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以磷酸和氢氧化铝为原料在90~100℃合成二聚磷酸三氢铝,将硅酸钠,草酸按一定比例加入到二聚磷酸三氢铝溶液中制备成粘度为0.16~0.2Pa.s的涂液。用浸渍提拉法在清洗过的电工钢表面涂覆,自然干燥12h后,经退火炉在600℃热处理1min得到耐高温绝缘涂层。用X射线衍射分析(XRD)、差热分析(DTA)、热重分析(TG)及显微镜研究了涂层组成变化。用Franklin烧损试验表征了涂层的绝缘能力。结果表明,磷酸和氢氧化铝比例为3.3∶1时生成二聚磷酸三氢铝产率最高,性能最稳定。硅酸钠的加入既可以加强涂层的结合力又可以改善涂液的分散性。螯合剂的加入使涂料稳定存放。涂层在300℃稳定使用。最高使用温度可达600℃。 相似文献
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经对环氧磁漆的绝缘性分析和检测,以体积电阻率来解释和评价环氧涂料的绝缘性能,用试验检测对比了普通环氧涂料与绝缘环氧涂料在绝缘性能上存在的差异。普通环氧涂料的绝缘性能有时候是不能完全满意的,在一定条件下会有一定的"带电",使用上应根据绝缘要求和使用环境来选择。 相似文献
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针对超过800℃条件下使用的高温隔热涂料,从涂料的填料入手并利用聚氨酯泡沫塑料作辅助隔热层,使其保温隔热性能得到改进和提高,在一定条件下满足因产品升级而对保温隔热性能提高的要求,通过中空填料的运用和高温隔热涂料+聚氨酯泡沫塑料的复合隔热涂层,提高了耐高温隔热涂料的保温隔热性能,延长保温隔热涂料的有效隔热时间。 相似文献
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电熔镁砂作为高导热、耐高温的绝缘材料,在潮湿的空气中易水化变质而失去绝缘性。采用涂层法,以电熔镁砂、硝酸铝、三聚氰胺为原材料,在通氮气、1 250 ℃条件下,对电熔镁砂颗粒进行包覆。采用扫描电子显微镜(SEM)观察电熔镁砂颗粒表面已形成涂层,通过X射线衍射仪(XRD)分析表明包覆层为镁铝尖晶石,且无氮化镁、氮化铝、氮化碳。经过孔隙比表面积分析仪分析,完全包覆的电熔镁砂颗粒比表面积与之前相比有所增大。采用真空吸水干燥法检验吸水性能,检验结果显示,经过包覆的电熔镁砂颗粒吸水率降低了92.97%,最低吸水率达到0.167 2%。实验循环7次,吸水率仍能达到0.17%以下,该项研究为电熔镁砂防水技术提供了一条新途径。 相似文献
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探讨了耐高温隔热涂料的隔热性与涂层厚度的相关性,利用相关性指导选择适宜的涂层厚度,达到保温隔热的目的。 相似文献
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蔡继权 《精细与专用化学品》2010,18(11):6-10
在当今世界倡导节能减排和生态绿色的潮流中,隔热材料正由工业隔热保温为主向建筑隔热保温为主转变。上海世博会已经展示出建筑隔热保温在提高建筑物居住和使用功能、节约能源方面的成就,应该更加重视研发与推广应用建筑隔热保温涂料。本文介绍了杭州传化涂料有限公司研制的超薄节能型外墙隔热涂料的制造,讨论了材料的选择与优化。应用实验结果表明其隔热效果优于进口的同类产品。 相似文献
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The design of environment-friendly fireproof rigid polyurethane foams (RPUFs) that completely prevent ignition or the spread of fires is important for energy conservation and emission reductions. In this paper, an intumescent flame-retardant coating was prepared and coated onto the surface of a RPUF to improve its flame retardancy. Vertical combustion experiments (UL-94) showed that, compared with the pure RPUF, a RPUF coated with the expansion coating successfully self-extinguished without a droplet formed after ignitor removal. Thermogravimetric analyses showed that the expanded coating effectively increased the rate of carbon residue formation. Cone calorimetry showed that when the pigment-to-binder ratio was 3.5:1, with 5% modified montmorillonite, 6% aluminum hydroxide, and 4% titanium dioxide, the intumescent coating effectively reduced the heat release rate and total heat release of the RPUF. Remarkably, the smoke release rate and total exhaust gas volume showed that the expanded coating provided obviously enhanced smoke suppression. Therefore, the flame retardancy and toxic smoke suppression provided by the RPUF thermal insulation material is essential and very useful for healthy development of human society and the environment. 相似文献
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《Ceramics International》2023,49(20):33123-33134
Carbon nanotubes (CNTs) for temperature regulation have been proven to be promising for passive radiative heat dissipation. However, it remains a considerable challenge to assemble a CNTs layer in situ while simultaneously achieving horizontal electrical conductivity, vertical electrical insulation, and radiative heat dissipation. Herein, plasma pretreatment was employed to functionalize CNTs in an aqueous solution, thus improving their dispersion capability. Subsequently, a liquid-plasma-assisted particle deposition and sintering (LPDS) technology was proposed to prepare a dual-layer coating with an Al2O3-P2O5-SiO2-In2O3 glass system embedded with crystalline indium tin oxide (ITO) as the porous bottom layer and ITO-CNTs as the top layer on the aluminum alloy surface. The results show that plasma pretreatment significantly increases the deposition amount of ITO nanoparticles and functionalized CNTs on the coating surface, resulting in the transition from a single-layer composite coating to a dual-layer coating. The surface micro-/nano hierarchical structure favors strong absorptance/emittance, exhibiting a high infrared emittance of 0.94 (3-20 μm) and high solar absorptance of 0.92 (0.2-2.5 μm). Meanwhile, the surface balance temperature of the dual-layer coating is about 392 K, which is 146 K lower than that of aluminum alloy. Furthermore, the top conductive ITO-CNTs layer contributes to the low surface resistivity of 3.46×102 Ω, while the glass phase of the bottom layer ensures vertical electrical insulation with a volume resistance of 4.20×107 Ω. The process provides a new path for preparing thermal control coatings with anti-static function. 相似文献
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介绍了保温隔热涂料的种类,分析了保温隔热机理,指出适应外墙外保温体系的保温隔热饰面涂料是未来保温隔热涂料的发展方向。 相似文献