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單組分聚氨酯密封膠的耐老化性能和流黑水情況
- 發(fā)布時間 : 2025-12-20 12:15:20
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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.
單組分聚氨酯密封膠的耐老化性能和流黑水情況
(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 : 2025-12-20 12:15:20
- Views:
單組分聚氨酯密封膠具有彈性好、機械強度大、粘接性好以及耐磨性、耐油性、耐生物老化性和耐低溫性優(yōu)異等特點,是國內(nèi)外汽車擋風(fēng)玻璃粘接及車體密封的最佳用膠。但單組分聚氨酯密封膠也存在耐熱性、耐候性差等問題,淺色單組分聚氨酯密封膠經(jīng)紫外光老化易變色,而用于汽車玻璃與窗框之間密封的外嵌縫用黑色單組分聚氨酯密封膠在夏季光線強烈、高溫高濕季節(jié)使用一段時間后,下雨或洗車時會有黑色物質(zhì)隨水流下污染車體,俗稱“流黑水”現(xiàn)象。
針對以上問題,本工作對單組分聚氨酯密封膠的耐老化性能和流黑水情況做了深人地分析研究和表征。單組分聚氨酯密封膠的制備在制膠機中加人增塑劑、預(yù)聚體,真空條件下攪拌均勻;然后加人已預(yù)干燥的填料,充分攪拌后加人適量的催化劑等助劑,分散均勻后,出料裝人鋁管或鋁塑復(fù)合膜包裝管中得成品。將單組分聚氨酯密封膠涂成2mm厚膠片放置在(23士2)℃、(50士5)%RH條件固化7d,進行耐老化試驗。
單組分聚氨酯密封膠耐老化性能主要參照HG/T4363-2012中車窗玻璃嵌縫密封用111型單組分聚氨酯密封膠的標準進行,老化后樣品拉伸強度、斷裂伸長率須滿足變化率士30%的要求。拉伸強度和斷裂伸長率參照GB/T528-2009進行測定,拉伸速度(200士20)mm/min,計算出老化前后的變化率。本研究中的6種老化方式包括紫外光老化、兩種條件的熱老化(120℃,3h和90℃,300h)、濕熱老(70℃,95%RH,300h)、水老化(40℃泡水72h)和戶外自然老化。其中戶外自然老化是將單組分聚氨酯密封膠涂于房頂鐵皮上固化,膠層厚度2-3mm,在無遮擋情況下,7-8月份放置30d后考察表面老化和本體拉伸性能變化情況。“流黑水”嚴格說是固化后單組分聚氨酯密封膠經(jīng)歷老化后的表面掉黑粉現(xiàn)象,屬于一種表面老化。行業(yè)內(nèi)通常采用膠帶法表征,即將紙膠帶緊貼在老化后的膠片表面,揭下后觀察膠帶表面黑粉污染情況,以此判定流黑水情況的輕重。汽車主機廠一般要求施膠后6個月不流黑水。http://www.kzgjfl.cn/
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