Anti-aging flame-retardant cable material

Abstract

The anti-aging flame-retardant cable material is prepared from the following raw materials in parts by weight: 100 to 150 parts of polyethylene resin, 20 to 40 parts of ethylene-vinyl acetate copolymer, 12 to 20 parts of flame retardant, 2 to 5 parts of anti-aging agent, 2 to 3 parts of cross-linking agent, 2 to 4 parts of sodium dodecyl benzene sulfonate, 0.5 to 1 part of lubricant, 5 to 10 parts of plasticizer and 1 to 3 parts of calcium stearate. The preparation method comprises the following steps: weighing the raw materials in proportion, and adding the polyvinyl chloride and the ethylene-vinyl acetate copolymer into a high-speed mixer for mixing; gradually adding a flame retardant, an anti-aging agent, a cross-linking agent, sodium dodecyl benzene sulfonate, a lubricant, calcium stearate and a plasticizer, uniformly mixing and stirring, heating and mixing; and after cooling, putting the mixture into a double-screw extruder for melt blending and granulation to obtain the high-temperature-resistant polypropylene composite material. According to the anti-aging flame-retardant cable material provided by the invention, the oxidation resistance and the aging resistance of the cable material are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric wires and cables, and in particular to an anti-aging flame-retardant cable material. Background Art

[0002] With the development of modern society, the use of electrical equipment and cables is becoming increasingly widespread. However, due to the long-term use of wires and cables, they are affected by environmental factors such as high temperature, ultraviolet radiation, and chemicals, which can lead to aging and deterioration of wires and cables, and even cause safety hazards such as fire.

[0003] Cable materials with flame-retardant properties can reduce the spread of flames in the event of a fire, reduce the extent of fire damage, and improve the safety of people and property. Early wire and cable materials mostly used PVC (polyvinyl chloride) as the base material, with large amounts of flame retardants added to improve the flame-retardant properties. However, this material easily produces toxic gases and smoke in a fire, posing a potential threat to human health. With the increasing awareness of environmental protection, higher requirements are placed on the environmental performance of flame-retardant wire and cable materials. Therefore, researchers have begun to look for more environmentally friendly alternative materials, such as low-smoke halogen-free flame-retardant wire and cable materials. Halogen-free flame-retardant wire and cable materials are based on paraffin, paraffin derivatives, inorganic salts, etc., and their flame-retardant properties are enhanced by additives. This material does not produce toxic gases and smoke in the event of a fire, making it more friendly to the environment and human health.

[0004] In addition to flame retardancy, anti-aging properties are also an important development direction for flame-retardant wire and cable materials. As the service life requirements of power equipment and cables become increasingly demanding, R&D personnel have begun to focus on cable materials' antioxidant and UV resistance properties to extend the service life of cables.

[0005] Over the past few decades, the research and development of flame-retardant cable materials has yielded considerable success, but some challenges remain. For example, some traditional flame-retardant cable materials are prone to aging and degradation after prolonged use, shortening the cable's service life. Furthermore, some flame-retardant cable materials offer suboptimal flame retardancy, failing to meet the safety requirements of modern power equipment.

[0006] To address these issues, this patent proposes a new type of anti-aging flame-retardant cable material. This cable can effectively improve the cable material's antioxidant and anti-aging properties, and is widely used in power equipment, communication equipment, construction engineering and other fields, improving the reliability and safety of equipment. Summary of the Invention

[0007] The purpose of the present invention is to provide an anti-aging flame retardant cable material, which effectively improves the anti-oxidation and anti-aging properties of the cable material.

[0008] On the one hand, the present invention provides an anti-aging flame-retardant cable material, which is prepared from raw materials comprising the following components and their weight contents: 100-150 parts of polyethylene resin, 20-40 parts of ethylene-vinyl acetate copolymer, 12-20 parts of flame retardant, 2-5 parts of antioxidant, 2-3 parts of cross-linking agent, 2-4 parts of sodium dodecylbenzene sulfonate, 0.5-1 part of lubricant, 5-10 parts of plasticizer and 1-3 parts of calcium stearate.

[0009] Furthermore, the flame retardant comprises a magnesium hydroxide / expandable graphite composite flame retardant and a modified nano-montmorillonite synergistic flame retardant in a weight ratio of 10:(3-5).

[0010] Furthermore, the preparation method of the magnesium hydroxide / expandable graphite composite flame retardant is a hydrothermal method, which includes the following steps: mixing magnesium hydroxide and expandable graphite in a ratio of 1: (1-1.5) and adding the mixture to a sodium hydroxide aqueous solution with a pH value of 4-5 and stirring thoroughly, wherein the amount ratio of the expandable graphite to the sodium hydroxide aqueous solution is 1g: (10-15)mL; then placing the mixture in a reactor at a temperature of 200-220°C and keeping the mixture warm for 2-4h; finally, cooling the solution, filtering the obtained product, and drying it in a vacuum drying oven at a temperature of 60°C.

[0011] Furthermore, the modified nano-montmorillonite is phosphate-modified nano-montmorillonite, and its preparation steps include: stirring 10-12 parts of bisphenol A-bis(diphenyl phosphate) and 10-15 parts of sodium-montmorillonite at 80-100°C for 20-30 minutes, and then drying under reduced pressure in a vacuum oven at 120°C for 24 hours to obtain phosphate-modified montmorillonite.

[0012] Furthermore, the antioxidant comprises octylated diphenylamine and 2-mercaptobenzimidazole in a mass ratio of (1-2):(2-3).

