聚氨酯密封膠標準試驗條件下性能

發布時間 : 2022-12-5 11:11:53
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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.

聚氨酯密封膠標準試驗條件下性能

(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 : 2022-12-5 11:11:53
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聚氨酯密封膠在標準試驗條件下養護28d后進行力學性能測試，強度和伸長率取均值，結果如表1所示。表1強度和伸長率由表1可以看出:聚氨酯密封膠具有較高的強度，改性聚醚結構密封膠次之，硅酮結構密封膠強度較低;聚氨酯密封膠也具有較高的伸長率。雖各類結構密封膠產品可通過調整配方，適當改變其力學性能，但產品的主體結構已決定其最基本的性能參數。短期老化后性能。

1)6種產品在80℃,100℃,120℃,150℃,180℃和200℃分別放置1h，然后在相應溫度下觀察外觀變化并測試力學性能，短期高溫后性能結果如表2所示。

從表2和圖1中可以看出，短期硅酮結構密封膠耐高溫性能優于聚氨酯密封膠、改性聚醚結構密封膠，可以耐溫到200℃，外觀無明顯變化。從性能變化看，硅酮結構密封膠在180℃高溫下拉伸強度、伸長率保持較好，在200℃還保持有一定性能;改性聚醚結構密封膠的伸長率衰減較多;聚氨酯密封膠拉伸強度衰減較多、伸長率衰減較多。

2) 6種產品在一20℃、-30℃、-40℃、-45℃和-50℃分別放置1h，然后在相應溫度下觀察外觀變化并測試力學性能，短期低溫后性能結果如表3所示。

從表3和圖2中可以看出短期耐低溫性到一50℃ ,外觀無明顯變化，從性能變化看，3類結構密封膠低溫下強度變大，伸長率先高再降低。

長期老化后性能6種產品分別在80℃ , 120℃ , 150℃ , 180℃高溫箱放置720h, 1500h, 3000h和6000h，取出后在標準試驗條件下放置24h，觀察外觀變化并測試力學性能.長期高溫后性能結果如表4所示。www.qiquanonline.com

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