环境友好型水性涂料复合膜防腐性能的研究

通过在线检测硅烷的水解程度,确定了KH-560硅烷偶联剂的最佳耐腐蚀浓度,利用水解硅烷在钢铁基材表面成膜再与水性涂料复合成膜,提高金属表面的防腐作用。研究发现复合膜比水性聚丙烯酸酯乳液膜涂层的耐腐蚀性能提高4~5倍,是未经处理裸铁的288倍左右,并促进了水性涂层附着力。     

附着力促进剂对铝阴极板表面环氧涂层性能的影响

为了探究附着力促进剂对铝阴极板表面环氧涂层性能的影响,本文通过拉拔实验、盐雾实验、硫酸锌浸泡实验以及交流阻抗测试,系统研究了磷酸酯类和硅烷偶联剂类附着力促进剂对环氧涂层附着力和耐腐蚀性的影响。结果表明：附着力促进剂可以明显提升环氧涂层和铝基材的结合力,添加 3%附着力促进剂 2063的涂层附着力最优,可以达到 12. 85 MPa,破坏类型以层间破坏为主;但是交流阻抗图谱显示其低频区的阻抗值比附着力促进剂 4512的低 2个数量级,通过盐雾实验和硫酸锌浸泡实验也可以看出附着力促进剂 4512可以显著提升环氧涂层的耐腐蚀性能。为平衡涂层附着力和耐腐蚀性能,通过将附着力促进剂 2063与 4512按质量比 2∶1进行复配,其附着力和耐腐蚀性可以满足要求,附着力可以达到 14. 4 MPa。     

硅烷偶联剂在有机防腐涂料改性中的应用

金属表面涂刷有机涂层是一种操作简单、适用范围广而防护效果好的防止金属腐蚀的方法。然而金属基材与涂料间低的附着力往往会导致涂层脱落而使防护效果大大减弱。有机硅烷分子因其特殊的"分子桥"结构,可作为偶联剂掺杂到有机涂料中对涂料进行改性,增强有机涂料对金属基材的附着力从而大大提高其防护性能。本文重点介绍了硅烷偶联剂的结构特点和其在有机防腐涂料改性机理、改性方法及改性工艺参数等方面的研究。     

环氧厚涂层涂料

通过选择合适的环氧树脂、填料、溶剂等制备了环氧厚涂层涂料，对比了不同添加量的液态聚硫橡胶对环氧厚涂层的附着力、柔韧性以及工艺的影响。实验表明：当环氧厚涂层涂料中添加20％的液态聚硫橡胶时，可在满足涂料施工工艺性要求的前提下，使涂层的附着力、柔韧性以及耐温性能明显提高。     

环氧粉末涂层对金属基材附着力的影响因素

环氧粉末涂料具有附着力好、耐腐蚀性强、耐温性能好等优点,在金属防腐特别是重防腐领域应用非常广泛。在环氧粉末涂层的诸多性能中,涂层对基材的附着力是非常重要的一项技术指标,也是满足其他性能的基础,附着力的好坏直接影响着涂层对基材的保护寿命。本文主要从喷涂温度、基材表面处理的表面粗糙度以及粉末涂料原材料等方面讨论了环氧涂层对金属基材表面附着力的影响因素。研究表明：喷涂温度提高有利于涂层附着力的提高,表面粗糙度提高且锚纹深度相对均匀有利于涂层附着力的提高,填料以及助剂的种类对附着力具有一定的影响。     

镀锌基材用改性环氧涂料的研究

采用环氧树脂与氯醚树脂物理复配的方法,选用合适的环氧固化剂,制得一种可用于镀锌基材的改性环氧涂料。研究了不同型号的环氧树脂与氯醚树脂物理复配比例对改性环氧涂料性能的影响,以及改性环氧涂料涂膜在镀锌基材上的柔韧性、层间配套性、附着力等性能。制得的改性环氧涂料涂膜在镀锌基材表面的柔韧性、层间配套性、附着力等性能较常规环氧涂料有明显提高,能够满足镀锌基材的防护要求。     

卷材涂料用环氧磷酸酯附着力促进剂的制备及其性能研究

研制了卷材涂料用环氧磷酸酯附着力促进剂,重点探讨了反应温度、反应时间以及磷酸添加量对环氧磷酸酯化反应的影响;并将其作为附着力促进剂直接添加在卷材底漆中,考察了添加量对卷材底漆及配套面漆体系的漆膜附着力、耐盐雾性能的影响。结果表明：当磷酸与环氧基的物质的量比为 1∶1,环氧磷酸酯化在 125 ℃反应 2h时所得产物的综合性能较优;当环氧磷酸酯在卷材底漆的添加量（质量分数）为 1.5%~2%时,整个涂层体系的附着力和耐腐蚀性能达到最佳。     

富锌环氧涂层的防腐蚀研究

通过对研究磷铁粉，硅烷偶联剂处理金属基体对富锌环氧涂层的影响，制备出在金属基体上具有良好附着力和防锈力的富锌环氧涂层，并研究了富锌环氧涂层的防蚀机理及硅烷偶联剂的作用机理。     