[0013] Furthermore, the lubricant comprises ethylene bisoleamide, zinc stearate and PE wax in a mass ratio of (1-2): (2-4): (2-3).

[0014] Furthermore, the plasticizer includes one or more of epoxy vegetable oil, dioctyl phthalate and tri-isooctyl trimellitate.

[0015] Furthermore, the plasticizer comprises epoxy vegetable oil, dioctyl phthalate and triisooctyl trimellitate in a mass ratio of 1:(1-2):(1-2).

[0016] Furthermore, the cross-linking agent includes one or more of dicumyl peroxide, benzoyl peroxide, trimethylol triacrylate, and pentaerythritol triacrylate.

[0017] On the other hand, the present invention also provides a preparation method of anti-aging flame-retardant cable material, which comprises the following steps: weighing raw materials in proportion, adding polyvinyl chloride and ethylene-vinyl acetate copolymer into a high-speed mixer, and mixing at 45-60°C for 10-15 minutes; gradually adding flame retardant, antioxidant, crosslinking agent, sodium dodecylbenzene sulfonate, lubricant, calcium stearate and plasticizer, mixing and stirring evenly, heating to 110-120°C at a rate of 5-7°C / min, and kneading for 20-25 minutes; after cooling, placing in a twin-screw extruder for melt blending and granulation, the extrusion temperature is 150-160°C, cooling, and forming pellets.

[0018] The beneficial effects of the present invention are:

[0019] (1) The use of magnesium hydroxide / expandable graphite as a composite flame retardant in the present invention can have a very significant flame retardant effect on the product during the production process, and the flame retardant efficiency is also very high. In addition to being effective in flame retardancy, it can also effectively suppress the generation of some harmful gases. In addition, magnesium hydroxide and expandable graphite will not produce secondary pollution and are harmless to the environment and human body.

[0020] (2) In the present invention, on the basis of using magnesium hydroxide / expandable graphite as a composite flame retardant, modified nano-montmorillonite is also used as a synergistic flame retardant. Modified montmorillonite is a new type of material that is modified from natural montmorillonite by chemical methods. It mainly exists in the form of intercalation, which gives it a large specific surface area and adsorption capacity, and can form a strong bonding effect with the matrix material, thereby improving the mechanical properties of the material. In the composite material, the layered structure of the modified montmorillonite can be embedded with the polymer molecular chain to form a stable intercalation structure, thereby improving the compatibility of the material and enhancing the bonding force between the materials. This structural optimization can significantly improve the mechanical properties of the composite material, including strength, toughness, impact resistance, etc. In addition, the modified montmorillonite can also produce a synergistic effect with the magnesium hydroxide / expandable graphite composite flame retardant during the combustion process. Both magnesium hydroxide and expandable graphite have excellent flame retardant properties, can effectively inhibit combustion and reduce the flame propagation speed. The synergistic effect of modified montmorillonite and these two flame retardants can further increase the carbonization rate and improve the flame retardant properties of the material; this synergistic effect can not only improve the safety performance of the material, but also reduce the release of smoke and toxic gases during combustion.

[0021] (3) The antioxidant in the present invention comprises octylated diphenylamine and 2-mercaptobenzimidazole in a mass ratio of (1-2): (2-3). The octylated diphenylamine and 2-mercaptobenzimidazole can effectively inhibit the oxidation reaction of the material when exposed to high temperature, oxygen, ultraviolet radiation, and the like, thereby delaying the aging process of the material. There is also a synergistic effect between the two, which can mutually enhance the anti-aging effect on the material and improve the antioxidant performance of the material. The use of octylated diphenylamine and 2-mercaptobenzimidazole as a composite antioxidant in the present invention has the advantages of high antioxidant performance, synergistic effect, wide application range, and good thermal stability, and can effectively delay the aging process of the material and improve the service life of the material.

[0022] (4) The present invention selects and matches raw materials and adjusts the preparation process, which not only improves the synergistic effect between the raw materials to a certain extent, but also optimizes the anti-aging and flame retardant properties of the cable material to the maximum extent. DETAILED DESCRIPTION

[0023] The following is a clear and complete description of the technical solution of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0024] Example 1

[0025] This embodiment provides an anti-aging flame-retardant cable material, which is prepared from raw materials containing the following components and their weight percentages: 125 parts of polyethylene resin, 30 parts of ethylene-vinyl acetate copolymer, 16 parts of flame retardant, 3 parts of antioxidant, 2.5 parts of cross-linking agent, 3 parts of sodium dodecylbenzene sulfonate, 0.7 parts of lubricant, 7 parts of plasticizer and 2 parts of calcium stearate;

[0026] The flame retardant comprises a magnesium hydroxide / expandable graphite composite flame retardant and a modified nano-montmorillonite synergistic flame retardant in a weight ratio of 10:4;

[0027] The preparation method of the magnesium hydroxide / expandable graphite composite flame retardant is a hydrothermal method, comprising the following steps: mixing magnesium hydroxide and expandable graphite in a ratio of 1:1.2, adding the mixture to a sodium hydroxide aqueous solution with a pH value of 4-5, and fully stirring, wherein the ratio of the expandable graphite to the sodium hydroxide aqueous solution is 1g:12mL; then placing the mixture in a reactor at a temperature of 210°C and keeping the temperature for 3 hours; finally, cooling the solution, filtering the obtained product, and drying it in a vacuum drying oven at a temperature of 60°C.

