一種新超低模量硅酮密封膠制備及性能研究

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關鍵詞：硅酮密封膠、低模量、擴鏈劑、助劑復配、 .150% 定伸彈性恢復率中圖分類號： TQ436+ .6 文獻標志碼：A 文章編號：1001-5922（2025）07-0017-04

Abstract：An ultra-low modulus room-temperature vulcanized silicone sealant was prepared with hydroxyl polydimethylsiloxane（1O7 glue）as the base glue，calciumcarbonateasthereinforcing filer，siliconeoil，additives andcatalysts.The efectsof high viscosityand lowviscosity107base adhesivecompounding，thedoping ratioof heavycalciumand nanocalcium carbonate，the combinationof crosslinker and chain extender，and thecombinationof difrent coupling agents on the performance of sealant were studied. The results showed that when 2O OOO mPa ·s107 glue： 500000mPa?s107glue=7：3 ，heavy calcium： nano calcium carbonate and silicone oil addition of 5O phr，the modulusof the sealant was lower and had beter fluidity，which is conducive to construction. When crosslinker： PC7200=3：1 and were compounded，the modulus of the final prepared silicone sealant was （204 0.08MPa，150% fixed-elongation elastic recovery rate was 96% ，and elongation at break was 1 250% ，which can be used for caulking sealing of airport runways and highways in extreme climate areas.

Key words： silicone sealant;low modulus;chain extender；additives compounding; 150% fixed-stretch elastic recoveryrate

室溫硫化硅橡膠在濕氣環(huán)境中通過107基膠和交聯劑交聯固化形成獨特的—Si—O—Si—空間結構，與其他密封膠相比，硅橡膠具有優(yōu)異的耐侯性，酸堿穩(wěn)定性高，耐化學腐蝕性，較寬的環(huán)境使用溫度，對基材的粘接廣泛性好，從而在建筑工業(yè)、電子行業(yè)、橡膠模具、航空航天、汽車船舶、醫(yī)藥紡織等領域有著突出表現[14]

室溫硫化硅橡膠按 100% 定伸應力的大小可分為低模量硅橡膠、中模量硅橡膠以及高模量硅橡膠[5]，其中高模量硅橡膠硬度高、力學強度好，主要用于基材之間的結構粘接；低模量硅橡膠硬度低、柔韌性好、伸長率高，主要用于存在大形變量基材的粘接密封。（剩余4632字）