A lightweight flexible reel cable

Abstract

The present invention relates to the field of cable technology, and specifically to a lightweight flexible reel cable, comprising an outer sheath, a reinforcement layer, an inner sheath, a mica tape layer, a ground wire and a main line, wherein the apparent density of the inner sheath is ≤0.35g / cm 3 , tensile strength ≥ 3.5MPa. The reel cable containing the inner sheath provided by the present invention is light and high-strength, which can avoid adverse effects on the normal operation of the equipment and the performance of the cable itself due to excessive weight.

Description

Technical Field

[0001] The invention relates to the technical field of cables, in particular to a lightweight flexible reel cable. Background Art

[0002] During use, the existing reel cable is too heavy, which will have an adverse effect on the normal operation of the equipment and the performance of the cable itself. Therefore, how to reduce the weight of the reel cable has become an urgent problem to be solved. Summary of the invention

[0003] Purpose of the invention: In view of the above technical problems, the present invention proposes a lightweight flexible reel cable.

[0004] The technical solutions adopted are as follows:

[0005] A lightweight flexible reel cable comprises an outer sheath, a reinforcement layer, an inner sheath, a mica tape layer, a ground wire and a main wire in sequence;

[0006] The apparent density of the inner sheath is ≤0.35g / cm 3 , tensile strength ≥3.5MPa;

[0007] The inner sheath is made of the following raw materials in parts by weight:

[0008] TPU 60-80 parts, EVA 10-20 parts, EVA-MAH 5-10 parts, nano zinc oxide 1-5 parts, carbon nanotubes 5-10 parts;

[0009] Amino acid salt type ionic liquid is grafted onto the carbon nanotube.

[0010] Furthermore, the preparation method of the carbon nanotubes is as follows:

[0011] 1-Methylimidazole and 3-chloropropyltrimethoxysilane are mixed and heated to 60-80°C for reaction for 24-72 hours to obtain a chloride ionic liquid containing silicon oxygen groups. The chloride ionic liquid is first ion exchanged with potassium hydroxide, and then reacted with amino acids to obtain an amino acid salt-type ionic liquid containing silicon oxygen groups, and finally reacted with hydroxylated carbon nanotubes for grafting.

[0012] Furthermore, the amino acid is any one or more combinations of lysine, glycine and alanine.

[0013] Furthermore, the preparation method of the inner sheath is as follows:

[0014] TPU, EVA, EVA-MAH, nano zinc oxide and carbon nanotubes are mixed and melt-extruded to obtain pellets, and the pellets are made into sheets and then foamed.

[0015] Furthermore, supercritical carbon dioxide is used as a foaming agent and a rapid pressure release method is adopted for foaming.

[0016] Furthermore, the outer sheath is any one or more combinations of PVC, PE, PUR, TPU, CPE, and ceramic silicone rubber.

[0017] Furthermore, the reinforcement layer is an aramid fiber woven mesh.

[0018] Beneficial effects of the present invention:

[0019] The present invention provides a lightweight flexible reel cable. The reinforcement layer arranged between the outer sheath and the inner sheath can effectively improve the anti-torsion performance of the reel cable. The inner sheath made of foamed TPU material has a low apparent density and a high tensile strength, which can not only play a sealing and reinforcing effect, but also can greatly reduce its own weight when used in the reel cable, thereby avoiding adverse effects on the normal operation of the equipment and the performance of the cable itself due to excessive weight.

[0020] EVA has excellent flexibility and impact resistance. After adding it, it can not only combine the excellent properties of TPU and EVA, but also reduce the production cost. Amino acid salt ionic liquid has good CO 2 Adsorption capacity in supercritical CO 2 During foaming, it can promote CO 2 The absorption and diffusion effect in the polymer improves the uniformity of pore formation, increases the foaming efficiency and the mechanical strength of the inner sheath. In addition, its longer alkyl side chain can improve the compatibility between the carbon nanotubes and the polymer matrix, avoid the agglomeration of the carbon nanotubes, better exert its reinforcing effect, and further improve the mechanical properties of the inner sheath. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of a lightweight flexible reel cable provided in the embodiment, in which the reference numerals represent:

[0022] 1-PVC outer sheath, 2-aramid fiber braided mesh reinforcement layer, 3-inner sheath, 4-mica tape layer, 5-ground wire, 6-main wire;

[0023] Figure 2 This is a microscopic morphology of the inner sheath prepared in the example. DETAILED DESCRIPTION

[0024] If the specific conditions are not specified in the examples, the experiments were carried out under conventional conditions or the conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments is not specified, they are all conventional products that can be purchased commercially. The techniques not mentioned in the present invention are all referenced to the prior art. Unless otherwise specified, the following examples and comparative examples are parallel experiments, using the same processing steps and parameters.

