Insulating boom and preparation method therefor

Abstract

The present application relates to an insulating boom and a preparation method therefor, and further relates to an aerial platform truck comprising the insulating boom. The insulating boom comprises an insulating boom body, the insulating boom body comprises fibers and resin, the fibers comprise basalt fibers and glass fibers, and filaments of the fibers are bonded by the resin. The insulating boom has high rigidity and high insulation properties and can maintain a high insulation effect after exposure to rain, thereby effectively improving the reliability of equipment in complex environments.

Description

An insulated boom and its preparation method

[0001] Cross-referencing

[0002] This application is based on and claims priority to Chinese application No. 202411868892.7, filed on December 18, 2024, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] This application belongs to the field of engineering machinery, specifically relating to an insulated boom and its manufacturing method, and also to an aerial work platform including the insulated boom. Background Technology

[0004] Insulated boom trucks were initially introduced to the power industry as special vehicles for intermediate potential operations in locations with convenient transportation and complex wiring. With the development of the power industry and continuous technological advancements, insulated boom trucks have undergone numerous technological breakthroughs and product upgrades. Their operating height has increased from a few meters or tens of meters initially to 25 meters or even higher now, placing higher technical demands on the performance of the insulated section of the main boom. Currently, regardless of whether it's a telescopic or folding insulated boom truck, its final boom section is insulated, ranging in length from 1 to 6 meters. This section needs to possess extremely high bending strength, torsional strength, and excellent insulation performance. The application fields of insulated boom trucks are becoming increasingly widespread, and they are being rapidly promoted to industries such as railways and communications. However, the insulation section is susceptible to environmental factors such as rain, dew, and frost, leading to a decrease in insulation performance and a reduction in the uptime of insulated boom trucks.

[0005] Currently, most insulated booms on the market are made of glass fiber as the reinforcing phase and resin as the continuous phase, cured by a wet winding process. Due to the limitations of this wet winding process, the angle between the fiber arrangement direction and the central axis of the mold is usually greater than 5°, which cannot fully utilize the high axial strength and high modulus characteristics of the fibers. In terms of insulation, a gel coat is typically applied to the outer surface. The styrene contained in the gel coat is detrimental to the health of workers and also causes significant environmental pollution.

[0006] Therefore, the boom needs to be improved to ensure its working stability and insulation performance. Summary of the Invention

[0007] The purpose of this application is to improve the rigidity of an insulated boom, and to provide an insulated boom, a method for manufacturing the insulated boom, and an aerial work platform.

[0008] In some embodiments, an insulated boom is provided for aerial work platforms (e.g., insulated bucket trucks). This insulated boom has high rigidity and insulation, and can maintain a high insulation effect even after being rained on, thereby effectively improving the reliability of the equipment in complex environments.

[0009] The first aspect of this application relates to an insulated boom, including an insulated boom body comprising fibers and resin, the fibers comprising basalt fibers and glass fibers, the fiber bundles being bonded together by the resin.

[0010] By combining rigid basalt fiber with glass fiber, the rigidity of the insulated boom is improved, while retaining glass fiber can improve the bond strength between the fiber and the resin.

[0011] In some embodiments, the insulated boom includes a hollow insulated boom body, which includes alternating layers of basalt fiber reinforced resin and glass fiber reinforced resin. Preferably, the thickness of the basalt fiber reinforced resin layer is 1 to 6 times the thickness of the glass fiber reinforced resin layer, more preferably 2 to 5 times, and even more preferably 3 to 4 times.

[0012] In some embodiments, the number of basalt fiber layers in each basalt fiber reinforced resin layer is n1, and the number of glass fiber layers in each glass fiber reinforced resin layer is n2. The ratio of n1 / n2 is between 1 and 6, preferably between 2 and 5, such as 2, 3, 4 or 5.

[0013] In some implementations, the surface of basalt fibers is often subjected to plasma etching.

[0014] Some embodiments of this application relate to an insulated boom for an aerial work platform (e.g., an insulated bucket truck), comprising a hollow insulated boom body, the hollow insulated boom body being composed of alternating layers of basalt fiber reinforced resin and glass fiber reinforced resin, the thickness of the basalt fiber reinforced resin layer being 1 to 6 times the thickness of the glass fiber reinforced resin layer, the glass fiber reinforced resin layer having a resin matrix and a glass fiber skeleton, and the resin matrix and glass fiber being bonded together to form an integral layered structure; the basalt fiber reinforced resin layer having a resin matrix and a basalt fiber skeleton, and the resin matrix and basalt fiber being bonded together to form an integral layered structure, wherein the surface of the basalt fiber is subjected to atmospheric pressure plasma etching treatment.

[0015] In some embodiments, the surface of the basalt fiber is etched with atmospheric pressure plasma at a voltage of 20V to 60V for a processing time of 3s to 10s.

[0016] In some embodiments, the thickness of the basalt fiber reinforced resin layer is 2 to 5 times the thickness of the glass fiber reinforced resin layer.

[0017] In some embodiments, the thickness of the basalt fiber reinforced resin layer is 3 to 4 times the thickness of the glass fiber reinforced resin layer.

[0018] In some embodiments, the glass fiber is Grade E glass fiber.

[0019] In some embodiments, the glass fiber satisfies any one or more of the following conditions: linear density of 2400 tex to 4800 tex, single fiber diameter of 14 to 17 μm, and resistivity ≥ 1 × 10⁻⁶. 11 Ω·m, moisture content ≤0.10%, combustible content ≤0.5%, elastic modulus ≥75GPa.

[0020] In some embodiments, the basalt fibers satisfy any one or more of the following conditions: linear density of 2400 tex to 4800 tex, single fiber diameter of 13 to 16 μm, and resistivity ≥ 1 × 10⁻⁶. 12 Ω·m, moisture content ≤0.10%, combustible content ≤0.5%, elastic modulus ≥90GPa.

[0021] In some embodiments, the atmospheric pressure plasma is an atmospheric pressure plasma formed from argon, carbon dioxide, oxygen, methane, acetylene, or air.

[0022] In some embodiments, the resin includes epoxy resin and / or vinyl ester resin, preferably epoxy resin or vinyl ester resin.

[0023] In some embodiments, the flexural strength of the resin is ≥140 MPa.

