WO2021128452A1 - 一种抗老化环氧树脂箱式变压器 - Google Patents

一种抗老化环氧树脂箱式变压器 Download PDF

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WO2021128452A1
WO2021128452A1 PCT/CN2020/070397 CN2020070397W WO2021128452A1 WO 2021128452 A1 WO2021128452 A1 WO 2021128452A1 CN 2020070397 W CN2020070397 W CN 2020070397W WO 2021128452 A1 WO2021128452 A1 WO 2021128452A1
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parts
epoxy resin
zinc oxide
aging
layer
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PCT/CN2020/070397
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French (fr)
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夏鹏
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江苏源通电气有限公司
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Publication of WO2021128452A1 publication Critical patent/WO2021128452A1/zh

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
    • C08L63/04—Epoxynovolacs
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/02—Casings

Definitions

  • the invention relates to the technical field of transformers, in particular to an anti-aging epoxy resin box-type transformer.
  • Transformers are necessary electrical equipment for power transmission and distribution.
  • paint is generally sprayed on the surface of the transformer box to form a coating layer to prevent corrosion of the surface of the transformer box, and at the same time. Anti-insulation effect.
  • Most electrical equipment is installed outdoors. Although the paint layer contains a lot of organic matter, the paint layer will age under natural conditions, so the role of the paint layer will drop linearly, which will lead to the housing of the electrical equipment. Corrosion and aging will occur, and it will also make it difficult to guarantee the safety of electrical equipment. And when there are multiple electrical equipment in the surrounding environment, it will cause strong electromagnetic interference to the electrical equipment and affect the working efficiency of the transformer. Therefore, it is meaningful to study a transformer that can resist aging and electromagnetic shielding.
  • the present invention provides an anti-aging epoxy resin box transformer.
  • An anti-aging epoxy resin box-type transformer comprising a box body, a transformer shell and a transformer main body arranged in the box body, the box body and the transformer shell are both made of metal plates, and the metal plates are from An anti-aging coating layer, an electromagnetic shielding layer, and a topcoat layer are sequentially arranged inside and outside.
  • the coating layer includes the following components by weight: 10-20 parts of butanol, 40-60 parts of zinc oxide-phenolic epoxy resin Parts, 20-30 parts of micro glass flakes, 20-30 parts of modified zinc oxide, 10-25 parts of polytetrafluoroethylene, 8-15 parts of polyurethane resin, 3-5 parts of polyvinyl acetate and other additives 1-5 Copies.
  • the modification method of the modified zinc oxide is:
  • step (2) Dissolve zinc oxide in ethanol, then add it to the hydrolyzed solution obtained in step (1), react at 70-90°C for 1-3 hours, and then dry and grind the reaction solution to obtain modified zinc oxide. .
  • the zinc oxide-phenolic epoxy resin is prepared from the following components in parts by weight: 30-60 parts of phenolic epoxy resin, 20-40 parts of modified zinc oxide, and curing agent 10-20 servings.
  • the preparation method of the zinc oxide-phenolic epoxy resin is:
  • step (2) Dissolve zinc oxide in ethanol, then add it to the hydrolyzed solution obtained in step (1), react at 70-90°C for 1-3 hours, and then dry and grind the reaction solution to obtain modified zinc oxide. ;
  • the auxiliary agent is one or more of a dispersant, a curing agent, and a solvent.
  • the preparation method of the coating of the coating layer is as follows:
  • the paint layer is sprayed on the surface of the cabinet and the transformer shell by using a vacuum pressure spraying equipment.
  • the thickness of the electromagnetic shielding layer is greater than or equal to 300 ⁇ m.
  • the electromagnetic shielding layer adopts a magnetron sputtering coating method to form a silicon nitride layer on the surface of the box body and the transformer shell.
  • the power of the silicon target power supply is 25-30Kw
  • the atomizing gas flow rate is 100-200sccm
  • the coating temperature is 150-200°C
  • the coating time is 10-15min
  • the bias voltage applied to the surface of the box and transformer shell is -(150- 200)V.