[0025] Embodiment 1:

[0026] refer to Figure 1 , this embodiment provides a lightweight flexible reel cable, which includes a PVC outer sheath 1, an aramid fiber braided mesh reinforcement layer 2, an inner sheath 3, a mica tape layer 4, a ground wire 5 and a main wire 6 in sequence;

[0027] Wherein, the preparation method of the inner sheath is as follows:

[0028] ;

[0029] Using acetonitrile as solvent, 1-methylimidazole and 3-chloropropyltrimethoxysilane in a molar ratio of 1:1.05 were mixed and heated to 80°C for 48 hours. The solvent and unreacted raw materials were removed by vacuum distillation. The mixture was cooled and separated with ethyl acetate and dried to obtain a chloride ionic liquid containing siloxy groups. The chloride ionic liquid in a molar ratio of 1:1.05 and potassium hydroxide were added to anhydrous ethanol and ion exchanged at room temperature for 24 hours. The mixture was filtered, potassium chloride was removed, and then vacuum distilled to obtain a hydroxide ionic liquid. Using acetonitrile as solvent, lysine was dissolved in water and reacted with the hydroxide ionic liquid at room temperature for 2 hours under stirring. 4h, the molar ratio of the hydroxyl type ionic liquid to lysine is 1:1.2, and after the reaction is completed, the small molecules are removed by vacuum distillation, and the product is dissolved in a mixed solution of methanol and acetonitrile in a volume ratio of 1:9, and then the unreacted lysine is removed by filtration after standing at low temperature at 5°C for crystallization. The filtrate is vacuum distilled to obtain an amino acid salt type ionic liquid containing a silicon oxygen group, and finally acetonitrile is used as a solvent and a trace amount of sodium hydroxide is used as a catalyst. The amino acid salt type ionic liquid with a mass ratio of 1:20 is reacted with the hydroxylated carbon nanotubes for 5h and then filtered. After the product is dried, the amino acid salt type ionic liquid grafted modified carbon nanotubes can be obtained;

[0030] Weigh the raw materials according to the following weight parts:

[0031] 80 parts of TPU, 15 parts of EVA, 5 parts of EVA-MAH, 3 parts of nano zinc oxide, and 8 parts of amino acid salt type ionic liquid grafted modified carbon nanotubes.

[0032] TPU, EVA, EVA-MAH, nano zinc oxide, and amino acid salt type ionic liquid grafted modified carbon nanotubes were mixed and added into a twin-screw extruder for melt extrusion to obtain pellets. The extrusion temperature was set to 170-210°C. The dried pellets were placed in an injection molding machine for injection molding to obtain sheets. The injection temperature was 190-210°C, the injection pressure was 20±5MPa, and the injection time was 1s. The sheets were placed in a supercritical CO 2 In the autoclave foaming equipment, the supercritical carbon dioxide at 150℃ and 16MPa pressure is maintained for 2h, and the pressure relief valve is opened randomly to quickly release the pressure and foam. The pressure relief time is about 2s. Finally, it is cooled and fixed with cold water and dried. Figure 2 It can be seen that the prepared inner sheath has a high cell density and good uniformity.

[0033] Embodiment 2:

[0034] The method is substantially the same as Example 1, except that alanine is used instead of lysine.

[0035] Embodiment 3:

[0036] The same as Example 1, except that glycine is used instead of lysine.

[0037] Embodiment 4:

[0038] The same as Example 1, except that the raw materials were weighed according to the following parts by weight:

[0039] 80 parts of TPU, 10 parts of EVA, 5 parts of EVA-MAH, 3 parts of nano zinc oxide, and 8 parts of amino acid salt type ionic liquid grafted modified carbon nanotubes.

[0040] Embodiment 5:

[0041] The same as Example 1, except that the raw materials were weighed according to the following parts by weight:

[0042] 80 parts of TPU, 20 parts of EVA, 5 parts of EVA-MAH, 3 parts of nano zinc oxide, and 8 parts of amino acid salt type ionic liquid grafted modified carbon nanotubes.

[0043] Comparative Example 1:

[0044] The method is basically the same as Example 1, except that no amino acid salt type ionic liquid is added to graft-modify the carbon nanotubes.

[0045] Comparative Example 2:

[0046] The method is basically the same as Example 1, except that the carbon nanotubes are directly added without undergoing the amino acid salt type ionic liquid grafting modification treatment.

[0047] Comparative Example 3:

[0048] The method is basically the same as Example 1, except that the carbon nanotubes are grafted and modified with a chloride ionic liquid containing silicon oxide groups. The specific method is as follows:

[0049] ;

[0050] Using acetonitrile as solvent, 1-methylimidazole and 3-chloropropyltrimethoxysilane in a molar ratio of 1:1.2 are mixed and heated to 80°C for reaction for 48 hours, and the solvent and unreacted raw materials are removed by distillation under reduced pressure. The mixture is cooled and separated with ethyl acetate and dried to obtain a chloride ionic liquid containing silicon oxygen groups. Using acetonitrile as solvent and a trace amount of sodium hydroxide as catalyst, the chloride ionic liquid containing silicon oxygen groups in a mass ratio of 1:20 is reacted with hydroxylated carbon nanotubes for 5 hours and then filtered. After the product is dried, the chloride ionic liquid grafted modified carbon nanotubes can be obtained.

