An anti-aging material for power metering box cabinets

Abstract

This invention discloses an anti-aging power metering box cabinet material, relating to the field of organic materials technology. The anti-aging power metering box cabinet material comprises the following raw materials by weight percentage: 25%-35% unsaturated polyester resin, 11%-15% low-shrinkage agent, 0.5%-2% initiator, 2.5-8% additives, 35%-50% organic composite filler, and 15%-25% modified chopped glass fiber. This application adds the prepared modified chopped glass fiber to the unsaturated polyester resin, along with the remaining additives required for preparing the electrical cabinet material, to obtain the cabinet material for use in power metering boxes. The power metering box cabinet material prepared in this application has advantages such as excellent mechanical properties, stable environmental aging resistance, low dielectric loss, and low dielectric constant.

Description

Technical Field

[0001] This invention relates to the field of organic materials technology, specifically to an anti-aging material for an energy metering box cabinet. Background Technology

[0002] With the rapid development of the modern power industry and the continuous expansion of the power grid, electricity metering boxes have become a crucial component of the power system. An electricity metering box is a specialized enclosure used to install electricity metering equipment and related accessories such as energy collection and electrical protection devices. As an indispensable piece of equipment in the power system, electricity metering boxes are widely used in outdoor settings such as residential communities and industrial parks, undertaking the responsibility of metering, distributing, and protecting users' electricity consumption. Their application in the power system is becoming increasingly widespread. However, the outdoor environment is more complex than the indoor environment. Problems such as high temperature, humidity, and rain and snow corrosion make electricity metering boxes prone to equipment failure, thus affecting the accuracy of power data and the stability of transmission. Therefore, the safety and functionality of electricity metering boxes are receiving increasing attention.

[0003] While protecting the internal electrical and communication equipment, the casing of an electricity metering box should also consider the impact of its material on the communication performance of wireless communication devices. The dielectric properties of the casing material are a key factor affecting the communication performance of wireless devices. The absorption and reflection of electromagnetic waves by the casing reduces signal transmission efficiency; therefore, the casing material of the electricity metering box needs to be low in dielectric loss and low in dielectric constant. Furthermore, the casing protects the electricity metering device from external environmental influences (such as high temperature, low temperature, humidity, and UV aging), thereby ensuring the normal operation and accurate measurement of the electricity metering device. The casing of the electricity metering box should also meet requirements for mechanical properties and weather resistance.

[0004] The outer shell materials of electricity metering boxes are divided into two types: metallic and non-metallic. Metallic materials are typically stainless steel and hot-dip galvanized steel. Stainless steel and hot-dip galvanized steel have high density, are heavy, and expensive, and both have high dielectric properties, which can shield communication signals. Non-metallic materials are typically polycarbonate resin / acrylonitrile-butadiene-styrene resin and fiber-reinforced unsaturated polyester molding compound. However, polycarbonate resin / acrylonitrile-butadiene-styrene resin has poor solvent resistance and is prone to cracking, especially in cold, coastal, and high-salt areas where it is easily corroded. Fiber-reinforced unsaturated polyester molding compound has advantages such as lower density, no deformation, stable geometry, good electrical insulation, strong wave transmission, and strong weather resistance; however, directly adding glass fiber results in high dielectric constant and significant polarization loss at high frequencies. Furthermore, glass fiber has poor compatibility with resin and weak interfacial bonding, leading to decreased dielectric properties and interfacial aging, which limits the application of fiber-reinforced unsaturated polyester molding compound in electricity metering box cabinet materials. Summary of the Invention

[0005] The purpose of this invention is to provide an anti-aging material for electricity metering box cabinets, thereby solving the following technical problems:

[0006] The direct addition of chopped glass fibers to existing fiber-reinforced unsaturated polyester molding compounds leads to a decrease in the dielectric properties of the composite material and interface aging problems, which limits the application of fiber-reinforced unsaturated polyester molding compounds in the materials of power metering box cabinets.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] An anti-aging energy metering box cabinet material comprises the following raw materials by weight percentage:

[0009] 25%-35% unsaturated polyester resin, 11%-15% low shrinkage agent, 0.5%-2% initiator, 2.5-8% additives, 35%-50% organic composite filler, 15%-25% modified chopped glass fiber;

[0010] The method for preparing the modified chopped glass fiber includes the following steps:

[0011] S1: Dopamine-modified glass fiber, anhydrous ethanol, deionized water, and tetraethyl orthosilicate were added to reactor A and dispersed. The pH was adjusted to 5-6, and hexadecyltrimethylammonium bromide was added. The temperature was controlled at 30-40℃ and the reaction was stirred for 3-6 hours. The temperature was raised to 70-80℃ and the reaction was stirred for 1-2 hours. After centrifugation, washing, and calcination, mesoporous SiO2-coated glass fiber was obtained.

