WO2013056496A1 - 电工钢表面极厚绝缘涂层的生产方法 - Google Patents

电工钢表面极厚绝缘涂层的生产方法 Download PDF

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Publication number
WO2013056496A1
WO2013056496A1 PCT/CN2011/083914 CN2011083914W WO2013056496A1 WO 2013056496 A1 WO2013056496 A1 WO 2013056496A1 CN 2011083914 W CN2011083914 W CN 2011083914W WO 2013056496 A1 WO2013056496 A1 WO 2013056496A1
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Prior art keywords
coating
baking
strip
film
film thickness
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PCT/CN2011/083914
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English (en)
French (fr)
Inventor
陆永强
吕春国
王志成
陈彬
陈晓
谢世殊
Original Assignee
宝山钢铁股份有限公司
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=48054960&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2013056496(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by 宝山钢铁股份有限公司 filed Critical 宝山钢铁股份有限公司
Priority to KR1020147008835A priority Critical patent/KR101602748B1/ko
Priority to JP2014536090A priority patent/JP5778351B2/ja
Priority to MX2014004640A priority patent/MX344463B/es
Priority to EP11874169.3A priority patent/EP2769775B1/en
Priority to RU2014119944/05A priority patent/RU2568727C1/ru
Priority to US14/348,357 priority patent/US9406416B2/en
Publication of WO2013056496A1 publication Critical patent/WO2013056496A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/12—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain a coating with specific electrical properties
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06—Insulating conductors or cables
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/04—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material to opposite sides of the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • 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
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08—Anti-corrosive paints
    • 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
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08—Anti-corrosive paints
    • C09D5/082—Anti-corrosive paints characterised by the anti-corrosive pigment
    • C09D5/084—Inorganic compounds
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/0016—Apparatus or processes specially adapted for manufacturing conductors or cables for heat treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2202/00—Metallic substrate
    • B05D2202/10—Metallic substrate based on Fe
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2252/00—Sheets
    • B05D2252/10—Applying the material on both sides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment
    • B05D3/0272—After-treatment with ovens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
    • B05D3/0413—Heating with air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/16—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets
    • H01F1/18—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets with insulating coating

Definitions

  • the present invention relates to a coating and film forming technique for a strip surface coating, and more particularly to a method for producing an extremely thick insulating coating on an electrical steel surface. Background technique
  • the extremely thick insulating coating on the surface of electrical steel mainly uses coatings produced by companies such as Dupont, Rembrandtin and Kluthe.
  • the coating process generally adopts two upper and two roller coating machines.
  • the coating roller adopts a grooved roller, and the coating roller is a passive roller.
  • the speed of the strip is mainly driven by the speed of the strip. Once the speed of the unit fluctuates, it will be
  • the film thickness control has an adverse effect, so the coating method has low precision on the thickness control of the coating layer, and the coating produced by the grooved roller is prone to defects of uneven coating, resulting in uneven insulation performance, and does not satisfy the stack.
  • the requirements of the film are examples of the coatings produced by companies such as Dupont, Rembrandtin and Kluthe.
  • the post-coating baking methods mainly include induction heating technology, hot air drying technology, infrared heating technology and near-infrared heating technology.
  • the induction heating technology equipment is difficult to install, and the heating is uneven along the width direction of the strip, which is likely to cause uneven coating performance.
  • Infrared and near-infrared heating devices although high in heating accuracy, have large equipment investment and complicated processes, which are not conducive to reducing production costs. Summary of invention
  • the object of the present invention is to provide a method for producing an extremely thick insulating coating on an electrical steel surface, which has an extremely thick insulating coating on the surface of an electrical steel, and has a coating film thickness of 2 to 10 ⁇ m, uniform film thickness, and excellent interlayer. Resistance performance, suitable for large hydropower and nuclear power.
  • a method for producing an extremely thick insulating coating on an electrical steel surface comprising the following steps:
  • the coating solution thoroughly for a period of 0.1 to 4 hours, then add water to the coating solution or The solvent is diluted to ensure a viscosity of 10 80 s (measured with a DIN 4 cup). Due to the high solid content of the extremely thick coating and the high viscosity (generally over 100S), in order to ensure the uniformity of the coating liquid, the coating liquid is fully stirred by a pneumatic adjustable agitator (rotation speed of about 100 1000 rpm). 0.1 to 4 hours, then dilute the coating solution and use a viscometer for testing.
  • the viscosity of the coating liquid is low, the coating speed is fast, and the surface quality is not easy to be generated.
