Preparation of Hu sheep wool/polyacrylonitrile oxidized fiber flame retardant and sound absorption material

The breeding scale of Hu sheep continues to expand in China. However, due to the low quality of Hu sheep wool and unsuitable for spinning medium and high-grade wool yarn, the purchase price of Hu sheep wool is low and even it is directly discarded. In order to protect the natural resources from being wasted and improve the added value of Hu sheep, the aim of this paper is to develop a needling sound absorption material using Hu sheep wool. The preparation method of mixing polyacrylonitrile oxidized fiber (PANOF) into Hu sheep wool is used, so as to improve the flame retardance of sound absorbing materials. The two fibers are intertwined to form complex channels by needling and milling process, which is advantageous for being a good sound absorbing material. In order to explore the influence of the blending ratio and mixing methods on the sound absorption and flame retardance, the thickness of needled fabrics is set as about 4.8 mm and the surface density is set as about 440 g/m ² in this paper. The results show that the blending ratio of Hu sheep wool/PANOF is 80/20, the sound absorption coefficient is greater than 50% in the middle and high frequency and high frequency. It is a high-efficiency sound absorption material, and its flame retardant performance meets the standard requirements. This research provides an effective way for the use of Hu sheep wool.