硅烷改性聚氨酯密封膠在高溫下的耐久性

發布時間 : 2025-1-22 15:46:56
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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.

硅烷改性聚氨酯密封膠在高溫下的耐久性

(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 : 2025-1-22 15:46:56
Views:

從表可知，不同牌號硅烷改性聚氨酯密封膠在高溫下的耐久性沒有統一規律，造成以上差異的主要原因是配方差異所致。硅烷改性聚氨酯密封膠分子在高溫環境中始終存在兩個方向的變化，一個是未反應完的交聯劑偶聯劑與主鏈上輕基繼續反應，交聯度提高;另一個是分子鏈斷裂。當交聯度提高作用大于分子鏈斷裂作用時，拉伸強度提高;反之，拉伸強度減小。幾種硅烷改性聚氨酯密封膠之間配方設計不同，交聯度不同，粘接能力也不同，導致了長期高溫老化后的不同變化趨勢。

結語

(1)在溫度一30200℃內，隨測試溫度升高，拉伸粘接強度和伸長率以近似線性下降趨勢變化;但每種硅烷改性聚氨酯密封膠降幅不同，所測6個牌號硅烷改性聚氨酯密封膠拉伸粘接強度降幅在(2.8%-4.3%)/10℃，伸長率降幅在(2%-4.5%)/10℃。

(2)同一溫度長期耐久性因老化溫度不同有不同結果，在溫度90,120℃環境中老化1年，硅烷改性聚氨酯密封膠拉伸粘接強度變化率不超過20%，未出現粘接破壞現象，可認為在溫度120℃環境中使用1年硅烷改性聚氨酯密封膠與玻璃和鋁基材的粘接仍然可靠。在溫度150℃老化8個月、溫度180℃老化5個月時硅烷改性聚氨酯密封膠失去彈性，發生大面積粘接破壞現象，所以在溫度超過150℃長期使用時，應考慮硅烷改性聚氨酯密封膠與玻璃的粘接性問題。

(3)同一溫度長期耐久性因配方差異有不同結果，硅烷改性聚氨酯密封膠1#,2#,6#在發生粘接失效前拉伸強度大于初始值，硅烷改性聚氨酯密封膠3#在發生粘接失效前拉伸強度幾乎都小于初始值。http://www.www.machasoul.com/

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