[0012] S2: Mesoporous SiO2-coated glass fiber, boron nitride nanosheets, anhydrous ethanol, and deionized water are added to reactor B and dispersed. The temperature is controlled at 50-60℃ and the reaction is stirred for 3-6 hours to obtain double-layer coated glass fiber.

[0013] S3: Add double-layered glass fiber, ethanol, deionized water, and heptadecafluorodecyltrimethoxysilane to reactor C for dispersion, adjust pH to 4-4.5, control temperature at 60-70℃, stir reaction for 2-4 hours, centrifuge, wash, and dry to obtain modified chopped glass fiber.

[0014] As a further aspect of the present invention, the preparation method of dopamine-modified glass fiber includes the following steps: placing short-cut glass fibers in a Tris buffer solution of 0.5% polydopamine (pH=8.5), stirring magnetically at room temperature for 12-24 hours, washing, filtering, and drying to obtain dopamine-modified glass fiber.

[0015] As a further aspect of the present invention: the chopped glass fibers are treated with oxygen plasma (50W, 5min) before dopamine modification.

[0016] As a further aspect of the present invention: the boron nitride nanosheets are hydroxylated boron nitride nanosheets.

[0017] As a further embodiment of the present invention: the addition ratio of dopamine-modified glass fiber, anhydrous ethanol, deionized water, tetraethyl orthosilicate, and hexadecyltrimethylammonium bromide in S1 is 10g: 80-160mL: 20-40mL: 0.5-1g: 0.05-0.15g.

[0018] As a further aspect of the present invention: the addition ratio of S2 mesoporous SiO2-encapsulated glass fiber, boron nitride nanosheets, anhydrous ethanol, and deionized water is 10g:0.5-1g:100mL-200mL:100mL-200mL.

[0019] As a further aspect of the present invention: the addition ratio of double-layered glass fiber, ethanol, deionized water and heptadecafluorodecyltrimethoxysilane in S3 is 10g: 60-80mL: 20-40mL: 0.1-0.2g.

[0020] As a further aspect of the present invention, the preparation method of the organic composite filler includes the following steps:

[0021] A1: Adjust the pH of aluminum hydroxide and KH560 solution to 4-5, control the temperature at 50-60℃, keep the reaction at this temperature for 2-4 hours, filter and dry to obtain modified aluminum hydroxide;

[0022] A2: Hollow glass microspheres and heptadecafluorodecyltrimethoxysilane solution were mixed, ultrasonically dispersed at room temperature for 0.5-1 h, filtered and dried to obtain modified hollow glass microspheres;

[0023] A3: Hydroxylated boron nitride sheets and KH550 solution are mixed, and the reaction is carried out at a controlled temperature of 100-110℃ for 4-8 hours to obtain modified boron nitride;

[0024] A4: Modified aluminum hydroxide, modified hollow glass microspheres, and modified boron nitride are blended to obtain an organic composite filler.

[0025] As a further aspect of the present invention: the KH560 solution in A1 is a 3-5wt% KH560 silane ethanol aqueous solution, and the volume ratio of ethanol to water in the KH560 solution is 9:1; the addition ratio of aluminum hydroxide to KH560 solution is 10g:30-50mL;

[0026] In A2, the heptadecanodecyltrimethoxysilane solution is a 5-10 wt% heptadecanodecyltrimethoxysilane acetone solution; the addition ratio of 10g hollow glass microspheres to 30-50mL heptadecanodecyltrimethoxysilane solution is 10g:30-50mL.

[0027] In A3, hydroxylated boron nitride tablets are obtained by reflux oxidation of boron nitride tablets with concentrated nitric acid for 2 hours; the KH550 toluene solution is 5-10 wt% KH550 toluene solution; the addition ratio of hydroxylated boron nitride tablets to KH550 solution is 10 g: 30-60 mL;

[0028] The mass ratio of modified aluminum hydroxide, modified hollow glass microspheres, and modified boron nitride in A4 is 60-70:15-20:5-15.

[0029] As a further aspect of the present invention: the unsaturated polyester resin is composed of one or more of orthophthalic resin, isophthalic resin, and vinyl ester resin;

[0030] The initiator is one or more of tert-butyl peroxide and tert-butyl peroxide-2-ethylhexanoate;

[0031] The low-shrinkage agent is composed of one or more of the following: polystyrene low-shrinkage agent, polyvinyl acetate low-shrinkage agent, polycaprolactone low-shrinkage agent, and saturated polyester resin low-shrinkage agent.