[0028] The modified nano-montmorillonite is phosphate-modified nano-montmorillonite, and its preparation steps include: stirring 11 parts of bisphenol A-bis(diphenyl phosphate) and 12 parts of sodium-montmorillonite at 90° C. for 25 minutes, and then drying under reduced pressure in a vacuum oven at 120° C. for 24 hours to obtain phosphate-modified montmorillonite;

[0029] The antioxidant comprises octylated diphenylamine and 2-mercaptobenzimidazole in a mass ratio of 3:5;

[0030] The lubricant comprises ethylene bisoleamide, zinc stearate and PE wax in a mass ratio of 3:6:5;

[0031] The plasticizer includes epoxy vegetable oil; the plasticizer includes epoxy vegetable oil, dioctyl phthalate and triisooctyl trimellitate in a mass ratio of 1:1.5:1.5; the crosslinking agent includes diisopropyl benzene peroxide.

[0032] The preparation method of the polyvinyl chloride cable material in this embodiment includes the following steps: weighing raw materials in proportion, adding polyvinyl chloride and ethylene-vinyl acetate copolymer into a high-speed mixer, and mixing at 50°C for 12 minutes; gradually adding a flame retardant, an antioxidant, a crosslinking agent, sodium dodecylbenzene sulfonate, a lubricant, calcium stearate, and a plasticizer, mixing and stirring uniformly, heating to 115°C at a rate of 6°C / min, and kneading for 22 minutes; after cooling, placing in a twin-screw extruder for melt blending and granulation, the extrusion temperature is 155°C, cooling, and forming pellets.

[0033] Example 2

[0034] This embodiment provides an anti-aging flame-retardant cable material, which is prepared from raw materials containing the following components and their weight percentages: 100 parts of polyethylene resin, 20 parts of ethylene-vinyl acetate copolymer, 12 parts of flame retardant, 2 parts of antioxidant, 2 parts of cross-linking agent, 2 parts of sodium dodecylbenzene sulfonate, 0.5 parts of lubricant, 5 parts of plasticizer and 1 part of calcium stearate;

[0035] The flame retardant comprises a magnesium hydroxide / expandable graphite composite flame retardant and a modified nano-montmorillonite synergistic flame retardant in a weight ratio of 10:(3);

[0036] The preparation method of the magnesium hydroxide / expandable graphite composite flame retardant is a hydrothermal method, comprising the following steps: mixing magnesium hydroxide and expandable graphite in a ratio of 1:(1), adding the mixture to a sodium hydroxide aqueous solution with a pH value of 4-5, and stirring the mixture thoroughly, wherein the ratio of the expandable graphite to the sodium hydroxide aqueous solution is 1g:(10)mL; then placing the mixture in a reactor at a temperature of 200°C and keeping the mixture warm for 2 hours; finally, cooling the solution, filtering the obtained product, and drying the mixture in a vacuum drying oven at a temperature of 60°C.

[0037] The modified nano-montmorillonite is phosphate-modified nano-montmorillonite, and its preparation steps include: stirring 10 parts of bisphenol A-bis(diphenyl phosphate) and 10 parts of sodium-montmorillonite at 80° C. for 20 minutes, and then drying under reduced pressure in a vacuum oven at 120° C. for 24 hours to obtain phosphate-modified montmorillonite;

[0038] The antioxidant comprises octylated diphenylamine and 2-mercaptobenzimidazole in a mass ratio of (1): (2);

[0039] The lubricant comprises ethylene bisoleamide, zinc stearate and PE wax in a mass ratio of (1):(2):(2);

[0040] The plasticizer includes one or more of epoxy vegetable oil, dioctyl phthalate and triisooctyl trimellitate; the plasticizer includes epoxy vegetable oil, dioctyl phthalate and triisooctyl trimellitate in a mass ratio of 1:(1):(1); the crosslinking agent includes one or more of diisopropyl benzene peroxide, benzoyl peroxide, trihydroxymethyl triacrylate and pentaerythritol triacrylate.

[0041] The preparation method of the polyvinyl chloride cable material in this embodiment includes the following steps: weighing raw materials in proportion, adding polyvinyl chloride and ethylene-vinyl acetate copolymer into a high-speed mixer, and mixing at 45°C for 10 minutes; gradually adding a flame retardant, an antioxidant, a crosslinking agent, sodium dodecylbenzene sulfonate, a lubricant, calcium stearate, and a plasticizer, mixing and stirring uniformly, heating to 110°C at a rate of 5°C / min, and kneading for 20 minutes; after cooling, placing in a twin-screw extruder for melt blending and granulation, the extrusion temperature is 150°C, cooling, and forming pellets.

[0042] Example 3

[0043] This embodiment provides an anti-aging flame-retardant cable material, which is prepared from raw materials containing the following components and their weight percentages: 150 parts of polyethylene resin, 40 parts of ethylene-vinyl acetate copolymer, 20 parts of flame retardant, 5 parts of antioxidant, 3 parts of cross-linking agent, 4 parts of sodium dodecylbenzene sulfonate, 1 part of lubricant, 10 parts of plasticizer and 3 parts of calcium stearate;

[0044] The flame retardant comprises a magnesium hydroxide / expandable graphite composite flame retardant and a modified nano-montmorillonite synergistic flame retardant in a weight ratio of 10:(5);

