A flame-retardant composite cable material with anti-aging and bending resistance and preparation method thereof

Abstract

The invention discloses an anti-aging, anti-bending flame-retardant composite cable material and a preparation method thereof, and belongs to the field of composite cables. The invention is measured by weight, and the proportions of each component are as follows: 55-68 parts of HDPE, 11-17 parts of CPE, 32-36 parts of EPDM, 6-12 parts of polymer modifier, 5-18 parts of toughening agent, 0.5-3 parts of plasticizer, 2-5 parts of stabilizer, 15-25 parts of filler, 7-15 parts of flame retardant, 0.2-1.5 parts of lubricant, 1.5-2 parts of coupling agent, 0.4-1 parts of antioxidant, and 0.5-1 parts of UV resistance agent. The cable material prepared by the invention uses EPDM as a part of the base material, and adds fillers including carbon black, heavy calcium carbonate and zinc borate, which is conducive to subsequent processing, shortens the processing cycle, and is suitable for large-scale mass production.

Description

Technical Field

[0001] The invention belongs to the field of composite cables, and in particular relates to an anti-aging, bending-resistant flame-retardant composite cable material and a preparation method thereof. Background Art

[0002] Cables are an indispensable means of power and information transmission in modern society, and their performance and quality are of vital importance. In the manufacturing process of cable materials, on the one hand, by selecting a suitable base material, the comprehensive performance of the cable material can be effectively improved; on the other hand, by adding relevant additives during the cable preparation process, the properties of the final cable material product can also be adjusted.

[0003] With the rise of science and technology, cable materials, as an important component of cables, have attracted increasing attention. In order to improve the safety and durability of cable materials, people choose to add flame retardants, anti-aging agents and other related additives, such as aluminum hydroxide, magnesium hydroxide and other substances, in the preparation process of cable materials. Although the addition of these inorganic flame retardants can improve the flame retardant properties of polyethylene cable materials, it will reduce the tensile strength and elongation at break of polyethylene cable materials to a certain extent, thereby limiting the application range of cable materials.

[0004] Heavy calcium carbonate, referred to as heavy calcium carbonate, is a white powder that is non-toxic, odorless and non-irritating. It has the characteristics of high whiteness, high purity, good dispersibility and stability. These characteristics make heavy calcium carbonate have a wide range of application prospects in cable manufacturing. It is worth mentioning that heavy calcium carbonate, as a natural inorganic material, is environmentally friendly and pollution-free. The use of heavy calcium carbonate in the cable manufacturing process can not only improve the performance of the cable, but also meet the current social demand for green and environmentally friendly products. It plays an important role in cable manufacturing. By rationally utilizing the excellent properties of heavy calcium carbonate, the quality and market competitiveness of cable products can be further improved.

[0005] Therefore, how to adjust the flame retardant properties, anti-aging properties and bending resistance of the final cable material by selecting a suitable base material and adding relevant additives such as heavy calcium carbonate during the cable preparation process, while simplifying the processing of the cable material, has become a problem that needs to be solved at present. Summary of the invention

[0006] The first object of the present invention is to provide an anti-aging, anti-bending flame-retardant composite cable material, which has excellent mechanical properties as well as good anti-aging and anti-bending properties.

[0007] The second purpose of the present invention is to propose a method for preparing an anti-aging, bending-resistant flame-retardant composite cable material, provide optimized base material selection and corresponding additive addition, simplify the preparation process, shorten the processing cycle, and be suitable for large-scale mass production.

[0008] In order to solve the above problems, the technical solution adopted by the present invention is as follows:

[0009] The invention discloses an anti-aging, bending-resistant flame-retardant composite cable material. The proportions of each component are as follows, by weight: 55-68 parts of HDPE, 11-17 parts of CPE, 32-36 parts of EPDM, 6-12 parts of polymer modifier, 5-18 parts of toughening agent, 0.5-3 parts of plasticizer, 2-5 parts of stabilizer, 15-25 parts of filler, 7-15 parts of flame retardant, 0.2-1.5 parts of lubricant, 1.5-2 parts of coupling agent, 0.4-1 parts of antioxidant and 0.5-1 parts of anti-UV agent.

