Low-smoke halogen-free high-strength cable material for energy storage cable and preparation method of low-smoke halogen-free high-strength cable material

Abstract

The invention relates to the technical field of cable materials, and provides a low-smoke halogen-free high-strength cable material for an energy storage cable and a preparation method of the low-smoke halogen-free high-strength cable material. The low-smoke halogen-free high-strength cable material for the energy storage cable is prepared from the following raw materials in parts by weight: 60 to 80 parts of ethylene-vinyl acetate, 9 to 12 parts of maleic anhydride grafted ethylene-vinyl acetate, 3 to 5 parts of flame retardant, 1 to 3 parts of lubricant, 1 to 3 parts of antioxidant, 1 to 1.5 parts of hydrogen peroxide, 3 to 6 parts of epoxy amine compound and 20 to 30 parts of filler. According to the technical scheme, the problem of low strength of the cable material in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of cable materials, and in particular to a low-smoke, halogen-free, high-strength cable material for energy storage cables and a preparation method thereof. Background Art

[0002] Energy storage cables are specially designed cables that are used to embed energy storage devices in them to store electrical energy. Such cables usually contain rechargeable batteries or other energy storage devices that can store electrical energy when needed and release electrical energy when needed. Energy storage cables are often used in smart grids, renewable energy systems, and power transmission networks to help balance the instability between power demand and supply. When energy storage systems are arranged inside industrial plants, buildings, or other facilities, the cables may need to pass through different areas and structures, so they need sufficient strength to cope with possible stretching, extrusion, and twisting. In some places with very strict safety requirements, such as nuclear power plants and chemical plants, energy storage cables also need to have high strength to ensure the safety of equipment operation. Therefore, the development of a low-smoke halogen-free cable material with high strength for energy storage cables is an issue that needs to be solved urgently. Summary of the invention

[0003] The present invention provides a low-smoke, halogen-free, high-strength cable material for energy storage cables and a preparation method thereof, which solves the problem of low strength of the cable material in the related art.

[0004] The technical solution of the present invention is as follows: The present invention proposes a low-smoke, halogen-free, high-strength cable material for energy storage cables, comprising the following component raw materials in parts by weight: 60 to 80 parts of ethylene-vinyl acetate, 9 to 12 parts of maleic anhydride grafted ethylene-vinyl acetate, 3 to 5 parts of flame retardant, 1 to 3 parts of lubricant, 1 to 3 parts of antioxidant, 1 to 1.5 parts of hydrogen peroxide, 3 to 6 parts of epoxy amine compounds, and 20 to 30 parts of fillers.

[0005] As a further technical solution, the epoxy amine compound includes one or more of 4-(oxetan-3-yl)aniline, 2,3-dihydro-1,4-benzodioxetan-6-methylamine, and benzo[1,3]dioxol-5-ylmethyl-(tetrahydro-furan-2-ylmethyl)-amine.

[0006] As a further technical solution, the mass ratio of the epoxy amine compound to maleic anhydride grafted ethylene-vinyl acetate is 1:2~3.

[0007] As a further technical solution, the mass ratio of the epoxy amine compound to maleic anhydride grafted ethylene-vinyl acetate is 4:11.

[0008] In the present invention, different types of epoxyamine compounds are used as crosslinking agents, and the desired crosslinking effect and material properties are optimized by controlling the crosslinking degree, thereby obtaining a cable material with the best strength.

[0009] As a further technical solution, the ethylene-vinyl acetate consists of a first ethylene-vinyl acetate and a second ethylene-vinyl acetate, and the first ethylene-vinyl acetate and the second ethylene-vinyl acetate have different haze.

[0010] As a further technical solution, the haze of the first ethylene-vinyl acetate is 5.6%, the haze of the second ethylene-vinyl acetate is 9.4%, and the mass ratio of the first ethylene-vinyl acetate to the second ethylene-vinyl acetate is 1:1-2.

[0011] As a further technical solution, the mass ratio of the first ethylene-vinyl acetate to the second ethylene-vinyl acetate is 1:1.5.

[0012] The present invention uses ethylene-vinyl acetate with different hazes. The haze affects the strength of the material by affecting the uniformity of the internal structure and the molecular arrangement order of the material. Therefore, the present invention obtains a cable material with the best strength by mixing ethylene-vinyl acetate with different hazes.

