硅烷改性聚氨酯密封膠膠料的挺性
2025-05-26
推薦新聞
MS密封膠高壓膠管內(nèi)膠硬度
2025-05-26
丁基防水嵌縫膠的力學(xué)性能
2025-05-26
新型高溫高壓丁基防水嵌縫膠膠筒
2025-05-25
新型高溫高壓硅烷改性聚氨酯密封膠配方設(shè)計...
2025-05-25
硫磺用量對硅烷改性聚氨酯密封膠膠料初粘性的影響
- 發(fā)布時間 : 2023-3-9 11:43:17
- Views:
(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.
硫磺用量對硅烷改性聚氨酯密封膠膠料初粘性的影響
(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 11:43:17
- Views:
Information
硫磺用量對硫化性能的影響雖然使自修復(fù)輪胎氣密膠適度交聯(lián)可以極大延長弛豫時間，封鎖冷流性，抑制氣密膠持續(xù)浸入輪胎破孔，但為保證氣密膠具有較低的模量和較高的自粘性與互粘性，不宜硫化過度，否則硅烷改性聚氨酯密封膠會硬化，失去粘性。故應(yīng)當(dāng)在硅烷改性聚氨酯密封膠膠料高溫下不發(fā)生流淌和內(nèi)聚破壞的前提下，盡可能降低硅烷改性聚氨酯密封膠膠料的模量和粘度以增加粘性。
首先，本文使用了最直接的降低交聯(lián)密度的方法，便是減少硫磺的用量。減少硫磺用量，最直接地減少了硫化過程中形成的交聯(lián)點，從而抑制了硫化過程硅烷改性聚氨酯密封膠膠料的硬化、模量的增加和粘性地的降低。
圖3-3表3-3為硫磺用量對硫化特性的影響。由圖表可知，由于硫磺添加份數(shù)的降低，交聯(lián)鍵的減少，隨著硫磺用量從!.25份降低至0.25份，MH從0.32 dN m降低至0.21 dNm。因此可知控制硫磺用量是調(diào)節(jié)交聯(lián)密度的最直接最簡單的方法。
自修復(fù)輪胎硅烷改性聚氨酯密封膠是半固態(tài)的性狀，只需要施加較小的壓力即可浸潤輪胎內(nèi)壁，緊密貼合，形成有一定強度的接頭，在輪胎內(nèi)壁，輪胎壓力是持續(xù)的，不會發(fā)生明顯變化，受到長期持續(xù)的壓強，硅烷改性聚氨酯密封膠膠料主要表現(xiàn)的就是液體的粘性的特征，能夠使得硅烷改性聚氨酯密封膠盡可能地浸入內(nèi)面膠的坑洼凹槽中，形成粘合力。粘合原理類似于壓敏膠，因此，該硅烷改性聚氨酯密封膠可以用壓敏膠的粘合機理進(jìn)行分析與討論。通常情況下，壓敏膠的模量和粘度越小，越容易在壓力作用下與被粘物結(jié)合，粘性越大，也越容易粘住輪胎的破孔。通過硫磺用量可改變硅烷改性聚氨酯密封膠膠料的初粘性。
如圖3-4，此圖為硫磺用量對硅烷改性聚氨酯密封膠膠料初粘性的影響。如圖3-4所示，隨著硫磺用量由1.25份減少到0份，硅烷改性聚氨酯密封膠膠料的初粘性由28漲到了32以上。由于交聯(lián)度隨硫磺用量減小而減小，硅烷改性聚氨酯密封膠膠料的模量和粘度均有下降，使得硅烷改性聚氨酯密封膠膠料更容易在一定作用力下與被粘物形成浸潤和粘結(jié)結(jié)構(gòu)，從而使得較量初粘性上升。
但是，直接減少硫磺用量也會降低起硫反應(yīng)區(qū)域的數(shù)量，會造成交聯(lián)密度降低的不均勻，使得硅烷改性聚氨酯密封膠膠料更容易應(yīng)力松弛，降低硅烷改性聚氨酯密封膠膠料的內(nèi)聚力。若硅烷改性聚氨酯密封膠膠料強度過低，則輪胎在扎胎后硅烷改性聚氨酯密封膠在胎壓地推動下擠入破孔后即刻便會發(fā)生內(nèi)聚破壞，使得氣密膠源源不斷擠出輪胎，使得硅烷改性聚氨酯密封膠的自封堵性能失效。
因此，本文通過對其持粘性的測試表征其抗流動性，從而兼顧硅烷改性聚氨酯密封膠膠料的抗流動性和粘性。
Scan the QR code to read on your phone
+86-
13573398725
sdyuantai@163.com
搜索