroxide, and 3-3.4 parts of silicone.

8. The flexible impact-resistant cable according to claim 1, characterized in that: The raw materials of the impact-resistant insulating layer include, by weight, 100-110 parts of low-density polyethylene, 0.05-0.09 parts of nano-silicon dioxide, 13-17 parts of aluminum hydroxide, 2-3 parts of dicumyl peroxide, 0.5-0.7 parts of antioxidant 1010, and 2.1-2.3 parts of silicone.

9. An application of the flexible impact-resistant cable according to any one of claims 1 to 8, characterized in that: The flexible impact-resistant cable is applied to industrial robots.

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