  • the thickness of the topcoat layer is greater than or equal to 200 micrometers, and the topcoat layer is a polytetrafluoroethylene paint, which is cured at high temperature to form the topcoat layer.
  • an anti-aging paint layer, an electromagnetic shielding layer and a topcoat layer are applied on the basis of the metal sheet, and the three-layer protection improves the anti-aging ability and electromagnetic shielding performance of the transformer;
  • the salt-alkali corrosion-resistant paint of this application is modified by epoxy resin to obtain zinc oxide-phenolic epoxy resin, and micro glass sheets are introduced to prevent rainwater, salt, etc. from entering, and modified zinc oxide is introduced to improve corrosion resistance. It can also inhibit the deterioration of the coating caused by ultraviolet rays, improve the weather resistance, aging resistance, and corrosion resistance of the coating, so that the transformer has a longer service life;
  • Polytetrafluoroethylene has good chemical stability, corrosion resistance, airtightness, electrical insulation and good aging resistance, which can effectively reduce the external environment of the surface transformer. The probability of being corroded when immersed in rain, so that the paint on the surface of the transformer shell can be used for a longer time;
  • the silicon nitride electromagnetic shielding layer is added to reduce the electromagnetic interference to the transformer.
  • An anti-aging epoxy resin box-type transformer comprising a box body, a transformer shell and a transformer main body arranged in the box body, the box body and the transformer shell are both made of metal plates, and the metal plates are from An anti-aging coating layer, an electromagnetic shielding layer, and a topcoat layer are sequentially arranged inside and outside.
  • the coating layer includes the following components by weight: 10-20 parts of butanol, 40-60 parts of zinc oxide-phenolic epoxy resin Parts, 20-30 parts of micro glass flakes, 20-30 parts of modified zinc oxide, 10-25 parts of polytetrafluoroethylene, 8-15 parts of polyurethane resin, 3-5 parts of polyvinyl acetate and other additives 1-5 Copies.
  • the modification method of the modified zinc oxide is:
  • step (2) Dissolve zinc oxide in ethanol, then add it to the hydrolyzed solution obtained in step (1), react at 70-90°C for 1-3 hours, and then dry and grind the reaction solution to obtain modified zinc oxide. .
  • the zinc oxide-phenolic epoxy resin is prepared from the following components in parts by weight: 30-60 parts of phenolic epoxy resin, 20-40 parts of modified zinc oxide, and 10-20 parts of curing agent. Copies.
  • the preparation method of the zinc oxide-phenolic epoxy resin is:
  • step (2) Dissolve zinc oxide in ethanol, then add it to the hydrolyzed solution obtained in step (1), react at 70-90°C for 1-3 hours, and then dry and grind the reaction solution to obtain modified zinc oxide. ;
  • the auxiliary agent is one or more of a dispersant, a curing agent, and a solvent.
  • the preparation method of the paint of the paint layer is as follows:
  • the paint layer is sprayed on the surface of the box body and the transformer shell by using a vacuum pressure spraying equipment.
  • the thickness of the electromagnetic shielding layer is greater than or equal to 300 ⁇ m.
  • the electromagnetic shielding layer adopts a magnetron sputtering coating method, and a silicon nitride layer is formed on the surface of the box body and the transformer shell.
  • the silicon nitride target is used as the target material and the silicon nitride target power supply is set.
  • the power is 25-30Kw
  • the atomizing gas flow is 100-200sccm
  • the coating temperature is 150-200°C
  • the coating time is 10-15min
  • the bias voltage applied to the surface of the box and transformer shell is -(150-200)V .
  • the thickness of the topcoat layer is greater than or equal to 200 microns, and the topcoat layer is a polytetrafluoroethylene paint, which is cured at high temperature to form the topcoat layer.
  • an anti-aging coating layer, an electromagnetic shielding layer and a topcoat layer are applied on the basis of a metal sheet, and the three-layer protection improves the anti-aging ability and electromagnetic shielding performance of the transformer; the oxidation is obtained by modifying the epoxy resin Zinc-phenolic epoxy resin, and the introduction of micro glass sheets to prevent rain, salt, etc.