[0013] As a further technical solution, the flame retardant includes one or both of aluminum hydroxide and magnesium hydroxide.

[0014] As a further technical solution, the lubricant includes one or more of paraffin, pentaerythritol stearate, and stearic acid.

[0015] As a further technical solution, the antioxidant includes one or more of antioxidant 1135 , antioxidant 1076 , and antioxidant 1010 .

[0016] As a further technical solution, the filler includes one or more of bentonite, talcum powder, and mica powder.

[0017] The present invention also provides a method for preparing a low-smoke, halogen-free, high-strength cable material for energy storage cables, comprising the following steps: weighing the raw materials, mixing them evenly, melting, extruding and granulating, and cooling to obtain the low-smoke, halogen-free, high-strength cable material.

[0018] As a further technical solution, the extrusion temperature is 160-190°C.

[0019] The working principle and beneficial effects of the present invention are: In the present invention, epoxy amine compounds are added. The epoxy group is a highly reactive functional group and can undergo a ring-opening reaction with a functional group containing active hydrogen in the raw material, resulting in the rupture of the epoxy group, thereby forming a new chemical bond, promoting the formation of a cross-linked structure, and improving the strength of the cable material; the amine functional group contained in the epoxy amine compound can form a hydrogen bond with the carbonyl group in the raw material, strengthening the internal structure of the material, thereby further improving the strength of the cable material. DETAILED DESCRIPTION

[0020] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In the following examples and comparative examples: First ethylene-vinyl acetate: haze is 5.6%, model is LD 363BW, manufacturer is ExxonMobil Chemical Co., Ltd.; Second ethylene-vinyl acetate: haze is 9.4%, model is Low EVA-00111, manufacturer is ExxonMobil Chemical Co., Ltd.; Maleic anhydride grafted ethylene-vinyl acetate: model 30E671, manufacturer is Dow Chemical Company.

[0022] Example 1 Weigh 60 parts of the first ethylene-vinyl acetate, 9 parts of maleic anhydride grafted ethylene-vinyl acetate, 3 parts of aluminum hydroxide, 1 part of paraffin, 1 part of antioxidant 1135, 6 parts of 4-(oxetan-3-yl)aniline, 1 part of hydrogen peroxide, and 20 parts of bentonite, blend, extrude and granulate through a twin-screw extruder at an extrusion temperature of 160°C to obtain a cable material.

[0023] Example 2 Weigh 70 parts of first ethylene-vinyl acetate, 9 parts of maleic anhydride grafted ethylene-vinyl acetate, 4 parts of aluminum hydroxide, 2 parts of pentaerythritol stearate, 2 parts of antioxidant 1076, 6 parts of 4-(oxetan-3-yl)aniline, 1.2 parts of hydrogen peroxide, and 25 parts of talc, blend, extrude and granulate through a twin-screw extruder at an extrusion temperature of 175°C to obtain a cable material.

[0024] Example 3 Weigh 80 parts of the first ethylene-vinyl acetate, 9 parts of maleic anhydride grafted ethylene-vinyl acetate, 5 parts of magnesium hydroxide, 3 parts of stearic acid, 3 parts of antioxidant 1010, 6 parts of 4-(oxetan-3-yl)aniline, 1.5 parts of hydrogen peroxide, and 30 parts of mica powder, blend, extrude and granulate through a twin-screw extruder at an extrusion temperature of 190°C to obtain a cable material.

[0025] Example 4 Compared with Example 1, the difference of Example 4 is that 6 parts of 4-(oxetan-3-yl)aniline are replaced by an equal amount of 2,3-dihydro-1,4-benzodioxetan-6-methylamine.

[0026] Example 5 Compared with Example 1, Example 5 is different in that 6 parts of 4-(oxetan-3-yl)aniline are replaced by an equal amount of benzo[1,3]dioxol-5-ylmethyl-(tetrahydro-furan-2-ylmethyl)-amine.

[0027] Example 6 Compared with Example 4, the difference of Example 6 is that 6 parts of 2,3-dihydro-1,4-benzodioxetane-6-methylamine and 9 parts of maleic anhydride grafted ethylene-vinyl acetate are replaced with 5 parts of 4-(oxetan-3-yl)aniline and 10 parts of maleic anhydride grafted ethylene-vinyl acetate.