[0024] In some embodiments, the curing agent used for resin curing is an aromatic amine curing agent (such as diaminodiphenyl sulfone, diaminodiphenylmethane), an acid anhydride curing agent (such as methylnadic anhydride, methyltetrahydrophthalic anhydride, methylhexahydrophthalic anhydride), or a peroxide curing agent (such as isobutyl ketone peroxide, cyclohexanone oxide, methyl ethyl ketone peroxide, benzoyl peroxide, propylbenzene peroxide), and the reaction promoter used for resin curing is cobalt naphthenate, cobalt isooctanoate, dimethylaniline, or diethylaniline.

[0025] In some embodiments, the curing agent is isobutyl ketone peroxide, and the reaction promoter is cobalt isooctanoate.

[0026] In some embodiments, the weight ratio of the resin to the curing agent and the accelerator is 100:(0.8-4):(0.05-3). In some embodiments, the weight ratio of the resin to the curing agent and the accelerator is 100:(1-3):(0.1-2.5). In some embodiments, the weight ratio of the resin to the curing agent and the accelerator is 100:(1.25-3):(0.1-2.2).

[0027] In some embodiments, the viscosity of the resin before curing is 400–450 CP·S.

[0028] In some embodiments, the angle between the basalt fiber and the central axis of the insulating boom is -5° to 5°, preferably -1° to 1°.

[0029] In some embodiments, the angle between the glass fiber and the central axis of the insulating arm is 85°-95°, preferably 88°-92°.

[0030] In some embodiments, the basalt fibers are distributed in the resin matrix parallel to the central axis of the insulating boom, and the glass fibers are uniformly distributed in the resin matrix perpendicular to the central axis of the insulating boom.

[0031] In some implementations, the insulating boom also includes a hydrophobic coating disposed on the outer surface of the insulating boom body.

[0032] In some embodiments, the outer surface of the hollow insulating arm is frequently subjected to plasma pressure treatment.

[0033] In some embodiments, the atmospheric pressure plasma is an atmospheric pressure plasma formed from argon, carbon dioxide, oxygen, methane, acetylene, or air.

[0034] In some embodiments, the outer surface of the hollow insulating arm is subjected to atmospheric pressure plasma treatment at a voltage of 20V to 40V for 10 to 15 minutes.

[0035] In some embodiments, the insulating boom further includes a coating applied to the outer surface of the hollow insulating boom body.

[0036] In some embodiments, the coating comprises an organosilicon material and nano-silica.

[0037] In some implementations, the coating is formed by paint.

[0038] This application also relates to a method for preparing the aforementioned insulating boom, comprising:

[0039] 1) Apply release agent to the surface of the core mold;

[0040] 2) The resin-impregnated fiber bundles are laid on the mandrel, wherein basalt fibers (preferably along the direction parallel to the central axis of the mandrel, where the parallelism is allowed to be within 5°) and glass fibers (preferably along the direction perpendicular to the central axis of the mandrel, where the perpendicularity is allowed to be within 5°) are laid. For every 1 to 6 layers (preferably 2 to 5 layers, 3 to 4 layers, for example 3, 4 or 5 layers) of basalt fibers, one layer of glass fiber is laid, and the total thickness of the laying is 12 mm to 17 mm, for example about 14 mm, about 15 mm, or about 16 mm.

[0041] 3) Use an external mold to compact the fiber matrix obtained in step 2) and remove excess resin;

[0042] 4) Curing, the curing temperature is preferably 80-140℃, the curing time is preferably 2-4h, and the curing temperature is even more preferably 90-120℃, the curing time is preferably 2-3h, to obtain a hollow insulating arm;

[0043] 5) Optionally, the outer surface of the hollow insulating arm is flattened.

[0044] In some implementations, the layup tension in step 2) is controlled at 20% to 25% of the fiber strength.

[0045] In some implementations, in step 2), the angle between the basalt fiber and the central axis of the mandrel is -1° to +1°, and the angle between the glass fiber and the central axis of the mandrel is 85° to 95°.

[0046] In some embodiments, the method for preparing the insulating boom further includes:

[0047] 6) Treat the outer surface of the hollow insulating arm with atmospheric pressure plasma;

[0048] 7) Spray paint to form a coating on the outer surface of the hollow insulating arm.

[0049] In some implementations, the basalt fiber is a basalt fiber with a surface that has been subjected to frequent pressure plasma etching.

[0050] In some embodiments, the surface of the preferred basalt fiber is etched with atmospheric pressure plasma at a voltage of 20V to 60V for a processing time of 3s to 10s.

[0051] In some embodiments, the coating comprises a silicone coating, hydrophobic nano-silica, and acetone, preferably the coating is made of a silicone coating, hydrophobic nano-silica, and acetone.

[0052] In some embodiments, the weight ratio of the silicone coating to acetone in the coating is 1:0.8 to 1.2, for example, 1:1. In some embodiments, the amount of hydrophobic nano-silica added to the coating is 1% to 5% of the sum of the weights of the silicone coating and acetone.

[0053] In some embodiments, the method for preparing the coating includes:

[0054] 1) Mix the silicone coating with acetone until homogeneous;

[0055] 2) Add hydrophobic nano-silica to the mixture obtained in 1) and mix thoroughly.

[0056] In some embodiments, in step 2), the mixture is stirred at a speed of 200-500 rpm (e.g., 300 rpm) for 15-25 h (e.g., 20 h) to ensure that the hydrophobic nano-silica is uniformly mixed with the mixture obtained in step 1).

[0057] This application also relates to an aerial work platform vehicle (e.g., an insulated boom truck) including the insulated boom described in this application.

[0058] Beneficial technical effects of some implementation schemes of this application

[0059] Compared to conventional insulated booms, the insulated booms provided in this application have significantly improved rigidity and insulation. In particular, some embodiments of this application's insulated booms can maintain a high insulation effect after being rained on, thereby effectively improving the reliability of the equipment in complex environments.

[0060] In this application, the "insulated boom" is a hollow boom profile made of insulating material, the cross-section of which can be rectangular or circular, serving as a load-bearing and insulating component, and is used in aerial work vehicles with insulated booms, such as insulated bucket boom vehicles, to achieve safe operation on high-voltage live conductors.

[0061] In this application, the "E-grade glass fiber" is also known as alkali-free glass fiber, which refers to glass fiber with an alkali metal oxide content of no more than 1%, preferably glass fiber with an alkali metal oxide content of no more than 0.8%, and more preferably glass fiber with an alkali metal oxide content of no more than 0.5%.