[0010] Furthermore, in parts by weight, the proportions of each component are as follows: 58 parts of HDPE, 14 parts of CPE, 32 parts of EPDM, 8 parts of polymer modifier, 9 parts of toughening agent, 1.5 parts of plasticizer, 3 parts of stabilizer, 17 parts of filler, 12 parts of flame retardant, 0.8 parts of lubricant, 1.6 parts of coupling agent, 0.5 parts of antioxidant, and 0.5 parts of anti-UV agent.

[0011] Furthermore, the polymer modifier is nitrile rubber.

[0012] Furthermore, the toughening agent is EVA; and the coupling agent is silane coupling agent KH-550.

[0013] Furthermore, the antioxidant is BHT.

[0014] Furthermore, the plasticizer is selected from one of trioctyl trimellitate and adipic acid polyester.

[0015] Furthermore, the stabilizer is selected from one of barium stearate and dibutyltin dilaurate.

[0016] Furthermore, the filler consists of carbon black, heavy calcium carbonate and zinc borate in a mass ratio of 3:1.2:1.

[0017] Furthermore, the flame retardant is selected from one of aluminum hydroxide, magnesium hydroxide, antimony trioxide and expanded graphite.

[0018] Furthermore, the method for preparing any of the above-mentioned anti-aging, anti-bending flame-retardant composite cable materials comprises the following steps:

[0019] Step 1: Weigh each component raw material according to the formula ratio, add the weighed components raw materials into a high-speed mixer, and stir at 1100 rpm;

[0020] Step 2: After the raw materials of each component in step 1 are uniformly stirred, they are put into an internal mixer and mixed and kneaded at a temperature range of 105-165°C;

[0021] Step 3: After the raw materials are mixed and kneaded in step 2, they are twin-screw extruded, ground and hot-cut to granulate, cooled, and pelletized. After screening through a vibrating screen, they are packaged to obtain an anti-aging, anti-bending flame-retardant composite cable material product.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1) In the present invention, by adding a polymer modifier nitrile rubber to the raw materials and blending it with a base material composed of EPDM, HDPE and CPE, the physical properties of the composite cable material are further improved on the basis that the base material itself has excellent mechanical properties.

[0024] 2) The cable material prepared by the present invention not only has large tensile strength and elongation at break, but also has good flame retardant properties. Even after heat aging treatment, it still has strong tensile strength and elongation at break, and has a wide range of applications.

[0025] 3) The present invention adopts UV-326 and UV-P as anti-ultraviolet agents, and at the same time has good light stability and thermal stability, and also has good applicability with the base material composed of HDPE, CPE and EPDM.

[0026] 4) The base material of the present invention is a mixture of HDPE, CPE and EPDM. On the one hand, it has excellent insulation and mechanical properties, and on the other hand, it can significantly improve the weather resistance and aging resistance of the cable material, making it suitable for various extreme environments.

[0027] 5) The cable material prepared by the present invention uses EPDM as a part of the base material, and adds fillers including carbon black, heavy calcium carbonate and zinc borate, which is beneficial to subsequent processing, shortens the processing cycle, and is suitable for large-scale mass production. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with specific embodiments.

[0029] Unless otherwise specified, the raw materials or reagents used in the following examples are all commercially available products; the equipment or instruments used are all conventional equipment known to those skilled in the art.

[0030] The fillers used in the following examples are carbon black, heavy calcium carbonate and zinc borate in a mass ratio of 3:1.2:1.

[0031] The test methods for the following cable materials are as follows:

[0032] Tensile strength and elongation at break: measured in accordance with the method of GB / T 2951-2008;

[0033] Aging resistance: The obtained cable material is placed in an aging box and treated in air at 180°C for 168 hours, and the test is carried out according to the method of GB / T2951-2008;

[0034] Flame retardant performance: measured in accordance with UL1581; thermal shock test: carried out in accordance with GB / t2951.31;

[0035] Bending strength: The cable material was processed into a 60mm×10mm×4mm strip sample and tested on an XHW-S2000N electronic digital tensile tester with reference to GB / T 9341-2008.

[0036] Example 1

[0037] The invention discloses an anti-aging, bending-resistant flame-retardant composite cable material. The proportions of the components are as follows, by weight: 58 parts of HDPE, 14 parts of CPE, 32 parts of EPDM, 8 parts of nitrile rubber, 9 parts of EVA, 1.5 parts of trioctyl trimellitate, 3 parts of dibutyltin dilaurate, 17 parts of filler, 12 parts of antimony trioxide, 0.8 parts of paraffin, 1.6 parts of silane coupling agent KH-550, 0.5 parts of BHT and 0.5 parts of UV-326.