  • the viscosity is not conducive to the leveling property of the coating liquid, and it is easy to cause streaks and leakage coating defects. Therefore, it is necessary to select a reasonable coating liquid viscosity, and the viscosity range of the present invention is within 10 80 S.
  • the coating liquid should not be large. Bubbles are generated.
  • the extremely thick coating liquid of the invention mainly adopts products of companies such as Dupont, Rembrandtin and Kluthe, and is mainly a mixture of inorganic components and organic components, but the solid components of different company products are different, mainly by BaS0 4 , Several compositions of CaS0 4 , CaC0 3 , Ti0 2 , NN-dimethylethanolamine, 2-butoxyethanol, 1-butoxy-2-propanol, carbon black, polyisobutylene and n-butanol.
  • the content of BaS0 4 , CaS0 4 and CaC0 3 is generally 30-70%, and the content of Ti0 2 is generally 5-15%, NN-dimethylethanolamine, 2-butoxyethanol and 1-butoxy-
  • the 2-propanol content is generally between 1 and 5%, and the remaining organic components are generally between 0.1 and 1%.
  • Coating with a two-roll or three-roll coater is used to determine the method by which the film thickness can be adjusted, such as adjusting the peripheral speed ratio, pressure, and clearance of the rolls to achieve uniform control and precision of the film thickness.
  • the coating machine coating roller and the liquid take-up roller generally have a peripheral speed ratio of 0.2 to 1.2, and the coating roller and the liquid take-up roller have a pressure of 0.1 to 10 KPa, and the gap between the liquid take-up roller and the metering roller is
  • the pressure between the coating roll and the take-up roll can be adjusted in time for coating thickness and coating uniformity.
  • the liquid roll and the coating roll have a peripheral speed ratio of 0.2-1.5, and the pressure between the rolls is l-50KPa.
  • Coating baking adopts a method of heating the burner, and the heated air is circulated through the circulating bellows arranged up and down, and the wet film on the surface of the steel strip is dried and solidified into a film, and the water in the coating liquid evaporates and then passes through the exhaust fan to the atmosphere.
  • the coating is baked to form a film by a three-stage heating and cooling method.
  • the three sections are mainly the drying section, the baking section and the cooling section, wherein the drying section temperature is 100-400 °C, and the baking section temperature is 200-370 °C.
  • the whole drying and solidifying film forming stage has a time of 33-144S, wherein the wet film drying time is 9 ⁇ 39S, the baking time is 24105S, and finally a coating of 2 ⁇ 10 ⁇ film thickness is formed;
  • the drying section and the torrefaction section after the entire coating of the present invention are produced by a conveyor which is not in contact with the strip, and which is capable of blowing air of a variable pressure for floating the strip with a wet film.
  • the strip coated with the wet film utilizes the floating action of the conveying device in the baking oven, and does not contact the furnace roll before the wet film is solidified, thereby ensuring complete film formation on the wet film surface.
  • the gas pressure is between 0 and 2000 Pa.
  • the method of the present invention further comprises the step 4) detecting the film thickness on the line, and the invention adopts the conventional on-line film thickness detecting method to continuously detect the film thicknesses of the upper and lower surfaces, and has the film thickness feedback function.
  • the parameters of the coating machine are adjusted in time to achieve the target film thickness, and the film thickness stability is ensured.
  • the thick coating of the surface of the electrical steel prepared by the production process of the invention has uniform film thickness, good adhesion, strong scratch resistance, excellent electrical insulation, and can be used for electrical steel coating for large hydropower and nuclear power.
  • Precise control of the film thickness can be achieved by coating with a two-roll or three-roll coater to determine the control and adjustment of the coating thickness.
  • the coating is formed by the method of open flame heating and hot air circulation, and the heating section at different temperatures is set to obtain a good coating.
  • the curing film formation time is 33 ⁇ 144 seconds, thus ensuring excellent coating. Adhesion and insulation.
  • the strip is conveyed using a non-contact strip conveyor to ensure the integrity of the coating.
  • the invention can realize continuous production for coating products larger than 2 ⁇ , thereby ensuring different factories
  • FIG. 1 is a schematic view of an embodiment of the present invention.
  • FIG. 2 is a schematic view of another embodiment of the present invention. Detailed description of the invention
  • the rolled and annealed electrical steel strip 1 is coated on the upper and lower surfaces of the strip 1 by a liquid take-up roll 2 and a coating roll 3, and the viscosity of the coating liquid is 27S, which is coated by a three-roller.
