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利用铝酸酯偶联剂X-30制备超疏水纳米二氧化硅粒子 总被引:1,自引:0,他引:1
以甲苯为溶剂用自制的廉价铝酸酯偶联剂X-30改性纳米二氧化硅,然后构造一个具有微纳米结构的二氧化硅表面使其达到超疏水效果.用傅里叶红外光谱(FT-IR)、X射线衍射光谱(XRD)、扫描电镜(SEM)、表面水接触角测量(WCA)对改性后的纳米二氧化硅进行分析,并探讨其最佳工艺条件.研究结果表明:该方法得到的纳米二氧化硅表面成功地被偶联剂包覆,其表面水接触角为150.1°,达到超疏水效果. 相似文献
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采用油酸对纳米TiO2粒子进行表面改性,并用红外光谱、接触角测定仪、扫描电镜、X-射线衍射及热重分析对改性效果进行表征.实验结果表明,改性后的TiO2粒子疏水性增强,团聚现象明显减少.说明通过油酸改性,提高了无机纳米TiO2粒子在有机物中的分散性,为其参加原位乳液聚合创造了条件.随后用改性后的纳米TiO2与丙烯酸酯单体... 相似文献
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为了评价船舶防污涂料的抗菌性能和抗硅藻附着性能,采用超景深显微镜、接触角测量仪对防污涂层表面形貌、水接触角进行测量,并采用GB/T 21866—2008《抗菌涂料抗菌性测定法和抗菌效果》对抗菌性进行测试,设计静态防污实验对涂层抗硅藻附着性能进行测试,建立有效的实验室测试评价方法。测试结果表明,选用的防污涂料均具有良好的抗菌性,但是在抗硅藻附着性能上差异化明显,对于低表面能防污涂料,在实验室静态条件下没有抗硅藻附着能力,需要静态实验与动态实验相结合,才能准确评价此类防污涂料的防污性能。 相似文献
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无溶剂超厚膜环氧涂层海洋腐蚀模拟试验研究 总被引:1,自引:0,他引:1
超厚膜重防腐涂料具有优异的防腐性能以及环境友好的特点,是海洋环境防腐涂料的重要发展方向。文中介绍了一种新型的无溶剂超厚膜环氧重防腐涂料,测试了涂层的物理性能,并采用海洋腐蚀模拟试验装置对该涂料以及常用的三种重防腐涂料在海水浪花飞溅区、潮差区和全浸区的耐久性进行了对比研究。结果表明:该涂料具有优异的物理性能,VOC含量极低,是环境友好型无溶剂涂料;模拟试验表明浪花飞溅区是海洋腐蚀最严酷的区域,各涂料在该区域腐蚀最严重,超厚膜环氧重防腐涂料的防腐效果最优,是环氧沥青涂料的理想替代品。 相似文献
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根据波导有限元-传递矩阵法建立了背衬条件下的多层材料吸声覆盖层的理论模型并与仿真软件COMSOL建立的有限元模型对比证明模型有效。在COMSOL模型的基础上讨论了单层壳体背衬和双层壳体背衬条件下的覆盖层的吸声性能并比较了在双层壳体背衬条件下不同空腔结构的吸声性能。结果表明:单层壳体背衬条件下,随着钢背衬厚度增大,吸声波峰向低频移动但峰值变小;两层壳体的水层厚度增大,波峰向低频移动,波峰渐渐增多,峰值减小;在非耐压壳体厚度增大时,三种厚度情况下的吸声系数曲线大致相同说明外壳厚度对于吸声系数的影响很小;圆柱型空腔在低频表现稍好一些,而椭球型空腔在整体表现均好于其余两种情况。 相似文献
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应用非刚性表面声散射的物理声学方法,发展了基于射线跟踪技术的浅海波导中覆盖消声层目标回声计算的数值方法。选取Benchmark潜艇模型和两种假想的消声覆盖层(反射系数在垂直入射时相同,随角度增加的速率不同),讨论了自由空间和浅海信道中弱正梯度和负梯度两种典型声速剖面条件下刚性及覆盖消声层目标的回声特性。结果指出:由于自由空间和浅海波导中目标回声形成机理不同,这两种覆盖层对自由空间中的消声作用影响较小,对浅海波导中的消声作用影响较大;自由空间中消声覆盖层的消声作用不能完全反映其在浅海波导中的实际效果;在实际浅海波导中为了获得较好的消声作用,不仅要在0度入射角还应在小角度(0-30度左右)范围内将覆盖层的反射系数控制在较小的数值区间。 相似文献
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The present paper investigated and analyzed swirler material consisting of mild steel which was subjected to service for the period of one year in a 30 MW marine boiler. Due to the presence of high temperatures in the furnace coupled with the corrosive marine environment swirler material showed accelerated degradation and material wastage. An investigation into the feasibility of manufacturing the existing swirler with an alternate material or coating the swirler material with a thermal barrier coating was undertaken. Based on their properties and performance, SS 304 and SS 316 were proposed as the replacement materials for the swirler. The other