Heat insulation cable and preparation method thereof

Abstract

The invention relates to the technical field of cable manufacturing, and discloses a heat insulation cable and a preparation method thereof. The cable comprises a cable core, a heat insulation layer, a belting layer and a sheath layer which are sequentially arranged from inside to outside, the cable core comprises a conductor and an insulating layer which are sequentially arranged from inside to outside; the heat insulation layer is made of heat insulation glue; the belting layer is composed of quartz fibers; the sheath layer is composed of porcelain silicone rubber. The heat insulation glue comprises the following components in parts by weight: 80-90 parts of aggregate, 1-3 parts of an anti-agglomeration agent, 5-10 parts of an adhesive, 1-5 parts of a reinforcing phase, 0.1-1 part of a dispersing agent, 0.1-0.5 part of a defoaming agent and 0.1-0.5 part of a thickening agent. The heat insulation layer of the cable is of a porous structure, heat conduction can be effectively prevented, the reinforcing fibers can enable the glue solution to form a three-dimensional net-shaped structure, and the heat insulation effect is improved. The heat insulation layer has the advantages of good heat insulation performance, simple construction, low cost, environmental protection and simple preparation method, and can effectively reduce the working temperature of the cable by coating the cable core with the heat insulation layer.

Description

Technical Field

[0001] The invention relates to the technical field of cable manufacturing, and in particular to a heat-insulated cable and a preparation method thereof. Background Art

[0002] Cables are usually made of several or several groups of wires (at least two in each group) twisted together, similar to ropes. Each group of wires is insulated from each other and often twisted around a center wire with a highly insulating covering on the outside. Cables have the characteristics of being powered inside and insulated outside.

[0003] The wire and cable industry is the second largest industry in China after the automobile industry, with product variety satisfaction and domestic market share exceeding 90%. Globally, China's total output value of wire and cable has surpassed that of the United States, making it the world's largest wire and cable producer. With the rapid development of China's wire and cable industry, the number of new companies has continued to rise, and the overall technical level of the industry has been greatly improved.

[0004] However, most cables are made of organic materials. In high-temperature environments, the insulating materials are affected by the ambient temperature and are easily damaged and fail due to high temperatures. Therefore, the temperature resistance level of the insulating materials limits the use environment of the cables. If there is a heat insulation layer outside the insulating layer, it can block the ambient heat, reduce the internal temperature of the cable, and enable the cable to transmit signals normally.

[0005] Existing cables are mainly composed of PVC plastic particle processed sheath insulation and wire cores made of twisted copper wires of various specifications. The conductor is often covered with PVC insulation. The commonly used PVC insulation has a thermal conductivity of about 0.14W / mk and has a general insulation effect. In the long-term high temperature environment of the distribution room, the temperature of the cable will often rise, which will affect the service life of the cable. When a short circuit occurs, the cable will also spontaneously combust, causing a fire. Summary of the invention

[0006] The purpose of the present invention is to solve the problem that the existing cable insulation fails due to the excessively high temperature of the use environment, and to provide a heat-insulating cable and a preparation method thereof.

[0007] In order to achieve the above-mentioned object, a first aspect of the present invention provides a thermal insulation cable, which comprises a cable core, a thermal insulation layer, a tape layer, and a sheath layer arranged in sequence from the inside to the outside; The cable core includes a conductor and an insulating layer arranged in sequence from the inside to the outside; The heat insulation layer is composed of heat insulation glue; The tape layer is composed of quartz fiber; The sheath layer is composed of porcelain silicone rubber; The thermal insulation adhesive comprises the following components, measured in parts by weight: 80-90 parts of aggregate, 1-3 parts of anti-agglomeration agent, 5-10 parts of adhesive, 1-5 parts of reinforcing phase, 0.1-1 parts of dispersant, 0.1-0.5 parts of defoamer, and 0.1-0.5 parts of thickener.

[0008] Preferably, in the cable core, the conductor is composed of tinned soft round copper stranded wire or silver-plated soft round copper stranded wire, and the insulation layer is composed of FEP or PFA.

[0009] Further preferably, in the thermal insulation adhesive, the aggregate is at least one of power plant floating beads, hollow microspheres, and glass microspheres.

[0010] Preferably, in the thermal insulation adhesive, the anti-agglomeration agent is acrylamide or acetamide.

