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正十二硫醇對微交聯(lián)型MS密封膠性能的影響
- 發(fā)布時間 : 2023-3-9 11:50:50
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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.
正十二硫醇對微交聯(lián)型MS密封膠性能的影響
(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 : 2023-3-9 11:50:50
- Views:
Information
本文所用基體之一為丁基橡膠，軟化劑為數(shù)均分子量僅2300的聚異丁烯，此丁基橡膠飽和度僅1.7%士0.2%，又因為聚異丁烯端基都存在一個雙鍵，故使用硫磺硫化的過程中會產(chǎn)生大量聚異丁烯端基被硫磺連接以及聚異丁烯接枝到丁基橡膠上的情況，反而丁基橡膠內(nèi)部產(chǎn)生交聯(lián)的情況不會特別多。
在本文所制備的MS密封膠中添加疏基化合物后，疏基化合物可與高分子材料中的碳碳雙鍵產(chǎn)生Th iol-ene點擊反應(yīng)，消耗掉雙鍵的同時，可將自身接枝到丁基橡膠分子鏈上，也可能對聚異丁烯進(jìn)行封端，減少了丁基橡膠的交聯(lián)鍵。由于正十二硫醇是液體小分子，在混煉膠陳化的過程中更容易均勻滲透到濃厚膏狀的膠料當(dāng)中，相比于直接減少硫磺用量的方式降低交聯(lián)密度，通過琉基化合物調(diào)節(jié)交聯(lián)度的方法更加均勻。為了探究硫醇對自修復(fù)MS密封膠性能的作用效果，本文以表2-3所示的配方以硫醇用量為變量進(jìn)行了以下實驗。正十二硫醇用量對微交聯(lián)型MS密封膠硫化特性的影響為探究正十二硫醇對交聯(lián)度的調(diào)節(jié)效果，本文以表2-3設(shè)置以正十二硫醇用量為變量的實驗來對比其硫化曲線的不同，下圖3-7表3-5為正十二硫醇添加量對膠料硫化性能的影響。
由上圖表可知，隨著硫醇加入量從Ophr增加到6.Sphr，丁基橡膠主鏈的雙鍵減少，交聯(lián)鍵減少，聚異丁烯封端，與丁基橡膠接枝的聚異丁烯減少，另外十二硫醇鏈長較聚異丁烯短，在以上原因的作用下，硫化特性數(shù)據(jù)中△M從0.27dN m減小O.OSdNm MH減小。膠料所含的高活性的低分子量聚異丁烯端基含有端位雙鍵，因此在硫化時，部分高活性的低分子量聚異丁烯參與微交聯(lián)反應(yīng)，使丁基橡膠主鏈產(chǎn)生梳型結(jié)構(gòu)。且高活性的低分子量聚異丁烯端位雙鍵可與琉基反應(yīng)而發(fā)生封端反應(yīng)，使得部分聚異丁烯不參與微交聯(lián)，單純作為軟化劑和增粘劑。據(jù)此分析，所述微交聯(lián)MS密封膠結(jié)構(gòu)如下圖3-8所示。
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