Nano inorganic filler enhanced composite cable insulation material and preparation method thereof

Abstract

The invention relates to a nano inorganic filler enhanced composite cable insulating material and a preparation method thereof, and belongs to the technical field of cables, the cable insulating material comprises the following raw materials: epoxy resin, a composite filler, allyl chloroacetate, 3, 4-epoxy cyclohexyl 3, 4-epoxy cyclohexane formic acid, a curing agent and an accelerant; the composite filler comprises modified montmorillonite, modified hexagonal boron nitride and silica powder. The epoxy resin is selected as a base material, the montmorillonite and the hexagonal boron nitride which have the characteristics of high insulation and high heat conduction are used as main fillers, the silica powder is used as an auxiliary filler, and meanwhile, the montmorillonite and the hexagonal boron nitride are modified by adopting the maltose, the polypropylene glycol and the carboxyl-terminated hyperbranched polyester; besides, allyl chloroacetate is also added to improve the interaction between the filler and a base material, and 3, 4-epoxy cyclohexyl 3, 4-epoxy cyclohexane formic acid is added to effectively inhibit the accumulation of space charges, so that the prepared cable material has excellent insulating property.

Description

Technical Field

[0001] The present invention belongs to the technical field of cables, and in particular relates to a nano-inorganic filler reinforced composite cable insulation material and a preparation method thereof. Background Art

[0002] In today's rapidly developing electrical and electronic fields, cables, as key carriers for transmitting electrical energy and signals, play a crucial role in the stable operation of the entire system. Cable insulation materials, as a core component of cable structures, fulfill multiple critical functions, including isolating current, preventing leakage, and ensuring electrical safety. While traditional cable insulation materials can meet basic insulation requirements to a certain extent, they are gradually exposing numerous limitations in increasingly complex application scenarios. For example, in high-voltage and high-current transmission environments, these materials are prone to electrical breakdown, leading to cable failure. In extreme operating conditions such as high temperature, high humidity, or strong chemical corrosion, their insulation performance also rapidly degrades, shortening the cable's service life. To overcome the shortcomings of traditional cable insulation materials, researchers have begun exploring the use of fillers to improve their performance. However, conventional fillers often suffer from poor dispersibility and poor compatibility with the matrix, making it difficult to effectively enhance the overall performance of the insulation material. Against this backdrop, the application of nano-inorganic fillers has gradually attracted attention.

[0003] While nano-inorganic fillers have shown great potential in composite materials, their application in cable insulation still faces numerous technical challenges. Key issues to be addressed include achieving uniform dispersion of nano-inorganic fillers within the polymer matrix, preventing agglomeration and fully maximizing their nanoscale reinforcing properties, and optimizing the type, dosage, and surface treatment of nano-inorganic fillers to achieve the optimal balance of overall performance.

[0004] Therefore, developing a nano-inorganic filler reinforced composite cable insulation material that can effectively solve the above problems has extremely important practical significance and broad application prospects for improving the insulation performance of cables to meet the current high performance requirements of cables. Summary of the Invention

[0005] The purpose of the present invention is to provide a nano-inorganic filler reinforced composite cable insulation material and a preparation method thereof, which solves the problem of poor insulation in existing cable material technology.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] In a first aspect, the present application provides a nano-inorganic filler reinforced composite cable insulation material, wherein the cable insulation material comprises the following raw materials:

[0008] Epoxy resin, composite filler, propylene chloroacetate, 3,4-epoxycyclohexyl 3,4-epoxycyclohexanecarboxylic acid, curing agent, accelerator.

[0009] As a preferred technical solution of the present invention, the cable insulation material includes 90-100 parts by weight of epoxy resin, 15-25 parts by weight of composite filler, 0.8-1 parts by weight of propylene chloroacetate, 3-3.5 parts by weight of 3,4-epoxycyclohexyl 3,4-epoxycyclohexanecarboxylic acid, 80-85 parts by weight of curing agent and 0.1-0.12 parts by weight of accelerator.

[0010] Furthermore, the epoxy resin includes E-44 epoxy resin.

[0011] As a preferred technical solution of the present invention, the composite filler includes modified montmorillonite, modified hexagonal boron nitride and silicon powder.

