A kind of preparation method of porous sound-absorbing structure composite material

Abstract

The invention discloses a preparation method of a porous sound absorption structure composite material. The method comprises the following steps: stacking 3-5 layers of pre-woven high-performance fiber cloth, printing 10-40 parallel three-dimensional straight pipelines on the high-performance fiber cloth by wax materials, PLA (polylactic acid) environment-friendly materials and the like through a 3D printer respectively in the middle of each layer, wherein the pipelines between the two adjacent layers are spatially orthogonal, the diameter of each pipeline is 1 mm to 3 mm, and the distance between the central lines of the two adjacent layers of prefabricated pipelines is 2 mm to 4 mm; injecting epoxy resin, forming by a molding process, and heating in a drying oven at 40-200 DEG C until the 3D pipeline printing materials are fully volatilized or molten to obtain the porous sound absorption structure composite material. The 3D printer used in the preparation process of the porous sound absorption structure composite material is high in printing speed and precision and stable in performance, the printing materials easily volatilized or molten when being heated are used, a preparation process of through holes is greatly simplified, and the price of the printing materials is low; the prepared porous sound absorption structure composite material integrates structural material and sound absorption performances, and is simple in construction process, low in cost and excellent in performances such as good sound absorption effect, corrosion resistance, environmental protection, light weight, high strength and high product size stability.

Description

technical field [0001] The invention relates to a preparation method of a composite material, in particular to a preparation method of a porous sound-absorbing structure composite material. Background technique [0002] With the development of science and technology and modern industry, noise pollution has become a worldwide problem. At the same time, with the enhancement of environmental awareness, people's requirements for the sound environment are getting higher and higher. Sound absorption and noise reduction has gradually evolved into an important issue that needs to be solved in the coordinated development of high technology, the environment, and human beings, such as the absorption and isolation of noise and vibration generated by high-speed trains, especially the "hidden sound" technology of submarines. Submarines are characterized by concealment and surprise attack. In the era of highly developed modern anti-submarine technology, whether a submarine has good stealt...

AI Technical Summary

Problems solved by technology

The sound-absorbing materials mentioned in the above-mentioned patents all use the sound-absorbing properties of porous materials. They are only used as a single sound-absorbing layer. In actual use, they need to rely on structural materials to carry external forces, and the phenomenon of peeling and failure of the sound-absorbing layer is prone to occur. And the high cost due to the increased process links; on the other hand, most of the existing porous materials are metal foam, foam glass, foam plastic, etc. After foaming treatment, a large number of bubbles are formed inside the material, the size of the pores, The quantity and arrangement cannot be well controlled, which leads to the instability of the sound absorption performance of the material; the preparation of foamed metals such as foamed nickel has the disadvantages of complex process and difficult molding

Images