[0038] The preparation method of the above-mentioned anti-aging, anti-bending flame-retardant composite cable material is as follows:

[0039] Weigh each component raw material according to the formula ratio, add the weighed each component raw material into a high-speed mixer, stir evenly at 1100rpm, put into an internal mixer, mix and knead at a temperature range of 105-165℃, extrude with twin screws, grind and hot-cut granulate, cool to obtain pellets, sieve through a vibrating screen and then package to obtain an anti-aging, bending-resistant and flame-retardant composite cable material product.

[0040] Example 2

[0041] The invention discloses an anti-aging, bending-resistant flame-retardant composite cable material. The proportions of the components are as follows, by weight: 62 parts of HDPE, 17 parts of CPE, 32 parts of EPDM, 8 parts of nitrile rubber, 11 parts of EVA, 2 parts of adipic acid polyester, 2 parts of barium stearate, 20 parts of filler, 15 parts of aluminum hydroxide, 1.2 parts of paraffin, 1.8 parts of silane coupling agent KH-550, 0.8 parts of BHT and 0.6 parts of UV-P.

[0042] The preparation method of the above-mentioned anti-aging, anti-bending flame-retardant composite cable material is as follows:

[0043] Weigh each component raw material according to the formula ratio, add the weighed each component raw material into a high-speed mixer, stir evenly at 1100rpm, put into an internal mixer, mix and knead at a temperature range of 105-165℃, extrude with twin screws, grind and hot-cut granulate, cool to obtain pellets, sieve through a vibrating screen and then package to obtain an anti-aging, bending-resistant and flame-retardant composite cable material product.

[0044] Example 3

[0045] The invention discloses an anti-aging, bending-resistant flame-retardant composite cable material. The proportions of each component are as follows, by weight: 65 parts of HDPE, 13 parts of CPE, 35 parts of EPDM, 12 parts of nitrile rubber, 15 parts of EVA, 2.5 parts of trioctyl trimellitate, 4 parts of dibutyltin dilaurate, 22 parts of filler, 8 parts of magnesium hydroxide, 1 part of paraffin, 1.6 parts of silane coupling agent KH-550, 0.6 parts of BHT and 0.8 parts of UV-326.

[0046] The preparation method of the above-mentioned anti-aging, anti-bending flame-retardant composite cable material is as follows:

[0047] Weigh each component raw material according to the formula ratio, add the weighed each component raw material into a high-speed mixer, stir evenly at 1100rpm, put into an internal mixer, mix and knead at a temperature range of 105-165℃, extrude with twin screws, grind and hot-cut granulate, cool to obtain pellets, sieve through a vibrating screen and then package to obtain an anti-aging, bending-resistant and flame-retardant composite cable material product.

[0048] Example 4

[0049] The invention discloses an anti-aging, bending-resistant flame-retardant composite cable material. The proportions of the components are as follows, by weight: 60 parts of HDPE, 15 parts of CPE, 36 parts of EPDM, 6 parts of nitrile rubber, 5 parts of EVA, 3 parts of adipic acid polyester, 5 parts of dibutyltin dilaurate, 15 parts of filler, 7 parts of antimony trioxide, 0.5 parts of paraffin, 1.5 parts of silane coupling agent KH-550, 0.4 parts of BHT and 1 part of UV-326.

[0050] The preparation method of the above-mentioned anti-aging, anti-bending flame-retardant composite cable material is as follows:

[0051] Weigh each component raw material according to the formula ratio, add the weighed each component raw material into a high-speed mixer, stir evenly at 1100rpm, put into an internal mixer, mix and knead at a temperature range of 105-165℃, extrude with twin screws, grind and hot-cut granulate, cool to obtain pellets, sieve through a vibrating screen and then package to obtain an anti-aging, bending-resistant and flame-retardant composite cable material product.