[0062] In this application, the "organosilicon coating" generally refers to a coating formulated with an organosilicon resin made by copolymerizing dichlorosilane and trichlorosilane as a base material, which has excellent oxidation resistance, UV resistance and gloss retention, and is commercially available. Attached Figure Description

[0063] Figure 1 is a longitudinal cross-sectional schematic diagram of the insulating boom metal core mold in the embodiment of this application. Its cross-section can be circular or rectangular. The direction parallel to the core mold rotation axis is set to 0°, and the direction perpendicular to the core mold rotation axis is set to 90°.

[0064] Figure 2 is a schematic diagram of the cross-sectional structure of the insulating boom according to an embodiment of this application, where 1 represents the glass fiber layer and 2 represents the basalt fiber layer. The two are alternately laid and wound to form the matrix of the insulating boom.

[0065] Figure 3 is a schematic diagram of the structure of the plasma generator used for processing basalt fibers in an embodiment of this application, wherein 1 represents a high-voltage electrode, 2 represents a low-voltage electrode, 3 represents quartz glass, 4 represents the basalt fiber to be processed, 5 represents the inlet gas, and 6 represents the outlet gas. Detailed Implementation

[0066] The following specific embodiments further illustrate the substantive content of this application. It should be understood that the following embodiments are for illustrative purposes only and are not intended to limit the scope of protection of this application. In the following embodiments, unless specific conditions are specified, conventional conditions or manufacturer recommendations are followed. Raw materials whose manufacturers are not specified are all commercially available conventional products.

[0067] While many of the materials and operating methods used in the following embodiments are well known in the art, this application still describes them in as much detail as possible. It will be apparent to those skilled in the art that, unless otherwise stated, the materials and operating methods used in the following embodiments are well known in the art.

[0068] In this embodiment, the plasma generator used to process the outer surface of the hollow insulating arm is a low-temperature plasma generator, purchased from Nanjing Suman Electronics Co., Ltd., CTP-2000K.

[0069] Figure 1 shows a schematic diagram of the longitudinal section of the metal core mold of the insulating arm used in this embodiment. Its cross-section can be circular or rectangular. The direction parallel to the core mold rotation axis is set to 0°, and the direction perpendicular to the core mold rotation axis is set to 90°.

[0070] Figure 3 shows a schematic diagram of the plasma generator used to process basalt fibers in this embodiment of the application, where 1 represents a high-voltage electrode, 2 represents a low-voltage electrode, 3 represents quartz glass, 4 represents the basalt fiber to be processed, 5 represents the inlet gas, and 6 represents the outlet gas.

[0071] As shown in Figure 2, this application embodiment provides an insulated boom, including an insulated boom body, which includes fibers and resin. The fibers include basalt fibers and glass fibers, and the fiber bundles are bonded together by resin.

[0072] By combining rigid basalt fiber with glass fiber, the rigidity of the insulated boom is improved, while retaining glass fiber can improve the bond strength between the fiber and the resin.

[0073] In some embodiments, the insulated boom includes a hollow insulated boom body comprising alternating layers of basalt fiber reinforced resin and glass fiber reinforced resin. Preferably, the thickness of the basalt fiber reinforced resin layer is 1 to 6 times, more preferably 2 to 5 times, and even more preferably 3 to 4 times, the thickness of the glass fiber reinforced resin layer. This arrangement allows the basalt fiber and glass fiber to be concentrated at a certain thickness to leverage their respective advantages.

[0074] In some embodiments, the number of basalt fiber layers in each basalt fiber reinforced resin layer is n1, and the number of glass fiber layers in each glass fiber reinforced resin layer is n2. The ratio of n1 / n2 is between 1 and 6, preferably between 2 and 5, such as 2, 3, 4, or 5. The arrangement of the number of fiber layers allows the advantages of each fiber to be fully utilized.

[0075] In some implementations, the surface of basalt fibers is frequently subjected to plasma etching.

[0076] In some embodiments, an insulated boom for an aerial work platform (e.g., an insulated bucket truck) is provided, comprising a hollow insulated boom body composed of alternating layers of basalt fiber reinforced resin layer 2 and glass fiber reinforced resin layer 1. The thickness of the basalt fiber reinforced resin layer 2 is 1 to 6 times the thickness of the glass fiber reinforced resin layer 1. The glass fiber reinforced resin layer 1 has a resin matrix and a glass fiber skeleton, with the resin matrix and glass fiber bonded together to form an integral layered structure. The basalt fiber reinforced resin layer 2 has a resin matrix and a basalt fiber skeleton, with the resin matrix and basalt fiber bonded together to form an integral layered structure. The surface of the basalt fiber is subjected to atmospheric pressure plasma etching.

[0077] Compared to pure glass fiber, using a combination of glass fiber and basalt fiber to form the insulating arm significantly improves the arm's stiffness and insulation performance. Furthermore, surface treatment with atmospheric pressure plasma etching enhances the compatibility between the basalt fiber and resin, while also significantly strengthening the bond between them. This results in a substantial improvement in the rigidity and insulation of the insulating arm, better isolating current and reducing the risk of leakage and burns.

[0078] In some embodiments, the surface of the basalt fiber is etched with atmospheric pressure plasma at a voltage of 20V to 60V for a processing time of 3 to 10 seconds.

[0079] In some embodiments, the thickness of the basalt fiber reinforced resin layer is 2 to 5 times the thickness of the glass fiber reinforced resin layer.

[0080] In some embodiments, the thickness of the basalt fiber reinforced resin layer is 3 to 4 times the thickness of the glass fiber reinforced resin layer.

[0081] In some embodiments, the glass fiber is Grade E glass fiber.

[0082] In some embodiments, the glass fiber satisfies any one or more of the following conditions: linear density of 2400 tex to 4800 tex, single fiber diameter of 14 to 17 μm, and resistivity ≥ 1 × 10⁻⁶. 11Ω·m, moisture content ≤0.10%, combustible content ≤0.5%, elastic modulus ≥75GPa.

[0083] In some embodiments, the basalt fibers satisfy any one or more of the following conditions: linear density of 2400 tex to 4800 tex, single fiber diameter of 13 to 16 μm, and resistivity ≥ 1 × 10⁻⁶. 12 Ω·m, moisture content ≤0.10%, combustible content ≤0.5%, elastic modulus ≥90GPa.

