Patent
Preparation of sisal fiber porous material capable of improving high, medium and low frequency sound absorption performance
Wang Ting,Ge Heyi,Huang Zhen +2 more
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TLDR
In this article, a preparation method of a sisal fiber porous material capable of improving high, medium and low frequency sound absorption performance is described. But the method is characterized by comprising steps as follows: natural sisal fibers are selected and treated with sodium hydroxide and hydrogen peroxide, so that surfaces of the fibers are swollen and loose, sub-fibers in dozens of or hundreds of micron size are produced, the fiber are bonded with a polyurethane adhesive, and a sound absorption fiber composite material is prepared.Abstract:
The invention relates to a preparation method of a sisal fiber porous material capable of improving high, medium and low frequency sound absorption performance. The preparation method is characterized by comprising steps as follows: natural sisal fibers are selected and treated with sodium hydroxide and hydrogen peroxide, so that surfaces of the fibers are swollen and loose, sub-fibers in dozens of or hundreds of micron size are produced, the fibers are bonded with a polyurethane adhesive, and a sound absorption fiber composite material is prepared. The sound absorption material adopts a simple preparation method, is environment-friendly, low in cost and wide in source, and has outstanding medium and low frequency sound absorption performance.read more
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Patent
Sound absorbing polyimide foam material and preparation method thereof
Zheng Yiliang,Huang Zhicheng +1 more
TL;DR: In this article, a sound absorbing polyimide foam material and a preparation method consisting of pouring isocyanate into an A tank, dissolving aromatic dianhydridein a solvent, performing cooling to obtain a solution, adding a foaming agent and a foam stabilizer to the solution, stirring the solution uniformly, and then pouring the solution into a B tank; uniformly stirring sound absorbing materials and a catalyst, and pouring the sound absorbing material and the catalyst into a C tank; stirring the A, B, and C tanks respectively, and removing air in raw materials
Patent
Method for preparing modified sisal fibers
TL;DR: In this article, a method for preparing modified sisal fibers is described, in which the modified sisalfibers have smooth surfaces, are polymerized on the surfaces by the L-lactide monomers to enhance the interfacial compatibility between the sisal fiber and a polylactic acid matrix material, and have good performance.