激光和等离子体处理对复合材料表面涂层附着力的影响研究

为了提高环氧涂料在纤维增强聚丙烯复合材料上的附着力,采用激光和等离子体表面前处理方法,应用超景深显微镜、粗糙度测定仪、接触角测试仪以及附着力测试仪,研究了激光和等离子体表面处理对纤维增强聚丙烯复合材料表面形貌、表面粗糙度和表面水接触角的影响,并且探究了这2种表面处理方式对环氧涂层在复合材料上附着力的影响。结果表明:2种处理方式均可明显提高环氧涂层在基材上的附着力,附着力均可由不到1 MPa提高至8 MPa以上。     

激光和等离子处理对复合材料表面涂层附着力的影响研究

为了提高环氧涂料在纤维增强聚丙烯复合材料上的附着力,采用激光和等离子体表面前处理方法,应用超景深显微镜、粗糙度测定仪、接触角测试仪以及附着力测试仪,研究了激光和等离子体表面处理对纤维增强聚丙烯复合材料表面形貌、表面粗糙度和表面水接触角的影响,并且探究了这 2种表面处理方式对环氧涂层在复合材料上附着力的影响。结果表明： 2种处理方式均可明显提高环氧涂层在基材上的附着力,附着力均可由不到 1 MPa提高至 8 MPa以上。     

短氟碳链含氟硅烷偶联剂及其疏水涂层的构建

以三氟丙基甲基环三硅氧烷(D3F)、二甲基氯硅烷、甲基二氯硅烷、乙烯基三甲氧基硅烷(VTMS)为主要原料,通过阴离子开环聚合和硅氢加成反应合成了一系列短氟碳链含氟硅烷偶联剂。载玻片表面经纳米二氧化硅溶胶涂膜和硅烷偶联剂表面修饰得到疏水涂层。探究了不同硅烷偶联剂对于涂层疏水性、附着力、硬度、透过率等性能的影响。结果表明,同类型含氟硅烷偶联剂中氟含量越大,其修饰的涂层接触角越大;相似相对分子质量及氟含量情况下,直链型含氟硅烷偶联剂修饰的涂层疏水性优于支链型修饰的涂层。经含氟硅烷偶联剂修饰的疏水涂层中,接触角最大的是由聚合度为9的支链型含氟硅烷偶联剂(DF3)修饰的涂层,可达141.6°。疏水涂层的附着力均达1级,硬度均达H,可见光透过率高于82.9%,具有良好的自清洁性能。     

六钛酸钾晶须基隔热卷材涂料的制备与性能

用硅烷偶联剂对六钛酸钾晶须进行表面处理,再加入到饱和聚酯卷材涂料中以期得到隔热性能优良的隔热卷材涂料.考察了硅烷偶联剂用量、水解条件及六钛酸钾晶须用量对卷材涂料隔热性能的影响.采用SEM分析对涂膜表面六钛酸钾晶须分散状态进行了分析表征.结果表明,硅烷偶联剂表面处理能够实现六钛酸钾晶须在涂膜中的均匀分散,最优的处理工艺为...     

氟硅橡胶的硅烷偶联剂与粘接性能

根据氟硅橡胶的固化机理,选择具有增粘作用的水解型硅烷A151及过氧化物型硅烷VTPS作为氟硅橡胶的偶联剂;研究了A151及VTPS对氟硅橡胶粘接性能的影响,揭示了偶联机理,确定VTPS为氟硅橡胶的硅烷偶联剂;探讨了VTPS用量对氟硅橡胶粘接性能的影响。     

硅烷偶联剂的偶联作用机理及其在密封胶中的应用

硅烷偶联剂作为一种重要助剂,在密封胶、胶黏剂、金属防腐及涂料等领域都有广泛的应用。综述了硅烷偶联剂的偶联作用机理,包括化学键合理论、变形层及拘束层理论、摩擦层理论及应力松弛假说等。介绍了硅烷偶联剂在密封胶领域的几种典型应用方法,主要包括基材表面的底涂、填料颗粒的表面改性及作为助剂与基础聚合物共混等。讨论了不同使用条件下影响硅烷偶联剂使用效果的因素,并对硅烷偶联剂的发展进行了展望。     

The influence of aluminium surface pretreatment on the corrosion stability and adhesion of powder polyester coating

One of the most important factors in corrosion prevention by protective coatings is the coating adhesion loss under environmental influence. Thus, adhesion strength is often used when characterizing protective properties of organic coatings on a metal substrate. In order to improve the adhesion of organic coating the metal substrate is often pretreated in some way. In this work, the adhesion of polyester coatings on differently pretreated aluminium surface (by anodizing, with and without sealing, by phosphating and by silane film deposition) was examined. The dry and wet adhesion of polyester coatings were measured by a direct pull-off standardized procedure, as well as indirectly by NMP test. It was shown that under dry test conditions all polyester coatings showed very good adhesion, but that aluminium surface pretreated by silane film showed superior adhesion. The overall increase of wet adhesion for polyester coating on aluminium pretreated by silane film was maintained throughout the whole investigated time period. The different trends in the change of adhesion of polyester coatings were observed for different aluminium pretreatments during exposure to the corrosive agent (3% NaCl solution). The highest adhesion reduction was obtained for polyester coating on aluminium pretreated with phosphate coating. The corrosion stability of polyester coated aluminium was investigated by electrochemical impedance spectroscopy in 3% NaCl solution. The results confirmed good protective properties of polyester coating on aluminium pretreated with silane film, i.e. greater values of pore resistance and smaller values of coating capacitance were obtained in respect to other protective systems, whereas charge-transfer resistance and double-layer capacitance were not measurable during 2 months of exposure to a corrosive agent.     

