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      影響丁基防水嵌縫密封膠體系的軟硬段分離

      • 發布時間 : 2024-5-15 19:41:18
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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.

      影響丁基防水嵌縫密封膠體系的軟硬段分離

      (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 19:41:18
      • Views:
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             但是當一NCO基團過量到一定程度時,則會導致丁基防水嵌縫密封膠體系的分子量下降,同時會產生過度交聯,影響丁基防水嵌縫密封膠體系的軟硬段分離,從而會導致底涂劑內聚強度的下降。因此在游離-NCO基團增加到一定程度時會出現粘接強度的突然下降。堿式硅鎬酸鉛鹽對性能的影響 堿式硅鉻酸鉛添加到底涂劑中可起到抑止金屬表面被腐蝕的作用閉,同時該類無機鹽的加人還可以增加底涂劑的表面面積和粗糙度,從而提高底涂劑對丁基防水嵌縫密封膠的附著力。如圖2所示,堿式硅錫酸鉛在底涂劑的表面產生大量的直徑約為從2m的突起。由圖3可以看出,隨著堿式硅錫酸鉛的加人,丁基防水嵌縫密封膠粘接金屬的剪切強度迅速提高。當其添加量占B組分固含量的400-66%時,剪切強度趨于穩定,緩慢下降;而超過60%以后剪切強度又突然下降。

             從剪切破壞試驗中同時發現,堿式硅錫酸鉛的加人不但可以大幅提高剪切強度,同時也減少了試樣破壞時底涂劑從金屬表面脫落的比例。如圖4所示:當不加堿式硅銅酸鉛時,剪切破壞主要發生在底涂一金屬界面上;當加人鉛鹽時,底涂-金屬界面破壞的比例迅速下降,并在40%含量時底涂一金屬界面破壞面積最小。因此可以得出結論,加人適量的鉛鹽,不但提高底涂劑對密封膠的粘接性能,同時也提高了對金屬的附著力。http://m.inaodoi.com/

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