[0045] The preparation method of the magnesium hydroxide / expandable graphite composite flame retardant is a hydrothermal method, comprising the following steps: mixing magnesium hydroxide and expandable graphite in a ratio of 1:(1.5) and adding the mixture to a sodium hydroxide aqueous solution with a pH value of 4-5, wherein the ratio of the expandable graphite to the sodium hydroxide aqueous solution is 1g:(15)mL, and stirring the mixture thoroughly; then placing the mixture in a reactor at a temperature of 220°C and keeping the mixture warm for 4 hours; finally, cooling the solution, filtering the obtained product, and drying the mixture in a vacuum drying oven at a temperature of 60°C to obtain the obtained product;

[0046] The modified nano-montmorillonite is phosphate-modified nano-montmorillonite, and its preparation steps include: stirring 12 parts of bisphenol A-bis(diphenyl phosphate) and 15 parts of sodium-montmorillonite at 100° C. for 30 minutes, and then drying under reduced pressure in a vacuum oven at 120° C. for 24 hours to obtain phosphate-modified montmorillonite;

[0047] The antioxidant comprises octylated diphenylamine and 2-mercaptobenzimidazole in a mass ratio of (2):(3);

[0048] The lubricant comprises ethylene bisoleamide, zinc stearate and PE wax in a mass ratio of (2): (4): (3);

[0049] The plasticizer includes dioctyl phthalate; the plasticizer includes epoxy vegetable oil, dioctyl phthalate and triisooctyl trimellitate in a mass ratio of 1:(2):(2); the crosslinking agent includes pentaerythritol triacrylate.

[0050] The preparation method of the polyvinyl chloride cable material in this embodiment includes the following steps: weighing raw materials in proportion, adding polyvinyl chloride and ethylene-vinyl acetate copolymer into a high-speed mixer, and mixing at 60°C for 15 minutes; gradually adding a flame retardant, an antioxidant, a crosslinking agent, sodium dodecylbenzene sulfonate, a lubricant, calcium stearate, and a plasticizer, mixing and stirring uniformly, heating to 120°C at a rate of 7°C / min, and kneading for 25 minutes; after cooling, placing in a twin-screw extruder for melt blending and granulation, the extrusion temperature is 160°C, cooling, and forming pellets.

[0051] Example 4

[0052] This embodiment provides an anti-aging flame-retardant cable material, which is prepared from raw materials containing the following components and their weight percentages: 100 parts of polyethylene resin, 40 parts of ethylene-vinyl acetate copolymer, 20 parts of flame retardant, 2 parts of antioxidant, 2 parts of cross-linking agent, 4 parts of sodium dodecylbenzene sulfonate, 1 part of lubricant, 10 parts of plasticizer and 3 parts of calcium stearate;

[0053] The flame retardant comprises a magnesium hydroxide / expandable graphite composite flame retardant and a modified nano-montmorillonite synergistic flame retardant in a weight ratio of 10:(3);

[0054] The preparation method of the magnesium hydroxide / expandable graphite composite flame retardant is a hydrothermal method, comprising the following steps: mixing magnesium hydroxide and expandable graphite in a ratio of 1:(1), adding the mixture to a sodium hydroxide aqueous solution with a pH value of 4-5, and fully stirring the mixture, wherein the ratio of the expandable graphite to the sodium hydroxide aqueous solution is 1g:(10)mL; then placing the mixture in a reactor at a temperature of 220°C and keeping the mixture warm for 4 hours; finally, cooling the solution, filtering the obtained product, and drying the mixture in a vacuum drying oven at a temperature of 60°C to obtain the obtained product;

[0055] The modified nano-montmorillonite is phosphate-modified nano-montmorillonite, and its preparation steps include: stirring 12 parts of bisphenol A-bis(diphenyl phosphate) and 10 parts of sodium-montmorillonite at 100° C. for 30 minutes, and then drying under reduced pressure in a vacuum oven at 120° C. for 24 hours to obtain phosphate-modified montmorillonite;

[0056] The antioxidant comprises octylated diphenylamine and 2-mercaptobenzimidazole in a mass ratio of (2):(3);

[0057] The lubricant comprises ethylene bisoleamide, zinc stearate and PE wax in a mass ratio of (2): (2): (3);

[0058] The plasticizer includes one or more of epoxy vegetable oil, dioctyl phthalate and triisooctyl trimellitate; the plasticizer includes epoxy vegetable oil, dioctyl phthalate and triisooctyl trimellitate in a mass ratio of 1:(1):(2); the crosslinking agent includes one or more of diisopropyl benzene peroxide, benzoyl peroxide, trihydroxymethyl triacrylate and pentaerythritol triacrylate.

[0059] The preparation method of the polyvinyl chloride cable material in this embodiment includes the following steps: weighing raw materials in proportion, adding polyvinyl chloride and ethylene-vinyl acetate copolymer into a high-speed mixer, and mixing at 60°C for 15 minutes; gradually adding a flame retardant, an antioxidant, a crosslinking agent, sodium dodecylbenzene sulfonate, a lubricant, calcium stearate, and a plasticizer, mixing and stirring uniformly, heating to 120°C at a rate of 7°C / min, and kneading for 25 minutes; after cooling, placing in a twin-screw extruder for melt blending and granulation, the extrusion temperature is 160°C, cooling, and forming pellets.