[0032] As a further aspect of the present invention: the additives include polymerization inhibitors, release agents, and thickeners;

[0033] The polymerization inhibitor accounts for 0.01%-0.02% of the total mass of the cabinet material; the polymerization inhibitor is composed of one or more of phenol, hydroquinone, tert-butylcatechol, 2-tert-butylhydroquinone, 2,5-di-tert-butylhydroquinone, 2,6-di-tert-butyl-p-cresol, and 2,6-di-tert-butyl-4-methylphenol.

[0034] The release agent accounts for 1%-3% of the total mass of the cabinet material; the release agent is composed of one or more of calcium stearate, zinc stearate, and magnesium stearate;

[0035] The thickener accounts for 1%-5% of the total mass of the cabinet material; the thickener is composed of one or more of magnesium oxide, magnesium hydroxide, calcium oxide and calcium hydroxide.

[0036] As a further aspect of the present invention: the cabinet material also includes a colorant and a wetting agent; the colorant accounts for 2-4% of the total mass of the cabinet material;

[0037] The wetting agent accounts for 1-2% of the total mass of the cabinet material; the wetting agent is one or a mixture of two of BYK-W9010 and BYK-W996.

[0038] An anti-aging power metering box cabinet material is disclosed. The preparation method of the cabinet material includes the following steps: mixing and molding the raw materials according to the raw material mass distribution ratio to obtain the cabinet material.

[0039] As a further aspect of the present invention, molding includes compression molding, injection molding, transfer molding, etc.

[0040] Compression molding process includes: molding pressure 3-10MPa, molding temperature 140-150℃, and molding time 25-45s / mm;

[0041] Injection molding process includes: molding pressure 50-100MPa, secondary pressure 20-50MPa, molding temperature 150-170℃, molding time 90s, injection time 3-15s;

[0042] The transfer molding process includes: molding pressure 15-30MPa, molding temperature 145-155℃, and molding time 20-40s / mm.

[0043] The beneficial effects of this invention are:

[0044] (1) Improve the interfacial properties between chopped glass fibers and resin matrix

[0045] This application first treats dopamine-modified glass fibers with tetraethyl orthosilicate to obtain mesoporous SiO2-coated glass fibers; then boron nitride nanosheets are adsorbed onto the surface of the mesoporous layer through hydrogen bonding to obtain double-layer coated glass fibers; finally, a hydrophobic protective layer is constructed using heptadecafluorodecyltrimethoxysilane to obtain modified chopped glass fibers.

[0046] This application uses dopamine to organically coat the glass fiber surface, serving as a transition layer for subsequent mesoporous SiO2 encapsulation. Exposed amino and hydroxyl groups on the surface act as growth sites for the mesoporous SiO2, ensuring a uniform and dense mesoporous SiO2 layer encapsulates the fiber surface. The introduction of this mesoporous SiO2 layer lowers the overall dielectric constant of the interface region, and the mesoporous channels can anchor boron nitride nanosheets. This not only lays the foundation for the subsequent low-dielectric superposition of boron nitride nanosheets, avoiding uneven dielectric loss caused by agglomeration, but also, as a dense inorganic barrier, the mesoporous silica layer can block the penetration of moisture and oxygen into the glass fiber-resin interface, reducing interfacial hydrolytic aging. This application further introduces boron nitride nanosheets, adsorbing and constructing a double-layer encapsulation to enhance the low-dielectric performance, while simultaneously improving the material's weather resistance and insulation, matching the low dielectric loss requirements of power metering boxes. Finally, the introduction of heptadecafluorodecyltrimethoxysilane reduces moisture penetration into the interface at the outermost layer, while the chemical inertness of the fluorocarbon chain resists environmental aging factors such as ultraviolet radiation and oxidation, delaying the decay of interfacial bonding.

[0047] (2) Construct organic composite fillers to improve the physical and chemical properties of cabinet materials.