偶联剂与等离子体协同表面处理对聚乙烯木塑复合材胶接性能的影响

采用硅烷偶联剂涂覆与等离子体协同处理的方法,对聚乙烯木塑复合材料进行表面处理以改善其胶接性能。研究了硅烷偶联剂浓度、等离子体处理时间、等离子体喷头距试件的处理距离对胶接强度的影响,优化了协同处理工艺。利用接触角测试、红外光谱分析研究了协同表面处理前后材料的表面性质变化,并对胶接接头的耐水性能进行了测试。结果表明:利用偶联剂涂覆和等离子体的协同处理,可以既提高胶接强度,又改善胶接接头的耐水性能。协同处理受偶联剂涂覆和等离子体处理的工艺因素影响较大,选取的优选处理工艺为偶联剂浓度为5%、等离子体处理时间为30s、处理距离为30mm。     

空心玻璃微珠偶联化学镀银的研究

使用氨丙基三乙氧基硅烷偶联剂改性空心玻璃微珠表面,然后直接实施化学镀银,借助红外光谱、扫描电镜和X-射线衍射测试手段对偶联改性效果、镀层表面形貌和结构进行了表征.测试结果表明,与胶体钯活化法和硝酸银活化法化学镀银相比,空心玻璃微珠偶联表面改性直接化学镀银的镀层更为致密、均匀,银利用率高,导电性好,结合力强.     

粉煤灰基地聚合物无机涂料的制备与性能

以低钙型粉煤灰为主要原料,硅酸钠和氢氧化钠为复合碱激发剂,硅烷偶联剂(KH550)为增强材料,硅丙乳液为辅助成膜物质制备地聚合物无机涂料。研究了硅烷偶联剂掺量、反应温度以及水固比对地聚合物无机涂料的成膜性、耐水性和耐洗刷性等性能的影响,并通过XRD、FTIR、SEM、TG-DSC分析了无机涂料的微观结构及其耐高温性能。结果表明,当制备温度为60 ℃、水固比为0.31(质量比)、硅烷偶联剂掺量为3.6%(质量分数)时,地聚合物无机涂料在室温下的成膜性良好,无开裂现象,涂料24 h内质量吸水率为1.84%,耐洗刷性可达12 000次,7 d时硬度为154 s。地聚合物无机涂层内部主要是无定形的硅铝酸盐凝胶,硅烷偶联剂经水解、键合生成簇状产物填充在涂层的孔隙之间,增加了涂层的密实性,抑制了裂纹的产生。涂层在25~800 ℃的失重率为12.0%~13.0%,未发现明显的地聚合物热分解现象,说明涂层耐高温性能良好。     

Adhesion of carbon steel and natural rubber by functionalized silane coupling agents

This study characterized a method of adhesion between uncured natural rubber and carbon steels (CS) by the surface modification of the CS with silane coupling agents comprising amino, thiol, glycidoxy, and isocyanate organic functionality. The effects of the functionalization of the silane coupling agents on adhesion between CS and uncured natural rubber were investigated by X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, atomic force microscopy, and local nanoscale thermal analysis. The reaction mechanism among the CS, silane coupling agent, and natural rubber was studied, revealing that adhesion was optimized and cohesive failure achieved when 3-(trimethoxysilyl)propylamine (APS) was used to modify the CS. The CS was shown to be directly silanized by the silane coupling agents, but the reactions between the natural rubber and the silane coupling agents was dependent on silane functionality.     

Metal–thermoplastic urethane hybrids in environmental exposure

The long-term properties of injection moulded metal–thermoplastic urethane (TPU) hybrids were studied. The hybrids manufactured with different metal substrates, namely copper, stainless steel and aluminium, were compared, using two surface modifications for copper and stainless steel. N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane was used as coupling agent. It is concluded that the bond mechanism of the silane on different substrate differs, affecting the long-term behaviour of the respective hybrids. The thick layers of silane coupling agent on copper and stainless steel are sensitive to hydrolysis; thus the resistance in humid conditions is quite low. The high temperature exposure increased the bond strength and the fraction of cohesive failure in TPU in copper–TPU, aluminium–TPU and polished steel–TPU hybrids. The last one has native mixed oxide, contrary to controlled oxidised stainless steel, where adhesion decreased after any long-term experiments. This is suggested to derive from hydrogen bonding of the coupling agent to the surface Fe₂O₃ oxide.