聚醚三醇與二醇配比對聚氨酯密封膠性能的影響

發布時間 : 2022-12-9 18:53:21
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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.

聚醚三醇與二醇配比對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 : 2022-12-9 18:53:21
Views:

由圖2可見，聚氨酯密封膠所有預聚體的FT}R譜都很類似，在3 445 cm附近沒有經基對應的寬峰，表明聚醚多元醇和TDI反應完全。聚氨酯密封膠在2 972 cm和2 870cm‘處為C-H的反對稱伸縮振動吸收峰。在3 309 cm和1 537 cm處分別對應于H-NC00的伸縮、彎曲振動，1 726 cm處為碳基的特征峰，表明生成了氨基甲酸酚結構。在2 274 cm處為異氰酸基團的特征吸收峰。在1 107 cm處的強吸收峰為聚醚多元醇C-O-C的伸縮振動峰。聚氨酯密封膠在1 600cm‘和1 450 cm處為TDI苯環上Ar-H的伸縮振動峰。以上分析表明預聚體制備成功。

聚醚三醇能夠提高材料的強度和回彈性，聚醚二醇有利于增加材料的斷裂伸長率。在應用中，若聚氨酯密封膠模量過高，混凝土接縫發生較大的變形時，由于聚氨酯密封膠的本體拉伸強度過高，易導致聚氨酯密封膠在混凝土接縫界面發生粘接破壞。而低模量聚氨酯密封膠，其本體拉伸強度低于界面粘接強度，不會發生界面脫粘。在本研究中，固定R值為2.5，固化劑采用B2配方，考察了預聚體中EP 330NG與DL 1000D摩爾比對聚氨酯密封膠性能的影響，結果見表3。

由表3可知，隨著預聚體中聚醚三醇含量降低，聚氨酯密封膠的拉伸強度下降，斷裂伸長率提高，拉伸模量降低。因此，通過調整n} w2可以調節聚氨酯密封膠的強度和模量。聚氨酯密封膠的表干時間由4.5 h縮短至3.6 h這是由于預聚體的NCO質量分數由4.6%提高至5.2%，所以固化變快。www.qiquanonline.com

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