[0048] This application utilizes silane coupling agents to organically modify aluminum hydroxide, hollow glass microspheres, and boron nitride. Aluminum hydroxide is organically modified with KH560 to obtain aluminum hydroxide with epoxy groups grafted onto its surface. The epoxy groups form a stepwise flame retardant with aluminum hydroxide, extending the flame retardant time. The epoxy resin and unsaturated polyester resin undergo ring-opening to form a chemical cross-linking network, improving interfacial bonding strength. Hollow glass microspheres are organically modified with heptadecafluorodecyltrimethoxysilane to obtain hollow glass microspheres with fluoroalkyl chains grafted onto their surface. This reduces the surface polarity of the material, lowers the dielectric constant of the hollow glass microspheres, suppresses high-frequency polarization loss, and the fluoroalkyl chains form a dense molecular layer, improving the hydrophobic properties of the material and preventing moisture penetration that could degrade dielectric properties. The long-chain fluoroalkyl chain structure has a low coefficient of friction, alleviating shear stress during the molding process and protecting the integrity of the microspheres during processing. Boron nitride sheets are organically modified with KH550 to obtain boron nitride sheets with amino groups grafted onto their surface, effectively improving the thermal conductivity of the material.

[0049] By combining modified aluminum hydroxide, modified hollow glass microspheres, and modified boron nitride sheets, the flame retardancy of aluminum hydroxide is maintained, while the dielectric constant is reduced by using hollow microspheres and the thermal conductivity is improved by using boron nitride, thereby achieving the effects of reducing the dielectric constant, increasing the limiting oxygen index of the material, and improving the thermal conductivity. Detailed Implementation

[0050] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] Example 1: The preparation method of organic composite filler includes the following steps:

[0052] A1: Mix 10g of aluminum hydroxide (median particle size D50=8μm) with 30mL of 3wt% KH560 silane ethanol aqueous solution (V water:V ethanol=1:9), adjust the pH to 4.5, control the temperature at 50-60℃, keep the reaction at this temperature for 2-4h, filter and dry to obtain modified aluminum hydroxide;

[0053] A2: 10g of hollow glass microspheres (particle size 20-50μm) and 50mL of 5wt% heptadecafluorodecyltrimethoxysilane acetone solution were mixed, ultrasonically dispersed at room temperature for 0.1h, filtered and dried to obtain modified hollow glass microspheres;

[0054] A3: Boron nitride sheets (50 nm thick) were refluxed with concentrated nitric acid for 2 h to obtain hydroxylated boron nitride sheets; 10 g of hydroxylated boron nitride sheets and 50 mL of 10 wt% KH550 toluene solution were mixed and reacted at 100 °C for 8 h to obtain modified boron nitride.

[0055] A4: Modified aluminum hydroxide, modified hollow glass microspheres, and modified boron nitride in a mass ratio of 65:20:15 are blended to obtain an organic composite filler.

[0056] Example 2: The preparation method of modified chopped glass fibers includes the following steps:

[0057] S1: 20g of chopped glass fibers (treated with oxygen plasma at 50W for 5min) were placed in 100mL of 0.5% polydopamine Tris buffer (pH=8.5), and magnetically stirred at room temperature for 24h. The fibers were then washed, filtered, and dried to obtain dopamine-modified glass fibers.

[0058] 20g of dopamine-modified glass fiber, 160mL of anhydrous ethanol, 40mL of deionized water, and 1g of tetraethyl orthosilicate were dispersed in reactor A. The pH was adjusted to 5, and 0.1g of cetyltrimethylammonium bromide was added. The temperature was controlled at 30℃ and the reaction was stirred for 3-6 hours. The temperature was then raised to 70℃ and the reaction was stirred for 1-2 hours. The mixture was centrifuged, washed, and calcined (550℃ for 3 hours) to obtain mesoporous SiO2-coated glass fiber.

[0059] S2: 20g of mesoporous SiO2-coated glass fiber, 1g of hydroxylated boron nitride nanosheets, 200mL of anhydrous ethanol and 200mL of deionized water were added to a reaction vessel and dispersed. The temperature was controlled at 50℃ and the reaction was stirred for 3h to obtain double-layer coated glass fiber.

[0060] S3: 20g of double-layer coated glass fiber, 120mL of ethanol, 40mL of deionized water and 0.2g of heptadecafluorodecyltrimethoxysilane were added to the reaction vessel and dispersed. The pH was adjusted to 4, the temperature was controlled at 60℃ and the reaction was stirred for 2h. After centrifugation, washing and drying, modified short-cut glass fiber was obtained.

[0061] Example 3: The preparation method of modified chopped glass fibers includes the following steps:

[0062] S1: 20g of chopped glass fibers (treated with oxygen plasma at 50W for 5min) were placed in 100mL of 0.5% polydopamine Tris buffer (pH=8.5), and magnetically stirred at room temperature for 24h. The fibers were then washed, filtered, and dried to obtain dopamine-modified glass fibers.