[0012] As a preferred technical solution of the present invention, the composite filler includes 5-10 parts by weight of modified montmorillonite, 8-10 parts by weight of modified hexagonal boron nitride, and 2-5 parts by weight of silicon powder.

[0013] As a preferred technical solution of the present invention, the preparation methods of the modified montmorillonite and modified hexagonal boron nitride are:

[0014] A1. Dry the raw material under vacuum at controlled temperature, mix the dried raw material and maltose evenly, and then ball-mill at controlled speed to obtain material A. Mix material A with deionized water under controlled temperature and stir, then filter, wash the filter material, add anhydrous ethanol to form a dispersion, and sonicate. After the anhydrous ethanol evaporates, dry the dispersion under controlled temperature and vacuum, then obtain material B.

[0015] A2, mixing material B, polypropylene glycol, benzyl benzoate, ethanol solution and NaOH solution, and stirring at a controlled speed until the ethanol solution is completely evaporated to obtain material C;

[0016] A3. Add acetone, carboxyl-terminated hyperbranched polyester, potassium hydroxide and 4-methylbenzenesulfonic acid to material C in sequence, stir under controlled temperature, and dry under controlled temperature to obtain a modified raw material.

[0017] As a preferred technical solution of the present invention, the mass ratio of the dried raw material and maltose in step A1 is 1:3-4; the mass ratio of the material A and deionized water is 1:1.5-2.5; and the mass concentration of the dispersion is 20 mg / mL.

[0018] As a preferred technical solution of the present invention, the temperature of the temperature-controlled vacuum drying in step A1 is 55-60°C, and the time is 20-24h; the speed of the speed-controlled ball mill is 500-550r / min, and the time is 5-6h; the temperature of the temperature-controlled mixing and stirring is 75-80°C, and the time is 15-20min; the washing is 3-5 times with deionized water; the time of the ultrasonication is 1.5-2h; the temperature of the temperature-controlled vacuum drying is 65-75°C.

[0019] As a preferred technical solution of the present invention, the concentration of the ethanol solution in step A2 is 70-80wt%, and the concentration of the NaOH solution is 0.5mol / L.

[0020] As a preferred technical solution of the present invention, the mass ratio of material B, polypropylene glycol, benzyl benzoate, ethanol solution and NaOH solution in step A2 is 5-9:5-6:0.05-0.1:35-40:0.015-0.03.

[0021] As a preferred technical solution of the present invention, the speed of the speed control in step A2 is 350-380r / min.

[0022] As a preferred technical solution of the present invention, the usage ratio of material C, acetone, carboxyl-terminated hyperbranched polyester, potassium hydroxide and 4-methylbenzenesulfonic acid in step A3 is 10g:8-10g:0.05-0.06g:15-16mg:0.3-0.4g.

[0023] As a preferred technical solution of the present invention, the temperature-controlled stirring in step A3 is magnetic stirring at 90-95°C for 20-30 minutes; the temperature of the temperature-controlled drying is 65-70°C for 3-4 hours.

[0024] As a preferred technical solution of the present invention, the curing agent includes methylhexahydrophthalic anhydride, and the accelerator includes 2-ethyl-4-methylimidazole.

[0025] The second aspect of the present application provides a method for preparing the above-mentioned nano-inorganic filler reinforced composite cable insulation material, comprising the following steps:

[0026] S1. After uniformly mixing the composite filler, adding the curing agent and controlling the stirring speed, the mixture is placed in an internal mixer and temperature-controlled internal mixing is performed. After thin-passing and rolling, the mixture is cooled to obtain a mixture A;

[0027] S2. Mixture A, epoxy resin, propylene chloroacetate, 3,4-epoxycyclohexyl-3,4-epoxycyclohexanecarboxylic acid and accelerator are mixed in an internal mixer at controlled temperature, and the mixture is thinned and rolled to obtain a finished cable insulation material.

[0028] As a preferred technical solution of the present invention, the speed of the speed-controlled stirring in step S1 is 600-700 r / min, and the time is 5-6 min; the temperature of the temperature-controlled banburying is 110-120° C., and the time is 4-5 min; and the cooling is cooling at room temperature for 7-8 h.