[0060] Comparative Example 1

[0061] This embodiment provides an anti-aging flame-retardant cable material, which is prepared from raw materials containing the following components and their weight percentages: 125 parts of polyethylene resin, 30 parts of ethylene-vinyl acetate copolymer, 16 parts of flame retardant, 3 parts of antioxidant, 2.5 parts of cross-linking agent, 3 parts of sodium dodecylbenzene sulfonate, 0.7 parts of lubricant, 7 parts of plasticizer and 2 parts of calcium stearate;

[0062] The flame retardant comprises a magnesium hydroxide / expandable graphite composite flame retardant and a nano-montmorillonite synergistic flame retardant in a weight ratio of 10:4;

[0063] The preparation method of the magnesium hydroxide / expandable graphite composite flame retardant is a hydrothermal method, comprising the following steps: mixing magnesium hydroxide and expandable graphite in a ratio of 1:1.2, adding the mixture to a sodium hydroxide aqueous solution with a pH value of 4-5, and fully stirring, wherein the ratio of the expandable graphite to the sodium hydroxide aqueous solution is 1g:12mL; then placing the mixture in a reactor at a temperature of 210°C and keeping the temperature for 3 hours; finally, cooling the solution, filtering the obtained product, and drying it in a vacuum drying oven at a temperature of 60°C.

[0064] The nano-montmorillonite is sodium-montmorillonite;

[0065] The antioxidant includes octylated diphenylamine and 2-mercaptobenzimidazole in a mass ratio of 3:5;

[0066] The lubricant comprises ethylene bisoleamide, zinc stearate and PE wax in a mass ratio of 3:6:5;

[0067] The plasticizer includes epoxy vegetable oil; the plasticizer includes epoxy vegetable oil, dioctyl phthalate and triisooctyl trimellitate in a mass ratio of 1:1.5:1.5; the crosslinking agent includes diisopropyl benzene peroxide.

[0068] The preparation method of the polyvinyl chloride cable material in this embodiment includes the following steps: weighing raw materials in proportion, adding polyvinyl chloride and ethylene-vinyl acetate copolymer into a high-speed mixer, and mixing at 50°C for 12 minutes; gradually adding a flame retardant, an antioxidant, a crosslinking agent, sodium dodecylbenzene sulfonate, a lubricant, calcium stearate, and a plasticizer, mixing and stirring uniformly, heating to 115°C at a rate of 6°C / min, and kneading for 22 minutes; after cooling, placing in a twin-screw extruder for melt blending and granulation, the extrusion temperature is 155°C, cooling, and forming pellets.

[0069] Comparative Example 2

[0070] This embodiment provides an anti-aging flame-retardant cable material, which is prepared from raw materials containing the following components and their weight percentages: 125 parts of polyethylene resin, 30 parts of ethylene-vinyl acetate copolymer, 16 parts of flame retardant, 3 parts of antioxidant, 2.5 parts of cross-linking agent, 3 parts of sodium dodecylbenzene sulfonate, 0.7 parts of lubricant, 7 parts of plasticizer and 2 parts of calcium stearate;

[0071] Wherein, the flame retardant comprises a magnesium hydroxide / expandable graphite composite flame retardant in a weight ratio of 10:4;

[0072] The preparation method of the magnesium hydroxide / expandable graphite composite flame retardant is a hydrothermal method, comprising the following steps: mixing magnesium hydroxide and expandable graphite in a ratio of 1:1.2, adding the mixture to a sodium hydroxide aqueous solution with a pH value of 4-5, and fully stirring, wherein the ratio of the expandable graphite to the sodium hydroxide aqueous solution is 1g:12mL; then placing the mixture in a reactor at a temperature of 210°C and keeping the temperature for 3 hours; finally, cooling the solution, filtering the obtained product, and drying it in a vacuum drying oven at a temperature of 60°C.

[0073] The antioxidant includes octylated diphenylamine and 2-mercaptobenzimidazole in a mass ratio of 3:5;

[0074] The lubricant comprises ethylene bisoleamide, zinc stearate and PE wax in a mass ratio of 3:6:5;

[0075] The plasticizer includes epoxy vegetable oil; the plasticizer includes epoxy vegetable oil, dioctyl phthalate and triisooctyl trimellitate in a mass ratio of 1:1.5:1.5; the crosslinking agent includes diisopropyl benzene peroxide.

[0076] The preparation method of the polyvinyl chloride cable material in this embodiment includes the following steps: weighing raw materials in proportion, adding polyvinyl chloride and ethylene-vinyl acetate copolymer into a high-speed mixer, and mixing at 50°C for 12 minutes; gradually adding a flame retardant, an antioxidant, a crosslinking agent, sodium dodecylbenzene sulfonate, a lubricant, calcium stearate, and a plasticizer, mixing and stirring uniformly, heating to 115°C at a rate of 6°C / min, and kneading for 22 minutes; after cooling, placing in a twin-screw extruder for melt blending and granulation, the extrusion temperature is 155°C, cooling, and forming pellets.

[0077] Comparative Example 3

[0078] This embodiment provides an anti-aging flame-retardant cable material, which is prepared from raw materials containing the following components and their weight percentages: 125 parts of polyethylene resin, 30 parts of ethylene-vinyl acetate copolymer, 16 parts of flame retardant, 3 parts of antioxidant, 2.5 parts of cross-linking agent, 3 parts of sodium dodecylbenzene sulfonate, 0.7 parts of lubricant, 7 parts of plasticizer and 2 parts of calcium stearate;

[0079] The flame retardant comprises a magnesium hydroxide flame retardant and a modified nano-montmorillonite synergistic flame retardant in a weight ratio of 10:4;

[0080] The modified nano-montmorillonite is phosphate-modified nano-montmorillonite, and its preparation steps include: stirring 11 parts of bisphenol A-bis(diphenyl phosphate) and 12 parts of sodium-montmorillonite at 90° C. for 25 minutes, and then drying under reduced pressure in a vacuum oven at 120° C. for 24 hours to obtain phosphate-modified montmorillonite;

[0081] The antioxidant includes octylated diphenylamine and 2-mercaptobenzimidazole in a mass ratio of 3:5;

[0082] The lubricant comprises ethylene bisoleamide, zinc stearate and PE wax in a mass ratio of 3:6:5;

[0083] The plasticizer includes epoxy vegetable oil; the plasticizer includes epoxy vegetable oil, dioctyl phthalate and triisooctyl trimellitate in a mass ratio of 1:1.5:1.5; the crosslinking agent includes diisopropyl benzene peroxide.