[0084] In some embodiments, the atmospheric pressure plasma is an atmospheric pressure plasma formed from argon, carbon dioxide, oxygen, methane, acetylene, or air.

[0085] In some embodiments, the resin is an epoxy resin or a vinyl ester resin. Exemplary epoxy resins selected include Nan Ya NPPN-638S, Shangwei 2513, Phoenix WSR6101, and Zhenzhengfeng MF-4101; exemplary vinyl ester resins selected include Liliansi 430, Liliansi 590Z, Shangwei 901, and INEOS DM510C-350HOI.

[0086] In some embodiments, the flexural strength of the resin is ≥140 MPa.

[0087] In some embodiments, the curing agent used for resin curing is an aromatic amine curing agent (such as diaminodiphenyl sulfone, diaminodiphenylmethane), an acid anhydride curing agent (such as methylnadic anhydride, methyltetrahydrophthalic anhydride, methylhexahydrophthalic anhydride), or a peroxide curing agent (such as isobutyl ketone peroxide, cyclohexanone oxide, methyl ethyl ketone peroxide, benzoyl peroxide, propylbenzene peroxide), and the reaction promoter used for resin curing is cobalt naphthenate, cobalt isooctanoate, dimethylaniline, or diethylaniline.

[0088] In some embodiments, the curing agent is isobutyl ketone peroxide, and the reaction promoter is cobalt isooctanoate.

[0089] In some embodiments, the weight ratio of the resin to the curing agent and the accelerator is 100:(0.8-4:(0.05-3). In some embodiments, the weight ratio of the resin to the curing agent and the accelerator is 100:(1-3):(0.1-2.5). In some embodiments, the weight ratio of the resin to the curing agent and the accelerator is 100:(1.25-3):(0.1-2.2).

[0090] In some implementations, the angle between the basalt fiber and the central axis of the insulated boom is -5° to 5°, preferably -1° to 1°. By designing higher rigidity basalt fiber to be laid up in the above direction, the bending stiffness of the insulated boom is significantly improved, and its deformation under load is reduced.

[0091] In some embodiments, the angle between the glass fiber and the central axis of the insulating arm is 85°-95°, preferably 88°-92°.

[0092] It should be noted that the positive angles above represent the angles formed by rotating counterclockwise with the central axis of the insulated boom as the starting line, while the negative angles above represent the angles formed by rotating clockwise with the central axis of the insulated boom as the starting line.

[0093] In some embodiments, the basalt fibers are distributed in the resin matrix parallel to the central axis of the insulating boom, and the glass fibers are uniformly distributed in the resin matrix perpendicular to the central axis of the insulating boom.

[0094] In some embodiments, the insulated boom further includes a hydrophobic coating applied to the outer surface of the insulated boom body. The hydrophobic coating effectively addresses the degradation of insulation performance caused by harsh environments such as rain, dew, and frost, thereby improving the safe operation of the equipment. In some embodiments, the outer surface of the hollow insulated boom body is subjected to frequent plasma pressure treatment.

[0095] In some embodiments, the atmospheric pressure plasma is an atmospheric pressure plasma formed from argon, carbon dioxide, oxygen, methane, acetylene, or air.

[0096] In some embodiments, the outer surface of the hollow insulating arm is subjected to atmospheric pressure plasma treatment at a voltage of 20V to 40V for 10 to 15 minutes.

[0097] In some embodiments, the insulating boom further includes a coating applied to the outer surface of the hollow insulating boom body.

[0098] After the outer surface of the hollow insulating arm is treated with atmospheric pressure plasma, the adhesion between the outer surface and the coating is enhanced, thereby improving the hydrophobic effect of the coating.

[0099] In some embodiments, the coating comprises a silicone material and nano-silica, preferably hydrophobic nano-silica. The silicone material exhibits excellent oxidation resistance, UV resistance, and gloss retention, thus improving the weather resistance of the insulating boom.

[0100] In some implementations, it is formed by coating.

[0101] This application also provides a method for preparing the aforementioned insulating boom, comprising:

[0102] 1) Apply release agent to the surface of the core mold;

[0103] 2) The resin-impregnated fiber bundles are laid on the mandrel, wherein basalt fibers (preferably along the direction parallel to the central axis of the mandrel, where the parallelism is allowed to be within 5°) and glass fibers (preferably along the direction perpendicular to the central axis of the mandrel, where the perpendicularity is allowed to be within 5°) are laid. For every 1 to 6 layers (preferably 2 to 5 layers, 3 to 4 layers, for example 3, 4 or 5 layers) of basalt fibers, one layer of glass fiber is laid, and the total thickness of the laying is 12 mm to 17 mm, for example about 14 mm, about 15 mm, or about 16 mm.

[0104] 3) Use an external mold to compact the fiber matrix obtained in step 2) and remove excess resin;

[0105] 4) Curing, the curing temperature is preferably 80-140℃, the curing time is preferably 2-4h, and the curing temperature is even more preferably 90-120℃, the curing time is preferably 2-3h, to obtain a hollow insulating arm;

[0106] 5) Optionally, the outer surface of the hollow insulating arm is flattened.

[0107] In some embodiments, the viscosity of the resin before curing is 400–450 CP·S.

[0108] In some implementations, the layup tension in step 2) is controlled at 20% to 25% of the fiber strength.

[0109] In some implementations, in step 2), the angle between the basalt fiber and the central axis of the mandrel is -1° to +1°, and the angle between the glass fiber and the central axis of the mandrel is 85° to 95°.

[0110] In some implementations, the basalt fiber is a basalt fiber with a surface treated by atmospheric pressure plasma etching. That is, before resin impregnation, the basalt fiber is treated by atmospheric pressure plasma etching, which enhances the adhesion between its outer surface and the resin, and can significantly improve the rigidity and insulation of the insulating arm.

[0111] In some implementations, the surface of the basalt fiber is etched with atmospheric pressure plasma at a voltage of 20V to 60V for a processing time of 3s to 10s.

[0112] In some embodiments, the method for preparing the insulating boom further includes:

[0113] 6) Treat the outer surface of the hollow insulating arm with atmospheric pressure plasma;

[0114] 7) Spray paint to form a coating on the outer surface of the hollow insulating arm.