[0063] 20g of dopamine-modified glass fiber, 200mL of anhydrous ethanol, 50mL of deionized water, and 1.5g of tetraethyl orthosilicate were dispersed in reactor A. The pH was adjusted to 5.5, and 0.2g of cetyltrimethylammonium bromide was added. The temperature was controlled at 35℃ and the reaction was stirred for 4.5h. The temperature was then raised to 75℃ and the reaction was stirred for 1.5h. The mixture was centrifuged, washed, and calcined (550℃ for 3h) to obtain mesoporous SiO2-coated glass fiber.

[0064] S2: 20g of mesoporous SiO2-coated glass fiber, 1.5g of hydroxylated boron nitride nanosheets, 300mL of anhydrous ethanol and 300mL of deionized water were added to a reaction vessel and dispersed. The temperature was controlled at 55℃ and the reaction was stirred for 4.5h to obtain double-layer coated glass fiber.

[0065] S3: 20g of double-layer coated glass fiber, 120mL of ethanol, 80mL of deionized water and 0.3g of heptadecafluorodecyltrimethoxysilane were added to the reaction vessel and dispersed. The pH was adjusted to 4, the temperature was controlled at 65℃ and the reaction was stirred for 3h. After centrifugation, washing and drying, modified short-cut glass fiber was obtained.

[0066] Example 4: The preparation method of modified chopped glass fibers includes the following steps:

[0067] S1: 20g of chopped glass fibers (treated with oxygen plasma at 50W for 5min) were placed in 100mL of 0.5% polydopamine Tris buffer (pH=8.5), and magnetically stirred at room temperature for 24h. The fibers were then washed, filtered, and dried to obtain dopamine-modified glass fibers.

[0068] 20g of dopamine-modified glass fiber, 320mL of anhydrous ethanol, 80mL of deionized water, and 2g of tetraethyl orthosilicate were dispersed in reactor A. The pH was adjusted to 6, and 0.3g of cetyltrimethylammonium bromide was added. The temperature was controlled at 40℃ and the reaction was stirred for 6h. The temperature was then raised to 80℃ and the reaction was stirred for 1-2h. The mixture was centrifuged, washed, and calcined (550℃, 3h) to obtain mesoporous SiO2-coated glass fiber.

[0069] S2: 20g of mesoporous SiO2-coated glass fiber, 2g of hydroxylated boron nitride nanosheets, 400mL of anhydrous ethanol and 400mL of deionized water were added to a reaction vessel and dispersed. The temperature was controlled at 60℃ and the reaction was stirred for 6h to obtain double-layer coated glass fiber.

[0070] S3: 20g of double-layer coated glass fiber, 160mL of ethanol, 80mL of deionized water and 0.4g of heptadecafluorodecyltrimethoxysilane were added to the reaction vessel and dispersed. The pH was adjusted to 4.5, the temperature was controlled at 70℃ and the reaction was stirred for 4h. After centrifugation, washing and drying, modified short-cut glass fiber was obtained.

[0071] Example 5: A method for preparing an anti-aging power metering box cabinet material includes the following steps:

[0072] According to the raw material mass distribution ratio, 30% phthalic unsaturated polyester resin, 12% polystyrene low shrinkage agent, 1% tert-butyl peroxide, 0.02% tert-butylcatechol, 2% magnesium stearate, 4% magnesium oxide, 35% organic composite filler prepared in Example 1, and 15.98% modified chopped glass fiber prepared in Example 2 were kneaded and mixed, and then injection molded (molding pressure 70MPa, secondary pressure 35MPa, molding temperature 160℃, molding time 90s, injection time 12s) to obtain the cabinet material.

[0073] Example 6 is the same as Example 5 except that the modified chopped glass fibers prepared in Example 2 are replaced in equal amounts with the modified chopped glass fibers prepared in Example 3. The other components and preparation methods are completely the same as in Example 5.

[0074] Example 7 is the same as Example 5 except that the modified chopped glass fibers prepared in Example 2 are replaced in equal amounts with the modified chopped glass fibers prepared in Example 4. The other components and preparation methods are completely the same as in Example 5.

[0075] Comparative Example 1: The preparation method of the organic composite filler includes the following steps:

[0076] 10g of aluminum hydroxide (median particle size D50=8μm) and 30mL of 3wt% KH560 silane-ethanol aqueous solution (V water:V ethanol=1:9) were mixed, the pH was adjusted to 4.5, the temperature was controlled at 50-60℃, and the reaction was kept at this temperature for 2-4h. The mixture was then filtered and dried to obtain the organic composite filler.

