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硅烷改性聚氨酯密封膠固化樣的制備
- 發(fā)布時間 : 2026-7-8 11:20:08
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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固化樣的制備
(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)布時間 : 2026-7-8 11:20:08
- Views:
本研究以硅烷改性聚氨酯密封膠為基體樹脂,通過添加填料、光穩(wěn)定劑、增塑劑、觸變劑、偶聯(lián)劑、催化劑等制備了硅烷改性聚氨酯密封膠,探究了4種無機顏料和光穩(wěn)定劑對硅烷改性聚氨酯密封膠耐紫外老化性能的影響,驗證了氧化鋅包覆碳酸鈣(CaCOZn0)提高硅烷改性聚氨酯密封膠耐紫外性能的效果,通過傅里葉變換紅外光譜分析等推斷了硅烷改性聚氨酯密封膠的紫外老化機理。
將硅烷改性聚氨酯密封膠加入到動力混合機中,升溫至120℃抽真空脫水2h,待釜內溫度降至40℃以下,在氮氣保護下加入質量分數(shù)0. 1%的催化劑,并在真空條件下混合均勻,最后迅速將物料壓入膠管中。將膠管中的物料擠入100mm X 100mm X 2mm的模具中刮平,放入70℃烘箱加速固化3d。取出冷卻,裁成lOmm X lOmm X 2mm的方形,備用。
硅烷改性聚氨酯密封膠及其啞鈴試件的制備
將一定量的硅烷改性聚氨酯密封膠、增塑劑、填料添加至動力混合機中,攪拌并升溫至120℃后真空脫水2h。脫水后降溫至40℃以下,在氮氣保護下依次加入除水劑、偶聯(lián)劑、催化劑,并在真空條件(一0. 09MPa)下混合均勻,最后迅速將物料壓入膠管中。將膠管中的物料擠入100mm X 100mm X 2mm的模具中刮平,放入70℃烘箱中加速固化3d。取出冷卻后,根據(jù)UB/T 528-2009制成啞鈴試件,備用。空白樣1和硅烷改性聚氨酯密封膠(試樣1-6)的實驗配方見表1;空白樣2及Zn()包覆量不同的硅烷改性聚氨酯密封膠(試件7-8 >的實驗配方見表2。其中,欽白粉、Zn0、白炭黑、炭黑、聚酞胺蠟在加熱脫水前加入至動力混合機中,光穩(wěn)定劑Tinuvin326Tinuvin770在降溫至40℃后首先加入至動力混合機中。
紫外老化實驗
將1.2.1節(jié)制備的試樣放入老化箱,在1000 W汞燈下,紫外老化Oh,lOh,24h;將1.2.2節(jié)制備的啞鈴試件放入老化箱,在1000W汞燈下,紫外老化Oh,24h。
分析與測試
采用傅里葉變換紅外光譜儀對硅烷改性聚氨酯密封膠固化樣進行結構表征;采用紫外一可見分光光度計測定欽白粉、Zn0、白炭黑、炭黑和CaCOZn0的紫外吸收光譜;采用場發(fā)射掃描電子顯微鏡和透射電子顯微鏡觀察和分析CaCOZn()的形貌及元素分布;采用電子萬能試驗機測定啞鈴試件的力學性能,拉伸500mm/minx。http://www.mychangxin.com/
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