  • modified zinc oxide to improve corrosion resistance can also inhibit the deterioration of the coating caused by ultraviolet rays, and improve the weather resistance, aging resistance, and resistance of the coating Corrosion, making the transformer have a longer service life; adding polytetrafluoroethylene to the coating, polytetrafluoroethylene has good chemical stability, corrosion resistance, sealing, electrical insulation and good aging resistance, can Effectively reduce the probability that the surface transformer will be corroded when it is immersed in rainwater in the external environment, so that the paint on the surface of the transformer shell can be used for a longer time; an electromagnetic shielding layer of silicon nitride is added to reduce electromagnetic interference to the transformer.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Power Engineering (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Paints Or Removers (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

一种抗老化环氧树脂箱式变压器，包括箱体，和设置在其内的变压器壳体，箱体和变压器壳体均由金属板材制作而成，从内向外依次设有抗老化的涂料层、电磁屏蔽层和面漆层，涂料层包括丁醇10-20份、氧化锌-酚醛环氧树脂40-60份、微型玻璃片20-30份、改性氧化锌20-30份、聚四氟乙烯10-25份、聚氨酯树脂8-15份、聚醋酸乙烯酯3-5份及其他助剂1-5份。在金属板材的基础上涂覆抗老化的涂料层、电磁屏蔽层和面漆层，三层防护，通过对环氧树脂进行改性得到氧化锌-酚醛环氧树脂，并引入微型玻璃片防止雨水、盐分等进入，引入改性氧化锌、聚四氟乙烯提高耐腐蚀性能还可以抑制由紫外线引起的涂料劣化，提高了变压器的抗老化性、耐腐蚀性。

Description

一种抗老化环氧树脂箱式变压器 技术领域
本发明涉及变压器技术领域，尤其涉及一种抗老化环氧树脂箱式变压器。
背景技术
变压器是输配电中必须的电气设备，为了保护变压器的外壳，现有技术中一般会在变压器的箱体表面喷涂料以形成涂料层进而起到防止变压器的箱体表面的腐蚀，同时起到抗绝缘的作用。大部分的电气设备安装于室外，虽然涂料层中含有大量的有机物，然而在自然条件下涂料层会出现老化的情况，那么涂料层所要起到的作用便会直线下降，进而导致电气设备的外壳会出现腐蚀老化的情况，同时也使得电气设备的安全性难以得到保障。且周边环境有多个电气设备时会对电气设备造成较强的电磁干扰，影响变压器的工作效率。所以研究一种既可以抗老化又可以进行电磁屏蔽的变压器很有意义。
