低表面能防污涂料的最新进展

本文从理论上分析了低表面能防污涂料 (主要为氟碳树脂防污涂料及有机硅弹性体防污涂料 )防污性能的影响因素 ,并综述了低表面能防污涂料的设计准则及最新进展     

不同氟含量的苯丙树脂及防污涂料的性能研究

采用具有低表面能特性的有机氟单体对苯丙树脂进行改性合成,探讨了氟单体用量及软硬单体比例对树脂性能的影响,用接触角检测仪对涂膜表面与水的接触角进行了测量,并对涂膜的附着力、冲击强度等各项常规性能进行了综合检测,同时进行了实海挂板试验。结果表明,当氟单体含量为17.3%、软硬单体比值为0.46时,树脂性能较好,对应的防污涂料防污性能也最佳。此时涂料涂膜与水的接触角是145.5°,附着力等级1级,在50cm垂直高度下重锤冲击无裂纹。     

无毒型低表面能海洋防污涂料的研制

为研制符合环保要求的无毒防污涂料,通过氟碳树脂与丙烯酸树脂的物理共混改性,探讨了两种树脂的最佳配比参数;同时通过更改颜料体积浓度(PVC)参数进行试验对比,分析了涂料中颜填料不同组分的变动对涂膜表面能及耐腐蚀等性能的影响,并最终确定涂料配方,制备出了无毒型低表面能海洋防污涂料.     

硅氧烷接枝改性丙烯酸树脂的合成及应用

以多种丙烯酸酯类单体为原料合成羟基丙烯酸树脂,将硅酸乙酯部分水解缩聚制备聚硅氧烷,用硅氧烷对丙烯酸树脂接枝改性,制备出以丙烯酸树脂为主链、以具有水解特性及低表面能的有机硅为侧链的接枝共聚物,以此共聚物为基料,制备自抛光及低表面能复合型防污涂料.采用红外光谱、热重分析对接枝共聚物进行了表征,并测算了共聚物及制备的防污涂料涂膜的表面能.结果表明,合成的接枝共聚物与设计结构相符,其表面能达到23.63 mN/m,可用于防止海生物附着的防污涂料.     

氨基硅油改性丙烯酸树脂防污涂料的制备与性能

环境友好型有机硅改性丙烯酸树脂的合成及其用于海洋防污涂料的性能研究很有意义。以氨基硅油为原料,通过开环加成改性甲基丙烯酸缩水甘油酯(GMA),再与其他丙烯酸单体自由基聚合制备出氨基硅油改性丙烯酸树脂,借助FT-IR对其结构进行了表征,并以改性丙烯酸树脂为防污涂料成膜物制备了兼具自抛光特性/低表面能特性的防污涂料,考察了氨基硅油用量对涂料涂膜的附着力、柔韧性、接触角和表面能等的影响。结果表明:当氨基硅油用量为1%时,涂膜综合性能达到最佳,附着力、柔韧性达到一级,抗冲击强度≥50 kg·cm,硬度达到2 H,接触角为99.6°,表面能为23.3 m N/m;结合实海挂板试验显示,改性的防污涂料具有良好的防污性能。     

海洋船舶有机硅低表面能防污涂料的研究进展

海洋防污涂料是海洋工程与装备的重要防护材料,对于海洋资源开发利用发挥着极其重要的作用。在现用的海洋防污涂料中,低表面能防污涂料不会对海洋环境产生破坏,是将来的主要发展方向。本文简要介绍了低表面能防污涂料的机理及影响因素,重点论述了有机硅改性不同有机树脂的防污涂料、纳米材料改性有机硅防污涂料和有机硅仿生复合防污体系的技术发展现状,并展望了未来低表面能船舶防污涂料的发展方向。     

环保型防污涂料研究进展

简要介绍了防污涂料中的有毒防污剂和VOC对人体和环境的危害,以及一些国家的应对策略。从防污剂的无毒化、低表面自由能树脂、导电防污涂料、低VOC防污涂料等方面综述了环保型防污涂料研究和开发取得的进展。并提出了需要对导电防污涂料和低VOC防污涂料进一步加强研究的建议。     

