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新能源汽車車身后蓋流水槽MS密封膠開裂分析
- 發布時間 : 2025-5-14 10:46:14
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(Summary description)Customized SILICONE STRUCTURAL SEALANT from China manufacturer refers to the adhesive with high strength, can bear large load, aging resistance, fatigue resistance and corrosion resistance, and has stable performance within the expected life. It is suitable for bearing the bonding of strong structural parts. Non structural adhesive has low strength and poor durability. It can only be used for bonding, sealing and fixing of ordinary and temporary properties, and cannot be used for structural adhesive bonding. NEUTRAL SILICONE WETHERPROOF SEALANT from China manufacturer is a structural adhesive with waterproof function. Silicone glue refers to the adhesive based on silicone rubber. According to different functions, it can be divided into structural adhesive, potting adhesive, sealant, thermal conductive adhesive, flame retardant adhesive and so on.
新能源汽車車身后蓋流水槽MS密封膠開裂分析
(Summary description)Customized SILICONE STRUCTURAL SEALANT from China manufacturer refers to the adhesive with high strength, can bear large load, aging resistance, fatigue resistance and corrosion resistance, and has stable performance within the expected life. It is suitable for bearing the bonding of strong structural parts. Non structural adhesive has low strength and poor durability. It can only be used for bonding, sealing and fixing of ordinary and temporary properties, and cannot be used for structural adhesive bonding. NEUTRAL SILICONE WETHERPROOF SEALANT from China manufacturer is a structural adhesive with waterproof function. Silicone glue refers to the adhesive based on silicone rubber. According to different functions, it can be divided into structural adhesive, potting adhesive, sealant, thermal conductive adhesive, flame retardant adhesive and so on.
- 發布時間 : 2025-5-14 10:46:14
- Views:
針對新能源汽車車身后蓋流水槽MS密封膠開裂的案例進行分析時,經初步分析,常見的因素有PVC質量不達標、烘烤溫度不當、人為操作不當等。例如,使用了存在質量問題的MS密封膠材料;流水槽部位可能因為設計或工藝問題存在應力集中現象,尤其在使用過程中承受較大的外力或壓力時,MS密封膠的性能可能不穩定,導致開裂;如果MS密封膠涂布不均勻或涂膠量過大,可能會導致局部區域膠水硬化過快或產生應力,最終導致開裂。此外,操作人員方面存在較大的風險,特別是在進行頂蓋黑頂遮蔽時,面漆操作人員需要利用輔助工具將藍色膠帶壓緊分界線,輔助工具與流水槽的粗密封膠上邊緣之間可能會發生干涉,導致工具刮破粗密封膠表面,出現明顯的膠層開裂現象。膠泡缺陷PVC材料具有良好的可塑性,但在烘烤過程中時常出現膠泡質量缺陷問題。焊縫起膠泡的典型照片經過梳理分析,MS密封膠泡產生的主要原因主要包括以下幾方面內容。
車體涂覆MS密封膠后,膠層內部與基體之間可能存在空氣、水分等,如果在烘烤時,如果含有水分等雜質,從而引發膠泡現象。例如,在更換膠時可能會引入一部分空氣,這時在打膠過程中,往往出現“炸槍”現象,這種情況在實際生產中易于發現。另外,在進行MS密封膠作業前,如果采用濕打磨的方式對電泳車身進行處理,會導致殘留的水分進入到焊縫或其他微小縫隙之中,在對這些區域涂覆MS密封膠時,部分水分就會被封閉在內部,難以自然揮發;隨后,在經過高溫烘烤工藝時,封閉在焊縫或折邊內部的水分因受熱而迅速氣化并膨脹,導致局部壓力升高,由于MS密封膠在未完全固化前仍具有一定的可塑性,這種水汽的膨脹作用會使得MS密封膠層鼓起,形成膠泡缺陷。http://www.www.sunsage.net/
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