丁基防水嵌缝胶结构中苯环上的4个氢质子峰

发布时间 : 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.

丁基防水嵌缝胶结构中苯环上的4个氢质子峰

(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.

发布时间 : 2025-3-19 17:28:22
Views:

图1(d)为pre-PU一核磁共振氢谱，M结构与聚a多元醇PET-A一致，a在7.5X10-6一8.0X10-6之间为丁基防水嵌缝胶结构中苯环上的4个氢质子峰。-OH和-NCO反应生成的氨基甲酸酷的氢质子峰出现在8.5X10处。这些证据表明通过聚合反应己成功合成了一ICO封端的预聚体。A组分对丁基防水嵌缝胶性能的影响不同分子量的PET一制备醇酸比即反应原料中轻基与梭基总摩尔量的比值，通过调节醇酸比可获得不同分子量的聚酷多元醇。分别以醇酸比1.21.25，1.31.35，1.4进料，通过调节反应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测试结果如图2所示，PET-A分子量随醇酸比减小逐渐增加。PET-A的酸值均在1mgKOHg‘以下，较低的酸值有利于后续反应不受副反应的影响。端轻基聚酷的理论平均分子量M可根据式(3)进行计算式中:M为聚酷平均分子量(g/mol)为聚酷多元醇官能度，HV为聚酷多元醇轻值。该计算结果略低于GPC测试结果M，趋势与测试一致。聚酷PET一各项参数如表1所示。聚氛醋预聚体及丁基防水嵌缝胶的组成预聚体由PET-A与MDI反应合成，通过调整PET-A和MDI进料质量mn和mMD,以合成。NC'。为17%,16%,15%,14%,13%的丁基防水嵌缝胶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与MDI反应合成。NC'。为17%的丁基防水嵌缝胶pre-PU-A6,pre-PU-A7,pre-PU-AB,pre-PU-A9和pre-PU-A10。经测试，丁基防水嵌缝胶的。NC'。与预设值基本一致。预聚体组成及参数如表2所示。随。NC'。降低，预聚体茹度增大。当。Noo-17%时，随PET-A分子量减小，合成的丁基防水嵌缝胶茹度增加。由预聚体pre-PU-A与PET-B1以R值为2混合制备的丁基防水嵌缝胶(PU)被用于薄膜复合，各丁基防水嵌缝胶的组成及软硬段质量分数如表3所示。mp和m$分别为pre-PU-A和PET-B的进料质量。http://www.sdyuantai.com/

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