纳米SiO_2/改性丙烯酸树脂低表面能防污涂料

低表面能防污涂料是船舶涂料的一个重要分支。利用有机硅改性的丙烯酸树脂作为成膜物质,纳米SiO2为填料,制备了低表面能纳米复合防污涂料。考察了有机硅单体对改性丙烯酸树脂性能的影响,发现随着有机硅含量的增加,改性后的树脂粘度减小,水接触角增加。研究了氟硅烷改性纳米SiO2含量对涂层形貌和水接触角的影响。结果表明,添加少量的氟硅烷处理的纳米SiO2(1%和3%)可显著增大涂层的水接触角,提高涂层的防污性能。添加纳米SiO2浆的涂层的水接触角要高于添加接枝氟硅烷纳米SiO2的涂层,而后者要高于添加未接枝氟硅烷纳米SiO2的涂层。当纳米SiO2的添加量在1%和3%时,涂层的水接触角分别达到101.8°和103°。采用纳米浓缩浆工艺分散后的纳米SiO2可以使涂层的表面形成微米-纳米的特征形貌,从而实现防污的目的。     

含氟丙烯酸硅酯自抛光防污涂料的研制

制备了既具有低表面能性能又具有自抛光性能的含氟丙烯酸硅酯树脂,讨论了含氟丙烯酸单体用量对树脂水解性能的影响,并对树脂结构进行了表征;采用制备的含氟丙烯酸硅酯树脂制备了无锡环保型自抛光防污涂料,并对其性能进行了研究,结果表明该自抛光防污涂料具有良好的防污性能。     

低表面能防污涂料的最新研究进展

低表面能防污涂料(有机硅系列和氟化物系列)因具有独特的性能而在许多领域得到广泛应用.介绍了低表面能防污涂料防污的作用机理、特点,综述了低表面能防污涂料的应用和最新进展,并阐述了低表面能防污涂料有待解决的问题和今后的发展方向.     

BA—MMA—GMTS三元共聚大分子表面处理剂的合成及其对高岭土／PVC复合电缆料的改性

采用溶液聚合法合成了BA-MMA-GMTS三元共聚物大分子表面处理剂，应用该大分子表面处理剂对纳米级煅烧高岭土进行表面处理，FTIR表明共聚物包覆了高岭土，TEM观察到处理后高岭土在有机溶剂中的分散良好。DMTA测试显示，用其处理的纳米级高岭土填充制备PVC电缆料的取和Tg转变温区明显降低和拓宽。SEM对该PVC电缆料低温冲击断裂面的观察显示是韧性断裂。检测结果表明用大分子表面处理剂包覆的纳米级煅烧高岭土填充制备的PVC电缆料低温冲击韧性、力学性能和电举性能均最佳。     

Study on the interface of phenolic resin/expanded graphite composites prepared via in situ polymerization

Phenolic resin/expanded graphite (EG) composites were synthesized via in situ condensation polymerization of the monomers in the presence of foliated graphite. SEM observation showed that the graphite flakes were well dispersed in the phenolic resin matrix. The electrical conductivity of the composites was investigated as a function of the foliated graphite fraction. The composites containing graphite sheets exhibited an electrical conductivity percolation threshold with 3.2 wt% graphite content in polymer matrix. Inverse gas chromatography (IGC) measurements were carried out to characterize the surface of the foliated graphite before and after condensation polymerization of phenolic resin using a series of both non-polar and polar acid–base probe gases. The data obtained indicated that the character of graphite surface changed after the polymerization of phenolic resin. The dispersive component of surface free energy decreased greatly. Before polymerization the graphite surface is predominantly acidic while the surface turns to basic after polymerization. The increased polarity of surface contributed to the stronger interactions between graphite and phenolic resin and the fine dispersion of expanded graphite in the matrix, and resulted in the low conductivity percolation threshold.     

酚醛树脂空心微球的研究及应用进展

从酚醛微球制备的角度总结了近年来国内外制备酚醛树脂闭孔中空微球的各种方法,包括喷雾干燥法、发泡法、悬浮聚合法以及微胶囊法等,并简要介绍了酚醛树脂微球的性能及应用研究,结合目前的研究与应用现状、差距和问题对该领域的发展趋势进行了展望.     

