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      聚氨酯密封膠樣品的制備和測試

      • 發布時間 : 2024-5-15 19:32:27
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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.

      聚氨酯密封膠樣品的制備和測試

      (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 : 2024-5-15 19:32:27
      • Views:
      Information

             所用金屬樣片為陽極化處理的鋁片和鍍福鋼片,所用聚氨酯密封膠為自制。測試用聚氨酯密封膠樣品的制備方法如下:

             用脫脂棉蘸丙酮溶劑將金屬表面清潔,晾置;(2)90min后用毛刷在金屬表面上刷上一薄層剛剛混合均勻的底涂劑;<3)4h后將混合均勻并真空脫泡的面膠涂于底涂劑上。30min后將兩涂完面膠的試樣粘合、施壓;(4)將施壓后放置12h的金屬置于80 ℃的烘箱中后固化4h;(5)在室溫20 ℃以上放5天后測定物理性能。

             剪切強度、剪切斷裂伸長率按GB 7124-86測試。NCO指數對性能影響指數是指聚氨酯密封膠體系中NC和OH基的摩爾比,該指數決定了聚氨酯密封膠體系的封端基團和分子量。由圖1可看出,所測剪切強度隨著NCO的逐步過量而不斷上升,直至NCO:OH超過2:1時才有所下降。剪切強度隨NCO指數上升的原因是金屬表面一般存在著吸附水,即使經過打磨處理的金屬表面也存在微量的吸附水或金屬氧化物水合物,-NC(〕可與水反應生成的脈鍵與金屬氧化物之間由于氫鍵而鰲合形成酞脈一金屬化物絡合物,-NCO基團還能與金屬水合物形成共價鍵等。因此隨著游離一NCO的增多,底涂與金屬之間的附著力會逐步增加。且適當過量的一NO)基團會和氨基甲酸醋基<-NH-CO-NH-)反應,使聚氨酯密封膠產生適度的交聯,從而提高聚氨酯密封膠力學強度。http://m.inaodoi.com/

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