聚氨醋改性后的單組分聚氨酯密封膠的低溫性...
2026-01-15
推薦新聞
生物基非異氰酸醋硅烷改性聚氨酯密封膠
- 發(fā)布時(shí)間 : 2025-12-10 12:55:38
- Views:
(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.
生物基非異氰酸醋硅烷改性聚氨酯密封膠
(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 : 2025-12-10 12:55:38
- Views:
Information
將包含異山梨醇在內(nèi)的生物基二元醇與生物基二元酸通過(guò)縮聚反應(yīng)制備聚醋多元醇，并利用這種含有異山梨醇的聚醋多元醇與異氰酸醋反應(yīng)制備生物基硅烷改性聚氨酯密封膠。此類硅烷改性聚氨酯密封膠具備粘接強(qiáng)度高、韌性佳、開放時(shí)間長(zhǎng)等優(yōu)點(diǎn)。
目前尋找石油基硅烷改性聚氨酯密封膠的生物基替代品大多聚焦于開發(fā)生物基多元醇上，另一主要原料異氰酸醋也有生物基品種被研發(fā)，主要是從天然原料如植物油和脂肪酸合成多種生物基異氰酸醋，例如賴氨酸二異氰酸醋和三異氰酸醋、五亞甲基二異氰酸醋、六亞甲基二異氰酸醋( HDI )、二聚酸二異氰酸醋等。
利用生物基HDI(牌號(hào)Tolonate XFLO 100)與蓖麻油基多元醇在雙酸二丁基錫催化下，分別以NCO/OH摩爾比1.1/1,1.3/1和1.5/1制備了生物基硅烷改性聚氨酯密封膠。實(shí)驗(yàn)結(jié)果表明，NCO/OH摩爾比為1.3/1時(shí)，該硅烷改性聚氨酯密封膠對(duì)木材的搭接剪切強(qiáng)度最佳(4.0 MPa)，且為市售硅烷改性聚氨酯密封膠剪切強(qiáng)度的2-4倍。此外，該硅烷改性聚氨酯密封膠具有優(yōu)異的耐酸性和耐熱性，可以用于粘接木質(zhì)基材。
某些硅烷改性聚氨酯密封膠中會(huì)有少量的揮發(fā)性二異氰酸醋單體殘留，有些人即使接觸低濃度的異氰酸醋也會(huì)引起哮喘、皮炎等嚴(yán)重問(wèn)題。避免使用異氰酸醋可從根本上解決其殘留的問(wèn)題。因此，利用雙環(huán)碳酸醋和二胺合成非異氰酸醋聚氨醋已經(jīng)變成用于生產(chǎn)生物基聚氨醋最新的合成途徑。
用木質(zhì)素和季鉸鹽合成了一種液態(tài)中間體，加入環(huán)氧大豆油，隨后在反應(yīng)釜中通入二氧化碳，在低溫低壓條件下合成了木質(zhì)素改性的環(huán)狀碳酸醋。通過(guò)改性，增加了環(huán)狀碳酸醋的經(jīng)基含量，提升了活性位點(diǎn)數(shù)量并引入苯環(huán)，從而提高了硅烷改性聚氨酯密封膠的交聯(lián)程度、粘接強(qiáng)度、機(jī)械強(qiáng)度和耐熱性。具體實(shí)驗(yàn)中，木質(zhì)素改性的環(huán)狀碳酸醋和異佛爾酮二胺，在室溫下攪拌混勻，分別涂抹在樺木板、鋁板和不銹鋼板上。隨后，在120℃烘箱中固化36h，分別獲得了20.5 ,12.5和17.9 MPa的拉伸剪切強(qiáng)度，材料表現(xiàn)出優(yōu)異的力學(xué)性能。http://www.kzgjfl.cn/
Scan the QR code to read on your phone
上一篇: 木質(zhì)纖維素基的丁基防水嵌縫膠
上一篇: 木質(zhì)纖維素基的丁基防水嵌縫膠
+86-
13573398725
sdyuantai@163.com
搜索