硅烷改性聚氨酯密封膠膠料的挺性
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硫磺用量對(duì)聚氨酯密封膠膠料持粘性的影響
- 發(fā)布時(shí)間 : 2023-3-9 11:47:16
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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.
硫磺用量對(duì)聚氨酯密封膠膠料持粘性的影響
(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(shí)間 : 2023-3-9 11:47:16
- Views:
Information
硫磺用量會(huì)影響聚氨酯密封膠膠料的模量和粘度，從而影響聚氨酯密封膠膠料的表面粘性。若聚氨酯密封膠膠料粘性不足，則發(fā)生界面剝離，若聚氨酯密封膠膠料強(qiáng)度、內(nèi)聚力不夠，則聚氨酯密封膠膠料發(fā)生內(nèi)聚破壞，在這兩種作用下，硫磺用量存在一個(gè)理論上地最佳值。圖3-5為硫磺用量對(duì)聚氨酯密封膠膠料持粘性的影響。
由圖3-5可知，所測(cè)幾種配方當(dāng)中，添加0.25phr硫磺的持粘性最強(qiáng)，但發(fā)生了內(nèi)聚破壞，故實(shí)際最大值在0.25phr與0.75phr之間，為O.Sphr左右。但由于本文聚氨酯密封膠膠料所測(cè)持粘性是按照標(biāo)準(zhǔn)GB/T4851-2014所測(cè)，測(cè)試長度為40mm，故聚氨酯密封膠膠料所承載的力與輪胎發(fā)生破損時(shí)破孔附近的聚氨酯密封膠膠料所承受的力并不在同一量級(jí)上，且所受力的力的大小還會(huì)因?yàn)檩喬テ瓶壮叽纭⒃敕绞胶臀恢卯a(chǎn)生不同，故此結(jié)果僅作為參考，實(shí)際效果仍需要將聚氨酯密封膠膠料涂敷至輪胎內(nèi)側(cè)，輪胎充氣并扎破后測(cè)試自封堵效果。但就此實(shí)驗(yàn)效果來看，本文制備的密封膠在持粘性方面優(yōu)于市售產(chǎn)品。硫磺用量對(duì)聚氨酯密封膠膠料與玻璃紙間的T型剝離強(qiáng)度的影響如前文所述，本文所述氣密膠的粘性可類比壓敏膠，壓敏膠的剝離強(qiáng)度的D.H.Kaeble表達(dá)式一般可簡(jiǎn)化為為式1-2，此式表明，剝離強(qiáng)度與模量成反比，所以模量越低則粘性越強(qiáng)。
由于硫磺用量的減少，降低了M-,和△M，使得聚氨酯密封膠膠料模量降低，表面粘性得到顯著提升。
本文中T型剝離強(qiáng)度按照國標(biāo)GB/T 2791-1995測(cè)試，被粘物為玻璃紙，此測(cè)試方法主要針對(duì)較軟較薄被粘物。下圖3-6,.表3-4為硫磺用量對(duì)聚氨酯密封膠膠料與玻璃紙間的T型剝離強(qiáng)度的影響。
由以上圖表所示，隨著硫磺用量從1.25降低至0.25，模量隨交聯(lián)密度的減小，聚氨酯密封膠膠料與玻璃紙的T型剝離強(qiáng)度從O.SkN/m增加至0.9kN/m,0.25份硫磺的試樣發(fā)生了內(nèi)聚破壞，由此表明剝離強(qiáng)度極大值存在于0.25份與0.75份硫磺之間，在0.5份左右。
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