  • the layer roll has a peripheral speed ratio of 0.45
  • the liquid take-up roll 2 has a peripheral speed ratio of 0.41
  • the take-up roll 2 and the metering roll 4 have a gap of ⁇ , and then is formed into a film in the baking oven 5, and the coating is performed by a three-stage heating and cooling method.
  • the baking film is formed into a drying section 51, a baking section 52 and a cooling section 53, a drying temperature of 350 ° C, a baking temperature of 320 ° C, and a curing film forming time of 35 seconds.
  • a uniform thick coating having an upper surface film thickness of 5 ⁇ m, a coating adhesion of GT0, an interlayer resistance of 900 ⁇ 1 ⁇ 2 ⁇ (European standard), and an excellent surface quality was obtained. If the surface quality of the coating is out of the parameter optimization range, there is a problem that the powder is dropped, the adhesion is poor, and the surface of the coating is uneven.
  • the rolled and annealed electrical steel strip 1 is coated on the upper and lower surfaces of the strip 1 by a liquid take-up roll 2 and a coating roll 3, and the viscosity of the coating liquid is 30 s.
  • the coating roll has a peripheral speed ratio of 0.48
  • the liquid take-up roll 2 has a peripheral speed ratio of 0.40.
  • the coating roll and the take-up roll pressure are then formed in the baking furnace 5, using three-stage heating and
  • the cooling method comprises baking the coating into a film, specifically a drying section 51, a baking section 52 and a cooling section 53, a drying temperature of 100 ° C, a baking temperature of 220 ° C, and a curing film forming time of 72 s.
  • the invention can be applied to the production of electrical steel surface coatings for large hydropower, nuclear power generators and other motors with high insulation requirements.

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  • Wood Science & Technology (AREA)
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  • Manufacturing & Machinery (AREA)
