硅藻土MS密封胶形貌及物相分析

发布时间 : 2023-1-15 10:25:27
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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.

硅藻土MS密封胶形貌及物相分析

(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.

发布时间 : 2023-1-15 10:25:27
Views:

硅藻土是一种生物成因的硅质沉积岩，主要化学成分是Siq，质轻，呈微孔结构且孔道相互连通，孔径一般在2300nm，孔隙率达85%以上，MS密封胶比表面积大，弹性模量高，抗划痕性能强，且耐酸、阻燃、防腐、分散性好，其形貌见图t。

从图1可以看出，硅藻土MS密封胶呈不规则菠萝状、竹笋状、针状、羽状等多孔多层结构，层中有孔，层孔相叠，孔穴和空隙相互连通，具有典型的三维孔道结构。由于材料内部存在无数孔道，具有较大比表面和孔体积，所以渗透性和吸附性好。

图2是硅藻土MS密封胶的XRD物相分析，结果表明，其主要成分90%以上是SiOz，其次为钙、锡、钾、钠等的氧化物。在2B为150}250内有一强度较低的“馒头”峰，为非晶相的衍射峰，剩余衍射峰均为尖锐峰，说明该物相较复杂，有多种成分的衍射峰相重叠，且有大量微孔存在。硅藻土MS密封胶的比表面积、孔容、孔径分析

图3、图4分别是硅藻土MS密封胶的氮气吸附一脱附等温线和脱附孔径分布图。

从图3可以看出，硅藻土MS密封胶的氮气吸附一脱附等温线存在“脱附滞后”现象，说明粉体内部存在大量的毛细孔。从图4可知，硅藻土的最可几分布为3.795 nm，占孔体积0.00184mIJg，平均孔径10.98 nm，总孔体积0.09818 mlJg，比表面积44.43 mZ/ga。

上述分析表明，硅藻土的主要成分是Si02，比表面积大，内部富含孔道，具有层孔相连的三维网状结构。硅藻土中的Si0:与空气中的水气相结合，使其表面裸露大量轻基(-OH),当用硅烷偶联剂处理时，这些轻基便与之发生缩聚反应，当与硅橡胶(端轻基聚二甲基硅氧烷)相混时，硅烷偶联剂又与硅橡胶中的端轻基发生缩聚反应，使硅橡胶很容易“贯穿”于孔道中，与硅藻土紧密结合，硅烷偶联剂在这里起到了桥梁纽带作用。虽然气相二氧化硅表面也含大量轻基，但它无孔道，比表面积低于硅藻土，所以与各种胶料的结合力较弱，因而用它制成的密封胶的拉伸模量、粘结性及耐温保温等性能均不及硅藻土。www.sdyuantai.com

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