[0115] In some embodiments, the coating comprises a silicone coating, hydrophobic nano-silica, and acetone; preferably, the coating is made of a silicone coating, hydrophobic nano-silica, and acetone.

[0116] In some embodiments, the weight ratio of the silicone coating to acetone in the coating is 1:0.8 to 1.2, for example, 1:1. In some embodiments, the amount of hydrophobic nano-silica added to the coating is 1% to 5% of the sum of the weights of the silicone coating and acetone.

[0117] In some embodiments, the method for preparing the coating includes:

[0118] 1) Mix the silicone coating with acetone until homogeneous;

[0119] 2) Add hydrophobic nano-silica to the mixture obtained in 1) and mix thoroughly.

[0120] In some embodiments, in step 2), the mixture is stirred at a speed of 200-500 rpm (e.g., 300 rpm) for 15-25 h (e.g., 20 h) to ensure that the hydrophobic nano-silica is uniformly mixed with the mixture obtained in step 1).

[0121] This application also provides an aerial work platform vehicle (e.g., an insulated boom truck) including the insulated boom described in this application. This aerial work platform vehicle has a rigid boom with high insulation properties, maintaining a high level of insulation even after being rained on.

[0122] Example 1

[0123] 1. Prepare raw materials

[0124] The reinforcing fibers are glass fiber and basalt fiber. The glass fiber is grade E glass fiber with a linear density of 2400 tex, a single fiber diameter of 16 μm, and a resistivity of 1.2 × 10⁻⁶. 11 The fiber content is 0.10% Ω·m, combustible content is 0.5%, and elastic modulus is 75 GPa (purchased from Taian Jufusheng New Material Co., Ltd., Taishan Fiberglass TCR910-2400-17); basalt fiber linear density is 2400 tex, single fiber diameter is 16 μm, and resistivity is 5.5 × 10⁻⁶. 12 The basalt fiber has an Ω·m content, a moisture content of 0.10%, a combustible content of 0.5%, and an elastic modulus of 97 GPa (purchased from Guizhou Shixin Basalt Technology Co., Ltd., untwisted roving 2400 tex). Before use, the surface of the basalt fiber is etched with atmospheric pressure oxygen plasma at a voltage of 20V for 10s.

[0125] The resin is Liliansi 590Z, the curing agent is isobutyl ketone peroxide, and the accelerator is cobalt isooctanoate. The weight ratio of resin, curing agent, and accelerator is 100:2:1.2.

[0126] The hydrophobic self-cleaning coating is made of silicone coating, hydrophobic nano-silica, and acetone. The preparation method is as follows: Silicone coating (purchased from Langfang Xiangteng Chemical Co., Ltd.) and acetone are mixed and stirred evenly at a weight ratio of 1:1. 1% by weight of hydrophobic nano-silica powder is then added to the resulting mixture, and the mixture is stirred continuously at 300 rpm for 20 hours to obtain the hydrophobic self-cleaning coating.

[0127] 2. Preparation of Insulating Boom

[0128] 1) Install the metal core mold on the integrated laying and winding machine, and evenly brush the release agent on the surface to ensure easy demolding after the boom is formed;

[0129] 2) Mix the resin, curing agent, and accelerator in the specified proportions using an automatic glue dispensing machine and inject them into the glue tank for later use in impregnating fiber bundles;

[0130] 3) Using an integrated winding machine, resin-impregnated fiber bundles are wound onto a metal mandrel according to the set winding angle and layer thickness. The winding tension is controlled at 20% of the fiber strength. Basalt fibers are wound along the central axis of the mandrel (i.e., the longitudinal section direction) at a winding angle of 0°. Glass fibers are wound along the direction perpendicular to the central axis of the mandrel (i.e., the cross-sectional direction) at a winding angle of 90°. Basalt fibers and glass fibers are wound alternately. Every 4 layers of basalt fibers are wound with 1 layer of glass fiber, for a total of 7 cycles. Among them, 28 layers of basalt fibers are wound and 7 layers of glass fibers are wound, with a total thickness of about 15mm.

[0131] 4) Use an external mold to compact and lock the fiber matrix sample obtained in step 3), and remove excess resin;

[0132] 5) Transfer the sample obtained in step 4) into an oven for curing. The curing temperature is 95℃ and the curing time is 2.5h.

[0133] 6) Remove the cured sample from the mold and polish and repair any burrs, bumps and uneven parts on the surface;

[0134] 7) The sample obtained in step 6) was surface treated with atmospheric pressure carbon dioxide plasma at a voltage of 30V for 10 minutes. Then, a hydrophobic self-cleaning coating was sprayed to form a hydrophobic coating with a thickness of 150μm. After drying, the insulating arm of this embodiment was obtained.

[0135] Example 2

[0136] 1. Prepare raw materials

[0137] The reinforcing fibers are glass fiber and basalt fiber. The glass fiber is grade E glass fiber with a linear density of 4800 tex, a single fiber diameter of 16 μm, and a resistivity of 1.5 × 10⁻⁶. 11 Ω·m, moisture content 0.10%, combustible content 0.5%, elastic modulus 79 GPa (purchased from Taian Jufusheng New Materials Co., Ltd., Taishan EDR480); basalt fiber linear density 4800 tex, single fiber diameter 16 μm, resistivity 5.5 × 10 ... 12 The basalt fiber has an Ω·m content, a moisture content of 0.10%, a combustible content of 0.5%, and an elastic modulus of 99 GPa (purchased from Guizhou Shixin Basalt Technology Co., Ltd., untwisted roving 4800 tex). Before use, the surface of the basalt fiber is etched with atmospheric pressure methane plasma at a voltage of 60V for 3 seconds.

[0138] The resin is INEOS DM510C-350HOI, the curing agent is isobutyl ketone peroxide, and the accelerator is cobalt isooctanoate. The weight ratio of resin, curing agent, and accelerator is 100:1.25:0.1.

[0139] The hydrophobic self-cleaning coating is made of silicone coating, hydrophobic nano-silica, and acetone. The preparation method is as follows: mix the silicone coating and acetone in a 1:1 weight ratio and stir until homogeneous. Add 3% by weight of hydrophobic nano-silica powder to the resulting mixture and stir continuously at 300 rpm for 20 hours to obtain the hydrophobic self-cleaning coating.

