Abstract
In order to improve the utilization rate of kapok fiber, flame-retardant and sound-absorption composites were prepared by the hot pressing method with kapok fiber as the reinforced material, polyε-caprolactone as the matrix material, and magnesium hydroxide as the flame retardant. Then, the effects of hot pressing temperature, hot pressing time, density of composites, mass fraction of kapok fiber, thickness of composites, and air layer thickness on the sound-absorption properties of composites were analyzed, with the average sound absorption coefficient as the index. Under the optimal process parameters, the maximum sound absorption coefficient reached 0.830, the average sound absorption coefficient was 0.520, and the sound-absorption band was wide. Thus, the composites belonged to high-efficiency sound-absorbing material. The flame-retardant effect of magnesium hydroxide on the composites was investigated, and the limiting oxygen index could reach 31.5%. Finally, multifunctional composites based on kapok fiber with flame retardant properties, and sound-absorption properties were obtained.
Highlights
As the world becomes more scientific and technological and the population grows, the distance between people is getting closer and closer, and the need to reduce and control noise has become more and more important
The results showed that the sound-absorption properties at low frequency could be improved by increasing the thickness of the rear air layer
When we studied the influence of the thickness of air layer on the sound-absorption properties, the air layer with different thicknesses was arranged behind the sample
Summary
As the world becomes more scientific and technological and the population grows, the distance between people is getting closer and closer, and the need to reduce and control noise has become more and more important. Kapok fiber is a natural fiber, which has the advantages of softness, high hollow ratio, antibacterial, and mite removal, etc. It has received extensive attention and has good development prospect in the application of the textile field [2]. Kapok fiber has obvious disadvantages such as short length, poor strength, weak elasticity, and poor cohesion. Due to these shortcomings, kapok fiber cannot be spun alone, resulting in poor application in the field of clothing. Through processing, kapok fiber sound-absorbing materials can be developed
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