SiO2气凝胶/纤维复合材料的耐紫外老化性能研究

doi:10.19964/j.issn.1006-4990.2024-0466

Abstract

Abstract:

With tetraethoxysilane as silicon source，trimethylchlorosilane as hydrophobic modifier，basalt fiber，basalt fiber high silica fiber composite and high silica fiber as matrix materials，three kinds of SiO₂ aerogel composites were prepared by sol-gel method and supercritical drying technology，and the changes of microstructure and performance of aerogel composites under ultraviolet environment were explored.The results showed that before the ultraviolet aging test，the fiber as the framework of the composite was tightly wrapped by the aerogel，and the two formed a close combination.After the test，the basalt fiber/aerogel composites，basalt fiber high silica fiber/aerogel composites and high silica fiber/aerogel composites all had micro pit structures on their surfaces.A small number of fibers were separated from the aerogel，and the aerogel structure was also becoming loose.The mechanical properties were reduced by 9.8%，11.9%，and 9.1%，respectively，while the thermal conductivity was increased by 8.3%，8.5%，and 5.4%.Based on the theory of equivalent radiation，the prediction equation of UV aging life in natural environment was established.Taking the decline of mechanical properties below 10% as the failure threshold，the ultraviolet aging life in natural environment was predicted to be 10.0，10.8，and 10.9 a，respectively.The three aerogel composites showed the potential of long-term stable service in the ultraviolet radiation environment of bridges，and were expected to be used in the field of bridge fire prevention.

Key words: bridge fire protection, aerogel composites, ultraviolet aging, tensile strength, thermal insulation performance

CLC Number:

TQ127.2

KANG Zhuangsu, FAN Chuanbin, SHI Fangchang, CHEN Huanyong, YAO Zhian, JIA Shuaide, KANG Dawei, MIN Liang, LI Jia, MENG Qingkun, QI Jiqiu. Study on durability of silica aerogel/fiber composites under ultraviolet aging[J]. Inorganic Chemicals Industry, 2025, 57(9): 53-60.

Figures/Tables 10

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References 22

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类别	衰退率/%	A	B	C	实验室紫外老化寿命t/d	自然紫外老化寿命T/a
BF/AC	5	0	-13.306 3		45	2.8
	10			1 005.348	162	10.0
	15				279	17.0
BF- HSGF/AC	5	-2.209 9	0.517 4		120	7.4
	10			767.519	174	10.8
	15				216	13.3
HSGF/AC	5	-0.925 8	-7.956 0		114	7.0
	10			745.841	177	10.9
	15				231	14.2

类别	衰退率/%	A	B	C	实验室紫外老化寿命t/d	自然紫外老化寿命T/a
BF/AC	5	0	0.000 245		105	6.5
	10			0.019 33	222	14.0
	15				342	21.0
BF- HSGF/AC	5	0	0.000 283		54	3.3
	10			0.020 42	159	9.9
	15				264	16.3
HSGF/AC	5	0	0.000 171		165	10.2
	10			0.020 27	342	21.1
	15				519	32.0

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Inorganic Acid-Base-Salt Committee of CIESC

Study on durability of silica aerogel/fiber composites under ultraviolet aging

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