[0084] The preparation method of the polyvinyl chloride cable material in this embodiment includes the following steps: weighing raw materials in proportion, adding polyvinyl chloride and ethylene-vinyl acetate copolymer into a high-speed mixer, and mixing at 50°C for 12 minutes; gradually adding a flame retardant, an antioxidant, a crosslinking agent, sodium dodecylbenzene sulfonate, a lubricant, calcium stearate, and a plasticizer, mixing and stirring uniformly, heating to 115°C at a rate of 6°C / min, and kneading for 22 minutes; after cooling, placing in a twin-screw extruder for melt blending and granulation, the extrusion temperature is 155°C, cooling, and forming pellets.

[0085] Comparative Example 4

[0086] This embodiment provides an anti-aging flame-retardant cable material, which is prepared from raw materials containing the following components and their weight percentages: 125 parts of polyethylene resin, 30 parts of ethylene-vinyl acetate copolymer, 16 parts of flame retardant, 3 parts of antioxidant, 2.5 parts of cross-linking agent, 3 parts of sodium dodecylbenzene sulfonate, 0.7 parts of lubricant, 7 parts of plasticizer and 2 parts of calcium stearate;

[0087] The flame retardant comprises an expandable graphite flame retardant and a modified nano-montmorillonite synergistic flame retardant in a weight ratio of 10:4;

[0088] The modified nano-montmorillonite is phosphate-modified nano-montmorillonite, and its preparation steps include: stirring 11 parts of bisphenol A-bis(diphenyl phosphate) and 12 parts of sodium-montmorillonite at 90° C. for 25 minutes, and then drying under reduced pressure in a vacuum oven at 120° C. for 24 hours to obtain phosphate-modified montmorillonite;

[0089] The antioxidant includes octylated diphenylamine and 2-mercaptobenzimidazole in a mass ratio of 3:5;

[0090] The lubricant comprises ethylene bisoleamide, zinc stearate and PE wax in a mass ratio of 3:6:5;

[0091] The plasticizer includes epoxy vegetable oil; the plasticizer includes epoxy vegetable oil, dioctyl phthalate and triisooctyl trimellitate in a mass ratio of 1:1.5:1.5; the crosslinking agent includes diisopropyl benzene peroxide.

[0092] The preparation method of the polyvinyl chloride cable material in this embodiment includes the following steps: weighing raw materials in proportion, adding polyvinyl chloride and ethylene-vinyl acetate copolymer into a high-speed mixer, and mixing at 50°C for 12 minutes; gradually adding a flame retardant, an antioxidant, a crosslinking agent, sodium dodecylbenzene sulfonate, a lubricant, calcium stearate, and a plasticizer, mixing and stirring uniformly, heating to 115°C at a rate of 6°C / min, and kneading for 22 minutes; after cooling, placing in a twin-screw extruder for melt blending and granulation, the extrusion temperature is 155°C, cooling, and forming pellets.

[0093] Comparative Example 5

[0094] This embodiment provides an anti-aging flame-retardant cable material, which is prepared from raw materials containing the following components and their weight percentages: 125 parts of polyethylene resin, 30 parts of ethylene-vinyl acetate copolymer, 16 parts of flame retardant, 3 parts of antioxidant, 2.5 parts of cross-linking agent, 3 parts of sodium dodecylbenzene sulfonate, 0.7 parts of lubricant, 7 parts of plasticizer and 2 parts of calcium stearate;

[0095] Wherein, the flame retardant includes magnesium hydroxide;

[0096] The antioxidant includes octylated diphenylamine and 2-mercaptobenzimidazole in a mass ratio of 3:5;

[0097] The lubricant comprises ethylene bisoleamide, zinc stearate and PE wax in a mass ratio of 3:6:5;

[0098] The plasticizer includes epoxy vegetable oil; the plasticizer includes epoxy vegetable oil, dioctyl phthalate and triisooctyl trimellitate in a mass ratio of 1:1.5:1.5; the crosslinking agent includes diisopropyl benzene peroxide.

[0099] The preparation method of the polyvinyl chloride cable material in this embodiment includes the following steps: weighing raw materials in proportion, adding polyvinyl chloride and ethylene-vinyl acetate copolymer into a high-speed mixer, and mixing at 50°C for 12 minutes; gradually adding a flame retardant, an antioxidant, a crosslinking agent, sodium dodecylbenzene sulfonate, a lubricant, calcium stearate, and a plasticizer, mixing and stirring uniformly, heating to 115°C at a rate of 6°C / min, and kneading for 22 minutes; after cooling, placing in a twin-screw extruder for melt blending and granulation, the extrusion temperature is 155°C, cooling, and forming pellets.