[0029] As a preferred technical solution of the present invention, the temperature of the temperature-controlled banburying in step S2 is 95-100° C. and the time is 2-3 minutes.

[0030] Beneficial effects of the present invention:

[0031] (1) In order to prepare a cable insulation material with excellent performance, the present application uses epoxy resin as the base material, and uses montmorillonite and hexagonal boron nitride, which have high insulation and high thermal conductivity properties, as the main fillers, and uses silicon powder as the auxiliary filler to fill the gaps between the montmorillonite and hexagonal boron nitride layers, thereby introducing corresponding deep and shallow traps inside the material, thereby preliminarily improving the insulation performance of the finished product;

[0032] Furthermore, in order to enhance the insulating effect of the filler on the system, the present application modifies montmorillonite and hexagonal boron nitride. Specifically, maltose is first added for ball milling to introduce hydroxyl groups as active sites. The ball-milled hexagonal boron nitride will be peeled into a lamellar structure. At the same time, dislocation defects may occur in the montmorillonite lamellar structure under the strong action of ball milling, that is, the bonding force between the two fillers will be reduced after ball milling. On this basis, polypropylene glycol is inserted into the gaps between the filler lamellar layers to prevent agglomeration to a certain extent. At the same time, the end-carboxyl hyperbranched polyester reacts with the introduced hydroxyl groups to graft long macromolecular chains, further expanding the filler agglomerates, improving the dispersion of the filler particles in the matrix, effectively hindering the charge accumulation rate in the obtained material, and improving the insulating properties of the finished product.

[0033] (2) The present application adds propylene chloroacetate to introduce polar groups, thereby enhancing the interaction between the composite filler and the substrate, optimizing the interface characteristics, and reducing the injection of charges. At the same time, the addition of 3,4-epoxycyclohexyl 3,4-epoxycyclohexanecarboxylic acid further strengthens the trap depth of the system and helps to increase the probability of carrier capture to a certain extent, effectively suppressing the accumulation of space charge and optimizing the insulation properties of the finished product. DETAILED DESCRIPTION

[0034] 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 embodiments described 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 making any creative efforts shall fall within the scope of protection of the present invention.

[0035] The montmorillonite used in the examples, comparative examples and test examples of the present application is purchased from Kexin Mining Products Co., Ltd. in Lingshou County; hexagonal boron nitride, item number: 00709, purchased from Nuotu Welding Material Co., Ltd. in Qinghe County; silicon powder purchased from Baixin New Material Technology Co., Ltd. in Lingshou County; carboxyl-terminated hyperbranched polyester, model number: HyPerC40, purchased from Wuhan Hyperbranched Resin Technology Co., Ltd.; E-44 type epoxy resin, brand: 6101 (E44), purchased from Jiangyin Wanqian Chemical Co., Ltd.; chloroacetic acid propylene ester, item number: R009507, purchased from Shanghai Yenn Chemical Technology Co., Ltd.; 3, 4-epoxy cyclohexyl 3, 4-epoxy cyclohexane carboxylic acid, item number: R016685, purchased from Shanghai Yenn Chemical Technology Co., Ltd.; the above will not be described in detail hereinafter.

[0036] Example 1

[0037] The modified montmorillonite is prepared by the following method:

[0038] A1, the montmorillonite is vacuum dried at 55℃ for 22h, the dried montmorillonite and maltose are mixed uniformly at a mass ratio of 1:3.5, then ball milled at a speed of 500r / min for 6h to obtain material A, material A and deionized water are mixed and stirred at 75℃ for 20min at a mass ratio of 1:2, then filtered, the filtered material is washed with deionized water for 3 times, then added with anhydrous ethanol to prepare a dispersion liquid with a mass concentration of 20mg / mL and ultrasonic treated for 1.5h, then vacuum dried at 75℃ after the anhydrous ethanol is volatilized to obtain material B;

[0039] A2, material B, polypropylene glycol, benzyl benzoate, ethanol solution and NaOH solution are mixed at a mass ratio of 7:5:0.07:40:0.015, then stirred at a speed of 380r / min until the ethanol solution is completely volatilized to obtain material C;

[0040] A3, acetone, carboxyl-terminated hyperbranched polyester, potassium hydroxide and 4-methylbenzenesulfonic acid are sequentially added to material C, then magnetically stirred at 90℃ for 20min, and dried at 70℃ for 3h to obtain the modified raw material;

[0041] The amount ratio of material C, acetone, carboxyl-terminated hyperbranched polyester, potassium hydroxide and 4-methylbenzenesulfonic acid is 10g:9g:0.05g:15mg:0.4g.