[0077] Comparative Example 2: The preparation method of modified chopped glass fibers includes the following steps:

[0078] S1: 20g of chopped glass fibers (treated with oxygen plasma at 50W for 5min) were placed in 100mL of 0.5% polydopamine Tris buffer (pH=8.5), and magnetically stirred at room temperature for 24h. The fibers were then washed, filtered, and dried to obtain dopamine-modified glass fibers.

[0079] 20g of dopamine-modified glass fiber, 200mL of anhydrous ethanol, 50mL of deionized water, and 1.5g of tetraethyl orthosilicate were added to reactor A and dispersed. The pH was adjusted to 5.5, the temperature was controlled at 35℃, and the reaction was stirred for 4.5h. The temperature was then raised to 75℃ and the reaction was stirred for 1.5h. The mixture was centrifuged, washed, and calcined (550℃, 3h) to obtain SiO2-coated glass fiber.

[0080] S2: 20g of SiO2-coated glass fiber, 1.5g of hydroxylated boron nitride nanosheets, 300mL of anhydrous ethanol and 300mL of deionized water were added to a reaction vessel and dispersed. The temperature was controlled at 55℃ and the reaction was stirred for 4.5h to obtain double-layer coated glass fiber.

[0081] S3: 20g of double-layer coated glass fiber, 120mL of ethanol, 80mL of deionized water and 0.3g of heptadecafluorodecyltrimethoxysilane were added to the reaction vessel and dispersed. The pH was adjusted to 4, the temperature was controlled at 65℃ and the reaction was stirred for 3h. After centrifugation, washing and drying, modified short-cut glass fiber was obtained.

[0082] Comparative Example 3: The preparation method of modified chopped glass fibers includes the following steps:

[0083] S1: 20g of glass fiber (treated with oxygen plasma at 50W for 5min), 200mL of anhydrous ethanol, 50mL of deionized water, and 1.5g of tetraethyl orthosilicate were dispersed in reactor A. The pH was adjusted to 5.5, and 0.2g of cetyltrimethylammonium bromide was added. The temperature was controlled at 35℃ and the reaction was stirred for 4.5h. The temperature was then raised to 75℃ and the reaction was stirred for 1.5h. The mixture was centrifuged, washed, and calcined (550℃ for 3h) to obtain mesoporous SiO2-coated glass fiber.

[0084] S2: 20g of mesoporous SiO2-coated glass fiber, 1.5g of hydroxylated boron nitride nanosheets, 300mL of anhydrous ethanol and 300mL of deionized water were added to a reaction vessel and dispersed. The temperature was controlled at 55℃ and the reaction was stirred for 4.5h to obtain double-layer coated glass fiber.

[0085] S3: 20g of double-layer coated glass fiber, 120mL of ethanol, 80mL of deionized water and 0.3g of heptadecafluorodecyltrimethoxysilane were added to the reaction vessel and dispersed. The pH was adjusted to 4, the temperature was controlled at 65℃ and the reaction was stirred for 3h. After centrifugation, washing and drying, modified short-cut glass fiber was obtained.

[0086] Comparative Example 4: The preparation method of modified chopped glass fibers includes the following steps:

[0087] S1: 20g of chopped glass fibers (treated with oxygen plasma at 50W for 5min) were placed in 100mL of 0.5% polydopamine Tris buffer (pH=8.5), and magnetically stirred at room temperature for 24h. The fibers were then washed, filtered, and dried to obtain dopamine-modified glass fibers.

[0088] 20g of dopamine-modified glass fiber, 1.5g of hydroxylated boron nitride nanosheets, 300mL of anhydrous ethanol and 300mL of deionized water were added to a reaction vessel and dispersed. The temperature was controlled at 55℃ and the reaction was stirred for 4.5h to obtain boron nitride nanosheets encapsulating glass fiber.

[0089] S2: 20g of boron nitride nanosheets coated with glass fiber, 200mL of anhydrous ethanol, 50mL of deionized water, and 1.5g of tetraethyl orthosilicate were added to reactor A for dispersion. The pH was adjusted to 5.5, and 0.2g of cetyltrimethylammonium bromide was added. The temperature was controlled at 35℃ and the reaction was stirred for 4.5h. The temperature was then raised to 75℃ and the reaction was stirred for 1.5h. After centrifugation, washing, and calcination (550℃, 3h), double-layer coated glass fiber was obtained.

[0090] S3: 20g of double-layer coated glass fiber, 120mL of ethanol, 80mL of deionized water and 0.3g of heptadecafluorodecyltrimethoxysilane were added to the reaction vessel and dispersed. The pH was adjusted to 4, the temperature was controlled at 65℃ and the reaction was stirred for 3h. After centrifugation, washing and drying, modified short-cut glass fiber was obtained.