[0011] Preferably, in the thermal insulation adhesive, the adhesive is silica sol or aluminum sol.

[0012] Preferably, in the thermal insulation adhesive, the reinforcing phase is at least one of glass fiber, quartz fiber and ceramic fiber.

[0013] Further preferably, in the thermal insulation adhesive, the dispersant is at least one of sodium carboxymethyl cellulose, modified acrylic emulsion, water glass, and silica sol.

[0014] More preferably, in the thermal insulation adhesive, the defoaming agent is at least one of dimethyl silicone oil, polyether, and modified siloxane defoaming agents.

[0015] Preferably, in the thermal insulation adhesive, the thickener is a polyurethane thickener or an acrylic thickener.

[0016] According to a particularly preferred embodiment, the method for preparing the thermal insulation adhesive comprises the following steps: S1: Weigh aggregate and anti-agglomeration agent according to the weight ratio, add them into a dispersing device, disperse them for 30 to 60 minutes at a stirring speed of 300 to 500 r / min, mix them evenly, and seal them for storage to obtain a mixed solution I; S2: Weigh the adhesive, dispersant, defoamer and thickener according to the weight ratio, and stir and age them at a stirring speed of 300-500 r / min for 60 minutes to obtain a mixed solution, weigh the reinforcing phase according to the weight ratio, and add it to the mixed solution. After the reinforcing phase softens, first disperse it at a low speed at a speed of 500 r / min. When the reinforcing phase rotates with the mixed solution, adjust the speed to 2000 r / min, stir for 30-45 minutes, and obtain a mixed solution II; S3: placing the mixed solution II in a stirrer with a large torque, and adding the mixed solution I in portions, stirring at a rotation speed of 100 r / min for 30 to 45 minutes to obtain a thermal insulation adhesive.

[0017] The second aspect of the present invention provides a method for preparing the thermally insulated cable according to the first aspect of the present invention, the method comprising the following steps: (1) placing a conductor in a high-temperature extruder, and extruding an insulating layer material outside the conductor to obtain an intermediate I having a conductor-insulating layer structure from inside to outside; (2) placing the intermediate body I in a cage stranding machine, coating the outer layer of the intermediate body I with thermal insulation glue, filling the gaps of the intermediate body I with thermal insulation glue, drying, and then stranding into a cable to obtain an intermediate body II having a structure of intermediate body I-thermal insulation layer from inside to outside; (3) Wrapping a quartz fiber tape around the intermediate II, transferring it to a rubber extruder, and extruding a ceramic silicone rubber around the quartz fiber tape to obtain a heat-insulated cable.

[0018] Preferably, in step (1), the coating thickness of the insulating layer material is 0.2-0.3 mm.

[0019] Further preferably, in step (2), the coating thickness of the outer layer of thermal insulation adhesive of the intermediate I is 1-5 mm.

[0020] Preferably, in step (2), the drying temperature is 60-80° C. and the drying time is 5-10 min.

[0021] Preferably, in step (2), the twisting pitch ratio is 14 to 18 times.

[0022] More preferably, in step (3), the extruded thickness of the ceramic silicone rubber is 1.5-2.0 mm.

[0023] The cable provided by the present invention has at least the following beneficial effects: (1) The cable provided by the present invention is suitable for long-term use at an ambient temperature of 500-600°C; (2) The thermal insulation layer of the cable provided by the present invention is a porous structure, which can effectively prevent heat conduction. The reinforcing fiber therein can form the glue into a three-dimensional mesh structure to improve the thermal insulation effect. The thermal insulation layer has good thermal insulation performance, simple construction, low cost, green and environmental protection, and a simple preparation method. When coated on the outside of the cable core, it can effectively reduce the working temperature of the cable; (3) The cable tape layer provided by the present invention has high temperature resistance and can effectively cover the thermal insulation glue; (4) The sheath layer of the cable provided by the present invention can be vitrified at high temperature, has heat insulation and supporting functions, and can effectively protect the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a cross-sectional view of a thermal insulation cable prepared according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0026] In the present invention, "FEP" means fluorinated ethylene propylene copolymer, and "PFA" is a copolymer of a small amount of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene, also known as soluble polytetrafluoroethylene.

[0027] The present invention will be described in detail below by way of examples. In the following examples, unless otherwise specified, the raw materials are all commercially available.