[0042] The modified hexagonal boron nitride is prepared by the following method:

[0043] A1, hexagonal boron nitride was dried under vacuum at 60 ° C for 22 h, the dried hexagonal boron nitride and maltose were mixed in a mass ratio of 1:3, and then ball milled at a speed of 500 r / min for 5 h to obtain material A, material A and deionized water were mixed in a mass ratio of 1:2.5 at 75 ° C and stirred for 20 min, and then filtered, the filter material was washed with deionized water 5 times, and anhydrous ethanol was added to prepare a dispersion with a mass concentration of 20 mg / mL and ultrasonicated for 1.5 h. After the anhydrous ethanol evaporated, the temperature was controlled at 65 ° C and vacuum dried to obtain material B;

[0044] A2, material B, polypropylene glycol, benzyl benzoate, ethanol solution and NaOH solution in a mass ratio of 5:5.5:0.07:40:0.02, and stirred at a controlled speed of 380 r / min until the ethanol solution was completely evaporated to obtain material C;

[0045] A3. Acetone, carboxyl-terminated hyperbranched polyester, potassium hydroxide, and 4-methylbenzenesulfonic acid were sequentially added to material C, and the mixture was stirred magnetically at 92.5°C for 25 min, and then dried at 70°C for 3 h to obtain a modified raw material.

[0046] The usage ratio of the material C, acetone, carboxyl-terminated hyperbranched polyester, potassium hydroxide and 4-methylbenzenesulfonic acid is 10 g:8 g:0.06 g:15.5 mg:0.35 g.

[0047] Example 2

[0048] Prepare modified montmorillonite, the preparation method of the modified montmorillonite is:

[0049] A1, the montmorillonite was vacuum dried at 60 ° C for 20 h, the dried montmorillonite and maltose were mixed in a mass ratio of 1:4, and then ball milled at 550 r / min for 5 h to obtain material A, and material A and deionized water were mixed at a mass ratio of 1:2.5 at 80 ° C for 15 min, and then filtered. The filter material was washed with deionized water 4 times, and then anhydrous ethanol was added to form a dispersion with a mass concentration of 20 mg / mL and ultrasonicated for 2 h. After the anhydrous ethanol evaporated, the temperature was controlled at 65 ° C for vacuum drying to obtain material B;

[0050] A2, material B, polypropylene glycol, benzyl benzoate, ethanol solution and NaOH solution in a mass ratio of 9:5.5:0.05:435:0.03, and stirred at a controlled speed of 350 r / min until the ethanol solution was completely evaporated to obtain material C;

[0051] A3. Acetone, carboxyl-terminated hyperbranched polyester, potassium hydroxide, and 4-methylbenzenesulfonic acid were sequentially added to material C, and the mixture was stirred at 92.5°C for 25 min. The mixture was then dried at 65°C for 4 h to obtain a modified raw material.

[0052] The usage ratio of the material C, acetone, carboxyl-terminated hyperbranched polyester, potassium hydroxide and 4-methylbenzenesulfonic acid is 10 g:8 g:0.06 g:15.5 mg:0.3 g.