[0052] Example 5

[0053] The invention discloses an anti-aging, bending-resistant flame-retardant composite cable material. The proportions of the components are as follows, by weight: 68 parts of HDPE, 11 parts of CPE, 33 parts of EPDM, 10 parts of nitrile rubber, 18 parts of EVA, 0.5 parts of trioctyl trimellitate, 2 parts of dibutyltin dilaurate, 25 parts of filler, 10 parts of aluminum hydroxide, 1.5 parts of calcium stearate, 2 parts of silane coupling agent KH-550, 1 part of BHT and 0.7 parts of UV-326.

[0054] The preparation method of the above-mentioned anti-aging, anti-bending flame-retardant composite cable material is as follows:

[0055] Weigh each component raw material according to the formula ratio, add the weighed each component raw material into a high-speed mixer, stir evenly at 1100rpm, put into an internal mixer, mix and knead at a temperature range of 105-165℃, extrude with twin screws, grind and hot-cut granulate, cool to obtain pellets, sieve through a vibrating screen and then package to obtain an anti-aging, bending-resistant and flame-retardant composite cable material product.

[0056] Comparative Example 1

[0057] A cable material, the components and proportions of which are as follows:

[0058] 120 parts of polyvinyl chloride, 11 parts of bisphenol A, 2 parts of epoxidized soybean oil, 3 parts of triethyl citrate, 2 parts of diisooctyl cyclohexane-1,2-dicarboxylate, 7 parts of vinyl acetate copolymer EVA, 5 parts of magnesium hydroxide, and 21 parts of calcium stearate.

[0059] The preparation method of the above-mentioned cable material is as follows: weigh the raw materials in proportion, add polyvinyl chloride into a mixer, and gradually add calcium stearate, epoxy soybean oil, triethyl citrate, and diisooctyl cyclohexane-1,2-dicarboxylate to mix and stir evenly, heat to 95°C at a rate of 6°C / min, then add vinyl acetate copolymer EVA and magnesium hydroxide and continue to stir to 135°C; then discharge the material into another mixer and stir at 900 rpm to cool to 50°C; after cooling, put it into a twin-screw extruder for melt kneading and extrusion at an extrusion temperature of 175°C, cool it, and make it into pellets.

[0060] Comparative Example 2

[0061] A cable material, the components and proportions of which are as follows:

[0062] 75 parts of modified polyethylene, 25 parts of EPDM rubber, 2 parts of epoxidized soybean oil, 7 parts of vinyl acetate copolymer EVA, 12 parts of magnesium hydroxide, 4 parts of zinc borate, 1 part of N,N'-ethylenebisstearamide, 3 parts of 2-hydroxy-4-N-octyloxybenzophenone, and 3 parts of tributylethylene tin.

[0063] The preparation method of the above-mentioned cable material is as follows: raw materials are prepared according to a set weight percentage, and modified polyethylene, ethylene propylene diene monomer rubber, epoxy soybean oil, vinyl acetate copolymer EVA and zinc borate are first added to a mixer and stirred and mixed; wherein the mixer temperature is set to 55°C, the stirring time is 18 minutes, and the stirring speed is 400rad / min; magnesium hydroxide, tributylethylene tin, 2-hydroxy-4-N-octyloxybenzophenone and N,N'-ethylene bisstearamide are added to the mixer and stirred, and the mixer temperature is set to 75°C, the stirring time is 35min, the stirring speed is 600rad / min, and the mixture is evenly mixed; the mixed material is put into a twin-screw extruder for extrusion molding to obtain the cable material.

[0064] The cable materials prepared in the above-mentioned Examples 1-5 and Comparative Examples 1-2 were tested for bending performance, thermal shock performance and flame retardancy, and the results are shown in Table 1 below:

[0065] Table 1 Performance test of cable materials in Examples 1 to 5 and Comparative Examples 1 to 2

[0066]

[0067] The cable materials prepared in the above-mentioned Examples 1 to 5 and Comparative Examples 1 to 2 were tested for aging resistance, and the results are shown in Table 2 below:

[0068] Table 2 Performance test of cable materials in Examples 1 to 5 and Comparative Examples 1 to 2

[0069]

[0070] It can be seen from Table 1 and Table 2 that the anti-aging, bending-resistant flame-retardant composite cable material prepared by the present invention has excellent bending strength, thermal shock resistance, flame retardant performance and aging resistance.