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Abstract

电工钢表面极厚绝缘涂层的生产方法，包括如下歩骤：1）涂液配制，将涂液进行充分搅拌，搅拌时间0.1~4小时，涂液粘度在10-80S内；2）带钢涂覆，采用二辊或三辊式涂层机，通过调整不同的参数从而可以控制膜厚和均匀性；3）涂层烘烤，采用三段式加热对涂层进行烘烤成膜，三段为干燥段、烘烤段和冷却段，干燥段温度在100~400°C，烘烤段温度在200-370°C；整个干燥段和烘烤段时间为33~144秒，其中湿膜干燥时间为9~39秒，烘烤时间为24~105秒；涂覆后的带钢及在涂层烘烤阶段，带钢传送是采用与带钢不接触的传送方法进行，具体为通过对带钢下表面吹出可调压力的空气，使带钢漂浮传送，气体压力在0~2000Pa；湿膜固化前不与加热炉辊接触，保证湿膜表面完整成膜；4）在线膜厚检测。

Description

电工钢表面极厚绝缘涂层的生产方法 发明领域
本发明涉及带钢表面涂层的涂覆及成膜技术，特别涉及电工钢表面极 厚绝缘涂层的生产方法。 背景技术
目前， 随着国内工业的迅速发展， 对电力需求日益上升， 随着环保呼 声愈来愈高， 国家对核电、 水电和太阳能电的投资逐歩增大， 大型水电、 核电发电机等对电工钢的要求越来越高， 对绝缘性要求更加严格。 因此， 需开发一种在带钢表面涂覆极厚环保绝缘涂层的工艺技术。
目前， 电工钢表面极厚绝缘涂层主要采用 Dupont、 Rembrandtin 和 Kluthe等公司生产的涂料。涂料涂敷过程一般采用上下两辊式涂层机， 涂 层辊采用刻槽辊， 且涂层辊是被动辊， 主要靠带钢的速度带动涂层辊的转 动， 一旦机组速度波动， 将对膜厚控制带来不利影响， 故该种涂敷方式对 涂层厚度控制精度不高， 且刻槽辊生产的涂层容易产生涂层不均的缺陷， 导致绝缘性能不均匀， 且不满足叠片的要求。涂覆后烘烤方式主要有感应 加热技术、 热风干燥技术、 红外加热技术以及近红外加热技术， 其中感应 加热技术设备安装困难， 沿带钢宽度方向上加热不均匀， 容易造成涂层性 能不均； 而红外和近红外加热装置， 虽然加热精度高， 但设备投资大， 工 艺复杂， 不利于降低生产成本。 发明概述
本发明的目的在于提供一种电工钢表面极厚绝缘涂层的生产方法，电 工钢表面具有优异性能的极厚绝缘涂层， 涂层膜厚在 2~10μπι， 膜厚均匀， 具有优异层间电阻性能， 适用于大型水电、 核电用。
为达到上述目的， 本发明采用如下的技术解决方案：
电工钢表面极厚绝缘涂层的生产方法， 其包括如下歩骤：
1 ) 涂液配制：
将涂液进行充分搅拌， 搅拌时间 0.1~4小时， 然后对涂液进行加水或 溶剂进行稀释， 保证粘度在 10 80S内 （采用 DIN4杯测量） 。 由于极厚涂层中固含量较高， 粘度大 （一般超过 100S ) ， 为保证涂 液的均匀性， 先将涂液用气动可调搅拌器 （转速约 100 1000转 /分钟） 进 行充分搅拌约 0.1~4小时，然后对涂液进行稀释，并采用粘度计进行检测。
为保证带钢良好的涂层涂覆与带钢速度匹配，保证涂液的流平性及涂 层均匀性， 涂液粘度低容易造成涂覆速度快， 容易产生气泡对表面质量不 禾 U , 粘度大不利于涂液的流平性， 容易产生条纹和漏涂缺陷， 因此， 需要 选择合理的涂液粘度， 本发明粘度范围在 10 80S内， 另， 搅拌过程中注 意涂液中不要有大量气泡产生。
本发明极厚涂层涂液主要采用 Dupont、 Rembrandtin和 Kluthe等公司 的产品， 主要为无机组分和有机组分的混合体， 但不同公司产品所含的固 体组分不同， 主要由 BaS04、 CaS04、 CaC03、 Ti02、 N-N-二甲基乙醇胺、 2-丁氧基乙醇、 1-丁氧基 -2-丙醇、 炭黑、 聚异丁烯和正丁醇等中的几种组 成。
其中 BaS04、 CaS04和 CaC03含量一般分别在 30-70%， Ti02的含量 一般分别在 5-15%， N-N-二甲基乙醇胺、 2-丁氧基乙醇和 1-丁氧基 -2-丙醇 含量一般分别在 1-5%， 其余有机组分含量一般在 0.1-1%之间。
由于具体涂液为外购的现有产品， 在此不再赘述。
2) 带钢涂覆：
采用两辊式或三辊式涂层机进行涂覆， 以此确定可以调节膜厚的方 法， 如调整辊子的周速比、 压力、 间隙等参数， 实现对膜厚的均匀控制与 精度。
如采用三辊式涂层机， 通过设定涂层机中三辊的周速比， 涂层辊与取 液辊之间的压力，取液辊与计量辊之间的间隙便可以对涂层厚度和涂层均 匀性进行适时调节。优化的，涂层机涂层辊和取液辊周速比一般为 0.2~1.2 之间， 涂层辊与取液辊压力为 0.1~10KPa 之间， 取液辊与计量辊间隙为
