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硅烷改性聚氨酯密封膠本體性能測(cè)試結(jié)果及分析
- 發(fā)布時(shí)間 : 2026-7-10 10:28:15
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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本體性能測(cè)試結(jié)果及分析
(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 : 2026-7-10 10:28:15
- Views:
硅烷改性聚氨酯密封膠與基材粘附性能測(cè)試
硅烷改性聚氨酯密封膠與基材間的粘附性試驗(yàn),主要通過(guò)不同基材表面(陽(yáng)極氧化鋁合金、環(huán)氧底漆碳鋼),結(jié)合2種不同的制樣及固化環(huán)境條件進(jìn)行組合,試驗(yàn)采用膠條剝離測(cè)試的方法進(jìn)行評(píng)估,按照ISO 21194-2019《彈性膠粘劑粘接接頭試驗(yàn)?zāi)z條剝離測(cè)試》的標(biāo)準(zhǔn)要求進(jìn)行膠條剝離測(cè)試,紫外老化測(cè)試按照GB/T 16422.3-2022要求進(jìn)行。
試樣在經(jīng)歷膠條剝離老化及紫外老化的各階段后分別進(jìn)行測(cè)試,根據(jù)膠條剝離后的破壞模式和等級(jí),評(píng)價(jià)密封劑與基材間的粘附及密封性能。
硅烷改性聚氨酯密封膠抗疲勞性能測(cè)試
模擬車(chē)體振動(dòng),對(duì)密封接縫試樣進(jìn)行定頻不同應(yīng)力的往復(fù)拉伸一壓縮剪切疲勞測(cè)試;疲勞試驗(yàn)條件:固定頻率為7 Hz,施加在試樣上的最大載荷分別為187,172,156,150及140 N的5種應(yīng)力水平,并通過(guò)控制應(yīng)力比為R=0.1來(lái)實(shí)現(xiàn)不同的振幅變化,記錄其出現(xiàn)裂紋或粘接失效的循環(huán)次數(shù)。
硅烷改性聚氨酯密封膠本體性能測(cè)試結(jié)果
硅烷改性聚氨酯密封膠的本體拉伸強(qiáng)度、斷裂伸長(zhǎng)率及邵A硬度等參數(shù)與高低溫濕熱及紫外老化暴露時(shí)間有著密切的關(guān)系,根據(jù)實(shí)測(cè)數(shù)據(jù)繪制了各階段老化后性能變化曲線(xiàn),如圖3一圖4所示。
硅烷改性聚氨酯密封膠本體性能測(cè)試結(jié)果分析
首先從拉伸強(qiáng)度看,初始強(qiáng)度為3.15 MPa,隨著不同老化階段以及老化時(shí)間延長(zhǎng),拉伸強(qiáng)度逐漸下降;在濕熱老化階段的8周內(nèi),強(qiáng)度從3.15 MPa降至2.89 MPa,下降幅度約8.3%;而到了紫外老化階段,強(qiáng)度從2.81 MPa緩慢降至2.69 MPa,降幅約為4.3%,此階段下降幅度顯著小于濕熱老化階段;MS硅烷改性聚氨酯密封膠在整個(gè)老化階段強(qiáng)度性能下降了14.6%,小于硅烷改性聚氨酯密封膠老化后性能變化率20%,符合評(píng)價(jià)要求,且下降趨勢(shì)逐漸趨緩。整體性能的變化可能的原因是在老化過(guò)程中發(fā)生了一定程度的降解,在濕熱老化階段分子鏈斷裂與交聯(lián)反應(yīng)均處于活躍的狀態(tài),而隨著老化進(jìn)程的疊加,到了紫外老化階段,此時(shí)的分子鏈中易損組分的耗盡、表面致密層的形成以及氧氣擴(kuò)散受限,老化的驅(qū)動(dòng)力矩速率都顯著降低,宏觀的強(qiáng)度性能的變化因而趨于平緩,降幅較小。http://www.mychangxin.com/
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