[0100] Comparative Example 6

[0101] This embodiment provides an anti-aging flame-retardant cable material, which is prepared from raw materials containing the following components and their weight percentages: 125 parts of polyethylene resin, 30 parts of ethylene-vinyl acetate copolymer, 16 parts of flame retardant, 3 parts of antioxidant, 2.5 parts of cross-linking agent, 3 parts of sodium dodecylbenzene sulfonate, 0.7 parts of lubricant, 7 parts of plasticizer and 2 parts of calcium stearate;

[0102] Wherein, the flame retardant comprises expandable graphite;

[0103] The antioxidant comprises octylated diphenylamine and 2-mercaptobenzimidazole in a mass ratio of 3:5;

[0104] The lubricant comprises ethylene bisoleamide, zinc stearate and PE wax in a mass ratio of 3:6:5;

[0105] The plasticizer includes epoxy vegetable oil; the plasticizer includes epoxy vegetable oil, dioctyl phthalate and triisooctyl trimellitate in a mass ratio of 1:1.5:1.5; the crosslinking agent includes diisopropyl benzene peroxide.

[0106] The preparation method of the polyvinyl chloride cable material in this embodiment includes the following steps: weighing raw materials in proportion, adding polyvinyl chloride and ethylene-vinyl acetate copolymer into a high-speed mixer, and mixing at 50°C for 12 minutes; gradually adding a flame retardant, an antioxidant, a crosslinking agent, sodium dodecylbenzene sulfonate, a lubricant, calcium stearate, and a plasticizer, mixing and stirring uniformly, heating to 115°C at a rate of 6°C / min, and kneading for 22 minutes; after cooling, placing in a twin-screw extruder for melt blending and granulation, the extrusion temperature is 155°C, cooling, and forming pellets.

[0107] Comparative Example 7

[0108] This embodiment provides an anti-aging flame-retardant cable material, which is prepared from raw materials containing the following components and their weight percentages: 125 parts of polyethylene resin, 30 parts of ethylene-vinyl acetate copolymer, 16 parts of flame retardant, 3 parts of antioxidant, 2.5 parts of cross-linking agent, 3 parts of sodium dodecylbenzene sulfonate, 0.7 parts of lubricant, 7 parts of plasticizer and 2 parts of calcium stearate;

[0109] The flame retardant comprises a magnesium hydroxide / expandable graphite composite flame retardant and a modified nano-montmorillonite synergistic flame retardant in a weight ratio of 10:4;

[0110] The preparation method of the magnesium hydroxide / expandable graphite composite flame retardant is a hydrothermal method, comprising the following steps: mixing magnesium hydroxide and expandable graphite in a ratio of 1:1.2, adding the mixture to a sodium hydroxide aqueous solution with a pH value of 4-5, and fully stirring, wherein the ratio of the expandable graphite to the sodium hydroxide aqueous solution is 1g:12mL; then placing the mixture in a reactor at a temperature of 210°C and keeping the temperature for 3 hours; finally, cooling the solution, filtering the obtained product, and drying it in a vacuum drying oven at a temperature of 60°C.

[0111] The modified nano-montmorillonite is phosphate-modified nano-montmorillonite, and its preparation steps include: stirring 11 parts of bisphenol A-bis(diphenyl phosphate) and 12 parts of sodium-montmorillonite at 90° C. for 25 minutes, and then drying under reduced pressure in a vacuum oven at 120° C. for 24 hours to obtain phosphate-modified montmorillonite;

[0112] The antioxidant includes octylated diphenylamine;

[0113] The lubricant comprises ethylene bisoleamide, zinc stearate and PE wax in a mass ratio of 3:6:5;

[0114] The plasticizer includes epoxy vegetable oil; the plasticizer includes epoxy vegetable oil, dioctyl phthalate and triisooctyl trimellitate in a mass ratio of 1:1.5:1.5; the crosslinking agent includes diisopropyl benzene peroxide.

[0115] The preparation method of the polyvinyl chloride cable material in this embodiment includes the following steps: weighing raw materials in proportion, adding polyvinyl chloride and ethylene-vinyl acetate copolymer into a high-speed mixer, and mixing at 50°C for 12 minutes; gradually adding a flame retardant, an antioxidant, a crosslinking agent, sodium dodecylbenzene sulfonate, a lubricant, calcium stearate, and a plasticizer, mixing and stirring uniformly, heating to 115°C at a rate of 6°C / min, and kneading for 22 minutes; after cooling, placing in a twin-screw extruder for melt blending and granulation, the extrusion temperature is 155°C, cooling, and forming pellets.

[0116] Comparative Example 8

[0117] This embodiment provides an anti-aging flame-retardant cable material, which is prepared from raw materials containing the following components and their weight percentages: 125 parts of polyethylene resin, 30 parts of ethylene-vinyl acetate copolymer, 16 parts of flame retardant, 3 parts of antioxidant, 2.5 parts of cross-linking agent, 3 parts of sodium dodecylbenzene sulfonate, 0.7 parts of lubricant, 7 parts of plasticizer and 2 parts of calcium stearate;

[0118] The flame retardant comprises a magnesium hydroxide / expandable graphite composite flame retardant and a modified nano-montmorillonite synergistic flame retardant in a weight ratio of 10:4;

[0119] The preparation method of the magnesium hydroxide / expandable graphite composite flame retardant is a hydrothermal method, comprising the following steps: mixing magnesium hydroxide and expandable graphite in a ratio of 1:1.2, adding the mixture to a sodium hydroxide aqueous solution with a pH value of 4-5, and fully stirring, wherein the ratio of the expandable graphite to the sodium hydroxide aqueous solution is 1g:12mL; then placing the mixture in a reactor at a temperature of 210°C and keeping the temperature for 3 hours; finally, cooling the solution, filtering the obtained product, and drying it in a vacuum drying oven at a temperature of 60°C.