[0028] Preparation Example 1: This example is used to provide a method for preparing a thermal insulation adhesive, the method comprising the following steps: The heat-insulating adhesive comprises the following components, measured in parts by weight: 90 parts of hollow microspheres, 2 parts of acrylamide, 5 parts of silica sol, 4 parts of glass fiber, 0.1 parts of sodium carboxymethyl cellulose, 0.5 parts of dimethyl silicone oil, and 0.5 parts of polyurethane thickener.

[0029] The preparation method of the thermal insulation adhesive is as follows: S1: hollow microspheres and acrylamide are weighed according to the weight ratio, added into a dispersing device, dispersed for 30 to 60 minutes at a stirring speed of 300 to 500 r / min, mixed evenly, and sealed for storage to obtain a mixed solution I.

[0030] S2: Silica sol, sodium carboxymethyl cellulose, dimethyl silicone oil and polyurethane thickener are weighed in proportion by weight, and stirred and aged for 60 minutes at a stirring speed of 300-500 r / min to obtain a mixed solution. Glass fibers are weighed in proportion by weight and added to the mixed solution. After the glass fibers are softened, they are first dispersed at a low speed of 500 r / min. When the glass fibers rotate with the mixed solution, the speed is adjusted to 2000 r / min and stirred for 30-45 minutes to obtain a mixed solution II.

[0031] S3: placing the mixed solution II in a mixer with a large torque, and adding the mixed solution I in portions, stirring at a rotation speed of 100 r / min for 30 to 45 min to obtain the thermal insulation adhesive I.

[0032] Preparation Example 2: This example is used to provide a method for preparing a thermal insulation adhesive, the method comprising the following steps: The thermal insulation adhesive comprises the following components in parts by weight: 90 parts of power plant floating beads, 2 parts of acetamide, 5 parts of aluminum sol, 1 part of quartz fiber, 0.5 parts of modified acrylic emulsion, 0.3 parts of polyether, and 0.1 parts of acrylic thickener.

[0033] The preparation method of the thermal insulation adhesive is as follows: S1: Weigh the power plant beads and acetamide according to the weight ratio, add them into the dispersion equipment, disperse them for 30 to 60 minutes at a stirring speed of 300 to 500 r / min, mix them evenly, and seal them for storage to obtain a mixed solution I.

[0034] S2: Aluminum sol, modified acrylic emulsion, polyether and acrylic thickener are weighed in proportion by weight, and stirred and aged for 60 minutes at a stirring speed of 300-500 r / min to obtain a mixed solution. Quartz fiber is weighed in proportion by weight and added to the mixed solution. After the quartz fiber is softened, it is first dispersed at a low speed of 500 r / min. When the quartz fiber rotates with the mixed solution, the speed is adjusted to 2000 r / min and stirred for 30-45 minutes to obtain a mixed solution II.

[0035] S3: placing the mixed solution II in a mixer with large torque, adding the mixed solution I in portions, and stirring at a rotation speed of 100 r / min for 30 to 45 min to obtain thermal insulation adhesive II.

[0036] Preparation Example 3: This example is used to provide a method for preparing a thermal insulation adhesive, the method comprising the following steps: The heat-insulating adhesive comprises the following components, measured in parts by weight: 85 parts of glass microspheres, 1 part of acetamide, 7 parts of silica sol, 3 parts of ceramic fibers, 1 part of water glass, 0.1 part of modified siloxane defoaming agent, and 0.3 part of acrylic thickener.

[0037] The preparation method of the thermal insulation adhesive is as follows: S1: Weigh glass microbeads and acetamide according to the weight ratio, add them into a dispersing device, disperse them at a stirring speed of 300-500 r / min for 30-60 min, mix them evenly, and seal them for storage to obtain a mixed solution I.

[0038] S2: Silica sol, water glass, modified siloxane defoamer and acrylic thickener are weighed in proportion by weight, and stirred and aged for 60 minutes at a stirring speed of 300-500 r / min to obtain a mixed solution. Ceramic fibers are weighed in proportion by weight and added to the mixed solution. After the ceramic fibers are softened, they are first dispersed at a low speed of 500 r / min. When the ceramic fibers rotate with the mixed solution, the speed is adjusted to 2000 r / min and stirred for 30-45 minutes to obtain a mixed solution II.

