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促進劑DM對BIIR基體的自修復(fù)聚氨酯密封膠的影響
- 發(fā)布時間 : 2023-3-10 18:05:44
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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.
促進劑DM對BIIR基體的自修復(fù)聚氨酯密封膠的影響
(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 : 2023-3-10 18:05:44
- Views:
Information
促進劑DM是苯并嚎哇類的物質(zhì)，可與鹵化丁基橡膠上的鹵素原子發(fā)生反應(yīng)并把自己身接枝上去，消耗了硫化反應(yīng)中大分子上的活性位點，也可以一定程度上控制交聯(lián)密度。DM本身還是一種促進劑，可起到兩方面的作用。因此，若把本章前幾節(jié)所用的配方中的基體由丁基橡膠替換為澳化丁基橡膠，便可以嘗試用促進劑DM來進行調(diào)控交聯(lián)密度。為了探究促進劑DM對澳化丁基橡膠為基體的聚氨酯密封膠性能的作用效果，本文以表2-4所示的配方進行了以下實驗。促進劑DM對澳化丁基橡膠為基體的膠料的硫化特性的影響。
如圖3-21所示，本節(jié)以促進劑DM的份數(shù)為變量，對比測試了硫化特性曲線。由上圖可知，當(dāng)不加入DM時，由于沒有其他促進劑的存在，0M和MH都比較小，加入DM后明顯△M增大，但隨著DM用量增加，OM逐漸減小，直至DM增至Sphr后不再減小。DM添加量增至5phr后不再減小的原因時此時澳化丁基橡膠的鹵素原子會被耗盡，再增加也無濟于事，用DM調(diào)控澳化丁基橡膠為基體的聚氨酯密封膠，調(diào)控范圍有限，且粉料得分散性也不是很理想，對交聯(lián)度得降低并不均勻，使得膠料易發(fā)生內(nèi)聚破壞。m.hbxqtax.com
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