Figure imgf000004_0001
如采用二辊式涂层机， 通过设定二辊的周速比， 涂层辊与取液辊之间 的压力便可以对涂层厚度和涂层均匀性进行适时调节。 优化的， 取液辊、 涂层辊周速比均在 0.2-1.5之间， 两辊之间的压力为 l-50KPa。
3 ) 涂层烘烤： 本发明采用烧嘴加热的方法，加热后的空气通过上下布置的循环风箱 循环， 对带钢表面湿膜进行干燥和固化成膜， 而涂液中的水分蒸发后通过 排烟风机到大气中。
根据湿膜成膜特性，涂层烘烤采用三段式加热和冷却方法对涂层进行 烘烤成膜。 三段主要为干燥段、 烘烤段和冷却段， 其中干燥段温度在 100-400 °C , 烘烤段温度在 200~370 °C。 整个干燥固化成膜阶段， 时间为 33-144S , 其中湿膜干燥时间为 9~39S， 烘烤时间为 24 105S ; 最终形成 2~10μπι膜厚的涂层；
带钢传送：
本发明整个涂层后的干燥段和烘烤段通过与带钢不接触的传送装置 进行生产， 该传送装置可以吹出可调压力的空气用于漂浮带有湿膜的带 钢。涂有湿膜的带钢利用烘烤炉内传送装置的漂浮作用， 湿膜固化前不与 炉辊接触， 保证湿膜表面完整成膜。 气体压力在 0~2000Pa之间。
进一歩， 本发明方法还包括歩骤 4 ) 在线膜厚检测， 本发明采用常规 在线膜厚检测方法对上下两表面膜厚进行连续检测， 并具有膜厚反馈功 能。通过在线膜厚的结果与目标膜厚进行比较， 从而适时调节涂层机各参 数， 达到目标膜厚， 保证膜厚的稳定性。
采用本发明的生产工艺制备的电工钢表面厚涂层， 膜厚均匀， 附着性 好， 抗划擦性强， 具有优异的电绝缘性， 可以用于大型水电、 核电用电工 钢涂层。
本发明的主要特点：
1. 极厚涂层的涂液粘度范围在 10 80S，具有良好的流平性和涂覆性。
2. 采用二辊或三辊式涂层机进行涂覆， 以此来确定涂层厚度的控制 和调节方法， 便可实现对膜厚的精确控制。
3. 采用明火烧嘴加热和热风循环的方法进行涂层成膜， 并设置不同 温度的加热段， 以获得良好的涂层， 固化成膜时间在 33~144秒， 从而保证了涂层具有优异的附着性和绝缘性。
4. 采用非接触式带钢传送装置对带钢进行传送， 从而保证了涂层的 完整性。
5. 对环保涂层膜厚在线反馈控制， 从而有效监控膜厚， 保证膜厚的 均匀性。 本发明对大于 2μπι的涂层产品均可实现连续式生产， 从而保证不同厂
：对于膜厚的需求及涂层本身性能。 附图说明
图 1为本发明一实施例的示意图。
图 2为本发明另一实施例的示意图。 发明的详细说明
以下结合实施例对本发明的工艺作进一歩说明。
1、 采用三辊式涂层机生产
如图 1所示， 经过轧制、 退火的电工钢带钢 1通过取液辊 2、 涂层辊 3对带钢 1上下表面分别涂覆， 涂液粘度 27S , 采用三辊进行涂覆， 涂层 辊周速比 0.45， 取液辊 2周速比 0.41， 取液辊 2与计量辊 4间隙 ΙΟΟμπι, 然后在烘烤炉 5内进行成膜，采用三段式加热和冷却方法对涂层进行烘烤 成膜， 具体为干燥段 51、 烘烤段 52和冷却段 53， 干燥温度 350°C， 烘烤 温度 320°C， 固化成膜时间为 35S。 最终得到上下表面膜厚为 5μπι， 涂层 附着性为 GT0 , 层间电阻为 900Ω½πι (欧标） ， 表面质量优良的均匀厚 涂层。如超出参数优化范围所制涂层表面质量较差，存在掉粉， 附着性差， 涂层表面不均匀等问题。
其他实施例见表 1所示。
表 1
涂液 取液辊与 干燥 烘烤 成膜 涂层
实施 涂层辊 取液辊 涂层 粘度 计量辊间 温度 温度 时间 厚度
例 周速比 周速比 附着性 S 隙 μιη V V 秒 μιη
1 27 0.45 0.41 100 350 320 35 5 GT0
2 10 0.80 1.50 100 400 350 33 6 GT0
3 25 1.20 0.82 135 380 370 50 8 GT1
4 30 0.20 0.30 80 330 280 38 2 GT1
5 30 0.55 0.65 150 350 320 42 10 GT1
6 35 0.32 0.24 105 100 270 144 4 GT0
7 40 0.39 0.31 95 270 200 65 5 GT0
8 60 0.28 0.20 1 10 250 280 72 7 GT1 9 80 0.20 0.31 120 250 240 45 6 GTO
2、 采用二辊式涂层机生产