[0120] The modified nano-montmorillonite is phosphate-modified nano-montmorillonite, and its preparation steps include: stirring 11 parts of bisphenol A-bis(diphenyl phosphate) and 12 parts of sodium-montmorillonite at 90° C. for 25 minutes, and then drying under reduced pressure in a vacuum oven at 120° C. for 24 hours to obtain phosphate-modified montmorillonite;

[0121] The antioxidant includes 2-mercaptobenzimidazole;

[0122] The lubricant comprises ethylene bisoleamide, zinc stearate and PE wax in a mass ratio of 3:6:5;

[0123] The plasticizer includes epoxy vegetable oil; the plasticizer includes epoxy vegetable oil, dioctyl phthalate and triisooctyl trimellitate in a mass ratio of 1:1.5:1.5; the crosslinking agent includes diisopropyl benzene peroxide.

[0124] The preparation method of the polyvinyl chloride cable material in this embodiment includes the following steps: weighing raw materials in proportion, adding polyvinyl chloride and ethylene-vinyl acetate copolymer into a high-speed mixer, and mixing at 50°C for 12 minutes; gradually adding a flame retardant, an antioxidant, a crosslinking agent, sodium dodecylbenzene sulfonate, a lubricant, calcium stearate, and a plasticizer, mixing and stirring uniformly, heating to 115°C at a rate of 6°C / min, and kneading for 22 minutes; after cooling, placing in a twin-screw extruder for melt blending and granulation, the extrusion temperature is 155°C, cooling, and forming pellets.

[0125] Test Example: The above examples and comparative examples were tested, and the test results are shown in the following table:

[0126]

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. All technical solutions and improvements that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An anti-aging flame retardant cable material, characterized in that: The invention is prepared from raw materials containing the following components and their weight proportions: 100-150 parts of polyethylene resin, 20-40 parts of ethylene-vinyl acetate copolymer, 12-20 parts of flame retardant, 2-5 parts of antioxidant, 2-3 parts of crosslinking agent, 2-4 parts of sodium dodecylbenzene sulfonate, 0.5-1 part of lubricant, 5-10 parts of plasticizer and 1-3 parts of calcium stearate.

2. The anti-aging flame retardant cable material according to claim 1, characterized in that: The flame retardant comprises a magnesium hydroxide / expandable graphite composite flame retardant and a modified nano-montmorillonite synergistic flame retardant in a weight ratio of 10:(3-5).

3. The anti-aging flame retardant cable material according to claim 2, characterized in that: The preparation method of the magnesium hydroxide / expandable graphite composite flame retardant is a hydrothermal method, which includes the following steps: mixing magnesium hydroxide and expandable graphite in a ratio of 1:(1-1.5), adding the mixture to a sodium hydroxide aqueous solution with a pH value of 4-5, and fully stirring the mixture, wherein the ratio of the expandable graphite to the sodium hydroxide aqueous solution is 1g:(10-15)mL; then placing the mixture in a reactor at a temperature of 200-220°C and keeping the mixture warm for 2-4 hours; and finally, cooling the solution, filtering the obtained product, and drying the obtained product in a vacuum drying oven at a temperature of 60°C.

4. The anti-aging flame retardant cable material according to claim 2, characterized in that: The modified nano-montmorillonite is phosphate-modified nano-montmorillonite, and its preparation steps include: stirring 10-12 parts of bisphenol A-bis(diphenyl phosphate) and 10-15 parts of sodium-montmorillonite at 80-100°C for 20-30 minutes, and then drying under reduced pressure in a vacuum oven at 120°C for 24 hours to obtain phosphate-modified montmorillonite.

5. The anti-aging flame-retardant cable material according to claim 1, characterized in that: The antioxidant comprises octylated diphenylamine and 2-mercaptobenzimidazole in a mass ratio of (1-2): (2-3).

6. The anti-aging flame-retardant cable material according to claim 1, characterized in that: The lubricant comprises ethylene bisoleamide, zinc stearate and PE wax in a mass ratio of (1-2): (2-4): (2-3).

7. The anti-aging flame-retardant cable material according to claim 1, characterized in that: The plasticizer includes one or more of epoxy vegetable oil, dioctyl phthalate and tri-isooctyl trimellitate.

8. The anti-aging flame-retardant cable material according to claim 1, characterized in that: The plasticizer comprises epoxy vegetable oil, dioctyl phthalate and triisooctyl trimellitate in a mass ratio of 1:(1-2):(1-2).

9. The anti-aging flame-retardant cable material according to claim 1, characterized in that: The crosslinking agent includes one or more of dicumyl peroxide, benzoyl peroxide, trihydroxymethyl triacrylate, and pentaerythritol triacrylate.

10. A method for preparing an anti-aging flame-retardant cable material according to any one of claims 1 to 9, characterized in that the steps include: The raw materials are weighed in proportion, and polyvinyl chloride and ethylene-vinyl acetate copolymer are added into a high-speed mixer, and mixed at 45-60° C. for 10-15 minutes; flame retardants, antioxidants, crosslinking agents, sodium dodecylbenzene sulfonate, lubricants, calcium stearate and plasticizers are gradually added and mixed and stirred evenly; the temperature is raised to 110-120° C. at a rate of 5-7° C. / min, and the mixture is kneaded for 20-25 minutes; after cooling, the mixture is put into a twin-screw extruder for melt blending and granulation, and the extrusion temperature is 150-160° C., and the mixture is cooled to form pellets.

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