[0028] Example 7 Compared with Example 4, the difference of Example 7 is that 6 parts of 2,3-dihydro-1,4-benzodioxetane-6-methylamine and 9 parts of maleic anhydride grafted ethylene-vinyl acetate are replaced with 4 parts of 4-(oxetan-3-yl)aniline and 11 parts of maleic anhydride grafted ethylene-vinyl acetate.

[0029] Example 8 Compared with Example 4, the difference of Example 8 is that 6 parts of 2,3-dihydro-1,4-benzodioxetane-6-methylamine and 9 parts of maleic anhydride grafted ethylene-vinyl acetate are replaced with 3.75 parts of 4-(oxetan-3-yl)aniline and 11.25 parts of maleic anhydride grafted ethylene-vinyl acetate.

[0030] Example 9 Compared with Example 4, the difference of Example 9 is that 6 parts of 2,3-dihydro-1,4-benzodioxetane-6-methylamine and 9 parts of maleic anhydride grafted ethylene-vinyl acetate are replaced with 3 parts of 4-(oxetan-3-yl)aniline and 12 parts of maleic anhydride grafted ethylene-vinyl acetate.

[0031] Example 10 Compared with Example 7, the difference in Example 10 is that 60 parts of the first ethylene-vinyl acetate are replaced by an equal amount of the second ethylene-vinyl acetate.

[0032] Embodiment 11 Compared with Example 10, Example 11 is different in that 60 parts of the second ethylene-vinyl acetate are replaced with 40 parts of the first ethylene-vinyl acetate and 20 parts of the second ethylene-vinyl acetate.

[0033] Example 12 Compared with Example 10, the difference in Example 12 is that 60 parts of the second ethylene-vinyl acetate are replaced with 30 parts of the first ethylene-vinyl acetate and 30 parts of the second ethylene-vinyl acetate.

[0034] Embodiment 13 Compared with Example 10, Example 13 is different in that 60 parts of the second ethylene-vinyl acetate are replaced with 24 parts of the first ethylene-vinyl acetate and 36 parts of the second ethylene-vinyl acetate.

[0035] Embodiment 14 Compared with Example 10, Example 14 is different in that 60 parts of the second ethylene-vinyl acetate are replaced with 20 parts of the first ethylene-vinyl acetate and 40 parts of the second ethylene-vinyl acetate.

[0036] Embodiment 15 Compared with Example 10, Example 15 is different in that 60 parts of the second ethylene-vinyl acetate are replaced with 15 parts of the first ethylene-vinyl acetate and 45 parts of the second ethylene-vinyl acetate.

[0037] Comparative Example 1 Compared with Example 1, Comparative Example 1 is different in that 4-(oxetan-3-yl)aniline is not added.

[0038] The cable materials prepared in Examples 1 to 15 and Comparative Example 1 were tested according to the following method: 1. Tensile strength: Test the tensile strength of the sample according to the tensile strength test method specified in GB / T 1040.1-2018 "Determination of tensile properties of plastics Part 1: General".

[0039] 2. Tensile fracture strain: According to the tensile fracture strain test method specified in GB / T 1040.1-2018 "Determination of tensile properties of plastics Part 1: General", the tensile fracture strain of the sample is tested.

[0040] The test results are shown in the following table: Table 1 Performance test results of cable materials prepared in Examples 1 to 15 and Comparative Example 1

[0041] Compared with Comparative Example 1, epoxy amine compounds are added to Example 1 and Examples 4-5. As a result, the tensile strength and tensile fracture strain of Example 1 and Examples 4-5 are greater than those of Comparative Example 1, indicating that the addition of epoxy amine compounds can improve the strength of the cable material.

[0042] Compared with Example 1, the epoxy amine compound added in Example 4 is 2,3-dihydro-1,4-benzodioxetane-6-methylamine, and the epoxy amine compound added in Example 5 is benzo[1,3]dioxol-5-ylmethyl-(tetrahydro-furan-2-ylmethyl)-amine. As a result, the tensile strength and tensile fracture strain of Example 4 are greater than those of Examples 1 and 5, indicating that when the added epoxy amine compound is 2,3-dihydro-1,4-benzodioxetane-6-methylamine, the strength of the cable material can be further improved.