[0091] Compared with Example 5, Comparative Example 5 only replaced the organic composite filler prepared in Example 1 with an equal amount of the organic composite filler prepared in Comparative Example 1. The remaining components and preparation methods were completely the same as those in Example 5.

[0092] Comparative Example 6 is the same as Example 5 except that the modified chopped glass fibers prepared in Example 2 are replaced in equal amounts with the modified chopped glass fibers prepared in Comparative Example 2. The other components and preparation methods are completely the same as those in Example 5.

[0093] Compared with Example 5, Comparative Example 7 only replaced the modified chopped glass fibers prepared in Example 2 with the modified chopped glass fibers prepared in Comparative Example 3 in equal amounts. The remaining components and preparation methods were completely the same as in Example 5.

[0094] Compared with Example 5, Comparative Example 8 only replaced the modified chopped glass fibers prepared in Example 2 with the modified chopped glass fibers prepared in Comparative Example 4 in equal amounts. The remaining components and preparation methods were completely the same as in Example 5.

[0095] Performance testing

[0096] (1) Dielectric properties: The dielectric properties were tested according to GB / T 1409-2006 "Recommended methods for measuring the permittivity and dielectric loss factor of electrical insulation materials at power frequency, audio frequency and high frequency". The test results are shown in Table 1.

[0097] (2) Mechanical properties: The test was conducted according to GB / T 1040.2-2006 "Determination of tensile properties of plastics - Part 2: Test conditions for molded and extruded plastics". The test results are shown in Table 1.

[0098] (3) Hygroscopicity: The test was conducted according to GB / T 1034-2008 "Determination of water absorption of plastics", and the test results are shown in Table 1;

[0099] Table 1: Performance Test Data Statistics of Examples 5-7 and Comparative Examples 5-8

[0100]

[0101] As shown in Table 1, the cabinet materials prepared in Examples 5-7 of this application have good mechanical properties, low dielectric properties, and low water absorption.

[0102] (4) Damp heat aging test: The test was conducted according to GB / T 2573-2008 "Test method for aging performance of glass fiber reinforced plastics". The test conditions were 85℃ / 85%RH and 1000h. The water absorption rate and tensile strength retention rate of the cabinet material were tested. The test results are shown in Table 2.

[0103] (5) Accelerated UV aging: Tested according to GB / T 16422.3-2022 "Laboratory Light Source Exposure Test Methods for Plastics - Part 3: Fluorescent UV Lamps", test conditions: 0.55W / m 2 340nm, 500h cycle; detect the retention rate of tensile strength and the increase in dielectric loss of cabinet material. The test results are shown in Table 2.

[0104] Table 2: Statistical Table of Aging Resistance Test Data for Examples 5-7 and Comparative Examples 5-8

[0105]

[0106] As shown in Table 2, the cabinet materials prepared in Examples 5-7 of this application have resistance to damp heat aging and ultraviolet aging.

[0107] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A material for an anti-aging electricity metering box cabinet, characterized in that, The raw materials include the following weight percentages: 25%-35% unsaturated polyester resin, 11%-15% low shrinkage agent, 0.5%-2% initiator, 2.5-8% additives, 35%-50% organic composite filler, 15%-25% modified chopped glass fiber; The method for preparing the modified chopped glass fiber includes the following steps: S1: Dopamine-modified glass fiber, anhydrous ethanol, deionized water, and tetraethyl orthosilicate were added to reactor A and dispersed. The pH was adjusted to 5-6, and hexadecyltrimethylammonium bromide was added. The temperature was controlled at 30-40℃ and the reaction was stirred for 3-6 hours. The temperature was raised to 70-80℃ and the reaction was stirred for 1-2 hours. After centrifugation, washing, and calcination, mesoporous SiO2-coated glass fiber was obtained. S2: Mesoporous SiO2-coated glass fiber, boron nitride nanosheets, anhydrous ethanol, and deionized water are added to reactor B and dispersed. The temperature is controlled at 50-60℃ and the reaction is stirred for 3-6 hours to obtain double-layer coated glass fiber. S3: Add double-layered glass fiber, ethanol, deionized water, and heptadecafluorodecyltrimethoxysilane to reactor C for dispersion, adjust pH to 4-4.5, control temperature at 60-70℃, stir reaction for 2-4 hours, centrifuge, wash, and dry to obtain modified short-cut glass fiber; The preparation method of the organic composite filler includes the following steps: A1: Adjust the pH of aluminum hydroxide and KH560 solution to 4-5, control the temperature at 50-60℃, keep the reaction at this temperature for 2-4 hours, filter and dry to obtain modified aluminum hydroxide; A2: Hollow glass microspheres and heptadecafluorodecyltrimethoxysilane solution were mixed, ultrasonically dispersed at room temperature for 0.5-1 h, filtered and dried to obtain modified hollow glass microspheres; A3: Hydroxylated boron nitride sheets and KH550 solution are mixed, and the reaction is carried out at a controlled temperature of 100-110℃ for 4-8 hours to obtain modified boron nitride; A4: Modified aluminum hydroxide, modified hollow glass microspheres, and modified boron nitride are blended to obtain an organic composite filler.