[0071] From the comparison of Examples 1 to 5 with Comparative Examples 1 and 2, it can be seen that the composite cable material prepared by the present invention has better bending strength and aging resistance than those of Comparative Examples 1 and 2; in the raw materials, the present invention further improves the physical properties of the composite cable material by adding a polymer modifier nitrile rubber and blending it with a base material composed of EPDM, HDPE and CPE, on the basis of the excellent mechanical properties of the base material itself.

[0072] The present invention uses carbon black, heavy calcium carbonate and zinc borate in a mass ratio of 3:1.2:1 as fillers. During the compounding process of the cable material, the tensile strength and compressive resistance of the cable material can be enhanced, making the prepared cable material more durable and reliable; and the heavy calcium carbonate, which accounts for about 23% of the filler, also has good lubricity, heat resistance and dispersibility, which can greatly improve the heat resistance of the cable material and extend the service life of the cable in a high temperature environment.

[0073] In the cable material preparation method disclosed in the present invention, due to the addition of a series of related additives such as fillers, the processing fluidity of the cable material can be improved and the production efficiency of the cable material can be increased. Therefore, it is only necessary to add all the raw materials together into a mixing mixer for melt mixing, and then obtain the cable material product through twin-screw extrusion and hot cutting granulation. The complicated process of the traditional cable material preparation method is greatly simplified, which is conducive to large-scale mass production.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An anti-aging, anti-bending flame-retardant composite cable material, characterized in that: In terms of weight, the proportions of each component are as follows: 55~68 parts of HDPE, 11~17 parts of CPE, 32~36 parts of EPDM, 6~12 parts of polymer modifier, 5~18 parts of toughening agent, 0.5~3 parts of plasticizer, 2~5 parts of stabilizer, 15~25 parts of filler, 7~15 parts of flame retardant, 0.2~1.5 parts of lubricant, 1.5~2 parts of coupling agent, 0.4~1 parts of antioxidant, and 0.5~1 parts of anti-UV agent.

2. The anti-aging, bending-resistant flame-retardant composite cable material according to claim 1, characterized in that: In terms of weight, the proportions of each component are as follows: 58 parts of HDPE, 14 parts of CPE, 32 parts of EPDM, 8 parts of polymer modifier, 9 parts of toughening agent, 1.5 parts of plasticizer, 3 parts of stabilizer, 17 parts of filler, 12 parts of flame retardant, 0.8 parts of lubricant, 1.6 parts of coupling agent, 0.5 parts of antioxidant, and 0.5 parts of anti-UV agent.

3. The anti-aging, bending-resistant flame-retardant composite cable material according to claim 1, characterized in that: The polymer modifier is nitrile rubber.

4. The anti-aging, bending-resistant flame-retardant composite cable material according to claim 1, characterized in that: The toughening agent is EVA; the coupling agent is silane coupling agent KH-550.

5. The anti-aging, bending-resistant flame-retardant composite cable material according to claim 1, characterized in that: The antioxidant is BHT.

6. The anti-aging, bending-resistant flame-retardant composite cable material according to claim 1, characterized in that: The plasticizer is selected from one of trioctyl trimellitate and adipic acid polyester.

7. The anti-aging, bending-resistant flame-retardant composite cable material according to claim 1, characterized in that: The stabilizer is selected from one of barium stearate and dibutyltin dilaurate.

8. The anti-aging, bending-resistant flame-retardant composite cable material according to claim 1, characterized in that: The filler consists of carbon black, heavy calcium carbonate and zinc borate in a mass ratio of 3:1.2:

1.

9. The anti-aging, bending-resistant flame-retardant composite cable material according to claim 1, characterized in that: The flame retardant is selected from one of aluminum hydroxide, magnesium hydroxide, antimony trioxide and expanded graphite.

10. A method for preparing the anti-aging, bending-resistant flame-retardant composite cable material according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Weigh each component raw material according to the formula ratio, add the weighed components raw materials into a high-speed mixer, and stir at 1100 rpm; Step 2: After the raw materials of each component in step 1 are uniformly stirred, they are put into an internal mixer and mixed and kneaded at a temperature range of 105-165°C; Step 3: After the raw materials are mixed and kneaded in step 2, they are twin-screw extruded, ground and hot-cut to granulate, cooled, and pelletized. After screening through a vibrating screen, they are packaged to obtain an anti-aging, anti-bending flame-retardant composite cable material product.

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