硅烷改性聚氨酯密封膠與基材的粘結(jié)性能

發(fā)布時(shí)間 : 2025-8-2 15:50:56
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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.

硅烷改性聚氨酯密封膠與基材的粘結(jié)性能

(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 : 2025-8-2 15:50:56
Views:

硅烷改性聚氨酯密封膠的豁結(jié)性能是衡量硅烷改性聚氨酯密封膠的重要技術(shù)指標(biāo)，其對法蘭的使用性能有重要影響，本課題采用內(nèi)聚破化程度和180“剝離強(qiáng)度2個(gè)指標(biāo)來進(jìn)行表征。先將法蘭基材表面用乙醇和丙酮清洗干凈，分別對5種硅烷改性聚氨酯密封膠與基材的勃結(jié)性能進(jìn)行測試，結(jié)果如表2所示。結(jié)果顯示，低溫膠DW-3 ,TV-3428硅膠與冷箱碳鋼材料的赫結(jié)情況相對較好。

5種硅烷改性聚氨酯密封膠與添加底涂劑的基材之間的1800剝離強(qiáng)度如圖3所示。RTV-3428硅膠的剝離強(qiáng)度高于其他硅烷改性聚氨酯密封膠，這是由于RTV-3428硅膠中端烷氧基硅烷可與基材表面經(jīng)基的反應(yīng)且活性較高，并且可生成Si-O-Si的三維網(wǎng)狀結(jié)構(gòu)，從而顯著增強(qiáng)了其與基材之間的赫結(jié)性能。經(jīng)過上述測試發(fā)現(xiàn)，RTV-3428硅膠在流動(dòng)性、固化速率及與基材的赫結(jié)性能方面都優(yōu)于其他硅烷改性聚氨酯密封膠，因此最終選擇RTV-3428硅膠作密封材料。

密封材料配比優(yōu)化，通過測試硅烷改性聚氨酯密封膠的性能，發(fā)現(xiàn)RTV-3428A1B膠(簡稱為A膠、B膠)在流動(dòng)性、固化速率及與基材的豁結(jié)性能方面都優(yōu)于其他硅烷改性聚氨酯密封膠，且RTV 3428為雙組元豁結(jié)材料，通常將它們混合使用，硅烷改性聚氨酯密封膠的力學(xué)性能優(yōu)于單一膠的力學(xué)性能因此，本課題控制A膠、B膠比例，最終得到3種不同配比的混合硅烷改性聚氨酯密封膠，并逐一比對各項(xiàng)性能，進(jìn)而選擇最佳配比的密封材料。力學(xué)性能測試結(jié)果見表。

由表可知，隨A膠含量的增加，A, B硅烷改性聚氨酯密封膠的力學(xué)性能逐漸增加，硅烷改性聚氨酯密封膠2的硬度較好，但耐壓性能、拉伸性能、撕裂強(qiáng)度不及硅烷改性聚氨酯密封膠3，當(dāng)m(A膠):m (B膠)=10:1時(shí)，硅烷改性聚氨酯密封膠的力學(xué)性能達(dá)到最優(yōu):耐壓強(qiáng)度20.14 MPa，拉伸強(qiáng)度7.3 MPa，斷裂伸長率315%，撕裂強(qiáng)度25 N，邵A硬度31。因此，得到硅烷改性聚氨酯密封膠的較佳配比為:m(膠):m(膠)=10:1。http://www.kubee.cn/

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