发明内容
为克服现有技术中存在的变压器抗老化性能不佳的问题，本发明提供了一种抗老化环氧树脂箱式变压器。
一种抗老化环氧树脂箱式变压器，包括箱体，和设置在其内的变压器壳体、变压器主体，所述箱体和变压器壳体均由金属板材制作而成，所述金属板材上从内向外依次设有抗老化的涂料层、电磁屏蔽层和面漆层，所述涂料层的包括如下重量份的各组分：丁醇10-20份、氧化锌-酚醛环氧树脂40-60份、微型玻璃片20-30份、改性氧化锌20-30份、聚四氟乙烯10-25份、聚氨酯树脂8-15份、聚醋酸乙烯酯3-5份及其他助剂1-5份。
在本发明一优选实施例中，所述改性氧化锌的改性方法为：
(1)将偶联剂溶于体积比为1-8的乙醇和水的混合液中，搅拌均匀后于50-70℃下水解0.5-2h；
(2)将氧化锌溶于乙醇中，然后加入到步骤(1)得到的水解液中，于70-90℃ 下反应1-3h，反应液经抽滤后进行干燥和研磨得到改性氧化锌。
在本发明一优选实施例中，所述氧化锌-酚醛环氧树脂由如下重量份的各组分制备而成：酚醛环氧树脂30-60份、改性氧化锌20-40份和固化剂10-20份。
在本发明一优选实施例中，所述氧化锌-酚醛环氧树脂的制备方法为：
(1)将偶联剂溶于体积比为1-8的乙醇和水的混合液中，搅拌均匀后于50-70℃下水解0.5-2h；
(2)将氧化锌溶于乙醇中，然后加入到步骤(1)得到的水解液中，于70-90℃下反应1-3h，反应液经抽滤后进行干燥和研磨得到改性氧化锌；
(3)将酚醛环氧树脂、改性氧化铝和固化剂混合浇注，浇注温度保持在200℃，得到氧化铝-酚醛环氧树脂复合材料。
在本发明一优选实施例中，所述助剂为分散剂、固化剂、溶剂中的一种或多种。
在本发明一优选实施例中，，所述涂料层的涂料的制备方法如下：
(1)按重量份计，将丁醇10-20份、氧化锌-酚醛环氧树脂40-60份、聚四氟乙烯10-25份、聚氨酯树脂8-15份、聚醋酸乙烯酯3-5份及其他助剂1-5份在混合机中混合均匀，调节混合物组分的pH值为6；
(3)在氮气或者氦气氛围下，向混合组分中慢慢添加微型玻璃片20-30份、改性氧化锌20-30份的混合物，搅拌混合均匀后研磨使细度至20μm以下，即得涂料。
在本发明一优选实施例中，所述涂料层是利用真空加压喷涂设备将涂料喷涂于箱体和变压器壳体表面。
在本发明一优选实施例中，所述电磁屏蔽层的厚度大于等于300μm。
在本发明一优选实施例中，所述电磁屏蔽层是采用磁控溅射镀膜法，在箱体和变压器壳体表面上形成氮化硅层，以氮化硅靶为靶材，设置氮化硅靶电源功率为25-30Kw，雾化气体流量为100-200sccm，镀膜温度为150-200℃，镀膜时间为10-15min，施加于箱体和变压器壳体表面的偏压为-(150-200)V。
在本发明一优选实施例中，所述面漆层的厚度大于等于200微米，所述面漆层为聚四氟乙烯涂料，高温固化形成面漆层。
与现有技术相比，本发明的有益效果是：
(1)本申请在金属板材的基础上涂覆抗老化的涂料层、电磁屏蔽层和面漆层，三层防护，提高了变压器的抗老化能力和电磁屏蔽性能；
(2)本申请耐盐碱腐蚀的涂料是通过对环氧树脂进行改性得到氧化锌-酚醛环氧树脂，并引入微型玻璃片防止雨水、盐分等进入，引入改性氧化锌提高耐腐蚀性能还可以抑制由紫外线引起的涂料劣化，提高了涂料的耐候性、抗老化性、耐腐蚀性，使得变压器具备更长的使用寿命；
(3)本申请在涂料中添加聚四氟乙烯，聚四氟乙烯具有良好的化学稳定性、耐腐蚀性、密封性、电绝缘性以及良好的抗老化性，能够有效降低表面变压器在外界环境中遭到雨水浸泡时被腐蚀的几率，使得变压器壳体表面的漆能够被使用更长的时间；
