摘要： 【目的】自黏结涂层作为电机铁芯新型组装方式涂层，能够有效避免涂层破损引起的损耗及振动噪音。目前自黏结涂层存在活化态（ B状态）和完全固化态（ C状态）性能相互影响的平衡难题。为了解决该问题，设计兼具力学性能、防腐性能与黏结强度的自黏结涂层。【方法】使用醇酸树脂与微胶囊固化剂共混改性异氰酸酯固化体系环氧树脂，获得 B/C状态固化互不影响的无取向硅钢复合自黏结涂层。通过热重分析和红外表征研究确定不同状态涂层的固化过程及固化工艺，研究了改性醇酸树脂与环氧树脂质量比、一次固化温度以及不同微胶囊添加量对涂层附着力、耐腐蚀性以及黏结强度等综合性能的影响。【结果】改性环氧树脂、改性醇酸树脂与微胶囊的质量比为 2∶2∶1时最佳，一次固化最佳工艺为 100 ℃下加热 60 s，二次固化最佳工艺为压力 3 MPa、200 ℃下加热 2h，该条件下涂层的 T型剥离强度达到 4. 03 N/mm、附着力达 0级、铅笔硬度达 5H、中性盐雾实验 24 h腐蚀面积小于 1%。【结论】该涂层获得良好 B状态性能的同时保证了 C状态黏结强度，基本满足自黏结叠片铁芯工艺应用技术要求。
关键词:
无取向硅钢,
自黏结涂层,
微胶囊,
环氧树脂,
醇酸树脂
Abstract: ［Objective］The non-oriented silicon steel self-bonding coating，as a novel assembly method coating for motor cores，could effectively prevent losses and vibration noise caused by coatingdamage. The self-bonding coating exists in three states：liquid state（State A），activated state（State B）， and fully cured state（State C）. Currently，there existed a challenging balance between the mutuallyinfluential properties of State B and State C coatings. Designing coatings that integrate mechanicalperformance，corrosion resistance，and bonding strength had become an urgent issue to address for self-bonding coatings.［Method］To resolve these challenges，this study employed alkyd resin and microencapsulated curing agents to modify the isocyanate-cured epoxy resin system，ultimately developing a composite self-bonding coating for non-oriented silicon steel with mutually independent curing processes between States B and C. The curing process and parameters were determined through thermogravimetric analysis and infrared spectroscopy of coatings in different states. The effects of mass ratios between modified alkyd and epoxy resins，primary curing temperatures，and microcapsule addition amounts on coating adhesion，corrosion resistance，and bonding strength were systematically investigated.［Results］The optimal formulation was achieved with a mass ratio of modified epoxy resin∶ modified alkyd resin∶microcapsules at 2∶2∶1. The optimal primary curing process involved heating at 100℃ for 60s，while the secondary curing process required 3 MPa pressure at 200 ℃ for 2 h. Under these conditions，the coating demonstrated a T-type bonding peel strength of 4. 03 N/mm，Class 0 adhesion，5H pencil hardness，and less than 1% corrosion area after 24-hour neutral salt spray testing.［Conclusion］This coating achieved excellent State B performance while maintaining State C bonding strength，essentially meeting the technical requirements for self-bonding laminated core applications.
Key words:
non-oriented silicon steel,
self-bonding coating,
microcapsule,
epoxy resin,
alkyd resin
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