[0140] 2. Preparation of Insulating Boom

[0141] 1) Install the metal core mold on the integrated laying and winding machine, and evenly brush the release agent on the surface to ensure easy demolding after the boom is formed;

[0142] 2) Mix the resin, curing agent, and accelerator in the specified proportions using an automatic glue dispensing machine and inject them into the glue tank for later use in impregnating fiber bundles;

[0143] 3) Using an integrated winding machine, resin-impregnated fiber bundles are wound onto a metal mandrel according to the set winding angle and layer thickness. The winding tension is controlled at 22% of the fiber strength. Basalt fibers are wound along the central axis of the mandrel (i.e., the longitudinal section direction) at a winding angle of 0°. Glass fibers are wound along the direction perpendicular to the central axis of the mandrel (i.e., the cross-sectional direction) at a winding angle of 90°. Basalt fibers and glass fibers are wound alternately. Every 4 layers of basalt fibers are wound with 1 layer of glass fiber, for a total of 7 cycles. Among them, 28 layers of basalt fibers are wound and 7 layers of glass fibers are wound, with a total thickness of about 15mm.

[0144] 4) Use an external mold to compact and lock the fiber matrix sample obtained in step 3), and remove excess resin;

[0145] 5) Transfer the sample obtained in step 4) into an oven for curing. The curing temperature is 95℃ and the curing time is 2.5h.

[0146] 6) Remove the cured sample from the mold and polish and repair any burrs, bumps and uneven parts on the surface;

[0147] 7) The sample obtained in step 6) was surface treated with atmospheric pressure carbon dioxide plasma at a voltage of 20V for 15 minutes. Then, a hydrophobic self-cleaning coating was sprayed to form a hydrophobic coating with a thickness of 150μm. After drying, the insulating arm of this embodiment was obtained.

[0148] Example 3

[0149] 1. Prepare raw materials

[0150] The reinforcing fibers are glass fiber and basalt fiber. The glass fiber is grade E glass fiber with a linear density of 4800 tex, a single fiber diameter of 17 μm, and a resistivity of 2.5 × 10⁻⁶. 11 Ω·m, moisture content 0.10%, combustible content 0.5%, elastic modulus 80GPa (purchased from Chongqing International Composite Materials Co., Ltd., untwisted roving 4800tex); basalt fiber linear density 4800tex, single fiber diameter 14μm, resistivity 3.5×10 12 The basalt fiber has an Ω·m content, a moisture content of 0.10%, a combustible content of 0.5%, and an elastic modulus of 97 GPa (purchased from Sichuan Tianrun Basalt Technology Co., Ltd., untwisted roving 4800 tex). Before use, the surface of the basalt fiber is etched with atmospheric pressure air plasma at a voltage of 40V for 7s.

[0151] The resin is Nan Ya NPPN-638S, the curing agent is isobutyl ketone peroxide, and the accelerator is cobalt isooctanoate. The weight ratio of resin, curing agent, and accelerator is 100:3:2.2.

[0152] The hydrophobic self-cleaning coating is made of silicone coating, hydrophobic nano-silica, and acetone. The preparation method is as follows: mix the silicone coating and acetone in a 1:1 weight ratio and stir until homogeneous. Add 5% by weight of hydrophobic nano-silica powder to the resulting mixture and stir continuously at 300 rpm for 20 hours to obtain the hydrophobic self-cleaning coating.

[0153] 2. Preparation of Insulating Boom

[0154] 1) Install the metal core mold on the integrated laying and winding machine, and evenly brush the release agent on the surface to ensure easy demolding after the boom is formed;

[0155] 2) Mix the resin, curing agent, and accelerator in the specified proportions using an automatic glue dispensing machine and inject them into the glue tank for later use in impregnating fiber bundles;

[0156] 3) Using an integrated winding machine, resin-impregnated fiber bundles are wound onto a metal mandrel according to the set winding angle and layer thickness. The winding tension is controlled at 25% of the fiber strength. Basalt fibers are wound along the central axis of the mandrel (i.e., the longitudinal section direction) at a winding angle of 0°. Glass fibers are wound along the direction perpendicular to the central axis of the mandrel (i.e., the cross-sectional direction) at a winding angle of 90°. Basalt fibers and glass fibers are wound alternately. Every 4 layers of basalt fibers are wound with 1 layer of glass fiber, for a total of 7 cycles. The total thickness is approximately 15mm.

[0157] 4) Use an external mold to compact and lock the fiber matrix sample obtained in step 3), and remove excess resin;

[0158] 5) Transfer the sample obtained in step 4) into an oven for curing at 105℃ for 2 hours.

[0159] 6) Remove the cured sample from the mold and polish and repair any burrs, bumps and uneven parts on the surface;

[0160] 7) The sample obtained in step 6) was surface treated with atmospheric pressure carbon dioxide plasma at a voltage of 40V for 15 minutes. Then, a hydrophobic self-cleaning coating was sprayed to form a hydrophobic coating with a thickness of 150μm. After drying, the insulating arm of this embodiment was obtained.

[0161] Example 4

[0162] The only difference between the insulating boom in Example 4 and Example 1 is that the surface of the basalt fiber was not etched; all other raw material processes were the same as in Example 1.

[0163] Example 5

[0164] The only difference between the insulating boom in Example 5 and Example 1 is that, before spraying the hydrophobic self-cleaning coating, the sample obtained in step 6) is not surface-treated, but the hydrophobic self-cleaning coating is directly sprayed.

[0165] Comparative Example 1

[0166] The insulating boom of Comparative Example 1 differs from that of Example 1 only in the reinforcing fiber material; it uses E-grade glass fiber with etched surface (linear density 2400 tex, single fiber diameter 16 μm, resistivity 1.2 × 10⁻⁶). 11Ω·m, moisture content 0.10%, combustible content 0.5%, elastic modulus 75 GPa) to replace the surface-etched basalt fibers (linear density 2400 tex, single fiber diameter 16 μm, resistivity 5.5 × 10⁻⁶ Ω·m, water content 0.10%, combustible content 0.5%, elastic modulus 75 GPa) 12 The Ω·m, moisture content 0.10%, combustible content 0.5%, elastic modulus 97 GPa) and etching treatment and other raw material processes were the same as in Example 1. During fiber laying, E-grade glass fibers with etched surfaces were laid along the central axis of the mold (i.e., the longitudinal direction) at a layup angle of 0°; E-grade glass fibers without etched surfaces were laid along a direction perpendicular to the central axis of the mold (i.e., the cross-sectional direction) at a layup angle of 90°. E-grade glass fibers with etched surfaces and unetched glass fibers were alternately laid. For every 4 layers of etched E-grade glass fibers, 1 layer of unetched glass fiber was laid, for a total of 7 cycles. A total of 28 layers of etched E-grade glass fibers and 7 layers of unetched glass fibers were laid, with a total thickness of approximately 15 mm.