环氧酚醛树脂基磁性复合材料的性能研究

用原位聚合法制备环氧酚醛树脂母料,进而通过模压成型方法制备树脂基钕铁硼(NdFeB)磁性复合材料.用红外光谱分析了环氧酚醛/NdFeB母料的结构,分析了原位聚合树脂的接枝机理.通过SEM研究了试样的缺口冲击断面形貌,对样品的表面形貌进行了分析.并用对比方法分析了复合型树脂的优点所在.     

高能量超声波改性MWCNTs/环氧树脂特性分析

采用高能量超声波与低能量超声波对一种多壁碳纳米管(MWCNTs)/环氧树脂体系进行改性处理,结合流变仪、DSC、FTIR、XPS、XRD、TEM等测试手段,分析了不同超声波处理条件下MWCNTs物理化学特性的变化及其对MWCNTs在环氧树脂中的分散性和相容性的影响,并进一步考察了MWCNTs/环氧树脂体系的耐热性和弯曲性能。实验结果表明:超声波能量不同,MWCNTs的改性效果不同,高能量超声波对MWCNTs有更好的分散效果和分散效率,并能使MWCNTs表面活性增强,而低能量超声波则不明显;添加少量高能量超声波改性的MWCNTs,可以提高环氧树脂的弯曲模量和玻璃化转变温度,表明MWCNTs与基体之间形成了较强的结合界面。     

聚丙烯酸钠高吸水性树脂的性能改善

采用水溶液聚合的方法合成了聚丙烯酸钠阴离子型高吸水性树脂 ,并通过改变聚合过程中的添加剂和对吸水性聚合物进行表面交联反应处理 ,对产品性能进行了研究。结果表明 :在聚合过程中添加适当的添加剂和对产品进行表面交联反应处理 ,能显著地改善产品性能     

微胶囊技术及其在固化环氧体系中的应用

阐述了微胶囊表面形态、粒度、厚度、包埋率、机械强度、渗透性、热稳定性能等的检验方法与表征,介绍了界面聚合法、原位聚合法和溶剂蒸发法3种固化剂或促进剂的微胶囊化技术,综述了微胶囊技术在固化环氧体系中的应用,并展望了其发展前景。     

Polybutylacrylate/poly(methyl methacrylate) Core-Shell Elastic Particles as Epoxy Resin Toughener: Part I Design and Preparation

Polybutylacrylate (PBA)/poly(methyl methacrylate) (PMMA) core-shell elastic particles (CSEP), whose rubbery core diameter ranged from 0.08 μm to 1.38μm, were synthesized by using conventional emulsion polymerization, multi-step emulsion polymerization, and soapless polymerization. Allyl methacylate (ALMA) and ethylene glycol dimethacrylate (EGDMA) were selected as crosslinking reagents for core polymerization. Methacrylic acid (MAA) was used as functional co-monomer with methyl methacrylate as shell component. The content of vinyl groups in PBA rubbery core increased with the amount of crosslinking reagents. The core-shell ratio affected great on the morphology of the complex particles. Furthermore, the amounts of carboxyl on the surface of core-shell particles, copolymerized with acrylic acid, were determined by potentiometric titration. Results showed that methylacrylic acid was distributed mostly on the surface of particles.     

Polybutylacrylate/poly(methyl methacrylate) Core-Shell Elastic Particles as Epoxy Resin Toughener:Part Ⅰ Design and Preparation

Polybutylacrylate (PBA)/poly(methyl methacrylate) (PM MA) core-shell elastic particles (CSEP), whose rubbery core diameterranged from 0.08 μm to 1.38 μm, were synthesized by using conventional emulsion polymerization, multi-step emulsion polymerization, and soapless polymerization. Allyl methacylate (ALMA) and ethylene glycol dimethacrylate (EGDMA) were selected as crosslinking reagents for core polymerization. Methacrylic acid (MAA) was used as functional co-monomer with methyl methacrylate as shell component. The content of vinyl groups in PBA rubbery core increased with the amount of crosslinking reagents. The core-shell ratio affected great on the morphology of the complex particles. Furthermore, the amounts of carboxyl on the surface of core-shell particles, copolymerized with acrylic acid, were determined by potentiometric titration. Results showed that methylacrylic acid was distributed mostly on the surface of particles.