[0053] Prepare modified hexagonal boron nitride, the preparation method of the modified hexagonal boron nitride is:

[0054] A1, hexagonal boron nitride was dried under vacuum at 55°C for 20 h, the dried hexagonal boron nitride and maltose were mixed in a mass ratio of 1:4, and then ball-milled at 550 r / min for 6 h to obtain material A, material A and deionized water were mixed in a mass ratio of 1:2 at 77°C, stirred for 17.5 min, and filtered, the filter material was washed three times with deionized water, and anhydrous ethanol was added to prepare a dispersion with a mass concentration of 20 mg / mL, and ultrasonicated for 2 h. After the anhydrous ethanol evaporated, the temperature was controlled at 75°C and vacuum-dried to obtain material B;

[0055] A2. Mix material B, polypropylene glycol, benzyl benzoate, ethanol solution, and NaOH solution in a mass ratio of 7:5:0.1:35:0.03, and stir at a controlled speed of 350 r / min until the ethanol solution is completely evaporated to obtain material C;

[0056] A3. Acetone, carboxyl-terminated hyperbranched polyester, potassium hydroxide, and 4-methylbenzenesulfonic acid were sequentially added to material C, and the mixture was stirred at 90°C for 20 min. The mixture was then dried at 65°C for 4 h to obtain a modified raw material.

[0057] The usage ratio of the material C, acetone, carboxyl-terminated hyperbranched polyester, potassium hydroxide and 4-methylbenzenesulfonic acid is 10 g:9 g:0.06 g:15 mg:0.3 g.

[0058] Example 3

[0059] Prepare modified montmorillonite, the preparation method of the modified montmorillonite is:

[0060] A1, the montmorillonite was vacuum dried at 57 ° C for 24 h, the dried montmorillonite and maltose were mixed in a mass ratio of 1:3, and then ball milled at 525 r / min for 5.5 h to obtain material A, and material A and deionized water were mixed in a mass ratio of 1:1.5 at 77 ° C for 17.5 min, and then filtered. The filter material was washed with deionized water 5 times, and then anhydrous ethanol was added to prepare a dispersion with a mass concentration of 20 mg / mL and ultrasonicated for 2 h. After the anhydrous ethanol evaporated, the temperature was controlled at 70 ° C for vacuum drying to obtain material B;

[0061] A2, material B, polypropylene glycol, benzyl benzoate, ethanol solution and NaOH solution in a mass ratio of 5:6:0.1:38:0.02, and stirred at a controlled speed of 365 r / min until the ethanol solution is completely evaporated to obtain material C;

[0062] A3. Acetone, carboxyl-terminated hyperbranched polyester, potassium hydroxide, and 4-methylbenzenesulfonic acid were sequentially added to material C, and the mixture was stirred at 95°C for 30 min. The mixture was then dried at 68°C for 3.5 h to obtain a modified raw material.

[0063] The usage ratio of the material C, acetone, carboxyl-terminated hyperbranched polyester, potassium hydroxide and 4-methylbenzenesulfonic acid is 10 g:10 g:0.06 g:16 mg:0.35 g.

[0064] Prepare modified hexagonal boron nitride, the preparation method of the modified hexagonal boron nitride is:

[0065] A1, hexagonal boron nitride was dried under vacuum at 57 ° C for 24 h, the dried hexagonal boron nitride and maltose were mixed in a mass ratio of 1:3.5, and then ball milled at 525 r / min for 5.5 h to obtain material A, material A and deionized water were mixed in a mass ratio of 1:1.5 at 80 ° C for 15 min, and then filtered, the filter material was washed with deionized water 4 times, and anhydrous ethanol was added to prepare a dispersion with a mass concentration of 20 mg / mL and ultrasonicated for 2 h. After the anhydrous ethanol evaporated, the temperature was controlled at 70 ° C for vacuum drying to obtain material B;

[0066] A2, material B, polypropylene glycol, benzyl benzoate, ethanol solution and NaOH solution in a mass ratio of 9:6:0.05:38:0.015, and stirred at a controlled speed of 365 r / min until the ethanol solution was completely evaporated to obtain material C;

[0067] A3. Acetone, carboxyl-terminated hyperbranched polyester, potassium hydroxide, and 4-methylbenzenesulfonic acid were sequentially added to material C, and the mixture was stirred at 95°C for 30 min. The mixture was then dried at 68°C for 3.5 h to obtain a modified raw material.

[0068] The usage ratio of the material C, acetone, carboxyl-terminated hyperbranched polyester, potassium hydroxide and 4-methylbenzenesulfonic acid is 10 g:10 g:0.05 g:16 mg:0.4 g.

