以纤维素纳米纤维(CNF)为原料合成了纤维素凝胶,将纤维素凝胶平铺在涤棉织物上,低温冷冻再高温干燥得到纤维素气凝胶复合涤棉的隔热材料。采用溶胶-凝胶法合成了低发射率掺杂铝、镧的氧化锌粉末[ZnO∶(Al,La)],球磨后制成涂料,粘附在纤维素气凝胶/涤棉表面形成涂层,得到了低发射率兼具隔热性能的红外隐身复合材料ZnO∶(Al,La)/纤维素气凝胶/涤棉。通过IR-2双波段发射率测试仪研究了不同ZnO∶(Al,La)涂层厚度对复合材料发射率的影响,通过红外热像仪对复合材料的持续隐身性能进行了表征。结果表明:当涂层厚度为400μm时,发射率最低为0.673;纤维素气凝胶厚度为4mm的复合材料可维持90min的红外隐身效果,在红外隐身领域具有广阔的应用前景。
Cellulose gel was synthesized with cellulose nanofibers (CNF),and the cellulose gel was spread on the polyester cotton fabric,frozen at low temperature and then dried at high temperature to obtain the thermal insulation composite material of cellulose aerogel/polyester cotton.Low emissivity zinc oxide powder doped with aluminum and lanthanum [ZnO∶(Al,La)] was prepared by sol-gel method.The ZnO∶(Al,La) powder was then ground by ball milling and adhered to the surface of the cellulose aerogel/polyester cotton to obtain an infrared stealth composite material ZnO∶(Al,La)/cellulose aerogel/polyester cotton with low emissivity and heat insulation properties.The effect of different ZnO∶(Al,La) coating thickness on the emissivity was investigated by IR-2 dual-band emissivity tester,and the continuous stealth performance of the composites was characterized by infrared thermography.The results showed that,when the coating thickness was 400μm,the lowest emissivity was 0.673.The composite with cellulose aerogel thickness of 4mm could maintain the infrared stealth effect for 90 minutes,which had broad application prospect in the field of infrared stealth.
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基金资助
国家自然科学基金(21872025)
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