(4)增加了氮化硅电磁屏蔽层，降低电磁对变压器的干扰。
具体实施方式
以下结合附图和实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本发明，并不用于限定本发明。
一种抗老化环氧树脂箱式变压器，包括箱体，和设置在其内的变压器壳体、变压器主体，所述箱体和变压器壳体均由金属板材制作而成，所述金属板材上从内向外依次设有抗老化的涂料层、电磁屏蔽层和面漆层，所述涂料层的包括如下重量份的各组分：丁醇10-20份、氧化锌-酚醛环氧树脂40-60份、微型玻璃片20-30份、改性氧化锌20-30份、聚四氟乙烯10-25份、聚氨酯树脂8-15份、聚醋酸乙烯酯3-5份及其他助剂1-5份。
在本实施例中，所述改性氧化锌的改性方法为：
(1)将偶联剂溶于体积比为1-8的乙醇和水的混合液中，搅拌均匀后于50-70℃下水解0.5-2h；
(2)将氧化锌溶于乙醇中，然后加入到步骤(1)得到的水解液中，于70-90℃下反应1-3h，反应液经抽滤后进行干燥和研磨得到改性氧化锌。
在本实施例中，所述氧化锌-酚醛环氧树脂由如下重量份的各组分制备而成：酚醛环氧树脂30-60份、改性氧化锌20-40份和固化剂10-20份。
在本实施例中，所述氧化锌-酚醛环氧树脂的制备方法为：
(1)将偶联剂溶于体积比为1-8的乙醇和水的混合液中，搅拌均匀后于50-70℃下水解0.5-2h；
(2)将氧化锌溶于乙醇中，然后加入到步骤(1)得到的水解液中，于70-90℃下反应1-3h，反应液经抽滤后进行干燥和研磨得到改性氧化锌；
(3)将酚醛环氧树脂、改性氧化铝和固化剂混合浇注，浇注温度保持在200℃，得到氧化铝-酚醛环氧树脂复合材料。
在本实施例中，所述助剂为分散剂、固化剂、溶剂中的一种或多种。
在本实施例中，所述涂料层的涂料的制备方法如下：
(1)按重量份计，将丁醇10-20份、氧化锌-酚醛环氧树脂40-60份、聚四氟乙烯10-25份、聚氨酯树脂8-15份、聚醋酸乙烯酯3-5份及其他助剂1-5份在混合机中混合均匀，调节混合物组分的pH值为6；
(3)在氮气或者氦气氛围下，向混合组分中慢慢添加微型玻璃片20-30份、改性氧化锌20-30份的混合物，搅拌混合均匀后研磨使细度至20μm以下，即得涂料。
在本实施例中，所述涂料层是利用真空加压喷涂设备将涂料喷涂于箱体和变压器壳体表面。
在本实施例中，所述电磁屏蔽层的厚度大于等于300μm。
在本实施例中，所述电磁屏蔽层是采用磁控溅射镀膜法，在箱体和变压器壳体表面上形成氮化硅层，以氮化硅靶为靶材，设置氮化硅靶电源功率为25-30Kw，雾化气体流量为100-200sccm，镀膜温度为150-200℃，镀膜时间为10-15min，施加于箱体和变压器壳体表面的偏压为-(150-200)V。
在本实施例中，所述面漆层的厚度大于等于200微米，所述面漆层为聚四氟乙烯涂料，高温固化形成面漆层。
本申请在金属板材的基础上涂覆抗老化的涂料层、电磁屏蔽层和面漆层，三层防护，提高了变压器的抗老化能力和电磁屏蔽性能；通过对环氧树脂进行改性得到氧化锌-酚醛环氧树脂，并引入微型玻璃片防止雨水、盐分等进入，引入改性氧化锌提高耐腐蚀性能还可以抑制由紫外线引起的涂料劣化，提高了涂料的耐 候性、抗老化性、耐腐蚀性，使得变压器具备更长的使用寿命；在涂料中添加聚四氟乙烯，聚四氟乙烯具有良好的化学稳定性、耐腐蚀性、密封性、电绝缘性以及良好的抗老化性，能够有效降低表面变压器在外界环境中遭到雨水浸泡时被腐蚀的几率，使得变压器壳体表面的漆能够被使用更长的时间；增加了氮化硅电磁屏蔽层，降低电磁对变压器的干扰。
