Study on sound absorption and dynamic mechanical properties of polyurethane foaming materials filled with hollow glass beads

doi:10.19491/j.issn.1001-9278.2023.01.007

Abstract

Abstract:

A series of soft polyurethane （PU）/tricresyl phosphate （TCP）， PU/TCP/hollow glass beads （HGB）， PU/TCP/HGB/azodicarbonamide （AC） composites were prepared by melt blending method using TCP as a plasticizer， HGB as a filler， and AC as a foaming agent. The effects of the contents of TCP， HGB and AC foaming agent on the sound absorption and dynamic mechanical properties of PU composite materials were investigated. The results indicated that the addition of TCP， HGB， and AC foaming agent enhanced the sound absorption properties of the composites significantly. The composites obtained optimal performance at a TCP mass fraction of 25 wt%， a HGB mass fraction of 10 wt%， and an AC mass fraction of 2 wt%. Their average sound absorption coefficient and maximum sound absorption coefficient reached 0.29 and 0.55， respectively， at a frequency of 1 714 Hz. Based on the half⁃peak width of sound absorption frequency， the addition of TCP was found to reduce the length of half peak width of the composites with an increase in the amounts of HGB and AC foaming agent. Through analyzing the dynamic mechanical properties of PU/TCP， PU/TCP/HGB composites， the rationality of the addition of 25 wt% TCP and 10 wt% HGB in the composites was verified.

Key words: hollow glass bead, sound absorption coefficient, half peak width, polyurethane, dynamic mechanical property

CLC Number:

TQ323.8

ZHANG Weicheng, HU Xiang, LUO Hongxing, JIN Hui, YOU Feng, JIANG Xueliang, YAO Chu. Study on sound absorption and dynamic mechanical properties of polyurethane foaming materials filled with hollow glass beads[J]. China Plastics, 2023, 37(1): 38-45.

Figures/Tables 8

Fig.1. Effect of TCP content on sound absorption coefficient of PU/TCP composites

Fig.2. Effect of HGB content on sound absorption coefficient of PU/TCP/HGB composites

Fig.3. Effect of AC content on sound absorption coefficient of PU/TCP/HGB/AC composites

Fig.4. SEM of PU/TCP/HGB/AC composites with different content of AC foaming agent

AC含量/ %	开孔体积/cm³	开孔率/%
1	0.359	33.782
2	0.569	53.565
3	0.678	63.744

Tab.1. Effects of different content of AC foaming agent of the porosity of PU/TCP/HGB/AC composites

TCP含量/%	HGB含量/%	AC含量/%	半峰宽/Hz
0	-	-	400
10	-	-	362
15	-	-	308
20	-	-	306
25	-	-	180
-	0	-	180
-	5	-	188
-	10	-	228
-	15	-	282
-	20	-	490
-	-	0	228
-	-	1	586
-	-	2	946
-	-	3	270

Tab.2. Effects of different content of TCP， HGB and AC foaming agent on the half peak width of sound absorption coefficient frequency of different composites

Fig.5. Effect of TCP content on dynamic mechanical properties of PU/TCP composites

Fig.6. Effect of HGB content on dynamic mechanical properties of PU/TCP/HGB composites

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