[0069] Comparative Example 1

[0070] Compared with Example 2, the difference of Comparative Example 1 is that no maltose is added during the preparation of modified montmorillonite and modified hexagonal boron nitride, and the other operating steps and parameters remain unchanged.

[0071] Comparative Example 2

[0072] Compared with Example 2, the difference of Comparative Example 2 is that no polypropylene glycol is added during the preparation of modified montmorillonite and modified hexagonal boron nitride, and the other operating steps and parameters remain unchanged.

[0073] Comparative Example 3

[0074] Compared with Example 2, the difference of Comparative Example 3 is that no carboxyl-terminated hyperbranched polyester is added during the preparation of modified montmorillonite and modified hexagonal boron nitride, and the other operating steps and parameters remain unchanged.

[0075] Example 4

[0076] A nano-inorganic filler reinforced composite cable insulation material, comprising the following raw materials in parts by weight:

[0077] 90 parts by weight of E-44 epoxy resin, 7.5 parts by weight of modified montmorillonite prepared in Example 1, 8 parts by weight of modified hexagonal boron nitride prepared in Example 1, 5 parts by weight of silicon powder, 0.8 parts by weight of propylene chloroacetate, 3.3 parts by weight of 3,4-epoxycyclohexyl-3,4-epoxycyclohexanecarboxylic acid, 80 parts by weight of methylhexahydrophthalic anhydride, and 0.11 parts by weight of 2-ethyl-4-methylimidazole;

[0078] The preparation method of the nano inorganic filler reinforced composite cable insulation material comprises the following steps:

[0079] S1. After uniformly mixing the composite filler, add methyl hexahydrophthalic anhydride and stir at a controlled speed of 600 r / min for 6 min. Then, place in an internal mixer and control the temperature at 110°C for 5 min. After thinning and rolling, cool at room temperature for 7-8 h to obtain mixture A.

[0080] S2. Mixture A, epoxy resin, propylene chloroacetate, 3,4-epoxycyclohexyl-3,4-epoxycyclohexanecarboxylic acid and 2-ethyl-4-methylimidazole are mixed in an internal mixer at a temperature of 95°C for 3 minutes, and then thinned and rolled to obtain the finished cable insulation material.

[0081] Example 5

[0082] A nano-inorganic filler reinforced composite cable insulation material, comprising the following raw materials in parts by weight:

[0083] 95 parts by weight of E-44 epoxy resin, 5 parts by weight of modified montmorillonite prepared in Example 3, 9 parts by weight of modified hexagonal boron nitride prepared in Example 3, 2 parts by weight of silicon powder, 1 part by weight of propylene chloroacetate, 3.5 parts by weight of 3,4-epoxycyclohexyl-3,4-epoxycyclohexanecarboxylic acid, 82.5 parts by weight of methylhexahydrophthalic anhydride, and 0.1 part by weight of 2-ethyl-4-methylimidazole;

[0084] The preparation method of the nano inorganic filler reinforced composite cable insulation material comprises the following steps:

[0085] S1. After uniformly mixing the composite filler, add methyl hexahydrophthalic anhydride and stir at a controlled speed of 650 r / min for 5 minutes. Then, place in an internal mixer and control the temperature at 115°C for 4 minutes. After thin-passing and rolling, cool at room temperature for 7-8 hours to obtain mixture A.

[0086] S2. Mixture A, epoxy resin, propylene chloroacetate, 3,4-epoxycyclohexyl-3,4-epoxycyclohexanecarboxylic acid and 2-ethyl-4-methylimidazole are mixed in an internal mixer at a temperature of 97.5°C for 2 minutes, and then thinned and rolled to obtain the finished cable insulation material.

