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預(yù)聚物與丁基防水嵌縫膠增塑劑相容性測試
- 發(fā)布時間 : 2024-9-5 18:11:40
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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.
預(yù)聚物與丁基防水嵌縫膠增塑劑相容性測試
(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 : 2024-9-5 18:11:40
- Views:
將硅烷改性預(yù)聚物分別與。舊戶、聚醚二元醇、聚醚三元醇、苯甲酸醋丁基防水嵌縫膠增塑劑、丁一50共混后靜置7d,均未出現(xiàn)分層或混濁現(xiàn)象。再將硅烷改性聚醚丁基防水嵌縫膠預(yù)聚物加入催化劑,常溫固化后將固化物分別浸入上述5種丁基防水嵌縫膠增塑劑中7d,對比浸泡前后質(zhì)量變化,并計算質(zhì)量變化率,見表1。
實(shí)驗(yàn)發(fā)現(xiàn),浸在苯甲酸醋丁基防水嵌縫膠增塑劑中的固化物有較為明顯的溶脹,表面有發(fā)粘現(xiàn)象,質(zhì)量變化率最大;在。舊戶和丁一50中浸泡后也有輕微溶脹,質(zhì)量變化率也較大。聚醚多元醇與固化后的預(yù)聚物相容性最差,但由于多元醇的羚基可與預(yù)聚物的烷氧基發(fā)生反應(yīng)從而質(zhì)量稍有上升。
由于在結(jié)晶區(qū)聚合物鏈之間的自由空間很小,丁基防水嵌縫膠增塑劑的分子插入結(jié)晶區(qū)域要比插入無定形區(qū)域困難得多,所以,聚醚多元醇的分子僅能插入部分結(jié)晶的無定形區(qū)域,屬于非溶劑型丁基防水嵌縫膠增塑劑,即輔助丁基防水嵌縫膠增塑劑。DIDP、苯甲酸醋丁基防水嵌縫膠增塑劑、丁一50可同時插入無定形區(qū)和結(jié)晶區(qū),是溶劑型丁基防水嵌縫膠增塑劑,即主丁基防水嵌縫膠增塑劑。
丁基防水嵌縫膠增塑劑對固化性能的影響
在丁基防水嵌縫膠固化過程中,水分由內(nèi)向外的擴(kuò)散速度對丁基防水嵌縫膠的固化深度有直接的影響,而擴(kuò)散速度又受高分子內(nèi)部結(jié)構(gòu)的影響。本實(shí)驗(yàn)對DIDP,聚醚二元醇、聚醚三元醇、苯甲酸醋丁基防水嵌縫膠增塑劑、丁一50對表干時間的影響進(jìn)行試驗(yàn)對比,結(jié)果見圖。
由圖1可見,在加入比例相同的情況下,加入DIDP、苯甲酸醋、丁一50 3種丁基防水嵌縫膠增塑劑的配方表干時間相差不大,約10 min;加入聚醚二元醇的配方表干時間為18min,而加聚醚三元醇配方表干時間最長達(dá)24 min。主要是由于聚醚多元醇的經(jīng)基會消耗掉預(yù)聚物中的烷氧基,從而造成表干時間變長。http://www.ruilingxiang.cn/
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