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                              預聚體NCO含量對硅烷改性聚氨酯密封膠性能的影響

                              • 發布時間 : 2023-4-8 17:12:58
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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.

                              預聚體NCO含量對硅烷改性聚氨酯密封膠性能的影響

                              (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 : 2023-4-8 17:12:58
                              • Views:
                              Information

                                     B組分相同時,若A組分預聚體NCO含量過低,會出現硅烷改性聚氨酯密封膠發粘、發軟等現象;預聚體NCO含量過高,生成更多的K基甲酸醋,形成更強的氫鍵作用,硅烷改性聚氨酯密封膠強度增加,但氫鍵會阻礙分子間的相對運動,表現為斷裂伸長率變差。B2和A3,A4,AS,A6制得硅烷改性聚氨酯密封膠的性能見表4。

                                     由表4可知,隨著預聚體NCO含量的提高,硅烷改性聚氨酯密封膠的拉伸強度增大,斷裂伸長率減小。這是因為游離異氰酸醋基團的比例增加,導致聚氨醋分子柔性鏈比例降低,硬段比例提高。當預聚體NCO質量分數5. 7%時,硅烷改性聚氨酯密封膠的表干時間3.6 h,斷裂伸長率)957%,拉伸模量蕊0. 29 MPa,能夠滿足道橋工程高位移伸縮縫對低模量高彈性硅烷改性聚氨酯密封膠的要求。www.www.lustload.com

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