[0087] Example 6

[0088] A nano-inorganic filler reinforced composite cable insulation material, comprising the following raw materials in parts by weight:

[0089] 100 parts by weight of E-44 epoxy resin, 10 parts by weight of modified montmorillonite prepared in Example 2, 10 parts by weight of modified hexagonal boron nitride prepared in Example 2, 3.5 parts by weight of silicon powder, 0.9 parts by weight of propylene chloroacetate, 3 parts by weight of 3,4-epoxycyclohexyl-3,4-epoxycyclohexanecarboxylic acid, 85 parts by weight of methylhexahydrophthalic anhydride, and 0.12 parts by weight of 2-ethyl-4-methylimidazole;

[0090] The preparation method of the nano inorganic filler reinforced composite cable insulation material comprises the following steps:

[0091] S1. After uniformly mixing the composite filler, add methyl hexahydrophthalic anhydride and stir at a controlled speed of 700 r / min for 5.5 min. Then, place in an internal mixer and control the temperature at 120°C for 4.5 min. After thinning and rolling, cool at room temperature for 7-8 h to obtain mixture A.

[0092] S2. Mixture A, epoxy resin, propylene chloroacetate, 3,4-epoxycyclohexyl-3,4-epoxycyclohexanecarboxylic acid and 2-ethyl-4-methylimidazole are mixed in an internal mixer at a temperature of 100°C for 2.5 minutes, and then thinned and rolled to obtain a finished cable insulation material.

[0093] Comparative Examples 4-6

[0094] Compared with Example 6, the difference between Comparative Examples 4-6 is that the modified montmorillonite prepared in Example 2 and the modified hexagonal boron nitride prepared in Example 2 are replaced by the modified montmorillonite and modified hexagonal boron nitride prepared in Comparative Examples 1-3, respectively, and the other operating steps and parameters remain unchanged.

[0095] Comparative Example 7

[0096] Compared with Example 6, the difference of Comparative Example 7 is that the modified montmorillonite prepared in Example 2 is not added, and the missing weight is made up with modified hexagonal boron nitride and silicon powder prepared in Example 2 in a mass ratio of 10:3.5, and the other operating steps and parameters remain unchanged.

[0097] Comparative Example 8

[0098] Compared with Example 6, the difference of Comparative Example 8 is that the modified hexagonal boron nitride prepared in Example 2 is not added, the missing weight is made up with modified montmorillonite and silicon powder prepared in Example 2 in a mass ratio of 10:3.5, and the other operating steps and parameters remain unchanged.

[0099] Comparative Example 9

[0100] Compared with Example 6, the difference of Comparative Example 9 is that no silicon powder is added, the missing weight is made up with the modified montmorillonite prepared in Example 2 and the modified hexagonal boron nitride prepared in Example 2 in a mass ratio of 1:1, and the other operating steps and parameters remain unchanged.

[0101] Comparative Example 10

[0102] Compared with Example 6, the difference of Comparative Example 10 is that no propylene chloroacetate is added, and the other operating steps and parameters remain unchanged.

[0103] Comparative Example 11

[0104] Compared with Example 6, the difference of Comparative Example 11 is that 3,4-epoxycyclohexyl-3,4-epoxycyclohexanecarboxylic acid is not added, and the other operating steps and parameters remain unchanged.

[0105] Test Case

[0106] According to GB / T 15662-1995, the volume resistivity of the finished cable insulation materials prepared in Examples 4-6 and Comparative Examples 4-11 was tested, and the test results are shown in Table 1.

[0107] Table 1

[0108] Volume resistivity (Ω·cm) Example 4 5.9 x 10 16 ]] Example 5 5.8 x 10 16 ]] Example 6 <![CDATA[5.9×10 16 ]]> Comparative Example 4 <![CDATA[4.4×10 16 ]]> Comparative Example 5 <![CDATA[4.3×10 16 ]]> Comparative Example 6 <![CDATA[4.6×10 16 ]]> Comparative Example 7 <![CDATA[4.7×10 16 ]]> Comparative Example 8 <![CDATA[4.6×10 16 ]]> Comparative Example 9 <![CDATA[5.0×10 16 ]]> Comparative Example 10 <![CDATA[5.2×10 16 ]]> Comparative Example 11 <![CDATA[5.1×10 16 ]]>

[0109] It can be seen from Table 1 that the finished cable insulation material prepared in the present invention has excellent insulation performance.

[0110] Throughout the specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0111] The above content is merely an example and explanation of the concept of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A nano inorganic filler reinforced composite cable insulation material, characterized in that: The cable insulation material includes the following raw materials: Epoxy resin, composite filler, propylene chloroacetate, 3,4-epoxycyclohexyl-3,4-epoxycyclohexanecarboxylic acid, curing agent, accelerator; The composite filler comprises modified montmorillonite, modified hexagonal boron nitride and silicon powder.

