聚氨醋改性后的單組分聚氨酯密封膠的低溫性...
2026-01-15
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預(yù)聚體NCO含量對(duì)硅烷改性聚氨酯密封膠性能的影響
- 發(fā)布時(shí)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(yù)聚體NCO含量對(duì)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(fā)布時(shí)間 : 2023-4-8 17:12:58
- Views:
Information
B組分相同時(shí)，若A組分預(yù)聚體NCO含量過低，會(huì)出現(xiàn)硅烷改性聚氨酯密封膠發(fā)粘、發(fā)軟等現(xiàn)象;預(yù)聚體NCO含量過高，生成更多的K基甲酸醋，形成更強(qiáng)的氫鍵作用，硅烷改性聚氨酯密封膠強(qiáng)度增加，但氫鍵會(huì)阻礙分子間的相對(duì)運(yùn)動(dòng)，表現(xiàn)為斷裂伸長(zhǎng)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(yù)聚體NCO含量的提高，硅烷改性聚氨酯密封膠的拉伸強(qiáng)度增大，斷裂伸長(zhǎng)率減小。這是因?yàn)橛坞x異氰酸醋基團(tuán)的比例增加，導(dǎo)致聚氨醋分子柔性鏈比例降低，硬段比例提高。當(dāng)預(yù)聚體NCO質(zhì)量分?jǐn)?shù)5. 7%時(shí)，硅烷改性聚氨酯密封膠的表干時(shí)間3.6 h，斷裂伸長(zhǎng)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(duì)低模量高彈性硅烷改性聚氨酯密封膠的要求。www.kubee.cn
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