[0167] Comparative Example 2

[0168] The insulating boom of Comparative Example 2 differs from that of Example 1 only in the reinforcing fiber material; it uses basalt fiber with an unetched surface (linear density 2400 tex, single fiber diameter 16 μm, resistivity 5.5 × 10⁻⁶). 12 Ω·m, moisture content 0.10%, combustible content 0.5%, elastic modulus 97 GPa) to replace Class E glass fiber (linear density 2400 tex, single fiber diameter 16 μm, resistivity 1.2 × 10⁻⁶). 11 The raw materials and processes were the same as in Example 1, with an Ω·m content, a moisture content of 0.10%, a combustible content of 0.5%, and an elastic modulus of 75 GPa. During fiber laying, basalt fibers with etched surfaces were laid along the central axis of the mold (i.e., the longitudinal direction) at a layup angle of 0°, while unetched basalt fibers were laid perpendicular to the central axis of the mold (i.e., the cross-sectional direction) at a layup angle of 90°. Etched and unetched basalt fibers were alternately laid, with one layer of unetched basalt fiber laid for every four layers of etched basalt fibers. This process was repeated seven times, resulting in 28 layers of etched basalt fibers and 7 layers of unetched basalt fibers, for a total thickness of approximately 15 mm.

[0169] Comparative Example 3

[0170] The insulating boom of Comparative Example 3 differs from that of Example 1 in that it uses a different reinforcing fiber material, employing only one type of E-grade glass fiber (linear density 2400 tex, single fiber diameter 16 μm, resistivity 1.2 × 10⁻⁶). 11The reinforcing fiber is Ω·m, with a moisture content of 0.10%, a combustible content of 0.5%, and an elastic modulus of 75 GPa. The surface is not etched. The conventional winding method is used (the 0° layup is replaced with ±15° layup, and the rest of the layup method is the same as in Example 1, that is, 4 layers of ±15° layup and 1 layer of 90° layup, which is repeated 7 times, with 28 layers of ±15° layup and 7 layers of 90° layup, and the total layup thickness is 15 mm). No hydrophobic self-cleaning coating is sprayed. All other material processes are the same as in Example 1.

[0171] Experimental Example

[0172] The bending resistance and insulation performance of the insulated booms prepared in the above embodiments and comparative examples were tested, and the results are shown in Table 1.

[0173] Table 1. Performance comparison of booms prepared in the embodiments and comparative examples of this application.

[0174] The results showed that, compared to pure glass fiber, the combination of glass fiber and basalt fiber significantly improved the stiffness and insulation performance of the boom (Example vs. Comparative Examples 1 and 3); due to the high rigidity of basalt fiber, the bonding force between the fiber and resin was poor, leading to easy delamination between the fiber and resin, and therefore it could not be used alone as an insulating boom material (Comparative Example 2); unetched basalt fiber had poor compatibility with resin and poor bonding force with resin, resulting in limited improvement in the stiffness and insulation of the boom (Example 4); in booms without plasma surface treatment... The surface is coated with a hydrophobic coating, but the adhesion is poor and it cannot achieve a good hydrophobic effect. After the boom is exposed to rain and then naturally dried for 3 hours, the insulation performance drops significantly (Example 5). However, other properties are superior to those of the comparative example. The fiber arrangement angle, the selection of fiber materials, and the use of the hydrophobic coating all affect the rigidity and insulation of the boom. Compared with conventional insulated booms, the insulated boom of this application embodiment has significantly improved rigidity and insulation. In particular, the insulated boom of this application embodiment can maintain a high insulation effect after being exposed to rain, thereby effectively improving the reliability of the equipment in complex environments.

[0175] Although specific embodiments of this application have been described in detail, those skilled in the art will understand that various modifications and substitutions can be made to those details based on all the teachings disclosed, and such changes are all within the scope of protection of this application. The full scope of this application is given by the appended claims and any equivalents.

Claims

1. An insulated boom, comprising an insulated boom body, the insulated boom body comprising fibers and resin, the fibers comprising basalt fibers and glass fibers, the fiber bundles being bonded together by resin.

2. The insulated boom according to claim 1, wherein, The insulated boom includes a hollow insulated boom body, which includes alternating layers of basalt fiber reinforced resin and glass fiber reinforced resin. Preferably, the thickness of the basalt fiber reinforced resin layer is 1 to 6 times the thickness of the glass fiber reinforced resin layer, more preferably 2 to 5 times, and even more preferably 3 to 4 times. Preferably, the number of basalt fiber layers in each basalt fiber reinforced resin layer is n1, and the number of glass fiber layers in each glass fiber reinforced resin layer is n2, with n1 / n2 being between 1 and 6, preferably between 2 and 5.

3. The insulated boom according to claim 1 or 2, wherein, The device includes a hollow insulating arm, which is composed of alternating layers of basalt fiber reinforced resin and glass fiber reinforced resin. The thickness of the basalt fiber reinforced resin layer is 1 to 6 times that of the glass fiber reinforced resin layer. The glass fiber reinforced resin layer has a resin matrix and a glass fiber skeleton, with the resin matrix and glass fiber bonded together to form an integral layered structure. The basalt fiber reinforced resin layer has a resin matrix and a basalt fiber skeleton, with the resin matrix and basalt fiber bonded together to form an integral layered structure. The surface of the basalt fiber is subjected to atmospheric pressure plasma etching.

4. The insulating boom of claim 1 or 2, wherein the surface of the basalt fiber is subjected to frequent pressure plasma etching treatment.

5. The insulating boom according to any one of claims 1 to 4, wherein the surface of the basalt fiber is etched by atmospheric pressure plasma at a voltage of 20V to 60V for a processing time of 3s to 10s.