alternative of coating the existing swirlers with a form thermal barrier coating to observe for any improvement in their performance at elevated temperatures was also tested. Stellite, which is a Ni-Co based coating, was carried out on the MS samples and the same were exposed to same temperatures mentioned above. The performance of the available options was evaluated with respect to the grain structure of the material, the hardness value of the materials and deterioration at elevated temperatures. Investigation showed the proposed materials/coatings like SS 304, SS 316 and Stellite coating revealed that SS 316 is the material best suited for high temperature application. 相似文献
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《船舶与海洋工程学报》2016,(1)
The present paper investigated and analyzed swirler material consisting of mild steel which was subjected to service for the period of one year in a 30 MW marine boiler. Due to the presence of high temperatures in the furnace coupled with the corrosive marine environment swirler material showed accelerated degradation and material wastage. An investigation into the feasibility of manufacturing the existing swirler with an alternate material or coating the swirler material with a thermal barrier coating was undertaken. Based on their properties and performance, SS 304 and SS 316 were proposed as the replacement materials for the swirler. The other alternative of coating the existing swirlers with a form thermal barrier coating to observe for any improvement in their performance at elevated temperatures was also tested. Stellite, which is a Ni-Co based coating, was carried out on the MS samples and the same were exposed to same temperatures mentioned above. The performance of the available options was evaluated with respect to the grain structure of the material, the hardness value of the materials and deterioration at elevated temperatures. Investigation showed the proposed materials/ coatings like SS 304, SS 316 and Stellite coating revealed that SS 316 is the material best suited for high temperature application. 相似文献
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考虑到目前国内外还没有经过广泛认可的、统一的针对PSPC涂层性能新标准的具体操作指南或指引,相关条款还存在争议,结合PSPC涂层新标准的具体内容和船企实践,对PSPC适用对象、涂层系统的要求、压载舱的涂装施工程序及检验等进行阐述,以期为船舶企业实施PSPC提供参考,为原油轮货油舱新标准COTPSPC的执行提供借鉴。 相似文献
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铝粉是一种用途极广的添加剂,在高温高湿的环境下极易氧化。如果不经过钝化处理,则会严重影响烟火药的性能,所以在实际的生产和研究中,对铝粉进行钝化处理是必要和非常重要的。本文通过固相包覆法,使用硬脂酸作为钝化剂,对铝粉进行物理包覆,并对其前后的性能(抗氧化性)进行了测试。结果表明,随着硬脂酸含量的增加,钝化铝粉的抗氧化性呈增强的趋势,结合在发光信号剂中性能情况,当铝粉钝化处理中硬脂酸含量为5%时,达到最理想的包覆效果,硬脂酸含量的增加不能达到更好地包覆效果。 相似文献