[0043] Compared with Example 4, Examples 6 to 9 added different mass ratios of 2,3-dihydro-1,4-benzodioxetine-6-methylamine and maleic anhydride grafted ethylene-vinyl acetate. As a result, the tensile strength and tensile fracture strain of Examples 6 to 8 were greater than those of Examples 4 and 9, indicating that when the mass ratio of 2,3-dihydro-1,4-benzodioxetine-6-methylamine and maleic anhydride grafted ethylene-vinyl acetate is 1:2~3, and the preferred ratio is 4:11, the strength of the obtained cable material is better.

[0044] Compared with Examples 7 and 10, Examples 11 to 15 simultaneously added the first ethylene-vinyl acetate and the second ethylene-vinyl acetate. As a result, the tensile strength and tensile fracture strain of Examples 11 to 15 were greater than those of Examples 7 and 10, indicating that the first ethylene-vinyl acetate and the second ethylene-vinyl acetate play a synergistic role and can further enhance the strength of the cable material.

[0045] Compared with Example 11, Examples 12 to 15 added the first ethylene-vinyl acetate and the second ethylene-vinyl acetate in different mass ratios. As a result, the tensile strength and tensile fracture strain of Examples 12 to 14 were greater than those of Examples 11 and 15, indicating that when the mass ratio of the first ethylene-vinyl acetate and the second ethylene-vinyl acetate is 1:1 to 2, and the preferred ratio is 1:1.5, the strength of the obtained cable material is optimal.

[0046] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A low-smoke, halogen-free, high-strength cable material for energy storage cables, characterized in that: The invention comprises the following raw materials in parts by weight: 60-80 parts of ethylene-vinyl acetate, 9-12 parts of maleic anhydride grafted ethylene-vinyl acetate, 3-5 parts of flame retardant, 1-3 parts of lubricant, 1-3 parts of antioxidant, 1-1.5 parts of hydrogen peroxide, 3-6 parts of epoxyamine compound and 20-30 parts of filler.

2. The low-smoke, halogen-free, high-strength cable material for energy storage cable according to claim 1, characterized in that: The epoxyamine compound includes one or more of 4-(oxetan-3-yl)aniline, 2,3-dihydro-1,4-benzodioxetan-6-methylamine, and benzo[1,3]dioxol-5-ylmethyl-(tetrahydro-furan-2-ylmethyl)-amine.

3. The low-smoke, halogen-free, high-strength cable material for energy storage cable according to claim 1, characterized in that: The mass ratio of the epoxyamine compound to maleic anhydride grafted ethylene-vinyl acetate is 1:2-3.

4. The low-smoke, halogen-free, high-strength cable material for energy storage cable according to claim 1, characterized in that: The ethylene-vinyl acetate consists of a first ethylene-vinyl acetate and a second ethylene-vinyl acetate, and the first ethylene-vinyl acetate and the second ethylene-vinyl acetate have different hazes.

5. The low-smoke, halogen-free, high-strength cable material for energy storage cable according to claim 4, characterized in that: The haze of the first ethylene-vinyl acetate is 5.6%, the haze of the second ethylene-vinyl acetate is 9.4%, and the mass ratio of the first ethylene-vinyl acetate to the second ethylene-vinyl acetate is 1:1-2.

6. The low-smoke, halogen-free, high-strength cable material for energy storage cable according to claim 1, characterized in that: The flame retardant includes one or both of aluminum hydroxide and magnesium hydroxide.

7. The low-smoke, halogen-free, high-strength cable material for energy storage cable according to claim 1, characterized in that: The lubricant includes one or more of paraffin, pentaerythritol stearate, and stearic acid.

8. The low-smoke, halogen-free, high-strength cable material for energy storage cable according to claim 1, characterized in that: The antioxidant includes one or more of antioxidant 1135 , antioxidant 1076 , and antioxidant 1010 .

9. The low-smoke, halogen-free, high-strength cable material for energy storage cable according to claim 1, characterized in that: The filler includes one or more of bentonite, talc powder and mica powder.

10. A method for preparing a low-smoke, halogen-free, high-strength cable material for energy storage cables according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: weighing the raw materials, mixing them uniformly, melting, extruding and granulating, and cooling to obtain low-smoke, halogen-free and high-strength cable materials.

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