化工新型材料

化工新型材料 ›› 2025, Vol. 53 ›› Issue (12) : 173-178. DOI: 10.19817/j.cnki.issn1006-3536.2025.12.015

科学研究

改性SiO₂气凝胶隔热涂层的制备及其性能研究

^1,2*

作者信息 +

Preparation and properties study of modified SiO₂ aerogel thermal insulating coatings

Wei Wenhui¹, Gao Benzheng¹, Qi Duo^1,2, Wang Na^1,2

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文章历史 +

Received		Published
2024-12-11		2025-12-20
Issue Date	Revised Date
2025-12-17	2024-12-11

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摘要

SiO₂气凝胶是一种理想的隔热型功能填料,但是强疏水性限制了其在水性涂料中的应用。采用聚合物二次凝胶法,通过聚乙烯醇与琼脂糖对疏水型SiO₂气凝胶进行物理包覆,得到改性SiO₂气凝胶(CSA)。以CSA和空心玻璃微珠为阻隔型功能填料,TiO₂为反射型功能填料,制备了复合隔热涂层。采用傅里叶变换红外光谱仪、扫描电子显微镜和透射电子显微镜等对CSA的结构、微观形貌进行表征,研究了CSA的分散稳定性、导热性能以及复合隔热涂层的隔热性能。结果表明:聚合物二次凝胶包覆改性的方法显著提高了气凝胶的表面亲水性和分散性,制备的复合型隔热涂层与空白铝板的隔热温差可达18.5℃。

Abstract

SiO₂ aerogel is an ideal thermal insulation functional pigment.However,its strong hydrophobicity limits its application in waterborne coatings.A polymer secondary gelation method was employed to physically encapsulate hydrophobic SiO₂ aerogel with polyvinyl alcohol and agarose,thereby preparing modified SiO₂ aerogel (CSA).The composite thermal insulating coatings were prepared by using CSA and hollow glass beads as barrier-type functional pigments and TiO₂ as reflective-type functional pigment.Fourier transform infrared spectroscopy,scanning electron microscope and transmission electron microscope were used to characterize the structure and microscopic morphology of CSA.The dispersion stability and thermal conductivity of CSA,as well as the thermal insulation performance of the composite thermal insulation coating were studied.The results showed that the polymer secondary gelation coating modification method significantly improved the surface hydrophilicity and dispersibility of the aerogel.The temperature difference between the prepared composite thermal insulating coating and the blank aluminum plate reached 18.5℃.

关键词

SiO₂气凝胶 / 聚乙烯醇 / 琼脂糖 / 分散性 / 水性隔热涂层

Key words

SiO₂ aerogel / polyvinyl alcohol / agarose / dispersibility / waterborne thermal insulation coatings

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改性SiO₂气凝胶隔热涂层的制备及其性能研究[J]. 化工新型材料, 2025, 53(12): 173-178 DOI:10.19817/j.cnki.issn1006-3536.2025.12.015

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