如图 2所示， 经过轧制、 退火的电工钢带钢 1通过取液辊 2、 涂层辊 3对带钢 1上下表面分别涂覆， 涂液粘度 30S。 采用二辊进行涂覆， 涂层 辊周速比 0.48， 取液辊 2周速比 0.40， 涂层辊与取液辊压力为然后在烘烤炉 5内进行成膜， 采用三段式加热和冷却方法对涂层进行烘烤成膜， 具体为 干燥段 51、 烘烤段 52和冷却段 53， 干燥温度 100 °C， 烘烤温度 220 °C， 固化成膜时间为 72S。最终得到上下表面膜厚为 5μπι，涂层附着性为 GT0 , 层间电阻为 900Ω½πι (欧标） ， 表面质量优良的均匀厚涂层。 如超出参 数优化范围所制涂层表面质量较差， 存在掉粉， 附着性差， 涂层表面不均 匀等问题。
其他实施例见表 2所示。
表 2
Figure imgf000007_0001
本发明可应用于大型水电、核电发电机及其他对绝缘性要求高的电动 机等用电工钢表面涂层生产。

Claims

权 利 要 求 书
1. 电工钢表面极厚绝缘涂层的生产方法， 其包括如下歩骤：
1 ) 涂液配制
将涂液进行充分搅拌， 搅拌时间 0.1~4小时， 根据涂液原液的 初始粘度， 对涂液原液加纯水或溶剂进行稀释， 保证粘度在 10 80S 内；
2) 带钢涂覆
采用二辊式涂层机进行上下表面分别涂覆生产，涂覆方式分为 顺涂和逆涂两种方式；
二辊式涂层机取液辊、 涂层辊周速比均在 0.2 1.5之间， 两辊 之间的压力为 l~50KPa;
3 ) 涂层烘烤
采用烧嘴加热的方法，加热后的空气通过上下布置的循环风箱 循环， 对带钢表面湿膜进行干燥和固化成膜；
涂层烘烤采用三段式烘烤成膜， 即干燥段、 烘烤段和冷却段； 其中干燥段温度在 100~400°C， 烘烤段温度在 200~370°C ; 整个干 燥段和烘烤段时间为 33~144秒， 其中干燥段时间为 9~39秒， 烘烤 段时间为 24~105秒； 最终形成 2~10μπι膜厚的涂层；
涂覆后的带钢及在涂层烘烤阶段， 带钢传送是采用与带钢不接触 的传送方法进行， 具体为通过对带钢下表面吹出可调压力的空气， 使 带钢漂浮传送， 根据带钢厚度， 气体压力在 l~2000Pa可调； 湿膜固化 前不与加热炉辊接触， 保证湿膜表面完整成膜。 2. 如权利要求 1所述的电工钢表面极厚绝缘涂层的生产方法， 其特征是， 还包括， 歩骤 4 ) 在线膜厚检测， 采用常规手段， 对带钢上下表面膜厚进 行连续在线检测， 通过在线膜厚的结果与目标膜厚进行比较， 适时调节涂 层机， 达到目标膜厚， 保证膜厚的稳定性。 3. 如权利要求 1所述的电工钢表面极厚绝缘涂层的生产方法， 其特征是， 歩骤 1 ) 涂液配制中， 粘度调整的溶剂包括乙二醇丁醚、 或丁基乙二醇。
4. 电工钢表面极厚绝缘涂层的生产方法， 其包括如下歩骤：
1 ) 涂液配制
将涂液进行充分搅拌， 搅拌时间 0.1~4小时， 根据涂液原液的 初始粘度， 对涂液原液加纯水或溶剂进行稀释， 保证粘度在 10 80S 内；
2 ) 带钢涂覆
采用三辊式涂层机进行上下表面分别涂覆生产，涂覆方式分为 顺涂和逆涂两种方式；
三辊式涂层机涂层辊、 取液辊的周速比在 0.2 1.2之间； 涂层 辊与取液辊之间的压力为 0.1~10KPa; 取液辊与计量辊之间的间隙 为 60~150μπΐ;
3 ) 涂层烘烤
采用烧嘴加热的方法，加热后的空气通过上下布置的循环风箱 循环， 对带钢表面湿膜进行干燥和固化成膜；
涂层烘烤采用三段式烘烤成膜， 即干燥段、 烘烤段和冷却段； 其中干燥段温度在 100~400 °C， 烘烤段温度在 200~370 °C ; 整个干 燥段和烘烤段时间为 33~144秒， 其中干燥段时间为 9~39秒， 烘烤 段时间为 24~105秒； 最终形成 2~10μπι膜厚的涂层；
涂覆后的带钢及在涂层烘烤阶段， 带钢传送是采用与带钢不接触 的传送方法进行， 具体为通过对带钢下表面吹出可调压力的空气， 使 带钢漂浮传送， 根据带钢厚度， 气体压力在 l~2000Pa可调； 湿膜固化 前不与加热炉辊接触， 保证湿膜表面完整成膜。
5. 如权利要求 4所述的电工钢表面极厚绝缘涂层的生产方法， 其特征是， 还包括， 歩骤 4 ) 在线膜厚检测， 采用常规手段， 对带钢上下表面膜厚进 行连续在线检测， 通过在线膜厚的结果与目标膜厚进行比较， 适时调节涂 层机， 达到目标膜厚， 保证膜厚的稳定性。
6. 如权利要求 4所述的电工钢表面极厚绝缘涂层的生产方法， 其特征是， 歩骤 1 ) 涂液配制中， 粘度调整的溶剂包括乙二醇丁醚、 或丁基乙二醇。
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