张伟钢,郑梦影,吕丹丹.超疏水低红外发射率复合涂层的制备及性能表征[J].表面技术,2020,49(7):105-111.
ZHANG Wei-gang,ZHENG Meng-ying,LYU Dan-dan.Preparation and Performance Characterization of Superhydrophobic Low Infrared Emissivity Composite Coating[J].Surface Technology,2020,49(7):105-111 |
| 超疏水低红外发射率复合涂层的制备及性能表征 |
| Preparation and Performance Characterization of Superhydrophobic Low Infrared Emissivity Composite Coating |
| 投稿时间：2019-11-20 修订日期：2020-07-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2020.07.013 |
| 中文关键词: 复合涂层 纳米SiO2 红外发射率 光泽度 水接触角 |
| 英文关键词:composite coating nano-SiO2 infrared emissivity glossiness water contact angle |
| 基金项目:国家自然科学基金项目（61705029）；安徽省自然科学基金项目（1808085MF187）；滁州学院大学生创新训练计划项目（2019CXXL122） |
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| 中文摘要: |
| 目的 制备得到具有超疏水特性的低红外发射率涂层。方法 以纳米SiO2为微纳结构改性剂，聚二甲基硅氧烷（PDMS）为树脂基体，Al粉为功能颜料，采用刮涂法制备得到了多种类型的改性和非改性PDMS/Al复合涂层。分析探讨了PDMS和Al粉配比、纳米SiO2添加量及表面微纳结构层对涂层性能的影响规律及成因。结果 PDMS和Al粉配比对涂层发射率和光泽度影响明显，当PDMS和Al粉配比为6∶4时，涂层的发射率和光泽度可分别低至0.265和10.3，涂层的水接触角可达到109.5°，要明显高于传统树脂基低发射率涂层。添加纳米SiO2可使涂层的粗糙度上升明显，从而使涂层的疏水性显著增强。当纳米SiO2质量分数为8%时，涂层的水接触角可增大到130°，涂层的发射率和光泽度仍可低至0.330和9.8。PDMS/SiO2微纳结构层可在PDMS/Al复合涂层表面形成明显的乳突状微纳结构，从而使涂层实现超疏水特性。当PDMS和纳米SiO2配比为7∶3时，改性后的涂层水接触角可高达156°，同时具有相对较低的发射率（0.661）和极低的光泽度（2.1）。结论 在PDMS/Al复合涂层表面构筑一定厚度的微纳结构层，可实现该涂层超疏水、低发射率和低光泽的兼容。 |
| 英文摘要: |
| The work aims to prepare a low infrared emissivity coating with superhydrophobic property. Various types of modified and unmodified polydimethylsiloxane (PDMS)/Al composite coatings were prepared by scratch coating method with nano-SiO2 as micro-nano structural modifier, PDMS as resin matrix and Al powders as functional pigments, respectively. The effects and causes of the ratio of PDMS to Al powders, the addition amount of nano-SiO2 and the surface micro-nano structural layer on the coating properties were discussed. The ratio of PDMS and Al powder had a significant effect on the emissivity and glossiness of the coating. When the ratio of PDMS to Al powders was 6∶4, the emissivity and glossiness of the coating could be as low as 0.265 and 10.3, respectively. The water contact angle could reach 109.5°, which was significantly higher than that of conventional resin-based low emissivity coating. Adding nano-SiO2 could significantly increase the roughness of the coating, thereby significantly enhancing the hydrophobicity of the coating. When the amount of nano-SiO2 was 8%, the water contact angle of the coating increased to 130° and the emissivity and glossiness of the coating could still be as low as 0.330 and 9.8. The PDMS/SiO2 micro-nano structural layer formed a distinct papillary micro-nano structure on the surface of the PDMS/Al composite coating, so that the coating achieved superhydrophobic property. When the ratio of PDMS to nano-SiO2 was 7∶3, the water contact angle of the modified coating could be as high as 156°, and the coating had a relatively low emissivity (0.661) and extremely low glossiness (2.1) performance. The compatibility of superhydrophobic property, low emissivity and low glossiness of the PDMS/Al composite coating can be achieved by constructing a micro-nano structural layer with a certain thickness on the surface of the coating. |
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