2. The anti-aging power metering box cabinet material according to claim 1, characterized in that, The addition ratio of dopamine-modified glass fiber, anhydrous ethanol, deionized water, tetraethyl orthosilicate, and cetyltrimethylammonium bromide in S1 is 10g: 80-160mL: 20-40mL: 0.5-1g: 0.05-0.15g.

3. The anti-aging power metering box cabinet material according to claim 1, characterized in that, The addition ratio of S2 mesoporous SiO2-encapsulated glass fiber, boron nitride nanosheets, anhydrous ethanol, and deionized water is 10g:0.5-1g:100mL-200mL:100mL-200mL.

4. The anti-aging power metering box cabinet material according to claim 1, characterized in that, The addition ratio of double-layered glass fiber, ethanol, deionized water, and heptadecafluorodecyltrimethoxysilane in S3 is 10g: 60-80mL: 20-40mL: 0.1-0.2g.

5. The anti-aging power metering box cabinet material according to claim 1, characterized in that, In A1, the KH560 solution is a 3-5 wt% KH560 silane ethanol aqueous solution, with a volume ratio of ethanol to water of 9:1; the addition ratio of aluminum hydroxide to KH560 solution is 10 g: 30-50 mL. In A2, the heptadecanodecyltrimethoxysilane solution is a 5-10 wt% heptadecanodecyltrimethoxysilane acetone solution; the addition ratio of 10g hollow glass microspheres to 30-50mL heptadecanodecyltrimethoxysilane solution is 10g:30-50mL. In A3, hydroxylated boron nitride tablets are obtained by reflux oxidation of boron nitride tablets with concentrated nitric acid for 2 hours; the KH550 toluene solution is 5-10 wt% KH550 toluene solution; the addition ratio of hydroxylated boron nitride tablets to KH550 solution is 10 g: 30-60 mL; The mass ratio of modified aluminum hydroxide, modified hollow glass microspheres, and modified boron nitride in A4 is 60-70:15-20:5-15.

6. The anti-aging power metering box cabinet material according to claim 1, characterized in that, The unsaturated polyester resin is composed of one or more of the following: orthophthalic resin, isophthalic resin, and vinyl ester resin; The initiator is one or more of tert-butyl peroxide and tert-butyl peroxide-2-ethylhexanoate; The low-shrinkage agent is composed of one or more of the following: polystyrene low-shrinkage agent, polyvinyl acetate low-shrinkage agent, polycaprolactone low-shrinkage agent, and saturated polyester resin low-shrinkage agent.

7. The anti-aging power metering box cabinet material according to claim 1, characterized in that, The additives include polymerization inhibitors, release agents, and thickeners; The polymerization inhibitor accounts for 0.01%-0.02% of the total mass of the cabinet material; the polymerization inhibitor is composed of one or more of phenol, hydroquinone, tert-butylcatechol, 2-tert-butylhydroquinone, 2,5-di-tert-butylhydroquinone, 2,6-di-tert-butyl-p-cresol, and 2,6-di-tert-butyl-4-methylphenol. The release agent accounts for 1%-3% of the total mass of the cabinet material; the release agent is composed of one or more of calcium stearate, zinc stearate, and magnesium stearate; The thickener accounts for 1%-5% of the total mass of the cabinet material; the thickener is composed of one or more of magnesium oxide, magnesium hydroxide, calcium oxide and calcium hydroxide.

8. The anti-aging power metering box cabinet material according to claim 7, characterized in that, The cabinet material also includes colorants and wetting agents; the colorants account for 2-4% of the total mass of the cabinet material. The wetting agent accounts for 1-2% of the total mass of the cabinet material; the wetting agent is one or a mixture of two of BYK-W9010 and BYK-W996.

9. The anti-aging power metering box cabinet material according to claim 1, characterized in that, The method for preparing the cabinet material includes the following steps: mixing and molding the raw materials according to the raw material mass distribution ratio to obtain the cabinet material.

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