6. The insulated boom according to any one of claims 1 to 5, wherein the glass fiber is E-grade glass fiber. Preferably, the glass fiber satisfies any one or more of the following conditions: Linear density of 2400 tex to 4800 tex, single fiber diameter of 14 to 17 μm, resistivity ≥1×10 11 Ω·m, moisture content ≤0.10%, combustible content ≤0.5%, elastic modulus ≥75GPa.

7. The insulating boom according to any one of claims 1 to 6, wherein the basalt fiber yarn satisfies any one or more of the following conditions: density of 2400 tex to 4800 tex, single fiber diameter of 13 to 16 μm, resistivity ≥ 1 × 10⁻⁶. 12 Ω·m, moisture content ≤0.10%, combustible content ≤0.5%, elastic modulus ≥90GPa.

8. The insulating boom according to any one of claims 3 to 5, wherein the atmospheric pressure plasma is an atmospheric pressure plasma formed from argon, carbon dioxide, oxygen, methane, acetylene, or air.

9. The insulating boom according to any one of claims 1 to 8, wherein the resin comprises epoxy resin and / or vinyl ester resin.

10. The insulating boom according to any one of claims 1 to 9, wherein the flexural strength of the resin is ≥140 MPa.

11. The insulating boom according to any one of claims 1 to 10, wherein the curing agent used for resin curing is an aromatic amine curing agent (such as diaminodiphenyl sulfone, diaminodiphenylmethane), an acid anhydride curing agent (such as methylnadic anhydride, methyltetrahydrophthalic anhydride, methylhexahydrophthalic anhydride), or a peroxide curing agent (such as isobutyl ketone peroxide, cyclohexanone oxide, methyl ethyl ketone peroxide, benzoyl peroxide, isocyanopropylbenzene peroxide), and the reaction promoter used for resin curing is cobalt naphthenate, cobalt isooctanoate, dimethylaniline, or diethylaniline. Preferably, the curing agent is isobutyl ketone peroxide, and the reaction promoter is cobalt isooctanoate.

12. The insulating boom of claim 11, wherein the weight ratio of the resin to the curing agent and the accelerator is 100:(0.8-4):(0.05-3), preferably 100:(1-3):(0.1-2.5), and more preferably 100:(1.25-3):(0.1-2.2).

13. The insulated boom according to any one of claims 1 to 12, wherein the angle between the basalt fiber and the central axis of the insulated boom is -5° to 5°, preferably -1° to 1°.

14. The insulating boom according to any one of claims 1 to 13, wherein the angle between the glass fiber and the central axis of the insulating boom is 85°-95°, preferably 88°-92°.

15. The insulating boom according to any one of claims 1 to 14, wherein the basalt fibers are distributed in the resin matrix parallel to the central axis of the insulating boom, and the glass fibers are uniformly distributed in the resin matrix perpendicular to the central axis of the insulating boom.

16. The insulating boom according to any one of claims 1-15, wherein the insulating boom further comprises a hydrophobic coating disposed on the outer surface of the insulating boom body.

17. The insulating boom according to any one of claims 1-16, wherein the outer surface of the hollow insulating boom body is subjected to frequent plasma treatment. Preferably, the atmospheric pressure plasma is an atmospheric pressure plasma formed from argon, carbon dioxide, oxygen, methane, acetylene, or air. Preferably, the outer surface of the hollow insulating arm is subjected to atmospheric pressure plasma treatment at a voltage of 20V to 40V for 10 to 15 minutes.

18. The insulating boom of claim 16, wherein the coating comprises an organosilicon material and nano-silica, preferably the nano-silica is hydrophobic nano-silica.

19. The insulating boom of claim 16 or 18, wherein the coating is formed by a paint; Preferably, the coating comprises an organosilicon coating, hydrophobic nano-silica, and acetone; Preferably, the weight ratio of the silicone coating to acetone is 1:0.8 to 1.2, for example, 1:1, and the amount of hydrophobic nano-silica added is 1% to 5% of the sum of the weights of the silicone coating and acetone. Preferably, the method for preparing the coating includes: 1) Mix the silicone coating with acetone until homogeneous; 2) Add hydrophobic nano-silica to the mixture obtained in 1) and mix thoroughly.

20. A method for preparing the insulating boom according to any one of claims 1-19, comprising: 1) Apply release agent to the surface of the core mold; 2) The resin-impregnated fiber bundles are laid and wound on the mandrel, wherein basalt fibers and glass fibers are laid. For every 1 to 6 layers (preferably 2 to 5 layers, 3 to 4 layers, for example 3, 4 or 5 layers) of basalt fibers, one layer of glass fiber is laid. The total thickness of the laying is 12 mm to 17 mm, for example about 14 mm, about 15 mm or about 16 mm. Preferably, the layup tension is controlled at 20% to 25% of the fiber strength; Preferably, the angle between the basalt fiber and the central axis of the mandrel is -1° to +1°, and the angle between the glass fiber and the central axis of the mandrel is 85° to 95°. 3) Use an external mold to compact the fiber matrix obtained in step 2) and remove excess resin; 4) Curing, the curing temperature is preferably 80-140℃, the curing time is preferably 2-4h, and the curing temperature is even more preferably 90-120℃, the curing time is preferably 2-3h, to obtain a hollow insulating arm; 5) Optionally, the outer surface of the hollow insulating arm is flattened.

21. The method of claim 20, wherein, The basalt fiber is a basalt fiber whose surface has been treated with atmospheric pressure plasma etching. Preferably, the surface of the basalt fiber is etched using atmospheric pressure plasma at a voltage of 20V to 60V for a processing time of 3s to 10s.

22. The method of claim 20 or 21, wherein the method further comprises: 6) Treat the outer surface of the hollow insulating arm with atmospheric pressure plasma; 7) Spray paint to form a coating on the outer surface of the hollow insulating arm.

23. The method of claim 22, wherein the coating comprises an organosilicon coating, hydrophobic nano-silica, and acetone; Preferably, the weight ratio of the silicone coating to acetone is 1:0.8 to 1.2, for example, 1:1, and the amount of hydrophobic nano-silica added is 1% to 5% of the sum of the weights of the silicone coating and acetone. Preferably, the preparation method includes: 1) Mix the silicone coating with acetone until homogeneous; 2) Add hydrophobic nano-silica to the mixture obtained in 1) and mix thoroughly.

24. An aerial work platform (e.g., an insulated boom lift) comprising the insulated boom as described in any one of claims 1-19.

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