[0039] S3: placing the mixed solution II in a stirrer with a large torque, and adding the mixed solution I in portions, stirring at a rotation speed of 100 r / min for 30 to 45 minutes to obtain the thermal insulation adhesive III.

[0040] Comparative Preparation Example 1: This example is carried out according to the method of Preparation Example 1, except that the thermal insulation adhesive, in parts by weight, includes the following components: 70 parts of hollow microspheres, 10 parts of acrylamide, 15 parts of silica sol, 5 parts of glass fiber, 0.1 parts of sodium carboxymethyl cellulose, 0.5 parts of dimethyl silicone oil, and 0.5 parts of polyurethane thickener, and the remaining steps and parameters are the same as in Example 1; Among them, the obtained thermal insulation glue is recorded as thermal insulation glue IV.

[0041] Comparative Preparation Example 2: This example is carried out according to the method of Preparation Example 1, except that the thermal insulation adhesive, in parts by weight, includes the following components: 82 parts of hollow microspheres, 3 parts of acrylamide, 5 parts of silica sol, 10 parts of glass fiber, 0.1 parts of sodium carboxymethyl cellulose, 0.5 parts of dimethyl silicone oil, and 0.5 parts of polyurethane thickener, and the remaining steps and parameters are the same as in Example 1; The obtained thermal insulation adhesive is recorded as thermal insulation adhesive V.

[0042] Example 1 This example is used to provide a method for preparing a thermal insulation cable, which comprises the following steps: (1) placing three silver-plated soft round copper strands in a high-temperature extruder, and extruding FEP material outside the silver-plated soft round copper strands to obtain three intermediates I-1, I-2, and I-3 having a structure of silver-plated soft round copper strands-FEP insulation layer from inside to outside; the thickness of the FEP insulation layer is 0.2 mm; (2) placing the intermediate I-1, the intermediate I-2, and the intermediate I-3 in a cage stranding machine, coating the outer layers of the intermediate I-1, the intermediate I-2, and the intermediate I-3 with a 2 mm thick thermal insulation glue I, filling the gaps between the intermediate I-1, the intermediate I-2, and the intermediate I-3 with the thermal insulation glue I, and baking at 80°C for 5 minutes, and then stranding them into a cable at a stranding pitch ratio of 16 times to obtain an intermediate II having a structure of intermediate I-insulation layer from inside to outside; the intermediate I includes the intermediate I-1, the intermediate I-2, and the intermediate I-3; (3) Wrapping a quartz fiber tape around the intermediate II, transferring it to a rubber extruder, and extruding a ceramic silicone rubber with a thickness of 1.5 mm around the quartz fiber tape to obtain a heat-insulated cable.

[0043] Among them, Figure 1 As shown, the obtained thermal insulation cable includes a cable core, a thermal insulation layer (thermal insulation glue I), a tape layer (quartz fiber tape), and a sheath layer (ceramic silicone rubber) arranged in sequence from the inside to the outside, and the cable core includes silver-plated soft round copper stranded wire and a FEP insulation layer.

[0044] Example 2 This example is carried out according to the method of Example 1, except that in step (2), the thermal insulation layer is composed of thermal insulation glue II, and the remaining steps and parameters are the same as those of Example 1.

[0045] Example 3 This example is carried out according to the method of Example 1, except that in step (2), the thermal insulation layer is composed of thermal insulation glue III, and the remaining steps and parameters are the same as those of Example 1.

[0046] Comparative Example 1 This example is carried out according to the method of Example 1, except that in step (2), a thermal insulation adhesive I with a thickness of 0.5 mm is coated on the outer layers of the intermediate I-1, the intermediate I-2, and the intermediate I-3, respectively. The remaining steps and parameters are the same as those of Example 1.

[0047] Comparative Example 2 This example is carried out according to the method of Example 1, except that the thermal insulation layer is composed of thermal insulation glue IV, and the remaining steps and parameters are the same as Example 1.

[0048] Comparative Example 3 This example is carried out according to the method of Example 1, except that the thermal insulation layer is composed of thermal insulation glue V, and the remaining steps and parameters are the same as Example 1.

[0049] Test Case The thermal insulation performance of the cables obtained in the above embodiments and comparative examples was tested, and the results are shown in Table 1; Table 1:

[0050] It can be seen from the results in Table 1 that the heat-insulated cable prepared by the method of the present invention has a significantly better heat-insulating effect and can block most of the heat when the ambient temperature is too high, thereby ensuring the normal use of the cable.

