废弃秸秆/聚己内酯吸声复合材料的制备与性能

doi:10.13475/j.fzxb.20210901708

摘要/Abstract

摘要：

为提高废弃秸秆的利用率,拓宽其应用领域,以废弃秸秆为增强原料,聚己内酯为基体材料,通过热压法制备废弃秸秆/聚己内酯吸声复合材料。在热压温度为120 ℃,压力为10 MPa,热压时间为20 min的条件下,通过实验探究秸秆质量分数、复合材料密度、复合材料厚度、后置空气层厚度等参数对吸声复合材料吸声性能的影响。结果表明:当秸秆质量分数为30%、复合材料密度为0.450 g/cm³、复合材料厚度为1.5 cm、后置空气层厚度为3.0 cm时,废弃秸秆/聚己内酯吸声复合材料在100~6 300 Hz频率内吸声性能优异,其平均吸声系数为0.50,降噪系数为0.50,最大吸声系数为0.71,吸声性能等级达到Ⅲ级,吸声机制是多孔吸声原理。

关键词: 废弃秸秆, 聚己内酯, 吸声性能, 复合材料, 吸声机制

Abstract:

In order to improve the utilization rate of waste straws and broaden its application field, waste straw/polycaprolactone sound absorption composites were prepared by hot pressing with waste straw as reinforcement material and polycaprolactone as matrix material. Under the hot pressing temperature of 120 ℃, pressure of 10 MPa and hot pressing time of 20 min, the influences of straw mass fraction, composite density, composite thickness and thickness of rear air layer on sound absorption performance of the composite were investigated by experiment. The results shows that when the straw mass fraction was 30%, the composite density was 0.450 g/cm³, the composite thickness was 1.5 cm, and the thickness of the rear air layer was 3.0 cm, the waste straw/polycaprolactone sound absorption composite demonstrates excellent sound absorption performance for 100-6 300 Hz frequency, with the average sound absorption coefficient of 0.50, the noise reduction coefficient of 0.50, and the maximum sound absorption coefficient 0.71, which indicate grade Ⅲ of sound absorption performance. The research revealed that the sound absorption mechanism is based on porous structure of the composites.

Key words: waste straw, polycaprolactone, sound absorption performance, composite material, sound absorption mechanism

中图分类号:

TS102.9

吕丽华, 李臻, 张多多. 废弃秸秆/聚己内酯吸声复合材料的制备与性能[J]. 纺织学报, 2022, 43(01): 28-35.

LÜ Lihua, LI Zhen, ZHANG Duoduo. Preparation and properties of sound absorbing composites based on use of waste straw/polycaprolactone[J]. Journal of Textile Research, 2022, 43(01): 28-35.

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秸秆质量分数/%	复合材料密度/ ( g·cm^-3)	复合材料厚度/cm	后置空气层厚度/cm
30	0.450	1.0	0.0
40	0.500	1.5	1.0
50	0.550	2.0	2.0
60	0.600	2.5	3.0

降噪系数NRC	吸声性能等级
[0.8,+∞)	Ⅰ
[0.6,0.8)	Ⅱ
[0.4,0.6)	Ⅲ
[0.2,0.4)	Ⅳ