白油與硅烷改性聚氨酯密封膠

發布時間 : 2024-9-11 10:52:27
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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.

白油與硅烷改性聚氨酯密封膠

(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 : 2024-9-11 10:52:27
Views:

為進一步獲得更為穩定、與真實情況接近的分子模型，在初始模型基礎上對各體系分子模型進行結構優化與退火處理。首先利用Smart優化算法選擇能量最低的構型進行結構優化，然后對其進行5個循環，溫度梯度50K，從300K升溫到600K再降溫到300K等溫等壓(NPT)系綜的退火處理，這一過程可消除所構建模型中產生的局部不合理結構，為下一步動力學計算提供一個結構較為合理的構型，以確保動力學計算能夠成功行，退火后模型如圖3所示。退火結束后，在298K溫度下，首先進行100ps的正則系綜(NVT)動力學模擬穩定系統，然后進行500ps的等溫等壓(NPT)系綜動力學模擬調節密度，使體系接近真實的密度值。動力學計算結束后，將模擬后的體系密度與材料的真實密度對比，兩者結果相差不大。純物質體系時間一密度關系如圖4(a-c)所示。由圖可見，白油、甲基硅油、硅烷改性聚氨酯密封膠純物質體系的密度分別約為0.811g/cmi1.021g/cmi1.029g/cmi，接近它們的真實密度0.816g/cmi0.974g/cmi1.067g/cmi(其中硅烷改性聚氨酯密封膠的真實密度參照107硅橡膠)。共混體系時間一密度關系如圖4(d-e)所示，硅烷改性聚氨酯密封膠/白油與硅烷改性聚氨酯密封膠/甲基硅油共混體系在模擬結束后的最終密度分別約為0.925g/cm;L022g/cmy，也接近它們的理論共混密度0.9}1g/cmy1.020g/cmi，這說明所建的模型是可靠的。最后在ForciteAnalysis中對后50ps的軌跡數據進行分析得到內聚能密度(CED>、溶度參數(S>、徑向分布函數(RDF>，在BlendAnalysis中計算得到結合能、混合能和Flory-Huggins相互作用參數(X>0整個模擬過程選用COMPASSII力場口習，按力場分配電荷，時間步長lfs，每lps記錄一次軌跡。模擬采用Andersen方法控溫器+>>Berendsen方法控壓器C7，壓力為0.OOOlUPa。靜電作用和范德華作用求和方法分別采用Ewald方法和Atom-based方法，非鍵截取半徑取15.5人，樣條寬度取1人，緩沖寬度取0.5人。http://www.qiquanonline.com/

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上一篇: 防止單組分丁基防水嵌縫膠固化物產生缺欠有效方法

下一篇: 研究以白油體系丁基防水嵌縫膠/白油共混體系為例