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丁基防水嵌縫膠結(jié)構(gòu)中苯環(huán)上的4個(gè)氫質(zhì)子峰
- 發(fā)布時(shí)間 : 2025-3-19 17:28:22
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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.
丁基防水嵌縫膠結(jié)構(gòu)中苯環(huán)上的4個(gè)氫質(zhì)子峰
(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 : 2025-3-19 17:28:22
- Views:
圖1(d)為pre-PU一核磁共振氫譜,M結(jié)構(gòu)與聚a多元醇PET-A一致,a在7.5X10-6一8.0X10-6之間為丁基防水嵌縫膠結(jié)構(gòu)中苯環(huán)上的4個(gè)氫質(zhì)子峰。-OH和-NCO反應(yīng)生成的氨基甲酸酷的氫質(zhì)子峰出現(xiàn)在8.5X10處。這些證據(jù)表明通過(guò)聚合反應(yīng)己成功合成了一ICO封端的預(yù)聚體。A組分對(duì)丁基防水嵌縫膠性能的影響不同分子量的PET一制備醇酸比即反應(yīng)原料中輕基與梭基總摩爾量的比值,通過(guò)調(diào)節(jié)醇酸比可獲得不同分子量的聚酷多元醇。分別以醇酸比1.21.25,1.31.35,1.4進(jìn)料,通過(guò)調(diào)節(jié)反應(yīng)真空度合成分子量不同的聚酷多元醇PET-A1,PET-A2,PET-A3,PET-A4,PET-ASoGPC測(cè)試結(jié)果如圖2所示,PET-A分子量隨醇酸比減小逐漸增加。PET-A的酸值均在1mgKOHg‘以下,較低的酸值有利于后續(xù)反應(yīng)不受副反應(yīng)的影響。端輕基聚酷的理論平均分子量M可根據(jù)式(3)進(jìn)行計(jì)算式中:M為聚酷平均分子量(g/mol)為聚酷多元醇官能度,HV為聚酷多元醇輕值。該計(jì)算結(jié)果略低于GPC測(cè)試結(jié)果M,趨勢(shì)與測(cè)試一致。聚酷PET一各項(xiàng)參數(shù)如表1所示。聚氛醋預(yù)聚體及丁基防水嵌縫膠的組成預(yù)聚體由PET-A與MDI反應(yīng)合成,通過(guò)調(diào)整PET-A和MDI進(jìn)料質(zhì)量mn和mMD,以合成。NC'。為17%,16%,15%,14%,13%的丁基防水嵌縫膠pre-PU-Al,pre-PU-A2,pre-PU-A3,pre-PU-A4,pre-PU-AS。不同分子量的聚酷PET-A1,PET-A2,PET-A3,PET-A4,PET-AS與MDI反應(yīng)合成。NC'。為17%的丁基防水嵌縫膠pre-PU-A6,pre-PU-A7,pre-PU-AB,pre-PU-A9和pre-PU-A10。經(jīng)測(cè)試,丁基防水嵌縫膠的。NC'。與預(yù)設(shè)值基本一致。預(yù)聚體組成及參數(shù)如表2所示。隨。NC'。降低,預(yù)聚體茹度增大。當(dāng)。Noo-17%時(shí),隨PET-A分子量減小,合成的丁基防水嵌縫膠茹度增加。由預(yù)聚體pre-PU-A與PET-B1以R值為2混合制備的丁基防水嵌縫膠(PU)被用于薄膜復(fù)合,各丁基防水嵌縫膠的組成及軟硬段質(zhì)量分?jǐn)?shù)如表3所示。mp和m$分別為pre-PU-A和PET-B的進(jìn)料質(zhì)量。http://ago-games.com/
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