[0051] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A thermal insulation cable, characterized in that: The cable includes a cable core, a heat insulation layer, a tape layer, and a sheath layer arranged in sequence from the inside to the outside; The cable core includes a conductor and an insulating layer arranged in sequence from the inside to the outside; The heat insulation layer is composed of heat insulation glue; The tape layer is composed of quartz fiber; The sheath layer is composed of porcelain silicone rubber; The thermal insulation adhesive comprises the following components, measured in parts by weight: 80-90 parts of aggregate, 1-3 parts of anti-agglomeration agent, 5-10 parts of adhesive, 1-5 parts of reinforcing phase, 0.1-1 parts of dispersant, 0.1-0.5 parts of defoamer, and 0.1-0.5 parts of thickener.

2. The cable according to claim 1, wherein In the cable core, the conductor is composed of tinned soft round copper stranded wire or silvered soft round copper stranded wire, and the insulation layer is composed of FEP or PFA.

3. The cable according to claim 1 or 2, wherein: In the thermal insulation adhesive, the aggregate is at least one of power plant floating beads, hollow microspheres, and glass microspheres.

4. The cable according to claim 1 or 2, wherein: In the thermal insulation adhesive, the anti-agglomeration agent is acrylamide or acetamide.

5. The cable according to claim 1 or 2, wherein: In the thermal insulation adhesive, the adhesive is silica sol or aluminum sol.

6. The cable according to claim 1 or 2, wherein: In the thermal insulation adhesive, the reinforcing phase is at least one of glass fiber, quartz fiber and ceramic fiber.

7. The cable according to claim 1 or 2, wherein: In the thermal insulation adhesive, the dispersant is at least one of sodium carboxymethyl cellulose, modified acrylic emulsion, water glass, and silica sol; And / or, in the thermal insulation adhesive, the defoamer is at least one of dimethyl silicone oil, polyether, and modified siloxane defoamers; And / or, in the thermal insulation adhesive, the thickener is a polyurethane thickener or an acrylic thickener.

8. The cable according to claim 1 or 2, wherein: The preparation method of the thermal insulation adhesive comprises the following steps: S1: Weigh aggregate and anti-agglomeration agent according to the weight ratio, add them into a dispersing device, disperse them for 30 to 60 minutes at a stirring speed of 300 to 500 r / min, mix them evenly, and seal them for storage to obtain a mixed solution I; S2: Weigh the adhesive, dispersant, defoamer and thickener according to the weight ratio, and stir and age them at a stirring speed of 300-500 r / min for 60 minutes to obtain a mixed solution, weigh the reinforcing phase according to the weight ratio, and add it to the mixed solution. After the reinforcing phase softens, first disperse it at a low speed at a speed of 500 r / min. When the reinforcing phase rotates with the mixed solution, adjust the speed to 2000 r / min, stir for 30-45 minutes, and obtain a mixed solution II; S3: placing the mixed solution II in a stirrer with a large torque, and adding the mixed solution I in portions, stirring at a rotation speed of 100 r / min for 30 to 45 minutes to obtain a thermal insulation adhesive.

9. A method for preparing a thermally insulated cable according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: (1) placing a conductor in a high-temperature extruder, and extruding an insulating layer material outside the conductor to obtain an intermediate I having a conductor-insulating layer structure from inside to outside; (2) placing the intermediate body I in a cage stranding machine, coating the outer layer of the intermediate body I with thermal insulation glue, filling the gaps of the intermediate body I with thermal insulation glue, drying, and then stranding into a cable to obtain an intermediate body II having a structure of intermediate body I-thermal insulation layer from inside to outside; (3) Wrapping a quartz fiber tape around the intermediate II, transferring it to a rubber extruder, and extruding a ceramic silicone rubber around the quartz fiber tape to obtain a heat-insulated cable.

10. The method according to claim 9, wherein: In step (1), the coating thickness of the insulating layer material is 0.2-0.3 mm; And / or, in step (2), the coating thickness of the outer layer of thermal insulation adhesive of the intermediate I is 1-5 mm; And / or, in step (2), the drying temperature is 60-80°C and the drying time is 5-10 min; And / or, in step (2), the twisting pitch ratio is 14 to 18 times; And / or, in step (3), the extruded thickness of the ceramic silicone rubber is 1.5-2.0 mm.

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