2. The nano-inorganic filler reinforced composite cable insulation material according to claim 1, characterized in that: The cable insulation material comprises 90-100 parts by weight of epoxy resin, 15-25 parts by weight of composite filler, 0.8-1 parts by weight of propylene chloroacetate, 3-3.5 parts by weight of 3,4-epoxycyclohexyl-3,4-epoxycyclohexanecarboxylic acid, 80-85 parts by weight of curing agent and 0.1-0.12 parts by weight of accelerator.

3. The nano-inorganic filler reinforced composite cable insulation material according to claim 1, characterized in that: The composite filler comprises 5-10 parts by weight of modified montmorillonite, 8-10 parts by weight of modified hexagonal boron nitride, and 2-5 parts by weight of silicon micropowder.

4. The nano-inorganic filler reinforced composite cable insulation material according to claim 1, characterized in that: The preparation methods of the modified montmorillonite and modified hexagonal boron nitride are both: A1. Dry the raw material under vacuum at controlled temperature, mix the dried raw material and maltose evenly, and then ball-mill at controlled speed to obtain material A. Mix material A with deionized water under controlled temperature and stir, then filter, wash the filter material, add anhydrous ethanol to form a dispersion, and sonicate. After the anhydrous ethanol evaporates, dry the dispersion under controlled temperature and vacuum, then obtain material B. A2, mixing material B, polypropylene glycol, benzyl benzoate, ethanol solution and NaOH solution, and stirring at a controlled speed until the ethanol solution is completely evaporated to obtain material C; A3. Add acetone, carboxyl-terminated hyperbranched polyester, potassium hydroxide and 4-methylbenzenesulfonic acid to material C in sequence, stir under controlled temperature, and dry under controlled temperature to obtain a modified raw material.

5. The nano-inorganic filler reinforced composite cable insulation material according to claim 4, characterized in that: The mass ratio of the dried raw material to maltose in step A1 is 1:3-4; the mass ratio of material A to deionized water is 1:1.5-2.

5.

6. The nano-inorganic filler reinforced composite cable insulation material according to claim 4, characterized in that: The mass ratio of material B, polypropylene glycol, benzyl benzoate, ethanol solution and NaOH solution in step A2 is 5-9:5-6:0.05-0.1:35-40:0.015-0.

03.

7. The nano-inorganic filler reinforced composite cable insulation material according to claim 4, characterized in that: The usage ratio of material C, acetone, carboxyl-terminated hyperbranched polyester, potassium hydroxide and 4-methylbenzenesulfonic acid in step A3 is 10 g: 8-10 g: 0.05-0.06 g: 15-16 mg: 0.3-0.4 g.

8. The nano-inorganic filler reinforced composite cable insulation material according to claim 1, characterized in that: The curing agent includes methylhexahydrophthalic anhydride, and the accelerator includes 2-ethyl-4-methylimidazole.

9. A method for preparing the nano-inorganic filler reinforced composite cable insulation material according to any one of claims 1 to 8, characterized in that: The steps include: S1. After uniformly mixing the composite filler, adding the curing agent and stirring at a controlled speed, the mixture is placed in an internal mixer and kneaded at a controlled temperature. After thin-passing and rolling, the mixture is cooled to obtain a mixture A. S2. Mixture A, epoxy resin, propylene chloroacetate, 3,4-epoxycyclohexyl-3,4-epoxycyclohexanecarboxylic acid and accelerator are mixed in an internal mixer at controlled temperature, and the mixture is thinned and rolled to obtain a finished cable insulation material.

10. The nano-inorganic filler reinforced composite cable insulation material according to claim 1, characterized in that: The speed of the speed-controlled stirring in step S1 is 600-700 r / min, and the time is 5-6 min; the temperature of the temperature-controlled banburying is 110-120°C, and the time is 4-5 min; the cooling is cooling at room temperature for 7-8 h; the temperature of the temperature-controlled banburying in step S2 is 95-100°C, and the time is 2-3 min.