上述说明示出并描述了本发明的优选实施例，如前所述，应当理解本发明并非局限于本文所披露的形式，不应看作是对其他实施例的排除，而可用于各种其他组合、修改和环境，并能够在本文所述发明构想范围内，通过上述教导或相关领域的技术或知识进行改动。而本领域人员所进行的改动和变化不脱离本发明的精神和范围，则都应在本发明所附权利要求的保护范围内。

Claims (10)

  1. 一种抗老化环氧树脂箱式变压器，其特征在于，包括箱体，和设置在其内的变压器壳体、变压器主体，所述箱体和变压器壳体均由金属板材制作而成，所述金属板材上从内向外依次设有抗老化的涂料层、电磁屏蔽层和面漆层，所述涂料层的包括如下重量份的各组分：丁醇10-20份、氧化锌-酚醛环氧树脂40-60份、微型玻璃片20-30份、改性氧化锌20-30份、聚四氟乙烯10-25份、聚氨酯树脂8-15份、聚醋酸乙烯酯3-5份及其他助剂1-5份。
  2. 根据权利要求1所述的一种抗老化环氧树脂箱式变压器，其特征在于，所述改性氧化锌的改性方法为：
    (1)将偶联剂溶于体积比为1-8的乙醇和水的混合液中，搅拌均匀后于50-70℃下水解0.5-2h；
    (2)将氧化锌溶于乙醇中，然后加入到步骤(1)得到的水解液中，于70-90℃下反应1-3h，反应液经抽滤后进行干燥和研磨得到改性氧化锌。
  3. 根据权利要求1所述的一种抗老化环氧树脂箱式变压器，其特征在于：所述氧化锌-酚醛环氧树脂由如下重量份的各组分制备而成：酚醛环氧树脂30-60份、改性氧化锌20-40份和固化剂10-20份。
  4. 根据权利要求1所述的一种抗老化环氧树脂箱式变压器，其特征在于，所述氧化锌-酚醛环氧树脂的制备方法为：
    (1)将偶联剂溶于体积比为1-8的乙醇和水的混合液中，搅拌均匀后于50-70℃下水解0.5-2h；
    (2)将氧化锌溶于乙醇中，然后加入到步骤(1)得到的水解液中，于70-90℃下反应1-3h，反应液经抽滤后进行干燥和研磨得到改性氧化锌；
    (3)将酚醛环氧树脂、改性氧化铝和固化剂混合浇注，浇注温度保持在200℃，得到氧化铝-酚醛环氧树脂复合材料。
  5. 根据权利要求1所述的一种抗老化环氧树脂箱式变压器，其特征在于：所述助剂为分散剂、固化剂、溶剂中的一种或多种。
  6. 根据权利要求1所述的一种抗老化环氧树脂箱式变压器，其特征在于，所述涂料层的涂料的制备方法如下：
    (1)按重量份计，将丁醇10-20份、氧化锌-酚醛环氧树脂40-60份、聚四氟乙 烯10-25份、聚氨酯树脂8-15份、聚醋酸乙烯酯3-5份及其他助剂1-5份在混合机中混合均匀，调节混合物组分的pH值为6；
    (3)在氮气或者氦气氛围下，向混合组分中慢慢添加微型玻璃片20-30份、改性氧化锌20-30份的混合物，搅拌混合均匀后研磨使细度至20μm以下，即得涂料。
  7. 根据权利要求1所述的一种抗老化环氧树脂箱式变压器，其特征在于：所述涂料层是利用真空加压喷涂设备将涂料喷涂于箱体和变压器壳体表面。
  8. 根据权利要求1所述的一种抗老化环氧树脂箱式变压器，其特征在于：所述电磁屏蔽层的厚度大于等于300μm。
  9. 根据权利要求1所述的一种抗老化环氧树脂箱式变压器，其特征在于：所述电磁屏蔽层是采用磁控溅射镀膜法，在箱体和变压器壳体表面上形成氮化硅层，以氮化硅靶为靶材，设置氮化硅靶电源功率为25-30Kw，雾化气体流量为100-200sccm，镀膜温度为150-200℃，镀膜时间为10-15min，施加于箱体和变压器壳体表面的偏压为-(150-200)V。
  10. 根据权利要求1所述的一种抗老化环氧树脂箱式变压器，其特征在于：所述面漆层的厚度大于等于200微米，所述面漆层为聚四氟乙烯涂料，高温固化形成面漆层。
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