[0051] Performance testing:

[0052] The inner sheath materials prepared in Examples 1-5 and Comparative Examples 1-3 were made into test specimens;

[0053] The apparent density test is carried out in accordance with GB / T 6343-2009;

[0054] The tensile properties test was carried out in accordance with GB / T 6344-2008, and the tensile rate was (50±5) mm / min;

[0055] The test results are shown in Table 1 below:

[0056] Table 1:

[0057] ;

[0058] As can be seen from Table 1 above, the inner sheath material prepared by the present invention has a lower apparent density and a higher tensile strength, and can be used in a reel cable to greatly reduce its weight, thereby avoiding adverse effects on the normal operation of the equipment and the performance of the cable itself due to excessive weight;

[0059] From the comparison of the data of Example 1 and Comparative Example 1, it can be seen that the addition of amino acid salt type ionic liquid grafted modified carbon nanotubes plays a positive role in reducing the density of the inner sheath material and improving the mechanical properties;

[0060] From the data comparison between comparative example 1 and comparative example 2, it can be seen that the addition of carbon nanotubes will lead to a decrease in the density of the inner sheath material and an improvement in the mechanical properties. As a high-performance material, carbon nanotubes are currently widely used in cable sheaths. Its addition makes the cable sheath tougher and improves the mechanical properties of the cable. It can also significantly improve the wear resistance of the cable sheath and extend the service life of the cable. In addition, it can also improve the fire resistance of the cable, thereby improving the safety of the cable.

[0061] From the comparison of the data of Example 1 and Comparative Example 2, it can be seen that the carbon nanotubes modified by amino acid salt type ionic liquid grafting have a greater reduction in the density of the inner sheath material and a greater improvement in the mechanical properties;

[0062] From the comparison of the data of Example 1 and Comparative Example 3, it can be seen that the modification effect of the carbon nanotubes grafted with the siloxy group-containing chloride salt ionic liquid on the inner sheath material is not as good as that of the carbon nanotubes grafted with the amino acid salt ionic liquid.

[0063] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lightweight flexible reel cable, characterized in that: It includes outer sheath, reinforcement layer, inner sheath, mica tape layer, ground wire and main wire in sequence; The apparent density of the inner sheath is ≤0.35g / cm 3 , tensile strength ≥3.5MPa; The inner sheath is made of the following raw materials in parts by weight: TPU 60-80 parts, EVA 10-20 parts, EVA-MAH 5-10 parts, nano zinc oxide 1-5 parts, carbon nanotubes 5-10 parts; The carbon nanotubes are grafted with amino acid salt type ionic liquids, and the preparation method of the carbon nanotubes is as follows: 1-Methylimidazole and 3-chloropropyltrimethoxysilane are mixed and heated to 60-80°C for reaction for 24-72h to obtain a chloride ionic liquid containing a silicon oxygen group. The chloride ionic liquid is first ion exchanged with potassium hydroxide, and then reacted with amino acids to obtain an amino acid salt type ionic liquid containing a silicon oxygen group, and finally reacted with hydroxylated carbon nanotubes for grafting; The preparation method of the inner sheath is as follows: The TPU, EVA, EVA-MAH, nano zinc oxide and amino acid salt type ionic liquid grafted modified carbon nanotubes are mixed and added into a twin-screw extruder for melt extrusion to obtain pellets. The extrusion temperature is set at 170-210°C. The dried pellets are placed in an injection molding machine for injection molding to form sheets. The injection temperature is 190-210°C, the injection pressure is 20±5MPa, and the injection time is 1s. The sheet is placed in a supercritical CO2 autoclave foaming equipment and maintained at 150°C and 16MPa in supercritical carbon dioxide for 2h. The pressure relief valve is opened for rapid pressure relief and foaming. The pressure relief time is 2s. Finally, it is cooled with cold water to shape and dried.

2. The lightweight flexible reel cable according to claim 1, characterized in that: The amino acids are any one or more combinations of lysine, glycine and alanine.

3. The lightweight flexible reel cable according to claim 1, characterized in that: The preparation method of the inner sheath is as follows: TPU, EVA, EVA-MAH, nano zinc oxide and carbon nanotubes are mixed and melt-extruded to obtain pellets, and the pellets are made into sheets and then foamed.

4. The lightweight flexible reel cable according to claim 3, characterized in that: Supercritical carbon dioxide is used as the foaming agent and the rapid pressure release method is adopted for foaming.

5. The lightweight flexible reel cable according to claim 1, characterized in that: The outer sheath is any one or more combinations of PVC, PE, PUR, TPU, CPE, and ceramic silicone rubber.

6. The lightweight flexible reel cable according to claim 1, characterized in that: The reinforcement layer is an aramid fiber woven mesh.

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